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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 *
Ryusuke Konishi4b420ab2016-05-23 16:23:09 -070016 * Written by Koji Sato.
Koji Sato7942b912009-04-06 19:01:41 -070017 */
18
19#include <linux/fs.h>
20#include <linux/wait.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Koji Sato7942b912009-04-06 19:01:41 -070022#include <linux/capability.h> /* capable() */
23#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +090024#include <linux/vmalloc.h>
Ryusuke Konishi828b1c52011-02-03 21:26:17 +090025#include <linux/compat.h> /* compat_ptr() */
Al Viro2a79f172011-12-09 08:06:57 -050026#include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */
Ryusuke Konishiae191832011-02-04 01:19:38 +090027#include <linux/buffer_head.h>
Koji Sato7942b912009-04-06 19:01:41 -070028#include <linux/nilfs2_fs.h>
29#include "nilfs.h"
30#include "segment.h"
31#include "bmap.h"
32#include "cpfile.h"
33#include "sufile.h"
34#include "dat.h"
35
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -080036/**
37 * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
38 * @nilfs: nilfs object
39 * @argv: vector of arguments from userspace
40 * @dir: set of direction flags
41 * @dofunc: concrete function of get/set metadata info
42 *
43 * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
44 * calling dofunc() function on the basis of @argv argument.
45 *
46 * Return Value: On success, 0 is returned and requested metadata info
47 * is copied into userspace. On error, one of the following
48 * negative error codes is returned.
49 *
50 * %-EINVAL - Invalid arguments from userspace.
51 *
52 * %-ENOMEM - Insufficient amount of memory available.
53 *
54 * %-EFAULT - Failure during execution of requested operation.
55 */
Koji Sato7942b912009-04-06 19:01:41 -070056static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
57 struct nilfs_argv *argv, int dir,
58 ssize_t (*dofunc)(struct the_nilfs *,
Ryusuke Konishib028fcf2009-04-06 19:01:47 -070059 __u64 *, int,
Koji Sato7942b912009-04-06 19:01:41 -070060 void *, size_t, size_t))
61{
62 void *buf;
Ryusuke Konishidc498d02009-04-06 19:01:52 -070063 void __user *base = (void __user *)(unsigned long)argv->v_base;
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -070064 size_t maxmembs, total, n;
Koji Sato7942b912009-04-06 19:01:41 -070065 ssize_t nr;
66 int ret, i;
Ryusuke Konishib028fcf2009-04-06 19:01:47 -070067 __u64 pos, ppos;
Koji Sato7942b912009-04-06 19:01:41 -070068
69 if (argv->v_nmembs == 0)
70 return 0;
71
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -070072 if (argv->v_size > PAGE_SIZE)
73 return -EINVAL;
74
Wenliang Fan4b15d612014-01-23 15:55:22 -080075 /*
76 * Reject pairs of a start item position (argv->v_index) and a
77 * total count (argv->v_nmembs) which leads position 'pos' to
78 * overflow by the increment at the end of the loop.
79 */
80 if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
81 return -EINVAL;
82
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -070083 buf = (void *)__get_free_pages(GFP_NOFS, 0);
84 if (unlikely(!buf))
Koji Sato7942b912009-04-06 19:01:41 -070085 return -ENOMEM;
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -070086 maxmembs = PAGE_SIZE / argv->v_size;
Koji Sato7942b912009-04-06 19:01:41 -070087
88 ret = 0;
89 total = 0;
Ryusuke Konishib028fcf2009-04-06 19:01:47 -070090 pos = argv->v_index;
Koji Sato7942b912009-04-06 19:01:41 -070091 for (i = 0; i < argv->v_nmembs; i += n) {
92 n = (argv->v_nmembs - i < maxmembs) ?
93 argv->v_nmembs - i : maxmembs;
94 if ((dir & _IOC_WRITE) &&
Ryusuke Konishidc498d02009-04-06 19:01:52 -070095 copy_from_user(buf, base + argv->v_size * i,
96 argv->v_size * n)) {
Koji Sato7942b912009-04-06 19:01:41 -070097 ret = -EFAULT;
98 break;
99 }
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700100 ppos = pos;
Pekka Enberg8acfbf02009-04-06 19:01:49 -0700101 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700102 n);
Koji Sato7942b912009-04-06 19:01:41 -0700103 if (nr < 0) {
104 ret = nr;
105 break;
106 }
107 if ((dir & _IOC_READ) &&
Ryusuke Konishidc498d02009-04-06 19:01:52 -0700108 copy_to_user(base + argv->v_size * i, buf,
109 argv->v_size * nr)) {
Koji Sato7942b912009-04-06 19:01:41 -0700110 ret = -EFAULT;
111 break;
112 }
113 total += nr;
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700114 if ((size_t)nr < n)
115 break;
116 if (pos == ppos)
117 pos += n;
Koji Sato7942b912009-04-06 19:01:41 -0700118 }
119 argv->v_nmembs = total;
120
Ryusuke Konishi3358b4a2009-04-06 19:01:43 -0700121 free_pages((unsigned long)buf, 0);
Koji Sato7942b912009-04-06 19:01:41 -0700122 return ret;
123}
124
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800125/**
126 * nilfs_ioctl_getflags - ioctl to support lsattr
127 */
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900128static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
129{
130 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
131
132 return put_user(flags, (int __user *)argp);
133}
134
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800135/**
136 * nilfs_ioctl_setflags - ioctl to support chattr
137 */
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900138static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
139 void __user *argp)
140{
141 struct nilfs_transaction_info ti;
142 unsigned int flags, oldflags;
143 int ret;
144
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700145 if (!inode_owner_or_capable(inode))
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900146 return -EACCES;
147
148 if (get_user(flags, (int __user *)argp))
149 return -EFAULT;
150
Al Viroa561be72011-11-23 11:57:51 -0500151 ret = mnt_want_write_file(filp);
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900152 if (ret)
153 return ret;
154
155 flags = nilfs_mask_flags(inode->i_mode, flags);
156
Al Viro59551022016-01-22 15:40:57 -0500157 inode_lock(inode);
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900158
159 oldflags = NILFS_I(inode)->i_flags;
160
161 /*
162 * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
163 * relevant capability.
