1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
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_da_format.h"
14 #include "xfs_inode.h"
16 #include "xfs_bmap_util.h"
18 #include "xfs_quota.h"
19 #include "xfs_error.h"
21 #include "xfs_trans.h"
22 #include "xfs_trace.h"
23 #include "xfs_icache.h"
24 #include "xfs_symlink.h"
25 #include "xfs_da_btree.h"
27 #include "xfs_trans_space.h"
28 #include "xfs_iomap.h"
29 #include "xfs_defer.h"
31 #include <linux/capability.h>
32 #include <linux/xattr.h>
33 #include <linux/posix_acl.h>
34 #include <linux/security.h>
35 #include <linux/iomap.h>
36 #include <linux/slab.h>
37 #include <linux/iversion.h>
40 * Directories have different lock order w.r.t. mmap_sem compared to regular
41 * files. This is due to readdir potentially triggering page faults on a user
42 * buffer inside filldir(), and this happens with the ilock on the directory
43 * held. For regular files, the lock order is the other way around - the
44 * mmap_sem is taken during the page fault, and then we lock the ilock to do
45 * block mapping. Hence we need a different class for the directory ilock so
46 * that lockdep can tell them apart.
48 static struct lock_class_key xfs_nondir_ilock_class;
49 static struct lock_class_key xfs_dir_ilock_class;
54 const struct xattr *xattr_array,
57 const struct xattr *xattr;
58 struct xfs_inode *ip = XFS_I(inode);
61 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
62 error = xfs_attr_set(ip, xattr->name, xattr->value,
63 xattr->value_len, ATTR_SECURE);
71 * Hook in SELinux. This is not quite correct yet, what we really need
72 * here (as we do for default ACLs) is a mechanism by which creation of
73 * these attrs can be journalled at inode creation time (along with the
74 * inode, of course, such that log replay can't cause these to be lost).
81 const struct qstr *qstr)
83 return security_inode_init_security(inode, dir, qstr,
84 &xfs_initxattrs, NULL);
89 struct xfs_name *namep,
90 struct dentry *dentry)
92 namep->name = dentry->d_name.name;
93 namep->len = dentry->d_name.len;
94 namep->type = XFS_DIR3_FT_UNKNOWN;
98 xfs_dentry_mode_to_name(
99 struct xfs_name *namep,
100 struct dentry *dentry,
103 namep->name = dentry->d_name.name;
104 namep->len = dentry->d_name.len;
105 namep->type = xfs_mode_to_ftype(mode);
107 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
108 return -EFSCORRUPTED;
117 struct dentry *dentry)
119 struct xfs_name teardown;
122 * If we can't add the ACL or we fail in
123 * xfs_init_security we must back out.
124 * ENOSPC can hit here, among other things.
126 xfs_dentry_to_name(&teardown, dentry);
128 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
134 struct dentry *dentry,
137 bool tmpfile) /* unnamed file */
140 struct xfs_inode *ip = NULL;
141 struct posix_acl *default_acl, *acl;
142 struct xfs_name name;
146 * Irix uses Missed'em'V split, but doesn't want to see
147 * the upper 5 bits of (14bit) major.
