Loading...
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_da_format.h"
17#include "xfs_da_btree.h"
18#include "xfs_attr.h"
19#include "xfs_trans.h"
20#include "xfs_trace.h"
21#include "xfs_icache.h"
22#include "xfs_symlink.h"
23#include "xfs_dir2.h"
24#include "xfs_iomap.h"
25#include "xfs_error.h"
26#include "xfs_ioctl.h"
27#include "xfs_xattr.h"
28
29#include <linux/posix_acl.h>
30#include <linux/security.h>
31#include <linux/iversion.h>
32#include <linux/fiemap.h>
33
34/*
35 * Directories have different lock order w.r.t. mmap_lock compared to regular
36 * files. This is due to readdir potentially triggering page faults on a user
37 * buffer inside filldir(), and this happens with the ilock on the directory
38 * held. For regular files, the lock order is the other way around - the
39 * mmap_lock is taken during the page fault, and then we lock the ilock to do
40 * block mapping. Hence we need a different class for the directory ilock so
41 * that lockdep can tell them apart.
42 */
43static struct lock_class_key xfs_nondir_ilock_class;
44static struct lock_class_key xfs_dir_ilock_class;
45
46static int
47xfs_initxattrs(
48 struct inode *inode,
49 const struct xattr *xattr_array,
50 void *fs_info)
51{
52 const struct xattr *xattr;
53 struct xfs_inode *ip = XFS_I(inode);
54 int error = 0;
55
56 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
57 struct xfs_da_args args = {
58 .dp = ip,
59 .attr_filter = XFS_ATTR_SECURE,
60 .name = xattr->name,
61 .namelen = strlen(xattr->name),
62 .value = xattr->value,
63 .valuelen = xattr->value_len,
64 };
65 error = xfs_attr_change(&args);
66 if (error < 0)
67 break;
68 }
69 return error;
70}
71
72/*
73 * Hook in SELinux. This is not quite correct yet, what we really need
74 * here (as we do for default ACLs) is a mechanism by which creation of
75 * these attrs can be journalled at inode creation time (along with the
76 * inode, of course, such that log replay can't cause these to be lost).
77 */
78int
79xfs_inode_init_security(
80 struct inode *inode,
81 struct inode *dir,
82 const struct qstr *qstr)
83{
84 return security_inode_init_security(inode, dir, qstr,
85 &xfs_initxattrs, NULL);
86}
87
88static void
89xfs_dentry_to_name(
90 struct xfs_name *namep,
91 struct dentry *dentry)
92{
93 namep->name = dentry->d_name.name;
94 namep->len = dentry->d_name.len;
95 namep->type = XFS_DIR3_FT_UNKNOWN;
96}
97
98static int
99xfs_dentry_mode_to_name(
100 struct xfs_name *namep,
101 struct dentry *dentry,
102 int mode)
103{
104 namep->name = dentry->d_name.name;
105 namep->len = dentry->d_name.len;
106 namep->type = xfs_mode_to_ftype(mode);
107
108 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
109 return -EFSCORRUPTED;
110
111 return 0;
112}
113
114STATIC void
115xfs_cleanup_inode(
116 struct inode *dir,
117 struct inode *inode,
118 struct dentry *dentry)
119{
120 struct xfs_name teardown;
121
122 /* Oh, the horror.
123 * If we can't add the ACL or we fail in
124 * xfs_inode_init_security we must back out.
125 * ENOSPC can hit here, among other things.
126 */
127 xfs_dentry_to_name(&teardown, dentry);
128
129 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
130}
131
132/*
133 * Check to see if we are likely to need an extended attribute to be added to
134 * the inode we are about to allocate. This allows the attribute fork to be
135 * created during the inode allocation, reducing the number of transactions we
136 * need to do in this fast path.
137 *
138 * The security checks are optimistic, but not guaranteed. The two LSMs that
139 * require xattrs to be added here (selinux and smack) are also the only two
140 * LSMs that add a sb->s_security structure to the superblock. Hence if security
141 * is enabled and sb->s_security is set, we have a pretty good idea that we are
142 * going to be asked to add a security xattr immediately after allocating the
143 * xfs inode and instantiating the VFS inode.
144 */
145static inline bool
146xfs_create_need_xattr(
147 struct inode *dir,
148 struct posix_acl *default_acl,
149 struct posix_acl *acl)
150{
151 if (acl)
152 return true;
153 if (default_acl)
154 return true;
155#if IS_ENABLED(CONFIG_SECURITY)
156 if (dir->i_sb->s_security)
157 return true;
158#endif
159 return false;
160}
161
162
163STATIC int
164xfs_generic_create(
165 struct mnt_idmap *idmap,
166 struct inode *dir,
167 struct dentry *dentry,
168 umode_t mode,
169 dev_t rdev,
170 struct file *tmpfile) /* unnamed file */
171{
172 struct inode *inode;
173 struct xfs_inode *ip = NULL;
174 struct posix_acl *default_acl, *acl;
175 struct xfs_name name;
176 int error;
177
178 /*
179 * Irix uses Missed'em'V split, but doesn't want to see
180 * the upper 5 bits of (14bit) major.
181 */
182 if (S_ISCHR(mode) || S_ISBLK(mode)) {
183 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
184 return -EINVAL;
185 } else {
186 rdev = 0;
187 }
188
189 error = posix_acl_create(dir, &mode, &default_acl, &acl);
190 if (error)
191 return error;
192
193 /* Verify mode is valid also for tmpfile case */
194 error = xfs_dentry_mode_to_name(&name, dentry, mode);
195 if (unlikely(error))
196 goto out_free_acl;
197
198 if (!tmpfile) {
199 error = xfs_create(idmap, XFS_I(dir), &name, mode, rdev,
200 xfs_create_need_xattr(dir, default_acl, acl),
201 &ip);
202 } else {
203 error = xfs_create_tmpfile(idmap, XFS_I(dir), mode, &ip);
204 }
205 if (unlikely(error))
206 goto out_free_acl;
207
208 inode = VFS_I(ip);
209
210 error = xfs_inode_init_security(inode, dir, &dentry->d_name);
211 if (unlikely(error))
212 goto out_cleanup_inode;
213
214 if (default_acl) {
215 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
216 if (error)
217 goto out_cleanup_inode;
218 }
219 if (acl) {
220 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
221 if (error)
222 goto out_cleanup_inode;
223 }
224
225 xfs_setup_iops(ip);
226
227 if (tmpfile) {
228 /*
229 * The VFS requires that any inode fed to d_tmpfile must have
230 * nlink == 1 so that it can decrement the nlink in d_tmpfile.
231 * However, we created the temp file with nlink == 0 because
232 * we're not allowed to put an inode with nlink > 0 on the
233 * unlinked list. Therefore we have to set nlink to 1 so that
234 * d_tmpfile can immediately set it back to zero.
235 */
236 set_nlink(inode, 1);
237 d_tmpfile(tmpfile, inode);
238 } else
239 d_instantiate(dentry, inode);
240
241 xfs_finish_inode_setup(ip);
242
243 out_free_acl:
244 posix_acl_release(default_acl);
245 posix_acl_release(acl);
246 return error;
247
248 out_cleanup_inode:
249 xfs_finish_inode_setup(ip);
250 if (!tmpfile)
251 xfs_cleanup_inode(dir, inode, dentry);
252 xfs_irele(ip);
253 goto out_free_acl;
254}
255
256STATIC int
257xfs_vn_mknod(
258 struct mnt_idmap *idmap,
259 struct inode *dir,
260 struct dentry *dentry,
261 umode_t mode,
262 dev_t rdev)
263{
264 return xfs_generic_create(idmap, dir, dentry, mode, rdev, NULL);
265}
266
267STATIC int
268xfs_vn_create(
269 struct mnt_idmap *idmap,
270 struct inode *dir,
271 struct dentry *dentry,
272 umode_t mode,
273 bool flags)
274{
275 return xfs_generic_create(idmap, dir, dentry, mode, 0, NULL);
276}
277
278STATIC int
279xfs_vn_mkdir(
280 struct mnt_idmap *idmap,
281 struct inode *dir,
282 struct dentry *dentry,
283 umode_t mode)
284{
285 return xfs_generic_create(idmap, dir, dentry, mode | S_IFDIR, 0, NULL);
286}
287
288STATIC struct dentry *
289xfs_vn_lookup(
290 struct inode *dir,
291 struct dentry *dentry,
292 unsigned int flags)
293{
294 struct inode *inode;
295 struct xfs_inode *cip;
296 struct xfs_name name;
297 int error;
298
299 if (dentry->d_name.len >= MAXNAMELEN)
300 return ERR_PTR(-ENAMETOOLONG);
301
302 xfs_dentry_to_name(&name, dentry);
303 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
304 if (likely(!error))
305 inode = VFS_I(cip);
306 else if (likely(error == -ENOENT))
307 inode = NULL;
308 else
309 inode = ERR_PTR(error);
310 return d_splice_alias(inode, dentry);
311}
312
313STATIC struct dentry *
314xfs_vn_ci_lookup(
315 struct inode *dir,
316 struct dentry *dentry,
317 unsigned int flags)
318{
319 struct xfs_inode *ip;
320 struct xfs_name xname;
321 struct xfs_name ci_name;
322 struct qstr dname;
323 int error;
324
325 if (dentry->d_name.len >= MAXNAMELEN)
326 return ERR_PTR(-ENAMETOOLONG);
327
328 xfs_dentry_to_name(&xname, dentry);
329 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
330 if (unlikely(error)) {
331 if (unlikely(error != -ENOENT))
332 return ERR_PTR(error);
333 /*
334 * call d_add(dentry, NULL) here when d_drop_negative_children
335 * is called in xfs_vn_mknod (ie. allow negative dentries
336 * with CI filesystems).
