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70e083d2 TG |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
22 | * Copyright (C) 2011 Lawrence Livermore National Security, LLC. | |
23 | * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). | |
24 | * LLNL-CODE-403049. | |
25 | * Rewritten for Linux by: | |
26 | * Rohan Puri <rohan.puri15@gmail.com> | |
27 | * Brian Behlendorf <behlendorf1@llnl.gov> | |
28 | */ | |
29 | ||
30 | #include <sys/zfs_vfsops.h> | |
31 | #include <sys/zfs_vnops.h> | |
32 | #include <sys/zfs_znode.h> | |
33 | #include <sys/zfs_ctldir.h> | |
34 | #include <sys/zpl.h> | |
35 | ||
36 | /* | |
37 | * Common open routine. Disallow any write access. | |
38 | */ | |
39 | /* ARGSUSED */ | |
40 | static int | |
41 | zpl_common_open(struct inode *ip, struct file *filp) | |
42 | { | |
43 | if (filp->f_mode & FMODE_WRITE) | |
44 | return (-EACCES); | |
45 | ||
46 | return (generic_file_open(ip, filp)); | |
47 | } | |
48 | ||
49 | /* | |
50 | * Get root directory contents. | |
51 | */ | |
52 | static int | |
53 | zpl_root_iterate(struct file *filp, struct dir_context *ctx) | |
54 | { | |
55 | zfs_sb_t *zsb = ITOZSB(filp->f_path.dentry->d_inode); | |
56 | int error = 0; | |
57 | ||
58 | ZFS_ENTER(zsb); | |
59 | ||
60 | if (!dir_emit_dots(filp, ctx)) | |
61 | goto out; | |
62 | ||
63 | if (ctx->pos == 2) { | |
64 | if (!dir_emit(ctx, ZFS_SNAPDIR_NAME, strlen(ZFS_SNAPDIR_NAME), | |
65 | ZFSCTL_INO_SNAPDIR, DT_DIR)) | |
66 | goto out; | |
67 | ||
68 | ctx->pos++; | |
69 | } | |
70 | ||
71 | if (ctx->pos == 3) { | |
72 | if (!dir_emit(ctx, ZFS_SHAREDIR_NAME, strlen(ZFS_SHAREDIR_NAME), | |
73 | ZFSCTL_INO_SHARES, DT_DIR)) | |
74 | goto out; | |
75 | ||
76 | ctx->pos++; | |
77 | } | |
78 | out: | |
79 | ZFS_EXIT(zsb); | |
80 | ||
81 | return (error); | |
82 | } | |
83 | ||
84 | #if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED) | |
85 | static int | |
86 | zpl_root_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
87 | { | |
88 | struct dir_context ctx = DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos); | |
89 | int error; | |
90 | ||
91 | error = zpl_root_iterate(filp, &ctx); | |
92 | filp->f_pos = ctx.pos; | |
93 | ||
94 | return (error); | |
95 | } | |
96 | #endif /* HAVE_VFS_ITERATE */ | |
97 | ||
98 | /* | |
99 | * Get root directory attributes. | |
100 | */ | |
101 | /* ARGSUSED */ | |
102 | static int | |
0d6103dd CIK |
103 | zpl_root_getattr_impl(const struct path *path, struct kstat *stat, |
104 | u32 request_mask, unsigned int query_flags) | |
70e083d2 | 105 | { |
837ca015 CIK |
106 | struct inode *ip = path->dentry->d_inode; |
107 | ||
108 | generic_fillattr(ip, stat); | |
109 | stat->atime = current_time(ip); | |
70e083d2 | 110 | |
0d6103dd | 111 | return (0); |
70e083d2 | 112 | } |
0d6103dd | 113 | ZPL_GETATTR_WRAPPER(zpl_root_getattr); |
70e083d2 TG |
114 | |
115 | static struct dentry * | |
116 | #ifdef HAVE_LOOKUP_NAMEIDATA | |
