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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_sb.h"
25#include "xfs_ag.h"
26#include "xfs_mount.h"
27#include "xfs_da_format.h"
28#include "xfs_inode.h"
29#include "xfs_bmap.h"
30#include "xfs_bmap_util.h"
31#include "xfs_acl.h"
32#include "xfs_quota.h"
33#include "xfs_error.h"
34#include "xfs_attr.h"
35#include "xfs_trans.h"
36#include "xfs_trace.h"
37#include "xfs_icache.h"
38#include "xfs_symlink.h"
39#include "xfs_da_btree.h"
40#include "xfs_dir2_priv.h"
41#include "xfs_dinode.h"
42#include "xfs_trans_space.h"
43
44#include <linux/capability.h>
45#include <linux/xattr.h>
46#include <linux/namei.h>
47#include <linux/posix_acl.h>
48#include <linux/security.h>
49#include <linux/fiemap.h>
50#include <linux/slab.h>
51
52/*
53 * Directories have different lock order w.r.t. mmap_sem compared to regular
54 * files. This is due to readdir potentially triggering page faults on a user
55 * buffer inside filldir(), and this happens with the ilock on the directory
56 * held. For regular files, the lock order is the other way around - the
57 * mmap_sem is taken during the page fault, and then we lock the ilock to do
58 * block mapping. Hence we need a different class for the directory ilock so
59 * that lockdep can tell them apart.
60 */
61static struct lock_class_key xfs_nondir_ilock_class;
62static struct lock_class_key xfs_dir_ilock_class;
63
64static int
65xfs_initxattrs(
66 struct inode *inode,
67 const struct xattr *xattr_array,
68 void *fs_info)
69{
70 const struct xattr *xattr;
71 struct xfs_inode *ip = XFS_I(inode);
72 int error = 0;
73
74 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
75 error = -xfs_attr_set(ip, xattr->name, xattr->value,
76 xattr->value_len, ATTR_SECURE);
77 if (error < 0)
78 break;
79 }
80 return error;
81}
82
83/*
84 * Hook in SELinux. This is not quite correct yet, what we really need
85 * here (as we do for default ACLs) is a mechanism by which creation of
86 * these attrs can be journalled at inode creation time (along with the
87 * inode, of course, such that log replay can't cause these to be lost).
88 */
89
90STATIC int
91xfs_init_security(
92 struct inode *inode,
93 struct inode *dir,
94 const struct qstr *qstr)
95{
96 return -security_inode_init_security(inode, dir, qstr,
97 &xfs_initxattrs, NULL);
98}
99
100static void
101xfs_dentry_to_name(
102 struct xfs_name *namep,
103 struct dentry *dentry,
104 int mode)
105{
106 namep->name = dentry->d_name.name;
107 namep->len = dentry->d_name.len;
108 namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT];
109}
110
111STATIC void
112xfs_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, 0);
125
126 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
127}
128
129STATIC int
130xfs_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 rdev = sysv_encode_dev(rdev);
151 } else {
152 rdev = 0;
153 }
154
155 error = posix_acl_create(dir, &mode, &default_acl, &acl);
156 if (error)
157 return error;
158
159 if (!tmpfile) {
160 xfs_dentry_to_name(&name, dentry, mode);
161 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
162 } else {
163 error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip);
164 }
165 if (unlikely(error))
166 goto out_free_acl;
167
168 inode = VFS_I(ip);
169
170 error = xfs_init_security(inode, dir, &dentry->d_name);
171 if (unlikely(error))
172 goto out_cleanup_inode;
173
174#ifdef CONFIG_XFS_POSIX_ACL
175 if (default_acl) {
176 error = -xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
177 if (error)
178 goto out_cleanup_inode;
179 }
180 if (acl) {
181 error = -xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
182 if (error)
183 goto out_cleanup_inode;
184 }
185#endif
186
187 if (tmpfile)
188 d_tmpfile(dentry, inode);
189 else
190 d_instantiate(dentry, inode);
191
192 out_free_acl:
193 if (default_acl)
194 posix_acl_release(default_acl);
195 if (acl)
196 posix_acl_release(acl);
197 return -error;
198
199 out_cleanup_inode:
200 if (!tmpfile)
201 xfs_cleanup_inode(dir, inode, dentry);
202 iput(inode);
203 goto out_free_acl;
204}
205
206STATIC int
207xfs_vn_mknod(
208 struct inode *dir,
209 struct dentry *dentry,
210 umode_t mode,
211 dev_t rdev)
212{
213 return xfs_generic_create(dir, dentry, mode, rdev, false);
214}
215
216STATIC int
217xfs_vn_create(
218 struct inode *dir,
219 struct dentry *dentry,
220 umode_t mode,
221 bool flags)
222{
223 return xfs_vn_mknod(dir, dentry, mode, 0);
224}
225
226STATIC int
227xfs_vn_mkdir(
228 struct inode *dir,
229 struct dentry *dentry,
230 umode_t mode)
231{
232 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
233}
234
235STATIC struct dentry *
236xfs_vn_lookup(
237 struct inode *dir,
238 struct dentry *dentry,
239 unsigned int flags)
240{
241 struct xfs_inode *cip;
242 struct xfs_name name;
243 int error;
244
245 if (dentry->d_name.len >= MAXNAMELEN)
246 return ERR_PTR(-ENAMETOOLONG);
247
248 xfs_dentry_to_name(&name, dentry, 0);
249 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
250 if (unlikely(error)) {
251 if (unlikely(error != ENOENT))
252 return ERR_PTR(-error);
253 d_add(dentry, NULL);
254 return NULL;
255 }
256
257 return d_splice_alias(VFS_I(cip), dentry);
258}
259
260STATIC struct dentry *
261xfs_vn_ci_lookup(
262 struct inode *dir,
263 struct dentry *dentry,
264 unsigned int flags)
265{
266 struct xfs_inode *ip;
267 struct xfs_name xname;
268 struct xfs_name ci_name;
269 struct qstr dname;
270 int error;
271
272 if (dentry->d_name.len >= MAXNAMELEN)
273 return ERR_PTR(-ENAMETOOLONG);
274
275 xfs_dentry_to_name(&xname, dentry, 0);
276 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
277 if (unlikely(error)) {
278 if (unlikely(error != ENOENT))
279 return ERR_PTR(-error);
280 /*
281 * call d_add(dentry, NULL) here when d_drop_negative_children
282 * is called in xfs_vn_mknod (ie. allow negative dentries
283 * with CI filesystems).
284 */
285 return NULL;
286 }
287
288 /* if exact match, just splice and exit */
289 if (!ci_name.name)
290 return d_splice_alias(VFS_I(ip), dentry);
291
292 /* else case-insensitive match... */
293 dname.name = ci_name.name;
294 dname.len = ci_name.len;
295 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
296 kmem_free(ci_name.name);
297 return dentry;
298}
299
300STATIC int
301xfs_vn_link(
302 struct dentry *old_dentry,
303 struct inode *dir,
304 struct dentry *dentry)
305{
306 struct inode *inode = old_dentry->d_inode;
307 struct xfs_name name;
308 int error;
309
310 xfs_dentry_to_name(&name, dentry, inode->i_mode);
311
312 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
313 if (unlikely(error))
314 return -error;
315
316 ihold(inode);
317 d_instantiate(dentry, inode);
318 return 0;
319}
320
321STATIC int
322xfs_vn_unlink(
323 struct inode *dir,
324 struct dentry *dentry)
325{
326 struct xfs_name name;
327 int error;
328
329 xfs_dentry_to_name(&name, dentry, 0);
330
331 error = -xfs_remove(XFS_I(dir), &name, XFS_I(dentry->d_inode));
332 if (error)
333 return error;
334
335 /*
336 * With unlink, the VFS makes the dentry "negative": no inode,
337 * but still hashed. This is incompatible with case-insensitive
338 * mode, so invalidate (unhash) the dentry in CI-mode.
