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TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_iops.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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  */
 58 static struct lock_class_key xfs_nondir_ilock_class;
 59 static struct lock_class_key xfs_dir_ilock_class;
 60 
 61 static int
 62 xfs_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 
 87 STATIC int
 88 xfs_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 
 97 static void
 98 xfs_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 
108 STATIC void
109 xfs_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 
126 STATIC int
127 xfs_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 
206 STATIC int
207 xfs_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 
216 STATIC int
217 xfs_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 
226 STATIC int
227 xfs_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 
235 STATIC struct dentry *
236 xfs_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 
260 STATIC struct dentry *
261 xfs_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 
300 STATIC int
301 xfs_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 
321 STATIC int
322 xfs_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 
345 STATIC int
346 xfs_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 
383 STATIC int
384 xfs_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  */
416 STATIC const char *
417 xfs_vn_follow_link(
418         struct dentry           *dentry,
419         void                    **cookie)
420 {
421         char                    *link;
422         int                     error = -ENOMEM;
423 
424         link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
425         if (!link)
426                 goto out_err;
427 
428         error = xfs_readlink(XFS_I(d_inode(dentry)), link);
429         if (unlikely(error))
430                 goto out_kfree;
431 
432         return *cookie = link;
433 
434  out_kfree:
435         kfree(link);
436  out_err:
437         return ERR_PTR(error);
438 }
439 
440 STATIC int
441 xfs_vn_getattr(
442         struct vfsmount         *mnt,
443         struct dentry           *dentry,
444         struct kstat            *stat)
445 {
446         struct inode            *inode = d_inode(dentry);
447         struct xfs_inode        *ip = XFS_I(inode);
448         struct xfs_mount        *mp = ip->i_mount;
449 
450         trace_xfs_getattr(ip);
451 
452         if (XFS_FORCED_SHUTDOWN(mp))
453                 return -EIO;
454 
455         stat->size = XFS_ISIZE(ip);
456         stat->dev = inode->i_sb->s_dev;
457         stat->mode = ip->i_d.di_mode;
458         stat->nlink = ip->i_d.di_nlink;
459         stat->uid = inode->i_uid;
460         stat->gid = inode->i_gid;
461         stat->ino = ip->i_ino;
462         stat->atime = inode->i_atime;
463         stat->mtime = inode->i_mtime;
464         stat->ctime = inode->i_ctime;
465         stat->blocks =
466                 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
467 
468 
469         switch (inode->i_mode & S_IFMT) {
470         case S_IFBLK:
471         case S_IFCHR:
472                 stat->blksize = BLKDEV_IOSIZE;
473                 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
474                                    sysv_minor(ip->i_df.if_u2.if_rdev));
475                 break;
476         default:
477                 if (XFS_IS_REALTIME_INODE(ip)) {
478                         /*
479                          * If the file blocks are being allocated from a
480                          * realtime volume, then return the inode's realtime
481                          * extent size or the realtime volume's extent size.
