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Commit | Line | Data |
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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 | * | |
4b420ab4 | 16 | * Written by Koji Sato. |
7942b919 KS |
17 | */ |
18 | ||
19 | #include <linux/fs.h> | |
20 | #include <linux/wait.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
7942b919 KS |
22 | #include <linux/capability.h> /* capable() */ |
23 | #include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */ | |
4f6b8288 | 24 | #include <linux/vmalloc.h> |
828b1c50 | 25 | #include <linux/compat.h> /* compat_ptr() */ |
2a79f17e | 26 | #include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */ |
ae191838 | 27 | #include <linux/buffer_head.h> |
7942b919 KS |
28 | #include "nilfs.h" |
29 | #include "segment.h" | |
30 | #include "bmap.h" | |
31 | #include "cpfile.h" | |
32 | #include "sufile.h" | |
33 | #include "dat.h" | |
34 | ||
d623a942 VD |
35 | /** |
36 | * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info | |
37 | * @nilfs: nilfs object | |
38 | * @argv: vector of arguments from userspace | |
39 | * @dir: set of direction flags | |
40 | * @dofunc: concrete function of get/set metadata info | |
41 | * | |
42 | * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of | |
43 | * calling dofunc() function on the basis of @argv argument. | |
44 | * | |
45 | * Return Value: On success, 0 is returned and requested metadata info | |
46 | * is copied into userspace. On error, one of the following | |
47 | * negative error codes is returned. | |
48 | * | |
49 | * %-EINVAL - Invalid arguments from userspace. | |
50 | * | |
51 | * %-ENOMEM - Insufficient amount of memory available. | |
52 | * | |
53 | * %-EFAULT - Failure during execution of requested operation. | |
54 | */ | |
7942b919 KS |
55 | static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs, |
56 | struct nilfs_argv *argv, int dir, | |
57 | ssize_t (*dofunc)(struct the_nilfs *, | |
b028fcfc | 58 | __u64 *, int, |
7942b919 KS |
59 | void *, size_t, size_t)) |
60 | { | |
61 | void *buf; | |
dc498d09 | 62 | void __user *base = (void __user *)(unsigned long)argv->v_base; |
3358b4aa | 63 | size_t maxmembs, total, n; |
7942b919 KS |
64 | ssize_t nr; |
65 | int ret, i; | |
b028fcfc | 66 | __u64 pos, ppos; |
7942b919 KS |
67 | |
68 | if (argv->v_nmembs == 0) | |
69 | return 0; | |
70 | ||
3358b4aa RK |
71 | if (argv->v_size > PAGE_SIZE) |
72 | return -EINVAL; | |
73 | ||
4b15d617 WF |
74 | /* |
75 | * Reject pairs of a start item position (argv->v_index) and a | |
76 | * total count (argv->v_nmembs) which leads position 'pos' to | |
77 | * overflow by the increment at the end of the loop. | |
78 | */ | |
79 | if (argv->v_index > ~(__u64)0 - argv->v_nmembs) | |
80 | return -EINVAL; | |
81 | ||
3358b4aa RK |
82 | buf = (void *)__get_free_pages(GFP_NOFS, 0); |
83 | if (unlikely(!buf)) | |
7942b919 | 84 | return -ENOMEM; |
3358b4aa | 85 | maxmembs = PAGE_SIZE / argv->v_size; |
7942b919 KS |
86 | |
87 | ret = 0; | |
88 | total = 0; | |
b028fcfc | 89 | pos = argv->v_index; |
7942b919 KS |
90 | for (i = 0; i < argv->v_nmembs; i += n) { |
91 | n = (argv->v_nmembs - i < maxmembs) ? | |
92 | argv->v_nmembs - i : maxmembs; | |
93 | if ((dir & _IOC_WRITE) && | |
dc498d09 RK |
94 | copy_from_user(buf, base + argv->v_size * i, |
95 | argv->v_size * n)) { | |
7942b919 KS |
96 | ret = -EFAULT; |
97 | break; | |
98 | } | |
b028fcfc | 99 | ppos = pos; |
8acfbf09 | 100 | nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size, |
b028fcfc | 101 | n); |
7942b919 KS |
102 | if (nr < 0) { |
103 | ret = nr; | |
104 | break; | |
105 | } | |
106 | if ((dir & _IOC_READ) && | |
dc498d09 RK |
107 | copy_to_user(base + argv->v_size * i, buf, |
108 | argv->v_size * nr)) { | |
7942b919 KS |
109 | ret = -EFAULT; |
110 | break; | |
111 | } | |
112 | total += nr; | |
b028fcfc RK |
113 | if ((size_t)nr < n) |
114 | break; | |
115 | if (pos == ppos) | |
116 | pos += n; | |
7942b919 KS |
117 | } |
118 | argv->v_nmembs = total; | |
119 | ||
3358b4aa | 120 | free_pages((unsigned long)buf, 0); |
7942b919 KS |
121 | return ret; |
122 | } | |
123 | ||
d623a942 VD |
124 | /** |
125 | * nilfs_ioctl_getflags - ioctl to support lsattr | |
126 | */ | |
cde98f0f RK |
127 | static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp) |
128 | { | |
129 | unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE; | |
130 | ||
131 | return put_user(flags, (int __user *)argp); | |
132 | } | |
133 | ||
d623a942 VD |
134 | /** |
135 | * nilfs_ioctl_setflags - ioctl to support chattr | |
136 | */ | |
cde98f0f RK |
137 | static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp, |
138 | void __user *argp) | |
139 | { | |
140 | struct nilfs_transaction_info ti; | |
141 | unsigned int flags, oldflags; | |
142 | int ret; | |
143 | ||
2e149670 | 144 | if (!inode_owner_or_capable(inode)) |
cde98f0f RK |
145 | return -EACCES; |
146 | ||
147 | if (get_user(flags, (int __user *)argp)) | |
148 | return -EFAULT; | |
149 | ||
a561be71 | 150 | ret = mnt_want_write_file(filp); |
cde98f0f RK |
151 | if (ret) |
152 | return ret; | |
153 | ||
154 | flags = nilfs_mask_flags(inode->i_mode, flags); | |
155 | ||
5955102c | 156 | inode_lock(inode); |
cde98f0f RK |
157 | |
158 | oldflags = NILFS_I(inode)->i_flags; | |
159 | ||
160 | /* | |
161 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by the | |
162 | * relevant capability. | |
163 | */ | |
164 | ret = -EPERM; | |
165 | if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) && | |
166 | !capable(CAP_LINUX_IMMUTABLE)) | |
167 | goto out; | |
168 | ||
169 | ret = nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
170 | if (ret) | |
171 | goto out; | |
172 | ||
173 | NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) | | |
174 | (flags & FS_FL_USER_MODIFIABLE); | |
175 | ||
176 | nilfs_set_inode_flags(inode); | |
078cd827 | 177 | inode->i_ctime = current_time(inode); |
cde98f0f RK |
178 | if (IS_SYNC(inode)) |
179 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
180 | ||
181 | nilfs_mark_inode_dirty(inode); | |
182 | ret = nilfs_transaction_commit(inode->i_sb); | |
183 | out: | |
5955102c | 184 | inode_unlock(inode); |
2a79f17e | 185 | mnt_drop_write_file(filp); |
cde98f0f RK |
186 | return ret; |
187 | } | |
188 | ||
d623a942 VD |
189 | /** |
190 | * nilfs_ioctl_getversion - get info about a file's version (generation number) | |
