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;
196 * The VFS requires that any inode fed to d_tmpfile must have
197 * nlink == 1 so that it can decrement the nlink in d_tmpfile.
198 * However, we created the temp file with nlink == 0 because
199 * we're not allowed to put an inode with nlink > 0 on the
200 * unlinked list. Therefore we have to set nlink to 1 so that
201 * d_tmpfile can immediately set it back to zero.
204 d_tmpfile(dentry, inode);
206 d_instantiate(dentry, inode);
208 xfs_finish_inode_setup(ip);
212 posix_acl_release(default_acl);
214 posix_acl_release(acl);
218 xfs_finish_inode_setup(ip);
220 xfs_cleanup_inode(dir, inode, dentry);
228 struct dentry *dentry,
232 return xfs_generic_create(dir, dentry, mode, rdev, false);
238 struct dentry *dentry,
242 return xfs_vn_mknod(dir, dentry, mode, 0);
248 struct dentry *dentry,
251 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
254 STATIC struct dentry *
257 struct dentry *dentry,
261 struct xfs_inode *cip;
262 struct xfs_name name;
265 if (dentry->d_name.len >= MAXNAMELEN)
266 return ERR_PTR(-ENAMETOOLONG);
268 xfs_dentry_to_name(&name, dentry);
269 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
272 else if (likely(error == -ENOENT))
275 inode = ERR_PTR(error);
276 return d_splice_alias(inode, dentry);
279 STATIC struct dentry *
282 struct dentry *dentry,
285 struct xfs_inode *ip;
286 struct xfs_name xname;
287 struct xfs_name ci_name;
291 if (dentry->d_name.len >= MAXNAMELEN)
292 return ERR_PTR(-ENAMETOOLONG);
294 xfs_dentry_to_name(&xname, dentry);
295 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
296 if (unlikely(error)) {
297 if (unlikely(error != -ENOENT))
298 return ERR_PTR(error);
300 * call d_add(dentry, NULL) here when d_drop_negative_children
301 * is called in xfs_vn_mknod (ie. allow negative dentries
302 * with CI filesystems).
307 /* if exact match, just splice and exit */
309 return d_splice_alias(VFS_I(ip), dentry);
311 /* else case-insensitive match... */
312 dname.name = ci_name.name;
313 dname.len = ci_name.len;
314 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
315 kmem_free(ci_name.name);
321 struct dentry *old_dentry,
323 struct dentry *dentry)
325 struct inode *inode = d_inode(old_dentry);
326 struct xfs_name name;
329 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
333 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
338 d_instantiate(dentry, inode);
345 struct dentry *dentry)
347 struct xfs_name name;
350 xfs_dentry_to_name(&name, dentry);
352 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
357 * With unlink, the VFS makes the dentry "negative": no inode,
358 * but still hashed. This is incompatible with case-insensitive
359 * mode, so invalidate (unhash) the dentry in CI-mode.
361 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
362 d_invalidate(dentry);
369 struct dentry *dentry,
373 struct xfs_inode *cip = NULL;
374 struct xfs_name name;
379 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
380 error = xfs_dentry_mode_to_name(&name, dentry, mode);
384 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
390 error = xfs_init_security(inode, dir, &dentry->d_name);
392 goto out_cleanup_inode;
396 d_instantiate(dentry, inode);
397 xfs_finish_inode_setup(cip);
401 xfs_finish_inode_setup(cip);
402 xfs_cleanup_inode(dir, inode, dentry);
411 struct dentry *odentry,
413 struct dentry *ndentry,
416 struct inode *new_inode = d_inode(ndentry);
419 struct xfs_name oname;
420 struct xfs_name nname;
422 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
425 /* if we are exchanging files, we need to set i_mode of both files */
426 if (flags & RENAME_EXCHANGE)
427 omode = d_inode(ndentry)->i_mode;
429 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
430 if (omode && unlikely(error))
433 error = xfs_dentry_mode_to_name(&nname, ndentry,
434 d_inode(odentry)->i_mode);
438 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
440 new_inode ? XFS_I(new_inode) : NULL, flags);
444 * careful here - this function can get called recursively, so
445 * we need to be very careful about how much stack we use.
446 * uio is kmalloced for this reason...
