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_inode.h"
15 #include "xfs_quota.h"
17 #include "xfs_trans.h"
18 #include "xfs_trace.h"
19 #include "xfs_icache.h"
20 #include "xfs_symlink.h"
22 #include "xfs_iomap.h"
23 #include "xfs_error.h"
25 #include <linux/posix_acl.h>
26 #include <linux/security.h>
27 #include <linux/iversion.h>
28 #include <linux/fiemap.h>
31 * Directories have different lock order w.r.t. mmap_lock compared to regular
32 * files. This is due to readdir potentially triggering page faults on a user
33 * buffer inside filldir(), and this happens with the ilock on the directory
34 * held. For regular files, the lock order is the other way around - the
35 * mmap_lock is taken during the page fault, and then we lock the ilock to do
36 * block mapping. Hence we need a different class for the directory ilock so
37 * that lockdep can tell them apart.
39 static struct lock_class_key xfs_nondir_ilock_class;
40 static struct lock_class_key xfs_dir_ilock_class;
45 const struct xattr *xattr_array,
48 const struct xattr *xattr;
49 struct xfs_inode *ip = XFS_I(inode);
52 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
53 struct xfs_da_args args = {
55 .attr_filter = XFS_ATTR_SECURE,
57 .namelen = strlen(xattr->name),
58 .value = xattr->value,
59 .valuelen = xattr->value_len,
61 error = xfs_attr_set(&args);
69 * Hook in SELinux. This is not quite correct yet, what we really need
70 * here (as we do for default ACLs) is a mechanism by which creation of
71 * these attrs can be journalled at inode creation time (along with the
72 * inode, of course, such that log replay can't cause these to be lost).
79 const struct qstr *qstr)
81 return security_inode_init_security(inode, dir, qstr,
82 &xfs_initxattrs, NULL);
87 struct xfs_name *namep,
88 struct dentry *dentry)
90 namep->name = dentry->d_name.name;
91 namep->len = dentry->d_name.len;
92 namep->type = XFS_DIR3_FT_UNKNOWN;
96 xfs_dentry_mode_to_name(
97 struct xfs_name *namep,
98 struct dentry *dentry,
101 namep->name = dentry->d_name.name;
102 namep->len = dentry->d_name.len;
103 namep->type = xfs_mode_to_ftype(mode);
105 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
106 return -EFSCORRUPTED;
115 struct dentry *dentry)
117 struct xfs_name teardown;
120 * If we can't add the ACL or we fail in
121 * xfs_init_security we must back out.
122 * ENOSPC can hit here, among other things.
124 xfs_dentry_to_name(&teardown, dentry);
126 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
132 struct dentry *dentry,
135 bool tmpfile) /* unnamed file */
138 struct xfs_inode *ip = NULL;
139 struct posix_acl *default_acl, *acl;
140 struct xfs_name name;
144 * Irix uses Missed'em'V split, but doesn't want to see
145 * the upper 5 bits of (14bit) major.
147 if (S_ISCHR(mode) || S_ISBLK(mode)) {
148 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
154 error = posix_acl_create(dir, &mode, &default_acl, &acl);
158 /* Verify mode is valid also for tmpfile case */
159 error = xfs_dentry_mode_to_name(&name, dentry, mode);
164 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
166 error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
173 error = xfs_init_security(inode, dir, &dentry->d_name);
175 goto out_cleanup_inode;
177 #ifdef CONFIG_XFS_POSIX_ACL
179 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
181 goto out_cleanup_inode;
184 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
186 goto out_cleanup_inode;
194 * The VFS requires that any inode fed to d_tmpfile must have
195 * nlink == 1 so that it can decrement the nlink in d_tmpfile.
196 * However, we created the temp file with nlink == 0 because
197 * we're not allowed to put an inode with nlink > 0 on the
198 * unlinked list. Therefore we have to set nlink to 1 so that
199 * d_tmpfile can immediately set it back to zero.
