blob: aba43811d6ef1221c68b275afda0174f072343bf [file] [log] [blame]
Koji Sato7942b912009-04-06 19:01:41 -07001/*
2 * ioctl.c - NILFS ioctl operations.
3 *
4 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Koji Sato <koji@osrg.net>.
21 */
22
23#include <linux/fs.h>
24#include <linux/wait.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Koji Sato7942b912009-04-06 19:01:41 -070026#include <linux/capability.h> /* capable() */
27#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +090028#include <linux/vmalloc.h>
Ryusuke Konishi828b1c52011-02-03 21:26:17 +090029#include <linux/compat.h> /* compat_ptr() */
Al Viro2a79f172011-12-09 08:06:57 -050030#include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */
Ryusuke Konishiae191832011-02-04 01:19:38 +090031#include <linux/buffer_head.h>
Koji Sato7942b912009-04-06 19:01:41 -070032#include <linux/nilfs2_fs.h>
33#include "nilfs.h"
34#include "segment.h"
35#include "bmap.h"
36#include "cpfile.h"
37#include "sufile.h"
38#include "dat.h"
39
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -080040/**
41 * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
42 * @nilfs: nilfs object
43 * @argv: vector of arguments from userspace
44 * @dir: set of direction flags
45 * @dofunc: concrete function of get/set metadata info
46 *
47 * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
48 * calling dofunc() function on the basis of @argv argument.
49 *
50 * Return Value: On success, 0 is returned and requested metadata info
51 * is copied into userspace. On error, one of the following
52 * negative error codes is returned.
53 *
54 * %-EINVAL - Invalid arguments from userspace.
55 *
56 * %-ENOMEM - Insufficient amount of memory available.
57 *
58 * %-EFAULT - Failure during execution of requested operation.
59 */
Koji Sato7942b912009-04-06 19:01:41 -070060static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
61 struct nilfs_argv *argv, int dir,
62 ssize_t (*dofunc)(struct the_nilfs *,
Ryusuke Konishib028fcf2009-04-06 19:01:47 -070063 __u64 *, int,
Koji Sato7942b912009-04-06 19:01:41 -070064 void *, size_t, size_t))
65{
66 void *buf;
Ryusuke Konishidc498d02009-04-06 19:01:52 -070067 void __user *base = (void __user *)(unsigned long)argv->v_base;
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -070068 size_t maxmembs, total, n;
Koji Sato7942b912009-04-06 19:01:41 -070069 ssize_t nr;
70 int ret, i;
Ryusuke Konishib028fcf2009-04-06 19:01:47 -070071 __u64 pos, ppos;
Koji Sato7942b912009-04-06 19:01:41 -070072
73 if (argv->v_nmembs == 0)
74 return 0;
75
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -070076 if (argv->v_size > PAGE_SIZE)
77 return -EINVAL;
78
Wenliang Fan4b15d612014-01-23 15:55:22 -080079 /*
80 * Reject pairs of a start item position (argv->v_index) and a
81 * total count (argv->v_nmembs) which leads position 'pos' to
82 * overflow by the increment at the end of the loop.
83 */
84 if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
85 return -EINVAL;
86
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -070087 buf = (void *)__get_free_pages(GFP_NOFS, 0);
88 if (unlikely(!buf))
Koji Sato7942b912009-04-06 19:01:41 -070089 return -ENOMEM;
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -070090 maxmembs = PAGE_SIZE / argv->v_size;
Koji Sato7942b912009-04-06 19:01:41 -070091
92 ret = 0;
93 total = 0;
Ryusuke Konishib028fcf2009-04-06 19:01:47 -070094 pos = argv->v_index;
Koji Sato7942b912009-04-06 19:01:41 -070095 for (i = 0; i < argv->v_nmembs; i += n) {
96 n = (argv->v_nmembs - i < maxmembs) ?
97 argv->v_nmembs - i : maxmembs;
98 if ((dir & _IOC_WRITE) &&
Ryusuke Konishidc498d02009-04-06 19:01:52 -070099 copy_from_user(buf, base + argv->v_size * i,
100 argv->v_size * n)) {
Koji Sato7942b912009-04-06 19:01:41 -0700101 ret = -EFAULT;
102 break;
103 }
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700104 ppos = pos;
Pekka Enberg8acfbf02009-04-06 19:01:49 -0700105 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700106 n);
Koji Sato7942b912009-04-06 19:01:41 -0700107 if (nr < 0) {
108 ret = nr;
109 break;
110 }
111 if ((dir & _IOC_READ) &&
Ryusuke Konishidc498d02009-04-06 19:01:52 -0700112 copy_to_user(base + argv->v_size * i, buf,
113 argv->v_size * nr)) {
Koji Sato7942b912009-04-06 19:01:41 -0700114 ret = -EFAULT;
115 break;
116 }
117 total += nr;
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700118 if ((size_t)nr < n)
119 break;
120 if (pos == ppos)
121 pos += n;
Koji Sato7942b912009-04-06 19:01:41 -0700122 }
123 argv->v_nmembs = total;
124
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -0700125 free_pages((unsigned long)buf, 0);
Koji Sato7942b912009-04-06 19:01:41 -0700126 return ret;
127}
128
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800129/**
130 * nilfs_ioctl_getflags - ioctl to support lsattr
131 */
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900132static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
133{
134 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
135
136 return put_user(flags, (int __user *)argp);
137}
138
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800139/**
140 * nilfs_ioctl_setflags - ioctl to support chattr
141 */
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900142static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
143 void __user *argp)
144{
145 struct nilfs_transaction_info ti;
146 unsigned int flags, oldflags;
147 int ret;
148
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700149 if (!inode_owner_or_capable(inode))
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900150 return -EACCES;
151
152 if (get_user(flags, (int __user *)argp))
153 return -EFAULT;
154
Al Viroa561be72011-11-23 11:57:51 -0500155 ret = mnt_want_write_file(filp);
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900156 if (ret)
157 return ret;
158
159 flags = nilfs_mask_flags(inode->i_mode, flags);
160
161 mutex_lock(&inode->i_mutex);
162
163 oldflags = NILFS_I(inode)->i_flags;
164
165 /*
166 * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
167 * relevant capability.
