1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_mount.h"
13 #include "xfs_inode.h"
14 #include "xfs_acl.h"
15 #include "xfs_quota.h"
16 #include "xfs_attr.h"
17 #include "xfs_trans.h"
18 #include "xfs_trace.h"
19 #include "xfs_icache.h"
20 #include "xfs_symlink.h"
21 #include "xfs_dir2.h"
22 #include "xfs_iomap.h"
23 #include "xfs_error.h"
24
25 #include <linux/posix_acl.h>
26 #include <linux/security.h>
27 #include <linux/iversion.h>
28 #include <linux/fiemap.h>
29
30 /*
31 * Directories have different lock order w.r.t. mmap_lock compared to regular
32 * files. This is due to readdir potentially triggering page faults on a user
33 * buffer inside filldir(), and this happens with the ilock on the directory
34 * held. For regular files, the lock order is the other way around - the
35 * mmap_lock is taken during the page fault, and then we lock the ilock to do
36 * block mapping. Hence we need a different class for the directory ilock so
37 * that lockdep can tell them apart.
38 */
39 static struct lock_class_key xfs_nondir_ilock_class;
40 static struct lock_class_key xfs_dir_ilock_class;
41
42 static int
xfs_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)43 xfs_initxattrs(
44 struct inode *inode,
45 const struct xattr *xattr_array,
46 void *fs_info)
47 {
48 const struct xattr *xattr;
49 struct xfs_inode *ip = XFS_I(inode);
50 int error = 0;
51
52 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
53 struct xfs_da_args args = {
54 .dp = ip,
55 .attr_filter = XFS_ATTR_SECURE,
56 .name = xattr->name,
57 .namelen = strlen(xattr->name),
58 .value = xattr->value,
59 .valuelen = xattr->value_len,
60 };
61 error = xfs_attr_set(&args);
62 if (error < 0)
63 break;
64 }
65 return error;
66 }
67
68 /*
69 * Hook in SELinux. This is not quite correct yet, what we really need
70 * here (as we do for default ACLs) is a mechanism by which creation of
71 * these attrs can be journalled at inode creation time (along with the
72 * inode, of course, such that log replay can't cause these to be lost).
73 */
74
75 STATIC int
xfs_init_security(struct inode * inode,struct inode * dir,const struct qstr * qstr)76 xfs_init_security(
77 struct inode *inode,
78 struct inode *dir,
79 const struct qstr *qstr)
80 {
81 return security_inode_init_security(inode, dir, qstr,
82 &xfs_initxattrs, NULL);
83 }
84
85 static void
xfs_dentry_to_name(struct xfs_name * namep,struct dentry * dentry)86 xfs_dentry_to_name(
87 struct xfs_name *namep,
88 struct dentry *dentry)
89 {
90 namep->name = dentry->d_name.name;
91 namep->len = dentry->d_name.len;
92 namep->type = XFS_DIR3_FT_UNKNOWN;
93 }
94
95 static int
xfs_dentry_mode_to_name(struct xfs_name * namep,struct dentry * dentry,int mode)96 xfs_dentry_mode_to_name(
97 struct xfs_name *namep,
98 struct dentry *dentry,
99 int mode)
100 {
101 namep->name = dentry->d_name.name;
102 namep->len = dentry->d_name.len;
103 namep->type = xfs_mode_to_ftype(mode);
104
105 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
106 return -EFSCORRUPTED;
107
108 return 0;
109 }
110
111 STATIC void
xfs_cleanup_inode(struct inode * dir,struct inode * inode,struct dentry * dentry)112 xfs_cleanup_inode(
113 struct inode *dir,
114 struct inode *inode,
115 struct dentry *dentry)
116 {
117 struct xfs_name teardown;
118
119 /* Oh, the horror.
120 * If we can't add the ACL or we fail in
121 * xfs_init_security we must back out.
122 * ENOSPC can hit here, among other things.
123 */
124 xfs_dentry_to_name(&teardown, dentry);
125
126 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
127 }
128
129 STATIC int
xfs_generic_create(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev,bool tmpfile)130 xfs_generic_create(
131 struct inode *dir,
132 struct dentry *dentry,
133 umode_t mode,
134 dev_t rdev,
135 bool tmpfile) /* unnamed file */
136 {
137 struct inode *inode;
138 struct xfs_inode *ip = NULL;
139 struct posix_acl *default_acl, *acl;
140 struct xfs_name name;
141 int error;
142
143 /*
144 * Irix uses Missed'em'V split, but doesn't want to see
145 * the upper 5 bits of (14bit) major.
146 */
147 if (S_ISCHR(mode) || S_ISBLK(mode)) {
148 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
149 return -EINVAL;
150 } else {
151 rdev = 0;
152 }
153
154 error = posix_acl_create(dir, &mode, &default_acl, &acl);
155 if (error)
156 return error;
157
158 /* Verify mode is valid also for tmpfile case */
159 error = xfs_dentry_mode_to_name(&name, dentry, mode);
160 if (unlikely(error))
161 goto out_free_acl;
162
163 if (!tmpfile) {
164 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
165 } else {
166 error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
167 }
168 if (unlikely(error))
169 goto out_free_acl;
170
171 inode = VFS_I(ip);
172
173 error = xfs_init_security(inode, dir, &dentry->d_name);
174 if (unlikely(error))
175 goto out_cleanup_inode;
176
177 #ifdef CONFIG_XFS_POSIX_ACL
178 if (default_acl) {
179 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
180 if (error)
181 goto out_cleanup_inode;
182 }
183 if (acl) {
184 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
185 if (error)
186 goto out_cleanup_inode;
187 }
188 #endif
189
190 xfs_setup_iops(ip);
191
192 if (tmpfile) {
193 /*
194 * The VFS requires that any inode fed to d_tmpfile must have
195 * nlink == 1 so that it can decrement the nlink in d_tmpfile.