202 d_tmpfile(dentry, inode);
204 d_instantiate(dentry, inode);
206 xfs_finish_inode_setup(ip);
210 posix_acl_release(default_acl);
212 posix_acl_release(acl);
216 xfs_finish_inode_setup(ip);
218 xfs_cleanup_inode(dir, inode, dentry);
226 struct dentry *dentry,
230 return xfs_generic_create(dir, dentry, mode, rdev, false);
236 struct dentry *dentry,
240 return xfs_generic_create(dir, dentry, mode, 0, false);
246 struct dentry *dentry,
249 return xfs_generic_create(dir, dentry, mode | S_IFDIR, 0, false);
252 STATIC struct dentry *
255 struct dentry *dentry,
259 struct xfs_inode *cip;
260 struct xfs_name name;
263 if (dentry->d_name.len >= MAXNAMELEN)
264 return ERR_PTR(-ENAMETOOLONG);
266 xfs_dentry_to_name(&name, dentry);
267 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
270 else if (likely(error == -ENOENT))
273 inode = ERR_PTR(error);
274 return d_splice_alias(inode, dentry);
277 STATIC struct dentry *
280 struct dentry *dentry,
283 struct xfs_inode *ip;
284 struct xfs_name xname;
285 struct xfs_name ci_name;
289 if (dentry->d_name.len >= MAXNAMELEN)
290 return ERR_PTR(-ENAMETOOLONG);
292 xfs_dentry_to_name(&xname, dentry);
293 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
294 if (unlikely(error)) {
295 if (unlikely(error != -ENOENT))
296 return ERR_PTR(error);
298 * call d_add(dentry, NULL) here when d_drop_negative_children
299 * is called in xfs_vn_mknod (ie. allow negative dentries
300 * with CI filesystems).
305 /* if exact match, just splice and exit */
307 return d_splice_alias(VFS_I(ip), dentry);
309 /* else case-insensitive match... */
310 dname.name = ci_name.name;
311 dname.len = ci_name.len;
312 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
313 kmem_free(ci_name.name);
319 struct dentry *old_dentry,
321 struct dentry *dentry)
323 struct inode *inode = d_inode(old_dentry);
324 struct xfs_name name;
327 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
331 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
336 d_instantiate(dentry, inode);
343 struct dentry *dentry)
345 struct xfs_name name;
348 xfs_dentry_to_name(&name, dentry);
350 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
355 * With unlink, the VFS makes the dentry "negative": no inode,
356 * but still hashed. This is incompatible with case-insensitive
357 * mode, so invalidate (unhash) the dentry in CI-mode.
359 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
360 d_invalidate(dentry);
367 struct dentry *dentry,
371 struct xfs_inode *cip = NULL;
372 struct xfs_name name;
377 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
378 error = xfs_dentry_mode_to_name(&name, dentry, mode);
382 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
388 error = xfs_init_security(inode, dir, &dentry->d_name);
390 goto out_cleanup_inode;
394 d_instantiate(dentry, inode);
395 xfs_finish_inode_setup(cip);
399 xfs_finish_inode_setup(cip);
400 xfs_cleanup_inode(dir, inode, dentry);
409 struct dentry *odentry,
411 struct dentry *ndentry,
414 struct inode *new_inode = d_inode(ndentry);
417 struct xfs_name oname;
418 struct xfs_name nname;
420 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
423 /* if we are exchanging files, we need to set i_mode of both files */
424 if (flags & RENAME_EXCHANGE)
425 omode = d_inode(ndentry)->i_mode;
427 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
428 if (omode && unlikely(error))
431 error = xfs_dentry_mode_to_name(&nname, ndentry,
432 d_inode(odentry)->i_mode);
436 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
438 new_inode ? XFS_I(new_inode) : NULL, flags);
442 * careful here - this function can get called recursively, so
443 * we need to be very careful about how much stack we use.
444 * uio is kmalloced for this reason...
448 struct dentry *dentry,
450 struct delayed_call *done)
456 return ERR_PTR(-ECHILD);
458 link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
462 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
466 set_delayed_call(done, kfree_link, link);
472 return ERR_PTR(error);
476 xfs_vn_get_link_inline(
477 struct dentry *dentry,
479 struct delayed_call *done)
481 struct xfs_inode *ip = XFS_I(inode);
484 ASSERT(ip->i_df.if_flags & XFS_IFINLINE);
487 * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
490 link = ip->i_df.if_u1.if_data;
491 if (XFS_IS_CORRUPT(ip->i_mount, !link))
492 return ERR_PTR(-EFSCORRUPTED);
498 struct xfs_inode *ip)
500 struct xfs_mount *mp = ip->i_mount;
503 * If the file blocks are being allocated from a realtime volume, then
504 * always return the realtime extent size.
