blob: 4399f0c3a4ce1c6a08cfa81f2720f27a7138eea7 [file] [log] [blame]
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#include <linux/kernel.h>
20#include <linux/bio.h>
21#include <linux/buffer_head.h>
22#include <linux/file.h>
23#include <linux/fs.h>
Christoph Hellwigcb8e7092008-10-09 13:39:39 -040024#include <linux/fsnotify.h>
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040025#include <linux/pagemap.h>
26#include <linux/highmem.h>
27#include <linux/time.h>
28#include <linux/init.h>
29#include <linux/string.h>
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040030#include <linux/backing-dev.h>
Christoph Hellwigcb8e7092008-10-09 13:39:39 -040031#include <linux/mount.h>
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040032#include <linux/mpage.h>
Christoph Hellwigcb8e7092008-10-09 13:39:39 -040033#include <linux/namei.h>
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040034#include <linux/swap.h>
35#include <linux/writeback.h>
36#include <linux/statfs.h>
37#include <linux/compat.h>
38#include <linux/bit_spinlock.h>
Christoph Hellwigcb8e7092008-10-09 13:39:39 -040039#include <linux/security.h>
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040040#include <linux/xattr.h>
Yan Zheng7ea394f2008-08-05 13:05:02 -040041#include <linux/vmalloc.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090042#include <linux/slab.h>
Li Dongyangf7039b12011-03-24 10:24:28 +000043#include <linux/blkdev.h>
Alexander Block8ea05e32012-07-25 17:35:53 +020044#include <linux/uuid.h>
Filipe Brandenburger55e301f2013-01-29 06:04:50 +000045#include <linux/btrfs.h>
Mark Fasheh416161d2013-08-06 11:42:51 -070046#include <linux/uaccess.h>
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040047#include "ctree.h"
48#include "disk-io.h"
49#include "transaction.h"
50#include "btrfs_inode.h"
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040051#include "print-tree.h"
52#include "volumes.h"
Chris Mason925baed2008-06-25 16:01:30 -040053#include "locking.h"
Li Zefan581bb052011-04-20 10:06:11 +080054#include "inode-map.h"
Jan Schmidtd7728c92011-07-07 16:48:38 +020055#include "backref.h"
Josef Bacik606686e2012-06-04 14:03:51 -040056#include "rcu-string.h"
Alexander Block31db9f72012-07-25 23:19:24 +020057#include "send.h"
Stefan Behrens3f6bcfb2012-11-06 15:08:53 +010058#include "dev-replace.h"
Filipe David Borba Manana63541922014-01-07 11:47:46 +000059#include "props.h"
Jeff Mahoney3b02a682013-11-01 13:07:02 -040060#include "sysfs.h"
Josef Bacikfcebe452014-05-13 17:30:47 -070061#include "qgroup.h"
Christoph Hellwigf46b5a62008-06-11 21:53:53 -040062
Hugo Millsabccd002014-01-30 20:17:00 +000063#ifdef CONFIG_64BIT
64/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
65 * structures are incorrect, as the timespec structure from userspace
66 * is 4 bytes too small. We define these alternatives here to teach
67 * the kernel about the 32-bit struct packing.
68 */
69struct btrfs_ioctl_timespec_32 {
70 __u64 sec;
71 __u32 nsec;
72} __attribute__ ((__packed__));
73
74struct btrfs_ioctl_received_subvol_args_32 {
75 char uuid[BTRFS_UUID_SIZE]; /* in */
76 __u64 stransid; /* in */
77 __u64 rtransid; /* out */
78 struct btrfs_ioctl_timespec_32 stime; /* in */
79 struct btrfs_ioctl_timespec_32 rtime; /* out */
80 __u64 flags; /* in */
81 __u64 reserved[16]; /* in */
82} __attribute__ ((__packed__));
83
84#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
85 struct btrfs_ioctl_received_subvol_args_32)
86#endif
87
88
Mark Fasheh416161d2013-08-06 11:42:51 -070089static int btrfs_clone(struct inode *src, struct inode *inode,
90 u64 off, u64 olen, u64 olen_aligned, u64 destoff);
91
Christoph Hellwig6cbff002009-04-17 10:37:41 +020092/* Mask out flags that are inappropriate for the given type of inode. */
93static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
94{
95 if (S_ISDIR(mode))
96 return flags;
97 else if (S_ISREG(mode))
98 return flags & ~FS_DIRSYNC_FL;
99 else
100 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
101}
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400102
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200103/*
104 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
105 */
106static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
107{
108 unsigned int iflags = 0;
109
110 if (flags & BTRFS_INODE_SYNC)
111 iflags |= FS_SYNC_FL;
112 if (flags & BTRFS_INODE_IMMUTABLE)
113 iflags |= FS_IMMUTABLE_FL;
114 if (flags & BTRFS_INODE_APPEND)
115 iflags |= FS_APPEND_FL;
116 if (flags & BTRFS_INODE_NODUMP)
117 iflags |= FS_NODUMP_FL;
118 if (flags & BTRFS_INODE_NOATIME)
119 iflags |= FS_NOATIME_FL;
120 if (flags & BTRFS_INODE_DIRSYNC)
121 iflags |= FS_DIRSYNC_FL;
Li Zefand0092bd2011-04-15 03:03:06 +0000122 if (flags & BTRFS_INODE_NODATACOW)
123 iflags |= FS_NOCOW_FL;
124
125 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
126 iflags |= FS_COMPR_FL;
127 else if (flags & BTRFS_INODE_NOCOMPRESS)
128 iflags |= FS_NOCOMP_FL;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200129
130 return iflags;
131}
132
133/*
134 * Update inode->i_flags based on the btrfs internal flags.
135 */
136void btrfs_update_iflags(struct inode *inode)
137{
138 struct btrfs_inode *ip = BTRFS_I(inode);
Filipe Manana3cc79392014-06-25 22:36:02 +0100139 unsigned int new_fl = 0;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200140
141 if (ip->flags & BTRFS_INODE_SYNC)
Filipe Manana3cc79392014-06-25 22:36:02 +0100142 new_fl |= S_SYNC;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200143 if (ip->flags & BTRFS_INODE_IMMUTABLE)
Filipe Manana3cc79392014-06-25 22:36:02 +0100144 new_fl |= S_IMMUTABLE;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200145 if (ip->flags & BTRFS_INODE_APPEND)
Filipe Manana3cc79392014-06-25 22:36:02 +0100146 new_fl |= S_APPEND;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200147 if (ip->flags & BTRFS_INODE_NOATIME)
Filipe Manana3cc79392014-06-25 22:36:02 +0100148 new_fl |= S_NOATIME;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200149 if (ip->flags & BTRFS_INODE_DIRSYNC)
Filipe Manana3cc79392014-06-25 22:36:02 +0100150 new_fl |= S_DIRSYNC;
151
152 set_mask_bits(&inode->i_flags,
153 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
154 new_fl);
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200155}
156
157/*
158 * Inherit flags from the parent inode.
159 *
Josef Bacike27425d2011-09-27 11:01:30 -0400160 * Currently only the compression flags and the cow flags are inherited.
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200161 */
162void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
163{
Chris Mason0b4dcea2009-06-11 11:13:35 -0400164 unsigned int flags;
165
166 if (!dir)
167 return;
168
169 flags = BTRFS_I(dir)->flags;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200170
Josef Bacike27425d2011-09-27 11:01:30 -0400171 if (flags & BTRFS_INODE_NOCOMPRESS) {
172 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
173 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
174 } else if (flags & BTRFS_INODE_COMPRESS) {
175 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
176 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
177 }
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200178
Liu Bo213490b2012-09-11 08:33:50 -0600179 if (flags & BTRFS_INODE_NODATACOW) {
Josef Bacike27425d2011-09-27 11:01:30 -0400180 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
Liu Bo213490b2012-09-11 08:33:50 -0600181 if (S_ISREG(inode->i_mode))
182 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
183 }
Josef Bacike27425d2011-09-27 11:01:30 -0400184
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200185 btrfs_update_iflags(inode);
186}
187
188static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
189{
Al Viro496ad9a2013-01-23 17:07:38 -0500190 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200191 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
192
193 if (copy_to_user(arg, &flags, sizeof(flags)))
194 return -EFAULT;
195 return 0;
196}
197
Liu Bo75e7cb72011-03-22 10:12:20 +0000198static int check_flags(unsigned int flags)
199{
200 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
201 FS_NOATIME_FL | FS_NODUMP_FL | \
202 FS_SYNC_FL | FS_DIRSYNC_FL | \
Li Zefane1e8fb62011-04-15 03:02:49 +0000203 FS_NOCOMP_FL | FS_COMPR_FL |
204 FS_NOCOW_FL))
Liu Bo75e7cb72011-03-22 10:12:20 +0000205 return -EOPNOTSUPP;
206
207 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
208 return -EINVAL;
209
Liu Bo75e7cb72011-03-22 10:12:20 +0000210 return 0;
211}
212
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200213static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
214{
Al Viro496ad9a2013-01-23 17:07:38 -0500215 struct inode *inode = file_inode(file);
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200216 struct btrfs_inode *ip = BTRFS_I(inode);
217 struct btrfs_root *root = ip->root;
218 struct btrfs_trans_handle *trans;
219 unsigned int flags, oldflags;
220 int ret;
Li Zefanf062abf2011-12-29 13:36:45 +0800221 u64 ip_oldflags;
222 unsigned int i_oldflags;
David Sterba7e97b8d2012-09-07 05:56:55 -0600223 umode_t mode;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200224
David Sterbabd60ea02014-01-16 15:50:22 +0100225 if (!inode_owner_or_capable(inode))
226 return -EPERM;
227
Li Zefanb83cc962010-12-20 16:04:08 +0800228 if (btrfs_root_readonly(root))
229 return -EROFS;
230
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200231 if (copy_from_user(&flags, arg, sizeof(flags)))
232 return -EFAULT;
233
Liu Bo75e7cb72011-03-22 10:12:20 +0000234 ret = check_flags(flags);
235 if (ret)
236 return ret;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200237
Jan Karae7848682012-06-12 16:20:32 +0200238 ret = mnt_want_write_file(file);
239 if (ret)
240 return ret;
241
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200242 mutex_lock(&inode->i_mutex);
243
Li Zefanf062abf2011-12-29 13:36:45 +0800244 ip_oldflags = ip->flags;
245 i_oldflags = inode->i_flags;
David Sterba7e97b8d2012-09-07 05:56:55 -0600246 mode = inode->i_mode;
Li Zefanf062abf2011-12-29 13:36:45 +0800247
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200248 flags = btrfs_mask_flags(inode->i_mode, flags);
249 oldflags = btrfs_flags_to_ioctl(ip->flags);
250 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
251 if (!capable(CAP_LINUX_IMMUTABLE)) {
252 ret = -EPERM;
253 goto out_unlock;
254 }
255 }
256
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200257 if (flags & FS_SYNC_FL)
258 ip->flags |= BTRFS_INODE_SYNC;
259 else
260 ip->flags &= ~BTRFS_INODE_SYNC;
261 if (flags & FS_IMMUTABLE_FL)
262 ip->flags |= BTRFS_INODE_IMMUTABLE;
263 else
264 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
265 if (flags & FS_APPEND_FL)
266 ip->flags |= BTRFS_INODE_APPEND;
267 else
268 ip->flags &= ~BTRFS_INODE_APPEND;
269 if (flags & FS_NODUMP_FL)
270 ip->flags |= BTRFS_INODE_NODUMP;
271 else
272 ip->flags &= ~BTRFS_INODE_NODUMP;
273 if (flags & FS_NOATIME_FL)
274 ip->flags |= BTRFS_INODE_NOATIME;
275 else
276 ip->flags &= ~BTRFS_INODE_NOATIME;
277 if (flags & FS_DIRSYNC_FL)
278 ip->flags |= BTRFS_INODE_DIRSYNC;
279 else
280 ip->flags &= ~BTRFS_INODE_DIRSYNC;
David Sterba7e97b8d2012-09-07 05:56:55 -0600281 if (flags & FS_NOCOW_FL) {
282 if (S_ISREG(mode)) {
283 /*
284 * It's safe to turn csums off here, no extents exist.
285 * Otherwise we want the flag to reflect the real COW
286 * status of the file and will not set it.
287 */
288 if (inode->i_size == 0)
289 ip->flags |= BTRFS_INODE_NODATACOW
290 | BTRFS_INODE_NODATASUM;
291 } else {
292 ip->flags |= BTRFS_INODE_NODATACOW;
293 }
294 } else {
295 /*
296 * Revert back under same assuptions as above
297 */
298 if (S_ISREG(mode)) {
299 if (inode->i_size == 0)
300 ip->flags &= ~(BTRFS_INODE_NODATACOW
301 | BTRFS_INODE_NODATASUM);
302 } else {
303 ip->flags &= ~BTRFS_INODE_NODATACOW;
304 }
305 }
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200306
Liu Bo75e7cb72011-03-22 10:12:20 +0000307 /*
308 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
309 * flag may be changed automatically if compression code won't make
310 * things smaller.
311 */
312 if (flags & FS_NOCOMP_FL) {
313 ip->flags &= ~BTRFS_INODE_COMPRESS;
314 ip->flags |= BTRFS_INODE_NOCOMPRESS;
Filipe David Borba Manana63541922014-01-07 11:47:46 +0000315
316 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
317 if (ret && ret != -ENODATA)
318 goto out_drop;
Liu Bo75e7cb72011-03-22 10:12:20 +0000319 } else if (flags & FS_COMPR_FL) {
Filipe David Borba Manana63541922014-01-07 11:47:46 +0000320 const char *comp;
321
Liu Bo75e7cb72011-03-22 10:12:20 +0000322 ip->flags |= BTRFS_INODE_COMPRESS;
323 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
Filipe David Borba Manana63541922014-01-07 11:47:46 +0000324
325 if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
326 comp = "lzo";
327 else
328 comp = "zlib";
329 ret = btrfs_set_prop(inode, "btrfs.compression",
330 comp, strlen(comp), 0);
331 if (ret)
332 goto out_drop;
333
Li Zefanebcb9042011-04-15 03:03:17 +0000334 } else {
Filipe Manana78a017a2014-09-11 11:44:49 +0100335 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
336 if (ret && ret != -ENODATA)
337 goto out_drop;
Li Zefanebcb9042011-04-15 03:03:17 +0000338 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
Liu Bo75e7cb72011-03-22 10:12:20 +0000339 }
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200340
Li Zefan4da6f1a2011-12-29 13:39:50 +0800341 trans = btrfs_start_transaction(root, 1);
Li Zefanf062abf2011-12-29 13:36:45 +0800342 if (IS_ERR(trans)) {
343 ret = PTR_ERR(trans);
344 goto out_drop;
345 }
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200346
Li Zefan306424cc2011-12-14 20:12:02 -0500347 btrfs_update_iflags(inode);
Josef Bacik0c4d2d92012-04-05 15:03:02 -0400348 inode_inc_iversion(inode);
Li Zefan306424cc2011-12-14 20:12:02 -0500349 inode->i_ctime = CURRENT_TIME;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200350 ret = btrfs_update_inode(trans, root, inode);
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200351
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200352 btrfs_end_transaction(trans, root);
Li Zefanf062abf2011-12-29 13:36:45 +0800353 out_drop:
354 if (ret) {
355 ip->flags = ip_oldflags;
356 inode->i_flags = i_oldflags;
357 }
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200358
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200359 out_unlock:
360 mutex_unlock(&inode->i_mutex);
Jan Karae7848682012-06-12 16:20:32 +0200361 mnt_drop_write_file(file);
liubo2d4e6f62011-02-24 09:38:16 +0000362 return ret;
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200363}
364
365static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
366{
Al Viro496ad9a2013-01-23 17:07:38 -0500367 struct inode *inode = file_inode(file);
Christoph Hellwig6cbff002009-04-17 10:37:41 +0200368
369 return put_user(inode->i_generation, arg);
370}
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400371
Li Dongyangf7039b12011-03-24 10:24:28 +0000372static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
373{
Al Viro54563d42013-09-01 15:57:51 -0400374 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
Li Dongyangf7039b12011-03-24 10:24:28 +0000375 struct btrfs_device *device;
376 struct request_queue *q;
377 struct fstrim_range range;
378 u64 minlen = ULLONG_MAX;
379 u64 num_devices = 0;
Al Viro815745c2011-11-17 15:40:49 -0500380 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
Li Dongyangf7039b12011-03-24 10:24:28 +0000381 int ret;
382
383 if (!capable(CAP_SYS_ADMIN))
384 return -EPERM;
385
Xiao Guangrong1f781602011-04-20 10:09:16 +0000386 rcu_read_lock();
387 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
388 dev_list) {
Li Dongyangf7039b12011-03-24 10:24:28 +0000389 if (!device->bdev)
390 continue;
391 q = bdev_get_queue(device->bdev);
392 if (blk_queue_discard(q)) {
393 num_devices++;
394 minlen = min((u64)q->limits.discard_granularity,
395 minlen);
396 }
397 }
Xiao Guangrong1f781602011-04-20 10:09:16 +0000398 rcu_read_unlock();
Lukas Czernerf4c697e2011-09-05 16:34:54 +0200399
Li Dongyangf7039b12011-03-24 10:24:28 +0000400 if (!num_devices)
401 return -EOPNOTSUPP;
Li Dongyangf7039b12011-03-24 10:24:28 +0000402 if (copy_from_user(&range, arg, sizeof(range)))
403 return -EFAULT;
Lukas Czernere515c182012-10-16 09:34:36 +0000404 if (range.start > total_bytes ||
405 range.len < fs_info->sb->s_blocksize)
Lukas Czernerf4c697e2011-09-05 16:34:54 +0200406 return -EINVAL;
Li Dongyangf7039b12011-03-24 10:24:28 +0000407
Lukas Czernerf4c697e2011-09-05 16:34:54 +0200408 range.len = min(range.len, total_bytes - range.start);
Li Dongyangf7039b12011-03-24 10:24:28 +0000409 range.minlen = max(range.minlen, minlen);
Al Viro815745c2011-11-17 15:40:49 -0500410 ret = btrfs_trim_fs(fs_info->tree_root, &range);
Li Dongyangf7039b12011-03-24 10:24:28 +0000411 if (ret < 0)
412 return ret;
413
414 if (copy_to_user(arg, &range, sizeof(range)))
415 return -EFAULT;
416
417 return 0;
418}
419
Stefan Behrensdd5f9612013-08-15 17:11:20 +0200420int btrfs_is_empty_uuid(u8 *uuid)
421{
Chris Mason46e0f662013-11-15 12:14:55 +0100422 int i;
423
424 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
425 if (uuid[i])
426 return 0;
427 }
428 return 1;
Stefan Behrensdd5f9612013-08-15 17:11:20 +0200429}
430
Miao Xied5c12072013-02-28 10:04:33 +0000431static noinline int create_subvol(struct inode *dir,
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400432 struct dentry *dentry,
Sage Weil72fd0322010-10-29 15:41:32 -0400433 char *name, int namelen,
Arne Jansen6f72c7e2011-09-14 15:58:21 +0200434 u64 *async_transid,
Miao Xie8696c532013-02-07 06:02:44 +0000435 struct btrfs_qgroup_inherit *inherit)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400436{
437 struct btrfs_trans_handle *trans;
438 struct btrfs_key key;
439 struct btrfs_root_item root_item;
440 struct btrfs_inode_item *inode_item;
441 struct extent_buffer *leaf;
Miao Xied5c12072013-02-28 10:04:33 +0000442 struct btrfs_root *root = BTRFS_I(dir)->root;
Yan, Zheng76dda932009-09-21 16:00:26 -0400443 struct btrfs_root *new_root;
Miao Xied5c12072013-02-28 10:04:33 +0000444 struct btrfs_block_rsv block_rsv;
Alexander Block8ea05e32012-07-25 17:35:53 +0200445 struct timespec cur_time = CURRENT_TIME;
Tsutomu Itoh5662344b32013-12-13 09:51:42 +0900446 struct inode *inode;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400447 int ret;
448 int err;
449 u64 objectid;
450 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
Chris Mason3de45862008-11-17 21:02:50 -0500451 u64 index = 0;
Miao Xied5c12072013-02-28 10:04:33 +0000452 u64 qgroup_reserved;
Alexander Block8ea05e32012-07-25 17:35:53 +0200453 uuid_le new_uuid;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400454
Li Zefan581bb052011-04-20 10:06:11 +0800455 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
Al Viro2fbe8c82011-07-16 21:38:06 -0400456 if (ret)
Yan, Zhenga22285a2010-05-16 10:48:46 -0400457 return ret;
Josef Bacik6a912212010-11-20 09:48:00 +0000458
Miao Xied5c12072013-02-28 10:04:33 +0000459 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
Josef Bacik9ed74f22009-09-11 16:12:44 -0400460 /*
Miao Xied5c12072013-02-28 10:04:33 +0000461 * The same as the snapshot creation, please see the comment
462 * of create_snapshot().
Josef Bacik9ed74f22009-09-11 16:12:44 -0400463 */
Miao Xied5c12072013-02-28 10:04:33 +0000464 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
Stefan Behrensdd5f9612013-08-15 17:11:20 +0200465 8, &qgroup_reserved, false);
Miao Xied5c12072013-02-28 10:04:33 +0000466 if (ret)
467 return ret;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400468
Miao Xied5c12072013-02-28 10:04:33 +0000469 trans = btrfs_start_transaction(root, 0);
470 if (IS_ERR(trans)) {
471 ret = PTR_ERR(trans);
Liu Bode6e8202014-01-09 14:57:06 +0800472 btrfs_subvolume_release_metadata(root, &block_rsv,
473 qgroup_reserved);
474 return ret;
Miao Xied5c12072013-02-28 10:04:33 +0000475 }
476 trans->block_rsv = &block_rsv;
477 trans->bytes_reserved = block_rsv.size;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400478
Miao Xie8696c532013-02-07 06:02:44 +0000479 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
Arne Jansen6f72c7e2011-09-14 15:58:21 +0200480 if (ret)
481 goto fail;
482
David Sterba4d75f8a2014-06-15 01:54:12 +0200483 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
Josef Bacik8e8a1e32008-07-24 12:17:14 -0400484 if (IS_ERR(leaf)) {
485 ret = PTR_ERR(leaf);
486 goto fail;
487 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400488
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400489 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400490 btrfs_set_header_bytenr(leaf, leaf->start);
491 btrfs_set_header_generation(leaf, trans->transid);
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400492 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400493 btrfs_set_header_owner(leaf, objectid);
494
Ross Kirk0a4e5582013-09-24 10:12:38 +0100495 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400496 BTRFS_FSID_SIZE);
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400497 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
Geert Uytterhoevenb308bc22013-08-20 13:20:15 +0200498 btrfs_header_chunk_tree_uuid(leaf),
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400499 BTRFS_UUID_SIZE);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400500 btrfs_mark_buffer_dirty(leaf);
501
Alexander Block8ea05e32012-07-25 17:35:53 +0200502 memset(&root_item, 0, sizeof(root_item));
503
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400504 inode_item = &root_item.inode;
Qu Wenruo3cae2102013-07-16 11:19:18 +0800505 btrfs_set_stack_inode_generation(inode_item, 1);
506 btrfs_set_stack_inode_size(inode_item, 3);
507 btrfs_set_stack_inode_nlink(inode_item, 1);
David Sterba707e8a02014-06-04 19:22:26 +0200508 btrfs_set_stack_inode_nbytes(inode_item, root->nodesize);
Qu Wenruo3cae2102013-07-16 11:19:18 +0800509 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400510
Qu Wenruo3cae2102013-07-16 11:19:18 +0800511 btrfs_set_root_flags(&root_item, 0);
512 btrfs_set_root_limit(&root_item, 0);
513 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
Li Zefan08fe4db2011-03-28 02:01:25 +0000514
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400515 btrfs_set_root_bytenr(&root_item, leaf->start);
Yan Zheng84234f32008-10-29 14:49:05 -0400516 btrfs_set_root_generation(&root_item, trans->transid);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400517 btrfs_set_root_level(&root_item, 0);
518 btrfs_set_root_refs(&root_item, 1);
Yan, Zheng86b9f2e2009-11-12 09:36:50 +0000519 btrfs_set_root_used(&root_item, leaf->len);
Yan Zheng80ff3852008-10-30 14:20:02 -0400520 btrfs_set_root_last_snapshot(&root_item, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400521
Alexander Block8ea05e32012-07-25 17:35:53 +0200522 btrfs_set_root_generation_v2(&root_item,
523 btrfs_root_generation(&root_item));
524 uuid_le_gen(&new_uuid);
525 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
Qu Wenruo3cae2102013-07-16 11:19:18 +0800526 btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
527 btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
Alexander Block8ea05e32012-07-25 17:35:53 +0200528 root_item.ctime = root_item.otime;
529 btrfs_set_root_ctransid(&root_item, trans->transid);
530 btrfs_set_root_otransid(&root_item, trans->transid);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400531
Chris Mason925baed2008-06-25 16:01:30 -0400532 btrfs_tree_unlock(leaf);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400533 free_extent_buffer(leaf);
534 leaf = NULL;
535
536 btrfs_set_root_dirid(&root_item, new_dirid);
537
538 key.objectid = objectid;
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400539 key.offset = 0;
David Sterba962a2982014-06-04 18:41:45 +0200540 key.type = BTRFS_ROOT_ITEM_KEY;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400541 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
542 &root_item);
543 if (ret)
544 goto fail;
545
Yan, Zheng76dda932009-09-21 16:00:26 -0400546 key.offset = (u64)-1;
547 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100548 if (IS_ERR(new_root)) {
549 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
550 ret = PTR_ERR(new_root);
551 goto fail;
552 }
Yan, Zheng76dda932009-09-21 16:00:26 -0400553
554 btrfs_record_root_in_trans(trans, new_root);
555
Filipe David Borba Manana63541922014-01-07 11:47:46 +0000556 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
Mark Fashehce598972011-07-26 11:32:23 -0700557 if (ret) {
558 /* We potentially lose an unused inode item here */
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100559 btrfs_abort_transaction(trans, root, ret);
Mark Fashehce598972011-07-26 11:32:23 -0700560 goto fail;
561 }
562
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400563 /*
564 * insert the directory item
565 */
Chris Mason3de45862008-11-17 21:02:50 -0500566 ret = btrfs_set_inode_index(dir, &index);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100567 if (ret) {
568 btrfs_abort_transaction(trans, root, ret);
569 goto fail;
570 }
Chris Mason3de45862008-11-17 21:02:50 -0500571
572 ret = btrfs_insert_dir_item(trans, root,
Miao Xie16cdcec2011-04-22 18:12:22 +0800573 name, namelen, dir, &key,
Chris Mason3de45862008-11-17 21:02:50 -0500574 BTRFS_FT_DIR, index);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100575 if (ret) {
576 btrfs_abort_transaction(trans, root, ret);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400577 goto fail;
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100578 }
Chris Mason0660b5a2008-11-17 20:37:39 -0500579
Yan Zheng52c26172009-01-05 15:43:43 -0500580 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
581 ret = btrfs_update_inode(trans, root, dir);
582 BUG_ON(ret);
583
Chris Mason0660b5a2008-11-17 20:37:39 -0500584 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400585 objectid, root->root_key.objectid,
Li Zefan33345d012011-04-20 10:31:50 +0800586 btrfs_ino(dir), index, name, namelen);
Chris Mason0660b5a2008-11-17 20:37:39 -0500587 BUG_ON(ret);
588
Stefan Behrensdd5f9612013-08-15 17:11:20 +0200589 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
590 root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
591 objectid);
592 if (ret)
593 btrfs_abort_transaction(trans, root, ret);
594
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400595fail:
Miao Xied5c12072013-02-28 10:04:33 +0000596 trans->block_rsv = NULL;
597 trans->bytes_reserved = 0;
Liu Bode6e8202014-01-09 14:57:06 +0800598 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
599
Sage Weil72fd0322010-10-29 15:41:32 -0400600 if (async_transid) {
601 *async_transid = trans->transid;
602 err = btrfs_commit_transaction_async(trans, root, 1);
Miao Xie00d71c92013-03-04 09:45:06 +0000603 if (err)
604 err = btrfs_commit_transaction(trans, root);
Sage Weil72fd0322010-10-29 15:41:32 -0400605 } else {
606 err = btrfs_commit_transaction(trans, root);
607 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400608 if (err && !ret)
609 ret = err;
Chris Mason1a65e242013-02-06 12:06:02 -0500610
Tsutomu Itoh5662344b32013-12-13 09:51:42 +0900611 if (!ret) {
612 inode = btrfs_lookup_dentry(dir, dentry);
Liu Bode6e8202014-01-09 14:57:06 +0800613 if (IS_ERR(inode))
614 return PTR_ERR(inode);
Tsutomu Itoh5662344b32013-12-13 09:51:42 +0900615 d_instantiate(dentry, inode);
616 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400617 return ret;
618}
619
Miao Xie8257b2d2014-03-06 13:38:19 +0800620static void btrfs_wait_nocow_write(struct btrfs_root *root)
621{
622 s64 writers;
623 DEFINE_WAIT(wait);
624
625 do {
626 prepare_to_wait(&root->subv_writers->wait, &wait,
627 TASK_UNINTERRUPTIBLE);
628
629 writers = percpu_counter_sum(&root->subv_writers->counter);
630 if (writers)
631 schedule();
632
633 finish_wait(&root->subv_writers->wait, &wait);
634 } while (writers);
635}
636
Miao Xiee9662f72013-02-28 10:01:15 +0000637static int create_snapshot(struct btrfs_root *root, struct inode *dir,
638 struct dentry *dentry, char *name, int namelen,
639 u64 *async_transid, bool readonly,
640 struct btrfs_qgroup_inherit *inherit)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400641{
Yan, Zheng2e4bfab2009-11-12 09:37:02 +0000642 struct inode *inode;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400643 struct btrfs_pending_snapshot *pending_snapshot;
644 struct btrfs_trans_handle *trans;
Yan, Zheng2e4bfab2009-11-12 09:37:02 +0000645 int ret;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400646
Miao Xie27cdeb72014-04-02 19:51:05 +0800647 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400648 return -EINVAL;
649
Miao Xie8257b2d2014-03-06 13:38:19 +0800650 atomic_inc(&root->will_be_snapshoted);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100651 smp_mb__after_atomic();
Miao Xie8257b2d2014-03-06 13:38:19 +0800652 btrfs_wait_nocow_write(root);
653
Miao Xie6a038432013-05-15 07:48:24 +0000654 ret = btrfs_start_delalloc_inodes(root, 0);
655 if (ret)
Miao Xie8257b2d2014-03-06 13:38:19 +0800656 goto out;
Miao Xie6a038432013-05-15 07:48:24 +0000657
Miao Xieb0244192013-11-04 23:13:25 +0800658 btrfs_wait_ordered_extents(root, -1);
Miao Xie6a038432013-05-15 07:48:24 +0000659
Yan, Zhenga22285a2010-05-16 10:48:46 -0400660 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
Miao Xie8257b2d2014-03-06 13:38:19 +0800661 if (!pending_snapshot) {
662 ret = -ENOMEM;
663 goto out;
664 }
Yan, Zhenga22285a2010-05-16 10:48:46 -0400665
Miao Xie66d8f3d2012-09-06 04:02:28 -0600666 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
667 BTRFS_BLOCK_RSV_TEMP);
Miao Xied5c12072013-02-28 10:04:33 +0000668 /*
669 * 1 - parent dir inode
670 * 2 - dir entries
671 * 1 - root item
672 * 2 - root ref/backref
673 * 1 - root of snapshot
Stefan Behrensdd5f9612013-08-15 17:11:20 +0200674 * 1 - UUID item
Miao Xied5c12072013-02-28 10:04:33 +0000675 */
676 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
Stefan Behrensdd5f9612013-08-15 17:11:20 +0200677 &pending_snapshot->block_rsv, 8,
Jeff Mahoneyee3441b2013-07-09 16:37:21 -0400678 &pending_snapshot->qgroup_reserved,
679 false);
Miao Xied5c12072013-02-28 10:04:33 +0000680 if (ret)
Miao Xie8257b2d2014-03-06 13:38:19 +0800681 goto free;
Miao Xied5c12072013-02-28 10:04:33 +0000682
Yan, Zhenga22285a2010-05-16 10:48:46 -0400683 pending_snapshot->dentry = dentry;
684 pending_snapshot->root = root;
Li Zefanb83cc962010-12-20 16:04:08 +0800685 pending_snapshot->readonly = readonly;
Miao Xiee9662f72013-02-28 10:01:15 +0000686 pending_snapshot->dir = dir;
Miao Xie8696c532013-02-07 06:02:44 +0000687 pending_snapshot->inherit = inherit;
Yan, Zhenga22285a2010-05-16 10:48:46 -0400688
Miao Xied5c12072013-02-28 10:04:33 +0000689 trans = btrfs_start_transaction(root, 0);
Yan, Zhenga22285a2010-05-16 10:48:46 -0400690 if (IS_ERR(trans)) {
691 ret = PTR_ERR(trans);
692 goto fail;
693 }
694
Josef Bacik83515832011-06-14 15:16:14 -0400695 spin_lock(&root->fs_info->trans_lock);
Yan, Zhenga22285a2010-05-16 10:48:46 -0400696 list_add(&pending_snapshot->list,
697 &trans->transaction->pending_snapshots);
Josef Bacik83515832011-06-14 15:16:14 -0400698 spin_unlock(&root->fs_info->trans_lock);
Sage Weil72fd0322010-10-29 15:41:32 -0400699 if (async_transid) {
700 *async_transid = trans->transid;
701 ret = btrfs_commit_transaction_async(trans,
702 root->fs_info->extent_root, 1);
Miao Xie00d71c92013-03-04 09:45:06 +0000703 if (ret)
704 ret = btrfs_commit_transaction(trans, root);
Sage Weil72fd0322010-10-29 15:41:32 -0400705 } else {
706 ret = btrfs_commit_transaction(trans,
707 root->fs_info->extent_root);
708 }
Miao Xieaec80302013-03-04 09:44:29 +0000709 if (ret)
Josef Bacikc37b2b62012-10-22 15:51:44 -0400710 goto fail;
Yan, Zhenga22285a2010-05-16 10:48:46 -0400711
712 ret = pending_snapshot->error;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400713 if (ret)
Yan, Zheng2e4bfab2009-11-12 09:37:02 +0000714 goto fail;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400715
Chris Masond3797302014-10-15 13:50:56 -0700716 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
717 if (ret)
718 goto fail;
719
720 /*
721 * If orphan cleanup did remove any orphans, it means the tree was
722 * modified and therefore the commit root is not the same as the
723 * current root anymore. This is a problem, because send uses the
724 * commit root and therefore can see inode items that don't exist
725 * in the current root anymore, and for example make calls to
726 * btrfs_iget, which will do tree lookups based on the current root
727 * and not on the commit root. Those lookups will fail, returning a
728 * -ESTALE error, and making send fail with that error. So make sure
729 * a send does not see any orphans we have just removed, and that it
730 * will see the same inodes regardless of whether a transaction
731 * commit happened before it started (meaning that the commit root
732 * will be the same as the current root) or not.
