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ae98043f | 1 | // SPDX-License-Identifier: GPL-2.0+ |
7942b919 KS |
2 | /* |
3 | * ioctl.c - NILFS ioctl operations. | |
4 | * | |
5 | * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
4b420ab4 | 7 | * Written by Koji Sato. |
7942b919 KS |
8 | */ |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/wait.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
7942b919 KS |
13 | #include <linux/capability.h> /* capable() */ |
14 | #include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */ | |
4f6b8288 | 15 | #include <linux/vmalloc.h> |
828b1c50 | 16 | #include <linux/compat.h> /* compat_ptr() */ |
2a79f17e | 17 | #include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */ |
ae191838 | 18 | #include <linux/buffer_head.h> |
7942b919 KS |
19 | #include "nilfs.h" |
20 | #include "segment.h" | |
21 | #include "bmap.h" | |
22 | #include "cpfile.h" | |
23 | #include "sufile.h" | |
24 | #include "dat.h" | |
25 | ||
d623a942 VD |
26 | /** |
27 | * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info | |
28 | * @nilfs: nilfs object | |
29 | * @argv: vector of arguments from userspace | |
30 | * @dir: set of direction flags | |
31 | * @dofunc: concrete function of get/set metadata info | |
32 | * | |
33 | * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of | |
34 | * calling dofunc() function on the basis of @argv argument. | |
35 | * | |
36 | * Return Value: On success, 0 is returned and requested metadata info | |
37 | * is copied into userspace. On error, one of the following | |
38 | * negative error codes is returned. | |
39 | * | |
40 | * %-EINVAL - Invalid arguments from userspace. | |
41 | * | |
42 | * %-ENOMEM - Insufficient amount of memory available. | |
43 | * | |
44 | * %-EFAULT - Failure during execution of requested operation. | |
45 | */ | |
7942b919 KS |
46 | static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs, |
47 | struct nilfs_argv *argv, int dir, | |
48 | ssize_t (*dofunc)(struct the_nilfs *, | |
b028fcfc | 49 | __u64 *, int, |
7942b919 KS |
50 | void *, size_t, size_t)) |
51 | { | |
52 | void *buf; | |
dc498d09 | 53 | void __user *base = (void __user *)(unsigned long)argv->v_base; |
3358b4aa | 54 | size_t maxmembs, total, n; |
7942b919 KS |
55 | ssize_t nr; |
56 | int ret, i; | |
b028fcfc | 57 | __u64 pos, ppos; |
7942b919 KS |
58 | |
59 | if (argv->v_nmembs == 0) | |
60 | return 0; | |
61 | ||
3358b4aa RK |
62 | if (argv->v_size > PAGE_SIZE) |
63 | return -EINVAL; | |
64 | ||
4b15d617 WF |
65 | /* |
66 | * Reject pairs of a start item position (argv->v_index) and a | |
67 | * total count (argv->v_nmembs) which leads position 'pos' to | |
68 | * overflow by the increment at the end of the loop. | |
69 | */ | |
70 | if (argv->v_index > ~(__u64)0 - argv->v_nmembs) | |
71 | return -EINVAL; | |
72 | ||
3358b4aa RK |
73 | buf = (void *)__get_free_pages(GFP_NOFS, 0); |
74 | if (unlikely(!buf)) | |
7942b919 | 75 | return -ENOMEM; |
3358b4aa | 76 | maxmembs = PAGE_SIZE / argv->v_size; |
7942b919 KS |
77 | |
78 | ret = 0; | |
79 | total = 0; | |
b028fcfc | 80 | pos = argv->v_index; |
7942b919 KS |
81 | for (i = 0; i < argv->v_nmembs; i += n) { |
82 | n = (argv->v_nmembs - i < maxmembs) ? | |
83 | argv->v_nmembs - i : maxmembs; | |
84 | if ((dir & _IOC_WRITE) && | |
dc498d09 RK |
85 | copy_from_user(buf, base + argv->v_size * i, |
86 | argv->v_size * n)) { | |
7942b919 KS |
87 | ret = -EFAULT; |
88 | break; | |
89 | } | |
b028fcfc | 90 | ppos = pos; |
8acfbf09 | 91 | nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size, |
b028fcfc | 92 | n); |
7942b919 KS |
93 | if (nr < 0) { |
94 | ret = nr; | |
95 | break; | |
96 | } | |
97 | if ((dir & _IOC_READ) && | |
dc498d09 RK |
98 | copy_to_user(base + argv->v_size * i, buf, |
99 | argv->v_size * nr)) { | |
7942b919 KS |
100 | ret = -EFAULT; |
101 | break; | |
102 | } | |
103 | total += nr; | |
b028fcfc RK |
104 | if ((size_t)nr < n) |
105 | break; | |
106 | if (pos == ppos) | |
107 | pos += n; | |
7942b919 KS |
108 | } |
109 | argv->v_nmembs = total; | |
110 | ||
3358b4aa | 111 | free_pages((unsigned long)buf, 0); |
7942b919 KS |
112 | return ret; |
113 | } | |
114 | ||
d623a942 VD |
115 | /** |
116 | * nilfs_ioctl_getflags - ioctl to support lsattr | |
117 | */ | |
cde98f0f RK |
118 | static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp) |
119 | { | |
120 | unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE; | |
121 | ||
122 | return put_user(flags, (int __user *)argp); | |
123 | } | |
124 | ||
d623a942 VD |
125 | /** |
126 | * nilfs_ioctl_setflags - ioctl to support chattr | |
127 | */ | |
cde98f0f RK |
128 | static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp, |
129 | void __user *argp) | |
130 | { | |
131 | struct nilfs_transaction_info ti; | |
132 | unsigned int flags, oldflags; | |
133 | int ret; | |
134 | ||
2e149670 | 135 | if (!inode_owner_or_capable(inode)) |
cde98f0f RK |
136 | return -EACCES; |
137 | ||
138 | if (get_user(flags, (int __user *)argp)) | |
139 | return -EFAULT; | |
140 | ||
a561be71 | 141 | ret = mnt_want_write_file(filp); |
cde98f0f RK |
142 | if (ret) |
143 | return ret; | |
144 | ||
145 | flags = nilfs_mask_flags(inode->i_mode, flags); | |
146 | ||
5955102c | 147 | inode_lock(inode); |
cde98f0f RK |
148 | |
149 | oldflags = NILFS_I(inode)->i_flags; | |
150 | ||
5aca2842 DW |
151 | ret = vfs_ioc_setflags_prepare(inode, oldflags, flags); |
152 | if (ret) | |
cde98f0f RK |
153 | goto out; |
154 | ||
155 | ret = nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
156 | if (ret) | |
157 | goto out; | |
158 | ||
159 | NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) | | |
160 | (flags & FS_FL_USER_MODIFIABLE); | |
161 | ||
162 | nilfs_set_inode_flags(inode); | |
078cd827 | 163 | inode->i_ctime = current_time(inode); |
cde98f0f RK |
164 | if (IS_SYNC(inode)) |
165 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
166 | ||
167 | nilfs_mark_inode_dirty(inode); | |
168 | ret = nilfs_transaction_commit(inode->i_sb); | |
169 | out: | |
5955102c | 170 | inode_unlock(inode); |
2a79f17e | 171 | mnt_drop_write_file(filp); |
cde98f0f RK |
172 | return ret; |
173 | } | |
174 | ||
d623a942 VD |
175 | /** |
176 | * nilfs_ioctl_getversion - get info about a file's version (generation number) | |
177 | */ | |
cde98f0f RK |
178 | static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp) |
