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1 | /* | |
2 | * ioctl.c - NILFS ioctl operations. | |
3 | * | |
4 | * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * Written by Koji Sato. | |
17 | */ | |
18 | ||
19 | #include <linux/fs.h> | |
20 | #include <linux/wait.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/capability.h> /* capable() */ | |
23 | #include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */ | |
24 | #include <linux/vmalloc.h> | |
25 | #include <linux/compat.h> /* compat_ptr() */ | |
26 | #include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */ | |
27 | #include <linux/buffer_head.h> | |
28 | #include <linux/nilfs2_fs.h> | |
29 | #include "nilfs.h" | |
30 | #include "segment.h" | |
31 | #include "bmap.h" | |
32 | #include "cpfile.h" | |
33 | #include "sufile.h" | |
34 | #include "dat.h" | |
35 | ||
36 | /** | |
37 | * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info | |
38 | * @nilfs: nilfs object | |
39 | * @argv: vector of arguments from userspace | |
40 | * @dir: set of direction flags | |
41 | * @dofunc: concrete function of get/set metadata info | |
42 | * | |
43 | * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of | |
44 | * calling dofunc() function on the basis of @argv argument. | |
45 | * | |
46 | * Return Value: On success, 0 is returned and requested metadata info | |
47 | * is copied into userspace. On error, one of the following | |
48 | * negative error codes is returned. | |
49 | * | |
50 | * %-EINVAL - Invalid arguments from userspace. | |
51 | * | |
52 | * %-ENOMEM - Insufficient amount of memory available. | |
53 | * | |
54 | * %-EFAULT - Failure during execution of requested operation. | |
55 | */ | |
56 | static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs, | |
57 | struct nilfs_argv *argv, int dir, | |
58 | ssize_t (*dofunc)(struct the_nilfs *, | |
59 | __u64 *, int, | |
60 | void *, size_t, size_t)) | |
61 | { | |
62 | void *buf; | |
63 | void __user *base = (void __user *)(unsigned long)argv->v_base; | |
64 | size_t maxmembs, total, n; | |
65 | ssize_t nr; | |
66 | int ret, i; | |
67 | __u64 pos, ppos; | |
68 | ||
69 | if (argv->v_nmembs == 0) | |
70 | return 0; | |
71 | ||
72 | if (argv->v_size > PAGE_SIZE) | |
73 | return -EINVAL; | |
74 | ||
75 | /* | |
76 | * Reject pairs of a start item position (argv->v_index) and a | |
77 | * total count (argv->v_nmembs) which leads position 'pos' to | |
78 | * overflow by the increment at the end of the loop. | |
79 | */ | |
80 | if (argv->v_index > ~(__u64)0 - argv->v_nmembs) | |
81 | return -EINVAL; | |
82 | ||
83 | buf = (void *)__get_free_pages(GFP_NOFS, 0); | |
84 | if (unlikely(!buf)) | |
85 | return -ENOMEM; | |
86 | maxmembs = PAGE_SIZE / argv->v_size; | |
87 | ||
88 | ret = 0; | |
89 | total = 0; | |
90 | pos = argv->v_index; | |
91 | for (i = 0; i < argv->v_nmembs; i += n) { | |
92 | n = (argv->v_nmembs - i < maxmembs) ? | |
93 | argv->v_nmembs - i : maxmembs; | |
94 | if ((dir & _IOC_WRITE) && | |
95 | copy_from_user(buf, base + argv->v_size * i, | |
96 | argv->v_size * n)) { | |
97 | ret = -EFAULT; | |
98 | break; | |
99 | } | |
100 | ppos = pos; | |
101 | nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size, | |
102 | n); | |
103 | if (nr < 0) { | |
104 | ret = nr; | |
105 | break; | |
106 | } | |
107 | if ((dir & _IOC_READ) && | |
108 | copy_to_user(base + argv->v_size * i, buf, | |
109 | argv->v_size * nr)) { | |
110 | ret = -EFAULT; | |
111 | break; | |
112 | } | |
113 | total += nr; | |
114 | if ((size_t)nr < n) | |
115 | break; | |
116 | if (pos == ppos) | |
117 | pos += n; | |
118 | } | |
119 | argv->v_nmembs = total; | |
120 | ||
121 | free_pages((unsigned long)buf, 0); | |
122 | return ret; | |
123 | } | |
124 | ||
125 | /** | |
126 | * nilfs_ioctl_getflags - ioctl to support lsattr | |
127 | */ | |
128 | static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp) | |
129 | { | |
130 | unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE; | |
131 | ||
132 | return put_user(flags, (int __user *)argp); | |
133 | } | |
134 | ||
135 | /** | |
136 | * nilfs_ioctl_setflags - ioctl to support chattr | |
137 | */ | |
138 | static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp, | |
139 | void __user *argp) | |
140 | { | |
141 | struct nilfs_transaction_info ti; | |
142 | unsigned int flags, oldflags; | |
143 | int ret; | |
144 | ||
145 | if (!inode_owner_or_capable(inode)) | |
146 | return -EACCES; | |
147 | ||
148 | if (get_user(flags, (int __user *)argp)) | |
149 | return -EFAULT; | |
150 | ||
151 | ret = mnt_want_write_file(filp); | |
152 | if (ret) | |
153 | return ret; | |
154 | ||
155 | flags = nilfs_mask_flags(inode->i_mode, flags); | |
156 | ||
157 | inode_lock(inode); | |
158 | ||
159 | oldflags = NILFS_I(inode)->i_flags; | |
160 | ||
161 | /* | |
162 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by the | |
163 | * relevant capability. | |
164 | */ | |
165 | ret = -EPERM; | |
166 | if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) && | |
167 | !capable(CAP_LINUX_IMMUTABLE)) | |
168 | goto out; | |
169 | ||
170 | ret = nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
171 | if (ret) | |
172 | goto out; | |
173 | ||
174 | NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) | | |
175 | (flags & FS_FL_USER_MODIFIABLE); | |
176 | ||
177 | nilfs_set_inode_flags(inode); | |
178 | inode->i_ctime = CURRENT_TIME; | |
179 | if (IS_SYNC(inode)) | |
180 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
181 | ||
182 | nilfs_mark_inode_dirty(inode); | |
183 | ret = nilfs_transaction_commit(inode->i_sb); | |
184 | out: | |
185 | inode_unlock(inode); | |
186 | mnt_drop_write_file(filp); | |
187 | return ret; | |
188 | } | |
189 | ||
190 | /** | |
191 | * nilfs_ioctl_getversion - get info about a file's version (generation number) | |
192 | */ | |
193 | static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp) | |
194 | { | |