339 */
340 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
341 d_invalidate(dentry);
342 return 0;
343}
344
345STATIC int
346xfs_vn_symlink(
347 struct inode *dir,
348 struct dentry *dentry,
349 const char *symname)
350{
351 struct inode *inode;
352 struct xfs_inode *cip = NULL;
353 struct xfs_name name;
354 int error;
355 umode_t mode;
356
357 mode = S_IFLNK |
358 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
359 xfs_dentry_to_name(&name, dentry, mode);
360
361 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
362 if (unlikely(error))
363 goto out;
364
365 inode = VFS_I(cip);
366
367 error = xfs_init_security(inode, dir, &dentry->d_name);
368 if (unlikely(error))
369 goto out_cleanup_inode;
370
371 d_instantiate(dentry, inode);
372 return 0;
373
374 out_cleanup_inode:
375 xfs_cleanup_inode(dir, inode, dentry);
376 iput(inode);
377 out:
378 return -error;
379}
380
381STATIC int
382xfs_vn_rename(
383 struct inode *odir,
384 struct dentry *odentry,
385 struct inode *ndir,
386 struct dentry *ndentry)
387{
388 struct inode *new_inode = ndentry->d_inode;
389 struct xfs_name oname;
390 struct xfs_name nname;
391
392 xfs_dentry_to_name(&oname, odentry, 0);
393 xfs_dentry_to_name(&nname, ndentry, odentry->d_inode->i_mode);
394
395 return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode),
396 XFS_I(ndir), &nname, new_inode ?
397 XFS_I(new_inode) : NULL);
398}
399
400/*
401 * careful here - this function can get called recursively, so
402 * we need to be very careful about how much stack we use.
403 * uio is kmalloced for this reason...
404 */
405STATIC void *
406xfs_vn_follow_link(
407 struct dentry *dentry,
408 struct nameidata *nd)
409{
410 char *link;
411 int error = -ENOMEM;
412
413 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
414 if (!link)
415 goto out_err;
416
417 error = -xfs_readlink(XFS_I(dentry->d_inode), link);
418 if (unlikely(error))
419 goto out_kfree;
420
421 nd_set_link(nd, link);
422 return NULL;
423
424 out_kfree:
425 kfree(link);
426 out_err:
427 nd_set_link(nd, ERR_PTR(error));
428 return NULL;
429}
430
431STATIC int
432xfs_vn_getattr(
433 struct vfsmount *mnt,
434 struct dentry *dentry,
435 struct kstat *stat)
436{
437 struct inode *inode = dentry->d_inode;
438 struct xfs_inode *ip = XFS_I(inode);
439 struct xfs_mount *mp = ip->i_mount;
440
441 trace_xfs_getattr(ip);
442
443 if (XFS_FORCED_SHUTDOWN(mp))
444 return -XFS_ERROR(EIO);
445
446 stat->size = XFS_ISIZE(ip);
447 stat->dev = inode->i_sb->s_dev;
448 stat->mode = ip->i_d.di_mode;
449 stat->nlink = ip->i_d.di_nlink;
450 stat->uid = inode->i_uid;
451 stat->gid = inode->i_gid;
452 stat->ino = ip->i_ino;
453 stat->atime = inode->i_atime;
454 stat->mtime = inode->i_mtime;
455 stat->ctime = inode->i_ctime;
456 stat->blocks =
457 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
458
459
460 switch (inode->i_mode & S_IFMT) {
461 case S_IFBLK:
462 case S_IFCHR:
463 stat->blksize = BLKDEV_IOSIZE;
464 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
465 sysv_minor(ip->i_df.if_u2.if_rdev));
466 break;
467 default:
468 if (XFS_IS_REALTIME_INODE(ip)) {
469 /*
470 * If the file blocks are being allocated from a
471 * realtime volume, then return the inode's realtime
472 * extent size or the realtime volume's extent size.
473 */
474 stat->blksize =
475 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
476 } else
477 stat->blksize = xfs_preferred_iosize(mp);
478 stat->rdev = 0;
479 break;
480 }
481
482 return 0;
483}
484
485static void
486xfs_setattr_mode(
487 struct xfs_inode *ip,
488 struct iattr *iattr)
489{
490 struct inode *inode = VFS_I(ip);
491 umode_t mode = iattr->ia_mode;
492
493 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
494
495 ip->i_d.di_mode &= S_IFMT;
496 ip->i_d.di_mode |= mode & ~S_IFMT;
497
498 inode->i_mode &= S_IFMT;
499 inode->i_mode |= mode & ~S_IFMT;
500}
501
502static void
503xfs_setattr_time(
504 struct xfs_inode *ip,
505 struct iattr *iattr)
506{
507 struct inode *inode = VFS_I(ip);
508
509 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
510
511 if (iattr->ia_valid & ATTR_ATIME) {
512 inode->i_atime = iattr->ia_atime;
513 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
514 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
515 }
516 if (iattr->ia_valid & ATTR_CTIME) {
517 inode->i_ctime = iattr->ia_ctime;
518 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
519 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
520 }
521 if (iattr->ia_valid & ATTR_MTIME) {
522 inode->i_mtime = iattr->ia_mtime;
523 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
524 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
525 }
526}
527
528int
529xfs_setattr_nonsize(
530 struct xfs_inode *ip,
531 struct iattr *iattr,
532 int flags)
533{
534 xfs_mount_t *mp = ip->i_mount;
535 struct inode *inode = VFS_I(ip);
536 int mask = iattr->ia_valid;
537 xfs_trans_t *tp;
538 int error;
539 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
540 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
541 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
542 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
543
544 trace_xfs_setattr(ip);
545
546 /* If acls are being inherited, we already have this checked */
547 if (!(flags & XFS_ATTR_NOACL)) {
548 if (mp->m_flags & XFS_MOUNT_RDONLY)
549 return XFS_ERROR(EROFS);
550
551 if (XFS_FORCED_SHUTDOWN(mp))
552 return XFS_ERROR(EIO);
553
554 error = -inode_change_ok(inode, iattr);
555 if (error)
556 return XFS_ERROR(error);
557 }
558
559 ASSERT((mask & ATTR_SIZE) == 0);
560
561 /*
562 * If disk quotas is on, we make sure that the dquots do exist on disk,
563 * before we start any other transactions. Trying to do this later
564 * is messy. We don't care to take a readlock to look at the ids
565 * in inode here, because we can't hold it across the trans_reserve.
566 * If the IDs do change before we take the ilock, we're covered
567 * because the i_*dquot fields will get updated anyway.
568 */
569 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
570 uint qflags = 0;
571
572 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
573 uid = iattr->ia_uid;
574 qflags |= XFS_QMOPT_UQUOTA;
575 } else {
576 uid = inode->i_uid;
577 }
578 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
579 gid = iattr->ia_gid;
580 qflags |= XFS_QMOPT_GQUOTA;
581 } else {
582 gid = inode->i_gid;
583 }
584
585 /*
586 * We take a reference when we initialize udqp and gdqp,
587 * so it is important that we never blindly double trip on
588 * the same variable. See xfs_create() for an example.
589 */
590 ASSERT(udqp == NULL);
591 ASSERT(gdqp == NULL);
592 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
593 xfs_kgid_to_gid(gid),
594 xfs_get_projid(ip),
595 qflags, &udqp, &gdqp, NULL);
596 if (error)
597 return error;
598 }
599
600 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
601 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
602 if (error)
603 goto out_dqrele;
604
605 xfs_ilock(ip, XFS_ILOCK_EXCL);
606
607 /*
608 * Change file ownership. Must be the owner or privileged.
609 */
610 if (mask & (ATTR_UID|ATTR_GID)) {
611 /*
612 * These IDs could have changed since we last looked at them.
613 * But, we're assured that if the ownership did change
614 * while we didn't have the inode locked, inode's dquot(s)
615 * would have changed also.
616 */
617 iuid = inode->i_uid;
618 igid = inode->i_gid;
619 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
620 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
621
622 /*
623 * Do a quota reservation only if uid/gid is actually
624 * going to change.
