Loading...
1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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.
8 *
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.
13 *
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
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
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_sb.h"
25#include "xfs_ag.h"
26#include "xfs_mount.h"
27#include "xfs_da_format.h"
28#include "xfs_inode.h"
29#include "xfs_bmap.h"
30#include "xfs_bmap_util.h"
31#include "xfs_acl.h"
32#include "xfs_quota.h"
33#include "xfs_error.h"
34#include "xfs_attr.h"
35#include "xfs_trans.h"
36#include "xfs_trace.h"
37#include "xfs_icache.h"
38#include "xfs_symlink.h"
39#include "xfs_da_btree.h"
40#include "xfs_dir2_priv.h"
41#include "xfs_dinode.h"
42#include "xfs_trans_space.h"
43
44#include <linux/capability.h>
45#include <linux/xattr.h>
46#include <linux/namei.h>
47#include <linux/posix_acl.h>
48#include <linux/security.h>
49#include <linux/fiemap.h>
50#include <linux/slab.h>
51
52/*
53 * Directories have different lock order w.r.t. mmap_sem compared to regular
54 * files. This is due to readdir potentially triggering page faults on a user
55 * buffer inside filldir(), and this happens with the ilock on the directory
56 * held. For regular files, the lock order is the other way around - the
57 * mmap_sem is taken during the page fault, and then we lock the ilock to do
58 * block mapping. Hence we need a different class for the directory ilock so
59 * that lockdep can tell them apart.
60 */
61static struct lock_class_key xfs_nondir_ilock_class;
62static struct lock_class_key xfs_dir_ilock_class;
63
64static int
65xfs_initxattrs(
66 struct inode *inode,
67 const struct xattr *xattr_array,
68 void *fs_info)
69{
70 const struct xattr *xattr;
71 struct xfs_inode *ip = XFS_I(inode);
72 int error = 0;
73
74 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
75 error = -xfs_attr_set(ip, xattr->name, xattr->value,
76 xattr->value_len, ATTR_SECURE);
77 if (error < 0)
78 break;
79 }
80 return error;
81}
82
83/*
84 * Hook in SELinux. This is not quite correct yet, what we really need
85 * here (as we do for default ACLs) is a mechanism by which creation of
86 * these attrs can be journalled at inode creation time (along with the
87 * inode, of course, such that log replay can't cause these to be lost).
88 */
89
90STATIC int
91xfs_init_security(
92 struct inode *inode,
93 struct inode *dir,
94 const struct qstr *qstr)
95{
96 return -security_inode_init_security(inode, dir, qstr,
97 &xfs_initxattrs, NULL);
98}
99
100static void
101xfs_dentry_to_name(
102 struct xfs_name *namep,
103 struct dentry *dentry,
104 int mode)
105{
106 namep->name = dentry->d_name.name;
107 namep->len = dentry->d_name.len;
108 namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT];
109}
110
111STATIC void
112xfs_cleanup_inode(
113 struct inode *dir,
114 struct inode *inode,
115 struct dentry *dentry)
116{
117 struct xfs_name teardown;
118
119 /* Oh, the horror.
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.
123 */
124 xfs_dentry_to_name(&teardown, dentry, 0);
125
126 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
127}
128
129STATIC int
130xfs_generic_create(
131 struct inode *dir,
132 struct dentry *dentry,
133 umode_t mode,
134 dev_t rdev,
135 bool tmpfile) /* unnamed file */
136{
137 struct inode *inode;
138 struct xfs_inode *ip = NULL;
139 struct posix_acl *default_acl, *acl;
140 struct xfs_name name;
141 int error;
142
143 /*
144 * Irix uses Missed'em'V split, but doesn't want to see
145 * the upper 5 bits of (14bit) major.
146 */
147 if (S_ISCHR(mode) || S_ISBLK(mode)) {
148 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
149 return -EINVAL;
150 rdev = sysv_encode_dev(rdev);
151 } else {
152 rdev = 0;
153 }
154
155 error = posix_acl_create(dir, &mode, &default_acl, &acl);
156 if (error)
157 return error;
158
159 if (!tmpfile) {
160 xfs_dentry_to_name(&name, dentry, mode);
161 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
162 } else {
163 error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip);
164 }
165 if (unlikely(error))
166 goto out_free_acl;
167
168 inode = VFS_I(ip);
169
170 error = xfs_init_security(inode, dir, &dentry->d_name);
171 if (unlikely(error))
172 goto out_cleanup_inode;
173
174#ifdef CONFIG_XFS_POSIX_ACL
175 if (default_acl) {
176 error = -xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
177 if (error)
178 goto out_cleanup_inode;
179 }
180 if (acl) {
181 error = -xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
182 if (error)
183 goto out_cleanup_inode;
184 }
185#endif
186
187 if (tmpfile)
188 d_tmpfile(dentry, inode);
189 else
190 d_instantiate(dentry, inode);
191
192 out_free_acl:
193 if (default_acl)
194 posix_acl_release(default_acl);
195 if (acl)
196 posix_acl_release(acl);
197 return -error;
198
199 out_cleanup_inode:
200 if (!tmpfile)
201 xfs_cleanup_inode(dir, inode, dentry);
202 iput(inode);
203 goto out_free_acl;
204}
205
206STATIC int
207xfs_vn_mknod(
208 struct inode *dir,
209 struct dentry *dentry,
210 umode_t mode,
211 dev_t rdev)
212{
213 return xfs_generic_create(dir, dentry, mode, rdev, false);
214}
215
216STATIC int
217xfs_vn_create(
218 struct inode *dir,
219 struct dentry *dentry,
220 umode_t mode,
221 bool flags)
222{
223 return xfs_vn_mknod(dir, dentry, mode, 0);
224}
225
226STATIC int
227xfs_vn_mkdir(
228 struct inode *dir,
229 struct dentry *dentry,
230 umode_t mode)
231{
232 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
233}
234
235STATIC struct dentry *
236xfs_vn_lookup(
237 struct inode *dir,
238 struct dentry *dentry,
239 unsigned int flags)
240{
241 struct xfs_inode *cip;
242 struct xfs_name name;
243 int error;
244
245 if (dentry->d_name.len >= MAXNAMELEN)
246 return ERR_PTR(-ENAMETOOLONG);
247
248 xfs_dentry_to_name(&name, dentry, 0);
249 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
250 if (unlikely(error)) {
251 if (unlikely(error != ENOENT))
252 return ERR_PTR(-error);
253 d_add(dentry, NULL);
254 return NULL;
255 }
256
257 return d_splice_alias(VFS_I(cip), dentry);
258}
259
260STATIC struct dentry *
261xfs_vn_ci_lookup(
262 struct inode *dir,
263 struct dentry *dentry,
264 unsigned int flags)
265{
266 struct xfs_inode *ip;
267 struct xfs_name xname;
268 struct xfs_name ci_name;
269 struct qstr dname;
270 int error;
271
272 if (dentry->d_name.len >= MAXNAMELEN)
273 return ERR_PTR(-ENAMETOOLONG);
274
275 xfs_dentry_to_name(&xname, dentry, 0);
276 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
277 if (unlikely(error)) {
278 if (unlikely(error != ENOENT))
279 return ERR_PTR(-error);
280 /*
281 * call d_add(dentry, NULL) here when d_drop_negative_children
282 * is called in xfs_vn_mknod (ie. allow negative dentries
283 * with CI filesystems).
284 */
285 return NULL;
286 }
287
288 /* if exact match, just splice and exit */
289 if (!ci_name.name)
290 return d_splice_alias(VFS_I(ip), dentry);
291
292 /* else case-insensitive match... */
293 dname.name = ci_name.name;
294 dname.len = ci_name.len;
295 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
296 kmem_free(ci_name.name);
297 return dentry;
298}
299
300STATIC int
301xfs_vn_link(
302 struct dentry *old_dentry,
303 struct inode *dir,
304 struct dentry *dentry)
305{
306 struct inode *inode = old_dentry->d_inode;
307 struct xfs_name name;
308 int error;
309
310 xfs_dentry_to_name(&name, dentry, inode->i_mode);
311
312 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
313 if (unlikely(error))
314 return -error;
315
316 ihold(inode);
317 d_instantiate(dentry, inode);
318 return 0;
319}
320
321STATIC int
322xfs_vn_unlink(
323 struct inode *dir,
324 struct dentry *dentry)
325{
326 struct xfs_name name;
327 int error;
328
329 xfs_dentry_to_name(&name, dentry, 0);
330
331 error = -xfs_remove(XFS_I(dir), &name, XFS_I(dentry->d_inode));
332 if (error)
333 return error;
334
335 /*
336 * With unlink, the VFS makes the dentry "negative": no inode,
337 * but still hashed. This is incompatible with case-insensitive
338 * mode, so invalidate (unhash) the dentry in CI-mode.
