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Commit | Line | Data |
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ebe7e575 BB |
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 | ||
d1d7e268 | 46 | return (generic_file_open(ip, filp)); |
ebe7e575 BB |
47 | } |
48 | ||
ebe7e575 BB |
49 | /* |
50 | * Get root directory contents. | |
51 | */ | |
52 | static int | |
9464b959 | 53 | zpl_root_iterate(struct file *filp, zpl_dir_context_t *ctx) |
ebe7e575 | 54 | { |
0037b49e | 55 | zfsvfs_t *zfsvfs = ITOZSB(file_inode(filp)); |
ebe7e575 BB |
56 | int error = 0; |
57 | ||
0037b49e | 58 | ZFS_ENTER(zfsvfs); |
ebe7e575 | 59 | |
9464b959 | 60 | if (!zpl_dir_emit_dots(filp, ctx)) |
0f37d0c8 | 61 | goto out; |
ebe7e575 | 62 | |
0f37d0c8 | 63 | if (ctx->pos == 2) { |
9464b959 BB |
64 | if (!zpl_dir_emit(ctx, ZFS_SNAPDIR_NAME, |
65 | strlen(ZFS_SNAPDIR_NAME), ZFSCTL_INO_SNAPDIR, DT_DIR)) | |
ebe7e575 BB |
66 | goto out; |
67 | ||
0f37d0c8 RY |
68 | ctx->pos++; |
69 | } | |
ebe7e575 | 70 | |
0f37d0c8 | 71 | if (ctx->pos == 3) { |
9464b959 BB |
72 | if (!zpl_dir_emit(ctx, ZFS_SHAREDIR_NAME, |
73 | strlen(ZFS_SHAREDIR_NAME), ZFSCTL_INO_SHARES, DT_DIR)) | |
ebe7e575 BB |
74 | goto out; |
75 | ||
0f37d0c8 | 76 | ctx->pos++; |
ebe7e575 BB |
77 | } |
78 | out: | |
0037b49e | 79 | ZFS_EXIT(zfsvfs); |
ebe7e575 BB |
80 | |
81 | return (error); | |
82 | } | |
83 | ||
9baaa7de | 84 | #if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED) |
0f37d0c8 RY |
85 | static int |
86 | zpl_root_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
87 | { | |
9464b959 BB |
88 | zpl_dir_context_t ctx = |
89 | ZPL_DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos); | |
0f37d0c8 RY |
90 | int error; |
91 | ||
92 | error = zpl_root_iterate(filp, &ctx); | |
93 | filp->f_pos = ctx.pos; | |
94 | ||
95 | return (error); | |
96 | } | |
9464b959 | 97 | #endif /* !HAVE_VFS_ITERATE && !HAVE_VFS_ITERATE_SHARED */ |
0f37d0c8 | 98 | |
ebe7e575 BB |
99 | /* |
100 | * Get root directory attributes. | |
101 | */ | |
102 | /* ARGSUSED */ | |
103 | static int | |
a3478c07 OF |
104 | zpl_root_getattr_impl(const struct path *path, struct kstat *stat, |
105 | u32 request_mask, unsigned int query_flags) | |
ebe7e575 | 106 | { |
2946a1a1 BB |
107 | struct inode *ip = path->dentry->d_inode; |
108 | ||
109 | generic_fillattr(ip, stat); | |
110 | stat->atime = current_time(ip); | |
ebe7e575 | 111 | |
a3478c07 | 112 | return (0); |
ebe7e575 | 113 | } |
a3478c07 | 114 | ZPL_GETATTR_WRAPPER(zpl_root_getattr); |
ebe7e575 BB |
115 | |
116 | static struct dentry * | |
8f195a90 | 117 | #ifdef HAVE_LOOKUP_NAMEIDATA |
ebe7e575 | 118 | zpl_root_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd) |
8f195a90 YS |
119 | #else |
120 | zpl_root_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags) | |
121 | #endif | |
ebe7e575 BB |
122 | { |
123 | cred_t *cr = CRED(); | |
124 | struct inode *ip; | |
125 | int error; | |
126 | ||
127 | crhold(cr); | |
128 | error = -zfsctl_root_lookup(dip, dname(dentry), &ip, 0, cr, NULL, NULL); | |
129 | ASSERT3S(error, <=, 0); | |
130 | crfree(cr); | |
131 | ||
132 | if (error) { | |
133 | if (error == -ENOENT) | |
d1d7e268 | 134 | return (d_splice_alias(NULL, dentry)); |