625 */
626 if (XFS_IS_QUOTA_RUNNING(mp) &&
627 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
628 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
629 ASSERT(tp);
630 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
631 NULL, capable(CAP_FOWNER) ?
632 XFS_QMOPT_FORCE_RES : 0);
633 if (error) /* out of quota */
634 goto out_trans_cancel;
635 }
636 }
637
638 xfs_trans_ijoin(tp, ip, 0);
639
640 /*
641 * Change file ownership. Must be the owner or privileged.
642 */
643 if (mask & (ATTR_UID|ATTR_GID)) {
644 /*
645 * CAP_FSETID overrides the following restrictions:
646 *
647 * The set-user-ID and set-group-ID bits of a file will be
648 * cleared upon successful return from chown()
649 */
650 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
651 !capable(CAP_FSETID))
652 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
653
654 /*
655 * Change the ownerships and register quota modifications
656 * in the transaction.
657 */
658 if (!uid_eq(iuid, uid)) {
659 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
660 ASSERT(mask & ATTR_UID);
661 ASSERT(udqp);
662 olddquot1 = xfs_qm_vop_chown(tp, ip,
663 &ip->i_udquot, udqp);
664 }
665 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
666 inode->i_uid = uid;
667 }
668 if (!gid_eq(igid, gid)) {
669 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
670 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
671 !XFS_IS_PQUOTA_ON(mp));
672 ASSERT(mask & ATTR_GID);
673 ASSERT(gdqp);
674 olddquot2 = xfs_qm_vop_chown(tp, ip,
675 &ip->i_gdquot, gdqp);
676 }
677 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
678 inode->i_gid = gid;
679 }
680 }
681
682 if (mask & ATTR_MODE)
683 xfs_setattr_mode(ip, iattr);
684 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
685 xfs_setattr_time(ip, iattr);
686
687 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
688
689 XFS_STATS_INC(xs_ig_attrchg);
690
691 if (mp->m_flags & XFS_MOUNT_WSYNC)
692 xfs_trans_set_sync(tp);
693 error = xfs_trans_commit(tp, 0);
694
695 xfs_iunlock(ip, XFS_ILOCK_EXCL);
696
697 /*
698 * Release any dquot(s) the inode had kept before chown.
699 */
700 xfs_qm_dqrele(olddquot1);
701 xfs_qm_dqrele(olddquot2);
702 xfs_qm_dqrele(udqp);
703 xfs_qm_dqrele(gdqp);
704
705 if (error)
706 return XFS_ERROR(error);
707
708 /*
709 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
710 * update. We could avoid this with linked transactions
711 * and passing down the transaction pointer all the way
712 * to attr_set. No previous user of the generic
713 * Posix ACL code seems to care about this issue either.
714 */
715 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
716 error = -posix_acl_chmod(inode, inode->i_mode);
717 if (error)
718 return XFS_ERROR(error);
719 }
720
721 return 0;
722
723out_trans_cancel:
724 xfs_trans_cancel(tp, 0);
725 xfs_iunlock(ip, XFS_ILOCK_EXCL);
726out_dqrele:
727 xfs_qm_dqrele(udqp);
728 xfs_qm_dqrele(gdqp);
729 return error;
730}
731
732/*
733 * Truncate file. Must have write permission and not be a directory.
734 */
735int
736xfs_setattr_size(
737 struct xfs_inode *ip,
738 struct iattr *iattr)
739{
740 struct xfs_mount *mp = ip->i_mount;
741 struct inode *inode = VFS_I(ip);
742 xfs_off_t oldsize, newsize;
743 struct xfs_trans *tp;
744 int error;
745 uint lock_flags = 0;
746 uint commit_flags = 0;
747
748 trace_xfs_setattr(ip);
749
750 if (mp->m_flags & XFS_MOUNT_RDONLY)
751 return XFS_ERROR(EROFS);
752
753 if (XFS_FORCED_SHUTDOWN(mp))
754 return XFS_ERROR(EIO);
755
756 error = -inode_change_ok(inode, iattr);
757 if (error)
758 return XFS_ERROR(error);
759
760 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
761 ASSERT(S_ISREG(ip->i_d.di_mode));
762 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
763 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
764
765 oldsize = inode->i_size;
766 newsize = iattr->ia_size;
767
768 /*
769 * Short circuit the truncate case for zero length files.
770 */
771 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
772 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
773 return 0;
774
775 /*
776 * Use the regular setattr path to update the timestamps.
777 */
778 iattr->ia_valid &= ~ATTR_SIZE;
779 return xfs_setattr_nonsize(ip, iattr, 0);
780 }
781
782 /*
783 * Make sure that the dquots are attached to the inode.
784 */
785 error = xfs_qm_dqattach(ip, 0);
786 if (error)
787 return error;
788
789 /*
790 * Now we can make the changes. Before we join the inode to the
791 * transaction, take care of the part of the truncation that must be
792 * done without the inode lock. This needs to be done before joining
793 * the inode to the transaction, because the inode cannot be unlocked
794 * once it is a part of the transaction.
795 */
796 if (newsize > oldsize) {
797 /*
798 * Do the first part of growing a file: zero any data in the
799 * last block that is beyond the old EOF. We need to do this
800 * before the inode is joined to the transaction to modify
801 * i_size.
802 */
803 error = xfs_zero_eof(ip, newsize, oldsize);
804 if (error)
805 return error;
806 }
807
808 /*
809 * We are going to log the inode size change in this transaction so
810 * any previous writes that are beyond the on disk EOF and the new
811 * EOF that have not been written out need to be written here. If we
812 * do not write the data out, we expose ourselves to the null files
813 * problem.
814 *
815 * Only flush from the on disk size to the smaller of the in memory
816 * file size or the new size as that's the range we really care about
817 * here and prevents waiting for other data not within the range we
818 * care about here.
819 */
820 if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) {
821 error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
822 ip->i_d.di_size, newsize);
823 if (error)
824 return error;
825 }
826
827 /*
828 * Wait for all direct I/O to complete.
829 */
830 inode_dio_wait(inode);
831
832 error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
833 if (error)
834 return error;
835
836 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
837 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
838 if (error)
839 goto out_trans_cancel;
840
841 truncate_setsize(inode, newsize);
842
843 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
844 lock_flags |= XFS_ILOCK_EXCL;
845
846 xfs_ilock(ip, XFS_ILOCK_EXCL);
847
848 xfs_trans_ijoin(tp, ip, 0);
849
850 /*
851 * Only change the c/mtime if we are changing the size or we are
852 * explicitly asked to change it. This handles the semantic difference
853 * between truncate() and ftruncate() as implemented in the VFS.
854 *
855 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
856 * special case where we need to update the times despite not having
857 * these flags set. For all other operations the VFS set these flags
858 * explicitly if it wants a timestamp update.
859 */
860 if (newsize != oldsize &&
861 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
862 iattr->ia_ctime = iattr->ia_mtime =
863 current_fs_time(inode->i_sb);
864 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
865 }
866
867 /*
868 * The first thing we do is set the size to new_size permanently on
869 * disk. This way we don't have to worry about anyone ever being able
870 * to look at the data being freed even in the face of a crash.
871 * What we're getting around here is the case where we free a block, it
872 * is allocated to another file, it is written to, and then we crash.
873 * If the new data gets written to the file but the log buffers
874 * containing the free and reallocation don't, then we'd end up with
875 * garbage in the blocks being freed. As long as we make the new size
876 * permanent before actually freeing any blocks it doesn't matter if
877 * they get written to.
878 */
879 ip->i_d.di_size = newsize;
880 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
881
882 if (newsize <= oldsize) {
883 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
884 if (error)
885 goto out_trans_abort;
886
887 /*
888 * Truncated "down", so we're removing references to old data
889 * here - if we delay flushing for a long time, we expose
890 * ourselves unduly to the notorious NULL files problem. So,
891 * we mark this inode and flush it when the file is closed,
892 * and do not wait the usual (long) time for writeout.
