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7942b919 KS |
1 | /* |
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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
7942b919 KS |
26 | #include <linux/capability.h> /* capable() */ |
27 | #include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */ | |
4f6b8288 | 28 | #include <linux/vmalloc.h> |
828b1c50 | 29 | #include <linux/compat.h> /* compat_ptr() */ |
2a79f17e | 30 | #include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */ |
ae191838 | 31 | #include <linux/buffer_head.h> |
7942b919 KS |
32 | #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 | ||
d623a942 VD |
40 | /** |
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 | */ | |
7942b919 KS |
60 | static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs, |
61 | struct nilfs_argv *argv, int dir, | |
62 | ssize_t (*dofunc)(struct the_nilfs *, | |
b028fcfc | 63 | __u64 *, int, |
7942b919 KS |
64 | void *, size_t, size_t)) |
65 | { | |
66 | void *buf; | |
dc498d09 | 67 | void __user *base = (void __user *)(unsigned long)argv->v_base; |
3358b4aa | 68 | size_t maxmembs, total, n; |
7942b919 KS |
69 | ssize_t nr; |
70 | int ret, i; | |
b028fcfc | 71 | __u64 pos, ppos; |
7942b919 KS |
72 | |
73 | if (argv->v_nmembs == 0) | |
74 | return 0; | |
75 | ||
3358b4aa RK |
76 | if (argv->v_size > PAGE_SIZE) |
77 | return -EINVAL; | |
78 | ||
4b15d617 WF |
79 | /* |
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 | ||
3358b4aa RK |
87 | buf = (void *)__get_free_pages(GFP_NOFS, 0); |
88 | if (unlikely(!buf)) | |
7942b919 | 89 | return -ENOMEM; |
3358b4aa | 90 | maxmembs = PAGE_SIZE / argv->v_size; |
7942b919 KS |
91 | |
92 | ret = 0; | |
93 | total = 0; | |
b028fcfc | 94 | pos = argv->v_index; |
7942b919 KS |
95 | 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) && | |
dc498d09 RK |
99 | copy_from_user(buf, base + argv->v_size * i, |
100 | argv->v_size * n)) { | |
7942b919 KS |
101 | ret = -EFAULT; |
102 | break; | |
103 | } | |
b028fcfc | 104 | ppos = pos; |
8acfbf09 | 105 | nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size, |
b028fcfc | 106 | n); |
7942b919 KS |
107 | if (nr < 0) { |
108 | ret = nr; | |
109 | break; | |
110 | } | |
111 | if ((dir & _IOC_READ) && | |
dc498d09 RK |
112 | copy_to_user(base + argv->v_size * i, buf, |
113 | argv->v_size * nr)) { | |
7942b919 KS |
114 | ret = -EFAULT; |
115 | break; | |
116 | } | |
117 | total += nr; | |
b028fcfc RK |
118 | if ((size_t)nr < n) |
119 | break; | |
120 | if (pos == ppos) | |
121 | pos += n; | |
7942b919 KS |
122 | } |
123 | argv->v_nmembs = total; | |
124 | ||
3358b4aa | 125 | free_pages((unsigned long)buf, 0); |
7942b919 KS |
126 | return ret; |
127 | } | |
128 | ||
d623a942 VD |
129 | /** |
130 | * nilfs_ioctl_getflags - ioctl to support lsattr | |
131 | */ | |
cde98f0f RK |
132 | static 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 | ||
d623a942 VD |
139 | /** |
140 | * nilfs_ioctl_setflags - ioctl to support chattr | |
141 | */ | |
cde98f0f RK |
142 | static 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 | ||
2e149670 | 149 | if (!inode_owner_or_capable(inode)) |
cde98f0f RK |
150 | return -EACCES; |
151 | ||
152 | if (get_user(flags, (int __user *)argp)) | |
153 | return -EFAULT; | |
154 | ||
a561be71 | 155 | ret = mnt_want_write_file(filp); |
cde98f0f RK |
156 | if (ret) |
157 | return ret; | |
158 | ||
159 | flags = nilfs_mask_flags(inode->i_mode, flags); | |
160 | ||
5955102c | 161 | inode_lock(inode); |
cde98f0f RK |
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); | |
188 | out: | |
5955102c | 189 | inode_unlock(inode); |
2a79f17e | 190 | mnt_drop_write_file(filp); |
cde98f0f RK |
191 | return ret; |
192 | } | |
193 | ||
d623a942 VD |
194 | /** |
195 | * nilfs_ioctl_getversion - get info about a file's version (generation number) | |
196 | */ | |
cde98f0f RK |
197 | static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp) |
198 | { | |
199 | return put_user(inode->i_generation, (int __user *)argp); | |
200 | } | |