ebe7e575 | 135 | else |
d1d7e268 | 136 | return (ERR_PTR(error)); |
ebe7e575 BB |
137 | } |
138 | ||
d1d7e268 | 139 | return (d_splice_alias(ip, dentry)); |
ebe7e575 BB |
140 | } |
141 | ||
142 | /* | |
143 | * The '.zfs' control directory file and inode operations. | |
144 | */ | |
145 | const struct file_operations zpl_fops_root = { | |
146 | .open = zpl_common_open, | |
147 | .llseek = generic_file_llseek, | |
148 | .read = generic_read_dir, | |
9baaa7de CC |
149 | #ifdef HAVE_VFS_ITERATE_SHARED |
150 | .iterate_shared = zpl_root_iterate, | |
151 | #elif defined(HAVE_VFS_ITERATE) | |
0f37d0c8 RY |
152 | .iterate = zpl_root_iterate, |
153 | #else | |
ebe7e575 | 154 | .readdir = zpl_root_readdir, |
0f37d0c8 | 155 | #endif |
ebe7e575 BB |
156 | }; |
157 | ||
158 | const struct inode_operations zpl_ops_root = { | |
159 | .lookup = zpl_root_lookup, | |
160 | .getattr = zpl_root_getattr, | |
161 | }; | |
162 | ||
f1a05fa1 NB |
163 | #ifdef HAVE_AUTOMOUNT |
164 | static struct vfsmount * | |
165 | zpl_snapdir_automount(struct path *path) | |
166 | { | |
f1a05fa1 NB |
167 | int error; |
168 | ||
278bee93 | 169 | error = -zfsctl_snapshot_mount(path, 0); |
f1a05fa1 | 170 | if (error) |
d1d7e268 | 171 | return (ERR_PTR(error)); |
f1a05fa1 NB |
172 | |
173 | /* | |
174 | * Rather than returning the new vfsmount for the snapshot we must | |
175 | * return NULL to indicate a mount collision. This is done because | |
176 | * the user space mount calls do_add_mount() which adds the vfsmount | |
177 | * to the name space. If we returned the new mount here it would be | |
178 | * added again to the vfsmount list resulting in list corruption. | |
179 | */ | |
180 | return (NULL); | |
181 | } | |
182 | #endif /* HAVE_AUTOMOUNT */ | |
183 | ||
184 | /* | |
278bee93 BB |
185 | * Negative dentries must always be revalidated so newly created snapshots |
186 | * can be detected and automounted. Normal dentries should be kept because | |
187 | * as of the 3.18 kernel revaliding the mountpoint dentry will result in | |
188 | * the snapshot being immediately unmounted. | |
f1a05fa1 NB |
189 | */ |
190 | static int | |
191 | #ifdef HAVE_D_REVALIDATE_NAMEIDATA | |
192 | zpl_snapdir_revalidate(struct dentry *dentry, struct nameidata *i) | |
193 | #else | |
194 | zpl_snapdir_revalidate(struct dentry *dentry, unsigned int flags) | |
195 | #endif | |
196 | { | |
278bee93 | 197 | return (!!dentry->d_inode); |
f1a05fa1 NB |
198 | } |
199 | ||
200 | dentry_operations_t zpl_dops_snapdirs = { | |
201 | /* | |
202 | * Auto mounting of snapshots is only supported for 2.6.37 and | |
203 | * newer kernels. Prior to this kernel the ops->follow_link() | |
204 | * callback was used as a hack to trigger the mount. The | |
205 | * resulting vfsmount was then explicitly grafted in to the | |
206 | * name space. While it might be possible to add compatibility | |
207 | * code to accomplish this it would require considerable care. | |
208 | */ | |
209 | #ifdef HAVE_AUTOMOUNT | |
210 | .d_automount = zpl_snapdir_automount, | |
211 | #endif /* HAVE_AUTOMOUNT */ | |
212 | .d_revalidate = zpl_snapdir_revalidate, | |
213 | }; | |
214 | ||
ebe7e575 | 215 | static struct dentry * |
8f195a90 | 216 | #ifdef HAVE_LOOKUP_NAMEIDATA |