482                          */
483                         stat->blksize =
484                                 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
485                 } else
486                         stat->blksize = xfs_preferred_iosize(mp);
487                 stat->rdev = 0;
488                 break;
489         }
490 
491         return 0;
492 }
493 
494 static void
495 xfs_setattr_mode(
496         struct xfs_inode        *ip,
497         struct iattr            *iattr)
498 {
499         struct inode            *inode = VFS_I(ip);
500         umode_t                 mode = iattr->ia_mode;
501 
502         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
503 
504         ip->i_d.di_mode &= S_IFMT;
505         ip->i_d.di_mode |= mode & ~S_IFMT;
506 
507         inode->i_mode &= S_IFMT;
508         inode->i_mode |= mode & ~S_IFMT;
509 }
510 
511 void
512 xfs_setattr_time(
513         struct xfs_inode        *ip,
514         struct iattr            *iattr)
515 {
516         struct inode            *inode = VFS_I(ip);
517 
518         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
519 
520         if (iattr->ia_valid & ATTR_ATIME) {
521                 inode->i_atime = iattr->ia_atime;
522                 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
523                 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
524         }
525         if (iattr->ia_valid & ATTR_CTIME) {
526                 inode->i_ctime = iattr->ia_ctime;
527                 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
528                 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
529         }
530         if (iattr->ia_valid & ATTR_MTIME) {
531                 inode->i_mtime = iattr->ia_mtime;
532                 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
533                 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
534         }
535 }
536 
537 int
538 xfs_setattr_nonsize(
539         struct xfs_inode        *ip,
540         struct iattr            *iattr,
541         int                     flags)
542 {
543         xfs_mount_t             *mp = ip->i_mount;
544         struct inode            *inode = VFS_I(ip);
545         int                     mask = iattr->ia_valid;
546         xfs_trans_t             *tp;
547         int                     error;
548         kuid_t                  uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
549         kgid_t                  gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
550         struct xfs_dquot        *udqp = NULL, *gdqp = NULL;
551         struct xfs_dquot        *olddquot1 = NULL, *olddquot2 = NULL;
552 
553         trace_xfs_setattr(ip);
554 
555         /* If acls are being inherited, we already have this checked */
556         if (!(flags & XFS_ATTR_NOACL)) {
557                 if (mp->m_flags & XFS_MOUNT_RDONLY)
558                         return -EROFS;
559 
560                 if (XFS_FORCED_SHUTDOWN(mp))
561                         return -EIO;
562 
563                 error = inode_change_ok(inode, iattr);
564                 if (error)
565                         return error;
566         }
567 
568         ASSERT((mask & ATTR_SIZE) == 0);
569 
570         /*
571          * If disk quotas is on, we make sure that the dquots do exist on disk,
572          * before we start any other transactions. Trying to do this later
573          * is messy. We don't care to take a readlock to look at the ids
574          * in inode here, because we can't hold it across the trans_reserve.
575          * If the IDs do change before we take the ilock, we're covered
576          * because the i_*dquot fields will get updated anyway.
577          */
578         if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
579                 uint    qflags = 0;
580 
581                 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
582                         uid = iattr->ia_uid;
583                         qflags |= XFS_QMOPT_UQUOTA;
584                 } else {
585                         uid = inode->i_uid;
586                 }
587                 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
588                         gid = iattr->ia_gid;
589                         qflags |= XFS_QMOPT_GQUOTA;
590                 }  else {
591                         gid = inode->i_gid;
592                 }
593 
594                 /*
595                  * We take a reference when we initialize udqp and gdqp,
596                  * so it is important that we never blindly double trip on
597                  * the same variable. See xfs_create() for an example.
598                  */
599                 ASSERT(udqp == NULL);
600                 ASSERT(gdqp == NULL);
601                 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
602                                            xfs_kgid_to_gid(gid),
603                                            xfs_get_projid(ip),
604                                            qflags, &udqp, &gdqp, NULL);
605                 if (error)
606                         return error;
607         }
608 
609         tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
610         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
611         if (error)
612                 goto out_trans_cancel;
613 
614         xfs_ilock(ip, XFS_ILOCK_EXCL);
615 
616         /*
617          * Change file ownership.  Must be the owner or privileged.
618          */
619         if (mask & (ATTR_UID|ATTR_GID)) {
620                 /*
621                  * These IDs could have changed since we last looked at them.
622                  * But, we're assured that if the ownership did change
623                  * while we didn't have the inode locked, inode's dquot(s)
624                  * would have changed also.
625                  */
626                 iuid = inode->i_uid;
627                 igid = inode->i_gid;
628                 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
629                 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
630 
631                 /*
632                  * Do a quota reservation only if uid/gid is actually
633                  * going to change.
634                  */
635                 if (XFS_IS_QUOTA_RUNNING(mp) &&
636                     ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
637                      (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
638                         ASSERT(tp);
639                         error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
640                                                 NULL, capable(CAP_FOWNER) ?
641                                                 XFS_QMOPT_FORCE_RES : 0);
642                         if (error)      /* out of quota */
643                                 goto out_unlock;
644                 }
645         }
646 
647         xfs_trans_ijoin(tp, ip, 0);
648 
649         /*
650          * Change file ownership.  Must be the owner or privileged.