195 | return put_user(inode->i_generation, (int __user *)argp); | |
196 | } | |
197 | ||
198 | /** | |
199 | * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot) | |
200 | * @inode: inode object | |
201 | * @filp: file object | |
202 | * @cmd: ioctl's request code | |
203 | * @argp: pointer on argument from userspace | |
204 | * | |
205 | * Description: nilfs_ioctl_change_cpmode() function changes mode of | |
206 | * given checkpoint between checkpoint and snapshot state. This ioctl | |
207 | * is used in chcp and mkcp utilities. | |
208 | * | |
209 | * Return Value: On success, 0 is returned and mode of a checkpoint is | |
210 | * changed. On error, one of the following negative error codes | |
211 | * is returned. | |
212 | * | |
213 | * %-EPERM - Operation not permitted. | |
214 | * | |
215 | * %-EFAULT - Failure during checkpoint mode changing. | |
216 | */ | |
217 | static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp, | |
218 | unsigned int cmd, void __user *argp) | |
219 | { | |
220 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
221 | struct nilfs_transaction_info ti; | |
222 | struct nilfs_cpmode cpmode; | |
223 | int ret; | |
224 | ||
225 | if (!capable(CAP_SYS_ADMIN)) | |
226 | return -EPERM; | |
227 | ||
228 | ret = mnt_want_write_file(filp); | |
229 | if (ret) | |
230 | return ret; | |
231 | ||
232 | ret = -EFAULT; | |
233 | if (copy_from_user(&cpmode, argp, sizeof(cpmode))) | |
234 | goto out; | |
235 | ||
236 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); | |
237 | ||
238 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
239 | ret = nilfs_cpfile_change_cpmode( | |
240 | nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode); | |
241 | if (unlikely(ret < 0)) | |
242 | nilfs_transaction_abort(inode->i_sb); | |
243 | else | |
244 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
245 | ||
246 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); | |
247 | out: | |
248 | mnt_drop_write_file(filp); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | /** | |
253 | * nilfs_ioctl_delete_checkpoint - remove checkpoint | |
254 | * @inode: inode object | |
255 | * @filp: file object | |
256 | * @cmd: ioctl's request code | |
257 | * @argp: pointer on argument from userspace | |
258 | * | |
259 | * Description: nilfs_ioctl_delete_checkpoint() function removes | |
260 | * checkpoint from NILFS2 file system. This ioctl is used in rmcp | |
261 | * utility. | |
262 | * | |
263 | * Return Value: On success, 0 is returned and a checkpoint is | |
264 | * removed. On error, one of the following negative error codes | |
265 | * is returned. | |
266 | * | |
267 | * %-EPERM - Operation not permitted. | |
268 | * | |
269 | * %-EFAULT - Failure during checkpoint removing. | |
270 | */ | |
271 | static int | |
272 | nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp, | |
273 | unsigned int cmd, void __user *argp) | |
274 | { | |
275 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
276 | struct nilfs_transaction_info ti; | |
277 | __u64 cno; | |
278 | int ret; | |
279 | ||
280 | if (!capable(CAP_SYS_ADMIN)) | |
281 | return -EPERM; | |
282 | ||
283 | ret = mnt_want_write_file(filp); | |
284 | if (ret) | |
285 | return ret; | |
286 | ||
287 | ret = -EFAULT; | |
288 | if (copy_from_user(&cno, argp, sizeof(cno))) | |
289 | goto out; | |
290 | ||
291 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
292 | ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno); | |
293 | if (unlikely(ret < 0)) | |
294 | nilfs_transaction_abort(inode->i_sb); | |
295 | else | |
296 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
297 | out: | |
298 | mnt_drop_write_file(filp); | |
299 | return ret; | |
300 | } | |
301 | ||
302 | /** | |
303 | * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints | |
304 | * @nilfs: nilfs object | |
305 | * @posp: pointer on array of checkpoint's numbers | |
306 | * @flags: checkpoint mode (checkpoint or snapshot) | |
307 | * @buf: buffer for storing checkponts' info | |
308 | * @size: size in bytes of one checkpoint info item in array | |
309 | * @nmembs: number of checkpoints in array (numbers and infos) | |
310 | * | |
311 | * Description: nilfs_ioctl_do_get_cpinfo() function returns info about | |
312 | * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in | |
313 | * lscp utility and by nilfs_cleanerd daemon. | |
314 | * | |
315 | * Return value: count of nilfs_cpinfo structures in output buffer. | |
316 | */ | |
317 | static ssize_t | |
318 | nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, | |
319 | void *buf, size_t size, size_t nmembs) | |
320 | { | |
321 | int ret; | |
322 | ||
323 | down_read(&nilfs->ns_segctor_sem); | |
324 | ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, | |
325 | size, nmembs); | |
326 | up_read(&nilfs->ns_segctor_sem); | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /** | |
331 | * nilfs_ioctl_get_cpstat - get checkpoints statistics | |
332 | * @inode: inode object | |
333 | * @filp: file object | |
334 | * @cmd: ioctl's request code | |
335 | * @argp: pointer on argument from userspace | |
336 | * | |
337 | * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints. | |
338 | * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities | |
339 | * and by nilfs_cleanerd daemon. | |
340 | * | |
341 | * Return Value: On success, 0 is returned, and checkpoints information is | |
342 | * copied into userspace pointer @argp. On error, one of the following | |
343 | * negative error codes is returned. | |
344 | * | |
345 | * %-EIO - I/O error. | |
346 | * | |
347 | * %-ENOMEM - Insufficient amount of memory available. | |
348 | * | |
349 | * %-EFAULT - Failure during getting checkpoints statistics. | |
350 | */ | |
351 | static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp, | |
352 | unsigned int cmd, void __user *argp) | |
353 | { | |
354 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
355 | struct nilfs_cpstat cpstat; | |
356 | int ret; | |