339 */
340 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
341 d_invalidate(dentry);
342 return 0;
343}
344
345STATIC int
346xfs_vn_symlink(
347 struct inode *dir,
348 struct dentry *dentry,
349 const char *symname)
350{
351 struct inode *inode;
352 struct xfs_inode *cip = NULL;
353 struct xfs_name name;
354 int error;
355 umode_t mode;
356
357 mode = S_IFLNK |
358 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
359 xfs_dentry_to_name(&name, dentry, mode);
360
361 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
362 if (unlikely(error))
363 goto out;
364
365 inode = VFS_I(cip);
366
367 error = xfs_init_security(inode, dir, &dentry->d_name);
368 if (unlikely(error))
369 goto out_cleanup_inode;
370
371 d_instantiate(dentry, inode);
372 return 0;
373
374 out_cleanup_inode:
375 xfs_cleanup_inode(dir, inode, dentry);
376 iput(inode);
377 out:
378 return -error;
379}
380
381STATIC int
382xfs_vn_rename(
383 struct inode *odir,
384 struct dentry *odentry,
385 struct inode *ndir,
386 struct dentry *ndentry)
387{
388 struct inode *new_inode = ndentry->d_inode;
389 struct xfs_name oname;
390 struct xfs_name nname;
391
392 xfs_dentry_to_name(&oname, odentry, 0);
393 xfs_dentry_to_name(&nname, ndentry, odentry->d_inode->i_mode);
394
395 return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode),
396 XFS_I(ndir), &nname, new_inode ?
397 XFS_I(new_inode) : NULL);
398}
399
400/*
401 * careful here - this function can get called recursively, so
402 * we need to be very careful about how much stack we use.
403 * uio is kmalloced for this reason...
404 */
405STATIC void *
406xfs_vn_follow_link(
407 struct dentry *dentry,
408 struct nameidata *nd)
409{
410 char *link;
411 int error = -ENOMEM;
412
413 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
414 if (!link)
415 goto out_err;
416
417 error = -xfs_readlink(XFS_I(dentry->d_inode), link);
418 if (unlikely(error))
419 goto out_kfree;
420
421 nd_set_link(nd, link);
422 return NULL;
423
424 out_kfree:
425 kfree(link);
426 out_err:
427 nd_set_link(nd, ERR_PTR(error));
428 return NULL;
429}
430
431STATIC int
432xfs_vn_getattr(
433 struct vfsmount *mnt,
434 struct dentry *dentry,
435 struct kstat *stat)
436{
437 struct inode *inode = dentry->d_inode;
438 struct xfs_inode *ip = XFS_I(inode);
439 struct xfs_mount *mp = ip->i_mount;
440
441 trace_xfs_getattr(ip);
442
443 if (XFS_FORCED_SHUTDOWN(mp))
444 return -XFS_ERROR(EIO);
445
446 stat->size = XFS_ISIZE(ip);
447 stat->dev = inode->i_sb->s_dev;
448 stat->mode = ip->i_d.di_mode;
449 stat->nlink = ip->i_d.di_nlink;
450 stat->uid = inode->i_uid;
451 stat->gid = inode->i_gid;
452 stat->ino = ip->i_ino;
453 stat->atime = inode->i_atime;
454 stat->mtime = inode->i_mtime;
455 stat->ctime = inode->i_ctime;
456 stat->blocks =
457 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
458
459
460 switch (inode->i_mode & S_IFMT) {
461 case S_IFBLK:
462 case S_IFCHR:
463 stat->blksize = BLKDEV_IOSIZE;
464 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
465 sysv_minor(ip->i_df.if_u2.if_rdev));
466 break;
467 default:
468 if (XFS_IS_REALTIME_INODE(ip)) {
469 /*
470 * If the file blocks are being allocated from a
471 * realtime volume, then return the inode's realtime
472 * extent size or the realtime volume's extent size.
473 */
474 stat->blksize =
475 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
476 } else
477 stat->blksize = xfs_preferred_iosize(mp);
478 stat->rdev = 0;
479 break;
480 }
481
482 return 0;
483}
484
485static void
486xfs_setattr_mode(
487 struct xfs_inode *ip,
488 struct iattr *iattr)
489{
490 struct inode *inode = VFS_I(ip);
491 umode_t mode = iattr->ia_mode;
492
493 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
494
495 ip->i_d.di_mode &= S_IFMT;
496 ip->i_d.di_mode |= mode & ~S_IFMT;
497
498 inode->i_mode &= S_IFMT;
499 inode->i_mode |= mode & ~S_IFMT;
500}
501
502static void
503xfs_setattr_time(
504 struct xfs_inode *ip,
505 struct iattr *iattr)
506{
507 struct inode *inode = VFS_I(ip);
508
509 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
510
511 if (iattr->ia_valid & ATTR_ATIME) {
512 inode->i_atime = iattr->ia_atime;
513 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
514 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
515 }
516 if (iattr->ia_valid & ATTR_CTIME) {
517 inode->i_ctime = iattr->ia_ctime;
518 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
519 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
520 }
521 if (iattr->ia_valid & ATTR_MTIME) {
522 inode->i_mtime = iattr->ia_mtime;
523 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
524 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
525 }
526}
527
528int
529xfs_setattr_nonsize(
530 struct xfs_inode *ip,
531 struct iattr *iattr,
532 int flags)
533{
534 xfs_mount_t *mp = ip->i_mount;
535 struct inode *inode = VFS_I(ip);
536 int mask = iattr->ia_valid;
537 xfs_trans_t *tp;
538 int error;
539 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
540 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
541 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
542 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
543
544 trace_xfs_setattr(ip);
545
546 /* If acls are being inherited, we already have this checked */
547 if (!(flags & XFS_ATTR_NOACL)) {
548 if (mp->m_flags & XFS_MOUNT_RDONLY)
549 return XFS_ERROR(EROFS);
550
551 if (XFS_FORCED_SHUTDOWN(mp))
552 return XFS_ERROR(EIO);
553
554 error = -inode_change_ok(inode, iattr);
555 if (error)
556 return XFS_ERROR(error);
557 }
558
559 ASSERT((mask & ATTR_SIZE) == 0);
560
561 /*
562 * If disk quotas is on, we make sure that the dquots do exist on disk,
563 * before we start any other transactions. Trying to do this later
564 * is messy. We don't care to take a readlock to look at the ids
565 * in inode here, because we can't hold it across the trans_reserve.
566 * If the IDs do change before we take the ilock, we're covered
567 * because the i_*dquot fields will get updated anyway.
568 */
569 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
570 uint qflags = 0;
571
572 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
573 uid = iattr->ia_uid;
574 qflags |= XFS_QMOPT_UQUOTA;
575 } else {
576 uid = inode->i_uid;
577 }
578 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
579 gid = iattr->ia_gid;
580 qflags |= XFS_QMOPT_GQUOTA;
581 } else {
582 gid = inode->i_gid;
583 }
584
585 /*
586 * We take a reference when we initialize udqp and gdqp,
587 * so it is important that we never blindly double trip on
588 * the same variable. See xfs_create() for an example.
589 */
590 ASSERT(udqp == NULL);
591 ASSERT(gdqp == NULL);
592 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
593 xfs_kgid_to_gid(gid),
594 xfs_get_projid(ip),
595 qflags, &udqp, &gdqp, NULL);
596 if (error)
597 return error;
598 }
599
600 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
601 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
602 if (error)
603 goto out_dqrele;
604
605 xfs_ilock(ip, XFS_ILOCK_EXCL);
606
607 /*
608 * Change file ownership. Must be the owner or privileged.
609 */
610 if (mask & (ATTR_UID|ATTR_GID)) {
611 /*
612 * These IDs could have changed since we last looked at them.
613 * But, we're assured that if the ownership did change
614 * while we didn't have the inode locked, inode's dquot(s)
615 * would have changed also.
616 */
617 iuid = inode->i_uid;
618 igid = inode->i_gid;
619 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
620 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
621
622 /*
623 * Do a quota reservation only if uid/gid is actually
624 * going to change.
625 */
626 if (XFS_IS_QUOTA_RUNNING(mp) &&
627 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
628 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
629 ASSERT(tp);
630 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
631 NULL, capable(CAP_FOWNER) ?
632 XFS_QMOPT_FORCE_RES : 0);
633 if (error) /* out of quota */
634 goto out_trans_cancel;
635 }
636 }
637
638 xfs_trans_ijoin(tp, ip, 0);
639
640 /*
641 * Change file ownership. Must be the owner or privileged.
642 */
643 if (mask & (ATTR_UID|ATTR_GID)) {
644 /*
645 * CAP_FSETID overrides the following restrictions:
646 *
647 * The set-user-ID and set-group-ID bits of a file will be
648 * cleared upon successful return from chown()
649 */
650 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
651 !capable(CAP_FSETID))
652 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
653
654 /*
655 * Change the ownerships and register quota modifications
656 * in the transaction.
657 */
658 if (!uid_eq(iuid, uid)) {
659 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
660 ASSERT(mask & ATTR_UID);
661 ASSERT(udqp);
662 olddquot1 = xfs_qm_vop_chown(tp, ip,
663 &ip->i_udquot, udqp);
664 }
665 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
666 inode->i_uid = uid;
667 }
668 if (!gid_eq(igid, gid)) {
669 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
670 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
671 !XFS_IS_PQUOTA_ON(mp));
672 ASSERT(mask & ATTR_GID);
673 ASSERT(gdqp);
674 olddquot2 = xfs_qm_vop_chown(tp, ip,
675 &ip->i_gdquot, gdqp);
676 }
677 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
678 inode->i_gid = gid;
679 }
680 }
681
682 if (mask & ATTR_MODE)
683 xfs_setattr_mode(ip, iattr);
684 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
685 xfs_setattr_time(ip, iattr);
686
687 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
688
689 XFS_STATS_INC(xs_ig_attrchg);
690
691 if (mp->m_flags & XFS_MOUNT_WSYNC)
692 xfs_trans_set_sync(tp);
693 error = xfs_trans_commit(tp, 0);
694
695 xfs_iunlock(ip, XFS_ILOCK_EXCL);
696
697 /*
698 * Release any dquot(s) the inode had kept before chown.