651          */
652         if (mask & (ATTR_UID|ATTR_GID)) {
653                 /*
654                  * CAP_FSETID overrides the following restrictions:
655                  *
656                  * The set-user-ID and set-group-ID bits of a file will be
657                  * cleared upon successful return from chown()
658                  */
659                 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
660                     !capable(CAP_FSETID))
661                         ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
662 
663                 /*
664                  * Change the ownerships and register quota modifications
665                  * in the transaction.
666                  */
667                 if (!uid_eq(iuid, uid)) {
668                         if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
669                                 ASSERT(mask & ATTR_UID);
670                                 ASSERT(udqp);
671                                 olddquot1 = xfs_qm_vop_chown(tp, ip,
672                                                         &ip->i_udquot, udqp);
673                         }
674                         ip->i_d.di_uid = xfs_kuid_to_uid(uid);
675                         inode->i_uid = uid;
676                 }
677                 if (!gid_eq(igid, gid)) {
678                         if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
679                                 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
680                                        !XFS_IS_PQUOTA_ON(mp));
681                                 ASSERT(mask & ATTR_GID);
682                                 ASSERT(gdqp);
683                                 olddquot2 = xfs_qm_vop_chown(tp, ip,
684                                                         &ip->i_gdquot, gdqp);
685                         }
686                         ip->i_d.di_gid = xfs_kgid_to_gid(gid);
687                         inode->i_gid = gid;
688                 }
689         }
690 
691         if (mask & ATTR_MODE)
692                 xfs_setattr_mode(ip, iattr);
693         if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
694                 xfs_setattr_time(ip, iattr);
695 
696         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
697 
698         XFS_STATS_INC(xs_ig_attrchg);
699 
700         if (mp->m_flags & XFS_MOUNT_WSYNC)
701                 xfs_trans_set_sync(tp);
702         error = xfs_trans_commit(tp);
703 
704         xfs_iunlock(ip, XFS_ILOCK_EXCL);
705 
706         /*
707          * Release any dquot(s) the inode had kept before chown.
708          */
709         xfs_qm_dqrele(olddquot1);
710         xfs_qm_dqrele(olddquot2);
711         xfs_qm_dqrele(udqp);
712         xfs_qm_dqrele(gdqp);
713 
714         if (error)
715                 return error;
716 
717         /*
718          * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
719          *           update.  We could avoid this with linked transactions
720          *           and passing down the transaction pointer all the way
721          *           to attr_set.  No previous user of the generic
722          *           Posix ACL code seems to care about this issue either.
723          */
724         if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
725                 error = posix_acl_chmod(inode, inode->i_mode);
726                 if (error)
727                         return error;
728         }
729 
730         return 0;
731 
732 out_unlock:
733         xfs_iunlock(ip, XFS_ILOCK_EXCL);
734 out_trans_cancel:
735         xfs_trans_cancel(tp);
736         xfs_qm_dqrele(udqp);
737         xfs_qm_dqrele(gdqp);
738         return error;
739 }
740 
741 /*
742  * Truncate file.  Must have write permission and not be a directory.
743  */
744 int
745 xfs_setattr_size(
746         struct xfs_inode        *ip,
747         struct iattr            *iattr)
748 {
749         struct xfs_mount        *mp = ip->i_mount;
750         struct inode            *inode = VFS_I(ip);
751         xfs_off_t               oldsize, newsize;
752         struct xfs_trans        *tp;
753         int                     error;
754         uint                    lock_flags = 0;
755         bool                    did_zeroing = false;
756 
757         trace_xfs_setattr(ip);
758 
759         if (mp->m_flags & XFS_MOUNT_RDONLY)
760                 return -EROFS;
761 
762         if (XFS_FORCED_SHUTDOWN(mp))
763                 return -EIO;
764 
765         error = inode_change_ok(inode, iattr);
766         if (error)
767                 return error;
768 
769         ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
770         ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
771         ASSERT(S_ISREG(ip->i_d.di_mode));
772         ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
773                 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
774 
775         oldsize = inode->i_size;
776         newsize = iattr->ia_size;
777 
778         /*
779          * Short circuit the truncate case for zero length files.