ebe7e575 BB |
217 | zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry, |
218 | struct nameidata *nd) | |
8f195a90 YS |
219 | #else |
220 | zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry, | |
221 | unsigned int flags) | |
222 | #endif | |
223 | ||
ebe7e575 | 224 | { |
7fad6290 | 225 | fstrans_cookie_t cookie; |
ebe7e575 | 226 | cred_t *cr = CRED(); |
f1a05fa1 | 227 | struct inode *ip = NULL; |
ebe7e575 BB |
228 | int error; |
229 | ||
230 | crhold(cr); | |
7fad6290 | 231 | cookie = spl_fstrans_mark(); |
ebe7e575 BB |
232 | error = -zfsctl_snapdir_lookup(dip, dname(dentry), &ip, |
233 | 0, cr, NULL, NULL); | |
234 | ASSERT3S(error, <=, 0); | |
7fad6290 | 235 | spl_fstrans_unmark(cookie); |
ebe7e575 BB |
236 | crfree(cr); |
237 | ||
f1a05fa1 | 238 | if (error && error != -ENOENT) |
d1d7e268 | 239 | return (ERR_PTR(error)); |
ebe7e575 | 240 | |
f1a05fa1 | 241 | ASSERT(error == 0 || ip == NULL); |
bf01b5e6 | 242 | d_clear_d_op(dentry); |
f1a05fa1 | 243 | d_set_d_op(dentry, &zpl_dops_snapdirs); |
278bee93 BB |
244 | #ifdef HAVE_AUTOMOUNT |
245 | dentry->d_flags |= DCACHE_NEED_AUTOMOUNT; | |
246 | #endif | |
ebe7e575 | 247 | |
d1d7e268 | 248 | return (d_splice_alias(ip, dentry)); |
ebe7e575 BB |
249 | } |
250 | ||
ebe7e575 | 251 | static int |
9464b959 | 252 | zpl_snapdir_iterate(struct file *filp, zpl_dir_context_t *ctx) |
ebe7e575 | 253 | { |
0037b49e | 254 | zfsvfs_t *zfsvfs = ITOZSB(file_inode(filp)); |
7fad6290 | 255 | fstrans_cookie_t cookie; |
ebe7e575 | 256 | char snapname[MAXNAMELEN]; |
ebe7e575 | 257 | boolean_t case_conflict; |
7fad6290 | 258 | uint64_t id, pos; |
ebe7e575 BB |
259 | int error = 0; |
260 | ||
0037b49e | 261 | ZFS_ENTER(zfsvfs); |
7fad6290 | 262 | cookie = spl_fstrans_mark(); |
ebe7e575 | 263 | |
9464b959 | 264 | if (!zpl_dir_emit_dots(filp, ctx)) |
0f37d0c8 | 265 | goto out; |
ebe7e575 | 266 | |
7fad6290 | 267 | pos = ctx->pos; |
0f37d0c8 | 268 | while (error == 0) { |
0037b49e BB |
269 | dsl_pool_config_enter(dmu_objset_pool(zfsvfs->z_os), FTAG); |
270 | error = -dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, | |
7fad6290 | 271 | snapname, &id, &pos, &case_conflict); |
0037b49e | 272 | dsl_pool_config_exit(dmu_objset_pool(zfsvfs->z_os), FTAG); |
ebe7e575 BB |
273 | if (error) |
274 | goto out; | |
275 | ||
9464b959 | 276 | if (!zpl_dir_emit(ctx, snapname, strlen(snapname), |
0f37d0c8 RY |
277 | ZFSCTL_INO_SHARES - id, DT_DIR)) |
278 | goto out; | |
5f15fa22 | 279 | |
7fad6290 | 280 | ctx->pos = pos; |
ebe7e575 BB |
281 | } |
282 | out: | |
7fad6290 | 283 | spl_fstrans_unmark(cookie); |
0037b49e | 284 | ZFS_EXIT(zfsvfs); |
ebe7e575 BB |
285 | |
286 | if (error == -ENOENT) | |
287 | return (0); | |
288 | ||
289 | return (error); | |
290 | } | |
291 | ||
9baaa7de | 292 | #if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED) |
0f37d0c8 RY |
293 | static int |
294 | zpl_snapdir_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
295 | { | |
9464b959 BB |
296 | zpl_dir_context_t ctx = |
297 | ZPL_DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos); | |
0f37d0c8 RY |
298 | int error; |
299 | ||
300 | error = zpl_snapdir_iterate(filp, &ctx); | |
301 | filp->f_pos = ctx.pos; | |
302 | ||