699 */
700 xfs_qm_dqrele(olddquot1);
701 xfs_qm_dqrele(olddquot2);
702 xfs_qm_dqrele(udqp);
703 xfs_qm_dqrele(gdqp);
704
705 if (error)
706 return XFS_ERROR(error);
707
708 /*
709 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
710 * update. We could avoid this with linked transactions
711 * and passing down the transaction pointer all the way
712 * to attr_set. No previous user of the generic
713 * Posix ACL code seems to care about this issue either.
714 */
715 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
716 error = -posix_acl_chmod(inode, inode->i_mode);
717 if (error)
718 return XFS_ERROR(error);
719 }
720
721 return 0;
722
723out_trans_cancel:
724 xfs_trans_cancel(tp, 0);
725 xfs_iunlock(ip, XFS_ILOCK_EXCL);
726out_dqrele:
727 xfs_qm_dqrele(udqp);
728 xfs_qm_dqrele(gdqp);
729 return error;
730}
731
732/*
733 * Truncate file. Must have write permission and not be a directory.
734 */
735int
736xfs_setattr_size(
737 struct xfs_inode *ip,
738 struct iattr *iattr)
739{
740 struct xfs_mount *mp = ip->i_mount;
741 struct inode *inode = VFS_I(ip);
742 xfs_off_t oldsize, newsize;
743 struct xfs_trans *tp;
744 int error;
745 uint lock_flags = 0;
746 uint commit_flags = 0;
747
748 trace_xfs_setattr(ip);
749
750 if (mp->m_flags & XFS_MOUNT_RDONLY)
751 return XFS_ERROR(EROFS);
752
753 if (XFS_FORCED_SHUTDOWN(mp))
754 return XFS_ERROR(EIO);
755
756 error = -inode_change_ok(inode, iattr);
757 if (error)
758 return XFS_ERROR(error);
759
760 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
761 ASSERT(S_ISREG(ip->i_d.di_mode));
762 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
763 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
764
765 oldsize = inode->i_size;
766 newsize = iattr->ia_size;
767
768 /*
769 * Short circuit the truncate case for zero length files.
770 */
771 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
772 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
773 return 0;
774
775 /*
776 * Use the regular setattr path to update the timestamps.
777 */
778 iattr->ia_valid &= ~ATTR_SIZE;
779 return xfs_setattr_nonsize(ip, iattr, 0);
780 }
781
782 /*
783 * Make sure that the dquots are attached to the inode.
784 */
785 error = xfs_qm_dqattach(ip, 0);
786 if (error)
787 return error;
788
789 /*
790 * Now we can make the changes. Before we join the inode to the
791 * transaction, take care of the part of the truncation that must be
792 * done without the inode lock. This needs to be done before joining
793 * the inode to the transaction, because the inode cannot be unlocked
794 * once it is a part of the transaction.
795 */
796 if (newsize > oldsize) {
797 /*
798 * Do the first part of growing a file: zero any data in the
799 * last block that is beyond the old EOF. We need to do this
800 * before the inode is joined to the transaction to modify
801 * i_size.
802 */
803 error = xfs_zero_eof(ip, newsize, oldsize);
804 if (error)
805 return error;
806 }
807
808 /*
809 * We are going to log the inode size change in this transaction so
810 * any previous writes that are beyond the on disk EOF and the new
811 * EOF that have not been written out need to be written here. If we
812 * do not write the data out, we expose ourselves to the null files
813 * problem.
814 *
815 * Only flush from the on disk size to the smaller of the in memory
816 * file size or the new size as that's the range we really care about
817 * here and prevents waiting for other data not within the range we
818 * care about here.
819 */
820 if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) {
821 error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
822 ip->i_d.di_size, newsize);
823 if (error)
824 return error;
825 }
826
827 /*
828 * Wait for all direct I/O to complete.
829 */
830 inode_dio_wait(inode);
831
832 error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
833 if (error)
834 return error;
835
836 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
837 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
838 if (error)
839 goto out_trans_cancel;
840
841 truncate_setsize(inode, newsize);
842
843 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
844 lock_flags |= XFS_ILOCK_EXCL;
845
846 xfs_ilock(ip, XFS_ILOCK_EXCL);
847
848 xfs_trans_ijoin(tp, ip, 0);
849
850 /*
851 * Only change the c/mtime if we are changing the size or we are
852 * explicitly asked to change it. This handles the semantic difference
853 * between truncate() and ftruncate() as implemented in the VFS.
854 *
855 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
856 * special case where we need to update the times despite not having
857 * these flags set. For all other operations the VFS set these flags
858 * explicitly if it wants a timestamp update.
859 */
860 if (newsize != oldsize &&
861 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
862 iattr->ia_ctime = iattr->ia_mtime =
863 current_fs_time(inode->i_sb);
864 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
865 }
866
867 /*
868 * The first thing we do is set the size to new_size permanently on
869 * disk. This way we don't have to worry about anyone ever being able
870 * to look at the data being freed even in the face of a crash.
871 * What we're getting around here is the case where we free a block, it
872 * is allocated to another file, it is written to, and then we crash.
873 * If the new data gets written to the file but the log buffers
874 * containing the free and reallocation don't, then we'd end up with
875 * garbage in the blocks being freed. As long as we make the new size
876 * permanent before actually freeing any blocks it doesn't matter if
877 * they get written to.
878 */
879 ip->i_d.di_size = newsize;
880 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
881
882 if (newsize <= oldsize) {
883 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
884 if (error)
885 goto out_trans_abort;
886
887 /*
888 * Truncated "down", so we're removing references to old data
889 * here - if we delay flushing for a long time, we expose
890 * ourselves unduly to the notorious NULL files problem. So,
891 * we mark this inode and flush it when the file is closed,
892 * and do not wait the usual (long) time for writeout.
893 */
894 xfs_iflags_set(ip, XFS_ITRUNCATED);
895
896 /* A truncate down always removes post-EOF blocks. */
897 xfs_inode_clear_eofblocks_tag(ip);
898 }
899
900 if (iattr->ia_valid & ATTR_MODE)
901 xfs_setattr_mode(ip, iattr);
902 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
903 xfs_setattr_time(ip, iattr);
904
905 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
906
907 XFS_STATS_INC(xs_ig_attrchg);
908
909 if (mp->m_flags & XFS_MOUNT_WSYNC)
910 xfs_trans_set_sync(tp);
911
912 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
913out_unlock:
914 if (lock_flags)
915 xfs_iunlock(ip, lock_flags);
916 return error;
917
918out_trans_abort:
919 commit_flags |= XFS_TRANS_ABORT;
920out_trans_cancel:
921 xfs_trans_cancel(tp, commit_flags);
922 goto out_unlock;
923}
924
925STATIC int
926xfs_vn_setattr(
927 struct dentry *dentry,
928 struct iattr *iattr)
929{
930 struct xfs_inode *ip = XFS_I(dentry->d_inode);
931 int error;
932
933 if (iattr->ia_valid & ATTR_SIZE) {
934 xfs_ilock(ip, XFS_IOLOCK_EXCL);
935 error = xfs_setattr_size(ip, iattr);
936 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
937 } else {
938 error = xfs_setattr_nonsize(ip, iattr, 0);
939 }
940
941 return -error;
942}
943
944STATIC int
945xfs_vn_update_time(
946 struct inode *inode,
947 struct timespec *now,
948 int flags)
949{
950 struct xfs_inode *ip = XFS_I(inode);
951 struct xfs_mount *mp = ip->i_mount;
952 struct xfs_trans *tp;
953 int error;
954
955 trace_xfs_update_time(ip);
956
957 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
958 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0);
959 if (error) {
960 xfs_trans_cancel(tp, 0);
961 return -error;
962 }
963
964 xfs_ilock(ip, XFS_ILOCK_EXCL);
965 if (flags & S_CTIME) {
966 inode->i_ctime = *now;
967 ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec;
968 ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec;
969 }
970 if (flags & S_MTIME) {
971 inode->i_mtime = *now;
972 ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec;
973 ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec;
974 }
975 if (flags & S_ATIME) {
976 inode->i_atime = *now;
977 ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec;
978 ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec;
979 }
980 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
981 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
982 return -xfs_trans_commit(tp, 0);
983}
984
985#define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
986
987/*
988 * Call fiemap helper to fill in user data.
989 * Returns positive errors to xfs_getbmap.