201 | ||
d623a942 VD |
202 | /** |
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 | */ | |
7942b919 KS |
221 | static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp, |
222 | unsigned int cmd, void __user *argp) | |
223 | { | |
e3154e97 | 224 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 KS |
225 | struct nilfs_transaction_info ti; |
226 | struct nilfs_cpmode cpmode; | |
227 | int ret; | |
228 | ||
229 | if (!capable(CAP_SYS_ADMIN)) | |
230 | return -EPERM; | |
7512487e | 231 | |
a561be71 | 232 | ret = mnt_want_write_file(filp); |
7512487e RK |
233 | if (ret) |
234 | return ret; | |
235 | ||
236 | ret = -EFAULT; | |
7942b919 | 237 | if (copy_from_user(&cpmode, argp, sizeof(cpmode))) |
7512487e | 238 | goto out; |
7942b919 | 239 | |
572d8b39 | 240 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
7512487e | 241 | |
7942b919 KS |
242 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
243 | ret = nilfs_cpfile_change_cpmode( | |
e3154e97 | 244 | nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode); |
7512487e | 245 | if (unlikely(ret < 0)) |
47420c79 | 246 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
247 | else |
248 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
249 | ||
572d8b39 | 250 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
7512487e | 251 | out: |
2a79f17e | 252 | mnt_drop_write_file(filp); |
7942b919 KS |
253 | return ret; |
254 | } | |
255 | ||
d623a942 VD |
256 | /** |
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 | */ | |
7942b919 KS |
275 | static int |
276 | nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp, | |
277 | unsigned int cmd, void __user *argp) | |
278 | { | |
e3154e97 | 279 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 KS |
280 | struct nilfs_transaction_info ti; |
281 | __u64 cno; | |
282 | int ret; | |
283 | ||
284 | if (!capable(CAP_SYS_ADMIN)) | |
285 | return -EPERM; | |
7512487e | 286 | |
a561be71 | 287 | ret = mnt_want_write_file(filp); |
7512487e RK |
288 | if (ret) |
289 | return ret; | |
290 | ||
291 | ret = -EFAULT; | |
7942b919 | 292 | if (copy_from_user(&cno, argp, sizeof(cno))) |
7512487e | 293 | goto out; |
7942b919 KS |
294 | |
295 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
e3154e97 | 296 | ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno); |
7512487e | 297 | if (unlikely(ret < 0)) |
47420c79 | 298 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
299 | else |
300 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
301 | out: | |
2a79f17e | 302 | mnt_drop_write_file(filp); |
7942b919 KS |
303 | return ret; |
304 | } | |
305 | ||
d623a942 VD |
306 | /** |
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 | */ | |
7942b919 | 321 | static ssize_t |
b028fcfc | 322 | nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
323 | void *buf, size_t size, size_t nmembs) |
324 | { | |
7942b919 KS |
325 | int ret; |
326 | ||
47420c79 | 327 | down_read(&nilfs->ns_segctor_sem); |
47eb6b9c | 328 | ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, |
003ff182 | 329 | size, nmembs); |
47420c79 | 330 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
331 | return ret; |
332 | } | |
333 | ||
d623a942 VD |
334 | /** |
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 | */ | |
7942b919 KS |
355 | static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp, |
356 | unsigned int cmd, void __user *argp) | |
357 | { | |
e3154e97 | 358 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 359 | struct nilfs_cpstat cpstat; |
7942b919 KS |
360 | int ret; |
361 | ||
47420c79 RK |
362 | down_read(&nilfs->ns_segctor_sem); |
363 | ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); | |
364 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
365 | if (ret < 0) |
366 | return ret; | |
367 | ||
368 | if (copy_to_user(argp, &cpstat, sizeof(cpstat))) | |
369 | ret = -EFAULT; | |
370 | return ret; | |
371 | } | |
372 | ||
d623a942 VD |
373 | /** |
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 | */ | |
7942b919 | 388 | static ssize_t |