450 struct dentry *dentry,
452 struct delayed_call *done)
458 return ERR_PTR(-ECHILD);
460 link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
464 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
468 set_delayed_call(done, kfree_link, link);
474 return ERR_PTR(error);
478 xfs_vn_get_link_inline(
479 struct dentry *dentry,
481 struct delayed_call *done)
485 ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
488 * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
491 link = XFS_I(inode)->i_df.if_u1.if_data;
493 return ERR_PTR(-EFSCORRUPTED);
499 const struct path *path,
502 unsigned int query_flags)
504 struct inode *inode = d_inode(path->dentry);
505 struct xfs_inode *ip = XFS_I(inode);
506 struct xfs_mount *mp = ip->i_mount;
508 trace_xfs_getattr(ip);
510 if (XFS_FORCED_SHUTDOWN(mp))
513 stat->size = XFS_ISIZE(ip);
514 stat->dev = inode->i_sb->s_dev;
515 stat->mode = inode->i_mode;
516 stat->nlink = inode->i_nlink;
517 stat->uid = inode->i_uid;
518 stat->gid = inode->i_gid;
519 stat->ino = ip->i_ino;
520 stat->atime = inode->i_atime;
521 stat->mtime = inode->i_mtime;
522 stat->ctime = inode->i_ctime;
524 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
526 if (ip->i_d.di_version == 3) {
527 if (request_mask & STATX_BTIME) {
528 stat->result_mask |= STATX_BTIME;
529 stat->btime.tv_sec = ip->i_d.di_crtime.t_sec;
530 stat->btime.tv_nsec = ip->i_d.di_crtime.t_nsec;
535 * Note: If you add another clause to set an attribute flag, please
536 * update attributes_mask below.
538 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
539 stat->attributes |= STATX_ATTR_IMMUTABLE;
540 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
541 stat->attributes |= STATX_ATTR_APPEND;
542 if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
543 stat->attributes |= STATX_ATTR_NODUMP;
545 stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
549 switch (inode->i_mode & S_IFMT) {
552 stat->blksize = BLKDEV_IOSIZE;
553 stat->rdev = inode->i_rdev;
556 if (XFS_IS_REALTIME_INODE(ip)) {
558 * If the file blocks are being allocated from a
559 * realtime volume, then return the inode's realtime
560 * extent size or the realtime volume's extent size.
563 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
565 stat->blksize = xfs_preferred_iosize(mp);
575 struct xfs_inode *ip,
578 struct inode *inode = VFS_I(ip);
579 umode_t mode = iattr->ia_mode;
581 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
583 inode->i_mode &= S_IFMT;
584 inode->i_mode |= mode & ~S_IFMT;
589 struct xfs_inode *ip,
592 struct inode *inode = VFS_I(ip);
594 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
596 if (iattr->ia_valid & ATTR_ATIME)
597 inode->i_atime = iattr->ia_atime;
598 if (iattr->ia_valid & ATTR_CTIME)
599 inode->i_ctime = iattr->ia_ctime;
600 if (iattr->ia_valid & ATTR_MTIME)
601 inode->i_mtime = iattr->ia_mtime;
606 struct dentry *dentry,
609 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
611 if (mp->m_flags & XFS_MOUNT_RDONLY)
614 if (XFS_FORCED_SHUTDOWN(mp))
617 return setattr_prepare(dentry, iattr);
621 * Set non-size attributes of an inode.
623 * Caution: The caller of this function is responsible for calling
624 * setattr_prepare() or otherwise verifying the change is fine.
628 struct xfs_inode *ip,
632 xfs_mount_t *mp = ip->i_mount;
633 struct inode *inode = VFS_I(ip);
634 int mask = iattr->ia_valid;
637 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
638 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
639 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
640 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
642 ASSERT((mask & ATTR_SIZE) == 0);
645 * If disk quotas is on, we make sure that the dquots do exist on disk,
646 * before we start any other transactions. Trying to do this later
647 * is messy. We don't care to take a readlock to look at the ids
648 * in inode here, because we can't hold it across the trans_reserve.
649 * If the IDs do change before we take the ilock, we're covered
650 * because the i_*dquot fields will get updated anyway.
652 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
655 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
657 qflags |= XFS_QMOPT_UQUOTA;
661 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
663 qflags |= XFS_QMOPT_GQUOTA;
669 * We take a reference when we initialize udqp and gdqp,
670 * so it is important that we never blindly double trip on
671 * the same variable. See xfs_create() for an example.
