fs/xfs/xfs_iops.c

   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 #include "xfs_error.h"
  24
  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                 struct xfs_da_args      args = {
  53                         .dp             = ip,
  54                         .attr_filter    = XFS_ATTR_SECURE,
  55                         .name           = xattr->name,
  56                         .namelen        = strlen(xattr->name),
  57                         .value          = xattr->value,
  58                         .valuelen       = xattr->value_len,
  59                 };
  60                 error = xfs_attr_set(&args);
  61                 if (error < 0)
  62                         break;
  63         }
  64         return error;
  65 }
  66
  67 /*
  68  * Hook in SELinux.  This is not quite correct yet, what we really need
  69  * here (as we do for default ACLs) is a mechanism by which creation of
  70  * these attrs can be journalled at inode creation time (along with the
  71  * inode, of course, such that log replay can't cause these to be lost).
  72  */
  73
  74 STATIC int
  75 xfs_init_security(
  76         struct inode    *inode,
  77         struct inode    *dir,
  78         const struct qstr *qstr)
  79 {
  80         return security_inode_init_security(inode, dir, qstr,
  81                                              &xfs_initxattrs, NULL);
  82 }
  83
  84 static void
  85 xfs_dentry_to_name(
  86         struct xfs_name *namep,
  87         struct dentry   *dentry)
  88 {
  89         namep->name = dentry->d_name.name;
  90         namep->len = dentry->d_name.len;
  91         namep->type = XFS_DIR3_FT_UNKNOWN;
  92 }
  93
  94 static int
  95 xfs_dentry_mode_to_name(
  96         struct xfs_name *namep,
  97         struct dentry   *dentry,
  98         int             mode)
  99 {
 100         namep->name = dentry->d_name.name;
 101         namep->len = dentry->d_name.len;
 102         namep->type = xfs_mode_to_ftype(mode);
 103
 104         if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
 105                 return -EFSCORRUPTED;
 106
 107         return 0;
 108 }
 109
 110 STATIC void
 111 xfs_cleanup_inode(
 112         struct inode    *dir,
 113         struct inode    *inode,
 114         struct dentry   *dentry)
 115 {
 116         struct xfs_name teardown;
 117
 118         /* Oh, the horror.
 119          * If we can't add the ACL or we fail in
 120          * xfs_init_security we must back out.
 121          * ENOSPC can hit here, among other things.
 122          */
 123         xfs_dentry_to_name(&teardown, dentry);
 124
 125         xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
 126 }
 127
 128 STATIC int
 129 xfs_generic_create(
 130         struct inode    *dir,
 131         struct dentry   *dentry,
 132         umode_t         mode,
 133         dev_t           rdev,
 134         bool            tmpfile)        /* unnamed file */
 135 {
 136         struct inode    *inode;
 137         struct xfs_inode *ip = NULL;
 138         struct posix_acl *default_acl, *acl;
 139         struct xfs_name name;
 140         int             error;
 141
 142         /*
 143          * Irix uses Missed'em'V split, but doesn't want to see
 144          * the upper 5 bits of (14bit) major.
 145          */
 146         if (S_ISCHR(mode) || S_ISBLK(mode)) {
 147                 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
 148                         return -EINVAL;
 149         } else {
 150                 rdev = 0;
 151         }
 152
 153         error = posix_acl_create(dir, &mode, &default_acl, &acl);
 154         if (error)
 155                 return error;
 156
 157         /* Verify mode is valid also for tmpfile case */
 158         error = xfs_dentry_mode_to_name(&name, dentry, mode);
 159         if (unlikely(error))
 160                 goto out_free_acl;
 161
 162         if (!tmpfile) {
 163                 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
 164         } else {
 165                 error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
 166         }
 167         if (unlikely(error))
 168                 goto out_free_acl;
 169
 170         inode = VFS_I(ip);
 171
 172         error = xfs_init_security(inode, dir, &dentry->d_name);
 173         if (unlikely(error))
 174                 goto out_cleanup_inode;
 175
 176 #ifdef CONFIG_XFS_POSIX_ACL
 177         if (default_acl) {
 178                 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 179                 if (error)
 180                         goto out_cleanup_inode;
 181         }
 182         if (acl) {
 183                 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
 184                 if (error)
 185                         goto out_cleanup_inode;
 186         }
 187 #endif
 188
 189         xfs_setup_iops(ip);
 190
 191         if (tmpfile) {
 192                 /*
 193                  * The VFS requires that any inode fed to d_tmpfile must have
 194                  * nlink == 1 so that it can decrement the nlink in d_tmpfile.
 195                  * However, we created the temp file with nlink == 0 because
 196                  * we're not allowed to put an inode with nlink > 0 on the
 197                  * unlinked list.  Therefore we have to set nlink to 1 so that
 198                  * d_tmpfile can immediately set it back to zero.
