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_vn_mknod(dir, dentry, mode, 0);
246 struct dentry *dentry,
249 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
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 xfs_inode *ip,
603 struct inode *inode = VFS_I(ip);
604 umode_t mode = iattr->ia_mode;
606 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
608 inode->i_mode &= S_IFMT;
609 inode->i_mode |= mode & ~S_IFMT;
614 struct xfs_inode *ip,
617 struct inode *inode = VFS_I(ip);
619 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
621 if (iattr->ia_valid & ATTR_ATIME)
622 inode->i_atime = iattr->ia_atime;
623 if (iattr->ia_valid & ATTR_CTIME)
624 inode->i_ctime = iattr->ia_ctime;
625 if (iattr->ia_valid & ATTR_MTIME)
626 inode->i_mtime = iattr->ia_mtime;
631 struct dentry *dentry,
634 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
636 if (mp->m_flags & XFS_MOUNT_RDONLY)
639 if (XFS_FORCED_SHUTDOWN(mp))
642 return setattr_prepare(dentry, iattr);
646 * Set non-size attributes of an inode.
648 * Caution: The caller of this function is responsible for calling
649 * setattr_prepare() or otherwise verifying the change is fine.
653 struct xfs_inode *ip,
657 xfs_mount_t *mp = ip->i_mount;
658 struct inode *inode = VFS_I(ip);
659 int mask = iattr->ia_valid;
662 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
663 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
664 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
665 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
667 ASSERT((mask & ATTR_SIZE) == 0);
670 * If disk quotas is on, we make sure that the dquots do exist on disk,
671 * before we start any other transactions. Trying to do this later
672 * is messy. We don't care to take a readlock to look at the ids
673 * in inode here, because we can't hold it across the trans_reserve.
674 * If the IDs do change before we take the ilock, we're covered
675 * because the i_*dquot fields will get updated anyway.
677 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
680 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
682 qflags |= XFS_QMOPT_UQUOTA;
686 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
688 qflags |= XFS_QMOPT_GQUOTA;
694 * We take a reference when we initialize udqp and gdqp,
695 * so it is important that we never blindly double trip on
696 * the same variable. See xfs_create() for an example.
698 ASSERT(udqp == NULL);
699 ASSERT(gdqp == NULL);
700 error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_d.di_projid,
701 qflags, &udqp, &gdqp, NULL);
706 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
710 xfs_ilock(ip, XFS_ILOCK_EXCL);
711 xfs_trans_ijoin(tp, ip, 0);
714 * Change file ownership. Must be the owner or privileged.
716 if (mask & (ATTR_UID|ATTR_GID)) {
718 * These IDs could have changed since we last looked at them.
719 * But, we're assured that if the ownership did change
720 * while we didn't have the inode locked, inode's dquot(s)
721 * would have changed also.
725 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
726 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
729 * Do a quota reservation only if uid/gid is actually
732 if (XFS_IS_QUOTA_RUNNING(mp) &&
733 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
734 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
736 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
737 NULL, capable(CAP_FOWNER) ?
738 XFS_QMOPT_FORCE_RES : 0);
739 if (error) /* out of quota */
744 * CAP_FSETID overrides the following restrictions:
746 * The set-user-ID and set-group-ID bits of a file will be
747 * cleared upon successful return from chown()
749 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
750 !capable(CAP_FSETID))
751 inode->i_mode &= ~(S_ISUID|S_ISGID);
754 * Change the ownerships and register quota modifications
755 * in the transaction.
757 if (!uid_eq(iuid, uid)) {
758 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
759 ASSERT(mask & ATTR_UID);
761 olddquot1 = xfs_qm_vop_chown(tp, ip,
762 &ip->i_udquot, udqp);
766 if (!gid_eq(igid, gid)) {
767 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
768 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
769 !XFS_IS_PQUOTA_ON(mp));
770 ASSERT(mask & ATTR_GID);
772 olddquot2 = xfs_qm_vop_chown(tp, ip,
773 &ip->i_gdquot, gdqp);
779 if (mask & ATTR_MODE)
780 xfs_setattr_mode(ip, iattr);
781 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
782 xfs_setattr_time(ip, iattr);
784 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
786 XFS_STATS_INC(mp, xs_ig_attrchg);
788 if (mp->m_flags & XFS_MOUNT_WSYNC)
789 xfs_trans_set_sync(tp);
790 error = xfs_trans_commit(tp);
792 xfs_iunlock(ip, XFS_ILOCK_EXCL);
795 * Release any dquot(s) the inode had kept before chown.
