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)
474 ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
475 return XFS_I(inode)->i_df.if_u1.if_data;
480 const struct path *path,
483 unsigned int query_flags)
485 struct inode *inode = d_inode(path->dentry);
486 struct xfs_inode *ip = XFS_I(inode);
487 struct xfs_mount *mp = ip->i_mount;
489 trace_xfs_getattr(ip);
491 if (XFS_FORCED_SHUTDOWN(mp))
494 stat->size = XFS_ISIZE(ip);
495 stat->dev = inode->i_sb->s_dev;
496 stat->mode = inode->i_mode;
497 stat->nlink = inode->i_nlink;
498 stat->uid = inode->i_uid;
499 stat->gid = inode->i_gid;
500 stat->ino = ip->i_ino;
501 stat->atime = inode->i_atime;
502 stat->mtime = inode->i_mtime;
503 stat->ctime = inode->i_ctime;
505 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
507 if (ip->i_d.di_version == 3) {
508 if (request_mask & STATX_BTIME) {
509 stat->result_mask |= STATX_BTIME;
510 stat->btime.tv_sec = ip->i_d.di_crtime.t_sec;
511 stat->btime.tv_nsec = ip->i_d.di_crtime.t_nsec;
515 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
516 stat->attributes |= STATX_ATTR_IMMUTABLE;
517 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
518 stat->attributes |= STATX_ATTR_APPEND;
519 if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
520 stat->attributes |= STATX_ATTR_NODUMP;
522 switch (inode->i_mode & S_IFMT) {
525 stat->blksize = BLKDEV_IOSIZE;
526 stat->rdev = inode->i_rdev;
529 if (XFS_IS_REALTIME_INODE(ip)) {
531 * If the file blocks are being allocated from a
532 * realtime volume, then return the inode's realtime
533 * extent size or the realtime volume's extent size.
536 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
538 stat->blksize = xfs_preferred_iosize(mp);
548 struct xfs_inode *ip,
551 struct inode *inode = VFS_I(ip);
552 umode_t mode = iattr->ia_mode;
554 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
556 inode->i_mode &= S_IFMT;
557 inode->i_mode |= mode & ~S_IFMT;
562 struct xfs_inode *ip,
565 struct inode *inode = VFS_I(ip);
567 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
569 if (iattr->ia_valid & ATTR_ATIME)
570 inode->i_atime = iattr->ia_atime;
571 if (iattr->ia_valid & ATTR_CTIME)
572 inode->i_ctime = iattr->ia_ctime;
573 if (iattr->ia_valid & ATTR_MTIME)
574 inode->i_mtime = iattr->ia_mtime;
579 struct dentry *dentry,
582 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
584 if (mp->m_flags & XFS_MOUNT_RDONLY)
587 if (XFS_FORCED_SHUTDOWN(mp))
590 return setattr_prepare(dentry, iattr);
594 * Set non-size attributes of an inode.
596 * Caution: The caller of this function is responsible for calling
597 * setattr_prepare() or otherwise verifying the change is fine.
601 struct xfs_inode *ip,
605 xfs_mount_t *mp = ip->i_mount;
606 struct inode *inode = VFS_I(ip);
607 int mask = iattr->ia_valid;
610 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
611 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
612 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
613 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
615 ASSERT((mask & ATTR_SIZE) == 0);
618 * If disk quotas is on, we make sure that the dquots do exist on disk,
619 * before we start any other transactions. Trying to do this later
620 * is messy. We don't care to take a readlock to look at the ids
621 * in inode here, because we can't hold it across the trans_reserve.
622 * If the IDs do change before we take the ilock, we're covered
623 * because the i_*dquot fields will get updated anyway.
625 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
628 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
630 qflags |= XFS_QMOPT_UQUOTA;
634 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
636 qflags |= XFS_QMOPT_GQUOTA;
642 * We take a reference when we initialize udqp and gdqp,
643 * so it is important that we never blindly double trip on
644 * the same variable. See xfs_create() for an example.
646 ASSERT(udqp == NULL);
647 ASSERT(gdqp == NULL);
648 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
649 xfs_kgid_to_gid(gid),
651 qflags, &udqp, &gdqp, NULL);
656 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
660 xfs_ilock(ip, XFS_ILOCK_EXCL);
661 xfs_trans_ijoin(tp, ip, 0);
664 * Change file ownership. Must be the owner or privileged.