149 if (S_ISCHR(mode) || S_ISBLK(mode)) {
150 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
156 error = posix_acl_create(dir, &mode, &default_acl, &acl);
160 /* Verify mode is valid also for tmpfile case */
161 error = xfs_dentry_mode_to_name(&name, dentry, mode);
166 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
168 error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
175 error = xfs_init_security(inode, dir, &dentry->d_name);
177 goto out_cleanup_inode;
179 #ifdef CONFIG_XFS_POSIX_ACL
181 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
183 goto out_cleanup_inode;
186 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
188 goto out_cleanup_inode;
195 d_tmpfile(dentry, inode);
197 d_instantiate(dentry, inode);
199 xfs_finish_inode_setup(ip);
203 posix_acl_release(default_acl);
205 posix_acl_release(acl);
209 xfs_finish_inode_setup(ip);
211 xfs_cleanup_inode(dir, inode, dentry);
219 struct dentry *dentry,
223 return xfs_generic_create(dir, dentry, mode, rdev, false);
229 struct dentry *dentry,
233 return xfs_vn_mknod(dir, dentry, mode, 0);
239 struct dentry *dentry,
242 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
245 STATIC struct dentry *
248 struct dentry *dentry,
252 struct xfs_inode *cip;
253 struct xfs_name name;
256 if (dentry->d_name.len >= MAXNAMELEN)
257 return ERR_PTR(-ENAMETOOLONG);
259 xfs_dentry_to_name(&name, dentry);
260 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
263 else if (likely(error == -ENOENT))
266 inode = ERR_PTR(error);
267 return d_splice_alias(inode, dentry);
270 STATIC struct dentry *
273 struct dentry *dentry,
276 struct xfs_inode *ip;
277 struct xfs_name xname;
278 struct xfs_name ci_name;
282 if (dentry->d_name.len >= MAXNAMELEN)
283 return ERR_PTR(-ENAMETOOLONG);
285 xfs_dentry_to_name(&xname, dentry);
286 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
287 if (unlikely(error)) {
288 if (unlikely(error != -ENOENT))
289 return ERR_PTR(error);
291 * call d_add(dentry, NULL) here when d_drop_negative_children
292 * is called in xfs_vn_mknod (ie. allow negative dentries
293 * with CI filesystems).
298 /* if exact match, just splice and exit */
300 return d_splice_alias(VFS_I(ip), dentry);
302 /* else case-insensitive match... */
303 dname.name = ci_name.name;
304 dname.len = ci_name.len;
305 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
306 kmem_free(ci_name.name);
312 struct dentry *old_dentry,
314 struct dentry *dentry)
316 struct inode *inode = d_inode(old_dentry);
317 struct xfs_name name;
320 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
324 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
329 d_instantiate(dentry, inode);
336 struct dentry *dentry)
338 struct xfs_name name;
341 xfs_dentry_to_name(&name, dentry);
343 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
348 * With unlink, the VFS makes the dentry "negative": no inode,
349 * but still hashed. This is incompatible with case-insensitive
350 * mode, so invalidate (unhash) the dentry in CI-mode.
352 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
353 d_invalidate(dentry);
360 struct dentry *dentry,
364 struct xfs_inode *cip = NULL;
365 struct xfs_name name;
370 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
371 error = xfs_dentry_mode_to_name(&name, dentry, mode);
375 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
381 error = xfs_init_security(inode, dir, &dentry->d_name);
383 goto out_cleanup_inode;
387 d_instantiate(dentry, inode);
388 xfs_finish_inode_setup(cip);
392 xfs_finish_inode_setup(cip);
393 xfs_cleanup_inode(dir, inode, dentry);
402 struct dentry *odentry,
404 struct dentry *ndentry,
407 struct inode *new_inode = d_inode(ndentry);
410 struct xfs_name oname;
411 struct xfs_name nname;
413 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
416 /* if we are exchanging files, we need to set i_mode of both files */
417 if (flags & RENAME_EXCHANGE)
418 omode = d_inode(ndentry)->i_mode;
420 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
421 if (omode && unlikely(error))
424 error = xfs_dentry_mode_to_name(&nname, ndentry,
425 d_inode(odentry)->i_mode);
429 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
431 new_inode ? XFS_I(new_inode) : NULL, flags);
435 * careful here - this function can get called recursively, so
436 * we need to be very careful about how much stack we use.
437 * uio is kmalloced for this reason...