164 */
165 ret = -EPERM;
166 if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
167 !capable(CAP_LINUX_IMMUTABLE))
168 goto out;
169
170 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
171 if (ret)
172 goto out;
173
174 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
175 (flags & FS_FL_USER_MODIFIABLE);
176
177 nilfs_set_inode_flags(inode);
178 inode->i_ctime = CURRENT_TIME;
179 if (IS_SYNC(inode))
180 nilfs_set_transaction_flag(NILFS_TI_SYNC);
181
182 nilfs_mark_inode_dirty(inode);
183 ret = nilfs_transaction_commit(inode->i_sb);
184out:
Al Viro59551022016-01-22 15:40:57 -0500185 inode_unlock(inode);
Al Viro2a79f172011-12-09 08:06:57 -0500186 mnt_drop_write_file(filp);
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900187 return ret;
188}
189
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800190/**
191 * nilfs_ioctl_getversion - get info about a file's version (generation number)
192 */
Ryusuke Konishicde98f02011-01-20 02:09:53 +0900193static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
194{
195 return put_user(inode->i_generation, (int __user *)argp);
196}
197
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800198/**
199 * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
200 * @inode: inode object
201 * @filp: file object
202 * @cmd: ioctl's request code
203 * @argp: pointer on argument from userspace
204 *
205 * Description: nilfs_ioctl_change_cpmode() function changes mode of
206 * given checkpoint between checkpoint and snapshot state. This ioctl
207 * is used in chcp and mkcp utilities.
208 *
209 * Return Value: On success, 0 is returned and mode of a checkpoint is
210 * changed. On error, one of the following negative error codes
211 * is returned.
212 *
213 * %-EPERM - Operation not permitted.
214 *
215 * %-EFAULT - Failure during checkpoint mode changing.
216 */
Koji Sato7942b912009-04-06 19:01:41 -0700217static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
218 unsigned int cmd, void __user *argp)
219{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900220 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700221 struct nilfs_transaction_info ti;
222 struct nilfs_cpmode cpmode;
223 int ret;
224
225 if (!capable(CAP_SYS_ADMIN))
226 return -EPERM;
Ryusuke Konishi75124872010-01-26 13:59:40 +0900227
Al Viroa561be72011-11-23 11:57:51 -0500228 ret = mnt_want_write_file(filp);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900229 if (ret)
230 return ret;
231
232 ret = -EFAULT;
Koji Sato7942b912009-04-06 19:01:41 -0700233 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
Ryusuke Konishi75124872010-01-26 13:59:40 +0900234 goto out;
Koji Sato7942b912009-04-06 19:01:41 -0700235
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700236 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900237
Koji Sato7942b912009-04-06 19:01:41 -0700238 nilfs_transaction_begin(inode->i_sb, &ti, 0);
239 ret = nilfs_cpfile_change_cpmode(
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900240 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900241 if (unlikely(ret < 0))
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700242 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900243 else
244 nilfs_transaction_commit(inode->i_sb); /* never fails */
245
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700246 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900247out:
Al Viro2a79f172011-12-09 08:06:57 -0500248 mnt_drop_write_file(filp);
Koji Sato7942b912009-04-06 19:01:41 -0700249 return ret;
250}
251
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800252/**
253 * nilfs_ioctl_delete_checkpoint - remove checkpoint
254 * @inode: inode object
255 * @filp: file object
256 * @cmd: ioctl's request code
257 * @argp: pointer on argument from userspace
258 *
259 * Description: nilfs_ioctl_delete_checkpoint() function removes
260 * checkpoint from NILFS2 file system. This ioctl is used in rmcp
261 * utility.
262 *
263 * Return Value: On success, 0 is returned and a checkpoint is
264 * removed. On error, one of the following negative error codes
265 * is returned.
266 *
267 * %-EPERM - Operation not permitted.
268 *
269 * %-EFAULT - Failure during checkpoint removing.
270 */
Koji Sato7942b912009-04-06 19:01:41 -0700271static int
272nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
273 unsigned int cmd, void __user *argp)
274{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900275 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700276 struct nilfs_transaction_info ti;
277 __u64 cno;
278 int ret;
279
280 if (!capable(CAP_SYS_ADMIN))
281 return -EPERM;
Ryusuke Konishi75124872010-01-26 13:59:40 +0900282
Al Viroa561be72011-11-23 11:57:51 -0500283 ret = mnt_want_write_file(filp);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900284 if (ret)
285 return ret;
286
287 ret = -EFAULT;
Koji Sato7942b912009-04-06 19:01:41 -0700288 if (copy_from_user(&cno, argp, sizeof(cno)))
Ryusuke Konishi75124872010-01-26 13:59:40 +0900289 goto out;
Koji Sato7942b912009-04-06 19:01:41 -0700290
291 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900292 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900293 if (unlikely(ret < 0))
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700294 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900295 else
296 nilfs_transaction_commit(inode->i_sb); /* never fails */
297out:
Al Viro2a79f172011-12-09 08:06:57 -0500298 mnt_drop_write_file(filp);
Koji Sato7942b912009-04-06 19:01:41 -0700299 return ret;
300}
301
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800302/**
303 * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
304 * @nilfs: nilfs object
305 * @posp: pointer on array of checkpoint's numbers
306 * @flags: checkpoint mode (checkpoint or snapshot)
307 * @buf: buffer for storing checkponts' info
308 * @size: size in bytes of one checkpoint info item in array
309 * @nmembs: number of checkpoints in array (numbers and infos)
310 *
311 * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
312 * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
313 * lscp utility and by nilfs_cleanerd daemon.
314 *
315 * Return value: count of nilfs_cpinfo structures in output buffer.
316 */
Koji Sato7942b912009-04-06 19:01:41 -0700317static ssize_t
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700318nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
Koji Sato7942b912009-04-06 19:01:41 -0700319 void *buf, size_t size, size_t nmembs)
320{
Koji Sato7942b912009-04-06 19:01:41 -0700321 int ret;
322
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700323 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900324 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900325 size, nmembs);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700326 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700327 return ret;
328}
329
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800330/**
331 * nilfs_ioctl_get_cpstat - get checkpoints statistics
332 * @inode: inode object
333 * @filp: file object
334 * @cmd: ioctl's request code
335 * @argp: pointer on argument from userspace
336 *
337 * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
338 * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
339 * and by nilfs_cleanerd daemon.
340 *
341 * Return Value: On success, 0 is returned, and checkpoints information is
342 * copied into userspace pointer @argp. On error, one of the following
343 * negative error codes is returned.
344 *
345 * %-EIO - I/O error.
346 *
347 * %-ENOMEM - Insufficient amount of memory available.
348 *
349 * %-EFAULT - Failure during getting checkpoints statistics.
