1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * 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_zeroed_page(GFP_NOFS); |
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(to: buf, from: base + argv->v_size * i, |
87 | n: 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(to: base + argv->v_size * i, from: buf, |
100 | n: 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(addr: (unsigned long)buf, order: 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, flags: 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 mnt_idmap *idmap, |
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(mode: inode->i_mode, flags: 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_set_ctime_current(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(file: filp); |
199 | if (ret) |
200 | return ret; |
201 | |
202 | ret = -EFAULT; |
203 | if (copy_from_user(to: &cpmode, from: argp, n: 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(lock: &nilfs->ns_snapshot_mount_mutex); |
217 | out: |
218 | mnt_drop_write_file(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(file: filp); |
254 | if (ret) |
255 | return ret; |
256 | |
257 | ret = -EFAULT; |
258 | if (copy_from_user(to: &cno, from: argp, n: 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(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(sem: &nilfs->ns_segctor_sem); |
294 | ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, |
295 | size, nmembs); |
296 | up_read(sem: &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(sem: &nilfs->ns_segctor_sem); |
329 | ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); |
330 | up_read(sem: &nilfs->ns_segctor_sem); |
331 | if (ret < 0) |
332 | return ret; |
333 | |
334 | if (copy_to_user(to: argp, from: &cpstat, n: 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(sem: &nilfs->ns_segctor_sem); |
361 | ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, |
362 | nmembs); |
363 | up_read(sem: &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(sem: &nilfs->ns_segctor_sem); |
396 | ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); |
397 | up_read(sem: &nilfs->ns_segctor_sem); |
398 | if (ret < 0) |
399 | return ret; |
400 | |
401 | if (copy_to_user(to: argp, from: &sustat, n: 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(sem: &nilfs->ns_segctor_sem); |
428 | ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs); |
429 | up_read(sem: &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(inode: nilfs->ns_dat)->i_bmap; |
453 | struct nilfs_bdesc *bdescs = buf; |
454 | int ret, i; |
455 | |
456 | down_read(sem: &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(sem: &nilfs->ns_segctor_sem); |
465 | return ret; |
466 | } |
467 | bdescs[i].bd_blocknr = 0; |
468 | } |
469 | } |
470 | up_read(sem: &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(to: &argv, from: argp, n: 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: &argv, _IOC_DIR(cmd), |
511 | dofunc: nilfs_ioctl_do_get_bdescs); |
512 | if (ret < 0) |
513 | return ret; |
514 | |
515 | if (copy_to_user(to: argp, from: &argv, n: 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(new: &bh->b_assoc_buffers, head: 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(ptr: inode)) { |
614 | ret = PTR_ERR(ptr: inode); |
615 | goto failed; |
616 | } |
617 | if (list_empty(head: &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(new: &NILFS_I(inode)->i_dirty, |
625 | head: &nilfs->ns_gc_inodes); |
626 | } |
627 | |
628 | do { |
629 | ret = nilfs_ioctl_move_inode_block(inode, vdesc, |