 199                  */
 200                 set_nlink(inode, 1);
 201                 d_tmpfile(dentry, inode);
 202         } else
 203                 d_instantiate(dentry, inode);
 204
 205         xfs_finish_inode_setup(ip);
 206
 207  out_free_acl:
 208         if (default_acl)
 209                 posix_acl_release(default_acl);
 210         if (acl)
 211                 posix_acl_release(acl);
 212         return error;
 213
 214  out_cleanup_inode:
 215         xfs_finish_inode_setup(ip);
 216         if (!tmpfile)
 217                 xfs_cleanup_inode(dir, inode, dentry);
 218         xfs_irele(ip);
 219         goto out_free_acl;
 220 }
 221
 222 STATIC int
 223 xfs_vn_mknod(
 224         struct inode    *dir,
 225         struct dentry   *dentry,
 226         umode_t         mode,
 227         dev_t           rdev)
 228 {
 229         return xfs_generic_create(dir, dentry, mode, rdev, false);
 230 }
 231
 232 STATIC int
 233 xfs_vn_create(
 234         struct inode    *dir,
 235         struct dentry   *dentry,
 236         umode_t         mode,
 237         bool            flags)
 238 {
 239         return xfs_vn_mknod(dir, dentry, mode, 0);
 240 }
 241
 242 STATIC int
 243 xfs_vn_mkdir(
 244         struct inode    *dir,
 245         struct dentry   *dentry,
 246         umode_t         mode)
 247 {
 248         return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
 249 }
 250
 251 STATIC struct dentry *
 252 xfs_vn_lookup(
 253         struct inode    *dir,
 254         struct dentry   *dentry,
 255         unsigned int flags)
 256 {
 257         struct inode *inode;
 258         struct xfs_inode *cip;
 259         struct xfs_name name;
 260         int             error;
 261
 262         if (dentry->d_name.len >= MAXNAMELEN)
 263                 return ERR_PTR(-ENAMETOOLONG);
 264
 265         xfs_dentry_to_name(&name, dentry);
 266         error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
 267         if (likely(!error))
 268                 inode = VFS_I(cip);
 269         else if (likely(error == -ENOENT))
 270                 inode = NULL;
 271         else
 272                 inode = ERR_PTR(error);
 273         return d_splice_alias(inode, dentry);
 274 }
 275
 276 STATIC struct dentry *
 277 xfs_vn_ci_lookup(
 278         struct inode    *dir,
 279         struct dentry   *dentry,
 280         unsigned int flags)
 281 {
 282         struct xfs_inode *ip;
 283         struct xfs_name xname;
 284         struct xfs_name ci_name;
 285         struct qstr     dname;
 286         int             error;
 287
 288         if (dentry->d_name.len >= MAXNAMELEN)
 289                 return ERR_PTR(-ENAMETOOLONG);
 290
 291         xfs_dentry_to_name(&xname, dentry);
 292         error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
 293         if (unlikely(error)) {
 294                 if (unlikely(error != -ENOENT))
 295                         return ERR_PTR(error);
 296                 /*
 297                  * call d_add(dentry, NULL) here when d_drop_negative_children
 298                  * is called in xfs_vn_mknod (ie. allow negative dentries
 299                  * with CI filesystems).
 300                  */
 301                 return NULL;
 302         }
 303
 304         /* if exact match, just splice and exit */
 305         if (!ci_name.name)
 306                 return d_splice_alias(VFS_I(ip), dentry);
 307
 308         /* else case-insensitive match... */
 309         dname.name = ci_name.name;
 310         dname.len = ci_name.len;
 311         dentry = d_add_ci(dentry, VFS_I(ip), &dname);
 312         kmem_free(ci_name.name);
 313         return dentry;
 314 }
 315
 316 STATIC int
 317 xfs_vn_link(
 318         struct dentry   *old_dentry,
 319         struct inode    *dir,
 320         struct dentry   *dentry)
 321 {
 322         struct inode    *inode = d_inode(old_dentry);
 323         struct xfs_name name;
 324         int             error;
 325
 326         error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
 327         if (unlikely(error))
 328                 return error;
 329
 330         error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
 331         if (unlikely(error))
 332                 return error;
 333
 334         ihold(inode);
 335         d_instantiate(dentry, inode);
 336         return 0;
 337 }
 338
 339 STATIC int
 340 xfs_vn_unlink(
 341         struct inode    *dir,
 342         struct dentry   *dentry)
 343 {
 344         struct xfs_name name;
 345         int             error;
 346
 347         xfs_dentry_to_name(&name, dentry);
 348
 349         error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
 350         if (error)
 351                 return error;
 352
 353         /*
 354          * With unlink, the VFS makes the dentry "negative": no inode,
 355          * but still hashed. This is incompatible with case-insensitive
 356          * mode, so invalidate (unhash) the dentry in CI-mode.
 357          */
 358         if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
 359                 d_invalidate(dentry);
 360         return 0;
 361 }
 362
 363 STATIC int
 364 xfs_vn_symlink(
 365         struct inode    *dir,
 366         struct dentry   *dentry,
 367         const char      *symname)
 368 {
 369         struct inode    *inode;
 370         struct xfs_inode *cip = NULL;
 371         struct xfs_name name;
 372         int             error;
 373         umode_t         mode;
 374
 375         mode = S_IFLNK |
 376                 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
 377         error = xfs_dentry_mode_to_name(&name, dentry, mode);
 378         if (unlikely(error))
 379                 goto out;
 380
 381         error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
 382         if (unlikely(error))
 383                 goto out;
 384
 385         inode = VFS_I(cip);
 386
 387         error = xfs_init_security(inode, dir, &dentry->d_name);
 388         if (unlikely(error))
 389                 goto out_cleanup_inode;
 390
 391         xfs_setup_iops(cip);
 392
 393         d_instantiate(dentry, inode);
 394         xfs_finish_inode_setup(cip);
 395         return 0;
 396
 397  out_cleanup_inode:
 398         xfs_finish_inode_setup(cip);
 399         xfs_cleanup_inode(dir, inode, dentry);
 400         xfs_irele(cip);
 401  out:
 402         return error;
 403 }
 404
 405 STATIC int
 406 xfs_vn_rename(
 407         struct inode    *odir,
 408         struct dentry   *odentry,
 409         struct inode    *ndir,
 410         struct dentry   *ndentry,
 411         unsigned int    flags)
 412 {
 413         struct inode    *new_inode = d_inode(ndentry);
 414         int             omode = 0;
 415         int             error;
 416         struct xfs_name oname;
 417         struct xfs_name nname;
 418
 419         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 420                 return -EINVAL;
 421
 422         /* if we are exchanging files, we need to set i_mode of both files */
 423         if (flags & RENAME_EXCHANGE)
 424                 omode = d_inode(ndentry)->i_mode;
 425
 426         error = xfs_dentry_mode_to_name(&oname, odentry, omode);
 427         if (omode && unlikely(error))
 428                 return error;
 429
 430         error = xfs_dentry_mode_to_name(&nname, ndentry,
 431                                         d_inode(odentry)->i_mode);
 432         if (unlikely(error))
 433                 return error;
 434
 435         return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
 436                           XFS_I(ndir), &nname,
 437                           new_inode ? XFS_I(new_inode) : NULL, flags);
 438 }
 439
 440 /*
 441  * careful here - this function can get called recursively, so
 442  * we need to be very careful about how much stack we use.