350 */
Koji Sato7942b912009-04-06 19:01:41 -0700351static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
352 unsigned int cmd, void __user *argp)
353{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900354 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700355 struct nilfs_cpstat cpstat;
Koji Sato7942b912009-04-06 19:01:41 -0700356 int ret;
357
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700358 down_read(&nilfs->ns_segctor_sem);
359 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
360 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700361 if (ret < 0)
362 return ret;
363
364 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
365 ret = -EFAULT;
366 return ret;
367}
368
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800369/**
370 * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
371 * @nilfs: nilfs object
372 * @posp: pointer on array of segment numbers
373 * @flags: *not used*
374 * @buf: buffer for storing suinfo array
375 * @size: size in bytes of one suinfo item in array
376 * @nmembs: count of segment numbers and suinfos in array
377 *
378 * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
379 * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
380 * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
381 *
382 * Return value: count of nilfs_suinfo structures in output buffer.
383 */
Koji Sato7942b912009-04-06 19:01:41 -0700384static ssize_t
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700385nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
Koji Sato7942b912009-04-06 19:01:41 -0700386 void *buf, size_t size, size_t nmembs)
387{
Koji Sato7942b912009-04-06 19:01:41 -0700388 int ret;
389
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700390 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900391 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
392 nmembs);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700393 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700394 return ret;
395}
396
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800397/**
398 * nilfs_ioctl_get_sustat - get segment usage statistics
399 * @inode: inode object
400 * @filp: file object
401 * @cmd: ioctl's request code
402 * @argp: pointer on argument from userspace
403 *
404 * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
405 * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
406 * and by nilfs_cleanerd daemon.
407 *
408 * Return Value: On success, 0 is returned, and segment usage information is
409 * copied into userspace pointer @argp. On error, one of the following
410 * negative error codes is returned.
411 *
412 * %-EIO - I/O error.
413 *
414 * %-ENOMEM - Insufficient amount of memory available.
415 *
416 * %-EFAULT - Failure during getting segment usage statistics.
417 */
Koji Sato7942b912009-04-06 19:01:41 -0700418static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
419 unsigned int cmd, void __user *argp)
420{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900421 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700422 struct nilfs_sustat sustat;
Koji Sato7942b912009-04-06 19:01:41 -0700423 int ret;
424
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700425 down_read(&nilfs->ns_segctor_sem);
426 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
427 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700428 if (ret < 0)
429 return ret;
430
431 if (copy_to_user(argp, &sustat, sizeof(sustat)))
432 ret = -EFAULT;
433 return ret;
434}
435
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800436/**
437 * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
438 * @nilfs: nilfs object
439 * @posp: *not used*
440 * @flags: *not used*
441 * @buf: buffer for storing array of nilfs_vinfo structures
442 * @size: size in bytes of one vinfo item in array
443 * @nmembs: count of vinfos in array
444 *
445 * Description: nilfs_ioctl_do_get_vinfo() function returns information
446 * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
447 * by nilfs_cleanerd daemon.
448 *
449 * Return value: count of nilfs_vinfo structures in output buffer.
450 */
Koji Sato7942b912009-04-06 19:01:41 -0700451static ssize_t
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700452nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
Koji Sato7942b912009-04-06 19:01:41 -0700453 void *buf, size_t size, size_t nmembs)
454{
Koji Sato7942b912009-04-06 19:01:41 -0700455 int ret;
456
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700457 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900458 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700459 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700460 return ret;
461}
462
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800463/**
464 * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
465 * @nilfs: nilfs object
466 * @posp: *not used*
467 * @flags: *not used*
468 * @buf: buffer for storing array of nilfs_bdesc structures
469 * @size: size in bytes of one bdesc item in array
470 * @nmembs: count of bdescs in array
471 *
472 * Description: nilfs_ioctl_do_get_bdescs() function returns information
473 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
474 * is used by nilfs_cleanerd daemon.
475 *
476 * Return value: count of nilfs_bdescs structures in output buffer.
477 */
Koji Sato7942b912009-04-06 19:01:41 -0700478static ssize_t
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700479nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
Koji Sato7942b912009-04-06 19:01:41 -0700480 void *buf, size_t size, size_t nmembs)
481{
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900482 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
Koji Sato7942b912009-04-06 19:01:41 -0700483 struct nilfs_bdesc *bdescs = buf;
484 int ret, i;
485
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900486 down_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700487 for (i = 0; i < nmembs; i++) {
488 ret = nilfs_bmap_lookup_at_level(bmap,
489 bdescs[i].bd_offset,
490 bdescs[i].bd_level + 1,
491 &bdescs[i].bd_blocknr);
492 if (ret < 0) {
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900493 if (ret != -ENOENT) {
494 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700495 return ret;
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900496 }
Koji Sato7942b912009-04-06 19:01:41 -0700497 bdescs[i].bd_blocknr = 0;
498 }
499 }
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +0900500 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -0700501 return nmembs;
502}
503
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800504/**
505 * nilfs_ioctl_get_bdescs - get disk block descriptors
506 * @inode: inode object
507 * @filp: file object
508 * @cmd: ioctl's request code
509 * @argp: pointer on argument from userspace
510 *
511 * Description: nilfs_ioctl_do_get_bdescs() function returns information
512 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
513 * is used by nilfs_cleanerd daemon.
514 *
515 * Return Value: On success, 0 is returned, and disk block descriptors are
516 * copied into userspace pointer @argp. On error, one of the following
517 * negative error codes is returned.
518 *
519 * %-EINVAL - Invalid arguments from userspace.
520 *
521 * %-EIO - I/O error.
522 *
523 * %-ENOMEM - Insufficient amount of memory available.
524 *
525 * %-EFAULT - Failure during getting disk block descriptors.
526 */
Koji Sato7942b912009-04-06 19:01:41 -0700527static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
528 unsigned int cmd, void __user *argp)
529{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900530 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700531 struct nilfs_argv argv;
Koji Sato7942b912009-04-06 19:01:41 -0700532 int ret;
533
534 if (copy_from_user(&argv, argp, sizeof(argv)))
535 return -EFAULT;
536
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +0900537 if (argv.v_size != sizeof(struct nilfs_bdesc))
538 return -EINVAL;
539
Koji Sato7942b912009-04-06 19:01:41 -0700540 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
541 nilfs_ioctl_do_get_bdescs);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700542 if (ret < 0)
543 return ret;
Koji Sato7942b912009-04-06 19:01:41 -0700544
545 if (copy_to_user(argp, &argv, sizeof(argv)))
546 ret = -EFAULT;
547 return ret;
548}
549
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800550/**
551 * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
552 * @inode: inode object
553 * @vdesc: descriptor of virtual block number
554 * @buffers: list of moving buffers
555 *
556 * Description: nilfs_ioctl_move_inode_block() function registers data/node
557 * buffer in the GC pagecache and submit read request.
