fs/xfs/xfs_iops.c

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

DEFINITIONS