337 */
338 return NULL;
339 }
340
341 /* if exact match, just splice and exit */
342 if (!ci_name.name)
343 return d_splice_alias(VFS_I(ip), dentry);
344
345 /* else case-insensitive match... */
346 dname.name = ci_name.name;
347 dname.len = ci_name.len;
348 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
349 kmem_free(ci_name.name);
350 return dentry;
351}
352
353STATIC int
354xfs_vn_link(
355 struct dentry *old_dentry,
356 struct inode *dir,
357 struct dentry *dentry)
358{
359 struct inode *inode = d_inode(old_dentry);
360 struct xfs_name name;
361 int error;
362
363 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
364 if (unlikely(error))
365 return error;
366
367 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
368 if (unlikely(error))
369 return error;
370
371 ihold(inode);
372 d_instantiate(dentry, inode);
373 return 0;
374}
375
376STATIC int
377xfs_vn_unlink(
378 struct inode *dir,
379 struct dentry *dentry)
380{
381 struct xfs_name name;
382 int error;
383
384 xfs_dentry_to_name(&name, dentry);
385
386 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
387 if (error)
388 return error;
389
390 /*
391 * With unlink, the VFS makes the dentry "negative": no inode,
392 * but still hashed. This is incompatible with case-insensitive
393 * mode, so invalidate (unhash) the dentry in CI-mode.
394 */
395 if (xfs_has_asciici(XFS_M(dir->i_sb)))
396 d_invalidate(dentry);
397 return 0;
398}
399
400STATIC int
401xfs_vn_symlink(
402 struct mnt_idmap *idmap,
403 struct inode *dir,
404 struct dentry *dentry,
405 const char *symname)
406{
407 struct inode *inode;
408 struct xfs_inode *cip = NULL;
409 struct xfs_name name;
410 int error;
411 umode_t mode;
412
413 mode = S_IFLNK |
414 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
415 error = xfs_dentry_mode_to_name(&name, dentry, mode);
416 if (unlikely(error))
417 goto out;
418
419 error = xfs_symlink(idmap, XFS_I(dir), &name, symname, mode, &cip);
420 if (unlikely(error))
421 goto out;
422
423 inode = VFS_I(cip);
424
425 error = xfs_inode_init_security(inode, dir, &dentry->d_name);
426 if (unlikely(error))
427 goto out_cleanup_inode;
428
429 xfs_setup_iops(cip);
430
431 d_instantiate(dentry, inode);
432 xfs_finish_inode_setup(cip);
433 return 0;
434
435 out_cleanup_inode:
436 xfs_finish_inode_setup(cip);
437 xfs_cleanup_inode(dir, inode, dentry);
438 xfs_irele(cip);
439 out:
440 return error;
441}
442
443STATIC int
444xfs_vn_rename(
445 struct mnt_idmap *idmap,
446 struct inode *odir,
447 struct dentry *odentry,
448 struct inode *ndir,
449 struct dentry *ndentry,
450 unsigned int flags)
451{
452 struct inode *new_inode = d_inode(ndentry);
453 int omode = 0;
454 int error;
455 struct xfs_name oname;
456 struct xfs_name nname;
457
458 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
459 return -EINVAL;
460
461 /* if we are exchanging files, we need to set i_mode of both files */
462 if (flags & RENAME_EXCHANGE)
463 omode = d_inode(ndentry)->i_mode;
464
465 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
466 if (omode && unlikely(error))
467 return error;
468
469 error = xfs_dentry_mode_to_name(&nname, ndentry,
470 d_inode(odentry)->i_mode);
471 if (unlikely(error))
472 return error;
473
474 return xfs_rename(idmap, XFS_I(odir), &oname,
475 XFS_I(d_inode(odentry)), XFS_I(ndir), &nname,
476 new_inode ? XFS_I(new_inode) : NULL, flags);
477}
478
479/*
480 * careful here - this function can get called recursively, so
481 * we need to be very careful about how much stack we use.
482 * uio is kmalloced for this reason...
483 */
484STATIC const char *
485xfs_vn_get_link(
486 struct dentry *dentry,
487 struct inode *inode,
488 struct delayed_call *done)
489{
490 char *link;
491 int error = -ENOMEM;
492
493 if (!dentry)
494 return ERR_PTR(-ECHILD);
495
496 link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
497 if (!link)
498 goto out_err;
499
500 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
501 if (unlikely(error))
502 goto out_kfree;
503
504 set_delayed_call(done, kfree_link, link);
505 return link;
506
507 out_kfree:
508 kfree(link);
509 out_err:
510 return ERR_PTR(error);
511}
512
513static uint32_t
514xfs_stat_blksize(
515 struct xfs_inode *ip)
516{
517 struct xfs_mount *mp = ip->i_mount;
518
519 /*
520 * If the file blocks are being allocated from a realtime volume, then
521 * always return the realtime extent size.
522 */
523 if (XFS_IS_REALTIME_INODE(ip))
524 return XFS_FSB_TO_B(mp, xfs_get_extsz_hint(ip));
525
526 /*
527 * Allow large block sizes to be reported to userspace programs if the
528 * "largeio" mount option is used.
529 *
530 * If compatibility mode is specified, simply return the basic unit of
531 * caching so that we don't get inefficient read/modify/write I/O from
532 * user apps. Otherwise....
533 *
534 * If the underlying volume is a stripe, then return the stripe width in
535 * bytes as the recommended I/O size. It is not a stripe and we've set a
536 * default buffered I/O size, return that, otherwise return the compat
537 * default.
538 */
539 if (xfs_has_large_iosize(mp)) {
540 if (mp->m_swidth)
541 return XFS_FSB_TO_B(mp, mp->m_swidth);
542 if (xfs_has_allocsize(mp))
543 return 1U << mp->m_allocsize_log;
544 }
545
546 return PAGE_SIZE;
547}
548
549STATIC int
550xfs_vn_getattr(
551 struct mnt_idmap *idmap,
552 const struct path *path,
553 struct kstat *stat,
554 u32 request_mask,
555 unsigned int query_flags)
556{
557 struct inode *inode = d_inode(path->dentry);
558 struct xfs_inode *ip = XFS_I(inode);
559 struct xfs_mount *mp = ip->i_mount;
560 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
561 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
562
563 trace_xfs_getattr(ip);
564
565 if (xfs_is_shutdown(mp))
566 return -EIO;
567
568 stat->size = XFS_ISIZE(ip);
569 stat->dev = inode->i_sb->s_dev;
570 stat->mode = inode->i_mode;
571 stat->nlink = inode->i_nlink;
572 stat->uid = vfsuid_into_kuid(vfsuid);
573 stat->gid = vfsgid_into_kgid(vfsgid);
574 stat->ino = ip->i_ino;
575 stat->atime = inode_get_atime(inode);
576 stat->mtime = inode_get_mtime(inode);
577 stat->ctime = inode_get_ctime(inode);
578 stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
579
580 if (xfs_has_v3inodes(mp)) {
581 if (request_mask & STATX_BTIME) {
582 stat->result_mask |= STATX_BTIME;
583 stat->btime = ip->i_crtime;
584 }
585 }
586
587 if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
588 stat->change_cookie = inode_query_iversion(inode);
589 stat->result_mask |= STATX_CHANGE_COOKIE;
590 }
591
592 /*
593 * Note: If you add another clause to set an attribute flag, please
594 * update attributes_mask below.
595 */
596 if (ip->i_diflags & XFS_DIFLAG_IMMUTABLE)
597 stat->attributes |= STATX_ATTR_IMMUTABLE;
598 if (ip->i_diflags & XFS_DIFLAG_APPEND)
599 stat->attributes |= STATX_ATTR_APPEND;
600 if (ip->i_diflags & XFS_DIFLAG_NODUMP)
601 stat->attributes |= STATX_ATTR_NODUMP;
602
603 stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
604 STATX_ATTR_APPEND |
605 STATX_ATTR_NODUMP);
606
607 switch (inode->i_mode & S_IFMT) {
608 case S_IFBLK:
609 case S_IFCHR:
610 stat->blksize = BLKDEV_IOSIZE;
611 stat->rdev = inode->i_rdev;
612 break;
613 case S_IFREG:
614 if (request_mask & STATX_DIOALIGN) {
615 struct xfs_buftarg *target = xfs_inode_buftarg(ip);
616 struct block_device *bdev = target->bt_bdev;
617
618 stat->result_mask |= STATX_DIOALIGN;
619 stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;
620 stat->dio_offset_align = bdev_logical_block_size(bdev);
621 }
622 fallthrough;
623 default:
624 stat->blksize = xfs_stat_blksize(ip);
625 stat->rdev = 0;
626 break;
627 }
628
629 return 0;
630}
631
632static int
633xfs_vn_change_ok(
634 struct mnt_idmap *idmap,
635 struct dentry *dentry,
636 struct iattr *iattr)
637{
638 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
639
640 if (xfs_is_readonly(mp))
641 return -EROFS;
642
643 if (xfs_is_shutdown(mp))
644 return -EIO;
645
646 return setattr_prepare(idmap, dentry, iattr);
647}
648
649/*
650 * Set non-size attributes of an inode.
651 *
652 * Caution: The caller of this function is responsible for calling
653 * setattr_prepare() or otherwise verifying the change is fine.
654 */
655static int
656xfs_setattr_nonsize(
657 struct mnt_idmap *idmap,
658 struct dentry *dentry,
659 struct xfs_inode *ip,
660 struct iattr *iattr)
661{
662 xfs_mount_t *mp = ip->i_mount;
663 struct inode *inode = VFS_I(ip);
664 int mask = iattr->ia_valid;
665 xfs_trans_t *tp;
666 int error;
667 kuid_t uid = GLOBAL_ROOT_UID;
668 kgid_t gid = GLOBAL_ROOT_GID;
669 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
670 struct xfs_dquot *old_udqp = NULL, *old_gdqp = NULL;
671
672 ASSERT((mask & ATTR_SIZE) == 0);
673
674 /*
675 * If disk quotas is on, we make sure that the dquots do exist on disk,
676 * before we start any other transactions. Trying to do this later
677 * is messy. We don't care to take a readlock to look at the ids
678 * in inode here, because we can't hold it across the trans_reserve.