 443  * uio is kmalloced for this reason...
 444  */
 445 STATIC const char *
 446 xfs_vn_get_link(
 447         struct dentry           *dentry,
 448         struct inode            *inode,
 449         struct delayed_call     *done)
 450 {
 451         char                    *link;
 452         int                     error = -ENOMEM;
 453
 454         if (!dentry)
 455                 return ERR_PTR(-ECHILD);
 456
 457         link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
 458         if (!link)
 459                 goto out_err;
 460
 461         error = xfs_readlink(XFS_I(d_inode(dentry)), link);
 462         if (unlikely(error))
 463                 goto out_kfree;
 464
 465         set_delayed_call(done, kfree_link, link);
 466         return link;
 467
 468  out_kfree:
 469         kfree(link);
 470  out_err:
 471         return ERR_PTR(error);
 472 }
 473
 474 STATIC const char *
 475 xfs_vn_get_link_inline(
 476         struct dentry           *dentry,
 477         struct inode            *inode,
 478         struct delayed_call     *done)
 479 {
 480         struct xfs_inode        *ip = XFS_I(inode);
 481         char                    *link;
 482
 483         ASSERT(ip->i_df.if_flags & XFS_IFINLINE);
 484
 485         /*
 486          * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
 487          * if_data is junk.
 488          */
 489         link = ip->i_df.if_u1.if_data;
 490         if (XFS_IS_CORRUPT(ip->i_mount, !link))
 491                 return ERR_PTR(-EFSCORRUPTED);
 492         return link;
 493 }
 494
 495 static uint32_t
 496 xfs_stat_blksize(
 497         struct xfs_inode        *ip)
 498 {
 499         struct xfs_mount        *mp = ip->i_mount;
 500
 501         /*
 502          * If the file blocks are being allocated from a realtime volume, then
 503          * always return the realtime extent size.
 504          */
 505         if (XFS_IS_REALTIME_INODE(ip))
 506                 return xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
 507
 508         /*
 509          * Allow large block sizes to be reported to userspace programs if the
 510          * "largeio" mount option is used.
 511          *
 512          * If compatibility mode is specified, simply return the basic unit of
 513          * caching so that we don't get inefficient read/modify/write I/O from
 514          * user apps. Otherwise....
 515          *
 516          * If the underlying volume is a stripe, then return the stripe width in
 517          * bytes as the recommended I/O size. It is not a stripe and we've set a
 518          * default buffered I/O size, return that, otherwise return the compat
 519          * default.
 520          */
 521         if (mp->m_flags & XFS_MOUNT_LARGEIO) {
 522                 if (mp->m_swidth)
 523                         return mp->m_swidth << mp->m_sb.sb_blocklog;
 524                 if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
 525                         return 1U << mp->m_allocsize_log;
 526         }
 527
 528         return PAGE_SIZE;
 529 }
 530
 531 STATIC int
 532 xfs_vn_getattr(
 533         const struct path       *path,
 534         struct kstat            *stat,
 535         u32                     request_mask,
 536         unsigned int            query_flags)
 537 {
 538         struct inode            *inode = d_inode(path->dentry);
 539         struct xfs_inode        *ip = XFS_I(inode);
 540         struct xfs_mount        *mp = ip->i_mount;
 541
 542         trace_xfs_getattr(ip);
 543
 544         if (XFS_FORCED_SHUTDOWN(mp))
 545                 return -EIO;
 546
 547         stat->size = XFS_ISIZE(ip);
 548         stat->dev = inode->i_sb->s_dev;
 549         stat->mode = inode->i_mode;
 550         stat->nlink = inode->i_nlink;
 551         stat->uid = inode->i_uid;
 552         stat->gid = inode->i_gid;
 553         stat->ino = ip->i_ino;
 554         stat->atime = inode->i_atime;
 555         stat->mtime = inode->i_mtime;
 556         stat->ctime = inode->i_ctime;
 557         stat->blocks =
 558                 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
 559
 560         if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
 561                 if (request_mask & STATX_BTIME) {
 562                         stat->result_mask |= STATX_BTIME;
 563                         stat->btime = ip->i_d.di_crtime;
 564                 }
 565         }
 566
 567         /*
 568          * Note: If you add another clause to set an attribute flag, please
 569          * update attributes_mask below.