733 */
734 if (readonly && pending_snapshot->snap->node !=
735 pending_snapshot->snap->commit_root) {
736 trans = btrfs_join_transaction(pending_snapshot->snap);
737 if (IS_ERR(trans) && PTR_ERR(trans) != -ENOENT) {
738 ret = PTR_ERR(trans);
739 goto fail;
740 }
741 if (!IS_ERR(trans)) {
742 ret = btrfs_commit_transaction(trans,
743 pending_snapshot->snap);
744 if (ret)
745 goto fail;
746 }
747 }
748
Al Viro2fbe8c82011-07-16 21:38:06 -0400749 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
Yan, Zheng2e4bfab2009-11-12 09:37:02 +0000750 if (IS_ERR(inode)) {
751 ret = PTR_ERR(inode);
752 goto fail;
753 }
Tsutomu Itoh5662344b32013-12-13 09:51:42 +0900754
Yan, Zheng2e4bfab2009-11-12 09:37:02 +0000755 d_instantiate(dentry, inode);
756 ret = 0;
757fail:
Miao Xied5c12072013-02-28 10:04:33 +0000758 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
759 &pending_snapshot->block_rsv,
760 pending_snapshot->qgroup_reserved);
Miao Xie8257b2d2014-03-06 13:38:19 +0800761free:
Yan, Zhenga22285a2010-05-16 10:48:46 -0400762 kfree(pending_snapshot);
Miao Xie8257b2d2014-03-06 13:38:19 +0800763out:
764 atomic_dec(&root->will_be_snapshoted);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -0400765 return ret;
766}
767
Sage Weil4260f7c2010-10-29 15:46:43 -0400768/* copy of may_delete in fs/namei.c()
769 * Check whether we can remove a link victim from directory dir, check
770 * whether the type of victim is right.
771 * 1. We can't do it if dir is read-only (done in permission())
772 * 2. We should have write and exec permissions on dir
773 * 3. We can't remove anything from append-only dir
774 * 4. We can't do anything with immutable dir (done in permission())
775 * 5. If the sticky bit on dir is set we should either
776 * a. be owner of dir, or
777 * b. be owner of victim, or
778 * c. have CAP_FOWNER capability
779 * 6. If the victim is append-only or immutable we can't do antyhing with
780 * links pointing to it.
781 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
782 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
783 * 9. We can't remove a root or mountpoint.
784 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
785 * nfs_async_unlink().
786 */
787
Dulshani Gunawardhana67871252013-10-31 10:33:04 +0530788static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
Sage Weil4260f7c2010-10-29 15:46:43 -0400789{
790 int error;
791
792 if (!victim->d_inode)
793 return -ENOENT;
794
795 BUG_ON(victim->d_parent->d_inode != dir);
Jeff Layton4fa6b5e2012-10-10 15:25:25 -0400796 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
Sage Weil4260f7c2010-10-29 15:46:43 -0400797
798 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
799 if (error)
800 return error;
801 if (IS_APPEND(dir))
802 return -EPERM;
Miklos Szeredicbdf35b2014-10-24 00:14:36 +0200803 if (check_sticky(dir, victim->d_inode) || IS_APPEND(victim->d_inode) ||
Sage Weil4260f7c2010-10-29 15:46:43 -0400804 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
805 return -EPERM;
806 if (isdir) {
807 if (!S_ISDIR(victim->d_inode->i_mode))
808 return -ENOTDIR;
809 if (IS_ROOT(victim))
810 return -EBUSY;
811 } else if (S_ISDIR(victim->d_inode->i_mode))
812 return -EISDIR;
813 if (IS_DEADDIR(dir))
814 return -ENOENT;
815 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
816 return -EBUSY;
817 return 0;
818}
819
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400820/* copy of may_create in fs/namei.c() */
821static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
822{
823 if (child->d_inode)
824 return -EEXIST;
825 if (IS_DEADDIR(dir))
826 return -ENOENT;
827 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
828}
829
830/*
831 * Create a new subvolume below @parent. This is largely modeled after
832 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
833 * inside this filesystem so it's quite a bit simpler.
834 */
Yan, Zheng76dda932009-09-21 16:00:26 -0400835static noinline int btrfs_mksubvol(struct path *parent,
836 char *name, int namelen,
Sage Weil72fd0322010-10-29 15:41:32 -0400837 struct btrfs_root *snap_src,
Arne Jansen6f72c7e2011-09-14 15:58:21 +0200838 u64 *async_transid, bool readonly,
Miao Xie8696c532013-02-07 06:02:44 +0000839 struct btrfs_qgroup_inherit *inherit)
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400840{
Yan, Zheng76dda932009-09-21 16:00:26 -0400841 struct inode *dir = parent->dentry->d_inode;
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400842 struct dentry *dentry;
843 int error;
844
David Sterba5c50c9b2013-03-22 18:12:51 +0000845 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
846 if (error == -EINTR)
847 return error;
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400848
849 dentry = lookup_one_len(name, parent->dentry, namelen);
850 error = PTR_ERR(dentry);
851 if (IS_ERR(dentry))
852 goto out_unlock;
853
854 error = -EEXIST;
855 if (dentry->d_inode)
856 goto out_dput;
857
Yan, Zheng76dda932009-09-21 16:00:26 -0400858 error = btrfs_may_create(dir, dentry);
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400859 if (error)
Liu Boa874a632012-06-29 03:58:46 -0600860 goto out_dput;
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400861
Chris Mason9c520572012-12-17 14:26:57 -0500862 /*
863 * even if this name doesn't exist, we may get hash collisions.
864 * check for them now when we can safely fail
865 */
866 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
867 dir->i_ino, name,
868 namelen);
869 if (error)
870 goto out_dput;
871
Yan, Zheng76dda932009-09-21 16:00:26 -0400872 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
873
874 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
875 goto out_up_read;
876
Chris Mason3de45862008-11-17 21:02:50 -0500877 if (snap_src) {
Miao Xiee9662f72013-02-28 10:01:15 +0000878 error = create_snapshot(snap_src, dir, dentry, name, namelen,
Arne Jansen6f72c7e2011-09-14 15:58:21 +0200879 async_transid, readonly, inherit);
Chris Mason3de45862008-11-17 21:02:50 -0500880 } else {
Miao Xied5c12072013-02-28 10:04:33 +0000881 error = create_subvol(dir, dentry, name, namelen,
882 async_transid, inherit);
Chris Mason3de45862008-11-17 21:02:50 -0500883 }
Yan, Zheng76dda932009-09-21 16:00:26 -0400884 if (!error)
885 fsnotify_mkdir(dir, dentry);
886out_up_read:
887 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400888out_dput:
889 dput(dentry);
890out_unlock:
Yan, Zheng76dda932009-09-21 16:00:26 -0400891 mutex_unlock(&dir->i_mutex);
Christoph Hellwigcb8e7092008-10-09 13:39:39 -0400892 return error;
893}
894
Chris Mason4cb53002011-05-24 15:35:30 -0400895/*
896 * When we're defragging a range, we don't want to kick it off again
897 * if it is really just waiting for delalloc to send it down.
898 * If we find a nice big extent or delalloc range for the bytes in the
899 * file you want to defrag, we return 0 to let you know to skip this
900 * part of the file
901 */
David Sterbaaab110a2014-07-29 17:32:10 +0200902static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
Chris Mason4cb53002011-05-24 15:35:30 -0400903{
904 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
905 struct extent_map *em = NULL;
906 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
907 u64 end;
908
909 read_lock(&em_tree->lock);
910 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
911 read_unlock(&em_tree->lock);
912
913 if (em) {
914 end = extent_map_end(em);
915 free_extent_map(em);
916 if (end - offset > thresh)
917 return 0;
918 }
919 /* if we already have a nice delalloc here, just stop */
920 thresh /= 2;
921 end = count_range_bits(io_tree, &offset, offset + thresh,
922 thresh, EXTENT_DELALLOC, 1);
923 if (end >= thresh)
924 return 0;
925 return 1;
926}
927
928/*
929 * helper function to walk through a file and find extents
930 * newer than a specific transid, and smaller than thresh.
931 *
932 * This is used by the defragging code to find new and small
933 * extents
934 */
935static int find_new_extents(struct btrfs_root *root,
936 struct inode *inode, u64 newer_than,
David Sterbaaab110a2014-07-29 17:32:10 +0200937 u64 *off, u32 thresh)
Chris Mason4cb53002011-05-24 15:35:30 -0400938{
939 struct btrfs_path *path;
940 struct btrfs_key min_key;
Chris Mason4cb53002011-05-24 15:35:30 -0400941 struct extent_buffer *leaf;
942 struct btrfs_file_extent_item *extent;
943 int type;
944 int ret;
David Sterbaa4689d22011-05-31 17:08:14 +0000945 u64 ino = btrfs_ino(inode);
Chris Mason4cb53002011-05-24 15:35:30 -0400946
947 path = btrfs_alloc_path();
948 if (!path)
949 return -ENOMEM;
950
David Sterbaa4689d22011-05-31 17:08:14 +0000951 min_key.objectid = ino;
Chris Mason4cb53002011-05-24 15:35:30 -0400952 min_key.type = BTRFS_EXTENT_DATA_KEY;
953 min_key.offset = *off;
954
Dulshani Gunawardhana67871252013-10-31 10:33:04 +0530955 while (1) {
Filipe David Borba Manana6174d3c2013-10-01 16:13:42 +0100956 ret = btrfs_search_forward(root, &min_key, path, newer_than);
Chris Mason4cb53002011-05-24 15:35:30 -0400957 if (ret != 0)
958 goto none;
Filipe Mananaf094c9bd2014-03-12 01:28:24 +0000959process_slot:
David Sterbaa4689d22011-05-31 17:08:14 +0000960 if (min_key.objectid != ino)
Chris Mason4cb53002011-05-24 15:35:30 -0400961 goto none;
962 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
963 goto none;
964
965 leaf = path->nodes[0];
966 extent = btrfs_item_ptr(leaf, path->slots[0],
967 struct btrfs_file_extent_item);
968
969 type = btrfs_file_extent_type(leaf, extent);
970 if (type == BTRFS_FILE_EXTENT_REG &&
971 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
972 check_defrag_in_cache(inode, min_key.offset, thresh)) {
973 *off = min_key.offset;
974 btrfs_free_path(path);
975 return 0;
976 }
977
Filipe Mananaf094c9bd2014-03-12 01:28:24 +0000978 path->slots[0]++;
979 if (path->slots[0] < btrfs_header_nritems(leaf)) {
980 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
981 goto process_slot;
982 }
983
Chris Mason4cb53002011-05-24 15:35:30 -0400984 if (min_key.offset == (u64)-1)
985 goto none;
986
987 min_key.offset++;
988 btrfs_release_path(path);
989 }
990none:
991 btrfs_free_path(path);
992 return -ENOENT;
993}
994
Li Zefan6c282eb2012-06-11 16:03:35 +0800995static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
Liu Bo17ce6ef2012-03-29 09:57:45 -0400996{
997 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
Chris Mason940100a2010-03-10 10:52:59 -0500998 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
Li Zefan6c282eb2012-06-11 16:03:35 +0800999 struct extent_map *em;
1000 u64 len = PAGE_CACHE_SIZE;
Chris Mason940100a2010-03-10 10:52:59 -05001001
1002 /*
1003 * hopefully we have this extent in the tree already, try without
1004 * the full extent lock
1005 */
1006 read_lock(&em_tree->lock);
1007 em = lookup_extent_mapping(em_tree, start, len);
1008 read_unlock(&em_tree->lock);
1009
1010 if (!em) {
Filipe Manana308d9802014-03-11 13:56:15 +00001011 struct extent_state *cached = NULL;
1012 u64 end = start + len - 1;
1013
Chris Mason940100a2010-03-10 10:52:59 -05001014 /* get the big lock and read metadata off disk */
Filipe Manana308d9802014-03-11 13:56:15 +00001015 lock_extent_bits(io_tree, start, end, 0, &cached);
Chris Mason940100a2010-03-10 10:52:59 -05001016 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
Filipe Manana308d9802014-03-11 13:56:15 +00001017 unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
Chris Mason940100a2010-03-10 10:52:59 -05001018
Dan Carpenter6cf8bfb2010-03-20 11:22:10 +00001019 if (IS_ERR(em))
Li Zefan6c282eb2012-06-11 16:03:35 +08001020 return NULL;
Chris Mason940100a2010-03-10 10:52:59 -05001021 }
1022
Li Zefan6c282eb2012-06-11 16:03:35 +08001023 return em;
1024}
1025
1026static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1027{
1028 struct extent_map *next;
1029 bool ret = true;
1030
1031 /* this is the last extent */
1032 if (em->start + em->len >= i_size_read(inode))
1033 return false;
1034
1035 next = defrag_lookup_extent(inode, em->start + em->len);
Chris Masone9512d72014-08-26 13:55:54 -07001036 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1037 ret = false;
1038 else if ((em->block_start + em->block_len == next->block_start) &&
1039 (em->block_len > 128 * 1024 && next->block_len > 128 * 1024))
Li Zefan6c282eb2012-06-11 16:03:35 +08001040 ret = false;
1041
1042 free_extent_map(next);
1043 return ret;
1044}
1045
David Sterbaaab110a2014-07-29 17:32:10 +02001046static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
Andrew Mahonea43a2112012-06-19 21:08:32 -04001047 u64 *last_len, u64 *skip, u64 *defrag_end,
1048 int compress)
Li Zefan6c282eb2012-06-11 16:03:35 +08001049{
1050 struct extent_map *em;
1051 int ret = 1;
1052 bool next_mergeable = true;
1053
1054 /*
1055 * make sure that once we start defragging an extent, we keep on
1056 * defragging it
1057 */
1058 if (start < *defrag_end)
1059 return 1;
1060
1061 *skip = 0;
1062
1063 em = defrag_lookup_extent(inode, start);
1064 if (!em)
1065 return 0;
1066
Chris Mason940100a2010-03-10 10:52:59 -05001067 /* this will cover holes, and inline extents */
Liu Bo17ce6ef2012-03-29 09:57:45 -04001068 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
Chris Mason940100a2010-03-10 10:52:59 -05001069 ret = 0;
Liu Bo17ce6ef2012-03-29 09:57:45 -04001070 goto out;
1071 }
1072
Li Zefan6c282eb2012-06-11 16:03:35 +08001073 next_mergeable = defrag_check_next_extent(inode, em);
Chris Mason940100a2010-03-10 10:52:59 -05001074 /*
Li Zefan6c282eb2012-06-11 16:03:35 +08001075 * we hit a real extent, if it is big or the next extent is not a
1076 * real extent, don't bother defragging it
Chris Mason940100a2010-03-10 10:52:59 -05001077 */
Andrew Mahonea43a2112012-06-19 21:08:32 -04001078 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
Li Zefan6c282eb2012-06-11 16:03:35 +08001079 (em->len >= thresh || !next_mergeable))
Chris Mason940100a2010-03-10 10:52:59 -05001080 ret = 0;
Liu Bo17ce6ef2012-03-29 09:57:45 -04001081out:
Chris Mason940100a2010-03-10 10:52:59 -05001082 /*
1083 * last_len ends up being a counter of how many bytes we've defragged.
1084 * every time we choose not to defrag an extent, we reset *last_len
1085 * so that the next tiny extent will force a defrag.
1086 *
1087 * The end result of this is that tiny extents before a single big
1088 * extent will force at least part of that big extent to be defragged.
1089 */
1090 if (ret) {
Chris Mason940100a2010-03-10 10:52:59 -05001091 *defrag_end = extent_map_end(em);
1092 } else {
1093 *last_len = 0;
1094 *skip = extent_map_end(em);
1095 *defrag_end = 0;
1096 }
1097
1098 free_extent_map(em);
1099 return ret;
1100}
1101
Chris Mason4cb53002011-05-24 15:35:30 -04001102/*
1103 * it doesn't do much good to defrag one or two pages
1104 * at a time. This pulls in a nice chunk of pages
1105 * to COW and defrag.
1106 *
1107 * It also makes sure the delalloc code has enough
1108 * dirty data to avoid making new small extents as part
1109 * of the defrag
1110 *
1111 * It's a good idea to start RA on this range
1112 * before calling this.
1113 */
1114static int cluster_pages_for_defrag(struct inode *inode,
1115 struct page **pages,
1116 unsigned long start_index,
Justin Maggardc41570c2014-01-21 11:18:29 -08001117 unsigned long num_pages)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001118{
Chris Mason4cb53002011-05-24 15:35:30 -04001119 unsigned long file_end;
1120 u64 isize = i_size_read(inode);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001121 u64 page_start;
1122 u64 page_end;
Liu Bo1f12bd02012-03-29 09:57:44 -04001123 u64 page_cnt;
Chris Mason4cb53002011-05-24 15:35:30 -04001124 int ret;
1125 int i;
1126 int i_done;
1127 struct btrfs_ordered_extent *ordered;
1128 struct extent_state *cached_state = NULL;
Miao Xie600a45e2012-02-16 15:01:24 +08001129 struct extent_io_tree *tree;
Josef Bacik3b16a4e2011-09-21 15:05:58 -04001130 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
Chris Mason4cb53002011-05-24 15:35:30 -04001131
Chris Mason4cb53002011-05-24 15:35:30 -04001132 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
Liu Bo1f12bd02012-03-29 09:57:44 -04001133 if (!isize || start_index > file_end)
1134 return 0;
1135
1136 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
Chris Mason4cb53002011-05-24 15:35:30 -04001137
1138 ret = btrfs_delalloc_reserve_space(inode,
Liu Bo1f12bd02012-03-29 09:57:44 -04001139 page_cnt << PAGE_CACHE_SHIFT);
Chris Mason4cb53002011-05-24 15:35:30 -04001140 if (ret)
1141 return ret;
Chris Mason4cb53002011-05-24 15:35:30 -04001142 i_done = 0;
Miao Xie600a45e2012-02-16 15:01:24 +08001143 tree = &BTRFS_I(inode)->io_tree;
Chris Mason4cb53002011-05-24 15:35:30 -04001144
1145 /* step one, lock all the pages */
Liu Bo1f12bd02012-03-29 09:57:44 -04001146 for (i = 0; i < page_cnt; i++) {
Chris Mason4cb53002011-05-24 15:35:30 -04001147 struct page *page;
Miao Xie600a45e2012-02-16 15:01:24 +08001148again:
Josef Bacika94733d2011-07-11 10:47:06 -04001149 page = find_or_create_page(inode->i_mapping,
Miao Xie600a45e2012-02-16 15:01:24 +08001150 start_index + i, mask);
Chris Mason4cb53002011-05-24 15:35:30 -04001151 if (!page)
1152 break;
1153
Miao Xie600a45e2012-02-16 15:01:24 +08001154 page_start = page_offset(page);
1155 page_end = page_start + PAGE_CACHE_SIZE - 1;
1156 while (1) {
Filipe Manana308d9802014-03-11 13:56:15 +00001157 lock_extent_bits(tree, page_start, page_end,
1158 0, &cached_state);
Miao Xie600a45e2012-02-16 15:01:24 +08001159 ordered = btrfs_lookup_ordered_extent(inode,
1160 page_start);
Filipe Manana308d9802014-03-11 13:56:15 +00001161 unlock_extent_cached(tree, page_start, page_end,
1162 &cached_state, GFP_NOFS);
Miao Xie600a45e2012-02-16 15:01:24 +08001163 if (!ordered)
1164 break;
1165
1166 unlock_page(page);
1167 btrfs_start_ordered_extent(inode, ordered, 1);
1168 btrfs_put_ordered_extent(ordered);
1169 lock_page(page);
Liu Bo1f12bd02012-03-29 09:57:44 -04001170 /*
1171 * we unlocked the page above, so we need check if
1172 * it was released or not.
1173 */
1174 if (page->mapping != inode->i_mapping) {
1175 unlock_page(page);
1176 page_cache_release(page);
1177 goto again;
1178 }
Miao Xie600a45e2012-02-16 15:01:24 +08001179 }
1180
Chris Mason4cb53002011-05-24 15:35:30 -04001181 if (!PageUptodate(page)) {
1182 btrfs_readpage(NULL, page);
1183 lock_page(page);
1184 if (!PageUptodate(page)) {
1185 unlock_page(page);
1186 page_cache_release(page);
1187 ret = -EIO;
1188 break;
1189 }
1190 }
Miao Xie600a45e2012-02-16 15:01:24 +08001191
Miao Xie600a45e2012-02-16 15:01:24 +08001192 if (page->mapping != inode->i_mapping) {
1193 unlock_page(page);
1194 page_cache_release(page);
1195 goto again;
1196 }
1197
Chris Mason4cb53002011-05-24 15:35:30 -04001198 pages[i] = page;
1199 i_done++;
1200 }
1201 if (!i_done || ret)
1202 goto out;
1203
1204 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1205 goto out;
1206
1207 /*
1208 * so now we have a nice long stream of locked
1209 * and up to date pages, lets wait on them
1210 */
1211 for (i = 0; i < i_done; i++)
1212 wait_on_page_writeback(pages[i]);
1213
1214 page_start = page_offset(pages[0]);
1215 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1216
1217 lock_extent_bits(&BTRFS_I(inode)->io_tree,
Jeff Mahoneyd0082372012-03-01 14:57:19 +01001218 page_start, page_end - 1, 0, &cached_state);
Chris Mason4cb53002011-05-24 15:35:30 -04001219 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1220 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
Liu Bo9e8a4a82012-09-05 19:10:51 -06001221 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1222 &cached_state, GFP_NOFS);
Chris Mason4cb53002011-05-24 15:35:30 -04001223
Liu Bo1f12bd02012-03-29 09:57:44 -04001224 if (i_done != page_cnt) {
Josef Bacik9e0baf62011-07-15 15:16:44 +00001225 spin_lock(&BTRFS_I(inode)->lock);
1226 BTRFS_I(inode)->outstanding_extents++;
1227 spin_unlock(&BTRFS_I(inode)->lock);
Chris Mason4cb53002011-05-24 15:35:30 -04001228 btrfs_delalloc_release_space(inode,
Liu Bo1f12bd02012-03-29 09:57:44 -04001229 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
Chris Mason4cb53002011-05-24 15:35:30 -04001230 }
1231
1232
Liu Bo9e8a4a82012-09-05 19:10:51 -06001233 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1234 &cached_state, GFP_NOFS);
Chris Mason4cb53002011-05-24 15:35:30 -04001235
1236 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1237 page_start, page_end - 1, &cached_state,
1238 GFP_NOFS);
1239
1240 for (i = 0; i < i_done; i++) {
1241 clear_page_dirty_for_io(pages[i]);
1242 ClearPageChecked(pages[i]);
1243 set_page_extent_mapped(pages[i]);
1244 set_page_dirty(pages[i]);
1245 unlock_page(pages[i]);
1246 page_cache_release(pages[i]);
1247 }
1248 return i_done;
1249out:
1250 for (i = 0; i < i_done; i++) {
1251 unlock_page(pages[i]);
1252 page_cache_release(pages[i]);
1253 }
Liu Bo1f12bd02012-03-29 09:57:44 -04001254 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
Chris Mason4cb53002011-05-24 15:35:30 -04001255 return ret;
1256
1257}
1258
1259int btrfs_defrag_file(struct inode *inode, struct file *file,
1260 struct btrfs_ioctl_defrag_range_args *range,
1261 u64 newer_than, unsigned long max_to_defrag)
1262{
1263 struct btrfs_root *root = BTRFS_I(inode)->root;
Chris Mason4cb53002011-05-24 15:35:30 -04001264 struct file_ra_state *ra = NULL;
1265 unsigned long last_index;
Li Zefan151a31b2011-09-02 15:56:39 +08001266 u64 isize = i_size_read(inode);
Chris Mason940100a2010-03-10 10:52:59 -05001267 u64 last_len = 0;
1268 u64 skip = 0;
1269 u64 defrag_end = 0;
Chris Mason4cb53002011-05-24 15:35:30 -04001270 u64 newer_off = range->start;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001271 unsigned long i;
Li Zefan008873e2011-09-02 15:57:07 +08001272 unsigned long ra_index = 0;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001273 int ret;
Chris Mason4cb53002011-05-24 15:35:30 -04001274 int defrag_count = 0;
Li Zefan1a419d82010-10-25 15:12:50 +08001275 int compress_type = BTRFS_COMPRESS_ZLIB;
David Sterbaaab110a2014-07-29 17:32:10 +02001276 u32 extent_thresh = range->extent_thresh;
Justin Maggardc41570c2014-01-21 11:18:29 -08001277 unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1278 unsigned long cluster = max_cluster;
Chris Mason4cb53002011-05-24 15:35:30 -04001279 u64 new_align = ~((u64)128 * 1024 - 1);
1280 struct page **pages = NULL;
1281
Liu Bo0abd5b12013-04-16 09:20:28 +00001282 if (isize == 0)
1283 return 0;
1284
1285 if (range->start >= isize)
1286 return -EINVAL;
Li Zefan1a419d82010-10-25 15:12:50 +08001287
1288 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1289 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1290 return -EINVAL;
1291 if (range->compress_type)
1292 compress_type = range->compress_type;
1293 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001294
Liu Bo0abd5b12013-04-16 09:20:28 +00001295 if (extent_thresh == 0)
1296 extent_thresh = 256 * 1024;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001297
Chris Mason4cb53002011-05-24 15:35:30 -04001298 /*
1299 * if we were not given a file, allocate a readahead
1300 * context
1301 */
1302 if (!file) {
1303 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1304 if (!ra)
1305 return -ENOMEM;
1306 file_ra_state_init(ra, inode->i_mapping);
1307 } else {
1308 ra = &file->f_ra;
1309 }
1310
Dulshani Gunawardhanad9b0d9b2013-10-31 10:32:18 +05301311 pages = kmalloc_array(max_cluster, sizeof(struct page *),
Chris Mason4cb53002011-05-24 15:35:30 -04001312 GFP_NOFS);
1313 if (!pages) {
1314 ret = -ENOMEM;
1315 goto out_ra;
1316 }
1317
1318 /* find the last page to defrag */
Chris Mason1e701a32010-03-11 09:42:04 -05001319 if (range->start + range->len > range->start) {
Li Zefan151a31b2011-09-02 15:56:39 +08001320 last_index = min_t(u64, isize - 1,
Chris Mason1e701a32010-03-11 09:42:04 -05001321 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1322 } else {
Li Zefan151a31b2011-09-02 15:56:39 +08001323 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
Chris Mason1e701a32010-03-11 09:42:04 -05001324 }
1325
Chris Mason4cb53002011-05-24 15:35:30 -04001326 if (newer_than) {
1327 ret = find_new_extents(root, inode, newer_than,
1328 &newer_off, 64 * 1024);
1329 if (!ret) {
1330 range->start = newer_off;
1331 /*
1332 * we always align our defrag to help keep
1333 * the extents in the file evenly spaced
1334 */
1335 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
Chris Mason4cb53002011-05-24 15:35:30 -04001336 } else
1337 goto out_ra;
1338 } else {
1339 i = range->start >> PAGE_CACHE_SHIFT;
1340 }
1341 if (!max_to_defrag)
Liu Bo7ec31b52012-01-26 15:01:12 -05001342 max_to_defrag = last_index + 1;
Chris Mason4cb53002011-05-24 15:35:30 -04001343
Li Zefan2a0f7f52011-10-10 15:43:34 -04001344 /*
1345 * make writeback starts from i, so the defrag range can be
1346 * written sequentially.
