2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_mount.h"
25 #include "xfs_da_format.h"
26 #include "xfs_inode.h"
28 #include "xfs_bmap_util.h"
30 #include "xfs_quota.h"
31 #include "xfs_error.h"
33 #include "xfs_trans.h"
34 #include "xfs_trace.h"
35 #include "xfs_icache.h"
36 #include "xfs_symlink.h"
37 #include "xfs_da_btree.h"
39 #include "xfs_trans_space.h"
42 #include <linux/capability.h>
43 #include <linux/xattr.h>
44 #include <linux/namei.h>
45 #include <linux/posix_acl.h>
46 #include <linux/security.h>
47 #include <linux/fiemap.h>
48 #include <linux/slab.h>
51 * Directories have different lock order w.r.t. mmap_sem compared to regular
52 * files. This is due to readdir potentially triggering page faults on a user
53 * buffer inside filldir(), and this happens with the ilock on the directory
54 * held. For regular files, the lock order is the other way around - the
55 * mmap_sem is taken during the page fault, and then we lock the ilock to do
56 * block mapping. Hence we need a different class for the directory ilock so
57 * that lockdep can tell them apart.
59 static struct lock_class_key xfs_nondir_ilock_class;
60 static struct lock_class_key xfs_dir_ilock_class;
65 const struct xattr *xattr_array,
68 const struct xattr *xattr;
69 struct xfs_inode *ip = XFS_I(inode);
72 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
73 error = xfs_attr_set(ip, xattr->name, xattr->value,
74 xattr->value_len, ATTR_SECURE);
82 * Hook in SELinux. This is not quite correct yet, what we really need
83 * here (as we do for default ACLs) is a mechanism by which creation of
84 * these attrs can be journalled at inode creation time (along with the
85 * inode, of course, such that log replay can't cause these to be lost).
92 const struct qstr *qstr)
94 return security_inode_init_security(inode, dir, qstr,
95 &xfs_initxattrs, NULL);
100 struct xfs_name *namep,
101 struct dentry *dentry,
104 namep->name = dentry->d_name.name;
105 namep->len = dentry->d_name.len;
106 namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT];
113 struct dentry *dentry)
115 struct xfs_name teardown;
118 * If we can't add the ACL or we fail in
119 * xfs_init_security we must back out.
120 * ENOSPC can hit here, among other things.
122 xfs_dentry_to_name(&teardown, dentry, 0);
124 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
130 struct dentry *dentry,
133 bool tmpfile) /* unnamed file */
136 struct xfs_inode *ip = NULL;
137 struct posix_acl *default_acl, *acl;
138 struct xfs_name name;
142 * Irix uses Missed'em'V split, but doesn't want to see
143 * the upper 5 bits of (14bit) major.
145 if (S_ISCHR(mode) || S_ISBLK(mode)) {
146 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
148 rdev = sysv_encode_dev(rdev);
153 error = posix_acl_create(dir, &mode, &default_acl, &acl);
158 xfs_dentry_to_name(&name, dentry, mode);
159 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
161 error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip);
168 error = xfs_init_security(inode, dir, &dentry->d_name);
170 goto out_cleanup_inode;
172 #ifdef CONFIG_XFS_POSIX_ACL
174 error = xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
176 goto out_cleanup_inode;
179 error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
181 goto out_cleanup_inode;
186 d_tmpfile(dentry, inode);
188 d_instantiate(dentry, inode);
192 posix_acl_release(default_acl);
194 posix_acl_release(acl);
199 xfs_cleanup_inode(dir, inode, dentry);
207 struct dentry *dentry,
211 return xfs_generic_create(dir, dentry, mode, rdev, false);
217 struct dentry *dentry,
221 return xfs_vn_mknod(dir, dentry, mode, 0);
227 struct dentry *dentry,
230 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
233 STATIC struct dentry *
236 struct dentry *dentry,
239 struct xfs_inode *cip;
240 struct xfs_name name;
243 if (dentry->d_name.len >= MAXNAMELEN)
244 return ERR_PTR(-ENAMETOOLONG);
246 xfs_dentry_to_name(&name, dentry, 0);
247 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
248 if (unlikely(error)) {
249 if (unlikely(error != -ENOENT))
250 return ERR_PTR(error);
255 return d_splice_alias(VFS_I(cip), dentry);
258 STATIC struct dentry *
261 struct dentry *dentry,
264 struct xfs_inode *ip;
265 struct xfs_name xname;
266 struct xfs_name ci_name;
270 if (dentry->d_name.len >= MAXNAMELEN)
271 return ERR_PTR(-ENAMETOOLONG);
273 xfs_dentry_to_name(&xname, dentry, 0);
274 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
275 if (unlikely(error)) {
276 if (unlikely(error != -ENOENT))
277 return ERR_PTR(error);
279 * call d_add(dentry, NULL) here when d_drop_negative_children
280 * is called in xfs_vn_mknod (ie. allow negative dentries
281 * with CI filesystems).
