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Linux/fs/xfs/xfs_iops.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  4  * All Rights Reserved.
  5  */
  6 #include "xfs.h"
  7 #include "xfs_fs.h"
  8 #include "xfs_shared.h"
  9 #include "xfs_format.h"
 10 #include "xfs_log_format.h"
 11 #include "xfs_trans_resv.h"
 12 #include "xfs_mount.h"
 13 #include "xfs_inode.h"
 14 #include "xfs_acl.h"
 15 #include "xfs_quota.h"
 16 #include "xfs_attr.h"
 17 #include "xfs_trans.h"
 18 #include "xfs_trace.h"
 19 #include "xfs_icache.h"
 20 #include "xfs_symlink.h"
 21 #include "xfs_dir2.h"
 22 #include "xfs_iomap.h"
 23 
 24 #include <linux/xattr.h>
 25 #include <linux/posix_acl.h>
 26 #include <linux/security.h>
 27 #include <linux/iversion.h>
 28 
 29 /*
 30  * Directories have different lock order w.r.t. mmap_sem compared to regular
 31  * files. This is due to readdir potentially triggering page faults on a user
 32  * buffer inside filldir(), and this happens with the ilock on the directory
 33  * held. For regular files, the lock order is the other way around - the
 34  * mmap_sem is taken during the page fault, and then we lock the ilock to do
 35  * block mapping. Hence we need a different class for the directory ilock so
 36  * that lockdep can tell them apart.
 37  */
 38 static struct lock_class_key xfs_nondir_ilock_class;
 39 static struct lock_class_key xfs_dir_ilock_class;
 40 
 41 static int
 42 xfs_initxattrs(
 43         struct inode            *inode,
 44         const struct xattr      *xattr_array,
 45         void                    *fs_info)
 46 {
 47         const struct xattr      *xattr;
 48         struct xfs_inode        *ip = XFS_I(inode);
 49         int                     error = 0;
 50 
 51         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 52                 error = xfs_attr_set(ip, xattr->name, xattr->value,
 53                                       xattr->value_len, ATTR_SECURE);
 54                 if (error < 0)
 55                         break;
 56         }
 57         return error;
 58 }
 59 
 60 /*
 61  * Hook in SELinux.  This is not quite correct yet, what we really need
 62  * here (as we do for default ACLs) is a mechanism by which creation of
 63  * these attrs can be journalled at inode creation time (along with the
 64  * inode, of course, such that log replay can't cause these to be lost).
 65  */
 66 
 67 STATIC int
 68 xfs_init_security(
 69         struct inode    *inode,
 70         struct inode    *dir,
 71         const struct qstr *qstr)
 72 {
 73         return security_inode_init_security(inode, dir, qstr,
 74                                              &xfs_initxattrs, NULL);
 75 }
 76 
 77 static void
 78 xfs_dentry_to_name(
 79         struct xfs_name *namep,
 80         struct dentry   *dentry)
 81 {
 82         namep->name = dentry->d_name.name;
 83         namep->len = dentry->d_name.len;
 84         namep->type = XFS_DIR3_FT_UNKNOWN;
 85 }
 86 
 87 static int
 88 xfs_dentry_mode_to_name(
 89         struct xfs_name *namep,
 90         struct dentry   *dentry,
 91         int             mode)
 92 {
 93         namep->name = dentry->d_name.name;
 94         namep->len = dentry->d_name.len;
 95         namep->type = xfs_mode_to_ftype(mode);
 96 
 97         if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
 98                 return -EFSCORRUPTED;
 99 
100         return 0;
101 }
102 
103 STATIC void
104 xfs_cleanup_inode(
105         struct inode    *dir,
106         struct inode    *inode,
107         struct dentry   *dentry)
108 {
109         struct xfs_name teardown;
110 
111         /* Oh, the horror.
112          * If we can't add the ACL or we fail in
113          * xfs_init_security we must back out.
114          * ENOSPC can hit here, among other things.
115          */
116         xfs_dentry_to_name(&teardown, dentry);
117 
118         xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
119 }
120 
121 STATIC int
122 xfs_generic_create(
123         struct inode    *dir,
124         struct dentry   *dentry,
125         umode_t         mode,
126         dev_t           rdev,
127         bool            tmpfile)        /* unnamed file */
128 {
129         struct inode    *inode;
130         struct xfs_inode *ip = NULL;
131         struct posix_acl *default_acl, *acl;
132         struct xfs_name name;
133         int             error;
134 
135         /*
136          * Irix uses Missed'em'V split, but doesn't want to see
137          * the upper 5 bits of (14bit) major.
138          */
139         if (S_ISCHR(mode) || S_ISBLK(mode)) {
140                 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
141                         return -EINVAL;
142         } else {
143                 rdev = 0;
144         }
145 
146         error = posix_acl_create(dir, &mode, &default_acl, &acl);
147         if (error)
148                 return error;
149 
150         /* Verify mode is valid also for tmpfile case */
151         error = xfs_dentry_mode_to_name(&name, dentry, mode);
152         if (unlikely(error))
153                 goto out_free_acl;
154 
155         if (!tmpfile) {
156                 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
157         } else {
158                 error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
159         }
160         if (unlikely(error))
161                 goto out_free_acl;
162 
163         inode = VFS_I(ip);
164 
165         error = xfs_init_security(inode, dir, &dentry->d_name);
166         if (unlikely(error))
167                 goto out_cleanup_inode;
168 
169 #ifdef CONFIG_XFS_POSIX_ACL
170         if (default_acl) {
171                 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
172                 if (error)
173                         goto out_cleanup_inode;
174         }
175         if (acl) {
176                 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
177                 if (error)
178                         goto out_cleanup_inode;
179         }
180 #endif
181 
182         xfs_setup_iops(ip);
183 
184         if (tmpfile) {
185                 /*
186                  * The VFS requires that any inode fed to d_tmpfile must have
187                  * nlink == 1 so that it can decrement the nlink in d_tmpfile.