506 if (XFS_IS_REALTIME_INODE(ip))
507 return xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
510 * Allow large block sizes to be reported to userspace programs if the
511 * "largeio" mount option is used.
513 * If compatibility mode is specified, simply return the basic unit of
514 * caching so that we don't get inefficient read/modify/write I/O from
515 * user apps. Otherwise....
517 * If the underlying volume is a stripe, then return the stripe width in
518 * bytes as the recommended I/O size. It is not a stripe and we've set a
519 * default buffered I/O size, return that, otherwise return the compat
522 if (mp->m_flags & XFS_MOUNT_LARGEIO) {
524 return mp->m_swidth << mp->m_sb.sb_blocklog;
525 if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
526 return 1U << mp->m_allocsize_log;
534 const struct path *path,
537 unsigned int query_flags)
539 struct inode *inode = d_inode(path->dentry);
540 struct xfs_inode *ip = XFS_I(inode);
541 struct xfs_mount *mp = ip->i_mount;
543 trace_xfs_getattr(ip);
545 if (XFS_FORCED_SHUTDOWN(mp))
548 stat->size = XFS_ISIZE(ip);
549 stat->dev = inode->i_sb->s_dev;
550 stat->mode = inode->i_mode;
551 stat->nlink = inode->i_nlink;
552 stat->uid = inode->i_uid;
553 stat->gid = inode->i_gid;
554 stat->ino = ip->i_ino;
555 stat->atime = inode->i_atime;
556 stat->mtime = inode->i_mtime;
557 stat->ctime = inode->i_ctime;
559 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
561 if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
562 if (request_mask & STATX_BTIME) {
563 stat->result_mask |= STATX_BTIME;
564 stat->btime = ip->i_d.di_crtime;
569 * Note: If you add another clause to set an attribute flag, please
570 * update attributes_mask below.
572 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
573 stat->attributes |= STATX_ATTR_IMMUTABLE;
574 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
575 stat->attributes |= STATX_ATTR_APPEND;
576 if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
577 stat->attributes |= STATX_ATTR_NODUMP;
579 stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
583 switch (inode->i_mode & S_IFMT) {
586 stat->blksize = BLKDEV_IOSIZE;
587 stat->rdev = inode->i_rdev;
590 stat->blksize = xfs_stat_blksize(ip);
600 struct dentry *dentry,
603 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
605 if (mp->m_flags & XFS_MOUNT_RDONLY)
608 if (XFS_FORCED_SHUTDOWN(mp))
611 return setattr_prepare(dentry, iattr);
615 * Set non-size attributes of an inode.
617 * Caution: The caller of this function is responsible for calling
618 * setattr_prepare() or otherwise verifying the change is fine.
622 struct xfs_inode *ip,
626 xfs_mount_t *mp = ip->i_mount;
627 struct inode *inode = VFS_I(ip);
628 int mask = iattr->ia_valid;
631 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
632 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
633 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
634 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
636 ASSERT((mask & ATTR_SIZE) == 0);
639 * If disk quotas is on, we make sure that the dquots do exist on disk,
640 * before we start any other transactions. Trying to do this later
641 * is messy. We don't care to take a readlock to look at the ids
642 * in inode here, because we can't hold it across the trans_reserve.
643 * If the IDs do change before we take the ilock, we're covered
644 * because the i_*dquot fields will get updated anyway.
646 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
649 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
651 qflags |= XFS_QMOPT_UQUOTA;
655 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
657 qflags |= XFS_QMOPT_GQUOTA;
663 * We take a reference when we initialize udqp and gdqp,
664 * so it is important that we never blindly double trip on
665 * the same variable. See xfs_create() for an example.
667 ASSERT(udqp == NULL);
668 ASSERT(gdqp == NULL);
669 error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_d.di_projid,
670 qflags, &udqp, &gdqp, NULL);
675 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
679 xfs_ilock(ip, XFS_ILOCK_EXCL);
680 xfs_trans_ijoin(tp, ip, 0);
683 * Change file ownership. Must be the owner or privileged.
685 if (mask & (ATTR_UID|ATTR_GID)) {
687 * These IDs could have changed since we last looked at them.
688 * But, we're assured that if the ownership did change
689 * while we didn't have the inode locked, inode's dquot(s)
690 * would have changed also.