797 xfs_qm_dqrele(olddquot1);
798 xfs_qm_dqrele(olddquot2);
806 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
807 * update. We could avoid this with linked transactions
808 * and passing down the transaction pointer all the way
809 * to attr_set. No previous user of the generic
810 * Posix ACL code seems to care about this issue either.
812 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
813 error = posix_acl_chmod(inode, inode->i_mode);
821 xfs_trans_cancel(tp);
822 xfs_iunlock(ip, XFS_ILOCK_EXCL);
830 xfs_vn_setattr_nonsize(
831 struct dentry *dentry,
834 struct xfs_inode *ip = XFS_I(d_inode(dentry));
837 trace_xfs_setattr(ip);
839 error = xfs_vn_change_ok(dentry, iattr);
842 return xfs_setattr_nonsize(ip, iattr, 0);
846 * Truncate file. Must have write permission and not be a directory.
848 * Caution: The caller of this function is responsible for calling
849 * setattr_prepare() or otherwise verifying the change is fine.
853 struct xfs_inode *ip,
856 struct xfs_mount *mp = ip->i_mount;
857 struct inode *inode = VFS_I(ip);
858 xfs_off_t oldsize, newsize;
859 struct xfs_trans *tp;
862 bool did_zeroing = false;
864 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
865 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
866 ASSERT(S_ISREG(inode->i_mode));
867 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
868 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
870 oldsize = inode->i_size;
871 newsize = iattr->ia_size;
874 * Short circuit the truncate case for zero length files.
876 if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
877 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
881 * Use the regular setattr path to update the timestamps.
883 iattr->ia_valid &= ~ATTR_SIZE;
884 return xfs_setattr_nonsize(ip, iattr, 0);
888 * Make sure that the dquots are attached to the inode.
890 error = xfs_qm_dqattach(ip);
895 * Wait for all direct I/O to complete.
897 inode_dio_wait(inode);
900 * File data changes must be complete before we start the transaction to
901 * modify the inode. This needs to be done before joining the inode to
902 * the transaction because the inode cannot be unlocked once it is a
903 * part of the transaction.
905 * Start with zeroing any data beyond EOF that we may expose on file
906 * extension, or zeroing out the rest of the block on a downward
909 if (newsize > oldsize) {
910 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
911 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
912 &did_zeroing, &xfs_buffered_write_iomap_ops);
914 error = iomap_truncate_page(inode, newsize, &did_zeroing,
915 &xfs_buffered_write_iomap_ops);
922 * We've already locked out new page faults, so now we can safely remove
923 * pages from the page cache knowing they won't get refaulted until we
924 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
925 * complete. The truncate_setsize() call also cleans partial EOF page
926 * PTEs on extending truncates and hence ensures sub-page block size
927 * filesystems are correctly handled, too.
929 * We have to do all the page cache truncate work outside the
930 * transaction context as the "lock" order is page lock->log space
931 * reservation as defined by extent allocation in the writeback path.
932 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
933 * having already truncated the in-memory version of the file (i.e. made
934 * user visible changes). There's not much we can do about this, except
935 * to hope that the caller sees ENOMEM and retries the truncate
938 * And we update in-core i_size and truncate page cache beyond newsize
939 * before writeback the [di_size, newsize] range, so we're guaranteed
940 * not to write stale data past the new EOF on truncate down.
942 truncate_setsize(inode, newsize);
945 * We are going to log the inode size change in this transaction so
946 * any previous writes that are beyond the on disk EOF and the new
947 * EOF that have not been written out need to be written here. If we
948 * do not write the data out, we expose ourselves to the null files
949 * problem. Note that this includes any block zeroing we did above;
950 * otherwise those blocks may not be zeroed after a crash.