558 *
559 * Return Value: On success, 0 is returned. On error, one of the following
560 * negative error codes is returned.
561 *
562 * %-EIO - I/O error.
563 *
564 * %-ENOMEM - Insufficient amount of memory available.
565 *
566 * %-ENOENT - Requested block doesn't exist.
567 *
568 * %-EEXIST - Blocks conflict is detected.
569 */
Koji Sato7942b912009-04-06 19:01:41 -0700570static int nilfs_ioctl_move_inode_block(struct inode *inode,
571 struct nilfs_vdesc *vdesc,
572 struct list_head *buffers)
573{
574 struct buffer_head *bh;
575 int ret;
576
577 if (vdesc->vd_flags == 0)
578 ret = nilfs_gccache_submit_read_data(
579 inode, vdesc->vd_offset, vdesc->vd_blocknr,
580 vdesc->vd_vblocknr, &bh);
581 else
582 ret = nilfs_gccache_submit_read_node(
583 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
584
585 if (unlikely(ret < 0)) {
586 if (ret == -ENOENT)
587 printk(KERN_CRIT
588 "%s: invalid virtual block address (%s): "
589 "ino=%llu, cno=%llu, offset=%llu, "
590 "blocknr=%llu, vblocknr=%llu\n",
591 __func__, vdesc->vd_flags ? "node" : "data",
592 (unsigned long long)vdesc->vd_ino,
593 (unsigned long long)vdesc->vd_cno,
594 (unsigned long long)vdesc->vd_offset,
595 (unsigned long long)vdesc->vd_blocknr,
596 (unsigned long long)vdesc->vd_vblocknr);
597 return ret;
598 }
Ryusuke Konishi5399dd12009-11-07 18:45:16 +0900599 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
600 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
601 "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
602 __func__, vdesc->vd_flags ? "node" : "data",
603 (unsigned long long)vdesc->vd_ino,
604 (unsigned long long)vdesc->vd_cno,
605 (unsigned long long)vdesc->vd_offset,
606 (unsigned long long)vdesc->vd_blocknr,
607 (unsigned long long)vdesc->vd_vblocknr);
608 brelse(bh);
609 return -EEXIST;
610 }
Koji Sato7942b912009-04-06 19:01:41 -0700611 list_add_tail(&bh->b_assoc_buffers, buffers);
612 return 0;
613}
614
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800615/**
616 * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
617 * @sb: superblock object
618 * @argv: vector of arguments from userspace
619 * @buf: array of nilfs_vdesc structures
620 *
621 * Description: nilfs_ioctl_move_blocks() function reads valid data/node
622 * blocks that garbage collector specified with the array of nilfs_vdesc
623 * structures and stores them into page caches of GC inodes.
624 *
625 * Return Value: Number of processed nilfs_vdesc structures or
626 * error code, otherwise.
627 */
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900628static int nilfs_ioctl_move_blocks(struct super_block *sb,
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900629 struct nilfs_argv *argv, void *buf)
Koji Sato7942b912009-04-06 19:01:41 -0700630{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900631 size_t nmembs = argv->v_nmembs;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900632 struct the_nilfs *nilfs = sb->s_fs_info;
Koji Sato7942b912009-04-06 19:01:41 -0700633 struct inode *inode;
634 struct nilfs_vdesc *vdesc;
635 struct buffer_head *bh, *n;
636 LIST_HEAD(buffers);
637 ino_t ino;
638 __u64 cno;
639 int i, ret;
640
641 for (i = 0, vdesc = buf; i < nmembs; ) {
642 ino = vdesc->vd_ino;
643 cno = vdesc->vd_cno;
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900644 inode = nilfs_iget_for_gc(sb, ino, cno);
Dan Carpenter103cfcf2010-11-23 09:26:02 +0300645 if (IS_ERR(inode)) {
646 ret = PTR_ERR(inode);
Koji Sato7942b912009-04-06 19:01:41 -0700647 goto failed;
648 }
Ryusuke Konishi947b10a2010-12-16 09:57:57 +0900649 if (list_empty(&NILFS_I(inode)->i_dirty)) {
650 /*
651 * Add the inode to GC inode list. Garbage Collection
652 * is serialized and no two processes manipulate the
653 * list simultaneously.
654 */
655 igrab(inode);
656 list_add(&NILFS_I(inode)->i_dirty,
657 &nilfs->ns_gc_inodes);
658 }
659
Koji Sato7942b912009-04-06 19:01:41 -0700660 do {
661 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
662 &buffers);
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900663 if (unlikely(ret < 0)) {
664 iput(inode);
Koji Sato7942b912009-04-06 19:01:41 -0700665 goto failed;
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900666 }
Koji Sato7942b912009-04-06 19:01:41 -0700667 vdesc++;
668 } while (++i < nmembs &&
669 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900670
671 iput(inode); /* The inode still remains in GC inode list */
Koji Sato7942b912009-04-06 19:01:41 -0700672 }
673
674 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
675 ret = nilfs_gccache_wait_and_mark_dirty(bh);
676 if (unlikely(ret < 0)) {
Ryusuke Konishi5399dd12009-11-07 18:45:16 +0900677 WARN_ON(ret == -EEXIST);
Koji Sato7942b912009-04-06 19:01:41 -0700678 goto failed;
679 }
680 list_del_init(&bh->b_assoc_buffers);
Koji Sato7942b912009-04-06 19:01:41 -0700681 brelse(bh);
682 }
683 return nmembs;
684
685 failed:
686 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
687 list_del_init(&bh->b_assoc_buffers);
Koji Sato7942b912009-04-06 19:01:41 -0700688 brelse(bh);
689 }
690 return ret;
691}
692
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800693/**
694 * nilfs_ioctl_delete_checkpoints - delete checkpoints
695 * @nilfs: nilfs object
696 * @argv: vector of arguments from userspace
697 * @buf: array of periods of checkpoints numbers
698 *
699 * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
700 * in the period from p_start to p_end, excluding p_end itself. The checkpoints
701 * which have been already deleted are ignored.
702 *
703 * Return Value: Number of processed nilfs_period structures or
704 * error code, otherwise.