679 * If the IDs do change before we take the ilock, we're covered
680 * because the i_*dquot fields will get updated anyway.
681 */
682 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
683 uint qflags = 0;
684
685 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
686 uid = from_vfsuid(idmap, i_user_ns(inode),
687 iattr->ia_vfsuid);
688 qflags |= XFS_QMOPT_UQUOTA;
689 } else {
690 uid = inode->i_uid;
691 }
692 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
693 gid = from_vfsgid(idmap, i_user_ns(inode),
694 iattr->ia_vfsgid);
695 qflags |= XFS_QMOPT_GQUOTA;
696 } else {
697 gid = inode->i_gid;
698 }
699
700 /*
701 * We take a reference when we initialize udqp and gdqp,
702 * so it is important that we never blindly double trip on
703 * the same variable. See xfs_create() for an example.
704 */
705 ASSERT(udqp == NULL);
706 ASSERT(gdqp == NULL);
707 error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_projid,
708 qflags, &udqp, &gdqp, NULL);
709 if (error)
710 return error;
711 }
712
713 error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL,
714 has_capability_noaudit(current, CAP_FOWNER), &tp);
715 if (error)
716 goto out_dqrele;
717
718 /*
719 * Register quota modifications in the transaction. Must be the owner
720 * or privileged. These IDs could have changed since we last looked at
721 * them. But, we're assured that if the ownership did change while we
722 * didn't have the inode locked, inode's dquot(s) would have changed
723 * also.
724 */
725 if (XFS_IS_UQUOTA_ON(mp) &&
726 i_uid_needs_update(idmap, iattr, inode)) {
727 ASSERT(udqp);
728 old_udqp = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp);
729 }
730 if (XFS_IS_GQUOTA_ON(mp) &&
731 i_gid_needs_update(idmap, iattr, inode)) {
732 ASSERT(xfs_has_pquotino(mp) || !XFS_IS_PQUOTA_ON(mp));
733 ASSERT(gdqp);
734 old_gdqp = xfs_qm_vop_chown(tp, ip, &ip->i_gdquot, gdqp);
735 }
736
737 setattr_copy(idmap, inode, iattr);
738 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
739
740 XFS_STATS_INC(mp, xs_ig_attrchg);
741
742 if (xfs_has_wsync(mp))
743 xfs_trans_set_sync(tp);
744 error = xfs_trans_commit(tp);
745
746 /*
747 * Release any dquot(s) the inode had kept before chown.
748 */
749 xfs_qm_dqrele(old_udqp);
750 xfs_qm_dqrele(old_gdqp);
751 xfs_qm_dqrele(udqp);
752 xfs_qm_dqrele(gdqp);
753
754 if (error)
755 return error;
756
757 /*
758 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
759 * update. We could avoid this with linked transactions
760 * and passing down the transaction pointer all the way
761 * to attr_set. No previous user of the generic
762 * Posix ACL code seems to care about this issue either.
763 */
764 if (mask & ATTR_MODE) {
765 error = posix_acl_chmod(idmap, dentry, inode->i_mode);
766 if (error)
767 return error;
768 }
769
770 return 0;
771
772out_dqrele:
773 xfs_qm_dqrele(udqp);
774 xfs_qm_dqrele(gdqp);
775 return error;
776}
777
778/*
779 * Truncate file. Must have write permission and not be a directory.
780 *
781 * Caution: The caller of this function is responsible for calling
782 * setattr_prepare() or otherwise verifying the change is fine.
783 */
784STATIC int
785xfs_setattr_size(
786 struct mnt_idmap *idmap,
787 struct dentry *dentry,
788 struct xfs_inode *ip,
789 struct iattr *iattr)
790{
791 struct xfs_mount *mp = ip->i_mount;
792 struct inode *inode = VFS_I(ip);
793 xfs_off_t oldsize, newsize;
794 struct xfs_trans *tp;
795 int error;
796 uint lock_flags = 0;
797 bool did_zeroing = false;
798
799 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
800 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
801 ASSERT(S_ISREG(inode->i_mode));
802 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
803 ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
804
805 oldsize = inode->i_size;
806 newsize = iattr->ia_size;
807
808 /*
809 * Short circuit the truncate case for zero length files.
810 */
811 if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
812 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
813 return 0;
814
815 /*
816 * Use the regular setattr path to update the timestamps.
817 */
818 iattr->ia_valid &= ~ATTR_SIZE;
819 return xfs_setattr_nonsize(idmap, dentry, ip, iattr);
820 }
821
822 /*
823 * Make sure that the dquots are attached to the inode.
824 */
825 error = xfs_qm_dqattach(ip);
826 if (error)
827 return error;
828
829 /*
830 * Wait for all direct I/O to complete.
831 */
832 inode_dio_wait(inode);
833
834 /*
835 * File data changes must be complete before we start the transaction to
836 * modify the inode. This needs to be done before joining the inode to
837 * the transaction because the inode cannot be unlocked once it is a
838 * part of the transaction.
839 *
840 * Start with zeroing any data beyond EOF that we may expose on file
841 * extension, or zeroing out the rest of the block on a downward
842 * truncate.
843 */
844 if (newsize > oldsize) {
845 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
846 error = xfs_zero_range(ip, oldsize, newsize - oldsize,
847 &did_zeroing);
848 } else {
849 /*
850 * iomap won't detect a dirty page over an unwritten block (or a
851 * cow block over a hole) and subsequently skips zeroing the
852 * newly post-EOF portion of the page. Flush the new EOF to
853 * convert the block before the pagecache truncate.
854 */
855 error = filemap_write_and_wait_range(inode->i_mapping, newsize,
856 newsize);
857 if (error)
858 return error;
859 error = xfs_truncate_page(ip, newsize, &did_zeroing);
860 }
861
862 if (error)
863 return error;
864
865 /*
866 * We've already locked out new page faults, so now we can safely remove
867 * pages from the page cache knowing they won't get refaulted until we
868 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
869 * complete. The truncate_setsize() call also cleans partial EOF page
870 * PTEs on extending truncates and hence ensures sub-page block size
871 * filesystems are correctly handled, too.
872 *
873 * We have to do all the page cache truncate work outside the
874 * transaction context as the "lock" order is page lock->log space
875 * reservation as defined by extent allocation in the writeback path.
876 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
877 * having already truncated the in-memory version of the file (i.e. made
878 * user visible changes). There's not much we can do about this, except
879 * to hope that the caller sees ENOMEM and retries the truncate
880 * operation.
881 *
882 * And we update in-core i_size and truncate page cache beyond newsize
883 * before writeback the [i_disk_size, newsize] range, so we're
884 * guaranteed not to write stale data past the new EOF on truncate down.
885 */
886 truncate_setsize(inode, newsize);
887
888 /*
889 * We are going to log the inode size change in this transaction so
890 * any previous writes that are beyond the on disk EOF and the new
891 * EOF that have not been written out need to be written here. If we
892 * do not write the data out, we expose ourselves to the null files
893 * problem. Note that this includes any block zeroing we did above;
894 * otherwise those blocks may not be zeroed after a crash.
895 */
896 if (did_zeroing ||
897 (newsize > ip->i_disk_size && oldsize != ip->i_disk_size)) {
898 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
899 ip->i_disk_size, newsize - 1);
900 if (error)
901 return error;
902 }
903
904 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
905 if (error)
906 return error;
907
908 lock_flags |= XFS_ILOCK_EXCL;
909 xfs_ilock(ip, XFS_ILOCK_EXCL);
910 xfs_trans_ijoin(tp, ip, 0);
911
912 /*
913 * Only change the c/mtime if we are changing the size or we are
914 * explicitly asked to change it. This handles the semantic difference
915 * between truncate() and ftruncate() as implemented in the VFS.
916 *
917 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
918 * special case where we need to update the times despite not having
919 * these flags set. For all other operations the VFS set these flags
920 * explicitly if it wants a timestamp update.
921 */
922 if (newsize != oldsize &&
923 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
924 iattr->ia_ctime = iattr->ia_mtime =
925 current_time(inode);
926 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
927 }
928
929 /*
930 * The first thing we do is set the size to new_size permanently on
931 * disk. This way we don't have to worry about anyone ever being able
932 * to look at the data being freed even in the face of a crash.
933 * What we're getting around here is the case where we free a block, it
934 * is allocated to another file, it is written to, and then we crash.
935 * If the new data gets written to the file but the log buffers
936 * containing the free and reallocation don't, then we'd end up with
937 * garbage in the blocks being freed. As long as we make the new size
938 * permanent before actually freeing any blocks it doesn't matter if
939 * they get written to.
940 */
941 ip->i_disk_size = newsize;
942 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
943
944 if (newsize <= oldsize) {
945 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
946 if (error)
947 goto out_trans_cancel;
948
949 /*
950 * Truncated "down", so we're removing references to old data
951 * here - if we delay flushing for a long time, we expose
952 * ourselves unduly to the notorious NULL files problem. So,
953 * we mark this inode and flush it when the file is closed,
954 * and do not wait the usual (long) time for writeout.