990 */
991STATIC int
992xfs_fiemap_format(
993 void **arg,
994 struct getbmapx *bmv,
995 int *full)
996{
997 int error;
998 struct fiemap_extent_info *fieinfo = *arg;
999 u32 fiemap_flags = 0;
1000 u64 logical, physical, length;
1001
1002 /* Do nothing for a hole */
1003 if (bmv->bmv_block == -1LL)
1004 return 0;
1005
1006 logical = BBTOB(bmv->bmv_offset);
1007 physical = BBTOB(bmv->bmv_block);
1008 length = BBTOB(bmv->bmv_length);
1009
1010 if (bmv->bmv_oflags & BMV_OF_PREALLOC)
1011 fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
1012 else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
1013 fiemap_flags |= (FIEMAP_EXTENT_DELALLOC |
1014 FIEMAP_EXTENT_UNKNOWN);
1015 physical = 0; /* no block yet */
1016 }
1017 if (bmv->bmv_oflags & BMV_OF_LAST)
1018 fiemap_flags |= FIEMAP_EXTENT_LAST;
1019
1020 error = fiemap_fill_next_extent(fieinfo, logical, physical,
1021 length, fiemap_flags);
1022 if (error > 0) {
1023 error = 0;
1024 *full = 1; /* user array now full */
1025 }
1026
1027 return -error;
1028}
1029
1030STATIC int
1031xfs_vn_fiemap(
1032 struct inode *inode,
1033 struct fiemap_extent_info *fieinfo,
1034 u64 start,
1035 u64 length)
1036{
1037 xfs_inode_t *ip = XFS_I(inode);
1038 struct getbmapx bm;
1039 int error;
1040
1041 error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
1042 if (error)
1043 return error;
1044
1045 /* Set up bmap header for xfs internal routine */
1046 bm.bmv_offset = BTOBB(start);
1047 /* Special case for whole file */
1048 if (length == FIEMAP_MAX_OFFSET)
1049 bm.bmv_length = -1LL;
1050 else
1051 bm.bmv_length = BTOBB(length);
1052
1053 /* We add one because in getbmap world count includes the header */
1054 bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
1055 fieinfo->fi_extents_max + 1;
1056 bm.bmv_count = min_t(__s32, bm.bmv_count,
1057 (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
1058 bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
1059 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
1060 bm.bmv_iflags |= BMV_IF_ATTRFORK;
1061 if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
1062 bm.bmv_iflags |= BMV_IF_DELALLOC;
1063
1064 error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
1065 if (error)
1066 return -error;
1067
1068 return 0;
1069}
1070
1071STATIC int
1072xfs_vn_tmpfile(
1073 struct inode *dir,
1074 struct dentry *dentry,
1075 umode_t mode)
1076{
1077 return xfs_generic_create(dir, dentry, mode, 0, true);
1078}
1079
1080static const struct inode_operations xfs_inode_operations = {
1081 .get_acl = xfs_get_acl,
1082 .set_acl = xfs_set_acl,
1083 .getattr = xfs_vn_getattr,
1084 .setattr = xfs_vn_setattr,
1085 .setxattr = generic_setxattr,
1086 .getxattr = generic_getxattr,
1087 .removexattr = generic_removexattr,
1088 .listxattr = xfs_vn_listxattr,
1089 .fiemap = xfs_vn_fiemap,
1090 .update_time = xfs_vn_update_time,
1091};
1092
1093static const struct inode_operations xfs_dir_inode_operations = {
1094 .create = xfs_vn_create,
1095 .lookup = xfs_vn_lookup,
1096 .link = xfs_vn_link,
1097 .unlink = xfs_vn_unlink,
1098 .symlink = xfs_vn_symlink,
1099 .mkdir = xfs_vn_mkdir,
1100 /*
1101 * Yes, XFS uses the same method for rmdir and unlink.
1102 *
1103 * There are some subtile differences deeper in the code,
1104 * but we use S_ISDIR to check for those.
1105 */
1106 .rmdir = xfs_vn_unlink,
1107 .mknod = xfs_vn_mknod,
1108 .rename = xfs_vn_rename,
1109 .get_acl = xfs_get_acl,
1110 .set_acl = xfs_set_acl,
1111 .getattr = xfs_vn_getattr,
1112 .setattr = xfs_vn_setattr,
1113 .setxattr = generic_setxattr,
1114 .getxattr = generic_getxattr,
1115 .removexattr = generic_removexattr,
1116 .listxattr = xfs_vn_listxattr,
1117 .update_time = xfs_vn_update_time,
1118 .tmpfile = xfs_vn_tmpfile,
1119};
1120
1121static const struct inode_operations xfs_dir_ci_inode_operations = {
1122 .create = xfs_vn_create,
1123 .lookup = xfs_vn_ci_lookup,
1124 .link = xfs_vn_link,
1125 .unlink = xfs_vn_unlink,
1126 .symlink = xfs_vn_symlink,
1127 .mkdir = xfs_vn_mkdir,
1128 /*
1129 * Yes, XFS uses the same method for rmdir and unlink.
1130 *
1131 * There are some subtile differences deeper in the code,
1132 * but we use S_ISDIR to check for those.
1133 */
1134 .rmdir = xfs_vn_unlink,
1135 .mknod = xfs_vn_mknod,
1136 .rename = xfs_vn_rename,
1137 .get_acl = xfs_get_acl,
1138 .set_acl = xfs_set_acl,
1139 .getattr = xfs_vn_getattr,
1140 .setattr = xfs_vn_setattr,
1141 .setxattr = generic_setxattr,
1142 .getxattr = generic_getxattr,
1143 .removexattr = generic_removexattr,
1144 .listxattr = xfs_vn_listxattr,
1145 .update_time = xfs_vn_update_time,
1146 .tmpfile = xfs_vn_tmpfile,
1147};
1148
1149static const struct inode_operations xfs_symlink_inode_operations = {
1150 .readlink = generic_readlink,
1151 .follow_link = xfs_vn_follow_link,
1152 .put_link = kfree_put_link,
1153 .getattr = xfs_vn_getattr,
1154 .setattr = xfs_vn_setattr,
1155 .setxattr = generic_setxattr,
1156 .getxattr = generic_getxattr,
1157 .removexattr = generic_removexattr,
1158 .listxattr = xfs_vn_listxattr,
1159 .update_time = xfs_vn_update_time,
1160};
1161
1162STATIC void
1163xfs_diflags_to_iflags(
1164 struct inode *inode,
1165 struct xfs_inode *ip)
1166{
1167 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
1168 inode->i_flags |= S_IMMUTABLE;
1169 else
1170 inode->i_flags &= ~S_IMMUTABLE;
1171 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
1172 inode->i_flags |= S_APPEND;
1173 else
1174 inode->i_flags &= ~S_APPEND;
1175 if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
1176 inode->i_flags |= S_SYNC;
1177 else
1178 inode->i_flags &= ~S_SYNC;
1179 if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
1180 inode->i_flags |= S_NOATIME;
1181 else
1182 inode->i_flags &= ~S_NOATIME;
1183}
1184
1185/*
1186 * Initialize the Linux inode, set up the operation vectors and
1187 * unlock the inode.
1188 *
1189 * When reading existing inodes from disk this is called directly
1190 * from xfs_iget, when creating a new inode it is called from
1191 * xfs_ialloc after setting up the inode.
1192 *
1193 * We are always called with an uninitialised linux inode here.
1194 * We need to initialise the necessary fields and take a reference
1195 * on it.
1196 */
1197void
1198xfs_setup_inode(
1199 struct xfs_inode *ip)
1200{
1201 struct inode *inode = &ip->i_vnode;
1202 gfp_t gfp_mask;
1203
1204 inode->i_ino = ip->i_ino;
1205 inode->i_state = I_NEW;
1206
1207 inode_sb_list_add(inode);
1208 /* make the inode look hashed for the writeback code */
1209 hlist_add_fake(&inode->i_hash);
1210
1211 inode->i_mode = ip->i_d.di_mode;
1212 set_nlink(inode, ip->i_d.di_nlink);
1213 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1214 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1215
1216 switch (inode->i_mode & S_IFMT) {
1217 case S_IFBLK:
1218 case S_IFCHR:
1219 inode->i_rdev =
1220 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
1221 sysv_minor(ip->i_df.if_u2.if_rdev));
1222 break;
1223 default:
1224 inode->i_rdev = 0;
1225 break;
1226 }
1227
1228 inode->i_generation = ip->i_d.di_gen;
1229 i_size_write(inode, ip->i_d.di_size);
1230 inode->i_atime.tv_sec = ip->i_d.di_atime.t_sec;
1231 inode->i_atime.tv_nsec = ip->i_d.di_atime.t_nsec;
1232 inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
1233 inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
1234 inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
1235 inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
1236 xfs_diflags_to_iflags(inode, ip);
1237
1238 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1239 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1240 switch (inode->i_mode & S_IFMT) {
1241 case S_IFREG:
1242 inode->i_op = &xfs_inode_operations;
1243 inode->i_fop = &xfs_file_operations;
1244 inode->i_mapping->a_ops = &xfs_address_space_operations;
1245 break;
1246 case S_IFDIR:
1247 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1248 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1249 inode->i_op = &xfs_dir_ci_inode_operations;
1250 else
1251 inode->i_op = &xfs_dir_inode_operations;
1252 inode->i_fop = &xfs_dir_file_operations;
1253 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1254 break;
1255 case S_IFLNK:
1256 inode->i_op = &xfs_symlink_inode_operations;
1257 if (!(ip->i_df.if_flags & XFS_IFINLINE))
1258 inode->i_mapping->a_ops = &xfs_address_space_operations;
1259 break;
1260 default:
1261 inode->i_op = &xfs_inode_operations;
1262 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1263 break;
1264 }
1265
1266 /*
1267 * Ensure all page cache allocations are done from GFP_NOFS context to
1268 * prevent direct reclaim recursion back into the filesystem and blowing
1269 * stacks or deadlocking.
1270 */
1271 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1272 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1273
1274 /*
1275 * If there is no attribute fork no ACL can exist on this inode,
1276 * and it can't have any file capabilities attached to it either.
1277 */
1278 if (!XFS_IFORK_Q(ip)) {
1279 inode_has_no_xattr(inode);
1280 cache_no_acl(inode);
1281 }
1282
1283 xfs_iflags_clear(ip, XFS_INEW);
1284 barrier();
1285
1286 unlock_new_inode(inode);
1287}
1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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.
8 *
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.