b028fcfc | 389 | nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
390 | void *buf, size_t size, size_t nmembs) |
391 | { | |
7942b919 KS |
392 | int ret; |
393 | ||
47420c79 | 394 | down_read(&nilfs->ns_segctor_sem); |
003ff182 RK |
395 | ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, |
396 | nmembs); | |
47420c79 | 397 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
398 | return ret; |
399 | } | |
400 | ||
d623a942 VD |
401 | /** |
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 | */ | |
7942b919 KS |
422 | static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp, |
423 | unsigned int cmd, void __user *argp) | |
424 | { | |
e3154e97 | 425 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 426 | struct nilfs_sustat sustat; |
7942b919 KS |
427 | int ret; |
428 | ||
47420c79 RK |
429 | down_read(&nilfs->ns_segctor_sem); |
430 | ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); | |
431 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
432 | if (ret < 0) |
433 | return ret; | |
434 | ||
435 | if (copy_to_user(argp, &sustat, sizeof(sustat))) | |
436 | ret = -EFAULT; | |
437 | return ret; | |
438 | } | |
439 | ||
d623a942 VD |
440 | /** |
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 | */ | |
7942b919 | 455 | static ssize_t |
b028fcfc | 456 | nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
457 | void *buf, size_t size, size_t nmembs) |
458 | { | |
7942b919 KS |
459 | int ret; |
460 | ||
47420c79 | 461 | down_read(&nilfs->ns_segctor_sem); |
365e215c | 462 | ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs); |
47420c79 | 463 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
464 | return ret; |
465 | } | |
466 | ||
d623a942 VD |
467 | /** |
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 | */ | |
7942b919 | 482 | static ssize_t |
b028fcfc | 483 | nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
484 | void *buf, size_t size, size_t nmembs) |
485 | { | |
365e215c | 486 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
7942b919 KS |
487 | struct nilfs_bdesc *bdescs = buf; |
488 | int ret, i; | |
489 | ||
47eb6b9c | 490 | down_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
491 | 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) { | |
47eb6b9c RK |
497 | if (ret != -ENOENT) { |
498 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 | 499 | return ret; |
47eb6b9c | 500 | } |
7942b919 KS |
501 | bdescs[i].bd_blocknr = 0; |
502 | } | |
503 | } | |
47eb6b9c | 504 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
505 | return nmembs; |
506 | } | |
507 | ||
d623a942 VD |
508 | /** |
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 | */ | |
7942b919 KS |
531 | static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp, |
532 | unsigned int cmd, void __user *argp) | |
533 | { | |
e3154e97 | 534 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 535 | struct nilfs_argv argv; |
7942b919 KS |
536 | int ret; |
537 | ||
538 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
539 | return -EFAULT; | |
540 | ||
83aca8f4 RK |
541 | if (argv.v_size != sizeof(struct nilfs_bdesc)) |
542 | return -EINVAL; | |
543 | ||
7942b919 KS |
544 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), |
545 | nilfs_ioctl_do_get_bdescs); | |
47420c79 RK |
546 | if (ret < 0) |
547 | return ret; | |
7942b919 KS |
548 | |
549 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
550 | ret = -EFAULT; | |
551 | return ret; | |
552 | } | |
553 | ||
d623a942 VD |
554 | /** |
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 | */ | |
7942b919 KS |
574 | static 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 | } | |
5399dd1f RK |
603 | 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 | } | |
7942b919 KS |
615 | list_add_tail(&bh->b_assoc_buffers, buffers); |
616 | return 0; | |
617 | } | |
618 | ||
d623a942 VD |
619 | /** |
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 | */ | |
263d90ce | 632 | static int nilfs_ioctl_move_blocks(struct super_block *sb, |
