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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}
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#include "xfs_iomap.h"
42
43#include <linux/capability.h>
44#include <linux/xattr.h>
45#include <linux/posix_acl.h>
46#include <linux/security.h>
47#include <linux/iomap.h>
48#include <linux/slab.h>
49#include <linux/iversion.h>
50
51/*
52 * Directories have different lock order w.r.t. mmap_sem compared to regular
53 * files. This is due to readdir potentially triggering page faults on a user
54 * buffer inside filldir(), and this happens with the ilock on the directory
55 * held. For regular files, the lock order is the other way around - the
56 * mmap_sem is taken during the page fault, and then we lock the ilock to do
57 * block mapping. Hence we need a different class for the directory ilock so
58 * that lockdep can tell them apart.
59 */
60static struct lock_class_key xfs_nondir_ilock_class;
61static struct lock_class_key xfs_dir_ilock_class;
62
63static int
64xfs_initxattrs(
65 struct inode *inode,
66 const struct xattr *xattr_array,
67 void *fs_info)
68{
69 const struct xattr *xattr;
70 struct xfs_inode *ip = XFS_I(inode);
71 int error = 0;
72
73 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
74 error = xfs_attr_set(ip, xattr->name, xattr->value,
75 xattr->value_len, ATTR_SECURE);
76 if (error < 0)
77 break;
78 }
79 return error;
80}
81
82/*
83 * Hook in SELinux. This is not quite correct yet, what we really need
84 * here (as we do for default ACLs) is a mechanism by which creation of
85 * these attrs can be journalled at inode creation time (along with the
86 * inode, of course, such that log replay can't cause these to be lost).
87 */
88
89STATIC int
90xfs_init_security(
91 struct inode *inode,
92 struct inode *dir,
93 const struct qstr *qstr)
94{
95 return security_inode_init_security(inode, dir, qstr,
96 &xfs_initxattrs, NULL);
97}
98
99static void
100xfs_dentry_to_name(
101 struct xfs_name *namep,
102 struct dentry *dentry)
103{
104 namep->name = dentry->d_name.name;
105 namep->len = dentry->d_name.len;
106 namep->type = XFS_DIR3_FT_UNKNOWN;
107}
108
109static int
110xfs_dentry_mode_to_name(
111 struct xfs_name *namep,
112 struct dentry *dentry,
113 int mode)
114{
115 namep->name = dentry->d_name.name;
116 namep->len = dentry->d_name.len;
117 namep->type = xfs_mode_to_ftype(mode);
118
119 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
120 return -EFSCORRUPTED;
121
122 return 0;
123}
124
125STATIC void
126xfs_cleanup_inode(
127 struct inode *dir,
128 struct inode *inode,
129 struct dentry *dentry)
130{
131 struct xfs_name teardown;
132
133 /* Oh, the horror.
134 * If we can't add the ACL or we fail in
135 * xfs_init_security we must back out.
136 * ENOSPC can hit here, among other things.
137 */
138 xfs_dentry_to_name(&teardown, dentry);
139
140 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
141}
142
143STATIC int
144xfs_generic_create(
145 struct inode *dir,
146 struct dentry *dentry,
147 umode_t mode,
148 dev_t rdev,
149 bool tmpfile) /* unnamed file */
150{
151 struct inode *inode;
152 struct xfs_inode *ip = NULL;
153 struct posix_acl *default_acl, *acl;
154 struct xfs_name name;
155 int error;
156
157 /*
158 * Irix uses Missed'em'V split, but doesn't want to see
159 * the upper 5 bits of (14bit) major.