168 */
169 ret = -EPERM;
170 if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
171 !capable(CAP_LINUX_IMMUTABLE))
172 goto out;
173
174 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
175 if (ret)
176 goto out;
177
178 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
179 (flags & FS_FL_USER_MODIFIABLE);
180
181 nilfs_set_inode_flags(inode);
182 inode->i_ctime = CURRENT_TIME;
183 if (IS_SYNC(inode))
184 nilfs_set_transaction_flag(NILFS_TI_SYNC);
185
186 nilfs_mark_inode_dirty(inode);
187 ret = nilfs_transaction_commit(inode->i_sb);
188out:
189 mutex_unlock(&inode->i_mutex);
Al Viro2a79f172011-12-09 08:06:57 -0500190 mnt_drop_write_file(filp);
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900191 return ret;
192}
193
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800194/**
195 * nilfs_ioctl_getversion - get info about a file's version (generation number)
196 */
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900197static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
198{
199 return put_user(inode->i_generation, (int __user *)argp);
200}
201
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800202/**
203 * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
204 * @inode: inode object
205 * @filp: file object
206 * @cmd: ioctl's request code
207 * @argp: pointer on argument from userspace
208 *
209 * Description: nilfs_ioctl_change_cpmode() function changes mode of
210 * given checkpoint between checkpoint and snapshot state. This ioctl
211 * is used in chcp and mkcp utilities.
212 *
213 * Return Value: On success, 0 is returned and mode of a checkpoint is
214 * changed. On error, one of the following negative error codes
215 * is returned.
216 *
217 * %-EPERM - Operation not permitted.
218 *
219 * %-EFAULT - Failure during checkpoint mode changing.
220 */
Koji Sato7942b912009-04-06 19:01:41 -0700221static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
222 unsigned int cmd, void __user *argp)
223{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900224 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700225 struct nilfs_transaction_info ti;
226 struct nilfs_cpmode cpmode;
227 int ret;
228
229 if (!capable(CAP_SYS_ADMIN))
230 return -EPERM;
Ryusuke Konishi75124872010-01-26 13:59:40 +0900231
Al Viroa561be72011-11-23 11:57:51 -0500232 ret = mnt_want_write_file(filp);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900233 if (ret)
234 return ret;
235
236 ret = -EFAULT;
Koji Sato7942b912009-04-06 19:01:41 -0700237 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
Ryusuke Konishi75124872010-01-26 13:59:40 +0900238 goto out;
Koji Sato7942b912009-04-06 19:01:41 -0700239
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700240 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900241
Koji Sato7942b912009-04-06 19:01:41 -0700242 nilfs_transaction_begin(inode->i_sb, &ti, 0);
243 ret = nilfs_cpfile_change_cpmode(
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900244 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900245 if (unlikely(ret < 0))
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700246 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900247 else
248 nilfs_transaction_commit(inode->i_sb); /* never fails */
249
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700250 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900251out:
Al Viro2a79f172011-12-09 08:06:57 -0500252 mnt_drop_write_file(filp);
Koji Sato7942b912009-04-06 19:01:41 -0700253 return ret;
254}
255
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800256/**
257 * nilfs_ioctl_delete_checkpoint - remove checkpoint
258 * @inode: inode object
259 * @filp: file object
260 * @cmd: ioctl's request code
261 * @argp: pointer on argument from userspace
262 *
263 * Description: nilfs_ioctl_delete_checkpoint() function removes
264 * checkpoint from NILFS2 file system. This ioctl is used in rmcp
265 * utility.
266 *
267 * Return Value: On success, 0 is returned and a checkpoint is
268 * removed. On error, one of the following negative error codes
269 * is returned.
270 *
271 * %-EPERM - Operation not permitted.
272 *
273 * %-EFAULT - Failure during checkpoint removing.
274 */
Koji Sato7942b912009-04-06 19:01:41 -0700275static int
276nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
277 unsigned int cmd, void __user *argp)
278{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900279 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700280 struct nilfs_transaction_info ti;
281 __u64 cno;
282 int ret;
283
284 if (!capable(CAP_SYS_ADMIN))
285 return -EPERM;
Ryusuke Konishi75124872010-01-26 13:59:40 +0900286
Al Viroa561be72011-11-23 11:57:51 -0500287 ret = mnt_want_write_file(filp);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900288 if (ret)
289 return ret;
290
291 ret = -EFAULT;
Koji Sato7942b912009-04-06 19:01:41 -0700292 if (copy_from_user(&cno, argp, sizeof(cno)))
Ryusuke Konishi75124872010-01-26 13:59:40 +0900293 goto out;
Koji Sato7942b912009-04-06 19:01:41 -0700294
295 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900296 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900297 if (unlikely(ret < 0))
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700298 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900299 else
300 nilfs_transaction_commit(inode->i_sb); /* never fails */
301out:
Al Viro2a79f172011-12-09 08:06:57 -0500302 mnt_drop_write_file(filp);
Koji Sato7942b912009-04-06 19:01:41 -0700303 return ret;
304}
305
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800306/**
307 * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
308 * @nilfs: nilfs object
309 * @posp: pointer on array of checkpoint's numbers
310 * @flags: checkpoint mode (checkpoint or snapshot)
311 * @buf: buffer for storing checkponts' info
312 * @size: size in bytes of one checkpoint info item in array
313 * @nmembs: number of checkpoints in array (numbers and infos)
314 *
315 * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
316 * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
317 * lscp utility and by nilfs_cleanerd daemon.
318 *
319 * Return value: count of nilfs_cpinfo structures in output buffer.
320 */
Koji Sato7942b912009-04-06 19:01:41 -0700321static ssize_t
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700322nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
Koji Sato7942b912009-04-06 19:01:41 -0700323 void *buf, size_t size, size_t nmembs)
324{
Koji Sato7942b912009-04-06 19:01:41 -0700325 int ret;
326
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700327 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900328 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900329 size, nmembs);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700330 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700331 return ret;
332}
333
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800334/**
335 * nilfs_ioctl_get_cpstat - get checkpoints statistics
336 * @inode: inode object
337 * @filp: file object
338 * @cmd: ioctl's request code
339 * @argp: pointer on argument from userspace
340 *
341 * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
342 * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
343 * and by nilfs_cleanerd daemon.
344 *
345 * Return Value: On success, 0 is returned, and checkpoints information is
346 * copied into userspace pointer @argp. On error, one of the following
347 * negative error codes is returned.