441 struct dentry *dentry,
443 struct delayed_call *done)
449 return ERR_PTR(-ECHILD);
451 link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
455 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
459 set_delayed_call(done, kfree_link, link);
465 return ERR_PTR(error);
469 xfs_vn_get_link_inline(
470 struct dentry *dentry,
472 struct delayed_call *done)
476 ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
479 * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
482 link = XFS_I(inode)->i_df.if_u1.if_data;
484 return ERR_PTR(-EFSCORRUPTED);
490 const struct path *path,
493 unsigned int query_flags)
495 struct inode *inode = d_inode(path->dentry);
496 struct xfs_inode *ip = XFS_I(inode);
497 struct xfs_mount *mp = ip->i_mount;
499 trace_xfs_getattr(ip);
501 if (XFS_FORCED_SHUTDOWN(mp))
504 stat->size = XFS_ISIZE(ip);
505 stat->dev = inode->i_sb->s_dev;
506 stat->mode = inode->i_mode;
507 stat->nlink = inode->i_nlink;
508 stat->uid = inode->i_uid;
509 stat->gid = inode->i_gid;
510 stat->ino = ip->i_ino;
511 stat->atime = inode->i_atime;
512 stat->mtime = inode->i_mtime;
513 stat->ctime = inode->i_ctime;
515 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
517 if (ip->i_d.di_version == 3) {
518 if (request_mask & STATX_BTIME) {
519 stat->result_mask |= STATX_BTIME;
520 stat->btime.tv_sec = ip->i_d.di_crtime.t_sec;
521 stat->btime.tv_nsec = ip->i_d.di_crtime.t_nsec;
525 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
526 stat->attributes |= STATX_ATTR_IMMUTABLE;
527 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
528 stat->attributes |= STATX_ATTR_APPEND;
529 if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
530 stat->attributes |= STATX_ATTR_NODUMP;
532 switch (inode->i_mode & S_IFMT) {
535 stat->blksize = BLKDEV_IOSIZE;
536 stat->rdev = inode->i_rdev;
539 if (XFS_IS_REALTIME_INODE(ip)) {
541 * If the file blocks are being allocated from a
542 * realtime volume, then return the inode's realtime
543 * extent size or the realtime volume's extent size.
546 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
548 stat->blksize = xfs_preferred_iosize(mp);
558 struct xfs_inode *ip,
561 struct inode *inode = VFS_I(ip);
562 umode_t mode = iattr->ia_mode;
564 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
566 inode->i_mode &= S_IFMT;
567 inode->i_mode |= mode & ~S_IFMT;
572 struct xfs_inode *ip,
575 struct inode *inode = VFS_I(ip);
577 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
579 if (iattr->ia_valid & ATTR_ATIME)
580 inode->i_atime = iattr->ia_atime;
581 if (iattr->ia_valid & ATTR_CTIME)
582 inode->i_ctime = iattr->ia_ctime;
583 if (iattr->ia_valid & ATTR_MTIME)
584 inode->i_mtime = iattr->ia_mtime;
589 struct dentry *dentry,
592 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
594 if (mp->m_flags & XFS_MOUNT_RDONLY)
597 if (XFS_FORCED_SHUTDOWN(mp))
600 return setattr_prepare(dentry, iattr);
604 * Set non-size attributes of an inode.
606 * Caution: The caller of this function is responsible for calling
607 * setattr_prepare() or otherwise verifying the change is fine.
611 struct xfs_inode *ip,
615 xfs_mount_t *mp = ip->i_mount;
616 struct inode *inode = VFS_I(ip);
617 int mask = iattr->ia_valid;
620 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
621 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
622 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
623 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
625 ASSERT((mask & ATTR_SIZE) == 0);
628 * If disk quotas is on, we make sure that the dquots do exist on disk,
629 * before we start any other transactions. Trying to do this later
630 * is messy. We don't care to take a readlock to look at the ids
631 * in inode here, because we can't hold it across the trans_reserve.
632 * If the IDs do change before we take the ilock, we're covered
633 * because the i_*dquot fields will get updated anyway.
635 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
638 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
640 qflags |= XFS_QMOPT_UQUOTA;
644 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
646 qflags |= XFS_QMOPT_GQUOTA;
652 * We take a reference when we initialize udqp and gdqp,
653 * so it is important that we never blindly double trip on
654 * the same variable. See xfs_create() for an example.
656 ASSERT(udqp == NULL);
657 ASSERT(gdqp == NULL);
658 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
659 xfs_kgid_to_gid(gid),
661 qflags, &udqp, &gdqp, NULL);
666 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
670 xfs_ilock(ip, XFS_ILOCK_EXCL);
671 xfs_trans_ijoin(tp, ip, 0);
674 * Change file ownership. Must be the owner or privileged.
676 if (mask & (ATTR_UID|ATTR_GID)) {
678 * These IDs could have changed since we last looked at them.
679 * But, we're assured that if the ownership did change
680 * while we didn't have the inode locked, inode's dquot(s)
681 * would have changed also.