160 */
161 if (S_ISCHR(mode) || S_ISBLK(mode)) {
162 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
163 return -EINVAL;
164 } else {
165 rdev = 0;
166 }
167
168 error = posix_acl_create(dir, &mode, &default_acl, &acl);
169 if (error)
170 return error;
171
172 /* Verify mode is valid also for tmpfile case */
173 error = xfs_dentry_mode_to_name(&name, dentry, mode);
174 if (unlikely(error))
175 goto out_free_acl;
176
177 if (!tmpfile) {
178 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
179 } else {
180 error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
181 }
182 if (unlikely(error))
183 goto out_free_acl;
184
185 inode = VFS_I(ip);
186
187 error = xfs_init_security(inode, dir, &dentry->d_name);
188 if (unlikely(error))
189 goto out_cleanup_inode;
190
191#ifdef CONFIG_XFS_POSIX_ACL
192 if (default_acl) {
193 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
194 if (error)
195 goto out_cleanup_inode;
196 }
197 if (acl) {
198 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
199 if (error)
200 goto out_cleanup_inode;
201 }
202#endif
203
204 xfs_setup_iops(ip);
205
206 if (tmpfile)
207 d_tmpfile(dentry, inode);
208 else
209 d_instantiate(dentry, inode);
210
211 xfs_finish_inode_setup(ip);
212
213 out_free_acl:
214 if (default_acl)
215 posix_acl_release(default_acl);
216 if (acl)
217 posix_acl_release(acl);
218 return error;
219
220 out_cleanup_inode:
221 xfs_finish_inode_setup(ip);
222 if (!tmpfile)
223 xfs_cleanup_inode(dir, inode, dentry);
224 iput(inode);
225 goto out_free_acl;
226}
227
228STATIC int
229xfs_vn_mknod(
230 struct inode *dir,
231 struct dentry *dentry,
232 umode_t mode,
233 dev_t rdev)
234{
235 return xfs_generic_create(dir, dentry, mode, rdev, false);
236}
237
238STATIC int
239xfs_vn_create(
240 struct inode *dir,
241 struct dentry *dentry,
242 umode_t mode,
243 bool flags)
244{
245 return xfs_vn_mknod(dir, dentry, mode, 0);
246}
247
248STATIC int
249xfs_vn_mkdir(
250 struct inode *dir,
251 struct dentry *dentry,
252 umode_t mode)
253{
254 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
255}
256
257STATIC struct dentry *
258xfs_vn_lookup(
259 struct inode *dir,
260 struct dentry *dentry,
261 unsigned int flags)
262{
263 struct xfs_inode *cip;
264 struct xfs_name name;
265 int error;
266
267 if (dentry->d_name.len >= MAXNAMELEN)
268 return ERR_PTR(-ENAMETOOLONG);
269
270 xfs_dentry_to_name(&name, dentry);
271 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
272 if (unlikely(error)) {
273 if (unlikely(error != -ENOENT))
274 return ERR_PTR(error);
275 d_add(dentry, NULL);
276 return NULL;
277 }
278
279 return d_splice_alias(VFS_I(cip), dentry);
280}
281
282STATIC struct dentry *
283xfs_vn_ci_lookup(
284 struct inode *dir,
285 struct dentry *dentry,
286 unsigned int flags)
287{
288 struct xfs_inode *ip;
289 struct xfs_name xname;
290 struct xfs_name ci_name;
291 struct qstr dname;
292 int error;
293
294 if (dentry->d_name.len >= MAXNAMELEN)
295 return ERR_PTR(-ENAMETOOLONG);
296
297 xfs_dentry_to_name(&xname, dentry);
298 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
299 if (unlikely(error)) {
300 if (unlikely(error != -ENOENT))
301 return ERR_PTR(error);
302 /*
303 * call d_add(dentry, NULL) here when d_drop_negative_children
304 * is called in xfs_vn_mknod (ie. allow negative dentries
305 * with CI filesystems).
306 */
307 return NULL;
308 }
309
310 /* if exact match, just splice and exit */
311 if (!ci_name.name)
312 return d_splice_alias(VFS_I(ip), dentry);
313
314 /* else case-insensitive match... */
315 dname.name = ci_name.name;
316 dname.len = ci_name.len;
317 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
318 kmem_free(ci_name.name);
319 return dentry;
320}
321
322STATIC int
323xfs_vn_link(
324 struct dentry *old_dentry,
325 struct inode *dir,
326 struct dentry *dentry)
327{
328 struct inode *inode = d_inode(old_dentry);
329 struct xfs_name name;
330 int error;
331
332 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
333 if (unlikely(error))
334 return error;
335
336 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
337 if (unlikely(error))
338 return error;
339
340 ihold(inode);
341 d_instantiate(dentry, inode);
342 return 0;
343}
344
345STATIC int
346xfs_vn_unlink(
347 struct inode *dir,
348 struct dentry *dentry)
349{
350 struct xfs_name name;
351 int error;
352
353 xfs_dentry_to_name(&name, dentry);
354
355 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
356 if (error)
357 return error;
358
359 /*
360 * With unlink, the VFS makes the dentry "negative": no inode,
361 * but still hashed. This is incompatible with case-insensitive
362 * mode, so invalidate (unhash) the dentry in CI-mode.