117 | zpl_root_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd) | |
118 | #else | |
119 | zpl_root_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags) | |
120 | #endif | |
121 | { | |
122 | cred_t *cr = CRED(); | |
123 | struct inode *ip; | |
124 | int error; | |
125 | ||
126 | crhold(cr); | |
127 | error = -zfsctl_root_lookup(dip, dname(dentry), &ip, 0, cr, NULL, NULL); | |
128 | ASSERT3S(error, <=, 0); | |
129 | crfree(cr); | |
130 | ||
131 | if (error) { | |
132 | if (error == -ENOENT) | |
133 | return (d_splice_alias(NULL, dentry)); | |
134 | else | |
135 | return (ERR_PTR(error)); | |
136 | } | |
137 | ||
138 | return (d_splice_alias(ip, dentry)); | |
139 | } | |
140 | ||
141 | /* | |
142 | * The '.zfs' control directory file and inode operations. | |
143 | */ | |
144 | const struct file_operations zpl_fops_root = { | |
145 | .open = zpl_common_open, | |
146 | .llseek = generic_file_llseek, | |
147 | .read = generic_read_dir, | |
148 | #ifdef HAVE_VFS_ITERATE_SHARED | |
149 | .iterate_shared = zpl_root_iterate, | |
150 | #elif defined(HAVE_VFS_ITERATE) | |
151 | .iterate = zpl_root_iterate, | |
152 | #else | |
153 | .readdir = zpl_root_readdir, | |
154 | #endif | |
155 | }; | |
156 | ||
157 | const struct inode_operations zpl_ops_root = { | |
158 | .lookup = zpl_root_lookup, | |
159 | .getattr = zpl_root_getattr, | |
160 | }; | |
161 | ||
162 | #ifdef HAVE_AUTOMOUNT | |
163 | static struct vfsmount * | |
164 | zpl_snapdir_automount(struct path *path) | |
165 | { | |
166 | int error; | |
167 | ||
168 | error = -zfsctl_snapshot_mount(path, 0); | |
169 | if (error) | |
170 | return (ERR_PTR(error)); | |
171 | ||
172 | /* | |
173 | * Rather than returning the new vfsmount for the snapshot we must | |
174 | * return NULL to indicate a mount collision. This is done because | |
175 | * the user space mount calls do_add_mount() which adds the vfsmount | |
176 | * to the name space. If we returned the new mount here it would be | |
177 | * added again to the vfsmount list resulting in list corruption. | |
178 | */ | |
179 | return (NULL); | |
180 | } | |
181 | #endif /* HAVE_AUTOMOUNT */ | |
182 | ||
183 | /* | |
184 | * Negative dentries must always be revalidated so newly created snapshots | |
185 | * can be detected and automounted. Normal dentries should be kept because | |
186 | * as of the 3.18 kernel revaliding the mountpoint dentry will result in | |
187 | * the snapshot being immediately unmounted. | |
188 | */ | |
189 | static int | |
190 | #ifdef HAVE_D_REVALIDATE_NAMEIDATA | |
191 | zpl_snapdir_revalidate(struct dentry *dentry, struct nameidata *i) | |
192 | #else | |
193 | zpl_snapdir_revalidate(struct dentry *dentry, unsigned int flags) | |
194 | #endif | |
195 | { | |
196 | return (!!dentry->d_inode); | |
197 | } | |
198 | ||
199 | dentry_operations_t zpl_dops_snapdirs = { | |
200 | /* | |
201 | * Auto mounting of snapshots is only supported for 2.6.37 and | |