694 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
695 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
698 * Do a quota reservation only if uid/gid is actually
701 if (XFS_IS_QUOTA_RUNNING(mp) &&
702 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
703 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
705 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
706 NULL, capable(CAP_FOWNER) ?
707 XFS_QMOPT_FORCE_RES : 0);
708 if (error) /* out of quota */
713 * Change the ownerships and register quota modifications
714 * in the transaction.
716 if (!uid_eq(iuid, uid)) {
717 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
718 ASSERT(mask & ATTR_UID);
720 olddquot1 = xfs_qm_vop_chown(tp, ip,
721 &ip->i_udquot, udqp);
724 if (!gid_eq(igid, gid)) {
725 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
726 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
727 !XFS_IS_PQUOTA_ON(mp));
728 ASSERT(mask & ATTR_GID);
730 olddquot2 = xfs_qm_vop_chown(tp, ip,
731 &ip->i_gdquot, gdqp);
736 setattr_copy(inode, iattr);
737 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
739 XFS_STATS_INC(mp, xs_ig_attrchg);
741 if (mp->m_flags & XFS_MOUNT_WSYNC)
742 xfs_trans_set_sync(tp);
743 error = xfs_trans_commit(tp);
745 xfs_iunlock(ip, XFS_ILOCK_EXCL);
748 * Release any dquot(s) the inode had kept before chown.
750 xfs_qm_dqrele(olddquot1);
751 xfs_qm_dqrele(olddquot2);
759 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
760 * update. We could avoid this with linked transactions
761 * and passing down the transaction pointer all the way
762 * to attr_set. No previous user of the generic
763 * Posix ACL code seems to care about this issue either.
765 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
766 error = posix_acl_chmod(inode, inode->i_mode);
774 xfs_trans_cancel(tp);
775 xfs_iunlock(ip, XFS_ILOCK_EXCL);
783 xfs_vn_setattr_nonsize(
784 struct dentry *dentry,
787 struct xfs_inode *ip = XFS_I(d_inode(dentry));
790 trace_xfs_setattr(ip);
792 error = xfs_vn_change_ok(dentry, iattr);
795 return xfs_setattr_nonsize(ip, iattr, 0);
799 * Truncate file. Must have write permission and not be a directory.
801 * Caution: The caller of this function is responsible for calling
802 * setattr_prepare() or otherwise verifying the change is fine.
806 struct xfs_inode *ip,
809 struct xfs_mount *mp = ip->i_mount;
810 struct inode *inode = VFS_I(ip);
811 xfs_off_t oldsize, newsize;
812 struct xfs_trans *tp;
815 bool did_zeroing = false;
817 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
818 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
819 ASSERT(S_ISREG(inode->i_mode));
820 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
821 ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
823 oldsize = inode->i_size;
824 newsize = iattr->ia_size;
827 * Short circuit the truncate case for zero length files.
829 if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
830 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
834 * Use the regular setattr path to update the timestamps.
836 iattr->ia_valid &= ~ATTR_SIZE;
837 return xfs_setattr_nonsize(ip, iattr, 0);
841 * Make sure that the dquots are attached to the inode.
843 error = xfs_qm_dqattach(ip);
848 * Wait for all direct I/O to complete.
850 inode_dio_wait(inode);
853 * File data changes must be complete before we start the transaction to
854 * modify the inode. This needs to be done before joining the inode to
855 * the transaction because the inode cannot be unlocked once it is a
856 * part of the transaction.
858 * Start with zeroing any data beyond EOF that we may expose on file
859 * extension, or zeroing out the rest of the block on a downward
862 if (newsize > oldsize) {
863 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
864 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
865 &did_zeroing, &xfs_buffered_write_iomap_ops);
868 * iomap won't detect a dirty page over an unwritten block (or a
869 * cow block over a hole) and subsequently skips zeroing the
870 * newly post-EOF portion of the page. Flush the new EOF to
871 * convert the block before the pagecache truncate.
873 error = filemap_write_and_wait_range(inode->i_mapping, newsize,
877 error = iomap_truncate_page(inode, newsize, &did_zeroing,
878 &xfs_buffered_write_iomap_ops);
885 * We've already locked out new page faults, so now we can safely remove
886 * pages from the page cache knowing they won't get refaulted until we
887 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
888 * complete. The truncate_setsize() call also cleans partial EOF page
889 * PTEs on extending truncates and hence ensures sub-page block size
890 * filesystems are correctly handled, too.