13 *
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
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
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"
27#include "xfs_bmap.h"
28#include "xfs_bmap_util.h"
29#include "xfs_acl.h"
30#include "xfs_quota.h"
31#include "xfs_error.h"
32#include "xfs_attr.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"
38#include "xfs_dir2.h"
39#include "xfs_trans_space.h"
40#include "xfs_pnfs.h"
41
42#include <linux/capability.h>
43#include <linux/xattr.h>
44#include <linux/posix_acl.h>
45#include <linux/security.h>
46#include <linux/fiemap.h>
47#include <linux/slab.h>
48
49/*
50 * Directories have different lock order w.r.t. mmap_sem compared to regular
51 * files. This is due to readdir potentially triggering page faults on a user
52 * buffer inside filldir(), and this happens with the ilock on the directory
53 * held. For regular files, the lock order is the other way around - the
54 * mmap_sem is taken during the page fault, and then we lock the ilock to do
55 * block mapping. Hence we need a different class for the directory ilock so
56 * that lockdep can tell them apart.
57 */
58static struct lock_class_key xfs_nondir_ilock_class;
59static struct lock_class_key xfs_dir_ilock_class;
60
61static int
62xfs_initxattrs(
63 struct inode *inode,
64 const struct xattr *xattr_array,
65 void *fs_info)
66{
67 const struct xattr *xattr;
68 struct xfs_inode *ip = XFS_I(inode);
69 int error = 0;
70
71 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
72 error = xfs_attr_set(ip, xattr->name, xattr->value,
73 xattr->value_len, ATTR_SECURE);
74 if (error < 0)
75 break;
76 }
77 return error;
78}
79
80/*
81 * Hook in SELinux. This is not quite correct yet, what we really need
82 * here (as we do for default ACLs) is a mechanism by which creation of
83 * these attrs can be journalled at inode creation time (along with the
84 * inode, of course, such that log replay can't cause these to be lost).
85 */
86
87STATIC int
88xfs_init_security(
89 struct inode *inode,
90 struct inode *dir,
91 const struct qstr *qstr)
92{
93 return security_inode_init_security(inode, dir, qstr,
94 &xfs_initxattrs, NULL);
95}
96
97static void
98xfs_dentry_to_name(
99 struct xfs_name *namep,
100 struct dentry *dentry,
101 int mode)
102{
103 namep->name = dentry->d_name.name;
104 namep->len = dentry->d_name.len;
105 namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT];
106}
107
108STATIC void
109xfs_cleanup_inode(
110 struct inode *dir,
111 struct inode *inode,
112 struct dentry *dentry)
113{
114 struct xfs_name teardown;
115
116 /* Oh, the horror.
117 * If we can't add the ACL or we fail in
118 * xfs_init_security we must back out.
119 * ENOSPC can hit here, among other things.
120 */
121 xfs_dentry_to_name(&teardown, dentry, 0);
122
123 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
124}
125
126STATIC int
127xfs_generic_create(
128 struct inode *dir,
129 struct dentry *dentry,
130 umode_t mode,
131 dev_t rdev,
132 bool tmpfile) /* unnamed file */
133{
134 struct inode *inode;
135 struct xfs_inode *ip = NULL;
136 struct posix_acl *default_acl, *acl;
137 struct xfs_name name;
138 int error;
139
140 /*
141 * Irix uses Missed'em'V split, but doesn't want to see
142 * the upper 5 bits of (14bit) major.
143 */
144 if (S_ISCHR(mode) || S_ISBLK(mode)) {
145 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
146 return -EINVAL;
147 rdev = sysv_encode_dev(rdev);
148 } else {
149 rdev = 0;
150 }
151
152 error = posix_acl_create(dir, &mode, &default_acl, &acl);
153 if (error)
154 return error;
155
156 if (!tmpfile) {
157 xfs_dentry_to_name(&name, dentry, mode);
158 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
159 } else {
160 error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip);
161 }
162 if (unlikely(error))
163 goto out_free_acl;
164
165 inode = VFS_I(ip);
166
167 error = xfs_init_security(inode, dir, &dentry->d_name);
168 if (unlikely(error))
169 goto out_cleanup_inode;
170
171#ifdef CONFIG_XFS_POSIX_ACL
172 if (default_acl) {
173 error = xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
174 if (error)
175 goto out_cleanup_inode;
176 }
177 if (acl) {
178 error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
179 if (error)
180 goto out_cleanup_inode;
181 }
182#endif
183
184 if (tmpfile)
185 d_tmpfile(dentry, inode);
186 else
187 d_instantiate(dentry, inode);
188
189 xfs_finish_inode_setup(ip);
190
191 out_free_acl:
192 if (default_acl)
193 posix_acl_release(default_acl);
194 if (acl)
195 posix_acl_release(acl);
196 return error;
197
198 out_cleanup_inode:
199 xfs_finish_inode_setup(ip);
200 if (!tmpfile)
201 xfs_cleanup_inode(dir, inode, dentry);
202 iput(inode);
203 goto out_free_acl;
204}
205
206STATIC int
207xfs_vn_mknod(
208 struct inode *dir,
209 struct dentry *dentry,
210 umode_t mode,
211 dev_t rdev)
212{
213 return xfs_generic_create(dir, dentry, mode, rdev, false);
214}
215
216STATIC int
217xfs_vn_create(
218 struct inode *dir,
219 struct dentry *dentry,
220 umode_t mode,
221 bool flags)
222{
223 return xfs_vn_mknod(dir, dentry, mode, 0);
224}
225
226STATIC int
227xfs_vn_mkdir(
228 struct inode *dir,
229 struct dentry *dentry,
230 umode_t mode)
231{
232 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
233}
234
235STATIC struct dentry *
236xfs_vn_lookup(
237 struct inode *dir,
238 struct dentry *dentry,
239 unsigned int flags)
240{
241 struct xfs_inode *cip;
242 struct xfs_name name;
243 int error;
244
245 if (dentry->d_name.len >= MAXNAMELEN)
246 return ERR_PTR(-ENAMETOOLONG);
247
248 xfs_dentry_to_name(&name, dentry, 0);
249 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
250 if (unlikely(error)) {
251 if (unlikely(error != -ENOENT))
252 return ERR_PTR(error);
253 d_add(dentry, NULL);
254 return NULL;
255 }
256
257 return d_splice_alias(VFS_I(cip), dentry);
258}
259
260STATIC struct dentry *
261xfs_vn_ci_lookup(
262 struct inode *dir,
263 struct dentry *dentry,
264 unsigned int flags)
265{
266 struct xfs_inode *ip;
267 struct xfs_name xname;
268 struct xfs_name ci_name;
269 struct qstr dname;
270 int error;
271
272 if (dentry->d_name.len >= MAXNAMELEN)
273 return ERR_PTR(-ENAMETOOLONG);
274
275 xfs_dentry_to_name(&xname, dentry, 0);
276 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
277 if (unlikely(error)) {
278 if (unlikely(error != -ENOENT))
279 return ERR_PTR(error);
280 /*
281 * call d_add(dentry, NULL) here when d_drop_negative_children
282 * is called in xfs_vn_mknod (ie. allow negative dentries
283 * with CI filesystems).
284 */
285 return NULL;
286 }
287
288 /* if exact match, just splice and exit */
289 if (!ci_name.name)
290 return d_splice_alias(VFS_I(ip), dentry);
291
292 /* else case-insensitive match... */
293 dname.name = ci_name.name;
294 dname.len = ci_name.len;
295 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
296 kmem_free(ci_name.name);
297 return dentry;
298}
299
300STATIC int
301xfs_vn_link(
302 struct dentry *old_dentry,
303 struct inode *dir,
304 struct dentry *dentry)
305{
306 struct inode *inode = d_inode(old_dentry);
307 struct xfs_name name;
308 int error;
309
310 xfs_dentry_to_name(&name, dentry, inode->i_mode);
311
312 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
313 if (unlikely(error))
314 return error;
315
316 ihold(inode);
317 d_instantiate(dentry, inode);
318 return 0;
319}
320
321STATIC int
322xfs_vn_unlink(
323 struct inode *dir,
324 struct dentry *dentry)
325{
326 struct xfs_name name;
327 int error;
328
329 xfs_dentry_to_name(&name, dentry, 0);
330
331 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
332 if (error)
333 return error;
334
335 /*
336 * With unlink, the VFS makes the dentry "negative": no inode,
337 * but still hashed. This is incompatible with case-insensitive
338 * mode, so invalidate (unhash) the dentry in CI-mode.
