fs/xfs/linux-2.6/xfs_iops.c

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_bit.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_dir2.h"
  27 #include "xfs_alloc.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_quota.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_ialloc_btree.h"
  34 #include "xfs_dir2_sf.h"
  35 #include "xfs_attr_sf.h"
  36 #include "xfs_dinode.h"
  37 #include "xfs_inode.h"
  38 #include "xfs_bmap.h"
  39 #include "xfs_btree.h"
  40 #include "xfs_ialloc.h"
  41 #include "xfs_rtalloc.h"
  42 #include "xfs_error.h"
  43 #include "xfs_itable.h"
  44 #include "xfs_rw.h"
  45 #include "xfs_acl.h"
  46 #include "xfs_attr.h"
  47 #include "xfs_buf_item.h"
  48 #include "xfs_utils.h"
  49 #include "xfs_vnodeops.h"
  50
  51 #include <linux/capability.h>
  52 #include <linux/xattr.h>
  53 #include <linux/namei.h>
  54 #include <linux/security.h>
  55
  56 /*
  57  * Bring the atime in the XFS inode uptodate.
  58  * Used before logging the inode to disk or when the Linux inode goes away.
  59  */
  60 void
  61 xfs_synchronize_atime(
  62         xfs_inode_t     *ip)
  63 {
  64         bhv_vnode_t     *vp;
  65
  66         vp = XFS_ITOV_NULL(ip);
  67         if (vp) {
  68                 struct inode *inode = &vp->v_inode;
  69                 ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
  70                 ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
  71         }
  72 }
  73
  74 /*
  75  * Change the requested timestamp in the given inode.
  76  * We don't lock across timestamp updates, and we don't log them but
  77  * we do record the fact that there is dirty information in core.
  78  *
  79  * NOTE -- callers MUST combine XFS_ICHGTIME_MOD or XFS_ICHGTIME_CHG
  80  *              with XFS_ICHGTIME_ACC to be sure that access time
  81  *              update will take.  Calling first with XFS_ICHGTIME_ACC
  82  *              and then XFS_ICHGTIME_MOD may fail to modify the access
  83  *              timestamp if the filesystem is mounted noacctm.
  84  */
  85 void
  86 xfs_ichgtime(
  87         xfs_inode_t     *ip,
  88         int             flags)
  89 {
  90         struct inode    *inode = vn_to_inode(XFS_ITOV(ip));
  91         timespec_t      tv;
  92
  93         nanotime(&tv);
  94         if (flags & XFS_ICHGTIME_MOD) {
  95                 inode->i_mtime = tv;
  96                 ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
  97                 ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
  98         }
  99         if (flags & XFS_ICHGTIME_ACC) {
 100                 inode->i_atime = tv;
 101                 ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec;
 102                 ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec;
 103         }
 104         if (flags & XFS_ICHGTIME_CHG) {
 105                 inode->i_ctime = tv;
 106                 ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec;
 107                 ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec;
 108         }
 109
 110         /*
 111          * We update the i_update_core field _after_ changing
 112          * the timestamps in order to coordinate properly with
 113          * xfs_iflush() so that we don't lose timestamp updates.
 114          * This keeps us from having to hold the inode lock
 115          * while doing this.  We use the SYNCHRONIZE macro to
 116          * ensure that the compiler does not reorder the update
 117          * of i_update_core above the timestamp updates above.
 118          */
 119         SYNCHRONIZE();
 120         ip->i_update_core = 1;
 121         if (!(inode->i_state & I_LOCK))
 122                 mark_inode_dirty_sync(inode);
 123 }
 124
 125 /*
 126  * Variant on the above which avoids querying the system clock
 127  * in situations where we know the Linux inode timestamps have
 128  * just been updated (and so we can update our inode cheaply).
 129  */
 130 void
 131 xfs_ichgtime_fast(
 132         xfs_inode_t     *ip,
 133         struct inode    *inode,
 134         int             flags)
 135 {
 136         timespec_t      *tvp;
 137
 138         /*
 139          * Atime updates for read() & friends are handled lazily now, and
 140          * explicit updates must go through xfs_ichgtime()
 141          */
 142         ASSERT((flags & XFS_ICHGTIME_ACC) == 0);
 143
 144         /*
 145          * We're not supposed to change timestamps in readonly-mounted
 146          * filesystems.  Throw it away if anyone asks us.