191 | */ | |
cde98f0f RK |
192 | static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp) |
193 | { | |
194 | return put_user(inode->i_generation, (int __user *)argp); | |
195 | } | |
196 | ||
d623a942 VD |
197 | /** |
198 | * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot) | |
199 | * @inode: inode object | |
200 | * @filp: file object | |
201 | * @cmd: ioctl's request code | |
202 | * @argp: pointer on argument from userspace | |
203 | * | |
204 | * Description: nilfs_ioctl_change_cpmode() function changes mode of | |
205 | * given checkpoint between checkpoint and snapshot state. This ioctl | |
206 | * is used in chcp and mkcp utilities. | |
207 | * | |
208 | * Return Value: On success, 0 is returned and mode of a checkpoint is | |
209 | * changed. On error, one of the following negative error codes | |
210 | * is returned. | |
211 | * | |
212 | * %-EPERM - Operation not permitted. | |
213 | * | |
214 | * %-EFAULT - Failure during checkpoint mode changing. | |
215 | */ | |
7942b919 KS |
216 | static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp, |
217 | unsigned int cmd, void __user *argp) | |
218 | { | |
e3154e97 | 219 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 KS |
220 | struct nilfs_transaction_info ti; |
221 | struct nilfs_cpmode cpmode; | |
222 | int ret; | |
223 | ||
224 | if (!capable(CAP_SYS_ADMIN)) | |
225 | return -EPERM; | |
7512487e | 226 | |
a561be71 | 227 | ret = mnt_want_write_file(filp); |
7512487e RK |
228 | if (ret) |
229 | return ret; | |
230 | ||
231 | ret = -EFAULT; | |
7942b919 | 232 | if (copy_from_user(&cpmode, argp, sizeof(cpmode))) |
7512487e | 233 | goto out; |
7942b919 | 234 | |
572d8b39 | 235 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
7512487e | 236 | |
7942b919 KS |
237 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
238 | ret = nilfs_cpfile_change_cpmode( | |
e3154e97 | 239 | nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode); |
7512487e | 240 | if (unlikely(ret < 0)) |
47420c79 | 241 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
242 | else |
243 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
244 | ||
572d8b39 | 245 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
7512487e | 246 | out: |
2a79f17e | 247 | mnt_drop_write_file(filp); |
7942b919 KS |
248 | return ret; |
249 | } | |
250 | ||
d623a942 VD |
251 | /** |
252 | * nilfs_ioctl_delete_checkpoint - remove checkpoint | |
253 | * @inode: inode object | |
254 | * @filp: file object | |
255 | * @cmd: ioctl's request code | |
256 | * @argp: pointer on argument from userspace | |
257 | * | |
258 | * Description: nilfs_ioctl_delete_checkpoint() function removes | |
259 | * checkpoint from NILFS2 file system. This ioctl is used in rmcp | |
260 | * utility. | |
261 | * | |
262 | * Return Value: On success, 0 is returned and a checkpoint is | |
263 | * removed. On error, one of the following negative error codes | |
264 | * is returned. | |
265 | * | |
266 | * %-EPERM - Operation not permitted. | |
267 | * | |
268 | * %-EFAULT - Failure during checkpoint removing. | |
269 | */ | |
7942b919 KS |
270 | static int |
271 | nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp, | |
272 | unsigned int cmd, void __user *argp) | |
273 | { | |
e3154e97 | 274 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 KS |
275 | struct nilfs_transaction_info ti; |
276 | __u64 cno; | |
277 | int ret; | |
278 | ||
279 | if (!capable(CAP_SYS_ADMIN)) | |
280 | return -EPERM; | |
7512487e | 281 | |
a561be71 | 282 | ret = mnt_want_write_file(filp); |
7512487e RK |
283 | if (ret) |
284 | return ret; | |
285 | ||
286 | ret = -EFAULT; | |
7942b919 | 287 | if (copy_from_user(&cno, argp, sizeof(cno))) |
7512487e | 288 | goto out; |
7942b919 KS |
289 | |
290 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
e3154e97 | 291 | ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno); |
7512487e | 292 | if (unlikely(ret < 0)) |
47420c79 | 293 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
294 | else |
295 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
296 | out: | |
2a79f17e | 297 | mnt_drop_write_file(filp); |
7942b919 KS |
298 | return ret; |
299 | } | |
300 | ||
d623a942 VD |
301 | /** |
302 | * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints | |
303 | * @nilfs: nilfs object | |
304 | * @posp: pointer on array of checkpoint's numbers | |
305 | * @flags: checkpoint mode (checkpoint or snapshot) | |
306 | * @buf: buffer for storing checkponts' info | |
307 | * @size: size in bytes of one checkpoint info item in array | |
308 | * @nmembs: number of checkpoints in array (numbers and infos) | |
309 | * | |
310 | * Description: nilfs_ioctl_do_get_cpinfo() function returns info about | |
311 | * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in | |
312 | * lscp utility and by nilfs_cleanerd daemon. | |
313 | * | |
314 | * Return value: count of nilfs_cpinfo structures in output buffer. | |
315 | */ | |
7942b919 | 316 | static ssize_t |
b028fcfc | 317 | nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
318 | void *buf, size_t size, size_t nmembs) |
319 | { | |
7942b919 KS |
320 | int ret; |
321 | ||
47420c79 | 322 | down_read(&nilfs->ns_segctor_sem); |
47eb6b9c | 323 | ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, |
003ff182 | 324 | size, nmembs); |
47420c79 | 325 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
326 | return ret; |
327 | } | |
328 | ||
d623a942 VD |
329 | /** |
330 | * nilfs_ioctl_get_cpstat - get checkpoints statistics | |
331 | * @inode: inode object | |
332 | * @filp: file object | |
333 | * @cmd: ioctl's request code | |
334 | * @argp: pointer on argument from userspace | |
335 | * | |
336 | * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints. | |
337 | * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities | |
338 | * and by nilfs_cleanerd daemon. | |
339 | * | |
340 | * Return Value: On success, 0 is returned, and checkpoints information is | |
341 | * copied into userspace pointer @argp. On error, one of the following | |
342 | * negative error codes is returned. | |
343 | * | |
344 | * %-EIO - I/O error. | |
345 | * | |
346 | * %-ENOMEM - Insufficient amount of memory available. | |
347 | * | |
348 | * %-EFAULT - Failure during getting checkpoints statistics. | |
349 | */ | |
7942b919 KS |