339 */
340 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
341 d_invalidate(dentry);
342 return 0;
343}
344
345STATIC int
346xfs_vn_symlink(
347 struct inode *dir,
348 struct dentry *dentry,
349 const char *symname)
350{
351 struct inode *inode;
352 struct xfs_inode *cip = NULL;
353 struct xfs_name name;
354 int error;
355 umode_t mode;
356
357 mode = S_IFLNK |
358 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
359 xfs_dentry_to_name(&name, dentry, mode);
360
361 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
362 if (unlikely(error))
363 goto out;
364
365 inode = VFS_I(cip);
366
367 error = xfs_init_security(inode, dir, &dentry->d_name);
368 if (unlikely(error))
369 goto out_cleanup_inode;
370
371 d_instantiate(dentry, inode);
372 xfs_finish_inode_setup(cip);
373 return 0;
374
375 out_cleanup_inode:
376 xfs_finish_inode_setup(cip);
377 xfs_cleanup_inode(dir, inode, dentry);
378 iput(inode);
379 out:
380 return error;
381}
382
383STATIC int
384xfs_vn_rename(
385 struct inode *odir,
386 struct dentry *odentry,
387 struct inode *ndir,
388 struct dentry *ndentry,
389 unsigned int flags)
390{
391 struct inode *new_inode = d_inode(ndentry);
392 int omode = 0;
393 struct xfs_name oname;
394 struct xfs_name nname;
395
396 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
397 return -EINVAL;
398
399 /* if we are exchanging files, we need to set i_mode of both files */
400 if (flags & RENAME_EXCHANGE)
401 omode = d_inode(ndentry)->i_mode;
402
403 xfs_dentry_to_name(&oname, odentry, omode);
404 xfs_dentry_to_name(&nname, ndentry, d_inode(odentry)->i_mode);
405
406 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
407 XFS_I(ndir), &nname,
408 new_inode ? XFS_I(new_inode) : NULL, flags);
409}
410
411/*
412 * careful here - this function can get called recursively, so
413 * we need to be very careful about how much stack we use.
414 * uio is kmalloced for this reason...
415 */
416STATIC const char *
417xfs_vn_get_link(
418 struct dentry *dentry,
419 struct inode *inode,
420 struct delayed_call *done)
421{
422 char *link;
423 int error = -ENOMEM;
424
425 if (!dentry)
426 return ERR_PTR(-ECHILD);
427
428 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
429 if (!link)
430 goto out_err;
431
432 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
433 if (unlikely(error))
434 goto out_kfree;
435
436 set_delayed_call(done, kfree_link, link);
437 return link;
438
439 out_kfree:
440 kfree(link);
441 out_err:
442 return ERR_PTR(error);
443}
444
445STATIC int
446xfs_vn_getattr(
447 struct vfsmount *mnt,
448 struct dentry *dentry,
449 struct kstat *stat)
450{
451 struct inode *inode = d_inode(dentry);
452 struct xfs_inode *ip = XFS_I(inode);
453 struct xfs_mount *mp = ip->i_mount;
454
455 trace_xfs_getattr(ip);
456
457 if (XFS_FORCED_SHUTDOWN(mp))
458 return -EIO;
459
460 stat->size = XFS_ISIZE(ip);
461 stat->dev = inode->i_sb->s_dev;
462 stat->mode = inode->i_mode;
463 stat->nlink = inode->i_nlink;
464 stat->uid = inode->i_uid;
465 stat->gid = inode->i_gid;
466 stat->ino = ip->i_ino;
467 stat->atime = inode->i_atime;
468 stat->mtime = inode->i_mtime;
469 stat->ctime = inode->i_ctime;
470 stat->blocks =
471 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
472
473
474 switch (inode->i_mode & S_IFMT) {
475 case S_IFBLK:
476 case S_IFCHR:
477 stat->blksize = BLKDEV_IOSIZE;
478 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
479 sysv_minor(ip->i_df.if_u2.if_rdev));
480 break;
481 default:
482 if (XFS_IS_REALTIME_INODE(ip)) {
483 /*
484 * If the file blocks are being allocated from a
485 * realtime volume, then return the inode's realtime
486 * extent size or the realtime volume's extent size.
487 */
488 stat->blksize =
489 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
490 } else
491 stat->blksize = xfs_preferred_iosize(mp);
492 stat->rdev = 0;
493 break;
494 }
495
496 return 0;
497}
498
499static void
500xfs_setattr_mode(
501 struct xfs_inode *ip,
502 struct iattr *iattr)
503{
504 struct inode *inode = VFS_I(ip);
505 umode_t mode = iattr->ia_mode;
506
507 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
508
509 inode->i_mode &= S_IFMT;
510 inode->i_mode |= mode & ~S_IFMT;
511}
512
513void
514xfs_setattr_time(
515 struct xfs_inode *ip,
516 struct iattr *iattr)
517{
518 struct inode *inode = VFS_I(ip);
519
520 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
521
522 if (iattr->ia_valid & ATTR_ATIME)
523 inode->i_atime = iattr->ia_atime;
524 if (iattr->ia_valid & ATTR_CTIME)
525 inode->i_ctime = iattr->ia_ctime;
526 if (iattr->ia_valid & ATTR_MTIME)
527 inode->i_mtime = iattr->ia_mtime;
528}
529
530int
531xfs_setattr_nonsize(
532 struct xfs_inode *ip,
533 struct iattr *iattr,
534 int flags)
535{
536 xfs_mount_t *mp = ip->i_mount;
537 struct inode *inode = VFS_I(ip);
538 int mask = iattr->ia_valid;
539 xfs_trans_t *tp;
540 int error;
541 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
542 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
543 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
544 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
545
546 trace_xfs_setattr(ip);
547
548 /* If acls are being inherited, we already have this checked */
549 if (!(flags & XFS_ATTR_NOACL)) {
550 if (mp->m_flags & XFS_MOUNT_RDONLY)
551 return -EROFS;
552
553 if (XFS_FORCED_SHUTDOWN(mp))
554 return -EIO;
555
556 error = inode_change_ok(inode, iattr);
557 if (error)
558 return error;
559 }
560
561 ASSERT((mask & ATTR_SIZE) == 0);
562
563 /*
564 * If disk quotas is on, we make sure that the dquots do exist on disk,
565 * before we start any other transactions. Trying to do this later
566 * is messy. We don't care to take a readlock to look at the ids
567 * in inode here, because we can't hold it across the trans_reserve.
568 * If the IDs do change before we take the ilock, we're covered
569 * because the i_*dquot fields will get updated anyway.
570 */
571 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
572 uint qflags = 0;
573
574 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
575 uid = iattr->ia_uid;
576 qflags |= XFS_QMOPT_UQUOTA;
577 } else {
578 uid = inode->i_uid;
579 }
580 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
581 gid = iattr->ia_gid;
582 qflags |= XFS_QMOPT_GQUOTA;
583 } else {
584 gid = inode->i_gid;
585 }
586
587 /*
588 * We take a reference when we initialize udqp and gdqp,
589 * so it is important that we never blindly double trip on
590 * the same variable. See xfs_create() for an example.
591 */
592 ASSERT(udqp == NULL);
593 ASSERT(gdqp == NULL);
594 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
595 xfs_kgid_to_gid(gid),
596 xfs_get_projid(ip),
597 qflags, &udqp, &gdqp, NULL);
598 if (error)
599 return error;
600 }
601
602 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
603 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
604 if (error)
605 goto out_trans_cancel;
606
607 xfs_ilock(ip, XFS_ILOCK_EXCL);
608
609 /*
610 * Change file ownership. Must be the owner or privileged.
611 */
612 if (mask & (ATTR_UID|ATTR_GID)) {
613 /*
614 * These IDs could have changed since we last looked at them.
615 * But, we're assured that if the ownership did change
616 * while we didn't have the inode locked, inode's dquot(s)
617 * would have changed also.
618 */
619 iuid = inode->i_uid;
620 igid = inode->i_gid;
621 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
622 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
623
624 /*
625 * Do a quota reservation only if uid/gid is actually
626 * going to change.
627 */
628 if (XFS_IS_QUOTA_RUNNING(mp) &&
629 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
630 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
631 ASSERT(tp);
632 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
633 NULL, capable(CAP_FOWNER) ?
634 XFS_QMOPT_FORCE_RES : 0);
635 if (error) /* out of quota */
636 goto out_unlock;
637 }
638 }
639
640 xfs_trans_ijoin(tp, ip, 0);
641
642 /*
643 * Change file ownership. Must be the owner or privileged.
644 */
645 if (mask & (ATTR_UID|ATTR_GID)) {
646 /*
647 * CAP_FSETID overrides the following restrictions:
648 *
649 * The set-user-ID and set-group-ID bits of a file will be
650 * cleared upon successful return from chown()
651 */
652 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
653 !capable(CAP_FSETID))
654 inode->i_mode &= ~(S_ISUID|S_ISGID);
655
656 /*
657 * Change the ownerships and register quota modifications
658 * in the transaction.
659 */
660 if (!uid_eq(iuid, uid)) {
661 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
662 ASSERT(mask & ATTR_UID);
663 ASSERT(udqp);
664 olddquot1 = xfs_qm_vop_chown(tp, ip,
665 &ip->i_udquot, udqp);
666 }
667 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
668 inode->i_uid = uid;
669 }
670 if (!gid_eq(igid, gid)) {
671 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
672 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
673 !XFS_IS_PQUOTA_ON(mp));
674 ASSERT(mask & ATTR_GID);
675 ASSERT(gdqp);
676 olddquot2 = xfs_qm_vop_chown(tp, ip,
677 &ip->i_gdquot, gdqp);
678 }
679 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
680 inode->i_gid = gid;
681 }
682 }
683
684 if (mask & ATTR_MODE)
685 xfs_setattr_mode(ip, iattr);
686 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
687 xfs_setattr_time(ip, iattr);
688
689 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
690
691 XFS_STATS_INC(mp, xs_ig_attrchg);
692
693 if (mp->m_flags & XFS_MOUNT_WSYNC)
694 xfs_trans_set_sync(tp);
695 error = xfs_trans_commit(tp);
696
697 xfs_iunlock(ip, XFS_ILOCK_EXCL);
698
699 /*
700 * Release any dquot(s) the inode had kept before chown.