179 | { | |
180 | return put_user(inode->i_generation, (int __user *)argp); | |
181 | } | |
182 | ||
d623a942 VD |
183 | /** |
184 | * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot) | |
185 | * @inode: inode object | |
186 | * @filp: file object | |
187 | * @cmd: ioctl's request code | |
188 | * @argp: pointer on argument from userspace | |
189 | * | |
190 | * Description: nilfs_ioctl_change_cpmode() function changes mode of | |
191 | * given checkpoint between checkpoint and snapshot state. This ioctl | |
192 | * is used in chcp and mkcp utilities. | |
193 | * | |
194 | * Return Value: On success, 0 is returned and mode of a checkpoint is | |
195 | * changed. On error, one of the following negative error codes | |
196 | * is returned. | |
197 | * | |
198 | * %-EPERM - Operation not permitted. | |
199 | * | |
200 | * %-EFAULT - Failure during checkpoint mode changing. | |
201 | */ | |
7942b919 KS |
202 | static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp, |
203 | unsigned int cmd, void __user *argp) | |
204 | { | |
e3154e97 | 205 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 KS |
206 | struct nilfs_transaction_info ti; |
207 | struct nilfs_cpmode cpmode; | |
208 | int ret; | |
209 | ||
210 | if (!capable(CAP_SYS_ADMIN)) | |
211 | return -EPERM; | |
7512487e | 212 | |
a561be71 | 213 | ret = mnt_want_write_file(filp); |
7512487e RK |
214 | if (ret) |
215 | return ret; | |
216 | ||
217 | ret = -EFAULT; | |
7942b919 | 218 | if (copy_from_user(&cpmode, argp, sizeof(cpmode))) |
7512487e | 219 | goto out; |
7942b919 | 220 | |
572d8b39 | 221 | mutex_lock(&nilfs->ns_snapshot_mount_mutex); |
7512487e | 222 | |
7942b919 KS |
223 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
224 | ret = nilfs_cpfile_change_cpmode( | |
e3154e97 | 225 | nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode); |
7512487e | 226 | if (unlikely(ret < 0)) |
47420c79 | 227 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
228 | else |
229 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
230 | ||
572d8b39 | 231 | mutex_unlock(&nilfs->ns_snapshot_mount_mutex); |
7512487e | 232 | out: |
2a79f17e | 233 | mnt_drop_write_file(filp); |
7942b919 KS |
234 | return ret; |
235 | } | |
236 | ||
d623a942 VD |
237 | /** |
238 | * nilfs_ioctl_delete_checkpoint - remove checkpoint | |
239 | * @inode: inode object | |
240 | * @filp: file object | |
241 | * @cmd: ioctl's request code | |
242 | * @argp: pointer on argument from userspace | |
243 | * | |
244 | * Description: nilfs_ioctl_delete_checkpoint() function removes | |
245 | * checkpoint from NILFS2 file system. This ioctl is used in rmcp | |
246 | * utility. | |
247 | * | |
248 | * Return Value: On success, 0 is returned and a checkpoint is | |
249 | * removed. On error, one of the following negative error codes | |
250 | * is returned. | |
251 | * | |
252 | * %-EPERM - Operation not permitted. | |
253 | * | |
254 | * %-EFAULT - Failure during checkpoint removing. | |
255 | */ | |
7942b919 KS |
256 | static int |
257 | nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp, | |
258 | unsigned int cmd, void __user *argp) | |
259 | { | |
e3154e97 | 260 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 KS |
261 | struct nilfs_transaction_info ti; |
262 | __u64 cno; | |
263 | int ret; | |
264 | ||
265 | if (!capable(CAP_SYS_ADMIN)) | |
266 | return -EPERM; | |
7512487e | 267 | |
a561be71 | 268 | ret = mnt_want_write_file(filp); |
7512487e RK |
269 | if (ret) |
270 | return ret; | |
271 | ||
272 | ret = -EFAULT; | |
7942b919 | 273 | if (copy_from_user(&cno, argp, sizeof(cno))) |
7512487e | 274 | goto out; |
7942b919 KS |
275 | |
276 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
e3154e97 | 277 | ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno); |
7512487e | 278 | if (unlikely(ret < 0)) |
47420c79 | 279 | nilfs_transaction_abort(inode->i_sb); |
7512487e RK |
280 | else |
281 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
282 | out: | |
2a79f17e | 283 | mnt_drop_write_file(filp); |
7942b919 KS |
284 | return ret; |
285 | } | |
286 | ||
d623a942 VD |
287 | /** |
288 | * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints | |
289 | * @nilfs: nilfs object | |
290 | * @posp: pointer on array of checkpoint's numbers | |
291 | * @flags: checkpoint mode (checkpoint or snapshot) | |
292 | * @buf: buffer for storing checkponts' info | |
293 | * @size: size in bytes of one checkpoint info item in array | |
294 | * @nmembs: number of checkpoints in array (numbers and infos) | |
295 | * | |
296 | * Description: nilfs_ioctl_do_get_cpinfo() function returns info about | |
297 | * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in | |
298 | * lscp utility and by nilfs_cleanerd daemon. | |
299 | * | |
300 | * Return value: count of nilfs_cpinfo structures in output buffer. | |
301 | */ | |
7942b919 | 302 | static ssize_t |
b028fcfc | 303 | nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
304 | void *buf, size_t size, size_t nmembs) |
305 | { | |
7942b919 KS |
306 | int ret; |
307 | ||
47420c79 | 308 | down_read(&nilfs->ns_segctor_sem); |
47eb6b9c | 309 | ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf, |
003ff182 | 310 | size, nmembs); |
47420c79 | 311 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
312 | return ret; |
313 | } | |
314 | ||
d623a942 VD |
315 | /** |
316 | * nilfs_ioctl_get_cpstat - get checkpoints statistics | |
317 | * @inode: inode object | |
318 | * @filp: file object | |
319 | * @cmd: ioctl's request code | |
320 | * @argp: pointer on argument from userspace | |
321 | * | |
322 | * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints. | |
323 | * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities | |
324 | * and by nilfs_cleanerd daemon. | |
325 | * | |
326 | * Return Value: On success, 0 is returned, and checkpoints information is | |
327 | * copied into userspace pointer @argp. On error, one of the following | |
328 | * negative error codes is returned. | |
329 | * | |
330 | * %-EIO - I/O error. | |
331 | * | |
332 | * %-ENOMEM - Insufficient amount of memory available. | |
333 | * | |
334 | * %-EFAULT - Failure during getting checkpoints statistics. | |
335 | */ | |
7942b919 KS |
336 | static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp, |
337 | unsigned int cmd, void __user *argp) | |
338 | { | |