685 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
686 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
689 * Do a quota reservation only if uid/gid is actually
692 if (XFS_IS_QUOTA_RUNNING(mp) &&
693 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
694 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
696 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
697 NULL, capable(CAP_FOWNER) ?
698 XFS_QMOPT_FORCE_RES : 0);
699 if (error) /* out of quota */
705 * Change file ownership. Must be the owner or privileged.
707 if (mask & (ATTR_UID|ATTR_GID)) {
709 * CAP_FSETID overrides the following restrictions:
711 * The set-user-ID and set-group-ID bits of a file will be
712 * cleared upon successful return from chown()
714 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
715 !capable(CAP_FSETID))
716 inode->i_mode &= ~(S_ISUID|S_ISGID);
719 * Change the ownerships and register quota modifications
720 * in the transaction.
722 if (!uid_eq(iuid, uid)) {
723 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
724 ASSERT(mask & ATTR_UID);
726 olddquot1 = xfs_qm_vop_chown(tp, ip,
727 &ip->i_udquot, udqp);
729 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
732 if (!gid_eq(igid, gid)) {
733 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
734 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
735 !XFS_IS_PQUOTA_ON(mp));
736 ASSERT(mask & ATTR_GID);
738 olddquot2 = xfs_qm_vop_chown(tp, ip,
739 &ip->i_gdquot, gdqp);
741 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
746 if (mask & ATTR_MODE)
747 xfs_setattr_mode(ip, iattr);
748 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
749 xfs_setattr_time(ip, iattr);
751 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
753 XFS_STATS_INC(mp, xs_ig_attrchg);
755 if (mp->m_flags & XFS_MOUNT_WSYNC)
756 xfs_trans_set_sync(tp);
757 error = xfs_trans_commit(tp);
759 xfs_iunlock(ip, XFS_ILOCK_EXCL);
762 * Release any dquot(s) the inode had kept before chown.
764 xfs_qm_dqrele(olddquot1);
765 xfs_qm_dqrele(olddquot2);
773 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
774 * update. We could avoid this with linked transactions
775 * and passing down the transaction pointer all the way
776 * to attr_set. No previous user of the generic
777 * Posix ACL code seems to care about this issue either.
779 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
780 error = posix_acl_chmod(inode, inode->i_mode);
788 xfs_trans_cancel(tp);
796 xfs_vn_setattr_nonsize(
797 struct dentry *dentry,
800 struct xfs_inode *ip = XFS_I(d_inode(dentry));
803 trace_xfs_setattr(ip);
805 error = xfs_vn_change_ok(dentry, iattr);
808 return xfs_setattr_nonsize(ip, iattr, 0);
812 * Truncate file. Must have write permission and not be a directory.
814 * Caution: The caller of this function is responsible for calling
815 * setattr_prepare() or otherwise verifying the change is fine.
819 struct xfs_inode *ip,
822 struct xfs_mount *mp = ip->i_mount;
823 struct inode *inode = VFS_I(ip);
824 xfs_off_t oldsize, newsize;
825 struct xfs_trans *tp;
828 bool did_zeroing = false;
830 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
831 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
832 ASSERT(S_ISREG(inode->i_mode));
833 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
834 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
836 oldsize = inode->i_size;
837 newsize = iattr->ia_size;
840 * Short circuit the truncate case for zero length files.
842 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
843 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
847 * Use the regular setattr path to update the timestamps.
849 iattr->ia_valid &= ~ATTR_SIZE;
850 return xfs_setattr_nonsize(ip, iattr, 0);
854 * Make sure that the dquots are attached to the inode.
856 error = xfs_qm_dqattach(ip);
861 * Wait for all direct I/O to complete.
863 inode_dio_wait(inode);
866 * File data changes must be complete before we start the transaction to
867 * modify the inode. This needs to be done before joining the inode to
868 * the transaction because the inode cannot be unlocked once it is a
869 * part of the transaction.
871 * Start with zeroing any data beyond EOF that we may expose on file
872 * extension, or zeroing out the rest of the block on a downward
875 if (newsize > oldsize) {
876 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
877 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
878 &did_zeroing, &xfs_iomap_ops);
880 error = iomap_truncate_page(inode, newsize, &did_zeroing,
888 * We've already locked out new page faults, so now we can safely remove
889 * pages from the page cache knowing they won't get refaulted until we
890 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
891 * complete. The truncate_setsize() call also cleans partial EOF page
892 * PTEs on extending truncates and hence ensures sub-page block size
893 * filesystems are correctly handled, too.