363 */
364 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
365 d_invalidate(dentry);
366 return 0;
367}
368
369STATIC int
370xfs_vn_symlink(
371 struct inode *dir,
372 struct dentry *dentry,
373 const char *symname)
374{
375 struct inode *inode;
376 struct xfs_inode *cip = NULL;
377 struct xfs_name name;
378 int error;
379 umode_t mode;
380
381 mode = S_IFLNK |
382 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
383 error = xfs_dentry_mode_to_name(&name, dentry, mode);
384 if (unlikely(error))
385 goto out;
386
387 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
388 if (unlikely(error))
389 goto out;
390
391 inode = VFS_I(cip);
392
393 error = xfs_init_security(inode, dir, &dentry->d_name);
394 if (unlikely(error))
395 goto out_cleanup_inode;
396
397 xfs_setup_iops(cip);
398
399 d_instantiate(dentry, inode);
400 xfs_finish_inode_setup(cip);
401 return 0;
402
403 out_cleanup_inode:
404 xfs_finish_inode_setup(cip);
405 xfs_cleanup_inode(dir, inode, dentry);
406 iput(inode);
407 out:
408 return error;
409}
410
411STATIC int
412xfs_vn_rename(
413 struct inode *odir,
414 struct dentry *odentry,
415 struct inode *ndir,
416 struct dentry *ndentry,
417 unsigned int flags)
418{
419 struct inode *new_inode = d_inode(ndentry);
420 int omode = 0;
421 int error;
422 struct xfs_name oname;
423 struct xfs_name nname;
424
425 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
426 return -EINVAL;
427
428 /* if we are exchanging files, we need to set i_mode of both files */
429 if (flags & RENAME_EXCHANGE)
430 omode = d_inode(ndentry)->i_mode;
431
432 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
433 if (omode && unlikely(error))
434 return error;
435
436 error = xfs_dentry_mode_to_name(&nname, ndentry,
437 d_inode(odentry)->i_mode);
438 if (unlikely(error))
439 return error;
440
441 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
442 XFS_I(ndir), &nname,
443 new_inode ? XFS_I(new_inode) : NULL, flags);
444}
445
446/*
447 * careful here - this function can get called recursively, so
448 * we need to be very careful about how much stack we use.
449 * uio is kmalloced for this reason...
450 */
451STATIC const char *
452xfs_vn_get_link(
453 struct dentry *dentry,
454 struct inode *inode,
455 struct delayed_call *done)
456{
457 char *link;
458 int error = -ENOMEM;
459
460 if (!dentry)
461 return ERR_PTR(-ECHILD);
462
463 link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
464 if (!link)
465 goto out_err;
466
467 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
468 if (unlikely(error))
469 goto out_kfree;
470
471 set_delayed_call(done, kfree_link, link);
472 return link;
473
474 out_kfree:
475 kfree(link);
476 out_err:
477 return ERR_PTR(error);
478}
479
480STATIC const char *
481xfs_vn_get_link_inline(
482 struct dentry *dentry,
483 struct inode *inode,
484 struct delayed_call *done)
485{
486 ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
487 return XFS_I(inode)->i_df.if_u1.if_data;
488}
489
490STATIC int
491xfs_vn_getattr(
492 const struct path *path,
493 struct kstat *stat,
494 u32 request_mask,
495 unsigned int query_flags)
496{
497 struct inode *inode = d_inode(path->dentry);
498 struct xfs_inode *ip = XFS_I(inode);
499 struct xfs_mount *mp = ip->i_mount;
500
501 trace_xfs_getattr(ip);
502
503 if (XFS_FORCED_SHUTDOWN(mp))
504 return -EIO;
505
506 stat->size = XFS_ISIZE(ip);
507 stat->dev = inode->i_sb->s_dev;
508 stat->mode = inode->i_mode;
509 stat->nlink = inode->i_nlink;
510 stat->uid = inode->i_uid;
511 stat->gid = inode->i_gid;
512 stat->ino = ip->i_ino;
513 stat->atime = inode->i_atime;
514 stat->mtime = inode->i_mtime;
515 stat->ctime = inode->i_ctime;
516 stat->blocks =
517 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
518
519 if (ip->i_d.di_version == 3) {
520 if (request_mask & STATX_BTIME) {
521 stat->result_mask |= STATX_BTIME;
522 stat->btime.tv_sec = ip->i_d.di_crtime.t_sec;
523 stat->btime.tv_nsec = ip->i_d.di_crtime.t_nsec;
524 }
525 }
526
527 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
528 stat->attributes |= STATX_ATTR_IMMUTABLE;
529 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
530 stat->attributes |= STATX_ATTR_APPEND;
531 if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
532 stat->attributes |= STATX_ATTR_NODUMP;
533
534 switch (inode->i_mode & S_IFMT) {
535 case S_IFBLK:
536 case S_IFCHR:
537 stat->blksize = BLKDEV_IOSIZE;
538 stat->rdev = inode->i_rdev;
539 break;
540 default:
541 if (XFS_IS_REALTIME_INODE(ip)) {
542 /*
543 * If the file blocks are being allocated from a
544 * realtime volume, then return the inode's realtime
545 * extent size or the realtime volume's extent size.
