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ee154f01 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 | */ | |
24 | ||
25 | ||
26 | #include <sys/zfs_vfsops.h> | |
27 | #include <sys/zfs_vnops.h> | |
ebe7e575 | 28 | #include <sys/zfs_znode.h> |
ee154f01 BB |
29 | #include <sys/vfs.h> |
30 | #include <sys/zpl.h> | |
31 | ||
32 | ||
33 | static struct dentry * | |
8f195a90 | 34 | #ifdef HAVE_LOOKUP_NAMEIDATA |
ee154f01 | 35 | zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
8f195a90 YS |
36 | #else |
37 | zpl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) | |
38 | #endif | |
ee154f01 | 39 | { |
81e97e21 | 40 | cred_t *cr = CRED(); |
ee154f01 | 41 | struct inode *ip; |
ee154f01 BB |
42 | int error; |
43 | ||
9878a89d BB |
44 | if (dlen(dentry) > ZFS_MAXNAMELEN) |
45 | return ERR_PTR(-ENAMETOOLONG); | |
46 | ||
81e97e21 | 47 | crhold(cr); |
ee154f01 BB |
48 | error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL); |
49 | ASSERT3S(error, <=, 0); | |
81e97e21 | 50 | crfree(cr); |
ee154f01 | 51 | |
7b3e34ba BB |
52 | spin_lock(&dentry->d_lock); |
53 | dentry->d_time = jiffies; | |
ee930353 BB |
54 | #ifndef HAVE_S_D_OP |
55 | d_set_d_op(dentry, &zpl_dentry_operations); | |
56 | #endif /* HAVE_S_D_OP */ | |
7b3e34ba BB |
57 | spin_unlock(&dentry->d_lock); |
58 | ||
ee154f01 BB |
59 | if (error) { |
60 | if (error == -ENOENT) | |
61 | return d_splice_alias(NULL, dentry); | |
62 | else | |
63 | return ERR_PTR(error); | |
64 | } | |
65 | ||
66 | return d_splice_alias(ip, dentry); | |
67 | } | |
68 | ||
ebe7e575 | 69 | void |
7b3e34ba | 70 | zpl_vap_init(vattr_t *vap, struct inode *dir, zpl_umode_t mode, cred_t *cr) |
9fd91dae BB |
71 | { |
72 | vap->va_mask = ATTR_MODE; | |
73 | vap->va_mode = mode; | |
9fd91dae BB |
74 | vap->va_uid = crgetfsuid(cr); |
75 | ||
76 | if (dir && dir->i_mode & S_ISGID) { | |
77 | vap->va_gid = dir->i_gid; | |
78 | if (S_ISDIR(mode)) | |
79 | vap->va_mode |= S_ISGID; | |
80 | } else { | |
81 | vap->va_gid = crgetfsgid(cr); | |
82 | } | |
83 | } | |
84 | ||
ee154f01 | 85 | static int |
558ef6d0 | 86 | #ifdef HAVE_CREATE_NAMEIDATA |
b39d3b9f | 87 | zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode, |
ee154f01 | 88 | struct nameidata *nd) |
558ef6d0 YS |
89 | #else |
90 | zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode, | |
91 | bool flag) | |
92 | #endif | |
ee154f01 | 93 | { |
81e97e21 | 94 | cred_t *cr = CRED(); |
ee154f01 BB |
95 | struct inode *ip; |
96 | vattr_t *vap; | |
97 | int error; | |
98 | ||
81e97e21 | 99 | crhold(cr); |
ee154f01 | 100 | vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); |
7b3e34ba | 101 | zpl_vap_init(vap, dir, mode, cr); |
ee154f01 | 102 | |
e89260a1 BB |
103 | error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL); |
104 | if (error == 0) { | |
105 | error = zpl_xattr_security_init(ip, dir, &dentry->d_name); | |
106 | VERIFY3S(error, ==, 0); | |
7b3e34ba | 107 | d_instantiate(dentry, ip); |
e89260a1 BB |
108 | } |
109 | ||
ee154f01 | 110 | kmem_free(vap, sizeof(vattr_t)); |
81e97e21 | 111 | crfree(cr); |
ee154f01 BB |
112 | ASSERT3S(error, <=, 0); |
113 | ||
114 | return (error); | |
115 | } | |
116 | ||
117 | static int | |
b39d3b9f BB |
118 | zpl_mknod(struct inode *dir, struct dentry *dentry, zpl_umode_t mode, |