666 if (mask & (ATTR_UID|ATTR_GID)) {
668 * These IDs could have changed since we last looked at them.
669 * But, we're assured that if the ownership did change
670 * while we didn't have the inode locked, inode's dquot(s)
671 * would have changed also.
675 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
676 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
679 * Do a quota reservation only if uid/gid is actually
682 if (XFS_IS_QUOTA_RUNNING(mp) &&
683 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
684 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
686 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
687 NULL, capable(CAP_FOWNER) ?
688 XFS_QMOPT_FORCE_RES : 0);
689 if (error) /* out of quota */
695 * Change file ownership. Must be the owner or privileged.
697 if (mask & (ATTR_UID|ATTR_GID)) {
699 * CAP_FSETID overrides the following restrictions:
701 * The set-user-ID and set-group-ID bits of a file will be
702 * cleared upon successful return from chown()
704 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
705 !capable(CAP_FSETID))
706 inode->i_mode &= ~(S_ISUID|S_ISGID);
709 * Change the ownerships and register quota modifications
710 * in the transaction.
712 if (!uid_eq(iuid, uid)) {
713 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
714 ASSERT(mask & ATTR_UID);
716 olddquot1 = xfs_qm_vop_chown(tp, ip,
717 &ip->i_udquot, udqp);
719 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
722 if (!gid_eq(igid, gid)) {
723 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
724 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
725 !XFS_IS_PQUOTA_ON(mp));
726 ASSERT(mask & ATTR_GID);
728 olddquot2 = xfs_qm_vop_chown(tp, ip,
729 &ip->i_gdquot, gdqp);
731 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
736 if (mask & ATTR_MODE)
737 xfs_setattr_mode(ip, iattr);
738 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
739 xfs_setattr_time(ip, iattr);
741 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
743 XFS_STATS_INC(mp, xs_ig_attrchg);
745 if (mp->m_flags & XFS_MOUNT_WSYNC)
746 xfs_trans_set_sync(tp);
747 error = xfs_trans_commit(tp);
749 xfs_iunlock(ip, XFS_ILOCK_EXCL);
752 * Release any dquot(s) the inode had kept before chown.
754 xfs_qm_dqrele(olddquot1);
755 xfs_qm_dqrele(olddquot2);
763 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
764 * update. We could avoid this with linked transactions
765 * and passing down the transaction pointer all the way
766 * to attr_set. No previous user of the generic
767 * Posix ACL code seems to care about this issue either.
769 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
770 error = posix_acl_chmod(inode, inode->i_mode);
778 xfs_trans_cancel(tp);
786 xfs_vn_setattr_nonsize(
787 struct dentry *dentry,
790 struct xfs_inode *ip = XFS_I(d_inode(dentry));
793 trace_xfs_setattr(ip);
795 error = xfs_vn_change_ok(dentry, iattr);
798 return xfs_setattr_nonsize(ip, iattr, 0);
802 * Truncate file. Must have write permission and not be a directory.
804 * Caution: The caller of this function is responsible for calling
805 * setattr_prepare() or otherwise verifying the change is fine.
809 struct xfs_inode *ip,
812 struct xfs_mount *mp = ip->i_mount;
813 struct inode *inode = VFS_I(ip);
814 xfs_off_t oldsize, newsize;
815 struct xfs_trans *tp;
818 bool did_zeroing = false;
820 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
821 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
822 ASSERT(S_ISREG(inode->i_mode));
823 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
824 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
826 oldsize = inode->i_size;
827 newsize = iattr->ia_size;
830 * Short circuit the truncate case for zero length files.
832 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
833 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
837 * Use the regular setattr path to update the timestamps.
839 iattr->ia_valid &= ~ATTR_SIZE;
840 return xfs_setattr_nonsize(ip, iattr, 0);
844 * Make sure that the dquots are attached to the inode.
846 error = xfs_qm_dqattach(ip);
851 * Wait for all direct I/O to complete.
853 inode_dio_wait(inode);
856 * File data changes must be complete before we start the transaction to
857 * modify the inode. This needs to be done before joining the inode to
858 * the transaction because the inode cannot be unlocked once it is a
859 * part of the transaction.