955 */
956 xfs_iflags_set(ip, XFS_ITRUNCATED);
957
958 /* A truncate down always removes post-EOF blocks. */
959 xfs_inode_clear_eofblocks_tag(ip);
960 }
961
962 ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
963 setattr_copy(idmap, inode, iattr);
964 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
965
966 XFS_STATS_INC(mp, xs_ig_attrchg);
967
968 if (xfs_has_wsync(mp))
969 xfs_trans_set_sync(tp);
970
971 error = xfs_trans_commit(tp);
972out_unlock:
973 if (lock_flags)
974 xfs_iunlock(ip, lock_flags);
975 return error;
976
977out_trans_cancel:
978 xfs_trans_cancel(tp);
979 goto out_unlock;
980}
981
982int
983xfs_vn_setattr_size(
984 struct mnt_idmap *idmap,
985 struct dentry *dentry,
986 struct iattr *iattr)
987{
988 struct xfs_inode *ip = XFS_I(d_inode(dentry));
989 int error;
990
991 trace_xfs_setattr(ip);
992
993 error = xfs_vn_change_ok(idmap, dentry, iattr);
994 if (error)
995 return error;
996 return xfs_setattr_size(idmap, dentry, ip, iattr);
997}
998
999STATIC int
1000xfs_vn_setattr(
1001 struct mnt_idmap *idmap,
1002 struct dentry *dentry,
1003 struct iattr *iattr)
1004{
1005 struct inode *inode = d_inode(dentry);
1006 struct xfs_inode *ip = XFS_I(inode);
1007 int error;
1008
1009 if (iattr->ia_valid & ATTR_SIZE) {
1010 uint iolock;
1011
1012 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1013 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1014
1015 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1016 if (error) {
1017 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1018 return error;
1019 }
1020
1021 error = xfs_vn_setattr_size(idmap, dentry, iattr);
1022 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1023 } else {
1024 trace_xfs_setattr(ip);
1025
1026 error = xfs_vn_change_ok(idmap, dentry, iattr);
1027 if (!error)
1028 error = xfs_setattr_nonsize(idmap, dentry, ip, iattr);
1029 }
1030
1031 return error;
1032}
1033
1034STATIC int
1035xfs_vn_update_time(
1036 struct inode *inode,
1037 int flags)
1038{
1039 struct xfs_inode *ip = XFS_I(inode);
1040 struct xfs_mount *mp = ip->i_mount;
1041 int log_flags = XFS_ILOG_TIMESTAMP;
1042 struct xfs_trans *tp;
1043 int error;
1044 struct timespec64 now;
1045
1046 trace_xfs_update_time(ip);
1047
1048 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1049 if (!((flags & S_VERSION) &&
1050 inode_maybe_inc_iversion(inode, false))) {
1051 generic_update_time(inode, flags);
1052 return 0;
1053 }
1054
1055 /* Capture the iversion update that just occurred */
1056 log_flags |= XFS_ILOG_CORE;
1057 }
1058
1059 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1060 if (error)
1061 return error;
1062
1063 xfs_ilock(ip, XFS_ILOCK_EXCL);
1064 if (flags & (S_CTIME|S_MTIME))
1065 now = inode_set_ctime_current(inode);
1066 else
1067 now = current_time(inode);
1068
1069 if (flags & S_MTIME)
1070 inode_set_mtime_to_ts(inode, now);
1071 if (flags & S_ATIME)
1072 inode_set_atime_to_ts(inode, now);
1073
1074 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1075 xfs_trans_log_inode(tp, ip, log_flags);
1076 return xfs_trans_commit(tp);
1077}
1078
1079STATIC int
1080xfs_vn_fiemap(
1081 struct inode *inode,
1082 struct fiemap_extent_info *fieinfo,
1083 u64 start,
1084 u64 length)
1085{
1086 int error;
1087
1088 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1089 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1090 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1091 error = iomap_fiemap(inode, fieinfo, start, length,
1092 &xfs_xattr_iomap_ops);
1093 } else {
1094 error = iomap_fiemap(inode, fieinfo, start, length,
1095 &xfs_read_iomap_ops);
1096 }
1097 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1098
1099 return error;
1100}
1101
1102STATIC int
1103xfs_vn_tmpfile(
1104 struct mnt_idmap *idmap,
1105 struct inode *dir,
1106 struct file *file,
1107 umode_t mode)
1108{
1109 int err = xfs_generic_create(idmap, dir, file->f_path.dentry, mode, 0, file);
1110
1111 return finish_open_simple(file, err);
1112}
1113
1114static const struct inode_operations xfs_inode_operations = {
1115 .get_inode_acl = xfs_get_acl,
1116 .set_acl = xfs_set_acl,
1117 .getattr = xfs_vn_getattr,
1118 .setattr = xfs_vn_setattr,
1119 .listxattr = xfs_vn_listxattr,
1120 .fiemap = xfs_vn_fiemap,
1121 .update_time = xfs_vn_update_time,
1122 .fileattr_get = xfs_fileattr_get,
1123 .fileattr_set = xfs_fileattr_set,
1124};
1125
1126static const struct inode_operations xfs_dir_inode_operations = {
1127 .create = xfs_vn_create,
1128 .lookup = xfs_vn_lookup,
1129 .link = xfs_vn_link,
1130 .unlink = xfs_vn_unlink,
1131 .symlink = xfs_vn_symlink,
1132 .mkdir = xfs_vn_mkdir,
1133 /*
1134 * Yes, XFS uses the same method for rmdir and unlink.
1135 *
1136 * There are some subtile differences deeper in the code,
1137 * but we use S_ISDIR to check for those.
1138 */
1139 .rmdir = xfs_vn_unlink,
1140 .mknod = xfs_vn_mknod,
1141 .rename = xfs_vn_rename,
1142 .get_inode_acl = xfs_get_acl,
1143 .set_acl = xfs_set_acl,
1144 .getattr = xfs_vn_getattr,
1145 .setattr = xfs_vn_setattr,
1146 .listxattr = xfs_vn_listxattr,
1147 .update_time = xfs_vn_update_time,
1148 .tmpfile = xfs_vn_tmpfile,
1149 .fileattr_get = xfs_fileattr_get,
1150 .fileattr_set = xfs_fileattr_set,
1151};
1152
1153static const struct inode_operations xfs_dir_ci_inode_operations = {
1154 .create = xfs_vn_create,
1155 .lookup = xfs_vn_ci_lookup,
1156 .link = xfs_vn_link,
1157 .unlink = xfs_vn_unlink,
1158 .symlink = xfs_vn_symlink,
1159 .mkdir = xfs_vn_mkdir,
1160 /*
1161 * Yes, XFS uses the same method for rmdir and unlink.
1162 *
1163 * There are some subtile differences deeper in the code,
1164 * but we use S_ISDIR to check for those.
1165 */
1166 .rmdir = xfs_vn_unlink,
1167 .mknod = xfs_vn_mknod,
1168 .rename = xfs_vn_rename,
1169 .get_inode_acl = xfs_get_acl,
1170 .set_acl = xfs_set_acl,
1171 .getattr = xfs_vn_getattr,
1172 .setattr = xfs_vn_setattr,
1173 .listxattr = xfs_vn_listxattr,
1174 .update_time = xfs_vn_update_time,
1175 .tmpfile = xfs_vn_tmpfile,
1176 .fileattr_get = xfs_fileattr_get,
1177 .fileattr_set = xfs_fileattr_set,
1178};
1179
1180static const struct inode_operations xfs_symlink_inode_operations = {
1181 .get_link = xfs_vn_get_link,
1182 .getattr = xfs_vn_getattr,
1183 .setattr = xfs_vn_setattr,
1184 .listxattr = xfs_vn_listxattr,
1185 .update_time = xfs_vn_update_time,
1186};
1187
1188/* Figure out if this file actually supports DAX. */
1189static bool
1190xfs_inode_supports_dax(
1191 struct xfs_inode *ip)
1192{
1193 struct xfs_mount *mp = ip->i_mount;
1194
1195 /* Only supported on regular files. */
1196 if (!S_ISREG(VFS_I(ip)->i_mode))
1197 return false;
1198
1199 /* Block size must match page size */
1200 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1201 return false;
1202
1203 /* Device has to support DAX too. */
1204 return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1205}
1206
1207static bool
1208xfs_inode_should_enable_dax(
1209 struct xfs_inode *ip)
1210{
1211 if (!IS_ENABLED(CONFIG_FS_DAX))
1212 return false;
1213 if (xfs_has_dax_never(ip->i_mount))
1214 return false;
1215 if (!xfs_inode_supports_dax(ip))
1216 return false;
1217 if (xfs_has_dax_always(ip->i_mount))
1218 return true;
1219 if (ip->i_diflags2 & XFS_DIFLAG2_DAX)
1220 return true;
1221 return false;
1222}
1223
1224void
1225xfs_diflags_to_iflags(
1226 struct xfs_inode *ip,
1227 bool init)
1228{
1229 struct inode *inode = VFS_I(ip);
1230 unsigned int xflags = xfs_ip2xflags(ip);
1231 unsigned int flags = 0;
1232
1233 ASSERT(!(IS_DAX(inode) && init));
1234
1235 if (xflags & FS_XFLAG_IMMUTABLE)
1236 flags |= S_IMMUTABLE;
1237 if (xflags & FS_XFLAG_APPEND)
1238 flags |= S_APPEND;
1239 if (xflags & FS_XFLAG_SYNC)
1240 flags |= S_SYNC;
1241 if (xflags & FS_XFLAG_NOATIME)
1242 flags |= S_NOATIME;
1243 if (init && xfs_inode_should_enable_dax(ip))
1244 flags |= S_DAX;
1245
1246 /*
1247 * S_DAX can only be set during inode initialization and is never set by
1248 * the VFS, so we cannot mask off S_DAX in i_flags.
1249 */
1250 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1251 inode->i_flags |= flags;
1252}
1253
1254/*
1255 * Initialize the Linux inode.
1256 *
1257 * When reading existing inodes from disk this is called directly from xfs_iget,
1258 * when creating a new inode it is called from xfs_init_new_inode after setting
1259 * up the inode. These callers have different criteria for clearing XFS_INEW, so
1260 * leave it up to the caller to deal with unlocking the inode appropriately.
1261 */
1262void
1263xfs_setup_inode(
1264 struct xfs_inode *ip)
1265{
1266 struct inode *inode = &ip->i_vnode;
1267 gfp_t gfp_mask;
1268
1269 inode->i_ino = ip->i_ino;
1270 inode->i_state |= I_NEW;
1271
1272 inode_sb_list_add(inode);
1273 /* make the inode look hashed for the writeback code */
1274 inode_fake_hash(inode);
1275
1276 i_size_write(inode, ip->i_disk_size);
1277 xfs_diflags_to_iflags(ip, true);
1278
1279 if (S_ISDIR(inode->i_mode)) {
1280 /*
1281 * We set the i_rwsem class here to avoid potential races with
1282 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1283 * after a filehandle lookup has already found the inode in
1284 * cache before it has been unlocked via unlock_new_inode().