1347 */
1348 if (i < inode->i_mapping->writeback_index)
1349 inode->i_mapping->writeback_index = i;
1350
Chris Masonf7f43cc2011-10-11 11:41:40 -04001351 while (i <= last_index && defrag_count < max_to_defrag &&
David Sterbaed6078f2014-06-05 01:59:57 +02001352 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) {
Chris Mason4cb53002011-05-24 15:35:30 -04001353 /*
1354 * make sure we stop running if someone unmounts
1355 * the FS
1356 */
1357 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1358 break;
1359
David Sterba210549e2013-02-09 23:38:06 +00001360 if (btrfs_defrag_cancelled(root->fs_info)) {
Frank Holtonefe120a2013-12-20 11:37:06 -05001361 printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n");
David Sterba210549e2013-02-09 23:38:06 +00001362 ret = -EAGAIN;
1363 break;
1364 }
1365
Liu Bo66c26892012-03-29 09:57:45 -04001366 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
Li Zefan6c282eb2012-06-11 16:03:35 +08001367 extent_thresh, &last_len, &skip,
Andrew Mahonea43a2112012-06-19 21:08:32 -04001368 &defrag_end, range->flags &
1369 BTRFS_DEFRAG_RANGE_COMPRESS)) {
Chris Mason940100a2010-03-10 10:52:59 -05001370 unsigned long next;
1371 /*
1372 * the should_defrag function tells us how much to skip
1373 * bump our counter by the suggested amount
1374 */
David Sterbaed6078f2014-06-05 01:59:57 +02001375 next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE);
Chris Mason940100a2010-03-10 10:52:59 -05001376 i = max(i + 1, next);
1377 continue;
1378 }
Li Zefan008873e2011-09-02 15:57:07 +08001379
1380 if (!newer_than) {
1381 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1382 PAGE_CACHE_SHIFT) - i;
1383 cluster = min(cluster, max_cluster);
1384 } else {
1385 cluster = max_cluster;
1386 }
1387
Li Zefan008873e2011-09-02 15:57:07 +08001388 if (i + cluster > ra_index) {
1389 ra_index = max(i, ra_index);
1390 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1391 cluster);
1392 ra_index += max_cluster;
1393 }
Chris Mason940100a2010-03-10 10:52:59 -05001394
Liu Boecb8bea2012-03-29 09:57:44 -04001395 mutex_lock(&inode->i_mutex);
Filipe David Borba Manana633085c2013-08-16 15:23:33 +01001396 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1397 BTRFS_I(inode)->force_compress = compress_type;
Li Zefan008873e2011-09-02 15:57:07 +08001398 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
Liu Boecb8bea2012-03-29 09:57:44 -04001399 if (ret < 0) {
1400 mutex_unlock(&inode->i_mutex);
Chris Mason4cb53002011-05-24 15:35:30 -04001401 goto out_ra;
Liu Boecb8bea2012-03-29 09:57:44 -04001402 }
Chris Mason940100a2010-03-10 10:52:59 -05001403
Chris Mason4cb53002011-05-24 15:35:30 -04001404 defrag_count += ret;
Namjae Jeond0e1d662012-12-11 16:00:21 -08001405 balance_dirty_pages_ratelimited(inode->i_mapping);
Liu Boecb8bea2012-03-29 09:57:44 -04001406 mutex_unlock(&inode->i_mutex);
Chris Mason4cb53002011-05-24 15:35:30 -04001407
1408 if (newer_than) {
1409 if (newer_off == (u64)-1)
1410 break;
1411
Liu Boe1f041e12012-03-29 09:57:45 -04001412 if (ret > 0)
1413 i += ret;
1414
Chris Mason4cb53002011-05-24 15:35:30 -04001415 newer_off = max(newer_off + 1,
1416 (u64)i << PAGE_CACHE_SHIFT);
1417
1418 ret = find_new_extents(root, inode,
1419 newer_than, &newer_off,
1420 64 * 1024);
1421 if (!ret) {
1422 range->start = newer_off;
1423 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
Chris Mason4cb53002011-05-24 15:35:30 -04001424 } else {
1425 break;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001426 }
Chris Mason4cb53002011-05-24 15:35:30 -04001427 } else {
Li Zefan008873e2011-09-02 15:57:07 +08001428 if (ret > 0) {
Li Zefancbcc8322011-09-02 15:56:25 +08001429 i += ret;
Li Zefan008873e2011-09-02 15:57:07 +08001430 last_len += ret << PAGE_CACHE_SHIFT;
1431 } else {
Li Zefancbcc8322011-09-02 15:56:25 +08001432 i++;
Li Zefan008873e2011-09-02 15:57:07 +08001433 last_len = 0;
1434 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001435 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001436 }
1437
Filipe Mananadec8ef92014-03-01 10:55:54 +00001438 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
Chris Mason1e701a32010-03-11 09:42:04 -05001439 filemap_flush(inode->i_mapping);
Filipe Mananadec8ef92014-03-01 10:55:54 +00001440 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1441 &BTRFS_I(inode)->runtime_flags))
1442 filemap_flush(inode->i_mapping);
1443 }
Chris Mason1e701a32010-03-11 09:42:04 -05001444
1445 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1446 /* the filemap_flush will queue IO into the worker threads, but
1447 * we have to make sure the IO is actually started and that
1448 * ordered extents get created before we return
1449 */
1450 atomic_inc(&root->fs_info->async_submit_draining);
1451 while (atomic_read(&root->fs_info->nr_async_submits) ||
1452 atomic_read(&root->fs_info->async_delalloc_pages)) {
1453 wait_event(root->fs_info->async_submit_wait,
1454 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1455 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1456 }
1457 atomic_dec(&root->fs_info->async_submit_draining);
Chris Mason1e701a32010-03-11 09:42:04 -05001458 }
1459
Li Zefan1a419d82010-10-25 15:12:50 +08001460 if (range->compress_type == BTRFS_COMPRESS_LZO) {
Mitch Harder2b0ce2c2012-07-24 11:58:43 -06001461 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
Li Zefan1a419d82010-10-25 15:12:50 +08001462 }
1463
Diego Calleja60ccf822011-09-01 16:33:57 +02001464 ret = defrag_count;
Chris Mason940100a2010-03-10 10:52:59 -05001465
Chris Mason4cb53002011-05-24 15:35:30 -04001466out_ra:
Filipe David Borba Manana633085c2013-08-16 15:23:33 +01001467 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1468 mutex_lock(&inode->i_mutex);
1469 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1470 mutex_unlock(&inode->i_mutex);
1471 }
Chris Mason4cb53002011-05-24 15:35:30 -04001472 if (!file)
1473 kfree(ra);
1474 kfree(pages);
Chris Mason940100a2010-03-10 10:52:59 -05001475 return ret;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001476}
1477
Miao Xie198605a2012-11-26 08:43:45 +00001478static noinline int btrfs_ioctl_resize(struct file *file,
Yan, Zheng76dda932009-09-21 16:00:26 -04001479 void __user *arg)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001480{
1481 u64 new_size;
1482 u64 old_size;
1483 u64 devid = 1;
Al Viro496ad9a2013-01-23 17:07:38 -05001484 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001485 struct btrfs_ioctl_vol_args *vol_args;
1486 struct btrfs_trans_handle *trans;
1487 struct btrfs_device *device = NULL;
1488 char *sizestr;
Gui Hecheng9a40f122014-03-31 18:03:25 +08001489 char *retptr;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001490 char *devstr = NULL;
1491 int ret = 0;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001492 int mod = 0;
1493
Chris Masone441d542009-01-05 16:57:23 -05001494 if (!capable(CAP_SYS_ADMIN))
1495 return -EPERM;
1496
Miao Xie198605a2012-11-26 08:43:45 +00001497 ret = mnt_want_write_file(file);
1498 if (ret)
1499 return ret;
1500
Stefan Behrens5ac00ad2012-11-05 17:54:08 +01001501 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1502 1)) {
Miao Xie97547672012-12-21 10:38:50 +00001503 mnt_drop_write_file(file);
Anand Jaine57138b2013-08-21 11:44:48 +08001504 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001505 }
1506
Stefan Behrens5ac00ad2012-11-05 17:54:08 +01001507 mutex_lock(&root->fs_info->volume_mutex);
Li Zefandae7b662009-04-08 15:06:54 +08001508 vol_args = memdup_user(arg, sizeof(*vol_args));
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001509 if (IS_ERR(vol_args)) {
1510 ret = PTR_ERR(vol_args);
1511 goto out;
1512 }
Mark Fasheh5516e592008-07-24 12:20:14 -04001513
1514 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001515
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001516 sizestr = vol_args->name;
1517 devstr = strchr(sizestr, ':');
1518 if (devstr) {
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001519 sizestr = devstr + 1;
1520 *devstr = '\0';
1521 devstr = vol_args->name;
ZhangZhen58dfae62014-05-13 16:36:08 +08001522 ret = kstrtoull(devstr, 10, &devid);
1523 if (ret)
1524 goto out_free;
Miao Xiedfd79822012-12-21 09:21:30 +00001525 if (!devid) {
1526 ret = -EINVAL;
1527 goto out_free;
1528 }
Frank Holtonefe120a2013-12-20 11:37:06 -05001529 btrfs_info(root->fs_info, "resizing devid %llu", devid);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001530 }
Miao Xiedba60f32012-12-21 09:19:51 +00001531
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01001532 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001533 if (!device) {
Frank Holtonefe120a2013-12-20 11:37:06 -05001534 btrfs_info(root->fs_info, "resizer unable to find device %llu",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02001535 devid);
Miao Xiedfd79822012-12-21 09:21:30 +00001536 ret = -ENODEV;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001537 goto out_free;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001538 }
Miao Xiedba60f32012-12-21 09:19:51 +00001539
1540 if (!device->writeable) {
Frank Holtonefe120a2013-12-20 11:37:06 -05001541 btrfs_info(root->fs_info,
1542 "resizer unable to apply on readonly device %llu",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02001543 devid);
Miao Xiedfd79822012-12-21 09:21:30 +00001544 ret = -EPERM;
Liu Bo4e42ae12012-06-14 02:23:19 -06001545 goto out_free;
1546 }
1547
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001548 if (!strcmp(sizestr, "max"))
1549 new_size = device->bdev->bd_inode->i_size;
1550 else {
1551 if (sizestr[0] == '-') {
1552 mod = -1;
1553 sizestr++;
1554 } else if (sizestr[0] == '+') {
1555 mod = 1;
1556 sizestr++;
1557 }
Gui Hecheng9a40f122014-03-31 18:03:25 +08001558 new_size = memparse(sizestr, &retptr);
1559 if (*retptr != '\0' || new_size == 0) {
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001560 ret = -EINVAL;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001561 goto out_free;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001562 }
1563 }
1564
Stefan Behrens63a212a2012-11-05 18:29:28 +01001565 if (device->is_tgtdev_for_dev_replace) {
Miao Xiedfd79822012-12-21 09:21:30 +00001566 ret = -EPERM;
Stefan Behrens63a212a2012-11-05 18:29:28 +01001567 goto out_free;
1568 }
1569
Miao Xie7cc8e582014-09-03 21:35:38 +08001570 old_size = btrfs_device_get_total_bytes(device);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001571
1572 if (mod < 0) {
1573 if (new_size > old_size) {
1574 ret = -EINVAL;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001575 goto out_free;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001576 }
1577 new_size = old_size - new_size;
1578 } else if (mod > 0) {
Wenliang Faneb8052e2013-12-20 15:28:56 +08001579 if (new_size > ULLONG_MAX - old_size) {
Gui Hecheng902c68a2014-05-29 09:19:58 +08001580 ret = -ERANGE;
Wenliang Faneb8052e2013-12-20 15:28:56 +08001581 goto out_free;
1582 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001583 new_size = old_size + new_size;
1584 }
1585
1586 if (new_size < 256 * 1024 * 1024) {
1587 ret = -EINVAL;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001588 goto out_free;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001589 }
1590 if (new_size > device->bdev->bd_inode->i_size) {
1591 ret = -EFBIG;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001592 goto out_free;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001593 }
1594
1595 do_div(new_size, root->sectorsize);
1596 new_size *= root->sectorsize;
1597
Frank Holtonefe120a2013-12-20 11:37:06 -05001598 printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +02001599 rcu_str_deref(device->name), new_size);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001600
1601 if (new_size > old_size) {
Yan, Zhenga22285a2010-05-16 10:48:46 -04001602 trans = btrfs_start_transaction(root, 0);
Tsutomu Itoh98d5dc12011-01-20 06:19:37 +00001603 if (IS_ERR(trans)) {
1604 ret = PTR_ERR(trans);
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001605 goto out_free;
Tsutomu Itoh98d5dc12011-01-20 06:19:37 +00001606 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001607 ret = btrfs_grow_device(trans, device, new_size);
1608 btrfs_commit_transaction(trans, root);
Mike Fleetwoodece7d202011-11-18 18:55:01 +00001609 } else if (new_size < old_size) {
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001610 ret = btrfs_shrink_device(device, new_size);
jeff.liu0253f402012-10-27 12:06:39 +00001611 } /* equal, nothing need to do */
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001612
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001613out_free:
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001614 kfree(vol_args);
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02001615out:
1616 mutex_unlock(&root->fs_info->volume_mutex);
Stefan Behrens5ac00ad2012-11-05 17:54:08 +01001617 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
Ilya Dryomov18f39c42013-01-20 15:57:57 +02001618 mnt_drop_write_file(file);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001619 return ret;
1620}
1621
Sage Weil72fd0322010-10-29 15:41:32 -04001622static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001623 char *name, unsigned long fd, int subvol,
1624 u64 *transid, bool readonly,
Miao Xie8696c532013-02-07 06:02:44 +00001625 struct btrfs_qgroup_inherit *inherit)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001626{
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001627 int namelen;
Chris Mason3de45862008-11-17 21:02:50 -05001628 int ret = 0;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001629
Liu Boa874a632012-06-29 03:58:46 -06001630 ret = mnt_want_write_file(file);
1631 if (ret)
1632 goto out;
1633
Sage Weil72fd0322010-10-29 15:41:32 -04001634 namelen = strlen(name);
1635 if (strchr(name, '/')) {
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001636 ret = -EINVAL;
Liu Boa874a632012-06-29 03:58:46 -06001637 goto out_drop_write;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001638 }
1639
Chris Mason16780ca2012-02-20 22:14:55 -05001640 if (name[0] == '.' &&
1641 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1642 ret = -EEXIST;
Liu Boa874a632012-06-29 03:58:46 -06001643 goto out_drop_write;
Chris Mason16780ca2012-02-20 22:14:55 -05001644 }
1645
Chris Mason3de45862008-11-17 21:02:50 -05001646 if (subvol) {
Sage Weil72fd0322010-10-29 15:41:32 -04001647 ret = btrfs_mksubvol(&file->f_path, name, namelen,
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001648 NULL, transid, readonly, inherit);
Christoph Hellwigcb8e7092008-10-09 13:39:39 -04001649 } else {
Al Viro2903ff02012-08-28 12:52:22 -04001650 struct fd src = fdget(fd);
Chris Mason3de45862008-11-17 21:02:50 -05001651 struct inode *src_inode;
Al Viro2903ff02012-08-28 12:52:22 -04001652 if (!src.file) {
Chris Mason3de45862008-11-17 21:02:50 -05001653 ret = -EINVAL;
Liu Boa874a632012-06-29 03:58:46 -06001654 goto out_drop_write;
Chris Mason3de45862008-11-17 21:02:50 -05001655 }
1656
Al Viro496ad9a2013-01-23 17:07:38 -05001657 src_inode = file_inode(src.file);
1658 if (src_inode->i_sb != file_inode(file)->i_sb) {
Frank Holtonefe120a2013-12-20 11:37:06 -05001659 btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1660 "Snapshot src from another FS");
Kusanagi Kouichi23ad5b12014-01-30 16:32:02 +09001661 ret = -EXDEV;
David Sterbad0242062014-01-15 18:15:52 +01001662 } else if (!inode_owner_or_capable(src_inode)) {
1663 /*
1664 * Subvolume creation is not restricted, but snapshots
1665 * are limited to own subvolumes only
1666 */
1667 ret = -EPERM;
Al Viroecd18812012-08-26 21:20:24 -04001668 } else {
1669 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1670 BTRFS_I(src_inode)->root,
1671 transid, readonly, inherit);
Chris Mason3de45862008-11-17 21:02:50 -05001672 }
Al Viro2903ff02012-08-28 12:52:22 -04001673 fdput(src);
Christoph Hellwigcb8e7092008-10-09 13:39:39 -04001674 }
Liu Boa874a632012-06-29 03:58:46 -06001675out_drop_write:
1676 mnt_drop_write_file(file);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001677out:
Sage Weil72fd0322010-10-29 15:41:32 -04001678 return ret;
1679}
1680
1681static noinline int btrfs_ioctl_snap_create(struct file *file,
Li Zefanfa0d2b92010-12-20 15:53:28 +08001682 void __user *arg, int subvol)
Sage Weil72fd0322010-10-29 15:41:32 -04001683{
Li Zefanfa0d2b92010-12-20 15:53:28 +08001684 struct btrfs_ioctl_vol_args *vol_args;
Sage Weil72fd0322010-10-29 15:41:32 -04001685 int ret;
1686
Li Zefanfa0d2b92010-12-20 15:53:28 +08001687 vol_args = memdup_user(arg, sizeof(*vol_args));
1688 if (IS_ERR(vol_args))
1689 return PTR_ERR(vol_args);
1690 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
Sage Weil72fd0322010-10-29 15:41:32 -04001691
Li Zefanfa0d2b92010-12-20 15:53:28 +08001692 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
Li Zefanb83cc962010-12-20 16:04:08 +08001693 vol_args->fd, subvol,
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001694 NULL, false, NULL);
Li Zefanfdfb1e42010-12-10 06:41:56 +00001695
Li Zefanfa0d2b92010-12-20 15:53:28 +08001696 kfree(vol_args);
1697 return ret;
1698}
Li Zefanfdfb1e42010-12-10 06:41:56 +00001699
Li Zefanfa0d2b92010-12-20 15:53:28 +08001700static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1701 void __user *arg, int subvol)
1702{
1703 struct btrfs_ioctl_vol_args_v2 *vol_args;
1704 int ret;
1705 u64 transid = 0;
1706 u64 *ptr = NULL;
Li Zefanb83cc962010-12-20 16:04:08 +08001707 bool readonly = false;
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001708 struct btrfs_qgroup_inherit *inherit = NULL;
Li Zefanfdfb1e42010-12-10 06:41:56 +00001709
Li Zefanfa0d2b92010-12-20 15:53:28 +08001710 vol_args = memdup_user(arg, sizeof(*vol_args));
1711 if (IS_ERR(vol_args))
1712 return PTR_ERR(vol_args);
1713 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
Sage Weil75eaa0e2010-12-10 00:36:28 +00001714
Li Zefanb83cc962010-12-20 16:04:08 +08001715 if (vol_args->flags &
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001716 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1717 BTRFS_SUBVOL_QGROUP_INHERIT)) {
Li Zefanb83cc962010-12-20 16:04:08 +08001718 ret = -EOPNOTSUPP;
Dan Carpenterc47ca322014-09-04 14:09:15 +03001719 goto free_args;
Sage Weil72fd0322010-10-29 15:41:32 -04001720 }
Li Zefanfa0d2b92010-12-20 15:53:28 +08001721
1722 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1723 ptr = &transid;
Li Zefanb83cc962010-12-20 16:04:08 +08001724 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1725 readonly = true;
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001726 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1727 if (vol_args->size > PAGE_CACHE_SIZE) {
1728 ret = -EINVAL;
Dan Carpenterc47ca322014-09-04 14:09:15 +03001729 goto free_args;
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001730 }
1731 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1732 if (IS_ERR(inherit)) {
1733 ret = PTR_ERR(inherit);
Dan Carpenterc47ca322014-09-04 14:09:15 +03001734 goto free_args;
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001735 }
1736 }
Li Zefanfa0d2b92010-12-20 15:53:28 +08001737
1738 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001739 vol_args->fd, subvol, ptr,
Miao Xie8696c532013-02-07 06:02:44 +00001740 readonly, inherit);
Dan Carpenterc47ca322014-09-04 14:09:15 +03001741 if (ret)
1742 goto free_inherit;
Li Zefanfa0d2b92010-12-20 15:53:28 +08001743
Dan Carpenterc47ca322014-09-04 14:09:15 +03001744 if (ptr && copy_to_user(arg +
1745 offsetof(struct btrfs_ioctl_vol_args_v2,
1746 transid),
1747 ptr, sizeof(*ptr)))
Li Zefanfa0d2b92010-12-20 15:53:28 +08001748 ret = -EFAULT;
Dan Carpenterc47ca322014-09-04 14:09:15 +03001749
1750free_inherit:
Arne Jansen6f72c7e2011-09-14 15:58:21 +02001751 kfree(inherit);
Dan Carpenterc47ca322014-09-04 14:09:15 +03001752free_args:
1753 kfree(vol_args);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04001754 return ret;
1755}
1756
Li Zefan0caa1022010-12-20 16:30:25 +08001757static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1758 void __user *arg)
1759{
Al Viro496ad9a2013-01-23 17:07:38 -05001760 struct inode *inode = file_inode(file);
Li Zefan0caa1022010-12-20 16:30:25 +08001761 struct btrfs_root *root = BTRFS_I(inode)->root;
1762 int ret = 0;
1763 u64 flags = 0;
1764
Li Zefan33345d012011-04-20 10:31:50 +08001765 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
Li Zefan0caa1022010-12-20 16:30:25 +08001766 return -EINVAL;
1767
1768 down_read(&root->fs_info->subvol_sem);
1769 if (btrfs_root_readonly(root))
1770 flags |= BTRFS_SUBVOL_RDONLY;
1771 up_read(&root->fs_info->subvol_sem);
1772
1773 if (copy_to_user(arg, &flags, sizeof(flags)))
1774 ret = -EFAULT;
1775
1776 return ret;
1777}
1778
1779static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1780 void __user *arg)
1781{
Al Viro496ad9a2013-01-23 17:07:38 -05001782 struct inode *inode = file_inode(file);
Li Zefan0caa1022010-12-20 16:30:25 +08001783 struct btrfs_root *root = BTRFS_I(inode)->root;
1784 struct btrfs_trans_handle *trans;
1785 u64 root_flags;
1786 u64 flags;
1787 int ret = 0;
1788
David Sterbabd60ea02014-01-16 15:50:22 +01001789 if (!inode_owner_or_capable(inode))
1790 return -EPERM;
1791
Liu Bob9ca0662012-06-29 03:58:49 -06001792 ret = mnt_want_write_file(file);
1793 if (ret)
1794 goto out;
Li Zefan0caa1022010-12-20 16:30:25 +08001795
Liu Bob9ca0662012-06-29 03:58:49 -06001796 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1797 ret = -EINVAL;
1798 goto out_drop_write;
1799 }
Li Zefan0caa1022010-12-20 16:30:25 +08001800
Liu Bob9ca0662012-06-29 03:58:49 -06001801 if (copy_from_user(&flags, arg, sizeof(flags))) {
1802 ret = -EFAULT;
1803 goto out_drop_write;
1804 }
Li Zefan0caa1022010-12-20 16:30:25 +08001805
Liu Bob9ca0662012-06-29 03:58:49 -06001806 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1807 ret = -EINVAL;
1808 goto out_drop_write;
1809 }
Li Zefan0caa1022010-12-20 16:30:25 +08001810
Liu Bob9ca0662012-06-29 03:58:49 -06001811 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1812 ret = -EOPNOTSUPP;
1813 goto out_drop_write;
1814 }
Li Zefan0caa1022010-12-20 16:30:25 +08001815
1816 down_write(&root->fs_info->subvol_sem);
1817
1818 /* nothing to do */
1819 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
Liu Bob9ca0662012-06-29 03:58:49 -06001820 goto out_drop_sem;
Li Zefan0caa1022010-12-20 16:30:25 +08001821
1822 root_flags = btrfs_root_flags(&root->root_item);
David Sterba2c686532013-12-16 17:34:17 +01001823 if (flags & BTRFS_SUBVOL_RDONLY) {
Li Zefan0caa1022010-12-20 16:30:25 +08001824 btrfs_set_root_flags(&root->root_item,
1825 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
David Sterba2c686532013-12-16 17:34:17 +01001826 } else {
1827 /*
1828 * Block RO -> RW transition if this subvolume is involved in
1829 * send
1830 */
1831 spin_lock(&root->root_item_lock);
1832 if (root->send_in_progress == 0) {
1833 btrfs_set_root_flags(&root->root_item,
Li Zefan0caa1022010-12-20 16:30:25 +08001834 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
David Sterba2c686532013-12-16 17:34:17 +01001835 spin_unlock(&root->root_item_lock);
1836 } else {
1837 spin_unlock(&root->root_item_lock);