e3154e97 | 339 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 340 | struct nilfs_cpstat cpstat; |
7942b919 KS |
341 | int ret; |
342 | ||
47420c79 RK |
343 | down_read(&nilfs->ns_segctor_sem); |
344 | ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); | |
345 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
346 | if (ret < 0) |
347 | return ret; | |
348 | ||
349 | if (copy_to_user(argp, &cpstat, sizeof(cpstat))) | |
350 | ret = -EFAULT; | |
351 | return ret; | |
352 | } | |
353 | ||
d623a942 VD |
354 | /** |
355 | * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info | |
356 | * @nilfs: nilfs object | |
357 | * @posp: pointer on array of segment numbers | |
358 | * @flags: *not used* | |
359 | * @buf: buffer for storing suinfo array | |
360 | * @size: size in bytes of one suinfo item in array | |
361 | * @nmembs: count of segment numbers and suinfos in array | |
362 | * | |
363 | * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage | |
364 | * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used | |
365 | * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon. | |
366 | * | |
367 | * Return value: count of nilfs_suinfo structures in output buffer. | |
368 | */ | |
7942b919 | 369 | static ssize_t |
b028fcfc | 370 | nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
371 | void *buf, size_t size, size_t nmembs) |
372 | { | |
7942b919 KS |
373 | int ret; |
374 | ||
47420c79 | 375 | down_read(&nilfs->ns_segctor_sem); |
003ff182 RK |
376 | ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size, |
377 | nmembs); | |
47420c79 | 378 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
379 | return ret; |
380 | } | |
381 | ||
d623a942 VD |
382 | /** |
383 | * nilfs_ioctl_get_sustat - get segment usage statistics | |
384 | * @inode: inode object | |
385 | * @filp: file object | |
386 | * @cmd: ioctl's request code | |
387 | * @argp: pointer on argument from userspace | |
388 | * | |
389 | * Description: nilfs_ioctl_get_sustat() returns segment usage statistics. | |
390 | * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities | |
391 | * and by nilfs_cleanerd daemon. | |
392 | * | |
393 | * Return Value: On success, 0 is returned, and segment usage information is | |
394 | * copied into userspace pointer @argp. On error, one of the following | |
395 | * negative error codes is returned. | |
396 | * | |
397 | * %-EIO - I/O error. | |
398 | * | |
399 | * %-ENOMEM - Insufficient amount of memory available. | |
400 | * | |
401 | * %-EFAULT - Failure during getting segment usage statistics. | |
402 | */ | |
7942b919 KS |
403 | static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp, |
404 | unsigned int cmd, void __user *argp) | |
405 | { | |
e3154e97 | 406 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 407 | struct nilfs_sustat sustat; |
7942b919 KS |
408 | int ret; |
409 | ||
47420c79 RK |
410 | down_read(&nilfs->ns_segctor_sem); |
411 | ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat); | |
412 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
413 | if (ret < 0) |
414 | return ret; | |
415 | ||
416 | if (copy_to_user(argp, &sustat, sizeof(sustat))) | |
417 | ret = -EFAULT; | |
418 | return ret; | |
419 | } | |
420 | ||
d623a942 VD |
421 | /** |
422 | * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info | |
423 | * @nilfs: nilfs object | |
424 | * @posp: *not used* | |
425 | * @flags: *not used* | |
426 | * @buf: buffer for storing array of nilfs_vinfo structures | |
427 | * @size: size in bytes of one vinfo item in array | |
428 | * @nmembs: count of vinfos in array | |
429 | * | |
430 | * Description: nilfs_ioctl_do_get_vinfo() function returns information | |
431 | * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used | |
432 | * by nilfs_cleanerd daemon. | |
433 | * | |
434 | * Return value: count of nilfs_vinfo structures in output buffer. | |
435 | */ | |
7942b919 | 436 | static ssize_t |
b028fcfc | 437 | nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
438 | void *buf, size_t size, size_t nmembs) |
439 | { | |
7942b919 KS |
440 | int ret; |
441 | ||
47420c79 | 442 | down_read(&nilfs->ns_segctor_sem); |
365e215c | 443 | ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs); |
47420c79 | 444 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
445 | return ret; |
446 | } | |
447 | ||
d623a942 VD |
448 | /** |
449 | * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors | |
450 | * @nilfs: nilfs object | |
451 | * @posp: *not used* | |
452 | * @flags: *not used* | |
453 | * @buf: buffer for storing array of nilfs_bdesc structures | |
454 | * @size: size in bytes of one bdesc item in array | |
455 | * @nmembs: count of bdescs in array | |
456 | * | |
457 | * Description: nilfs_ioctl_do_get_bdescs() function returns information | |
458 | * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl | |
459 | * is used by nilfs_cleanerd daemon. | |
460 | * | |
461 | * Return value: count of nilfs_bdescs structures in output buffer. | |
462 | */ | |
7942b919 | 463 | static ssize_t |
b028fcfc | 464 | nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags, |
7942b919 KS |
465 | void *buf, size_t size, size_t nmembs) |
466 | { | |
365e215c | 467 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
7942b919 KS |
468 | struct nilfs_bdesc *bdescs = buf; |
469 | int ret, i; | |
470 | ||
47eb6b9c | 471 | down_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
472 | for (i = 0; i < nmembs; i++) { |
473 | ret = nilfs_bmap_lookup_at_level(bmap, | |
474 | bdescs[i].bd_offset, | |
475 | bdescs[i].bd_level + 1, | |
476 | &bdescs[i].bd_blocknr); | |
477 | if (ret < 0) { | |
47eb6b9c RK |
478 | if (ret != -ENOENT) { |
479 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 | 480 | return ret; |
47eb6b9c | 481 | } |
7942b919 KS |
482 | bdescs[i].bd_blocknr = 0; |
483 | } | |
484 | } | |
47eb6b9c | 485 | up_read(&nilfs->ns_segctor_sem); |
7942b919 KS |
486 | return nmembs; |
487 | } | |
488 | ||
d623a942 VD |
489 | /** |
490 | * nilfs_ioctl_get_bdescs - get disk block descriptors | |
491 | * @inode: inode object | |
492 | * @filp: file object | |
493 | * @cmd: ioctl's request code | |
494 | * @argp: pointer on argument from userspace | |
495 | * | |
496 | * Description: nilfs_ioctl_do_get_bdescs() function returns information | |
497 | * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl | |
498 | * is used by nilfs_cleanerd daemon. | |
499 | * | |
500 | * Return Value: On success, 0 is returned, and disk block descriptors are | |
501 | * copied into userspace pointer @argp. On error, one of the following | |
502 | * negative error codes is returned. | |
503 | * | |
504 | * %-EINVAL - Invalid arguments from userspace. | |
505 | * | |
506 | * %-EIO - I/O error. | |
507 | * | |
508 | * %-ENOMEM - Insufficient amount of memory available. | |
509 | * | |
510 | * %-EFAULT - Failure during getting disk block descriptors. | |
511 | */ | |
7942b919 KS |
512 | static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp, |
513 | unsigned int cmd, void __user *argp) | |
514 | { | |
e3154e97 | 515 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
7942b919 | 516 | struct nilfs_argv argv; |
7942b919 KS |
517 | int ret; |
518 | ||
519 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
520 | return -EFAULT; | |
521 | ||
83aca8f4 RK |
522 | if (argv.v_size != sizeof(struct nilfs_bdesc)) |
523 | return -EINVAL; | |
524 | ||
7942b919 KS |
525 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), |
526 | nilfs_ioctl_do_get_bdescs); | |
47420c79 RK |
527 | if (ret < 0) |
528 | return ret; | |
7942b919 KS |
529 | |
530 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
531 | ret = -EFAULT; | |
532 | return ret; | |
533 | } | |
534 | ||
d623a942 VD |
535 | /** |
536 | * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC | |
537 | * @inode: inode object | |
538 | * @vdesc: descriptor of virtual block number | |
539 | * @buffers: list of moving buffers | |
540 | * | |
541 | * Description: nilfs_ioctl_move_inode_block() function registers data/node | |
542 | * buffer in the GC pagecache and submit read request. | |
543 | * | |
544 | * Return Value: On success, 0 is returned. On error, one of the following | |
545 | * negative error codes is returned. | |
546 | * | |
547 | * %-EIO - I/O error. | |
548 | * | |
549 | * %-ENOMEM - Insufficient amount of memory available. | |
550 | * | |
551 | * %-ENOENT - Requested block doesn't exist. | |
552 | * | |
553 | * %-EEXIST - Blocks conflict is detected. | |
554 | */ | |
7942b919 KS |
555 | static int nilfs_ioctl_move_inode_block(struct inode *inode, |
556 | struct nilfs_vdesc *vdesc, | |
557 | struct list_head *buffers) | |
558 | { | |
559 | struct buffer_head *bh; | |
560 | int ret; | |
561 | ||
562 | if (vdesc->vd_flags == 0) | |
563 | ret = nilfs_gccache_submit_read_data( | |
564 | inode, vdesc->vd_offset, vdesc->vd_blocknr, | |
565 | vdesc->vd_vblocknr, &bh); | |
566 | else | |
567 | ret = nilfs_gccache_submit_read_node( | |
568 | inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh); | |
569 | ||
570 | if (unlikely(ret < 0)) { | |
571 | if (ret == -ENOENT) | |
feee880f RK |
572 | nilfs_msg(inode->i_sb, KERN_CRIT, |
573 | "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu", | |
574 | __func__, vdesc->vd_flags ? "node" : "data", | |
575 | (unsigned long long)vdesc->vd_ino, | |
576 | (unsigned long long)vdesc->vd_cno, | |
577 | (unsigned long long)vdesc->vd_offset, | |
578 | (unsigned long long)vdesc->vd_blocknr, | |
579 | (unsigned long long)vdesc->vd_vblocknr); | |
7942b919 KS |
580 | return ret; |
581 | } | |
5399dd1f | 582 | if (unlikely(!list_empty(&bh->b_assoc_buffers))) { |
feee880f RK |
583 | nilfs_msg(inode->i_sb, KERN_CRIT, |
584 | "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu", | |
585 | __func__, vdesc->vd_flags ? "node" : "data", | |
586 | (unsigned long long)vdesc->vd_ino, | |
587 | (unsigned long long)vdesc->vd_cno, | |
588 | (unsigned long long)vdesc->vd_offset, | |
589 | (unsigned long long)vdesc->vd_blocknr, | |
590 | (unsigned long long)vdesc->vd_vblocknr); | |
5399dd1f RK |
591 | brelse(bh); |
592 | return -EEXIST; | |
593 | } | |
7942b919 KS |
594 | list_add_tail(&bh->b_assoc_buffers, buffers); |
595 | return 0; | |
596 | } | |
597 | ||
d623a942 VD |
598 | /** |
599 | * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection | |
600 | * @sb: superblock object | |
601 | * @argv: vector of arguments from userspace | |
602 | * @buf: array of nilfs_vdesc structures | |
603 | * | |
604 | * Description: nilfs_ioctl_move_blocks() function reads valid data/node | |
605 | * blocks that garbage collector specified with the array of nilfs_vdesc | |
606 | * structures and stores them into page caches of GC inodes. | |
607 | * | |
608 | * Return Value: Number of processed nilfs_vdesc structures or | |
609 | * error code, otherwise. | |
610 | */ | |
263d90ce | 611 | static int nilfs_ioctl_move_blocks(struct super_block *sb, |
4f6b8288 | 612 | struct nilfs_argv *argv, void *buf) |
7942b919 | 613 | { |
4f6b8288 | 614 | size_t nmembs = argv->v_nmembs; |
e3154e97 | 615 | struct the_nilfs *nilfs = sb->s_fs_info; |
7942b919 KS |
616 | struct inode *inode; |
617 | struct nilfs_vdesc *vdesc; | |
618 | struct buffer_head *bh, *n; | |
619 | LIST_HEAD(buffers); | |
620 | ino_t ino; | |
621 | __u64 cno; | |
622 | int i, ret; | |
623 | ||
624 | for (i = 0, vdesc = buf; i < nmembs; ) { | |
625 | ino = vdesc->vd_ino; | |
626 | cno = vdesc->vd_cno; | |
263d90ce | 627 | inode = nilfs_iget_for_gc(sb, ino, cno); |
103cfcf5 DC |
628 | if (IS_ERR(inode)) { |
629 | ret = PTR_ERR(inode); | |
7942b919 KS |
630 | goto failed; |
631 | } | |
947b10ae RK |
632 | if (list_empty(&NILFS_I(inode)->i_dirty)) { |
633 | /* | |
634 | * Add the inode to GC inode list. Garbage Collection | |
635 | * is serialized and no two processes manipulate the | |
636 | * list simultaneously. | |
637 | */ | |
638 | igrab(inode); | |
639 | list_add(&NILFS_I(inode)->i_dirty, | |
640 | &nilfs->ns_gc_inodes); | |
641 | } | |
642 | ||
7942b919 KS |
643 | do { |
644 | ret = nilfs_ioctl_move_inode_block(inode, vdesc, | |
645 | &buffers); | |
263d90ce RK |
646 | if (unlikely(ret < 0)) { |
647 | iput(inode); | |
7942b919 | 648 | goto failed; |
263d90ce | 649 | } |
7942b919 KS |
650 | vdesc++; |
651 | } while (++i < nmembs && | |
652 | vdesc->vd_ino == ino && vdesc->vd_cno == cno); | |
263d90ce RK |
653 | |
654 | iput(inode); /* The inode still remains in GC inode list */ | |
7942b919 KS |
655 | } |
656 | ||
657 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { | |
658 | ret = nilfs_gccache_wait_and_mark_dirty(bh); | |
659 | if (unlikely(ret < 0)) { | |
5399dd1f | 660 | WARN_ON(ret == -EEXIST); |
7942b919 KS |
661 | goto failed; |