780          */
781         if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
782                 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
783                         return 0;
784 
785                 /*
786                  * Use the regular setattr path to update the timestamps.
787                  */
788                 iattr->ia_valid &= ~ATTR_SIZE;
789                 return xfs_setattr_nonsize(ip, iattr, 0);
790         }
791 
792         /*
793          * Make sure that the dquots are attached to the inode.
794          */
795         error = xfs_qm_dqattach(ip, 0);
796         if (error)
797                 return error;
798 
799         /*
800          * File data changes must be complete before we start the transaction to
801          * modify the inode.  This needs to be done before joining the inode to
802          * the transaction because the inode cannot be unlocked once it is a
803          * part of the transaction.
804          *
805          * Start with zeroing any data block beyond EOF that we may expose on
806          * file extension.
807          */
808         if (newsize > oldsize) {
809                 error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
810                 if (error)
811                         return error;
812         }
813 
814         /*
815          * We are going to log the inode size change in this transaction so
816          * any previous writes that are beyond the on disk EOF and the new
817          * EOF that have not been written out need to be written here.  If we
818          * do not write the data out, we expose ourselves to the null files
819          * problem. Note that this includes any block zeroing we did above;
820          * otherwise those blocks may not be zeroed after a crash.
821          */
822         if (newsize > ip->i_d.di_size &&
823             (oldsize != ip->i_d.di_size || did_zeroing)) {
824                 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
825                                                       ip->i_d.di_size, newsize);
826                 if (error)
827                         return error;
828         }
829 
830         /* Now wait for all direct I/O to complete. */
831         inode_dio_wait(inode);
832 
833         /*
834          * We've already locked out new page faults, so now we can safely remove
835          * pages from the page cache knowing they won't get refaulted until we
836          * drop the XFS_MMAP_EXCL lock after the extent manipulations are
837          * complete. The truncate_setsize() call also cleans partial EOF page
838          * PTEs on extending truncates and hence ensures sub-page block size
839          * filesystems are correctly handled, too.
840          *
841          * We have to do all the page cache truncate work outside the
842          * transaction context as the "lock" order is page lock->log space
843          * reservation as defined by extent allocation in the writeback path.
844          * Hence a truncate can fail with ENOMEM from xfs_trans_reserve(), but
845          * having already truncated the in-memory version of the file (i.e. made
846          * user visible changes). There's not much we can do about this, except
847          * to hope that the caller sees ENOMEM and retries the truncate
848          * operation.
849          */
850         if (IS_DAX(inode))
851                 error = dax_truncate_page(inode, newsize, xfs_get_blocks_direct);
852         else
853                 error = block_truncate_page(inode->i_mapping, newsize,
854                                             xfs_get_blocks);
855         if (error)
856                 return error;
857         truncate_setsize(inode, newsize);
858 
859         tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
860         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
861         if (error)
862                 goto out_trans_cancel;
863 
864         lock_flags |= XFS_ILOCK_EXCL;
865         xfs_ilock(ip, XFS_ILOCK_EXCL);
866         xfs_trans_ijoin(tp, ip, 0);
867 
868         /*
869          * Only change the c/mtime if we are changing the size or we are
870          * explicitly asked to change it.  This handles the semantic difference
871          * between truncate() and ftruncate() as implemented in the VFS.
872          *
873          * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
874          * special case where we need to update the times despite not having
875          * these flags set.  For all other operations the VFS set these flags
876          * explicitly if it wants a timestamp update.
877          */
878         if (newsize != oldsize &&
879             !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
880                 iattr->ia_ctime = iattr->ia_mtime =
881                         current_fs_time(inode->i_sb);
882                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
883         }
884 
885         /*
886          * The first thing we do is set the size to new_size permanently on
887          * disk.  This way we don't have to worry about anyone ever being able
888          * to look at the data being freed even in the face of a crash.