303 | return (error); | |
304 | } | |
9464b959 | 305 | #endif /* !HAVE_VFS_ITERATE && !HAVE_VFS_ITERATE_SHARED */ |
0f37d0c8 | 306 | |
b8d9e264 CC |
307 | static int |
308 | zpl_snapdir_rename2(struct inode *sdip, struct dentry *sdentry, | |
309 | struct inode *tdip, struct dentry *tdentry, unsigned int flags) | |
ebe7e575 BB |
310 | { |
311 | cred_t *cr = CRED(); | |
312 | int error; | |
313 | ||
b8d9e264 CC |
314 | /* We probably don't want to support renameat2(2) in ctldir */ |
315 | if (flags) | |
316 | return (-EINVAL); | |
317 | ||
ebe7e575 BB |
318 | crhold(cr); |
319 | error = -zfsctl_snapdir_rename(sdip, dname(sdentry), | |
320 | tdip, dname(tdentry), cr, 0); | |
321 | ASSERT3S(error, <=, 0); | |
322 | crfree(cr); | |
323 | ||
324 | return (error); | |
325 | } | |
326 | ||
b8d9e264 CC |
327 | #ifndef HAVE_RENAME_WANTS_FLAGS |
328 | static int | |
329 | zpl_snapdir_rename(struct inode *sdip, struct dentry *sdentry, | |
330 | struct inode *tdip, struct dentry *tdentry) | |
331 | { | |
332 | return (zpl_snapdir_rename2(sdip, sdentry, tdip, tdentry, 0)); | |
333 | } | |
334 | #endif | |
335 | ||
ebe7e575 BB |
336 | static int |
337 | zpl_snapdir_rmdir(struct inode *dip, struct dentry *dentry) | |
338 | { | |
339 | cred_t *cr = CRED(); | |
340 | int error; | |
341 | ||
342 | crhold(cr); | |
343 | error = -zfsctl_snapdir_remove(dip, dname(dentry), cr, 0); | |
344 | ASSERT3S(error, <=, 0); | |
345 | crfree(cr); | |
346 | ||
347 | return (error); | |
348 | } | |
349 | ||
350 | static int | |
b39d3b9f | 351 | zpl_snapdir_mkdir(struct inode *dip, struct dentry *dentry, zpl_umode_t mode) |
ebe7e575 BB |
352 | { |
353 | cred_t *cr = CRED(); | |
354 | vattr_t *vap; | |
355 | struct inode *ip; | |
356 | int error; | |
357 | ||
358 | crhold(cr); | |
d1d7e268 | 359 | vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP); |
7b3e34ba | 360 | zpl_vap_init(vap, dip, mode | S_IFDIR, cr); |
ebe7e575 BB |
361 | |
362 | error = -zfsctl_snapdir_mkdir(dip, dname(dentry), vap, &ip, cr, 0); | |
363 | if (error == 0) { | |
bf01b5e6 | 364 | d_clear_d_op(dentry); |
f1a05fa1 | 365 | d_set_d_op(dentry, &zpl_dops_snapdirs); |
ebe7e575 BB |
366 | d_instantiate(dentry, ip); |
367 | } | |
368 | ||
d1d7e268 | 369 | kmem_free(vap, sizeof (vattr_t)); |
ebe7e575 BB |
370 | ASSERT3S(error, <=, 0); |
371 | crfree(cr); | |
372 | ||
373 | return (error); | |
374 | } | |
375 | ||
ebe7e575 BB |
376 | /* |
377 | * Get snapshot directory attributes. | |
378 | */ | |
379 | /* ARGSUSED */ | |
380 | static int | |
a3478c07 OF |
381 | zpl_snapdir_getattr_impl(const struct path *path, struct kstat *stat, |
382 | u32 request_mask, unsigned int query_flags) | |
ebe7e575 | 383 | { |
2946a1a1 BB |
384 | struct inode *ip = path->dentry->d_inode; |
385 | zfsvfs_t *zfsvfs = ITOZSB(ip); | |
ebe7e575 | 386 | |
0037b49e | 387 | ZFS_ENTER(zfsvfs); |
2946a1a1 | 388 | generic_fillattr(ip, stat); |
a3478c07 | 389 | |
278bee93 | 390 | stat->nlink = stat->size = 2; |
0037b49e | 391 | stat->ctime = stat->mtime = dmu_objset_snap_cmtime(zfsvfs->z_os); |
2946a1a1 | 392 | stat->atime = current_time(ip); |
0037b49e | 393 | ZFS_EXIT(zfsvfs); |
ebe7e575 | 394 | |
a3478c07 | 395 | return (0); |
ebe7e575 | 396 | } |