357 | ||
358 | down_read(&nilfs->ns_segctor_sem); | |
359 | ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); | |
360 | up_read(&nilfs->ns_segctor_sem); | |
361 | if (ret < 0) | |
362 | return ret; | |
363 | ||
364 | if (copy_to_user(argp, &cpstat, sizeof(cpstat))) | |
365 | ret = -EFAULT; | |
366 | return ret; | |
367 | } | |
368 | ||
369 | /** | |
370 | * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info | |
371 | * @nilfs: nilfs object | |
372 | * @posp: pointer on array of segment numbers | |
373 | * @flags: *not used* | |
374 | * @buf: buffer for storing suinfo array | |
375 | * @size: size in bytes of one suinfo item in array | |
376 | * @nmembs: count of segment numbers and suinfos in array | |
377 | * | |
378 | * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage | |
379 | * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used | |
380 | * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon. | |
381 | * | |
382 | * Return value: count of nilfs_suinfo structures in output buffer. | |
383 | */ | |
384 | static ssize_t | |
385 | nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, | |
386 | void *buf, size_t size, size_t nmembs) | |
387 | { | |
388 | int ret; | |
389 | ||
390 | down_read(&nilfs->ns_segctor_sem); | |
391 | ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, | |
392 | nmembs); | |
393 | up_read(&nilfs->ns_segctor_sem); | |
394 | return ret; | |
395 | } | |
396 | ||
397 | /** | |
398 | * nilfs_ioctl_get_sustat - get segment usage statistics | |
399 | * @inode: inode object | |
400 | * @filp: file object | |
401 | * @cmd: ioctl's request code | |
402 | * @argp: pointer on argument from userspace | |
403 | * | |
404 | * Description: nilfs_ioctl_get_sustat() returns segment usage statistics. | |
405 | * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities | |
406 | * and by nilfs_cleanerd daemon. | |
407 | * | |
408 | * Return Value: On success, 0 is returned, and segment usage information is | |
409 | * copied into userspace pointer @argp. On error, one of the following | |
410 | * negative error codes is returned. | |
411 | * | |
412 | * %-EIO - I/O error. | |
413 | * | |
414 | * %-ENOMEM - Insufficient amount of memory available. | |
415 | * | |
416 | * %-EFAULT - Failure during getting segment usage statistics. | |
417 | */ | |
418 | static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp, | |
419 | unsigned int cmd, void __user *argp) | |
420 | { | |
421 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
422 | struct nilfs_sustat sustat; | |
423 | int ret; | |
424 | ||
425 | down_read(&nilfs->ns_segctor_sem); | |
426 | ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); | |
427 | up_read(&nilfs->ns_segctor_sem); | |
428 | if (ret < 0) | |
429 | return ret; | |
430 | ||
431 | if (copy_to_user(argp, &sustat, sizeof(sustat))) | |
432 | ret = -EFAULT; | |
433 | return ret; | |
434 | } | |
435 | ||
436 | /** | |
437 | * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info | |
438 | * @nilfs: nilfs object | |
439 | * @posp: *not used* | |
440 | * @flags: *not used* | |
441 | * @buf: buffer for storing array of nilfs_vinfo structures | |
442 | * @size: size in bytes of one vinfo item in array | |
443 | * @nmembs: count of vinfos in array | |
444 | * | |
445 | * Description: nilfs_ioctl_do_get_vinfo() function returns information | |
446 | * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used | |
447 | * by nilfs_cleanerd daemon. | |
448 | * | |
449 | * Return value: count of nilfs_vinfo structures in output buffer. | |
450 | */ | |
451 | static ssize_t | |
452 | nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, | |
453 | void *buf, size_t size, size_t nmembs) | |
454 | { | |
455 | int ret; | |
456 | ||
457 | down_read(&nilfs->ns_segctor_sem); | |
458 | ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs); | |
459 | up_read(&nilfs->ns_segctor_sem); | |
460 | return ret; | |
461 | } | |
462 | ||
463 | /** | |
464 | * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors | |
465 | * @nilfs: nilfs object | |
466 | * @posp: *not used* | |
467 | * @flags: *not used* | |
468 | * @buf: buffer for storing array of nilfs_bdesc structures | |
469 | * @size: size in bytes of one bdesc item in array | |
470 | * @nmembs: count of bdescs in array | |
471 | * | |
472 | * Description: nilfs_ioctl_do_get_bdescs() function returns information | |
473 | * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl | |
474 | * is used by nilfs_cleanerd daemon. | |
475 | * | |
476 | * Return value: count of nilfs_bdescs structures in output buffer. | |
477 | */ | |
478 | static ssize_t | |
479 | nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags, | |
480 | void *buf, size_t size, size_t nmembs) | |
481 | { | |
482 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; | |
483 | struct nilfs_bdesc *bdescs = buf; | |
484 | int ret, i; | |
485 | ||
486 | down_read(&nilfs->ns_segctor_sem); | |
487 | for (i = 0; i < nmembs; i++) { | |
488 | ret = nilfs_bmap_lookup_at_level(bmap, | |
489 | bdescs[i].bd_offset, | |
490 | bdescs[i].bd_level + 1, | |
491 | &bdescs[i].bd_blocknr); | |
492 | if (ret < 0) { | |
493 | if (ret != -ENOENT) { | |
494 | up_read(&nilfs->ns_segctor_sem); | |
495 | return ret; | |
496 | } | |
497 | bdescs[i].bd_blocknr = 0; | |
498 | } | |
499 | } | |
500 | up_read(&nilfs->ns_segctor_sem); | |
501 | return nmembs; | |
502 | } | |
503 | ||
504 | /** | |
505 | * nilfs_ioctl_get_bdescs - get disk block descriptors | |
506 | * @inode: inode object | |
507 | * @filp: file object | |
508 | * @cmd: ioctl's request code | |
509 | * @argp: pointer on argument from userspace | |
510 | * | |
511 | * Description: nilfs_ioctl_do_get_bdescs() function returns information | |
512 | * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl | |
513 | * is used by nilfs_cleanerd daemon. | |
514 | * | |
515 | * Return Value: On success, 0 is returned, and disk block descriptors are | |