1285 */
1286 lockdep_set_class(&inode->i_rwsem,
1287 &inode->i_sb->s_type->i_mutex_dir_key);
1288 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1289 } else {
1290 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1291 }
1292
1293 /*
1294 * Ensure all page cache allocations are done from GFP_NOFS context to
1295 * prevent direct reclaim recursion back into the filesystem and blowing
1296 * stacks or deadlocking.
1297 */
1298 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1299 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1300
1301 /*
1302 * For real-time inodes update the stable write flags to that of the RT
1303 * device instead of the data device.
1304 */
1305 if (S_ISREG(inode->i_mode) && XFS_IS_REALTIME_INODE(ip))
1306 xfs_update_stable_writes(ip);
1307
1308 /*
1309 * If there is no attribute fork no ACL can exist on this inode,
1310 * and it can't have any file capabilities attached to it either.
1311 */
1312 if (!xfs_inode_has_attr_fork(ip)) {
1313 inode_has_no_xattr(inode);
1314 cache_no_acl(inode);
1315 }
1316}
1317
1318void
1319xfs_setup_iops(
1320 struct xfs_inode *ip)
1321{
1322 struct inode *inode = &ip->i_vnode;
1323
1324 switch (inode->i_mode & S_IFMT) {
1325 case S_IFREG:
1326 inode->i_op = &xfs_inode_operations;
1327 inode->i_fop = &xfs_file_operations;
1328 if (IS_DAX(inode))
1329 inode->i_mapping->a_ops = &xfs_dax_aops;
1330 else
1331 inode->i_mapping->a_ops = &xfs_address_space_operations;
1332 break;
1333 case S_IFDIR:
1334 if (xfs_has_asciici(XFS_M(inode->i_sb)))
1335 inode->i_op = &xfs_dir_ci_inode_operations;
1336 else
1337 inode->i_op = &xfs_dir_inode_operations;
1338 inode->i_fop = &xfs_dir_file_operations;
1339 break;
1340 case S_IFLNK:
1341 inode->i_op = &xfs_symlink_inode_operations;
1342 break;
1343 default:
1344 inode->i_op = &xfs_inode_operations;
1345 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1346 break;
1347 }
1348}
1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_mount.h"
25#include "xfs_da_format.h"
26#include "xfs_inode.h"
27#include "xfs_bmap.h"
28#include "xfs_bmap_util.h"
29#include "xfs_acl.h"
30#include "xfs_quota.h"
31#include "xfs_error.h"
32#include "xfs_attr.h"
33#include "xfs_trans.h"
34#include "xfs_trace.h"
35#include "xfs_icache.h"
36#include "xfs_symlink.h"
37#include "xfs_da_btree.h"
38#include "xfs_dir2.h"
39#include "xfs_trans_space.h"
40#include "xfs_pnfs.h"
41#include "xfs_iomap.h"
42
43#include <linux/capability.h>
44#include <linux/xattr.h>
45#include <linux/posix_acl.h>
46#include <linux/security.h>
47#include <linux/iomap.h>
48#include <linux/slab.h>
49
50/*
51 * Directories have different lock order w.r.t. mmap_sem compared to regular
52 * files. This is due to readdir potentially triggering page faults on a user
53 * buffer inside filldir(), and this happens with the ilock on the directory
54 * held. For regular files, the lock order is the other way around - the
55 * mmap_sem is taken during the page fault, and then we lock the ilock to do
56 * block mapping. Hence we need a different class for the directory ilock so
57 * that lockdep can tell them apart.
58 */
59static struct lock_class_key xfs_nondir_ilock_class;
60static struct lock_class_key xfs_dir_ilock_class;
61
62static int
63xfs_initxattrs(
64 struct inode *inode,
65 const struct xattr *xattr_array,
66 void *fs_info)
67{
68 const struct xattr *xattr;
69 struct xfs_inode *ip = XFS_I(inode);
70 int error = 0;
71
72 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
73 error = xfs_attr_set(ip, xattr->name, xattr->value,
74 xattr->value_len, ATTR_SECURE);
75 if (error < 0)
76 break;
77 }
78 return error;
79}
80
81/*
82 * Hook in SELinux. This is not quite correct yet, what we really need
83 * here (as we do for default ACLs) is a mechanism by which creation of
84 * these attrs can be journalled at inode creation time (along with the
85 * inode, of course, such that log replay can't cause these to be lost).
86 */
87
88STATIC int
89xfs_init_security(
90 struct inode *inode,
91 struct inode *dir,
92 const struct qstr *qstr)
93{
94 return security_inode_init_security(inode, dir, qstr,
95 &xfs_initxattrs, NULL);
96}
97
98static void
99xfs_dentry_to_name(
100 struct xfs_name *namep,
101 struct dentry *dentry)
102{
103 namep->name = dentry->d_name.name;
104 namep->len = dentry->d_name.len;
105 namep->type = XFS_DIR3_FT_UNKNOWN;
106}
107
108static int
109xfs_dentry_mode_to_name(
110 struct xfs_name *namep,
111 struct dentry *dentry,
112 int mode)
113{
114 namep->name = dentry->d_name.name;
115 namep->len = dentry->d_name.len;
116 namep->type = xfs_mode_to_ftype(mode);
117
118 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
119 return -EFSCORRUPTED;
120
121 return 0;
122}
123
124STATIC void
125xfs_cleanup_inode(
126 struct inode *dir,
127 struct inode *inode,
128 struct dentry *dentry)
129{
130 struct xfs_name teardown;
131
132 /* Oh, the horror.
133 * If we can't add the ACL or we fail in
134 * xfs_init_security we must back out.
135 * ENOSPC can hit here, among other things.
136 */
137 xfs_dentry_to_name(&teardown, dentry);
138
139 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
140}
141
142STATIC int
143xfs_generic_create(
144 struct inode *dir,
145 struct dentry *dentry,
146 umode_t mode,
147 dev_t rdev,
148 bool tmpfile) /* unnamed file */
149{
150 struct inode *inode;
151 struct xfs_inode *ip = NULL;
152 struct posix_acl *default_acl, *acl;
153 struct xfs_name name;
154 int error;
155
156 /*
157 * Irix uses Missed'em'V split, but doesn't want to see
158 * the upper 5 bits of (14bit) major.
159 */
160 if (S_ISCHR(mode) || S_ISBLK(mode)) {
161 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
162 return -EINVAL;
163 rdev = sysv_encode_dev(rdev);
164 } else {
165 rdev = 0;
166 }
167
168 error = posix_acl_create(dir, &mode, &default_acl, &acl);
169 if (error)
170 return error;
171
172 /* Verify mode is valid also for tmpfile case */
173 error = xfs_dentry_mode_to_name(&name, dentry, mode);
174 if (unlikely(error))
175 goto out_free_acl;
176
177 if (!tmpfile) {
178 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
179 } else {
180 error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip);
181 }
182 if (unlikely(error))
183 goto out_free_acl;
184
185 inode = VFS_I(ip);
186
187 error = xfs_init_security(inode, dir, &dentry->d_name);
188 if (unlikely(error))
189 goto out_cleanup_inode;
190
191#ifdef CONFIG_XFS_POSIX_ACL
192 if (default_acl) {
193 error = xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
194 if (error)
195 goto out_cleanup_inode;
196 }
197 if (acl) {
198 error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
199 if (error)
200 goto out_cleanup_inode;
201 }
202#endif
203
204 xfs_setup_iops(ip);
205
206 if (tmpfile)
207 d_tmpfile(dentry, inode);
208 else
209 d_instantiate(dentry, inode);
210
211 xfs_finish_inode_setup(ip);
212
213 out_free_acl:
214 if (default_acl)
215 posix_acl_release(default_acl);
216 if (acl)
217 posix_acl_release(acl);
218 return error;
219
220 out_cleanup_inode:
221 xfs_finish_inode_setup(ip);
222 if (!tmpfile)
223 xfs_cleanup_inode(dir, inode, dentry);
224 iput(inode);
225 goto out_free_acl;
226}
227
228STATIC int
229xfs_vn_mknod(
230 struct inode *dir,
231 struct dentry *dentry,
232 umode_t mode,
233 dev_t rdev)
234{
235 return xfs_generic_create(dir, dentry, mode, rdev, false);
236}
237
238STATIC int
239xfs_vn_create(
240 struct inode *dir,
241 struct dentry *dentry,
242 umode_t mode,
243 bool flags)
244{
245 return xfs_vn_mknod(dir, dentry, mode, 0);
246}
247
248STATIC int
249xfs_vn_mkdir(
250 struct inode *dir,
251 struct dentry *dentry,
252 umode_t mode)
253{
254 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
255}
256
257STATIC struct dentry *
258xfs_vn_lookup(
259 struct inode *dir,
260 struct dentry *dentry,
261 unsigned int flags)
262{
263 struct xfs_inode *cip;
264 struct xfs_name name;
265 int error;
266
267 if (dentry->d_name.len >= MAXNAMELEN)
268 return ERR_PTR(-ENAMETOOLONG);
269
270 xfs_dentry_to_name(&name, dentry);
271 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
272 if (unlikely(error)) {
273 if (unlikely(error != -ENOENT))
274 return ERR_PTR(error);
275 d_add(dentry, NULL);
276 return NULL;
277 }
278
279 return d_splice_alias(VFS_I(cip), dentry);
280}
281
282STATIC struct dentry *
283xfs_vn_ci_lookup(
284 struct inode *dir,
285 struct dentry *dentry,
286 unsigned int flags)
287{
288 struct xfs_inode *ip;
289 struct xfs_name xname;
290 struct xfs_name ci_name;
291 struct qstr dname;
292 int error;
293
294 if (dentry->d_name.len >= MAXNAMELEN)
295 return ERR_PTR(-ENAMETOOLONG);
296
297 xfs_dentry_to_name(&xname, dentry);
298 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
299 if (unlikely(error)) {
300 if (unlikely(error != -ENOENT))
301 return ERR_PTR(error);
302 /*
303 * call d_add(dentry, NULL) here when d_drop_negative_children
304 * is called in xfs_vn_mknod (ie. allow negative dentries
305 * with CI filesystems).