1838 btrfs_warn(root->fs_info,
1839 "Attempt to set subvolume %llu read-write during send",
1840 root->root_key.objectid);
1841 ret = -EPERM;
1842 goto out_drop_sem;
1843 }
1844 }
Li Zefan0caa1022010-12-20 16:30:25 +08001845
1846 trans = btrfs_start_transaction(root, 1);
1847 if (IS_ERR(trans)) {
1848 ret = PTR_ERR(trans);
1849 goto out_reset;
1850 }
1851
Li Zefanb4dc2b82011-02-16 06:06:34 +00001852 ret = btrfs_update_root(trans, root->fs_info->tree_root,
Li Zefan0caa1022010-12-20 16:30:25 +08001853 &root->root_key, &root->root_item);
1854
1855 btrfs_commit_transaction(trans, root);
1856out_reset:
1857 if (ret)
1858 btrfs_set_root_flags(&root->root_item, root_flags);
Liu Bob9ca0662012-06-29 03:58:49 -06001859out_drop_sem:
Li Zefan0caa1022010-12-20 16:30:25 +08001860 up_write(&root->fs_info->subvol_sem);
Liu Bob9ca0662012-06-29 03:58:49 -06001861out_drop_write:
1862 mnt_drop_write_file(file);
1863out:
Li Zefan0caa1022010-12-20 16:30:25 +08001864 return ret;
1865}
1866
Yan, Zheng76dda932009-09-21 16:00:26 -04001867/*
1868 * helper to check if the subvolume references other subvolumes
1869 */
1870static noinline int may_destroy_subvol(struct btrfs_root *root)
1871{
1872 struct btrfs_path *path;
Josef Bacik175a2b82013-08-12 15:36:44 -04001873 struct btrfs_dir_item *di;
Yan, Zheng76dda932009-09-21 16:00:26 -04001874 struct btrfs_key key;
Josef Bacik175a2b82013-08-12 15:36:44 -04001875 u64 dir_id;
Yan, Zheng76dda932009-09-21 16:00:26 -04001876 int ret;
1877
1878 path = btrfs_alloc_path();
1879 if (!path)
1880 return -ENOMEM;
1881
Josef Bacik175a2b82013-08-12 15:36:44 -04001882 /* Make sure this root isn't set as the default subvol */
1883 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1884 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1885 dir_id, "default", 7, 0);
1886 if (di && !IS_ERR(di)) {
1887 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1888 if (key.objectid == root->root_key.objectid) {
Guangyu Sun72de6b52014-03-11 11:24:18 -07001889 ret = -EPERM;
1890 btrfs_err(root->fs_info, "deleting default subvolume "
1891 "%llu is not allowed", key.objectid);
Josef Bacik175a2b82013-08-12 15:36:44 -04001892 goto out;
1893 }
1894 btrfs_release_path(path);
1895 }
1896
Yan, Zheng76dda932009-09-21 16:00:26 -04001897 key.objectid = root->root_key.objectid;
1898 key.type = BTRFS_ROOT_REF_KEY;
1899 key.offset = (u64)-1;
1900
1901 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1902 &key, path, 0, 0);
1903 if (ret < 0)
1904 goto out;
1905 BUG_ON(ret == 0);
1906
1907 ret = 0;
1908 if (path->slots[0] > 0) {
1909 path->slots[0]--;
1910 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1911 if (key.objectid == root->root_key.objectid &&
1912 key.type == BTRFS_ROOT_REF_KEY)
1913 ret = -ENOTEMPTY;
1914 }
1915out:
1916 btrfs_free_path(path);
1917 return ret;
1918}
1919
Chris Masonac8e9812010-02-28 15:39:26 -05001920static noinline int key_in_sk(struct btrfs_key *key,
1921 struct btrfs_ioctl_search_key *sk)
1922{
Chris Masonabc6e132010-03-18 12:10:08 -04001923 struct btrfs_key test;
1924 int ret;
1925
1926 test.objectid = sk->min_objectid;
1927 test.type = sk->min_type;
1928 test.offset = sk->min_offset;
1929
1930 ret = btrfs_comp_cpu_keys(key, &test);
1931 if (ret < 0)
Chris Masonac8e9812010-02-28 15:39:26 -05001932 return 0;
Chris Masonabc6e132010-03-18 12:10:08 -04001933
1934 test.objectid = sk->max_objectid;
1935 test.type = sk->max_type;
1936 test.offset = sk->max_offset;
1937
1938 ret = btrfs_comp_cpu_keys(key, &test);
1939 if (ret > 0)
Chris Masonac8e9812010-02-28 15:39:26 -05001940 return 0;
1941 return 1;
1942}
1943
1944static noinline int copy_to_sk(struct btrfs_root *root,
1945 struct btrfs_path *path,
1946 struct btrfs_key *key,
1947 struct btrfs_ioctl_search_key *sk,
Gerhard Heift9b6e8172014-01-30 16:24:00 +01001948 size_t *buf_size,
Gerhard Heiftba346b32014-01-30 16:24:02 +01001949 char __user *ubuf,
Chris Masonac8e9812010-02-28 15:39:26 -05001950 unsigned long *sk_offset,
1951 int *num_found)
1952{
1953 u64 found_transid;
1954 struct extent_buffer *leaf;
1955 struct btrfs_ioctl_search_header sh;
1956 unsigned long item_off;
1957 unsigned long item_len;
1958 int nritems;
1959 int i;
1960 int slot;
Chris Masonac8e9812010-02-28 15:39:26 -05001961 int ret = 0;
1962
1963 leaf = path->nodes[0];
1964 slot = path->slots[0];
1965 nritems = btrfs_header_nritems(leaf);
1966
1967 if (btrfs_header_generation(leaf) > sk->max_transid) {
1968 i = nritems;
1969 goto advance_key;
1970 }
1971 found_transid = btrfs_header_generation(leaf);
1972
1973 for (i = slot; i < nritems; i++) {
1974 item_off = btrfs_item_ptr_offset(leaf, i);
1975 item_len = btrfs_item_size_nr(leaf, i);
1976
Gabriel de Perthuis03b71c62013-05-06 17:40:18 +00001977 btrfs_item_key_to_cpu(leaf, key, i);
1978 if (!key_in_sk(key, sk))
1979 continue;
1980
Gerhard Heift9b6e8172014-01-30 16:24:00 +01001981 if (sizeof(sh) + item_len > *buf_size) {
Gerhard Heift8f5f6172014-01-30 16:23:59 +01001982 if (*num_found) {
1983 ret = 1;
1984 goto out;
1985 }
Chris Masonac8e9812010-02-28 15:39:26 -05001986
Gerhard Heift8f5f6172014-01-30 16:23:59 +01001987 /*
1988 * return one empty item back for v1, which does not
1989 * handle -EOVERFLOW
1990 */
1991
Gerhard Heift9b6e8172014-01-30 16:24:00 +01001992 *buf_size = sizeof(sh) + item_len;
Chris Masonac8e9812010-02-28 15:39:26 -05001993 item_len = 0;
Gerhard Heift8f5f6172014-01-30 16:23:59 +01001994 ret = -EOVERFLOW;
1995 }
Chris Masonac8e9812010-02-28 15:39:26 -05001996
Gerhard Heift9b6e8172014-01-30 16:24:00 +01001997 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
Chris Masonac8e9812010-02-28 15:39:26 -05001998 ret = 1;
Gerhard Heift25c9bc22014-01-30 16:23:57 +01001999 goto out;
Chris Masonac8e9812010-02-28 15:39:26 -05002000 }
2001
Chris Masonac8e9812010-02-28 15:39:26 -05002002 sh.objectid = key->objectid;
2003 sh.offset = key->offset;
2004 sh.type = key->type;
2005 sh.len = item_len;
2006 sh.transid = found_transid;
2007
2008 /* copy search result header */
Gerhard Heiftba346b32014-01-30 16:24:02 +01002009 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2010 ret = -EFAULT;
2011 goto out;
2012 }
2013
Chris Masonac8e9812010-02-28 15:39:26 -05002014 *sk_offset += sizeof(sh);
2015
2016 if (item_len) {
Gerhard Heiftba346b32014-01-30 16:24:02 +01002017 char __user *up = ubuf + *sk_offset;
Chris Masonac8e9812010-02-28 15:39:26 -05002018 /* copy the item */
Gerhard Heiftba346b32014-01-30 16:24:02 +01002019 if (read_extent_buffer_to_user(leaf, up,
2020 item_off, item_len)) {
2021 ret = -EFAULT;
2022 goto out;
2023 }
2024
Chris Masonac8e9812010-02-28 15:39:26 -05002025 *sk_offset += item_len;
Chris Masonac8e9812010-02-28 15:39:26 -05002026 }
Hugo Millse2156862011-05-14 17:43:41 +00002027 (*num_found)++;
Chris Masonac8e9812010-02-28 15:39:26 -05002028
Gerhard Heift8f5f6172014-01-30 16:23:59 +01002029 if (ret) /* -EOVERFLOW from above */
2030 goto out;
2031
Gerhard Heift25c9bc22014-01-30 16:23:57 +01002032 if (*num_found >= sk->nr_items) {
2033 ret = 1;
2034 goto out;
2035 }
Chris Masonac8e9812010-02-28 15:39:26 -05002036 }
2037advance_key:
Chris Masonac8e9812010-02-28 15:39:26 -05002038 ret = 0;
Chris Masonabc6e132010-03-18 12:10:08 -04002039 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
2040 key->offset++;
2041 else if (key->type < (u8)-1 && key->type < sk->max_type) {
2042 key->offset = 0;
2043 key->type++;
2044 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
2045 key->offset = 0;
2046 key->type = 0;
2047 key->objectid++;
2048 } else
2049 ret = 1;
Gerhard Heift25c9bc22014-01-30 16:23:57 +01002050out:
Gerhard Heiftba346b32014-01-30 16:24:02 +01002051 /*
2052 * 0: all items from this leaf copied, continue with next
2053 * 1: * more items can be copied, but unused buffer is too small
2054 * * all items were found
2055 * Either way, it will stops the loop which iterates to the next
2056 * leaf
2057 * -EOVERFLOW: item was to large for buffer
2058 * -EFAULT: could not copy extent buffer back to userspace
2059 */
Chris Masonac8e9812010-02-28 15:39:26 -05002060 return ret;
2061}
2062
2063static noinline int search_ioctl(struct inode *inode,
Gerhard Heift12544442014-01-30 16:23:58 +01002064 struct btrfs_ioctl_search_key *sk,
Gerhard Heift9b6e8172014-01-30 16:24:00 +01002065 size_t *buf_size,
Gerhard Heiftba346b32014-01-30 16:24:02 +01002066 char __user *ubuf)
Chris Masonac8e9812010-02-28 15:39:26 -05002067{
2068 struct btrfs_root *root;
2069 struct btrfs_key key;
Chris Masonac8e9812010-02-28 15:39:26 -05002070 struct btrfs_path *path;
Chris Masonac8e9812010-02-28 15:39:26 -05002071 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2072 int ret;
2073 int num_found = 0;
2074 unsigned long sk_offset = 0;
2075
Gerhard Heift9b6e8172014-01-30 16:24:00 +01002076 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2077 *buf_size = sizeof(struct btrfs_ioctl_search_header);
Gerhard Heift12544442014-01-30 16:23:58 +01002078 return -EOVERFLOW;
Gerhard Heift9b6e8172014-01-30 16:24:00 +01002079 }
Gerhard Heift12544442014-01-30 16:23:58 +01002080
Chris Masonac8e9812010-02-28 15:39:26 -05002081 path = btrfs_alloc_path();
2082 if (!path)
2083 return -ENOMEM;
2084
2085 if (sk->tree_id == 0) {
2086 /* search the root of the inode that was passed */
2087 root = BTRFS_I(inode)->root;
2088 } else {
2089 key.objectid = sk->tree_id;
2090 key.type = BTRFS_ROOT_ITEM_KEY;
2091 key.offset = (u64)-1;
2092 root = btrfs_read_fs_root_no_name(info, &key);
2093 if (IS_ERR(root)) {
Frank Holtonefe120a2013-12-20 11:37:06 -05002094 printk(KERN_ERR "BTRFS: could not find root %llu\n",
Chris Masonac8e9812010-02-28 15:39:26 -05002095 sk->tree_id);
2096 btrfs_free_path(path);
2097 return -ENOENT;
2098 }
2099 }
2100
2101 key.objectid = sk->min_objectid;
2102 key.type = sk->min_type;
2103 key.offset = sk->min_offset;
2104
Dulshani Gunawardhana67871252013-10-31 10:33:04 +05302105 while (1) {
Filipe David Borba Manana6174d3c2013-10-01 16:13:42 +01002106 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
Chris Masonac8e9812010-02-28 15:39:26 -05002107 if (ret != 0) {
2108 if (ret > 0)
2109 ret = 0;
2110 goto err;
2111 }
Gerhard Heiftba346b32014-01-30 16:24:02 +01002112 ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf,
Chris Masonac8e9812010-02-28 15:39:26 -05002113 &sk_offset, &num_found);
David Sterbab3b4aa72011-04-21 01:20:15 +02002114 btrfs_release_path(path);
Gerhard Heift25c9bc22014-01-30 16:23:57 +01002115 if (ret)
Chris Masonac8e9812010-02-28 15:39:26 -05002116 break;
2117
2118 }
Gerhard Heift8f5f6172014-01-30 16:23:59 +01002119 if (ret > 0)
2120 ret = 0;
Chris Masonac8e9812010-02-28 15:39:26 -05002121err:
2122 sk->nr_items = num_found;
2123 btrfs_free_path(path);
2124 return ret;
2125}
2126
2127static noinline int btrfs_ioctl_tree_search(struct file *file,
2128 void __user *argp)
2129{
Gerhard Heiftba346b32014-01-30 16:24:02 +01002130 struct btrfs_ioctl_search_args __user *uargs;
2131 struct btrfs_ioctl_search_key sk;
Gerhard Heift9b6e8172014-01-30 16:24:00 +01002132 struct inode *inode;
2133 int ret;
2134 size_t buf_size;
Chris Masonac8e9812010-02-28 15:39:26 -05002135
2136 if (!capable(CAP_SYS_ADMIN))
2137 return -EPERM;
2138
Gerhard Heiftba346b32014-01-30 16:24:02 +01002139 uargs = (struct btrfs_ioctl_search_args __user *)argp;
Chris Masonac8e9812010-02-28 15:39:26 -05002140
Gerhard Heiftba346b32014-01-30 16:24:02 +01002141 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2142 return -EFAULT;
2143
2144 buf_size = sizeof(uargs->buf);
Chris Masonac8e9812010-02-28 15:39:26 -05002145
Al Viro496ad9a2013-01-23 17:07:38 -05002146 inode = file_inode(file);
Gerhard Heiftba346b32014-01-30 16:24:02 +01002147 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
Gerhard Heift8f5f6172014-01-30 16:23:59 +01002148
2149 /*
2150 * In the origin implementation an overflow is handled by returning a
2151 * search header with a len of zero, so reset ret.
2152 */
2153 if (ret == -EOVERFLOW)
2154 ret = 0;
2155
Gerhard Heiftba346b32014-01-30 16:24:02 +01002156 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
Chris Masonac8e9812010-02-28 15:39:26 -05002157 ret = -EFAULT;
Chris Masonac8e9812010-02-28 15:39:26 -05002158 return ret;
2159}
2160
Gerhard Heiftcc68a8a2014-01-30 16:24:03 +01002161static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2162 void __user *argp)
2163{
2164 struct btrfs_ioctl_search_args_v2 __user *uarg;
2165 struct btrfs_ioctl_search_args_v2 args;
2166 struct inode *inode;
2167 int ret;
2168 size_t buf_size;
2169 const size_t buf_limit = 16 * 1024 * 1024;
2170
2171 if (!capable(CAP_SYS_ADMIN))
2172 return -EPERM;
2173
2174 /* copy search header and buffer size */
2175 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2176 if (copy_from_user(&args, uarg, sizeof(args)))
2177 return -EFAULT;
2178
2179 buf_size = args.buf_size;
2180
2181 if (buf_size < sizeof(struct btrfs_ioctl_search_header))
2182 return -EOVERFLOW;
2183
2184 /* limit result size to 16MB */
2185 if (buf_size > buf_limit)
2186 buf_size = buf_limit;
2187
2188 inode = file_inode(file);
2189 ret = search_ioctl(inode, &args.key, &buf_size,
2190 (char *)(&uarg->buf[0]));
2191 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2192 ret = -EFAULT;
2193 else if (ret == -EOVERFLOW &&
2194 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2195 ret = -EFAULT;
2196
Yan, Zheng76dda932009-09-21 16:00:26 -04002197 return ret;
2198}
2199
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002200/*
Chris Masonac8e9812010-02-28 15:39:26 -05002201 * Search INODE_REFs to identify path name of 'dirid' directory
2202 * in a 'tree_id' tree. and sets path name to 'name'.
2203 */
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002204static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2205 u64 tree_id, u64 dirid, char *name)
2206{
2207 struct btrfs_root *root;
2208 struct btrfs_key key;
Chris Masonac8e9812010-02-28 15:39:26 -05002209 char *ptr;
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002210 int ret = -1;
2211 int slot;
2212 int len;
2213 int total_len = 0;
2214 struct btrfs_inode_ref *iref;
2215 struct extent_buffer *l;
2216 struct btrfs_path *path;
2217
2218 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2219 name[0]='\0';
2220 return 0;
2221 }
2222
2223 path = btrfs_alloc_path();
2224 if (!path)
2225 return -ENOMEM;
2226
Chris Masonac8e9812010-02-28 15:39:26 -05002227 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002228
2229 key.objectid = tree_id;
2230 key.type = BTRFS_ROOT_ITEM_KEY;
2231 key.offset = (u64)-1;
2232 root = btrfs_read_fs_root_no_name(info, &key);
2233 if (IS_ERR(root)) {
Frank Holtonefe120a2013-12-20 11:37:06 -05002234 printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
Chris Mason8ad6fca2010-03-18 12:23:10 -04002235 ret = -ENOENT;
2236 goto out;
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002237 }
2238
2239 key.objectid = dirid;
2240 key.type = BTRFS_INODE_REF_KEY;
Chris Mason8ad6fca2010-03-18 12:23:10 -04002241 key.offset = (u64)-1;
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002242
Dulshani Gunawardhana67871252013-10-31 10:33:04 +05302243 while (1) {
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002244 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2245 if (ret < 0)
2246 goto out;
Filipe David Borba Manana18674c62013-08-14 03:00:21 +01002247 else if (ret > 0) {
2248 ret = btrfs_previous_item(root, path, dirid,
2249 BTRFS_INODE_REF_KEY);
2250 if (ret < 0)
2251 goto out;
2252 else if (ret > 0) {
2253 ret = -ENOENT;
2254 goto out;
2255 }
2256 }
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002257
2258 l = path->nodes[0];
2259 slot = path->slots[0];
2260 btrfs_item_key_to_cpu(l, &key, slot);
2261
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002262 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2263 len = btrfs_inode_ref_name_len(l, iref);
2264 ptr -= len + 1;
2265 total_len += len + 1;
Filipe David Borba Mananaa696cf32013-08-14 03:00:20 +01002266 if (ptr < name) {
2267 ret = -ENAMETOOLONG;
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002268 goto out;
Filipe David Borba Mananaa696cf32013-08-14 03:00:20 +01002269 }
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002270
2271 *(ptr + len) = '/';
Dulshani Gunawardhana67871252013-10-31 10:33:04 +05302272 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002273
2274 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2275 break;
2276
David Sterbab3b4aa72011-04-21 01:20:15 +02002277 btrfs_release_path(path);
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002278 key.objectid = key.offset;
Chris Mason8ad6fca2010-03-18 12:23:10 -04002279 key.offset = (u64)-1;
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002280 dirid = key.objectid;
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002281 }
Li Zefan77906a502011-07-14 03:16:00 +00002282 memmove(name, ptr, total_len);
Dulshani Gunawardhana67871252013-10-31 10:33:04 +05302283 name[total_len] = '\0';
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002284 ret = 0;
2285out:
2286 btrfs_free_path(path);
Chris Masonac8e9812010-02-28 15:39:26 -05002287 return ret;
2288}
2289
2290static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2291 void __user *argp)
2292{
2293 struct btrfs_ioctl_ino_lookup_args *args;
2294 struct inode *inode;
2295 int ret;
2296
2297 if (!capable(CAP_SYS_ADMIN))
2298 return -EPERM;
2299
Julia Lawall2354d082010-10-29 15:14:18 -04002300 args = memdup_user(argp, sizeof(*args));
2301 if (IS_ERR(args))
2302 return PTR_ERR(args);
Dan Carpenterc2b96922010-03-20 11:24:15 +00002303
Al Viro496ad9a2013-01-23 17:07:38 -05002304 inode = file_inode(file);
Chris Masonac8e9812010-02-28 15:39:26 -05002305
Chris Mason1b53ac42010-03-18 12:17:05 -04002306 if (args->treeid == 0)
2307 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2308
Chris Masonac8e9812010-02-28 15:39:26 -05002309 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2310 args->treeid, args->objectid,
2311 args->name);
2312
2313 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2314 ret = -EFAULT;
2315
2316 kfree(args);
TARUISI Hiroaki98d377a2009-11-18 05:42:14 +00002317 return ret;
2318}
2319
Yan, Zheng76dda932009-09-21 16:00:26 -04002320static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2321 void __user *arg)
2322{
Al Viro54563d42013-09-01 15:57:51 -04002323 struct dentry *parent = file->f_path.dentry;
Yan, Zheng76dda932009-09-21 16:00:26 -04002324 struct dentry *dentry;
2325 struct inode *dir = parent->d_inode;
2326 struct inode *inode;
2327 struct btrfs_root *root = BTRFS_I(dir)->root;
2328 struct btrfs_root *dest = NULL;
2329 struct btrfs_ioctl_vol_args *vol_args;
2330 struct btrfs_trans_handle *trans;
Miao Xiec58aaad2013-02-28 10:05:36 +00002331 struct btrfs_block_rsv block_rsv;
David Sterba521e0542014-04-15 16:41:44 +02002332 u64 root_flags;
Miao Xiec58aaad2013-02-28 10:05:36 +00002333 u64 qgroup_reserved;
Yan, Zheng76dda932009-09-21 16:00:26 -04002334 int namelen;
2335 int ret;
2336 int err = 0;
2337
Yan, Zheng76dda932009-09-21 16:00:26 -04002338 vol_args = memdup_user(arg, sizeof(*vol_args));
2339 if (IS_ERR(vol_args))
2340 return PTR_ERR(vol_args);
2341
2342 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2343 namelen = strlen(vol_args->name);
2344 if (strchr(vol_args->name, '/') ||
2345 strncmp(vol_args->name, "..", namelen) == 0) {
2346 err = -EINVAL;
2347 goto out;
2348 }
2349
Al Viroa561be72011-11-23 11:57:51 -05002350 err = mnt_want_write_file(file);
Yan, Zheng76dda932009-09-21 16:00:26 -04002351 if (err)
2352 goto out;
2353
David Sterba521e0542014-04-15 16:41:44 +02002354
David Sterba5c50c9b2013-03-22 18:12:51 +00002355 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2356 if (err == -EINTR)
David Sterbae43f9982013-12-06 17:51:32 +01002357 goto out_drop_write;
Yan, Zheng76dda932009-09-21 16:00:26 -04002358 dentry = lookup_one_len(vol_args->name, parent, namelen);
2359 if (IS_ERR(dentry)) {
2360 err = PTR_ERR(dentry);
2361 goto out_unlock_dir;
2362 }
2363
2364 if (!dentry->d_inode) {
2365 err = -ENOENT;
2366 goto out_dput;
2367 }
2368
2369 inode = dentry->d_inode;
Sage Weil4260f7c2010-10-29 15:46:43 -04002370 dest = BTRFS_I(inode)->root;
Dulshani Gunawardhana67871252013-10-31 10:33:04 +05302371 if (!capable(CAP_SYS_ADMIN)) {
Sage Weil4260f7c2010-10-29 15:46:43 -04002372 /*
2373 * Regular user. Only allow this with a special mount
2374 * option, when the user has write+exec access to the
2375 * subvol root, and when rmdir(2) would have been
2376 * allowed.
2377 *
2378 * Note that this is _not_ check that the subvol is
2379 * empty or doesn't contain data that we wouldn't
2380 * otherwise be able to delete.
2381 *
2382 * Users who want to delete empty subvols should try
2383 * rmdir(2).
2384 */
2385 err = -EPERM;
2386 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2387 goto out_dput;
2388
2389 /*
2390 * Do not allow deletion if the parent dir is the same
2391 * as the dir to be deleted. That means the ioctl
2392 * must be called on the dentry referencing the root
2393 * of the subvol, not a random directory contained
2394 * within it.
2395 */
2396 err = -EINVAL;
2397 if (root == dest)
2398 goto out_dput;
2399
2400 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2401 if (err)
2402 goto out_dput;
Sage Weil4260f7c2010-10-29 15:46:43 -04002403 }
2404
Miao Xie5c39da52012-10-22 11:39:53 +00002405 /* check if subvolume may be deleted by a user */
2406 err = btrfs_may_delete(dir, dentry, 1);
2407 if (err)
2408 goto out_dput;
2409
Li Zefan33345d012011-04-20 10:31:50 +08002410 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
Yan, Zheng76dda932009-09-21 16:00:26 -04002411 err = -EINVAL;
2412 goto out_dput;
2413 }
2414
Yan, Zheng76dda932009-09-21 16:00:26 -04002415 mutex_lock(&inode->i_mutex);
David Sterba521e0542014-04-15 16:41:44 +02002416
2417 /*
2418 * Don't allow to delete a subvolume with send in progress. This is
2419 * inside the i_mutex so the error handling that has to drop the bit
2420 * again is not run concurrently.
2421 */
2422 spin_lock(&dest->root_item_lock);
Filipe Mananac55bfa62014-05-25 03:55:44 +01002423 root_flags = btrfs_root_flags(&dest->root_item);
2424 if (dest->send_in_progress == 0) {
2425 btrfs_set_root_flags(&dest->root_item,
David Sterba521e0542014-04-15 16:41:44 +02002426 root_flags | BTRFS_ROOT_SUBVOL_DEAD);
2427 spin_unlock(&dest->root_item_lock);
2428 } else {
2429 spin_unlock(&dest->root_item_lock);
2430 btrfs_warn(root->fs_info,
2431 "Attempt to delete subvolume %llu during send",
Filipe Mananac55bfa62014-05-25 03:55:44 +01002432 dest->root_key.objectid);
David Sterba521e0542014-04-15 16:41:44 +02002433 err = -EPERM;
2434 goto out_dput;
2435 }
2436
Eric W. Biederman5542aa22014-02-13 09:46:25 -08002437 d_invalidate(dentry);
Yan, Zheng76dda932009-09-21 16:00:26 -04002438
2439 down_write(&root->fs_info->subvol_sem);
2440
2441 err = may_destroy_subvol(dest);
2442 if (err)
2443 goto out_up_write;
2444
Miao Xiec58aaad2013-02-28 10:05:36 +00002445 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2446 /*
2447 * One for dir inode, two for dir entries, two for root
2448 * ref/backref.