630 | buffers: &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(entry: &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(entry: &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(inode: 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(inode: 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: &argv[1], buf: 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: &argv[2], buf: 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: &argv[3], buf: 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(file: filp); |
864 | if (ret) |
865 | return ret; |
866 | |
867 | ret = -EFAULT; |
868 | if (copy_from_user(to: argv, from: argp, n: 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(ptr: kbufs[4])) { |
886 | ret = PTR_ERR(ptr: 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(size: len); |
910 | if (!kbufs[n]) { |
911 | ret = -ENOMEM; |
912 | goto out_free; |
913 | } |
914 | if (copy_from_user(to: kbufs[n], from: base, n: len)) { |
915 | ret = -EFAULT; |
916 | vfree(addr: 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(nr: THE_NILFS_GC_RUNNING, addr: &nilfs->ns_flags)) { |
928 | ret = -EBUSY; |
929 | goto out_free; |
930 | } |
931 | |
932 | ret = nilfs_ioctl_move_blocks(sb: inode->i_sb, argv: &argv[0], buf: 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(addr: kbufs[n]); |
949 | kfree(objp: kbufs[4]); |
950 | out: |
951 | mnt_drop_write_file(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(sem: &nilfs->ns_segctor_sem); |
1000 | cno = nilfs->ns_cno - 1; |
1001 | up_read(sem: &nilfs->ns_segctor_sem); |
1002 | if (copy_to_user(to: argp, from: &cno, n: 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(file: filp); |
1026 | if (ret) |
1027 | goto out; |
1028 | |
1029 | ret = -EFAULT; |
1030 | if (copy_from_user(to: &newsize, from: argp, n: sizeof(newsize))) |
1031 | goto out_drop_write; |
1032 | |
1033 | ret = nilfs_resize_fs(sb: inode->i_sb, newsize); |
1034 | |
1035 | out_drop_write: |
1036 | mnt_drop_write_file(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 fstrim_range range; |
1056 | int ret; |
1057 | |
1058 | if (!capable(CAP_SYS_ADMIN)) |
1059 | return -EPERM; |
1060 | |
1061 | if (!bdev_max_discard_sectors(bdev: nilfs->ns_bdev)) |
1062 | return -EOPNOTSUPP; |
1063 | |
1064 | if (copy_from_user(to: &range, from: argp, n: sizeof(range))) |
1065 | return -EFAULT; |
1066 | |
1067 | range.minlen = max_t(u64, range.minlen, |
1068 | bdev_discard_granularity(nilfs->ns_bdev)); |
1069 | |
1070 | down_read(sem: &nilfs->ns_segctor_sem); |
1071 | ret = nilfs_sufile_trim_fs(sufile: nilfs->ns_sufile, range: &range); |
1072 | up_read(sem: &nilfs->ns_segctor_sem); |
1073 | |
1074 | if (ret < 0) |
1075 | return ret; |
1076 | |
1077 | if (copy_to_user(to: argp, from: &range, n: 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(to: range, from: argp, n: sizeof(__u64[2]))) |
1107 | goto out; |
1108 | |
1109 | ret = -ERANGE; |
1110 | if (range[1] > bdev_nr_bytes(bdev: inode->i_sb->s_bdev)) |
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 | |
1118 | if (range[1] < 4096) |
1119 | goto out; |
1120 | |
1121 | maxseg = NILFS_SB2_OFFSET_BYTES(range[1]); |
1122 | if (maxseg < segbytes) |
1123 | goto out; |
1124 | |
1125 | do_div(maxseg, segbytes); |
1126 | maxseg--; |
1127 | |
1128 | ret = nilfs_sufile_set_alloc_range(sufile: nilfs->ns_sufile, start: minseg, end: maxseg); |
1129 | out: |
1130 | return ret; |
1131 | } |
1132 | |
1133 | /** |
1134 | * nilfs_ioctl_get_info - wrapping function of get metadata info |
1135 | * @inode: inode object |
1136 | * @filp: file object |
1137 | * @cmd: ioctl's request code |
1138 | * @argp: pointer on argument from userspace |