673 ASSERT(udqp == NULL);
674 ASSERT(gdqp == NULL);
675 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
676 xfs_kgid_to_gid(gid),
678 qflags, &udqp, &gdqp, NULL);
683 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
687 xfs_ilock(ip, XFS_ILOCK_EXCL);
688 xfs_trans_ijoin(tp, ip, 0);
691 * Change file ownership. Must be the owner or privileged.
693 if (mask & (ATTR_UID|ATTR_GID)) {
695 * These IDs could have changed since we last looked at them.
696 * But, we're assured that if the ownership did change
697 * while we didn't have the inode locked, inode's dquot(s)
698 * would have changed also.
702 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
703 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
706 * Do a quota reservation only if uid/gid is actually
709 if (XFS_IS_QUOTA_RUNNING(mp) &&
710 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
711 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
713 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
714 NULL, capable(CAP_FOWNER) ?
715 XFS_QMOPT_FORCE_RES : 0);
716 if (error) /* out of quota */
722 * Change file ownership. Must be the owner or privileged.
724 if (mask & (ATTR_UID|ATTR_GID)) {
726 * CAP_FSETID overrides the following restrictions:
728 * The set-user-ID and set-group-ID bits of a file will be
729 * cleared upon successful return from chown()
731 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
732 !capable(CAP_FSETID))
733 inode->i_mode &= ~(S_ISUID|S_ISGID);
736 * Change the ownerships and register quota modifications
737 * in the transaction.
739 if (!uid_eq(iuid, uid)) {
740 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
741 ASSERT(mask & ATTR_UID);
743 olddquot1 = xfs_qm_vop_chown(tp, ip,
744 &ip->i_udquot, udqp);
746 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
749 if (!gid_eq(igid, gid)) {
750 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
751 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
752 !XFS_IS_PQUOTA_ON(mp));
753 ASSERT(mask & ATTR_GID);
755 olddquot2 = xfs_qm_vop_chown(tp, ip,
756 &ip->i_gdquot, gdqp);
758 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
763 if (mask & ATTR_MODE)
764 xfs_setattr_mode(ip, iattr);
765 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
766 xfs_setattr_time(ip, iattr);
768 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
770 XFS_STATS_INC(mp, xs_ig_attrchg);
772 if (mp->m_flags & XFS_MOUNT_WSYNC)
773 xfs_trans_set_sync(tp);
774 error = xfs_trans_commit(tp);
776 xfs_iunlock(ip, XFS_ILOCK_EXCL);
779 * Release any dquot(s) the inode had kept before chown.
781 xfs_qm_dqrele(olddquot1);
782 xfs_qm_dqrele(olddquot2);
790 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
791 * update. We could avoid this with linked transactions
792 * and passing down the transaction pointer all the way
793 * to attr_set. No previous user of the generic
794 * Posix ACL code seems to care about this issue either.
796 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
797 error = posix_acl_chmod(inode, inode->i_mode);
805 xfs_trans_cancel(tp);
813 xfs_vn_setattr_nonsize(
814 struct dentry *dentry,
817 struct xfs_inode *ip = XFS_I(d_inode(dentry));
820 trace_xfs_setattr(ip);
822 error = xfs_vn_change_ok(dentry, iattr);
825 return xfs_setattr_nonsize(ip, iattr, 0);
829 * Truncate file. Must have write permission and not be a directory.
831 * Caution: The caller of this function is responsible for calling
832 * setattr_prepare() or otherwise verifying the change is fine.
836 struct xfs_inode *ip,
839 struct xfs_mount *mp = ip->i_mount;
840 struct inode *inode = VFS_I(ip);
841 xfs_off_t oldsize, newsize;
842 struct xfs_trans *tp;
845 bool did_zeroing = false;
847 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
848 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
849 ASSERT(S_ISREG(inode->i_mode));
850 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
851 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
853 oldsize = inode->i_size;
854 newsize = iattr->ia_size;
857 * Short circuit the truncate case for zero length files.
859 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
860 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
864 * Use the regular setattr path to update the timestamps.
866 iattr->ia_valid &= ~ATTR_SIZE;
867 return xfs_setattr_nonsize(ip, iattr, 0);
871 * Make sure that the dquots are attached to the inode.
873 error = xfs_qm_dqattach(ip);
878 * Wait for all direct I/O to complete.
880 inode_dio_wait(inode);
883 * File data changes must be complete before we start the transaction to
884 * modify the inode. This needs to be done before joining the inode to
885 * the transaction because the inode cannot be unlocked once it is a
886 * part of the transaction.