202 | * newer kernels. Prior to this kernel the ops->follow_link() | |
203 | * callback was used as a hack to trigger the mount. The | |
204 | * resulting vfsmount was then explicitly grafted in to the | |
205 | * name space. While it might be possible to add compatibility | |
206 | * code to accomplish this it would require considerable care. | |
207 | */ | |
208 | #ifdef HAVE_AUTOMOUNT | |
209 | .d_automount = zpl_snapdir_automount, | |
210 | #endif /* HAVE_AUTOMOUNT */ | |
211 | .d_revalidate = zpl_snapdir_revalidate, | |
212 | }; | |
213 | ||
214 | static struct dentry * | |
215 | #ifdef HAVE_LOOKUP_NAMEIDATA | |
216 | zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry, | |
217 | struct nameidata *nd) | |
218 | #else | |
219 | zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry, | |
220 | unsigned int flags) | |
221 | #endif | |
222 | ||
223 | { | |
224 | fstrans_cookie_t cookie; | |
225 | cred_t *cr = CRED(); | |
226 | struct inode *ip = NULL; | |
227 | int error; | |
228 | ||
229 | crhold(cr); | |
230 | cookie = spl_fstrans_mark(); | |
231 | error = -zfsctl_snapdir_lookup(dip, dname(dentry), &ip, | |
232 | 0, cr, NULL, NULL); | |
233 | ASSERT3S(error, <=, 0); | |
234 | spl_fstrans_unmark(cookie); | |
235 | crfree(cr); | |
236 | ||
237 | if (error && error != -ENOENT) | |
238 | return (ERR_PTR(error)); | |
239 | ||
240 | ASSERT(error == 0 || ip == NULL); | |
241 | d_clear_d_op(dentry); | |
242 | d_set_d_op(dentry, &zpl_dops_snapdirs); | |
243 | #ifdef HAVE_AUTOMOUNT | |
244 | dentry->d_flags |= DCACHE_NEED_AUTOMOUNT; | |
245 | #endif | |
246 | ||
247 | return (d_splice_alias(ip, dentry)); | |
248 | } | |
249 | ||
250 | static int | |
251 | zpl_snapdir_iterate(struct file *filp, struct dir_context *ctx) | |
252 | { | |
253 | zfs_sb_t *zsb = ITOZSB(filp->f_path.dentry->d_inode); | |
254 | fstrans_cookie_t cookie; | |
255 | char snapname[MAXNAMELEN]; | |
256 | boolean_t case_conflict; | |
257 | uint64_t id, pos; | |
258 | int error = 0; | |
259 | ||
260 | ZFS_ENTER(zsb); | |
261 | cookie = spl_fstrans_mark(); | |
262 | ||
263 | if (!dir_emit_dots(filp, ctx)) | |
264 | goto out; | |
265 | ||
266 | pos = ctx->pos; | |
267 | while (error == 0) { | |
268 | dsl_pool_config_enter(dmu_objset_pool(zsb->z_os), FTAG); | |
269 | error = -dmu_snapshot_list_next(zsb->z_os, MAXNAMELEN, | |
270 | snapname, &id, &pos, &case_conflict); | |
271 | dsl_pool_config_exit(dmu_objset_pool(zsb->z_os), FTAG); | |
272 | if (error) | |
273 | goto out; | |
274 | ||
275 | if (!dir_emit(ctx, snapname, strlen(snapname), | |
276 | ZFSCTL_INO_SHARES - id, DT_DIR)) | |
277 | goto out; | |
278 | ||
279 | ctx->pos = pos; | |
280 | } | |
281 | out: | |
282 | spl_fstrans_unmark(cookie); | |
283 | ZFS_EXIT(zsb); | |
284 | ||
285 | if (error == -ENOENT) | |
286 | return (0); | |
287 | ||
288 | return (error); | |
289 | } | |
290 | ||
291 | #if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED) | |
292 | static int | |