188                  * However, we created the temp file with nlink == 0 because
189                  * we're not allowed to put an inode with nlink > 0 on the
190                  * unlinked list.  Therefore we have to set nlink to 1 so that
191                  * d_tmpfile can immediately set it back to zero.
192                  */
193                 set_nlink(inode, 1);
194                 d_tmpfile(dentry, inode);
195         } else
196                 d_instantiate(dentry, inode);
197 
198         xfs_finish_inode_setup(ip);
199 
200  out_free_acl:
201         if (default_acl)
202                 posix_acl_release(default_acl);
203         if (acl)
204                 posix_acl_release(acl);
205         return error;
206 
207  out_cleanup_inode:
208         xfs_finish_inode_setup(ip);
209         if (!tmpfile)
210                 xfs_cleanup_inode(dir, inode, dentry);
211         xfs_irele(ip);
212         goto out_free_acl;
213 }
214 
215 STATIC int
216 xfs_vn_mknod(
217         struct inode    *dir,
218         struct dentry   *dentry,
219         umode_t         mode,
220         dev_t           rdev)
221 {
222         return xfs_generic_create(dir, dentry, mode, rdev, false);
223 }
224 
225 STATIC int
226 xfs_vn_create(
227         struct inode    *dir,
228         struct dentry   *dentry,
229         umode_t         mode,
230         bool            flags)
231 {
232         return xfs_vn_mknod(dir, dentry, mode, 0);
233 }
234 
235 STATIC int
236 xfs_vn_mkdir(
237         struct inode    *dir,
238         struct dentry   *dentry,
239         umode_t         mode)
240 {
241         return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
242 }
243 
244 STATIC struct dentry *
245 xfs_vn_lookup(
246         struct inode    *dir,
247         struct dentry   *dentry,
248         unsigned int flags)
249 {
250         struct inode *inode;
251         struct xfs_inode *cip;
252         struct xfs_name name;
253         int             error;
254 
255         if (dentry->d_name.len >= MAXNAMELEN)
256                 return ERR_PTR(-ENAMETOOLONG);
257 
258         xfs_dentry_to_name(&name, dentry);
259         error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
260         if (likely(!error))
261                 inode = VFS_I(cip);
262         else if (likely(error == -ENOENT))
263                 inode = NULL;
264         else
265                 inode = ERR_PTR(error);
266         return d_splice_alias(inode, dentry);
267 }
268 
269 STATIC struct dentry *
270 xfs_vn_ci_lookup(
271         struct inode    *dir,
272         struct dentry   *dentry,
273         unsigned int flags)
274 {
275         struct xfs_inode *ip;
276         struct xfs_name xname;
277         struct xfs_name ci_name;
278         struct qstr     dname;
279         int             error;
280 
281         if (dentry->d_name.len >= MAXNAMELEN)
282                 return ERR_PTR(-ENAMETOOLONG);
283 
284         xfs_dentry_to_name(&xname, dentry);
285         error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
286         if (unlikely(error)) {
287                 if (unlikely(error != -ENOENT))
288                         return ERR_PTR(error);
289                 /*
290                  * call d_add(dentry, NULL) here when d_drop_negative_children
291                  * is called in xfs_vn_mknod (ie. allow negative dentries
292                  * with CI filesystems).
293                  */
294                 return NULL;
295         }
296 
297         /* if exact match, just splice and exit */
298         if (!ci_name.name)
299                 return d_splice_alias(VFS_I(ip), dentry);
300 
301         /* else case-insensitive match... */
302         dname.name = ci_name.name;
303         dname.len = ci_name.len;
304         dentry = d_add_ci(dentry, VFS_I(ip), &dname);
305         kmem_free(ci_name.name);
306         return dentry;
307 }
308 
309 STATIC int
310 xfs_vn_link(
311         struct dentry   *old_dentry,
312         struct inode    *dir,
313         struct dentry   *dentry)
314 {
315         struct inode    *inode = d_inode(old_dentry);
316         struct xfs_name name;
317         int             error;
318 
319         error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
320         if (unlikely(error))
321                 return error;
322 
323         error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
324         if (unlikely(error))
325                 return error;
326 
327         ihold(inode);
328         d_instantiate(dentry, inode);
329         return 0;
330 }
331 
332 STATIC int
333 xfs_vn_unlink(
334         struct inode    *dir,
335         struct dentry   *dentry)
336 {
337         struct xfs_name name;
338         int             error;
339 
340         xfs_dentry_to_name(&name, dentry);
341 
342         error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
343         if (error)
344                 return error;
345 
346         /*
347          * With unlink, the VFS makes the dentry "negative": no inode,
348          * but still hashed. This is incompatible with case-insensitive
349          * mode, so invalidate (unhash) the dentry in CI-mode.