889          * What we're getting around here is the case where we free a block, it
890          * is allocated to another file, it is written to, and then we crash.
891          * If the new data gets written to the file but the log buffers
892          * containing the free and reallocation don't, then we'd end up with
893          * garbage in the blocks being freed.  As long as we make the new size
894          * permanent before actually freeing any blocks it doesn't matter if
895          * they get written to.
896          */
897         ip->i_d.di_size = newsize;
898         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
899 
900         if (newsize <= oldsize) {
901                 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
902                 if (error)
903                         goto out_trans_cancel;
904 
905                 /*
906                  * Truncated "down", so we're removing references to old data
907                  * here - if we delay flushing for a long time, we expose
908                  * ourselves unduly to the notorious NULL files problem.  So,
909                  * we mark this inode and flush it when the file is closed,
910                  * and do not wait the usual (long) time for writeout.
911                  */
912                 xfs_iflags_set(ip, XFS_ITRUNCATED);
913 
914                 /* A truncate down always removes post-EOF blocks. */
915                 xfs_inode_clear_eofblocks_tag(ip);
916         }
917 
918         if (iattr->ia_valid & ATTR_MODE)
919                 xfs_setattr_mode(ip, iattr);
920         if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
921                 xfs_setattr_time(ip, iattr);
922 
923         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
924 
925         XFS_STATS_INC(xs_ig_attrchg);
926 
927         if (mp->m_flags & XFS_MOUNT_WSYNC)
928                 xfs_trans_set_sync(tp);
929 
930         error = xfs_trans_commit(tp);
931 out_unlock:
932         if (lock_flags)
933                 xfs_iunlock(ip, lock_flags);
934         return error;
935 
936 out_trans_cancel:
937         xfs_trans_cancel(tp);
938         goto out_unlock;
939 }
940 
941 STATIC int
942 xfs_vn_setattr(
943         struct dentry           *dentry,
944         struct iattr            *iattr)
945 {
946         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
947         int                     error;
948 
949         if (iattr->ia_valid & ATTR_SIZE) {
950                 uint            iolock = XFS_IOLOCK_EXCL;
951 
952                 xfs_ilock(ip, iolock);
953                 error = xfs_break_layouts(d_inode(dentry), &iolock, true);
954                 if (!error) {
955                         xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
956                         iolock |= XFS_MMAPLOCK_EXCL;
957 
958                         error = xfs_setattr_size(ip, iattr);
959                 }
960                 xfs_iunlock(ip, iolock);
961         } else {
962                 error = xfs_setattr_nonsize(ip, iattr, 0);
963         }
964 
965         return error;
966 }
967 
968 STATIC int
969 xfs_vn_update_time(
970         struct inode            *inode,
971         struct timespec         *now,
972         int                     flags)
973 {
974         struct xfs_inode        *ip = XFS_I(inode);
975         struct xfs_mount        *mp = ip->i_mount;
976         struct xfs_trans        *tp;
977         int                     error;
978 
979         trace_xfs_update_time(ip);
980 
981         tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
982         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0);
983         if (error) {
984                 xfs_trans_cancel(tp);
985                 return error;
986         }
987 
988         xfs_ilock(ip, XFS_ILOCK_EXCL);
989         if (flags & S_CTIME) {
990                 inode->i_ctime = *now;
991                 ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec;
992                 ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec;
993         }
994         if (flags & S_MTIME) {
995                 inode->i_mtime = *now;
996                 ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec;
997                 ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec;
998         }
999         if (flags & S_ATIME) {
1000                 inode->i_atime = *now;
1001                 ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec;
1002                 ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec;
1003         }
1004         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1005         xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
1006         return xfs_trans_commit(tp);
1007 }
1008 
1009 #define XFS_FIEMAP_FLAGS        (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
1010 
1011 /*
1012  * Call fiemap helper to fill in user data.
1013  * Returns positive errors to xfs_getbmap.