662 | } | |
663 | list_del_init(&bh->b_assoc_buffers); | |
7942b919 KS |
664 | brelse(bh); |
665 | } | |
666 | return nmembs; | |
667 | ||
668 | failed: | |
669 | list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) { | |
670 | list_del_init(&bh->b_assoc_buffers); | |
7942b919 KS |
671 | brelse(bh); |
672 | } | |
673 | return ret; | |
674 | } | |
675 | ||
d623a942 VD |
676 | /** |
677 | * nilfs_ioctl_delete_checkpoints - delete checkpoints | |
678 | * @nilfs: nilfs object | |
679 | * @argv: vector of arguments from userspace | |
680 | * @buf: array of periods of checkpoints numbers | |
681 | * | |
682 | * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints | |
683 | * in the period from p_start to p_end, excluding p_end itself. The checkpoints | |
684 | * which have been already deleted are ignored. | |
685 | * | |
686 | * Return Value: Number of processed nilfs_period structures or | |
687 | * error code, otherwise. | |
688 | * | |
689 | * %-EIO - I/O error. | |
690 | * | |
691 | * %-ENOMEM - Insufficient amount of memory available. | |
692 | * | |
693 | * %-EINVAL - invalid checkpoints. | |
694 | */ | |
4f6b8288 RK |
695 | static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs, |
696 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 697 | { |
4f6b8288 | 698 | size_t nmembs = argv->v_nmembs; |
7942b919 KS |
699 | struct inode *cpfile = nilfs->ns_cpfile; |
700 | struct nilfs_period *periods = buf; | |
701 | int ret, i; | |
702 | ||
703 | for (i = 0; i < nmembs; i++) { | |
704 | ret = nilfs_cpfile_delete_checkpoints( | |
705 | cpfile, periods[i].p_start, periods[i].p_end); | |
706 | if (ret < 0) | |
707 | return ret; | |
708 | } | |
709 | return nmembs; | |
710 | } | |
711 | ||
d623a942 VD |
712 | /** |
713 | * nilfs_ioctl_free_vblocknrs - free virtual block numbers | |
714 | * @nilfs: nilfs object | |
715 | * @argv: vector of arguments from userspace | |
716 | * @buf: array of virtual block numbers | |
717 | * | |
718 | * Description: nilfs_ioctl_free_vblocknrs() function frees | |
719 | * the virtual block numbers specified by @buf and @argv->v_nmembs. | |
720 | * | |
721 | * Return Value: Number of processed virtual block numbers or | |
722 | * error code, otherwise. | |
723 | * | |
724 | * %-EIO - I/O error. | |
725 | * | |
726 | * %-ENOMEM - Insufficient amount of memory available. | |
727 | * | |
728 | * %-ENOENT - The virtual block number have not been allocated. | |
729 | */ | |
4f6b8288 RK |
730 | static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs, |
731 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 732 | { |
4f6b8288 RK |
733 | size_t nmembs = argv->v_nmembs; |
734 | int ret; | |
7942b919 | 735 | |
365e215c | 736 | ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs); |
7942b919 KS |
737 | |
738 | return (ret < 0) ? ret : nmembs; | |
739 | } | |
740 | ||
d623a942 VD |
741 | /** |
742 | * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty | |
743 | * @nilfs: nilfs object | |
744 | * @argv: vector of arguments from userspace | |
745 | * @buf: array of block descriptors | |
746 | * | |
747 | * Description: nilfs_ioctl_mark_blocks_dirty() function marks | |
748 | * metadata file or data blocks as dirty. | |
749 | * | |
750 | * Return Value: Number of processed block descriptors or | |
751 | * error code, otherwise. | |
752 | * | |
753 | * %-ENOMEM - Insufficient memory available. | |
754 | * | |
755 | * %-EIO - I/O error | |
756 | * | |
757 | * %-ENOENT - the specified block does not exist (hole block) | |
758 | */ | |
4f6b8288 RK |
759 | static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs, |
760 | struct nilfs_argv *argv, void *buf) | |
7942b919 | 761 | { |
4f6b8288 | 762 | size_t nmembs = argv->v_nmembs; |
365e215c | 763 | struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap; |
7942b919 | 764 | struct nilfs_bdesc *bdescs = buf; |
24e20ead | 765 | struct buffer_head *bh; |
7942b919 KS |
766 | int ret, i; |
767 | ||
768 | for (i = 0; i < nmembs; i++) { | |
769 | /* XXX: use macro or inline func to check liveness */ | |
770 | ret = nilfs_bmap_lookup_at_level(bmap, | |
771 | bdescs[i].bd_offset, | |
772 | bdescs[i].bd_level + 1, | |
773 | &bdescs[i].bd_blocknr); | |
774 | if (ret < 0) { | |
775 | if (ret != -ENOENT) | |
776 | return ret; | |
777 | bdescs[i].bd_blocknr = 0; | |
778 | } | |
779 | if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr) | |
780 | /* skip dead block */ | |
781 | continue; | |
782 | if (bdescs[i].bd_level == 0) { | |
24e20ead RK |
783 | ret = nilfs_mdt_get_block(nilfs->ns_dat, |
784 | bdescs[i].bd_offset, | |
785 | false, NULL, &bh); | |
786 | if (unlikely(ret)) { | |
1f5abe7e | 787 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
788 | return ret; |
789 | } | |
24e20ead RK |
790 | mark_buffer_dirty(bh); |
791 | nilfs_mdt_mark_dirty(nilfs->ns_dat); | |
792 | put_bh(bh); | |
7942b919 KS |
793 | } else { |
794 | ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset, | |
795 | bdescs[i].bd_level); | |
796 | if (ret < 0) { | |
1f5abe7e | 797 | WARN_ON(ret == -ENOENT); |
7942b919 KS |
798 | return ret; |
799 | } | |
800 | } | |
801 | } | |
802 | return nmembs; | |
803 | } | |
804 | ||
7942b919 | 805 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs, |
4f6b8288 | 806 | struct nilfs_argv *argv, void **kbufs) |
7942b919 | 807 | { |
1f5abe7e | 808 | const char *msg; |
4f6b8288 | 809 | int ret; |
7942b919 | 810 | |
4f6b8288 | 811 | ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]); |
1f5abe7e RK |
812 | if (ret < 0) { |
813 | /* | |
814 | * can safely abort because checkpoints can be removed | |
815 | * independently. | |
816 | */ | |
817 | msg = "cannot delete checkpoints"; | |
818 | goto failed; | |
819 | } | |
4f6b8288 | 820 | ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]); |
1f5abe7e RK |
821 | if (ret < 0) { |
822 | /* | |
823 | * can safely abort because DAT file is updated atomically | |
824 | * using a copy-on-write technique. | |
825 | */ | |
826 | msg = "cannot delete virtual blocks from DAT file"; | |
827 | goto failed; | |
828 | } | |
4f6b8288 | 829 | ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]); |
1f5abe7e RK |
830 | if (ret < 0) { |
831 | /* | |
832 | * can safely abort because the operation is nondestructive. | |
833 | */ | |
834 | msg = "cannot mark copying blocks dirty"; | |
835 | goto failed; | |