 570          */
 571         if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
 572                 stat->attributes |= STATX_ATTR_IMMUTABLE;
 573         if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
 574                 stat->attributes |= STATX_ATTR_APPEND;
 575         if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
 576                 stat->attributes |= STATX_ATTR_NODUMP;
 577
 578         stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
 579                                   STATX_ATTR_APPEND |
 580                                   STATX_ATTR_NODUMP);
 581
 582         switch (inode->i_mode & S_IFMT) {
 583         case S_IFBLK:
 584         case S_IFCHR:
 585                 stat->blksize = BLKDEV_IOSIZE;
 586                 stat->rdev = inode->i_rdev;
 587                 break;
 588         default:
 589                 stat->blksize = xfs_stat_blksize(ip);
 590                 stat->rdev = 0;
 591                 break;
 592         }
 593
 594         return 0;
 595 }
 596
 597 static void
 598 xfs_setattr_mode(
 599         struct xfs_inode        *ip,
 600         struct iattr            *iattr)
 601 {
 602         struct inode            *inode = VFS_I(ip);
 603         umode_t                 mode = iattr->ia_mode;
 604
 605         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 606
 607         inode->i_mode &= S_IFMT;
 608         inode->i_mode |= mode & ~S_IFMT;
 609 }
 610
 611 void
 612 xfs_setattr_time(
 613         struct xfs_inode        *ip,
 614         struct iattr            *iattr)
 615 {
 616         struct inode            *inode = VFS_I(ip);
 617
 618         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 619
 620         if (iattr->ia_valid & ATTR_ATIME)
 621                 inode->i_atime = iattr->ia_atime;
 622         if (iattr->ia_valid & ATTR_CTIME)
 623                 inode->i_ctime = iattr->ia_ctime;
 624         if (iattr->ia_valid & ATTR_MTIME)
 625                 inode->i_mtime = iattr->ia_mtime;
 626 }
 627
 628 static int
 629 xfs_vn_change_ok(
 630         struct dentry   *dentry,
 631         struct iattr    *iattr)
 632 {
 633         struct xfs_mount        *mp = XFS_I(d_inode(dentry))->i_mount;
 634
 635         if (mp->m_flags & XFS_MOUNT_RDONLY)
 636                 return -EROFS;
 637
 638         if (XFS_FORCED_SHUTDOWN(mp))
 639                 return -EIO;
 640
 641         return setattr_prepare(dentry, iattr);
 642 }
 643
 644 /*
 645  * Set non-size attributes of an inode.
 646  *
 647  * Caution: The caller of this function is responsible for calling
 648  * setattr_prepare() or otherwise verifying the change is fine.
 649  */
 650 int
 651 xfs_setattr_nonsize(
 652         struct xfs_inode        *ip,
 653         struct iattr            *iattr,
 654         int                     flags)
 655 {
 656         xfs_mount_t             *mp = ip->i_mount;
 657         struct inode            *inode = VFS_I(ip);
 658         int                     mask = iattr->ia_valid;
 659         xfs_trans_t             *tp;
 660         int                     error;
 661         kuid_t                  uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
 662         kgid_t                  gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
 663         struct xfs_dquot        *udqp = NULL, *gdqp = NULL;
 664         struct xfs_dquot        *olddquot1 = NULL, *olddquot2 = NULL;
 665
 666         ASSERT((mask & ATTR_SIZE) == 0);
 667
 668         /*
 669          * If disk quotas is on, we make sure that the dquots do exist on disk,
 670          * before we start any other transactions. Trying to do this later
 671          * is messy. We don't care to take a readlock to look at the ids
 672          * in inode here, because we can't hold it across the trans_reserve.
 673          * If the IDs do change before we take the ilock, we're covered
 674          * because the i_*dquot fields will get updated anyway.
 675          */
 676         if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
 677                 uint    qflags = 0;
 678
 679                 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
 680                         uid = iattr->ia_uid;
 681                         qflags |= XFS_QMOPT_UQUOTA;
 682                 } else {
 683                         uid = inode->i_uid;
 684                 }
 685                 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
 686                         gid = iattr->ia_gid;
 687                         qflags |= XFS_QMOPT_GQUOTA;
 688                 }  else {
 689                         gid = inode->i_gid;
 690                 }
 691
 692                 /*
 693                  * We take a reference when we initialize udqp and gdqp,
 694                  * so it is important that we never blindly double trip on
 695                  * the same variable. See xfs_create() for an example.
 696                  */
 697                 ASSERT(udqp == NULL);
 698                 ASSERT(gdqp == NULL);
 699                 error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_d.di_projid,
 700                                            qflags, &udqp, &gdqp, NULL);
 701                 if (error)
 702                         return error;
 703         }
 704
 705         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
 706         if (error)
 707                 goto out_dqrele;
 708
 709         xfs_ilock(ip, XFS_ILOCK_EXCL);
 710         xfs_trans_ijoin(tp, ip, 0);
 711
 712         /*
 713          * Change file ownership.  Must be the owner or privileged.
 714          */
 715         if (mask & (ATTR_UID|ATTR_GID)) {
 716                 /*
 717                  * These IDs could have changed since we last looked at them.
 718                  * But, we're assured that if the ownership did change
 719                  * while we didn't have the inode locked, inode's dquot(s)
 720                  * would have changed also.
 721                  */
 722                 iuid = inode->i_uid;
 723                 igid = inode->i_gid;
 724                 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
 725                 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
 726
 727                 /*
 728                  * Do a quota reservation only if uid/gid is actually
 729                  * going to change.
 730                  */
 731                 if (XFS_IS_QUOTA_RUNNING(mp) &&
 732                     ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
 733                      (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
 734                         ASSERT(tp);
 735                         error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
 736                                                 NULL, capable(CAP_FOWNER) ?
 737                                                 XFS_QMOPT_FORCE_RES : 0);
 738                         if (error)      /* out of quota */
 739                                 goto out_cancel;
 740                 }
 741         }
 742
 743         /*
 744          * Change file ownership.  Must be the owner or privileged.