861 * Start with zeroing any data beyond EOF that we may expose on file
862 * extension, or zeroing out the rest of the block on a downward
865 if (newsize > oldsize) {
866 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
867 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
868 &did_zeroing, &xfs_iomap_ops);
870 error = iomap_truncate_page(inode, newsize, &did_zeroing,
878 * We've already locked out new page faults, so now we can safely remove
879 * pages from the page cache knowing they won't get refaulted until we
880 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
881 * complete. The truncate_setsize() call also cleans partial EOF page
882 * PTEs on extending truncates and hence ensures sub-page block size
883 * filesystems are correctly handled, too.
885 * We have to do all the page cache truncate work outside the
886 * transaction context as the "lock" order is page lock->log space
887 * reservation as defined by extent allocation in the writeback path.
888 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
889 * having already truncated the in-memory version of the file (i.e. made
890 * user visible changes). There's not much we can do about this, except
891 * to hope that the caller sees ENOMEM and retries the truncate
894 * And we update in-core i_size and truncate page cache beyond newsize
895 * before writeback the [di_size, newsize] range, so we're guaranteed
896 * not to write stale data past the new EOF on truncate down.
898 truncate_setsize(inode, newsize);
901 * We are going to log the inode size change in this transaction so
902 * any previous writes that are beyond the on disk EOF and the new
903 * EOF that have not been written out need to be written here. If we
904 * do not write the data out, we expose ourselves to the null files
905 * problem. Note that this includes any block zeroing we did above;
906 * otherwise those blocks may not be zeroed after a crash.
909 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
910 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
911 ip->i_d.di_size, newsize - 1);
916 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
920 lock_flags |= XFS_ILOCK_EXCL;
921 xfs_ilock(ip, XFS_ILOCK_EXCL);
922 xfs_trans_ijoin(tp, ip, 0);
925 * Only change the c/mtime if we are changing the size or we are
926 * explicitly asked to change it. This handles the semantic difference
927 * between truncate() and ftruncate() as implemented in the VFS.
929 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
930 * special case where we need to update the times despite not having
931 * these flags set. For all other operations the VFS set these flags
932 * explicitly if it wants a timestamp update.
934 if (newsize != oldsize &&
935 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
936 iattr->ia_ctime = iattr->ia_mtime =
938 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
942 * The first thing we do is set the size to new_size permanently on
943 * disk. This way we don't have to worry about anyone ever being able
944 * to look at the data being freed even in the face of a crash.
945 * What we're getting around here is the case where we free a block, it
946 * is allocated to another file, it is written to, and then we crash.
947 * If the new data gets written to the file but the log buffers
948 * containing the free and reallocation don't, then we'd end up with
949 * garbage in the blocks being freed. As long as we make the new size
950 * permanent before actually freeing any blocks it doesn't matter if
951 * they get written to.
953 ip->i_d.di_size = newsize;
954 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
956 if (newsize <= oldsize) {
957 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
959 goto out_trans_cancel;
962 * Truncated "down", so we're removing references to old data
963 * here - if we delay flushing for a long time, we expose
964 * ourselves unduly to the notorious NULL files problem. So,
965 * we mark this inode and flush it when the file is closed,
966 * and do not wait the usual (long) time for writeout.