2449 */
2450 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
Jeff Mahoneyee3441b2013-07-09 16:37:21 -04002451 5, &qgroup_reserved, true);
Miao Xiec58aaad2013-02-28 10:05:36 +00002452 if (err)
2453 goto out_up_write;
2454
Yan, Zhenga22285a2010-05-16 10:48:46 -04002455 trans = btrfs_start_transaction(root, 0);
2456 if (IS_ERR(trans)) {
2457 err = PTR_ERR(trans);
Miao Xiec58aaad2013-02-28 10:05:36 +00002458 goto out_release;
Yan, Zhenga22285a2010-05-16 10:48:46 -04002459 }
Miao Xiec58aaad2013-02-28 10:05:36 +00002460 trans->block_rsv = &block_rsv;
2461 trans->bytes_reserved = block_rsv.size;
Yan, Zhenga22285a2010-05-16 10:48:46 -04002462
Yan, Zheng76dda932009-09-21 16:00:26 -04002463 ret = btrfs_unlink_subvol(trans, root, dir,
2464 dest->root_key.objectid,
2465 dentry->d_name.name,
2466 dentry->d_name.len);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01002467 if (ret) {
2468 err = ret;
2469 btrfs_abort_transaction(trans, root, ret);
2470 goto out_end_trans;
2471 }
Yan, Zheng76dda932009-09-21 16:00:26 -04002472
2473 btrfs_record_root_in_trans(trans, dest);
2474
2475 memset(&dest->root_item.drop_progress, 0,
2476 sizeof(dest->root_item.drop_progress));
2477 dest->root_item.drop_level = 0;
2478 btrfs_set_root_refs(&dest->root_item, 0);
2479
Miao Xie27cdeb72014-04-02 19:51:05 +08002480 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
Yan, Zhengd68fc572010-05-16 10:49:58 -04002481 ret = btrfs_insert_orphan_item(trans,
2482 root->fs_info->tree_root,
2483 dest->root_key.objectid);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01002484 if (ret) {
2485 btrfs_abort_transaction(trans, root, ret);
2486 err = ret;
2487 goto out_end_trans;
2488 }
Yan, Zhengd68fc572010-05-16 10:49:58 -04002489 }
Stefan Behrensdd5f9612013-08-15 17:11:20 +02002490
2491 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2492 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2493 dest->root_key.objectid);
2494 if (ret && ret != -ENOENT) {
2495 btrfs_abort_transaction(trans, root, ret);
2496 err = ret;
2497 goto out_end_trans;
2498 }
2499 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2500 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2501 dest->root_item.received_uuid,
2502 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2503 dest->root_key.objectid);
2504 if (ret && ret != -ENOENT) {
2505 btrfs_abort_transaction(trans, root, ret);
2506 err = ret;
2507 goto out_end_trans;
2508 }
2509 }
2510
Jeff Mahoney79787ea2012-03-12 16:03:00 +01002511out_end_trans:
Miao Xiec58aaad2013-02-28 10:05:36 +00002512 trans->block_rsv = NULL;
2513 trans->bytes_reserved = 0;
Sage Weil531cb132010-10-29 15:41:32 -04002514 ret = btrfs_end_transaction(trans, root);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01002515 if (ret && !err)
2516 err = ret;
Yan, Zheng76dda932009-09-21 16:00:26 -04002517 inode->i_flags |= S_DEAD;
Miao Xiec58aaad2013-02-28 10:05:36 +00002518out_release:
2519 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
Yan, Zheng76dda932009-09-21 16:00:26 -04002520out_up_write:
2521 up_write(&root->fs_info->subvol_sem);
David Sterba521e0542014-04-15 16:41:44 +02002522 if (err) {
2523 spin_lock(&dest->root_item_lock);
Filipe Mananac55bfa62014-05-25 03:55:44 +01002524 root_flags = btrfs_root_flags(&dest->root_item);
2525 btrfs_set_root_flags(&dest->root_item,
David Sterba521e0542014-04-15 16:41:44 +02002526 root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
2527 spin_unlock(&dest->root_item_lock);
2528 }
Yan, Zheng76dda932009-09-21 16:00:26 -04002529 mutex_unlock(&inode->i_mutex);
2530 if (!err) {
Yan, Zhengefefb142009-10-09 09:25:16 -04002531 shrink_dcache_sb(root->fs_info->sb);
Yan, Zheng76dda932009-09-21 16:00:26 -04002532 btrfs_invalidate_inodes(dest);
2533 d_delete(dentry);
David Sterba61155aa2014-04-15 16:42:03 +02002534 ASSERT(dest->send_in_progress == 0);
Liu Bofa6ac872013-02-20 14:10:23 +00002535
2536 /* the last ref */
David Sterba57cdc8d2014-02-05 02:37:48 +01002537 if (dest->ino_cache_inode) {
2538 iput(dest->ino_cache_inode);
2539 dest->ino_cache_inode = NULL;
Liu Bofa6ac872013-02-20 14:10:23 +00002540 }
Yan, Zheng76dda932009-09-21 16:00:26 -04002541 }
2542out_dput:
2543 dput(dentry);
2544out_unlock_dir:
2545 mutex_unlock(&dir->i_mutex);
David Sterbae43f9982013-12-06 17:51:32 +01002546out_drop_write:
Al Viro2a79f172011-12-09 08:06:57 -05002547 mnt_drop_write_file(file);
Yan, Zheng76dda932009-09-21 16:00:26 -04002548out:
2549 kfree(vol_args);
2550 return err;
2551}
2552
Chris Mason1e701a32010-03-11 09:42:04 -05002553static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002554{
Al Viro496ad9a2013-01-23 17:07:38 -05002555 struct inode *inode = file_inode(file);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002556 struct btrfs_root *root = BTRFS_I(inode)->root;
Chris Mason1e701a32010-03-11 09:42:04 -05002557 struct btrfs_ioctl_defrag_range_args *range;
Yan Zhengc146afa2008-11-12 14:34:12 -05002558 int ret;
2559
Ilya Dryomov25122d12013-01-20 15:57:57 +02002560 ret = mnt_want_write_file(file);
2561 if (ret)
2562 return ret;
Li Zefanb83cc962010-12-20 16:04:08 +08002563
Ilya Dryomov25122d12013-01-20 15:57:57 +02002564 if (btrfs_root_readonly(root)) {
2565 ret = -EROFS;
2566 goto out;
Stefan Behrens5ac00ad2012-11-05 17:54:08 +01002567 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002568
2569 switch (inode->i_mode & S_IFMT) {
2570 case S_IFDIR:
Chris Masone441d542009-01-05 16:57:23 -05002571 if (!capable(CAP_SYS_ADMIN)) {
2572 ret = -EPERM;
2573 goto out;
2574 }
Eric Sandeende78b512013-01-31 18:21:12 +00002575 ret = btrfs_defrag_root(root);
Yan, Zheng8929ecfa2010-05-16 10:49:58 -04002576 if (ret)
2577 goto out;
Eric Sandeende78b512013-01-31 18:21:12 +00002578 ret = btrfs_defrag_root(root->fs_info->extent_root);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002579 break;
2580 case S_IFREG:
Chris Masone441d542009-01-05 16:57:23 -05002581 if (!(file->f_mode & FMODE_WRITE)) {
2582 ret = -EINVAL;
2583 goto out;
2584 }
Chris Mason1e701a32010-03-11 09:42:04 -05002585
2586 range = kzalloc(sizeof(*range), GFP_KERNEL);
2587 if (!range) {
2588 ret = -ENOMEM;
2589 goto out;
2590 }
2591
2592 if (argp) {
2593 if (copy_from_user(range, argp,
2594 sizeof(*range))) {
2595 ret = -EFAULT;
2596 kfree(range);
Dan Carpenter683be162010-03-20 11:24:48 +00002597 goto out;
Chris Mason1e701a32010-03-11 09:42:04 -05002598 }
2599 /* compression requires us to start the IO */
2600 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2601 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2602 range->extent_thresh = (u32)-1;
2603 }
2604 } else {
2605 /* the rest are all set to zero by kzalloc */
2606 range->len = (u64)-1;
2607 }
Al Viro496ad9a2013-01-23 17:07:38 -05002608 ret = btrfs_defrag_file(file_inode(file), file,
Chris Mason4cb53002011-05-24 15:35:30 -04002609 range, 0, 0);
2610 if (ret > 0)
2611 ret = 0;
Chris Mason1e701a32010-03-11 09:42:04 -05002612 kfree(range);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002613 break;
Yan, Zheng8929ecfa2010-05-16 10:49:58 -04002614 default:
2615 ret = -EINVAL;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002616 }
Chris Masone441d542009-01-05 16:57:23 -05002617out:
Ilya Dryomov25122d12013-01-20 15:57:57 +02002618 mnt_drop_write_file(file);
Chris Masone441d542009-01-05 16:57:23 -05002619 return ret;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002620}
2621
Christoph Hellwigb2950862008-12-02 09:54:17 -05002622static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002623{
2624 struct btrfs_ioctl_vol_args *vol_args;
2625 int ret;
2626
Chris Masone441d542009-01-05 16:57:23 -05002627 if (!capable(CAP_SYS_ADMIN))
2628 return -EPERM;
2629
Stefan Behrens5ac00ad2012-11-05 17:54:08 +01002630 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2631 1)) {
Anand Jaine57138b2013-08-21 11:44:48 +08002632 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02002633 }
2634
Stefan Behrens5ac00ad2012-11-05 17:54:08 +01002635 mutex_lock(&root->fs_info->volume_mutex);
Li Zefandae7b662009-04-08 15:06:54 +08002636 vol_args = memdup_user(arg, sizeof(*vol_args));
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02002637 if (IS_ERR(vol_args)) {
2638 ret = PTR_ERR(vol_args);
2639 goto out;
2640 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002641
Mark Fasheh5516e592008-07-24 12:20:14 -04002642 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002643 ret = btrfs_init_new_device(root, vol_args->name);
2644
Anand Jain43d20762014-07-01 00:58:56 +08002645 if (!ret)
2646 btrfs_info(root->fs_info, "disk added %s",vol_args->name);
2647
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002648 kfree(vol_args);
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02002649out:
2650 mutex_unlock(&root->fs_info->volume_mutex);
Stefan Behrens5ac00ad2012-11-05 17:54:08 +01002651 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002652 return ret;
2653}
2654
Miao Xieda249272012-11-26 08:44:50 +00002655static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002656{
Al Viro496ad9a2013-01-23 17:07:38 -05002657 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002658 struct btrfs_ioctl_vol_args *vol_args;
2659 int ret;
2660
Chris Masone441d542009-01-05 16:57:23 -05002661 if (!capable(CAP_SYS_ADMIN))
2662 return -EPERM;
2663
Miao Xieda249272012-11-26 08:44:50 +00002664 ret = mnt_want_write_file(file);
2665 if (ret)
2666 return ret;
Yan Zhengc146afa2008-11-12 14:34:12 -05002667
Li Zefandae7b662009-04-08 15:06:54 +08002668 vol_args = memdup_user(arg, sizeof(*vol_args));
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02002669 if (IS_ERR(vol_args)) {
2670 ret = PTR_ERR(vol_args);
Dan Carpenterc47ca322014-09-04 14:09:15 +03002671 goto err_drop;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02002672 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002673
Mark Fasheh5516e592008-07-24 12:20:14 -04002674 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002675
Anand Jain183860f2013-05-17 10:52:45 +00002676 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2677 1)) {
2678 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2679 goto out;
2680 }
2681
2682 mutex_lock(&root->fs_info->volume_mutex);
2683 ret = btrfs_rm_device(root, vol_args->name);
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02002684 mutex_unlock(&root->fs_info->volume_mutex);
Stefan Behrens5ac00ad2012-11-05 17:54:08 +01002685 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
Anand Jain183860f2013-05-17 10:52:45 +00002686
Anand Jainec95d492014-07-01 00:58:57 +08002687 if (!ret)
2688 btrfs_info(root->fs_info, "disk deleted %s",vol_args->name);
2689
Anand Jain183860f2013-05-17 10:52:45 +00002690out:
2691 kfree(vol_args);
Dan Carpenterc47ca322014-09-04 14:09:15 +03002692err_drop:
Ilya Dryomov4ac20c72013-01-20 15:57:57 +02002693 mnt_drop_write_file(file);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04002694 return ret;
2695}
2696
Jan Schmidt475f6382011-03-11 15:41:01 +01002697static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2698{
Li Zefan027ed2f2011-06-08 08:27:56 +00002699 struct btrfs_ioctl_fs_info_args *fi_args;
Jan Schmidt475f6382011-03-11 15:41:01 +01002700 struct btrfs_device *device;
2701 struct btrfs_device *next;
2702 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
Li Zefan027ed2f2011-06-08 08:27:56 +00002703 int ret = 0;
Jan Schmidt475f6382011-03-11 15:41:01 +01002704
Li Zefan027ed2f2011-06-08 08:27:56 +00002705 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2706 if (!fi_args)
2707 return -ENOMEM;
2708
Filipe David Borba Mananaf7171752013-08-12 20:56:58 +01002709 mutex_lock(&fs_devices->device_list_mutex);
Li Zefan027ed2f2011-06-08 08:27:56 +00002710 fi_args->num_devices = fs_devices->num_devices;
2711 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
Jan Schmidt475f6382011-03-11 15:41:01 +01002712
Jan Schmidt475f6382011-03-11 15:41:01 +01002713 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
Li Zefan027ed2f2011-06-08 08:27:56 +00002714 if (device->devid > fi_args->max_id)
2715 fi_args->max_id = device->devid;
Jan Schmidt475f6382011-03-11 15:41:01 +01002716 }
2717 mutex_unlock(&fs_devices->device_list_mutex);
2718
David Sterba80a773f2014-05-07 18:17:06 +02002719 fi_args->nodesize = root->fs_info->super_copy->nodesize;
2720 fi_args->sectorsize = root->fs_info->super_copy->sectorsize;
2721 fi_args->clone_alignment = root->fs_info->super_copy->sectorsize;
2722
Li Zefan027ed2f2011-06-08 08:27:56 +00002723 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2724 ret = -EFAULT;
Jan Schmidt475f6382011-03-11 15:41:01 +01002725
Li Zefan027ed2f2011-06-08 08:27:56 +00002726 kfree(fi_args);
2727 return ret;
Jan Schmidt475f6382011-03-11 15:41:01 +01002728}
2729
2730static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2731{
2732 struct btrfs_ioctl_dev_info_args *di_args;
2733 struct btrfs_device *dev;
2734 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2735 int ret = 0;
2736 char *s_uuid = NULL;
Jan Schmidt475f6382011-03-11 15:41:01 +01002737
Jan Schmidt475f6382011-03-11 15:41:01 +01002738 di_args = memdup_user(arg, sizeof(*di_args));
2739 if (IS_ERR(di_args))
2740 return PTR_ERR(di_args);
2741
Stefan Behrensdd5f9612013-08-15 17:11:20 +02002742 if (!btrfs_is_empty_uuid(di_args->uuid))
Jan Schmidt475f6382011-03-11 15:41:01 +01002743 s_uuid = di_args->uuid;
2744
2745 mutex_lock(&fs_devices->device_list_mutex);
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01002746 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
Jan Schmidt475f6382011-03-11 15:41:01 +01002747
2748 if (!dev) {
2749 ret = -ENODEV;
2750 goto out;
2751 }
2752
2753 di_args->devid = dev->devid;
Miao Xie7cc8e582014-09-03 21:35:38 +08002754 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
2755 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
Jan Schmidt475f6382011-03-11 15:41:01 +01002756 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
Jim Meyeringa27202f2012-04-26 18:36:56 +02002757 if (dev->name) {
Josef Bacik606686e2012-06-04 14:03:51 -04002758 struct rcu_string *name;
2759
2760 rcu_read_lock();
2761 name = rcu_dereference(dev->name);
2762 strncpy(di_args->path, name->str, sizeof(di_args->path));
2763 rcu_read_unlock();
Jim Meyeringa27202f2012-04-26 18:36:56 +02002764 di_args->path[sizeof(di_args->path) - 1] = 0;
2765 } else {
Stefan Behrens99ba55a2012-03-19 16:17:22 +01002766 di_args->path[0] = '\0';
Jim Meyeringa27202f2012-04-26 18:36:56 +02002767 }
Jan Schmidt475f6382011-03-11 15:41:01 +01002768
2769out:
David Sterba55793c02013-04-26 15:20:23 +00002770 mutex_unlock(&fs_devices->device_list_mutex);
Jan Schmidt475f6382011-03-11 15:41:01 +01002771 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2772 ret = -EFAULT;
2773
2774 kfree(di_args);
2775 return ret;
2776}
2777
Mark Fasheh416161d2013-08-06 11:42:51 -07002778static struct page *extent_same_get_page(struct inode *inode, u64 off)
2779{
2780 struct page *page;
2781 pgoff_t index;
2782 struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
2783
2784 index = off >> PAGE_CACHE_SHIFT;
2785
2786 page = grab_cache_page(inode->i_mapping, index);
2787 if (!page)
2788 return NULL;
2789
2790 if (!PageUptodate(page)) {
2791 if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
2792 0))
2793 return NULL;
2794 lock_page(page);
2795 if (!PageUptodate(page)) {
2796 unlock_page(page);
2797 page_cache_release(page);
2798 return NULL;
2799 }
2800 }
2801 unlock_page(page);
2802
2803 return page;
2804}
2805
Mark Fasheh77fe20dc2013-08-06 11:42:48 -07002806static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
2807{
2808 /* do any pending delalloc/csum calc on src, one way or
2809 another, and lock file content */
2810 while (1) {
2811 struct btrfs_ordered_extent *ordered;
2812 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2813 ordered = btrfs_lookup_first_ordered_extent(inode,
2814 off + len - 1);
Filipe Mananaff5df9b2014-05-30 17:56:24 +01002815 if ((!ordered ||
2816 ordered->file_offset + ordered->len <= off ||
2817 ordered->file_offset >= off + len) &&
Mark Fasheh77fe20dc2013-08-06 11:42:48 -07002818 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
Filipe Mananaff5df9b2014-05-30 17:56:24 +01002819 off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
2820 if (ordered)
2821 btrfs_put_ordered_extent(ordered);
Mark Fasheh77fe20dc2013-08-06 11:42:48 -07002822 break;
Filipe Mananaff5df9b2014-05-30 17:56:24 +01002823 }
Mark Fasheh77fe20dc2013-08-06 11:42:48 -07002824 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2825 if (ordered)
2826 btrfs_put_ordered_extent(ordered);
2827 btrfs_wait_ordered_range(inode, off, len);
2828 }
2829}
2830
Mark Fasheh416161d2013-08-06 11:42:51 -07002831static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
2832 struct inode *inode2, u64 loff2, u64 len)
2833{
2834 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2835 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2836
2837 mutex_unlock(&inode1->i_mutex);
2838 mutex_unlock(&inode2->i_mutex);
2839}
2840
2841static void btrfs_double_lock(struct inode *inode1, u64 loff1,
2842 struct inode *inode2, u64 loff2, u64 len)
2843{
2844 if (inode1 < inode2) {
2845 swap(inode1, inode2);
2846 swap(loff1, loff2);
2847 }
2848
2849 mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
2850 lock_extent_range(inode1, loff1, len);
2851 if (inode1 != inode2) {
2852 mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
2853 lock_extent_range(inode2, loff2, len);
2854 }
2855}
2856
2857static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2858 u64 dst_loff, u64 len)
2859{
2860 int ret = 0;
2861 struct page *src_page, *dst_page;
2862 unsigned int cmp_len = PAGE_CACHE_SIZE;
2863 void *addr, *dst_addr;
2864
2865 while (len) {
2866 if (len < PAGE_CACHE_SIZE)
2867 cmp_len = len;
2868
2869 src_page = extent_same_get_page(src, loff);
2870 if (!src_page)
2871 return -EINVAL;
2872 dst_page = extent_same_get_page(dst, dst_loff);
2873 if (!dst_page) {
2874 page_cache_release(src_page);
2875 return -EINVAL;
2876 }
2877 addr = kmap_atomic(src_page);
2878 dst_addr = kmap_atomic(dst_page);
2879
2880 flush_dcache_page(src_page);
2881 flush_dcache_page(dst_page);
2882
2883 if (memcmp(addr, dst_addr, cmp_len))
2884 ret = BTRFS_SAME_DATA_DIFFERS;
2885
2886 kunmap_atomic(addr);
2887 kunmap_atomic(dst_addr);
2888 page_cache_release(src_page);
2889 page_cache_release(dst_page);
2890
2891 if (ret)
2892 break;
2893
2894 loff += cmp_len;
2895 dst_loff += cmp_len;
2896 len -= cmp_len;
2897 }
2898
2899 return ret;
2900}
2901
2902static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
2903{
2904 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
2905
2906 if (off + len > inode->i_size || off + len < off)
2907 return -EINVAL;
2908 /* Check that we are block aligned - btrfs_clone() requires this */
2909 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
2910 return -EINVAL;
2911
2912 return 0;
2913}
2914
2915static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
2916 struct inode *dst, u64 dst_loff)
2917{
2918 int ret;
2919
2920 /*
2921 * btrfs_clone() can't handle extents in the same file
2922 * yet. Once that works, we can drop this check and replace it
2923 * with a check for the same inode, but overlapping extents.
2924 */
2925 if (src == dst)
2926 return -EINVAL;
2927
2928 btrfs_double_lock(src, loff, dst, dst_loff, len);
2929
2930 ret = extent_same_check_offsets(src, loff, len);
2931 if (ret)
2932 goto out_unlock;
2933
2934 ret = extent_same_check_offsets(dst, dst_loff, len);
2935 if (ret)
2936 goto out_unlock;
2937
2938 /* don't make the dst file partly checksummed */
2939 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2940 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
2941 ret = -EINVAL;
2942 goto out_unlock;
2943 }
2944
2945 ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
2946 if (ret == 0)
2947 ret = btrfs_clone(src, dst, loff, len, len, dst_loff);
2948
2949out_unlock:
2950 btrfs_double_unlock(src, loff, dst, dst_loff, len);
2951
2952 return ret;
2953}
2954
2955#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2956
2957static long btrfs_ioctl_file_extent_same(struct file *file,
Al Viro1c1c8742013-12-11 23:07:51 -05002958 struct btrfs_ioctl_same_args __user *argp)
Mark Fasheh416161d2013-08-06 11:42:51 -07002959{
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07002960 struct btrfs_ioctl_same_args *same;
2961 struct btrfs_ioctl_same_extent_info *info;
Al Viro1c1c8742013-12-11 23:07:51 -05002962 struct inode *src = file_inode(file);
Mark Fasheh416161d2013-08-06 11:42:51 -07002963 u64 off;
2964 u64 len;
2965 int i;
2966 int ret;
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07002967 unsigned long size;
Mark Fasheh416161d2013-08-06 11:42:51 -07002968 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
2969 bool is_admin = capable(CAP_SYS_ADMIN);
Al Viro1c1c8742013-12-11 23:07:51 -05002970 u16 count;
Mark Fasheh416161d2013-08-06 11:42:51 -07002971
2972 if (!(file->f_mode & FMODE_READ))
2973 return -EINVAL;
2974
2975 ret = mnt_want_write_file(file);
2976 if (ret)
2977 return ret;
2978
Al Viro1c1c8742013-12-11 23:07:51 -05002979 if (get_user(count, &argp->dest_count)) {
Mark Fasheh416161d2013-08-06 11:42:51 -07002980 ret = -EFAULT;
2981 goto out;
2982 }
2983
Al Viro1c1c8742013-12-11 23:07:51 -05002984 size = offsetof(struct btrfs_ioctl_same_args __user, info[count]);
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07002985
Al Viro1c1c8742013-12-11 23:07:51 -05002986 same = memdup_user(argp, size);
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07002987
Geyslan G. Bem229eed42013-10-14 12:18:25 -03002988 if (IS_ERR(same)) {
2989 ret = PTR_ERR(same);
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07002990 goto out;
2991 }
2992
2993 off = same->logical_offset;
2994 len = same->length;
Mark Fasheh416161d2013-08-06 11:42:51 -07002995
2996 /*
2997 * Limit the total length we will dedupe for each operation.
2998 * This is intended to bound the total time spent in this
2999 * ioctl to something sane.
3000 */
3001 if (len > BTRFS_MAX_DEDUPE_LEN)
3002 len = BTRFS_MAX_DEDUPE_LEN;
3003
3004 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
3005 /*
3006 * Btrfs does not support blocksize < page_size. As a
3007 * result, btrfs_cmp_data() won't correctly handle
3008 * this situation without an update.
3009 */
3010 ret = -EINVAL;
3011 goto out;
3012 }
3013
3014 ret = -EISDIR;
3015 if (S_ISDIR(src->i_mode))
3016 goto out;
3017
3018 ret = -EACCES;
3019 if (!S_ISREG(src->i_mode))
3020 goto out;
3021
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07003022 /* pre-format output fields to sane values */
Al Viro1c1c8742013-12-11 23:07:51 -05003023 for (i = 0; i < count; i++) {
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07003024 same->info[i].bytes_deduped = 0ULL;
3025 same->info[i].status = 0;
3026 }
3027
Al Viro1c1c8742013-12-11 23:07:51 -05003028 for (i = 0, info = same->info; i < count; i++, info++) {
3029 struct inode *dst;
3030 struct fd dst_file = fdget(info->fd);
3031 if (!dst_file.file) {
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07003032 info->status = -EBADF;
Al Viro1c1c8742013-12-11 23:07:51 -05003033 continue;
Mark Fasheh416161d2013-08-06 11:42:51 -07003034 }
Al Viro1c1c8742013-12-11 23:07:51 -05003035 dst = file_inode(dst_file.file);
Mark Fasheh416161d2013-08-06 11:42:51 -07003036
Al Viro1c1c8742013-12-11 23:07:51 -05003037 if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) {
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07003038 info->status = -EINVAL;
Al Viro1c1c8742013-12-11 23:07:51 -05003039 } else if (file->f_path.mnt != dst_file.file->f_path.mnt) {
3040 info->status = -EXDEV;
3041 } else if (S_ISDIR(dst->i_mode)) {
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07003042 info->status = -EISDIR;
Al Viro1c1c8742013-12-11 23:07:51 -05003043 } else if (!S_ISREG(dst->i_mode)) {
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07003044 info->status = -EACCES;
Al Viro1c1c8742013-12-11 23:07:51 -05003045 } else {
3046 info->status = btrfs_extent_same(src, off, len, dst,
3047 info->logical_offset);
3048 if (info->status == 0)
3049 info->bytes_deduped += len;
Mark Fasheh416161d2013-08-06 11:42:51 -07003050 }
Al Viro1c1c8742013-12-11 23:07:51 -05003051 fdput(dst_file);
Mark Fasheh416161d2013-08-06 11:42:51 -07003052 }
3053
Mark Fashehcbf8b8c2013-09-17 15:43:54 -07003054 ret = copy_to_user(argp, same, size);
3055 if (ret)
3056 ret = -EFAULT;
3057
Mark Fasheh416161d2013-08-06 11:42:51 -07003058out:
3059 mnt_drop_write_file(file);
3060 return ret;
3061}
3062
Josef Bacikfcebe452014-05-13 17:30:47 -07003063/* Helper to check and see if this root currently has a ref on the given disk
3064 * bytenr. If it does then we need to update the quota for this root. This
3065 * doesn't do anything if quotas aren't enabled.
3066 */
3067static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3068 u64 disko)
3069{
3070 struct seq_list tree_mod_seq_elem = {};
3071 struct ulist *roots;
3072 struct ulist_iterator uiter;
3073 struct ulist_node *root_node = NULL;
3074 int ret;
3075
3076 if (!root->fs_info->quota_enabled)
3077 return 1;
3078
3079 btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem);
3080 ret = btrfs_find_all_roots(trans, root->fs_info, disko,
3081 tree_mod_seq_elem.seq, &roots);
3082 if (ret < 0)
3083 goto out;
3084 ret = 0;
3085 ULIST_ITER_INIT(&uiter);
3086 while ((root_node = ulist_next(roots, &uiter))) {
3087 if (root_node->val == root->objectid) {
3088 ret = 1;
3089 break;
3090 }
3091 }
3092 ulist_free(roots);
3093out:
3094 btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem);
3095 return ret;
3096}
3097
Filipe Mananaf82a9902014-06-01 01:50:28 +01003098static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3099 struct inode *inode,
3100 u64 endoff,
3101 const u64 destoff,
3102 const u64 olen)
3103{
3104 struct btrfs_root *root = BTRFS_I(inode)->root;
3105 int ret;
3106
3107 inode_inc_iversion(inode);
3108 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3109 /*
3110 * We round up to the block size at eof when determining which
3111 * extents to clone above, but shouldn't round up the file size.
3112 */
3113 if (endoff > destoff + olen)
3114 endoff = destoff + olen;
3115 if (endoff > inode->i_size)
3116 btrfs_i_size_write(inode, endoff);
3117
3118 ret = btrfs_update_inode(trans, root, inode);
3119 if (ret) {
3120 btrfs_abort_transaction(trans, root, ret);
3121 btrfs_end_transaction(trans, root);
3122 goto out;
3123 }
3124 ret = btrfs_end_transaction(trans, root);
3125out:
3126 return ret;
3127}
3128
Filipe Manana7ffbb592014-06-09 03:48:05 +01003129static void clone_update_extent_map(struct inode *inode,
3130 const struct btrfs_trans_handle *trans,
3131 const struct btrfs_path *path,
Filipe Manana7ffbb592014-06-09 03:48:05 +01003132 const u64 hole_offset,
3133 const u64 hole_len)
3134{
3135 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
3136 struct extent_map *em;
3137 int ret;
3138
3139 em = alloc_extent_map();
3140 if (!em) {
3141 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3142 &BTRFS_I(inode)->runtime_flags);
3143 return;
3144 }
3145
Filipe Manana14f59792014-06-29 21:45:40 +01003146 if (path) {
3147 struct btrfs_file_extent_item *fi;
3148
3149 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3150 struct btrfs_file_extent_item);
Filipe Manana7ffbb592014-06-09 03:48:05 +01003151 btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
3152 em->generation = -1;
3153 if (btrfs_file_extent_type(path->nodes[0], fi) ==
3154 BTRFS_FILE_EXTENT_INLINE)
3155 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3156 &BTRFS_I(inode)->runtime_flags);
3157 } else {
3158 em->start = hole_offset;
3159 em->len = hole_len;
3160 em->ram_bytes = em->len;
3161 em->orig_start = hole_offset;
3162 em->block_start = EXTENT_MAP_HOLE;
3163 em->block_len = 0;
3164 em->orig_block_len = 0;
3165 em->compress_type = BTRFS_COMPRESS_NONE;
3166 em->generation = trans->transid;
3167 }
3168
3169 while (1) {
3170 write_lock(&em_tree->lock);
3171 ret = add_extent_mapping(em_tree, em, 1);
3172 write_unlock(&em_tree->lock);
3173 if (ret != -EEXIST) {
3174 free_extent_map(em);
3175 break;
3176 }
3177 btrfs_drop_extent_cache(inode, em->start,
3178 em->start + em->len - 1, 0);
3179 }
3180
David Sterbaee39b432014-09-30 01:33:33 +02003181 if (ret)
Filipe Manana7ffbb592014-06-09 03:48:05 +01003182 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3183 &BTRFS_I(inode)->runtime_flags);
3184}
3185
Mark Fasheh32b7c682013-08-06 11:42:49 -07003186/**
3187 * btrfs_clone() - clone a range from inode file to another
3188 *
3189 * @src: Inode to clone from
3190 * @inode: Inode to clone to
3191 * @off: Offset within source to start clone from
3192 * @olen: Original length, passed by user, of range to clone
3193 * @olen_aligned: Block-aligned value of olen, extent_same uses
3194 * identical values here
3195 * @destoff: Offset within @inode to start clone
3196 */
3197static int btrfs_clone(struct inode *src, struct inode *inode,
Filipe Mananaf82a9902014-06-01 01:50:28 +01003198 const u64 off, const u64 olen, const u64 olen_aligned,
3199 const u64 destoff)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003200{
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003201 struct btrfs_root *root = BTRFS_I(inode)->root;
Mark Fasheh32b7c682013-08-06 11:42:49 -07003202 struct btrfs_path *path = NULL;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003203 struct extent_buffer *leaf;
Mark Fasheh32b7c682013-08-06 11:42:49 -07003204 struct btrfs_trans_handle *trans;
3205 char *buf = NULL;
Yan Zhengae01a0a2008-08-04 23:23:47 -04003206 struct btrfs_key key;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003207 u32 nritems;
3208 int slot;
Yan Zhengae01a0a2008-08-04 23:23:47 -04003209 int ret;
Josef Bacikfcebe452014-05-13 17:30:47 -07003210 int no_quota;
Filipe Mananaf82a9902014-06-01 01:50:28 +01003211 const u64 len = olen_aligned;
Josef Bacikfcebe452014-05-13 17:30:47 -07003212 u64 last_disko = 0;
Filipe Mananaf82a9902014-06-01 01:50:28 +01003213 u64 last_dest_end = destoff;
Yan Zhengae01a0a2008-08-04 23:23:47 -04003214
3215 ret = -ENOMEM;
David Sterba707e8a02014-06-04 19:22:26 +02003216 buf = vmalloc(root->nodesize);
Yan Zhengae01a0a2008-08-04 23:23:47 -04003217 if (!buf)
Mark Fasheh32b7c682013-08-06 11:42:49 -07003218 return ret;
Yan Zhengae01a0a2008-08-04 23:23:47 -04003219
3220 path = btrfs_alloc_path();
3221 if (!path) {
3222 vfree(buf);
Mark Fasheh32b7c682013-08-06 11:42:49 -07003223 return ret;
Yan Zhengae01a0a2008-08-04 23:23:47 -04003224 }
Mark Fasheh32b7c682013-08-06 11:42:49 -07003225
Yan Zhengae01a0a2008-08-04 23:23:47 -04003226 path->reada = 2;
Sage Weilc5c9cd42008-11-12 14:32:25 -05003227 /* clone data */
Li Zefan33345d012011-04-20 10:31:50 +08003228 key.objectid = btrfs_ino(src);
Yan Zhengae01a0a2008-08-04 23:23:47 -04003229 key.type = BTRFS_EXTENT_DATA_KEY;
Filipe Manana2c463822014-05-31 02:31:05 +01003230 key.offset = off;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003231
3232 while (1) {
3233 /*
3234 * note the key will change type as we walk through the
3235 * tree.
3236 */
Filipe David Borba Mananae4355f32014-01-13 19:35:01 +00003237 path->leave_spinning = 1;
David Sterba362a20c2011-08-01 18:11:57 +02003238 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3239 0, 0);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003240 if (ret < 0)
3241 goto out;
Filipe Manana2c463822014-05-31 02:31:05 +01003242 /*
3243 * First search, if no extent item that starts at offset off was
3244 * found but the previous item is an extent item, it's possible
3245 * it might overlap our target range, therefore process it.
3246 */
3247 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3248 btrfs_item_key_to_cpu(path->nodes[0], &key,
3249 path->slots[0] - 1);
3250 if (key.type == BTRFS_EXTENT_DATA_KEY)
3251 path->slots[0]--;
3252 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003253
Yan Zhengae01a0a2008-08-04 23:23:47 -04003254 nritems = btrfs_header_nritems(path->nodes[0]);
Filipe David Borba Mananae4355f32014-01-13 19:35:01 +00003255process_slot:
Josef Bacikfcebe452014-05-13 17:30:47 -07003256 no_quota = 1;
Yan Zhengae01a0a2008-08-04 23:23:47 -04003257 if (path->slots[0] >= nritems) {
David Sterba362a20c2011-08-01 18:11:57 +02003258 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003259 if (ret < 0)
3260 goto out;
3261 if (ret > 0)
3262 break;
Yan Zhengae01a0a2008-08-04 23:23:47 -04003263 nritems = btrfs_header_nritems(path->nodes[0]);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003264 }
3265 leaf = path->nodes[0];
3266 slot = path->slots[0];
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003267
Yan Zhengae01a0a2008-08-04 23:23:47 -04003268 btrfs_item_key_to_cpu(leaf, &key, slot);
David Sterba962a2982014-06-04 18:41:45 +02003269 if (key.type > BTRFS_EXTENT_DATA_KEY ||
Li Zefan33345d012011-04-20 10:31:50 +08003270 key.objectid != btrfs_ino(src))
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003271 break;
3272
David Sterba962a2982014-06-04 18:41:45 +02003273 if (key.type == BTRFS_EXTENT_DATA_KEY) {
Sage Weilc5c9cd42008-11-12 14:32:25 -05003274 struct btrfs_file_extent_item *extent;
3275 int type;
Zheng Yan31840ae2008-09-23 13:14:14 -04003276 u32 size;
3277 struct btrfs_key new_key;
Sage Weilc5c9cd42008-11-12 14:32:25 -05003278 u64 disko = 0, diskl = 0;
3279 u64 datao = 0, datal = 0;
3280 u8 comp;
Filipe Mananaf82a9902014-06-01 01:50:28 +01003281 u64 drop_start;
Zheng Yan31840ae2008-09-23 13:14:14 -04003282
Sage Weilc5c9cd42008-11-12 14:32:25 -05003283 extent = btrfs_item_ptr(leaf, slot,
3284 struct btrfs_file_extent_item);
3285 comp = btrfs_file_extent_compression(leaf, extent);
3286 type = btrfs_file_extent_type(leaf, extent);
Chris Masonc8a894d2009-06-27 21:07:03 -04003287 if (type == BTRFS_FILE_EXTENT_REG ||
3288 type == BTRFS_FILE_EXTENT_PREALLOC) {
Chris Masond3977122009-01-05 21:25:51 -05003289 disko = btrfs_file_extent_disk_bytenr(leaf,
3290 extent);
3291 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3292 extent);
Sage Weilc5c9cd42008-11-12 14:32:25 -05003293 datao = btrfs_file_extent_offset(leaf, extent);
Chris Masond3977122009-01-05 21:25:51 -05003294 datal = btrfs_file_extent_num_bytes(leaf,
3295 extent);
Sage Weilc5c9cd42008-11-12 14:32:25 -05003296 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3297 /* take upper bound, may be compressed */
3298 datal = btrfs_file_extent_ram_bytes(leaf,
3299 extent);
3300 }
Zheng Yan31840ae2008-09-23 13:14:14 -04003301
Filipe Manana2c463822014-05-31 02:31:05 +01003302 /*
3303 * The first search might have left us at an extent
3304 * item that ends before our target range's start, can
3305 * happen if we have holes and NO_HOLES feature enabled.
