Commit | Line | Data |
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ae98043f | 1 | // SPDX-License-Identifier: GPL-2.0+ |
7942b919 KS |
2 | /* |
3 | * ioctl.c - NILFS ioctl operations. | |
4 | * | |
5 | * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
4b420ab4 | 7 | * Written by Koji Sato. |
7942b919 KS |
8 | */ |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/wait.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
7942b919 KS |
13 | #include <linux/capability.h> /* capable() */ |
14 | #include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */ | |
4f6b8288 | 15 | #include <linux/vmalloc.h> |
828b1c50 | 16 | #include <linux/compat.h> /* compat_ptr() */ |
2a79f17e | 17 | #include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */ |
ae191838 | 18 | #include <linux/buffer_head.h> |
7942b919 KS |
19 | #include "nilfs.h" |
20 | #include "segment.h" | |
21 | #include "bmap.h" | |
22 | #include "cpfile.h" | |
23 | #include "sufile.h" | |
24 | #include "dat.h" | |
25 | ||
d623a942 VD |
26 | /** |
27 | * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info | |
28 | * @nilfs: nilfs object | |
29 | * @argv: vector of arguments from userspace | |
30 | * @dir: set of direction flags | |
31 | * @dofunc: concrete function of get/set metadata info | |
32 | * | |
33 | * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of | |
34 | * calling dofunc() function on the basis of @argv argument. | |
35 | * | |
36 | * Return Value: On success, 0 is returned and requested metadata info | |
37 | * is copied into userspace. On error, one of the following | |
38 | * negative error codes is returned. | |
39 | * | |
40 | * %-EINVAL - Invalid arguments from userspace. | |
41 | * | |
42 | * %-ENOMEM - Insufficient amount of memory available. | |
43 | * | |
44 | * %-EFAULT - Failure during execution of requested operation. | |
45 | */ | |
7942b919 KS |
46 | static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs, |
47 | struct nilfs_argv *argv, int dir, | |
48 | ssize_t (*dofunc)(struct the_nilfs *, | |
b028fcfc | 49 | __u64 *, int, |
7942b919 KS |
50 | void *, size_t, size_t)) |
51 | { | |
52 | void *buf; | |
dc498d09 | 53 | void __user *base = (void __user *)(unsigned long)argv->v_base; |
3358b4aa | 54 | size_t maxmembs, total, n; |
7942b919 KS |
55 | ssize_t nr; |
56 | int ret, i; | |
b028fcfc | 57 | __u64 pos, ppos; |
7942b919 KS |
58 | |
59 | if (argv->v_nmembs == 0) | |
60 | return 0; | |
61 | ||
3358b4aa RK |
62 | if (argv->v_size > PAGE_SIZE) |
63 | return -EINVAL; | |
64 | ||
4b15d617 WF |
65 | /* |
66 | * Reject pairs of a start item position (argv->v_index) and a | |
67 | * total count (argv->v_nmembs) which leads position 'pos' to | |
68 | * overflow by the increment at the end of the loop. | |
69 | */ | |
70 | if (argv->v_index > ~(__u64)0 - argv->v_nmembs) | |
71 | return -EINVAL; | |
72 | ||
3358b4aa RK |
73 | buf = (void *)__get_free_pages(GFP_NOFS, 0); |
74 | if (unlikely(!buf)) | |
7942b919 | 75 | return -ENOMEM; |
3358b4aa | 76 | maxmembs = PAGE_SIZE / argv->v_size; |
7942b919 KS |
77 | |
78 | ret = 0; | |
79 | total = 0; | |
b028fcfc | 80 | pos = argv->v_index; |
7942b919 KS |
81 | for (i = 0; i < argv->v_nmembs; i += n) { |
82 | n = (argv->v_nmembs - i < maxmembs) ? | |
83 | argv->v_nmembs - i : maxmembs; | |
84 | if ((dir & _IOC_WRITE) && | |
dc498d09 RK |
85 | copy_from_user(buf, base + argv->v_size * i, |
86 | argv->v_size * n)) { | |
7942b919 KS |
87 | ret = -EFAULT; |
88 | break; | |
89 | } | |
b028fcfc | 90 | ppos = pos; |
8acfbf09 | 91 | nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size, |
b028fcfc | 92 | n); |
7942b919 KS |
93 | if (nr < 0) { |
94 | ret = nr; | |
95 | break; | |
96 | } | |
97 | if ((dir & _IOC_READ) && | |
dc498d09 RK |
98 | copy_to_user(base + argv->v_size * i, buf, |
99 | argv->v_size * nr)) { | |
7942b919 KS |
100 | ret = -EFAULT; |
101 | break; | |
102 | } | |
103 | total += nr; | |
b028fcfc RK |
104 | if ((size_t)nr < n) |
105 | break; | |
106 | if (pos == ppos) | |
107 | pos += n; | |
7942b919 KS |
108 | } |
109 | argv->v_nmembs = total; | |
110 | ||
3358b4aa | 111 | free_pages((unsigned long)buf, 0); |
7942b919 KS |
112 | return ret; |
113 | } | |
114 | ||
d623a942 VD |
115 | /** |
116 | * nilfs_ioctl_getflags - ioctl to support lsattr | |
117 | */ | |
cde98f0f RK |
118 | static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp) |
119 | { | |
120 | unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE; | |
121 | ||
122 | return put_user(flags, (int __user *)argp); | |
123 | } | |
124 | ||
d623a942 VD |
125 | /** |
126 | * nilfs_ioctl_setflags - ioctl to support chattr | |
127 | */ | |
cde98f0f RK |
128 | static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp, |
129 | void __user *argp) | |
130 | { | |
131 | struct nilfs_transaction_info ti; | |
132 | unsigned int flags, oldflags; | |
133 | int ret; | |
134 | ||
2e149670 | 135 | if (!inode_owner_or_capable(inode)) |
cde98f0f RK |
136 | return -EACCES; |
137 | ||
138 | if (get_user(flags, (int __user *)argp)) | |
139 | return -EFAULT; | |
140 | ||
a561be71 | 141 | ret = mnt_want_write_file(filp); |
cde98f0f RK |
142 | if (ret) |
143 | return ret; | |
144 | ||
145 | flags = nilfs_mask_flags(inode->i_mode, flags); | |
146 | ||
5955102c | 147 | inode_lock(inode); |
cde98f0f RK |
148 | |
149 | oldflags = NILFS_I(inode)->i_flags; | |
150 | ||
151 | /* | |
152 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by the | |
153 | * relevant capability. | |
154 | */ | |
155 | ret = -EPERM; | |
156 | if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) && | |
157 | !capable(CAP_LINUX_IMMUTABLE)) | |
158 | goto out; | |
159 | ||
160 | ret = nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
161 | if (ret) | |
162 | goto out; | |
163 | ||
164 | NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) | | |
165 | (flags & FS_FL_USER_MODIFIABLE); | |
166 | ||
167 | nilfs_set_inode_flags(inode); | |
078cd827 | 168 | inode->i_ctime = current_time(inode); |
cde98f0f RK |
169 | if (IS_SYNC(inode)) |
170 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
171 | ||
172 | nilfs_mark_inode_dirty(inode); | |
173 | ret = nilfs_transaction_commit(inode->i_sb); | |
174 | out: | |
5955102c | 175 | inode_unlock(inode); |
2a79f17e | 176 | mnt_drop_write_file(filp); |
cde98f0f RK |
177 | return ret; |
178 | } | |
179 | ||
d623a942 VD |
180 | /** |