350 | static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp, |
351 | unsigned int cmd, void __user *argp) | |
352 | { | |
e3154e97 | 353 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 354 | struct nilfs_cpstat cpstat; |
7942b919 KS |
355 | int ret; |
356 | ||
47420c79 RK |
357 | down_read(&nilfs->ns_segctor_sem); |
358 | ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); | |
359 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
360 | if (ret < 0) |
361 | return ret; | |
362 | ||
363 | if (copy_to_user(argp, &cpstat, sizeof(cpstat))) | |
364 | ret = -EFAULT; | |
365 | return ret; | |
366 | } | |
367 | ||
d623a942 VD |
368 | /** |
369 | * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info | |
370 | * @nilfs: nilfs object | |
371 | * @posp: pointer on array of segment numbers | |
372 | * @flags: *not used* | |
373 | * @buf: buffer for storing suinfo array | |
374 | * @size: size in bytes of one suinfo item in array | |
375 | * @nmembs: count of segment numbers and suinfos in array | |
376 | * | |
377 | * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage | |
378 | * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used | |
379 | * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon. | |
380 | * | |
381 | * Return value: count of nilfs_suinfo structures in output buffer. | |
382 | */ | |
7942b919 | 383 | static ssize_t |
b028fcfc | 384 | nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
385 | void *buf, size_t size, size_t nmembs) |
386 | { | |
7942b919 KS |
387 | int ret; |
388 | ||
47420c79 | 389 | down_read(&nilfs->ns_segctor_sem); |
003ff182 RK |
390 | ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, |
391 | nmembs); | |
47420c79 | 392 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
393 | return ret; |
394 | } | |
395 | ||
d623a942 VD |
396 | /** |
397 | * nilfs_ioctl_get_sustat - get segment usage statistics | |
398 | * @inode: inode object | |
399 | * @filp: file object | |
400 | * @cmd: ioctl's request code | |
401 | * @argp: pointer on argument from userspace | |
402 | * | |
403 | * Description: nilfs_ioctl_get_sustat() returns segment usage statistics. | |
404 | * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities | |
405 | * and by nilfs_cleanerd daemon. | |
406 | * | |
407 | * Return Value: On success, 0 is returned, and segment usage information is | |
408 | * copied into userspace pointer @argp. On error, one of the following | |
409 | * negative error codes is returned. | |
410 | * | |
411 | * %-EIO - I/O error. | |
412 | * | |
413 | * %-ENOMEM - Insufficient amount of memory available. | |
414 | * | |
415 | * %-EFAULT - Failure during getting segment usage statistics. | |
416 | */ | |
7942b919 KS |
417 | static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp, |
418 | unsigned int cmd, void __user *argp) | |
419 | { | |
e3154e97 | 420 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 421 | struct nilfs_sustat sustat; |
7942b919 KS |
422 | int ret; |
423 | ||
47420c79 RK |
424 | down_read(&nilfs->ns_segctor_sem); |
425 | ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); | |
426 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
427 | if (ret < 0) |
428 | return ret; | |
429 | ||
430 | if (copy_to_user(argp, &sustat, sizeof(sustat))) | |
431 | ret = -EFAULT; | |
432 | return ret; | |
433 | } | |
434 | ||
d623a942 VD |
435 | /** |
436 | * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info | |
437 | * @nilfs: nilfs object | |
438 | * @posp: *not used* | |
439 | * @flags: *not used* | |
440 | * @buf: buffer for storing array of nilfs_vinfo structures | |
441 | * @size: size in bytes of one vinfo item in array | |
442 | * @nmembs: count of vinfos in array | |
443 | * | |
444 | * Description: nilfs_ioctl_do_get_vinfo() function returns information | |
445 | * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used | |
446 | * by nilfs_cleanerd daemon. | |
447 | * | |
448 | * Return value: count of nilfs_vinfo structures in output buffer. | |
449 | */ | |
7942b919 | 450 | static ssize_t |
b028fcfc | 451 | nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
452 | void *buf, size_t size, size_t nmembs) |
453 | { | |
7942b919 KS |
454 | int ret; |
455 | ||
47420c79 | 456 | down_read(&nilfs->ns_segctor_sem); |
365e215c | 457 | ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs); |
47420c79 | 458 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
459 | return ret; |
460 | } | |
461 | ||
d623a942 VD |
462 | /** |
463 | * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors | |
464 | * @nilfs: nilfs object | |
465 | * @posp: *not used* | |
466 | * @flags: *not used* | |
467 | * @buf: buffer for storing array of nilfs_bdesc structures | |
468 | * @size: size in bytes of one bdesc item in array | |
469 | * @nmembs: count of bdescs in array | |
470 | * | |
471 | * Description: nilfs_ioctl_do_get_bdescs() function returns information | |
472 | * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl | |
473 | * is used by nilfs_cleanerd daemon. | |
474 | * | |
475 | * Return value: count of nilfs_bdescs structures in output buffer. | |
476 | */ | |
7942b919 | 477 | static ssize_t |
b028fcfc | 478 | nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
479 | void *buf, size_t size, size_t nmembs) |
480 | { | |
365e215c | 481 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
7942b919 KS |
482 | struct nilfs_bdesc *bdescs = buf; |
483 | int ret, i; | |
484 | ||
47eb6b9c | 485 | down_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
486 | for (i = 0; i < nmembs; i++) { |
487 | ret = nilfs_bmap_lookup_at_level(bmap, | |
488 | bdescs[i].bd_offset, | |
489 | bdescs[i].bd_level + 1, | |
490 | &bdescs[i].bd_blocknr); | |
491 | if (ret < 0) { | |
47eb6b9c RK |
492 | if (ret != -ENOENT) { |
493 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 | 494 | return ret; |
47eb6b9c | 495 | } |
7942b919 KS |
496 | bdescs[i].bd_blocknr = 0; |
497 | } | |
498 | } | |
47eb6b9c | 499 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
500 | return nmembs; |
501 | } | |
502 | ||
d623a942 VD |
503 | /** |
504 | * nilfs_ioctl_get_bdescs - get disk block descriptors | |
505 | * @inode: inode object | |
506 | * @filp: file object | |
507 | * @cmd: ioctl's request code | |
508 | * @argp: pointer on argument from userspace | |
509 | * | |
510 | * Description: nilfs_ioctl_do_get_bdescs() function returns information | |