1014  */
1015 STATIC int
1016 xfs_fiemap_format(
1017         void                    **arg,
1018         struct getbmapx         *bmv,
1019         int                     *full)
1020 {
1021         int                     error;
1022         struct fiemap_extent_info *fieinfo = *arg;
1023         u32                     fiemap_flags = 0;
1024         u64                     logical, physical, length;
1025 
1026         /* Do nothing for a hole */
1027         if (bmv->bmv_block == -1LL)
1028                 return 0;
1029 
1030         logical = BBTOB(bmv->bmv_offset);
1031         physical = BBTOB(bmv->bmv_block);
1032         length = BBTOB(bmv->bmv_length);
1033 
1034         if (bmv->bmv_oflags & BMV_OF_PREALLOC)
1035                 fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
1036         else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
1037                 fiemap_flags |= (FIEMAP_EXTENT_DELALLOC |
1038                                  FIEMAP_EXTENT_UNKNOWN);
1039                 physical = 0;   /* no block yet */
1040         }
1041         if (bmv->bmv_oflags & BMV_OF_LAST)
1042                 fiemap_flags |= FIEMAP_EXTENT_LAST;
1043 
1044         error = fiemap_fill_next_extent(fieinfo, logical, physical,
1045                                         length, fiemap_flags);
1046         if (error > 0) {
1047                 error = 0;
1048                 *full = 1;      /* user array now full */
1049         }
1050 
1051         return error;
1052 }
1053 
1054 STATIC int
1055 xfs_vn_fiemap(
1056         struct inode            *inode,
1057         struct fiemap_extent_info *fieinfo,
1058         u64                     start,
1059         u64                     length)
1060 {
1061         xfs_inode_t             *ip = XFS_I(inode);
1062         struct getbmapx         bm;
1063         int                     error;
1064 
1065         error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
1066         if (error)
1067                 return error;
1068 
1069         /* Set up bmap header for xfs internal routine */
1070         bm.bmv_offset = BTOBBT(start);
1071         /* Special case for whole file */
1072         if (length == FIEMAP_MAX_OFFSET)
1073                 bm.bmv_length = -1LL;
1074         else
1075                 bm.bmv_length = BTOBB(start + length) - bm.bmv_offset;
1076 
1077         /* We add one because in getbmap world count includes the header */
1078         bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
1079                                         fieinfo->fi_extents_max + 1;
1080         bm.bmv_count = min_t(__s32, bm.bmv_count,
1081                              (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
1082         bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
1083         if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
1084                 bm.bmv_iflags |= BMV_IF_ATTRFORK;
1085         if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
1086                 bm.bmv_iflags |= BMV_IF_DELALLOC;
1087 
1088         error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
1089         if (error)
1090                 return error;
1091 
1092         return 0;
1093 }
1094 
1095 STATIC int
1096 xfs_vn_tmpfile(
1097         struct inode    *dir,
1098         struct dentry   *dentry,
1099         umode_t         mode)
1100 {
1101         return xfs_generic_create(dir, dentry, mode, 0, true);
1102 }
1103 
1104 static const struct inode_operations xfs_inode_operations = {
1105         .get_acl                = xfs_get_acl,
1106         .set_acl                = xfs_set_acl,
1107         .getattr                = xfs_vn_getattr,
1108         .setattr                = xfs_vn_setattr,
1109         .setxattr               = generic_setxattr,
1110         .getxattr               = generic_getxattr,
1111         .removexattr            = generic_removexattr,
1112         .listxattr              = xfs_vn_listxattr,
1113         .fiemap                 = xfs_vn_fiemap,
1114         .update_time            = xfs_vn_update_time,
1115 };
1116 
1117 static const struct inode_operations xfs_dir_inode_operations = {
1118         .create                 = xfs_vn_create,
1119         .lookup                 = xfs_vn_lookup,
1120         .link                   = xfs_vn_link,
1121         .unlink                 = xfs_vn_unlink,
1122         .symlink                = xfs_vn_symlink,
1123         .mkdir                  = xfs_vn_mkdir,
1124         /*
1125          * Yes, XFS uses the same method for rmdir and unlink.