181 | * nilfs_ioctl_getversion - get info about a file's version (generation number) | |
182 | */ | |
cde98f0f RK |
183 | static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp) |
184 | { | |
185 | return put_user(inode->i_generation, (int __user *)argp); | |
186 | } | |
187 | ||
d623a942 VD |
188 | /** |
189 | * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot) | |
190 | * @inode: inode object | |
191 | * @filp: file object | |
192 | * @cmd: ioctl's request code | |
193 | * @argp: pointer on argument from userspace | |
194 | * | |
195 | * Description: nilfs_ioctl_change_cpmode() function changes mode of | |
196 | * given checkpoint between checkpoint and snapshot state. This ioctl | |
197 | * is used in chcp and mkcp utilities. | |
198 | * | |
199 | * Return Value: On success, 0 is returned and mode of a checkpoint is | |
200 | * changed. On error, one of the following negative error codes | |
201 | * is returned. | |
202 | * | |
203 | * %-EPERM - Operation not permitted. | |
204 | * | |
205 | * %-EFAULT - Failure during checkpoint mode changing. | |
206 | */ | |
7942b919 KS |
207 | static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp, |
208 | unsigned int cmd, void __user *argp) | |
209 | { | |
e3154e97 | 210 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 KS |
211 | struct nilfs_transaction_info ti; |
212 | struct nilfs_cpmode cpmode; | |
213 | int ret; | |
214 | ||
215 | if (!capable(CAP_SYS_ADMIN)) | |
216 | return -EPERM; | |
7512487e | 217 | |
a561be71 | 218 | ret = mnt_want_write_file(filp); |
7512487e RK |
219 | if (ret) |
220 | return ret; | |
221 | ||
222 | ret = -EFAULT; | |
7942b919 | 223 | if (copy_from_user(&cpmode, argp, sizeof(cpmode))) |
7512487e | 224 | goto out; |
7942b919 | 225 | |
572d8b39 | 226 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
7512487e | 227 | |
7942b919 KS |
228 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
229 | ret = nilfs_cpfile_change_cpmode( | |
e3154e97 | 230 | nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode); |
7512487e | 231 | if (unlikely(ret < 0)) |
47420c79 | 232 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
233 | else |
234 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
235 | ||
572d8b39 | 236 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
7512487e | 237 | out: |
2a79f17e | 238 | mnt_drop_write_file(filp); |
7942b919 KS |
239 | return ret; |
240 | } | |
241 | ||
d623a942 VD |
242 | /** |
243 | * nilfs_ioctl_delete_checkpoint - remove checkpoint | |
244 | * @inode: inode object | |
245 | * @filp: file object | |
246 | * @cmd: ioctl's request code | |
247 | * @argp: pointer on argument from userspace | |
248 | * | |
249 | * Description: nilfs_ioctl_delete_checkpoint() function removes | |
250 | * checkpoint from NILFS2 file system. This ioctl is used in rmcp | |
251 | * utility. | |
252 | * | |
253 | * Return Value: On success, 0 is returned and a checkpoint is | |
254 | * removed. On error, one of the following negative error codes | |
255 | * is returned. | |
256 | * | |
257 | * %-EPERM - Operation not permitted. | |
258 | * | |
259 | * %-EFAULT - Failure during checkpoint removing. | |
260 | */ | |
7942b919 KS |
261 | static int |
262 | nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp, | |
263 | unsigned int cmd, void __user *argp) | |
264 | { | |
e3154e97 | 265 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 KS |
266 | struct nilfs_transaction_info ti; |
267 | __u64 cno; | |
268 | int ret; | |
269 | ||
270 | if (!capable(CAP_SYS_ADMIN)) | |
271 | return -EPERM; | |
7512487e | 272 | |
a561be71 | 273 | ret = mnt_want_write_file(filp); |
7512487e RK |
274 | if (ret) |
275 | return ret; | |
276 | ||
277 | ret = -EFAULT; | |
7942b919 | 278 | if (copy_from_user(&cno, argp, sizeof(cno))) |
7512487e | 279 | goto out; |
7942b919 KS |
280 | |
281 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
e3154e97 | 282 | ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno); |
7512487e | 283 | if (unlikely(ret < 0)) |
47420c79 | 284 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
285 | else |
286 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
287 | out: | |
2a79f17e | 288 | mnt_drop_write_file(filp); |
7942b919 KS |
289 | return ret; |
290 | } | |
291 | ||
d623a942 VD |
292 | /** |
293 | * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints | |
294 | * @nilfs: nilfs object | |
295 | * @posp: pointer on array of checkpoint's numbers | |
296 | * @flags: checkpoint mode (checkpoint or snapshot) | |
297 | * @buf: buffer for storing checkponts' info | |
298 | * @size: size in bytes of one checkpoint info item in array | |
299 | * @nmembs: number of checkpoints in array (numbers and infos) | |
300 | * | |
301 | * Description: nilfs_ioctl_do_get_cpinfo() function returns info about | |
302 | * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in | |
303 | * lscp utility and by nilfs_cleanerd daemon. | |
304 | * | |
305 | * Return value: count of nilfs_cpinfo structures in output buffer. | |
306 | */ | |
7942b919 | 307 | static ssize_t |
b028fcfc | 308 | nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
309 | void *buf, size_t size, size_t nmembs) |
310 | { | |
7942b919 KS |
311 | int ret; |
312 | ||
47420c79 | 313 | down_read(&nilfs->ns_segctor_sem); |
47eb6b9c | 314 | ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, |
003ff182 | 315 | size, nmembs); |
47420c79 | 316 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
317 | return ret; |
318 | } | |
319 | ||
d623a942 VD |
320 | /** |
321 | * nilfs_ioctl_get_cpstat - get checkpoints statistics | |
322 | * @inode: inode object | |
323 | * @filp: file object | |
324 | * @cmd: ioctl's request code | |
325 | * @argp: pointer on argument from userspace | |
326 | * | |
327 | * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints. | |
328 | * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities | |
329 | * and by nilfs_cleanerd daemon. | |
330 | * | |
331 | * Return Value: On success, 0 is returned, and checkpoints information is | |
332 | * copied into userspace pointer @argp. On error, one of the following | |
333 | * negative error codes is returned. | |
334 | * | |
335 | * %-EIO - I/O error. | |
336 | * | |
337 | * %-ENOMEM - Insufficient amount of memory available. | |
338 | * | |
339 | * %-EFAULT - Failure during getting checkpoints statistics. | |
340 | */ | |