196 * However, we created the temp file with nlink == 0 because
197 * we're not allowed to put an inode with nlink > 0 on the
198 * unlinked list. Therefore we have to set nlink to 1 so that
199 * d_tmpfile can immediately set it back to zero.
200 */
201 set_nlink(inode, 1);
202 d_tmpfile(dentry, inode);
203 } else
204 d_instantiate(dentry, inode);
205
206 xfs_finish_inode_setup(ip);
207
208 out_free_acl:
209 if (default_acl)
210 posix_acl_release(default_acl);
211 if (acl)
212 posix_acl_release(acl);
213 return error;
214
215 out_cleanup_inode:
216 xfs_finish_inode_setup(ip);
217 if (!tmpfile)
218 xfs_cleanup_inode(dir, inode, dentry);
219 xfs_irele(ip);
220 goto out_free_acl;
221 }
222
223 STATIC int
xfs_vn_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)224 xfs_vn_mknod(
225 struct inode *dir,
226 struct dentry *dentry,
227 umode_t mode,
228 dev_t rdev)
229 {
230 return xfs_generic_create(dir, dentry, mode, rdev, false);
231 }
232
233 STATIC int
xfs_vn_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool flags)234 xfs_vn_create(
235 struct inode *dir,
236 struct dentry *dentry,
237 umode_t mode,
238 bool flags)
239 {
240 return xfs_generic_create(dir, dentry, mode, 0, false);
241 }
242
243 STATIC int
xfs_vn_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)244 xfs_vn_mkdir(
245 struct inode *dir,
246 struct dentry *dentry,
247 umode_t mode)
248 {
249 return xfs_generic_create(dir, dentry, mode | S_IFDIR, 0, false);
250 }
251
252 STATIC struct dentry *
xfs_vn_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)253 xfs_vn_lookup(
254 struct inode *dir,
255 struct dentry *dentry,
256 unsigned int flags)
257 {
258 struct inode *inode;
259 struct xfs_inode *cip;
260 struct xfs_name name;
261 int error;
262
263 if (dentry->d_name.len >= MAXNAMELEN)
264 return ERR_PTR(-ENAMETOOLONG);
265
266 xfs_dentry_to_name(&name, dentry);
267 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
268 if (likely(!error))
269 inode = VFS_I(cip);
270 else if (likely(error == -ENOENT))
271 inode = NULL;
272 else
273 inode = ERR_PTR(error);
274 return d_splice_alias(inode, dentry);
275 }
276
277 STATIC struct dentry *
xfs_vn_ci_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)278 xfs_vn_ci_lookup(
279 struct inode *dir,
280 struct dentry *dentry,
281 unsigned int flags)
282 {
283 struct xfs_inode *ip;
284 struct xfs_name xname;
285 struct xfs_name ci_name;
286 struct qstr dname;
287 int error;
288
289 if (dentry->d_name.len >= MAXNAMELEN)
290 return ERR_PTR(-ENAMETOOLONG);
291
292 xfs_dentry_to_name(&xname, dentry);
293 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
294 if (unlikely(error)) {
295 if (unlikely(error != -ENOENT))
296 return ERR_PTR(error);
297 /*
298 * call d_add(dentry, NULL) here when d_drop_negative_children
299 * is called in xfs_vn_mknod (ie. allow negative dentries
300 * with CI filesystems).
301 */
302 return NULL;
303 }
304
305 /* if exact match, just splice and exit */
306 if (!ci_name.name)
307 return d_splice_alias(VFS_I(ip), dentry);
308
309 /* else case-insensitive match... */
310 dname.name = ci_name.name;
311 dname.len = ci_name.len;
312 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
313 kmem_free(ci_name.name);
314 return dentry;
315 }
316
317 STATIC int
xfs_vn_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)318 xfs_vn_link(
319 struct dentry *old_dentry,
320 struct inode *dir,
321 struct dentry *dentry)
322 {
323 struct inode *inode = d_inode(old_dentry);
324 struct xfs_name name;
325 int error;
326
327 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
328 if (unlikely(error))
329 return error;
330
331 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
332 if (unlikely(error))
333 return error;
334
335 ihold(inode);
336 d_instantiate(dentry, inode);
337 return 0;
338 }
339
340 STATIC int
xfs_vn_unlink(struct inode * dir,struct dentry * dentry)341 xfs_vn_unlink(
342 struct inode *dir,
343 struct dentry *dentry)
344 {
345 struct xfs_name name;
346 int error;
347
348 xfs_dentry_to_name(&name, dentry);
349
350 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
351 if (error)
352 return error;
353
354 /*
355 * With unlink, the VFS makes the dentry "negative": no inode,
356 * but still hashed. This is incompatible with case-insensitive
357 * mode, so invalidate (unhash) the dentry in CI-mode.