546 */
547 stat->blksize =
548 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
549 } else
550 stat->blksize = xfs_preferred_iosize(mp);
551 stat->rdev = 0;
552 break;
553 }
554
555 return 0;
556}
557
558static void
559xfs_setattr_mode(
560 struct xfs_inode *ip,
561 struct iattr *iattr)
562{
563 struct inode *inode = VFS_I(ip);
564 umode_t mode = iattr->ia_mode;
565
566 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
567
568 inode->i_mode &= S_IFMT;
569 inode->i_mode |= mode & ~S_IFMT;
570}
571
572void
573xfs_setattr_time(
574 struct xfs_inode *ip,
575 struct iattr *iattr)
576{
577 struct inode *inode = VFS_I(ip);
578
579 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
580
581 if (iattr->ia_valid & ATTR_ATIME)
582 inode->i_atime = iattr->ia_atime;
583 if (iattr->ia_valid & ATTR_CTIME)
584 inode->i_ctime = iattr->ia_ctime;
585 if (iattr->ia_valid & ATTR_MTIME)
586 inode->i_mtime = iattr->ia_mtime;
587}
588
589static int
590xfs_vn_change_ok(
591 struct dentry *dentry,
592 struct iattr *iattr)
593{
594 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
595
596 if (mp->m_flags & XFS_MOUNT_RDONLY)
597 return -EROFS;
598
599 if (XFS_FORCED_SHUTDOWN(mp))
600 return -EIO;
601
602 return setattr_prepare(dentry, iattr);
603}
604
605/*
606 * Set non-size attributes of an inode.
607 *
608 * Caution: The caller of this function is responsible for calling
609 * setattr_prepare() or otherwise verifying the change is fine.
610 */
611int
612xfs_setattr_nonsize(
613 struct xfs_inode *ip,
614 struct iattr *iattr,
615 int flags)
616{
617 xfs_mount_t *mp = ip->i_mount;
618 struct inode *inode = VFS_I(ip);
619 int mask = iattr->ia_valid;
620 xfs_trans_t *tp;
621 int error;
622 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
623 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
624 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
625 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
626
627 ASSERT((mask & ATTR_SIZE) == 0);
628
629 /*
630 * If disk quotas is on, we make sure that the dquots do exist on disk,
631 * before we start any other transactions. Trying to do this later
632 * is messy. We don't care to take a readlock to look at the ids
633 * in inode here, because we can't hold it across the trans_reserve.
634 * If the IDs do change before we take the ilock, we're covered
635 * because the i_*dquot fields will get updated anyway.
636 */
637 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
638 uint qflags = 0;
639
640 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
641 uid = iattr->ia_uid;
642 qflags |= XFS_QMOPT_UQUOTA;
643 } else {
644 uid = inode->i_uid;
645 }
646 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
647 gid = iattr->ia_gid;
648 qflags |= XFS_QMOPT_GQUOTA;
649 } else {
650 gid = inode->i_gid;
651 }
652
653 /*
654 * We take a reference when we initialize udqp and gdqp,
655 * so it is important that we never blindly double trip on
656 * the same variable. See xfs_create() for an example.
657 */
658 ASSERT(udqp == NULL);
659 ASSERT(gdqp == NULL);
660 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
661 xfs_kgid_to_gid(gid),
662 xfs_get_projid(ip),
663 qflags, &udqp, &gdqp, NULL);
664 if (error)
665 return error;
666 }
667
668 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
669 if (error)
670 goto out_dqrele;
671
672 xfs_ilock(ip, XFS_ILOCK_EXCL);
673 xfs_trans_ijoin(tp, ip, 0);
674
675 /*
676 * Change file ownership. Must be the owner or privileged.
677 */
678 if (mask & (ATTR_UID|ATTR_GID)) {
679 /*
680 * These IDs could have changed since we last looked at them.
681 * But, we're assured that if the ownership did change
682 * while we didn't have the inode locked, inode's dquot(s)
683 * would have changed also.
684 */
685 iuid = inode->i_uid;
686 igid = inode->i_gid;
687 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
688 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
689
690 /*
691 * Do a quota reservation only if uid/gid is actually
692 * going to change.
693 */
694 if (XFS_IS_QUOTA_RUNNING(mp) &&
695 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
696 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
697 ASSERT(tp);
698 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
699 NULL, capable(CAP_FOWNER) ?
700 XFS_QMOPT_FORCE_RES : 0);
701 if (error) /* out of quota */
702 goto out_cancel;
703 }
704 }
705
706 /*
707 * Change file ownership. Must be the owner or privileged.
708 */
709 if (mask & (ATTR_UID|ATTR_GID)) {
710 /*
711 * CAP_FSETID overrides the following restrictions:
712 *
713 * The set-user-ID and set-group-ID bits of a file will be
714 * cleared upon successful return from chown()
715 */
716 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
717 !capable(CAP_FSETID))
718 inode->i_mode &= ~(S_ISUID|S_ISGID);
719
720 /*
721 * Change the ownerships and register quota modifications
722 * in the transaction.