a3478c07 | 397 | ZPL_GETATTR_WRAPPER(zpl_snapdir_getattr); |
ebe7e575 BB |
398 | |
399 | /* | |
400 | * The '.zfs/snapshot' directory file operations. These mainly control | |
401 | * generating the list of available snapshots when doing an 'ls' in the | |
402 | * directory. See zpl_snapdir_readdir(). | |
403 | */ | |
404 | const struct file_operations zpl_fops_snapdir = { | |
405 | .open = zpl_common_open, | |
406 | .llseek = generic_file_llseek, | |
407 | .read = generic_read_dir, | |
9baaa7de CC |
408 | #ifdef HAVE_VFS_ITERATE_SHARED |
409 | .iterate_shared = zpl_snapdir_iterate, | |
410 | #elif defined(HAVE_VFS_ITERATE) | |
0f37d0c8 RY |
411 | .iterate = zpl_snapdir_iterate, |
412 | #else | |
ebe7e575 | 413 | .readdir = zpl_snapdir_readdir, |
0f37d0c8 RY |
414 | #endif |
415 | ||
ebe7e575 BB |
416 | }; |
417 | ||
418 | /* | |
419 | * The '.zfs/snapshot' directory inode operations. These mainly control | |
420 | * creating an inode for a snapshot directory and initializing the needed | |
421 | * infrastructure to automount the snapshot. See zpl_snapdir_lookup(). | |
422 | */ | |
423 | const struct inode_operations zpl_ops_snapdir = { | |
424 | .lookup = zpl_snapdir_lookup, | |
425 | .getattr = zpl_snapdir_getattr, | |
b8d9e264 CC |
426 | #ifdef HAVE_RENAME_WANTS_FLAGS |
427 | .rename = zpl_snapdir_rename2, | |
428 | #else | |
ebe7e575 | 429 | .rename = zpl_snapdir_rename, |
b8d9e264 | 430 | #endif |
ebe7e575 BB |
431 | .rmdir = zpl_snapdir_rmdir, |
432 | .mkdir = zpl_snapdir_mkdir, | |
433 | }; | |
434 | ||
ebe7e575 | 435 | static struct dentry * |
8f195a90 | 436 | #ifdef HAVE_LOOKUP_NAMEIDATA |
ebe7e575 BB |
437 | zpl_shares_lookup(struct inode *dip, struct dentry *dentry, |
438 | struct nameidata *nd) | |
8f195a90 YS |
439 | #else |
440 | zpl_shares_lookup(struct inode *dip, struct dentry *dentry, | |
441 | unsigned int flags) | |
442 | #endif | |
ebe7e575 | 443 | { |
7fad6290 | 444 | fstrans_cookie_t cookie; |
ebe7e575 BB |
445 | cred_t *cr = CRED(); |
446 | struct inode *ip = NULL; | |
447 | int error; | |
448 | ||
449 | crhold(cr); | |
7fad6290 | 450 | cookie = spl_fstrans_mark(); |
ebe7e575 BB |
451 | error = -zfsctl_shares_lookup(dip, dname(dentry), &ip, |
452 | 0, cr, NULL, NULL); | |
453 | ASSERT3S(error, <=, 0); | |
7fad6290 | 454 | spl_fstrans_unmark(cookie); |
ebe7e575 BB |
455 | crfree(cr); |
456 | ||
457 | if (error) { | |
458 | if (error == -ENOENT) | |
d1d7e268 | 459 | return (d_splice_alias(NULL, dentry)); |
ebe7e575 | 460 | else |
d1d7e268 | 461 | return (ERR_PTR(error)); |
ebe7e575 BB |
462 | } |
463 | ||
d1d7e268 | 464 | return (d_splice_alias(ip, dentry)); |
ebe7e575 BB |
465 | } |
466 | ||
ebe7e575 | 467 | static int |
9464b959 | 468 | zpl_shares_iterate(struct file *filp, zpl_dir_context_t *ctx) |
ebe7e575 | 469 | { |
7fad6290 | 470 | fstrans_cookie_t cookie; |
ebe7e575 | 471 | cred_t *cr = CRED(); |
0037b49e | 472 | zfsvfs_t *zfsvfs = ITOZSB(file_inode(filp)); |
ebe7e575 | 473 | znode_t *dzp; |
0f37d0c8 | 474 | int error = 0; |
ebe7e575 | 475 | |
0037b49e | 476 | ZFS_ENTER(zfsvfs); |
7fad6290 | 477 | cookie = spl_fstrans_mark(); |
ebe7e575 | 478 | |
0037b49e | 479 | if (zfsvfs->z_shares_dir == 0) { |
9464b959 | 480 | zpl_dir_emit_dots(filp, ctx); |