701 */
702 xfs_qm_dqrele(olddquot1);
703 xfs_qm_dqrele(olddquot2);
704 xfs_qm_dqrele(udqp);
705 xfs_qm_dqrele(gdqp);
706
707 if (error)
708 return error;
709
710 /*
711 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
712 * update. We could avoid this with linked transactions
713 * and passing down the transaction pointer all the way
714 * to attr_set. No previous user of the generic
715 * Posix ACL code seems to care about this issue either.
716 */
717 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
718 error = posix_acl_chmod(inode, inode->i_mode);
719 if (error)
720 return error;
721 }
722
723 return 0;
724
725out_unlock:
726 xfs_iunlock(ip, XFS_ILOCK_EXCL);
727out_trans_cancel:
728 xfs_trans_cancel(tp);
729 xfs_qm_dqrele(udqp);
730 xfs_qm_dqrele(gdqp);
731 return error;
732}
733
734/*
735 * Truncate file. Must have write permission and not be a directory.
736 */
737int
738xfs_setattr_size(
739 struct xfs_inode *ip,
740 struct iattr *iattr)
741{
742 struct xfs_mount *mp = ip->i_mount;
743 struct inode *inode = VFS_I(ip);
744 xfs_off_t oldsize, newsize;
745 struct xfs_trans *tp;
746 int error;
747 uint lock_flags = 0;
748 bool did_zeroing = false;
749
750 trace_xfs_setattr(ip);
751
752 if (mp->m_flags & XFS_MOUNT_RDONLY)
753 return -EROFS;
754
755 if (XFS_FORCED_SHUTDOWN(mp))
756 return -EIO;
757
758 error = inode_change_ok(inode, iattr);
759 if (error)
760 return error;
761
762 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
763 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
764 ASSERT(S_ISREG(inode->i_mode));
765 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
766 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
767
768 oldsize = inode->i_size;
769 newsize = iattr->ia_size;
770
771 /*
772 * Short circuit the truncate case for zero length files.
773 */
774 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
775 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
776 return 0;
777
778 /*
779 * Use the regular setattr path to update the timestamps.
780 */
781 iattr->ia_valid &= ~ATTR_SIZE;
782 return xfs_setattr_nonsize(ip, iattr, 0);
783 }
784
785 /*
786 * Make sure that the dquots are attached to the inode.
787 */
788 error = xfs_qm_dqattach(ip, 0);
789 if (error)
790 return error;
791
792 /*
793 * File data changes must be complete before we start the transaction to
794 * modify the inode. This needs to be done before joining the inode to
795 * the transaction because the inode cannot be unlocked once it is a
796 * part of the transaction.
797 *
798 * Start with zeroing any data block beyond EOF that we may expose on
799 * file extension.
800 */
801 if (newsize > oldsize) {
802 error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
803 if (error)
804 return error;
805 }
806
807 /*
808 * We are going to log the inode size change in this transaction so
809 * any previous writes that are beyond the on disk EOF and the new
810 * EOF that have not been written out need to be written here. If we
811 * do not write the data out, we expose ourselves to the null files
812 * problem. Note that this includes any block zeroing we did above;
813 * otherwise those blocks may not be zeroed after a crash.
814 */
815 if (newsize > ip->i_d.di_size &&
816 (oldsize != ip->i_d.di_size || did_zeroing)) {
817 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
818 ip->i_d.di_size, newsize);
819 if (error)
820 return error;
821 }
822
823 /* Now wait for all direct I/O to complete. */
824 inode_dio_wait(inode);
825
826 /*
827 * We've already locked out new page faults, so now we can safely remove
828 * pages from the page cache knowing they won't get refaulted until we
829 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
830 * complete. The truncate_setsize() call also cleans partial EOF page
831 * PTEs on extending truncates and hence ensures sub-page block size
832 * filesystems are correctly handled, too.
833 *
834 * We have to do all the page cache truncate work outside the
835 * transaction context as the "lock" order is page lock->log space
836 * reservation as defined by extent allocation in the writeback path.
837 * Hence a truncate can fail with ENOMEM from xfs_trans_reserve(), but
838 * having already truncated the in-memory version of the file (i.e. made
839 * user visible changes). There's not much we can do about this, except
840 * to hope that the caller sees ENOMEM and retries the truncate
841 * operation.
842 */
843 if (IS_DAX(inode))
844 error = dax_truncate_page(inode, newsize, xfs_get_blocks_direct);
845 else
846 error = block_truncate_page(inode->i_mapping, newsize,
847 xfs_get_blocks);
848 if (error)
849 return error;
850 truncate_setsize(inode, newsize);
851
852 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
853 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
854 if (error)
855 goto out_trans_cancel;
856
857 lock_flags |= XFS_ILOCK_EXCL;
858 xfs_ilock(ip, XFS_ILOCK_EXCL);
859 xfs_trans_ijoin(tp, ip, 0);
860
861 /*
862 * Only change the c/mtime if we are changing the size or we are
863 * explicitly asked to change it. This handles the semantic difference
864 * between truncate() and ftruncate() as implemented in the VFS.
865 *
866 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
867 * special case where we need to update the times despite not having
868 * these flags set. For all other operations the VFS set these flags
869 * explicitly if it wants a timestamp update.
870 */
871 if (newsize != oldsize &&
872 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
873 iattr->ia_ctime = iattr->ia_mtime =
874 current_fs_time(inode->i_sb);
875 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
876 }
877
878 /*
879 * The first thing we do is set the size to new_size permanently on
880 * disk. This way we don't have to worry about anyone ever being able
881 * to look at the data being freed even in the face of a crash.
882 * What we're getting around here is the case where we free a block, it
883 * is allocated to another file, it is written to, and then we crash.
884 * If the new data gets written to the file but the log buffers
885 * containing the free and reallocation don't, then we'd end up with
886 * garbage in the blocks being freed. As long as we make the new size
887 * permanent before actually freeing any blocks it doesn't matter if
888 * they get written to.
889 */
890 ip->i_d.di_size = newsize;
891 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
892
893 if (newsize <= oldsize) {
894 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
895 if (error)
896 goto out_trans_cancel;
897
898 /*
899 * Truncated "down", so we're removing references to old data
900 * here - if we delay flushing for a long time, we expose
901 * ourselves unduly to the notorious NULL files problem. So,
902 * we mark this inode and flush it when the file is closed,
903 * and do not wait the usual (long) time for writeout.
904 */
905 xfs_iflags_set(ip, XFS_ITRUNCATED);
906
907 /* A truncate down always removes post-EOF blocks. */
908 xfs_inode_clear_eofblocks_tag(ip);
909 }
910
911 if (iattr->ia_valid & ATTR_MODE)
912 xfs_setattr_mode(ip, iattr);
913 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
914 xfs_setattr_time(ip, iattr);
915
916 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
917
918 XFS_STATS_INC(mp, xs_ig_attrchg);
919
920 if (mp->m_flags & XFS_MOUNT_WSYNC)
921 xfs_trans_set_sync(tp);
922
923 error = xfs_trans_commit(tp);
924out_unlock:
925 if (lock_flags)
926 xfs_iunlock(ip, lock_flags);
927 return error;
928
929out_trans_cancel:
930 xfs_trans_cancel(tp);
931 goto out_unlock;
932}
933
934STATIC int
935xfs_vn_setattr(
936 struct dentry *dentry,
937 struct iattr *iattr)
938{
939 struct xfs_inode *ip = XFS_I(d_inode(dentry));
940 int error;
941
942 if (iattr->ia_valid & ATTR_SIZE) {
943 uint iolock = XFS_IOLOCK_EXCL;
944
945 xfs_ilock(ip, iolock);
946 error = xfs_break_layouts(d_inode(dentry), &iolock, true);
947 if (!error) {
948 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
949 iolock |= XFS_MMAPLOCK_EXCL;
950
951 error = xfs_setattr_size(ip, iattr);
952 }
953 xfs_iunlock(ip, iolock);
954 } else {
955 error = xfs_setattr_nonsize(ip, iattr, 0);
956 }
957
958 return error;
959}
960
961STATIC int
962xfs_vn_update_time(
963 struct inode *inode,
964 struct timespec *now,
965 int flags)
966{
967 struct xfs_inode *ip = XFS_I(inode);
968 struct xfs_mount *mp = ip->i_mount;
969 struct xfs_trans *tp;
970 int error;
971
972 trace_xfs_update_time(ip);
973
974 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
975 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0);
976 if (error) {
977 xfs_trans_cancel(tp);
978 return error;
979 }
980
981 xfs_ilock(ip, XFS_ILOCK_EXCL);
982 if (flags & S_CTIME)
983 inode->i_ctime = *now;
984 if (flags & S_MTIME)
985 inode->i_mtime = *now;
986 if (flags & S_ATIME)
987 inode->i_atime = *now;
988
989 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
990 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
991 return xfs_trans_commit(tp);
992}
993
994#define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
995
996/*
997 * Call fiemap helper to fill in user data.
998 * Returns positive errors to xfs_getbmap.