892 * We have to do all the page cache truncate work outside the
893 * transaction context as the "lock" order is page lock->log space
894 * reservation as defined by extent allocation in the writeback path.
895 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
896 * having already truncated the in-memory version of the file (i.e. made
897 * user visible changes). There's not much we can do about this, except
898 * to hope that the caller sees ENOMEM and retries the truncate
901 * And we update in-core i_size and truncate page cache beyond newsize
902 * before writeback the [di_size, newsize] range, so we're guaranteed
903 * not to write stale data past the new EOF on truncate down.
905 truncate_setsize(inode, newsize);
908 * We are going to log the inode size change in this transaction so
909 * any previous writes that are beyond the on disk EOF and the new
910 * EOF that have not been written out need to be written here. If we
911 * do not write the data out, we expose ourselves to the null files
912 * problem. Note that this includes any block zeroing we did above;
913 * otherwise those blocks may not be zeroed after a crash.
916 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
917 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
918 ip->i_d.di_size, newsize - 1);
923 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
927 lock_flags |= XFS_ILOCK_EXCL;
928 xfs_ilock(ip, XFS_ILOCK_EXCL);
929 xfs_trans_ijoin(tp, ip, 0);
932 * Only change the c/mtime if we are changing the size or we are
933 * explicitly asked to change it. This handles the semantic difference
934 * between truncate() and ftruncate() as implemented in the VFS.
936 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
937 * special case where we need to update the times despite not having
938 * these flags set. For all other operations the VFS set these flags
939 * explicitly if it wants a timestamp update.
941 if (newsize != oldsize &&
942 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
943 iattr->ia_ctime = iattr->ia_mtime =
945 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
949 * The first thing we do is set the size to new_size permanently on
950 * disk. This way we don't have to worry about anyone ever being able
951 * to look at the data being freed even in the face of a crash.
952 * What we're getting around here is the case where we free a block, it
953 * is allocated to another file, it is written to, and then we crash.
954 * If the new data gets written to the file but the log buffers
955 * containing the free and reallocation don't, then we'd end up with
956 * garbage in the blocks being freed. As long as we make the new size
957 * permanent before actually freeing any blocks it doesn't matter if
958 * they get written to.
960 ip->i_d.di_size = newsize;
961 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
963 if (newsize <= oldsize) {
964 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
966 goto out_trans_cancel;
969 * Truncated "down", so we're removing references to old data
970 * here - if we delay flushing for a long time, we expose
971 * ourselves unduly to the notorious NULL files problem. So,
972 * we mark this inode and flush it when the file is closed,
973 * and do not wait the usual (long) time for writeout.
975 xfs_iflags_set(ip, XFS_ITRUNCATED);
977 /* A truncate down always removes post-EOF blocks. */
978 xfs_inode_clear_eofblocks_tag(ip);
981 ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
982 setattr_copy(inode, iattr);
983 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
985 XFS_STATS_INC(mp, xs_ig_attrchg);
987 if (mp->m_flags & XFS_MOUNT_WSYNC)
988 xfs_trans_set_sync(tp);
990 error = xfs_trans_commit(tp);
993 xfs_iunlock(ip, lock_flags);