348 *
349 * %-EIO - I/O error.
350 *
351 * %-ENOMEM - Insufficient amount of memory available.
352 *
353 * %-EFAULT - Failure during getting checkpoints statistics.
354 */
Koji Sato7942b912009-04-06 19:01:41 -0700355static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
356 unsigned int cmd, void __user *argp)
357{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900358 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700359 struct nilfs_cpstat cpstat;
Koji Sato7942b912009-04-06 19:01:41 -0700360 int ret;
361
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700362 down_read(&nilfs->ns_segctor_sem);
363 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
364 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700365 if (ret < 0)
366 return ret;
367
368 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
369 ret = -EFAULT;
370 return ret;
371}
372
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800373/**
374 * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
375 * @nilfs: nilfs object
376 * @posp: pointer on array of segment numbers
377 * @flags: *not used*
378 * @buf: buffer for storing suinfo array
379 * @size: size in bytes of one suinfo item in array
380 * @nmembs: count of segment numbers and suinfos in array
381 *
382 * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
383 * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
384 * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
385 *
386 * Return value: count of nilfs_suinfo structures in output buffer.
387 */
Koji Sato7942b912009-04-06 19:01:41 -0700388static ssize_t
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700389nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
Koji Sato7942b912009-04-06 19:01:41 -0700390 void *buf, size_t size, size_t nmembs)
391{
Koji Sato7942b912009-04-06 19:01:41 -0700392 int ret;
393
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700394 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900395 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
396 nmembs);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700397 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700398 return ret;
399}
400
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800401/**
402 * nilfs_ioctl_get_sustat - get segment usage statistics
403 * @inode: inode object
404 * @filp: file object
405 * @cmd: ioctl's request code
406 * @argp: pointer on argument from userspace
407 *
408 * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
409 * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
410 * and by nilfs_cleanerd daemon.
411 *
412 * Return Value: On success, 0 is returned, and segment usage information is
413 * copied into userspace pointer @argp. On error, one of the following
414 * negative error codes is returned.
415 *
416 * %-EIO - I/O error.
417 *
418 * %-ENOMEM - Insufficient amount of memory available.
419 *
420 * %-EFAULT - Failure during getting segment usage statistics.
421 */
Koji Sato7942b912009-04-06 19:01:41 -0700422static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
423 unsigned int cmd, void __user *argp)
424{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900425 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700426 struct nilfs_sustat sustat;
Koji Sato7942b912009-04-06 19:01:41 -0700427 int ret;
428
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700429 down_read(&nilfs->ns_segctor_sem);
430 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
431 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700432 if (ret < 0)
433 return ret;
434
435 if (copy_to_user(argp, &sustat, sizeof(sustat)))
436 ret = -EFAULT;
437 return ret;
438}
439
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800440/**
441 * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
442 * @nilfs: nilfs object
443 * @posp: *not used*
444 * @flags: *not used*
445 * @buf: buffer for storing array of nilfs_vinfo structures
446 * @size: size in bytes of one vinfo item in array
447 * @nmembs: count of vinfos in array
448 *
449 * Description: nilfs_ioctl_do_get_vinfo() function returns information
450 * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
451 * by nilfs_cleanerd daemon.
452 *
453 * Return value: count of nilfs_vinfo structures in output buffer.
454 */
Koji Sato7942b912009-04-06 19:01:41 -0700455static ssize_t
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700456nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
Koji Sato7942b912009-04-06 19:01:41 -0700457 void *buf, size_t size, size_t nmembs)
458{
Koji Sato7942b912009-04-06 19:01:41 -0700459 int ret;
460
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700461 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900462 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700463 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700464 return ret;
465}
466
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800467/**
468 * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
469 * @nilfs: nilfs object
470 * @posp: *not used*
471 * @flags: *not used*
472 * @buf: buffer for storing array of nilfs_bdesc structures
473 * @size: size in bytes of one bdesc item in array
474 * @nmembs: count of bdescs in array
475 *
476 * Description: nilfs_ioctl_do_get_bdescs() function returns information
477 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
478 * is used by nilfs_cleanerd daemon.
479 *
480 * Return value: count of nilfs_bdescs structures in output buffer.
481 */
Koji Sato7942b912009-04-06 19:01:41 -0700482static ssize_t
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700483nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
Koji Sato7942b912009-04-06 19:01:41 -0700484 void *buf, size_t size, size_t nmembs)
485{
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900486 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
Koji Sato7942b912009-04-06 19:01:41 -0700487 struct nilfs_bdesc *bdescs = buf;
488 int ret, i;
489
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900490 down_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700491 for (i = 0; i < nmembs; i++) {
492 ret = nilfs_bmap_lookup_at_level(bmap,
493 bdescs[i].bd_offset,
494 bdescs[i].bd_level + 1,
495 &bdescs[i].bd_blocknr);
496 if (ret < 0) {
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900497 if (ret != -ENOENT) {
498 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700499 return ret;
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900500 }
Koji Sato7942b912009-04-06 19:01:41 -0700501 bdescs[i].bd_blocknr = 0;
502 }
503 }
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900504 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700505 return nmembs;
506}
507
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800508/**
509 * nilfs_ioctl_get_bdescs - get disk block descriptors
510 * @inode: inode object
511 * @filp: file object
512 * @cmd: ioctl's request code
513 * @argp: pointer on argument from userspace
514 *
515 * Description: nilfs_ioctl_do_get_bdescs() function returns information
516 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
517 * is used by nilfs_cleanerd daemon.
518 *
519 * Return Value: On success, 0 is returned, and disk block descriptors are
520 * copied into userspace pointer @argp. On error, one of the following
521 * negative error codes is returned.
522 *
523 * %-EINVAL - Invalid arguments from userspace.
524 *
525 * %-EIO - I/O error.
526 *
527 * %-ENOMEM - Insufficient amount of memory available.
528 *
529 * %-EFAULT - Failure during getting disk block descriptors.