293 | zpl_snapdir_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
294 | { | |
295 | struct dir_context ctx = DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos); | |
296 | int error; | |
297 | ||
298 | error = zpl_snapdir_iterate(filp, &ctx); | |
299 | filp->f_pos = ctx.pos; | |
300 | ||
301 | return (error); | |
302 | } | |
303 | #endif /* HAVE_VFS_ITERATE */ | |
304 | ||
305 | static int | |
306 | zpl_snapdir_rename2(struct inode *sdip, struct dentry *sdentry, | |
307 | struct inode *tdip, struct dentry *tdentry, unsigned int flags) | |
308 | { | |
309 | cred_t *cr = CRED(); | |
310 | int error; | |
311 | ||
312 | /* We probably don't want to support renameat2(2) in ctldir */ | |
313 | if (flags) | |
314 | return (-EINVAL); | |
315 | ||
316 | crhold(cr); | |
317 | error = -zfsctl_snapdir_rename(sdip, dname(sdentry), | |
318 | tdip, dname(tdentry), cr, 0); | |
319 | ASSERT3S(error, <=, 0); | |
320 | crfree(cr); | |
321 | ||
322 | return (error); | |
323 | } | |
324 | ||
325 | #ifndef HAVE_RENAME_WANTS_FLAGS | |
326 | static int | |
327 | zpl_snapdir_rename(struct inode *sdip, struct dentry *sdentry, | |
328 | struct inode *tdip, struct dentry *tdentry) | |
329 | { | |
330 | return (zpl_snapdir_rename2(sdip, sdentry, tdip, tdentry, 0)); | |
331 | } | |
332 | #endif | |
333 | ||
334 | static int | |
335 | zpl_snapdir_rmdir(struct inode *dip, struct dentry *dentry) | |
336 | { | |
337 | cred_t *cr = CRED(); | |
338 | int error; | |
339 | ||
340 | crhold(cr); | |
341 | error = -zfsctl_snapdir_remove(dip, dname(dentry), cr, 0); | |
342 | ASSERT3S(error, <=, 0); | |
343 | crfree(cr); | |
344 | ||
345 | return (error); | |
346 | } | |
347 | ||
348 | static int | |
349 | zpl_snapdir_mkdir(struct inode *dip, struct dentry *dentry, zpl_umode_t mode) | |
350 | { | |
351 | cred_t *cr = CRED(); | |
352 | vattr_t *vap; | |
353 | struct inode *ip; | |
354 | int error; | |
355 | ||
356 | crhold(cr); | |
357 | vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP); | |
358 | zpl_vap_init(vap, dip, mode | S_IFDIR, cr); | |
359 | ||
360 | error = -zfsctl_snapdir_mkdir(dip, dname(dentry), vap, &ip, cr, 0); | |
361 | if (error == 0) { | |
362 | d_clear_d_op(dentry); | |
363 | d_set_d_op(dentry, &zpl_dops_snapdirs); | |
364 | d_instantiate(dentry, ip); | |
365 | } | |
366 | ||
367 | kmem_free(vap, sizeof (vattr_t)); | |
368 | ASSERT3S(error, <=, 0); | |
369 | crfree(cr); | |
370 | ||
371 | return (error); | |
372 | } | |
373 | ||
374 | /* | |
375 | * Get snapshot directory attributes. | |
376 | */ | |
377 | /* ARGSUSED */ | |
378 | static int | |
0d6103dd CIK |
379 | zpl_snapdir_getattr_impl(const struct path *path, struct kstat *stat, |
380 | u32 request_mask, unsigned int query_flags) | |
70e083d2 | 381 | { |
837ca015 CIK |
382 | struct inode *ip = path->dentry->d_inode; |
383 | zfs_sb_t *zsb = ITOZSB(ip); | |
70e083d2 TG |
384 | |
385 | ZFS_ENTER(zsb); | |
837ca015 | 386 | generic_fillattr(ip, stat); |
0d6103dd | 387 | |