511 | * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl | |
512 | * is used by nilfs_cleanerd daemon. | |
513 | * | |
514 | * Return Value: On success, 0 is returned, and disk block descriptors are | |
515 | * copied into userspace pointer @argp. On error, one of the following | |
516 | * negative error codes is returned. | |
517 | * | |
518 | * %-EINVAL - Invalid arguments from userspace. | |
519 | * | |
520 | * %-EIO - I/O error. | |
521 | * | |
522 | * %-ENOMEM - Insufficient amount of memory available. | |
523 | * | |
524 | * %-EFAULT - Failure during getting disk block descriptors. | |
525 | */ | |
7942b919 KS |
526 | static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp, |
527 | unsigned int cmd, void __user *argp) | |
528 | { | |
e3154e97 | 529 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 530 | struct nilfs_argv argv; |
7942b919 KS |
531 | int ret; |
532 | ||
533 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
534 | return -EFAULT; | |
535 | ||
83aca8f4 RK |
536 | if (argv.v_size != sizeof(struct nilfs_bdesc)) |
537 | return -EINVAL; | |
538 | ||
7942b919 KS |
539 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), |
540 | nilfs_ioctl_do_get_bdescs); | |
47420c79 RK |
541 | if (ret < 0) |
542 | return ret; | |
7942b919 KS |
543 | |
544 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
545 | ret = -EFAULT; | |
546 | return ret; | |
547 | } | |
548 | ||
d623a942 VD |
549 | /** |
550 | * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC | |
551 | * @inode: inode object | |
552 | * @vdesc: descriptor of virtual block number | |
553 | * @buffers: list of moving buffers | |
554 | * | |
555 | * Description: nilfs_ioctl_move_inode_block() function registers data/node | |
556 | * buffer in the GC pagecache and submit read request. | |
557 | * | |
558 | * Return Value: On success, 0 is returned. On error, one of the following | |
559 | * negative error codes is returned. | |
560 | * | |
561 | * %-EIO - I/O error. | |
562 | * | |
563 | * %-ENOMEM - Insufficient amount of memory available. | |
564 | * | |
565 | * %-ENOENT - Requested block doesn't exist. | |
566 | * | |
567 | * %-EEXIST - Blocks conflict is detected. | |
568 | */ | |
7942b919 KS |
569 | static int nilfs_ioctl_move_inode_block(struct inode *inode, |
570 | struct nilfs_vdesc *vdesc, | |
571 | struct list_head *buffers) | |
572 | { | |
573 | struct buffer_head *bh; | |
574 | int ret; | |
575 | ||
576 | if (vdesc->vd_flags == 0) | |
577 | ret = nilfs_gccache_submit_read_data( | |
578 | inode, vdesc->vd_offset, vdesc->vd_blocknr, | |
579 | vdesc->vd_vblocknr, &bh); | |
580 | else | |
581 | ret = nilfs_gccache_submit_read_node( | |
582 | inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh); | |
583 | ||
584 | if (unlikely(ret < 0)) { | |
585 | if (ret == -ENOENT) | |
feee880f RK |
586 | nilfs_msg(inode->i_sb, KERN_CRIT, |
587 | "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu", | |
588 | __func__, vdesc->vd_flags ? "node" : "data", | |
589 | (unsigned long long)vdesc->vd_ino, | |
590 | (unsigned long long)vdesc->vd_cno, | |
591 | (unsigned long long)vdesc->vd_offset, | |
592 | (unsigned long long)vdesc->vd_blocknr, | |
593 | (unsigned long long)vdesc->vd_vblocknr); | |
7942b919 KS |
594 | return ret; |
595 | } | |
5399dd1f | 596 | if (unlikely(!list_empty(&bh->b_assoc_buffers))) { |
feee880f RK |
597 | nilfs_msg(inode->i_sb, KERN_CRIT, |
598 | "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu", | |
599 | __func__, vdesc->vd_flags ? "node" : "data", | |
600 | (unsigned long long)vdesc->vd_ino, | |
601 | (unsigned long long)vdesc->vd_cno, | |
602 | (unsigned long long)vdesc->vd_offset, | |
603 | (unsigned long long)vdesc->vd_blocknr, | |
604 | (unsigned long long)vdesc->vd_vblocknr); | |
5399dd1f RK |
605 | brelse(bh); |
606 | return -EEXIST; | |
607 | } | |
7942b919 KS |
608 | list_add_tail(&bh->b_assoc_buffers, buffers); |
609 | return 0; | |
610 | } | |
611 | ||
d623a942 VD |
612 | /** |
613 | * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection | |
614 | * @sb: superblock object | |
615 | * @argv: vector of arguments from userspace | |
616 | * @buf: array of nilfs_vdesc structures | |
617 | * | |
618 | * Description: nilfs_ioctl_move_blocks() function reads valid data/node | |
619 | * blocks that garbage collector specified with the array of nilfs_vdesc | |
620 | * structures and stores them into page caches of GC inodes. | |
621 | * | |
622 | * Return Value: Number of processed nilfs_vdesc structures or | |
623 | * error code, otherwise. | |
624 | */ | |
263d90ce | 625 | static int nilfs_ioctl_move_blocks(struct super_block *sb, |
4f6b8288 | 626 | struct nilfs_argv *argv, void *buf) |
7942b919 | 627 | { |
4f6b8288 | 628 | size_t nmembs = argv->v_nmembs; |
e3154e97 | 629 | struct the_nilfs *nilfs = sb->s_fs_info; |
7942b919 KS |
630 | struct inode *inode; |
631 | struct nilfs_vdesc *vdesc; | |
632 | struct buffer_head *bh, *n; | |
633 | LIST_HEAD(buffers); | |
634 | ino_t ino; | |
635 | __u64 cno; | |
636 | int i, ret; | |
637 | ||
638 | for (i = 0, vdesc = buf; i < nmembs; ) { | |
639 | ino = vdesc->vd_ino; | |
640 | cno = vdesc->vd_cno; | |
263d90ce | 641 | inode = nilfs_iget_for_gc(sb, ino, cno); |
103cfcf5 DC |
642 | if (IS_ERR(inode)) { |
643 | ret = PTR_ERR(inode); | |
7942b919 KS |
644 | goto failed; |
645 | } | |
947b10ae RK |
646 | if (list_empty(&NILFS_I(inode)->i_dirty)) { |
647 | /* | |
648 | * Add the inode to GC inode list. Garbage Collection | |
649 | * is serialized and no two processes manipulate the | |
650 | * list simultaneously. | |
651 | */ | |
652 | igrab(inode); | |
653 | list_add(&NILFS_I(inode)->i_dirty, | |
654 | &nilfs->ns_gc_inodes); | |
655 | } | |
656 | ||
7942b919 KS |
657 | do { |
658 | ret = nilfs_ioctl_move_inode_block(inode, vdesc, | |
659 | &buffers); | |
263d90ce RK |
660 | if (unlikely(ret < 0)) { |
661 | iput(inode); | |
7942b919 | 662 | goto failed; |
263d90ce | 663 | } |
7942b919 KS |
664 | vdesc++; |
665 | } while (++i < nmembs && | |
666 | vdesc->vd_ino == ino && vdesc->vd_cno == cno); | |
263d90ce RK |
667 | |
668 | iput(inode); /* The inode still remains in GC inode list */ | |
7942b919 KS |
669 | } |
670 | ||
671 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { | |
672 | ret = nilfs_gccache_wait_and_mark_dirty(bh); | |
673 | if (unlikely(ret < 0)) { | |