705 *
706 * %-EIO - I/O error.
707 *
708 * %-ENOMEM - Insufficient amount of memory available.
709 *
710 * %-EINVAL - invalid checkpoints.
711 */
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900712static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
713 struct nilfs_argv *argv, void *buf)
Koji Sato7942b912009-04-06 19:01:41 -0700714{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900715 size_t nmembs = argv->v_nmembs;
Koji Sato7942b912009-04-06 19:01:41 -0700716 struct inode *cpfile = nilfs->ns_cpfile;
717 struct nilfs_period *periods = buf;
718 int ret, i;
719
720 for (i = 0; i < nmembs; i++) {
721 ret = nilfs_cpfile_delete_checkpoints(
722 cpfile, periods[i].p_start, periods[i].p_end);
723 if (ret < 0)
724 return ret;
725 }
726 return nmembs;
727}
728
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800729/**
730 * nilfs_ioctl_free_vblocknrs - free virtual block numbers
731 * @nilfs: nilfs object
732 * @argv: vector of arguments from userspace
733 * @buf: array of virtual block numbers
734 *
735 * Description: nilfs_ioctl_free_vblocknrs() function frees
736 * the virtual block numbers specified by @buf and @argv->v_nmembs.
737 *
738 * Return Value: Number of processed virtual block numbers or
739 * error code, otherwise.
740 *
741 * %-EIO - I/O error.
742 *
743 * %-ENOMEM - Insufficient amount of memory available.
744 *
745 * %-ENOENT - The virtual block number have not been allocated.
746 */
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900747static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
748 struct nilfs_argv *argv, void *buf)
Koji Sato7942b912009-04-06 19:01:41 -0700749{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900750 size_t nmembs = argv->v_nmembs;
751 int ret;
Koji Sato7942b912009-04-06 19:01:41 -0700752
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900753 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
Koji Sato7942b912009-04-06 19:01:41 -0700754
755 return (ret < 0) ? ret : nmembs;
756}
757
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800758/**
759 * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
760 * @nilfs: nilfs object
761 * @argv: vector of arguments from userspace
762 * @buf: array of block descriptors
763 *
764 * Description: nilfs_ioctl_mark_blocks_dirty() function marks
765 * metadata file or data blocks as dirty.
766 *
767 * Return Value: Number of processed block descriptors or
768 * error code, otherwise.
769 *
770 * %-ENOMEM - Insufficient memory available.
771 *
772 * %-EIO - I/O error
773 *
774 * %-ENOENT - the specified block does not exist (hole block)
775 */
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900776static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
777 struct nilfs_argv *argv, void *buf)
Koji Sato7942b912009-04-06 19:01:41 -0700778{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900779 size_t nmembs = argv->v_nmembs;
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900780 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
Koji Sato7942b912009-04-06 19:01:41 -0700781 struct nilfs_bdesc *bdescs = buf;
Ryusuke Konishi24e20ea2016-05-23 16:23:17 -0700782 struct buffer_head *bh;
Koji Sato7942b912009-04-06 19:01:41 -0700783 int ret, i;
784
785 for (i = 0; i < nmembs; i++) {
786 /* XXX: use macro or inline func to check liveness */
787 ret = nilfs_bmap_lookup_at_level(bmap,
788 bdescs[i].bd_offset,
789 bdescs[i].bd_level + 1,
790 &bdescs[i].bd_blocknr);
791 if (ret < 0) {
792 if (ret != -ENOENT)
793 return ret;
794 bdescs[i].bd_blocknr = 0;
795 }
796 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
797 /* skip dead block */
798 continue;
799 if (bdescs[i].bd_level == 0) {
Ryusuke Konishi24e20ea2016-05-23 16:23:17 -0700800 ret = nilfs_mdt_get_block(nilfs->ns_dat,
801 bdescs[i].bd_offset,
802 false, NULL, &bh);
803 if (unlikely(ret)) {
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700804 WARN_ON(ret == -ENOENT);
Koji Sato7942b912009-04-06 19:01:41 -0700805 return ret;
806 }
Ryusuke Konishi24e20ea2016-05-23 16:23:17 -0700807 mark_buffer_dirty(bh);
808 nilfs_mdt_mark_dirty(nilfs->ns_dat);
809 put_bh(bh);
Koji Sato7942b912009-04-06 19:01:41 -0700810 } else {
811 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
812 bdescs[i].bd_level);
813 if (ret < 0) {
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700814 WARN_ON(ret == -ENOENT);
Koji Sato7942b912009-04-06 19:01:41 -0700815 return ret;
816 }
817 }
818 }
819 return nmembs;
820}
821
Koji Sato7942b912009-04-06 19:01:41 -0700822int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900823 struct nilfs_argv *argv, void **kbufs)
Koji Sato7942b912009-04-06 19:01:41 -0700824{
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700825 const char *msg;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900826 int ret;
Koji Sato7942b912009-04-06 19:01:41 -0700827
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900828 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700829 if (ret < 0) {
830 /*
831 * can safely abort because checkpoints can be removed
832 * independently.
833 */
834 msg = "cannot delete checkpoints";
835 goto failed;
836 }
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900837 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700838 if (ret < 0) {
839 /*
840 * can safely abort because DAT file is updated atomically
841 * using a copy-on-write technique.
842 */
843 msg = "cannot delete virtual blocks from DAT file";
844 goto failed;
845 }
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900846 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700847 if (ret < 0) {
848 /*
849 * can safely abort because the operation is nondestructive.
850 */
851 msg = "cannot mark copying blocks dirty";
852 goto failed;
853 }
Koji Sato7942b912009-04-06 19:01:41 -0700854 return 0;
855
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700856 failed:
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700857 printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
858 msg, ret);
Koji Sato7942b912009-04-06 19:01:41 -0700859 return ret;
860}
861
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800862/**
863 * nilfs_ioctl_clean_segments - clean segments
864 * @inode: inode object
865 * @filp: file object
866 * @cmd: ioctl's request code
867 * @argp: pointer on argument from userspace
868 *
869 * Description: nilfs_ioctl_clean_segments() function makes garbage
870 * collection operation in the environment of requested parameters
871 * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
872 * nilfs_cleanerd daemon.
873 *
874 * Return Value: On success, 0 is returned or error code, otherwise.