888 * Start with zeroing any data beyond EOF that we may expose on file
889 * extension, or zeroing out the rest of the block on a downward
892 if (newsize > oldsize) {
893 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
894 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
895 &did_zeroing, &xfs_iomap_ops);
897 error = iomap_truncate_page(inode, newsize, &did_zeroing,
905 * We've already locked out new page faults, so now we can safely remove
906 * pages from the page cache knowing they won't get refaulted until we
907 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
908 * complete. The truncate_setsize() call also cleans partial EOF page
909 * PTEs on extending truncates and hence ensures sub-page block size
910 * filesystems are correctly handled, too.
912 * We have to do all the page cache truncate work outside the
913 * transaction context as the "lock" order is page lock->log space
914 * reservation as defined by extent allocation in the writeback path.
915 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
916 * having already truncated the in-memory version of the file (i.e. made
917 * user visible changes). There's not much we can do about this, except
918 * to hope that the caller sees ENOMEM and retries the truncate
921 * And we update in-core i_size and truncate page cache beyond newsize
922 * before writeback the [di_size, newsize] range, so we're guaranteed
923 * not to write stale data past the new EOF on truncate down.
925 truncate_setsize(inode, newsize);
928 * We are going to log the inode size change in this transaction so
929 * any previous writes that are beyond the on disk EOF and the new
930 * EOF that have not been written out need to be written here. If we
931 * do not write the data out, we expose ourselves to the null files
932 * problem. Note that this includes any block zeroing we did above;
933 * otherwise those blocks may not be zeroed after a crash.
936 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
937 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
938 ip->i_d.di_size, newsize - 1);
943 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
947 lock_flags |= XFS_ILOCK_EXCL;
948 xfs_ilock(ip, XFS_ILOCK_EXCL);
949 xfs_trans_ijoin(tp, ip, 0);
952 * Only change the c/mtime if we are changing the size or we are
953 * explicitly asked to change it. This handles the semantic difference
954 * between truncate() and ftruncate() as implemented in the VFS.
956 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
957 * special case where we need to update the times despite not having
958 * these flags set. For all other operations the VFS set these flags
959 * explicitly if it wants a timestamp update.
961 if (newsize != oldsize &&
962 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
963 iattr->ia_ctime = iattr->ia_mtime =
965 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
969 * The first thing we do is set the size to new_size permanently on
970 * disk. This way we don't have to worry about anyone ever being able
971 * to look at the data being freed even in the face of a crash.
972 * What we're getting around here is the case where we free a block, it
973 * is allocated to another file, it is written to, and then we crash.
974 * If the new data gets written to the file but the log buffers
975 * containing the free and reallocation don't, then we'd end up with
976 * garbage in the blocks being freed. As long as we make the new size
977 * permanent before actually freeing any blocks it doesn't matter if
978 * they get written to.
980 ip->i_d.di_size = newsize;
981 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
983 if (newsize <= oldsize) {
984 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
986 goto out_trans_cancel;
989 * Truncated "down", so we're removing references to old data
990 * here - if we delay flushing for a long time, we expose
991 * ourselves unduly to the notorious NULL files problem. So,
992 * we mark this inode and flush it when the file is closed,
993 * and do not wait the usual (long) time for writeout.