119 | dev_t rdev) | |
ee154f01 | 120 | { |
81e97e21 | 121 | cred_t *cr = CRED(); |
ee154f01 BB |
122 | struct inode *ip; |
123 | vattr_t *vap; | |
124 | int error; | |
125 | ||
aa6d8c10 NB |
126 | /* |
127 | * We currently expect Linux to supply rdev=0 for all sockets | |
128 | * and fifos, but we want to know if this behavior ever changes. | |
129 | */ | |
130 | if (S_ISSOCK(mode) || S_ISFIFO(mode)) | |
131 | ASSERT(rdev == 0); | |
132 | ||
81e97e21 | 133 | crhold(cr); |
ee154f01 | 134 | vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); |
7b3e34ba | 135 | zpl_vap_init(vap, dir, mode, cr); |
ee154f01 | 136 | vap->va_rdev = rdev; |
ee154f01 | 137 | |
7b3e34ba | 138 | error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL); |
ee930353 | 139 | if (error == 0) |
7b3e34ba | 140 | d_instantiate(dentry, ip); |
7b3e34ba | 141 | |
ee154f01 | 142 | kmem_free(vap, sizeof(vattr_t)); |
81e97e21 | 143 | crfree(cr); |
ee154f01 BB |
144 | ASSERT3S(error, <=, 0); |
145 | ||
146 | return (-error); | |
147 | } | |
148 | ||
149 | static int | |
150 | zpl_unlink(struct inode *dir, struct dentry *dentry) | |
151 | { | |
81e97e21 | 152 | cred_t *cr = CRED(); |
ee154f01 BB |
153 | int error; |
154 | ||
81e97e21 | 155 | crhold(cr); |
ee154f01 | 156 | error = -zfs_remove(dir, dname(dentry), cr); |
81e97e21 | 157 | crfree(cr); |
ee154f01 BB |
158 | ASSERT3S(error, <=, 0); |
159 | ||
160 | return (error); | |
161 | } | |
162 | ||
163 | static int | |
b39d3b9f | 164 | zpl_mkdir(struct inode *dir, struct dentry *dentry, zpl_umode_t mode) |
ee154f01 | 165 | { |
81e97e21 | 166 | cred_t *cr = CRED(); |
ee154f01 BB |
167 | vattr_t *vap; |
168 | struct inode *ip; | |
169 | int error; | |
170 | ||
81e97e21 | 171 | crhold(cr); |
ee154f01 | 172 | vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); |
7b3e34ba | 173 | zpl_vap_init(vap, dir, mode | S_IFDIR, cr); |
ee154f01 BB |
174 | |
175 | error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL); | |
ee930353 | 176 | if (error == 0) |
7b3e34ba | 177 | d_instantiate(dentry, ip); |
7b3e34ba | 178 | |
ee154f01 | 179 | kmem_free(vap, sizeof(vattr_t)); |
81e97e21 | 180 | crfree(cr); |
ee154f01 BB |
181 | ASSERT3S(error, <=, 0); |
182 | ||
183 | return (error); | |
184 | } | |
185 | ||
186 | static int | |
187 | zpl_rmdir(struct inode * dir, struct dentry *dentry) | |
188 | { | |
81e97e21 | 189 | cred_t *cr = CRED(); |
ee154f01 BB |
190 | int error; |
191 | ||
81e97e21 | 192 | crhold(cr); |
ee154f01 | 193 | error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0); |
81e97e21 | 194 | crfree(cr); |
ee154f01 BB |
195 | ASSERT3S(error, <=, 0); |
196 | ||
197 | return (error); | |
198 | } | |
199 | ||
200 | static int | |
201 | zpl_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
202 | { | |
ebe7e575 | 203 | boolean_t issnap = ITOZSB(dentry->d_inode)->z_issnap; |
ee154f01 BB |
204 | int error; |
205 | ||
ebe7e575 BB |
206 | /* |
207 | * Ensure MNT_SHRINKABLE is set on snapshots to ensure they are | |
208 | * unmounted automatically with the parent file system. This | |
209 | * is done on the first getattr because it's not easy to get the | |
210 | * vfsmount structure at mount time. This call path is explicitly | |
211 | * marked unlikely to avoid any performance impact. FWIW, ext4 | |