530 */
Koji Sato7942b912009-04-06 19:01:41 -0700531static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
532 unsigned int cmd, void __user *argp)
533{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900534 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700535 struct nilfs_argv argv;
Koji Sato7942b912009-04-06 19:01:41 -0700536 int ret;
537
538 if (copy_from_user(&argv, argp, sizeof(argv)))
539 return -EFAULT;
540
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +0900541 if (argv.v_size != sizeof(struct nilfs_bdesc))
542 return -EINVAL;
543
Koji Sato7942b912009-04-06 19:01:41 -0700544 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
545 nilfs_ioctl_do_get_bdescs);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700546 if (ret < 0)
547 return ret;
Koji Sato7942b912009-04-06 19:01:41 -0700548
549 if (copy_to_user(argp, &argv, sizeof(argv)))
550 ret = -EFAULT;
551 return ret;
552}
553
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800554/**
555 * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
556 * @inode: inode object
557 * @vdesc: descriptor of virtual block number
558 * @buffers: list of moving buffers
559 *
560 * Description: nilfs_ioctl_move_inode_block() function registers data/node
561 * buffer in the GC pagecache and submit read request.
562 *
563 * Return Value: On success, 0 is returned. On error, one of the following
564 * negative error codes is returned.
565 *
566 * %-EIO - I/O error.
567 *
568 * %-ENOMEM - Insufficient amount of memory available.
569 *
570 * %-ENOENT - Requested block doesn't exist.
571 *
572 * %-EEXIST - Blocks conflict is detected.
573 */
Koji Sato7942b912009-04-06 19:01:41 -0700574static int nilfs_ioctl_move_inode_block(struct inode *inode,
575 struct nilfs_vdesc *vdesc,
576 struct list_head *buffers)
577{
578 struct buffer_head *bh;
579 int ret;
580
581 if (vdesc->vd_flags == 0)
582 ret = nilfs_gccache_submit_read_data(
583 inode, vdesc->vd_offset, vdesc->vd_blocknr,
584 vdesc->vd_vblocknr, &bh);
585 else
586 ret = nilfs_gccache_submit_read_node(
587 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
588
589 if (unlikely(ret < 0)) {
590 if (ret == -ENOENT)
591 printk(KERN_CRIT
592 "%s: invalid virtual block address (%s): "
593 "ino=%llu, cno=%llu, offset=%llu, "
594 "blocknr=%llu, vblocknr=%llu\n",
595 __func__, vdesc->vd_flags ? "node" : "data",
596 (unsigned long long)vdesc->vd_ino,
597 (unsigned long long)vdesc->vd_cno,
598 (unsigned long long)vdesc->vd_offset,
599 (unsigned long long)vdesc->vd_blocknr,
600 (unsigned long long)vdesc->vd_vblocknr);
601 return ret;
602 }
Ryusuke Konishi5399dd12009-11-07 18:45:16 +0900603 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
604 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
605 "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
606 __func__, vdesc->vd_flags ? "node" : "data",
607 (unsigned long long)vdesc->vd_ino,
608 (unsigned long long)vdesc->vd_cno,
609 (unsigned long long)vdesc->vd_offset,
610 (unsigned long long)vdesc->vd_blocknr,
611 (unsigned long long)vdesc->vd_vblocknr);
612 brelse(bh);
613 return -EEXIST;
614 }
Koji Sato7942b912009-04-06 19:01:41 -0700615 list_add_tail(&bh->b_assoc_buffers, buffers);
616 return 0;
617}
618
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800619/**
620 * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
621 * @sb: superblock object
622 * @argv: vector of arguments from userspace
623 * @buf: array of nilfs_vdesc structures
624 *
625 * Description: nilfs_ioctl_move_blocks() function reads valid data/node
626 * blocks that garbage collector specified with the array of nilfs_vdesc
627 * structures and stores them into page caches of GC inodes.
628 *
629 * Return Value: Number of processed nilfs_vdesc structures or
630 * error code, otherwise.
631 */
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900632static int nilfs_ioctl_move_blocks(struct super_block *sb,
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900633 struct nilfs_argv *argv, void *buf)
Koji Sato7942b912009-04-06 19:01:41 -0700634{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900635 size_t nmembs = argv->v_nmembs;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900636 struct the_nilfs *nilfs = sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700637 struct inode *inode;
638 struct nilfs_vdesc *vdesc;
639 struct buffer_head *bh, *n;
640 LIST_HEAD(buffers);
641 ino_t ino;
642 __u64 cno;
643 int i, ret;
644
645 for (i = 0, vdesc = buf; i < nmembs; ) {
646 ino = vdesc->vd_ino;
647 cno = vdesc->vd_cno;
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900648 inode = nilfs_iget_for_gc(sb, ino, cno);
Dan Carpenter103cfcf2010-11-23 09:26:02 +0300649 if (IS_ERR(inode)) {
650 ret = PTR_ERR(inode);
Koji Sato7942b912009-04-06 19:01:41 -0700651 goto failed;
652 }
Ryusuke Konishi947b10a2010-12-16 09:57:57 +0900653 if (list_empty(&NILFS_I(inode)->i_dirty)) {
654 /*
655 * Add the inode to GC inode list. Garbage Collection
656 * is serialized and no two processes manipulate the
657 * list simultaneously.
658 */
659 igrab(inode);
660 list_add(&NILFS_I(inode)->i_dirty,
661 &nilfs->ns_gc_inodes);
662 }
663
Koji Sato7942b912009-04-06 19:01:41 -0700664 do {
665 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
666 &buffers);
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900667 if (unlikely(ret < 0)) {
668 iput(inode);
Koji Sato7942b912009-04-06 19:01:41 -0700669 goto failed;
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900670 }
Koji Sato7942b912009-04-06 19:01:41 -0700671 vdesc++;
672 } while (++i < nmembs &&
673 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900674
675 iput(inode); /* The inode still remains in GC inode list */
Koji Sato7942b912009-04-06 19:01:41 -0700676 }
677
678 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
679 ret = nilfs_gccache_wait_and_mark_dirty(bh);
680 if (unlikely(ret < 0)) {
Ryusuke Konishi5399dd12009-11-07 18:45:16 +0900681 WARN_ON(ret == -EEXIST);
Koji Sato7942b912009-04-06 19:01:41 -0700682 goto failed;
683 }
684 list_del_init(&bh->b_assoc_buffers);
Koji Sato7942b912009-04-06 19:01:41 -0700685 brelse(bh);
686 }
687 return nmembs;
688
689 failed:
690 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
691 list_del_init(&bh->b_assoc_buffers);
Koji Sato7942b912009-04-06 19:01:41 -0700692 brelse(bh);
693 }
694 return ret;
695}
696
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800697/**
698 * nilfs_ioctl_delete_checkpoints - delete checkpoints
699 * @nilfs: nilfs object
700 * @argv: vector of arguments from userspace
701 * @buf: array of periods of checkpoints numbers
702 *
703 * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
704 * in the period from p_start to p_end, excluding p_end itself. The checkpoints
705 * which have been already deleted are ignored.