7942b919 KS |
341 | static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp, |
342 | unsigned int cmd, void __user *argp) | |
343 | { | |
e3154e97 | 344 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 345 | struct nilfs_cpstat cpstat; |
7942b919 KS |
346 | int ret; |
347 | ||
47420c79 RK |
348 | down_read(&nilfs->ns_segctor_sem); |
349 | ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); | |
350 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
351 | if (ret < 0) |
352 | return ret; | |
353 | ||
354 | if (copy_to_user(argp, &cpstat, sizeof(cpstat))) | |
355 | ret = -EFAULT; | |
356 | return ret; | |
357 | } | |
358 | ||
d623a942 VD |
359 | /** |
360 | * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info | |
361 | * @nilfs: nilfs object | |
362 | * @posp: pointer on array of segment numbers | |
363 | * @flags: *not used* | |
364 | * @buf: buffer for storing suinfo array | |
365 | * @size: size in bytes of one suinfo item in array | |
366 | * @nmembs: count of segment numbers and suinfos in array | |
367 | * | |
368 | * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage | |
369 | * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used | |
370 | * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon. | |
371 | * | |
372 | * Return value: count of nilfs_suinfo structures in output buffer. | |
373 | */ | |
7942b919 | 374 | static ssize_t |
b028fcfc | 375 | nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
376 | void *buf, size_t size, size_t nmembs) |
377 | { | |
7942b919 KS |
378 | int ret; |
379 | ||
47420c79 | 380 | down_read(&nilfs->ns_segctor_sem); |
003ff182 RK |
381 | ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, |
382 | nmembs); | |
47420c79 | 383 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
384 | return ret; |
385 | } | |
386 | ||
d623a942 VD |
387 | /** |
388 | * nilfs_ioctl_get_sustat - get segment usage statistics | |
389 | * @inode: inode object | |
390 | * @filp: file object | |
391 | * @cmd: ioctl's request code | |
392 | * @argp: pointer on argument from userspace | |
393 | * | |
394 | * Description: nilfs_ioctl_get_sustat() returns segment usage statistics. | |
395 | * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities | |
396 | * and by nilfs_cleanerd daemon. | |
397 | * | |
398 | * Return Value: On success, 0 is returned, and segment usage information is | |
399 | * copied into userspace pointer @argp. On error, one of the following | |
400 | * negative error codes is returned. | |
401 | * | |
402 | * %-EIO - I/O error. | |
403 | * | |
404 | * %-ENOMEM - Insufficient amount of memory available. | |
405 | * | |
406 | * %-EFAULT - Failure during getting segment usage statistics. | |
407 | */ | |
7942b919 KS |
408 | static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp, |
409 | unsigned int cmd, void __user *argp) | |
410 | { | |
e3154e97 | 411 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 412 | struct nilfs_sustat sustat; |
7942b919 KS |
413 | int ret; |
414 | ||
47420c79 RK |
415 | down_read(&nilfs->ns_segctor_sem); |
416 | ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); | |
417 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
418 | if (ret < 0) |
419 | return ret; | |
420 | ||
421 | if (copy_to_user(argp, &sustat, sizeof(sustat))) | |
422 | ret = -EFAULT; | |
423 | return ret; | |
424 | } | |
425 | ||
d623a942 VD |
426 | /** |
427 | * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info | |
428 | * @nilfs: nilfs object | |
429 | * @posp: *not used* | |
430 | * @flags: *not used* | |
431 | * @buf: buffer for storing array of nilfs_vinfo structures | |
432 | * @size: size in bytes of one vinfo item in array | |
433 | * @nmembs: count of vinfos in array | |
434 | * | |
435 | * Description: nilfs_ioctl_do_get_vinfo() function returns information | |
436 | * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used | |
437 | * by nilfs_cleanerd daemon. | |
438 | * | |
439 | * Return value: count of nilfs_vinfo structures in output buffer. | |
440 | */ | |
7942b919 | 441 | static ssize_t |
b028fcfc | 442 | nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
443 | void *buf, size_t size, size_t nmembs) |
444 | { | |
7942b919 KS |
445 | int ret; |
446 | ||
47420c79 | 447 | down_read(&nilfs->ns_segctor_sem); |
365e215c | 448 | ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs); |
47420c79 | 449 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
450 | return ret; |
451 | } | |
452 | ||
d623a942 VD |
453 | /** |
454 | * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors | |
455 | * @nilfs: nilfs object | |
456 | * @posp: *not used* | |
457 | * @flags: *not used* | |
458 | * @buf: buffer for storing array of nilfs_bdesc structures | |
459 | * @size: size in bytes of one bdesc item in array | |
460 | * @nmembs: count of bdescs in array | |
461 | * | |
462 | * Description: nilfs_ioctl_do_get_bdescs() function returns information | |
463 | * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl | |
464 | * is used by nilfs_cleanerd daemon. | |
465 | * | |
466 | * Return value: count of nilfs_bdescs structures in output buffer. | |
467 | */ | |
7942b919 | 468 | static ssize_t |
b028fcfc | 469 | nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
470 | void *buf, size_t size, size_t nmembs) |
471 | { | |
365e215c | 472 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
7942b919 KS |
473 | struct nilfs_bdesc *bdescs = buf; |
474 | int ret, i; | |
475 | ||
47eb6b9c | 476 | down_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
477 | for (i = 0; i < nmembs; i++) { |
478 | ret = nilfs_bmap_lookup_at_level(bmap, | |
479 | bdescs[i].bd_offset, | |
480 | bdescs[i].bd_level + 1, | |
481 | &bdescs[i].bd_blocknr); | |
482 | if (ret < 0) { | |
47eb6b9c RK |
483 | if (ret != -ENOENT) { |
484 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 | 485 | return ret; |
47eb6b9c | 486 | } |
7942b919 KS |
487 | bdescs[i].bd_blocknr = 0; |
488 | } | |
489 | } | |
47eb6b9c | 490 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
491 | return nmembs; |
492 | } | |
493 | ||
d623a942 VD |
494 | /** |
495 | * nilfs_ioctl_get_bdescs - get disk block descriptors | |
496 | * @inode: inode object | |
497 | * @filp: file object | |
498 | * @cmd: ioctl's request code | |
499 | * @argp: pointer on argument from userspace | |
500 | * | |