4f6b8288 | 633 | struct nilfs_argv *argv, void *buf) |
7942b919 | 634 | { |
4f6b8288 | 635 | size_t nmembs = argv->v_nmembs; |
e3154e97 | 636 | struct the_nilfs *nilfs = sb->s_fs_info; |
7942b919 KS |
637 | 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; | |
263d90ce | 648 | inode = nilfs_iget_for_gc(sb, ino, cno); |
103cfcf5 DC |
649 | if (IS_ERR(inode)) { |
650 | ret = PTR_ERR(inode); | |
7942b919 KS |
651 | goto failed; |
652 | } | |
947b10ae RK |
653 | 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 | ||
7942b919 KS |
664 | do { |
665 | ret = nilfs_ioctl_move_inode_block(inode, vdesc, | |
666 | &buffers); | |
263d90ce RK |
667 | if (unlikely(ret < 0)) { |
668 | iput(inode); | |
7942b919 | 669 | goto failed; |
263d90ce | 670 | } |
7942b919 KS |
671 | vdesc++; |
672 | } while (++i < nmembs && | |
673 | vdesc->vd_ino == ino && vdesc->vd_cno == cno); | |
263d90ce RK |
674 | |
675 | iput(inode); /* The inode still remains in GC inode list */ | |
7942b919 KS |
676 | } |
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)) { | |
5399dd1f | 681 | WARN_ON(ret == -EEXIST); |
7942b919 KS |
682 | goto failed; |
683 | } | |
684 | list_del_init(&bh->b_assoc_buffers); | |
7942b919 KS |
685 | 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); | |
7942b919 KS |
692 | brelse(bh); |
693 | } | |
694 | return ret; | |
695 | } | |
696 | ||
d623a942 VD |
697 | /** |
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 | */ | |
4f6b8288 RK |
716 | static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs, |
717 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 718 | { |
4f6b8288 | 719 | size_t nmembs = argv->v_nmembs; |
7942b919 KS |
720 | 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 | ||
d623a942 VD |
733 | /** |
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 | */ | |
4f6b8288 RK |
751 | static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs, |
752 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 753 | { |
4f6b8288 RK |
754 | size_t nmembs = argv->v_nmembs; |
755 | int ret; | |
7942b919 | 756 | |
365e215c | 757 | ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs); |
7942b919 KS |
758 | |
759 | return (ret < 0) ? ret : nmembs; | |
760 | } | |
761 | ||
d623a942 VD |
762 | /** |
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 | */ | |
4f6b8288 RK |
780 | static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs, |
781 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 782 | { |
4f6b8288 | 783 | size_t nmembs = argv->v_nmembs; |
365e215c | 784 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
7942b919 KS |
785 | 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) { | |
365e215c | 803 | ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat, |
7942b919 KS |
804 | bdescs[i].bd_offset); |
805 | if (ret < 0) { | |
1f5abe7e | 806 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
807 | return ret; |
808 | } | |
809 | } else { | |
810 | ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset, | |
811 | bdescs[i].bd_level); | |
812 | if (ret < 0) { | |
1f5abe7e | 813 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
814 | return ret; |
815 | } | |
816 | } | |
817 | } | |
818 | return nmembs; | |
819 | } | |
820 | ||
7942b919 | 821 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs, |
4f6b8288 | 822 | struct nilfs_argv *argv, void **kbufs) |
7942b919 | 823 | { |
1f5abe7e | 824 | const char *msg; |
4f6b8288 | 825 | int ret; |
7942b919 | 826 | |
4f6b8288 | 827 | ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]); |
1f5abe7e RK |
828 | 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 | } | |
4f6b8288 | 836 | ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]); |
1f5abe7e RK |
837 | 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 | } | |
4f6b8288 | 845 | ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]); |
1f5abe7e RK |
846 | 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 | } | |
7942b919 KS |
853 | return 0; |
854 | ||
1f5abe7e | 855 | failed: |
1f5abe7e RK |