836 | } | |
7942b919 KS |
837 | return 0; |
838 | ||
1f5abe7e | 839 | failed: |
feee880f RK |
840 | nilfs_msg(nilfs->ns_sb, KERN_ERR, "error %d preparing GC: %s", ret, |
841 | msg); | |
7942b919 KS |
842 | return ret; |
843 | } | |
844 | ||
d623a942 VD |
845 | /** |
846 | * nilfs_ioctl_clean_segments - clean segments | |
847 | * @inode: inode object | |
848 | * @filp: file object | |
849 | * @cmd: ioctl's request code | |
850 | * @argp: pointer on argument from userspace | |
851 | * | |
852 | * Description: nilfs_ioctl_clean_segments() function makes garbage | |
853 | * collection operation in the environment of requested parameters | |
854 | * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by | |
855 | * nilfs_cleanerd daemon. | |
856 | * | |
857 | * Return Value: On success, 0 is returned or error code, otherwise. | |
858 | */ | |
7942b919 KS |
859 | static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp, |
860 | unsigned int cmd, void __user *argp) | |
861 | { | |
4f6b8288 | 862 | struct nilfs_argv argv[5]; |
33e189bd | 863 | static const size_t argsz[5] = { |
4f6b8288 RK |
864 | sizeof(struct nilfs_vdesc), |
865 | sizeof(struct nilfs_period), | |
866 | sizeof(__u64), | |
867 | sizeof(struct nilfs_bdesc), | |
868 | sizeof(__u64), | |
869 | }; | |
870 | void __user *base; | |
871 | void *kbufs[5]; | |
872 | struct the_nilfs *nilfs; | |
873 | size_t len, nsegs; | |
874 | int n, ret; | |
875 | ||
7942b919 KS |
876 | if (!capable(CAP_SYS_ADMIN)) |
877 | return -EPERM; | |
4f6b8288 | 878 | |
a561be71 | 879 | ret = mnt_want_write_file(filp); |
7512487e RK |
880 | if (ret) |
881 | return ret; | |
882 | ||
883 | ret = -EFAULT; | |
4f6b8288 | 884 | if (copy_from_user(argv, argp, sizeof(argv))) |
7512487e | 885 | goto out; |
4f6b8288 | 886 | |
7512487e | 887 | ret = -EINVAL; |
4f6b8288 RK |
888 | nsegs = argv[4].v_nmembs; |
889 | if (argv[4].v_size != argsz[4]) | |
7512487e | 890 | goto out; |
1ecd3c7e XW |
891 | if (nsegs > UINT_MAX / sizeof(__u64)) |
892 | goto out; | |
7512487e | 893 | |
4f6b8288 RK |
894 | /* |
895 | * argv[4] points to segment numbers this ioctl cleans. We | |
896 | * use kmalloc() for its buffer because memory used for the | |
897 | * segment numbers is enough small. | |
898 | */ | |
899 | kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base, | |
900 | nsegs * sizeof(__u64)); | |
7512487e RK |
901 | if (IS_ERR(kbufs[4])) { |
902 | ret = PTR_ERR(kbufs[4]); | |
903 | goto out; | |
904 | } | |
e3154e97 | 905 | nilfs = inode->i_sb->s_fs_info; |
4f6b8288 RK |
906 | |
907 | for (n = 0; n < 4; n++) { | |
908 | ret = -EINVAL; | |
909 | if (argv[n].v_size != argsz[n]) | |
910 | goto out_free; | |
911 | ||
912 | if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment) | |
913 | goto out_free; | |
914 | ||
481fe17e HC |
915 | if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size) |
916 | goto out_free; | |
917 | ||
4f6b8288 RK |
918 | len = argv[n].v_size * argv[n].v_nmembs; |
919 | base = (void __user *)(unsigned long)argv[n].v_base; | |
920 | if (len == 0) { | |
921 | kbufs[n] = NULL; | |
922 | continue; | |
923 | } | |
924 | ||
925 | kbufs[n] = vmalloc(len); | |
926 | if (!kbufs[n]) { | |
927 | ret = -ENOMEM; | |
928 | goto out_free; | |
929 | } | |
930 | if (copy_from_user(kbufs[n], base, len)) { | |
931 | ret = -EFAULT; | |
932 | vfree(kbufs[n]); | |
933 | goto out_free; | |
934 | } | |
935 | } | |
936 | ||
1cf58fa8 | 937 | /* |
263d90ce | 938 | * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(), |
1cf58fa8 JS |
939 | * which will operates an inode list without blocking. |
940 | * To protect the list from concurrent operations, | |
941 | * nilfs_ioctl_move_blocks should be atomic operation. | |
942 | */ | |
943 | if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) { | |
944 | ret = -EBUSY; | |
945 | goto out_free; | |
946 | } | |
947 | ||
263d90ce | 948 | ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]); |
feee880f RK |
949 | if (ret < 0) { |
950 | nilfs_msg(inode->i_sb, KERN_ERR, | |
951 | "error %d preparing GC: cannot read source blocks", | |
952 | ret); | |
953 | } else { | |
a9bae189 VD |
954 | if (nilfs_sb_need_update(nilfs)) |
955 | set_nilfs_discontinued(nilfs); | |
1cf58fa8 | 956 | ret = nilfs_clean_segments(inode->i_sb, argv, kbufs); |
a9bae189 | 957 | } |
1cf58fa8 | 958 | |
263d90ce | 959 | nilfs_remove_all_gcinodes(nilfs); |
1cf58fa8 | 960 | clear_nilfs_gc_running(nilfs); |
4f6b8288 | 961 | |
7512487e | 962 | out_free: |
d5046853 | 963 | while (--n >= 0) |
4f6b8288 RK |
964 | vfree(kbufs[n]); |
965 | kfree(kbufs[4]); | |
7512487e | 966 | out: |
2a79f17e | 967 | mnt_drop_write_file(filp); |
4f6b8288 | 968 | return ret; |
7942b919 KS |
969 | } |
970 | ||
d623a942 VD |
971 | /** |
972 | * nilfs_ioctl_sync - make a checkpoint | |
973 | * @inode: inode object | |
974 | * @filp: file object | |
975 | * @cmd: ioctl's request code | |
976 | * @argp: pointer on argument from userspace | |
977 | * | |
978 | * Description: nilfs_ioctl_sync() function constructs a logical segment | |
979 | * for checkpointing. This function guarantees that all modified data | |
980 | * and metadata are written out to the device when it successfully | |
981 | * returned. | |
982 | * | |
983 | * Return Value: On success, 0 is retured. On errors, one of the following | |
984 | * negative error code is returned. | |
985 | * | |
986 | * %-EROFS - Read only filesystem. | |
987 | * | |
988 | * %-EIO - I/O error | |
989 | * | |
990 | * %-ENOSPC - No space left on device (only in a panic state). | |
991 | * | |
992 | * %-ERESTARTSYS - Interrupted. | |
993 | * | |
994 | * %-ENOMEM - Insufficient memory available. | |
995 | * | |
996 | * %-EFAULT - Failure during execution of requested operation. | |
997 | */ | |
7942b919 KS |
998 | static int nilfs_ioctl_sync(struct inode *inode, struct file *filp, |
999 | unsigned int cmd, void __user *argp) | |
1000 | { | |
1001 | __u64 cno; | |
1002 | int ret; | |
0d561f12 | 1003 | struct the_nilfs *nilfs; |
7942b919 KS |
1004 | |
1005 | ret = nilfs_construct_segment(inode->i_sb); | |
1006 | if (ret < 0) | |
1007 | return ret; | |
1008 | ||
11475975 | 1009 | nilfs = inode->i_sb->s_fs_info; |
e2c7617a AR |
1010 | ret = nilfs_flush_device(nilfs); |
1011 | if (ret < 0) | |
1012 | return ret; | |
11475975 | 1013 | |
7942b919 | 1014 | if (argp != NULL) { |
0d561f12 JS |
