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"
30 #include <linux/capability.h>
31 #include <linux/xattr.h>
32 #include <linux/posix_acl.h>
33 #include <linux/security.h>
34 #include <linux/iomap.h>
35 #include <linux/slab.h>
36 #include <linux/iversion.h>
39 * Directories have different lock order w.r.t. mmap_sem compared to regular
40 * files. This is due to readdir potentially triggering page faults on a user
41 * buffer inside filldir(), and this happens with the ilock on the directory
42 * held. For regular files, the lock order is the other way around - the
43 * mmap_sem is taken during the page fault, and then we lock the ilock to do
44 * block mapping. Hence we need a different class for the directory ilock so
45 * that lockdep can tell them apart.
47 static struct lock_class_key xfs_nondir_ilock_class;
48 static struct lock_class_key xfs_dir_ilock_class;
53 const struct xattr *xattr_array,
56 const struct xattr *xattr;
57 struct xfs_inode *ip = XFS_I(inode);
60 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
61 error = xfs_attr_set(ip, xattr->name, xattr->value,
62 xattr->value_len, ATTR_SECURE);
70 * Hook in SELinux. This is not quite correct yet, what we really need
71 * here (as we do for default ACLs) is a mechanism by which creation of
72 * these attrs can be journalled at inode creation time (along with the
73 * inode, of course, such that log replay can't cause these to be lost).
80 const struct qstr *qstr)
82 return security_inode_init_security(inode, dir, qstr,
83 &xfs_initxattrs, NULL);
88 struct xfs_name *namep,
89 struct dentry *dentry)
91 namep->name = dentry->d_name.name;
92 namep->len = dentry->d_name.len;
93 namep->type = XFS_DIR3_FT_UNKNOWN;
97 xfs_dentry_mode_to_name(
98 struct xfs_name *namep,
99 struct dentry *dentry,
102 namep->name = dentry->d_name.name;
103 namep->len = dentry->d_name.len;
104 namep->type = xfs_mode_to_ftype(mode);
106 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
107 return -EFSCORRUPTED;
116 struct dentry *dentry)
118 struct xfs_name teardown;
121 * If we can't add the ACL or we fail in
122 * xfs_init_security we must back out.
123 * ENOSPC can hit here, among other things.
125 xfs_dentry_to_name(&teardown, dentry);
127 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
133 struct dentry *dentry,
136 bool tmpfile) /* unnamed file */
139 struct xfs_inode *ip = NULL;
140 struct posix_acl *default_acl, *acl;
141 struct xfs_name name;
145 * Irix uses Missed'em'V split, but doesn't want to see
146 * the upper 5 bits of (14bit) major.
148 if (S_ISCHR(mode) || S_ISBLK(mode)) {
149 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
155 error = posix_acl_create(dir, &mode, &default_acl, &acl);
159 /* Verify mode is valid also for tmpfile case */
160 error = xfs_dentry_mode_to_name(&name, dentry, mode);
165 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
167 error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
174 error = xfs_init_security(inode, dir, &dentry->d_name);
176 goto out_cleanup_inode;
178 #ifdef CONFIG_XFS_POSIX_ACL
180 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
182 goto out_cleanup_inode;
185 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
187 goto out_cleanup_inode;
194 d_tmpfile(dentry, inode);
196 d_instantiate(dentry, inode);
198 xfs_finish_inode_setup(ip);
202 posix_acl_release(default_acl);
204 posix_acl_release(acl);
208 xfs_finish_inode_setup(ip);
210 xfs_cleanup_inode(dir, inode, dentry);
218 struct dentry *dentry,
222 return xfs_generic_create(dir, dentry, mode, rdev, false);
228 struct dentry *dentry,
232 return xfs_vn_mknod(dir, dentry, mode, 0);
238 struct dentry *dentry,
241 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
244 STATIC struct dentry *
247 struct dentry *dentry,
251 struct xfs_inode *cip;
252 struct xfs_name name;
255 if (dentry->d_name.len >= MAXNAMELEN)
256 return ERR_PTR(-ENAMETOOLONG);
258 xfs_dentry_to_name(&name, dentry);
259 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
262 else if (likely(error == -ENOENT))
265 inode = ERR_PTR(error);
266 return d_splice_alias(inode, dentry);
269 STATIC struct dentry *
272 struct dentry *dentry,
275 struct xfs_inode *ip;
276 struct xfs_name xname;
277 struct xfs_name ci_name;
281 if (dentry->d_name.len >= MAXNAMELEN)
282 return ERR_PTR(-ENAMETOOLONG);
284 xfs_dentry_to_name(&xname, dentry);
285 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
286 if (unlikely(error)) {
287 if (unlikely(error != -ENOENT))
288 return ERR_PTR(error);
290 * call d_add(dentry, NULL) here when d_drop_negative_children
291 * is called in xfs_vn_mknod (ie. allow negative dentries
292 * with CI filesystems).