895 * We have to do all the page cache truncate work outside the
896 * transaction context as the "lock" order is page lock->log space
897 * reservation as defined by extent allocation in the writeback path.
898 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
899 * having already truncated the in-memory version of the file (i.e. made
900 * user visible changes). There's not much we can do about this, except
901 * to hope that the caller sees ENOMEM and retries the truncate
904 * And we update in-core i_size and truncate page cache beyond newsize
905 * before writeback the [di_size, newsize] range, so we're guaranteed
906 * not to write stale data past the new EOF on truncate down.
908 truncate_setsize(inode, newsize);
911 * We are going to log the inode size change in this transaction so
912 * any previous writes that are beyond the on disk EOF and the new
913 * EOF that have not been written out need to be written here. If we
914 * do not write the data out, we expose ourselves to the null files
915 * problem. Note that this includes any block zeroing we did above;
916 * otherwise those blocks may not be zeroed after a crash.
919 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
920 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
921 ip->i_d.di_size, newsize - 1);
926 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
930 lock_flags |= XFS_ILOCK_EXCL;
931 xfs_ilock(ip, XFS_ILOCK_EXCL);
932 xfs_trans_ijoin(tp, ip, 0);
935 * Only change the c/mtime if we are changing the size or we are
936 * explicitly asked to change it. This handles the semantic difference
937 * between truncate() and ftruncate() as implemented in the VFS.
939 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
940 * special case where we need to update the times despite not having
941 * these flags set. For all other operations the VFS set these flags
942 * explicitly if it wants a timestamp update.
944 if (newsize != oldsize &&
945 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
946 iattr->ia_ctime = iattr->ia_mtime =
948 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
952 * The first thing we do is set the size to new_size permanently on
953 * disk. This way we don't have to worry about anyone ever being able
954 * to look at the data being freed even in the face of a crash.
955 * What we're getting around here is the case where we free a block, it
956 * is allocated to another file, it is written to, and then we crash.
957 * If the new data gets written to the file but the log buffers
958 * containing the free and reallocation don't, then we'd end up with
959 * garbage in the blocks being freed. As long as we make the new size
960 * permanent before actually freeing any blocks it doesn't matter if
961 * they get written to.
963 ip->i_d.di_size = newsize;
964 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
966 if (newsize <= oldsize) {
967 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
969 goto out_trans_cancel;
972 * Truncated "down", so we're removing references to old data
973 * here - if we delay flushing for a long time, we expose
974 * ourselves unduly to the notorious NULL files problem. So,
975 * we mark this inode and flush it when the file is closed,
976 * and do not wait the usual (long) time for writeout.
978 xfs_iflags_set(ip, XFS_ITRUNCATED);
980 /* A truncate down always removes post-EOF blocks. */
981 xfs_inode_clear_eofblocks_tag(ip);
984 if (iattr->ia_valid & ATTR_MODE)
985 xfs_setattr_mode(ip, iattr);
986 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
987 xfs_setattr_time(ip, iattr);
989 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
991 XFS_STATS_INC(mp, xs_ig_attrchg);
993 if (mp->m_flags & XFS_MOUNT_WSYNC)
994 xfs_trans_set_sync(tp);
996 error = xfs_trans_commit(tp);