5399dd1f | 674 | WARN_ON(ret == -EEXIST); |
7942b919 KS |
675 | goto failed; |
676 | } | |
677 | list_del_init(&bh->b_assoc_buffers); | |
7942b919 KS |
678 | brelse(bh); |
679 | } | |
680 | return nmembs; | |
681 | ||
682 | failed: | |
683 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { | |
684 | list_del_init(&bh->b_assoc_buffers); | |
7942b919 KS |
685 | brelse(bh); |
686 | } | |
687 | return ret; | |
688 | } | |
689 | ||
d623a942 VD |
690 | /** |
691 | * nilfs_ioctl_delete_checkpoints - delete checkpoints | |
692 | * @nilfs: nilfs object | |
693 | * @argv: vector of arguments from userspace | |
694 | * @buf: array of periods of checkpoints numbers | |
695 | * | |
696 | * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints | |
697 | * in the period from p_start to p_end, excluding p_end itself. The checkpoints | |
698 | * which have been already deleted are ignored. | |
699 | * | |
700 | * Return Value: Number of processed nilfs_period structures or | |
701 | * error code, otherwise. | |
702 | * | |
703 | * %-EIO - I/O error. | |
704 | * | |
705 | * %-ENOMEM - Insufficient amount of memory available. | |
706 | * | |
707 | * %-EINVAL - invalid checkpoints. | |
708 | */ | |
4f6b8288 RK |
709 | static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs, |
710 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 711 | { |
4f6b8288 | 712 | size_t nmembs = argv->v_nmembs; |
7942b919 KS |
713 | struct inode *cpfile = nilfs->ns_cpfile; |
714 | struct nilfs_period *periods = buf; | |
715 | int ret, i; | |
716 | ||
717 | for (i = 0; i < nmembs; i++) { | |
718 | ret = nilfs_cpfile_delete_checkpoints( | |
719 | cpfile, periods[i].p_start, periods[i].p_end); | |
720 | if (ret < 0) | |
721 | return ret; | |
722 | } | |
723 | return nmembs; | |
724 | } | |
725 | ||
d623a942 VD |
726 | /** |
727 | * nilfs_ioctl_free_vblocknrs - free virtual block numbers | |
728 | * @nilfs: nilfs object | |
729 | * @argv: vector of arguments from userspace | |
730 | * @buf: array of virtual block numbers | |
731 | * | |
732 | * Description: nilfs_ioctl_free_vblocknrs() function frees | |
733 | * the virtual block numbers specified by @buf and @argv->v_nmembs. | |
734 | * | |
735 | * Return Value: Number of processed virtual block numbers or | |
736 | * error code, otherwise. | |
737 | * | |
738 | * %-EIO - I/O error. | |
739 | * | |
740 | * %-ENOMEM - Insufficient amount of memory available. | |
741 | * | |
742 | * %-ENOENT - The virtual block number have not been allocated. | |
743 | */ | |
4f6b8288 RK |
744 | static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs, |
745 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 746 | { |
4f6b8288 RK |
747 | size_t nmembs = argv->v_nmembs; |
748 | int ret; | |
7942b919 | 749 | |
365e215c | 750 | ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs); |
7942b919 KS |
751 | |
752 | return (ret < 0) ? ret : nmembs; | |
753 | } | |
754 | ||
d623a942 VD |
755 | /** |
756 | * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty | |
757 | * @nilfs: nilfs object | |
758 | * @argv: vector of arguments from userspace | |
759 | * @buf: array of block descriptors | |
760 | * | |
761 | * Description: nilfs_ioctl_mark_blocks_dirty() function marks | |
762 | * metadata file or data blocks as dirty. | |
763 | * | |
764 | * Return Value: Number of processed block descriptors or | |
765 | * error code, otherwise. | |
766 | * | |
767 | * %-ENOMEM - Insufficient memory available. | |
768 | * | |
769 | * %-EIO - I/O error | |
770 | * | |
771 | * %-ENOENT - the specified block does not exist (hole block) | |
772 | */ | |
4f6b8288 RK |
773 | static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs, |
774 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 775 | { |
4f6b8288 | 776 | size_t nmembs = argv->v_nmembs; |
365e215c | 777 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
7942b919 | 778 | struct nilfs_bdesc *bdescs = buf; |
24e20ead | 779 | struct buffer_head *bh; |
7942b919 KS |
780 | int ret, i; |
781 | ||
782 | for (i = 0; i < nmembs; i++) { | |
783 | /* XXX: use macro or inline func to check liveness */ | |
784 | ret = nilfs_bmap_lookup_at_level(bmap, | |
785 | bdescs[i].bd_offset, | |
786 | bdescs[i].bd_level + 1, | |
787 | &bdescs[i].bd_blocknr); | |
788 | if (ret < 0) { | |
789 | if (ret != -ENOENT) | |
790 | return ret; | |
791 | bdescs[i].bd_blocknr = 0; | |
792 | } | |
793 | if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr) | |
794 | /* skip dead block */ | |
795 | continue; | |
796 | if (bdescs[i].bd_level == 0) { | |
24e20ead RK |
797 | ret = nilfs_mdt_get_block(nilfs->ns_dat, |
798 | bdescs[i].bd_offset, | |
799 | false, NULL, &bh); | |
800 | if (unlikely(ret)) { | |
1f5abe7e | 801 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
802 | return ret; |
803 | } | |
24e20ead RK |
804 | mark_buffer_dirty(bh); |
805 | nilfs_mdt_mark_dirty(nilfs->ns_dat); | |
806 | put_bh(bh); | |
7942b919 KS |
807 | } else { |
808 | ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset, | |
809 | bdescs[i].bd_level); | |
810 | if (ret < 0) { | |
1f5abe7e | 811 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
812 | return ret; |
813 | } | |
814 | } | |
815 | } | |
816 | return nmembs; | |
817 | } | |
818 | ||
7942b919 | 819 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs, |
4f6b8288 | 820 | struct nilfs_argv *argv, void **kbufs) |
7942b919 | 821 | { |
1f5abe7e | 822 | const char *msg; |
4f6b8288 | 823 | int ret; |
7942b919 | 824 | |
4f6b8288 | 825 | ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]); |
1f5abe7e RK |
826 | if (ret < 0) { |
827 | /* | |
828 | * can safely abort because checkpoints can be removed | |
829 | * independently. | |
830 | */ | |
831 | msg = "cannot delete checkpoints"; | |
832 | goto failed; | |
833 | } | |
4f6b8288 | 834 | ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]); |
1f5abe7e RK |
835 | if (ret < 0) { |
836 | /* | |
837 | * can safely abort because DAT file is updated atomically | |
838 | * using a copy-on-write technique. | |
839 | */ | |
840 | msg = "cannot delete virtual blocks from DAT file"; | |
841 | goto failed; | |
842 | } | |
4f6b8288 | 843 | ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]); |
1f5abe7e RK |
844 | if (ret < 0) { |
845 | /* | |
846 | * can safely abort because the operation is nondestructive. | |
847 | */ | |
848 | msg = "cannot mark copying blocks dirty"; | |