723 */
724 if (!uid_eq(iuid, uid)) {
725 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
726 ASSERT(mask & ATTR_UID);
727 ASSERT(udqp);
728 olddquot1 = xfs_qm_vop_chown(tp, ip,
729 &ip->i_udquot, udqp);
730 }
731 ip->i_d.di_uid = xfs_kuid_to_uid(uid);
732 inode->i_uid = uid;
733 }
734 if (!gid_eq(igid, gid)) {
735 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
736 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
737 !XFS_IS_PQUOTA_ON(mp));
738 ASSERT(mask & ATTR_GID);
739 ASSERT(gdqp);
740 olddquot2 = xfs_qm_vop_chown(tp, ip,
741 &ip->i_gdquot, gdqp);
742 }
743 ip->i_d.di_gid = xfs_kgid_to_gid(gid);
744 inode->i_gid = gid;
745 }
746 }
747
748 if (mask & ATTR_MODE)
749 xfs_setattr_mode(ip, iattr);
750 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
751 xfs_setattr_time(ip, iattr);
752
753 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
754
755 XFS_STATS_INC(mp, xs_ig_attrchg);
756
757 if (mp->m_flags & XFS_MOUNT_WSYNC)
758 xfs_trans_set_sync(tp);
759 error = xfs_trans_commit(tp);
760
761 xfs_iunlock(ip, XFS_ILOCK_EXCL);
762
763 /*
764 * Release any dquot(s) the inode had kept before chown.
765 */
766 xfs_qm_dqrele(olddquot1);
767 xfs_qm_dqrele(olddquot2);
768 xfs_qm_dqrele(udqp);
769 xfs_qm_dqrele(gdqp);
770
771 if (error)
772 return error;
773
774 /*
775 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
776 * update. We could avoid this with linked transactions
777 * and passing down the transaction pointer all the way
778 * to attr_set. No previous user of the generic
779 * Posix ACL code seems to care about this issue either.
780 */
781 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
782 error = posix_acl_chmod(inode, inode->i_mode);
783 if (error)
784 return error;
785 }
786
787 return 0;
788
789out_cancel:
790 xfs_trans_cancel(tp);
791out_dqrele:
792 xfs_qm_dqrele(udqp);
793 xfs_qm_dqrele(gdqp);
794 return error;
795}
796
797int
798xfs_vn_setattr_nonsize(
799 struct dentry *dentry,
800 struct iattr *iattr)
801{
802 struct xfs_inode *ip = XFS_I(d_inode(dentry));
803 int error;
804
805 trace_xfs_setattr(ip);
806
807 error = xfs_vn_change_ok(dentry, iattr);
808 if (error)
809 return error;
810 return xfs_setattr_nonsize(ip, iattr, 0);
811}
812
813/*
814 * Truncate file. Must have write permission and not be a directory.
815 *
816 * Caution: The caller of this function is responsible for calling
817 * setattr_prepare() or otherwise verifying the change is fine.
818 */
819STATIC int
820xfs_setattr_size(
821 struct xfs_inode *ip,
822 struct iattr *iattr)
823{
824 struct xfs_mount *mp = ip->i_mount;
825 struct inode *inode = VFS_I(ip);
826 xfs_off_t oldsize, newsize;
827 struct xfs_trans *tp;
828 int error;
829 uint lock_flags = 0;
830 bool did_zeroing = false;
831
832 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
833 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
834 ASSERT(S_ISREG(inode->i_mode));
835 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
836 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
837
838 oldsize = inode->i_size;
839 newsize = iattr->ia_size;
840
841 /*
842 * Short circuit the truncate case for zero length files.
843 */
844 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
845 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
846 return 0;
847
848 /*
849 * Use the regular setattr path to update the timestamps.
850 */
851 iattr->ia_valid &= ~ATTR_SIZE;
852 return xfs_setattr_nonsize(ip, iattr, 0);
853 }
854
855 /*
856 * Make sure that the dquots are attached to the inode.
857 */
858 error = xfs_qm_dqattach(ip, 0);
859 if (error)
860 return error;
861
862 /*
863 * Wait for all direct I/O to complete.
864 */
865 inode_dio_wait(inode);
866
867 /*
868 * File data changes must be complete before we start the transaction to
869 * modify the inode. This needs to be done before joining the inode to
870 * the transaction because the inode cannot be unlocked once it is a
871 * part of the transaction.
872 *
873 * Start with zeroing any data beyond EOF that we may expose on file
874 * extension, or zeroing out the rest of the block on a downward
875 * truncate.
876 */
877 if (newsize > oldsize) {
878 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
879 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
880 &did_zeroing, &xfs_iomap_ops);
881 } else {
882 error = iomap_truncate_page(inode, newsize, &did_zeroing,
883 &xfs_iomap_ops);
884 }
885
886 if (error)
887 return error;
888
889 /*
890 * We've already locked out new page faults, so now we can safely remove
891 * pages from the page cache knowing they won't get refaulted until we
892 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
893 * complete. The truncate_setsize() call also cleans partial EOF page
894 * PTEs on extending truncates and hence ensures sub-page block size
895 * filesystems are correctly handled, too.