350          */
351         if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
352                 d_invalidate(dentry);
353         return 0;
354 }
355 
356 STATIC int
357 xfs_vn_symlink(
358         struct inode    *dir,
359         struct dentry   *dentry,
360         const char      *symname)
361 {
362         struct inode    *inode;
363         struct xfs_inode *cip = NULL;
364         struct xfs_name name;
365         int             error;
366         umode_t         mode;
367 
368         mode = S_IFLNK |
369                 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
370         error = xfs_dentry_mode_to_name(&name, dentry, mode);
371         if (unlikely(error))
372                 goto out;
373 
374         error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
375         if (unlikely(error))
376                 goto out;
377 
378         inode = VFS_I(cip);
379 
380         error = xfs_init_security(inode, dir, &dentry->d_name);
381         if (unlikely(error))
382                 goto out_cleanup_inode;
383 
384         xfs_setup_iops(cip);
385 
386         d_instantiate(dentry, inode);
387         xfs_finish_inode_setup(cip);
388         return 0;
389 
390  out_cleanup_inode:
391         xfs_finish_inode_setup(cip);
392         xfs_cleanup_inode(dir, inode, dentry);
393         xfs_irele(cip);
394  out:
395         return error;
396 }
397 
398 STATIC int
399 xfs_vn_rename(
400         struct inode    *odir,
401         struct dentry   *odentry,
402         struct inode    *ndir,
403         struct dentry   *ndentry,
404         unsigned int    flags)
405 {
406         struct inode    *new_inode = d_inode(ndentry);
407         int             omode = 0;
408         int             error;
409         struct xfs_name oname;
410         struct xfs_name nname;
411 
412         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
413                 return -EINVAL;
414 
415         /* if we are exchanging files, we need to set i_mode of both files */
416         if (flags & RENAME_EXCHANGE)
417                 omode = d_inode(ndentry)->i_mode;
418 
419         error = xfs_dentry_mode_to_name(&oname, odentry, omode);
420         if (omode && unlikely(error))
421                 return error;
422 
423         error = xfs_dentry_mode_to_name(&nname, ndentry,
424                                         d_inode(odentry)->i_mode);
425         if (unlikely(error))
426                 return error;
427 
428         return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
429                           XFS_I(ndir), &nname,
430                           new_inode ? XFS_I(new_inode) : NULL, flags);
431 }
432 
433 /*
434  * careful here - this function can get called recursively, so
435  * we need to be very careful about how much stack we use.
436  * uio is kmalloced for this reason...
437  */
438 STATIC const char *
439 xfs_vn_get_link(
440         struct dentry           *dentry,
441         struct inode            *inode,
442         struct delayed_call     *done)
443 {
444         char                    *link;
445         int                     error = -ENOMEM;
446 
447         if (!dentry)
448                 return ERR_PTR(-ECHILD);
449 
450         link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
451         if (!link)
452                 goto out_err;
453 
454         error = xfs_readlink(XFS_I(d_inode(dentry)), link);
455         if (unlikely(error))
456                 goto out_kfree;
457 
458         set_delayed_call(done, kfree_link, link);
459         return link;
460 
461  out_kfree:
462         kfree(link);
463  out_err:
464         return ERR_PTR(error);
465 }
466 
467 STATIC const char *
468 xfs_vn_get_link_inline(
469         struct dentry           *dentry,
470         struct inode            *inode,
471         struct delayed_call     *done)
472 {
473         char                    *link;
474 
475         ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
476 
477         /*
478          * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
479          * if_data is junk.
480          */
481         link = XFS_I(inode)->i_df.if_u1.if_data;
482         if (!link)
483                 return ERR_PTR(-EFSCORRUPTED);
484         return link;
485 }
486 
487 STATIC int
488 xfs_vn_getattr(
489         const struct path       *path,
490         struct kstat            *stat,
491         u32                     request_mask,
492         unsigned int            query_flags)
493 {
494         struct inode            *inode = d_inode(path->dentry);
495         struct xfs_inode        *ip = XFS_I(inode);
496         struct xfs_mount        *mp = ip->i_mount;
497 
498         trace_xfs_getattr(ip);
499 
500         if (XFS_FORCED_SHUTDOWN(mp))
501                 return -EIO;
502 
503         stat->size = XFS_ISIZE(ip);
504         stat->dev = inode->i_sb->s_dev;
505         stat->mode = inode->i_mode;
506         stat->nlink = inode->i_nlink;
507         stat->uid = inode->i_uid;
508         stat->gid = inode->i_gid;
509         stat->ino = ip->i_ino;
510         stat->atime = inode->i_atime;
511         stat->mtime = inode->i_mtime;
512         stat->ctime = inode->i_ctime;
513         stat->blocks =
514                 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
515 
516         if (ip->i_d.di_version == 3) {
517                 if (request_mask & STATX_BTIME) {
518                         stat->result_mask |= STATX_BTIME;
519                         stat->btime.tv_sec = ip->i_d.di_crtime.t_sec;
520                         stat->btime.tv_nsec = ip->i_d.di_crtime.t_nsec;
521                 }
522         }
523 
524         /*
525          * Note: If you add another clause to set an attribute flag, please
526          * update attributes_mask below.
527          */
528         if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
529                 stat->attributes |= STATX_ATTR_IMMUTABLE;
530         if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
531                 stat->attributes |= STATX_ATTR_APPEND;
532         if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
533                 stat->attributes |= STATX_ATTR_NODUMP;
534 
535         stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
536                                   STATX_ATTR_APPEND |
537                                   STATX_ATTR_NODUMP);
538 
539         switch (inode->i_mode & S_IFMT) {
540         case S_IFBLK:
541         case S_IFCHR:
542                 stat->blksize = BLKDEV_IOSIZE;
543                 stat->rdev = inode->i_rdev;
544                 break;
545         default:
546                 if (XFS_IS_REALTIME_INODE(ip)) {
547                         /*
548                          * If the file blocks are being allocated from a
549                          * realtime volume, then return the inode's realtime
550                          * extent size or the realtime volume's extent size.