 147          */
 148         if (unlikely(IS_RDONLY(inode)))
 149                 return;
 150
 151         if (flags & XFS_ICHGTIME_MOD) {
 152                 tvp = &inode->i_mtime;
 153                 ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec;
 154                 ip->i_d.di_mtime.t_nsec = (__int32_t)tvp->tv_nsec;
 155         }
 156         if (flags & XFS_ICHGTIME_CHG) {
 157                 tvp = &inode->i_ctime;
 158                 ip->i_d.di_ctime.t_sec = (__int32_t)tvp->tv_sec;
 159                 ip->i_d.di_ctime.t_nsec = (__int32_t)tvp->tv_nsec;
 160         }
 161
 162         /*
 163          * We update the i_update_core field _after_ changing
 164          * the timestamps in order to coordinate properly with
 165          * xfs_iflush() so that we don't lose timestamp updates.
 166          * This keeps us from having to hold the inode lock
 167          * while doing this.  We use the SYNCHRONIZE macro to
 168          * ensure that the compiler does not reorder the update
 169          * of i_update_core above the timestamp updates above.
 170          */
 171         SYNCHRONIZE();
 172         ip->i_update_core = 1;
 173         if (!(inode->i_state & I_LOCK))
 174                 mark_inode_dirty_sync(inode);
 175 }
 176
 177
 178 /*
 179  * Pull the link count and size up from the xfs inode to the linux inode
 180  */
 181 STATIC void
 182 xfs_validate_fields(
 183         struct inode    *ip,
 184         bhv_vattr_t     *vattr)
 185 {
 186         vattr->va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
 187         if (!xfs_getattr(XFS_I(ip), vattr, ATTR_LAZY)) {
 188                 ip->i_nlink = vattr->va_nlink;
 189                 ip->i_blocks = vattr->va_nblocks;
 190
 191                 /* we're under i_sem so i_size can't change under us */
 192                 if (i_size_read(ip) != vattr->va_size)
 193                         i_size_write(ip, vattr->va_size);
 194         }
 195 }
 196
 197 /*
 198  * Hook in SELinux.  This is not quite correct yet, what we really need
 199  * here (as we do for default ACLs) is a mechanism by which creation of
 200  * these attrs can be journalled at inode creation time (along with the
 201  * inode, of course, such that log replay can't cause these to be lost).
 202  */
 203 STATIC int
 204 xfs_init_security(
 205         bhv_vnode_t     *vp,
 206         struct inode    *dir)
 207 {
 208         struct inode    *ip = vn_to_inode(vp);
 209         size_t          length;
 210         void            *value;
 211         char            *name;
 212         int             error;
 213
 214         error = security_inode_init_security(ip, dir, &name, &value, &length);
 215         if (error) {
 216                 if (error == -EOPNOTSUPP)
 217                         return 0;
 218                 return -error;
 219         }
 220
 221         error = xfs_attr_set(XFS_I(ip), name, value,
 222                         length, ATTR_SECURE);
 223         if (!error)
 224                 xfs_iflags_set(XFS_I(ip), XFS_IMODIFIED);
 225
 226         kfree(name);
 227         kfree(value);
 228         return error;
 229 }
 230
 231 /*
 232  * Determine whether a process has a valid fs_struct (kernel daemons
 233  * like knfsd don't have an fs_struct).
 234  *
 235  * XXX(hch):  nfsd is broken, better fix it instead.
 236  */
 237 STATIC_INLINE int
 238 xfs_has_fs_struct(struct task_struct *task)
 239 {
 240         return (task->fs != init_task.fs);
 241 }
 242
 243 STATIC void
 244 xfs_cleanup_inode(
 245         struct inode    *dir,
 246         bhv_vnode_t     *vp,
 247         struct dentry   *dentry,
 248         int             mode)
 249 {
 250         struct dentry   teardown = {};
 251
 252         /* Oh, the horror.
 253          * If we can't add the ACL or we fail in
 254          * xfs_init_security we must back out.
 255          * ENOSPC can hit here, among other things.