953 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
954 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
955 ip->i_d.di_size, newsize - 1);
960 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
964 lock_flags |= XFS_ILOCK_EXCL;
965 xfs_ilock(ip, XFS_ILOCK_EXCL);
966 xfs_trans_ijoin(tp, ip, 0);
969 * Only change the c/mtime if we are changing the size or we are
970 * explicitly asked to change it. This handles the semantic difference
971 * between truncate() and ftruncate() as implemented in the VFS.
973 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
974 * special case where we need to update the times despite not having
975 * these flags set. For all other operations the VFS set these flags
976 * explicitly if it wants a timestamp update.
978 if (newsize != oldsize &&
979 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
980 iattr->ia_ctime = iattr->ia_mtime =
982 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
986 * The first thing we do is set the size to new_size permanently on
987 * disk. This way we don't have to worry about anyone ever being able
988 * to look at the data being freed even in the face of a crash.
989 * What we're getting around here is the case where we free a block, it
990 * is allocated to another file, it is written to, and then we crash.
991 * If the new data gets written to the file but the log buffers
992 * containing the free and reallocation don't, then we'd end up with
993 * garbage in the blocks being freed. As long as we make the new size
994 * permanent before actually freeing any blocks it doesn't matter if
995 * they get written to.
997 ip->i_d.di_size = newsize;
998 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1000 if (newsize <= oldsize) {
1001 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
1003 goto out_trans_cancel;
1006 * Truncated "down", so we're removing references to old data
1007 * here - if we delay flushing for a long time, we expose
1008 * ourselves unduly to the notorious NULL files problem. So,
1009 * we mark this inode and flush it when the file is closed,
1010 * and do not wait the usual (long) time for writeout.
1012 xfs_iflags_set(ip, XFS_ITRUNCATED);
1014 /* A truncate down always removes post-EOF blocks. */
1015 xfs_inode_clear_eofblocks_tag(ip);
1018 if (iattr->ia_valid & ATTR_MODE)
1019 xfs_setattr_mode(ip, iattr);
1020 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
1021 xfs_setattr_time(ip, iattr);
1023 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1025 XFS_STATS_INC(mp, xs_ig_attrchg);
1027 if (mp->m_flags & XFS_MOUNT_WSYNC)
1028 xfs_trans_set_sync(tp);
1030 error = xfs_trans_commit(tp);
1033 xfs_iunlock(ip, lock_flags);
1037 xfs_trans_cancel(tp);
1042 xfs_vn_setattr_size(
1043 struct dentry *dentry,
1044 struct iattr *iattr)
1046 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1049 trace_xfs_setattr(ip);
1051 error = xfs_vn_change_ok(dentry, iattr);
1054 return xfs_setattr_size(ip, iattr);
1059 struct dentry *dentry,
1060 struct iattr *iattr)
1064 if (iattr->ia_valid & ATTR_SIZE) {
1065 struct inode *inode = d_inode(dentry);
1066 struct xfs_inode *ip = XFS_I(inode);
1069 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1070 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1072 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1074 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1078 error = xfs_vn_setattr_size(dentry, iattr);
1079 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1081 error = xfs_vn_setattr_nonsize(dentry, iattr);
1089 struct inode *inode,
1090 struct timespec64 *now,
1093 struct xfs_inode *ip = XFS_I(inode);
1094 struct xfs_mount *mp = ip->i_mount;
1095 int log_flags = XFS_ILOG_TIMESTAMP;