306 */
307 return NULL;
308 }
309
310 /* if exact match, just splice and exit */
311 if (!ci_name.name)
312 return d_splice_alias(VFS_I(ip), dentry);
313
314 /* else case-insensitive match... */
315 dname.name = ci_name.name;
316 dname.len = ci_name.len;
317 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
318 kmem_free(ci_name.name);
319 return dentry;
320}
321
322STATIC int
323xfs_vn_link(
324 struct dentry *old_dentry,
325 struct inode *dir,
326 struct dentry *dentry)
327{
328 struct inode *inode = d_inode(old_dentry);
329 struct xfs_name name;
330 int error;
331
332 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
333 if (unlikely(error))
334 return error;
335
336 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
337 if (unlikely(error))
338 return error;
339
340 ihold(inode);
341 d_instantiate(dentry, inode);
342 return 0;
343}
344
345STATIC int
346xfs_vn_unlink(
347 struct inode *dir,
348 struct dentry *dentry)
349{
350 struct xfs_name name;
351 int error;
352
353 xfs_dentry_to_name(&name, dentry);
354
355 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
356 if (error)
357 return error;
358
359 /*
360 * With unlink, the VFS makes the dentry "negative": no inode,
361 * but still hashed. This is incompatible with case-insensitive
362 * mode, so invalidate (unhash) the dentry in CI-mode.
363 */
364 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
365 d_invalidate(dentry);
366 return 0;
367}
368
369STATIC int
370xfs_vn_symlink(
371 struct inode *dir,
372 struct dentry *dentry,
373 const char *symname)
374{
375 struct inode *inode;
376 struct xfs_inode *cip = NULL;
377 struct xfs_name name;
378 int error;
379 umode_t mode;
380
381 mode = S_IFLNK |
382 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
383 error = xfs_dentry_mode_to_name(&name, dentry, mode);
384 if (unlikely(error))
385 goto out;
386
387 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
388 if (unlikely(error))
389 goto out;
390
391 inode = VFS_I(cip);
392
393 error = xfs_init_security(inode, dir, &dentry->d_name);
394 if (unlikely(error))
395 goto out_cleanup_inode;
396
397 xfs_setup_iops(cip);
398
399 d_instantiate(dentry, inode);
400 xfs_finish_inode_setup(cip);
401 return 0;
402
403 out_cleanup_inode:
404 xfs_finish_inode_setup(cip);
405 xfs_cleanup_inode(dir, inode, dentry);
406 iput(inode);
407 out:
408 return error;
409}
410
411STATIC int
412xfs_vn_rename(
413 struct inode *odir,
414 struct dentry *odentry,
415 struct inode *ndir,
416 struct dentry *ndentry,
417 unsigned int flags)
418{
419 struct inode *new_inode = d_inode(ndentry);
420 int omode = 0;
421 int error;
422 struct xfs_name oname;
423 struct xfs_name nname;
424
425 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
426 return -EINVAL;
427
428 /* if we are exchanging files, we need to set i_mode of both files */
429 if (flags & RENAME_EXCHANGE)
430 omode = d_inode(ndentry)->i_mode;
431
432 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
433 if (omode && unlikely(error))
434 return error;
435
436 error = xfs_dentry_mode_to_name(&nname, ndentry,
437 d_inode(odentry)->i_mode);
438 if (unlikely(error))
439 return error;
440
441 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
442 XFS_I(ndir), &nname,
443 new_inode ? XFS_I(new_inode) : NULL, flags);
444}
445
446/*
447 * careful here - this function can get called recursively, so
448 * we need to be very careful about how much stack we use.
449 * uio is kmalloced for this reason...
450 */
451STATIC const char *
452xfs_vn_get_link(
453 struct dentry *dentry,
454 struct inode *inode,
455 struct delayed_call *done)
456{
457 char *link;
458 int error = -ENOMEM;
459
460 if (!dentry)
461 return ERR_PTR(-ECHILD);
462
463 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
464 if (!link)
465 goto out_err;
466
467 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
468 if (unlikely(error))
469 goto out_kfree;
470
471 set_delayed_call(done, kfree_link, link);
472 return link;
473
474 out_kfree:
475 kfree(link);
476 out_err:
477 return ERR_PTR(error);
478}
479
480STATIC const char *
481xfs_vn_get_link_inline(
482 struct dentry *dentry,
483 struct inode *inode,
484 struct delayed_call *done)
485{
486 ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
487 return XFS_I(inode)->i_df.if_u1.if_data;
488}
489
490STATIC int
491xfs_vn_getattr(
492 struct vfsmount *mnt,
493 struct dentry *dentry,
494 struct kstat *stat)
495{
496 struct inode *inode = d_inode(dentry);
497 struct xfs_inode *ip = XFS_I(inode);
498 struct xfs_mount *mp = ip->i_mount;
499
500 trace_xfs_getattr(ip);
501
502 if (XFS_FORCED_SHUTDOWN(mp))
503 return -EIO;
504
505 stat->size = XFS_ISIZE(ip);
506 stat->dev = inode->i_sb->s_dev;
507 stat->mode = inode->i_mode;
508 stat->nlink = inode->i_nlink;
509 stat->uid = inode->i_uid;
510 stat->gid = inode->i_gid;
511 stat->ino = ip->i_ino;
512 stat->atime = inode->i_atime;
513 stat->mtime = inode->i_mtime;
514 stat->ctime = inode->i_ctime;
515 stat->blocks =
516 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
517
518
519 switch (inode->i_mode & S_IFMT) {
520 case S_IFBLK:
521 case S_IFCHR:
522 stat->blksize = BLKDEV_IOSIZE;
523 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
524 sysv_minor(ip->i_df.if_u2.if_rdev));
525 break;
526 default:
527 if (XFS_IS_REALTIME_INODE(ip)) {
528 /*
529 * If the file blocks are being allocated from a
530 * realtime volume, then return the inode's realtime
531 * extent size or the realtime volume's extent size.
532 */
533 stat->blksize =
534 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
535 } else
536 stat->blksize = xfs_preferred_iosize(mp);
537 stat->rdev = 0;
538 break;
539 }
540
541 return 0;
542}
543
544static void
545xfs_setattr_mode(
546 struct xfs_inode *ip,
547 struct iattr *iattr)
548{
549 struct inode *inode = VFS_I(ip);
550 umode_t mode = iattr->ia_mode;
551
552 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
553
554 inode->i_mode &= S_IFMT;
555 inode->i_mode |= mode & ~S_IFMT;
556}
557
558void
559xfs_setattr_time(
560 struct xfs_inode *ip,
561 struct iattr *iattr)
562{
563 struct inode *inode = VFS_I(ip);
564
565 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
566
567 if (iattr->ia_valid & ATTR_ATIME)
568 inode->i_atime = iattr->ia_atime;
569 if (iattr->ia_valid & ATTR_CTIME)
570 inode->i_ctime = iattr->ia_ctime;
571 if (iattr->ia_valid & ATTR_MTIME)
572 inode->i_mtime = iattr->ia_mtime;
573}
574
575static int
576xfs_vn_change_ok(
577 struct dentry *dentry,
578 struct iattr *iattr)
579{
580 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
581
582 if (mp->m_flags & XFS_MOUNT_RDONLY)
583 return -EROFS;
584
585 if (XFS_FORCED_SHUTDOWN(mp))
586 return -EIO;
587
588 return setattr_prepare(dentry, iattr);
589}
590
591/*
592 * Set non-size attributes of an inode.
593 *
594 * Caution: The caller of this function is responsible for calling
595 * setattr_prepare() or otherwise verifying the change is fine.
596 */
597int
598xfs_setattr_nonsize(
599 struct xfs_inode *ip,
600 struct iattr *iattr,
601 int flags)
602{
603 xfs_mount_t *mp = ip->i_mount;
604 struct inode *inode = VFS_I(ip);
605 int mask = iattr->ia_valid;
606 xfs_trans_t *tp;
607 int error;
608 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
609 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
610 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
611 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
612
613 ASSERT((mask & ATTR_SIZE) == 0);
614
615 /*
616 * If disk quotas is on, we make sure that the dquots do exist on disk,
617 * before we start any other transactions. Trying to do this later
618 * is messy. We don't care to take a readlock to look at the ids
619 * in inode here, because we can't hold it across the trans_reserve.
620 * If the IDs do change before we take the ilock, we're covered
621 * because the i_*dquot fields will get updated anyway.
622 */
623 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
624 uint qflags = 0;
625
626 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
627 uid = iattr->ia_uid;
628 qflags |= XFS_QMOPT_UQUOTA;
629 } else {
630 uid = inode->i_uid;
631 }
632 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
633 gid = iattr->ia_gid;
634 qflags |= XFS_QMOPT_GQUOTA;
635 } else {
636 gid = inode->i_gid;
637 }
638
639 /*
640 * We take a reference when we initialize udqp and gdqp,
641 * so it is important that we never blindly double trip on
642 * the same variable. See xfs_create() for an example.
643 */
644 ASSERT(udqp == NULL);
645 ASSERT(gdqp == NULL);
646 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
647 xfs_kgid_to_gid(gid),
648 xfs_get_projid(ip),
649 qflags, &udqp, &gdqp, NULL);
650 if (error)
651 return error;
652 }
653
654 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
655 if (error)
656 goto out_dqrele;
657
658 xfs_ilock(ip, XFS_ILOCK_EXCL);
659 xfs_trans_ijoin(tp, ip, 0);
660
661 /*
662 * Change file ownership. Must be the owner or privileged.