297 /* if exact match, just splice and exit */
299 return d_splice_alias(VFS_I(ip), dentry);
301 /* else case-insensitive match... */
302 dname.name = ci_name.name;
303 dname.len = ci_name.len;
304 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
305 kmem_free(ci_name.name);
311 struct dentry *old_dentry,
313 struct dentry *dentry)
315 struct inode *inode = d_inode(old_dentry);
316 struct xfs_name name;
319 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
323 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
328 d_instantiate(dentry, inode);
335 struct dentry *dentry)
337 struct xfs_name name;
340 xfs_dentry_to_name(&name, dentry);
342 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
347 * With unlink, the VFS makes the dentry "negative": no inode,
348 * but still hashed. This is incompatible with case-insensitive
349 * mode, so invalidate (unhash) the dentry in CI-mode.
351 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
352 d_invalidate(dentry);
359 struct dentry *dentry,
363 struct xfs_inode *cip = NULL;
364 struct xfs_name name;
369 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
370 error = xfs_dentry_mode_to_name(&name, dentry, mode);
374 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
380 error = xfs_init_security(inode, dir, &dentry->d_name);
382 goto out_cleanup_inode;
386 d_instantiate(dentry, inode);
387 xfs_finish_inode_setup(cip);
391 xfs_finish_inode_setup(cip);
392 xfs_cleanup_inode(dir, inode, dentry);
401 struct dentry *odentry,
403 struct dentry *ndentry,
406 struct inode *new_inode = d_inode(ndentry);
409 struct xfs_name oname;
410 struct xfs_name nname;
412 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
415 /* if we are exchanging files, we need to set i_mode of both files */
416 if (flags & RENAME_EXCHANGE)
417 omode = d_inode(ndentry)->i_mode;
419 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
420 if (omode && unlikely(error))
423 error = xfs_dentry_mode_to_name(&nname, ndentry,
424 d_inode(odentry)->i_mode);
428 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
430 new_inode ? XFS_I(new_inode) : NULL, flags);
434 * careful here - this function can get called recursively, so
435 * we need to be very careful about how much stack we use.
436 * uio is kmalloced for this reason...
440 struct dentry *dentry,
442 struct delayed_call *done)
448 return ERR_PTR(-ECHILD);
450 link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
454 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
458 set_delayed_call(done, kfree_link, link);
464 return ERR_PTR(error);
468 xfs_vn_get_link_inline(
469 struct dentry *dentry,
471 struct delayed_call *done)
473 ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
474 return XFS_I(inode)->i_df.if_u1.if_data;
479 const struct path *path,
482 unsigned int query_flags)
484 struct inode *inode = d_inode(path->dentry);
485 struct xfs_inode *ip = XFS_I(inode);
486 struct xfs_mount *mp = ip->i_mount;
488 trace_xfs_getattr(ip);
490 if (XFS_FORCED_SHUTDOWN(mp))
493 stat->size = XFS_ISIZE(ip);
494 stat->dev = inode->i_sb->s_dev;
495 stat->mode = inode->i_mode;
496 stat->nlink = inode->i_nlink;
497 stat->uid = inode->i_uid;
498 stat->gid = inode->i_gid;
499 stat->ino = ip->i_ino;
500 stat->atime = inode->i_atime;
501 stat->mtime = inode->i_mtime;
502 stat->ctime = inode->i_ctime;
504 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
506 if (ip->i_d.di_version == 3) {
507 if (request_mask & STATX_BTIME) {
508 stat->result_mask |= STATX_BTIME;
509 stat->btime.tv_sec = ip->i_d.di_crtime.t_sec;
510 stat->btime.tv_nsec = ip->i_d.di_crtime.t_nsec;
514 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
515 stat->attributes |= STATX_ATTR_IMMUTABLE;
516 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
517 stat->attributes |= STATX_ATTR_APPEND;
518 if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
519 stat->attributes |= STATX_ATTR_NODUMP;
521 switch (inode->i_mode & S_IFMT) {
524 stat->blksize = BLKDEV_IOSIZE;
525 stat->rdev = inode->i_rdev;
528 if (XFS_IS_REALTIME_INODE(ip)) {
530 * If the file blocks are being allocated from a
531 * realtime volume, then return the inode's realtime
532 * extent size or the realtime volume's extent size.