1126          *
1127          * There are some subtile differences deeper in the code,
1128          * but we use S_ISDIR to check for those.
1129          */
1130         .rmdir                  = xfs_vn_unlink,
1131         .mknod                  = xfs_vn_mknod,
1132         .rename2                = xfs_vn_rename,
1133         .get_acl                = xfs_get_acl,
1134         .set_acl                = xfs_set_acl,
1135         .getattr                = xfs_vn_getattr,
1136         .setattr                = xfs_vn_setattr,
1137         .setxattr               = generic_setxattr,
1138         .getxattr               = generic_getxattr,
1139         .removexattr            = generic_removexattr,
1140         .listxattr              = xfs_vn_listxattr,
1141         .update_time            = xfs_vn_update_time,
1142         .tmpfile                = xfs_vn_tmpfile,
1143 };
1144 
1145 static const struct inode_operations xfs_dir_ci_inode_operations = {
1146         .create                 = xfs_vn_create,
1147         .lookup                 = xfs_vn_ci_lookup,
1148         .link                   = xfs_vn_link,
1149         .unlink                 = xfs_vn_unlink,
1150         .symlink                = xfs_vn_symlink,
1151         .mkdir                  = xfs_vn_mkdir,
1152         /*
1153          * Yes, XFS uses the same method for rmdir and unlink.
1154          *
1155          * There are some subtile differences deeper in the code,
1156          * but we use S_ISDIR to check for those.
1157          */
1158         .rmdir                  = xfs_vn_unlink,
1159         .mknod                  = xfs_vn_mknod,
1160         .rename2                = xfs_vn_rename,
1161         .get_acl                = xfs_get_acl,
1162         .set_acl                = xfs_set_acl,
1163         .getattr                = xfs_vn_getattr,
1164         .setattr                = xfs_vn_setattr,
1165         .setxattr               = generic_setxattr,
1166         .getxattr               = generic_getxattr,
1167         .removexattr            = generic_removexattr,
1168         .listxattr              = xfs_vn_listxattr,
1169         .update_time            = xfs_vn_update_time,
1170         .tmpfile                = xfs_vn_tmpfile,
1171 };
1172 
1173 static const struct inode_operations xfs_symlink_inode_operations = {
1174         .readlink               = generic_readlink,
1175         .follow_link            = xfs_vn_follow_link,
1176         .put_link               = kfree_put_link,
1177         .getattr                = xfs_vn_getattr,
1178         .setattr                = xfs_vn_setattr,
1179         .setxattr               = generic_setxattr,
1180         .getxattr               = generic_getxattr,
1181         .removexattr            = generic_removexattr,
1182         .listxattr              = xfs_vn_listxattr,
1183         .update_time            = xfs_vn_update_time,
1184 };
1185 
1186 STATIC void
1187 xfs_diflags_to_iflags(
1188         struct inode            *inode,
1189         struct xfs_inode        *ip)
1190 {
1191         uint16_t                flags = ip->i_d.di_flags;
1192 
1193         inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1194                             S_NOATIME | S_DAX);
1195 
1196         if (flags & XFS_DIFLAG_IMMUTABLE)
1197                 inode->i_flags |= S_IMMUTABLE;
1198         if (flags & XFS_DIFLAG_APPEND)
1199                 inode->i_flags |= S_APPEND;
1200         if (flags & XFS_DIFLAG_SYNC)
1201                 inode->i_flags |= S_SYNC;
1202         if (flags & XFS_DIFLAG_NOATIME)
1203                 inode->i_flags |= S_NOATIME;
1204         /* XXX: Also needs an on-disk per inode flag! */
1205         if (ip->i_mount->m_flags & XFS_MOUNT_DAX)
1206                 inode->i_flags |= S_DAX;
1207 }
1208 
1209 /*
1210  * Initialize the Linux inode and set up the operation vectors.