893 */
894 xfs_iflags_set(ip, XFS_ITRUNCATED);
895
896 /* A truncate down always removes post-EOF blocks. */
897 xfs_inode_clear_eofblocks_tag(ip);
898 }
899
900 if (iattr->ia_valid & ATTR_MODE)
901 xfs_setattr_mode(ip, iattr);
902 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
903 xfs_setattr_time(ip, iattr);
904
905 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
906
907 XFS_STATS_INC(xs_ig_attrchg);
908
909 if (mp->m_flags & XFS_MOUNT_WSYNC)
910 xfs_trans_set_sync(tp);
911
912 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
913out_unlock:
914 if (lock_flags)
915 xfs_iunlock(ip, lock_flags);
916 return error;
917
918out_trans_abort:
919 commit_flags |= XFS_TRANS_ABORT;
920out_trans_cancel:
921 xfs_trans_cancel(tp, commit_flags);
922 goto out_unlock;
923}
924
925STATIC int
926xfs_vn_setattr(
927 struct dentry *dentry,
928 struct iattr *iattr)
929{
930 struct xfs_inode *ip = XFS_I(dentry->d_inode);
931 int error;
932
933 if (iattr->ia_valid & ATTR_SIZE) {
934 xfs_ilock(ip, XFS_IOLOCK_EXCL);
935 error = xfs_setattr_size(ip, iattr);
936 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
937 } else {
938 error = xfs_setattr_nonsize(ip, iattr, 0);
939 }
940
941 return -error;
942}
943
944STATIC int
945xfs_vn_update_time(
946 struct inode *inode,
947 struct timespec *now,
948 int flags)
949{
950 struct xfs_inode *ip = XFS_I(inode);
951 struct xfs_mount *mp = ip->i_mount;
952 struct xfs_trans *tp;
953 int error;
954
955 trace_xfs_update_time(ip);
956
957 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
958 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0);
959 if (error) {
960 xfs_trans_cancel(tp, 0);
961 return -error;
962 }
963
964 xfs_ilock(ip, XFS_ILOCK_EXCL);
965 if (flags & S_CTIME) {
966 inode->i_ctime = *now;
967 ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec;
968 ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec;
969 }
970 if (flags & S_MTIME) {
971 inode->i_mtime = *now;
972 ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec;
973 ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec;
974 }
975 if (flags & S_ATIME) {
976 inode->i_atime = *now;
977 ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec;
978 ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec;
979 }
980 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
981 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
982 return -xfs_trans_commit(tp, 0);
983}
984
985#define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
986
987/*
988 * Call fiemap helper to fill in user data.
989 * Returns positive errors to xfs_getbmap.
990 */
991STATIC int
992xfs_fiemap_format(
993 void **arg,
994 struct getbmapx *bmv,
995 int *full)
996{
997 int error;
998 struct fiemap_extent_info *fieinfo = *arg;
999 u32 fiemap_flags = 0;
1000 u64 logical, physical, length;
1001
1002 /* Do nothing for a hole */
1003 if (bmv->bmv_block == -1LL)
1004 return 0;
1005
1006 logical = BBTOB(bmv->bmv_offset);
1007 physical = BBTOB(bmv->bmv_block);
1008 length = BBTOB(bmv->bmv_length);
1009
1010 if (bmv->bmv_oflags & BMV_OF_PREALLOC)
1011 fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
1012 else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
1013 fiemap_flags |= (FIEMAP_EXTENT_DELALLOC |
1014 FIEMAP_EXTENT_UNKNOWN);
1015 physical = 0; /* no block yet */
1016 }
1017 if (bmv->bmv_oflags & BMV_OF_LAST)
1018 fiemap_flags |= FIEMAP_EXTENT_LAST;
1019
1020 error = fiemap_fill_next_extent(fieinfo, logical, physical,
1021 length, fiemap_flags);
1022 if (error > 0) {
1023 error = 0;
1024 *full = 1; /* user array now full */
1025 }
1026
1027 return -error;
1028}
1029
1030STATIC int
1031xfs_vn_fiemap(
1032 struct inode *inode,
1033 struct fiemap_extent_info *fieinfo,
1034 u64 start,
1035 u64 length)
1036{
1037 xfs_inode_t *ip = XFS_I(inode);
1038 struct getbmapx bm;
1039 int error;
1040
1041 error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
1042 if (error)
1043 return error;
1044
1045 /* Set up bmap header for xfs internal routine */
1046 bm.bmv_offset = BTOBB(start);
1047 /* Special case for whole file */
1048 if (length == FIEMAP_MAX_OFFSET)
1049 bm.bmv_length = -1LL;
1050 else
1051 bm.bmv_length = BTOBB(length);
1052
1053 /* We add one because in getbmap world count includes the header */
1054 bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
1055 fieinfo->fi_extents_max + 1;
1056 bm.bmv_count = min_t(__s32, bm.bmv_count,
1057 (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
1058 bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
1059 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
1060 bm.bmv_iflags |= BMV_IF_ATTRFORK;
1061 if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
1062 bm.bmv_iflags |= BMV_IF_DELALLOC;
1063
1064 error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
1065 if (error)
1066 return -error;
1067
1068 return 0;
1069}
1070
1071STATIC int
1072xfs_vn_tmpfile(
1073 struct inode *dir,
1074 struct dentry *dentry,
1075 umode_t mode)
1076{
1077 return xfs_generic_create(dir, dentry, mode, 0, true);
1078}
1079
1080static const struct inode_operations xfs_inode_operations = {
1081 .get_acl = xfs_get_acl,
1082 .set_acl = xfs_set_acl,
1083 .getattr = xfs_vn_getattr,
1084 .setattr = xfs_vn_setattr,
1085 .setxattr = generic_setxattr,
1086 .getxattr = generic_getxattr,
1087 .removexattr = generic_removexattr,
1088 .listxattr = xfs_vn_listxattr,
1089 .fiemap = xfs_vn_fiemap,
1090 .update_time = xfs_vn_update_time,
1091};
1092
1093static const struct inode_operations xfs_dir_inode_operations = {
1094 .create = xfs_vn_create,
1095 .lookup = xfs_vn_lookup,
1096 .link = xfs_vn_link,
1097 .unlink = xfs_vn_unlink,
1098 .symlink = xfs_vn_symlink,
1099 .mkdir = xfs_vn_mkdir,
1100 /*
1101 * Yes, XFS uses the same method for rmdir and unlink.
1102 *
1103 * There are some subtile differences deeper in the code,
1104 * but we use S_ISDIR to check for those.
1105 */
1106 .rmdir = xfs_vn_unlink,
1107 .mknod = xfs_vn_mknod,
1108 .rename = xfs_vn_rename,
1109 .get_acl = xfs_get_acl,
1110 .set_acl = xfs_set_acl,
1111 .getattr = xfs_vn_getattr,
1112 .setattr = xfs_vn_setattr,
1113 .setxattr = generic_setxattr,
1114 .getxattr = generic_getxattr,
1115 .removexattr = generic_removexattr,
1116 .listxattr = xfs_vn_listxattr,
1117 .update_time = xfs_vn_update_time,
1118 .tmpfile = xfs_vn_tmpfile,
1119};
1120
1121static const struct inode_operations xfs_dir_ci_inode_operations = {
1122 .create = xfs_vn_create,
1123 .lookup = xfs_vn_ci_lookup,
1124 .link = xfs_vn_link,
1125 .unlink = xfs_vn_unlink,
1126 .symlink = xfs_vn_symlink,
1127 .mkdir = xfs_vn_mkdir,
1128 /*
1129 * Yes, XFS uses the same method for rmdir and unlink.
1130 *
1131 * There are some subtile differences deeper in the code,
1132 * but we use S_ISDIR to check for those.