535 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
537 stat->blksize = xfs_preferred_iosize(mp);
547 struct xfs_inode *ip,
550 struct inode *inode = VFS_I(ip);
551 umode_t mode = iattr->ia_mode;
553 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
555 inode->i_mode &= S_IFMT;
556 inode->i_mode |= mode & ~S_IFMT;
561 struct xfs_inode *ip,
564 struct inode *inode = VFS_I(ip);
566 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
568 if (iattr->ia_valid & ATTR_ATIME)
569 inode->i_atime = iattr->ia_atime;
570 if (iattr->ia_valid & ATTR_CTIME)
571 inode->i_ctime = iattr->ia_ctime;
572 if (iattr->ia_valid & ATTR_MTIME)
573 inode->i_mtime = iattr->ia_mtime;
578 struct dentry *dentry,
581 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
583 if (mp->m_flags & XFS_MOUNT_RDONLY)
586 if (XFS_FORCED_SHUTDOWN(mp))
589 return setattr_prepare(dentry, iattr);
593 * Set non-size attributes of an inode.
595 * Caution: The caller of this function is responsible for calling
596 * setattr_prepare() or otherwise verifying the change is fine.
600 struct xfs_inode *ip,
604 xfs_mount_t *mp = ip->i_mount;
605 struct inode *inode = VFS_I(ip);
606 int mask = iattr->ia_valid;
609 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
610 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
611 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
612 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
614 ASSERT((mask & ATTR_SIZE) == 0);
617 * If disk quotas is on, we make sure that the dquots do exist on disk,
618 * before we start any other transactions. Trying to do this later
619 * is messy. We don't care to take a readlock to look at the ids
620 * in inode here, because we can't hold it across the trans_reserve.
621 * If the IDs do change before we take the ilock, we're covered
622 * because the i_*dquot fields will get updated anyway.
624 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
627 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
629 qflags |= XFS_QMOPT_UQUOTA;
633 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
635 qflags |= XFS_QMOPT_GQUOTA;
641 * We take a reference when we initialize udqp and gdqp,
642 * so it is important that we never blindly double trip on
643 * the same variable. See xfs_create() for an example.
645 ASSERT(udqp == NULL);
646 ASSERT(gdqp == NULL);
647 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
648 xfs_kgid_to_gid(gid),
650 qflags, &udqp, &gdqp, NULL);
655 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
659 xfs_ilock(ip, XFS_ILOCK_EXCL);
660 xfs_trans_ijoin(tp, ip, 0);
663 * Change file ownership. Must be the owner or privileged.
665 if (mask & (ATTR_UID|ATTR_GID)) {
667 * These IDs could have changed since we last looked at them.
668 * But, we're assured that if the ownership did change
669 * while we didn't have the inode locked, inode's dquot(s)
670 * would have changed also.
674 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
675 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
678 * Do a quota reservation only if uid/gid is actually
681 if (XFS_IS_QUOTA_RUNNING(mp) &&
682 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
683 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
685 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
686 NULL, capable(CAP_FOWNER) ?
687 XFS_QMOPT_FORCE_RES : 0);
688 if (error) /* out of quota */
694 * Change file ownership. Must be the owner or privileged.