501 | * Description: nilfs_ioctl_do_get_bdescs() function returns information | |
502 | * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl | |
503 | * is used by nilfs_cleanerd daemon. | |
504 | * | |
505 | * Return Value: On success, 0 is returned, and disk block descriptors are | |
506 | * copied into userspace pointer @argp. On error, one of the following | |
507 | * negative error codes is returned. | |
508 | * | |
509 | * %-EINVAL - Invalid arguments from userspace. | |
510 | * | |
511 | * %-EIO - I/O error. | |
512 | * | |
513 | * %-ENOMEM - Insufficient amount of memory available. | |
514 | * | |
515 | * %-EFAULT - Failure during getting disk block descriptors. | |
516 | */ | |
7942b919 KS |
517 | static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp, |
518 | unsigned int cmd, void __user *argp) | |
519 | { | |
e3154e97 | 520 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 521 | struct nilfs_argv argv; |
7942b919 KS |
522 | int ret; |
523 | ||
524 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
525 | return -EFAULT; | |
526 | ||
83aca8f4 RK |
527 | if (argv.v_size != sizeof(struct nilfs_bdesc)) |
528 | return -EINVAL; | |
529 | ||
7942b919 KS |
530 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), |
531 | nilfs_ioctl_do_get_bdescs); | |
47420c79 RK |
532 | if (ret < 0) |
533 | return ret; | |
7942b919 KS |
534 | |
535 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
536 | ret = -EFAULT; | |
537 | return ret; | |
538 | } | |
539 | ||
d623a942 VD |
540 | /** |
541 | * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC | |
542 | * @inode: inode object | |
543 | * @vdesc: descriptor of virtual block number | |
544 | * @buffers: list of moving buffers | |
545 | * | |
546 | * Description: nilfs_ioctl_move_inode_block() function registers data/node | |
547 | * buffer in the GC pagecache and submit read request. | |
548 | * | |
549 | * Return Value: On success, 0 is returned. On error, one of the following | |
550 | * negative error codes is returned. | |
551 | * | |
552 | * %-EIO - I/O error. | |
553 | * | |
554 | * %-ENOMEM - Insufficient amount of memory available. | |
555 | * | |
556 | * %-ENOENT - Requested block doesn't exist. | |
557 | * | |
558 | * %-EEXIST - Blocks conflict is detected. | |
559 | */ | |
7942b919 KS |
560 | static int nilfs_ioctl_move_inode_block(struct inode *inode, |
561 | struct nilfs_vdesc *vdesc, | |
562 | struct list_head *buffers) | |
563 | { | |
564 | struct buffer_head *bh; | |
565 | int ret; | |
566 | ||
567 | if (vdesc->vd_flags == 0) | |
568 | ret = nilfs_gccache_submit_read_data( | |
569 | inode, vdesc->vd_offset, vdesc->vd_blocknr, | |
570 | vdesc->vd_vblocknr, &bh); | |
571 | else | |
572 | ret = nilfs_gccache_submit_read_node( | |
573 | inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh); | |
574 | ||
575 | if (unlikely(ret < 0)) { | |
576 | if (ret == -ENOENT) | |
feee880f RK |
577 | nilfs_msg(inode->i_sb, KERN_CRIT, |
578 | "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu", | |
579 | __func__, vdesc->vd_flags ? "node" : "data", | |
580 | (unsigned long long)vdesc->vd_ino, | |
581 | (unsigned long long)vdesc->vd_cno, | |
582 | (unsigned long long)vdesc->vd_offset, | |
583 | (unsigned long long)vdesc->vd_blocknr, | |
584 | (unsigned long long)vdesc->vd_vblocknr); | |
7942b919 KS |
585 | return ret; |
586 | } | |
5399dd1f | 587 | if (unlikely(!list_empty(&bh->b_assoc_buffers))) { |
feee880f RK |
588 | nilfs_msg(inode->i_sb, KERN_CRIT, |
589 | "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu", | |
590 | __func__, vdesc->vd_flags ? "node" : "data", | |
591 | (unsigned long long)vdesc->vd_ino, | |
592 | (unsigned long long)vdesc->vd_cno, | |
593 | (unsigned long long)vdesc->vd_offset, | |
594 | (unsigned long long)vdesc->vd_blocknr, | |
595 | (unsigned long long)vdesc->vd_vblocknr); | |
5399dd1f RK |
596 | brelse(bh); |
597 | return -EEXIST; | |
598 | } | |
7942b919 KS |
599 | list_add_tail(&bh->b_assoc_buffers, buffers); |
600 | return 0; | |
601 | } | |
602 | ||
d623a942 VD |
603 | /** |
604 | * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection | |
605 | * @sb: superblock object | |
606 | * @argv: vector of arguments from userspace | |
607 | * @buf: array of nilfs_vdesc structures | |
608 | * | |
609 | * Description: nilfs_ioctl_move_blocks() function reads valid data/node | |
610 | * blocks that garbage collector specified with the array of nilfs_vdesc | |
611 | * structures and stores them into page caches of GC inodes. | |
612 | * | |
613 | * Return Value: Number of processed nilfs_vdesc structures or | |
614 | * error code, otherwise. | |
615 | */ | |
263d90ce | 616 | static int nilfs_ioctl_move_blocks(struct super_block *sb, |
4f6b8288 | 617 | struct nilfs_argv *argv, void *buf) |
7942b919 | 618 | { |
4f6b8288 | 619 | size_t nmembs = argv->v_nmembs; |
e3154e97 | 620 | struct the_nilfs *nilfs = sb->s_fs_info; |
7942b919 KS |
621 | struct inode *inode; |
622 | struct nilfs_vdesc *vdesc; | |
623 | struct buffer_head *bh, *n; | |
624 | LIST_HEAD(buffers); | |
625 | ino_t ino; | |
626 | __u64 cno; | |
627 | int i, ret; | |
628 | ||
629 | for (i = 0, vdesc = buf; i < nmembs; ) { | |
630 | ino = vdesc->vd_ino; | |
631 | cno = vdesc->vd_cno; | |
263d90ce | 632 | inode = nilfs_iget_for_gc(sb, ino, cno); |
103cfcf5 DC |
633 | if (IS_ERR(inode)) { |
634 | ret = PTR_ERR(inode); | |
7942b919 KS |
635 | goto failed; |
636 | } | |
947b10ae RK |
637 | if (list_empty(&NILFS_I(inode)->i_dirty)) { |
638 | /* | |
639 | * Add the inode to GC inode list. Garbage Collection | |
640 | * is serialized and no two processes manipulate the | |
641 | * list simultaneously. | |
642 | */ | |
643 | igrab(inode); | |
644 | list_add(&NILFS_I(inode)->i_dirty, | |
645 | &nilfs->ns_gc_inodes); | |
646 | } | |
647 | ||
7942b919 KS |
648 | do { |
649 | ret = nilfs_ioctl_move_inode_block(inode, vdesc, | |
650 | &buffers); | |
263d90ce RK |
651 | if (unlikely(ret < 0)) { |
652 | iput(inode); | |
7942b919 | 653 | goto failed; |
263d90ce | 654 | } |
7942b919 KS |
655 | vdesc++; |
656 | } while (++i < nmembs && | |
657 | vdesc->vd_ino == ino && vdesc->vd_cno == cno); | |
263d90ce RK |
658 | |
659 | iput(inode); /* The inode still remains in GC inode list */ | |
7942b919 KS |
660 | } |
661 | ||
662 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { | |
663 | ret = nilfs_gccache_wait_and_mark_dirty(bh); | |
664 | if (unlikely(ret < 0)) { | |