706 *
707 * Return Value: Number of processed nilfs_period structures or
708 * error code, otherwise.
709 *
710 * %-EIO - I/O error.
711 *
712 * %-ENOMEM - Insufficient amount of memory available.
713 *
714 * %-EINVAL - invalid checkpoints.
715 */
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900716static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
717 struct nilfs_argv *argv, void *buf)
Koji Sato7942b912009-04-06 19:01:41 -0700718{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900719 size_t nmembs = argv->v_nmembs;
Koji Sato7942b912009-04-06 19:01:41 -0700720 struct inode *cpfile = nilfs->ns_cpfile;
721 struct nilfs_period *periods = buf;
722 int ret, i;
723
724 for (i = 0; i < nmembs; i++) {
725 ret = nilfs_cpfile_delete_checkpoints(
726 cpfile, periods[i].p_start, periods[i].p_end);
727 if (ret < 0)
728 return ret;
729 }
730 return nmembs;
731}
732
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800733/**
734 * nilfs_ioctl_free_vblocknrs - free virtual block numbers
735 * @nilfs: nilfs object
736 * @argv: vector of arguments from userspace
737 * @buf: array of virtual block numbers
738 *
739 * Description: nilfs_ioctl_free_vblocknrs() function frees
740 * the virtual block numbers specified by @buf and @argv->v_nmembs.
741 *
742 * Return Value: Number of processed virtual block numbers or
743 * error code, otherwise.
744 *
745 * %-EIO - I/O error.
746 *
747 * %-ENOMEM - Insufficient amount of memory available.
748 *
749 * %-ENOENT - The virtual block number have not been allocated.
750 */
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900751static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
752 struct nilfs_argv *argv, void *buf)
Koji Sato7942b912009-04-06 19:01:41 -0700753{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900754 size_t nmembs = argv->v_nmembs;
755 int ret;
Koji Sato7942b912009-04-06 19:01:41 -0700756
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900757 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
Koji Sato7942b912009-04-06 19:01:41 -0700758
759 return (ret < 0) ? ret : nmembs;
760}
761
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800762/**
763 * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
764 * @nilfs: nilfs object
765 * @argv: vector of arguments from userspace
766 * @buf: array of block descriptors
767 *
768 * Description: nilfs_ioctl_mark_blocks_dirty() function marks
769 * metadata file or data blocks as dirty.
770 *
771 * Return Value: Number of processed block descriptors or
772 * error code, otherwise.
773 *
774 * %-ENOMEM - Insufficient memory available.
775 *
776 * %-EIO - I/O error
777 *
778 * %-ENOENT - the specified block does not exist (hole block)
779 */
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900780static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
781 struct nilfs_argv *argv, void *buf)
Koji Sato7942b912009-04-06 19:01:41 -0700782{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900783 size_t nmembs = argv->v_nmembs;
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900784 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
Koji Sato7942b912009-04-06 19:01:41 -0700785 struct nilfs_bdesc *bdescs = buf;
786 int ret, i;
787
788 for (i = 0; i < nmembs; i++) {
789 /* XXX: use macro or inline func to check liveness */
790 ret = nilfs_bmap_lookup_at_level(bmap,
791 bdescs[i].bd_offset,
792 bdescs[i].bd_level + 1,
793 &bdescs[i].bd_blocknr);
794 if (ret < 0) {
795 if (ret != -ENOENT)
796 return ret;
797 bdescs[i].bd_blocknr = 0;
798 }
799 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
800 /* skip dead block */
801 continue;
802 if (bdescs[i].bd_level == 0) {
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900803 ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat,
Koji Sato7942b912009-04-06 19:01:41 -0700804 bdescs[i].bd_offset);
805 if (ret < 0) {
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700806 WARN_ON(ret == -ENOENT);
Koji Sato7942b912009-04-06 19:01:41 -0700807 return ret;
808 }
809 } else {
810 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
811 bdescs[i].bd_level);
812 if (ret < 0) {
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700813 WARN_ON(ret == -ENOENT);
Koji Sato7942b912009-04-06 19:01:41 -0700814 return ret;
815 }
816 }
817 }
818 return nmembs;
819}
820
Koji Sato7942b912009-04-06 19:01:41 -0700821int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900822 struct nilfs_argv *argv, void **kbufs)
Koji Sato7942b912009-04-06 19:01:41 -0700823{
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700824 const char *msg;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900825 int ret;
Koji Sato7942b912009-04-06 19:01:41 -0700826
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900827 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700828 if (ret < 0) {
829 /*
830 * can safely abort because checkpoints can be removed
831 * independently.
832 */
833 msg = "cannot delete checkpoints";
834 goto failed;
835 }
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900836 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700837 if (ret < 0) {
838 /*
839 * can safely abort because DAT file is updated atomically
840 * using a copy-on-write technique.
841 */
842 msg = "cannot delete virtual blocks from DAT file";
843 goto failed;
844 }
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900845 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700846 if (ret < 0) {
847 /*
848 * can safely abort because the operation is nondestructive.
849 */
850 msg = "cannot mark copying blocks dirty";
851 goto failed;
852 }
Koji Sato7942b912009-04-06 19:01:41 -0700853 return 0;
854
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700855 failed:
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700856 printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
857 msg, ret);
Koji Sato7942b912009-04-06 19:01:41 -0700858 return ret;
859}
860
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800861/**
862 * nilfs_ioctl_clean_segments - clean segments
863 * @inode: inode object
864 * @filp: file object
865 * @cmd: ioctl's request code
866 * @argp: pointer on argument from userspace
867 *
868 * Description: nilfs_ioctl_clean_segments() function makes garbage
869 * collection operation in the environment of requested parameters
870 * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
871 * nilfs_cleanerd daemon.
872 *
873 * Return Value: On success, 0 is returned or error code, otherwise.