3306 */
3307 if (key.offset + datal <= off) {
Filipe David Borba Mananae4355f32014-01-13 19:35:01 +00003308 path->slots[0]++;
3309 goto process_slot;
Filipe Manana2c463822014-05-31 02:31:05 +01003310 } else if (key.offset >= off + len) {
3311 break;
Filipe David Borba Mananae4355f32014-01-13 19:35:01 +00003312 }
3313
3314 size = btrfs_item_size_nr(leaf, slot);
3315 read_extent_buffer(leaf, buf,
3316 btrfs_item_ptr_offset(leaf, slot),
3317 size);
3318
3319 btrfs_release_path(path);
3320 path->leave_spinning = 0;
Sage Weilc5c9cd42008-11-12 14:32:25 -05003321
Zheng Yan31840ae2008-09-23 13:14:14 -04003322 memcpy(&new_key, &key, sizeof(new_key));
Li Zefan33345d012011-04-20 10:31:50 +08003323 new_key.objectid = btrfs_ino(inode);
Li Zefan4d728ec2011-01-26 14:10:43 +08003324 if (off <= key.offset)
3325 new_key.offset = key.offset + destoff - off;
3326 else
3327 new_key.offset = destoff;
Sage Weilc5c9cd42008-11-12 14:32:25 -05003328
Sage Weilb6f34092011-09-20 14:48:51 -04003329 /*
Filipe Mananaf82a9902014-06-01 01:50:28 +01003330 * Deal with a hole that doesn't have an extent item
3331 * that represents it (NO_HOLES feature enabled).
3332 * This hole is either in the middle of the cloning
3333 * range or at the beginning (fully overlaps it or
3334 * partially overlaps it).
3335 */
3336 if (new_key.offset != last_dest_end)
3337 drop_start = last_dest_end;
3338 else
3339 drop_start = new_key.offset;
3340
3341 /*
Sage Weilb6f34092011-09-20 14:48:51 -04003342 * 1 - adjusting old extent (we may have to split it)
3343 * 1 - add new extent
3344 * 1 - inode update
3345 */
3346 trans = btrfs_start_transaction(root, 3);
Yan, Zhenga22285a2010-05-16 10:48:46 -04003347 if (IS_ERR(trans)) {
3348 ret = PTR_ERR(trans);
3349 goto out;
3350 }
3351
Chris Masonc8a894d2009-06-27 21:07:03 -04003352 if (type == BTRFS_FILE_EXTENT_REG ||
3353 type == BTRFS_FILE_EXTENT_PREALLOC) {
Li Zefand72c0842011-09-11 10:52:25 -04003354 /*
3355 * a | --- range to clone ---| b
3356 * | ------------- extent ------------- |
3357 */
3358
Antonio Ospite93915582014-06-04 14:03:48 +02003359 /* subtract range b */
Li Zefand72c0842011-09-11 10:52:25 -04003360 if (key.offset + datal > off + len)
3361 datal = off + len - key.offset;
3362
Antonio Ospite93915582014-06-04 14:03:48 +02003363 /* subtract range a */
Yan, Zhenga22285a2010-05-16 10:48:46 -04003364 if (off > key.offset) {
3365 datao += off - key.offset;
3366 datal -= off - key.offset;
3367 }
3368
Josef Bacik5dc562c2012-08-17 13:14:17 -04003369 ret = btrfs_drop_extents(trans, root, inode,
Filipe Mananaf82a9902014-06-01 01:50:28 +01003370 drop_start,
Yan, Zhenga22285a2010-05-16 10:48:46 -04003371 new_key.offset + datal,
Josef Bacik26714852012-08-29 12:24:27 -04003372 1);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003373 if (ret) {
David Sterba3f9e3df2014-04-15 18:50:17 +02003374 if (ret != -EOPNOTSUPP)
Liu Bo00fdf132014-03-10 18:56:07 +08003375 btrfs_abort_transaction(trans,
3376 root, ret);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003377 btrfs_end_transaction(trans, root);
3378 goto out;
3379 }
Yan, Zhenga22285a2010-05-16 10:48:46 -04003380
Sage Weilc5c9cd42008-11-12 14:32:25 -05003381 ret = btrfs_insert_empty_item(trans, root, path,
3382 &new_key, size);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003383 if (ret) {
3384 btrfs_abort_transaction(trans, root,
3385 ret);
3386 btrfs_end_transaction(trans, root);
3387 goto out;
3388 }
Sage Weilc5c9cd42008-11-12 14:32:25 -05003389
3390 leaf = path->nodes[0];
3391 slot = path->slots[0];
3392 write_extent_buffer(leaf, buf,
3393 btrfs_item_ptr_offset(leaf, slot),
3394 size);
3395
3396 extent = btrfs_item_ptr(leaf, slot,
3397 struct btrfs_file_extent_item);
Sage Weilc5c9cd42008-11-12 14:32:25 -05003398
Sage Weilc5c9cd42008-11-12 14:32:25 -05003399 /* disko == 0 means it's a hole */
3400 if (!disko)
3401 datao = 0;
Sage Weilc5c9cd42008-11-12 14:32:25 -05003402
3403 btrfs_set_file_extent_offset(leaf, extent,
3404 datao);
3405 btrfs_set_file_extent_num_bytes(leaf, extent,
3406 datal);
Josef Bacikfcebe452014-05-13 17:30:47 -07003407
3408 /*
3409 * We need to look up the roots that point at
3410 * this bytenr and see if the new root does. If
3411 * it does not we need to make sure we update
3412 * quotas appropriately.
3413 */
3414 if (disko && root != BTRFS_I(src)->root &&
3415 disko != last_disko) {
3416 no_quota = check_ref(trans, root,
3417 disko);
3418 if (no_quota < 0) {
3419 btrfs_abort_transaction(trans,
3420 root,
3421 ret);
3422 btrfs_end_transaction(trans,
3423 root);
3424 ret = no_quota;
3425 goto out;
3426 }
3427 }
3428
Sage Weilc5c9cd42008-11-12 14:32:25 -05003429 if (disko) {
3430 inode_add_bytes(inode, datal);
3431 ret = btrfs_inc_extent_ref(trans, root,
Yan Zheng5d4f98a2009-06-10 10:45:14 -04003432 disko, diskl, 0,
3433 root->root_key.objectid,
Li Zefan33345d012011-04-20 10:31:50 +08003434 btrfs_ino(inode),
Arne Jansen66d7e7f2011-09-12 15:26:38 +02003435 new_key.offset - datao,
Josef Bacikfcebe452014-05-13 17:30:47 -07003436 no_quota);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003437 if (ret) {
3438 btrfs_abort_transaction(trans,
3439 root,
3440 ret);
3441 btrfs_end_transaction(trans,
3442 root);
3443 goto out;
3444
3445 }
Sage Weilc5c9cd42008-11-12 14:32:25 -05003446 }
3447 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3448 u64 skip = 0;
3449 u64 trim = 0;
Liu Bod3ecfcd2014-05-09 10:01:02 +08003450 u64 aligned_end = 0;
3451
Sage Weilc5c9cd42008-11-12 14:32:25 -05003452 if (off > key.offset) {
3453 skip = off - key.offset;
3454 new_key.offset += skip;
3455 }
Chris Masond3977122009-01-05 21:25:51 -05003456
Liu Boaa42ffd2012-09-18 03:52:23 -06003457 if (key.offset + datal > off + len)
3458 trim = key.offset + datal - (off + len);
Chris Masond3977122009-01-05 21:25:51 -05003459
Sage Weilc5c9cd42008-11-12 14:32:25 -05003460 if (comp && (skip || trim)) {
Sage Weilc5c9cd42008-11-12 14:32:25 -05003461 ret = -EINVAL;
Yan, Zhenga22285a2010-05-16 10:48:46 -04003462 btrfs_end_transaction(trans, root);
Sage Weilc5c9cd42008-11-12 14:32:25 -05003463 goto out;
3464 }
3465 size -= skip + trim;
3466 datal -= skip + trim;
Yan, Zhenga22285a2010-05-16 10:48:46 -04003467
Liu Bod3ecfcd2014-05-09 10:01:02 +08003468 aligned_end = ALIGN(new_key.offset + datal,
3469 root->sectorsize);
Josef Bacik5dc562c2012-08-17 13:14:17 -04003470 ret = btrfs_drop_extents(trans, root, inode,
Filipe Mananaf82a9902014-06-01 01:50:28 +01003471 drop_start,
Liu Bod3ecfcd2014-05-09 10:01:02 +08003472 aligned_end,
Josef Bacik26714852012-08-29 12:24:27 -04003473 1);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003474 if (ret) {
David Sterba3f9e3df2014-04-15 18:50:17 +02003475 if (ret != -EOPNOTSUPP)
Chris Mason3a29bc02014-04-07 07:10:40 -07003476 btrfs_abort_transaction(trans,
3477 root, ret);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003478 btrfs_end_transaction(trans, root);
3479 goto out;
3480 }
Yan, Zhenga22285a2010-05-16 10:48:46 -04003481
Sage Weilc5c9cd42008-11-12 14:32:25 -05003482 ret = btrfs_insert_empty_item(trans, root, path,
3483 &new_key, size);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003484 if (ret) {
3485 btrfs_abort_transaction(trans, root,
3486 ret);
3487 btrfs_end_transaction(trans, root);
3488 goto out;
3489 }
Sage Weilc5c9cd42008-11-12 14:32:25 -05003490
3491 if (skip) {
Chris Masond3977122009-01-05 21:25:51 -05003492 u32 start =
3493 btrfs_file_extent_calc_inline_size(0);
Sage Weilc5c9cd42008-11-12 14:32:25 -05003494 memmove(buf+start, buf+start+skip,
3495 datal);
3496 }
3497
3498 leaf = path->nodes[0];
3499 slot = path->slots[0];
3500 write_extent_buffer(leaf, buf,
3501 btrfs_item_ptr_offset(leaf, slot),
3502 size);
3503 inode_add_bytes(inode, datal);
3504 }
3505
Filipe Manana7ffbb592014-06-09 03:48:05 +01003506 /* If we have an implicit hole (NO_HOLES feature). */
3507 if (drop_start < new_key.offset)
3508 clone_update_extent_map(inode, trans,
Filipe Manana14f59792014-06-29 21:45:40 +01003509 NULL, drop_start,
Filipe Manana7ffbb592014-06-09 03:48:05 +01003510 new_key.offset - drop_start);
3511
Filipe Manana14f59792014-06-29 21:45:40 +01003512 clone_update_extent_map(inode, trans, path, 0, 0);
Filipe Manana7ffbb592014-06-09 03:48:05 +01003513
Sage Weilc5c9cd42008-11-12 14:32:25 -05003514 btrfs_mark_buffer_dirty(leaf);
David Sterbab3b4aa72011-04-21 01:20:15 +02003515 btrfs_release_path(path);
Sage Weilc5c9cd42008-11-12 14:32:25 -05003516
Filipe Manana62e23902014-08-08 02:47:06 +01003517 last_dest_end = ALIGN(new_key.offset + datal,
3518 root->sectorsize);
Filipe Mananaf82a9902014-06-01 01:50:28 +01003519 ret = clone_finish_inode_update(trans, inode,
3520 last_dest_end,
3521 destoff, olen);
3522 if (ret)
Jeff Mahoney79787ea2012-03-12 16:03:00 +01003523 goto out;
Filipe Manana2c463822014-05-31 02:31:05 +01003524 if (new_key.offset + datal >= destoff + len)
3525 break;
Yan, Zhenga22285a2010-05-16 10:48:46 -04003526 }
David Sterbab3b4aa72011-04-21 01:20:15 +02003527 btrfs_release_path(path);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003528 key.offset++;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003529 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003530 ret = 0;
Mark Fasheh32b7c682013-08-06 11:42:49 -07003531
Filipe Mananaf82a9902014-06-01 01:50:28 +01003532 if (last_dest_end < destoff + len) {
3533 /*
3534 * We have an implicit hole (NO_HOLES feature is enabled) that
3535 * fully or partially overlaps our cloning range at its end.
3536 */
3537 btrfs_release_path(path);
3538
3539 /*
3540 * 1 - remove extent(s)
3541 * 1 - inode update
3542 */
3543 trans = btrfs_start_transaction(root, 2);
3544 if (IS_ERR(trans)) {
3545 ret = PTR_ERR(trans);
3546 goto out;
3547 }
3548 ret = btrfs_drop_extents(trans, root, inode,
3549 last_dest_end, destoff + len, 1);
3550 if (ret) {
3551 if (ret != -EOPNOTSUPP)
3552 btrfs_abort_transaction(trans, root, ret);
3553 btrfs_end_transaction(trans, root);
3554 goto out;
3555 }
Filipe Manana14f59792014-06-29 21:45:40 +01003556 clone_update_extent_map(inode, trans, NULL, last_dest_end,
3557 destoff + len - last_dest_end);
Filipe Mananaf82a9902014-06-01 01:50:28 +01003558 ret = clone_finish_inode_update(trans, inode, destoff + len,
3559 destoff, olen);
3560 }
3561
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003562out:
Mark Fasheh32b7c682013-08-06 11:42:49 -07003563 btrfs_free_path(path);
3564 vfree(buf);
3565 return ret;
3566}
3567
3568static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
3569 u64 off, u64 olen, u64 destoff)
3570{
Al Viro54563d42013-09-01 15:57:51 -04003571 struct inode *inode = file_inode(file);
Mark Fasheh32b7c682013-08-06 11:42:49 -07003572 struct btrfs_root *root = BTRFS_I(inode)->root;
3573 struct fd src_file;
3574 struct inode *src;
3575 int ret;
3576 u64 len = olen;
3577 u64 bs = root->fs_info->sb->s_blocksize;
3578 int same_inode = 0;
3579
3580 /*
3581 * TODO:
3582 * - split compressed inline extents. annoying: we need to
3583 * decompress into destination's address_space (the file offset
3584 * may change, so source mapping won't do), then recompress (or
3585 * otherwise reinsert) a subrange.
Liu Bo00fdf132014-03-10 18:56:07 +08003586 *
3587 * - split destination inode's inline extents. The inline extents can
3588 * be either compressed or non-compressed.
Mark Fasheh32b7c682013-08-06 11:42:49 -07003589 */
3590
3591 /* the destination must be opened for writing */
3592 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
3593 return -EINVAL;
3594
3595 if (btrfs_root_readonly(root))
3596 return -EROFS;
3597
3598 ret = mnt_want_write_file(file);
3599 if (ret)
3600 return ret;
3601
3602 src_file = fdget(srcfd);
3603 if (!src_file.file) {
3604 ret = -EBADF;
3605 goto out_drop_write;
3606 }
3607
3608 ret = -EXDEV;
3609 if (src_file.file->f_path.mnt != file->f_path.mnt)
3610 goto out_fput;
3611
3612 src = file_inode(src_file.file);
3613
3614 ret = -EINVAL;
3615 if (src == inode)
3616 same_inode = 1;
3617
3618 /* the src must be open for reading */
3619 if (!(src_file.file->f_mode & FMODE_READ))
3620 goto out_fput;
3621
3622 /* don't make the dst file partly checksummed */
3623 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3624 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3625 goto out_fput;
3626
3627 ret = -EISDIR;
3628 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3629 goto out_fput;
3630
3631 ret = -EXDEV;
3632 if (src->i_sb != inode->i_sb)
3633 goto out_fput;
3634
3635 if (!same_inode) {
3636 if (inode < src) {
3637 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
3638 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
3639 } else {
3640 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
3641 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
3642 }
3643 } else {
3644 mutex_lock(&src->i_mutex);
3645 }
3646
3647 /* determine range to clone */
3648 ret = -EINVAL;
3649 if (off + len > src->i_size || off + len < off)
3650 goto out_unlock;
3651 if (len == 0)
3652 olen = len = src->i_size - off;
3653 /* if we extend to eof, continue to block boundary */
3654 if (off + len == src->i_size)
3655 len = ALIGN(src->i_size, bs) - off;
3656
3657 /* verify the end result is block aligned */
3658 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3659 !IS_ALIGNED(destoff, bs))
3660 goto out_unlock;
3661
3662 /* verify if ranges are overlapped within the same file */
3663 if (same_inode) {
3664 if (destoff + len > off && destoff < off + len)
3665 goto out_unlock;
3666 }
3667
3668 if (destoff > inode->i_size) {
3669 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3670 if (ret)
3671 goto out_unlock;
3672 }
3673
Filipe Mananac125b8b2014-05-23 05:03:34 +01003674 /*
3675 * Lock the target range too. Right after we replace the file extent
3676 * items in the fs tree (which now point to the cloned data), we might
3677 * have a worker replace them with extent items relative to a write
3678 * operation that was issued before this clone operation (i.e. confront
3679 * with inode.c:btrfs_finish_ordered_io).
3680 */
3681 if (same_inode) {
3682 u64 lock_start = min_t(u64, off, destoff);
3683 u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
Mark Fasheh32b7c682013-08-06 11:42:49 -07003684
Filipe Mananac125b8b2014-05-23 05:03:34 +01003685 lock_extent_range(src, lock_start, lock_len);
3686 } else {
3687 lock_extent_range(src, off, len);
3688 lock_extent_range(inode, destoff, len);
3689 }
Mark Fasheh32b7c682013-08-06 11:42:49 -07003690
3691 ret = btrfs_clone(src, inode, off, olen, len, destoff);
3692
Filipe Mananac125b8b2014-05-23 05:03:34 +01003693 if (same_inode) {
3694 u64 lock_start = min_t(u64, off, destoff);
3695 u64 lock_end = max_t(u64, off, destoff) + len - 1;
3696
3697 unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end);
3698 } else {
3699 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
3700 unlock_extent(&BTRFS_I(inode)->io_tree, destoff,
3701 destoff + len - 1);
3702 }
3703 /*
3704 * Truncate page cache pages so that future reads will see the cloned
3705 * data immediately and not the previous data.
3706 */
3707 truncate_inode_pages_range(&inode->i_data, destoff,
3708 PAGE_CACHE_ALIGN(destoff + len) - 1);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003709out_unlock:
Filipe David Borba Mananac57c2b32014-01-11 21:31:25 +00003710 if (!same_inode) {
3711 if (inode < src) {
3712 mutex_unlock(&src->i_mutex);
3713 mutex_unlock(&inode->i_mutex);
3714 } else {
3715 mutex_unlock(&inode->i_mutex);
3716 mutex_unlock(&src->i_mutex);
3717 }
3718 } else {
3719 mutex_unlock(&src->i_mutex);
3720 }
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003721out_fput:
Al Viro2903ff02012-08-28 12:52:22 -04003722 fdput(src_file);
Yan Zhengab67b7c2008-12-19 10:58:39 -05003723out_drop_write:
Al Viro2a79f172011-12-09 08:06:57 -05003724 mnt_drop_write_file(file);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003725 return ret;
3726}
3727
Christoph Hellwig7a865e82008-12-02 09:52:24 -05003728static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
Sage Weilc5c9cd42008-11-12 14:32:25 -05003729{
3730 struct btrfs_ioctl_clone_range_args args;
3731
Christoph Hellwig7a865e82008-12-02 09:52:24 -05003732 if (copy_from_user(&args, argp, sizeof(args)))
Sage Weilc5c9cd42008-11-12 14:32:25 -05003733 return -EFAULT;
3734 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
3735 args.src_length, args.dest_offset);
3736}
3737
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003738/*
3739 * there are many ways the trans_start and trans_end ioctls can lead
3740 * to deadlocks. They should only be used by applications that
3741 * basically own the machine, and have a very in depth understanding
3742 * of all the possible deadlocks and enospc problems.
3743 */
Christoph Hellwigb2950862008-12-02 09:54:17 -05003744static long btrfs_ioctl_trans_start(struct file *file)
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003745{
Al Viro496ad9a2013-01-23 17:07:38 -05003746 struct inode *inode = file_inode(file);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003747 struct btrfs_root *root = BTRFS_I(inode)->root;
3748 struct btrfs_trans_handle *trans;
Sage Weil1ab86ae2009-09-29 18:38:44 -04003749 int ret;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003750
Sage Weil1ab86ae2009-09-29 18:38:44 -04003751 ret = -EPERM;
Christoph Hellwigdf5b5522008-06-11 21:53:58 -04003752 if (!capable(CAP_SYS_ADMIN))
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003753 goto out;
Sage Weil1ab86ae2009-09-29 18:38:44 -04003754
3755 ret = -EINPROGRESS;
3756 if (file->private_data)
3757 goto out;
Sage Weil9ca9ee02008-08-04 10:41:27 -04003758
Li Zefanb83cc962010-12-20 16:04:08 +08003759 ret = -EROFS;
3760 if (btrfs_root_readonly(root))
3761 goto out;
3762
Al Viroa561be72011-11-23 11:57:51 -05003763 ret = mnt_want_write_file(file);
Yan Zhengc146afa2008-11-12 14:34:12 -05003764 if (ret)
3765 goto out;
3766
Josef Bacika4abeea2011-04-11 17:25:13 -04003767 atomic_inc(&root->fs_info->open_ioctl_trans);
Sage Weil9ca9ee02008-08-04 10:41:27 -04003768
Sage Weil1ab86ae2009-09-29 18:38:44 -04003769 ret = -ENOMEM;
Josef Bacik7a7eaa42011-04-13 12:54:33 -04003770 trans = btrfs_start_ioctl_transaction(root);
Tsutomu Itohabd30bb2011-01-24 00:57:10 +00003771 if (IS_ERR(trans))
Sage Weil1ab86ae2009-09-29 18:38:44 -04003772 goto out_drop;
3773
3774 file->private_data = trans;
3775 return 0;
3776
3777out_drop:
Josef Bacika4abeea2011-04-11 17:25:13 -04003778 atomic_dec(&root->fs_info->open_ioctl_trans);
Al Viro2a79f172011-12-09 08:06:57 -05003779 mnt_drop_write_file(file);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003780out:
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04003781 return ret;
3782}
3783
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003784static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3785{
Al Viro496ad9a2013-01-23 17:07:38 -05003786 struct inode *inode = file_inode(file);
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003787 struct btrfs_root *root = BTRFS_I(inode)->root;
3788 struct btrfs_root *new_root;
3789 struct btrfs_dir_item *di;
3790 struct btrfs_trans_handle *trans;
3791 struct btrfs_path *path;
3792 struct btrfs_key location;
3793 struct btrfs_disk_key disk_key;
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003794 u64 objectid = 0;
3795 u64 dir_id;
Miao Xie3c04ce02012-11-26 08:43:07 +00003796 int ret;
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003797
3798 if (!capable(CAP_SYS_ADMIN))
3799 return -EPERM;
3800
Miao Xie3c04ce02012-11-26 08:43:07 +00003801 ret = mnt_want_write_file(file);
3802 if (ret)
3803 return ret;
3804
3805 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3806 ret = -EFAULT;
3807 goto out;
3808 }
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003809
3810 if (!objectid)
chandan1cecf572013-09-13 19:34:10 +05303811 objectid = BTRFS_FS_TREE_OBJECTID;
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003812
3813 location.objectid = objectid;
3814 location.type = BTRFS_ROOT_ITEM_KEY;
3815 location.offset = (u64)-1;
3816
3817 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
Miao Xie3c04ce02012-11-26 08:43:07 +00003818 if (IS_ERR(new_root)) {
3819 ret = PTR_ERR(new_root);
3820 goto out;
3821 }
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003822
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003823 path = btrfs_alloc_path();
Miao Xie3c04ce02012-11-26 08:43:07 +00003824 if (!path) {
3825 ret = -ENOMEM;
3826 goto out;
3827 }
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003828 path->leave_spinning = 1;
3829
3830 trans = btrfs_start_transaction(root, 1);
Tsutomu Itoh98d5dc12011-01-20 06:19:37 +00003831 if (IS_ERR(trans)) {
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003832 btrfs_free_path(path);
Miao Xie3c04ce02012-11-26 08:43:07 +00003833 ret = PTR_ERR(trans);
3834 goto out;
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003835 }
3836
David Sterba6c417612011-04-13 15:41:04 +02003837 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003838 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3839 dir_id, "default", 7, 1);
Dan Carpentercf1e99a2010-05-29 09:47:24 +00003840 if (IS_ERR_OR_NULL(di)) {
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003841 btrfs_free_path(path);
3842 btrfs_end_transaction(trans, root);
Frank Holtonefe120a2013-12-20 11:37:06 -05003843 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
3844 "item, this isn't going to work");
Miao Xie3c04ce02012-11-26 08:43:07 +00003845 ret = -ENOENT;
3846 goto out;
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003847 }
3848
3849 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3850 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3851 btrfs_mark_buffer_dirty(path->nodes[0]);
3852 btrfs_free_path(path);
3853
Mitch Harder2b0ce2c2012-07-24 11:58:43 -06003854 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003855 btrfs_end_transaction(trans, root);
Miao Xie3c04ce02012-11-26 08:43:07 +00003856out:
3857 mnt_drop_write_file(file);
3858 return ret;
Josef Bacik6ef5ed02009-12-11 21:11:29 +00003859}
3860
Stefan Behrens5af3e8c2012-08-01 18:56:49 +02003861void btrfs_get_block_group_info(struct list_head *groups_list,
3862 struct btrfs_ioctl_space_info *space)
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003863{
3864 struct btrfs_block_group_cache *block_group;
3865
3866 space->total_bytes = 0;
3867 space->used_bytes = 0;
3868 space->flags = 0;
3869 list_for_each_entry(block_group, groups_list, list) {
3870 space->flags = block_group->flags;
3871 space->total_bytes += block_group->key.offset;
3872 space->used_bytes +=
3873 btrfs_block_group_used(&block_group->item);
3874 }
3875}
3876
Eric Sandeen48a3b632013-04-25 20:41:01 +00003877static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
Josef Bacik1406e432010-01-13 18:19:06 +00003878{
3879 struct btrfs_ioctl_space_args space_args;
3880 struct btrfs_ioctl_space_info space;
3881 struct btrfs_ioctl_space_info *dest;
Chris Mason7fde62b2010-03-16 15:40:10 -04003882 struct btrfs_ioctl_space_info *dest_orig;
Daniel J Blueman13f26962011-04-11 15:56:31 +00003883 struct btrfs_ioctl_space_info __user *user_dest;
Josef Bacik1406e432010-01-13 18:19:06 +00003884 struct btrfs_space_info *info;
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003885 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3886 BTRFS_BLOCK_GROUP_SYSTEM,
3887 BTRFS_BLOCK_GROUP_METADATA,
3888 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3889 int num_types = 4;
Chris Mason7fde62b2010-03-16 15:40:10 -04003890 int alloc_size;
Josef Bacik1406e432010-01-13 18:19:06 +00003891 int ret = 0;
Dan Rosenberg51788b12011-02-14 16:04:23 -05003892 u64 slot_count = 0;
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003893 int i, c;
Josef Bacik1406e432010-01-13 18:19:06 +00003894
3895 if (copy_from_user(&space_args,
3896 (struct btrfs_ioctl_space_args __user *)arg,
3897 sizeof(space_args)))
3898 return -EFAULT;
3899
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003900 for (i = 0; i < num_types; i++) {
3901 struct btrfs_space_info *tmp;
3902
3903 info = NULL;
3904 rcu_read_lock();
3905 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3906 list) {
3907 if (tmp->flags == types[i]) {
3908 info = tmp;
3909 break;
3910 }
3911 }
3912 rcu_read_unlock();
3913
3914 if (!info)
3915 continue;
3916
3917 down_read(&info->groups_sem);
3918 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3919 if (!list_empty(&info->block_groups[c]))
3920 slot_count++;
3921 }
3922 up_read(&info->groups_sem);
3923 }
Josef Bacik1406e432010-01-13 18:19:06 +00003924
David Sterba36523e952014-02-07 14:34:12 +01003925 /*
3926 * Global block reserve, exported as a space_info
3927 */
3928 slot_count++;
3929
Chris Mason7fde62b2010-03-16 15:40:10 -04003930 /* space_slots == 0 means they are asking for a count */
3931 if (space_args.space_slots == 0) {
3932 space_args.total_spaces = slot_count;
3933 goto out;
3934 }
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003935
Dan Rosenberg51788b12011-02-14 16:04:23 -05003936 slot_count = min_t(u64, space_args.space_slots, slot_count);
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003937
Chris Mason7fde62b2010-03-16 15:40:10 -04003938 alloc_size = sizeof(*dest) * slot_count;
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003939
Chris Mason7fde62b2010-03-16 15:40:10 -04003940 /* we generally have at most 6 or so space infos, one for each raid
3941 * level. So, a whole page should be more than enough for everyone
3942 */
3943 if (alloc_size > PAGE_CACHE_SIZE)
3944 return -ENOMEM;
3945
3946 space_args.total_spaces = 0;
3947 dest = kmalloc(alloc_size, GFP_NOFS);
3948 if (!dest)
3949 return -ENOMEM;
3950 dest_orig = dest;
3951
3952 /* now we have a buffer to copy into */
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003953 for (i = 0; i < num_types; i++) {
3954 struct btrfs_space_info *tmp;
Chris Mason7fde62b2010-03-16 15:40:10 -04003955
Dan Rosenberg51788b12011-02-14 16:04:23 -05003956 if (!slot_count)
3957 break;
3958
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003959 info = NULL;
3960 rcu_read_lock();
3961 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3962 list) {
3963 if (tmp->flags == types[i]) {
3964 info = tmp;
3965 break;
3966 }
3967 }
3968 rcu_read_unlock();
Chris Mason7fde62b2010-03-16 15:40:10 -04003969
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003970 if (!info)
3971 continue;
3972 down_read(&info->groups_sem);
3973 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3974 if (!list_empty(&info->block_groups[c])) {
Stefan Behrens5af3e8c2012-08-01 18:56:49 +02003975 btrfs_get_block_group_info(
3976 &info->block_groups[c], &space);
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003977 memcpy(dest, &space, sizeof(space));
3978 dest++;
3979 space_args.total_spaces++;
Dan Rosenberg51788b12011-02-14 16:04:23 -05003980 slot_count--;
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003981 }
Dan Rosenberg51788b12011-02-14 16:04:23 -05003982 if (!slot_count)
3983 break;
Josef Bacikbf5fc0932010-09-29 11:22:36 -04003984 }
3985 up_read(&info->groups_sem);
Josef Bacik1406e432010-01-13 18:19:06 +00003986 }
Josef Bacik1406e432010-01-13 18:19:06 +00003987
David Sterba36523e952014-02-07 14:34:12 +01003988 /*
3989 * Add global block reserve
3990 */
3991 if (slot_count) {
3992 struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
3993
3994 spin_lock(&block_rsv->lock);
3995 space.total_bytes = block_rsv->size;
3996 space.used_bytes = block_rsv->size - block_rsv->reserved;
3997 spin_unlock(&block_rsv->lock);
3998 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3999 memcpy(dest, &space, sizeof(space));
4000 space_args.total_spaces++;
4001 }
4002
Daniel J Blueman2eec6c82012-04-26 00:37:14 +08004003 user_dest = (struct btrfs_ioctl_space_info __user *)
Chris Mason7fde62b2010-03-16 15:40:10 -04004004 (arg + sizeof(struct btrfs_ioctl_space_args));
4005
4006 if (copy_to_user(user_dest, dest_orig, alloc_size))
4007 ret = -EFAULT;
4008
4009 kfree(dest_orig);
4010out:
4011 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
Josef Bacik1406e432010-01-13 18:19:06 +00004012 ret = -EFAULT;
4013
4014 return ret;
4015}
4016
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04004017/*
4018 * there are many ways the trans_start and trans_end ioctls can lead
4019 * to deadlocks. They should only be used by applications that
4020 * basically own the machine, and have a very in depth understanding
4021 * of all the possible deadlocks and enospc problems.