856 | printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n", |
857 | msg, ret); | |
7942b919 KS |
858 | return ret; |
859 | } | |
860 | ||
d623a942 VD |
861 | /** |
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 | */ | |
7942b919 KS |
875 | static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, |
876 | unsigned int cmd, void __user *argp) | |
877 | { | |
4f6b8288 | 878 | struct nilfs_argv argv[5]; |
33e189bd | 879 | static const size_t argsz[5] = { |
4f6b8288 RK |
880 | 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 | ||
7942b919 KS |
892 | if (!capable(CAP_SYS_ADMIN)) |
893 | return -EPERM; | |
4f6b8288 | 894 | |
a561be71 | 895 | ret = mnt_want_write_file(filp); |
7512487e RK |
896 | if (ret) |
897 | return ret; | |
898 | ||
899 | ret = -EFAULT; | |
4f6b8288 | 900 | if (copy_from_user(argv, argp, sizeof(argv))) |
7512487e | 901 | goto out; |
4f6b8288 | 902 | |
7512487e | 903 | ret = -EINVAL; |
4f6b8288 RK |
904 | nsegs = argv[4].v_nmembs; |
905 | if (argv[4].v_size != argsz[4]) | |
7512487e | 906 | goto out; |
1ecd3c7e XW |
907 | if (nsegs > UINT_MAX / sizeof(__u64)) |
908 | goto out; | |
7512487e | 909 | |
4f6b8288 RK |
910 | /* |
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)); | |
7512487e RK |
917 | if (IS_ERR(kbufs[4])) { |
918 | ret = PTR_ERR(kbufs[4]); | |
919 | goto out; | |
920 | } | |
e3154e97 | 921 | nilfs = inode->i_sb->s_fs_info; |
4f6b8288 RK |
922 | |
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 | ||
481fe17e HC |
931 | if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size) |
932 | goto out_free; | |
933 | ||
4f6b8288 RK |
934 | 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 | ||
1cf58fa8 | 953 | /* |
263d90ce | 954 | * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(), |
1cf58fa8 JS |
955 | * 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 | ||
263d90ce | 964 | ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]); |
1cf58fa8 JS |
965 | if (ret < 0) |
966 | printk(KERN_ERR "NILFS: GC failed during preparation: " | |
967 | "cannot read source blocks: err=%d\n", ret); | |
a9bae189 VD |
968 | else { |
969 | if (nilfs_sb_need_update(nilfs)) | |
970 | set_nilfs_discontinued(nilfs); | |
1cf58fa8 | 971 | ret = nilfs_clean_segments(inode->i_sb, argv, kbufs); |
a9bae189 | 972 | } |
1cf58fa8 | 973 | |
263d90ce | 974 | nilfs_remove_all_gcinodes(nilfs); |
1cf58fa8 | 975 | clear_nilfs_gc_running(nilfs); |
4f6b8288 | 976 | |
7512487e | 977 | out_free: |
d5046853 | 978 | while (--n >= 0) |
4f6b8288 RK |
979 | vfree(kbufs[n]); |
980 | kfree(kbufs[4]); | |
7512487e | 981 | out: |
2a79f17e | 982 | mnt_drop_write_file(filp); |
4f6b8288 | 983 | return ret; |
7942b919 KS |
984 | } |
985 | ||
d623a942 VD |
986 | /** |
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 | */ | |
7942b919 KS |
1013 | static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, |
1014 | unsigned int cmd, void __user *argp) | |
1015 | { | |
1016 | __u64 cno; | |
1017 | int ret; | |
0d561f12 | 1018 | struct the_nilfs *nilfs; |
7942b919 KS |
1019 | |
1020 | ret = nilfs_construct_segment(inode->i_sb); | |
1021 | if (ret < 0) | |
1022 | return ret; | |
1023 | ||
11475975 | 1024 | nilfs = inode->i_sb->s_fs_info; |
e2c7617a AR |
1025 | ret = nilfs_flush_device(nilfs); |
1026 | if (ret < 0) | |
1027 | return ret; | |
11475975 | 1028 | |
7942b919 | 1029 | if (argp != NULL) { |
0d561f12 JS |
1030 | down_read(&nilfs->ns_segctor_sem); |
1031 | cno = nilfs->ns_cno - 1; | |
1032 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
1033 | if (copy_to_user(argp, &cno, sizeof(cno))) |
1034 | return -EFAULT; | |
1035 | } | |
1036 | return 0; | |
1037 | } | |
1038 | ||
d623a942 VD |
1039 | /** |
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 | */ | |
4e33f9ea RK |
1047 | static 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 | ||
a561be71 | 1056 | ret = mnt_want_write_file(filp); |
4e33f9ea RK |
1057 | 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 | ||
1066 | out_drop_write: | |
2a79f17e | 1067 | mnt_drop_write_file(filp); |
4e33f9ea RK |