358 */
359 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
360 d_invalidate(dentry);
361 return 0;
362 }
363
364 STATIC int
xfs_vn_symlink(struct inode * dir,struct dentry * dentry,const char * symname)365 xfs_vn_symlink(
366 struct inode *dir,
367 struct dentry *dentry,
368 const char *symname)
369 {
370 struct inode *inode;
371 struct xfs_inode *cip = NULL;
372 struct xfs_name name;
373 int error;
374 umode_t mode;
375
376 mode = S_IFLNK |
377 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
378 error = xfs_dentry_mode_to_name(&name, dentry, mode);
379 if (unlikely(error))
380 goto out;
381
382 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
383 if (unlikely(error))
384 goto out;
385
386 inode = VFS_I(cip);
387
388 error = xfs_init_security(inode, dir, &dentry->d_name);
389 if (unlikely(error))
390 goto out_cleanup_inode;
391
392 xfs_setup_iops(cip);
393
394 d_instantiate(dentry, inode);
395 xfs_finish_inode_setup(cip);
396 return 0;
397
398 out_cleanup_inode:
399 xfs_finish_inode_setup(cip);
400 xfs_cleanup_inode(dir, inode, dentry);
401 xfs_irele(cip);
402 out:
403 return error;
404 }
405
406 STATIC int
xfs_vn_rename(struct inode * odir,struct dentry * odentry,struct inode * ndir,struct dentry * ndentry,unsigned int flags)407 xfs_vn_rename(
408 struct inode *odir,
409 struct dentry *odentry,
410 struct inode *ndir,
411 struct dentry *ndentry,
412 unsigned int flags)
413 {
414 struct inode *new_inode = d_inode(ndentry);
415 int omode = 0;
416 int error;
417 struct xfs_name oname;
418 struct xfs_name nname;
419
420 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
421 return -EINVAL;
422
423 /* if we are exchanging files, we need to set i_mode of both files */
424 if (flags & RENAME_EXCHANGE)
425 omode = d_inode(ndentry)->i_mode;
426
427 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
428 if (omode && unlikely(error))
429 return error;
430
431 error = xfs_dentry_mode_to_name(&nname, ndentry,
432 d_inode(odentry)->i_mode);
433 if (unlikely(error))
434 return error;
435
436 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
437 XFS_I(ndir), &nname,
438 new_inode ? XFS_I(new_inode) : NULL, flags);
439 }
440
441 /*
442 * careful here - this function can get called recursively, so
443 * we need to be very careful about how much stack we use.
444 * uio is kmalloced for this reason...
445 */
446 STATIC const char *
xfs_vn_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)447 xfs_vn_get_link(
448 struct dentry *dentry,
449 struct inode *inode,
450 struct delayed_call *done)
451 {
452 char *link;
453 int error = -ENOMEM;
454
455 if (!dentry)
456 return ERR_PTR(-ECHILD);
457
458 link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
459 if (!link)
460 goto out_err;
461
462 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
463 if (unlikely(error))
464 goto out_kfree;
465
466 set_delayed_call(done, kfree_link, link);
467 return link;
468
469 out_kfree:
470 kfree(link);
471 out_err:
472 return ERR_PTR(error);
473 }
474
475 STATIC const char *
xfs_vn_get_link_inline(struct dentry * dentry,struct inode * inode,struct delayed_call * done)476 xfs_vn_get_link_inline(
477 struct dentry *dentry,
478 struct inode *inode,
479 struct delayed_call *done)
480 {
481 struct xfs_inode *ip = XFS_I(inode);
482 char *link;
483
484 ASSERT(ip->i_df.if_flags & XFS_IFINLINE);
485
486 /*
487 * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
488 * if_data is junk.
489 */
490 link = ip->i_df.if_u1.if_data;
491 if (XFS_IS_CORRUPT(ip->i_mount, !link))
492 return ERR_PTR(-EFSCORRUPTED);
493 return link;
494 }
495
496 static uint32_t
xfs_stat_blksize(struct xfs_inode * ip)497 xfs_stat_blksize(
498 struct xfs_inode *ip)
499 {
500 struct xfs_mount *mp = ip->i_mount;
501
502 /*
503 * If the file blocks are being allocated from a realtime volume, then
504 * always return the realtime extent size.
505 */
506 if (XFS_IS_REALTIME_INODE(ip))
507 return xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
508
509 /*
510 * Allow large block sizes to be reported to userspace programs if the
511 * "largeio" mount option is used.
512 *
513 * If compatibility mode is specified, simply return the basic unit of
514 * caching so that we don't get inefficient read/modify/write I/O from
515 * user apps. Otherwise....
516 *
517 * If the underlying volume is a stripe, then return the stripe width in
518 * bytes as the recommended I/O size. It is not a stripe and we've set a
519 * default buffered I/O size, return that, otherwise return the compat
520 * default.