1096 struct xfs_trans *tp;
1099 trace_xfs_update_time(ip);
1101 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1102 if (!((flags & S_VERSION) &&
1103 inode_maybe_inc_iversion(inode, false)))
1104 return generic_update_time(inode, now, flags);
1106 /* Capture the iversion update that just occurred */
1107 log_flags |= XFS_ILOG_CORE;
1110 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1114 xfs_ilock(ip, XFS_ILOCK_EXCL);
1115 if (flags & S_CTIME)
1116 inode->i_ctime = *now;
1117 if (flags & S_MTIME)
1118 inode->i_mtime = *now;
1119 if (flags & S_ATIME)
1120 inode->i_atime = *now;
1122 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1123 xfs_trans_log_inode(tp, ip, log_flags);
1124 return xfs_trans_commit(tp);
1129 struct inode *inode,
1130 struct fiemap_extent_info *fieinfo,
1136 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1137 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1138 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1139 error = iomap_fiemap(inode, fieinfo, start, length,
1140 &xfs_xattr_iomap_ops);
1142 error = iomap_fiemap(inode, fieinfo, start, length,
1143 &xfs_read_iomap_ops);
1145 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1153 struct dentry *dentry,
1156 return xfs_generic_create(dir, dentry, mode, 0, true);
1159 static const struct inode_operations xfs_inode_operations = {
1160 .get_acl = xfs_get_acl,
1161 .set_acl = xfs_set_acl,
1162 .getattr = xfs_vn_getattr,
1163 .setattr = xfs_vn_setattr,
1164 .listxattr = xfs_vn_listxattr,
1165 .fiemap = xfs_vn_fiemap,
1166 .update_time = xfs_vn_update_time,
1169 static const struct inode_operations xfs_dir_inode_operations = {
1170 .create = xfs_vn_create,
1171 .lookup = xfs_vn_lookup,
1172 .link = xfs_vn_link,
1173 .unlink = xfs_vn_unlink,
1174 .symlink = xfs_vn_symlink,
1175 .mkdir = xfs_vn_mkdir,
1177 * Yes, XFS uses the same method for rmdir and unlink.
1179 * There are some subtile differences deeper in the code,
1180 * but we use S_ISDIR to check for those.
1182 .rmdir = xfs_vn_unlink,
1183 .mknod = xfs_vn_mknod,
1184 .rename = xfs_vn_rename,
1185 .get_acl = xfs_get_acl,
1186 .set_acl = xfs_set_acl,
1187 .getattr = xfs_vn_getattr,
1188 .setattr = xfs_vn_setattr,
1189 .listxattr = xfs_vn_listxattr,
1190 .update_time = xfs_vn_update_time,
1191 .tmpfile = xfs_vn_tmpfile,
1194 static const struct inode_operations xfs_dir_ci_inode_operations = {
1195 .create = xfs_vn_create,
1196 .lookup = xfs_vn_ci_lookup,
1197 .link = xfs_vn_link,
1198 .unlink = xfs_vn_unlink,
1199 .symlink = xfs_vn_symlink,
1200 .mkdir = xfs_vn_mkdir,
1202 * Yes, XFS uses the same method for rmdir and unlink.
1204 * There are some subtile differences deeper in the code,
1205 * but we use S_ISDIR to check for those.
1207 .rmdir = xfs_vn_unlink,
1208 .mknod = xfs_vn_mknod,
1209 .rename = xfs_vn_rename,
1210 .get_acl = xfs_get_acl,
1211 .set_acl = xfs_set_acl,
1212 .getattr = xfs_vn_getattr,
1213 .setattr = xfs_vn_setattr,
1214 .listxattr = xfs_vn_listxattr,
1215 .update_time = xfs_vn_update_time,
1216 .tmpfile = xfs_vn_tmpfile,
1219 static const struct inode_operations xfs_symlink_inode_operations = {
1220 .get_link = xfs_vn_get_link,
1221 .getattr = xfs_vn_getattr,
1222 .setattr = xfs_vn_setattr,
1223 .listxattr = xfs_vn_listxattr,
1224 .update_time = xfs_vn_update_time,
1227 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1228 .get_link = xfs_vn_get_link_inline,
1229 .getattr = xfs_vn_getattr,
1230 .setattr = xfs_vn_setattr,
1231 .listxattr = xfs_vn_listxattr,
1232 .update_time = xfs_vn_update_time,
1235 /* Figure out if this file actually supports DAX. */
1237 xfs_inode_supports_dax(
1238 struct xfs_inode *ip)
1240 struct xfs_mount *mp = ip->i_mount;
1242 /* Only supported on regular files. */