997 xfs_trans_cancel(tp);
1002 xfs_vn_setattr_size(
1003 struct dentry *dentry,
1004 struct iattr *iattr)
1006 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1009 trace_xfs_setattr(ip);
1011 error = xfs_vn_change_ok(dentry, iattr);
1014 return xfs_setattr_size(ip, iattr);
1019 struct dentry *dentry,
1020 struct iattr *iattr)
1024 if (iattr->ia_valid & ATTR_SIZE) {
1025 struct inode *inode = d_inode(dentry);
1026 struct xfs_inode *ip = XFS_I(inode);
1029 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1030 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1032 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1034 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1038 error = xfs_vn_setattr_size(dentry, iattr);
1039 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1041 error = xfs_vn_setattr_nonsize(dentry, iattr);
1049 struct inode *inode,
1050 struct timespec64 *now,
1053 struct xfs_inode *ip = XFS_I(inode);
1054 struct xfs_mount *mp = ip->i_mount;
1055 int log_flags = XFS_ILOG_TIMESTAMP;
1056 struct xfs_trans *tp;
1059 trace_xfs_update_time(ip);
1061 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1062 if (!((flags & S_VERSION) &&
1063 inode_maybe_inc_iversion(inode, false)))
1064 return generic_update_time(inode, now, flags);
1066 /* Capture the iversion update that just occurred */
1067 log_flags |= XFS_ILOG_CORE;
1070 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1074 xfs_ilock(ip, XFS_ILOCK_EXCL);
1075 if (flags & S_CTIME)
1076 inode->i_ctime = *now;
1077 if (flags & S_MTIME)
1078 inode->i_mtime = *now;
1079 if (flags & S_ATIME)
1080 inode->i_atime = *now;
1082 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1083 xfs_trans_log_inode(tp, ip, log_flags);
1084 return xfs_trans_commit(tp);
1089 struct inode *inode,
1090 struct fiemap_extent_info *fieinfo,
1096 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1097 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1098 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1099 error = iomap_fiemap(inode, fieinfo, start, length,
1100 &xfs_xattr_iomap_ops);
1102 error = iomap_fiemap(inode, fieinfo, start, length,
1103 &xfs_read_iomap_ops);
1105 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1113 struct dentry *dentry,
1116 return xfs_generic_create(dir, dentry, mode, 0, true);
1119 static const struct inode_operations xfs_inode_operations = {
1120 .get_acl = xfs_get_acl,
1121 .set_acl = xfs_set_acl,
1122 .getattr = xfs_vn_getattr,
1123 .setattr = xfs_vn_setattr,
1124 .listxattr = xfs_vn_listxattr,
1125 .fiemap = xfs_vn_fiemap,
1126 .update_time = xfs_vn_update_time,
1129 static const struct inode_operations xfs_dir_inode_operations = {
1130 .create = xfs_vn_create,
1131 .lookup = xfs_vn_lookup,
1132 .link = xfs_vn_link,
1133 .unlink = xfs_vn_unlink,
1134 .symlink = xfs_vn_symlink,
1135 .mkdir = xfs_vn_mkdir,
1137 * Yes, XFS uses the same method for rmdir and unlink.
1139 * There are some subtile differences deeper in the code,
1140 * but we use S_ISDIR to check for those.
1142 .rmdir = xfs_vn_unlink,
1143 .mknod = xfs_vn_mknod,
1144 .rename = xfs_vn_rename,
1145 .get_acl = xfs_get_acl,
1146 .set_acl = xfs_set_acl,
1147 .getattr = xfs_vn_getattr,
1148 .setattr = xfs_vn_setattr,
1149 .listxattr = xfs_vn_listxattr,
1150 .update_time = xfs_vn_update_time,
1151 .tmpfile = xfs_vn_tmpfile,
1154 static const struct inode_operations xfs_dir_ci_inode_operations = {
1155 .create = xfs_vn_create,
1156 .lookup = xfs_vn_ci_lookup,
1157 .link = xfs_vn_link,
1158 .unlink = xfs_vn_unlink,
1159 .symlink = xfs_vn_symlink,
1160 .mkdir = xfs_vn_mkdir,
1162 * Yes, XFS uses the same method for rmdir and unlink.
1164 * There are some subtile differences deeper in the code,
1165 * but we use S_ISDIR to check for those.