 256          */
 257         teardown.d_inode = vn_to_inode(vp);
 258         teardown.d_name = dentry->d_name;
 259
 260         if (S_ISDIR(mode))
 261                 xfs_rmdir(XFS_I(dir), &teardown);
 262         else
 263                 xfs_remove(XFS_I(dir), &teardown);
 264         VN_RELE(vp);
 265 }
 266
 267 STATIC int
 268 xfs_vn_mknod(
 269         struct inode    *dir,
 270         struct dentry   *dentry,
 271         int             mode,
 272         dev_t           rdev)
 273 {
 274         struct inode    *ip;
 275         bhv_vattr_t     vattr = { 0 };
 276         bhv_vnode_t     *vp = NULL, *dvp = vn_from_inode(dir);
 277         xfs_acl_t       *default_acl = NULL;
 278         attrexists_t    test_default_acl = _ACL_DEFAULT_EXISTS;
 279         int             error;
 280
 281         /*
 282          * Irix uses Missed'em'V split, but doesn't want to see
 283          * the upper 5 bits of (14bit) major.
 284          */
 285         if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
 286                 return -EINVAL;
 287
 288         if (unlikely(test_default_acl && test_default_acl(dvp))) {
 289                 if (!_ACL_ALLOC(default_acl)) {
 290                         return -ENOMEM;
 291                 }
 292                 if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
 293                         _ACL_FREE(default_acl);
 294                         default_acl = NULL;
 295                 }
 296         }
 297
 298         if (IS_POSIXACL(dir) && !default_acl && xfs_has_fs_struct(current))
 299                 mode &= ~current->fs->umask;
 300
 301         vattr.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 302         vattr.va_mode = mode;
 303
 304         switch (mode & S_IFMT) {
 305         case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
 306                 vattr.va_rdev = sysv_encode_dev(rdev);
 307                 vattr.va_mask |= XFS_AT_RDEV;
 308                 /*FALLTHROUGH*/
 309         case S_IFREG:
 310                 error = xfs_create(XFS_I(dir), dentry, &vattr, &vp, NULL);
 311                 break;
 312         case S_IFDIR:
 313                 error = xfs_mkdir(XFS_I(dir), dentry, &vattr, &vp, NULL);
 314                 break;
 315         default:
 316                 error = EINVAL;
 317                 break;
 318         }
 319
 320         if (unlikely(!error)) {
 321                 error = xfs_init_security(vp, dir);
 322                 if (error)
 323                         xfs_cleanup_inode(dir, vp, dentry, mode);
 324         }
 325
 326         if (unlikely(default_acl)) {
 327                 if (!error) {
 328                         error = _ACL_INHERIT(vp, &vattr, default_acl);
 329                         if (!error)
 330                                 xfs_iflags_set(XFS_I(&vp->v_inode), XFS_IMODIFIED);
 331                         else
 332                                 xfs_cleanup_inode(dir, vp, dentry, mode);
 333                 }
 334                 _ACL_FREE(default_acl);
 335         }
 336
 337         if (likely(!error)) {
 338                 ASSERT(vp);
 339                 ip = vn_to_inode(vp);
 340
 341                 if (S_ISCHR(mode) || S_ISBLK(mode))
 342                         ip->i_rdev = rdev;
 343                 else if (S_ISDIR(mode))
 344                         xfs_validate_fields(ip, &vattr);
 345                 d_instantiate(dentry, ip);
 346                 xfs_validate_fields(dir, &vattr);
 347         }
 348         return -error;
 349 }
 350
 351 STATIC int
 352 xfs_vn_create(
 353         struct inode    *dir,
 354         struct dentry   *dentry,
 355         int             mode,
 356         struct nameidata *nd)
 357 {
 358         return xfs_vn_mknod(dir, dentry, mode, 0);
 359 }
 360
 361 STATIC int
 362 xfs_vn_mkdir(
 363         struct inode    *dir,
 364         struct dentry   *dentry,
 365         int             mode)
 366 {
 367         return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
 368 }
 369
 370 STATIC struct dentry *
 371 xfs_vn_lookup(
 372         struct inode    *dir,
 373         struct dentry   *dentry,
 374         struct nameidata *nd)
 375 {
 376         bhv_vnode_t     *cvp;
 377         int             error;
 378
 379         if (dentry->d_name.len >= MAXNAMELEN)
 380                 return ERR_PTR(-ENAMETOOLONG);
 381
 382         error = xfs_lookup(XFS_I(dir), dentry, &cvp);
 383         if (unlikely(error)) {