874 */
Koji Sato7942b912009-04-06 19:01:41 -0700875static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
876 unsigned int cmd, void __user *argp)
877{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900878 struct nilfs_argv argv[5];
Tobias Klauser33e189b2009-12-23 13:57:47 +0100879 static const size_t argsz[5] = {
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900880 sizeof(struct nilfs_vdesc),
881 sizeof(struct nilfs_period),
882 sizeof(__u64),
883 sizeof(struct nilfs_bdesc),
884 sizeof(__u64),
885 };
886 void __user *base;
887 void *kbufs[5];
888 struct the_nilfs *nilfs;
889 size_t len, nsegs;
890 int n, ret;
891
Koji Sato7942b912009-04-06 19:01:41 -0700892 if (!capable(CAP_SYS_ADMIN))
893 return -EPERM;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900894
Al Viroa561be72011-11-23 11:57:51 -0500895 ret = mnt_want_write_file(filp);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900896 if (ret)
897 return ret;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900898
Ryusuke Konishi75124872010-01-26 13:59:40 +0900899 ret = -EFAULT;
900 if (copy_from_user(argv, argp, sizeof(argv)))
901 goto out;
902
903 ret = -EINVAL;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900904 nsegs = argv[4].v_nmembs;
905 if (argv[4].v_size != argsz[4])
Ryusuke Konishi75124872010-01-26 13:59:40 +0900906 goto out;
Xi Wang1ecd3c72012-02-08 17:13:37 -0800907 if (nsegs > UINT_MAX / sizeof(__u64))
908 goto out;
Ryusuke Konishi75124872010-01-26 13:59:40 +0900909
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900910 /*
911 * argv[4] points to segment numbers this ioctl cleans. We
912 * use kmalloc() for its buffer because memory used for the
913 * segment numbers is enough small.
914 */
915 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
916 nsegs * sizeof(__u64));
Ryusuke Konishi75124872010-01-26 13:59:40 +0900917 if (IS_ERR(kbufs[4])) {
918 ret = PTR_ERR(kbufs[4]);
919 goto out;
920 }
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900921 nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900922
923 for (n = 0; n < 4; n++) {
924 ret = -EINVAL;
925 if (argv[n].v_size != argsz[n])
926 goto out_free;
927
928 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
929 goto out_free;
930
Haogang Chen481fe172011-12-19 17:11:56 -0800931 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
932 goto out_free;
933
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900934 len = argv[n].v_size * argv[n].v_nmembs;
935 base = (void __user *)(unsigned long)argv[n].v_base;
936 if (len == 0) {
937 kbufs[n] = NULL;
938 continue;
939 }
940
941 kbufs[n] = vmalloc(len);
942 if (!kbufs[n]) {
943 ret = -ENOMEM;
944 goto out_free;
945 }
946 if (copy_from_user(kbufs[n], base, len)) {
947 ret = -EFAULT;
948 vfree(kbufs[n]);
949 goto out_free;
950 }
951 }
952
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900953 /*
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900954 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900955 * which will operates an inode list without blocking.
956 * To protect the list from concurrent operations,
957 * nilfs_ioctl_move_blocks should be atomic operation.
958 */
959 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
960 ret = -EBUSY;
961 goto out_free;
962 }
963
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900964 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900965 if (ret < 0)
966 printk(KERN_ERR "NILFS: GC failed during preparation: "
967 "cannot read source blocks: err=%d\n", ret);
Vyacheslav Dubeykoa9bae182013-02-04 14:28:41 -0800968 else {
969 if (nilfs_sb_need_update(nilfs))
970 set_nilfs_discontinued(nilfs);
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900971 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
Vyacheslav Dubeykoa9bae182013-02-04 14:28:41 -0800972 }
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900973
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900974 nilfs_remove_all_gcinodes(nilfs);
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900975 clear_nilfs_gc_running(nilfs);
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900976
Ryusuke Konishi75124872010-01-26 13:59:40 +0900977out_free:
Ryusuke Konishid50468532009-05-22 20:36:21 +0900978 while (--n >= 0)
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900979 vfree(kbufs[n]);
980 kfree(kbufs[4]);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900981out:
Al Viro2a79f172011-12-09 08:06:57 -0500982 mnt_drop_write_file(filp);
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900983 return ret;
Koji Sato7942b912009-04-06 19:01:41 -0700984}
985
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800986/**
987 * nilfs_ioctl_sync - make a checkpoint
988 * @inode: inode object
989 * @filp: file object
990 * @cmd: ioctl's request code
991 * @argp: pointer on argument from userspace
992 *
993 * Description: nilfs_ioctl_sync() function constructs a logical segment
994 * for checkpointing. This function guarantees that all modified data
995 * and metadata are written out to the device when it successfully
996 * returned.
997 *
998 * Return Value: On success, 0 is retured. On errors, one of the following
999 * negative error code is returned.
1000 *
1001 * %-EROFS - Read only filesystem.
1002 *
1003 * %-EIO - I/O error
1004 *
1005 * %-ENOSPC - No space left on device (only in a panic state).
1006 *
1007 * %-ERESTARTSYS - Interrupted.
1008 *
1009 * %-ENOMEM - Insufficient memory available.
1010 *
1011 * %-EFAULT - Failure during execution of requested operation.
1012 */
Koji Sato7942b912009-04-06 19:01:41 -07001013static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
1014 unsigned int cmd, void __user *argp)
1015{
1016 __u64 cno;
1017 int ret;
Jiro SEKIBA0d561f12010-02-20 19:47:49 +09001018 struct the_nilfs *nilfs;
Koji Sato7942b912009-04-06 19:01:41 -07001019
1020 ret = nilfs_construct_segment(inode->i_sb);
1021 if (ret < 0)
1022 return ret;
1023
Ryusuke Konishi11475972012-05-31 16:26:11 -07001024 nilfs = inode->i_sb->s_fs_info;
Andreas Rohnere2c76172014-10-13 15:53:20 -07001025 ret = nilfs_flush_device(nilfs);
1026 if (ret < 0)
1027 return ret;
Ryusuke Konishi11475972012-05-31 16:26:11 -07001028
Koji Sato7942b912009-04-06 19:01:41 -07001029 if (argp != NULL) {
Jiro SEKIBA0d561f12010-02-20 19:47:49 +09001030 down_read(&nilfs->ns_segctor_sem);
1031 cno = nilfs->ns_cno - 1;
1032 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -07001033 if (copy_to_user(argp, &cno, sizeof(cno)))
1034 return -EFAULT;
1035 }
1036 return 0;
1037}
1038
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -08001039/**
1040 * nilfs_ioctl_resize - resize NILFS2 volume
1041 * @inode: inode object
1042 * @filp: file object
1043 * @argp: pointer on argument from userspace
1044 *
1045 * Return Value: On success, 0 is returned or error code, otherwise.