5399dd1f | 665 | WARN_ON(ret == -EEXIST); |
7942b919 KS |
666 | goto failed; |
667 | } | |
668 | list_del_init(&bh->b_assoc_buffers); | |
7942b919 KS |
669 | brelse(bh); |
670 | } | |
671 | return nmembs; | |
672 | ||
673 | failed: | |
674 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { | |
675 | list_del_init(&bh->b_assoc_buffers); | |
7942b919 KS |
676 | brelse(bh); |
677 | } | |
678 | return ret; | |
679 | } | |
680 | ||
d623a942 VD |
681 | /** |
682 | * nilfs_ioctl_delete_checkpoints - delete checkpoints | |
683 | * @nilfs: nilfs object | |
684 | * @argv: vector of arguments from userspace | |
685 | * @buf: array of periods of checkpoints numbers | |
686 | * | |
687 | * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints | |
688 | * in the period from p_start to p_end, excluding p_end itself. The checkpoints | |
689 | * which have been already deleted are ignored. | |
690 | * | |
691 | * Return Value: Number of processed nilfs_period structures or | |
692 | * error code, otherwise. | |
693 | * | |
694 | * %-EIO - I/O error. | |
695 | * | |
696 | * %-ENOMEM - Insufficient amount of memory available. | |
697 | * | |
698 | * %-EINVAL - invalid checkpoints. | |
699 | */ | |
4f6b8288 RK |
700 | static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs, |
701 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 702 | { |
4f6b8288 | 703 | size_t nmembs = argv->v_nmembs; |
7942b919 KS |
704 | struct inode *cpfile = nilfs->ns_cpfile; |
705 | struct nilfs_period *periods = buf; | |
706 | int ret, i; | |
707 | ||
708 | for (i = 0; i < nmembs; i++) { | |
709 | ret = nilfs_cpfile_delete_checkpoints( | |
710 | cpfile, periods[i].p_start, periods[i].p_end); | |
711 | if (ret < 0) | |
712 | return ret; | |
713 | } | |
714 | return nmembs; | |
715 | } | |
716 | ||
d623a942 VD |
717 | /** |
718 | * nilfs_ioctl_free_vblocknrs - free virtual block numbers | |
719 | * @nilfs: nilfs object | |
720 | * @argv: vector of arguments from userspace | |
721 | * @buf: array of virtual block numbers | |
722 | * | |
723 | * Description: nilfs_ioctl_free_vblocknrs() function frees | |
724 | * the virtual block numbers specified by @buf and @argv->v_nmembs. | |
725 | * | |
726 | * Return Value: Number of processed virtual block numbers or | |
727 | * error code, otherwise. | |
728 | * | |
729 | * %-EIO - I/O error. | |
730 | * | |
731 | * %-ENOMEM - Insufficient amount of memory available. | |
732 | * | |
733 | * %-ENOENT - The virtual block number have not been allocated. | |
734 | */ | |
4f6b8288 RK |
735 | static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs, |
736 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 737 | { |
4f6b8288 RK |
738 | size_t nmembs = argv->v_nmembs; |
739 | int ret; | |
7942b919 | 740 | |
365e215c | 741 | ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs); |
7942b919 KS |
742 | |
743 | return (ret < 0) ? ret : nmembs; | |
744 | } | |
745 | ||
d623a942 VD |
746 | /** |
747 | * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty | |
748 | * @nilfs: nilfs object | |
749 | * @argv: vector of arguments from userspace | |
750 | * @buf: array of block descriptors | |
751 | * | |
752 | * Description: nilfs_ioctl_mark_blocks_dirty() function marks | |
753 | * metadata file or data blocks as dirty. | |
754 | * | |
755 | * Return Value: Number of processed block descriptors or | |
756 | * error code, otherwise. | |
757 | * | |
758 | * %-ENOMEM - Insufficient memory available. | |
759 | * | |
760 | * %-EIO - I/O error | |
761 | * | |
762 | * %-ENOENT - the specified block does not exist (hole block) | |
763 | */ | |
4f6b8288 RK |
764 | static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs, |
765 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 766 | { |
4f6b8288 | 767 | size_t nmembs = argv->v_nmembs; |
365e215c | 768 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
7942b919 | 769 | struct nilfs_bdesc *bdescs = buf; |
24e20ead | 770 | struct buffer_head *bh; |
7942b919 KS |
771 | int ret, i; |
772 | ||
773 | for (i = 0; i < nmembs; i++) { | |
774 | /* XXX: use macro or inline func to check liveness */ | |
775 | ret = nilfs_bmap_lookup_at_level(bmap, | |
776 | bdescs[i].bd_offset, | |
777 | bdescs[i].bd_level + 1, | |
778 | &bdescs[i].bd_blocknr); | |
779 | if (ret < 0) { | |
780 | if (ret != -ENOENT) | |
781 | return ret; | |
782 | bdescs[i].bd_blocknr = 0; | |
783 | } | |
784 | if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr) | |
785 | /* skip dead block */ | |
786 | continue; | |
787 | if (bdescs[i].bd_level == 0) { | |
24e20ead RK |
788 | ret = nilfs_mdt_get_block(nilfs->ns_dat, |
789 | bdescs[i].bd_offset, | |
790 | false, NULL, &bh); | |
791 | if (unlikely(ret)) { | |
1f5abe7e | 792 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
793 | return ret; |
794 | } | |
24e20ead RK |
795 | mark_buffer_dirty(bh); |
796 | nilfs_mdt_mark_dirty(nilfs->ns_dat); | |
797 | put_bh(bh); | |
7942b919 KS |
798 | } else { |
799 | ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset, | |
800 | bdescs[i].bd_level); | |
801 | if (ret < 0) { | |
1f5abe7e | 802 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
803 | return ret; |
804 | } | |
805 | } | |
806 | } | |
807 | return nmembs; | |
808 | } | |
809 | ||
7942b919 | 810 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs, |
4f6b8288 | 811 | struct nilfs_argv *argv, void **kbufs) |
7942b919 | 812 | { |
1f5abe7e | 813 | const char *msg; |
4f6b8288 | 814 | int ret; |
7942b919 | 815 | |
4f6b8288 | 816 | ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]); |
1f5abe7e RK |
817 | if (ret < 0) { |
818 | /* | |
819 | * can safely abort because checkpoints can be removed | |
820 | * independently. | |
821 | */ | |
822 | msg = "cannot delete checkpoints"; | |
823 | goto failed; | |
824 | } | |
4f6b8288 | 825 | ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]); |
1f5abe7e RK |
826 | if (ret < 0) { |
827 | /* | |
828 | * can safely abort because DAT file is updated atomically | |
829 | * using a copy-on-write technique. | |
830 | */ | |
831 | msg = "cannot delete virtual blocks from DAT file"; | |
832 | goto failed; | |
833 | } | |
4f6b8288 | 834 | ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]); |
1f5abe7e RK |
835 | if (ret < 0) { |
836 | /* | |
837 | * can safely abort because the operation is nondestructive. | |
838 | */ | |