 384                 if (unlikely(error != ENOENT))
 385                         return ERR_PTR(-error);
 386                 d_add(dentry, NULL);
 387                 return NULL;
 388         }
 389
 390         return d_splice_alias(vn_to_inode(cvp), dentry);
 391 }
 392
 393 STATIC int
 394 xfs_vn_link(
 395         struct dentry   *old_dentry,
 396         struct inode    *dir,
 397         struct dentry   *dentry)
 398 {
 399         struct inode    *ip;    /* inode of guy being linked to */
 400         bhv_vnode_t     *vp;    /* vp of name being linked */
 401         bhv_vattr_t     vattr;
 402         int             error;
 403
 404         ip = old_dentry->d_inode;       /* inode being linked to */
 405         vp = vn_from_inode(ip);
 406
 407         VN_HOLD(vp);
 408         error = xfs_link(XFS_I(dir), vp, dentry);
 409         if (unlikely(error)) {
 410                 VN_RELE(vp);
 411         } else {
 412                 xfs_iflags_set(XFS_I(dir), XFS_IMODIFIED);
 413                 xfs_validate_fields(ip, &vattr);
 414                 d_instantiate(dentry, ip);
 415         }
 416         return -error;
 417 }
 418
 419 STATIC int
 420 xfs_vn_unlink(
 421         struct inode    *dir,
 422         struct dentry   *dentry)
 423 {
 424         struct inode    *inode;
 425         bhv_vattr_t     vattr;
 426         int             error;
 427
 428         inode = dentry->d_inode;
 429
 430         error = xfs_remove(XFS_I(dir), dentry);
 431         if (likely(!error)) {
 432                 xfs_validate_fields(dir, &vattr);       /* size needs update */
 433                 xfs_validate_fields(inode, &vattr);
 434         }
 435         return -error;
 436 }
 437
 438 STATIC int
 439 xfs_vn_symlink(
 440         struct inode    *dir,
 441         struct dentry   *dentry,
 442         const char      *symname)
 443 {
 444         struct inode    *ip;
 445         bhv_vattr_t     va = { 0 };
 446         bhv_vnode_t     *cvp;   /* used to lookup symlink to put in dentry */
 447         int             error;
 448
 449         cvp = NULL;
 450
 451         va.va_mode = S_IFLNK |
 452                 (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
 453         va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 454
 455         error = xfs_symlink(XFS_I(dir), dentry, &va,
 456                         (char *)symname, &cvp, NULL);
 457         if (likely(!error && cvp)) {
 458                 error = xfs_init_security(cvp, dir);
 459                 if (likely(!error)) {
 460                         ip = vn_to_inode(cvp);
 461                         d_instantiate(dentry, ip);
 462                         xfs_validate_fields(dir, &va);
 463                         xfs_validate_fields(ip, &va);
 464                 } else {
 465                         xfs_cleanup_inode(dir, cvp, dentry, 0);
 466                 }
 467         }
 468         return -error;
 469 }
 470
 471 STATIC int
 472 xfs_vn_rmdir(
 473         struct inode    *dir,
 474         struct dentry   *dentry)
 475 {
 476         struct inode    *inode = dentry->d_inode;
 477         bhv_vattr_t     vattr;
 478         int             error;
 479
 480         error = xfs_rmdir(XFS_I(dir), dentry);
 481         if (likely(!error)) {
 482                 xfs_validate_fields(inode, &vattr);
 483                 xfs_validate_fields(dir, &vattr);
 484         }
 485         return -error;
 486 }
 487
 488 STATIC int
 489 xfs_vn_rename(
 490         struct inode    *odir,
 491         struct dentry   *odentry,
 492         struct inode    *ndir,
 493         struct dentry   *ndentry)
 494 {
 495         struct inode    *new_inode = ndentry->d_inode;
 496         bhv_vnode_t     *tvp;   /* target directory */
 497         bhv_vattr_t     vattr;
 498         int             error;
 499
 500         tvp = vn_from_inode(ndir);
 501
 502         error = xfs_rename(XFS_I(odir), odentry, tvp, ndentry);
 503         if (likely(!error)) {
 504                 if (new_inode)
 505                         xfs_validate_fields(new_inode, &vattr);
 506                 xfs_validate_fields(odir, &vattr);
 507                 if (ndir != odir)
 508                         xfs_validate_fields(ndir, &vattr);
 509         }
 510         return -error;
 511 }
 512
 513 /*
 514  * careful here - this function can get called recursively, so
 515  * we need to be very careful about how much stack we use.
 516  * uio is kmalloced for this reason...