516 | * copied into userspace pointer @argp. On error, one of the following | |
517 | * negative error codes is returned. | |
518 | * | |
519 | * %-EINVAL - Invalid arguments from userspace. | |
520 | * | |
521 | * %-EIO - I/O error. | |
522 | * | |
523 | * %-ENOMEM - Insufficient amount of memory available. | |
524 | * | |
525 | * %-EFAULT - Failure during getting disk block descriptors. | |
526 | */ | |
527 | static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp, | |
528 | unsigned int cmd, void __user *argp) | |
529 | { | |
530 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
531 | struct nilfs_argv argv; | |
532 | int ret; | |
533 | ||
534 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
535 | return -EFAULT; | |
536 | ||
537 | if (argv.v_size != sizeof(struct nilfs_bdesc)) | |
538 | return -EINVAL; | |
539 | ||
540 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), | |
541 | nilfs_ioctl_do_get_bdescs); | |
542 | if (ret < 0) | |
543 | return ret; | |
544 | ||
545 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
546 | ret = -EFAULT; | |
547 | return ret; | |
548 | } | |
549 | ||
550 | /** | |
551 | * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC | |
552 | * @inode: inode object | |
553 | * @vdesc: descriptor of virtual block number | |
554 | * @buffers: list of moving buffers | |
555 | * | |
556 | * Description: nilfs_ioctl_move_inode_block() function registers data/node | |
557 | * buffer in the GC pagecache and submit read request. | |
558 | * | |
559 | * Return Value: On success, 0 is returned. On error, one of the following | |
560 | * negative error codes is returned. | |
561 | * | |
562 | * %-EIO - I/O error. | |
563 | * | |
564 | * %-ENOMEM - Insufficient amount of memory available. | |
565 | * | |
566 | * %-ENOENT - Requested block doesn't exist. | |
567 | * | |
568 | * %-EEXIST - Blocks conflict is detected. | |
569 | */ | |
570 | static int nilfs_ioctl_move_inode_block(struct inode *inode, | |
571 | struct nilfs_vdesc *vdesc, | |
572 | struct list_head *buffers) | |
573 | { | |
574 | struct buffer_head *bh; | |
575 | int ret; | |
576 | ||
577 | if (vdesc->vd_flags == 0) | |
578 | ret = nilfs_gccache_submit_read_data( | |
579 | inode, vdesc->vd_offset, vdesc->vd_blocknr, | |
580 | vdesc->vd_vblocknr, &bh); | |
581 | else | |
582 | ret = nilfs_gccache_submit_read_node( | |
583 | inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh); | |
584 | ||
585 | if (unlikely(ret < 0)) { | |
586 | if (ret == -ENOENT) | |
587 | printk(KERN_CRIT | |
588 | "%s: invalid virtual block address (%s): " | |
589 | "ino=%llu, cno=%llu, offset=%llu, " | |
590 | "blocknr=%llu, vblocknr=%llu\n", | |
591 | __func__, vdesc->vd_flags ? "node" : "data", | |
592 | (unsigned long long)vdesc->vd_ino, | |
593 | (unsigned long long)vdesc->vd_cno, | |
594 | (unsigned long long)vdesc->vd_offset, | |
595 | (unsigned long long)vdesc->vd_blocknr, | |
596 | (unsigned long long)vdesc->vd_vblocknr); | |
597 | return ret; | |
598 | } | |
599 | if (unlikely(!list_empty(&bh->b_assoc_buffers))) { | |
600 | printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, " | |
601 | "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n", | |
602 | __func__, vdesc->vd_flags ? "node" : "data", | |
603 | (unsigned long long)vdesc->vd_ino, | |
604 | (unsigned long long)vdesc->vd_cno, | |
605 | (unsigned long long)vdesc->vd_offset, | |
606 | (unsigned long long)vdesc->vd_blocknr, | |
607 | (unsigned long long)vdesc->vd_vblocknr); | |
608 | brelse(bh); | |
609 | return -EEXIST; | |
610 | } | |
611 | list_add_tail(&bh->b_assoc_buffers, buffers); | |
612 | return 0; | |
613 | } | |
614 | ||
615 | /** | |
616 | * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection | |
617 | * @sb: superblock object | |
618 | * @argv: vector of arguments from userspace | |
619 | * @buf: array of nilfs_vdesc structures | |
620 | * | |
621 | * Description: nilfs_ioctl_move_blocks() function reads valid data/node | |
622 | * blocks that garbage collector specified with the array of nilfs_vdesc | |
623 | * structures and stores them into page caches of GC inodes. | |
624 | * | |
625 | * Return Value: Number of processed nilfs_vdesc structures or | |
626 | * error code, otherwise. | |
627 | */ | |
628 | static int nilfs_ioctl_move_blocks(struct super_block *sb, | |
629 | struct nilfs_argv *argv, void *buf) | |
630 | { | |
631 | size_t nmembs = argv->v_nmembs; | |
632 | struct the_nilfs *nilfs = sb->s_fs_info; | |
633 | struct inode *inode; | |
634 | struct nilfs_vdesc *vdesc; | |
635 | struct buffer_head *bh, *n; | |
636 | LIST_HEAD(buffers); | |
637 | ino_t ino; | |
638 | __u64 cno; | |
639 | int i, ret; | |
640 | ||
641 | for (i = 0, vdesc = buf; i < nmembs; ) { | |
642 | ino = vdesc->vd_ino; | |
643 | cno = vdesc->vd_cno; | |
644 | inode = nilfs_iget_for_gc(sb, ino, cno); | |
645 | if (IS_ERR(inode)) { | |
646 | ret = PTR_ERR(inode); | |
647 | goto failed; | |
648 | } | |
649 | if (list_empty(&NILFS_I(inode)->i_dirty)) { | |
650 | /* | |
651 | * Add the inode to GC inode list. Garbage Collection | |
652 | * is serialized and no two processes manipulate the | |
653 | * list simultaneously. | |
654 | */ | |
655 | igrab(inode); | |
656 | list_add(&NILFS_I(inode)->i_dirty, | |
657 | &nilfs->ns_gc_inodes); | |
658 | } | |
659 | ||
660 | do { | |
661 | ret = nilfs_ioctl_move_inode_block(inode, vdesc, | |
662 | &buffers); | |
663 | if (unlikely(ret < 0)) { | |
664 | iput(inode); | |
665 | goto failed; | |
666 | } | |
667 | vdesc++; | |
668 | } while (++i < nmembs && | |
669 | vdesc->vd_ino == ino && vdesc->vd_cno == cno); | |
670 | ||
671 | iput(inode); /* The inode still remains in GC inode list */ | |
672 | } | |
673 | ||
674 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { | |
675 | ret = nilfs_gccache_wait_and_mark_dirty(bh); | |
676 | if (unlikely(ret < 0)) { | |
677 | WARN_ON(ret == -EEXIST); | |
678 | goto failed; | |
679 | } | |