839 | msg = "cannot mark copying blocks dirty"; | |
840 | goto failed; | |
841 | } | |
7942b919 KS |
842 | return 0; |
843 | ||
1f5abe7e | 844 | failed: |
feee880f RK |
845 | nilfs_msg(nilfs->ns_sb, KERN_ERR, "error %d preparing GC: %s", ret, |
846 | msg); | |
7942b919 KS |
847 | return ret; |
848 | } | |
849 | ||
d623a942 VD |
850 | /** |
851 | * nilfs_ioctl_clean_segments - clean segments | |
852 | * @inode: inode object | |
853 | * @filp: file object | |
854 | * @cmd: ioctl's request code | |
855 | * @argp: pointer on argument from userspace | |
856 | * | |
857 | * Description: nilfs_ioctl_clean_segments() function makes garbage | |
858 | * collection operation in the environment of requested parameters | |
859 | * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by | |
860 | * nilfs_cleanerd daemon. | |
861 | * | |
862 | * Return Value: On success, 0 is returned or error code, otherwise. | |
863 | */ | |
7942b919 KS |
864 | static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, |
865 | unsigned int cmd, void __user *argp) | |
866 | { | |
4f6b8288 | 867 | struct nilfs_argv argv[5]; |
33e189bd | 868 | static const size_t argsz[5] = { |
4f6b8288 RK |
869 | sizeof(struct nilfs_vdesc), |
870 | sizeof(struct nilfs_period), | |
871 | sizeof(__u64), | |
872 | sizeof(struct nilfs_bdesc), | |
873 | sizeof(__u64), | |
874 | }; | |
875 | void __user *base; | |
876 | void *kbufs[5]; | |
877 | struct the_nilfs *nilfs; | |
878 | size_t len, nsegs; | |
879 | int n, ret; | |
880 | ||
7942b919 KS |
881 | if (!capable(CAP_SYS_ADMIN)) |
882 | return -EPERM; | |
4f6b8288 | 883 | |
a561be71 | 884 | ret = mnt_want_write_file(filp); |
7512487e RK |
885 | if (ret) |
886 | return ret; | |
887 | ||
888 | ret = -EFAULT; | |
4f6b8288 | 889 | if (copy_from_user(argv, argp, sizeof(argv))) |
7512487e | 890 | goto out; |
4f6b8288 | 891 | |
7512487e | 892 | ret = -EINVAL; |
4f6b8288 RK |
893 | nsegs = argv[4].v_nmembs; |
894 | if (argv[4].v_size != argsz[4]) | |
7512487e | 895 | goto out; |
1ecd3c7e XW |
896 | if (nsegs > UINT_MAX / sizeof(__u64)) |
897 | goto out; | |
7512487e | 898 | |
4f6b8288 RK |
899 | /* |
900 | * argv[4] points to segment numbers this ioctl cleans. We | |
901 | * use kmalloc() for its buffer because memory used for the | |
902 | * segment numbers is enough small. | |
903 | */ | |
904 | kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base, | |
905 | nsegs * sizeof(__u64)); | |
7512487e RK |
906 | if (IS_ERR(kbufs[4])) { |
907 | ret = PTR_ERR(kbufs[4]); | |
908 | goto out; | |
909 | } | |
e3154e97 | 910 | nilfs = inode->i_sb->s_fs_info; |
4f6b8288 RK |
911 | |
912 | for (n = 0; n < 4; n++) { | |
913 | ret = -EINVAL; | |
914 | if (argv[n].v_size != argsz[n]) | |
915 | goto out_free; | |
916 | ||
917 | if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment) | |
918 | goto out_free; | |
919 | ||
481fe17e HC |
920 | if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size) |
921 | goto out_free; | |
922 | ||
4f6b8288 RK |
923 | len = argv[n].v_size * argv[n].v_nmembs; |
924 | base = (void __user *)(unsigned long)argv[n].v_base; | |
925 | if (len == 0) { | |
926 | kbufs[n] = NULL; | |
927 | continue; | |
928 | } | |
929 | ||
930 | kbufs[n] = vmalloc(len); | |
931 | if (!kbufs[n]) { | |
932 | ret = -ENOMEM; | |
933 | goto out_free; | |
934 | } | |
935 | if (copy_from_user(kbufs[n], base, len)) { | |
936 | ret = -EFAULT; | |
937 | vfree(kbufs[n]); | |
938 | goto out_free; | |
939 | } | |
940 | } | |
941 | ||
1cf58fa8 | 942 | /* |
263d90ce | 943 | * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(), |
1cf58fa8 JS |
944 | * which will operates an inode list without blocking. |
945 | * To protect the list from concurrent operations, | |
946 | * nilfs_ioctl_move_blocks should be atomic operation. | |
947 | */ | |
948 | if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) { | |
949 | ret = -EBUSY; | |
950 | goto out_free; | |
951 | } | |
952 | ||
263d90ce | 953 | ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]); |
feee880f RK |
954 | if (ret < 0) { |
955 | nilfs_msg(inode->i_sb, KERN_ERR, | |
956 | "error %d preparing GC: cannot read source blocks", | |
957 | ret); | |
958 | } else { | |
a9bae189 VD |
959 | if (nilfs_sb_need_update(nilfs)) |
960 | set_nilfs_discontinued(nilfs); | |
1cf58fa8 | 961 | ret = nilfs_clean_segments(inode->i_sb, argv, kbufs); |
a9bae189 | 962 | } |
1cf58fa8 | 963 | |
263d90ce | 964 | nilfs_remove_all_gcinodes(nilfs); |
1cf58fa8 | 965 | clear_nilfs_gc_running(nilfs); |
4f6b8288 | 966 | |
7512487e | 967 | out_free: |
d5046853 | 968 | while (--n >= 0) |
4f6b8288 RK |
969 | vfree(kbufs[n]); |
970 | kfree(kbufs[4]); | |
7512487e | 971 | out: |
2a79f17e | 972 | mnt_drop_write_file(filp); |
4f6b8288 | 973 | return ret; |
7942b919 KS |
974 | } |
975 | ||
d623a942 VD |
976 | /** |
977 | * nilfs_ioctl_sync - make a checkpoint | |
978 | * @inode: inode object | |
979 | * @filp: file object | |
980 | * @cmd: ioctl's request code | |
981 | * @argp: pointer on argument from userspace | |
982 | * | |
983 | * Description: nilfs_ioctl_sync() function constructs a logical segment | |
984 | * for checkpointing. This function guarantees that all modified data | |
985 | * and metadata are written out to the device when it successfully | |
986 | * returned. | |
987 | * | |
988 | * Return Value: On success, 0 is retured. On errors, one of the following | |
989 | * negative error code is returned. | |
990 | * | |
991 | * %-EROFS - Read only filesystem. | |
992 | * | |
993 | * %-EIO - I/O error | |
994 | * | |
995 | * %-ENOSPC - No space left on device (only in a panic state). | |
996 | * | |
997 | * %-ERESTARTSYS - Interrupted. | |
998 | * | |
999 | * %-ENOMEM - Insufficient memory available. | |
1000 | * | |
1001 | * %-EFAULT - Failure during execution of requested operation. | |
1002 | */ | |
7942b919 KS |
1003 | static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, |
1004 | unsigned int cmd, void __user *argp) | |
1005 | { | |
1006 | __u64 cno; | |
1007 | int ret; | |
0d561f12 | 1008 | struct the_nilfs *nilfs; |
7942b919 KS |
1009 | |
1010 | ret = nilfs_construct_segment(inode->i_sb); | |
1011 | if (ret < 0) | |
1012 | return ret; | |
1013 | ||
11475975 | 1014 | nilfs = inode->i_sb->s_fs_info; |
e2c7617a AR |
1015 | ret = nilfs_flush_device(nilfs); |
1016 | if (ret < 0) | |
1017 | return ret; | |
11475975 | 1018 | |
7942b919 | 1019 | if (argp != NULL) { |