0f37d0c8 | 481 | goto out; |
ebe7e575 BB |
482 | } |
483 | ||
0037b49e | 484 | error = -zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp); |
0f37d0c8 RY |
485 | if (error) |
486 | goto out; | |
ebe7e575 BB |
487 | |
488 | crhold(cr); | |
0f37d0c8 | 489 | error = -zfs_readdir(ZTOI(dzp), ctx, cr); |
ebe7e575 BB |
490 | crfree(cr); |
491 | ||
492 | iput(ZTOI(dzp)); | |
0f37d0c8 | 493 | out: |
7fad6290 | 494 | spl_fstrans_unmark(cookie); |
0037b49e | 495 | ZFS_EXIT(zfsvfs); |
ebe7e575 BB |
496 | ASSERT3S(error, <=, 0); |
497 | ||
498 | return (error); | |
499 | } | |
500 | ||
9baaa7de | 501 | #if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED) |
0f37d0c8 RY |
502 | static int |
503 | zpl_shares_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
504 | { | |
9464b959 BB |
505 | zpl_dir_context_t ctx = |
506 | ZPL_DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos); | |
0f37d0c8 RY |
507 | int error; |
508 | ||
509 | error = zpl_shares_iterate(filp, &ctx); | |
510 | filp->f_pos = ctx.pos; | |
511 | ||
512 | return (error); | |
513 | } | |
9464b959 | 514 | #endif /* !HAVE_VFS_ITERATE && !HAVE_VFS_ITERATE_SHARED */ |
0f37d0c8 | 515 | |
ebe7e575 BB |
516 | /* ARGSUSED */ |
517 | static int | |
a3478c07 OF |
518 | zpl_shares_getattr_impl(const struct path *path, struct kstat *stat, |
519 | u32 request_mask, unsigned int query_flags) | |
ebe7e575 | 520 | { |
a3478c07 | 521 | struct inode *ip = path->dentry->d_inode; |
0037b49e | 522 | zfsvfs_t *zfsvfs = ITOZSB(ip); |
ebe7e575 BB |
523 | znode_t *dzp; |
524 | int error; | |
525 | ||
0037b49e | 526 | ZFS_ENTER(zfsvfs); |
ebe7e575 | 527 | |
0037b49e | 528 | if (zfsvfs->z_shares_dir == 0) { |
a3478c07 | 529 | generic_fillattr(path->dentry->d_inode, stat); |
ebe7e575 | 530 | stat->nlink = stat->size = 2; |
2946a1a1 | 531 | stat->atime = current_time(ip); |
0037b49e | 532 | ZFS_EXIT(zfsvfs); |
a3478c07 | 533 | return (0); |
ebe7e575 BB |
534 | } |
535 | ||
0037b49e | 536 | error = -zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp); |
90ee9ed3 BB |
537 | if (error == 0) { |
538 | error = -zfs_getattr_fast(ZTOI(dzp), stat); | |
539 | iput(ZTOI(dzp)); | |
540 | } | |
ebe7e575 | 541 | |
0037b49e | 542 | ZFS_EXIT(zfsvfs); |
ebe7e575 BB |
543 | ASSERT3S(error, <=, 0); |
544 | ||
545 | return (error); | |
546 | } | |
a3478c07 | 547 | ZPL_GETATTR_WRAPPER(zpl_shares_getattr); |
ebe7e575 BB |
548 | |
549 | /* | |
550 | * The '.zfs/shares' directory file operations. | |
551 | */ | |
552 | const struct file_operations zpl_fops_shares = { | |
553 | .open = zpl_common_open, | |
554 | .llseek = generic_file_llseek, | |
555 | .read = generic_read_dir, | |
9baaa7de CC |
556 | #ifdef HAVE_VFS_ITERATE_SHARED |
557 | .iterate_shared = zpl_shares_iterate, | |
558 | #elif defined(HAVE_VFS_ITERATE) | |
0f37d0c8 RY |
559 | .iterate = zpl_shares_iterate, |
560 | #else | |
ebe7e575 | 561 | .readdir = zpl_shares_readdir, |
0f37d0c8 RY |
562 | #endif |
563 | ||
ebe7e575 BB |
564 | }; |
565 | ||
566 | /* | |
567 | * The '.zfs/shares' directory inode operations. | |
568 | */ | |
569 | const struct inode_operations zpl_ops_shares = { | |
570 | .lookup = zpl_shares_lookup, | |
571 | .getattr = zpl_shares_getattr, | |
572 | }; |