663 */
664 if (mask & (ATTR_UID|ATTR_GID)) {
665 /*
666 * These IDs could have changed since we last looked at them.
667 * But, we're assured that if the ownership did change
668 * while we didn't have the inode locked, inode's dquot(s)
669 * would have changed also.
670 */
671 iuid = inode->i_uid;
672 igid = inode->i_gid;
673 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
674 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
675
676 /*
677 * Do a quota reservation only if uid/gid is actually
678 * going to change.
679 */
680 if (XFS_IS_QUOTA_RUNNING(mp) &&
681 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
682 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
683 ASSERT(tp);
684 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
685 NULL, capable(CAP_FOWNER) ?
686 XFS_QMOPT_FORCE_RES : 0);
687 if (error) /* out of quota */
688 goto out_cancel;
689 }
690 }
691
692 /*
693 * Change file ownership. Must be the owner or privileged.
694 */
695 if (mask & (ATTR_UID|ATTR_GID)) {
696 /*
697 * CAP_FSETID overrides the following restrictions:
698 *
699 * The set-user-ID and set-group-ID bits of a file will be
700 * cleared upon successful return from chown()
701 */
702 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
703 !capable(CAP_FSETID))
704 inode->i_mode &= ~(S_ISUID|S_ISGID);
705
706 /*
707 * Change the ownerships and register quota modifications
708 * in the transaction.
709 */
710 if (!uid_eq(iuid, uid)) {
711 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
712 ASSERT(mask & ATTR_UID);
713 ASSERT(udqp);
714 olddquot1 = xfs_qm_vop_chown(tp, ip,
715 &ip->i_udquot, udqp);
716 }
717 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
718 inode->i_uid = uid;
719 }
720 if (!gid_eq(igid, gid)) {
721 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
722 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
723 !XFS_IS_PQUOTA_ON(mp));
724 ASSERT(mask & ATTR_GID);
725 ASSERT(gdqp);
726 olddquot2 = xfs_qm_vop_chown(tp, ip,
727 &ip->i_gdquot, gdqp);
728 }
729 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
730 inode->i_gid = gid;
731 }
732 }
733
734 if (mask & ATTR_MODE)
735 xfs_setattr_mode(ip, iattr);
736 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
737 xfs_setattr_time(ip, iattr);
738
739 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
740
741 XFS_STATS_INC(mp, xs_ig_attrchg);
742
743 if (mp->m_flags & XFS_MOUNT_WSYNC)
744 xfs_trans_set_sync(tp);
745 error = xfs_trans_commit(tp);
746
747 xfs_iunlock(ip, XFS_ILOCK_EXCL);
748
749 /*
750 * Release any dquot(s) the inode had kept before chown.
751 */
752 xfs_qm_dqrele(olddquot1);
753 xfs_qm_dqrele(olddquot2);
754 xfs_qm_dqrele(udqp);
755 xfs_qm_dqrele(gdqp);
756
757 if (error)
758 return error;
759
760 /*
761 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
762 * update. We could avoid this with linked transactions
763 * and passing down the transaction pointer all the way
764 * to attr_set. No previous user of the generic
765 * Posix ACL code seems to care about this issue either.
766 */
767 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
768 error = posix_acl_chmod(inode, inode->i_mode);
769 if (error)
770 return error;
771 }
772
773 return 0;
774
775out_cancel:
776 xfs_trans_cancel(tp);
777out_dqrele:
778 xfs_qm_dqrele(udqp);
779 xfs_qm_dqrele(gdqp);
780 return error;
781}
782
783int
784xfs_vn_setattr_nonsize(
785 struct dentry *dentry,
786 struct iattr *iattr)
787{
788 struct xfs_inode *ip = XFS_I(d_inode(dentry));
789 int error;
790
791 trace_xfs_setattr(ip);
792
793 error = xfs_vn_change_ok(dentry, iattr);
794 if (error)
795 return error;
796 return xfs_setattr_nonsize(ip, iattr, 0);
797}
798
799/*
800 * Truncate file. Must have write permission and not be a directory.
801 *
802 * Caution: The caller of this function is responsible for calling
803 * setattr_prepare() or otherwise verifying the change is fine.
804 */
805int
806xfs_setattr_size(
807 struct xfs_inode *ip,
808 struct iattr *iattr)
809{
810 struct xfs_mount *mp = ip->i_mount;
811 struct inode *inode = VFS_I(ip);
812 xfs_off_t oldsize, newsize;
813 struct xfs_trans *tp;
814 int error;
815 uint lock_flags = 0;
816 bool did_zeroing = false;
817
818 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
819 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
820 ASSERT(S_ISREG(inode->i_mode));
821 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
822 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
823
824 oldsize = inode->i_size;
825 newsize = iattr->ia_size;
826
827 /*
828 * Short circuit the truncate case for zero length files.
829 */
830 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
831 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
832 return 0;
833
834 /*
835 * Use the regular setattr path to update the timestamps.
836 */
837 iattr->ia_valid &= ~ATTR_SIZE;
838 return xfs_setattr_nonsize(ip, iattr, 0);
839 }
840
841 /*
842 * Make sure that the dquots are attached to the inode.
843 */
844 error = xfs_qm_dqattach(ip, 0);
845 if (error)
846 return error;
847
848 /*
849 * Wait for all direct I/O to complete.
850 */
851 inode_dio_wait(inode);
852
853 /*
854 * File data changes must be complete before we start the transaction to
855 * modify the inode. This needs to be done before joining the inode to
856 * the transaction because the inode cannot be unlocked once it is a
857 * part of the transaction.
858 *
859 * Start with zeroing any data beyond EOF that we may expose on file
860 * extension, or zeroing out the rest of the block on a downward
861 * truncate.
862 */
863 if (newsize > oldsize) {
864 error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
865 } else {
866 error = iomap_truncate_page(inode, newsize, &did_zeroing,
867 &xfs_iomap_ops);
868 }
869
870 if (error)
871 return error;
872
873 /*
874 * We are going to log the inode size change in this transaction so
875 * any previous writes that are beyond the on disk EOF and the new
876 * EOF that have not been written out need to be written here. If we
877 * do not write the data out, we expose ourselves to the null files
878 * problem. Note that this includes any block zeroing we did above;
879 * otherwise those blocks may not be zeroed after a crash.
880 */
881 if (did_zeroing ||
882 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
883 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
884 ip->i_d.di_size, newsize);
885 if (error)
886 return error;
887 }
888
889 /*
890 * We've already locked out new page faults, so now we can safely remove
891 * pages from the page cache knowing they won't get refaulted until we
892 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
893 * complete. The truncate_setsize() call also cleans partial EOF page
894 * PTEs on extending truncates and hence ensures sub-page block size
895 * filesystems are correctly handled, too.
896 *
897 * We have to do all the page cache truncate work outside the
898 * transaction context as the "lock" order is page lock->log space
899 * reservation as defined by extent allocation in the writeback path.
900 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
901 * having already truncated the in-memory version of the file (i.e. made
902 * user visible changes). There's not much we can do about this, except
903 * to hope that the caller sees ENOMEM and retries the truncate
904 * operation.
905 */
906 truncate_setsize(inode, newsize);
907
908 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
909 if (error)
910 return error;
911
912 lock_flags |= XFS_ILOCK_EXCL;
913 xfs_ilock(ip, XFS_ILOCK_EXCL);
914 xfs_trans_ijoin(tp, ip, 0);
915
916 /*
917 * Only change the c/mtime if we are changing the size or we are
918 * explicitly asked to change it. This handles the semantic difference
919 * between truncate() and ftruncate() as implemented in the VFS.
920 *
921 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
922 * special case where we need to update the times despite not having
923 * these flags set. For all other operations the VFS set these flags
924 * explicitly if it wants a timestamp update.
925 */
926 if (newsize != oldsize &&
927 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
928 iattr->ia_ctime = iattr->ia_mtime =
929 current_time(inode);
930 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
931 }
932
933 /*
934 * The first thing we do is set the size to new_size permanently on
935 * disk. This way we don't have to worry about anyone ever being able
936 * to look at the data being freed even in the face of a crash.
937 * What we're getting around here is the case where we free a block, it
938 * is allocated to another file, it is written to, and then we crash.
939 * If the new data gets written to the file but the log buffers
940 * containing the free and reallocation don't, then we'd end up with
941 * garbage in the blocks being freed. As long as we make the new size
942 * permanent before actually freeing any blocks it doesn't matter if
943 * they get written to.
944 */
945 ip->i_d.di_size = newsize;
946 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
947
948 if (newsize <= oldsize) {
949 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
950 if (error)
951 goto out_trans_cancel;
952
953 /*
954 * Truncated "down", so we're removing references to old data
955 * here - if we delay flushing for a long time, we expose
956 * ourselves unduly to the notorious NULL files problem. So,
957 * we mark this inode and flush it when the file is closed,
958 * and do not wait the usual (long) time for writeout.