0d561f12 JS |
1020 | down_read(&nilfs->ns_segctor_sem); |
1021 | cno = nilfs->ns_cno - 1; | |
1022 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
1023 | if (copy_to_user(argp, &cno, sizeof(cno))) |
1024 | return -EFAULT; | |
1025 | } | |
1026 | return 0; | |
1027 | } | |
1028 | ||
d623a942 VD |
1029 | /** |
1030 | * nilfs_ioctl_resize - resize NILFS2 volume | |
1031 | * @inode: inode object | |
1032 | * @filp: file object | |
1033 | * @argp: pointer on argument from userspace | |
1034 | * | |
1035 | * Return Value: On success, 0 is returned or error code, otherwise. | |
1036 | */ | |
4e33f9ea RK |
1037 | static int nilfs_ioctl_resize(struct inode *inode, struct file *filp, |
1038 | void __user *argp) | |
1039 | { | |
1040 | __u64 newsize; | |
1041 | int ret = -EPERM; | |
1042 | ||
1043 | if (!capable(CAP_SYS_ADMIN)) | |
1044 | goto out; | |
1045 | ||
a561be71 | 1046 | ret = mnt_want_write_file(filp); |
4e33f9ea RK |
1047 | if (ret) |
1048 | goto out; | |
1049 | ||
1050 | ret = -EFAULT; | |
1051 | if (copy_from_user(&newsize, argp, sizeof(newsize))) | |
1052 | goto out_drop_write; | |
1053 | ||
1054 | ret = nilfs_resize_fs(inode->i_sb, newsize); | |
1055 | ||
1056 | out_drop_write: | |
2a79f17e | 1057 | mnt_drop_write_file(filp); |
4e33f9ea RK |
1058 | out: |
1059 | return ret; | |
1060 | } | |
1061 | ||
f9f32c44 AR |
1062 | /** |
1063 | * nilfs_ioctl_trim_fs() - trim ioctl handle function | |
1064 | * @inode: inode object | |
1065 | * @argp: pointer on argument from userspace | |
1066 | * | |
1067 | * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It | |
1068 | * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which | |
1069 | * performs the actual trim operation. | |
1070 | * | |
1071 | * Return Value: On success, 0 is returned or negative error code, otherwise. | |
1072 | */ | |
1073 | static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp) | |
1074 | { | |
1075 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1076 | struct request_queue *q = bdev_get_queue(nilfs->ns_bdev); | |
1077 | struct fstrim_range range; | |
1078 | int ret; | |
1079 | ||
1080 | if (!capable(CAP_SYS_ADMIN)) | |
1081 | return -EPERM; | |
1082 | ||
1083 | if (!blk_queue_discard(q)) | |
1084 | return -EOPNOTSUPP; | |
1085 | ||
1086 | if (copy_from_user(&range, argp, sizeof(range))) | |
1087 | return -EFAULT; | |
1088 | ||
1089 | range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity); | |
1090 | ||
1091 | down_read(&nilfs->ns_segctor_sem); | |
1092 | ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range); | |
1093 | up_read(&nilfs->ns_segctor_sem); | |
1094 | ||
1095 | if (ret < 0) | |
1096 | return ret; | |
1097 | ||
1098 | if (copy_to_user(argp, &range, sizeof(range))) | |
1099 | return -EFAULT; | |
1100 | ||
1101 | return 0; | |
1102 | } | |
1103 | ||
d623a942 VD |
1104 | /** |
1105 | * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated | |
1106 | * @inode: inode object | |
1107 | * @argp: pointer on argument from userspace | |
1108 | * | |
1109 | * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit | |
1110 | * of segments in bytes and upper limit of segments in bytes. | |
1111 | * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility. | |
1112 | * | |
1113 | * Return Value: On success, 0 is returned or error code, otherwise. | |
1114 | */ | |
619205da RK |
1115 | static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp) |
1116 | { | |
1117 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1118 | __u64 range[2]; | |
1119 | __u64 minseg, maxseg; | |
1120 | unsigned long segbytes; | |
1121 | int ret = -EPERM; | |
1122 | ||
1123 | if (!capable(CAP_SYS_ADMIN)) | |
1124 | goto out; | |
1125 | ||
1126 | ret = -EFAULT; | |
1127 | if (copy_from_user(range, argp, sizeof(__u64[2]))) | |
1128 | goto out; | |
1129 | ||
1130 | ret = -ERANGE; | |
1131 | if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode)) | |
1132 | goto out; | |
1133 | ||
1134 | segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize; | |
1135 | ||
1136 | minseg = range[0] + segbytes - 1; | |
1137 | do_div(minseg, segbytes); | |
1138 | maxseg = NILFS_SB2_OFFSET_BYTES(range[1]); | |
1139 | do_div(maxseg, segbytes); | |
1140 | maxseg--; | |
1141 | ||
1142 | ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg); | |
1143 | out: | |
1144 | return ret; | |
1145 | } | |
1146 | ||
d623a942 VD |
1147 | /** |
1148 | * nilfs_ioctl_get_info - wrapping function of get metadata info | |
1149 | * @inode: inode object | |
1150 | * @filp: file object | |
1151 | * @cmd: ioctl's request code | |
1152 | * @argp: pointer on argument from userspace | |
1153 | * @membsz: size of an item in bytes | |
1154 | * @dofunc: concrete function of getting metadata info | |
1155 | * | |
1156 | * Description: nilfs_ioctl_get_info() gets metadata info by means of | |
1157 | * calling dofunc() function. | |
1158 | * | |
1159 | * Return Value: On success, 0 is returned and requested metadata info | |
1160 | * is copied into userspace. On error, one of the following | |
1161 | * negative error codes is returned. | |
1162 | * | |
1163 | * %-EINVAL - Invalid arguments from userspace. | |
1164 | * | |
1165 | * %-ENOMEM - Insufficient amount of memory available. | |
1166 | * | |
1167 | * %-EFAULT - Failure during execution of requested operation. | |
1168 | */ | |
47eb6b9c RK |
1169 | static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, |
1170 | unsigned int cmd, void __user *argp, | |
83aca8f4 | 1171 | size_t membsz, |
47eb6b9c RK |
1172 | ssize_t (*dofunc)(struct the_nilfs *, |
1173 | __u64 *, int, | |
1174 | void *, size_t, size_t)) | |
1175 | ||
1176 | { | |
e3154e97 | 1177 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
47eb6b9c RK |
1178 | struct nilfs_argv argv; |
1179 | int ret; | |
1180 | ||
1181 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1182 | return -EFAULT; | |
1183 | ||
003ff182 | 1184 | if (argv.v_size < membsz) |
83aca8f4 RK |
1185 | return -EINVAL; |
1186 | ||
47eb6b9c RK |
1187 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc); |
1188 | if (ret < 0) | |
1189 | return ret; | |
1190 | ||
1191 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
1192 | ret = -EFAULT; | |
1193 | return ret; | |
1194 | } | |
1195 | ||
2cc88f3a AR |
1196 | /** |
1197 | * nilfs_ioctl_set_suinfo - set segment usage info | |
1198 | * @inode: inode object | |