551                          */
552                         stat->blksize =
553                                 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
554                 } else
555                         stat->blksize = xfs_preferred_iosize(mp);
556                 stat->rdev = 0;
557                 break;
558         }
559 
560         return 0;
561 }
562 
563 static void
564 xfs_setattr_mode(
565         struct xfs_inode        *ip,
566         struct iattr            *iattr)
567 {
568         struct inode            *inode = VFS_I(ip);
569         umode_t                 mode = iattr->ia_mode;
570 
571         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
572 
573         inode->i_mode &= S_IFMT;
574         inode->i_mode |= mode & ~S_IFMT;
575 }
576 
577 void
578 xfs_setattr_time(
579         struct xfs_inode        *ip,
580         struct iattr            *iattr)
581 {
582         struct inode            *inode = VFS_I(ip);
583 
584         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
585 
586         if (iattr->ia_valid & ATTR_ATIME)
587                 inode->i_atime = iattr->ia_atime;
588         if (iattr->ia_valid & ATTR_CTIME)
589                 inode->i_ctime = iattr->ia_ctime;
590         if (iattr->ia_valid & ATTR_MTIME)
591                 inode->i_mtime = iattr->ia_mtime;
592 }
593 
594 static int
595 xfs_vn_change_ok(
596         struct dentry   *dentry,
597         struct iattr    *iattr)
598 {
599         struct xfs_mount        *mp = XFS_I(d_inode(dentry))->i_mount;
600 
601         if (mp->m_flags & XFS_MOUNT_RDONLY)
602                 return -EROFS;
603 
604         if (XFS_FORCED_SHUTDOWN(mp))
605                 return -EIO;
606 
607         return setattr_prepare(dentry, iattr);
608 }
609 
610 /*
611  * Set non-size attributes of an inode.
612  *
613  * Caution: The caller of this function is responsible for calling
614  * setattr_prepare() or otherwise verifying the change is fine.
615  */
616 int
617 xfs_setattr_nonsize(
618         struct xfs_inode        *ip,
619         struct iattr            *iattr,
620         int                     flags)
621 {
622         xfs_mount_t             *mp = ip->i_mount;
623         struct inode            *inode = VFS_I(ip);
624         int                     mask = iattr->ia_valid;
625         xfs_trans_t             *tp;
626         int                     error;
627         kuid_t                  uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
628         kgid_t                  gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
629         struct xfs_dquot        *udqp = NULL, *gdqp = NULL;
630         struct xfs_dquot        *olddquot1 = NULL, *olddquot2 = NULL;
631 
632         ASSERT((mask & ATTR_SIZE) == 0);
633 
634         /*
635          * If disk quotas is on, we make sure that the dquots do exist on disk,
636          * before we start any other transactions. Trying to do this later
637          * is messy. We don't care to take a readlock to look at the ids
638          * in inode here, because we can't hold it across the trans_reserve.
639          * If the IDs do change before we take the ilock, we're covered
640          * because the i_*dquot fields will get updated anyway.
641          */
642         if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
643                 uint    qflags = 0;
644 
645                 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
646                         uid = iattr->ia_uid;
647                         qflags |= XFS_QMOPT_UQUOTA;
648                 } else {
649                         uid = inode->i_uid;
650                 }
651                 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
652                         gid = iattr->ia_gid;
653                         qflags |= XFS_QMOPT_GQUOTA;
654                 }  else {
655                         gid = inode->i_gid;
656                 }
657 
658                 /*
659                  * We take a reference when we initialize udqp and gdqp,
660                  * so it is important that we never blindly double trip on
661                  * the same variable. See xfs_create() for an example.
662                  */
663                 ASSERT(udqp == NULL);
664                 ASSERT(gdqp == NULL);
665                 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
666                                            xfs_kgid_to_gid(gid),
667                                            xfs_get_projid(ip),
668                                            qflags, &udqp, &gdqp, NULL);
669                 if (error)
670                         return error;
671         }
672 
673         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
674         if (error)
675                 goto out_dqrele;
676 
677         xfs_ilock(ip, XFS_ILOCK_EXCL);
678         xfs_trans_ijoin(tp, ip, 0);
679 
680         /*
681          * Change file ownership.  Must be the owner or privileged.
682          */
683         if (mask & (ATTR_UID|ATTR_GID)) {
684                 /*
685                  * These IDs could have changed since we last looked at them.
686                  * But, we're assured that if the ownership did change
687                  * while we didn't have the inode locked, inode's dquot(s)
688                  * would have changed also.
689                  */
690                 iuid = inode->i_uid;
691                 igid = inode->i_gid;
692                 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
693                 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
694 
695                 /*
696                  * Do a quota reservation only if uid/gid is actually
697                  * going to change.
698                  */
699                 if (XFS_IS_QUOTA_RUNNING(mp) &&
700                     ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
701                      (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
702                         ASSERT(tp);
703                         error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
704                                                 NULL, capable(CAP_FOWNER) ?
705                                                 XFS_QMOPT_FORCE_RES : 0);
706                         if (error)      /* out of quota */
707                                 goto out_cancel;
708                 }
709         }
710 
711         /*
712          * Change file ownership.  Must be the owner or privileged.