286 /* if exact match, just splice and exit */
288 return d_splice_alias(VFS_I(ip), dentry);
290 /* else case-insensitive match... */
291 dname.name = ci_name.name;
292 dname.len = ci_name.len;
293 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
294 kmem_free(ci_name.name);
300 struct dentry *old_dentry,
302 struct dentry *dentry)
304 struct inode *inode = d_inode(old_dentry);
305 struct xfs_name name;
308 xfs_dentry_to_name(&name, dentry, inode->i_mode);
310 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
315 d_instantiate(dentry, inode);
322 struct dentry *dentry)
324 struct xfs_name name;
327 xfs_dentry_to_name(&name, dentry, 0);
329 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
334 * With unlink, the VFS makes the dentry "negative": no inode,
335 * but still hashed. This is incompatible with case-insensitive
336 * mode, so invalidate (unhash) the dentry in CI-mode.
338 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
339 d_invalidate(dentry);
346 struct dentry *dentry,
350 struct xfs_inode *cip = NULL;
351 struct xfs_name name;
356 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
357 xfs_dentry_to_name(&name, dentry, mode);
359 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
365 error = xfs_init_security(inode, dir, &dentry->d_name);
367 goto out_cleanup_inode;
369 d_instantiate(dentry, inode);
373 xfs_cleanup_inode(dir, inode, dentry);
382 struct dentry *odentry,
384 struct dentry *ndentry,
387 struct inode *new_inode = d_inode(ndentry);
389 struct xfs_name oname;
390 struct xfs_name nname;
392 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
395 /* if we are exchanging files, we need to set i_mode of both files */
396 if (flags & RENAME_EXCHANGE)
397 omode = d_inode(ndentry)->i_mode;
399 xfs_dentry_to_name(&oname, odentry, omode);
400 xfs_dentry_to_name(&nname, ndentry, d_inode(odentry)->i_mode);
402 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
404 new_inode ? XFS_I(new_inode) : NULL, flags);
408 * careful here - this function can get called recursively, so
409 * we need to be very careful about how much stack we use.
410 * uio is kmalloced for this reason...
414 struct dentry *dentry,
415 struct nameidata *nd)
420 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
424 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
428 nd_set_link(nd, link);
434 nd_set_link(nd, ERR_PTR(error));
440 struct vfsmount *mnt,
441 struct dentry *dentry,
444 struct inode *inode = d_inode(dentry);
445 struct xfs_inode *ip = XFS_I(inode);
446 struct xfs_mount *mp = ip->i_mount;
448 trace_xfs_getattr(ip);
450 if (XFS_FORCED_SHUTDOWN(mp))
453 stat->size = XFS_ISIZE(ip);
454 stat->dev = inode->i_sb->s_dev;
455 stat->mode = ip->i_d.di_mode;
456 stat->nlink = ip->i_d.di_nlink;
457 stat->uid = inode->i_uid;
458 stat->gid = inode->i_gid;
459 stat->ino = ip->i_ino;
460 stat->atime = inode->i_atime;
461 stat->mtime = inode->i_mtime;
462 stat->ctime = inode->i_ctime;
464 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
467 switch (inode->i_mode & S_IFMT) {
470 stat->blksize = BLKDEV_IOSIZE;
471 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
472 sysv_minor(ip->i_df.if_u2.if_rdev));
475 if (XFS_IS_REALTIME_INODE(ip)) {
477 * If the file blocks are being allocated from a
478 * realtime volume, then return the inode's realtime
479 * extent size or the realtime volume's extent size.