1046 */
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +09001047static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1048 void __user *argp)
1049{
1050 __u64 newsize;
1051 int ret = -EPERM;
1052
1053 if (!capable(CAP_SYS_ADMIN))
1054 goto out;
1055
Al Viroa561be72011-11-23 11:57:51 -05001056 ret = mnt_want_write_file(filp);
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +09001057 if (ret)
1058 goto out;
1059
1060 ret = -EFAULT;
1061 if (copy_from_user(&newsize, argp, sizeof(newsize)))
1062 goto out_drop_write;
1063
1064 ret = nilfs_resize_fs(inode->i_sb, newsize);
1065
1066out_drop_write:
Al Viro2a79f172011-12-09 08:06:57 -05001067 mnt_drop_write_file(filp);
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +09001068out:
1069 return ret;
1070}
1071
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -08001072/**
Andreas Rohnerf9f32c42014-04-03 14:50:30 -07001073 * nilfs_ioctl_trim_fs() - trim ioctl handle function
1074 * @inode: inode object
1075 * @argp: pointer on argument from userspace
1076 *
1077 * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1078 * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1079 * performs the actual trim operation.
1080 *
1081 * Return Value: On success, 0 is returned or negative error code, otherwise.
1082 */
1083static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1084{
1085 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1086 struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
1087 struct fstrim_range range;
1088 int ret;
1089
1090 if (!capable(CAP_SYS_ADMIN))
1091 return -EPERM;
1092
1093 if (!blk_queue_discard(q))
1094 return -EOPNOTSUPP;
1095
1096 if (copy_from_user(&range, argp, sizeof(range)))
1097 return -EFAULT;
1098
1099 range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
1100
1101 down_read(&nilfs->ns_segctor_sem);
1102 ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1103 up_read(&nilfs->ns_segctor_sem);
1104
1105 if (ret < 0)
1106 return ret;
1107
1108 if (copy_to_user(argp, &range, sizeof(range)))
1109 return -EFAULT;
1110
1111 return 0;
1112}
1113
1114/**
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -08001115 * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1116 * @inode: inode object
1117 * @argp: pointer on argument from userspace
1118 *
1119 * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
1120 * of segments in bytes and upper limit of segments in bytes.
1121 * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1122 *
1123 * Return Value: On success, 0 is returned or error code, otherwise.
1124 */
Ryusuke Konishi619205d2011-05-05 01:23:57 +09001125static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1126{
1127 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1128 __u64 range[2];
1129 __u64 minseg, maxseg;
1130 unsigned long segbytes;
1131 int ret = -EPERM;
1132
1133 if (!capable(CAP_SYS_ADMIN))
1134 goto out;
1135
1136 ret = -EFAULT;
1137 if (copy_from_user(range, argp, sizeof(__u64[2])))
1138 goto out;
1139
1140 ret = -ERANGE;
1141 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
1142 goto out;
1143
1144 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1145
1146 minseg = range[0] + segbytes - 1;
1147 do_div(minseg, segbytes);
1148 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1149 do_div(maxseg, segbytes);
1150 maxseg--;
1151
1152 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1153out:
1154 return ret;
1155}
1156
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -08001157/**
1158 * nilfs_ioctl_get_info - wrapping function of get metadata info
1159 * @inode: inode object
1160 * @filp: file object
1161 * @cmd: ioctl's request code
1162 * @argp: pointer on argument from userspace
1163 * @membsz: size of an item in bytes
1164 * @dofunc: concrete function of getting metadata info
1165 *
1166 * Description: nilfs_ioctl_get_info() gets metadata info by means of
1167 * calling dofunc() function.
1168 *
1169 * Return Value: On success, 0 is returned and requested metadata info
1170 * is copied into userspace. On error, one of the following
1171 * negative error codes is returned.
1172 *
1173 * %-EINVAL - Invalid arguments from userspace.
1174 *
1175 * %-ENOMEM - Insufficient amount of memory available.
1176 *
1177 * %-EFAULT - Failure during execution of requested operation.
1178 */
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001179static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1180 unsigned int cmd, void __user *argp,
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001181 size_t membsz,
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001182 ssize_t (*dofunc)(struct the_nilfs *,
1183 __u64 *, int,
1184 void *, size_t, size_t))
1185
1186{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001187 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001188 struct nilfs_argv argv;
1189 int ret;
1190
1191 if (copy_from_user(&argv, argp, sizeof(argv)))
1192 return -EFAULT;
1193
Ryusuke Konishi003ff182009-05-12 03:58:47 +09001194 if (argv.v_size < membsz)
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001195 return -EINVAL;
1196
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001197 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1198 if (ret < 0)
1199 return ret;
1200
1201 if (copy_to_user(argp, &argv, sizeof(argv)))
1202 ret = -EFAULT;
1203 return ret;
1204}
1205
Andreas Rohner2cc88f32014-04-03 14:50:28 -07001206/**
1207 * nilfs_ioctl_set_suinfo - set segment usage info
1208 * @inode: inode object
1209 * @filp: file object
1210 * @cmd: ioctl's request code
1211 * @argp: pointer on argument from userspace
1212 *
1213 * Description: Expects an array of nilfs_suinfo_update structures
1214 * encapsulated in nilfs_argv and updates the segment usage info
1215 * according to the flags in nilfs_suinfo_update.
1216 *
1217 * Return Value: On success, 0 is returned. On error, one of the
1218 * following negative error codes is returned.
1219 *
1220 * %-EPERM - Not enough permissions
1221 *
1222 * %-EFAULT - Error copying input data
1223 *
1224 * %-EIO - I/O error.
1225 *
1226 * %-ENOMEM - Insufficient amount of memory available.