696 if (mask & (ATTR_UID|ATTR_GID)) {
698 * CAP_FSETID overrides the following restrictions:
700 * The set-user-ID and set-group-ID bits of a file will be
701 * cleared upon successful return from chown()
703 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
704 !capable(CAP_FSETID))
705 inode->i_mode &= ~(S_ISUID|S_ISGID);
708 * Change the ownerships and register quota modifications
709 * in the transaction.
711 if (!uid_eq(iuid, uid)) {
712 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
713 ASSERT(mask & ATTR_UID);
715 olddquot1 = xfs_qm_vop_chown(tp, ip,
716 &ip->i_udquot, udqp);
718 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
721 if (!gid_eq(igid, gid)) {
722 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
723 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
724 !XFS_IS_PQUOTA_ON(mp));
725 ASSERT(mask & ATTR_GID);
727 olddquot2 = xfs_qm_vop_chown(tp, ip,
728 &ip->i_gdquot, gdqp);
730 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
735 if (mask & ATTR_MODE)
736 xfs_setattr_mode(ip, iattr);
737 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
738 xfs_setattr_time(ip, iattr);
740 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
742 XFS_STATS_INC(mp, xs_ig_attrchg);
744 if (mp->m_flags & XFS_MOUNT_WSYNC)
745 xfs_trans_set_sync(tp);
746 error = xfs_trans_commit(tp);
748 xfs_iunlock(ip, XFS_ILOCK_EXCL);
751 * Release any dquot(s) the inode had kept before chown.
753 xfs_qm_dqrele(olddquot1);
754 xfs_qm_dqrele(olddquot2);
762 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
763 * update. We could avoid this with linked transactions
764 * and passing down the transaction pointer all the way
765 * to attr_set. No previous user of the generic
766 * Posix ACL code seems to care about this issue either.
768 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
769 error = posix_acl_chmod(inode, inode->i_mode);
777 xfs_trans_cancel(tp);
785 xfs_vn_setattr_nonsize(
786 struct dentry *dentry,
789 struct xfs_inode *ip = XFS_I(d_inode(dentry));
792 trace_xfs_setattr(ip);
794 error = xfs_vn_change_ok(dentry, iattr);
797 return xfs_setattr_nonsize(ip, iattr, 0);
801 * Truncate file. Must have write permission and not be a directory.
803 * Caution: The caller of this function is responsible for calling
804 * setattr_prepare() or otherwise verifying the change is fine.
808 struct xfs_inode *ip,
811 struct xfs_mount *mp = ip->i_mount;
812 struct inode *inode = VFS_I(ip);
813 xfs_off_t oldsize, newsize;
814 struct xfs_trans *tp;
817 bool did_zeroing = false;
819 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
820 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
821 ASSERT(S_ISREG(inode->i_mode));
822 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
823 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
825 oldsize = inode->i_size;
826 newsize = iattr->ia_size;
829 * Short circuit the truncate case for zero length files.
831 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
832 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
836 * Use the regular setattr path to update the timestamps.
838 iattr->ia_valid &= ~ATTR_SIZE;
839 return xfs_setattr_nonsize(ip, iattr, 0);
843 * Make sure that the dquots are attached to the inode.
845 error = xfs_qm_dqattach(ip);
850 * Wait for all direct I/O to complete.
852 inode_dio_wait(inode);
855 * File data changes must be complete before we start the transaction to
856 * modify the inode. This needs to be done before joining the inode to
857 * the transaction because the inode cannot be unlocked once it is a
858 * part of the transaction.
860 * Start with zeroing any data beyond EOF that we may expose on file
861 * extension, or zeroing out the rest of the block on a downward
864 if (newsize > oldsize) {
865 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
866 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
867 &did_zeroing, &xfs_iomap_ops);
869 error = iomap_truncate_page(inode, newsize, &did_zeroing,
877 * We've already locked out new page faults, so now we can safely remove
878 * pages from the page cache knowing they won't get refaulted until we
879 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
880 * complete. The truncate_setsize() call also cleans partial EOF page
881 * PTEs on extending truncates and hence ensures sub-page block size
882 * filesystems are correctly handled, too.