 745          */
 746         if (mask & (ATTR_UID|ATTR_GID)) {
 747                 /*
 748                  * CAP_FSETID overrides the following restrictions:
 749                  *
 750                  * The set-user-ID and set-group-ID bits of a file will be
 751                  * cleared upon successful return from chown()
 752                  */
 753                 if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
 754                     !capable(CAP_FSETID))
 755                         inode->i_mode &= ~(S_ISUID|S_ISGID);
 756
 757                 /*
 758                  * Change the ownerships and register quota modifications
 759                  * in the transaction.
 760                  */
 761                 if (!uid_eq(iuid, uid)) {
 762                         if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
 763                                 ASSERT(mask & ATTR_UID);
 764                                 ASSERT(udqp);
 765                                 olddquot1 = xfs_qm_vop_chown(tp, ip,
 766                                                         &ip->i_udquot, udqp);
 767                         }
 768                         inode->i_uid = uid;
 769                 }
 770                 if (!gid_eq(igid, gid)) {
 771                         if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
 772                                 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
 773                                        !XFS_IS_PQUOTA_ON(mp));
 774                                 ASSERT(mask & ATTR_GID);
 775                                 ASSERT(gdqp);
 776                                 olddquot2 = xfs_qm_vop_chown(tp, ip,
 777                                                         &ip->i_gdquot, gdqp);
 778                         }
 779                         inode->i_gid = gid;
 780                 }
 781         }
 782
 783         if (mask & ATTR_MODE)
 784                 xfs_setattr_mode(ip, iattr);
 785         if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
 786                 xfs_setattr_time(ip, iattr);
 787
 788         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 789
 790         XFS_STATS_INC(mp, xs_ig_attrchg);
 791
 792         if (mp->m_flags & XFS_MOUNT_WSYNC)
 793                 xfs_trans_set_sync(tp);
 794         error = xfs_trans_commit(tp);
 795
 796         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 797
 798         /*
 799          * Release any dquot(s) the inode had kept before chown.
 800          */
 801         xfs_qm_dqrele(olddquot1);
 802         xfs_qm_dqrele(olddquot2);
 803         xfs_qm_dqrele(udqp);
 804         xfs_qm_dqrele(gdqp);
 805
 806         if (error)
 807                 return error;
 808
 809         /*
 810          * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
 811          *           update.  We could avoid this with linked transactions
 812          *           and passing down the transaction pointer all the way
 813          *           to attr_set.  No previous user of the generic
 814          *           Posix ACL code seems to care about this issue either.
 815          */
 816         if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
 817                 error = posix_acl_chmod(inode, inode->i_mode);
 818                 if (error)
 819                         return error;
 820         }
 821
 822         return 0;
 823
 824 out_cancel:
 825         xfs_trans_cancel(tp);
 826         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 827 out_dqrele:
 828         xfs_qm_dqrele(udqp);
 829         xfs_qm_dqrele(gdqp);
 830         return error;
 831 }
 832
 833 int
 834 xfs_vn_setattr_nonsize(
 835         struct dentry           *dentry,
 836         struct iattr            *iattr)
 837 {
 838         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
 839         int error;
 840
 841         trace_xfs_setattr(ip);
 842
 843         error = xfs_vn_change_ok(dentry, iattr);
 844         if (error)
 845                 return error;
 846         return xfs_setattr_nonsize(ip, iattr, 0);
 847 }
 848
 849 /*
 850  * Truncate file.  Must have write permission and not be a directory.
 851  *
 852  * Caution: The caller of this function is responsible for calling
 853  * setattr_prepare() or otherwise verifying the change is fine.
 854  */
 855 STATIC int
 856 xfs_setattr_size(
 857         struct xfs_inode        *ip,
 858         struct iattr            *iattr)
 859 {
 860         struct xfs_mount        *mp = ip->i_mount;
 861         struct inode            *inode = VFS_I(ip);
 862         xfs_off_t               oldsize, newsize;
 863         struct xfs_trans        *tp;
 864         int                     error;
 865         uint                    lock_flags = 0;
 866         bool                    did_zeroing = false;
 867
 868         ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
 869         ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
 870         ASSERT(S_ISREG(inode->i_mode));
 871         ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
 872                 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
 873
 874         oldsize = inode->i_size;
 875         newsize = iattr->ia_size;
 876
 877         /*
 878          * Short circuit the truncate case for zero length files.
 879          */
 880         if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
 881                 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
 882                         return 0;
 883
 884                 /*
 885                  * Use the regular setattr path to update the timestamps.
 886                  */
 887                 iattr->ia_valid &= ~ATTR_SIZE;
 888                 return xfs_setattr_nonsize(ip, iattr, 0);
 889         }
 890
 891         /*
 892          * Make sure that the dquots are attached to the inode.
 893          */
 894         error = xfs_qm_dqattach(ip);
 895         if (error)
 896                 return error;
 897
 898         /*
 899          * Wait for all direct I/O to complete.
 900          */
 901         inode_dio_wait(inode);
 902
 903         /*
 904          * File data changes must be complete before we start the transaction to
 905          * modify the inode.  This needs to be done before joining the inode to
 906          * the transaction because the inode cannot be unlocked once it is a
 907          * part of the transaction.
 908          *
 909          * Start with zeroing any data beyond EOF that we may expose on file
 910          * extension, or zeroing out the rest of the block on a downward
 911          * truncate.