212 | * resorts to a similar trick for sysadmin convenience. | |
213 | */ | |
214 | if (unlikely(issnap && !(mnt->mnt_flags & MNT_SHRINKABLE))) | |
215 | mnt->mnt_flags |= MNT_SHRINKABLE; | |
216 | ||
057e8eee | 217 | error = -zfs_getattr_fast(dentry->d_inode, stat); |
ee154f01 BB |
218 | ASSERT3S(error, <=, 0); |
219 | ||
220 | return (error); | |
221 | } | |
222 | ||
223 | static int | |
5484965a | 224 | zpl_setattr(struct dentry *dentry, struct iattr *ia) |
ee154f01 | 225 | { |
81e97e21 | 226 | cred_t *cr = CRED(); |
5484965a | 227 | vattr_t *vap; |
ee154f01 BB |
228 | int error; |
229 | ||
5484965a | 230 | error = inode_change_ok(dentry->d_inode, ia); |
ee154f01 BB |
231 | if (error) |
232 | return (error); | |
233 | ||
81e97e21 | 234 | crhold(cr); |
5484965a BB |
235 | vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); |
236 | vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK; | |
237 | vap->va_mode = ia->ia_mode; | |
238 | vap->va_uid = ia->ia_uid; | |
239 | vap->va_gid = ia->ia_gid; | |
240 | vap->va_size = ia->ia_size; | |
241 | vap->va_atime = ia->ia_atime; | |
242 | vap->va_mtime = ia->ia_mtime; | |
243 | vap->va_ctime = ia->ia_ctime; | |
244 | ||
245 | error = -zfs_setattr(dentry->d_inode, vap, 0, cr); | |
246 | ||
247 | kmem_free(vap, sizeof(vattr_t)); | |
81e97e21 | 248 | crfree(cr); |
ee154f01 BB |
249 | ASSERT3S(error, <=, 0); |
250 | ||
5484965a | 251 | return (error); |
ee154f01 BB |
252 | } |
253 | ||
254 | static int | |
255 | zpl_rename(struct inode *sdip, struct dentry *sdentry, | |
256 | struct inode *tdip, struct dentry *tdentry) | |
257 | { | |
81e97e21 | 258 | cred_t *cr = CRED(); |
ee154f01 BB |
259 | int error; |
260 | ||
81e97e21 | 261 | crhold(cr); |
ee154f01 | 262 | error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0); |
81e97e21 | 263 | crfree(cr); |
ee154f01 BB |
264 | ASSERT3S(error, <=, 0); |
265 | ||
266 | return (error); | |
267 | } | |
268 | ||
269 | static int | |
270 | zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name) | |
271 | { | |
81e97e21 | 272 | cred_t *cr = CRED(); |
ee154f01 BB |
273 | vattr_t *vap; |
274 | struct inode *ip; | |
275 | int error; | |
276 | ||
81e97e21 | 277 | crhold(cr); |
ee154f01 | 278 | vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); |
7b3e34ba | 279 | zpl_vap_init(vap, dir, S_IFLNK | S_IRWXUGO, cr); |
ee154f01 BB |
280 | |
281 | error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0); | |
ee930353 | 282 | if (error == 0) |
7b3e34ba | 283 | d_instantiate(dentry, ip); |
7b3e34ba | 284 | |
ee154f01 | 285 | kmem_free(vap, sizeof(vattr_t)); |
81e97e21 | 286 | crfree(cr); |
ee154f01 BB |
287 | ASSERT3S(error, <=, 0); |
288 | ||
289 | return (error); | |
290 | } | |
291 | ||
292 | static void * | |
293 | zpl_follow_link(struct dentry *dentry, struct nameidata *nd) | |
294 | { | |
81e97e21 | 295 | cred_t *cr = CRED(); |
8b4f9a2d BB |
296 | struct inode *ip = dentry->d_inode; |
297 | struct iovec iov; | |
298 | uio_t uio; | |
299 | char *link; | |
8b4f9a2d BB |
300 | int error; |
301 | ||
81e97e21 | 302 | crhold(cr); |
8b4f9a2d BB |
303 | |
304 | iov.iov_len = MAXPATHLEN; | |
305 | iov.iov_base = link = kmem_zalloc(MAXPATHLEN, KM_SLEEP); | |
306 | ||
307 | uio.uio_iov = &iov; | |