4022 */
4023long btrfs_ioctl_trans_end(struct file *file)
4024{
Al Viro496ad9a2013-01-23 17:07:38 -05004025 struct inode *inode = file_inode(file);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04004026 struct btrfs_root *root = BTRFS_I(inode)->root;
4027 struct btrfs_trans_handle *trans;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04004028
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04004029 trans = file->private_data;
Sage Weil1ab86ae2009-09-29 18:38:44 -04004030 if (!trans)
4031 return -EINVAL;
Christoph Hellwigb2141072008-09-05 16:43:31 -04004032 file->private_data = NULL;
Sage Weil9ca9ee02008-08-04 10:41:27 -04004033
Sage Weil1ab86ae2009-09-29 18:38:44 -04004034 btrfs_end_transaction(trans, root);
4035
Josef Bacika4abeea2011-04-11 17:25:13 -04004036 atomic_dec(&root->fs_info->open_ioctl_trans);
Sage Weil9ca9ee02008-08-04 10:41:27 -04004037
Al Viro2a79f172011-12-09 08:06:57 -05004038 mnt_drop_write_file(file);
Sage Weil1ab86ae2009-09-29 18:38:44 -04004039 return 0;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04004040}
4041
Miao Xie9a8c28b2012-11-26 08:40:43 +00004042static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4043 void __user *argp)
Sage Weil46204592010-10-29 15:41:32 -04004044{
Sage Weil46204592010-10-29 15:41:32 -04004045 struct btrfs_trans_handle *trans;
4046 u64 transid;
Tsutomu Itohdb5b4932011-03-23 08:14:16 +00004047 int ret;
Sage Weil46204592010-10-29 15:41:32 -04004048
Miao Xied4edf392013-02-20 09:17:06 +00004049 trans = btrfs_attach_transaction_barrier(root);
Miao Xieff7c1d32012-11-26 08:41:29 +00004050 if (IS_ERR(trans)) {
4051 if (PTR_ERR(trans) != -ENOENT)
4052 return PTR_ERR(trans);
4053
4054 /* No running transaction, don't bother */
4055 transid = root->fs_info->last_trans_committed;
4056 goto out;
4057 }
Sage Weil46204592010-10-29 15:41:32 -04004058 transid = trans->transid;
Tsutomu Itohdb5b4932011-03-23 08:14:16 +00004059 ret = btrfs_commit_transaction_async(trans, root, 0);
Tsutomu Itoh8b2b2d32011-04-04 01:52:13 +00004060 if (ret) {
4061 btrfs_end_transaction(trans, root);
Tsutomu Itohdb5b4932011-03-23 08:14:16 +00004062 return ret;
Tsutomu Itoh8b2b2d32011-04-04 01:52:13 +00004063 }
Miao Xieff7c1d32012-11-26 08:41:29 +00004064out:
Sage Weil46204592010-10-29 15:41:32 -04004065 if (argp)
4066 if (copy_to_user(argp, &transid, sizeof(transid)))
4067 return -EFAULT;
4068 return 0;
4069}
4070
Miao Xie9a8c28b2012-11-26 08:40:43 +00004071static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
4072 void __user *argp)
Sage Weil46204592010-10-29 15:41:32 -04004073{
Sage Weil46204592010-10-29 15:41:32 -04004074 u64 transid;
4075
4076 if (argp) {
4077 if (copy_from_user(&transid, argp, sizeof(transid)))
4078 return -EFAULT;
4079 } else {
4080 transid = 0; /* current trans */
4081 }
4082 return btrfs_wait_for_commit(root, transid);
4083}
4084
Miao Xieb8e95482012-11-26 08:48:01 +00004085static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
Jan Schmidt475f6382011-03-11 15:41:01 +01004086{
Al Viro496ad9a2013-01-23 17:07:38 -05004087 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Jan Schmidt475f6382011-03-11 15:41:01 +01004088 struct btrfs_ioctl_scrub_args *sa;
Miao Xieb8e95482012-11-26 08:48:01 +00004089 int ret;
Jan Schmidt475f6382011-03-11 15:41:01 +01004090
4091 if (!capable(CAP_SYS_ADMIN))
4092 return -EPERM;
4093
4094 sa = memdup_user(arg, sizeof(*sa));
4095 if (IS_ERR(sa))
4096 return PTR_ERR(sa);
4097
Miao Xieb8e95482012-11-26 08:48:01 +00004098 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4099 ret = mnt_want_write_file(file);
4100 if (ret)
4101 goto out;
4102 }
4103
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01004104 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
Stefan Behrens63a212a2012-11-05 18:29:28 +01004105 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4106 0);
Jan Schmidt475f6382011-03-11 15:41:01 +01004107
4108 if (copy_to_user(arg, sa, sizeof(*sa)))
4109 ret = -EFAULT;
4110
Miao Xieb8e95482012-11-26 08:48:01 +00004111 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4112 mnt_drop_write_file(file);
4113out:
Jan Schmidt475f6382011-03-11 15:41:01 +01004114 kfree(sa);
4115 return ret;
4116}
4117
4118static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
4119{
4120 if (!capable(CAP_SYS_ADMIN))
4121 return -EPERM;
4122
Stefan Behrensaa1b8cd2012-11-05 17:03:39 +01004123 return btrfs_scrub_cancel(root->fs_info);
Jan Schmidt475f6382011-03-11 15:41:01 +01004124}
4125
4126static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
4127 void __user *arg)
4128{
4129 struct btrfs_ioctl_scrub_args *sa;
4130 int ret;
4131
4132 if (!capable(CAP_SYS_ADMIN))
4133 return -EPERM;
4134
4135 sa = memdup_user(arg, sizeof(*sa));
4136 if (IS_ERR(sa))
4137 return PTR_ERR(sa);
4138
4139 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
4140
4141 if (copy_to_user(arg, sa, sizeof(*sa)))
4142 ret = -EFAULT;
4143
4144 kfree(sa);
4145 return ret;
4146}
4147
Stefan Behrensc11d2c22012-05-25 16:06:09 +02004148static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
David Sterbab27f7c02012-06-22 06:30:39 -06004149 void __user *arg)
Stefan Behrensc11d2c22012-05-25 16:06:09 +02004150{
4151 struct btrfs_ioctl_get_dev_stats *sa;
4152 int ret;
4153
Stefan Behrensc11d2c22012-05-25 16:06:09 +02004154 sa = memdup_user(arg, sizeof(*sa));
4155 if (IS_ERR(sa))
4156 return PTR_ERR(sa);
4157
David Sterbab27f7c02012-06-22 06:30:39 -06004158 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4159 kfree(sa);
4160 return -EPERM;
4161 }
4162
4163 ret = btrfs_get_dev_stats(root, sa);
Stefan Behrensc11d2c22012-05-25 16:06:09 +02004164
4165 if (copy_to_user(arg, sa, sizeof(*sa)))
4166 ret = -EFAULT;
4167
4168 kfree(sa);
4169 return ret;
4170}
4171
Stefan Behrens3f6bcfb2012-11-06 15:08:53 +01004172static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
4173{
4174 struct btrfs_ioctl_dev_replace_args *p;
4175 int ret;
4176
4177 if (!capable(CAP_SYS_ADMIN))
4178 return -EPERM;
4179
4180 p = memdup_user(arg, sizeof(*p));
4181 if (IS_ERR(p))
4182 return PTR_ERR(p);
4183
4184 switch (p->cmd) {
4185 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
Ilya Dryomovadfa97c2013-10-10 20:39:28 +03004186 if (root->fs_info->sb->s_flags & MS_RDONLY) {
4187 ret = -EROFS;
4188 goto out;
4189 }
Stefan Behrens3f6bcfb2012-11-06 15:08:53 +01004190 if (atomic_xchg(
4191 &root->fs_info->mutually_exclusive_operation_running,
4192 1)) {
Anand Jaine57138b2013-08-21 11:44:48 +08004193 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
Stefan Behrens3f6bcfb2012-11-06 15:08:53 +01004194 } else {
4195 ret = btrfs_dev_replace_start(root, p);
4196 atomic_set(
4197 &root->fs_info->mutually_exclusive_operation_running,
4198 0);
4199 }
4200 break;
4201 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4202 btrfs_dev_replace_status(root->fs_info, p);
4203 ret = 0;
4204 break;
4205 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4206 ret = btrfs_dev_replace_cancel(root->fs_info, p);
4207 break;
4208 default:
4209 ret = -EINVAL;
4210 break;
4211 }
4212
4213 if (copy_to_user(arg, p, sizeof(*p)))
4214 ret = -EFAULT;
Ilya Dryomovadfa97c2013-10-10 20:39:28 +03004215out:
Stefan Behrens3f6bcfb2012-11-06 15:08:53 +01004216 kfree(p);
4217 return ret;
4218}
4219
Jan Schmidtd7728c92011-07-07 16:48:38 +02004220static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4221{
4222 int ret = 0;
4223 int i;
Chris Mason740c3d22011-11-02 15:48:34 -04004224 u64 rel_ptr;
Jan Schmidtd7728c92011-07-07 16:48:38 +02004225 int size;
Chris Mason806468f2011-11-06 03:07:10 -05004226 struct btrfs_ioctl_ino_path_args *ipa = NULL;
Jan Schmidtd7728c92011-07-07 16:48:38 +02004227 struct inode_fs_paths *ipath = NULL;
4228 struct btrfs_path *path;
4229
Kusanagi Kouichi82b22ac2013-01-28 11:33:31 +00004230 if (!capable(CAP_DAC_READ_SEARCH))
Jan Schmidtd7728c92011-07-07 16:48:38 +02004231 return -EPERM;
4232
4233 path = btrfs_alloc_path();
4234 if (!path) {
4235 ret = -ENOMEM;
4236 goto out;
4237 }
4238
4239 ipa = memdup_user(arg, sizeof(*ipa));
4240 if (IS_ERR(ipa)) {
4241 ret = PTR_ERR(ipa);
4242 ipa = NULL;
4243 goto out;
4244 }
4245
4246 size = min_t(u32, ipa->size, 4096);
4247 ipath = init_ipath(size, root, path);
4248 if (IS_ERR(ipath)) {
4249 ret = PTR_ERR(ipath);
4250 ipath = NULL;
4251 goto out;
4252 }
4253
4254 ret = paths_from_inode(ipa->inum, ipath);
4255 if (ret < 0)
4256 goto out;
4257
4258 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
Jeff Mahoney745c4d82011-11-20 07:31:57 -05004259 rel_ptr = ipath->fspath->val[i] -
4260 (u64)(unsigned long)ipath->fspath->val;
Chris Mason740c3d22011-11-02 15:48:34 -04004261 ipath->fspath->val[i] = rel_ptr;
Jan Schmidtd7728c92011-07-07 16:48:38 +02004262 }
4263
Jeff Mahoney745c4d82011-11-20 07:31:57 -05004264 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
4265 (void *)(unsigned long)ipath->fspath, size);
Jan Schmidtd7728c92011-07-07 16:48:38 +02004266 if (ret) {
4267 ret = -EFAULT;
4268 goto out;
4269 }
4270
4271out:
4272 btrfs_free_path(path);
4273 free_ipath(ipath);
4274 kfree(ipa);
4275
4276 return ret;
4277}
4278
4279static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4280{
4281 struct btrfs_data_container *inodes = ctx;
4282 const size_t c = 3 * sizeof(u64);
4283
4284 if (inodes->bytes_left >= c) {
4285 inodes->bytes_left -= c;
4286 inodes->val[inodes->elem_cnt] = inum;
4287 inodes->val[inodes->elem_cnt + 1] = offset;
4288 inodes->val[inodes->elem_cnt + 2] = root;
4289 inodes->elem_cnt += 3;
4290 } else {
4291 inodes->bytes_missing += c - inodes->bytes_left;
4292 inodes->bytes_left = 0;
4293 inodes->elem_missed += 3;
4294 }
4295
4296 return 0;
4297}
4298
4299static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
4300 void __user *arg)
4301{
4302 int ret = 0;
4303 int size;
Jan Schmidtd7728c92011-07-07 16:48:38 +02004304 struct btrfs_ioctl_logical_ino_args *loi;
4305 struct btrfs_data_container *inodes = NULL;
4306 struct btrfs_path *path = NULL;
Jan Schmidtd7728c92011-07-07 16:48:38 +02004307
4308 if (!capable(CAP_SYS_ADMIN))
4309 return -EPERM;
4310
4311 loi = memdup_user(arg, sizeof(*loi));
4312 if (IS_ERR(loi)) {
4313 ret = PTR_ERR(loi);
4314 loi = NULL;
4315 goto out;
4316 }
4317
4318 path = btrfs_alloc_path();
4319 if (!path) {
4320 ret = -ENOMEM;
4321 goto out;
4322 }
4323
Liu Bo425d17a2012-09-07 20:01:30 -06004324 size = min_t(u32, loi->size, 64 * 1024);
Jan Schmidtd7728c92011-07-07 16:48:38 +02004325 inodes = init_data_container(size);
4326 if (IS_ERR(inodes)) {
4327 ret = PTR_ERR(inodes);
4328 inodes = NULL;
4329 goto out;
4330 }
4331
Liu Bodf031f02012-09-07 20:01:29 -06004332 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
4333 build_ino_list, inodes);
4334 if (ret == -EINVAL)
Jan Schmidtd7728c92011-07-07 16:48:38 +02004335 ret = -ENOENT;
4336 if (ret < 0)
4337 goto out;
4338
Jeff Mahoney745c4d82011-11-20 07:31:57 -05004339 ret = copy_to_user((void *)(unsigned long)loi->inodes,
4340 (void *)(unsigned long)inodes, size);
Jan Schmidtd7728c92011-07-07 16:48:38 +02004341 if (ret)
4342 ret = -EFAULT;
4343
4344out:
4345 btrfs_free_path(path);
Liu Bo425d17a2012-09-07 20:01:30 -06004346 vfree(inodes);
Jan Schmidtd7728c92011-07-07 16:48:38 +02004347 kfree(loi);
4348
4349 return ret;
4350}
4351
Ilya Dryomov19a39dc2012-01-16 22:04:49 +02004352void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004353 struct btrfs_ioctl_balance_args *bargs)
4354{
4355 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4356
4357 bargs->flags = bctl->flags;
4358
Ilya Dryomov837d5b62012-01-16 22:04:49 +02004359 if (atomic_read(&fs_info->balance_running))
4360 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4361 if (atomic_read(&fs_info->balance_pause_req))
4362 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
Ilya Dryomova7e99c62012-01-16 22:04:49 +02004363 if (atomic_read(&fs_info->balance_cancel_req))
4364 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
Ilya Dryomov837d5b62012-01-16 22:04:49 +02004365
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004366 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4367 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4368 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
Ilya Dryomov19a39dc2012-01-16 22:04:49 +02004369
4370 if (lock) {
4371 spin_lock(&fs_info->balance_lock);
4372 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4373 spin_unlock(&fs_info->balance_lock);
4374 } else {
4375 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4376 }
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004377}
4378
Liu Bo9ba1f6e2012-05-11 18:11:26 +08004379static long btrfs_ioctl_balance(struct file *file, void __user *arg)
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004380{
Al Viro496ad9a2013-01-23 17:07:38 -05004381 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004382 struct btrfs_fs_info *fs_info = root->fs_info;
4383 struct btrfs_ioctl_balance_args *bargs;
4384 struct btrfs_balance_control *bctl;
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004385 bool need_unlock; /* for mut. excl. ops lock */
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004386 int ret;
4387
4388 if (!capable(CAP_SYS_ADMIN))
4389 return -EPERM;
4390
Liu Boe54bfa32012-06-29 03:58:48 -06004391 ret = mnt_want_write_file(file);
Liu Bo9ba1f6e2012-05-11 18:11:26 +08004392 if (ret)
4393 return ret;
4394
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004395again:
4396 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4397 mutex_lock(&fs_info->volume_mutex);
4398 mutex_lock(&fs_info->balance_mutex);
4399 need_unlock = true;
4400 goto locked;
4401 }
4402
4403 /*
4404 * mut. excl. ops lock is locked. Three possibilites:
4405 * (1) some other op is running
4406 * (2) balance is running
4407 * (3) balance is paused -- special case (think resume)
4408 */
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004409 mutex_lock(&fs_info->balance_mutex);
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004410 if (fs_info->balance_ctl) {
4411 /* this is either (2) or (3) */
4412 if (!atomic_read(&fs_info->balance_running)) {
4413 mutex_unlock(&fs_info->balance_mutex);
4414 if (!mutex_trylock(&fs_info->volume_mutex))
4415 goto again;
4416 mutex_lock(&fs_info->balance_mutex);
4417
4418 if (fs_info->balance_ctl &&
4419 !atomic_read(&fs_info->balance_running)) {
4420 /* this is (3) */
4421 need_unlock = false;
4422 goto locked;
4423 }
4424
4425 mutex_unlock(&fs_info->balance_mutex);
4426 mutex_unlock(&fs_info->volume_mutex);
4427 goto again;
4428 } else {
4429 /* this is (2) */
4430 mutex_unlock(&fs_info->balance_mutex);
4431 ret = -EINPROGRESS;
4432 goto out;
4433 }
4434 } else {
4435 /* this is (1) */
4436 mutex_unlock(&fs_info->balance_mutex);
Anand Jaine57138b2013-08-21 11:44:48 +08004437 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004438 goto out;
4439 }
4440
4441locked:
4442 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004443
4444 if (arg) {
4445 bargs = memdup_user(arg, sizeof(*bargs));
4446 if (IS_ERR(bargs)) {
4447 ret = PTR_ERR(bargs);
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004448 goto out_unlock;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004449 }
Ilya Dryomovde322262012-01-16 22:04:49 +02004450
4451 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4452 if (!fs_info->balance_ctl) {
4453 ret = -ENOTCONN;
4454 goto out_bargs;
4455 }
4456
4457 bctl = fs_info->balance_ctl;
4458 spin_lock(&fs_info->balance_lock);
4459 bctl->flags |= BTRFS_BALANCE_RESUME;
4460 spin_unlock(&fs_info->balance_lock);
4461
4462 goto do_balance;
4463 }
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004464 } else {
4465 bargs = NULL;
4466 }
4467
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004468 if (fs_info->balance_ctl) {
Ilya Dryomov837d5b62012-01-16 22:04:49 +02004469 ret = -EINPROGRESS;
4470 goto out_bargs;
4471 }
4472
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004473 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
4474 if (!bctl) {
4475 ret = -ENOMEM;
4476 goto out_bargs;
4477 }
4478
4479 bctl->fs_info = fs_info;
4480 if (arg) {
4481 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4482 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4483 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4484
4485 bctl->flags = bargs->flags;
Ilya Dryomovf43ffb62012-01-16 22:04:47 +02004486 } else {
4487 /* balance everything - no filters */
4488 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004489 }
4490
Ilya Dryomovde322262012-01-16 22:04:49 +02004491do_balance:
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004492 /*
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004493 * Ownership of bctl and mutually_exclusive_operation_running
4494 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4495 * or, if restriper was paused all the way until unmount, in
4496 * free_fs_info. mutually_exclusive_operation_running is
4497 * cleared in __cancel_balance.