968 xfs_iflags_set(ip, XFS_ITRUNCATED);
970 /* A truncate down always removes post-EOF blocks. */
971 xfs_inode_clear_eofblocks_tag(ip);
974 if (iattr->ia_valid & ATTR_MODE)
975 xfs_setattr_mode(ip, iattr);
976 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
977 xfs_setattr_time(ip, iattr);
979 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
981 XFS_STATS_INC(mp, xs_ig_attrchg);
983 if (mp->m_flags & XFS_MOUNT_WSYNC)
984 xfs_trans_set_sync(tp);
986 error = xfs_trans_commit(tp);
989 xfs_iunlock(ip, lock_flags);
993 xfs_trans_cancel(tp);
999 struct dentry *dentry,
1000 struct iattr *iattr)
1002 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1005 trace_xfs_setattr(ip);
1007 error = xfs_vn_change_ok(dentry, iattr);
1010 return xfs_setattr_size(ip, iattr);
1015 struct dentry *dentry,
1016 struct iattr *iattr)
1020 if (iattr->ia_valid & ATTR_SIZE) {
1021 struct inode *inode = d_inode(dentry);
1022 struct xfs_inode *ip = XFS_I(inode);
1025 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1026 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1028 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1030 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1034 error = xfs_vn_setattr_size(dentry, iattr);
1035 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1037 error = xfs_vn_setattr_nonsize(dentry, iattr);
1045 struct inode *inode,
1046 struct timespec64 *now,
1049 struct xfs_inode *ip = XFS_I(inode);
1050 struct xfs_mount *mp = ip->i_mount;
1051 int log_flags = XFS_ILOG_TIMESTAMP;
1052 struct xfs_trans *tp;
1055 trace_xfs_update_time(ip);
1057 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1058 if (!((flags & S_VERSION) &&
1059 inode_maybe_inc_iversion(inode, false)))
1060 return generic_update_time(inode, now, flags);
1062 /* Capture the iversion update that just occurred */
1063 log_flags |= XFS_ILOG_CORE;
1066 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1070 xfs_ilock(ip, XFS_ILOCK_EXCL);
1071 if (flags & S_CTIME)
1072 inode->i_ctime = *now;
1073 if (flags & S_MTIME)
1074 inode->i_mtime = *now;
1075 if (flags & S_ATIME)
1076 inode->i_atime = *now;
1078 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1079 xfs_trans_log_inode(tp, ip, log_flags);
1080 return xfs_trans_commit(tp);
1085 struct inode *inode,
1086 struct fiemap_extent_info *fieinfo,
1092 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1093 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1094 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1095 error = iomap_fiemap(inode, fieinfo, start, length,
1096 &xfs_xattr_iomap_ops);
1098 error = iomap_fiemap(inode, fieinfo, start, length,
1101 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1109 struct dentry *dentry,
1112 return xfs_generic_create(dir, dentry, mode, 0, true);
1115 static const struct inode_operations xfs_inode_operations = {
1116 .get_acl = xfs_get_acl,
1117 .set_acl = xfs_set_acl,
1118 .getattr = xfs_vn_getattr,
1119 .setattr = xfs_vn_setattr,
1120 .listxattr = xfs_vn_listxattr,
1121 .fiemap = xfs_vn_fiemap,
1122 .update_time = xfs_vn_update_time,
1125 static const struct inode_operations xfs_dir_inode_operations = {
1126 .create = xfs_vn_create,
1127 .lookup = xfs_vn_lookup,
1128 .link = xfs_vn_link,
1129 .unlink = xfs_vn_unlink,
1130 .symlink = xfs_vn_symlink,
1131 .mkdir = xfs_vn_mkdir,
1133 * Yes, XFS uses the same method for rmdir and unlink.
1135 * There are some subtile differences deeper in the code,
1136 * but we use S_ISDIR to check for those.
1138 .rmdir = xfs_vn_unlink,
1139 .mknod = xfs_vn_mknod,
1140 .rename = xfs_vn_rename,
1141 .get_acl = xfs_get_acl,
1142 .set_acl = xfs_set_acl,
1143 .getattr = xfs_vn_getattr,
1144 .setattr = xfs_vn_setattr,
1145 .listxattr = xfs_vn_listxattr,
1146 .update_time = xfs_vn_update_time,
1147 .tmpfile = xfs_vn_tmpfile,
1150 static const struct inode_operations xfs_dir_ci_inode_operations = {
1151 .create = xfs_vn_create,
1152 .lookup = xfs_vn_ci_lookup,
1153 .link = xfs_vn_link,
1154 .unlink = xfs_vn_unlink,
1155 .symlink = xfs_vn_symlink,
1156 .mkdir = xfs_vn_mkdir,
1158 * Yes, XFS uses the same method for rmdir and unlink.
1160 * There are some subtile differences deeper in the code,
1161 * but we use S_ISDIR to check for those.