849 | goto failed; | |
850 | } | |
7942b919 KS |
851 | return 0; |
852 | ||
1f5abe7e | 853 | failed: |
feee880f RK |
854 | nilfs_msg(nilfs->ns_sb, KERN_ERR, "error %d preparing GC: %s", ret, |
855 | msg); | |
7942b919 KS |
856 | return ret; |
857 | } | |
858 | ||
d623a942 VD |
859 | /** |
860 | * nilfs_ioctl_clean_segments - clean segments | |
861 | * @inode: inode object | |
862 | * @filp: file object | |
863 | * @cmd: ioctl's request code | |
864 | * @argp: pointer on argument from userspace | |
865 | * | |
866 | * Description: nilfs_ioctl_clean_segments() function makes garbage | |
867 | * collection operation in the environment of requested parameters | |
868 | * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by | |
869 | * nilfs_cleanerd daemon. | |
870 | * | |
871 | * Return Value: On success, 0 is returned or error code, otherwise. | |
872 | */ | |
7942b919 KS |
873 | static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, |
874 | unsigned int cmd, void __user *argp) | |
875 | { | |
4f6b8288 | 876 | struct nilfs_argv argv[5]; |
33e189bd | 877 | static const size_t argsz[5] = { |
4f6b8288 RK |
878 | sizeof(struct nilfs_vdesc), |
879 | sizeof(struct nilfs_period), | |
880 | sizeof(__u64), | |
881 | sizeof(struct nilfs_bdesc), | |
882 | sizeof(__u64), | |
883 | }; | |
884 | void __user *base; | |
885 | void *kbufs[5]; | |
886 | struct the_nilfs *nilfs; | |
887 | size_t len, nsegs; | |
888 | int n, ret; | |
889 | ||
7942b919 KS |
890 | if (!capable(CAP_SYS_ADMIN)) |
891 | return -EPERM; | |
4f6b8288 | 892 | |
a561be71 | 893 | ret = mnt_want_write_file(filp); |
7512487e RK |
894 | if (ret) |
895 | return ret; | |
896 | ||
897 | ret = -EFAULT; | |
4f6b8288 | 898 | if (copy_from_user(argv, argp, sizeof(argv))) |
7512487e | 899 | goto out; |
4f6b8288 | 900 | |
7512487e | 901 | ret = -EINVAL; |
4f6b8288 RK |
902 | nsegs = argv[4].v_nmembs; |
903 | if (argv[4].v_size != argsz[4]) | |
7512487e | 904 | goto out; |
1ecd3c7e XW |
905 | if (nsegs > UINT_MAX / sizeof(__u64)) |
906 | goto out; | |
7512487e | 907 | |
4f6b8288 RK |
908 | /* |
909 | * argv[4] points to segment numbers this ioctl cleans. We | |
910 | * use kmalloc() for its buffer because memory used for the | |
911 | * segment numbers is enough small. | |
912 | */ | |
913 | kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base, | |
914 | nsegs * sizeof(__u64)); | |
7512487e RK |
915 | if (IS_ERR(kbufs[4])) { |
916 | ret = PTR_ERR(kbufs[4]); | |
917 | goto out; | |
918 | } | |
e3154e97 | 919 | nilfs = inode->i_sb->s_fs_info; |
4f6b8288 RK |
920 | |
921 | for (n = 0; n < 4; n++) { | |
922 | ret = -EINVAL; | |
923 | if (argv[n].v_size != argsz[n]) | |
924 | goto out_free; | |
925 | ||
926 | if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment) | |
927 | goto out_free; | |
928 | ||
481fe17e HC |
929 | if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size) |
930 | goto out_free; | |
931 | ||
4f6b8288 RK |
932 | len = argv[n].v_size * argv[n].v_nmembs; |
933 | base = (void __user *)(unsigned long)argv[n].v_base; | |
934 | if (len == 0) { | |
935 | kbufs[n] = NULL; | |
936 | continue; | |
937 | } | |
938 | ||
939 | kbufs[n] = vmalloc(len); | |
940 | if (!kbufs[n]) { | |
941 | ret = -ENOMEM; | |
942 | goto out_free; | |
943 | } | |
944 | if (copy_from_user(kbufs[n], base, len)) { | |
945 | ret = -EFAULT; | |
946 | vfree(kbufs[n]); | |
947 | goto out_free; | |
948 | } | |
949 | } | |
950 | ||
1cf58fa8 | 951 | /* |
263d90ce | 952 | * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(), |
1cf58fa8 JS |
953 | * which will operates an inode list without blocking. |
954 | * To protect the list from concurrent operations, | |
955 | * nilfs_ioctl_move_blocks should be atomic operation. | |
956 | */ | |
957 | if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) { | |
958 | ret = -EBUSY; | |
959 | goto out_free; | |
960 | } | |
961 | ||
263d90ce | 962 | ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]); |
feee880f RK |
963 | if (ret < 0) { |
964 | nilfs_msg(inode->i_sb, KERN_ERR, | |
965 | "error %d preparing GC: cannot read source blocks", | |
966 | ret); | |
967 | } else { | |
a9bae189 VD |
968 | if (nilfs_sb_need_update(nilfs)) |
969 | set_nilfs_discontinued(nilfs); | |
1cf58fa8 | 970 | ret = nilfs_clean_segments(inode->i_sb, argv, kbufs); |
a9bae189 | 971 | } |
1cf58fa8 | 972 | |
263d90ce | 973 | nilfs_remove_all_gcinodes(nilfs); |
1cf58fa8 | 974 | clear_nilfs_gc_running(nilfs); |
4f6b8288 | 975 | |
7512487e | 976 | out_free: |
d5046853 | 977 | while (--n >= 0) |
4f6b8288 RK |
978 | vfree(kbufs[n]); |
979 | kfree(kbufs[4]); | |
7512487e | 980 | out: |
2a79f17e | 981 | mnt_drop_write_file(filp); |
4f6b8288 | 982 | return ret; |
7942b919 KS |
983 | } |
984 | ||
d623a942 VD |
985 | /** |
986 | * nilfs_ioctl_sync - make a checkpoint | |
987 | * @inode: inode object | |
988 | * @filp: file object | |
989 | * @cmd: ioctl's request code | |
990 | * @argp: pointer on argument from userspace | |
991 | * | |
992 | * Description: nilfs_ioctl_sync() function constructs a logical segment | |
993 | * for checkpointing. This function guarantees that all modified data | |
994 | * and metadata are written out to the device when it successfully | |
995 | * returned. | |
996 | * | |
997 | * Return Value: On success, 0 is retured. On errors, one of the following | |
998 | * negative error code is returned. | |
999 | * | |
1000 | * %-EROFS - Read only filesystem. | |
1001 | * | |
1002 | * %-EIO - I/O error | |
1003 | * | |
1004 | * %-ENOSPC - No space left on device (only in a panic state). | |
1005 | * | |
1006 | * %-ERESTARTSYS - Interrupted. | |
1007 | * | |
1008 | * %-ENOMEM - Insufficient memory available. | |
1009 | * | |
1010 | * %-EFAULT - Failure during execution of requested operation. | |
1011 | */ | |
7942b919 KS |
1012 | static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, |
1013 | unsigned int cmd, void __user *argp) | |
1014 | { | |
1015 | __u64 cno; | |
1016 | int ret; | |
0d561f12 | 1017 | struct the_nilfs *nilfs; |
7942b919 KS |
1018 | |
1019 | ret = nilfs_construct_segment(inode->i_sb); | |
1020 | if (ret < 0) | |
1021 | return ret; | |
1022 | ||
11475975 | 1023 | nilfs = inode->i_sb->s_fs_info; |
e2c7617a AR |
1024 | ret = nilfs_flush_device(nilfs); |
1025 | if (ret < 0) | |
1026 | return ret; | |
11475975 | 1027 | |
7942b919 | 1028 | if (argp != NULL) { |