521 */
522 if (mp->m_flags & XFS_MOUNT_LARGEIO) {
523 if (mp->m_swidth)
524 return mp->m_swidth << mp->m_sb.sb_blocklog;
525 if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
526 return 1U << mp->m_allocsize_log;
527 }
528
529 return PAGE_SIZE;
530 }
531
532 STATIC int
xfs_vn_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)533 xfs_vn_getattr(
534 const struct path *path,
535 struct kstat *stat,
536 u32 request_mask,
537 unsigned int query_flags)
538 {
539 struct inode *inode = d_inode(path->dentry);
540 struct xfs_inode *ip = XFS_I(inode);
541 struct xfs_mount *mp = ip->i_mount;
542
543 trace_xfs_getattr(ip);
544
545 if (XFS_FORCED_SHUTDOWN(mp))
546 return -EIO;
547
548 stat->size = XFS_ISIZE(ip);
549 stat->dev = inode->i_sb->s_dev;
550 stat->mode = inode->i_mode;
551 stat->nlink = inode->i_nlink;
552 stat->uid = inode->i_uid;
553 stat->gid = inode->i_gid;
554 stat->ino = ip->i_ino;
555 stat->atime = inode->i_atime;
556 stat->mtime = inode->i_mtime;
557 stat->ctime = inode->i_ctime;
558 stat->blocks =
559 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
560
561 if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
562 if (request_mask & STATX_BTIME) {
563 stat->result_mask |= STATX_BTIME;
564 stat->btime = ip->i_d.di_crtime;
565 }
566 }
567
568 /*
569 * Note: If you add another clause to set an attribute flag, please
570 * update attributes_mask below.
571 */
572 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
573 stat->attributes |= STATX_ATTR_IMMUTABLE;
574 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
575 stat->attributes |= STATX_ATTR_APPEND;
576 if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
577 stat->attributes |= STATX_ATTR_NODUMP;
578
579 stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
580 STATX_ATTR_APPEND |
581 STATX_ATTR_NODUMP);
582
583 switch (inode->i_mode & S_IFMT) {
584 case S_IFBLK:
585 case S_IFCHR:
586 stat->blksize = BLKDEV_IOSIZE;
587 stat->rdev = inode->i_rdev;
588 break;
589 default:
590 stat->blksize = xfs_stat_blksize(ip);
591 stat->rdev = 0;
592 break;
593 }
594
595 return 0;
596 }
597
598 static int
xfs_vn_change_ok(struct dentry * dentry,struct iattr * iattr)599 xfs_vn_change_ok(
600 struct dentry *dentry,
601 struct iattr *iattr)
602 {
603 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
604
605 if (mp->m_flags & XFS_MOUNT_RDONLY)
606 return -EROFS;
607
608 if (XFS_FORCED_SHUTDOWN(mp))
609 return -EIO;
610
611 return setattr_prepare(dentry, iattr);
612 }
613
614 /*
615 * Set non-size attributes of an inode.
616 *
617 * Caution: The caller of this function is responsible for calling
618 * setattr_prepare() or otherwise verifying the change is fine.
619 */
620 int
xfs_setattr_nonsize(struct xfs_inode * ip,struct iattr * iattr,int flags)621 xfs_setattr_nonsize(
622 struct xfs_inode *ip,
623 struct iattr *iattr,
624 int flags)
625 {
626 xfs_mount_t *mp = ip->i_mount;
627 struct inode *inode = VFS_I(ip);
628 int mask = iattr->ia_valid;
629 xfs_trans_t *tp;
630 int error;
631 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
632 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
633 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
634 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
635
636 ASSERT((mask & ATTR_SIZE) == 0);
637
638 /*
639 * If disk quotas is on, we make sure that the dquots do exist on disk,
640 * before we start any other transactions. Trying to do this later
641 * is messy. We don't care to take a readlock to look at the ids
642 * in inode here, because we can't hold it across the trans_reserve.
643 * If the IDs do change before we take the ilock, we're covered
644 * because the i_*dquot fields will get updated anyway.
645 */
646 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
647 uint qflags = 0;
648
649 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
650 uid = iattr->ia_uid;
651 qflags |= XFS_QMOPT_UQUOTA;
652 } else {
653 uid = inode->i_uid;
654 }
655 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
656 gid = iattr->ia_gid;
657 qflags |= XFS_QMOPT_GQUOTA;
658 } else {
659 gid = inode->i_gid;
660 }
661
662 /*
663 * We take a reference when we initialize udqp and gdqp,
664 * so it is important that we never blindly double trip on
665 * the same variable. See xfs_create() for an example.
666 */
667 ASSERT(udqp == NULL);
668 ASSERT(gdqp == NULL);
669 error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_d.di_projid,
670 qflags, &udqp, &gdqp, NULL);
671 if (error)
672 return error;
673 }
674
675 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
676 if (error)
677 goto out_dqrele;
678
679 xfs_ilock(ip, XFS_ILOCK_EXCL);
680 xfs_trans_ijoin(tp, ip, 0);
681
682 /*
683 * Change file ownership. Must be the owner or privileged.
684 */
685 if (mask & (ATTR_UID|ATTR_GID)) {
686 /*
687 * These IDs could have changed since we last looked at them.
688 * But, we're assured that if the ownership did change
689 * while we didn't have the inode locked, inode's dquot(s)
690 * would have changed also.
691 */
692 iuid = inode->i_uid;
693 igid = inode->i_gid;
694 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
695 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
696
697 /*
698 * Do a quota reservation only if uid/gid is actually
699 * going to change.
700 */
701 if (XFS_IS_QUOTA_RUNNING(mp) &&
702 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
703 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
704 ASSERT(tp);
705 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
706 NULL, capable(CAP_FOWNER) ?
707 XFS_QMOPT_FORCE_RES : 0);
708 if (error) /* out of quota */
709 goto out_cancel;
710 }
711
712 /*
713 * Change the ownerships and register quota modifications
714 * in the transaction.