482 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
484 stat->blksize = xfs_preferred_iosize(mp);
494 struct xfs_inode *ip,
497 struct inode *inode = VFS_I(ip);
498 umode_t mode = iattr->ia_mode;
500 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
502 ip->i_d.di_mode &= S_IFMT;
503 ip->i_d.di_mode |= mode & ~S_IFMT;
505 inode->i_mode &= S_IFMT;
506 inode->i_mode |= mode & ~S_IFMT;
511 struct xfs_inode *ip,
514 struct inode *inode = VFS_I(ip);
516 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
518 if (iattr->ia_valid & ATTR_ATIME) {
519 inode->i_atime = iattr->ia_atime;
520 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
521 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
523 if (iattr->ia_valid & ATTR_CTIME) {
524 inode->i_ctime = iattr->ia_ctime;
525 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
526 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
528 if (iattr->ia_valid & ATTR_MTIME) {
529 inode->i_mtime = iattr->ia_mtime;
530 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
531 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
537 struct xfs_inode *ip,
541 xfs_mount_t *mp = ip->i_mount;
542 struct inode *inode = VFS_I(ip);
543 int mask = iattr->ia_valid;
546 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
547 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
548 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
549 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
551 trace_xfs_setattr(ip);
553 /* If acls are being inherited, we already have this checked */
554 if (!(flags & XFS_ATTR_NOACL)) {
555 if (mp->m_flags & XFS_MOUNT_RDONLY)
558 if (XFS_FORCED_SHUTDOWN(mp))
561 error = inode_change_ok(inode, iattr);
566 ASSERT((mask & ATTR_SIZE) == 0);
569 * If disk quotas is on, we make sure that the dquots do exist on disk,
570 * before we start any other transactions. Trying to do this later
571 * is messy. We don't care to take a readlock to look at the ids
572 * in inode here, because we can't hold it across the trans_reserve.
573 * If the IDs do change before we take the ilock, we're covered
574 * because the i_*dquot fields will get updated anyway.
576 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
579 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
581 qflags |= XFS_QMOPT_UQUOTA;
585 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
587 qflags |= XFS_QMOPT_GQUOTA;
593 * We take a reference when we initialize udqp and gdqp,
594 * so it is important that we never blindly double trip on
595 * the same variable. See xfs_create() for an example.
597 ASSERT(udqp == NULL);
598 ASSERT(gdqp == NULL);
599 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
600 xfs_kgid_to_gid(gid),
602 qflags, &udqp, &gdqp, NULL);
607 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
608 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
612 xfs_ilock(ip, XFS_ILOCK_EXCL);
615 * Change file ownership. Must be the owner or privileged.
617 if (mask & (ATTR_UID|ATTR_GID)) {
619 * These IDs could have changed since we last looked at them.
620 * But, we're assured that if the ownership did change
621 * while we didn't have the inode locked, inode's dquot(s)
622 * would have changed also.
626 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
627 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
630 * Do a quota reservation only if uid/gid is actually
633 if (XFS_IS_QUOTA_RUNNING(mp) &&
634 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
635 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
637 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
638 NULL, capable(CAP_FOWNER) ?
639 XFS_QMOPT_FORCE_RES : 0);
640 if (error) /* out of quota */
641 goto out_trans_cancel;
645 xfs_trans_ijoin(tp, ip, 0);
648 * Change file ownership. Must be the owner or privileged.
650 if (mask & (ATTR_UID|ATTR_GID)) {
652 * CAP_FSETID overrides the following restrictions:
654 * The set-user-ID and set-group-ID bits of a file will be
655 * cleared upon successful return from chown()
657 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
658 !capable(CAP_FSETID))
659 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
662 * Change the ownerships and register quota modifications
663 * in the transaction.
665 if (!uid_eq(iuid, uid)) {
666 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
667 ASSERT(mask & ATTR_UID);
669 olddquot1 = xfs_qm_vop_chown(tp, ip,
670 &ip->i_udquot, udqp);
672 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
675 if (!gid_eq(igid, gid)) {
676 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
677 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
678 !XFS_IS_PQUOTA_ON(mp));
679 ASSERT(mask & ATTR_GID);
681 olddquot2 = xfs_qm_vop_chown(tp, ip,
682 &ip->i_gdquot, gdqp);
684 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
689 if (mask & ATTR_MODE)
690 xfs_setattr_mode(ip, iattr);
691 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
692 xfs_setattr_time(ip, iattr);
694 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
696 XFS_STATS_INC(xs_ig_attrchg);
698 if (mp->m_flags & XFS_MOUNT_WSYNC)
699 xfs_trans_set_sync(tp);
700 error = xfs_trans_commit(tp, 0);
702 xfs_iunlock(ip, XFS_ILOCK_EXCL);
705 * Release any dquot(s) the inode had kept before chown.