1163 .rmdir = xfs_vn_unlink,
1164 .mknod = xfs_vn_mknod,
1165 .rename = xfs_vn_rename,
1166 .get_acl = xfs_get_acl,
1167 .set_acl = xfs_set_acl,
1168 .getattr = xfs_vn_getattr,
1169 .setattr = xfs_vn_setattr,
1170 .listxattr = xfs_vn_listxattr,
1171 .update_time = xfs_vn_update_time,
1172 .tmpfile = xfs_vn_tmpfile,
1175 static const struct inode_operations xfs_symlink_inode_operations = {
1176 .get_link = xfs_vn_get_link,
1177 .getattr = xfs_vn_getattr,
1178 .setattr = xfs_vn_setattr,
1179 .listxattr = xfs_vn_listxattr,
1180 .update_time = xfs_vn_update_time,
1183 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1184 .get_link = xfs_vn_get_link_inline,
1185 .getattr = xfs_vn_getattr,
1186 .setattr = xfs_vn_setattr,
1187 .listxattr = xfs_vn_listxattr,
1188 .update_time = xfs_vn_update_time,
1191 /* Figure out if this file actually supports DAX. */
1193 xfs_inode_supports_dax(
1194 struct xfs_inode *ip)
1196 struct xfs_mount *mp = ip->i_mount;
1198 /* Only supported on non-reflinked files. */
1199 if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
1202 /* DAX mount option or DAX iflag must be set. */
1203 if (!(mp->m_flags & XFS_MOUNT_DAX) &&
1204 !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1207 /* Block size must match page size */
1208 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1211 /* Device has to support DAX too. */
1212 return xfs_find_daxdev_for_inode(VFS_I(ip)) != NULL;
1216 xfs_diflags_to_iflags(
1217 struct inode *inode,
1218 struct xfs_inode *ip)
1220 uint16_t flags = ip->i_d.di_flags;
1222 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1225 if (flags & XFS_DIFLAG_IMMUTABLE)
1226 inode->i_flags |= S_IMMUTABLE;
1227 if (flags & XFS_DIFLAG_APPEND)
1228 inode->i_flags |= S_APPEND;
1229 if (flags & XFS_DIFLAG_SYNC)
1230 inode->i_flags |= S_SYNC;
1231 if (flags & XFS_DIFLAG_NOATIME)
1232 inode->i_flags |= S_NOATIME;
1233 if (xfs_inode_supports_dax(ip))
1234 inode->i_flags |= S_DAX;
1238 * Initialize the Linux inode.
1240 * When reading existing inodes from disk this is called directly from xfs_iget,
1241 * when creating a new inode it is called from xfs_ialloc after setting up the
1242 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1243 * it up to the caller to deal with unlocking the inode appropriately.
1247 struct xfs_inode *ip)
1249 struct inode *inode = &ip->i_vnode;
1252 inode->i_ino = ip->i_ino;
1253 inode->i_state = I_NEW;
1255 inode_sb_list_add(inode);
1256 /* make the inode look hashed for the writeback code */
1257 inode_fake_hash(inode);
1259 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1260 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1262 i_size_write(inode, ip->i_d.di_size);
1263 xfs_diflags_to_iflags(inode, ip);
1265 if (S_ISDIR(inode->i_mode)) {
1267 * We set the i_rwsem class here to avoid potential races with
1268 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1269 * after a filehandle lookup has already found the inode in
1270 * cache before it has been unlocked via unlock_new_inode().
1272 lockdep_set_class(&inode->i_rwsem,
1273 &inode->i_sb->s_type->i_mutex_dir_key);
1274 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1275 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1277 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1278 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1282 * Ensure all page cache allocations are done from GFP_NOFS context to
1283 * prevent direct reclaim recursion back into the filesystem and blowing
1284 * stacks or deadlocking.
1286 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1287 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1290 * If there is no attribute fork no ACL can exist on this inode,
1291 * and it can't have any file capabilities attached to it either.
1293 if (!XFS_IFORK_Q(ip)) {
1294 inode_has_no_xattr(inode);
1295 cache_no_acl(inode);
1301 struct xfs_inode *ip)
1303 struct inode *inode = &ip->i_vnode;
1305 switch (inode->i_mode & S_IFMT) {
1307 inode->i_op = &xfs_inode_operations;
1308 inode->i_fop = &xfs_file_operations;
1310 inode->i_mapping->a_ops = &xfs_dax_aops;
1312 inode->i_mapping->a_ops = &xfs_address_space_operations;
1315 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1316 inode->i_op = &xfs_dir_ci_inode_operations;
1318 inode->i_op = &xfs_dir_inode_operations;
1319 inode->i_fop = &xfs_dir_file_operations;
1322 if (ip->i_df.if_flags & XFS_IFINLINE)
1323 inode->i_op = &xfs_inline_symlink_inode_operations;
1325 inode->i_op = &xfs_symlink_inode_operations;
1328 inode->i_op = &xfs_inode_operations;
1329 init_special_inode(inode, inode->i_mode, inode->i_rdev);