875 */
Koji Sato7942b912009-04-06 19:01:41 -0700876static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
877 unsigned int cmd, void __user *argp)
878{
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900879 struct nilfs_argv argv[5];
Tobias Klauser33e189b2009-12-23 13:57:47 +0100880 static const size_t argsz[5] = {
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900881 sizeof(struct nilfs_vdesc),
882 sizeof(struct nilfs_period),
883 sizeof(__u64),
884 sizeof(struct nilfs_bdesc),
885 sizeof(__u64),
886 };
887 void __user *base;
888 void *kbufs[5];
889 struct the_nilfs *nilfs;
890 size_t len, nsegs;
891 int n, ret;
892
Koji Sato7942b912009-04-06 19:01:41 -0700893 if (!capable(CAP_SYS_ADMIN))
894 return -EPERM;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900895
Al Viroa561be72011-11-23 11:57:51 -0500896 ret = mnt_want_write_file(filp);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900897 if (ret)
898 return ret;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900899
Ryusuke Konishi75124872010-01-26 13:59:40 +0900900 ret = -EFAULT;
901 if (copy_from_user(argv, argp, sizeof(argv)))
902 goto out;
903
904 ret = -EINVAL;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900905 nsegs = argv[4].v_nmembs;
906 if (argv[4].v_size != argsz[4])
Ryusuke Konishi75124872010-01-26 13:59:40 +0900907 goto out;
Xi Wang1ecd3c72012-02-08 17:13:37 -0800908 if (nsegs > UINT_MAX / sizeof(__u64))
909 goto out;
Ryusuke Konishi75124872010-01-26 13:59:40 +0900910
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900911 /*
912 * argv[4] points to segment numbers this ioctl cleans. We
913 * use kmalloc() for its buffer because memory used for the
914 * segment numbers is enough small.
915 */
916 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
917 nsegs * sizeof(__u64));
Ryusuke Konishi75124872010-01-26 13:59:40 +0900918 if (IS_ERR(kbufs[4])) {
919 ret = PTR_ERR(kbufs[4]);
920 goto out;
921 }
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900922 nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900923
924 for (n = 0; n < 4; n++) {
925 ret = -EINVAL;
926 if (argv[n].v_size != argsz[n])
927 goto out_free;
928
929 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
930 goto out_free;
931
Haogang Chen481fe172011-12-19 17:11:56 -0800932 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
933 goto out_free;
934
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900935 len = argv[n].v_size * argv[n].v_nmembs;
936 base = (void __user *)(unsigned long)argv[n].v_base;
937 if (len == 0) {
938 kbufs[n] = NULL;
939 continue;
940 }
941
942 kbufs[n] = vmalloc(len);
943 if (!kbufs[n]) {
944 ret = -ENOMEM;
945 goto out_free;
946 }
947 if (copy_from_user(kbufs[n], base, len)) {
948 ret = -EFAULT;
949 vfree(kbufs[n]);
950 goto out_free;
951 }
952 }
953
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900954 /*
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900955 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900956 * which will operates an inode list without blocking.
957 * To protect the list from concurrent operations,
958 * nilfs_ioctl_move_blocks should be atomic operation.
959 */
960 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
961 ret = -EBUSY;
962 goto out_free;
963 }
964
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900965 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900966 if (ret < 0)
967 printk(KERN_ERR "NILFS: GC failed during preparation: "
968 "cannot read source blocks: err=%d\n", ret);
Vyacheslav Dubeykoa9bae182013-02-04 14:28:41 -0800969 else {
970 if (nilfs_sb_need_update(nilfs))
971 set_nilfs_discontinued(nilfs);
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900972 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
Vyacheslav Dubeykoa9bae182013-02-04 14:28:41 -0800973 }
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900974
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900975 nilfs_remove_all_gcinodes(nilfs);
Jiro SEKIBA1cf58fa2009-09-03 22:24:17 +0900976 clear_nilfs_gc_running(nilfs);
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900977
Ryusuke Konishi75124872010-01-26 13:59:40 +0900978out_free:
Ryusuke Konishid50468532009-05-22 20:36:21 +0900979 while (--n >= 0)
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900980 vfree(kbufs[n]);
981 kfree(kbufs[4]);
Ryusuke Konishi75124872010-01-26 13:59:40 +0900982out:
Al Viro2a79f172011-12-09 08:06:57 -0500983 mnt_drop_write_file(filp);
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +0900984 return ret;
Koji Sato7942b912009-04-06 19:01:41 -0700985}
986
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -0800987/**
988 * nilfs_ioctl_sync - make a checkpoint
989 * @inode: inode object
990 * @filp: file object
991 * @cmd: ioctl's request code
992 * @argp: pointer on argument from userspace
993 *
994 * Description: nilfs_ioctl_sync() function constructs a logical segment
995 * for checkpointing. This function guarantees that all modified data
996 * and metadata are written out to the device when it successfully
997 * returned.
998 *
999 * Return Value: On success, 0 is retured. On errors, one of the following
1000 * negative error code is returned.
1001 *
1002 * %-EROFS - Read only filesystem.
1003 *
1004 * %-EIO - I/O error
1005 *
1006 * %-ENOSPC - No space left on device (only in a panic state).
1007 *
1008 * %-ERESTARTSYS - Interrupted.
1009 *
1010 * %-ENOMEM - Insufficient memory available.
1011 *
1012 * %-EFAULT - Failure during execution of requested operation.
1013 */
Koji Sato7942b912009-04-06 19:01:41 -07001014static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
1015 unsigned int cmd, void __user *argp)
1016{
1017 __u64 cno;
1018 int ret;
Jiro SEKIBA0d561f12010-02-20 19:47:49 +09001019 struct the_nilfs *nilfs;
Koji Sato7942b912009-04-06 19:01:41 -07001020
1021 ret = nilfs_construct_segment(inode->i_sb);
1022 if (ret < 0)
1023 return ret;
1024
Ryusuke Konishi11475972012-05-31 16:26:11 -07001025 nilfs = inode->i_sb->s_fs_info;
Andreas Rohnere2c76172014-10-13 15:53:20 -07001026 ret = nilfs_flush_device(nilfs);
1027 if (ret < 0)
1028 return ret;
Ryusuke Konishi11475972012-05-31 16:26:11 -07001029
Koji Sato7942b912009-04-06 19:01:41 -07001030 if (argp != NULL) {
Jiro SEKIBA0d561f12010-02-20 19:47:49 +09001031 down_read(&nilfs->ns_segctor_sem);
1032 cno = nilfs->ns_cno - 1;
1033 up_read(&nilfs->ns_segctor_sem);
Koji Sato7942b912009-04-06 19:01:41 -07001034 if (copy_to_user(argp, &cno, sizeof(cno)))
1035 return -EFAULT;
1036 }
1037 return 0;
1038}
1039
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -08001040/**
1041 * nilfs_ioctl_resize - resize NILFS2 volume
1042 * @inode: inode object
1043 * @filp: file object
1044 * @argp: pointer on argument from userspace
1045 *
1046 * Return Value: On success, 0 is returned or error code, otherwise.