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004498 */
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004499 need_unlock = false;
4500
4501 ret = btrfs_balance(bctl, bargs);
4502
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004503 if (arg) {
4504 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4505 ret = -EFAULT;
4506 }
4507
4508out_bargs:
4509 kfree(bargs);
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004510out_unlock:
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004511 mutex_unlock(&fs_info->balance_mutex);
4512 mutex_unlock(&fs_info->volume_mutex);
Ilya Dryomoved0fb782013-01-20 15:57:57 +02004513 if (need_unlock)
4514 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4515out:
Liu Boe54bfa32012-06-29 03:58:48 -06004516 mnt_drop_write_file(file);
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02004517 return ret;
4518}
4519
Ilya Dryomov837d5b62012-01-16 22:04:49 +02004520static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4521{
4522 if (!capable(CAP_SYS_ADMIN))
4523 return -EPERM;
4524
4525 switch (cmd) {
4526 case BTRFS_BALANCE_CTL_PAUSE:
4527 return btrfs_pause_balance(root->fs_info);
Ilya Dryomova7e99c62012-01-16 22:04:49 +02004528 case BTRFS_BALANCE_CTL_CANCEL:
4529 return btrfs_cancel_balance(root->fs_info);
Ilya Dryomov837d5b62012-01-16 22:04:49 +02004530 }
4531
4532 return -EINVAL;
4533}
4534
Ilya Dryomov19a39dc2012-01-16 22:04:49 +02004535static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4536 void __user *arg)
4537{
4538 struct btrfs_fs_info *fs_info = root->fs_info;
4539 struct btrfs_ioctl_balance_args *bargs;
4540 int ret = 0;
4541
4542 if (!capable(CAP_SYS_ADMIN))
4543 return -EPERM;
4544
4545 mutex_lock(&fs_info->balance_mutex);
4546 if (!fs_info->balance_ctl) {
4547 ret = -ENOTCONN;
4548 goto out;
4549 }
4550
4551 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
4552 if (!bargs) {
4553 ret = -ENOMEM;
4554 goto out;
4555 }
4556
4557 update_ioctl_balance_args(fs_info, 1, bargs);
4558
4559 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4560 ret = -EFAULT;
4561
4562 kfree(bargs);
4563out:
4564 mutex_unlock(&fs_info->balance_mutex);
4565 return ret;
4566}
4567
Miao Xie905b0dd2012-11-26 08:50:11 +00004568static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
Arne Jansen5d13a372011-09-14 15:53:51 +02004569{
Al Viro496ad9a2013-01-23 17:07:38 -05004570 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Arne Jansen5d13a372011-09-14 15:53:51 +02004571 struct btrfs_ioctl_quota_ctl_args *sa;
4572 struct btrfs_trans_handle *trans = NULL;
4573 int ret;
4574 int err;
4575
4576 if (!capable(CAP_SYS_ADMIN))
4577 return -EPERM;
4578
Miao Xie905b0dd2012-11-26 08:50:11 +00004579 ret = mnt_want_write_file(file);
4580 if (ret)
4581 return ret;
Arne Jansen5d13a372011-09-14 15:53:51 +02004582
4583 sa = memdup_user(arg, sizeof(*sa));
Miao Xie905b0dd2012-11-26 08:50:11 +00004584 if (IS_ERR(sa)) {
4585 ret = PTR_ERR(sa);
4586 goto drop_write;
4587 }
Arne Jansen5d13a372011-09-14 15:53:51 +02004588
Wang Shilong7708f022013-04-07 10:24:57 +00004589 down_write(&root->fs_info->subvol_sem);
Jan Schmidt2f232032013-04-25 16:04:51 +00004590 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4591 if (IS_ERR(trans)) {
4592 ret = PTR_ERR(trans);
4593 goto out;
Arne Jansen5d13a372011-09-14 15:53:51 +02004594 }
4595
4596 switch (sa->cmd) {
4597 case BTRFS_QUOTA_CTL_ENABLE:
4598 ret = btrfs_quota_enable(trans, root->fs_info);
4599 break;
4600 case BTRFS_QUOTA_CTL_DISABLE:
4601 ret = btrfs_quota_disable(trans, root->fs_info);
4602 break;
Arne Jansen5d13a372011-09-14 15:53:51 +02004603 default:
4604 ret = -EINVAL;
4605 break;
4606 }
4607
Jan Schmidt2f232032013-04-25 16:04:51 +00004608 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4609 if (err && !ret)
4610 ret = err;
Arne Jansen5d13a372011-09-14 15:53:51 +02004611out:
4612 kfree(sa);
Wang Shilong7708f022013-04-07 10:24:57 +00004613 up_write(&root->fs_info->subvol_sem);
Miao Xie905b0dd2012-11-26 08:50:11 +00004614drop_write:
4615 mnt_drop_write_file(file);
Arne Jansen5d13a372011-09-14 15:53:51 +02004616 return ret;
4617}
4618
Miao Xie905b0dd2012-11-26 08:50:11 +00004619static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
Arne Jansen5d13a372011-09-14 15:53:51 +02004620{
Al Viro496ad9a2013-01-23 17:07:38 -05004621 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Arne Jansen5d13a372011-09-14 15:53:51 +02004622 struct btrfs_ioctl_qgroup_assign_args *sa;
4623 struct btrfs_trans_handle *trans;
4624 int ret;
4625 int err;
4626
4627 if (!capable(CAP_SYS_ADMIN))
4628 return -EPERM;
4629
Miao Xie905b0dd2012-11-26 08:50:11 +00004630 ret = mnt_want_write_file(file);
4631 if (ret)
4632 return ret;
Arne Jansen5d13a372011-09-14 15:53:51 +02004633
4634 sa = memdup_user(arg, sizeof(*sa));
Miao Xie905b0dd2012-11-26 08:50:11 +00004635 if (IS_ERR(sa)) {
4636 ret = PTR_ERR(sa);
4637 goto drop_write;
4638 }
Arne Jansen5d13a372011-09-14 15:53:51 +02004639
4640 trans = btrfs_join_transaction(root);
4641 if (IS_ERR(trans)) {
4642 ret = PTR_ERR(trans);
4643 goto out;
4644 }
4645
4646 /* FIXME: check if the IDs really exist */
4647 if (sa->assign) {
4648 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4649 sa->src, sa->dst);
4650 } else {
4651 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4652 sa->src, sa->dst);
4653 }
4654
4655 err = btrfs_end_transaction(trans, root);
4656 if (err && !ret)
4657 ret = err;
4658
4659out:
4660 kfree(sa);
Miao Xie905b0dd2012-11-26 08:50:11 +00004661drop_write:
4662 mnt_drop_write_file(file);
Arne Jansen5d13a372011-09-14 15:53:51 +02004663 return ret;
4664}
4665
Miao Xie905b0dd2012-11-26 08:50:11 +00004666static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
Arne Jansen5d13a372011-09-14 15:53:51 +02004667{
Al Viro496ad9a2013-01-23 17:07:38 -05004668 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Arne Jansen5d13a372011-09-14 15:53:51 +02004669 struct btrfs_ioctl_qgroup_create_args *sa;
4670 struct btrfs_trans_handle *trans;
4671 int ret;
4672 int err;
4673
4674 if (!capable(CAP_SYS_ADMIN))
4675 return -EPERM;
4676
Miao Xie905b0dd2012-11-26 08:50:11 +00004677 ret = mnt_want_write_file(file);
4678 if (ret)
4679 return ret;
Arne Jansen5d13a372011-09-14 15:53:51 +02004680
4681 sa = memdup_user(arg, sizeof(*sa));
Miao Xie905b0dd2012-11-26 08:50:11 +00004682 if (IS_ERR(sa)) {
4683 ret = PTR_ERR(sa);
4684 goto drop_write;
4685 }
Arne Jansen5d13a372011-09-14 15:53:51 +02004686
Miao Xied86e56c2012-11-15 11:35:41 +00004687 if (!sa->qgroupid) {
4688 ret = -EINVAL;
4689 goto out;
4690 }
4691
Arne Jansen5d13a372011-09-14 15:53:51 +02004692 trans = btrfs_join_transaction(root);
4693 if (IS_ERR(trans)) {
4694 ret = PTR_ERR(trans);
4695 goto out;
4696 }
4697
4698 /* FIXME: check if the IDs really exist */
4699 if (sa->create) {
4700 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
4701 NULL);
4702 } else {
4703 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4704 }
4705
4706 err = btrfs_end_transaction(trans, root);
4707 if (err && !ret)
4708 ret = err;
4709
4710out:
4711 kfree(sa);
Miao Xie905b0dd2012-11-26 08:50:11 +00004712drop_write:
4713 mnt_drop_write_file(file);
Arne Jansen5d13a372011-09-14 15:53:51 +02004714 return ret;
4715}
4716
Miao Xie905b0dd2012-11-26 08:50:11 +00004717static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
Arne Jansen5d13a372011-09-14 15:53:51 +02004718{
Al Viro496ad9a2013-01-23 17:07:38 -05004719 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Arne Jansen5d13a372011-09-14 15:53:51 +02004720 struct btrfs_ioctl_qgroup_limit_args *sa;
4721 struct btrfs_trans_handle *trans;
4722 int ret;
4723 int err;
4724 u64 qgroupid;
4725
4726 if (!capable(CAP_SYS_ADMIN))
4727 return -EPERM;
4728
Miao Xie905b0dd2012-11-26 08:50:11 +00004729 ret = mnt_want_write_file(file);
4730 if (ret)
4731 return ret;
Arne Jansen5d13a372011-09-14 15:53:51 +02004732
4733 sa = memdup_user(arg, sizeof(*sa));
Miao Xie905b0dd2012-11-26 08:50:11 +00004734 if (IS_ERR(sa)) {
4735 ret = PTR_ERR(sa);
4736 goto drop_write;
4737 }
Arne Jansen5d13a372011-09-14 15:53:51 +02004738
4739 trans = btrfs_join_transaction(root);
4740 if (IS_ERR(trans)) {
4741 ret = PTR_ERR(trans);
4742 goto out;
4743 }
4744
4745 qgroupid = sa->qgroupid;
4746 if (!qgroupid) {
4747 /* take the current subvol as qgroup */
4748 qgroupid = root->root_key.objectid;
4749 }
4750
4751 /* FIXME: check if the IDs really exist */
4752 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4753
4754 err = btrfs_end_transaction(trans, root);
4755 if (err && !ret)
4756 ret = err;
4757
4758out:
4759 kfree(sa);
Miao Xie905b0dd2012-11-26 08:50:11 +00004760drop_write:
4761 mnt_drop_write_file(file);
Arne Jansen5d13a372011-09-14 15:53:51 +02004762 return ret;
4763}
4764
Jan Schmidt2f232032013-04-25 16:04:51 +00004765static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4766{
Al Viro6d0379e2013-06-16 19:32:35 +04004767 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Jan Schmidt2f232032013-04-25 16:04:51 +00004768 struct btrfs_ioctl_quota_rescan_args *qsa;
4769 int ret;
4770
4771 if (!capable(CAP_SYS_ADMIN))
4772 return -EPERM;
4773
4774 ret = mnt_want_write_file(file);
4775 if (ret)
4776 return ret;
4777
4778 qsa = memdup_user(arg, sizeof(*qsa));
4779 if (IS_ERR(qsa)) {
4780 ret = PTR_ERR(qsa);
4781 goto drop_write;
4782 }
4783
4784 if (qsa->flags) {
4785 ret = -EINVAL;
4786 goto out;
4787 }
4788
4789 ret = btrfs_qgroup_rescan(root->fs_info);
4790
4791out:
4792 kfree(qsa);
4793drop_write:
4794 mnt_drop_write_file(file);
4795 return ret;
4796}
4797
4798static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4799{
Al Viro6d0379e2013-06-16 19:32:35 +04004800 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Jan Schmidt2f232032013-04-25 16:04:51 +00004801 struct btrfs_ioctl_quota_rescan_args *qsa;
4802 int ret = 0;
4803
4804 if (!capable(CAP_SYS_ADMIN))
4805 return -EPERM;
4806
4807 qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
4808 if (!qsa)
4809 return -ENOMEM;
4810
4811 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4812 qsa->flags = 1;
4813 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
4814 }
4815
4816 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4817 ret = -EFAULT;
4818
4819 kfree(qsa);
4820 return ret;
4821}
4822
Jan Schmidt57254b6e2013-05-06 19:14:17 +00004823static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4824{
Al Viro54563d42013-09-01 15:57:51 -04004825 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Jan Schmidt57254b6e2013-05-06 19:14:17 +00004826
4827 if (!capable(CAP_SYS_ADMIN))
4828 return -EPERM;
4829
4830 return btrfs_qgroup_wait_for_completion(root->fs_info);
4831}
4832
Hugo Millsabccd002014-01-30 20:17:00 +00004833static long _btrfs_ioctl_set_received_subvol(struct file *file,
4834 struct btrfs_ioctl_received_subvol_args *sa)
Alexander Block8ea05e32012-07-25 17:35:53 +02004835{
Al Viro496ad9a2013-01-23 17:07:38 -05004836 struct inode *inode = file_inode(file);
Alexander Block8ea05e32012-07-25 17:35:53 +02004837 struct btrfs_root *root = BTRFS_I(inode)->root;
4838 struct btrfs_root_item *root_item = &root->root_item;
4839 struct btrfs_trans_handle *trans;
4840 struct timespec ct = CURRENT_TIME;
4841 int ret = 0;
Stefan Behrensdd5f9612013-08-15 17:11:20 +02004842 int received_uuid_changed;
Alexander Block8ea05e32012-07-25 17:35:53 +02004843
David Sterbabd60ea02014-01-16 15:50:22 +01004844 if (!inode_owner_or_capable(inode))
4845 return -EPERM;
4846
Alexander Block8ea05e32012-07-25 17:35:53 +02004847 ret = mnt_want_write_file(file);
4848 if (ret < 0)
4849 return ret;
4850
4851 down_write(&root->fs_info->subvol_sem);
4852
4853 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
4854 ret = -EINVAL;
4855 goto out;
4856 }
4857
4858 if (btrfs_root_readonly(root)) {
4859 ret = -EROFS;
4860 goto out;
4861 }
4862
Stefan Behrensdd5f9612013-08-15 17:11:20 +02004863 /*
4864 * 1 - root item
4865 * 2 - uuid items (received uuid + subvol uuid)
4866 */
4867 trans = btrfs_start_transaction(root, 3);
Alexander Block8ea05e32012-07-25 17:35:53 +02004868 if (IS_ERR(trans)) {
4869 ret = PTR_ERR(trans);
4870 trans = NULL;
4871 goto out;
4872 }
4873
4874 sa->rtransid = trans->transid;
4875 sa->rtime.sec = ct.tv_sec;
4876 sa->rtime.nsec = ct.tv_nsec;
4877
Stefan Behrensdd5f9612013-08-15 17:11:20 +02004878 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4879 BTRFS_UUID_SIZE);
4880 if (received_uuid_changed &&
4881 !btrfs_is_empty_uuid(root_item->received_uuid))
4882 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
4883 root_item->received_uuid,
4884 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4885 root->root_key.objectid);
Alexander Block8ea05e32012-07-25 17:35:53 +02004886 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4887 btrfs_set_root_stransid(root_item, sa->stransid);
4888 btrfs_set_root_rtransid(root_item, sa->rtransid);
Qu Wenruo3cae2102013-07-16 11:19:18 +08004889 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4890 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4891 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4892 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
Alexander Block8ea05e32012-07-25 17:35:53 +02004893
4894 ret = btrfs_update_root(trans, root->fs_info->tree_root,
4895 &root->root_key, &root->root_item);
4896 if (ret < 0) {
4897 btrfs_end_transaction(trans, root);
Alexander Block8ea05e32012-07-25 17:35:53 +02004898 goto out;
Stefan Behrensdd5f9612013-08-15 17:11:20 +02004899 }
4900 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4901 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
4902 sa->uuid,
4903 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4904 root->root_key.objectid);
4905 if (ret < 0 && ret != -EEXIST) {
4906 btrfs_abort_transaction(trans, root, ret);
Alexander Block8ea05e32012-07-25 17:35:53 +02004907 goto out;
Stefan Behrensdd5f9612013-08-15 17:11:20 +02004908 }
4909 }
4910 ret = btrfs_commit_transaction(trans, root);
4911 if (ret < 0) {
4912 btrfs_abort_transaction(trans, root, ret);
4913 goto out;
Alexander Block8ea05e32012-07-25 17:35:53 +02004914 }
4915
Hugo Millsabccd002014-01-30 20:17:00 +00004916out:
4917 up_write(&root->fs_info->subvol_sem);
4918 mnt_drop_write_file(file);
4919 return ret;
4920}
4921
4922#ifdef CONFIG_64BIT
4923static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4924 void __user *arg)
4925{
4926 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4927 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4928 int ret = 0;
4929
4930 args32 = memdup_user(arg, sizeof(*args32));
4931 if (IS_ERR(args32)) {
4932 ret = PTR_ERR(args32);
4933 args32 = NULL;
4934 goto out;
4935 }
4936
4937 args64 = kmalloc(sizeof(*args64), GFP_NOFS);
Dan Carpenter84dbeb82014-03-28 11:06:00 +03004938 if (!args64) {
4939 ret = -ENOMEM;
Hugo Millsabccd002014-01-30 20:17:00 +00004940 goto out;
4941 }
4942
4943 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4944 args64->stransid = args32->stransid;
4945 args64->rtransid = args32->rtransid;
4946 args64->stime.sec = args32->stime.sec;
4947 args64->stime.nsec = args32->stime.nsec;
4948 args64->rtime.sec = args32->rtime.sec;
4949 args64->rtime.nsec = args32->rtime.nsec;
4950 args64->flags = args32->flags;
4951
4952 ret = _btrfs_ioctl_set_received_subvol(file, args64);
4953 if (ret)
4954 goto out;
4955
4956 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4957 args32->stransid = args64->stransid;
4958 args32->rtransid = args64->rtransid;
4959 args32->stime.sec = args64->stime.sec;
4960 args32->stime.nsec = args64->stime.nsec;
4961 args32->rtime.sec = args64->rtime.sec;
4962 args32->rtime.nsec = args64->rtime.nsec;
4963 args32->flags = args64->flags;
4964
4965 ret = copy_to_user(arg, args32, sizeof(*args32));
4966 if (ret)
4967 ret = -EFAULT;
4968
4969out:
4970 kfree(args32);
4971 kfree(args64);
4972 return ret;
4973}
4974#endif
4975
4976static long btrfs_ioctl_set_received_subvol(struct file *file,
4977 void __user *arg)
4978{
4979 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4980 int ret = 0;
4981
4982 sa = memdup_user(arg, sizeof(*sa));
4983 if (IS_ERR(sa)) {
4984 ret = PTR_ERR(sa);
4985 sa = NULL;
4986 goto out;
4987 }
4988
4989 ret = _btrfs_ioctl_set_received_subvol(file, sa);
4990
4991 if (ret)
4992 goto out;
4993
Alexander Block8ea05e32012-07-25 17:35:53 +02004994 ret = copy_to_user(arg, sa, sizeof(*sa));
4995 if (ret)
4996 ret = -EFAULT;
4997
4998out:
4999 kfree(sa);
Alexander Block8ea05e32012-07-25 17:35:53 +02005000 return ret;
5001}
5002
jeff.liu867ab662013-01-05 02:48:01 +00005003static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5004{
Al Viro6d0379e2013-06-16 19:32:35 +04005005 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Anand Jaina1b83ac2013-07-19 17:39:32 +08005006 size_t len;
jeff.liu867ab662013-01-05 02:48:01 +00005007 int ret;
Anand Jaina1b83ac2013-07-19 17:39:32 +08005008 char label[BTRFS_LABEL_SIZE];
5009
5010 spin_lock(&root->fs_info->super_lock);
5011 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5012 spin_unlock(&root->fs_info->super_lock);
5013
5014 len = strnlen(label, BTRFS_LABEL_SIZE);
jeff.liu867ab662013-01-05 02:48:01 +00005015
5016 if (len == BTRFS_LABEL_SIZE) {
Frank Holtonefe120a2013-12-20 11:37:06 -05005017 btrfs_warn(root->fs_info,
5018 "label is too long, return the first %zu bytes", --len);
jeff.liu867ab662013-01-05 02:48:01 +00005019 }
5020
jeff.liu867ab662013-01-05 02:48:01 +00005021 ret = copy_to_user(arg, label, len);
jeff.liu867ab662013-01-05 02:48:01 +00005022
5023 return ret ? -EFAULT : 0;
5024}
5025
jeff.liua8bfd4a2013-01-05 02:48:08 +00005026static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5027{
Al Viro6d0379e2013-06-16 19:32:35 +04005028 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
jeff.liua8bfd4a2013-01-05 02:48:08 +00005029 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5030 struct btrfs_trans_handle *trans;
5031 char label[BTRFS_LABEL_SIZE];
5032 int ret;
5033
5034 if (!capable(CAP_SYS_ADMIN))
5035 return -EPERM;
5036
5037 if (copy_from_user(label, arg, sizeof(label)))
5038 return -EFAULT;
5039
5040 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
Frank Holtonefe120a2013-12-20 11:37:06 -05005041 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
jeff.liua8bfd4a2013-01-05 02:48:08 +00005042 BTRFS_LABEL_SIZE - 1);
5043 return -EINVAL;
5044 }
5045
5046 ret = mnt_want_write_file(file);
5047 if (ret)
5048 return ret;
5049
jeff.liua8bfd4a2013-01-05 02:48:08 +00005050 trans = btrfs_start_transaction(root, 0);
5051 if (IS_ERR(trans)) {
5052 ret = PTR_ERR(trans);
5053 goto out_unlock;
5054 }
5055
Anand Jaina1b83ac2013-07-19 17:39:32 +08005056 spin_lock(&root->fs_info->super_lock);
jeff.liua8bfd4a2013-01-05 02:48:08 +00005057 strcpy(super_block->label, label);
Anand Jaina1b83ac2013-07-19 17:39:32 +08005058 spin_unlock(&root->fs_info->super_lock);
Jeff Mahoneyd0270ac2014-02-07 14:33:57 +01005059 ret = btrfs_commit_transaction(trans, root);
jeff.liua8bfd4a2013-01-05 02:48:08 +00005060
5061out_unlock:
jeff.liua8bfd4a2013-01-05 02:48:08 +00005062 mnt_drop_write_file(file);
5063 return ret;
5064}
5065
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005066#define INIT_FEATURE_FLAGS(suffix) \
5067 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5068 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5069 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5070
5071static int btrfs_ioctl_get_supported_features(struct file *file,
5072 void __user *arg)
5073{
5074 static struct btrfs_ioctl_feature_flags features[3] = {
5075 INIT_FEATURE_FLAGS(SUPP),
5076 INIT_FEATURE_FLAGS(SAFE_SET),
5077 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5078 };
5079
5080 if (copy_to_user(arg, &features, sizeof(features)))
5081 return -EFAULT;
5082
5083 return 0;
5084}
5085
5086static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5087{
5088 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5089 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5090 struct btrfs_ioctl_feature_flags features;
5091
5092 features.compat_flags = btrfs_super_compat_flags(super_block);
5093 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5094 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5095
5096 if (copy_to_user(arg, &features, sizeof(features)))
5097 return -EFAULT;
5098
5099 return 0;
5100}
5101
Jeff Mahoney3b02a682013-11-01 13:07:02 -04005102static int check_feature_bits(struct btrfs_root *root,
5103 enum btrfs_feature_set set,
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005104 u64 change_mask, u64 flags, u64 supported_flags,
5105 u64 safe_set, u64 safe_clear)
5106{
Jeff Mahoney3b02a682013-11-01 13:07:02 -04005107 const char *type = btrfs_feature_set_names[set];
5108 char *names;
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005109 u64 disallowed, unsupported;
5110 u64 set_mask = flags & change_mask;
5111 u64 clear_mask = ~flags & change_mask;
5112
5113 unsupported = set_mask & ~supported_flags;
5114 if (unsupported) {
Jeff Mahoney3b02a682013-11-01 13:07:02 -04005115 names = btrfs_printable_features(set, unsupported);
5116 if (names) {
5117 btrfs_warn(root->fs_info,
5118 "this kernel does not support the %s feature bit%s",
5119 names, strchr(names, ',') ? "s" : "");
5120 kfree(names);
5121 } else
5122 btrfs_warn(root->fs_info,
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005123 "this kernel does not support %s bits 0x%llx",
5124 type, unsupported);
5125 return -EOPNOTSUPP;
5126 }
5127
5128 disallowed = set_mask & ~safe_set;
5129 if (disallowed) {
Jeff Mahoney3b02a682013-11-01 13:07:02 -04005130 names = btrfs_printable_features(set, disallowed);
5131 if (names) {
5132 btrfs_warn(root->fs_info,
5133 "can't set the %s feature bit%s while mounted",
5134 names, strchr(names, ',') ? "s" : "");
5135 kfree(names);
5136 } else
5137 btrfs_warn(root->fs_info,
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005138 "can't set %s bits 0x%llx while mounted",
5139 type, disallowed);
5140 return -EPERM;
5141 }
5142
5143 disallowed = clear_mask & ~safe_clear;
5144 if (disallowed) {
Jeff Mahoney3b02a682013-11-01 13:07:02 -04005145 names = btrfs_printable_features(set, disallowed);
5146 if (names) {
5147 btrfs_warn(root->fs_info,
5148 "can't clear the %s feature bit%s while mounted",
5149 names, strchr(names, ',') ? "s" : "");
5150 kfree(names);
5151 } else
5152 btrfs_warn(root->fs_info,
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005153 "can't clear %s bits 0x%llx while mounted",
5154 type, disallowed);
5155 return -EPERM;
5156 }
5157
5158 return 0;
5159}
5160
5161#define check_feature(root, change_mask, flags, mask_base) \
Jeff Mahoney3b02a682013-11-01 13:07:02 -04005162check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005163 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5164 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5165 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5166
5167static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5168{
5169 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5170 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5171 struct btrfs_ioctl_feature_flags flags[2];
5172 struct btrfs_trans_handle *trans;
5173 u64 newflags;
5174 int ret;
5175
5176 if (!capable(CAP_SYS_ADMIN))
5177 return -EPERM;
5178
5179 if (copy_from_user(flags, arg, sizeof(flags)))
5180 return -EFAULT;
5181
5182 /* Nothing to do */
5183 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5184 !flags[0].incompat_flags)
5185 return 0;
5186
5187 ret = check_feature(root, flags[0].compat_flags,
5188 flags[1].compat_flags, COMPAT);
5189 if (ret)
5190 return ret;
5191
5192 ret = check_feature(root, flags[0].compat_ro_flags,
5193 flags[1].compat_ro_flags, COMPAT_RO);
5194 if (ret)
5195 return ret;
5196
5197 ret = check_feature(root, flags[0].incompat_flags,
5198 flags[1].incompat_flags, INCOMPAT);
5199 if (ret)
5200 return ret;
5201
David Sterba8051aa12014-02-07 14:34:04 +01005202 trans = btrfs_start_transaction(root, 0);
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005203 if (IS_ERR(trans))
5204 return PTR_ERR(trans);
5205
5206 spin_lock(&root->fs_info->super_lock);
5207 newflags = btrfs_super_compat_flags(super_block);
5208 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5209 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5210 btrfs_set_super_compat_flags(super_block, newflags);
5211
5212 newflags = btrfs_super_compat_ro_flags(super_block);
5213 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5214 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5215 btrfs_set_super_compat_ro_flags(super_block, newflags);
5216
5217 newflags = btrfs_super_incompat_flags(super_block);
5218 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5219 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5220 btrfs_set_super_incompat_flags(super_block, newflags);
5221 spin_unlock(&root->fs_info->super_lock);
5222
Jeff Mahoneyd0270ac2014-02-07 14:33:57 +01005223 return btrfs_commit_transaction(trans, root);
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005224}
5225
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005226long btrfs_ioctl(struct file *file, unsigned int
5227 cmd, unsigned long arg)
5228{
Al Viro496ad9a2013-01-23 17:07:38 -05005229 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
Christoph Hellwig4bcabaa2008-12-02 06:36:08 -05005230 void __user *argp = (void __user *)arg;
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005231
5232 switch (cmd) {
Christoph Hellwig6cbff002009-04-17 10:37:41 +02005233 case FS_IOC_GETFLAGS:
5234 return btrfs_ioctl_getflags(file, argp);
5235 case FS_IOC_SETFLAGS:
5236 return btrfs_ioctl_setflags(file, argp);
5237 case FS_IOC_GETVERSION:
5238 return btrfs_ioctl_getversion(file, argp);
Li Dongyangf7039b12011-03-24 10:24:28 +00005239 case FITRIM:
5240 return btrfs_ioctl_fitrim(file, argp);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005241 case BTRFS_IOC_SNAP_CREATE:
Li Zefanfa0d2b92010-12-20 15:53:28 +08005242 return btrfs_ioctl_snap_create(file, argp, 0);
Li Zefanfdfb1e42010-12-10 06:41:56 +00005243 case BTRFS_IOC_SNAP_CREATE_V2:
Li Zefanfa0d2b92010-12-20 15:53:28 +08005244 return btrfs_ioctl_snap_create_v2(file, argp, 0);
Chris Mason3de45862008-11-17 21:02:50 -05005245 case BTRFS_IOC_SUBVOL_CREATE:
Li Zefanfa0d2b92010-12-20 15:53:28 +08005246 return btrfs_ioctl_snap_create(file, argp, 1);
Arne Jansen6f72c7e2011-09-14 15:58:21 +02005247 case BTRFS_IOC_SUBVOL_CREATE_V2:
5248 return btrfs_ioctl_snap_create_v2(file, argp, 1);
Yan, Zheng76dda932009-09-21 16:00:26 -04005249 case BTRFS_IOC_SNAP_DESTROY:
5250 return btrfs_ioctl_snap_destroy(file, argp);
Li Zefan0caa1022010-12-20 16:30:25 +08005251 case BTRFS_IOC_SUBVOL_GETFLAGS:
5252 return btrfs_ioctl_subvol_getflags(file, argp);
5253 case BTRFS_IOC_SUBVOL_SETFLAGS:
5254 return btrfs_ioctl_subvol_setflags(file, argp);
Josef Bacik6ef5ed02009-12-11 21:11:29 +00005255 case BTRFS_IOC_DEFAULT_SUBVOL:
5256 return btrfs_ioctl_default_subvol(file, argp);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005257 case BTRFS_IOC_DEFRAG:
Chris Mason1e701a32010-03-11 09:42:04 -05005258 return btrfs_ioctl_defrag(file, NULL);
5259 case BTRFS_IOC_DEFRAG_RANGE:
5260 return btrfs_ioctl_defrag(file, argp);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005261 case BTRFS_IOC_RESIZE:
Miao Xie198605a2012-11-26 08:43:45 +00005262 return btrfs_ioctl_resize(file, argp);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005263 case BTRFS_IOC_ADD_DEV:
Christoph Hellwig4bcabaa2008-12-02 06:36:08 -05005264 return btrfs_ioctl_add_dev(root, argp);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005265 case BTRFS_IOC_RM_DEV:
Miao Xieda249272012-11-26 08:44:50 +00005266 return btrfs_ioctl_rm_dev(file, argp);
Jan Schmidt475f6382011-03-11 15:41:01 +01005267 case BTRFS_IOC_FS_INFO:
5268 return btrfs_ioctl_fs_info(root, argp);
5269 case BTRFS_IOC_DEV_INFO:
5270 return btrfs_ioctl_dev_info(root, argp);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005271 case BTRFS_IOC_BALANCE:
Liu Bo9ba1f6e2012-05-11 18:11:26 +08005272 return btrfs_ioctl_balance(file, NULL);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005273 case BTRFS_IOC_CLONE:
Sage Weilc5c9cd42008-11-12 14:32:25 -05005274 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
5275 case BTRFS_IOC_CLONE_RANGE:
Christoph Hellwig7a865e82008-12-02 09:52:24 -05005276 return btrfs_ioctl_clone_range(file, argp);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005277 case BTRFS_IOC_TRANS_START:
5278 return btrfs_ioctl_trans_start(file);
5279 case BTRFS_IOC_TRANS_END:
5280 return btrfs_ioctl_trans_end(file);
Chris Masonac8e9812010-02-28 15:39:26 -05005281 case BTRFS_IOC_TREE_SEARCH:
5282 return btrfs_ioctl_tree_search(file, argp);
Gerhard Heiftcc68a8a2014-01-30 16:24:03 +01005283 case BTRFS_IOC_TREE_SEARCH_V2:
5284 return btrfs_ioctl_tree_search_v2(file, argp);
Chris Masonac8e9812010-02-28 15:39:26 -05005285 case BTRFS_IOC_INO_LOOKUP:
5286 return btrfs_ioctl_ino_lookup(file, argp);
Jan Schmidtd7728c92011-07-07 16:48:38 +02005287 case BTRFS_IOC_INO_PATHS:
5288 return btrfs_ioctl_ino_to_path(root, argp);
5289 case BTRFS_IOC_LOGICAL_INO:
5290 return btrfs_ioctl_logical_to_ino(root, argp);
Josef Bacik1406e432010-01-13 18:19:06 +00005291 case BTRFS_IOC_SPACE_INFO:
5292 return btrfs_ioctl_space_info(root, argp);
Filipe David Borba Manana9b199852013-09-23 11:35:11 +01005293 case BTRFS_IOC_SYNC: {
5294 int ret;
5295
Miao Xie6c255e62014-03-06 13:55:01 +08005296 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
Filipe David Borba Manana9b199852013-09-23 11:35:11 +01005297 if (ret)
5298 return ret;
5299 ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
David Sterba2fad4e82014-07-23 14:39:35 +02005300 /*
5301 * The transaction thread may want to do more work,
5302 * namely it pokes the cleaner ktread that will start
5303 * processing uncleaned subvols.
5304 */
5305 wake_up_process(root->fs_info->transaction_kthread);
Filipe David Borba Manana9b199852013-09-23 11:35:11 +01005306 return ret;
5307 }
Sage Weil46204592010-10-29 15:41:32 -04005308 case BTRFS_IOC_START_SYNC:
Miao Xie9a8c28b2012-11-26 08:40:43 +00005309 return btrfs_ioctl_start_sync(root, argp);
Sage Weil46204592010-10-29 15:41:32 -04005310 case BTRFS_IOC_WAIT_SYNC:
Miao Xie9a8c28b2012-11-26 08:40:43 +00005311 return btrfs_ioctl_wait_sync(root, argp);
Jan Schmidt475f6382011-03-11 15:41:01 +01005312 case BTRFS_IOC_SCRUB:
Miao Xieb8e95482012-11-26 08:48:01 +00005313 return btrfs_ioctl_scrub(file, argp);
Jan Schmidt475f6382011-03-11 15:41:01 +01005314 case BTRFS_IOC_SCRUB_CANCEL:
5315 return btrfs_ioctl_scrub_cancel(root, argp);
5316 case BTRFS_IOC_SCRUB_PROGRESS:
5317 return btrfs_ioctl_scrub_progress(root, argp);
Ilya Dryomovc9e9f972012-01-16 22:04:47 +02005318 case BTRFS_IOC_BALANCE_V2:
Liu Bo9ba1f6e2012-05-11 18:11:26 +08005319 return btrfs_ioctl_balance(file, argp);
Ilya Dryomov837d5b62012-01-16 22:04:49 +02005320 case BTRFS_IOC_BALANCE_CTL:
5321 return btrfs_ioctl_balance_ctl(root, arg);
Ilya Dryomov19a39dc2012-01-16 22:04:49 +02005322 case BTRFS_IOC_BALANCE_PROGRESS:
5323 return btrfs_ioctl_balance_progress(root, argp);
Alexander Block8ea05e32012-07-25 17:35:53 +02005324 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5325 return btrfs_ioctl_set_received_subvol(file, argp);
Hugo Millsabccd002014-01-30 20:17:00 +00005326#ifdef CONFIG_64BIT
5327 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5328 return btrfs_ioctl_set_received_subvol_32(file, argp);
5329#endif
Alexander Block31db9f72012-07-25 23:19:24 +02005330 case BTRFS_IOC_SEND:
5331 return btrfs_ioctl_send(file, argp);
Stefan Behrensc11d2c22012-05-25 16:06:09 +02005332 case BTRFS_IOC_GET_DEV_STATS:
David Sterbab27f7c02012-06-22 06:30:39 -06005333 return btrfs_ioctl_get_dev_stats(root, argp);
Arne Jansen5d13a372011-09-14 15:53:51 +02005334 case BTRFS_IOC_QUOTA_CTL:
Miao Xie905b0dd2012-11-26 08:50:11 +00005335 return btrfs_ioctl_quota_ctl(file, argp);
Arne Jansen5d13a372011-09-14 15:53:51 +02005336 case BTRFS_IOC_QGROUP_ASSIGN:
Miao Xie905b0dd2012-11-26 08:50:11 +00005337 return btrfs_ioctl_qgroup_assign(file, argp);
Arne Jansen5d13a372011-09-14 15:53:51 +02005338 case BTRFS_IOC_QGROUP_CREATE:
Miao Xie905b0dd2012-11-26 08:50:11 +00005339 return btrfs_ioctl_qgroup_create(file, argp);
Arne Jansen5d13a372011-09-14 15:53:51 +02005340 case BTRFS_IOC_QGROUP_LIMIT:
Miao Xie905b0dd2012-11-26 08:50:11 +00005341 return btrfs_ioctl_qgroup_limit(file, argp);
Jan Schmidt2f232032013-04-25 16:04:51 +00005342 case BTRFS_IOC_QUOTA_RESCAN:
5343 return btrfs_ioctl_quota_rescan(file, argp);
5344 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5345 return btrfs_ioctl_quota_rescan_status(file, argp);
Jan Schmidt57254b6e2013-05-06 19:14:17 +00005346 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5347 return btrfs_ioctl_quota_rescan_wait(file, argp);
Stefan Behrens3f6bcfb2012-11-06 15:08:53 +01005348 case BTRFS_IOC_DEV_REPLACE:
5349 return btrfs_ioctl_dev_replace(root, argp);
jeff.liu867ab662013-01-05 02:48:01 +00005350 case BTRFS_IOC_GET_FSLABEL:
5351 return btrfs_ioctl_get_fslabel(file, argp);
jeff.liua8bfd4a2013-01-05 02:48:08 +00005352 case BTRFS_IOC_SET_FSLABEL:
5353 return btrfs_ioctl_set_fslabel(file, argp);
Mark Fasheh416161d2013-08-06 11:42:51 -07005354 case BTRFS_IOC_FILE_EXTENT_SAME:
5355 return btrfs_ioctl_file_extent_same(file, argp);
Jeff Mahoney2eaa0552013-11-15 15:33:55 -05005356 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5357 return btrfs_ioctl_get_supported_features(file, argp);
5358 case BTRFS_IOC_GET_FEATURES:
5359 return btrfs_ioctl_get_features(file, argp);
5360 case BTRFS_IOC_SET_FEATURES:
5361 return btrfs_ioctl_set_features(file, argp);
Christoph Hellwigf46b5a62008-06-11 21:53:53 -04005362 }
5363
5364 return -ENOTTY;
5365}