 912          */
 913         if (newsize > oldsize) {
 914                 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
 915                 error = iomap_zero_range(inode, oldsize, newsize - oldsize,
 916                                 &did_zeroing, &xfs_buffered_write_iomap_ops);
 917         } else {
 918                 error = iomap_truncate_page(inode, newsize, &did_zeroing,
 919                                 &xfs_buffered_write_iomap_ops);
 920         }
 921
 922         if (error)
 923                 return error;
 924
 925         /*
 926          * We've already locked out new page faults, so now we can safely remove
 927          * pages from the page cache knowing they won't get refaulted until we
 928          * drop the XFS_MMAP_EXCL lock after the extent manipulations are
 929          * complete. The truncate_setsize() call also cleans partial EOF page
 930          * PTEs on extending truncates and hence ensures sub-page block size
 931          * filesystems are correctly handled, too.
 932          *
 933          * We have to do all the page cache truncate work outside the
 934          * transaction context as the "lock" order is page lock->log space
 935          * reservation as defined by extent allocation in the writeback path.
 936          * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
 937          * having already truncated the in-memory version of the file (i.e. made
 938          * user visible changes). There's not much we can do about this, except
 939          * to hope that the caller sees ENOMEM and retries the truncate
 940          * operation.
 941          *
 942          * And we update in-core i_size and truncate page cache beyond newsize
 943          * before writeback the [di_size, newsize] range, so we're guaranteed
 944          * not to write stale data past the new EOF on truncate down.
 945          */
 946         truncate_setsize(inode, newsize);
 947
 948         /*
 949          * We are going to log the inode size change in this transaction so
 950          * any previous writes that are beyond the on disk EOF and the new
 951          * EOF that have not been written out need to be written here.  If we
 952          * do not write the data out, we expose ourselves to the null files
 953          * problem. Note that this includes any block zeroing we did above;
 954          * otherwise those blocks may not be zeroed after a crash.
 955          */
 956         if (did_zeroing ||
 957             (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
 958                 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
 959                                                 ip->i_d.di_size, newsize - 1);
 960                 if (error)
 961                         return error;
 962         }
 963
 964         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
 965         if (error)
 966                 return error;
 967
 968         lock_flags |= XFS_ILOCK_EXCL;
 969         xfs_ilock(ip, XFS_ILOCK_EXCL);
 970         xfs_trans_ijoin(tp, ip, 0);
 971
 972         /*
 973          * Only change the c/mtime if we are changing the size or we are
 974          * explicitly asked to change it.  This handles the semantic difference
 975          * between truncate() and ftruncate() as implemented in the VFS.
 976          *
 977          * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
 978          * special case where we need to update the times despite not having
 979          * these flags set.  For all other operations the VFS set these flags
 980          * explicitly if it wants a timestamp update.
 981          */
 982         if (newsize != oldsize &&
 983             !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
 984                 iattr->ia_ctime = iattr->ia_mtime =
 985                         current_time(inode);
 986                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 987         }
 988
 989         /*
 990          * The first thing we do is set the size to new_size permanently on
 991          * disk.  This way we don't have to worry about anyone ever being able
 992          * to look at the data being freed even in the face of a crash.
 993          * What we're getting around here is the case where we free a block, it
 994          * is allocated to another file, it is written to, and then we crash.
 995          * If the new data gets written to the file but the log buffers
 996          * containing the free and reallocation don't, then we'd end up with
 997          * garbage in the blocks being freed.  As long as we make the new size
 998          * permanent before actually freeing any blocks it doesn't matter if
 999          * they get written to.
1000          */
1001         ip->i_d.di_size = newsize;
1002         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1003
1004         if (newsize <= oldsize) {
1005                 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
1006                 if (error)
1007                         goto out_trans_cancel;
1008
1009                 /*
1010                  * Truncated "down", so we're removing references to old data
1011                  * here - if we delay flushing for a long time, we expose
1012                  * ourselves unduly to the notorious NULL files problem.  So,
1013                  * we mark this inode and flush it when the file is closed,
1014                  * and do not wait the usual (long) time for writeout.
1015                  */
1016                 xfs_iflags_set(ip, XFS_ITRUNCATED);
1017
1018                 /* A truncate down always removes post-EOF blocks. */
1019                 xfs_inode_clear_eofblocks_tag(ip);
1020         }
1021
1022         if (iattr->ia_valid & ATTR_MODE)
1023                 xfs_setattr_mode(ip, iattr);
1024         if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
1025                 xfs_setattr_time(ip, iattr);
1026
1027         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1028
1029         XFS_STATS_INC(mp, xs_ig_attrchg);
1030
1031         if (mp->m_flags & XFS_MOUNT_WSYNC)
1032                 xfs_trans_set_sync(tp);
1033
1034         error = xfs_trans_commit(tp);
1035 out_unlock:
1036         if (lock_flags)
1037                 xfs_iunlock(ip, lock_flags);
1038         return error;
1039
1040 out_trans_cancel:
1041         xfs_trans_cancel(tp);
1042         goto out_unlock;
1043 }