1047 */
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +09001048static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1049 void __user *argp)
1050{
1051 __u64 newsize;
1052 int ret = -EPERM;
1053
1054 if (!capable(CAP_SYS_ADMIN))
1055 goto out;
1056
Al Viroa561be72011-11-23 11:57:51 -05001057 ret = mnt_want_write_file(filp);
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +09001058 if (ret)
1059 goto out;
1060
1061 ret = -EFAULT;
1062 if (copy_from_user(&newsize, argp, sizeof(newsize)))
1063 goto out_drop_write;
1064
1065 ret = nilfs_resize_fs(inode->i_sb, newsize);
1066
1067out_drop_write:
Al Viro2a79f172011-12-09 08:06:57 -05001068 mnt_drop_write_file(filp);
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +09001069out:
1070 return ret;
1071}
1072
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -08001073/**
Andreas Rohnerf9f32c42014-04-03 14:50:30 -07001074 * nilfs_ioctl_trim_fs() - trim ioctl handle function
1075 * @inode: inode object
1076 * @argp: pointer on argument from userspace
1077 *
1078 * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1079 * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1080 * performs the actual trim operation.
1081 *
1082 * Return Value: On success, 0 is returned or negative error code, otherwise.
1083 */
1084static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1085{
1086 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1087 struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
1088 struct fstrim_range range;
1089 int ret;
1090
1091 if (!capable(CAP_SYS_ADMIN))
1092 return -EPERM;
1093
1094 if (!blk_queue_discard(q))
1095 return -EOPNOTSUPP;
1096
1097 if (copy_from_user(&range, argp, sizeof(range)))
1098 return -EFAULT;
1099
1100 range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
1101
1102 down_read(&nilfs->ns_segctor_sem);
1103 ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1104 up_read(&nilfs->ns_segctor_sem);
1105
1106 if (ret < 0)
1107 return ret;
1108
1109 if (copy_to_user(argp, &range, sizeof(range)))
1110 return -EFAULT;
1111
1112 return 0;
1113}
1114
1115/**
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -08001116 * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1117 * @inode: inode object
1118 * @argp: pointer on argument from userspace
1119 *
1120 * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
1121 * of segments in bytes and upper limit of segments in bytes.
1122 * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1123 *
1124 * Return Value: On success, 0 is returned or error code, otherwise.
1125 */
Ryusuke Konishi619205d2011-05-05 01:23:57 +09001126static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1127{
1128 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1129 __u64 range[2];
1130 __u64 minseg, maxseg;
1131 unsigned long segbytes;
1132 int ret = -EPERM;
1133
1134 if (!capable(CAP_SYS_ADMIN))
1135 goto out;
1136
1137 ret = -EFAULT;
1138 if (copy_from_user(range, argp, sizeof(__u64[2])))
1139 goto out;
1140
1141 ret = -ERANGE;
1142 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
1143 goto out;
1144
1145 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1146
1147 minseg = range[0] + segbytes - 1;
1148 do_div(minseg, segbytes);
1149 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1150 do_div(maxseg, segbytes);
1151 maxseg--;
1152
1153 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1154out:
1155 return ret;
1156}
1157
Vyacheslav Dubeykod623a942014-01-23 15:55:23 -08001158/**
1159 * nilfs_ioctl_get_info - wrapping function of get metadata info
1160 * @inode: inode object
1161 * @filp: file object
1162 * @cmd: ioctl's request code
1163 * @argp: pointer on argument from userspace
1164 * @membsz: size of an item in bytes
1165 * @dofunc: concrete function of getting metadata info
1166 *
1167 * Description: nilfs_ioctl_get_info() gets metadata info by means of
1168 * calling dofunc() function.
1169 *
1170 * Return Value: On success, 0 is returned and requested metadata info
1171 * is copied into userspace. On error, one of the following
1172 * negative error codes is returned.
1173 *
1174 * %-EINVAL - Invalid arguments from userspace.
1175 *
1176 * %-ENOMEM - Insufficient amount of memory available.
1177 *
1178 * %-EFAULT - Failure during execution of requested operation.
1179 */
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001180static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1181 unsigned int cmd, void __user *argp,
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001182 size_t membsz,
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001183 ssize_t (*dofunc)(struct the_nilfs *,
1184 __u64 *, int,
1185 void *, size_t, size_t))
1186
1187{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001188 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001189 struct nilfs_argv argv;
1190 int ret;
1191
1192 if (copy_from_user(&argv, argp, sizeof(argv)))
1193 return -EFAULT;
1194
Ryusuke Konishi003ff182009-05-12 03:58:47 +09001195 if (argv.v_size < membsz)
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001196 return -EINVAL;
1197
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001198 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1199 if (ret < 0)
1200 return ret;
1201
1202 if (copy_to_user(argp, &argv, sizeof(argv)))
1203 ret = -EFAULT;
1204 return ret;
1205}
1206
Andreas Rohner2cc88f32014-04-03 14:50:28 -07001207/**
1208 * nilfs_ioctl_set_suinfo - set segment usage info
1209 * @inode: inode object
1210 * @filp: file object
1211 * @cmd: ioctl's request code
1212 * @argp: pointer on argument from userspace
1213 *
1214 * Description: Expects an array of nilfs_suinfo_update structures
1215 * encapsulated in nilfs_argv and updates the segment usage info
1216 * according to the flags in nilfs_suinfo_update.
1217 *
1218 * Return Value: On success, 0 is returned. On error, one of the
1219 * following negative error codes is returned.
1220 *
1221 * %-EPERM - Not enough permissions
1222 *
1223 * %-EFAULT - Error copying input data
1224 *
1225 * %-EIO - I/O error.
1226 *
1227 * %-ENOMEM - Insufficient amount of memory available.