896 *
897 * We have to do all the page cache truncate work outside the
898 * transaction context as the "lock" order is page lock->log space
899 * reservation as defined by extent allocation in the writeback path.
900 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
901 * having already truncated the in-memory version of the file (i.e. made
902 * user visible changes). There's not much we can do about this, except
903 * to hope that the caller sees ENOMEM and retries the truncate
904 * operation.
905 *
906 * And we update in-core i_size and truncate page cache beyond newsize
907 * before writeback the [di_size, newsize] range, so we're guaranteed
908 * not to write stale data past the new EOF on truncate down.
909 */
910 truncate_setsize(inode, newsize);
911
912 /*
913 * We are going to log the inode size change in this transaction so
914 * any previous writes that are beyond the on disk EOF and the new
915 * EOF that have not been written out need to be written here. If we
916 * do not write the data out, we expose ourselves to the null files
917 * problem. Note that this includes any block zeroing we did above;
918 * otherwise those blocks may not be zeroed after a crash.
919 */
920 if (did_zeroing ||
921 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
922 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
923 ip->i_d.di_size, newsize - 1);
924 if (error)
925 return error;
926 }
927
928 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
929 if (error)
930 return error;
931
932 lock_flags |= XFS_ILOCK_EXCL;
933 xfs_ilock(ip, XFS_ILOCK_EXCL);
934 xfs_trans_ijoin(tp, ip, 0);
935
936 /*
937 * Only change the c/mtime if we are changing the size or we are
938 * explicitly asked to change it. This handles the semantic difference
939 * between truncate() and ftruncate() as implemented in the VFS.
940 *
941 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
942 * special case where we need to update the times despite not having
943 * these flags set. For all other operations the VFS set these flags
944 * explicitly if it wants a timestamp update.
945 */
946 if (newsize != oldsize &&
947 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
948 iattr->ia_ctime = iattr->ia_mtime =
949 current_time(inode);
950 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
951 }
952
953 /*
954 * The first thing we do is set the size to new_size permanently on
955 * disk. This way we don't have to worry about anyone ever being able
956 * to look at the data being freed even in the face of a crash.
957 * What we're getting around here is the case where we free a block, it
958 * is allocated to another file, it is written to, and then we crash.
959 * If the new data gets written to the file but the log buffers
960 * containing the free and reallocation don't, then we'd end up with
961 * garbage in the blocks being freed. As long as we make the new size
962 * permanent before actually freeing any blocks it doesn't matter if
963 * they get written to.
964 */
965 ip->i_d.di_size = newsize;
966 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
967
968 if (newsize <= oldsize) {
969 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
970 if (error)
971 goto out_trans_cancel;
972
973 /*
974 * Truncated "down", so we're removing references to old data
975 * here - if we delay flushing for a long time, we expose
976 * ourselves unduly to the notorious NULL files problem. So,
977 * we mark this inode and flush it when the file is closed,
978 * and do not wait the usual (long) time for writeout.
979 */
980 xfs_iflags_set(ip, XFS_ITRUNCATED);
981
982 /* A truncate down always removes post-EOF blocks. */
983 xfs_inode_clear_eofblocks_tag(ip);
984 }
985
986 if (iattr->ia_valid & ATTR_MODE)
987 xfs_setattr_mode(ip, iattr);
988 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
989 xfs_setattr_time(ip, iattr);
990
991 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
992
993 XFS_STATS_INC(mp, xs_ig_attrchg);
994
995 if (mp->m_flags & XFS_MOUNT_WSYNC)
996 xfs_trans_set_sync(tp);
997
998 error = xfs_trans_commit(tp);
999out_unlock:
1000 if (lock_flags)
1001 xfs_iunlock(ip, lock_flags);
1002 return error;
1003
1004out_trans_cancel:
1005 xfs_trans_cancel(tp);
1006 goto out_unlock;
1007}
1008
1009int
1010xfs_vn_setattr_size(