995 xfs_iflags_set(ip, XFS_ITRUNCATED);
997 /* A truncate down always removes post-EOF blocks. */
998 xfs_inode_clear_eofblocks_tag(ip);
1001 if (iattr->ia_valid & ATTR_MODE)
1002 xfs_setattr_mode(ip, iattr);
1003 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
1004 xfs_setattr_time(ip, iattr);
1006 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1008 XFS_STATS_INC(mp, xs_ig_attrchg);
1010 if (mp->m_flags & XFS_MOUNT_WSYNC)
1011 xfs_trans_set_sync(tp);
1013 error = xfs_trans_commit(tp);
1016 xfs_iunlock(ip, lock_flags);
1020 xfs_trans_cancel(tp);
1025 xfs_vn_setattr_size(
1026 struct dentry *dentry,
1027 struct iattr *iattr)
1029 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1032 trace_xfs_setattr(ip);
1034 error = xfs_vn_change_ok(dentry, iattr);
1037 return xfs_setattr_size(ip, iattr);
1042 struct dentry *dentry,
1043 struct iattr *iattr)
1047 if (iattr->ia_valid & ATTR_SIZE) {
1048 struct inode *inode = d_inode(dentry);
1049 struct xfs_inode *ip = XFS_I(inode);
1052 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1053 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1055 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1057 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1061 error = xfs_vn_setattr_size(dentry, iattr);
1062 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1064 error = xfs_vn_setattr_nonsize(dentry, iattr);
1072 struct inode *inode,
1073 struct timespec64 *now,
1076 struct xfs_inode *ip = XFS_I(inode);
1077 struct xfs_mount *mp = ip->i_mount;
1078 int log_flags = XFS_ILOG_TIMESTAMP;
1079 struct xfs_trans *tp;
1082 trace_xfs_update_time(ip);
1084 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1085 if (!((flags & S_VERSION) &&
1086 inode_maybe_inc_iversion(inode, false)))
1087 return generic_update_time(inode, now, flags);
1089 /* Capture the iversion update that just occurred */
1090 log_flags |= XFS_ILOG_CORE;
1093 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1097 xfs_ilock(ip, XFS_ILOCK_EXCL);
1098 if (flags & S_CTIME)
1099 inode->i_ctime = *now;
1100 if (flags & S_MTIME)
1101 inode->i_mtime = *now;
1102 if (flags & S_ATIME)
1103 inode->i_atime = *now;
1105 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1106 xfs_trans_log_inode(tp, ip, log_flags);
1107 return xfs_trans_commit(tp);
1112 struct inode *inode,
1113 struct fiemap_extent_info *fieinfo,
1119 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1120 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1121 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1122 error = iomap_fiemap(inode, fieinfo, start, length,
1123 &xfs_xattr_iomap_ops);
1125 error = iomap_fiemap(inode, fieinfo, start, length,
1128 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1136 struct dentry *dentry,
1139 return xfs_generic_create(dir, dentry, mode, 0, true);
1142 static const struct inode_operations xfs_inode_operations = {
1143 .get_acl = xfs_get_acl,
1144 .set_acl = xfs_set_acl,
1145 .getattr = xfs_vn_getattr,
1146 .setattr = xfs_vn_setattr,
1147 .listxattr = xfs_vn_listxattr,
1148 .fiemap = xfs_vn_fiemap,
1149 .update_time = xfs_vn_update_time,
1152 static const struct inode_operations xfs_dir_inode_operations = {
1153 .create = xfs_vn_create,
1154 .lookup = xfs_vn_lookup,
1155 .link = xfs_vn_link,
1156 .unlink = xfs_vn_unlink,
1157 .symlink = xfs_vn_symlink,
1158 .mkdir = xfs_vn_mkdir,
1160 * Yes, XFS uses the same method for rmdir and unlink.
1162 * There are some subtile differences deeper in the code,
1163 * but we use S_ISDIR to check for those.
1165 .rmdir = xfs_vn_unlink,
1166 .mknod = xfs_vn_mknod,
1167 .rename = xfs_vn_rename,
1168 .get_acl = xfs_get_acl,
1169 .set_acl = xfs_set_acl,
1170 .getattr = xfs_vn_getattr,
1171 .setattr = xfs_vn_setattr,
1172 .listxattr = xfs_vn_listxattr,
1173 .update_time = xfs_vn_update_time,
1174 .tmpfile = xfs_vn_tmpfile,
1177 static const struct inode_operations xfs_dir_ci_inode_operations = {
1178 .create = xfs_vn_create,
1179 .lookup = xfs_vn_ci_lookup,
1180 .link = xfs_vn_link,
1181 .unlink = xfs_vn_unlink,
1182 .symlink = xfs_vn_symlink,
1183 .mkdir = xfs_vn_mkdir,
1185 * Yes, XFS uses the same method for rmdir and unlink.
1187 * There are some subtile differences deeper in the code,
1188 * but we use S_ISDIR to check for those.