1228 *
1229 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1230 */
1231static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1232 unsigned int cmd, void __user *argp)
1233{
1234 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1235 struct nilfs_transaction_info ti;
1236 struct nilfs_argv argv;
1237 size_t len;
1238 void __user *base;
1239 void *kbuf;
1240 int ret;
1241
1242 if (!capable(CAP_SYS_ADMIN))
1243 return -EPERM;
1244
1245 ret = mnt_want_write_file(filp);
1246 if (ret)
1247 return ret;
1248
1249 ret = -EFAULT;
1250 if (copy_from_user(&argv, argp, sizeof(argv)))
1251 goto out;
1252
1253 ret = -EINVAL;
1254 if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1255 goto out;
1256
1257 if (argv.v_nmembs > nilfs->ns_nsegments)
1258 goto out;
1259
1260 if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1261 goto out;
1262
1263 len = argv.v_size * argv.v_nmembs;
1264 if (!len) {
1265 ret = 0;
1266 goto out;
1267 }
1268
1269 base = (void __user *)(unsigned long)argv.v_base;
1270 kbuf = vmalloc(len);
1271 if (!kbuf) {
1272 ret = -ENOMEM;
1273 goto out;
1274 }
1275
1276 if (copy_from_user(kbuf, base, len)) {
1277 ret = -EFAULT;
1278 goto out_free;
1279 }
1280
1281 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1282 ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1283 argv.v_nmembs);
1284 if (unlikely(ret < 0))
1285 nilfs_transaction_abort(inode->i_sb);
1286 else
1287 nilfs_transaction_commit(inode->i_sb); /* never fails */
1288
1289out_free:
1290 vfree(kbuf);
1291out:
1292 mnt_drop_write_file(filp);
1293 return ret;
1294}
1295
Ryusuke Konishi7a946192009-04-06 19:01:53 -07001296long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Koji Sato7942b912009-04-06 19:01:41 -07001297{
Al Viro496ad9a2013-01-23 17:07:38 -05001298 struct inode *inode = file_inode(filp);
Li Hong75323402010-03-31 15:41:00 +08001299 void __user *argp = (void __user *)arg;
Koji Sato7942b912009-04-06 19:01:41 -07001300
1301 switch (cmd) {
Ryusuke Konishicde98f02011-01-20 02:09:53 +09001302 case FS_IOC_GETFLAGS:
1303 return nilfs_ioctl_getflags(inode, argp);
1304 case FS_IOC_SETFLAGS:
1305 return nilfs_ioctl_setflags(inode, filp, argp);
1306 case FS_IOC_GETVERSION:
1307 return nilfs_ioctl_getversion(inode, argp);
Koji Sato7942b912009-04-06 19:01:41 -07001308 case NILFS_IOCTL_CHANGE_CPMODE:
1309 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1310 case NILFS_IOCTL_DELETE_CHECKPOINT:
1311 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1312 case NILFS_IOCTL_GET_CPINFO:
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001313 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001314 sizeof(struct nilfs_cpinfo),
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001315 nilfs_ioctl_do_get_cpinfo);
Koji Sato7942b912009-04-06 19:01:41 -07001316 case NILFS_IOCTL_GET_CPSTAT:
1317 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1318 case NILFS_IOCTL_GET_SUINFO:
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001319 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001320 sizeof(struct nilfs_suinfo),
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001321 nilfs_ioctl_do_get_suinfo);
Andreas Rohner2cc88f32014-04-03 14:50:28 -07001322 case NILFS_IOCTL_SET_SUINFO:
1323 return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
Koji Sato7942b912009-04-06 19:01:41 -07001324 case NILFS_IOCTL_GET_SUSTAT:
1325 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1326 case NILFS_IOCTL_GET_VINFO:
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001327 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
Ryusuke Konishi83aca8f2009-05-11 23:24:47 +09001328 sizeof(struct nilfs_vinfo),
Ryusuke Konishi47eb6b92009-04-30 02:21:00 +09001329 nilfs_ioctl_do_get_vinfo);
Koji Sato7942b912009-04-06 19:01:41 -07001330 case NILFS_IOCTL_GET_BDESCS:
1331 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1332 case NILFS_IOCTL_CLEAN_SEGMENTS:
1333 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
Koji Sato7942b912009-04-06 19:01:41 -07001334 case NILFS_IOCTL_SYNC:
1335 return nilfs_ioctl_sync(inode, filp, cmd, argp);
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +09001336 case NILFS_IOCTL_RESIZE:
1337 return nilfs_ioctl_resize(inode, filp, argp);
Ryusuke Konishi619205d2011-05-05 01:23:57 +09001338 case NILFS_IOCTL_SET_ALLOC_RANGE:
1339 return nilfs_ioctl_set_alloc_range(inode, argp);
Andreas Rohnerf9f32c42014-04-03 14:50:30 -07001340 case FITRIM:
1341 return nilfs_ioctl_trim_fs(inode, argp);
Koji Sato7942b912009-04-06 19:01:41 -07001342 default:
1343 return -ENOTTY;
1344 }
1345}
Ryusuke Konishi828b1c52011-02-03 21:26:17 +09001346
1347#ifdef CONFIG_COMPAT
1348long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1349{
1350 switch (cmd) {
1351 case FS_IOC32_GETFLAGS:
1352 cmd = FS_IOC_GETFLAGS;
1353 break;
1354 case FS_IOC32_SETFLAGS:
1355 cmd = FS_IOC_SETFLAGS;
1356 break;
1357 case FS_IOC32_GETVERSION:
1358 cmd = FS_IOC_GETVERSION;
1359 break;
Thomas Meyer695c60f2011-12-19 17:11:55 -08001360 case NILFS_IOCTL_CHANGE_CPMODE:
1361 case NILFS_IOCTL_DELETE_CHECKPOINT:
1362 case NILFS_IOCTL_GET_CPINFO:
1363 case NILFS_IOCTL_GET_CPSTAT:
1364 case NILFS_IOCTL_GET_SUINFO:
Andreas Rohner2cc88f32014-04-03 14:50:28 -07001365 case NILFS_IOCTL_SET_SUINFO:
Thomas Meyer695c60f2011-12-19 17:11:55 -08001366 case NILFS_IOCTL_GET_SUSTAT:
1367 case NILFS_IOCTL_GET_VINFO:
1368 case NILFS_IOCTL_GET_BDESCS:
1369 case NILFS_IOCTL_CLEAN_SEGMENTS:
1370 case NILFS_IOCTL_SYNC:
1371 case NILFS_IOCTL_RESIZE:
1372 case NILFS_IOCTL_SET_ALLOC_RANGE:
1373 break;
Ryusuke Konishi828b1c52011-02-03 21:26:17 +09001374 default:
1375 return -ENOIOCTLCMD;
1376 }
1377 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1378}
1379#endif