884 * We have to do all the page cache truncate work outside the
885 * transaction context as the "lock" order is page lock->log space
886 * reservation as defined by extent allocation in the writeback path.
887 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
888 * having already truncated the in-memory version of the file (i.e. made
889 * user visible changes). There's not much we can do about this, except
890 * to hope that the caller sees ENOMEM and retries the truncate
893 * And we update in-core i_size and truncate page cache beyond newsize
894 * before writeback the [di_size, newsize] range, so we're guaranteed
895 * not to write stale data past the new EOF on truncate down.
897 truncate_setsize(inode, newsize);
900 * We are going to log the inode size change in this transaction so
901 * any previous writes that are beyond the on disk EOF and the new
902 * EOF that have not been written out need to be written here. If we
903 * do not write the data out, we expose ourselves to the null files
904 * problem. Note that this includes any block zeroing we did above;
905 * otherwise those blocks may not be zeroed after a crash.
908 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
909 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
910 ip->i_d.di_size, newsize - 1);
915 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
919 lock_flags |= XFS_ILOCK_EXCL;
920 xfs_ilock(ip, XFS_ILOCK_EXCL);
921 xfs_trans_ijoin(tp, ip, 0);
924 * Only change the c/mtime if we are changing the size or we are
925 * explicitly asked to change it. This handles the semantic difference
926 * between truncate() and ftruncate() as implemented in the VFS.
928 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
929 * special case where we need to update the times despite not having
930 * these flags set. For all other operations the VFS set these flags
931 * explicitly if it wants a timestamp update.
933 if (newsize != oldsize &&
934 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
935 iattr->ia_ctime = iattr->ia_mtime =
937 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
941 * The first thing we do is set the size to new_size permanently on
942 * disk. This way we don't have to worry about anyone ever being able
943 * to look at the data being freed even in the face of a crash.
944 * What we're getting around here is the case where we free a block, it
945 * is allocated to another file, it is written to, and then we crash.
946 * If the new data gets written to the file but the log buffers
947 * containing the free and reallocation don't, then we'd end up with
948 * garbage in the blocks being freed. As long as we make the new size
949 * permanent before actually freeing any blocks it doesn't matter if
950 * they get written to.
952 ip->i_d.di_size = newsize;
953 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
955 if (newsize <= oldsize) {
956 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
958 goto out_trans_cancel;
961 * Truncated "down", so we're removing references to old data
962 * here - if we delay flushing for a long time, we expose
963 * ourselves unduly to the notorious NULL files problem. So,
964 * we mark this inode and flush it when the file is closed,
965 * and do not wait the usual (long) time for writeout.
967 xfs_iflags_set(ip, XFS_ITRUNCATED);
969 /* A truncate down always removes post-EOF blocks. */
970 xfs_inode_clear_eofblocks_tag(ip);
973 if (iattr->ia_valid & ATTR_MODE)
974 xfs_setattr_mode(ip, iattr);
975 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
976 xfs_setattr_time(ip, iattr);
978 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
980 XFS_STATS_INC(mp, xs_ig_attrchg);
982 if (mp->m_flags & XFS_MOUNT_WSYNC)
983 xfs_trans_set_sync(tp);