1190 .rmdir = xfs_vn_unlink,
1191 .mknod = xfs_vn_mknod,
1192 .rename = xfs_vn_rename,
1193 .get_acl = xfs_get_acl,
1194 .set_acl = xfs_set_acl,
1195 .getattr = xfs_vn_getattr,
1196 .setattr = xfs_vn_setattr,
1197 .listxattr = xfs_vn_listxattr,
1198 .update_time = xfs_vn_update_time,
1199 .tmpfile = xfs_vn_tmpfile,
1202 static const struct inode_operations xfs_symlink_inode_operations = {
1203 .get_link = xfs_vn_get_link,
1204 .getattr = xfs_vn_getattr,
1205 .setattr = xfs_vn_setattr,
1206 .listxattr = xfs_vn_listxattr,
1207 .update_time = xfs_vn_update_time,
1210 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1211 .get_link = xfs_vn_get_link_inline,
1212 .getattr = xfs_vn_getattr,
1213 .setattr = xfs_vn_setattr,
1214 .listxattr = xfs_vn_listxattr,
1215 .update_time = xfs_vn_update_time,
1218 /* Figure out if this file actually supports DAX. */
1220 xfs_inode_supports_dax(
1221 struct xfs_inode *ip)
1223 struct xfs_mount *mp = ip->i_mount;
1225 /* Only supported on non-reflinked files. */
1226 if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
1229 /* DAX mount option or DAX iflag must be set. */
1230 if (!(mp->m_flags & XFS_MOUNT_DAX) &&
1231 !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1234 /* Block size must match page size */
1235 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1238 /* Device has to support DAX too. */
1239 return xfs_find_daxdev_for_inode(VFS_I(ip)) != NULL;
1243 xfs_diflags_to_iflags(
1244 struct inode *inode,
1245 struct xfs_inode *ip)
1247 uint16_t flags = ip->i_d.di_flags;
1249 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1252 if (flags & XFS_DIFLAG_IMMUTABLE)
1253 inode->i_flags |= S_IMMUTABLE;
1254 if (flags & XFS_DIFLAG_APPEND)
1255 inode->i_flags |= S_APPEND;
1256 if (flags & XFS_DIFLAG_SYNC)
1257 inode->i_flags |= S_SYNC;
1258 if (flags & XFS_DIFLAG_NOATIME)
1259 inode->i_flags |= S_NOATIME;
1260 if (xfs_inode_supports_dax(ip))
1261 inode->i_flags |= S_DAX;
1265 * Initialize the Linux inode.
1267 * When reading existing inodes from disk this is called directly from xfs_iget,
1268 * when creating a new inode it is called from xfs_ialloc after setting up the
1269 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1270 * it up to the caller to deal with unlocking the inode appropriately.
1274 struct xfs_inode *ip)
1276 struct inode *inode = &ip->i_vnode;
1279 inode->i_ino = ip->i_ino;
1280 inode->i_state = I_NEW;
1282 inode_sb_list_add(inode);
1283 /* make the inode look hashed for the writeback code */
1284 inode_fake_hash(inode);
1286 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1287 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1289 i_size_write(inode, ip->i_d.di_size);
1290 xfs_diflags_to_iflags(inode, ip);
1292 if (S_ISDIR(inode->i_mode)) {
1294 * We set the i_rwsem class here to avoid potential races with
1295 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1296 * after a filehandle lookup has already found the inode in
1297 * cache before it has been unlocked via unlock_new_inode().
1299 lockdep_set_class(&inode->i_rwsem,
1300 &inode->i_sb->s_type->i_mutex_dir_key);
1301 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1302 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1304 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1305 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1309 * Ensure all page cache allocations are done from GFP_NOFS context to
1310 * prevent direct reclaim recursion back into the filesystem and blowing
1311 * stacks or deadlocking.
1313 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1314 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1317 * If there is no attribute fork no ACL can exist on this inode,
1318 * and it can't have any file capabilities attached to it either.
1320 if (!XFS_IFORK_Q(ip)) {
1321 inode_has_no_xattr(inode);
1322 cache_no_acl(inode);
1328 struct xfs_inode *ip)
1330 struct inode *inode = &ip->i_vnode;
1332 switch (inode->i_mode & S_IFMT) {
1334 inode->i_op = &xfs_inode_operations;
1335 inode->i_fop = &xfs_file_operations;
1337 inode->i_mapping->a_ops = &xfs_dax_aops;
1339 inode->i_mapping->a_ops = &xfs_address_space_operations;
1342 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1343 inode->i_op = &xfs_dir_ci_inode_operations;
1345 inode->i_op = &xfs_dir_inode_operations;
1346 inode->i_fop = &xfs_dir_file_operations;
1349 if (ip->i_df.if_flags & XFS_IFINLINE)
1350 inode->i_op = &xfs_inline_symlink_inode_operations;
1352 inode->i_op = &xfs_symlink_inode_operations;
1355 inode->i_op = &xfs_inode_operations;
1356 init_special_inode(inode, inode->i_mode, inode->i_rdev);