1011 struct dentry *dentry,
1012 struct iattr *iattr)
1013{
1014 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1015 int error;
1016
1017 trace_xfs_setattr(ip);
1018
1019 error = xfs_vn_change_ok(dentry, iattr);
1020 if (error)
1021 return error;
1022 return xfs_setattr_size(ip, iattr);
1023}
1024
1025STATIC int
1026xfs_vn_setattr(
1027 struct dentry *dentry,
1028 struct iattr *iattr)
1029{
1030 int error;
1031
1032 if (iattr->ia_valid & ATTR_SIZE) {
1033 struct xfs_inode *ip = XFS_I(d_inode(dentry));
1034 uint iolock = XFS_IOLOCK_EXCL;
1035
1036 error = xfs_break_layouts(d_inode(dentry), &iolock);
1037 if (error)
1038 return error;
1039
1040 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1041 error = xfs_vn_setattr_size(dentry, iattr);
1042 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1043 } else {
1044 error = xfs_vn_setattr_nonsize(dentry, iattr);
1045 }
1046
1047 return error;
1048}
1049
1050STATIC int
1051xfs_vn_update_time(
1052 struct inode *inode,
1053 struct timespec *now,
1054 int flags)
1055{
1056 struct xfs_inode *ip = XFS_I(inode);
1057 struct xfs_mount *mp = ip->i_mount;
1058 int log_flags = XFS_ILOG_TIMESTAMP;
1059 struct xfs_trans *tp;
1060 int error;
1061
1062 trace_xfs_update_time(ip);
1063
1064 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1065 if (!((flags & S_VERSION) &&
1066 inode_maybe_inc_iversion(inode, false)))
1067 return generic_update_time(inode, now, flags);
1068
1069 /* Capture the iversion update that just occurred */
1070 log_flags |= XFS_ILOG_CORE;
1071 }
1072
1073 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1074 if (error)
1075 return error;
1076
1077 xfs_ilock(ip, XFS_ILOCK_EXCL);
1078 if (flags & S_CTIME)
1079 inode->i_ctime = *now;
1080 if (flags & S_MTIME)
1081 inode->i_mtime = *now;
1082 if (flags & S_ATIME)
1083 inode->i_atime = *now;
1084
1085 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1086 xfs_trans_log_inode(tp, ip, log_flags);
1087 return xfs_trans_commit(tp);
1088}
1089
1090STATIC int
1091xfs_vn_fiemap(
1092 struct inode *inode,
1093 struct fiemap_extent_info *fieinfo,
1094 u64 start,
1095 u64 length)
1096{
1097 int error;
1098
1099 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1100 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1101 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1102 error = iomap_fiemap(inode, fieinfo, start, length,
1103 &xfs_xattr_iomap_ops);
1104 } else {
1105 error = iomap_fiemap(inode, fieinfo, start, length,
1106 &xfs_iomap_ops);
1107 }
1108 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1109
1110 return error;
1111}
1112
1113STATIC int
1114xfs_vn_tmpfile(
1115 struct inode *dir,
1116 struct dentry *dentry,
1117 umode_t mode)
1118{
1119 return xfs_generic_create(dir, dentry, mode, 0, true);
1120}
1121
1122static const struct inode_operations xfs_inode_operations = {
1123 .get_acl = xfs_get_acl,
1124 .set_acl = xfs_set_acl,
1125 .getattr = xfs_vn_getattr,
1126 .setattr = xfs_vn_setattr,
1127 .listxattr = xfs_vn_listxattr,
1128 .fiemap = xfs_vn_fiemap,
1129 .update_time = xfs_vn_update_time,
1130};
1131
1132static const struct inode_operations xfs_dir_inode_operations = {
1133 .create = xfs_vn_create,
1134 .lookup = xfs_vn_lookup,
1135 .link = xfs_vn_link,
1136 .unlink = xfs_vn_unlink,
1137 .symlink = xfs_vn_symlink,
1138 .mkdir = xfs_vn_mkdir,
1139 /*
1140 * Yes, XFS uses the same method for rmdir and unlink.
1141 *
1142 * There are some subtile differences deeper in the code,
1143 * but we use S_ISDIR to check for those.
1144 */
1145 .rmdir = xfs_vn_unlink,
1146 .mknod = xfs_vn_mknod,
1147 .rename = xfs_vn_rename,
1148 .get_acl = xfs_get_acl,
1149 .set_acl = xfs_set_acl,
1150 .getattr = xfs_vn_getattr,
1151 .setattr = xfs_vn_setattr,
1152 .listxattr = xfs_vn_listxattr,
1153 .update_time = xfs_vn_update_time,
1154 .tmpfile = xfs_vn_tmpfile,
1155};
1156
1157static const struct inode_operations xfs_dir_ci_inode_operations = {
1158 .create = xfs_vn_create,
1159 .lookup = xfs_vn_ci_lookup,
1160 .link = xfs_vn_link,
1161 .unlink = xfs_vn_unlink,
1162 .symlink = xfs_vn_symlink,
1163 .mkdir = xfs_vn_mkdir,
1164 /*
1165 * Yes, XFS uses the same method for rmdir and unlink.
1166 *
1167 * There are some subtile differences deeper in the code,
1168 * but we use S_ISDIR to check for those.