715 */
716 if (!uid_eq(iuid, uid)) {
717 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
718 ASSERT(mask & ATTR_UID);
719 ASSERT(udqp);
720 olddquot1 = xfs_qm_vop_chown(tp, ip,
721 &ip->i_udquot, udqp);
722 }
723 }
724 if (!gid_eq(igid, gid)) {
725 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
726 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
727 !XFS_IS_PQUOTA_ON(mp));
728 ASSERT(mask & ATTR_GID);
729 ASSERT(gdqp);
730 olddquot2 = xfs_qm_vop_chown(tp, ip,
731 &ip->i_gdquot, gdqp);
732 }
733 }
734 }
735
736 setattr_copy(inode, iattr);
737 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
738
739 XFS_STATS_INC(mp, xs_ig_attrchg);
740
741 if (mp->m_flags & XFS_MOUNT_WSYNC)
742 xfs_trans_set_sync(tp);
743 error = xfs_trans_commit(tp);
744
745 xfs_iunlock(ip, XFS_ILOCK_EXCL);
746
747 /*
748 * Release any dquot(s) the inode had kept before chown.
749 */
750 xfs_qm_dqrele(olddquot1);
751 xfs_qm_dqrele(olddquot2);
752 xfs_qm_dqrele(udqp);
753 xfs_qm_dqrele(gdqp);
754
755 if (error)
756 return error;
757
758 /*
759 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
760 * update. We could avoid this with linked transactions
761 * and passing down the transaction pointer all the way
762 * to attr_set. No previous user of the generic
763 * Posix ACL code seems to care about this issue either.
764 */
765 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
766 error = posix_acl_chmod(inode, inode->i_mode);
767 if (error)
768 return error;
769 }
770
771 return 0;
772
773 out_cancel:
774 xfs_trans_cancel(tp);
775 xfs_iunlock(ip, XFS_ILOCK_EXCL);
776 out_dqrele:
777 xfs_qm_dqrele(udqp);
778 xfs_qm_dqrele(gdqp);
779 return error;
780 }
781
782 int
xfs_vn_setattr_nonsize(struct dentry * dentry,struct iattr * iattr)783 xfs_vn_setattr_nonsize(
784 struct dentry *dentry,
785 struct iattr *iattr)
786 {
787 struct xfs_inode *ip = XFS_I(d_inode(dentry));
788 int error;
789
790 trace_xfs_setattr(ip);
791
792 error = xfs_vn_change_ok(dentry, iattr);
793 if (error)
794 return error;
795 return xfs_setattr_nonsize(ip, iattr, 0);
796 }
797
798 /*
799 * Truncate file. Must have write permission and not be a directory.
800 *
801 * Caution: The caller of this function is responsible for calling
802 * setattr_prepare() or otherwise verifying the change is fine.
803 */
804 STATIC int
xfs_setattr_size(struct xfs_inode * ip,struct iattr * iattr)805 xfs_setattr_size(
806 struct xfs_inode *ip,
807 struct iattr *iattr)
808 {
809 struct xfs_mount *mp = ip->i_mount;
810 struct inode *inode = VFS_I(ip);
811 xfs_off_t oldsize, newsize;
812 struct xfs_trans *tp;
813 int error;
814 uint lock_flags = 0;
815 bool did_zeroing = false;
816
817 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
818 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
819 ASSERT(S_ISREG(inode->i_mode));
820 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
821 ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
822
823 oldsize = inode->i_size;
824 newsize = iattr->ia_size;
825
826 /*
827 * Short circuit the truncate case for zero length files.
828 */
829 if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
830 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
831 return 0;
832
833 /*
834 * Use the regular setattr path to update the timestamps.
835 */
836 iattr->ia_valid &= ~ATTR_SIZE;
837 return xfs_setattr_nonsize(ip, iattr, 0);
838 }
839
840 /*
841 * Make sure that the dquots are attached to the inode.
842 */
843 error = xfs_qm_dqattach(ip);
844 if (error)
845 return error;
846
847 /*
848 * Wait for all direct I/O to complete.
849 */
850 inode_dio_wait(inode);
851
852 /*
853 * File data changes must be complete before we start the transaction to
854 * modify the inode. This needs to be done before joining the inode to
855 * the transaction because the inode cannot be unlocked once it is a
856 * part of the transaction.
857 *
858 * Start with zeroing any data beyond EOF that we may expose on file
859 * extension, or zeroing out the rest of the block on a downward
860 * truncate.
861 */
862 if (newsize > oldsize) {
863 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
864 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
865 &did_zeroing, &xfs_buffered_write_iomap_ops);
866 } else {
867 /*
868 * iomap won't detect a dirty page over an unwritten block (or a
869 * cow block over a hole) and subsequently skips zeroing the
870 * newly post-EOF portion of the page. Flush the new EOF to
871 * convert the block before the pagecache truncate.
872 */
873 error = filemap_write_and_wait_range(inode->i_mapping, newsize,
874 newsize);
875 if (error)
876 return error;
877 error = iomap_truncate_page(inode, newsize, &did_zeroing,
878 &xfs_buffered_write_iomap_ops);
879 }
880
881 if (error)
882 return error;
883
884 /*
885 * We've already locked out new page faults, so now we can safely remove
886 * pages from the page cache knowing they won't get refaulted until we
887 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
888 * complete. The truncate_setsize() call also cleans partial EOF page
889 * PTEs on extending truncates and hence ensures sub-page block size
890 * filesystems are correctly handled, too.
891 *
892 * We have to do all the page cache truncate work outside the
893 * transaction context as the "lock" order is page lock->log space
894 * reservation as defined by extent allocation in the writeback path.