0d561f12 JS |
1029 | down_read(&nilfs->ns_segctor_sem); |
1030 | cno = nilfs->ns_cno - 1; | |
1031 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
1032 | if (copy_to_user(argp, &cno, sizeof(cno))) |
1033 | return -EFAULT; | |
1034 | } | |
1035 | return 0; | |
1036 | } | |
1037 | ||
d623a942 VD |
1038 | /** |
1039 | * nilfs_ioctl_resize - resize NILFS2 volume | |
1040 | * @inode: inode object | |
1041 | * @filp: file object | |
1042 | * @argp: pointer on argument from userspace | |
1043 | * | |
1044 | * Return Value: On success, 0 is returned or error code, otherwise. | |
1045 | */ | |
4e33f9ea RK |
1046 | static int nilfs_ioctl_resize(struct inode *inode, struct file *filp, |
1047 | void __user *argp) | |
1048 | { | |
1049 | __u64 newsize; | |
1050 | int ret = -EPERM; | |
1051 | ||
1052 | if (!capable(CAP_SYS_ADMIN)) | |
1053 | goto out; | |
1054 | ||
a561be71 | 1055 | ret = mnt_want_write_file(filp); |
4e33f9ea RK |
1056 | if (ret) |
1057 | goto out; | |
1058 | ||
1059 | ret = -EFAULT; | |
1060 | if (copy_from_user(&newsize, argp, sizeof(newsize))) | |
1061 | goto out_drop_write; | |
1062 | ||
1063 | ret = nilfs_resize_fs(inode->i_sb, newsize); | |
1064 | ||
1065 | out_drop_write: | |
2a79f17e | 1066 | mnt_drop_write_file(filp); |
4e33f9ea RK |
1067 | out: |
1068 | return ret; | |
1069 | } | |
1070 | ||
f9f32c44 AR |
1071 | /** |
1072 | * nilfs_ioctl_trim_fs() - trim ioctl handle function | |
1073 | * @inode: inode object | |
1074 | * @argp: pointer on argument from userspace | |
1075 | * | |
1076 | * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It | |
1077 | * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which | |
1078 | * performs the actual trim operation. | |
1079 | * | |
1080 | * Return Value: On success, 0 is returned or negative error code, otherwise. | |
1081 | */ | |
1082 | static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp) | |
1083 | { | |
1084 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1085 | struct request_queue *q = bdev_get_queue(nilfs->ns_bdev); | |
1086 | struct fstrim_range range; | |
1087 | int ret; | |
1088 | ||
1089 | if (!capable(CAP_SYS_ADMIN)) | |
1090 | return -EPERM; | |
1091 | ||
1092 | if (!blk_queue_discard(q)) | |
1093 | return -EOPNOTSUPP; | |
1094 | ||
1095 | if (copy_from_user(&range, argp, sizeof(range))) | |
1096 | return -EFAULT; | |
1097 | ||
1098 | range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity); | |
1099 | ||
1100 | down_read(&nilfs->ns_segctor_sem); | |
1101 | ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range); | |
1102 | up_read(&nilfs->ns_segctor_sem); | |
1103 | ||
1104 | if (ret < 0) | |
1105 | return ret; | |
1106 | ||
1107 | if (copy_to_user(argp, &range, sizeof(range))) | |
1108 | return -EFAULT; | |
1109 | ||
1110 | return 0; | |
1111 | } | |
1112 | ||
d623a942 VD |
1113 | /** |
1114 | * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated | |
1115 | * @inode: inode object | |
1116 | * @argp: pointer on argument from userspace | |
1117 | * | |
1118 | * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit | |
1119 | * of segments in bytes and upper limit of segments in bytes. | |
1120 | * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility. | |
1121 | * | |
1122 | * Return Value: On success, 0 is returned or error code, otherwise. | |
1123 | */ | |
619205da RK |
1124 | static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp) |
1125 | { | |
1126 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1127 | __u64 range[2]; | |
1128 | __u64 minseg, maxseg; | |
1129 | unsigned long segbytes; | |
1130 | int ret = -EPERM; | |
1131 | ||
1132 | if (!capable(CAP_SYS_ADMIN)) | |
1133 | goto out; | |
1134 | ||
1135 | ret = -EFAULT; | |
1136 | if (copy_from_user(range, argp, sizeof(__u64[2]))) | |
1137 | goto out; | |
1138 | ||
1139 | ret = -ERANGE; | |
1140 | if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode)) | |
1141 | goto out; | |
1142 | ||
1143 | segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize; | |
1144 | ||
1145 | minseg = range[0] + segbytes - 1; | |
1146 | do_div(minseg, segbytes); | |
1147 | maxseg = NILFS_SB2_OFFSET_BYTES(range[1]); | |
1148 | do_div(maxseg, segbytes); | |
1149 | maxseg--; | |
1150 | ||
1151 | ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg); | |
1152 | out: | |
1153 | return ret; | |
1154 | } | |
1155 | ||
d623a942 VD |
1156 | /** |
1157 | * nilfs_ioctl_get_info - wrapping function of get metadata info | |
1158 | * @inode: inode object | |
1159 | * @filp: file object | |
1160 | * @cmd: ioctl's request code | |
1161 | * @argp: pointer on argument from userspace | |
1162 | * @membsz: size of an item in bytes | |
1163 | * @dofunc: concrete function of getting metadata info | |
1164 | * | |
1165 | * Description: nilfs_ioctl_get_info() gets metadata info by means of | |
1166 | * calling dofunc() function. | |
1167 | * | |
1168 | * Return Value: On success, 0 is returned and requested metadata info | |
1169 | * is copied into userspace. On error, one of the following | |
1170 | * negative error codes is returned. | |
1171 | * | |
1172 | * %-EINVAL - Invalid arguments from userspace. | |
1173 | * | |
1174 | * %-ENOMEM - Insufficient amount of memory available. | |
1175 | * | |
1176 | * %-EFAULT - Failure during execution of requested operation. | |
1177 | */ | |
47eb6b9c RK |
1178 | static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, |
1179 | unsigned int cmd, void __user *argp, | |
83aca8f4 | 1180 | size_t membsz, |
47eb6b9c RK |
1181 | ssize_t (*dofunc)(struct the_nilfs *, |
1182 | __u64 *, int, | |
1183 | void *, size_t, size_t)) | |
1184 | ||
1185 | { | |
e3154e97 | 1186 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
47eb6b9c RK |
1187 | struct nilfs_argv argv; |
1188 | int ret; | |
1189 | ||
1190 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1191 | return -EFAULT; | |
1192 | ||
003ff182 | 1193 | if (argv.v_size < membsz) |
83aca8f4 RK |
1194 | return -EINVAL; |
1195 | ||
47eb6b9c RK |
1196 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc); |
1197 | if (ret < 0) | |
1198 | return ret; | |
1199 | ||
1200 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
1201 | ret = -EFAULT; | |
1202 | return ret; | |
1203 | } | |
1204 | ||
2cc88f3a AR |
1205 | /** |
1206 | * nilfs_ioctl_set_suinfo - set segment usage info | |
1207 | * @inode: inode object | |