70e083d2 TG |
388 | stat->nlink = stat->size = 2; |
389 | stat->ctime = stat->mtime = dmu_objset_snap_cmtime(zsb->z_os); | |
837ca015 | 390 | stat->atime = current_time(ip); |
70e083d2 TG |
391 | ZFS_EXIT(zsb); |
392 | ||
0d6103dd | 393 | return (0); |
70e083d2 | 394 | } |
0d6103dd | 395 | ZPL_GETATTR_WRAPPER(zpl_snapdir_getattr); |
70e083d2 TG |
396 | |
397 | /* | |
398 | * The '.zfs/snapshot' directory file operations. These mainly control | |
399 | * generating the list of available snapshots when doing an 'ls' in the | |
400 | * directory. See zpl_snapdir_readdir(). | |
401 | */ | |
402 | const struct file_operations zpl_fops_snapdir = { | |
403 | .open = zpl_common_open, | |
404 | .llseek = generic_file_llseek, | |
405 | .read = generic_read_dir, | |
406 | #ifdef HAVE_VFS_ITERATE_SHARED | |
407 | .iterate_shared = zpl_snapdir_iterate, | |
408 | #elif defined(HAVE_VFS_ITERATE) | |
409 | .iterate = zpl_snapdir_iterate, | |
410 | #else | |
411 | .readdir = zpl_snapdir_readdir, | |
412 | #endif | |
413 | ||
414 | }; | |
415 | ||
416 | /* | |
417 | * The '.zfs/snapshot' directory inode operations. These mainly control | |
418 | * creating an inode for a snapshot directory and initializing the needed | |
419 | * infrastructure to automount the snapshot. See zpl_snapdir_lookup(). | |
420 | */ | |
421 | const struct inode_operations zpl_ops_snapdir = { | |
422 | .lookup = zpl_snapdir_lookup, | |
423 | .getattr = zpl_snapdir_getattr, | |
424 | #ifdef HAVE_RENAME_WANTS_FLAGS | |
425 | .rename = zpl_snapdir_rename2, | |
426 | #else | |
427 | .rename = zpl_snapdir_rename, | |
428 | #endif | |
429 | .rmdir = zpl_snapdir_rmdir, | |
430 | .mkdir = zpl_snapdir_mkdir, | |
431 | }; | |
432 | ||
433 | static struct dentry * | |
434 | #ifdef HAVE_LOOKUP_NAMEIDATA | |
435 | zpl_shares_lookup(struct inode *dip, struct dentry *dentry, | |
436 | struct nameidata *nd) | |
437 | #else | |
438 | zpl_shares_lookup(struct inode *dip, struct dentry *dentry, | |
439 | unsigned int flags) | |
440 | #endif | |
441 | { | |
442 | fstrans_cookie_t cookie; | |
443 | cred_t *cr = CRED(); | |
444 | struct inode *ip = NULL; | |
445 | int error; | |
446 | ||
447 | crhold(cr); | |
448 | cookie = spl_fstrans_mark(); | |
449 | error = -zfsctl_shares_lookup(dip, dname(dentry), &ip, | |
450 | 0, cr, NULL, NULL); | |
451 | ASSERT3S(error, <=, 0); | |
452 | spl_fstrans_unmark(cookie); | |
453 | crfree(cr); | |
454 | ||
455 | if (error) { | |
456 | if (error == -ENOENT) | |
457 | return (d_splice_alias(NULL, dentry)); | |
458 | else | |
459 | return (ERR_PTR(error)); | |
460 | } | |
461 | ||
462 | return (d_splice_alias(ip, dentry)); | |
463 | } | |
464 | ||
465 | static int | |
466 | zpl_shares_iterate(struct file *filp, struct dir_context *ctx) | |
467 | { | |
468 | fstrans_cookie_t cookie; | |
469 | cred_t *cr = CRED(); | |
470 | zfs_sb_t *zsb = ITOZSB(filp->f_path.dentry->d_inode); | |
471 | znode_t *dzp; | |
472 | int error = 0; | |