895 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
896 * having already truncated the in-memory version of the file (i.e. made
897 * user visible changes). There's not much we can do about this, except
898 * to hope that the caller sees ENOMEM and retries the truncate
899 * operation.
900 *
901 * And we update in-core i_size and truncate page cache beyond newsize
902 * before writeback the [di_size, newsize] range, so we're guaranteed
903 * not to write stale data past the new EOF on truncate down.
904 */
905 truncate_setsize(inode, newsize);
906
907 /*
908 * We are going to log the inode size change in this transaction so
909 * any previous writes that are beyond the on disk EOF and the new
910 * EOF that have not been written out need to be written here. If we
911 * do not write the data out, we expose ourselves to the null files
912 * problem. Note that this includes any block zeroing we did above;
913 * otherwise those blocks may not be zeroed after a crash.
914 */
915 if (did_zeroing ||
916 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
917 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
918 ip->i_d.di_size, newsize - 1);
919 if (error)
920 return error;
921 }
922
923 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
924 if (error)
925 return error;
926
927 lock_flags |= XFS_ILOCK_EXCL;
928 xfs_ilock(ip, XFS_ILOCK_EXCL);
929 xfs_trans_ijoin(tp, ip, 0);
930
931 /*
932 * Only change the c/mtime if we are changing the size or we are
933 * explicitly asked to change it. This handles the semantic difference
934 * between truncate() and ftruncate() as implemented in the VFS.
935 *
936 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
937 * special case where we need to update the times despite not having
938 * these flags set. For all other operations the VFS set these flags
939 * explicitly if it wants a timestamp update.
940 */
941 if (newsize != oldsize &&
942 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
943 iattr->ia_ctime = iattr->ia_mtime =
944 current_time(inode);
945 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
946 }
947
948 /*
949 * The first thing we do is set the size to new_size permanently on
950 * disk. This way we don't have to worry about anyone ever being able
951 * to look at the data being freed even in the face of a crash.
952 * What we're getting around here is the case where we free a block, it
953 * is allocated to another file, it is written to, and then we crash.
954 * If the new data gets written to the file but the log buffers
955 * containing the free and reallocation don't, then we'd end up with
956 * garbage in the blocks being freed. As long as we make the new size
957 * permanent before actually freeing any blocks it doesn't matter if
958 * they get written to.
959 */
960 ip->i_d.di_size = newsize;
961 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
962
963 if (newsize <= oldsize) {
964 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
965 if (error)
966 goto out_trans_cancel;
967
968 /*
969 * Truncated "down", so we're removing references to old data
970 * here - if we delay flushing for a long time, we expose
971 * ourselves unduly to the notorious NULL files problem. So,
972 * we mark this inode and flush it when the file is closed,
973 * and do not wait the usual (long) time for writeout.
974 */
975 xfs_iflags_set(ip, XFS_ITRUNCATED);
976
977 /* A truncate down always removes post-EOF blocks. */
978 xfs_inode_clear_eofblocks_tag(ip);
979 }
980
981 ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
982 setattr_copy(inode, iattr);
983 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
984
985 XFS_STATS_INC(mp, xs_ig_attrchg);
986
987 if (mp->m_flags & XFS_MOUNT_WSYNC)
988 xfs_trans_set_sync(tp);
989
990 error = xfs_trans_commit(tp);
991 out_unlock:
992 if (lock_flags)
993 xfs_iunlock(ip, lock_flags);
994 return error;
995
996 out_trans_cancel:
997 xfs_trans_cancel(tp);
998 goto out_unlock;
999 }
1000
1001 int
xfs_vn_setattr_size(struct dentry * dentry,struct iattr * iattr)1002 xfs_vn_setattr_size(
1003 struct dentry *dentry,
1004 struct iattr *iattr)
1005 {
1006 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1007 int error;
1008
1009 trace_xfs_setattr(ip);
1010
1011 error = xfs_vn_change_ok(dentry, iattr);
1012 if (error)
1013 return error;
1014 return xfs_setattr_size(ip, iattr);
1015 }
1016
1017 STATIC int