999 */
1000STATIC int
1001xfs_fiemap_format(
1002 void **arg,
1003 struct getbmapx *bmv,
1004 int *full)
1005{
1006 int error;
1007 struct fiemap_extent_info *fieinfo = *arg;
1008 u32 fiemap_flags = 0;
1009 u64 logical, physical, length;
1010
1011 /* Do nothing for a hole */
1012 if (bmv->bmv_block == -1LL)
1013 return 0;
1014
1015 logical = BBTOB(bmv->bmv_offset);
1016 physical = BBTOB(bmv->bmv_block);
1017 length = BBTOB(bmv->bmv_length);
1018
1019 if (bmv->bmv_oflags & BMV_OF_PREALLOC)
1020 fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
1021 else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
1022 fiemap_flags |= (FIEMAP_EXTENT_DELALLOC |
1023 FIEMAP_EXTENT_UNKNOWN);
1024 physical = 0; /* no block yet */
1025 }
1026 if (bmv->bmv_oflags & BMV_OF_LAST)
1027 fiemap_flags |= FIEMAP_EXTENT_LAST;
1028
1029 error = fiemap_fill_next_extent(fieinfo, logical, physical,
1030 length, fiemap_flags);
1031 if (error > 0) {
1032 error = 0;
1033 *full = 1; /* user array now full */
1034 }
1035
1036 return error;
1037}
1038
1039STATIC int
1040xfs_vn_fiemap(
1041 struct inode *inode,
1042 struct fiemap_extent_info *fieinfo,
1043 u64 start,
1044 u64 length)
1045{
1046 xfs_inode_t *ip = XFS_I(inode);
1047 struct getbmapx bm;
1048 int error;
1049
1050 error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
1051 if (error)
1052 return error;
1053
1054 /* Set up bmap header for xfs internal routine */
1055 bm.bmv_offset = BTOBBT(start);
1056 /* Special case for whole file */
1057 if (length == FIEMAP_MAX_OFFSET)
1058 bm.bmv_length = -1LL;
1059 else
1060 bm.bmv_length = BTOBB(start + length) - bm.bmv_offset;
1061
1062 /* We add one because in getbmap world count includes the header */
1063 bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
1064 fieinfo->fi_extents_max + 1;
1065 bm.bmv_count = min_t(__s32, bm.bmv_count,
1066 (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
1067 bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
1068 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
1069 bm.bmv_iflags |= BMV_IF_ATTRFORK;
1070 if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
1071 bm.bmv_iflags |= BMV_IF_DELALLOC;
1072
1073 error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
1074 if (error)
1075 return error;
1076
1077 return 0;
1078}
1079
1080STATIC int
1081xfs_vn_tmpfile(
1082 struct inode *dir,
1083 struct dentry *dentry,
1084 umode_t mode)
1085{
1086 return xfs_generic_create(dir, dentry, mode, 0, true);
1087}
1088
1089static const struct inode_operations xfs_inode_operations = {
1090 .get_acl = xfs_get_acl,
1091 .set_acl = xfs_set_acl,
1092 .getattr = xfs_vn_getattr,
1093 .setattr = xfs_vn_setattr,
1094 .setxattr = generic_setxattr,
1095 .getxattr = generic_getxattr,
1096 .removexattr = generic_removexattr,
1097 .listxattr = xfs_vn_listxattr,
1098 .fiemap = xfs_vn_fiemap,
1099 .update_time = xfs_vn_update_time,
1100};
1101
1102static const struct inode_operations xfs_dir_inode_operations = {
1103 .create = xfs_vn_create,
1104 .lookup = xfs_vn_lookup,
1105 .link = xfs_vn_link,
1106 .unlink = xfs_vn_unlink,
1107 .symlink = xfs_vn_symlink,
1108 .mkdir = xfs_vn_mkdir,
1109 /*
1110 * Yes, XFS uses the same method for rmdir and unlink.
1111 *
1112 * There are some subtile differences deeper in the code,
1113 * but we use S_ISDIR to check for those.
1114 */
1115 .rmdir = xfs_vn_unlink,
1116 .mknod = xfs_vn_mknod,
1117 .rename2 = xfs_vn_rename,
1118 .get_acl = xfs_get_acl,
1119 .set_acl = xfs_set_acl,
1120 .getattr = xfs_vn_getattr,
1121 .setattr = xfs_vn_setattr,
1122 .setxattr = generic_setxattr,
1123 .getxattr = generic_getxattr,
1124 .removexattr = generic_removexattr,
1125 .listxattr = xfs_vn_listxattr,
1126 .update_time = xfs_vn_update_time,
1127 .tmpfile = xfs_vn_tmpfile,
1128};
1129
1130static const struct inode_operations xfs_dir_ci_inode_operations = {
1131 .create = xfs_vn_create,
1132 .lookup = xfs_vn_ci_lookup,
1133 .link = xfs_vn_link,
1134 .unlink = xfs_vn_unlink,
1135 .symlink = xfs_vn_symlink,
1136 .mkdir = xfs_vn_mkdir,
1137 /*
1138 * Yes, XFS uses the same method for rmdir and unlink.
1139 *
1140 * There are some subtile differences deeper in the code,
1141 * but we use S_ISDIR to check for those.
1142 */
1143 .rmdir = xfs_vn_unlink,
1144 .mknod = xfs_vn_mknod,
1145 .rename2 = xfs_vn_rename,
1146 .get_acl = xfs_get_acl,
1147 .set_acl = xfs_set_acl,
1148 .getattr = xfs_vn_getattr,
1149 .setattr = xfs_vn_setattr,
1150 .setxattr = generic_setxattr,
1151 .getxattr = generic_getxattr,
1152 .removexattr = generic_removexattr,
1153 .listxattr = xfs_vn_listxattr,
1154 .update_time = xfs_vn_update_time,
1155 .tmpfile = xfs_vn_tmpfile,
1156};
1157
1158static const struct inode_operations xfs_symlink_inode_operations = {
1159 .readlink = generic_readlink,
1160 .get_link = xfs_vn_get_link,
1161 .getattr = xfs_vn_getattr,
1162 .setattr = xfs_vn_setattr,
1163 .setxattr = generic_setxattr,
1164 .getxattr = generic_getxattr,
1165 .removexattr = generic_removexattr,
1166 .listxattr = xfs_vn_listxattr,
1167 .update_time = xfs_vn_update_time,
1168};
1169
1170STATIC void
1171xfs_diflags_to_iflags(
1172 struct inode *inode,
1173 struct xfs_inode *ip)
1174{
1175 uint16_t flags = ip->i_d.di_flags;
1176
1177 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1178 S_NOATIME | S_DAX);
1179
1180 if (flags & XFS_DIFLAG_IMMUTABLE)
1181 inode->i_flags |= S_IMMUTABLE;
1182 if (flags & XFS_DIFLAG_APPEND)
1183 inode->i_flags |= S_APPEND;
1184 if (flags & XFS_DIFLAG_SYNC)
1185 inode->i_flags |= S_SYNC;
1186 if (flags & XFS_DIFLAG_NOATIME)
1187 inode->i_flags |= S_NOATIME;
1188 if (S_ISREG(inode->i_mode) &&
1189 ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE &&
1190 (ip->i_mount->m_flags & XFS_MOUNT_DAX ||
1191 ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1192 inode->i_flags |= S_DAX;
1193}
1194
1195/*
1196 * Initialize the Linux inode and set up the operation vectors.
1197 *
1198 * When reading existing inodes from disk this is called directly from xfs_iget,
1199 * when creating a new inode it is called from xfs_ialloc after setting up the
1200 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1201 * it up to the caller to deal with unlocking the inode appropriately.
1202 */
1203void
1204xfs_setup_inode(
1205 struct xfs_inode *ip)
1206{
1207 struct inode *inode = &ip->i_vnode;
1208 gfp_t gfp_mask;
1209
1210 inode->i_ino = ip->i_ino;
1211 inode->i_state = I_NEW;
1212
1213 inode_sb_list_add(inode);
1214 /* make the inode look hashed for the writeback code */
1215 hlist_add_fake(&inode->i_hash);
1216
1217 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1218 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1219
1220 switch (inode->i_mode & S_IFMT) {
1221 case S_IFBLK:
1222 case S_IFCHR:
1223 inode->i_rdev =
1224 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
1225 sysv_minor(ip->i_df.if_u2.if_rdev));
1226 break;
1227 default:
1228 inode->i_rdev = 0;
1229 break;
1230 }
1231
1232 i_size_write(inode, ip->i_d.di_size);
1233 xfs_diflags_to_iflags(inode, ip);
1234
1235 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1236 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1237 switch (inode->i_mode & S_IFMT) {
1238 case S_IFREG:
1239 inode->i_op = &xfs_inode_operations;
1240 inode->i_fop = &xfs_file_operations;
1241 inode->i_mapping->a_ops = &xfs_address_space_operations;
1242 break;
1243 case S_IFDIR:
1244 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1245 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1246 inode->i_op = &xfs_dir_ci_inode_operations;
1247 else
1248 inode->i_op = &xfs_dir_inode_operations;
1249 inode->i_fop = &xfs_dir_file_operations;
1250 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1251 break;
1252 case S_IFLNK:
1253 inode->i_op = &xfs_symlink_inode_operations;
1254 if (!(ip->i_df.if_flags & XFS_IFINLINE))
1255 inode->i_mapping->a_ops = &xfs_address_space_operations;
1256 break;
1257 default:
1258 inode->i_op = &xfs_inode_operations;
1259 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1260 break;
1261 }
1262
1263 /*
1264 * Ensure all page cache allocations are done from GFP_NOFS context to
1265 * prevent direct reclaim recursion back into the filesystem and blowing
1266 * stacks or deadlocking.
1267 */
1268 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1269 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1270
1271 /*
1272 * If there is no attribute fork no ACL can exist on this inode,
1273 * and it can't have any file capabilities attached to it either.
1274 */
1275 if (!XFS_IFORK_Q(ip)) {
1276 inode_has_no_xattr(inode);
1277 cache_no_acl(inode);
1278 }
1279}