985 error = xfs_trans_commit(tp);
988 xfs_iunlock(ip, lock_flags);
992 xfs_trans_cancel(tp);
998 struct dentry *dentry,
1001 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1004 trace_xfs_setattr(ip);
1006 error = xfs_vn_change_ok(dentry, iattr);
1009 return xfs_setattr_size(ip, iattr);
1014 struct dentry *dentry,
1015 struct iattr *iattr)
1019 if (iattr->ia_valid & ATTR_SIZE) {
1020 struct inode *inode = d_inode(dentry);
1021 struct xfs_inode *ip = XFS_I(inode);
1024 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1025 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1027 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1029 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1033 error = xfs_vn_setattr_size(dentry, iattr);
1034 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1036 error = xfs_vn_setattr_nonsize(dentry, iattr);
1044 struct inode *inode,
1045 struct timespec64 *now,
1048 struct xfs_inode *ip = XFS_I(inode);
1049 struct xfs_mount *mp = ip->i_mount;
1050 int log_flags = XFS_ILOG_TIMESTAMP;
1051 struct xfs_trans *tp;
1054 trace_xfs_update_time(ip);
1056 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1057 if (!((flags & S_VERSION) &&
1058 inode_maybe_inc_iversion(inode, false)))
1059 return generic_update_time(inode, now, flags);
1061 /* Capture the iversion update that just occurred */
1062 log_flags |= XFS_ILOG_CORE;
1065 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1069 xfs_ilock(ip, XFS_ILOCK_EXCL);
1070 if (flags & S_CTIME)
1071 inode->i_ctime = *now;
1072 if (flags & S_MTIME)
1073 inode->i_mtime = *now;
1074 if (flags & S_ATIME)
1075 inode->i_atime = *now;
1077 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1078 xfs_trans_log_inode(tp, ip, log_flags);
1079 return xfs_trans_commit(tp);
1084 struct inode *inode,
1085 struct fiemap_extent_info *fieinfo,
1091 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1092 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1093 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1094 error = iomap_fiemap(inode, fieinfo, start, length,
1095 &xfs_xattr_iomap_ops);
1097 error = iomap_fiemap(inode, fieinfo, start, length,
1100 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1108 struct dentry *dentry,
1111 return xfs_generic_create(dir, dentry, mode, 0, true);
1114 static const struct inode_operations xfs_inode_operations = {
1115 .get_acl = xfs_get_acl,
1116 .set_acl = xfs_set_acl,
1117 .getattr = xfs_vn_getattr,
1118 .setattr = xfs_vn_setattr,
1119 .listxattr = xfs_vn_listxattr,
1120 .fiemap = xfs_vn_fiemap,
1121 .update_time = xfs_vn_update_time,
1124 static const struct inode_operations xfs_dir_inode_operations = {
1125 .create = xfs_vn_create,
1126 .lookup = xfs_vn_lookup,
1127 .link = xfs_vn_link,
1128 .unlink = xfs_vn_unlink,
1129 .symlink = xfs_vn_symlink,
1130 .mkdir = xfs_vn_mkdir,
1132 * Yes, XFS uses the same method for rmdir and unlink.
1134 * There are some subtile differences deeper in the code,
1135 * but we use S_ISDIR to check for those.
1137 .rmdir = xfs_vn_unlink,
1138 .mknod = xfs_vn_mknod,
1139 .rename = xfs_vn_rename,
1140 .get_acl = xfs_get_acl,
1141 .set_acl = xfs_set_acl,
1142 .getattr = xfs_vn_getattr,
1143 .setattr = xfs_vn_setattr,
1144 .listxattr = xfs_vn_listxattr,
1145 .update_time = xfs_vn_update_time,
1146 .tmpfile = xfs_vn_tmpfile,
1149 static const struct inode_operations xfs_dir_ci_inode_operations = {
1150 .create = xfs_vn_create,
1151 .lookup = xfs_vn_ci_lookup,
1152 .link = xfs_vn_link,
1153 .unlink = xfs_vn_unlink,
1154 .symlink = xfs_vn_symlink,
1155 .mkdir = xfs_vn_mkdir,
1157 * Yes, XFS uses the same method for rmdir and unlink.
1159 * There are some subtile differences deeper in the code,
1160 * but we use S_ISDIR to check for those.