680 | list_del_init(&bh->b_assoc_buffers); | |
681 | brelse(bh); | |
682 | } | |
683 | return nmembs; | |
684 | ||
685 | failed: | |
686 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { | |
687 | list_del_init(&bh->b_assoc_buffers); | |
688 | brelse(bh); | |
689 | } | |
690 | return ret; | |
691 | } | |
692 | ||
693 | /** | |
694 | * nilfs_ioctl_delete_checkpoints - delete checkpoints | |
695 | * @nilfs: nilfs object | |
696 | * @argv: vector of arguments from userspace | |
697 | * @buf: array of periods of checkpoints numbers | |
698 | * | |
699 | * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints | |
700 | * in the period from p_start to p_end, excluding p_end itself. The checkpoints | |
701 | * which have been already deleted are ignored. | |
702 | * | |
703 | * Return Value: Number of processed nilfs_period structures or | |
704 | * error code, otherwise. | |
705 | * | |
706 | * %-EIO - I/O error. | |
707 | * | |
708 | * %-ENOMEM - Insufficient amount of memory available. | |
709 | * | |
710 | * %-EINVAL - invalid checkpoints. | |
711 | */ | |
712 | static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs, | |
713 | struct nilfs_argv *argv, void *buf) | |
714 | { | |
715 | size_t nmembs = argv->v_nmembs; | |
716 | struct inode *cpfile = nilfs->ns_cpfile; | |
717 | struct nilfs_period *periods = buf; | |
718 | int ret, i; | |
719 | ||
720 | for (i = 0; i < nmembs; i++) { | |
721 | ret = nilfs_cpfile_delete_checkpoints( | |
722 | cpfile, periods[i].p_start, periods[i].p_end); | |
723 | if (ret < 0) | |
724 | return ret; | |
725 | } | |
726 | return nmembs; | |
727 | } | |
728 | ||
729 | /** | |
730 | * nilfs_ioctl_free_vblocknrs - free virtual block numbers | |
731 | * @nilfs: nilfs object | |
732 | * @argv: vector of arguments from userspace | |
733 | * @buf: array of virtual block numbers | |
734 | * | |
735 | * Description: nilfs_ioctl_free_vblocknrs() function frees | |
736 | * the virtual block numbers specified by @buf and @argv->v_nmembs. | |
737 | * | |
738 | * Return Value: Number of processed virtual block numbers or | |
739 | * error code, otherwise. | |
740 | * | |
741 | * %-EIO - I/O error. | |
742 | * | |
743 | * %-ENOMEM - Insufficient amount of memory available. | |
744 | * | |
745 | * %-ENOENT - The virtual block number have not been allocated. | |
746 | */ | |
747 | static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs, | |
748 | struct nilfs_argv *argv, void *buf) | |
749 | { | |
750 | size_t nmembs = argv->v_nmembs; | |
751 | int ret; | |
752 | ||
753 | ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs); | |
754 | ||
755 | return (ret < 0) ? ret : nmembs; | |
756 | } | |
757 | ||
758 | /** | |
759 | * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty | |
760 | * @nilfs: nilfs object | |
761 | * @argv: vector of arguments from userspace | |
762 | * @buf: array of block descriptors | |
763 | * | |
764 | * Description: nilfs_ioctl_mark_blocks_dirty() function marks | |
765 | * metadata file or data blocks as dirty. | |
766 | * | |
767 | * Return Value: Number of processed block descriptors or | |
768 | * error code, otherwise. | |
769 | * | |
770 | * %-ENOMEM - Insufficient memory available. | |
771 | * | |
772 | * %-EIO - I/O error | |
773 | * | |
774 | * %-ENOENT - the specified block does not exist (hole block) | |
775 | */ | |
776 | static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs, | |
777 | struct nilfs_argv *argv, void *buf) | |
778 | { | |
779 | size_t nmembs = argv->v_nmembs; | |
780 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; | |
781 | struct nilfs_bdesc *bdescs = buf; | |
782 | struct buffer_head *bh; | |
783 | int ret, i; | |
784 | ||
785 | for (i = 0; i < nmembs; i++) { | |
786 | /* XXX: use macro or inline func to check liveness */ | |
787 | ret = nilfs_bmap_lookup_at_level(bmap, | |
788 | bdescs[i].bd_offset, | |
789 | bdescs[i].bd_level + 1, | |
790 | &bdescs[i].bd_blocknr); | |
791 | if (ret < 0) { | |
792 | if (ret != -ENOENT) | |
793 | return ret; | |
794 | bdescs[i].bd_blocknr = 0; | |
795 | } | |
796 | if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr) | |
797 | /* skip dead block */ | |
798 | continue; | |
799 | if (bdescs[i].bd_level == 0) { | |
800 | ret = nilfs_mdt_get_block(nilfs->ns_dat, | |
801 | bdescs[i].bd_offset, | |
802 | false, NULL, &bh); | |
803 | if (unlikely(ret)) { | |
804 | WARN_ON(ret == -ENOENT); | |
805 | return ret; | |
806 | } | |
807 | mark_buffer_dirty(bh); | |
808 | nilfs_mdt_mark_dirty(nilfs->ns_dat); | |
809 | put_bh(bh); | |
810 | } else { | |
811 | ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset, | |
812 | bdescs[i].bd_level); | |
813 | if (ret < 0) { | |
814 | WARN_ON(ret == -ENOENT); | |
815 | return ret; | |
816 | } | |
817 | } | |
818 | } | |
819 | return nmembs; | |
820 | } | |
821 | ||
822 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs, | |
823 | struct nilfs_argv *argv, void **kbufs) | |
824 | { | |
825 | const char *msg; | |
826 | int ret; | |
827 | ||
828 | ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]); | |
829 | if (ret < 0) { | |
830 | /* | |
831 | * can safely abort because checkpoints can be removed | |
832 | * independently. | |
833 | */ | |
834 | msg = "cannot delete checkpoints"; | |
835 | goto failed; | |
836 | } | |
837 | ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]); | |
838 | if (ret < 0) { | |
839 | /* | |
840 | * can safely abort because DAT file is updated atomically | |
841 | * using a copy-on-write technique. | |
842 | */ | |
843 | msg = "cannot delete virtual blocks from DAT file"; | |
844 | goto failed; | |
845 | } | |
846 | ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]); | |
847 | if (ret < 0) { | |
848 | /* | |
849 | * can safely abort because the operation is nondestructive. | |
850 | */ | |
851 | msg = "cannot mark copying blocks dirty"; | |
852 | goto failed; | |
853 | } | |
854 | return 0; | |
855 | ||
856 | failed: | |