1044
1045 int
1046 xfs_vn_setattr_size(
1047         struct dentry           *dentry,
1048         struct iattr            *iattr)
1049 {
1050         struct xfs_inode        *ip = XFS_I(d_inode(dentry));
1051         int error;
1052
1053         trace_xfs_setattr(ip);
1054
1055         error = xfs_vn_change_ok(dentry, iattr);
1056         if (error)
1057                 return error;
1058         return xfs_setattr_size(ip, iattr);
1059 }
1060
1061 STATIC int
1062 xfs_vn_setattr(
1063         struct dentry           *dentry,
1064         struct iattr            *iattr)
1065 {
1066         int                     error;
1067
1068         if (iattr->ia_valid & ATTR_SIZE) {
1069                 struct inode            *inode = d_inode(dentry);
1070                 struct xfs_inode        *ip = XFS_I(inode);
1071                 uint                    iolock;
1072
1073                 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1074                 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1075
1076                 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1077                 if (error) {
1078                         xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1079                         return error;
1080                 }
1081
1082                 error = xfs_vn_setattr_size(dentry, iattr);
1083                 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1084         } else {
1085                 error = xfs_vn_setattr_nonsize(dentry, iattr);
1086         }
1087
1088         return error;
1089 }
1090
1091 STATIC int
1092 xfs_vn_update_time(
1093         struct inode            *inode,
1094         struct timespec64       *now,
1095         int                     flags)
1096 {
1097         struct xfs_inode        *ip = XFS_I(inode);
1098         struct xfs_mount        *mp = ip->i_mount;
1099         int                     log_flags = XFS_ILOG_TIMESTAMP;
1100         struct xfs_trans        *tp;
1101         int                     error;
1102
1103         trace_xfs_update_time(ip);
1104
1105         if (inode->i_sb->s_flags & SB_LAZYTIME) {
1106                 if (!((flags & S_VERSION) &&
1107                       inode_maybe_inc_iversion(inode, false)))
1108                         return generic_update_time(inode, now, flags);
1109
1110                 /* Capture the iversion update that just occurred */
1111                 log_flags |= XFS_ILOG_CORE;
1112         }
1113
1114         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1115         if (error)
1116                 return error;
1117
1118         xfs_ilock(ip, XFS_ILOCK_EXCL);
1119         if (flags & S_CTIME)
1120                 inode->i_ctime = *now;
1121         if (flags & S_MTIME)
1122                 inode->i_mtime = *now;
1123         if (flags & S_ATIME)
1124                 inode->i_atime = *now;
1125
1126         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1127         xfs_trans_log_inode(tp, ip, log_flags);
1128         return xfs_trans_commit(tp);
1129 }
1130
1131 STATIC int
1132 xfs_vn_fiemap(
1133         struct inode            *inode,
1134         struct fiemap_extent_info *fieinfo,
1135         u64                     start,
1136         u64                     length)
1137 {
1138         int                     error;
1139
1140         xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1141         if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1142                 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1143                 error = iomap_fiemap(inode, fieinfo, start, length,
1144                                 &xfs_xattr_iomap_ops);
1145         } else {
1146                 error = iomap_fiemap(inode, fieinfo, start, length,
1147                                 &xfs_read_iomap_ops);
1148         }
1149         xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1150
1151         return error;
1152 }
1153
1154 STATIC int
1155 xfs_vn_tmpfile(
1156         struct inode    *dir,
1157         struct dentry   *dentry,
1158         umode_t         mode)
1159 {
1160         return xfs_generic_create(dir, dentry, mode, 0, true);
1161 }
1162
1163 static const struct inode_operations xfs_inode_operations = {
1164         .get_acl                = xfs_get_acl,
1165         .set_acl                = xfs_set_acl,
1166         .getattr                = xfs_vn_getattr,
1167         .setattr                = xfs_vn_setattr,
1168         .listxattr              = xfs_vn_listxattr,
1169         .fiemap                 = xfs_vn_fiemap,
1170         .update_time            = xfs_vn_update_time,
1171 };
1172
1173 static const struct inode_operations xfs_dir_inode_operations = {
1174         .create                 = xfs_vn_create,
1175         .lookup                 = xfs_vn_lookup,
1176         .link                   = xfs_vn_link,
1177         .unlink                 = xfs_vn_unlink,
1178         .symlink                = xfs_vn_symlink,
1179         .mkdir                  = xfs_vn_mkdir,
1180         /*
1181          * Yes, XFS uses the same method for rmdir and unlink.
1182          *
1183          * There are some subtile differences deeper in the code,
1184          * but we use S_ISDIR to check for those.
1185          */
1186         .rmdir                  = xfs_vn_unlink,
1187         .mknod                  = xfs_vn_mknod,
1188         .rename                 = xfs_vn_rename,
1189         .get_acl                = xfs_get_acl,
1190         .set_acl                = xfs_set_acl,
1191         .getattr                = xfs_vn_getattr,
1192         .setattr                = xfs_vn_setattr,
1193         .listxattr              = xfs_vn_listxattr,
1194         .update_time            = xfs_vn_update_time,
1195         .tmpfile                = xfs_vn_tmpfile,
1196 };
1197
1198 static const struct inode_operations xfs_dir_ci_inode_operations = {
1199         .create                 = xfs_vn_create,
1200         .lookup                 = xfs_vn_ci_lookup,
1201         .link                   = xfs_vn_link,
1202         .unlink                 = xfs_vn_unlink,
1203         .symlink                = xfs_vn_symlink,
1204         .mkdir                  = xfs_vn_mkdir,
1205         /*
1206          * Yes, XFS uses the same method for rmdir and unlink.
1207          *
1208          * There are some subtile differences deeper in the code,
1209          * but we use S_ISDIR to check for those.