1162 .rmdir = xfs_vn_unlink,
1163 .mknod = xfs_vn_mknod,
1164 .rename = xfs_vn_rename,
1165 .get_acl = xfs_get_acl,
1166 .set_acl = xfs_set_acl,
1167 .getattr = xfs_vn_getattr,
1168 .setattr = xfs_vn_setattr,
1169 .listxattr = xfs_vn_listxattr,
1170 .update_time = xfs_vn_update_time,
1171 .tmpfile = xfs_vn_tmpfile,
1174 static const struct inode_operations xfs_symlink_inode_operations = {
1175 .get_link = xfs_vn_get_link,
1176 .getattr = xfs_vn_getattr,
1177 .setattr = xfs_vn_setattr,
1178 .listxattr = xfs_vn_listxattr,
1179 .update_time = xfs_vn_update_time,
1182 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1183 .get_link = xfs_vn_get_link_inline,
1184 .getattr = xfs_vn_getattr,
1185 .setattr = xfs_vn_setattr,
1186 .listxattr = xfs_vn_listxattr,
1187 .update_time = xfs_vn_update_time,
1190 /* Figure out if this file actually supports DAX. */
1192 xfs_inode_supports_dax(
1193 struct xfs_inode *ip)
1195 struct xfs_mount *mp = ip->i_mount;
1197 /* Only supported on non-reflinked files. */
1198 if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
1201 /* DAX mount option or DAX iflag must be set. */
1202 if (!(mp->m_flags & XFS_MOUNT_DAX) &&
1203 !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1206 /* Block size must match page size */
1207 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1210 /* Device has to support DAX too. */
1211 return xfs_find_daxdev_for_inode(VFS_I(ip)) != NULL;
1215 xfs_diflags_to_iflags(
1216 struct inode *inode,
1217 struct xfs_inode *ip)
1219 uint16_t flags = ip->i_d.di_flags;
1221 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1224 if (flags & XFS_DIFLAG_IMMUTABLE)
1225 inode->i_flags |= S_IMMUTABLE;
1226 if (flags & XFS_DIFLAG_APPEND)
1227 inode->i_flags |= S_APPEND;
1228 if (flags & XFS_DIFLAG_SYNC)
1229 inode->i_flags |= S_SYNC;
1230 if (flags & XFS_DIFLAG_NOATIME)
1231 inode->i_flags |= S_NOATIME;
1232 if (xfs_inode_supports_dax(ip))
1233 inode->i_flags |= S_DAX;
1237 * Initialize the Linux inode.
1239 * When reading existing inodes from disk this is called directly from xfs_iget,
1240 * when creating a new inode it is called from xfs_ialloc after setting up the
1241 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1242 * it up to the caller to deal with unlocking the inode appropriately.
1246 struct xfs_inode *ip)
1248 struct inode *inode = &ip->i_vnode;
1251 inode->i_ino = ip->i_ino;
1252 inode->i_state = I_NEW;
1254 inode_sb_list_add(inode);
1255 /* make the inode look hashed for the writeback code */
1256 hlist_add_fake(&inode->i_hash);
1258 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1259 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1261 i_size_write(inode, ip->i_d.di_size);
1262 xfs_diflags_to_iflags(inode, ip);
1264 if (S_ISDIR(inode->i_mode)) {
1266 * We set the i_rwsem class here to avoid potential races with
1267 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1268 * after a filehandle lookup has already found the inode in
1269 * cache before it has been unlocked via unlock_new_inode().
1271 lockdep_set_class(&inode->i_rwsem,
1272 &inode->i_sb->s_type->i_mutex_dir_key);
1273 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1274 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1276 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1277 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1281 * Ensure all page cache allocations are done from GFP_NOFS context to
1282 * prevent direct reclaim recursion back into the filesystem and blowing
1283 * stacks or deadlocking.
1285 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1286 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1289 * If there is no attribute fork no ACL can exist on this inode,
1290 * and it can't have any file capabilities attached to it either.
1292 if (!XFS_IFORK_Q(ip)) {
1293 inode_has_no_xattr(inode);
1294 cache_no_acl(inode);
1300 struct xfs_inode *ip)
1302 struct inode *inode = &ip->i_vnode;
1304 switch (inode->i_mode & S_IFMT) {
1306 inode->i_op = &xfs_inode_operations;
1307 inode->i_fop = &xfs_file_operations;
1309 inode->i_mapping->a_ops = &xfs_dax_aops;
1311 inode->i_mapping->a_ops = &xfs_address_space_operations;
1314 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1315 inode->i_op = &xfs_dir_ci_inode_operations;
1317 inode->i_op = &xfs_dir_inode_operations;
1318 inode->i_fop = &xfs_dir_file_operations;
1321 if (ip->i_df.if_flags & XFS_IFINLINE)
1322 inode->i_op = &xfs_inline_symlink_inode_operations;
1324 inode->i_op = &xfs_symlink_inode_operations;
1327 inode->i_op = &xfs_inode_operations;
1328 init_special_inode(inode, inode->i_mode, inode->i_rdev);