1227 *
1228 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1229 */
1230static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1231 unsigned int cmd, void __user *argp)
1232{
1233 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1234 struct nilfs_transaction_info ti;
1235 struct nilfs_argv argv;
1236 size_t len;
1237 void __user *base;
1238 void *kbuf;
1239 int ret;
1240
1241 if (!capable(CAP_SYS_ADMIN))
1242 return -EPERM;
1243
1244 ret = mnt_want_write_file(filp);
1245 if (ret)
1246 return ret;
1247
1248 ret = -EFAULT;
1249 if (copy_from_user(&argv, argp, sizeof(argv)))
1250 goto out;
1251
1252 ret = -EINVAL;
1253 if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1254 goto out;
1255
1256 if (argv.v_nmembs > nilfs->ns_nsegments)
1257 goto out;
1258
1259 if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1260 goto out;
1261
1262 len = argv.v_size * argv.v_nmembs;
1263 if (!len) {
1264 ret = 0;
1265 goto out;
1266 }
1267
1268 base = (void __user *)(unsigned long)argv.v_base;
1269 kbuf = vmalloc(len);
1270 if (!kbuf) {
1271 ret = -ENOMEM;
1272 goto out;
1273 }
1274
1275 if (copy_from_user(kbuf, base, len)) {
1276 ret = -EFAULT;
1277 goto out_free;
1278 }
1279
1280 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1281 ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1282 argv.v_nmembs);
1283 if (unlikely(ret < 0))
1284 nilfs_transaction_abort(inode->i_sb);
1285 else
1286 nilfs_transaction_commit(inode->i_sb); /* never fails */
1287
1288out_free:
1289 vfree(kbuf);
1290out:
1291 mnt_drop_write_file(filp);
1292 return ret;
1293}
1294
Ryusuke Konishi7a946192009-04-06 19:01:53 -07001295long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Koji Sato7942b912009-04-06 19:01:41 -07001296{
Al Viro496ad9a2013-01-23 17:07:38 -05001297 struct inode *inode = file_inode(filp);
Li Hong75323402010-03-31 15:41:00 +08001298 void __user *argp = (void __user *)arg;
Koji Sato7942b912009-04-06 19:01:41 -07001299
1300 switch (cmd) {
Ryusuke Konishicde98f02011-01-20 02:09:53 +09001301 case FS_IOC_GETFLAGS:
1302 return nilfs_ioctl_getflags(inode, argp);
1303 case FS_IOC_SETFLAGS:
1304 return nilfs_ioctl_setflags(inode, filp, argp);
1305 case FS_IOC_GETVERSION:
1306 return nilfs_ioctl_getversion(inode, argp);
Koji Sato7942b912009-04-06 19:01:41 -07001307 case NILFS_IOCTL_CHANGE_CPMODE:
1308 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1309 case NILFS_IOCTL_DELETE_CHECKPOINT:
1310 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1311 case NILFS_IOCTL_GET_CPINFO:
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001312 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001313 sizeof(struct nilfs_cpinfo),
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001314 nilfs_ioctl_do_get_cpinfo);
Koji Sato7942b912009-04-06 19:01:41 -07001315 case NILFS_IOCTL_GET_CPSTAT:
1316 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1317 case NILFS_IOCTL_GET_SUINFO:
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001318 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001319 sizeof(struct nilfs_suinfo),
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001320 nilfs_ioctl_do_get_suinfo);
Andreas Rohner2cc88f32014-04-03 14:50:28 -07001321 case NILFS_IOCTL_SET_SUINFO:
1322 return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
Koji Sato7942b912009-04-06 19:01:41 -07001323 case NILFS_IOCTL_GET_SUSTAT:
1324 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1325 case NILFS_IOCTL_GET_VINFO:
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001326 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001327 sizeof(struct nilfs_vinfo),
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001328 nilfs_ioctl_do_get_vinfo);
Koji Sato7942b912009-04-06 19:01:41 -07001329 case NILFS_IOCTL_GET_BDESCS:
1330 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1331 case NILFS_IOCTL_CLEAN_SEGMENTS:
1332 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
Koji Sato7942b912009-04-06 19:01:41 -07001333 case NILFS_IOCTL_SYNC:
1334 return nilfs_ioctl_sync(inode, filp, cmd, argp);
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +09001335 case NILFS_IOCTL_RESIZE:
1336 return nilfs_ioctl_resize(inode, filp, argp);
Ryusuke Konishi619205d2011-05-05 01:23:57 +09001337 case NILFS_IOCTL_SET_ALLOC_RANGE:
1338 return nilfs_ioctl_set_alloc_range(inode, argp);
Andreas Rohnerf9f32c42014-04-03 14:50:30 -07001339 case FITRIM:
1340 return nilfs_ioctl_trim_fs(inode, argp);
Koji Sato7942b912009-04-06 19:01:41 -07001341 default:
1342 return -ENOTTY;
1343 }
1344}
Ryusuke Konishi828b1c52011-02-03 21:26:17 +09001345
1346#ifdef CONFIG_COMPAT
1347long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1348{
1349 switch (cmd) {
1350 case FS_IOC32_GETFLAGS:
1351 cmd = FS_IOC_GETFLAGS;
1352 break;
1353 case FS_IOC32_SETFLAGS:
1354 cmd = FS_IOC_SETFLAGS;
1355 break;
1356 case FS_IOC32_GETVERSION:
1357 cmd = FS_IOC_GETVERSION;
1358 break;
Thomas Meyer695c60f2011-12-19 17:11:55 -08001359 case NILFS_IOCTL_CHANGE_CPMODE:
1360 case NILFS_IOCTL_DELETE_CHECKPOINT:
1361 case NILFS_IOCTL_GET_CPINFO:
1362 case NILFS_IOCTL_GET_CPSTAT:
1363 case NILFS_IOCTL_GET_SUINFO:
Andreas Rohner2cc88f32014-04-03 14:50:28 -07001364 case NILFS_IOCTL_SET_SUINFO:
Thomas Meyer695c60f2011-12-19 17:11:55 -08001365 case NILFS_IOCTL_GET_SUSTAT:
1366 case NILFS_IOCTL_GET_VINFO:
1367 case NILFS_IOCTL_GET_BDESCS:
1368 case NILFS_IOCTL_CLEAN_SEGMENTS:
1369 case NILFS_IOCTL_SYNC:
1370 case NILFS_IOCTL_RESIZE:
1371 case NILFS_IOCTL_SET_ALLOC_RANGE:
1372 break;
Ryusuke Konishi828b1c52011-02-03 21:26:17 +09001373 default:
1374 return -ENOIOCTLCMD;
1375 }
1376 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1377}
1378#endif