713          */
714         if (mask & (ATTR_UID|ATTR_GID)) {
715                 /*
716                  * CAP_FSETID overrides the following restrictions:
717                  *
718                  * The set-user-ID and set-group-ID bits of a file will be
719                  * cleared upon successful return from chown()
720                  */
721                 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
722                     !capable(CAP_FSETID))
723                         inode->i_mode &= ~(S_ISUID|S_ISGID);
724 
725                 /*
726                  * Change the ownerships and register quota modifications
727                  * in the transaction.
728                  */
729                 if (!uid_eq(iuid, uid)) {
730                         if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
731                                 ASSERT(mask & ATTR_UID);
732                                 ASSERT(udqp);
733                                 olddquot1 = xfs_qm_vop_chown(tp, ip,
734                                                         &ip->i_udquot, udqp);
735                         }
736                         ip->i_d.di_uid = xfs_kuid_to_uid(uid);
737                         inode->i_uid = uid;
738                 }
739                 if (!gid_eq(igid, gid)) {
740                         if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
741                                 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
742                                        !XFS_IS_PQUOTA_ON(mp));
743                                 ASSERT(mask & ATTR_GID);
744                                 ASSERT(gdqp);
745                                 olddquot2 = xfs_qm_vop_chown(tp, ip,
746                                                         &ip->i_gdquot, gdqp);
747                         }
748                         ip->i_d.di_gid = xfs_kgid_to_gid(gid);
749                         inode->i_gid = gid;
750                 }
751         }
752 
753         if (mask & ATTR_MODE)
754                 xfs_setattr_mode(ip, iattr);
755         if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
756                 xfs_setattr_time(ip, iattr);
757 
758         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
759 
760         XFS_STATS_INC(mp, xs_ig_attrchg);
761 
762         if (mp->m_flags & XFS_MOUNT_WSYNC)
763                 xfs_trans_set_sync(tp);
764         error = xfs_trans_commit(tp);
765 
766         xfs_iunlock(ip, XFS_ILOCK_EXCL);
767 
768         /*
769          * Release any dquot(s) the inode had kept before chown.
770          */
771         xfs_qm_dqrele(olddquot1);
772         xfs_qm_dqrele(olddquot2);
773         xfs_qm_dqrele(udqp);
774         xfs_qm_dqrele(gdqp);
775 
776         if (error)
777                 return error;
778 
779         /*
780          * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
781          *           update.  We could avoid this with linked transactions
782          *           and passing down the transaction pointer all the way
783          *           to attr_set.  No previous user of the generic
784          *           Posix ACL code seems to care about this issue either.
785          */
786         if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
787                 error = posix_acl_chmod(inode, inode->i_mode);
788                 if (error)
789                         return error;
790         }
791 
792         return 0;
793 
794 out_cancel:
795         xfs_trans_cancel(tp);
796         xfs_iunlock(ip, XFS_ILOCK_EXCL);
797 out_dqrele:
798         xfs_qm_dqrele(udqp);
799         xfs_qm_dqrele(gdqp);
800         return error;
801 }
802 
803 int
804 xfs_vn_setattr_nonsize(
805         struct dentry           *dentry,
806         struct iattr            *iattr)
807 {
808         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
809         int error;
810 
811         trace_xfs_setattr(ip);
812 
813         error = xfs_vn_change_ok(dentry, iattr);
814         if (error)
815                 return error;
816         return xfs_setattr_nonsize(ip, iattr, 0);
817 }
818 
819 /*
820  * Truncate file.  Must have write permission and not be a directory.
821  *
822  * Caution: The caller of this function is responsible for calling
823  * setattr_prepare() or otherwise verifying the change is fine.
824  */
825 STATIC int
826 xfs_setattr_size(
827         struct xfs_inode        *ip,
828         struct iattr            *iattr)
829 {
830         struct xfs_mount        *mp = ip->i_mount;
831         struct inode            *inode = VFS_I(ip);
832         xfs_off_t               oldsize, newsize;
833         struct xfs_trans        *tp;
834         int                     error;
835         uint                    lock_flags = 0;
836         bool                    did_zeroing = false;
837 
838         ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
839         ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
840         ASSERT(S_ISREG(inode->i_mode));
841         ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
842                 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
843 
844         oldsize = inode->i_size;
845         newsize = iattr->ia_size;
846 
847         /*
848          * Short circuit the truncate case for zero length files.
849          */
850         if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
851                 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
852                         return 0;
853 
854                 /*
855                  * Use the regular setattr path to update the timestamps.
856                  */
857                 iattr->ia_valid &= ~ATTR_SIZE;
858                 return xfs_setattr_nonsize(ip, iattr, 0);
859         }
860 
861         /*
862          * Make sure that the dquots are attached to the inode.
863          */
864         error = xfs_qm_dqattach(ip);
865         if (error)
866                 return error;
867 
868         /*
869          * Wait for all direct I/O to complete.
870          */
871         inode_dio_wait(inode);
872 
873         /*
874          * File data changes must be complete before we start the transaction to
875          * modify the inode.  This needs to be done before joining the inode to
876          * the transaction because the inode cannot be unlocked once it is a
877          * part of the transaction.
878          *
879          * Start with zeroing any data beyond EOF that we may expose on file
880          * extension, or zeroing out the rest of the block on a downward
881          * truncate.
882          */
883         if (newsize > oldsize) {
884                 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
885                 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
886                                 &did_zeroing, &xfs_iomap_ops);
887         } else {
888                 error = iomap_truncate_page(inode, newsize, &did_zeroing,
889                                 &xfs_iomap_ops);
890         }
891 
892         if (error)
893                 return error;
894 
895         /*
896          * We've already locked out new page faults, so now we can safely remove
897          * pages from the page cache knowing they won't get refaulted until we
898          * drop the XFS_MMAP_EXCL lock after the extent manipulations are
899          * complete. The truncate_setsize() call also cleans partial EOF page
900          * PTEs on extending truncates and hence ensures sub-page block size
901          * filesystems are correctly handled, too.