1133 */
1134 .rmdir = xfs_vn_unlink,
1135 .mknod = xfs_vn_mknod,
1136 .rename = xfs_vn_rename,
1137 .get_acl = xfs_get_acl,
1138 .set_acl = xfs_set_acl,
1139 .getattr = xfs_vn_getattr,
1140 .setattr = xfs_vn_setattr,
1141 .setxattr = generic_setxattr,
1142 .getxattr = generic_getxattr,
1143 .removexattr = generic_removexattr,
1144 .listxattr = xfs_vn_listxattr,
1145 .update_time = xfs_vn_update_time,
1146 .tmpfile = xfs_vn_tmpfile,
1147};
1148
1149static const struct inode_operations xfs_symlink_inode_operations = {
1150 .readlink = generic_readlink,
1151 .follow_link = xfs_vn_follow_link,
1152 .put_link = kfree_put_link,
1153 .getattr = xfs_vn_getattr,
1154 .setattr = xfs_vn_setattr,
1155 .setxattr = generic_setxattr,
1156 .getxattr = generic_getxattr,
1157 .removexattr = generic_removexattr,
1158 .listxattr = xfs_vn_listxattr,
1159 .update_time = xfs_vn_update_time,
1160};
1161
1162STATIC void
1163xfs_diflags_to_iflags(
1164 struct inode *inode,
1165 struct xfs_inode *ip)
1166{
1167 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
1168 inode->i_flags |= S_IMMUTABLE;
1169 else
1170 inode->i_flags &= ~S_IMMUTABLE;
1171 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
1172 inode->i_flags |= S_APPEND;
1173 else
1174 inode->i_flags &= ~S_APPEND;
1175 if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
1176 inode->i_flags |= S_SYNC;
1177 else
1178 inode->i_flags &= ~S_SYNC;
1179 if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
1180 inode->i_flags |= S_NOATIME;
1181 else
1182 inode->i_flags &= ~S_NOATIME;
1183}
1184
1185/*
1186 * Initialize the Linux inode, set up the operation vectors and
1187 * unlock the inode.
1188 *
1189 * When reading existing inodes from disk this is called directly
1190 * from xfs_iget, when creating a new inode it is called from
1191 * xfs_ialloc after setting up the inode.
1192 *
1193 * We are always called with an uninitialised linux inode here.
1194 * We need to initialise the necessary fields and take a reference
1195 * on it.
1196 */
1197void
1198xfs_setup_inode(
1199 struct xfs_inode *ip)
1200{
1201 struct inode *inode = &ip->i_vnode;
1202 gfp_t gfp_mask;
1203
1204 inode->i_ino = ip->i_ino;
1205 inode->i_state = I_NEW;
1206
1207 inode_sb_list_add(inode);
1208 /* make the inode look hashed for the writeback code */
1209 hlist_add_fake(&inode->i_hash);
1210
1211 inode->i_mode = ip->i_d.di_mode;
1212 set_nlink(inode, ip->i_d.di_nlink);
1213 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1214 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1215
1216 switch (inode->i_mode & S_IFMT) {
1217 case S_IFBLK:
1218 case S_IFCHR:
1219 inode->i_rdev =
1220 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
1221 sysv_minor(ip->i_df.if_u2.if_rdev));
1222 break;
1223 default:
1224 inode->i_rdev = 0;
1225 break;
1226 }
1227
1228 inode->i_generation = ip->i_d.di_gen;
1229 i_size_write(inode, ip->i_d.di_size);
1230 inode->i_atime.tv_sec = ip->i_d.di_atime.t_sec;
1231 inode->i_atime.tv_nsec = ip->i_d.di_atime.t_nsec;
1232 inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
1233 inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
1234 inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
1235 inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
1236 xfs_diflags_to_iflags(inode, ip);
1237
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 switch (inode->i_mode & S_IFMT) {
1241 case S_IFREG:
1242 inode->i_op = &xfs_inode_operations;
1243 inode->i_fop = &xfs_file_operations;
1244 inode->i_mapping->a_ops = &xfs_address_space_operations;
1245 break;
1246 case S_IFDIR:
1247 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1248 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1249 inode->i_op = &xfs_dir_ci_inode_operations;
1250 else
1251 inode->i_op = &xfs_dir_inode_operations;
1252 inode->i_fop = &xfs_dir_file_operations;
1253 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1254 break;
1255 case S_IFLNK:
1256 inode->i_op = &xfs_symlink_inode_operations;
1257 if (!(ip->i_df.if_flags & XFS_IFINLINE))
1258 inode->i_mapping->a_ops = &xfs_address_space_operations;
1259 break;
1260 default:
1261 inode->i_op = &xfs_inode_operations;
1262 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1263 break;
1264 }
1265
1266 /*
1267 * Ensure all page cache allocations are done from GFP_NOFS context to
1268 * prevent direct reclaim recursion back into the filesystem and blowing
1269 * stacks or deadlocking.
1270 */
1271 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1272 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1273
1274 /*
1275 * If there is no attribute fork no ACL can exist on this inode,
1276 * and it can't have any file capabilities attached to it either.
1277 */
1278 if (!XFS_IFORK_Q(ip)) {
1279 inode_has_no_xattr(inode);
1280 cache_no_acl(inode);
1281 }
1282
1283 xfs_iflags_clear(ip, XFS_INEW);
1284 barrier();
1285
1286 unlock_new_inode(inode);
1287}
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 */
39static struct lock_class_key xfs_nondir_ilock_class;
40static struct lock_class_key xfs_dir_ilock_class;
41
42static int
43xfs_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
75STATIC int
76xfs_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
85static void
86xfs_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
95static int
96xfs_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
111STATIC void
112xfs_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
129STATIC int
130xfs_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
223STATIC int
224xfs_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
233STATIC int
234xfs_vn_create(
235 struct inode *dir,
236 struct dentry *dentry,
237 umode_t mode,
238 bool flags)
239{
240 return xfs_vn_mknod(dir, dentry, mode, 0);
241}
242
243STATIC int
244xfs_vn_mkdir(
245 struct inode *dir,
246 struct dentry *dentry,
247 umode_t mode)
248{
249 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
250}
251
252STATIC struct dentry *
253xfs_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
277STATIC struct dentry *
278xfs_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
317STATIC int
318xfs_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
340STATIC int
341xfs_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
364STATIC int
365xfs_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
406STATIC int
407xfs_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 */
446STATIC const char *
447xfs_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
475STATIC const char *
476xfs_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
496static uint32_t
497xfs_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
532STATIC int
533xfs_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
598static void
599xfs_setattr_mode(
600 struct xfs_inode *ip,
601 struct iattr *iattr)
602{
603 struct inode *inode = VFS_I(ip);
604 umode_t mode = iattr->ia_mode;
605
606 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
607
608 inode->i_mode &= S_IFMT;
609 inode->i_mode |= mode & ~S_IFMT;
610}
611
612void
613xfs_setattr_time(
614 struct xfs_inode *ip,
615 struct iattr *iattr)
616{
617 struct inode *inode = VFS_I(ip);
618
619 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
620
621 if (iattr->ia_valid & ATTR_ATIME)
622 inode->i_atime = iattr->ia_atime;
623 if (iattr->ia_valid & ATTR_CTIME)
624 inode->i_ctime = iattr->ia_ctime;
625 if (iattr->ia_valid & ATTR_MTIME)
626 inode->i_mtime = iattr->ia_mtime;
627}
628
629static int
630xfs_vn_change_ok(
631 struct dentry *dentry,
632 struct iattr *iattr)
633{
634 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
635
636 if (mp->m_flags & XFS_MOUNT_RDONLY)
637 return -EROFS;
638
639 if (XFS_FORCED_SHUTDOWN(mp))
640 return -EIO;
641
642 return setattr_prepare(dentry, iattr);
643}
644
645/*
646 * Set non-size attributes of an inode.
647 *
648 * Caution: The caller of this function is responsible for calling
649 * setattr_prepare() or otherwise verifying the change is fine.