308 | uio.uio_iovcnt = 1; | |
309 | uio.uio_resid = (MAXPATHLEN - 1); | |
310 | uio.uio_segflg = UIO_SYSSPACE; | |
311 | ||
50950001 | 312 | error = -zfs_readlink(ip, &uio, cr); |
8b4f9a2d BB |
313 | if (error) { |
314 | kmem_free(link, MAXPATHLEN); | |
315 | nd_set_link(nd, ERR_PTR(error)); | |
316 | } else { | |
317 | nd_set_link(nd, link); | |
318 | } | |
319 | ||
81e97e21 | 320 | crfree(cr); |
8b4f9a2d | 321 | return (NULL); |
ee154f01 BB |
322 | } |
323 | ||
324 | static void | |
325 | zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
326 | { | |
0a6b03d3 | 327 | const char *link = nd_get_link(nd); |
ee154f01 | 328 | |
ee154f01 | 329 | if (!IS_ERR(link)) |
8b4f9a2d | 330 | kmem_free(link, MAXPATHLEN); |
ee154f01 BB |
331 | } |
332 | ||
333 | static int | |
334 | zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
335 | { | |
81e97e21 | 336 | cred_t *cr = CRED(); |
ee154f01 | 337 | struct inode *ip = old_dentry->d_inode; |
ee154f01 BB |
338 | int error; |
339 | ||
340 | if (ip->i_nlink >= ZFS_LINK_MAX) | |
341 | return -EMLINK; | |
342 | ||
81e97e21 | 343 | crhold(cr); |
ee154f01 BB |
344 | ip->i_ctime = CURRENT_TIME_SEC; |
345 | igrab(ip); /* Use ihold() if available */ | |
346 | ||
347 | error = -zfs_link(dir, ip, dname(dentry), cr); | |
348 | if (error) { | |
349 | iput(ip); | |
350 | goto out; | |
351 | } | |
352 | ||
353 | d_instantiate(dentry, ip); | |
354 | out: | |
81e97e21 | 355 | crfree(cr); |
ee154f01 BB |
356 | ASSERT3S(error, <=, 0); |
357 | ||
358 | return (error); | |
359 | } | |
360 | ||
ea1fdf46 | 361 | #ifdef HAVE_INODE_TRUNCATE_RANGE |
5cb63a57 ED |
362 | static void |
363 | zpl_truncate_range(struct inode* ip, loff_t start, loff_t end) | |
364 | { | |
365 | cred_t *cr = CRED(); | |
366 | flock64_t bf; | |
367 | ||
368 | ASSERT3S(start, <=, end); | |
369 | ||
370 | /* | |
371 | * zfs_freesp() will interpret (len == 0) as meaning "truncate until | |
372 | * the end of the file". We don't want that. | |
373 | */ | |
374 | if (start == end) | |
375 | return; | |
376 | ||
377 | crhold(cr); | |
378 | ||
379 | bf.l_type = F_WRLCK; | |
380 | bf.l_whence = 0; | |
381 | bf.l_start = start; | |
382 | bf.l_len = end - start; | |
383 | bf.l_pid = 0; | |
384 | zfs_space(ip, F_FREESP, &bf, FWRITE, start, cr); | |
385 | ||
386 | crfree(cr); | |
387 | } | |
ea1fdf46 | 388 | #endif /* HAVE_INODE_TRUNCATE_RANGE */ |
5cb63a57 | 389 | |
cb2d1901 ED |
390 | #ifdef HAVE_INODE_FALLOCATE |
391 | static long | |
392 | zpl_fallocate(struct inode *ip, int mode, loff_t offset, loff_t len) | |
393 | { | |
394 | return zpl_fallocate_common(ip, mode, offset, len); | |
395 | } | |
396 | #endif /* HAVE_INODE_FALLOCATE */ | |
397 | ||
7b3e34ba BB |
398 | static int |
399 | #ifdef HAVE_D_REVALIDATE_NAMEIDATA | |
400 | zpl_revalidate(struct dentry *dentry, struct nameidata *nd) | |
401 | { | |
09a661e9 | 402 | unsigned int flags = (nd ? nd->flags : 0); |
7b3e34ba BB |
403 | #else |
404 | zpl_revalidate(struct dentry *dentry, unsigned int flags) | |
405 | { | |
406 | #endif /* HAVE_D_REVALIDATE_NAMEIDATA */ | |
407 | zfs_sb_t *zsb = dentry->d_sb->s_fs_info; | |
408 | int error; | |
409 | ||
410 | if (flags & LOOKUP_RCU) | |
411 | return (-ECHILD); | |
412 | ||
413 | /* | |
414 | * After a rollback negative dentries created before the rollback | |