1243 if (!S_ISREG(VFS_I(ip)->i_mode))
1246 /* Only supported on non-reflinked files. */
1247 if (xfs_is_reflink_inode(ip))
1250 /* Block size must match page size */
1251 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1254 /* Device has to support DAX too. */
1255 return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1259 xfs_inode_should_enable_dax(
1260 struct xfs_inode *ip)
1262 if (!IS_ENABLED(CONFIG_FS_DAX))
1264 if (ip->i_mount->m_flags & XFS_MOUNT_DAX_NEVER)
1266 if (!xfs_inode_supports_dax(ip))
1268 if (ip->i_mount->m_flags & XFS_MOUNT_DAX_ALWAYS)
1270 if (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
1276 xfs_diflags_to_iflags(
1277 struct xfs_inode *ip,
1280 struct inode *inode = VFS_I(ip);
1281 unsigned int xflags = xfs_ip2xflags(ip);
1282 unsigned int flags = 0;
1284 ASSERT(!(IS_DAX(inode) && init));
1286 if (xflags & FS_XFLAG_IMMUTABLE)
1287 flags |= S_IMMUTABLE;
1288 if (xflags & FS_XFLAG_APPEND)
1290 if (xflags & FS_XFLAG_SYNC)
1292 if (xflags & FS_XFLAG_NOATIME)
1294 if (init && xfs_inode_should_enable_dax(ip))
1298 * S_DAX can only be set during inode initialization and is never set by
1299 * the VFS, so we cannot mask off S_DAX in i_flags.
1301 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1302 inode->i_flags |= flags;
1306 * Initialize the Linux inode.
1308 * When reading existing inodes from disk this is called directly from xfs_iget,
1309 * when creating a new inode it is called from xfs_ialloc after setting up the
1310 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1311 * it up to the caller to deal with unlocking the inode appropriately.
1315 struct xfs_inode *ip)
1317 struct inode *inode = &ip->i_vnode;
1320 inode->i_ino = ip->i_ino;
1321 inode->i_state = I_NEW;
1323 inode_sb_list_add(inode);
1324 /* make the inode look hashed for the writeback code */
1325 inode_fake_hash(inode);
1327 i_size_write(inode, ip->i_d.di_size);
1328 xfs_diflags_to_iflags(ip, true);
1330 if (S_ISDIR(inode->i_mode)) {
1332 * We set the i_rwsem class here to avoid potential races with
1333 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1334 * after a filehandle lookup has already found the inode in
1335 * cache before it has been unlocked via unlock_new_inode().
1337 lockdep_set_class(&inode->i_rwsem,
1338 &inode->i_sb->s_type->i_mutex_dir_key);
1339 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1341 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1345 * Ensure all page cache allocations are done from GFP_NOFS context to
1346 * prevent direct reclaim recursion back into the filesystem and blowing
1347 * stacks or deadlocking.
1349 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1350 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1353 * If there is no attribute fork no ACL can exist on this inode,
1354 * and it can't have any file capabilities attached to it either.
1356 if (!XFS_IFORK_Q(ip)) {
1357 inode_has_no_xattr(inode);
1358 cache_no_acl(inode);
1364 struct xfs_inode *ip)
1366 struct inode *inode = &ip->i_vnode;
1368 switch (inode->i_mode & S_IFMT) {
1370 inode->i_op = &xfs_inode_operations;
1371 inode->i_fop = &xfs_file_operations;
1373 inode->i_mapping->a_ops = &xfs_dax_aops;
1375 inode->i_mapping->a_ops = &xfs_address_space_operations;
1378 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1379 inode->i_op = &xfs_dir_ci_inode_operations;
1381 inode->i_op = &xfs_dir_inode_operations;
1382 inode->i_fop = &xfs_dir_file_operations;
1385 if (ip->i_df.if_flags & XFS_IFINLINE)
1386 inode->i_op = &xfs_inline_symlink_inode_operations;
1388 inode->i_op = &xfs_symlink_inode_operations;
1391 inode->i_op = &xfs_inode_operations;
1392 init_special_inode(inode, inode->i_mode, inode->i_rdev);