1199 | * @filp: file object | |
1200 | * @cmd: ioctl's request code | |
1201 | * @argp: pointer on argument from userspace | |
1202 | * | |
1203 | * Description: Expects an array of nilfs_suinfo_update structures | |
1204 | * encapsulated in nilfs_argv and updates the segment usage info | |
1205 | * according to the flags in nilfs_suinfo_update. | |
1206 | * | |
1207 | * Return Value: On success, 0 is returned. On error, one of the | |
1208 | * following negative error codes is returned. | |
1209 | * | |
1210 | * %-EPERM - Not enough permissions | |
1211 | * | |
1212 | * %-EFAULT - Error copying input data | |
1213 | * | |
1214 | * %-EIO - I/O error. | |
1215 | * | |
1216 | * %-ENOMEM - Insufficient amount of memory available. | |
1217 | * | |
1218 | * %-EINVAL - Invalid values in input (segment number, flags or nblocks) | |
1219 | */ | |
1220 | static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp, | |
1221 | unsigned int cmd, void __user *argp) | |
1222 | { | |
1223 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1224 | struct nilfs_transaction_info ti; | |
1225 | struct nilfs_argv argv; | |
1226 | size_t len; | |
1227 | void __user *base; | |
1228 | void *kbuf; | |
1229 | int ret; | |
1230 | ||
1231 | if (!capable(CAP_SYS_ADMIN)) | |
1232 | return -EPERM; | |
1233 | ||
1234 | ret = mnt_want_write_file(filp); | |
1235 | if (ret) | |
1236 | return ret; | |
1237 | ||
1238 | ret = -EFAULT; | |
1239 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1240 | goto out; | |
1241 | ||
1242 | ret = -EINVAL; | |
1243 | if (argv.v_size < sizeof(struct nilfs_suinfo_update)) | |
1244 | goto out; | |
1245 | ||
1246 | if (argv.v_nmembs > nilfs->ns_nsegments) | |
1247 | goto out; | |
1248 | ||
1249 | if (argv.v_nmembs >= UINT_MAX / argv.v_size) | |
1250 | goto out; | |
1251 | ||
1252 | len = argv.v_size * argv.v_nmembs; | |
1253 | if (!len) { | |
1254 | ret = 0; | |
1255 | goto out; | |
1256 | } | |
1257 | ||
1258 | base = (void __user *)(unsigned long)argv.v_base; | |
1259 | kbuf = vmalloc(len); | |
1260 | if (!kbuf) { | |
1261 | ret = -ENOMEM; | |
1262 | goto out; | |
1263 | } | |
1264 | ||
1265 | if (copy_from_user(kbuf, base, len)) { | |
1266 | ret = -EFAULT; | |
1267 | goto out_free; | |
1268 | } | |
1269 | ||
1270 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
1271 | ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size, | |
1272 | argv.v_nmembs); | |
1273 | if (unlikely(ret < 0)) | |
1274 | nilfs_transaction_abort(inode->i_sb); | |
1275 | else | |
1276 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
1277 | ||
1278 | out_free: | |
1279 | vfree(kbuf); | |
1280 | out: | |
1281 | mnt_drop_write_file(filp); | |
1282 | return ret; | |
1283 | } | |
1284 | ||
7a946193 | 1285 | long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
7942b919 | 1286 | { |
496ad9aa | 1287 | struct inode *inode = file_inode(filp); |
75323400 | 1288 | void __user *argp = (void __user *)arg; |
7942b919 KS |
1289 | |
1290 | switch (cmd) { | |
cde98f0f RK |
1291 | case FS_IOC_GETFLAGS: |
1292 | return nilfs_ioctl_getflags(inode, argp); | |
1293 | case FS_IOC_SETFLAGS: | |
1294 | return nilfs_ioctl_setflags(inode, filp, argp); | |
1295 | case FS_IOC_GETVERSION: | |
1296 | return nilfs_ioctl_getversion(inode, argp); | |
7942b919 KS |
1297 | case NILFS_IOCTL_CHANGE_CPMODE: |
1298 | return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp); | |
1299 | case NILFS_IOCTL_DELETE_CHECKPOINT: | |
1300 | return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp); | |
1301 | case NILFS_IOCTL_GET_CPINFO: | |
47eb6b9c | 1302 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1303 | sizeof(struct nilfs_cpinfo), |
47eb6b9c | 1304 | nilfs_ioctl_do_get_cpinfo); |
7942b919 KS |
1305 | case NILFS_IOCTL_GET_CPSTAT: |
1306 | return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); | |
1307 | case NILFS_IOCTL_GET_SUINFO: | |
47eb6b9c | 1308 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1309 | sizeof(struct nilfs_suinfo), |
47eb6b9c | 1310 | nilfs_ioctl_do_get_suinfo); |
2cc88f3a AR |
1311 | case NILFS_IOCTL_SET_SUINFO: |
1312 | return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp); | |
7942b919 KS |
1313 | case NILFS_IOCTL_GET_SUSTAT: |
1314 | return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); | |
1315 | case NILFS_IOCTL_GET_VINFO: | |
47eb6b9c | 1316 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1317 | sizeof(struct nilfs_vinfo), |
47eb6b9c | 1318 | nilfs_ioctl_do_get_vinfo); |
7942b919 KS |
1319 | case NILFS_IOCTL_GET_BDESCS: |
1320 | return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp); | |
1321 | case NILFS_IOCTL_CLEAN_SEGMENTS: | |
1322 | return nilfs_ioctl_clean_segments(inode, filp, cmd, argp); | |
7942b919 KS |
1323 | case NILFS_IOCTL_SYNC: |
1324 | return nilfs_ioctl_sync(inode, filp, cmd, argp); | |
4e33f9ea RK |
1325 | case NILFS_IOCTL_RESIZE: |
1326 | return nilfs_ioctl_resize(inode, filp, argp); | |
619205da RK |
1327 | case NILFS_IOCTL_SET_ALLOC_RANGE: |
1328 | return nilfs_ioctl_set_alloc_range(inode, argp); | |
f9f32c44 AR |
1329 | case FITRIM: |
1330 | return nilfs_ioctl_trim_fs(inode, argp); | |
7942b919 KS |
1331 | default: |
1332 | return -ENOTTY; | |
1333 | } | |
1334 | } | |
828b1c50 RK |
1335 | |
1336 | #ifdef CONFIG_COMPAT | |
1337 | long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1338 | { | |
1339 | switch (cmd) { | |
1340 | case FS_IOC32_GETFLAGS: | |
1341 | cmd = FS_IOC_GETFLAGS; | |
1342 | break; | |
1343 | case FS_IOC32_SETFLAGS: | |
1344 | cmd = FS_IOC_SETFLAGS; | |
1345 | break; | |
1346 | case FS_IOC32_GETVERSION: | |
1347 | cmd = FS_IOC_GETVERSION; | |
1348 | break; | |
695c60f2 TM |
1349 | case NILFS_IOCTL_CHANGE_CPMODE: |
1350 | case NILFS_IOCTL_DELETE_CHECKPOINT: | |
1351 | case NILFS_IOCTL_GET_CPINFO: | |
1352 | case NILFS_IOCTL_GET_CPSTAT: | |
1353 | case NILFS_IOCTL_GET_SUINFO: | |
2cc88f3a | 1354 | case NILFS_IOCTL_SET_SUINFO: |
695c60f2 TM |
1355 | case NILFS_IOCTL_GET_SUSTAT: |
1356 | case NILFS_IOCTL_GET_VINFO: | |
1357 | case NILFS_IOCTL_GET_BDESCS: | |
1358 | case NILFS_IOCTL_CLEAN_SEGMENTS: | |
1359 | case NILFS_IOCTL_SYNC: | |
1360 | case NILFS_IOCTL_RESIZE: | |
1361 | case NILFS_IOCTL_SET_ALLOC_RANGE: | |
1362 | break; | |
828b1c50 RK |
1363 | default: |
1364 | return -ENOIOCTLCMD; | |
1365 | } | |
1366 | return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1367 | } | |
1368 | #endif |