707 xfs_qm_dqrele(olddquot1);
708 xfs_qm_dqrele(olddquot2);
716 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
717 * update. We could avoid this with linked transactions
718 * and passing down the transaction pointer all the way
719 * to attr_set. No previous user of the generic
720 * Posix ACL code seems to care about this issue either.
722 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
723 error = posix_acl_chmod(inode, inode->i_mode);
731 xfs_trans_cancel(tp, 0);
732 xfs_iunlock(ip, XFS_ILOCK_EXCL);
740 * Truncate file. Must have write permission and not be a directory.
744 struct xfs_inode *ip,
747 struct xfs_mount *mp = ip->i_mount;
748 struct inode *inode = VFS_I(ip);
749 xfs_off_t oldsize, newsize;
750 struct xfs_trans *tp;
753 uint commit_flags = 0;
754 bool did_zeroing = false;
756 trace_xfs_setattr(ip);
758 if (mp->m_flags & XFS_MOUNT_RDONLY)
761 if (XFS_FORCED_SHUTDOWN(mp))
764 error = inode_change_ok(inode, iattr);
768 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
769 ASSERT(S_ISREG(ip->i_d.di_mode));
770 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
771 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
773 oldsize = inode->i_size;
774 newsize = iattr->ia_size;
777 * Short circuit the truncate case for zero length files.
779 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
780 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
784 * Use the regular setattr path to update the timestamps.
786 iattr->ia_valid &= ~ATTR_SIZE;
787 return xfs_setattr_nonsize(ip, iattr, 0);
791 * Make sure that the dquots are attached to the inode.
793 error = xfs_qm_dqattach(ip, 0);
798 * File data changes must be complete before we start the transaction to
799 * modify the inode. This needs to be done before joining the inode to
800 * the transaction because the inode cannot be unlocked once it is a
801 * part of the transaction.
803 * Start with zeroing any data block beyond EOF that we may expose on
806 if (newsize > oldsize) {
807 error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
813 * We are going to log the inode size change in this transaction so
814 * any previous writes that are beyond the on disk EOF and the new
815 * EOF that have not been written out need to be written here. If we
816 * do not write the data out, we expose ourselves to the null files
817 * problem. Note that this includes any block zeroing we did above;
818 * otherwise those blocks may not be zeroed after a crash.
820 if (newsize > ip->i_d.di_size &&
821 (oldsize != ip->i_d.di_size || did_zeroing)) {
822 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
823 ip->i_d.di_size, newsize);
828 /* Now wait for all direct I/O to complete. */
829 inode_dio_wait(inode);
832 * Do all the page cache truncate work outside the transaction context
833 * as the "lock" order is page lock->log space reservation. i.e.
834 * locking pages inside the transaction can ABBA deadlock with
835 * writeback. We have to do the VFS inode size update before we truncate
836 * the pagecache, however, to avoid racing with page faults beyond the
837 * new EOF they are not serialised against truncate operations except by
838 * page locks and size updates.
840 * Hence we are in a situation where a truncate can fail with ENOMEM
841 * from xfs_trans_reserve(), but having already truncated the in-memory
842 * version of the file (i.e. made user visible changes). There's not
843 * much we can do about this, except to hope that the caller sees ENOMEM
844 * and retries the truncate operation.
846 error = block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
849 truncate_setsize(inode, newsize);
852 * The "we can't serialise against page faults" pain gets worse.
854 * If the file is mapped then we have to clean the page at the old EOF
855 * when extending the file. Extending the file can expose changes the
856 * underlying page mapping (e.g. from beyond EOF to a hole or
857 * unwritten), and so on the next attempt to write to that page we need
858 * to remap it for write. i.e. we need .page_mkwrite() to be called.
859 * Hence we need to clean the page to clean the pte and so a new write
860 * fault will be triggered appropriately.
862 * If we do it before we change the inode size, then we can race with a
863 * page fault that maps the page with exactly the same problem. If we do
864 * it after we change the file size, then a new page fault can come in
865 * and allocate space before we've run the rest of the truncate
866 * transaction. That's kinda grotesque, but it's better than have data
867 * over a hole, and so that's the lesser evil that has been chosen here.
869 * The real solution, however, is to have some mechanism for locking out
870 * page faults while a truncate is in progress.