1211  *
1212  * When reading existing inodes from disk this is called directly from xfs_iget,
1213  * when creating a new inode it is called from xfs_ialloc after setting up the
1214  * inode. These callers have different criteria for clearing XFS_INEW, so leave
1215  * it up to the caller to deal with unlocking the inode appropriately.
1216  */
1217 void
1218 xfs_setup_inode(
1219         struct xfs_inode        *ip)
1220 {
1221         struct inode            *inode = &ip->i_vnode;
1222         gfp_t                   gfp_mask;
1223 
1224         inode->i_ino = ip->i_ino;
1225         inode->i_state = I_NEW;
1226 
1227         inode_sb_list_add(inode);
1228         /* make the inode look hashed for the writeback code */
1229         hlist_add_fake(&inode->i_hash);
1230 
1231         inode->i_mode   = ip->i_d.di_mode;
1232         set_nlink(inode, ip->i_d.di_nlink);
1233         inode->i_uid    = xfs_uid_to_kuid(ip->i_d.di_uid);
1234         inode->i_gid    = xfs_gid_to_kgid(ip->i_d.di_gid);
1235 
1236         switch (inode->i_mode & S_IFMT) {
1237         case S_IFBLK:
1238         case S_IFCHR:
1239                 inode->i_rdev =
1240                         MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
1241                               sysv_minor(ip->i_df.if_u2.if_rdev));
1242                 break;
1243         default:
1244                 inode->i_rdev = 0;
1245                 break;
1246         }
1247 
1248         inode->i_generation = ip->i_d.di_gen;
1249         i_size_write(inode, ip->i_d.di_size);
1250         inode->i_atime.tv_sec   = ip->i_d.di_atime.t_sec;
1251         inode->i_atime.tv_nsec  = ip->i_d.di_atime.t_nsec;
1252         inode->i_mtime.tv_sec   = ip->i_d.di_mtime.t_sec;
1253         inode->i_mtime.tv_nsec  = ip->i_d.di_mtime.t_nsec;
1254         inode->i_ctime.tv_sec   = ip->i_d.di_ctime.t_sec;
1255         inode->i_ctime.tv_nsec  = ip->i_d.di_ctime.t_nsec;
1256         xfs_diflags_to_iflags(inode, ip);
1257 
1258         ip->d_ops = ip->i_mount->m_nondir_inode_ops;
1259         lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1260         switch (inode->i_mode & S_IFMT) {
1261         case S_IFREG:
1262                 inode->i_op = &xfs_inode_operations;
1263                 inode->i_fop = &xfs_file_operations;
1264                 inode->i_mapping->a_ops = &xfs_address_space_operations;
1265                 break;
1266         case S_IFDIR:
1267                 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1268                 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1269                         inode->i_op = &xfs_dir_ci_inode_operations;
1270                 else
1271                         inode->i_op = &xfs_dir_inode_operations;
1272                 inode->i_fop = &xfs_dir_file_operations;
1273                 ip->d_ops = ip->i_mount->m_dir_inode_ops;
1274                 break;
1275         case S_IFLNK:
1276                 inode->i_op = &xfs_symlink_inode_operations;
1277                 if (!(ip->i_df.if_flags & XFS_IFINLINE))
1278                         inode->i_mapping->a_ops = &xfs_address_space_operations;
1279                 break;
1280         default:
1281                 inode->i_op = &xfs_inode_operations;
1282                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1283                 break;
1284         }
1285 
1286         /*
1287          * Ensure all page cache allocations are done from GFP_NOFS context to
1288          * prevent direct reclaim recursion back into the filesystem and blowing
1289          * stacks or deadlocking.
1290          */
1291         gfp_mask = mapping_gfp_mask(inode->i_mapping);
1292         mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1293 
1294         /*
1295          * If there is no attribute fork no ACL can exist on this inode,
1296          * and it can't have any file capabilities attached to it either.
1297          */
1298         if (!XFS_IFORK_Q(ip)) {
1299                 inode_has_no_xattr(inode);
1300                 cache_no_acl(inode);
1301         }
1302 }
1303 

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