1208 | * @filp: file object | |
1209 | * @cmd: ioctl's request code | |
1210 | * @argp: pointer on argument from userspace | |
1211 | * | |
1212 | * Description: Expects an array of nilfs_suinfo_update structures | |
1213 | * encapsulated in nilfs_argv and updates the segment usage info | |
1214 | * according to the flags in nilfs_suinfo_update. | |
1215 | * | |
1216 | * Return Value: On success, 0 is returned. On error, one of the | |
1217 | * following negative error codes is returned. | |
1218 | * | |
1219 | * %-EPERM - Not enough permissions | |
1220 | * | |
1221 | * %-EFAULT - Error copying input data | |
1222 | * | |
1223 | * %-EIO - I/O error. | |
1224 | * | |
1225 | * %-ENOMEM - Insufficient amount of memory available. | |
1226 | * | |
1227 | * %-EINVAL - Invalid values in input (segment number, flags or nblocks) | |
1228 | */ | |
1229 | static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp, | |
1230 | unsigned int cmd, void __user *argp) | |
1231 | { | |
1232 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1233 | struct nilfs_transaction_info ti; | |
1234 | struct nilfs_argv argv; | |
1235 | size_t len; | |
1236 | void __user *base; | |
1237 | void *kbuf; | |
1238 | int ret; | |
1239 | ||
1240 | if (!capable(CAP_SYS_ADMIN)) | |
1241 | return -EPERM; | |
1242 | ||
1243 | ret = mnt_want_write_file(filp); | |
1244 | if (ret) | |
1245 | return ret; | |
1246 | ||
1247 | ret = -EFAULT; | |
1248 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1249 | goto out; | |
1250 | ||
1251 | ret = -EINVAL; | |
1252 | if (argv.v_size < sizeof(struct nilfs_suinfo_update)) | |
1253 | goto out; | |
1254 | ||
1255 | if (argv.v_nmembs > nilfs->ns_nsegments) | |
1256 | goto out; | |
1257 | ||
1258 | if (argv.v_nmembs >= UINT_MAX / argv.v_size) | |
1259 | goto out; | |
1260 | ||
1261 | len = argv.v_size * argv.v_nmembs; | |
1262 | if (!len) { | |
1263 | ret = 0; | |
1264 | goto out; | |
1265 | } | |
1266 | ||
1267 | base = (void __user *)(unsigned long)argv.v_base; | |
1268 | kbuf = vmalloc(len); | |
1269 | if (!kbuf) { | |
1270 | ret = -ENOMEM; | |
1271 | goto out; | |
1272 | } | |
1273 | ||
1274 | if (copy_from_user(kbuf, base, len)) { | |
1275 | ret = -EFAULT; | |
1276 | goto out_free; | |
1277 | } | |
1278 | ||
1279 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
1280 | ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size, | |
1281 | argv.v_nmembs); | |
1282 | if (unlikely(ret < 0)) | |
1283 | nilfs_transaction_abort(inode->i_sb); | |
1284 | else | |
1285 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
1286 | ||
1287 | out_free: | |
1288 | vfree(kbuf); | |
1289 | out: | |
1290 | mnt_drop_write_file(filp); | |
1291 | return ret; | |
1292 | } | |
1293 | ||
7a946193 | 1294 | long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
7942b919 | 1295 | { |
496ad9aa | 1296 | struct inode *inode = file_inode(filp); |
75323400 | 1297 | void __user *argp = (void __user *)arg; |
7942b919 KS |
1298 | |
1299 | switch (cmd) { | |
cde98f0f RK |
1300 | case FS_IOC_GETFLAGS: |
1301 | return nilfs_ioctl_getflags(inode, argp); | |
1302 | case FS_IOC_SETFLAGS: | |
1303 | return nilfs_ioctl_setflags(inode, filp, argp); | |
1304 | case FS_IOC_GETVERSION: | |
1305 | return nilfs_ioctl_getversion(inode, argp); | |
7942b919 KS |
1306 | case NILFS_IOCTL_CHANGE_CPMODE: |
1307 | return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp); | |
1308 | case NILFS_IOCTL_DELETE_CHECKPOINT: | |
1309 | return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp); | |
1310 | case NILFS_IOCTL_GET_CPINFO: | |
47eb6b9c | 1311 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1312 | sizeof(struct nilfs_cpinfo), |
47eb6b9c | 1313 | nilfs_ioctl_do_get_cpinfo); |
7942b919 KS |
1314 | case NILFS_IOCTL_GET_CPSTAT: |
1315 | return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); | |
1316 | case NILFS_IOCTL_GET_SUINFO: | |
47eb6b9c | 1317 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1318 | sizeof(struct nilfs_suinfo), |
47eb6b9c | 1319 | nilfs_ioctl_do_get_suinfo); |
2cc88f3a AR |
1320 | case NILFS_IOCTL_SET_SUINFO: |
1321 | return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp); | |
7942b919 KS |
1322 | case NILFS_IOCTL_GET_SUSTAT: |
1323 | return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); | |
1324 | case NILFS_IOCTL_GET_VINFO: | |
47eb6b9c | 1325 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1326 | sizeof(struct nilfs_vinfo), |
47eb6b9c | 1327 | nilfs_ioctl_do_get_vinfo); |
7942b919 KS |
1328 | case NILFS_IOCTL_GET_BDESCS: |
1329 | return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp); | |
1330 | case NILFS_IOCTL_CLEAN_SEGMENTS: | |
1331 | return nilfs_ioctl_clean_segments(inode, filp, cmd, argp); | |
7942b919 KS |
1332 | case NILFS_IOCTL_SYNC: |
1333 | return nilfs_ioctl_sync(inode, filp, cmd, argp); | |
4e33f9ea RK |
1334 | case NILFS_IOCTL_RESIZE: |
1335 | return nilfs_ioctl_resize(inode, filp, argp); | |
619205da RK |
1336 | case NILFS_IOCTL_SET_ALLOC_RANGE: |
1337 | return nilfs_ioctl_set_alloc_range(inode, argp); | |
f9f32c44 AR |
1338 | case FITRIM: |
1339 | return nilfs_ioctl_trim_fs(inode, argp); | |
7942b919 KS |
1340 | default: |
1341 | return -ENOTTY; | |
1342 | } | |
1343 | } | |
828b1c50 RK |
1344 | |
1345 | #ifdef CONFIG_COMPAT | |
1346 | long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1347 | { | |
1348 | switch (cmd) { | |
1349 | case FS_IOC32_GETFLAGS: | |
1350 | cmd = FS_IOC_GETFLAGS; | |
1351 | break; | |
1352 | case FS_IOC32_SETFLAGS: | |
1353 | cmd = FS_IOC_SETFLAGS; | |
1354 | break; | |
1355 | case FS_IOC32_GETVERSION: | |
1356 | cmd = FS_IOC_GETVERSION; | |
1357 | break; | |
695c60f2 TM |
1358 | case NILFS_IOCTL_CHANGE_CPMODE: |
1359 | case NILFS_IOCTL_DELETE_CHECKPOINT: | |
1360 | case NILFS_IOCTL_GET_CPINFO: | |
1361 | case NILFS_IOCTL_GET_CPSTAT: | |
1362 | case NILFS_IOCTL_GET_SUINFO: | |
2cc88f3a | 1363 | case NILFS_IOCTL_SET_SUINFO: |
695c60f2 TM |
1364 | case NILFS_IOCTL_GET_SUSTAT: |
1365 | case NILFS_IOCTL_GET_VINFO: | |
1366 | case NILFS_IOCTL_GET_BDESCS: | |
1367 | case NILFS_IOCTL_CLEAN_SEGMENTS: | |
1368 | case NILFS_IOCTL_SYNC: | |
1369 | case NILFS_IOCTL_RESIZE: | |
1370 | case NILFS_IOCTL_SET_ALLOC_RANGE: | |
1371 | break; | |
828b1c50 RK |
1372 | default: |
1373 | return -ENOIOCTLCMD; | |
1374 | } | |
1375 | return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1376 | } | |
1377 | #endif |