872 if (newsize > oldsize && mapping_mapped(VFS_I(ip)->i_mapping)) {
873 error = filemap_write_and_wait_range(
874 VFS_I(ip)->i_mapping,
875 round_down(oldsize, PAGE_CACHE_SIZE),
876 round_up(oldsize, PAGE_CACHE_SIZE) - 1);
881 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
882 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
884 goto out_trans_cancel;
886 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
887 lock_flags |= XFS_ILOCK_EXCL;
888 xfs_ilock(ip, XFS_ILOCK_EXCL);
889 xfs_trans_ijoin(tp, ip, 0);
892 * Only change the c/mtime if we are changing the size or we are
893 * explicitly asked to change it. This handles the semantic difference
894 * between truncate() and ftruncate() as implemented in the VFS.
896 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
897 * special case where we need to update the times despite not having
898 * these flags set. For all other operations the VFS set these flags
899 * explicitly if it wants a timestamp update.
901 if (newsize != oldsize &&
902 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
903 iattr->ia_ctime = iattr->ia_mtime =
904 current_fs_time(inode->i_sb);
905 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
909 * The first thing we do is set the size to new_size permanently on
910 * disk. This way we don't have to worry about anyone ever being able
911 * to look at the data being freed even in the face of a crash.
912 * What we're getting around here is the case where we free a block, it
913 * is allocated to another file, it is written to, and then we crash.
914 * If the new data gets written to the file but the log buffers
915 * containing the free and reallocation don't, then we'd end up with
916 * garbage in the blocks being freed. As long as we make the new size
917 * permanent before actually freeing any blocks it doesn't matter if
918 * they get written to.
920 ip->i_d.di_size = newsize;
921 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
923 if (newsize <= oldsize) {
924 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
926 goto out_trans_abort;
929 * Truncated "down", so we're removing references to old data
930 * here - if we delay flushing for a long time, we expose
931 * ourselves unduly to the notorious NULL files problem. So,
932 * we mark this inode and flush it when the file is closed,
933 * and do not wait the usual (long) time for writeout.
935 xfs_iflags_set(ip, XFS_ITRUNCATED);
937 /* A truncate down always removes post-EOF blocks. */
938 xfs_inode_clear_eofblocks_tag(ip);
941 if (iattr->ia_valid & ATTR_MODE)
942 xfs_setattr_mode(ip, iattr);
943 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
944 xfs_setattr_time(ip, iattr);
946 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
948 XFS_STATS_INC(xs_ig_attrchg);
950 if (mp->m_flags & XFS_MOUNT_WSYNC)
951 xfs_trans_set_sync(tp);
953 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
956 xfs_iunlock(ip, lock_flags);
960 commit_flags |= XFS_TRANS_ABORT;
962 xfs_trans_cancel(tp, commit_flags);
968 struct dentry *dentry,
971 struct xfs_inode *ip = XFS_I(d_inode(dentry));
974 if (iattr->ia_valid & ATTR_SIZE) {
975 uint iolock = XFS_IOLOCK_EXCL;
977 xfs_ilock(ip, iolock);
978 error = xfs_break_layouts(d_inode(dentry), &iolock);
980 error = xfs_setattr_size(ip, iattr);
981 xfs_iunlock(ip, iolock);
983 error = xfs_setattr_nonsize(ip, iattr, 0);
992 struct timespec *now,
995 struct xfs_inode *ip = XFS_I(inode);
996 struct xfs_mount *mp = ip->i_mount;
997 struct xfs_trans *tp;
1000 trace_xfs_update_time(ip);
1002 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
1003 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0);
1005 xfs_trans_cancel(tp, 0);
1009 xfs_ilock(ip, XFS_ILOCK_EXCL);
1010 if (flags & S_CTIME) {
1011 inode->i_ctime = *now;
1012 ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec;
1013 ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec;
1015 if (flags & S_MTIME) {
1016 inode->i_mtime = *now;
1017 ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec;
1018 ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec;
1020 if (flags & S_ATIME) {
1021 inode->i_atime = *now;
1022 ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec;
1023 ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec;
1025 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1026 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
1027 return xfs_trans_commit(tp, 0);
1030 #define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
1033 * Call fiemap helper to fill in user data.
1034 * Returns positive errors to xfs_getbmap.