1139 | * @membsz: size of an item in bytes |
1140 | * @dofunc: concrete function of getting metadata info |
1141 | * |
1142 | * Description: nilfs_ioctl_get_info() gets metadata info by means of |
1143 | * calling dofunc() function. |
1144 | * |
1145 | * Return Value: On success, 0 is returned and requested metadata info |
1146 | * is copied into userspace. On error, one of the following |
1147 | * negative error codes is returned. |
1148 | * |
1149 | * %-EINVAL - Invalid arguments from userspace. |
1150 | * |
1151 | * %-ENOMEM - Insufficient amount of memory available. |
1152 | * |
1153 | * %-EFAULT - Failure during execution of requested operation. |
1154 | */ |
1155 | static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, |
1156 | unsigned int cmd, void __user *argp, |
1157 | size_t membsz, |
1158 | ssize_t (*dofunc)(struct the_nilfs *, |
1159 | __u64 *, int, |
1160 | void *, size_t, size_t)) |
1161 | |
1162 | { |
1163 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
1164 | struct nilfs_argv argv; |
1165 | int ret; |
1166 | |
1167 | if (copy_from_user(to: &argv, from: argp, n: sizeof(argv))) |
1168 | return -EFAULT; |
1169 | |
1170 | if (argv.v_size < membsz) |
1171 | return -EINVAL; |
1172 | |
1173 | ret = nilfs_ioctl_wrap_copy(nilfs, argv: &argv, _IOC_DIR(cmd), dofunc); |
1174 | if (ret < 0) |
1175 | return ret; |
1176 | |
1177 | if (copy_to_user(to: argp, from: &argv, n: sizeof(argv))) |
1178 | ret = -EFAULT; |
1179 | return ret; |
1180 | } |
1181 | |
1182 | /** |
1183 | * nilfs_ioctl_set_suinfo - set segment usage info |
1184 | * @inode: inode object |
1185 | * @filp: file object |
1186 | * @cmd: ioctl's request code |
1187 | * @argp: pointer on argument from userspace |
1188 | * |
1189 | * Description: Expects an array of nilfs_suinfo_update structures |
1190 | * encapsulated in nilfs_argv and updates the segment usage info |
1191 | * according to the flags in nilfs_suinfo_update. |
1192 | * |
1193 | * Return Value: On success, 0 is returned. On error, one of the |
1194 | * following negative error codes is returned. |
1195 | * |
1196 | * %-EPERM - Not enough permissions |
1197 | * |
1198 | * %-EFAULT - Error copying input data |
1199 | * |
1200 | * %-EIO - I/O error. |
1201 | * |
1202 | * %-ENOMEM - Insufficient amount of memory available. |
1203 | * |
1204 | * %-EINVAL - Invalid values in input (segment number, flags or nblocks) |
1205 | */ |
1206 | static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp, |
1207 | unsigned int cmd, void __user *argp) |
1208 | { |
1209 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
1210 | struct nilfs_transaction_info ti; |
1211 | struct nilfs_argv argv; |
1212 | size_t len; |
1213 | void __user *base; |
1214 | void *kbuf; |
1215 | int ret; |
1216 | |
1217 | if (!capable(CAP_SYS_ADMIN)) |
1218 | return -EPERM; |
1219 | |
1220 | ret = mnt_want_write_file(file: filp); |
1221 | if (ret) |
1222 | return ret; |
1223 | |
1224 | ret = -EFAULT; |
1225 | if (copy_from_user(to: &argv, from: argp, n: sizeof(argv))) |
1226 | goto out; |
1227 | |
1228 | ret = -EINVAL; |
1229 | if (argv.v_size < sizeof(struct nilfs_suinfo_update)) |
1230 | goto out; |
1231 | |
1232 | if (argv.v_nmembs > nilfs->ns_nsegments) |
1233 | goto out; |
1234 | |
1235 | if (argv.v_nmembs >= UINT_MAX / argv.v_size) |
1236 | goto out; |
1237 | |
1238 | len = argv.v_size * argv.v_nmembs; |
1239 | if (!len) { |
1240 | ret = 0; |
1241 | goto out; |
1242 | } |
1243 | |
1244 | base = (void __user *)(unsigned long)argv.v_base; |
1245 | kbuf = vmalloc(size: len); |
1246 | if (!kbuf) { |
1247 | ret = -ENOMEM; |