902          *
903          * We have to do all the page cache truncate work outside the
904          * transaction context as the "lock" order is page lock->log space
905          * reservation as defined by extent allocation in the writeback path.
906          * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
907          * having already truncated the in-memory version of the file (i.e. made
908          * user visible changes). There's not much we can do about this, except
909          * to hope that the caller sees ENOMEM and retries the truncate
910          * operation.
911          *
912          * And we update in-core i_size and truncate page cache beyond newsize
913          * before writeback the [di_size, newsize] range, so we're guaranteed
914          * not to write stale data past the new EOF on truncate down.
915          */
916         truncate_setsize(inode, newsize);
917 
918         /*
919          * We are going to log the inode size change in this transaction so
920          * any previous writes that are beyond the on disk EOF and the new
921          * EOF that have not been written out need to be written here.  If we
922          * do not write the data out, we expose ourselves to the null files
923          * problem. Note that this includes any block zeroing we did above;
924          * otherwise those blocks may not be zeroed after a crash.
925          */
926         if (did_zeroing ||
927             (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
928                 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
929                                                 ip->i_d.di_size, newsize - 1);
930                 if (error)
931                         return error;
932         }
933 
934         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
935         if (error)
936                 return error;
937 
938         lock_flags |= XFS_ILOCK_EXCL;
939         xfs_ilock(ip, XFS_ILOCK_EXCL);
940         xfs_trans_ijoin(tp, ip, 0);
941 
942         /*
943          * Only change the c/mtime if we are changing the size or we are
944          * explicitly asked to change it.  This handles the semantic difference
945          * between truncate() and ftruncate() as implemented in the VFS.
946          *
947          * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
948          * special case where we need to update the times despite not having
949          * these flags set.  For all other operations the VFS set these flags
950          * explicitly if it wants a timestamp update.
951          */
952         if (newsize != oldsize &&
953             !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
954                 iattr->ia_ctime = iattr->ia_mtime =
955                         current_time(inode);
956                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
957         }
958 
959         /*
960          * The first thing we do is set the size to new_size permanently on
961          * disk.  This way we don't have to worry about anyone ever being able
962          * to look at the data being freed even in the face of a crash.
963          * What we're getting around here is the case where we free a block, it
964          * is allocated to another file, it is written to, and then we crash.
965          * If the new data gets written to the file but the log buffers
966          * containing the free and reallocation don't, then we'd end up with
967          * garbage in the blocks being freed.  As long as we make the new size
968          * permanent before actually freeing any blocks it doesn't matter if
969          * they get written to.
970          */
971         ip->i_d.di_size = newsize;
972         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
973 
974         if (newsize <= oldsize) {
975                 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
976                 if (error)
977                         goto out_trans_cancel;
978 
979                 /*
980                  * Truncated "down", so we're removing references to old data
981                  * here - if we delay flushing for a long time, we expose
982                  * ourselves unduly to the notorious NULL files problem.  So,
983                  * we mark this inode and flush it when the file is closed,
984                  * and do not wait the usual (long) time for writeout.
985                  */
986                 xfs_iflags_set(ip, XFS_ITRUNCATED);
987 
988                 /* A truncate down always removes post-EOF blocks. */
989                 xfs_inode_clear_eofblocks_tag(ip);
990         }
991 
992         if (iattr->ia_valid & ATTR_MODE)
993                 xfs_setattr_mode(ip, iattr);
994         if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
995                 xfs_setattr_time(ip, iattr);
996 
997         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
998 
999         XFS_STATS_INC(mp, xs_ig_attrchg);
1000 
1001         if (mp->m_flags & XFS_MOUNT_WSYNC)
1002                 xfs_trans_set_sync(tp);
1003 
1004         error = xfs_trans_commit(tp);
1005 out_unlock:
1006         if (lock_flags)
1007                 xfs_iunlock(ip, lock_flags);
1008         return error;
1009 
1010 out_trans_cancel:
1011         xfs_trans_cancel(tp);
1012         goto out_unlock;
1013 }
1014 
1015 int
1016 xfs_vn_setattr_size(
1017         struct dentry           *dentry,
1018         struct iattr            *iattr)
1019 {
1020         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1021         int error;
1022 
1023         trace_xfs_setattr(ip);
1024 
1025         error = xfs_vn_change_ok(dentry, iattr);
1026         if (error)
1027                 return error;
1028         return xfs_setattr_size(ip, iattr);
1029 }
1030 
1031 STATIC int
1032 xfs_vn_setattr(
1033         struct dentry           *dentry,
1034         struct iattr            *iattr)