xfs_vn_setattr(struct dentry * dentry,struct iattr * iattr)1018 xfs_vn_setattr(
1019 struct dentry *dentry,
1020 struct iattr *iattr)
1021 {
1022 int error;
1023
1024 if (iattr->ia_valid & ATTR_SIZE) {
1025 struct inode *inode = d_inode(dentry);
1026 struct xfs_inode *ip = XFS_I(inode);
1027 uint iolock;
1028
1029 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1030 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1031
1032 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1033 if (error) {
1034 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1035 return error;
1036 }
1037
1038 error = xfs_vn_setattr_size(dentry, iattr);
1039 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1040 } else {
1041 error = xfs_vn_setattr_nonsize(dentry, iattr);
1042 }
1043
1044 return error;
1045 }
1046
1047 STATIC int
xfs_vn_update_time(struct inode * inode,struct timespec64 * now,int flags)1048 xfs_vn_update_time(
1049 struct inode *inode,
1050 struct timespec64 *now,
1051 int flags)
1052 {
1053 struct xfs_inode *ip = XFS_I(inode);
1054 struct xfs_mount *mp = ip->i_mount;
1055 int log_flags = XFS_ILOG_TIMESTAMP;
1056 struct xfs_trans *tp;
1057 int error;
1058
1059 trace_xfs_update_time(ip);
1060
1061 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1062 if (!((flags & S_VERSION) &&
1063 inode_maybe_inc_iversion(inode, false)))
1064 return generic_update_time(inode, now, flags);
1065
1066 /* Capture the iversion update that just occurred */
1067 log_flags |= XFS_ILOG_CORE;
1068 }
1069
1070 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1071 if (error)
1072 return error;
1073
1074 xfs_ilock(ip, XFS_ILOCK_EXCL);
1075 if (flags & S_CTIME)
1076 inode->i_ctime = *now;
1077 if (flags & S_MTIME)
1078 inode->i_mtime = *now;
1079 if (flags & S_ATIME)
1080 inode->i_atime = *now;
1081
1082 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1083 xfs_trans_log_inode(tp, ip, log_flags);
1084 return xfs_trans_commit(tp);
1085 }
1086
1087 STATIC int
xfs_vn_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,u64 start,u64 length)1088 xfs_vn_fiemap(
1089 struct inode *inode,
1090 struct fiemap_extent_info *fieinfo,
1091 u64 start,
1092 u64 length)
1093 {
1094 int error;
1095
1096 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1097 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1098 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1099 error = iomap_fiemap(inode, fieinfo, start, length,
1100 &xfs_xattr_iomap_ops);
1101 } else {
1102 error = iomap_fiemap(inode, fieinfo, start, length,
1103 &xfs_read_iomap_ops);
1104 }
1105 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1106
1107 return error;
1108 }
1109
1110 STATIC int
xfs_vn_tmpfile(struct inode * dir,struct dentry * dentry,umode_t mode)1111 xfs_vn_tmpfile(
1112 struct inode *dir,
1113 struct dentry *dentry,
1114 umode_t mode)
1115 {
1116 return xfs_generic_create(dir, dentry, mode, 0, true);
1117 }
1118
1119 static const struct inode_operations xfs_inode_operations = {
1120 .get_acl = xfs_get_acl,
1121 .set_acl = xfs_set_acl,
1122 .getattr = xfs_vn_getattr,
1123 .setattr = xfs_vn_setattr,
1124 .listxattr = xfs_vn_listxattr,
1125 .fiemap = xfs_vn_fiemap,
1126 .update_time = xfs_vn_update_time,
1127 };
1128
1129 static const struct inode_operations xfs_dir_inode_operations = {
1130 .create = xfs_vn_create,
1131 .lookup = xfs_vn_lookup,
1132 .link = xfs_vn_link,
1133 .unlink = xfs_vn_unlink,
1134 .symlink = xfs_vn_symlink,
1135 .mkdir = xfs_vn_mkdir,
1136 /*
1137 * Yes, XFS uses the same method for rmdir and unlink.
1138 *
1139 * There are some subtile differences deeper in the code,
1140 * but we use S_ISDIR to check for those.
1141 */
1142 .rmdir = xfs_vn_unlink,
1143 .mknod = xfs_vn_mknod,
1144 .rename = xfs_vn_rename,
1145 .get_acl = xfs_get_acl,
1146 .set_acl = xfs_set_acl,
1147 .getattr = xfs_vn_getattr,
1148 .setattr = xfs_vn_setattr,
1149 .listxattr = xfs_vn_listxattr,
1150 .update_time = xfs_vn_update_time,
1151 .tmpfile = xfs_vn_tmpfile,
1152 };
1153
1154 static const struct inode_operations xfs_dir_ci_inode_operations = {
1155 .create = xfs_vn_create,
1156 .lookup = xfs_vn_ci_lookup,
1157 .link = xfs_vn_link,
1158 .unlink = xfs_vn_unlink,
1159 .symlink = xfs_vn_symlink,
1160 .mkdir = xfs_vn_mkdir,
1161 /*
1162 * Yes, XFS uses the same method for rmdir and unlink.
1163 *
1164 * There are some subtile differences deeper in the code,
1165 * but we use S_ISDIR to check for those.