415 | * time must be invalidated. Otherwise they can obscure files which | |
416 | * are only present in the rolled back dataset. | |
417 | */ | |
418 | if (dentry->d_inode == NULL) { | |
419 | spin_lock(&dentry->d_lock); | |
420 | error = time_before(dentry->d_time, zsb->z_rollback_time); | |
421 | spin_unlock(&dentry->d_lock); | |
422 | ||
423 | if (error) | |
424 | return (0); | |
425 | } | |
426 | ||
427 | /* | |
428 | * The dentry may reference a stale inode if a mounted file system | |
429 | * was rolled back to a point in time where the object didn't exist. | |
430 | */ | |
431 | if (dentry->d_inode && ITOZ(dentry->d_inode)->z_is_stale) | |
432 | return (0); | |
433 | ||
434 | return (1); | |
435 | } | |
cb2d1901 | 436 | |
ee154f01 | 437 | const struct inode_operations zpl_inode_operations = { |
ee154f01 BB |
438 | .create = zpl_create, |
439 | .link = zpl_link, | |
440 | .unlink = zpl_unlink, | |
441 | .symlink = zpl_symlink, | |
442 | .mkdir = zpl_mkdir, | |
443 | .rmdir = zpl_rmdir, | |
444 | .mknod = zpl_mknod, | |
445 | .rename = zpl_rename, | |
446 | .setattr = zpl_setattr, | |
447 | .getattr = zpl_getattr, | |
448 | .setxattr = generic_setxattr, | |
449 | .getxattr = generic_getxattr, | |
450 | .removexattr = generic_removexattr, | |
451 | .listxattr = zpl_xattr_list, | |
ea1fdf46 | 452 | #ifdef HAVE_INODE_TRUNCATE_RANGE |
5cb63a57 | 453 | .truncate_range = zpl_truncate_range, |
ea1fdf46 | 454 | #endif /* HAVE_INODE_TRUNCATE_RANGE */ |
cb2d1901 ED |
455 | #ifdef HAVE_INODE_FALLOCATE |
456 | .fallocate = zpl_fallocate, | |
457 | #endif /* HAVE_INODE_FALLOCATE */ | |
ee154f01 BB |
458 | }; |
459 | ||
460 | const struct inode_operations zpl_dir_inode_operations = { | |
ee154f01 BB |
461 | .create = zpl_create, |
462 | .lookup = zpl_lookup, | |
463 | .link = zpl_link, | |
464 | .unlink = zpl_unlink, | |
465 | .symlink = zpl_symlink, | |
466 | .mkdir = zpl_mkdir, | |
467 | .rmdir = zpl_rmdir, | |
468 | .mknod = zpl_mknod, | |
469 | .rename = zpl_rename, | |
470 | .setattr = zpl_setattr, | |
a6695d83 BB |
471 | .getattr = zpl_getattr, |
472 | .setxattr = generic_setxattr, | |
473 | .getxattr = generic_getxattr, | |
474 | .removexattr = generic_removexattr, | |
475 | .listxattr = zpl_xattr_list, | |
ee154f01 BB |
476 | }; |
477 | ||
478 | const struct inode_operations zpl_symlink_inode_operations = { | |
ee154f01 BB |
479 | .readlink = generic_readlink, |
480 | .follow_link = zpl_follow_link, | |
481 | .put_link = zpl_put_link, | |
6f2255ba BB |
482 | .setattr = zpl_setattr, |
483 | .getattr = zpl_getattr, | |
f31b3ebe BB |
484 | .setxattr = generic_setxattr, |
485 | .getxattr = generic_getxattr, | |
486 | .removexattr = generic_removexattr, | |
487 | .listxattr = zpl_xattr_list, | |
ee154f01 BB |
488 | }; |
489 | ||
490 | const struct inode_operations zpl_special_inode_operations = { | |
a6695d83 BB |
491 | .setattr = zpl_setattr, |
492 | .getattr = zpl_getattr, | |
493 | .setxattr = generic_setxattr, | |
494 | .getxattr = generic_getxattr, | |
495 | .removexattr = generic_removexattr, | |
496 | .listxattr = zpl_xattr_list, | |
ee154f01 | 497 | }; |
7b3e34ba BB |
498 | |
499 | dentry_operations_t zpl_dentry_operations = { | |
500 | .d_revalidate = zpl_revalidate, | |
501 | }; |