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