1035 {
1036         int                     error;
1037 
1038         if (iattr->ia_valid & ATTR_SIZE) {
1039                 struct inode            *inode = d_inode(dentry);
1040                 struct xfs_inode        *ip = XFS_I(inode);
1041                 uint                    iolock;
1042 
1043                 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1044                 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1045 
1046                 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1047                 if (error) {
1048                         xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1049                         return error;
1050                 }
1051 
1052                 error = xfs_vn_setattr_size(dentry, iattr);
1053                 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1054         } else {
1055                 error = xfs_vn_setattr_nonsize(dentry, iattr);
1056         }
1057 
1058         return error;
1059 }
1060 
1061 STATIC int
1062 xfs_vn_update_time(
1063         struct inode            *inode,
1064         struct timespec64       *now,
1065         int                     flags)
1066 {
1067         struct xfs_inode        *ip = XFS_I(inode);
1068         struct xfs_mount        *mp = ip->i_mount;
1069         int                     log_flags = XFS_ILOG_TIMESTAMP;
1070         struct xfs_trans        *tp;
1071         int                     error;
1072 
1073         trace_xfs_update_time(ip);
1074 
1075         if (inode->i_sb->s_flags & SB_LAZYTIME) {
1076                 if (!((flags & S_VERSION) &&
1077                       inode_maybe_inc_iversion(inode, false)))
1078                         return generic_update_time(inode, now, flags);
1079 
1080                 /* Capture the iversion update that just occurred */
1081                 log_flags |= XFS_ILOG_CORE;
1082         }
1083 
1084         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1085         if (error)
1086                 return error;
1087 
1088         xfs_ilock(ip, XFS_ILOCK_EXCL);
1089         if (flags & S_CTIME)
1090                 inode->i_ctime = *now;
1091         if (flags & S_MTIME)
1092                 inode->i_mtime = *now;
1093         if (flags & S_ATIME)
1094                 inode->i_atime = *now;
1095 
1096         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1097         xfs_trans_log_inode(tp, ip, log_flags);
1098         return xfs_trans_commit(tp);
1099 }
1100 
1101 STATIC int
1102 xfs_vn_fiemap(
1103         struct inode            *inode,
1104         struct fiemap_extent_info *fieinfo,
1105         u64                     start,
1106         u64                     length)
1107 {
1108         int                     error;
1109 
1110         xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1111         if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1112                 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1113                 error = iomap_fiemap(inode, fieinfo, start, length,
1114                                 &xfs_xattr_iomap_ops);
1115         } else {
1116                 error = iomap_fiemap(inode, fieinfo, start, length,
1117                                 &xfs_iomap_ops);
1118         }
1119         xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1120 
1121         return error;
1122 }
1123 
1124 STATIC int
1125 xfs_vn_tmpfile(
1126         struct inode    *dir,
1127         struct dentry   *dentry,
1128         umode_t         mode)
1129 {
1130         return xfs_generic_create(dir, dentry, mode, 0, true);
1131 }
1132 
1133 static const struct inode_operations xfs_inode_operations = {
1134         .get_acl                = xfs_get_acl,
1135         .set_acl                = xfs_set_acl,
1136         .getattr                = xfs_vn_getattr,
1137         .setattr                = xfs_vn_setattr,
1138         .listxattr              = xfs_vn_listxattr,
1139         .fiemap                 = xfs_vn_fiemap,
1140         .update_time            = xfs_vn_update_time,
1141 };
1142 
1143 static const struct inode_operations xfs_dir_inode_operations = {
1144         .create                 = xfs_vn_create,
1145         .lookup                 = xfs_vn_lookup,
1146         .link                   = xfs_vn_link,
1147         .unlink                 = xfs_vn_unlink,
1148         .symlink                = xfs_vn_symlink,
1149         .mkdir                  = xfs_vn_mkdir,
1150         /*
1151          * Yes, XFS uses the same method for rmdir and unlink.
1152          *
1153          * There are some subtile differences deeper in the code,
1154          * but we use S_ISDIR to check for those.
1155          */
1156         .rmdir                  = xfs_vn_unlink,
1157         .mknod                  = xfs_vn_mknod,
1158         .rename                 = xfs_vn_rename,
1159         .get_acl                = xfs_get_acl,
1160         .set_acl                = xfs_set_acl,
1161         .getattr                = xfs_vn_getattr,
1162         .setattr                = xfs_vn_setattr,
1163         .listxattr              = xfs_vn_listxattr,
1164         .update_time            = xfs_vn_update_time,
1165         .tmpfile                = xfs_vn_tmpfile,
1166 };
1167 
1168 static const struct inode_operations xfs_dir_ci_inode_operations = {
1169         .create                 = xfs_vn_create,
1170         .lookup                 = xfs_vn_ci_lookup,
1171         .link                   = xfs_vn_link,
1172         .unlink                 = xfs_vn_unlink,
1173         .symlink                = xfs_vn_symlink,
1174         .mkdir                  = xfs_vn_mkdir,
1175         /*
1176          * Yes, XFS uses the same method for rmdir and unlink.
1177          *
1178          * There are some subtile differences deeper in the code,
1179          * but we use S_ISDIR to check for those.