650 */
651int
652xfs_setattr_nonsize(
653 struct xfs_inode *ip,
654 struct iattr *iattr,
655 int flags)
656{
657 xfs_mount_t *mp = ip->i_mount;
658 struct inode *inode = VFS_I(ip);
659 int mask = iattr->ia_valid;
660 xfs_trans_t *tp;
661 int error;
662 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
663 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
664 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
665 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
666
667 ASSERT((mask & ATTR_SIZE) == 0);
668
669 /*
670 * If disk quotas is on, we make sure that the dquots do exist on disk,
671 * before we start any other transactions. Trying to do this later
672 * is messy. We don't care to take a readlock to look at the ids
673 * in inode here, because we can't hold it across the trans_reserve.
674 * If the IDs do change before we take the ilock, we're covered
675 * because the i_*dquot fields will get updated anyway.
676 */
677 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
678 uint qflags = 0;
679
680 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
681 uid = iattr->ia_uid;
682 qflags |= XFS_QMOPT_UQUOTA;
683 } else {
684 uid = inode->i_uid;
685 }
686 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
687 gid = iattr->ia_gid;
688 qflags |= XFS_QMOPT_GQUOTA;
689 } else {
690 gid = inode->i_gid;
691 }
692
693 /*
694 * We take a reference when we initialize udqp and gdqp,
695 * so it is important that we never blindly double trip on
696 * the same variable. See xfs_create() for an example.
697 */
698 ASSERT(udqp == NULL);
699 ASSERT(gdqp == NULL);
700 error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_d.di_projid,
701 qflags, &udqp, &gdqp, NULL);
702 if (error)
703 return error;
704 }
705
706 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
707 if (error)
708 goto out_dqrele;
709
710 xfs_ilock(ip, XFS_ILOCK_EXCL);
711 xfs_trans_ijoin(tp, ip, 0);
712
713 /*
714 * Change file ownership. Must be the owner or privileged.
715 */
716 if (mask & (ATTR_UID|ATTR_GID)) {
717 /*
718 * These IDs could have changed since we last looked at them.
719 * But, we're assured that if the ownership did change
720 * while we didn't have the inode locked, inode's dquot(s)
721 * would have changed also.
722 */
723 iuid = inode->i_uid;
724 igid = inode->i_gid;
725 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
726 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
727
728 /*
729 * Do a quota reservation only if uid/gid is actually
730 * going to change.
731 */
732 if (XFS_IS_QUOTA_RUNNING(mp) &&
733 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
734 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
735 ASSERT(tp);
736 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
737 NULL, capable(CAP_FOWNER) ?
738 XFS_QMOPT_FORCE_RES : 0);
739 if (error) /* out of quota */
740 goto out_cancel;
741 }
742
743 /*
744 * CAP_FSETID overrides the following restrictions:
745 *
746 * The set-user-ID and set-group-ID bits of a file will be
747 * cleared upon successful return from chown()
748 */
749 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
750 !capable(CAP_FSETID))
751 inode->i_mode &= ~(S_ISUID|S_ISGID);
752
753 /*
754 * Change the ownerships and register quota modifications
755 * in the transaction.
756 */
757 if (!uid_eq(iuid, uid)) {
758 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
759 ASSERT(mask & ATTR_UID);
760 ASSERT(udqp);
761 olddquot1 = xfs_qm_vop_chown(tp, ip,
762 &ip->i_udquot, udqp);
763 }
764 inode->i_uid = uid;
765 }
766 if (!gid_eq(igid, gid)) {
767 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
768 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
769 !XFS_IS_PQUOTA_ON(mp));
770 ASSERT(mask & ATTR_GID);
771 ASSERT(gdqp);
772 olddquot2 = xfs_qm_vop_chown(tp, ip,
773 &ip->i_gdquot, gdqp);
774 }
775 inode->i_gid = gid;
776 }
777 }
778
779 if (mask & ATTR_MODE)
780 xfs_setattr_mode(ip, iattr);
781 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
782 xfs_setattr_time(ip, iattr);
783
784 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
785
786 XFS_STATS_INC(mp, xs_ig_attrchg);
787
788 if (mp->m_flags & XFS_MOUNT_WSYNC)
789 xfs_trans_set_sync(tp);
790 error = xfs_trans_commit(tp);
791
792 xfs_iunlock(ip, XFS_ILOCK_EXCL);
793
794 /*
795 * Release any dquot(s) the inode had kept before chown.
796 */
797 xfs_qm_dqrele(olddquot1);
798 xfs_qm_dqrele(olddquot2);
799 xfs_qm_dqrele(udqp);
800 xfs_qm_dqrele(gdqp);
801
802 if (error)
803 return error;
804
805 /*
806 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
807 * update. We could avoid this with linked transactions
808 * and passing down the transaction pointer all the way
809 * to attr_set. No previous user of the generic
810 * Posix ACL code seems to care about this issue either.
811 */
812 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
813 error = posix_acl_chmod(inode, inode->i_mode);
814 if (error)
815 return error;
816 }
817
818 return 0;
819
820out_cancel:
821 xfs_trans_cancel(tp);
822 xfs_iunlock(ip, XFS_ILOCK_EXCL);
823out_dqrele:
824 xfs_qm_dqrele(udqp);
825 xfs_qm_dqrele(gdqp);
826 return error;
827}
828
829int
830xfs_vn_setattr_nonsize(
831 struct dentry *dentry,
832 struct iattr *iattr)
833{
834 struct xfs_inode *ip = XFS_I(d_inode(dentry));
835 int error;
836
837 trace_xfs_setattr(ip);
838
839 error = xfs_vn_change_ok(dentry, iattr);
840 if (error)
841 return error;
842 return xfs_setattr_nonsize(ip, iattr, 0);
843}
844
845/*
846 * Truncate file. Must have write permission and not be a directory.
847 *
848 * Caution: The caller of this function is responsible for calling
849 * setattr_prepare() or otherwise verifying the change is fine.
850 */
851STATIC int
852xfs_setattr_size(
853 struct xfs_inode *ip,
854 struct iattr *iattr)
855{
856 struct xfs_mount *mp = ip->i_mount;
857 struct inode *inode = VFS_I(ip);
858 xfs_off_t oldsize, newsize;
859 struct xfs_trans *tp;
860 int error;
861 uint lock_flags = 0;
862 bool did_zeroing = false;
863
864 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
865 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
866 ASSERT(S_ISREG(inode->i_mode));
867 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
868 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
869
870 oldsize = inode->i_size;
871 newsize = iattr->ia_size;
872
873 /*
874 * Short circuit the truncate case for zero length files.
875 */
876 if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
877 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
878 return 0;
879
880 /*
881 * Use the regular setattr path to update the timestamps.
882 */
883 iattr->ia_valid &= ~ATTR_SIZE;
884 return xfs_setattr_nonsize(ip, iattr, 0);
885 }
886
887 /*
888 * Make sure that the dquots are attached to the inode.
889 */
890 error = xfs_qm_dqattach(ip);
891 if (error)
892 return error;
893
894 /*
895 * Wait for all direct I/O to complete.
896 */
897 inode_dio_wait(inode);
898
899 /*
900 * File data changes must be complete before we start the transaction to
901 * modify the inode. This needs to be done before joining the inode to
902 * the transaction because the inode cannot be unlocked once it is a
903 * part of the transaction.
904 *
905 * Start with zeroing any data beyond EOF that we may expose on file
906 * extension, or zeroing out the rest of the block on a downward
907 * truncate.
908 */
909 if (newsize > oldsize) {
910 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
911 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
912 &did_zeroing, &xfs_buffered_write_iomap_ops);
913 } else {
914 error = iomap_truncate_page(inode, newsize, &did_zeroing,
915 &xfs_buffered_write_iomap_ops);
916 }
917
918 if (error)
919 return error;
920
921 /*
922 * We've already locked out new page faults, so now we can safely remove
923 * pages from the page cache knowing they won't get refaulted until we
924 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
925 * complete. The truncate_setsize() call also cleans partial EOF page
926 * PTEs on extending truncates and hence ensures sub-page block size
927 * filesystems are correctly handled, too.