1039 struct getbmapx *bmv,
1043 struct fiemap_extent_info *fieinfo = *arg;
1044 u32 fiemap_flags = 0;
1045 u64 logical, physical, length;
1047 /* Do nothing for a hole */
1048 if (bmv->bmv_block == -1LL)
1051 logical = BBTOB(bmv->bmv_offset);
1052 physical = BBTOB(bmv->bmv_block);
1053 length = BBTOB(bmv->bmv_length);
1055 if (bmv->bmv_oflags & BMV_OF_PREALLOC)
1056 fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
1057 else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
1058 fiemap_flags |= (FIEMAP_EXTENT_DELALLOC |
1059 FIEMAP_EXTENT_UNKNOWN);
1060 physical = 0; /* no block yet */
1062 if (bmv->bmv_oflags & BMV_OF_LAST)
1063 fiemap_flags |= FIEMAP_EXTENT_LAST;
1065 error = fiemap_fill_next_extent(fieinfo, logical, physical,
1066 length, fiemap_flags);
1069 *full = 1; /* user array now full */
1077 struct inode *inode,
1078 struct fiemap_extent_info *fieinfo,
1082 xfs_inode_t *ip = XFS_I(inode);
1086 error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
1090 /* Set up bmap header for xfs internal routine */
1091 bm.bmv_offset = BTOBBT(start);
1092 /* Special case for whole file */
1093 if (length == FIEMAP_MAX_OFFSET)
1094 bm.bmv_length = -1LL;
1096 bm.bmv_length = BTOBB(start + length) - bm.bmv_offset;
1098 /* We add one because in getbmap world count includes the header */
1099 bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
1100 fieinfo->fi_extents_max + 1;
1101 bm.bmv_count = min_t(__s32, bm.bmv_count,
1102 (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
1103 bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
1104 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
1105 bm.bmv_iflags |= BMV_IF_ATTRFORK;
1106 if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
1107 bm.bmv_iflags |= BMV_IF_DELALLOC;
1109 error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
1119 struct dentry *dentry,
1122 return xfs_generic_create(dir, dentry, mode, 0, true);
1125 static const struct inode_operations xfs_inode_operations = {
1126 .get_acl = xfs_get_acl,
1127 .set_acl = xfs_set_acl,
1128 .getattr = xfs_vn_getattr,
1129 .setattr = xfs_vn_setattr,
1130 .setxattr = generic_setxattr,
1131 .getxattr = generic_getxattr,
1132 .removexattr = generic_removexattr,
1133 .listxattr = xfs_vn_listxattr,
1134 .fiemap = xfs_vn_fiemap,
1135 .update_time = xfs_vn_update_time,
1138 static const struct inode_operations xfs_dir_inode_operations = {
1139 .create = xfs_vn_create,
1140 .lookup = xfs_vn_lookup,
1141 .link = xfs_vn_link,
1142 .unlink = xfs_vn_unlink,
1143 .symlink = xfs_vn_symlink,
1144 .mkdir = xfs_vn_mkdir,
1146 * Yes, XFS uses the same method for rmdir and unlink.
1148 * There are some subtile differences deeper in the code,
1149 * but we use S_ISDIR to check for those.
1151 .rmdir = xfs_vn_unlink,
1152 .mknod = xfs_vn_mknod,
1153 .rename2 = xfs_vn_rename,
1154 .get_acl = xfs_get_acl,
1155 .set_acl = xfs_set_acl,
1156 .getattr = xfs_vn_getattr,
1157 .setattr = xfs_vn_setattr,
1158 .setxattr = generic_setxattr,
1159 .getxattr = generic_getxattr,
1160 .removexattr = generic_removexattr,
1161 .listxattr = xfs_vn_listxattr,
1162 .update_time = xfs_vn_update_time,
1163 .tmpfile = xfs_vn_tmpfile,
1166 static const struct inode_operations xfs_dir_ci_inode_operations = {
1167 .create = xfs_vn_create,
1168 .lookup = xfs_vn_ci_lookup,
1169 .link = xfs_vn_link,
1170 .unlink = xfs_vn_unlink,
1171 .symlink = xfs_vn_symlink,
1172 .mkdir = xfs_vn_mkdir,
1174 * Yes, XFS uses the same method for rmdir and unlink.
1176 * There are some subtile differences deeper in the code,
1177 * but we use S_ISDIR to check for those.