1068 | out: |
1069 | return ret; | |
1070 | } | |
1071 | ||
f9f32c44 AR |
1072 | /** |
1073 | * 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 | */ | |
1083 | static 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 | ||
d623a942 VD |
1114 | /** |
1115 | * 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 | */ | |
619205da RK |
1125 | static 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); | |
1153 | out: | |
1154 | return ret; | |
1155 | } | |
1156 | ||
d623a942 VD |
1157 | /** |
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 | */ | |
47eb6b9c RK |
1179 | static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, |
1180 | unsigned int cmd, void __user *argp, | |
83aca8f4 | 1181 | size_t membsz, |
47eb6b9c RK |
1182 | ssize_t (*dofunc)(struct the_nilfs *, |
1183 | __u64 *, int, | |
1184 | void *, size_t, size_t)) | |
1185 | ||
1186 | { | |
e3154e97 | 1187 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
47eb6b9c RK |
1188 | struct nilfs_argv argv; |
1189 | int ret; | |
1190 | ||
1191 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1192 | return -EFAULT; | |
1193 | ||
003ff182 | 1194 | if (argv.v_size < membsz) |
83aca8f4 RK |
1195 | return -EINVAL; |
1196 | ||
47eb6b9c RK |
1197 | 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 | ||
2cc88f3a AR |
1206 | /** |
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 | */ | |
1230 | static 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 | ||
1288 | out_free: | |
1289 | vfree(kbuf); | |
1290 | out: | |
1291 | mnt_drop_write_file(filp); | |
1292 | return ret; | |
1293 | } | |
1294 | ||
7a946193 | 1295 | long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
7942b919 | 1296 | { |
496ad9aa | 1297 | struct inode *inode = file_inode(filp); |
75323400 | 1298 | void __user *argp = (void __user *)arg; |
7942b919 KS |
1299 | |
1300 | switch (cmd) { | |
cde98f0f RK |
1301 | 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); | |
7942b919 KS |
1307 | 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: | |
47eb6b9c | 1312 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1313 | sizeof(struct nilfs_cpinfo), |
47eb6b9c | 1314 | nilfs_ioctl_do_get_cpinfo); |
7942b919 KS |
1315 | case NILFS_IOCTL_GET_CPSTAT: |
1316 | return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); | |
1317 | case NILFS_IOCTL_GET_SUINFO: | |
47eb6b9c | 1318 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1319 | sizeof(struct nilfs_suinfo), |
47eb6b9c | 1320 | nilfs_ioctl_do_get_suinfo); |
2cc88f3a AR |
1321 | case NILFS_IOCTL_SET_SUINFO: |
1322 | return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp); | |
7942b919 KS |
1323 | case NILFS_IOCTL_GET_SUSTAT: |
1324 | return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); | |
1325 | case NILFS_IOCTL_GET_VINFO: | |
47eb6b9c | 1326 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1327 | sizeof(struct nilfs_vinfo), |
47eb6b9c | 1328 | nilfs_ioctl_do_get_vinfo); |
7942b919 KS |
1329 | 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); | |
7942b919 KS |
1333 | case NILFS_IOCTL_SYNC: |
1334 | return nilfs_ioctl_sync(inode, filp, cmd, argp); | |
4e33f9ea RK |
1335 | case NILFS_IOCTL_RESIZE: |
1336 | return nilfs_ioctl_resize(inode, filp, argp); | |
619205da RK |
1337 | case NILFS_IOCTL_SET_ALLOC_RANGE: |
1338 | return nilfs_ioctl_set_alloc_range(inode, argp); | |
f9f32c44 AR |
1339 | case FITRIM: |
1340 | return nilfs_ioctl_trim_fs(inode, argp); | |
7942b919 KS |
1341 | default: |
1342 | return -ENOTTY; | |
1343 | } | |
1344 | } | |
828b1c50 RK |
1345 | |
1346 | #ifdef CONFIG_COMPAT | |
1347 | long 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; | |
695c60f2 TM |
1359 | 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: | |
2cc88f3a | 1364 | case NILFS_IOCTL_SET_SUINFO: |
695c60f2 TM |
1365 | 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; | |
828b1c50 RK |
1373 | default: |
1374 | return -ENOIOCTLCMD; | |
1375 | } | |
1376 | return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1377 | } | |
1378 | #endif |