999 xfs_iunlock(ip, lock_flags);
1003 xfs_trans_cancel(tp);
1008 xfs_vn_setattr_size(
1009 struct dentry *dentry,
1010 struct iattr *iattr)
1012 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1015 trace_xfs_setattr(ip);
1017 error = xfs_vn_change_ok(dentry, iattr);
1020 return xfs_setattr_size(ip, iattr);
1025 struct dentry *dentry,
1026 struct iattr *iattr)
1030 if (iattr->ia_valid & ATTR_SIZE) {
1031 struct inode *inode = d_inode(dentry);
1032 struct xfs_inode *ip = XFS_I(inode);
1035 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1036 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1038 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1040 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1044 error = xfs_vn_setattr_size(dentry, iattr);
1045 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1047 error = xfs_vn_setattr_nonsize(dentry, iattr);
1055 struct inode *inode,
1056 struct timespec64 *now,
1059 struct xfs_inode *ip = XFS_I(inode);
1060 struct xfs_mount *mp = ip->i_mount;
1061 int log_flags = XFS_ILOG_TIMESTAMP;
1062 struct xfs_trans *tp;
1065 trace_xfs_update_time(ip);
1067 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1068 if (!((flags & S_VERSION) &&
1069 inode_maybe_inc_iversion(inode, false)))
1070 return generic_update_time(inode, now, flags);
1072 /* Capture the iversion update that just occurred */
1073 log_flags |= XFS_ILOG_CORE;
1076 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1080 xfs_ilock(ip, XFS_ILOCK_EXCL);
1081 if (flags & S_CTIME)
1082 inode->i_ctime = *now;
1083 if (flags & S_MTIME)
1084 inode->i_mtime = *now;
1085 if (flags & S_ATIME)
1086 inode->i_atime = *now;
1088 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1089 xfs_trans_log_inode(tp, ip, log_flags);
1090 return xfs_trans_commit(tp);
1095 struct inode *inode,
1096 struct fiemap_extent_info *fieinfo,
1102 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1103 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1104 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1105 error = iomap_fiemap(inode, fieinfo, start, length,
1106 &xfs_xattr_iomap_ops);
1108 error = iomap_fiemap(inode, fieinfo, start, length,
1111 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1119 struct dentry *dentry,
1122 return xfs_generic_create(dir, dentry, mode, 0, true);
1125 static const struct inode_operations xfs_inode_operations = {
1126 .get_acl = xfs_get_acl,
1127 .set_acl = xfs_set_acl,
1128 .getattr = xfs_vn_getattr,
1129 .setattr = xfs_vn_setattr,
1130 .listxattr = xfs_vn_listxattr,
1131 .fiemap = xfs_vn_fiemap,
1132 .update_time = xfs_vn_update_time,
1135 static const struct inode_operations xfs_dir_inode_operations = {
1136 .create = xfs_vn_create,
1137 .lookup = xfs_vn_lookup,
1138 .link = xfs_vn_link,
1139 .unlink = xfs_vn_unlink,
1140 .symlink = xfs_vn_symlink,
1141 .mkdir = xfs_vn_mkdir,
1143 * Yes, XFS uses the same method for rmdir and unlink.
1145 * There are some subtile differences deeper in the code,
1146 * but we use S_ISDIR to check for those.
1148 .rmdir = xfs_vn_unlink,
1149 .mknod = xfs_vn_mknod,
1150 .rename = xfs_vn_rename,
1151 .get_acl = xfs_get_acl,
1152 .set_acl = xfs_set_acl,
1153 .getattr = xfs_vn_getattr,
1154 .setattr = xfs_vn_setattr,
1155 .listxattr = xfs_vn_listxattr,
1156 .update_time = xfs_vn_update_time,
1157 .tmpfile = xfs_vn_tmpfile,
1160 static const struct inode_operations xfs_dir_ci_inode_operations = {
1161 .create = xfs_vn_create,
1162 .lookup = xfs_vn_ci_lookup,
1163 .link = xfs_vn_link,
1164 .unlink = xfs_vn_unlink,
1165 .symlink = xfs_vn_symlink,
1166 .mkdir = xfs_vn_mkdir,
1168 * Yes, XFS uses the same method for rmdir and unlink.
1170 * There are some subtile differences deeper in the code,
1171 * but we use S_ISDIR to check for those.