1179 .rmdir = xfs_vn_unlink,
1180 .mknod = xfs_vn_mknod,
1181 .rename2 = xfs_vn_rename,
1182 .get_acl = xfs_get_acl,
1183 .set_acl = xfs_set_acl,
1184 .getattr = xfs_vn_getattr,
1185 .setattr = xfs_vn_setattr,
1186 .setxattr = generic_setxattr,
1187 .getxattr = generic_getxattr,
1188 .removexattr = generic_removexattr,
1189 .listxattr = xfs_vn_listxattr,
1190 .update_time = xfs_vn_update_time,
1191 .tmpfile = xfs_vn_tmpfile,
1194 static const struct inode_operations xfs_symlink_inode_operations = {
1195 .readlink = generic_readlink,
1196 .follow_link = xfs_vn_follow_link,
1197 .put_link = kfree_put_link,
1198 .getattr = xfs_vn_getattr,
1199 .setattr = xfs_vn_setattr,
1200 .setxattr = generic_setxattr,
1201 .getxattr = generic_getxattr,
1202 .removexattr = generic_removexattr,
1203 .listxattr = xfs_vn_listxattr,
1204 .update_time = xfs_vn_update_time,
1208 xfs_diflags_to_iflags(
1209 struct inode *inode,
1210 struct xfs_inode *ip)
1212 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
1213 inode->i_flags |= S_IMMUTABLE;
1215 inode->i_flags &= ~S_IMMUTABLE;
1216 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
1217 inode->i_flags |= S_APPEND;
1219 inode->i_flags &= ~S_APPEND;
1220 if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
1221 inode->i_flags |= S_SYNC;
1223 inode->i_flags &= ~S_SYNC;
1224 if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
1225 inode->i_flags |= S_NOATIME;
1227 inode->i_flags &= ~S_NOATIME;
1231 * Initialize the Linux inode, set up the operation vectors and
1234 * When reading existing inodes from disk this is called directly
1235 * from xfs_iget, when creating a new inode it is called from
1236 * xfs_ialloc after setting up the inode.
1238 * We are always called with an uninitialised linux inode here.
1239 * We need to initialise the necessary fields and take a reference
1244 struct xfs_inode *ip)
1246 struct inode *inode = &ip->i_vnode;
1249 inode->i_ino = ip->i_ino;
1250 inode->i_state = I_NEW;
1252 inode_sb_list_add(inode);
1253 /* make the inode look hashed for the writeback code */
1254 hlist_add_fake(&inode->i_hash);
1256 inode->i_mode = ip->i_d.di_mode;
1257 set_nlink(inode, ip->i_d.di_nlink);
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 switch (inode->i_mode & S_IFMT) {
1265 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
1266 sysv_minor(ip->i_df.if_u2.if_rdev));
1273 inode->i_generation = ip->i_d.di_gen;
1274 i_size_write(inode, ip->i_d.di_size);
1275 inode->i_atime.tv_sec = ip->i_d.di_atime.t_sec;
1276 inode->i_atime.tv_nsec = ip->i_d.di_atime.t_nsec;
1277 inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
1278 inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
1279 inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
1280 inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
1281 xfs_diflags_to_iflags(inode, ip);
1283 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1284 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1285 switch (inode->i_mode & S_IFMT) {
1287 inode->i_op = &xfs_inode_operations;
1288 inode->i_fop = &xfs_file_operations;
1289 inode->i_mapping->a_ops = &xfs_address_space_operations;
1292 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1293 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1294 inode->i_op = &xfs_dir_ci_inode_operations;
1296 inode->i_op = &xfs_dir_inode_operations;
1297 inode->i_fop = &xfs_dir_file_operations;
1298 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1301 inode->i_op = &xfs_symlink_inode_operations;
1302 if (!(ip->i_df.if_flags & XFS_IFINLINE))
1303 inode->i_mapping->a_ops = &xfs_address_space_operations;
1306 inode->i_op = &xfs_inode_operations;
1307 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1312 * Ensure all page cache allocations are done from GFP_NOFS context to
1313 * prevent direct reclaim recursion back into the filesystem and blowing
1314 * stacks or deadlocking.
1316 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1317 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1320 * If there is no attribute fork no ACL can exist on this inode,
1321 * and it can't have any file capabilities attached to it either.
1323 if (!XFS_IFORK_Q(ip)) {
1324 inode_has_no_xattr(inode);
1325 cache_no_acl(inode);
1328 xfs_iflags_clear(ip, XFS_INEW);
1331 unlock_new_inode(inode);