1015 | down_read(&nilfs->ns_segctor_sem); |
1016 | cno = nilfs->ns_cno - 1; | |
1017 | up_read(&nilfs->ns_segctor_sem); | |
7942b919 KS |
1018 | if (copy_to_user(argp, &cno, sizeof(cno))) |
1019 | return -EFAULT; | |
1020 | } | |
1021 | return 0; | |
1022 | } | |
1023 | ||
d623a942 VD |
1024 | /** |
1025 | * nilfs_ioctl_resize - resize NILFS2 volume | |
1026 | * @inode: inode object | |
1027 | * @filp: file object | |
1028 | * @argp: pointer on argument from userspace | |
1029 | * | |
1030 | * Return Value: On success, 0 is returned or error code, otherwise. | |
1031 | */ | |
4e33f9ea RK |
1032 | static int nilfs_ioctl_resize(struct inode *inode, struct file *filp, |
1033 | void __user *argp) | |
1034 | { | |
1035 | __u64 newsize; | |
1036 | int ret = -EPERM; | |
1037 | ||
1038 | if (!capable(CAP_SYS_ADMIN)) | |
1039 | goto out; | |
1040 | ||
a561be71 | 1041 | ret = mnt_want_write_file(filp); |
4e33f9ea RK |
1042 | if (ret) |
1043 | goto out; | |
1044 | ||
1045 | ret = -EFAULT; | |
1046 | if (copy_from_user(&newsize, argp, sizeof(newsize))) | |
1047 | goto out_drop_write; | |
1048 | ||
1049 | ret = nilfs_resize_fs(inode->i_sb, newsize); | |
1050 | ||
1051 | out_drop_write: | |
2a79f17e | 1052 | mnt_drop_write_file(filp); |
4e33f9ea RK |
1053 | out: |
1054 | return ret; | |
1055 | } | |
1056 | ||
f9f32c44 AR |
1057 | /** |
1058 | * nilfs_ioctl_trim_fs() - trim ioctl handle function | |
1059 | * @inode: inode object | |
1060 | * @argp: pointer on argument from userspace | |
1061 | * | |
1062 | * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It | |
1063 | * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which | |
1064 | * performs the actual trim operation. | |
1065 | * | |
1066 | * Return Value: On success, 0 is returned or negative error code, otherwise. | |
1067 | */ | |
1068 | static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp) | |
1069 | { | |
1070 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1071 | struct request_queue *q = bdev_get_queue(nilfs->ns_bdev); | |
1072 | struct fstrim_range range; | |
1073 | int ret; | |
1074 | ||
1075 | if (!capable(CAP_SYS_ADMIN)) | |
1076 | return -EPERM; | |
1077 | ||
1078 | if (!blk_queue_discard(q)) | |
1079 | return -EOPNOTSUPP; | |
1080 | ||
1081 | if (copy_from_user(&range, argp, sizeof(range))) | |
1082 | return -EFAULT; | |
1083 | ||
1084 | range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity); | |
1085 | ||
1086 | down_read(&nilfs->ns_segctor_sem); | |
1087 | ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range); | |
1088 | up_read(&nilfs->ns_segctor_sem); | |
1089 | ||
1090 | if (ret < 0) | |
1091 | return ret; | |
1092 | ||
1093 | if (copy_to_user(argp, &range, sizeof(range))) | |
1094 | return -EFAULT; | |
1095 | ||
1096 | return 0; | |
1097 | } | |
1098 | ||
d623a942 VD |
1099 | /** |
1100 | * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated | |
1101 | * @inode: inode object | |
1102 | * @argp: pointer on argument from userspace | |
1103 | * | |
1104 | * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit | |
1105 | * of segments in bytes and upper limit of segments in bytes. | |
1106 | * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility. | |
1107 | * | |
1108 | * Return Value: On success, 0 is returned or error code, otherwise. | |
1109 | */ | |
619205da RK |
1110 | static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp) |
1111 | { | |
1112 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1113 | __u64 range[2]; | |
1114 | __u64 minseg, maxseg; | |
1115 | unsigned long segbytes; | |
1116 | int ret = -EPERM; | |
1117 | ||
1118 | if (!capable(CAP_SYS_ADMIN)) | |
1119 | goto out; | |
1120 | ||
1121 | ret = -EFAULT; | |
1122 | if (copy_from_user(range, argp, sizeof(__u64[2]))) | |
1123 | goto out; | |
1124 | ||
1125 | ret = -ERANGE; | |
1126 | if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode)) | |
1127 | goto out; | |
1128 | ||
1129 | segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize; | |
1130 | ||
1131 | minseg = range[0] + segbytes - 1; | |
1132 | do_div(minseg, segbytes); | |
1133 | maxseg = NILFS_SB2_OFFSET_BYTES(range[1]); | |
1134 | do_div(maxseg, segbytes); | |
1135 | maxseg--; | |
1136 | ||
1137 | ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg); | |
1138 | out: | |
1139 | return ret; | |
1140 | } | |
1141 | ||
d623a942 VD |
1142 | /** |
1143 | * nilfs_ioctl_get_info - wrapping function of get metadata info | |
1144 | * @inode: inode object | |
1145 | * @filp: file object | |
1146 | * @cmd: ioctl's request code | |
1147 | * @argp: pointer on argument from userspace | |
1148 | * @membsz: size of an item in bytes | |
1149 | * @dofunc: concrete function of getting metadata info | |
1150 | * | |
1151 | * Description: nilfs_ioctl_get_info() gets metadata info by means of | |
1152 | * calling dofunc() function. | |
1153 | * | |
1154 | * Return Value: On success, 0 is returned and requested metadata info | |
1155 | * is copied into userspace. On error, one of the following | |
1156 | * negative error codes is returned. | |
1157 | * | |
1158 | * %-EINVAL - Invalid arguments from userspace. | |
1159 | * | |
1160 | * %-ENOMEM - Insufficient amount of memory available. | |
1161 | * | |
1162 | * %-EFAULT - Failure during execution of requested operation. | |
1163 | */ | |
47eb6b9c RK |
1164 | static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp, |
1165 | unsigned int cmd, void __user *argp, | |
83aca8f4 | 1166 | size_t membsz, |
47eb6b9c RK |
1167 | ssize_t (*dofunc)(struct the_nilfs *, |
1168 | __u64 *, int, | |
1169 | void *, size_t, size_t)) | |
1170 | ||
1171 | { | |
e3154e97 | 1172 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
47eb6b9c RK |
1173 | struct nilfs_argv argv; |
1174 | int ret; | |
1175 | ||
1176 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1177 | return -EFAULT; | |
1178 | ||
003ff182 | 1179 | if (argv.v_size < membsz) |
83aca8f4 RK |
1180 | return -EINVAL; |
1181 | ||
47eb6b9c RK |
1182 | ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc); |
1183 | if (ret < 0) | |
1184 | return ret; | |
1185 | ||
1186 | if (copy_to_user(argp, &argv, sizeof(argv))) | |
1187 | ret = -EFAULT; | |
1188 | return ret; | |
1189 | } | |
1190 | ||
2cc88f3a AR |
1191 | /** |
1192 | * nilfs_ioctl_set_suinfo - set segment usage info | |
1193 | * @inode: inode object | |
1194 | * @filp: file object | |