928 *
929 * We have to do all the page cache truncate work outside the
930 * transaction context as the "lock" order is page lock->log space
931 * reservation as defined by extent allocation in the writeback path.
932 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
933 * having already truncated the in-memory version of the file (i.e. made
934 * user visible changes). There's not much we can do about this, except
935 * to hope that the caller sees ENOMEM and retries the truncate
936 * operation.
937 *
938 * And we update in-core i_size and truncate page cache beyond newsize
939 * before writeback the [di_size, newsize] range, so we're guaranteed
940 * not to write stale data past the new EOF on truncate down.
941 */
942 truncate_setsize(inode, newsize);
943
944 /*
945 * We are going to log the inode size change in this transaction so
946 * any previous writes that are beyond the on disk EOF and the new
947 * EOF that have not been written out need to be written here. If we
948 * do not write the data out, we expose ourselves to the null files
949 * problem. Note that this includes any block zeroing we did above;
950 * otherwise those blocks may not be zeroed after a crash.
951 */
952 if (did_zeroing ||
953 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
954 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
955 ip->i_d.di_size, newsize - 1);
956 if (error)
957 return error;
958 }
959
960 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
961 if (error)
962 return error;
963
964 lock_flags |= XFS_ILOCK_EXCL;
965 xfs_ilock(ip, XFS_ILOCK_EXCL);
966 xfs_trans_ijoin(tp, ip, 0);
967
968 /*
969 * Only change the c/mtime if we are changing the size or we are
970 * explicitly asked to change it. This handles the semantic difference
971 * between truncate() and ftruncate() as implemented in the VFS.
972 *
973 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
974 * special case where we need to update the times despite not having
975 * these flags set. For all other operations the VFS set these flags
976 * explicitly if it wants a timestamp update.
977 */
978 if (newsize != oldsize &&
979 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
980 iattr->ia_ctime = iattr->ia_mtime =
981 current_time(inode);
982 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
983 }
984
985 /*
986 * The first thing we do is set the size to new_size permanently on
987 * disk. This way we don't have to worry about anyone ever being able
988 * to look at the data being freed even in the face of a crash.
989 * What we're getting around here is the case where we free a block, it
990 * is allocated to another file, it is written to, and then we crash.
991 * If the new data gets written to the file but the log buffers
992 * containing the free and reallocation don't, then we'd end up with
993 * garbage in the blocks being freed. As long as we make the new size
994 * permanent before actually freeing any blocks it doesn't matter if
995 * they get written to.
996 */
997 ip->i_d.di_size = newsize;
998 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
999
1000 if (newsize <= oldsize) {
1001 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
1002 if (error)
1003 goto out_trans_cancel;
1004
1005 /*
1006 * Truncated "down", so we're removing references to old data
1007 * here - if we delay flushing for a long time, we expose
1008 * ourselves unduly to the notorious NULL files problem. So,
1009 * we mark this inode and flush it when the file is closed,
1010 * and do not wait the usual (long) time for writeout.
1011 */
1012 xfs_iflags_set(ip, XFS_ITRUNCATED);
1013
1014 /* A truncate down always removes post-EOF blocks. */
1015 xfs_inode_clear_eofblocks_tag(ip);
1016 }
1017
1018 if (iattr->ia_valid & ATTR_MODE)
1019 xfs_setattr_mode(ip, iattr);
1020 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
1021 xfs_setattr_time(ip, iattr);
1022
1023 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1024
1025 XFS_STATS_INC(mp, xs_ig_attrchg);
1026
1027 if (mp->m_flags & XFS_MOUNT_WSYNC)
1028 xfs_trans_set_sync(tp);
1029
1030 error = xfs_trans_commit(tp);
1031out_unlock:
1032 if (lock_flags)
1033 xfs_iunlock(ip, lock_flags);
1034 return error;
1035
1036out_trans_cancel:
1037 xfs_trans_cancel(tp);
1038 goto out_unlock;
1039}
1040
1041int
1042xfs_vn_setattr_size(
1043 struct dentry *dentry,
1044 struct iattr *iattr)
1045{
1046 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1047 int error;
1048
1049 trace_xfs_setattr(ip);
1050
1051 error = xfs_vn_change_ok(dentry, iattr);
1052 if (error)
1053 return error;
1054 return xfs_setattr_size(ip, iattr);
1055}
1056
1057STATIC int
1058xfs_vn_setattr(
1059 struct dentry *dentry,
1060 struct iattr *iattr)
1061{
1062 int error;
1063
1064 if (iattr->ia_valid & ATTR_SIZE) {
1065 struct inode *inode = d_inode(dentry);
1066 struct xfs_inode *ip = XFS_I(inode);
1067 uint iolock;
1068
1069 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1070 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1071
1072 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1073 if (error) {
1074 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1075 return error;
1076 }
1077
1078 error = xfs_vn_setattr_size(dentry, iattr);
1079 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1080 } else {
1081 error = xfs_vn_setattr_nonsize(dentry, iattr);
1082 }
1083
1084 return error;
1085}
1086
1087STATIC int
1088xfs_vn_update_time(
1089 struct inode *inode,
1090 struct timespec64 *now,
1091 int flags)
1092{
1093 struct xfs_inode *ip = XFS_I(inode);
1094 struct xfs_mount *mp = ip->i_mount;
1095 int log_flags = XFS_ILOG_TIMESTAMP;
1096 struct xfs_trans *tp;
1097 int error;
1098
1099 trace_xfs_update_time(ip);
1100
1101 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1102 if (!((flags & S_VERSION) &&
1103 inode_maybe_inc_iversion(inode, false)))
1104 return generic_update_time(inode, now, flags);
1105
1106 /* Capture the iversion update that just occurred */
1107 log_flags |= XFS_ILOG_CORE;
1108 }
1109
1110 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1111 if (error)
1112 return error;
1113
1114 xfs_ilock(ip, XFS_ILOCK_EXCL);
1115 if (flags & S_CTIME)
1116 inode->i_ctime = *now;
1117 if (flags & S_MTIME)
1118 inode->i_mtime = *now;
1119 if (flags & S_ATIME)
1120 inode->i_atime = *now;
1121
1122 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1123 xfs_trans_log_inode(tp, ip, log_flags);
1124 return xfs_trans_commit(tp);
1125}
1126
1127STATIC int
1128xfs_vn_fiemap(
1129 struct inode *inode,
1130 struct fiemap_extent_info *fieinfo,
1131 u64 start,
1132 u64 length)
1133{
1134 int error;
1135
1136 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1137 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1138 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1139 error = iomap_fiemap(inode, fieinfo, start, length,
1140 &xfs_xattr_iomap_ops);
1141 } else {
1142 error = iomap_fiemap(inode, fieinfo, start, length,
1143 &xfs_read_iomap_ops);
1144 }
1145 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1146
1147 return error;
1148}
1149
1150STATIC int
1151xfs_vn_tmpfile(
1152 struct inode *dir,
1153 struct dentry *dentry,
1154 umode_t mode)
1155{
1156 return xfs_generic_create(dir, dentry, mode, 0, true);
1157}
1158
1159static const struct inode_operations xfs_inode_operations = {
1160 .get_acl = xfs_get_acl,
1161 .set_acl = xfs_set_acl,
1162 .getattr = xfs_vn_getattr,
1163 .setattr = xfs_vn_setattr,
1164 .listxattr = xfs_vn_listxattr,
1165 .fiemap = xfs_vn_fiemap,
1166 .update_time = xfs_vn_update_time,
1167};
1168
1169static const struct inode_operations xfs_dir_inode_operations = {
1170 .create = xfs_vn_create,
1171 .lookup = xfs_vn_lookup,
1172 .link = xfs_vn_link,
1173 .unlink = xfs_vn_unlink,
1174 .symlink = xfs_vn_symlink,
1175 .mkdir = xfs_vn_mkdir,
1176 /*
1177 * Yes, XFS uses the same method for rmdir and unlink.