857 | printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n", | |
858 | msg, ret); | |
859 | return ret; | |
860 | } | |
861 | ||
862 | /** | |
863 | * nilfs_ioctl_clean_segments - clean segments | |
864 | * @inode: inode object | |
865 | * @filp: file object | |
866 | * @cmd: ioctl's request code | |
867 | * @argp: pointer on argument from userspace | |
868 | * | |
869 | * Description: nilfs_ioctl_clean_segments() function makes garbage | |
870 | * collection operation in the environment of requested parameters | |
871 | * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by | |
872 | * nilfs_cleanerd daemon. | |
873 | * | |
874 | * Return Value: On success, 0 is returned or error code, otherwise. | |
875 | */ | |
876 | static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, | |
877 | unsigned int cmd, void __user *argp) | |
878 | { | |
879 | struct nilfs_argv argv[5]; | |
880 | static const size_t argsz[5] = { | |
881 | sizeof(struct nilfs_vdesc), | |
882 | sizeof(struct nilfs_period), | |
883 | sizeof(__u64), | |
884 | sizeof(struct nilfs_bdesc), | |
885 | sizeof(__u64), | |
886 | }; | |
887 | void __user *base; | |
888 | void *kbufs[5]; | |
889 | struct the_nilfs *nilfs; | |
890 | size_t len, nsegs; | |
891 | int n, ret; | |
892 | ||
893 | if (!capable(CAP_SYS_ADMIN)) | |
894 | return -EPERM; | |
895 | ||
896 | ret = mnt_want_write_file(filp); | |
897 | if (ret) | |
898 | return ret; | |
899 | ||
900 | ret = -EFAULT; | |
901 | if (copy_from_user(argv, argp, sizeof(argv))) | |
902 | goto out; | |
903 | ||
904 | ret = -EINVAL; | |
905 | nsegs = argv[4].v_nmembs; | |
906 | if (argv[4].v_size != argsz[4]) | |
907 | goto out; | |
908 | if (nsegs > UINT_MAX / sizeof(__u64)) | |
909 | goto out; | |
910 | ||
911 | /* | |
912 | * argv[4] points to segment numbers this ioctl cleans. We | |
913 | * use kmalloc() for its buffer because memory used for the | |
914 | * segment numbers is enough small. | |
915 | */ | |
916 | kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base, | |
917 | nsegs * sizeof(__u64)); | |
918 | if (IS_ERR(kbufs[4])) { | |
919 | ret = PTR_ERR(kbufs[4]); | |
920 | goto out; | |
921 | } | |
922 | nilfs = inode->i_sb->s_fs_info; | |
923 | ||
924 | for (n = 0; n < 4; n++) { | |
925 | ret = -EINVAL; | |
926 | if (argv[n].v_size != argsz[n]) | |
927 | goto out_free; | |
928 | ||
929 | if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment) | |
930 | goto out_free; | |
931 | ||
932 | if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size) | |
933 | goto out_free; | |
934 | ||
935 | len = argv[n].v_size * argv[n].v_nmembs; | |
936 | base = (void __user *)(unsigned long)argv[n].v_base; | |
937 | if (len == 0) { | |
938 | kbufs[n] = NULL; | |
939 | continue; | |
940 | } | |
941 | ||
942 | kbufs[n] = vmalloc(len); | |
943 | if (!kbufs[n]) { | |
944 | ret = -ENOMEM; | |
945 | goto out_free; | |
946 | } | |
947 | if (copy_from_user(kbufs[n], base, len)) { | |
948 | ret = -EFAULT; | |
949 | vfree(kbufs[n]); | |
950 | goto out_free; | |
951 | } | |
952 | } | |
953 | ||
954 | /* | |
955 | * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(), | |
956 | * which will operates an inode list without blocking. | |
957 | * To protect the list from concurrent operations, | |
958 | * nilfs_ioctl_move_blocks should be atomic operation. | |
959 | */ | |
960 | if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) { | |
961 | ret = -EBUSY; | |
962 | goto out_free; | |
963 | } | |
964 | ||
965 | ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]); | |
966 | if (ret < 0) | |
967 | printk(KERN_ERR "NILFS: GC failed during preparation: " | |
968 | "cannot read source blocks: err=%d\n", ret); | |
969 | else { | |
970 | if (nilfs_sb_need_update(nilfs)) | |
971 | set_nilfs_discontinued(nilfs); | |
972 | ret = nilfs_clean_segments(inode->i_sb, argv, kbufs); | |
973 | } | |
974 | ||
975 | nilfs_remove_all_gcinodes(nilfs); | |
976 | clear_nilfs_gc_running(nilfs); | |
977 | ||
978 | out_free: | |
979 | while (--n >= 0) | |
980 | vfree(kbufs[n]); | |
981 | kfree(kbufs[4]); | |
982 | out: | |
983 | mnt_drop_write_file(filp); | |
984 | return ret; | |
985 | } | |
986 | ||
987 | /** | |
988 | * nilfs_ioctl_sync - make a checkpoint | |
989 | * @inode: inode object | |
990 | * @filp: file object | |
991 | * @cmd: ioctl's request code | |
992 | * @argp: pointer on argument from userspace | |
993 | * | |
994 | * Description: nilfs_ioctl_sync() function constructs a logical segment | |
995 | * for checkpointing. This function guarantees that all modified data | |
996 | * and metadata are written out to the device when it successfully | |
997 | * returned. | |
998 | * | |
999 | * Return Value: On success, 0 is retured. On errors, one of the following | |
1000 | * negative error code is returned. | |
1001 | * | |
1002 | * %-EROFS - Read only filesystem. | |
1003 | * | |
1004 | * %-EIO - I/O error | |
1005 | * | |
1006 | * %-ENOSPC - No space left on device (only in a panic state). | |
1007 | * | |
1008 | * %-ERESTARTSYS - Interrupted. | |
1009 | * | |
1010 | * %-ENOMEM - Insufficient memory available. | |
1011 | * | |
1012 | * %-EFAULT - Failure during execution of requested operation. | |
1013 | */ | |
1014 | static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, | |
1015 | unsigned int cmd, void __user *argp) | |
1016 | { | |
1017 | __u64 cno; | |
1018 | int ret; | |
1019 | struct the_nilfs *nilfs; | |
1020 | ||
1021 | ret = nilfs_construct_segment(inode->i_sb); | |
1022 | if (ret < 0) | |
1023 | return ret; | |
1024 | ||
1025 | nilfs = inode->i_sb->s_fs_info; | |
1026 | ret = nilfs_flush_device(nilfs); | |
1027 | if (ret < 0) | |
1028 | return ret; | |
1029 | ||
1030 | if (argp != NULL) { | |
1031 | down_read(&nilfs->ns_segctor_sem); | |
1032 | cno = nilfs->ns_cno - 1; | |
1033 | up_read(&nilfs->ns_segctor_sem); | |
1034 | if (copy_to_user(argp, &cno, sizeof(cno))) | |
1035 | return -EFAULT; | |
1036 | } | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | /** | |