1195 | * @cmd: ioctl's request code | |
1196 | * @argp: pointer on argument from userspace | |
1197 | * | |
1198 | * Description: Expects an array of nilfs_suinfo_update structures | |
1199 | * encapsulated in nilfs_argv and updates the segment usage info | |
1200 | * according to the flags in nilfs_suinfo_update. | |
1201 | * | |
1202 | * Return Value: On success, 0 is returned. On error, one of the | |
1203 | * following negative error codes is returned. | |
1204 | * | |
1205 | * %-EPERM - Not enough permissions | |
1206 | * | |
1207 | * %-EFAULT - Error copying input data | |
1208 | * | |
1209 | * %-EIO - I/O error. | |
1210 | * | |
1211 | * %-ENOMEM - Insufficient amount of memory available. | |
1212 | * | |
1213 | * %-EINVAL - Invalid values in input (segment number, flags or nblocks) | |
1214 | */ | |
1215 | static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp, | |
1216 | unsigned int cmd, void __user *argp) | |
1217 | { | |
1218 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
1219 | struct nilfs_transaction_info ti; | |
1220 | struct nilfs_argv argv; | |
1221 | size_t len; | |
1222 | void __user *base; | |
1223 | void *kbuf; | |
1224 | int ret; | |
1225 | ||
1226 | if (!capable(CAP_SYS_ADMIN)) | |
1227 | return -EPERM; | |
1228 | ||
1229 | ret = mnt_want_write_file(filp); | |
1230 | if (ret) | |
1231 | return ret; | |
1232 | ||
1233 | ret = -EFAULT; | |
1234 | if (copy_from_user(&argv, argp, sizeof(argv))) | |
1235 | goto out; | |
1236 | ||
1237 | ret = -EINVAL; | |
1238 | if (argv.v_size < sizeof(struct nilfs_suinfo_update)) | |
1239 | goto out; | |
1240 | ||
1241 | if (argv.v_nmembs > nilfs->ns_nsegments) | |
1242 | goto out; | |
1243 | ||
1244 | if (argv.v_nmembs >= UINT_MAX / argv.v_size) | |
1245 | goto out; | |
1246 | ||
1247 | len = argv.v_size * argv.v_nmembs; | |
1248 | if (!len) { | |
1249 | ret = 0; | |
1250 | goto out; | |
1251 | } | |
1252 | ||
1253 | base = (void __user *)(unsigned long)argv.v_base; | |
1254 | kbuf = vmalloc(len); | |
1255 | if (!kbuf) { | |
1256 | ret = -ENOMEM; | |
1257 | goto out; | |
1258 | } | |
1259 | ||
1260 | if (copy_from_user(kbuf, base, len)) { | |
1261 | ret = -EFAULT; | |
1262 | goto out_free; | |
1263 | } | |
1264 | ||
1265 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
1266 | ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size, | |
1267 | argv.v_nmembs); | |
1268 | if (unlikely(ret < 0)) | |
1269 | nilfs_transaction_abort(inode->i_sb); | |
1270 | else | |
1271 | nilfs_transaction_commit(inode->i_sb); /* never fails */ | |
1272 | ||
1273 | out_free: | |
1274 | vfree(kbuf); | |
1275 | out: | |
1276 | mnt_drop_write_file(filp); | |
1277 | return ret; | |
1278 | } | |
1279 | ||
7a946193 | 1280 | long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
7942b919 | 1281 | { |
496ad9aa | 1282 | struct inode *inode = file_inode(filp); |
75323400 | 1283 | void __user *argp = (void __user *)arg; |
7942b919 KS |
1284 | |
1285 | switch (cmd) { | |
cde98f0f RK |
1286 | case FS_IOC_GETFLAGS: |
1287 | return nilfs_ioctl_getflags(inode, argp); | |
1288 | case FS_IOC_SETFLAGS: | |
1289 | return nilfs_ioctl_setflags(inode, filp, argp); | |
1290 | case FS_IOC_GETVERSION: | |
1291 | return nilfs_ioctl_getversion(inode, argp); | |
7942b919 KS |
1292 | case NILFS_IOCTL_CHANGE_CPMODE: |
1293 | return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp); | |
1294 | case NILFS_IOCTL_DELETE_CHECKPOINT: | |
1295 | return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp); | |
1296 | case NILFS_IOCTL_GET_CPINFO: | |
47eb6b9c | 1297 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1298 | sizeof(struct nilfs_cpinfo), |
47eb6b9c | 1299 | nilfs_ioctl_do_get_cpinfo); |
7942b919 KS |
1300 | case NILFS_IOCTL_GET_CPSTAT: |
1301 | return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp); | |
1302 | case NILFS_IOCTL_GET_SUINFO: | |
47eb6b9c | 1303 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1304 | sizeof(struct nilfs_suinfo), |
47eb6b9c | 1305 | nilfs_ioctl_do_get_suinfo); |
2cc88f3a AR |
1306 | case NILFS_IOCTL_SET_SUINFO: |
1307 | return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp); | |
7942b919 KS |
1308 | case NILFS_IOCTL_GET_SUSTAT: |
1309 | return nilfs_ioctl_get_sustat(inode, filp, cmd, argp); | |
1310 | case NILFS_IOCTL_GET_VINFO: | |
47eb6b9c | 1311 | return nilfs_ioctl_get_info(inode, filp, cmd, argp, |
83aca8f4 | 1312 | sizeof(struct nilfs_vinfo), |
47eb6b9c | 1313 | nilfs_ioctl_do_get_vinfo); |
7942b919 KS |
1314 | case NILFS_IOCTL_GET_BDESCS: |
1315 | return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp); | |
1316 | case NILFS_IOCTL_CLEAN_SEGMENTS: | |
1317 | return nilfs_ioctl_clean_segments(inode, filp, cmd, argp); | |
7942b919 KS |
1318 | case NILFS_IOCTL_SYNC: |
1319 | return nilfs_ioctl_sync(inode, filp, cmd, argp); | |
4e33f9ea RK |
1320 | case NILFS_IOCTL_RESIZE: |
1321 | return nilfs_ioctl_resize(inode, filp, argp); | |
619205da RK |
1322 | case NILFS_IOCTL_SET_ALLOC_RANGE: |
1323 | return nilfs_ioctl_set_alloc_range(inode, argp); | |
f9f32c44 AR |
1324 | case FITRIM: |
1325 | return nilfs_ioctl_trim_fs(inode, argp); | |
7942b919 KS |
1326 | default: |
1327 | return -ENOTTY; | |
1328 | } | |
1329 | } | |
828b1c50 RK |
1330 | |
1331 | #ifdef CONFIG_COMPAT | |
1332 | long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1333 | { | |
1334 | switch (cmd) { | |
1335 | case FS_IOC32_GETFLAGS: | |
1336 | cmd = FS_IOC_GETFLAGS; | |
1337 | break; | |
1338 | case FS_IOC32_SETFLAGS: | |
1339 | cmd = FS_IOC_SETFLAGS; | |
1340 | break; | |
1341 | case FS_IOC32_GETVERSION: | |
1342 | cmd = FS_IOC_GETVERSION; | |
1343 | break; | |
695c60f2 TM |
1344 | case NILFS_IOCTL_CHANGE_CPMODE: |
1345 | case NILFS_IOCTL_DELETE_CHECKPOINT: | |
1346 | case NILFS_IOCTL_GET_CPINFO: | |
1347 | case NILFS_IOCTL_GET_CPSTAT: | |
1348 | case NILFS_IOCTL_GET_SUINFO: | |
2cc88f3a | 1349 | case NILFS_IOCTL_SET_SUINFO: |
695c60f2 TM |
1350 | case NILFS_IOCTL_GET_SUSTAT: |
1351 | case NILFS_IOCTL_GET_VINFO: | |
1352 | case NILFS_IOCTL_GET_BDESCS: | |
1353 | case NILFS_IOCTL_CLEAN_SEGMENTS: | |
1354 | case NILFS_IOCTL_SYNC: | |
1355 | case NILFS_IOCTL_RESIZE: | |
1356 | case NILFS_IOCTL_SET_ALLOC_RANGE: | |
1357 | break; | |
828b1c50 RK |
1358 | default: |
1359 | return -ENOIOCTLCMD; | |
1360 | } | |
1361 | return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1362 | } | |
1363 | #endif |