1180          */
1181         .rmdir                  = xfs_vn_unlink,
1182         .mknod                  = xfs_vn_mknod,
1183         .rename                 = xfs_vn_rename,
1184         .get_acl                = xfs_get_acl,
1185         .set_acl                = xfs_set_acl,
1186         .getattr                = xfs_vn_getattr,
1187         .setattr                = xfs_vn_setattr,
1188         .listxattr              = xfs_vn_listxattr,
1189         .update_time            = xfs_vn_update_time,
1190         .tmpfile                = xfs_vn_tmpfile,
1191 };
1192 
1193 static const struct inode_operations xfs_symlink_inode_operations = {
1194         .get_link               = xfs_vn_get_link,
1195         .getattr                = xfs_vn_getattr,
1196         .setattr                = xfs_vn_setattr,
1197         .listxattr              = xfs_vn_listxattr,
1198         .update_time            = xfs_vn_update_time,
1199 };
1200 
1201 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1202         .get_link               = xfs_vn_get_link_inline,
1203         .getattr                = xfs_vn_getattr,
1204         .setattr                = xfs_vn_setattr,
1205         .listxattr              = xfs_vn_listxattr,
1206         .update_time            = xfs_vn_update_time,
1207 };
1208 
1209 /* Figure out if this file actually supports DAX. */
1210 static bool
1211 xfs_inode_supports_dax(
1212         struct xfs_inode        *ip)
1213 {
1214         struct xfs_mount        *mp = ip->i_mount;
1215 
1216         /* Only supported on non-reflinked files. */
1217         if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
1218                 return false;
1219 
1220         /* DAX mount option or DAX iflag must be set. */
1221         if (!(mp->m_flags & XFS_MOUNT_DAX) &&
1222             !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1223                 return false;
1224 
1225         /* Block size must match page size */
1226         if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1227                 return false;
1228 
1229         /* Device has to support DAX too. */
1230         return xfs_find_daxdev_for_inode(VFS_I(ip)) != NULL;
1231 }
1232 
1233 STATIC void
1234 xfs_diflags_to_iflags(
1235         struct inode            *inode,
1236         struct xfs_inode        *ip)
1237 {
1238         uint16_t                flags = ip->i_d.di_flags;
1239 
1240         inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1241                             S_NOATIME | S_DAX);
1242 
1243         if (flags & XFS_DIFLAG_IMMUTABLE)
1244                 inode->i_flags |= S_IMMUTABLE;
1245         if (flags & XFS_DIFLAG_APPEND)
1246                 inode->i_flags |= S_APPEND;
1247         if (flags & XFS_DIFLAG_SYNC)
1248                 inode->i_flags |= S_SYNC;
1249         if (flags & XFS_DIFLAG_NOATIME)
1250                 inode->i_flags |= S_NOATIME;
1251         if (xfs_inode_supports_dax(ip))
1252                 inode->i_flags |= S_DAX;
1253 }
1254 
1255 /*
1256  * Initialize the Linux inode.
1257  *
1258  * When reading existing inodes from disk this is called directly from xfs_iget,
1259  * when creating a new inode it is called from xfs_ialloc after setting up the
1260  * inode. These callers have different criteria for clearing XFS_INEW, so leave
1261  * it up to the caller to deal with unlocking the inode appropriately.
1262  */
1263 void
1264 xfs_setup_inode(
1265         struct xfs_inode        *ip)
1266 {
1267         struct inode            *inode = &ip->i_vnode;
1268         gfp_t                   gfp_mask;
1269 
1270         inode->i_ino = ip->i_ino;
1271         inode->i_state = I_NEW;
1272 
1273         inode_sb_list_add(inode);
1274         /* make the inode look hashed for the writeback code */
1275         inode_fake_hash(inode);
1276 
1277         inode->i_uid    = xfs_uid_to_kuid(ip->i_d.di_uid);
1278         inode->i_gid    = xfs_gid_to_kgid(ip->i_d.di_gid);
1279 
1280         i_size_write(inode, ip->i_d.di_size);
1281         xfs_diflags_to_iflags(inode, ip);
1282 
1283         if (S_ISDIR(inode->i_mode)) {
1284                 /*
1285                  * We set the i_rwsem class here to avoid potential races with
1286                  * lockdep_annotate_inode_mutex_key() reinitialising the lock
1287                  * after a filehandle lookup has already found the inode in
1288                  * cache before it has been unlocked via unlock_new_inode().
1289                  */
1290                 lockdep_set_class(&inode->i_rwsem,
1291                                   &inode->i_sb->s_type->i_mutex_dir_key);
1292                 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1293                 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1294         } else {
1295                 ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1296                 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1297         }
1298 
1299         /*
1300          * Ensure all page cache allocations are done from GFP_NOFS context to
1301          * prevent direct reclaim recursion back into the filesystem and blowing
1302          * stacks or deadlocking.
1303          */
1304         gfp_mask = mapping_gfp_mask(inode->i_mapping);
1305         mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1306 
1307         /*
1308          * If there is no attribute fork no ACL can exist on this inode,
1309          * and it can't have any file capabilities attached to it either.
1310          */
1311         if (!XFS_IFORK_Q(ip)) {
1312                 inode_has_no_xattr(inode);
1313                 cache_no_acl(inode);
1314         }
1315 }
1316 
1317 void
1318 xfs_setup_iops(
1319         struct xfs_inode        *ip)
1320 {
1321         struct inode            *inode = &ip->i_vnode;
1322 
1323         switch (inode->i_mode & S_IFMT) {
1324         case S_IFREG:
1325                 inode->i_op = &xfs_inode_operations;
1326                 inode->i_fop = &xfs_file_operations;
1327                 if (IS_DAX(inode))
1328                         inode->i_mapping->a_ops = &xfs_dax_aops;
1329                 else
1330                         inode->i_mapping->a_ops = &xfs_address_space_operations;
1331                 break;
1332         case S_IFDIR:
1333                 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1334                         inode->i_op = &xfs_dir_ci_inode_operations;
1335                 else
1336                         inode->i_op = &xfs_dir_inode_operations;
1337                 inode->i_fop = &xfs_dir_file_operations;
1338                 break;
1339         case S_IFLNK:
1340                 if (ip->i_df.if_flags & XFS_IFINLINE)
1341                         inode->i_op = &xfs_inline_symlink_inode_operations;
1342                 else
1343                         inode->i_op = &xfs_symlink_inode_operations;
1344                 break;
1345         default:
1346                 inode->i_op = &xfs_inode_operations;
1347                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1348                 break;
1349         }
1350 }
1351 

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