1167 .rmdir = xfs_vn_unlink,
1168 .mknod = xfs_vn_mknod,
1169 .rename = xfs_vn_rename,
1170 .get_acl = xfs_get_acl,
1171 .set_acl = xfs_set_acl,
1172 .getattr = xfs_vn_getattr,
1173 .setattr = xfs_vn_setattr,
1174 .listxattr = xfs_vn_listxattr,
1175 .update_time = xfs_vn_update_time,
1176 .tmpfile = xfs_vn_tmpfile,
1179 static const struct inode_operations xfs_symlink_inode_operations = {
1180 .get_link = xfs_vn_get_link,
1181 .getattr = xfs_vn_getattr,
1182 .setattr = xfs_vn_setattr,
1183 .listxattr = xfs_vn_listxattr,
1184 .update_time = xfs_vn_update_time,
1187 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1188 .get_link = xfs_vn_get_link_inline,
1189 .getattr = xfs_vn_getattr,
1190 .setattr = xfs_vn_setattr,
1191 .listxattr = xfs_vn_listxattr,
1192 .update_time = xfs_vn_update_time,
1195 /* Figure out if this file actually supports DAX. */
1197 xfs_inode_supports_dax(
1198 struct xfs_inode *ip)
1200 struct xfs_mount *mp = ip->i_mount;
1202 /* Only supported on regular files. */
1203 if (!S_ISREG(VFS_I(ip)->i_mode))
1206 /* Only supported on non-reflinked files. */
1207 if (xfs_is_reflink_inode(ip))
1210 /* Block size must match page size */
1211 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1214 /* Device has to support DAX too. */
1215 return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1219 xfs_inode_should_enable_dax(
1220 struct xfs_inode *ip)
1222 if (!IS_ENABLED(CONFIG_FS_DAX))
1224 if (ip->i_mount->m_flags & XFS_MOUNT_DAX_NEVER)
1226 if (!xfs_inode_supports_dax(ip))
1228 if (ip->i_mount->m_flags & XFS_MOUNT_DAX_ALWAYS)
1230 if (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
1236 xfs_diflags_to_iflags(
1237 struct xfs_inode *ip,
1240 struct inode *inode = VFS_I(ip);
1241 unsigned int xflags = xfs_ip2xflags(ip);
1242 unsigned int flags = 0;
1244 ASSERT(!(IS_DAX(inode) && init));
1246 if (xflags & FS_XFLAG_IMMUTABLE)
1247 flags |= S_IMMUTABLE;
1248 if (xflags & FS_XFLAG_APPEND)
1250 if (xflags & FS_XFLAG_SYNC)
1252 if (xflags & FS_XFLAG_NOATIME)
1254 if (init && xfs_inode_should_enable_dax(ip))
1258 * S_DAX can only be set during inode initialization and is never set by
1259 * the VFS, so we cannot mask off S_DAX in i_flags.
1261 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1262 inode->i_flags |= flags;
1266 * Initialize the Linux inode.
1268 * When reading existing inodes from disk this is called directly from xfs_iget,
1269 * when creating a new inode it is called from xfs_ialloc after setting up the
1270 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1271 * it up to the caller to deal with unlocking the inode appropriately.
1275 struct xfs_inode *ip)
1277 struct inode *inode = &ip->i_vnode;
1280 inode->i_ino = ip->i_ino;
1281 inode->i_state |= I_NEW;
1283 inode_sb_list_add(inode);
1284 /* make the inode look hashed for the writeback code */
1285 inode_fake_hash(inode);
1287 i_size_write(inode, ip->i_d.di_size);
1288 xfs_diflags_to_iflags(ip, true);
1290 if (S_ISDIR(inode->i_mode)) {
1292 * We set the i_rwsem class here to avoid potential races with
1293 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1294 * after a filehandle lookup has already found the inode in
1295 * cache before it has been unlocked via unlock_new_inode().
1297 lockdep_set_class(&inode->i_rwsem,
1298 &inode->i_sb->s_type->i_mutex_dir_key);
1299 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1301 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1305 * Ensure all page cache allocations are done from GFP_NOFS context to
1306 * prevent direct reclaim recursion back into the filesystem and blowing
1307 * stacks or deadlocking.
1309 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1310 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1313 * If there is no attribute fork no ACL can exist on this inode,
1314 * and it can't have any file capabilities attached to it either.
1316 if (!XFS_IFORK_Q(ip)) {
1317 inode_has_no_xattr(inode);
1318 cache_no_acl(inode);
1324 struct xfs_inode *ip)
1326 struct inode *inode = &ip->i_vnode;
1328 switch (inode->i_mode & S_IFMT) {
1330 inode->i_op = &xfs_inode_operations;
1331 inode->i_fop = &xfs_file_operations;
1333 inode->i_mapping->a_ops = &xfs_dax_aops;
1335 inode->i_mapping->a_ops = &xfs_address_space_operations;
1338 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1339 inode->i_op = &xfs_dir_ci_inode_operations;
1341 inode->i_op = &xfs_dir_inode_operations;
1342 inode->i_fop = &xfs_dir_file_operations;
1345 if (ip->i_df.if_flags & XFS_IFINLINE)
1346 inode->i_op = &xfs_inline_symlink_inode_operations;
1348 inode->i_op = &xfs_symlink_inode_operations;
1351 inode->i_op = &xfs_inode_operations;
1352 init_special_inode(inode, inode->i_mode, inode->i_rdev);