1041 | * nilfs_ioctl_resize - resize NILFS2 volume | |
1042 | * @inode: inode object | |
1043 | * @filp: file object | |
1044 | * @argp: pointer on argument from userspace | |
1045 | * | |
1046 | * Return Value: On success, 0 is returned or error code, otherwise. | |
1047 | */ | |
1048 | static int nilfs_ioctl_resize(struct inode *inode, struct file *filp, | |
1049 | void __user *argp) | |
1050 | { | |
1051 | __u64 newsize; | |
1052 | int ret = -EPERM; | |
1053 | ||
1054 | if (!capable(CAP_SYS_ADMIN)) | |
1055 | goto out; | |
1056 | ||
1057 | ret = mnt_want_write_file(filp); | |
1058 | if (ret) | |
1059 | goto out; | |
1060 | ||
1061 | ret = -EFAULT; | |
1062 | if (copy_from_user(&newsize, argp, sizeof(newsize))) | |
1063 | goto out_drop_write; | |
1064 | ||
1065 | ret = nilfs_resize_fs(inode->i_sb, newsize); | |
1066 | ||
1067 | out_drop_write: | |
1068 | mnt_drop_write_file(filp); | |
1069 | out: | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | /** | |
1074 | * nilfs_ioctl_trim_fs() - trim ioctl handle function | |
1075 | * @inode: inode object | |
1076 | * @argp: pointer on argument from userspace | |
1077 | * | |
1078 | * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It | |
1079 | * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which | |
1080 | * performs the actual trim operation. | |
1081 | * | |
1082 | * Return Value: On success, 0 is returned or negative error code, otherwise. | |
1083 | */ | |
1084 | static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp) | |
1085 | { | |
1086 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1087 | struct request_queue *q = bdev_get_queue(nilfs->ns_bdev); | |
1088 | struct fstrim_range range; | |
1089 | int ret; | |
1090 | ||
1091 | if (!capable(CAP_SYS_ADMIN)) | |
1092 | return -EPERM; | |
1093 | ||
1094 | if (!blk_queue_discard(q)) | |
1095 | return -EOPNOTSUPP; | |
1096 | ||
1097 | if (copy_from_user(&range, argp, sizeof(range))) | |
1098 | return -EFAULT; | |
1099 | ||
1100 | range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity); | |
1101 | ||
1102 | down_read(&nilfs->ns_segctor_sem); | |
1103 | ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range); | |
1104 | up_read(&nilfs->ns_segctor_sem); | |
1105 | ||
1106 | if (ret < 0) | |
1107 | return ret; | |
1108 | ||
1109 | if (copy_to_user(argp, &range, sizeof(range))) | |
1110 | return -EFAULT; | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated | |
1117 | * @inode: inode object | |
1118 | * @argp: pointer on argument from userspace | |
1119 | * | |
1120 | * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit | |
1121 | * of segments in bytes and upper limit of segments in bytes. | |
1122 | * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility. | |
1123 | * | |
1124 | * Return Value: On success, 0 is returned or error code, otherwise. | |
1125 | */ | |
1126 | static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp) | |
1127 | { | |
1128 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1129 | __u64 range[2]; | |
1130 | __u64 minseg, maxseg; | |
1131 | unsigned long segbytes; | |
1132 | int ret = -EPERM; | |
1133 | ||
1134 | if (!capable(CAP_SYS_ADMIN)) | |
1135 | goto out; | |
1136 | ||
1137 | ret = -EFAULT; | |
1138 | if (copy_from_user(range, argp, sizeof(__u64[2]))) | |
1139 | goto out; | |
1140 | ||
1141 | ret = -ERANGE; | |
1142 | if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode)) | |
1143 | goto out; | |
1144 | ||
1145 | segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize; | |
1146 | ||
1147 | minseg = range[0] + segbytes - 1; | |
1148 | do_div(minseg, segbytes); | |
1149 | maxseg = NILFS_SB2_OFFSET_BYTES(range[1]); | |
1150 | do_div(maxseg, segbytes); | |
1151 | maxseg--; | |
1152 | ||
1153 | ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg); | |
1154 | out: | |
1155 | return ret; | |
1156 | } | |
1157 | ||
1158 | /** | |
1159 | * nilfs_ioctl_get_info - wrapping function of get metadata info | |
1160 | * @inode: inode object | |
1161 | * @filp: file object | |
1162 | * @cmd: ioctl's request code | |
1163 | * @argp: pointer on argument from userspace | |
1164 | * @membsz: size of an item in bytes | |
1165 | * @dofunc: concrete function of getting metadata info | |
1166 | * | |
1167 | * Description: nilfs_ioctl_get_info() gets metadata info by means of | |
1168 | * calling dofunc() function. | |
1169 | * | |
1170 | * Return Value: On success, 0 is returned and requested metadata info | |
1171 | * is copied into userspace. On error, one of the following | |
1172 | * negative error codes is returned. | |
1173 | * | |
1174 | * %-EINVAL - Invalid arguments from userspace. | |
1175 | * | |
1176 | * %-ENOMEM - Insufficient amount of memory available. | |
1177 | * | |
1178 | * %-EFAULT - Failure during execution of requested operation. | |
1179 | */ | |
1180 | static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, | |
1181 | unsigned int cmd, void __user *argp, | |
1182 | size_t membsz, | |
1183 | ssize_t (*dofunc)(struct the_nilfs *, | |
1184 | __u64 *, int, | |
1185 | void *, size_t, size_t)) | |
1186 | ||
1187 | { | |
1188 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1189 | struct nilfs_argv argv; | |
1190 | int ret; | |
1191 | ||
1192 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1193 | return -EFAULT; | |
1194 | ||
1195 | if (argv.v_size < membsz) | |
1196 | return -EINVAL; | |
1197 | ||
1198 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc); | |
1199 | if (ret < 0) | |
1200 | return ret; | |
1201 | ||
1202 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
1203 | ret = -EFAULT; | |
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | /** | |
1208 | * nilfs_ioctl_set_suinfo - set segment usage info | |
1209 | * @inode: inode object | |
1210 | * @filp: file object | |
1211 | * @cmd: ioctl's request code | |
1212 | * @argp: pointer on argument from userspace | |
1213 | * | |