1173 .rmdir = xfs_vn_unlink,
1174 .mknod = xfs_vn_mknod,
1175 .rename = xfs_vn_rename,
1176 .get_acl = xfs_get_acl,
1177 .set_acl = xfs_set_acl,
1178 .getattr = xfs_vn_getattr,
1179 .setattr = xfs_vn_setattr,
1180 .listxattr = xfs_vn_listxattr,
1181 .update_time = xfs_vn_update_time,
1182 .tmpfile = xfs_vn_tmpfile,
1185 static const struct inode_operations xfs_symlink_inode_operations = {
1186 .get_link = xfs_vn_get_link,
1187 .getattr = xfs_vn_getattr,
1188 .setattr = xfs_vn_setattr,
1189 .listxattr = xfs_vn_listxattr,
1190 .update_time = xfs_vn_update_time,
1193 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1194 .get_link = xfs_vn_get_link_inline,
1195 .getattr = xfs_vn_getattr,
1196 .setattr = xfs_vn_setattr,
1197 .listxattr = xfs_vn_listxattr,
1198 .update_time = xfs_vn_update_time,
1201 /* Figure out if this file actually supports DAX. */
1203 xfs_inode_supports_dax(
1204 struct xfs_inode *ip)
1206 struct xfs_mount *mp = ip->i_mount;
1208 /* Only supported on non-reflinked files. */
1209 if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
1212 /* DAX mount option or DAX iflag must be set. */
1213 if (!(mp->m_flags & XFS_MOUNT_DAX) &&
1214 !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1217 /* Block size must match page size */
1218 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1221 /* Device has to support DAX too. */
1222 return xfs_find_daxdev_for_inode(VFS_I(ip)) != NULL;
1226 xfs_diflags_to_iflags(
1227 struct inode *inode,
1228 struct xfs_inode *ip)
1230 uint16_t flags = ip->i_d.di_flags;
1232 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1235 if (flags & XFS_DIFLAG_IMMUTABLE)
1236 inode->i_flags |= S_IMMUTABLE;
1237 if (flags & XFS_DIFLAG_APPEND)
1238 inode->i_flags |= S_APPEND;
1239 if (flags & XFS_DIFLAG_SYNC)
1240 inode->i_flags |= S_SYNC;
1241 if (flags & XFS_DIFLAG_NOATIME)
1242 inode->i_flags |= S_NOATIME;
1243 if (xfs_inode_supports_dax(ip))
1244 inode->i_flags |= S_DAX;
1248 * Initialize the Linux inode.
1250 * When reading existing inodes from disk this is called directly from xfs_iget,
1251 * when creating a new inode it is called from xfs_ialloc after setting up the
1252 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1253 * it up to the caller to deal with unlocking the inode appropriately.
1257 struct xfs_inode *ip)
1259 struct inode *inode = &ip->i_vnode;
1262 inode->i_ino = ip->i_ino;
1263 inode->i_state = I_NEW;
1265 inode_sb_list_add(inode);
1266 /* make the inode look hashed for the writeback code */
1267 inode_fake_hash(inode);
1269 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1270 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1272 i_size_write(inode, ip->i_d.di_size);
1273 xfs_diflags_to_iflags(inode, ip);
1275 if (S_ISDIR(inode->i_mode)) {
1277 * We set the i_rwsem class here to avoid potential races with
1278 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1279 * after a filehandle lookup has already found the inode in
1280 * cache before it has been unlocked via unlock_new_inode().
1282 lockdep_set_class(&inode->i_rwsem,
1283 &inode->i_sb->s_type->i_mutex_dir_key);
1284 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1285 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1287 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1288 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1292 * Ensure all page cache allocations are done from GFP_NOFS context to
1293 * prevent direct reclaim recursion back into the filesystem and blowing
1294 * stacks or deadlocking.
1296 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1297 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1300 * If there is no attribute fork no ACL can exist on this inode,
1301 * and it can't have any file capabilities attached to it either.
1303 if (!XFS_IFORK_Q(ip)) {
1304 inode_has_no_xattr(inode);
1305 cache_no_acl(inode);
1311 struct xfs_inode *ip)
1313 struct inode *inode = &ip->i_vnode;
1315 switch (inode->i_mode & S_IFMT) {
1317 inode->i_op = &xfs_inode_operations;
1318 inode->i_fop = &xfs_file_operations;
1320 inode->i_mapping->a_ops = &xfs_dax_aops;
1322 inode->i_mapping->a_ops = &xfs_address_space_operations;
1325 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1326 inode->i_op = &xfs_dir_ci_inode_operations;
1328 inode->i_op = &xfs_dir_inode_operations;
1329 inode->i_fop = &xfs_dir_file_operations;
1332 if (ip->i_df.if_flags & XFS_IFINLINE)
1333 inode->i_op = &xfs_inline_symlink_inode_operations;
1335 inode->i_op = &xfs_symlink_inode_operations;
1338 inode->i_op = &xfs_inode_operations;
1339 init_special_inode(inode, inode->i_mode, inode->i_rdev);