1169 */
1170 .rmdir = xfs_vn_unlink,
1171 .mknod = xfs_vn_mknod,
1172 .rename = xfs_vn_rename,
1173 .get_acl = xfs_get_acl,
1174 .set_acl = xfs_set_acl,
1175 .getattr = xfs_vn_getattr,
1176 .setattr = xfs_vn_setattr,
1177 .listxattr = xfs_vn_listxattr,
1178 .update_time = xfs_vn_update_time,
1179 .tmpfile = xfs_vn_tmpfile,
1180};
1181
1182static const struct inode_operations xfs_symlink_inode_operations = {
1183 .get_link = xfs_vn_get_link,
1184 .getattr = xfs_vn_getattr,
1185 .setattr = xfs_vn_setattr,
1186 .listxattr = xfs_vn_listxattr,
1187 .update_time = xfs_vn_update_time,
1188};
1189
1190static const struct inode_operations xfs_inline_symlink_inode_operations = {
1191 .get_link = xfs_vn_get_link_inline,
1192 .getattr = xfs_vn_getattr,
1193 .setattr = xfs_vn_setattr,
1194 .listxattr = xfs_vn_listxattr,
1195 .update_time = xfs_vn_update_time,
1196};
1197
1198STATIC void
1199xfs_diflags_to_iflags(
1200 struct inode *inode,
1201 struct xfs_inode *ip)
1202{
1203 uint16_t flags = ip->i_d.di_flags;
1204
1205 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1206 S_NOATIME | S_DAX);
1207
1208 if (flags & XFS_DIFLAG_IMMUTABLE)
1209 inode->i_flags |= S_IMMUTABLE;
1210 if (flags & XFS_DIFLAG_APPEND)
1211 inode->i_flags |= S_APPEND;
1212 if (flags & XFS_DIFLAG_SYNC)
1213 inode->i_flags |= S_SYNC;
1214 if (flags & XFS_DIFLAG_NOATIME)
1215 inode->i_flags |= S_NOATIME;
1216 if (S_ISREG(inode->i_mode) &&
1217 ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE &&
1218 !xfs_is_reflink_inode(ip) &&
1219 (ip->i_mount->m_flags & XFS_MOUNT_DAX ||
1220 ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1221 inode->i_flags |= S_DAX;
1222}
1223
1224/*
1225 * Initialize the Linux inode.
1226 *
1227 * When reading existing inodes from disk this is called directly from xfs_iget,
1228 * when creating a new inode it is called from xfs_ialloc after setting up the
1229 * inode. These callers have different criteria for clearing XFS_INEW, so leave
1230 * it up to the caller to deal with unlocking the inode appropriately.
1231 */
1232void
1233xfs_setup_inode(
1234 struct xfs_inode *ip)
1235{
1236 struct inode *inode = &ip->i_vnode;
1237 gfp_t gfp_mask;
1238
1239 inode->i_ino = ip->i_ino;
1240 inode->i_state = I_NEW;
1241
1242 inode_sb_list_add(inode);
1243 /* make the inode look hashed for the writeback code */
1244 hlist_add_fake(&inode->i_hash);
1245
1246 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid);
1247 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid);
1248
1249 i_size_write(inode, ip->i_d.di_size);
1250 xfs_diflags_to_iflags(inode, ip);
1251
1252 if (S_ISDIR(inode->i_mode)) {
1253 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1254 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1255 } else {
1256 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1257 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1258 }
1259
1260 /*
1261 * Ensure all page cache allocations are done from GFP_NOFS context to
1262 * prevent direct reclaim recursion back into the filesystem and blowing
1263 * stacks or deadlocking.
1264 */
1265 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1266 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1267
1268 /*
1269 * If there is no attribute fork no ACL can exist on this inode,
1270 * and it can't have any file capabilities attached to it either.
1271 */
1272 if (!XFS_IFORK_Q(ip)) {
1273 inode_has_no_xattr(inode);
1274 cache_no_acl(inode);
1275 }
1276}
1277
1278void
1279xfs_setup_iops(
1280 struct xfs_inode *ip)
1281{
1282 struct inode *inode = &ip->i_vnode;
1283
1284 switch (inode->i_mode & S_IFMT) {
1285 case S_IFREG:
1286 inode->i_op = &xfs_inode_operations;
1287 inode->i_fop = &xfs_file_operations;
1288 if (IS_DAX(inode))
1289 inode->i_mapping->a_ops = &xfs_dax_aops;
1290 else
1291 inode->i_mapping->a_ops = &xfs_address_space_operations;
1292 break;
1293 case S_IFDIR:
1294 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1295 inode->i_op = &xfs_dir_ci_inode_operations;
1296 else
1297 inode->i_op = &xfs_dir_inode_operations;
1298 inode->i_fop = &xfs_dir_file_operations;
1299 break;
1300 case S_IFLNK:
1301 if (ip->i_df.if_flags & XFS_IFINLINE)
1302 inode->i_op = &xfs_inline_symlink_inode_operations;
1303 else
1304 inode->i_op = &xfs_symlink_inode_operations;
1305 break;
1306 default:
1307 inode->i_op = &xfs_inode_operations;
1308 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1309 break;
1310 }
1311}