1248 | goto out; |
1249 | } |
1250 | |
1251 | if (copy_from_user(to: kbuf, from: base, n: len)) { |
1252 | ret = -EFAULT; |
1253 | goto out_free; |
1254 | } |
1255 | |
1256 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
1257 | ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size, |
1258 | argv.v_nmembs); |
1259 | if (unlikely(ret < 0)) |
1260 | nilfs_transaction_abort(inode->i_sb); |
1261 | else |
1262 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
1263 | |
1264 | out_free: |
1265 | vfree(addr: kbuf); |
1266 | out: |
1267 | mnt_drop_write_file(file: filp); |
1268 | return ret; |
1269 | } |
1270 | |
1271 | long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1272 | { |
1273 | struct inode *inode = file_inode(f: filp); |
1274 | void __user *argp = (void __user *)arg; |
1275 | |
1276 | switch (cmd) { |
1277 | case FS_IOC_GETVERSION: |
1278 | return nilfs_ioctl_getversion(inode, argp); |
1279 | case NILFS_IOCTL_CHANGE_CPMODE: |
1280 | return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp); |
1281 | case NILFS_IOCTL_DELETE_CHECKPOINT: |
1282 | return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp); |
1283 | case NILFS_IOCTL_GET_CPINFO: |
1284 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
1285 | membsz: sizeof(struct nilfs_cpinfo), |
1286 | dofunc: nilfs_ioctl_do_get_cpinfo); |
1287 | case NILFS_IOCTL_GET_CPSTAT: |
1288 | return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); |
1289 | case NILFS_IOCTL_GET_SUINFO: |
1290 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
1291 | membsz: sizeof(struct nilfs_suinfo), |
1292 | dofunc: nilfs_ioctl_do_get_suinfo); |
1293 | case NILFS_IOCTL_SET_SUINFO: |
1294 | return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp); |
1295 | case NILFS_IOCTL_GET_SUSTAT: |
1296 | return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); |
1297 | case NILFS_IOCTL_GET_VINFO: |
1298 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
1299 | membsz: sizeof(struct nilfs_vinfo), |
1300 | dofunc: nilfs_ioctl_do_get_vinfo); |
1301 | case NILFS_IOCTL_GET_BDESCS: |
1302 | return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp); |
1303 | case NILFS_IOCTL_CLEAN_SEGMENTS: |
1304 | return nilfs_ioctl_clean_segments(inode, filp, cmd, argp); |
1305 | case NILFS_IOCTL_SYNC: |
1306 | return nilfs_ioctl_sync(inode, filp, cmd, argp); |
1307 | case NILFS_IOCTL_RESIZE: |
1308 | return nilfs_ioctl_resize(inode, filp, argp); |
1309 | case NILFS_IOCTL_SET_ALLOC_RANGE: |
1310 | return nilfs_ioctl_set_alloc_range(inode, argp); |
1311 | case FITRIM: |
1312 | return nilfs_ioctl_trim_fs(inode, argp); |
1313 | default: |
1314 | return -ENOTTY; |
1315 | } |
1316 | } |
1317 | |
1318 | #ifdef CONFIG_COMPAT |
1319 | long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1320 | { |
1321 | switch (cmd) { |
1322 | case FS_IOC32_GETVERSION: |
1323 | cmd = FS_IOC_GETVERSION; |
1324 | break; |
1325 | case NILFS_IOCTL_CHANGE_CPMODE: |
1326 | case NILFS_IOCTL_DELETE_CHECKPOINT: |
1327 | case NILFS_IOCTL_GET_CPINFO: |
1328 | case NILFS_IOCTL_GET_CPSTAT: |
1329 | case NILFS_IOCTL_GET_SUINFO: |
1330 | case NILFS_IOCTL_SET_SUINFO: |
1331 | case NILFS_IOCTL_GET_SUSTAT: |
1332 | case NILFS_IOCTL_GET_VINFO: |
1333 | case NILFS_IOCTL_GET_BDESCS: |
1334 | case NILFS_IOCTL_CLEAN_SEGMENTS: |
1335 | case NILFS_IOCTL_SYNC: |
1336 | case NILFS_IOCTL_RESIZE: |
1337 | case NILFS_IOCTL_SET_ALLOC_RANGE: |
1338 | case FITRIM: |
1339 | break; |
1340 | default: |
1341 | return -ENOIOCTLCMD; |
1342 | } |
1343 | return nilfs_ioctl(filp, cmd, arg: (unsigned long)compat_ptr(uptr: arg)); |
1344 | } |
1345 | #endif |
1346 | |