1210          */
1211         .rmdir                  = xfs_vn_unlink,
1212         .mknod                  = xfs_vn_mknod,
1213         .rename                 = xfs_vn_rename,
1214         .get_acl                = xfs_get_acl,
1215         .set_acl                = xfs_set_acl,
1216         .getattr                = xfs_vn_getattr,
1217         .setattr                = xfs_vn_setattr,
1218         .listxattr              = xfs_vn_listxattr,
1219         .update_time            = xfs_vn_update_time,
1220         .tmpfile                = xfs_vn_tmpfile,
1221 };
1222
1223 static const struct inode_operations xfs_symlink_inode_operations = {
1224         .get_link               = xfs_vn_get_link,
1225         .getattr                = xfs_vn_getattr,
1226         .setattr                = xfs_vn_setattr,
1227         .listxattr              = xfs_vn_listxattr,
1228         .update_time            = xfs_vn_update_time,
1229 };
1230
1231 static const struct inode_operations xfs_inline_symlink_inode_operations = {
1232         .get_link               = xfs_vn_get_link_inline,
1233         .getattr                = xfs_vn_getattr,
1234         .setattr                = xfs_vn_setattr,
1235         .listxattr              = xfs_vn_listxattr,
1236         .update_time            = xfs_vn_update_time,
1237 };
1238
1239 /* Figure out if this file actually supports DAX. */
1240 static bool
1241 xfs_inode_supports_dax(
1242         struct xfs_inode        *ip)
1243 {
1244         struct xfs_mount        *mp = ip->i_mount;
1245
1246         /* Only supported on non-reflinked files. */
1247         if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
1248                 return false;
1249
1250         /* DAX mount option or DAX iflag must be set. */
1251         if (!(mp->m_flags & XFS_MOUNT_DAX) &&
1252             !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
1253                 return false;
1254
1255         /* Block size must match page size */
1256         if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1257                 return false;
1258
1259         /* Device has to support DAX too. */
1260         return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1261 }
1262
1263 STATIC void
1264 xfs_diflags_to_iflags(
1265         struct inode            *inode,
1266         struct xfs_inode        *ip)
1267 {
1268         uint16_t                flags = ip->i_d.di_flags;
1269
1270         inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
1271                             S_NOATIME | S_DAX);
1272
1273         if (flags & XFS_DIFLAG_IMMUTABLE)
1274                 inode->i_flags |= S_IMMUTABLE;
1275         if (flags & XFS_DIFLAG_APPEND)
1276                 inode->i_flags |= S_APPEND;
1277         if (flags & XFS_DIFLAG_SYNC)
1278                 inode->i_flags |= S_SYNC;
1279         if (flags & XFS_DIFLAG_NOATIME)
1280                 inode->i_flags |= S_NOATIME;
1281         if (xfs_inode_supports_dax(ip))
1282                 inode->i_flags |= S_DAX;
1283 }
1284
1285 /*
1286  * Initialize the Linux inode.
1287  *
1288  * When reading existing inodes from disk this is called directly from xfs_iget,
1289  * when creating a new inode it is called from xfs_ialloc after setting up the
1290  * inode. These callers have different criteria for clearing XFS_INEW, so leave
1291  * it up to the caller to deal with unlocking the inode appropriately.
1292  */
1293 void
1294 xfs_setup_inode(
1295         struct xfs_inode        *ip)
1296 {
1297         struct inode            *inode = &ip->i_vnode;
1298         gfp_t                   gfp_mask;
1299
1300         inode->i_ino = ip->i_ino;
1301         inode->i_state = I_NEW;
1302
1303         inode_sb_list_add(inode);
1304         /* make the inode look hashed for the writeback code */
1305         inode_fake_hash(inode);
1306
1307         i_size_write(inode, ip->i_d.di_size);
1308         xfs_diflags_to_iflags(inode, ip);
1309
1310         if (S_ISDIR(inode->i_mode)) {
1311                 /*
1312                  * We set the i_rwsem class here to avoid potential races with
1313                  * lockdep_annotate_inode_mutex_key() reinitialising the lock
1314                  * after a filehandle lookup has already found the inode in
1315                  * cache before it has been unlocked via unlock_new_inode().
1316                  */
1317                 lockdep_set_class(&inode->i_rwsem,
1318                                   &inode->i_sb->s_type->i_mutex_dir_key);
1319                 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1320         } else {
1321                 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1322         }
1323
1324         /*
1325          * Ensure all page cache allocations are done from GFP_NOFS context to
1326          * prevent direct reclaim recursion back into the filesystem and blowing
1327          * stacks or deadlocking.
1328          */
1329         gfp_mask = mapping_gfp_mask(inode->i_mapping);
1330         mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1331
1332         /*
1333          * If there is no attribute fork no ACL can exist on this inode,
1334          * and it can't have any file capabilities attached to it either.
1335          */
1336         if (!XFS_IFORK_Q(ip)) {
1337                 inode_has_no_xattr(inode);
1338                 cache_no_acl(inode);
1339         }
1340 }
1341
1342 void
1343 xfs_setup_iops(
1344         struct xfs_inode        *ip)
1345 {
1346         struct inode            *inode = &ip->i_vnode;
1347
1348         switch (inode->i_mode & S_IFMT) {
1349         case S_IFREG:
1350                 inode->i_op = &xfs_inode_operations;
1351                 inode->i_fop = &xfs_file_operations;
1352                 if (IS_DAX(inode))
1353                         inode->i_mapping->a_ops = &xfs_dax_aops;
1354                 else
1355                         inode->i_mapping->a_ops = &xfs_address_space_operations;
1356                 break;
1357         case S_IFDIR:
1358                 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1359                         inode->i_op = &xfs_dir_ci_inode_operations;
1360                 else
1361                         inode->i_op = &xfs_dir_inode_operations;
1362                 inode->i_fop = &xfs_dir_file_operations;
1363                 break;
1364         case S_IFLNK:
1365                 if (ip->i_df.if_flags & XFS_IFINLINE)
1366                         inode->i_op = &xfs_inline_symlink_inode_operations;
1367                 else
1368                         inode->i_op = &xfs_symlink_inode_operations;
1369                 break;
1370         default:
1371                 inode->i_op = &xfs_inode_operations;
1372                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1373                 break;
1374         }
1375 }