1214 | * Description: Expects an array of nilfs_suinfo_update structures | |
1215 | * encapsulated in nilfs_argv and updates the segment usage info | |
1216 | * according to the flags in nilfs_suinfo_update. | |
1217 | * | |
1218 | * Return Value: On success, 0 is returned. On error, one of the | |
1219 | * following negative error codes is returned. | |
1220 | * | |
1221 | * %-EPERM - Not enough permissions | |
1222 | * | |
1223 | * %-EFAULT - Error copying input data | |
1224 | * | |
1225 | * %-EIO - I/O error. | |
1226 | * | |
1227 | * %-ENOMEM - Insufficient amount of memory available. | |
1228 | * | |
1229 | * %-EINVAL - Invalid values in input (segment number, flags or nblocks) | |
1230 | */ | |
1231 | static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp, | |
1232 | unsigned int cmd, void __user *argp) | |
1233 | { | |
1234 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1235 | struct nilfs_transaction_info ti; | |
1236 | struct nilfs_argv argv; | |
1237 | size_t len; | |
1238 | void __user *base; | |
1239 | void *kbuf; | |
1240 | int ret; | |
1241 | ||
1242 | if (!capable(CAP_SYS_ADMIN)) | |
1243 | return -EPERM; | |
1244 | ||
1245 | ret = mnt_want_write_file(filp); | |
1246 | if (ret) | |
1247 | return ret; | |
1248 | ||
1249 | ret = -EFAULT; | |
1250 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1251 | goto out; | |
1252 | ||
1253 | ret = -EINVAL; | |
1254 | if (argv.v_size < sizeof(struct nilfs_suinfo_update)) | |
1255 | goto out; | |
1256 | ||
1257 | if (argv.v_nmembs > nilfs->ns_nsegments) | |
1258 | goto out; | |
1259 | ||
1260 | if (argv.v_nmembs >= UINT_MAX / argv.v_size) | |
1261 | goto out; | |
1262 | ||
1263 | len = argv.v_size * argv.v_nmembs; | |
1264 | if (!len) { | |
1265 | ret = 0; | |
1266 | goto out; | |
1267 | } | |
1268 | ||
1269 | base = (void __user *)(unsigned long)argv.v_base; | |
1270 | kbuf = vmalloc(len); | |
1271 | if (!kbuf) { | |
1272 | ret = -ENOMEM; | |
1273 | goto out; | |
1274 | } | |
1275 | ||
1276 | if (copy_from_user(kbuf, base, len)) { | |
1277 | ret = -EFAULT; | |
1278 | goto out_free; | |
1279 | } | |
1280 | ||
1281 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
1282 | ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size, | |
1283 | argv.v_nmembs); | |
1284 | if (unlikely(ret < 0)) | |
1285 | nilfs_transaction_abort(inode->i_sb); | |
1286 | else | |
1287 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
1288 | ||
1289 | out_free: | |
1290 | vfree(kbuf); | |
1291 | out: | |
1292 | mnt_drop_write_file(filp); | |
1293 | return ret; | |
1294 | } | |
1295 | ||
1296 | long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1297 | { | |
1298 | struct inode *inode = file_inode(filp); | |
1299 | void __user *argp = (void __user *)arg; | |
1300 | ||
1301 | switch (cmd) { | |
1302 | case FS_IOC_GETFLAGS: | |
1303 | return nilfs_ioctl_getflags(inode, argp); | |
1304 | case FS_IOC_SETFLAGS: | |
1305 | return nilfs_ioctl_setflags(inode, filp, argp); | |
1306 | case FS_IOC_GETVERSION: | |
1307 | return nilfs_ioctl_getversion(inode, argp); | |
1308 | case NILFS_IOCTL_CHANGE_CPMODE: | |
1309 | return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp); | |
1310 | case NILFS_IOCTL_DELETE_CHECKPOINT: | |
1311 | return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp); | |
1312 | case NILFS_IOCTL_GET_CPINFO: | |
1313 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, | |
1314 | sizeof(struct nilfs_cpinfo), | |
1315 | nilfs_ioctl_do_get_cpinfo); | |
1316 | case NILFS_IOCTL_GET_CPSTAT: | |
1317 | return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); | |
1318 | case NILFS_IOCTL_GET_SUINFO: | |
1319 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, | |
1320 | sizeof(struct nilfs_suinfo), | |
1321 | nilfs_ioctl_do_get_suinfo); | |
1322 | case NILFS_IOCTL_SET_SUINFO: | |
1323 | return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp); | |
1324 | case NILFS_IOCTL_GET_SUSTAT: | |
1325 | return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); | |
1326 | case NILFS_IOCTL_GET_VINFO: | |
1327 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, | |
1328 | sizeof(struct nilfs_vinfo), | |
1329 | nilfs_ioctl_do_get_vinfo); | |
1330 | case NILFS_IOCTL_GET_BDESCS: | |
1331 | return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp); | |
1332 | case NILFS_IOCTL_CLEAN_SEGMENTS: | |
1333 | return nilfs_ioctl_clean_segments(inode, filp, cmd, argp); | |
1334 | case NILFS_IOCTL_SYNC: | |
1335 | return nilfs_ioctl_sync(inode, filp, cmd, argp); | |
1336 | case NILFS_IOCTL_RESIZE: | |
1337 | return nilfs_ioctl_resize(inode, filp, argp); | |
1338 | case NILFS_IOCTL_SET_ALLOC_RANGE: | |
1339 | return nilfs_ioctl_set_alloc_range(inode, argp); | |
1340 | case FITRIM: | |
1341 | return nilfs_ioctl_trim_fs(inode, argp); | |
1342 | default: | |
1343 | return -ENOTTY; | |
1344 | } | |
1345 | } | |
1346 | ||
1347 | #ifdef CONFIG_COMPAT | |
1348 | long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1349 | { | |
1350 | switch (cmd) { | |
1351 | case FS_IOC32_GETFLAGS: | |
1352 | cmd = FS_IOC_GETFLAGS; | |
1353 | break; | |
1354 | case FS_IOC32_SETFLAGS: | |
1355 | cmd = FS_IOC_SETFLAGS; | |
1356 | break; | |
1357 | case FS_IOC32_GETVERSION: | |
1358 | cmd = FS_IOC_GETVERSION; | |
1359 | break; | |
1360 | case NILFS_IOCTL_CHANGE_CPMODE: | |
1361 | case NILFS_IOCTL_DELETE_CHECKPOINT: | |
1362 | case NILFS_IOCTL_GET_CPINFO: | |
1363 | case NILFS_IOCTL_GET_CPSTAT: | |
1364 | case NILFS_IOCTL_GET_SUINFO: | |
1365 | case NILFS_IOCTL_SET_SUINFO: | |
1366 | case NILFS_IOCTL_GET_SUSTAT: | |
1367 | case NILFS_IOCTL_GET_VINFO: | |
1368 | case NILFS_IOCTL_GET_BDESCS: | |
1369 | case NILFS_IOCTL_CLEAN_SEGMENTS: | |
1370 | case NILFS_IOCTL_SYNC: | |
1371 | case NILFS_IOCTL_RESIZE: | |
1372 | case NILFS_IOCTL_SET_ALLOC_RANGE: | |
1373 | break; | |
1374 | default: | |
1375 | return -ENOIOCTLCMD; | |
1376 | } | |
1377 | return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1378 | } | |
1379 | #endif |