473 | ||
474 | ZFS_ENTER(zsb); | |
475 | cookie = spl_fstrans_mark(); | |
476 | ||
477 | if (zsb->z_shares_dir == 0) { | |
478 | dir_emit_dots(filp, ctx); | |
479 | goto out; | |
480 | } | |
481 | ||
482 | error = -zfs_zget(zsb, zsb->z_shares_dir, &dzp); | |
483 | if (error) | |
484 | goto out; | |
485 | ||
486 | crhold(cr); | |
487 | error = -zfs_readdir(ZTOI(dzp), ctx, cr); | |
488 | crfree(cr); | |
489 | ||
490 | iput(ZTOI(dzp)); | |
491 | out: | |
492 | spl_fstrans_unmark(cookie); | |
493 | ZFS_EXIT(zsb); | |
494 | ASSERT3S(error, <=, 0); | |
495 | ||
496 | return (error); | |
497 | } | |
498 | ||
499 | #if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED) | |
500 | static int | |
501 | zpl_shares_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
502 | { | |
503 | struct dir_context ctx = DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos); | |
504 | int error; | |
505 | ||
506 | error = zpl_shares_iterate(filp, &ctx); | |
507 | filp->f_pos = ctx.pos; | |
508 | ||
509 | return (error); | |
510 | } | |
511 | #endif /* HAVE_VFS_ITERATE */ | |
512 | ||
513 | /* ARGSUSED */ | |
514 | static int | |
0d6103dd CIK |
515 | zpl_shares_getattr_impl(const struct path *path, struct kstat *stat, |
516 | u32 request_mask, unsigned int query_flags) | |
70e083d2 | 517 | { |
0d6103dd | 518 | struct inode *ip = path->dentry->d_inode; |
70e083d2 TG |
519 | zfs_sb_t *zsb = ITOZSB(ip); |
520 | znode_t *dzp; | |
521 | int error; | |
522 | ||
523 | ZFS_ENTER(zsb); | |
524 | ||
525 | if (zsb->z_shares_dir == 0) { | |
0d6103dd | 526 | generic_fillattr(path->dentry->d_inode, stat); |
70e083d2 | 527 | stat->nlink = stat->size = 2; |
837ca015 | 528 | stat->atime = current_time(ip); |
70e083d2 | 529 | ZFS_EXIT(zsb); |
0d6103dd | 530 | return (0); |
70e083d2 TG |
531 | } |
532 | ||
533 | error = -zfs_zget(zsb, zsb->z_shares_dir, &dzp); | |
534 | if (error == 0) { | |
535 | error = -zfs_getattr_fast(ZTOI(dzp), stat); | |
536 | iput(ZTOI(dzp)); | |
537 | } | |
538 | ||
539 | ZFS_EXIT(zsb); | |
540 | ASSERT3S(error, <=, 0); | |
541 | ||
542 | return (error); | |
543 | } | |
0d6103dd | 544 | ZPL_GETATTR_WRAPPER(zpl_shares_getattr); |
70e083d2 TG |
545 | |
546 | /* | |
547 | * The '.zfs/shares' directory file operations. | |
548 | */ | |
549 | const struct file_operations zpl_fops_shares = { | |
550 | .open = zpl_common_open, | |
551 | .llseek = generic_file_llseek, | |
552 | .read = generic_read_dir, | |
553 | #ifdef HAVE_VFS_ITERATE_SHARED | |
554 | .iterate_shared = zpl_shares_iterate, | |
555 | #elif defined(HAVE_VFS_ITERATE) | |
556 | .iterate = zpl_shares_iterate, | |
557 | #else | |
558 | .readdir = zpl_shares_readdir, | |
559 | #endif | |
560 | ||
561 | }; | |
562 | ||
563 | /* | |
564 | * The '.zfs/shares' directory inode operations. | |
565 | */ | |
566 | const struct inode_operations zpl_ops_shares = { | |
567 | .lookup = zpl_shares_lookup, | |
568 | .getattr = zpl_shares_getattr, | |
569 | }; |