959 */
960 xfs_iflags_set(ip, XFS_ITRUNCATED);
961
962 /* A truncate down always removes post-EOF blocks. */
963 xfs_inode_clear_eofblocks_tag(ip);
964 }
965
966 if (iattr->ia_valid & ATTR_MODE)
967 xfs_setattr_mode(ip, iattr);
968 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
969 xfs_setattr_time(ip, iattr);
970
971 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
972
973 XFS_STATS_INC(mp, xs_ig_attrchg);
974
975 if (mp->m_flags & XFS_MOUNT_WSYNC)
976 xfs_trans_set_sync(tp);
977
978 error = xfs_trans_commit(tp);
979out_unlock:
980 if (lock_flags)
981 xfs_iunlock(ip, lock_flags);
982 return error;
983
984out_trans_cancel:
985 xfs_trans_cancel(tp);
986 goto out_unlock;
987}
988
989int
990xfs_vn_setattr_size(
991 struct dentry *dentry,
992 struct iattr *iattr)
993{
994 struct xfs_inode *ip = XFS_I(d_inode(dentry));
995 int error;
996
997 trace_xfs_setattr(ip);
998
999 error = xfs_vn_change_ok(dentry, iattr);
1000 if (error)
1001 return error;
1002 return xfs_setattr_size(ip, iattr);
1003}
1004
1005STATIC int
1006xfs_vn_setattr(
1007 struct dentry *dentry,
1008 struct iattr *iattr)
1009{
1010 int error;
1011
1012 if (iattr->ia_valid & ATTR_SIZE) {
1013 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1014 uint iolock = XFS_IOLOCK_EXCL;
1015
1016 error = xfs_break_layouts(d_inode(dentry), &iolock);
1017 if (error)
1018 return error;
1019
1020 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1021 error = xfs_vn_setattr_size(dentry, iattr);
1022 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1023 } else {
1024 error = xfs_vn_setattr_nonsize(dentry, iattr);
1025 }
1026
1027 return error;
1028}
1029
1030STATIC int
1031xfs_vn_update_time(
1032 struct inode *inode,
1033 struct timespec *now,
1034 int flags)
1035{
1036 struct xfs_inode *ip = XFS_I(inode);
1037 struct xfs_mount *mp = ip->i_mount;
1038 struct xfs_trans *tp;
1039 int error;
1040
1041 trace_xfs_update_time(ip);
1042
1043 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1044 if (error)
1045 return error;
1046
1047 xfs_ilock(ip, XFS_ILOCK_EXCL);
1048 if (flags & S_CTIME)
1049 inode->i_ctime = *now;
1050 if (flags & S_MTIME)
1051 inode->i_mtime = *now;
1052 if (flags & S_ATIME)
1053 inode->i_atime = *now;
1054
1055 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1056 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
1057 return xfs_trans_commit(tp);
1058}
1059
1060STATIC int
1061xfs_vn_fiemap(
1062 struct inode *inode,
1063 struct fiemap_extent_info *fieinfo,
1064 u64 start,
1065 u64 length)
1066{
1067 int error;
1068
1069 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1070 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1071 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1072 error = iomap_fiemap(inode, fieinfo, start, length,
1073 &xfs_xattr_iomap_ops);
1074 } else {
1075 error = iomap_fiemap(inode, fieinfo, start, length,
1076 &xfs_iomap_ops);
1077 }
1078 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1079
1080 return error;
1081}
1082
1083STATIC int
1084xfs_vn_tmpfile(
1085 struct inode *dir,
1086 struct dentry *dentry,
1087 umode_t mode)
1088{
1089 return xfs_generic_create(dir, dentry, mode, 0, true);
1090}
1091
1092static const struct inode_operations xfs_inode_operations = {
1093 .get_acl = xfs_get_acl,
1094 .set_acl = xfs_set_acl,
1095 .getattr = xfs_vn_getattr,
1096 .setattr = xfs_vn_setattr,
1097 .listxattr = xfs_vn_listxattr,
1098 .fiemap = xfs_vn_fiemap,
1099 .update_time = xfs_vn_update_time,
1100};
1101
1102static const struct inode_operations xfs_dir_inode_operations = {
1103 .create = xfs_vn_create,
1104 .lookup = xfs_vn_lookup,
1105 .link = xfs_vn_link,
1106 .unlink = xfs_vn_unlink,
1107 .symlink = xfs_vn_symlink,
1108 .mkdir = xfs_vn_mkdir,
1109 /*
1110 * Yes, XFS uses the same method for rmdir and unlink.
1111 *
1112 * There are some subtile differences deeper in the code,
1113 * but we use S_ISDIR to check for those.
1114 */
1115 .rmdir = xfs_vn_unlink,
1116 .mknod = xfs_vn_mknod,
1117 .rename = xfs_vn_rename,
1118 .get_acl = xfs_get_acl,
1119 .set_acl = xfs_set_acl,
1120 .getattr = xfs_vn_getattr,
1121 .setattr = xfs_vn_setattr,
1122 .listxattr = xfs_vn_listxattr,
1123 .update_time = xfs_vn_update_time,
1124 .tmpfile = xfs_vn_tmpfile,
1125};
1126
1127static const struct inode_operations xfs_dir_ci_inode_operations = {
1128 .create = xfs_vn_create,
1129 .lookup = xfs_vn_ci_lookup,
1130 .link = xfs_vn_link,
1131 .unlink = xfs_vn_unlink,
1132 .symlink = xfs_vn_symlink,
1133 .mkdir = xfs_vn_mkdir,
1134 /*
1135 * Yes, XFS uses the same method for rmdir and unlink.
1136 *
1137 * There are some subtile differences deeper in the code,
1138 * but we use S_ISDIR to check for those.
1139 */
1140 .rmdir = xfs_vn_unlink,
1141 .mknod = xfs_vn_mknod,
1142 .rename = xfs_vn_rename,
1143 .get_acl = xfs_get_acl,
1144 .set_acl = xfs_set_acl,
1145 .getattr = xfs_vn_getattr,
1146 .setattr = xfs_vn_setattr,
1147 .listxattr = xfs_vn_listxattr,
1148 .update_time = xfs_vn_update_time,
1149 .tmpfile = xfs_vn_tmpfile,
1150};
1151
1152static const struct inode_operations xfs_symlink_inode_operations = {
1153 .get_link = xfs_vn_get_link,
1154 .getattr = xfs_vn_getattr,
1155 .setattr = xfs_vn_setattr,
1156 .listxattr = xfs_vn_listxattr,
1157 .update_time = xfs_vn_update_time,
1158};
1159
1160static const struct inode_operations xfs_inline_symlink_inode_operations = {
1161 .get_link = xfs_vn_get_link_inline,
1162 .getattr = xfs_vn_getattr,
1163 .setattr = xfs_vn_setattr,
1164 .listxattr = xfs_vn_listxattr,
1165 .update_time = xfs_vn_update_time,
1166};
1167
1168STATIC void
1169xfs_diflags_to_iflags(
1170 struct inode *inode,
1171 struct xfs_inode *ip)
1172{
1173 uint16_t flags = ip->i_d.di_flags;
1174
1175 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1176 S_NOATIME | S_DAX);
1177
1178 if (flags & XFS_DIFLAG_IMMUTABLE)
1179 inode->i_flags |= S_IMMUTABLE;
1180 if (flags & XFS_DIFLAG_APPEND)
1181 inode->i_flags |= S_APPEND;
1182 if (flags & XFS_DIFLAG_SYNC)
1183 inode->i_flags |= S_SYNC;
1184 if (flags & XFS_DIFLAG_NOATIME)
1185 inode->i_flags |= S_NOATIME;
1186 if (S_ISREG(inode->i_mode) &&
1187 ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE &&
1188 !xfs_is_reflink_inode(ip) &&
1189 (ip->i_mount->m_flags & XFS_MOUNT_DAX ||
1190 ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1191 inode->i_flags |= S_DAX;
1192}
1193
1194/*
1195 * Initialize the Linux inode.
1196 *
1197 * When reading existing inodes from disk this is called directly from xfs_iget,
1198 * when creating a new inode it is called from xfs_ialloc after setting up the
1199 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1200 * it up to the caller to deal with unlocking the inode appropriately.
1201 */
1202void
1203xfs_setup_inode(
1204 struct xfs_inode *ip)
1205{
1206 struct inode *inode = &ip->i_vnode;
1207 gfp_t gfp_mask;
1208
1209 inode->i_ino = ip->i_ino;
1210 inode->i_state = I_NEW;
1211
1212 inode_sb_list_add(inode);
1213 /* make the inode look hashed for the writeback code */
1214 hlist_add_fake(&inode->i_hash);
1215
1216 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1217 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1218
1219 switch (inode->i_mode & S_IFMT) {
1220 case S_IFBLK:
1221 case S_IFCHR:
1222 inode->i_rdev =
1223 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
1224 sysv_minor(ip->i_df.if_u2.if_rdev));
1225 break;
1226 default:
1227 inode->i_rdev = 0;
1228 break;
1229 }
1230
1231 i_size_write(inode, ip->i_d.di_size);
1232 xfs_diflags_to_iflags(inode, ip);
1233
1234 if (S_ISDIR(inode->i_mode)) {
1235 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1236 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1237 } else {
1238 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1239 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1240 }
1241
1242 /*
1243 * Ensure all page cache allocations are done from GFP_NOFS context to
1244 * prevent direct reclaim recursion back into the filesystem and blowing
1245 * stacks or deadlocking.
1246 */
1247 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1248 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1249
1250 /*
1251 * If there is no attribute fork no ACL can exist on this inode,
1252 * and it can't have any file capabilities attached to it either.
1253 */
1254 if (!XFS_IFORK_Q(ip)) {
1255 inode_has_no_xattr(inode);
1256 cache_no_acl(inode);
1257 }
1258}
1259
1260void
1261xfs_setup_iops(
1262 struct xfs_inode *ip)
1263{
1264 struct inode *inode = &ip->i_vnode;
1265
1266 switch (inode->i_mode & S_IFMT) {
1267 case S_IFREG:
1268 inode->i_op = &xfs_inode_operations;
1269 inode->i_fop = &xfs_file_operations;
1270 inode->i_mapping->a_ops = &xfs_address_space_operations;
1271 break;
1272 case S_IFDIR:
1273 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1274 inode->i_op = &xfs_dir_ci_inode_operations;
1275 else
1276 inode->i_op = &xfs_dir_inode_operations;
1277 inode->i_fop = &xfs_dir_file_operations;
1278 break;
1279 case S_IFLNK:
1280 if (ip->i_df.if_flags & XFS_IFINLINE)
1281 inode->i_op = &xfs_inline_symlink_inode_operations;
1282 else
1283 inode->i_op = &xfs_symlink_inode_operations;
1284 break;
1285 default:
1286 inode->i_op = &xfs_inode_operations;
1287 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1288 break;
1289 }
1290}