1166 */
1167 .rmdir = xfs_vn_unlink,
1168 .mknod = xfs_vn_mknod,
1169 .rename = xfs_vn_rename,
1170 .get_acl = xfs_get_acl,
1171 .set_acl = xfs_set_acl,
1172 .getattr = xfs_vn_getattr,
1173 .setattr = xfs_vn_setattr,
1174 .listxattr = xfs_vn_listxattr,
1175 .update_time = xfs_vn_update_time,
1176 .tmpfile = xfs_vn_tmpfile,
1177 };
1178
1179 static const struct inode_operations xfs_symlink_inode_operations = {
1180 .get_link = xfs_vn_get_link,
1181 .getattr = xfs_vn_getattr,
1182 .setattr = xfs_vn_setattr,
1183 .listxattr = xfs_vn_listxattr,
1184 .update_time = xfs_vn_update_time,
1185 };
1186
1187 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1188 .get_link = xfs_vn_get_link_inline,
1189 .getattr = xfs_vn_getattr,
1190 .setattr = xfs_vn_setattr,
1191 .listxattr = xfs_vn_listxattr,
1192 .update_time = xfs_vn_update_time,
1193 };
1194
1195 /* Figure out if this file actually supports DAX. */
1196 static bool
xfs_inode_supports_dax(struct xfs_inode * ip)1197 xfs_inode_supports_dax(
1198 struct xfs_inode *ip)
1199 {
1200 struct xfs_mount *mp = ip->i_mount;
1201
1202 /* Only supported on regular files. */
1203 if (!S_ISREG(VFS_I(ip)->i_mode))
1204 return false;
1205
1206 /* Only supported on non-reflinked files. */
1207 if (xfs_is_reflink_inode(ip))
1208 return false;
1209
1210 /* Block size must match page size */
1211 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1212 return false;
1213
1214 /* Device has to support DAX too. */
1215 return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1216 }
1217
1218 static bool
xfs_inode_should_enable_dax(struct xfs_inode * ip)1219 xfs_inode_should_enable_dax(
1220 struct xfs_inode *ip)
1221 {
1222 if (!IS_ENABLED(CONFIG_FS_DAX))
1223 return false;
1224 if (ip->i_mount->m_flags & XFS_MOUNT_DAX_NEVER)
1225 return false;
1226 if (!xfs_inode_supports_dax(ip))
1227 return false;
1228 if (ip->i_mount->m_flags & XFS_MOUNT_DAX_ALWAYS)
1229 return true;
1230 if (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
1231 return true;
1232 return false;
1233 }
1234
1235 void
xfs_diflags_to_iflags(struct xfs_inode * ip,bool init)1236 xfs_diflags_to_iflags(
1237 struct xfs_inode *ip,
1238 bool init)
1239 {
1240 struct inode *inode = VFS_I(ip);
1241 unsigned int xflags = xfs_ip2xflags(ip);
1242 unsigned int flags = 0;
1243
1244 ASSERT(!(IS_DAX(inode) && init));
1245
1246 if (xflags & FS_XFLAG_IMMUTABLE)
1247 flags |= S_IMMUTABLE;
1248 if (xflags & FS_XFLAG_APPEND)
1249 flags |= S_APPEND;
1250 if (xflags & FS_XFLAG_SYNC)
1251 flags |= S_SYNC;
1252 if (xflags & FS_XFLAG_NOATIME)
1253 flags |= S_NOATIME;
1254 if (init && xfs_inode_should_enable_dax(ip))
1255 flags |= S_DAX;
1256
1257 /*
1258 * S_DAX can only be set during inode initialization and is never set by
1259 * the VFS, so we cannot mask off S_DAX in i_flags.
1260 */
1261 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1262 inode->i_flags |= flags;
1263 }
1264
1265 /*
1266 * Initialize the Linux inode.
1267 *
1268 * When reading existing inodes from disk this is called directly from xfs_iget,
1269 * when creating a new inode it is called from xfs_ialloc after setting up the
1270 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1271 * it up to the caller to deal with unlocking the inode appropriately.
1272 */
1273 void
xfs_setup_inode(struct xfs_inode * ip)1274 xfs_setup_inode(
1275 struct xfs_inode *ip)
1276 {
1277 struct inode *inode = &ip->i_vnode;
1278 gfp_t gfp_mask;
1279
1280 inode->i_ino = ip->i_ino;
1281 inode->i_state |= I_NEW;
1282
1283 inode_sb_list_add(inode);
1284 /* make the inode look hashed for the writeback code */
1285 inode_fake_hash(inode);
1286
1287 i_size_write(inode, ip->i_d.di_size);
1288 xfs_diflags_to_iflags(ip, true);
1289
1290 if (S_ISDIR(inode->i_mode)) {
1291 /*
1292 * We set the i_rwsem class here to avoid potential races with
1293 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1294 * after a filehandle lookup has already found the inode in
1295 * cache before it has been unlocked via unlock_new_inode().
1296 */
1297 lockdep_set_class(&inode->i_rwsem,
1298 &inode->i_sb->s_type->i_mutex_dir_key);
1299 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1300 } else {
1301 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1302 }
1303
1304 /*
1305 * Ensure all page cache allocations are done from GFP_NOFS context to
1306 * prevent direct reclaim recursion back into the filesystem and blowing
1307 * stacks or deadlocking.
1308 */
1309 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1310 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1311
1312 /*
1313 * If there is no attribute fork no ACL can exist on this inode,
1314 * and it can't have any file capabilities attached to it either.
1315 */
1316 if (!XFS_IFORK_Q(ip)) {
1317 inode_has_no_xattr(inode);
1318 cache_no_acl(inode);
1319 }
1320 }
1321
1322 void
xfs_setup_iops(struct xfs_inode * ip)1323 xfs_setup_iops(
1324 struct xfs_inode *ip)
1325 {
1326 struct inode *inode = &ip->i_vnode;
1327
1328 switch (inode->i_mode & S_IFMT) {
1329 case S_IFREG:
1330 inode->i_op = &xfs_inode_operations;
1331 inode->i_fop = &xfs_file_operations;
1332 if (IS_DAX(inode))
1333 inode->i_mapping->a_ops = &xfs_dax_aops;
1334 else
1335 inode->i_mapping->a_ops = &xfs_address_space_operations;
1336 break;
1337 case S_IFDIR:
1338 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1339 inode->i_op = &xfs_dir_ci_inode_operations;
1340 else
1341 inode->i_op = &xfs_dir_inode_operations;
1342 inode->i_fop = &xfs_dir_file_operations;
1343 break;
1344 case S_IFLNK:
1345 if (ip->i_df.if_flags & XFS_IFINLINE)
1346 inode->i_op = &xfs_inline_symlink_inode_operations;
1347 else
1348 inode->i_op = &xfs_symlink_inode_operations;
1349 break;
1350 default:
1351 inode->i_op = &xfs_inode_operations;
1352 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1353 break;
1354 }
1355 }
1356