1178 *
1179 * There are some subtile differences deeper in the code,
1180 * but we use S_ISDIR to check for those.
1181 */
1182 .rmdir = xfs_vn_unlink,
1183 .mknod = xfs_vn_mknod,
1184 .rename = xfs_vn_rename,
1185 .get_acl = xfs_get_acl,
1186 .set_acl = xfs_set_acl,
1187 .getattr = xfs_vn_getattr,
1188 .setattr = xfs_vn_setattr,
1189 .listxattr = xfs_vn_listxattr,
1190 .update_time = xfs_vn_update_time,
1191 .tmpfile = xfs_vn_tmpfile,
1192};
1193
1194static const struct inode_operations xfs_dir_ci_inode_operations = {
1195 .create = xfs_vn_create,
1196 .lookup = xfs_vn_ci_lookup,
1197 .link = xfs_vn_link,
1198 .unlink = xfs_vn_unlink,
1199 .symlink = xfs_vn_symlink,
1200 .mkdir = xfs_vn_mkdir,
1201 /*
1202 * Yes, XFS uses the same method for rmdir and unlink.
1203 *
1204 * There are some subtile differences deeper in the code,
1205 * but we use S_ISDIR to check for those.
1206 */
1207 .rmdir = xfs_vn_unlink,
1208 .mknod = xfs_vn_mknod,
1209 .rename = xfs_vn_rename,
1210 .get_acl = xfs_get_acl,
1211 .set_acl = xfs_set_acl,
1212 .getattr = xfs_vn_getattr,
1213 .setattr = xfs_vn_setattr,
1214 .listxattr = xfs_vn_listxattr,
1215 .update_time = xfs_vn_update_time,
1216 .tmpfile = xfs_vn_tmpfile,
1217};
1218
1219static const struct inode_operations xfs_symlink_inode_operations = {
1220 .get_link = xfs_vn_get_link,
1221 .getattr = xfs_vn_getattr,
1222 .setattr = xfs_vn_setattr,
1223 .listxattr = xfs_vn_listxattr,
1224 .update_time = xfs_vn_update_time,
1225};
1226
1227static const struct inode_operations xfs_inline_symlink_inode_operations = {
1228 .get_link = xfs_vn_get_link_inline,
1229 .getattr = xfs_vn_getattr,
1230 .setattr = xfs_vn_setattr,
1231 .listxattr = xfs_vn_listxattr,
1232 .update_time = xfs_vn_update_time,
1233};
1234
1235/* Figure out if this file actually supports DAX. */
1236static bool
1237xfs_inode_supports_dax(
1238 struct xfs_inode *ip)
1239{
1240 struct xfs_mount *mp = ip->i_mount;
1241
1242 /* Only supported on regular files. */
1243 if (!S_ISREG(VFS_I(ip)->i_mode))
1244 return false;
1245
1246 /* Only supported on non-reflinked files. */
1247 if (xfs_is_reflink_inode(ip))
1248 return false;
1249
1250 /* Block size must match page size */
1251 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1252 return false;
1253
1254 /* Device has to support DAX too. */
1255 return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1256}
1257
1258static bool
1259xfs_inode_should_enable_dax(
1260 struct xfs_inode *ip)
1261{
1262 if (!IS_ENABLED(CONFIG_FS_DAX))
1263 return false;
1264 if (ip->i_mount->m_flags & XFS_MOUNT_DAX_NEVER)
1265 return false;
1266 if (!xfs_inode_supports_dax(ip))
1267 return false;
1268 if (ip->i_mount->m_flags & XFS_MOUNT_DAX_ALWAYS)
1269 return true;
1270 if (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
1271 return true;
1272 return false;
1273}
1274
1275void
1276xfs_diflags_to_iflags(
1277 struct xfs_inode *ip,
1278 bool init)
1279{
1280 struct inode *inode = VFS_I(ip);
1281 unsigned int xflags = xfs_ip2xflags(ip);
1282 unsigned int flags = 0;
1283
1284 ASSERT(!(IS_DAX(inode) && init));
1285
1286 if (xflags & FS_XFLAG_IMMUTABLE)
1287 flags |= S_IMMUTABLE;
1288 if (xflags & FS_XFLAG_APPEND)
1289 flags |= S_APPEND;
1290 if (xflags & FS_XFLAG_SYNC)
1291 flags |= S_SYNC;
1292 if (xflags & FS_XFLAG_NOATIME)
1293 flags |= S_NOATIME;
1294 if (init && xfs_inode_should_enable_dax(ip))
1295 flags |= S_DAX;
1296
1297 /*
1298 * S_DAX can only be set during inode initialization and is never set by
1299 * the VFS, so we cannot mask off S_DAX in i_flags.
1300 */
1301 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1302 inode->i_flags |= flags;
1303}
1304
1305/*
1306 * Initialize the Linux inode.
1307 *
1308 * When reading existing inodes from disk this is called directly from xfs_iget,
1309 * when creating a new inode it is called from xfs_ialloc after setting up the
1310 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1311 * it up to the caller to deal with unlocking the inode appropriately.
1312 */
1313void
1314xfs_setup_inode(
1315 struct xfs_inode *ip)
1316{
1317 struct inode *inode = &ip->i_vnode;
1318 gfp_t gfp_mask;
1319
1320 inode->i_ino = ip->i_ino;
1321 inode->i_state = I_NEW;
1322
1323 inode_sb_list_add(inode);
1324 /* make the inode look hashed for the writeback code */
1325 inode_fake_hash(inode);
1326
1327 i_size_write(inode, ip->i_d.di_size);
1328 xfs_diflags_to_iflags(ip, true);
1329
1330 if (S_ISDIR(inode->i_mode)) {
1331 /*
1332 * We set the i_rwsem class here to avoid potential races with
1333 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1334 * after a filehandle lookup has already found the inode in
1335 * cache before it has been unlocked via unlock_new_inode().
1336 */
1337 lockdep_set_class(&inode->i_rwsem,
1338 &inode->i_sb->s_type->i_mutex_dir_key);
1339 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1340 } else {
1341 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1342 }
1343
1344 /*
1345 * Ensure all page cache allocations are done from GFP_NOFS context to
1346 * prevent direct reclaim recursion back into the filesystem and blowing
1347 * stacks or deadlocking.
1348 */
1349 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1350 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1351
1352 /*
1353 * If there is no attribute fork no ACL can exist on this inode,
1354 * and it can't have any file capabilities attached to it either.
1355 */
1356 if (!XFS_IFORK_Q(ip)) {
1357 inode_has_no_xattr(inode);
1358 cache_no_acl(inode);
1359 }
1360}
1361
1362void
1363xfs_setup_iops(
1364 struct xfs_inode *ip)
1365{
1366 struct inode *inode = &ip->i_vnode;
1367
1368 switch (inode->i_mode & S_IFMT) {
1369 case S_IFREG:
1370 inode->i_op = &xfs_inode_operations;
1371 inode->i_fop = &xfs_file_operations;
1372 if (IS_DAX(inode))
1373 inode->i_mapping->a_ops = &xfs_dax_aops;
1374 else
1375 inode->i_mapping->a_ops = &xfs_address_space_operations;
1376 break;
1377 case S_IFDIR:
1378 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1379 inode->i_op = &xfs_dir_ci_inode_operations;
1380 else
1381 inode->i_op = &xfs_dir_inode_operations;
1382 inode->i_fop = &xfs_dir_file_operations;
1383 break;
1384 case S_IFLNK:
1385 if (ip->i_df.if_flags & XFS_IFINLINE)
1386 inode->i_op = &xfs_inline_symlink_inode_operations;
1387 else
1388 inode->i_op = &xfs_symlink_inode_operations;
1389 break;
1390 default:
1391 inode->i_op = &xfs_inode_operations;
1392 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1393 break;
1394 }
1395}