 517  */
 518 STATIC void *
 519 xfs_vn_follow_link(
 520         struct dentry           *dentry,
 521         struct nameidata        *nd)
 522 {
 523         char                    *link;
 524         int                     error = -ENOMEM;
 525
 526         link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
 527         if (!link)
 528                 goto out_err;
 529
 530         error = -xfs_readlink(XFS_I(dentry->d_inode), link);
 531         if (unlikely(error))
 532                 goto out_kfree;
 533
 534         nd_set_link(nd, link);
 535         return NULL;
 536
 537  out_kfree:
 538         kfree(link);
 539  out_err:
 540         nd_set_link(nd, ERR_PTR(error));
 541         return NULL;
 542 }
 543
 544 STATIC void
 545 xfs_vn_put_link(
 546         struct dentry   *dentry,
 547         struct nameidata *nd,
 548         void            *p)
 549 {
 550         char            *s = nd_get_link(nd);
 551
 552         if (!IS_ERR(s))
 553                 kfree(s);
 554 }
 555
 556 #ifdef CONFIG_XFS_POSIX_ACL
 557 STATIC int
 558 xfs_vn_permission(
 559         struct inode    *inode,
 560         int             mode,
 561         struct nameidata *nd)
 562 {
 563         return -xfs_access(XFS_I(inode), mode << 6, NULL);
 564 }
 565 #else
 566 #define xfs_vn_permission NULL
 567 #endif
 568
 569 STATIC int
 570 xfs_vn_getattr(
 571         struct vfsmount *mnt,
 572         struct dentry   *dentry,
 573         struct kstat    *stat)
 574 {
 575         struct inode    *inode = dentry->d_inode;
 576         bhv_vattr_t     vattr = { .va_mask = XFS_AT_STAT };
 577         int             error;
 578
 579         error = xfs_getattr(XFS_I(inode), &vattr, ATTR_LAZY);
 580         if (likely(!error)) {
 581                 stat->size = i_size_read(inode);
 582                 stat->dev = inode->i_sb->s_dev;
 583                 stat->rdev = (vattr.va_rdev == 0) ? 0 :
 584                                 MKDEV(sysv_major(vattr.va_rdev) & 0x1ff,
 585                                       sysv_minor(vattr.va_rdev));
 586                 stat->mode = vattr.va_mode;
 587                 stat->nlink = vattr.va_nlink;
 588                 stat->uid = vattr.va_uid;
 589                 stat->gid = vattr.va_gid;
 590                 stat->ino = vattr.va_nodeid;
 591                 stat->atime = vattr.va_atime;
 592                 stat->mtime = vattr.va_mtime;
 593                 stat->ctime = vattr.va_ctime;
 594                 stat->blocks = vattr.va_nblocks;
 595                 stat->blksize = vattr.va_blocksize;
 596         }
 597         return -error;
 598 }
 599
 600 STATIC int
 601 xfs_vn_setattr(
 602         struct dentry   *dentry,
 603         struct iattr    *attr)
 604 {
 605         struct inode    *inode = dentry->d_inode;
 606         unsigned int    ia_valid = attr->ia_valid;
 607         bhv_vattr_t     vattr = { 0 };
 608         int             flags = 0;
 609         int             error;
 610
 611         if (ia_valid & ATTR_UID) {
 612                 vattr.va_mask |= XFS_AT_UID;
 613                 vattr.va_uid = attr->ia_uid;
 614         }
 615         if (ia_valid & ATTR_GID) {
 616                 vattr.va_mask |= XFS_AT_GID;
 617                 vattr.va_gid = attr->ia_gid;
 618         }
 619         if (ia_valid & ATTR_SIZE) {
 620                 vattr.va_mask |= XFS_AT_SIZE;
 621                 vattr.va_size = attr->ia_size;
 622         }
 623         if (ia_valid & ATTR_ATIME) {
 624                 vattr.va_mask |= XFS_AT_ATIME;
 625                 vattr.va_atime = attr->ia_atime;
 626                 inode->i_atime = attr->ia_atime;
 627         }
 628         if (ia_valid & ATTR_MTIME) {
 629                 vattr.va_mask |= XFS_AT_MTIME;
 630                 vattr.va_mtime = attr->ia_mtime;
 631         }
 632         if (ia_valid & ATTR_CTIME) {
 633                 vattr.va_mask |= XFS_AT_CTIME;
 634                 vattr.va_ctime = attr->ia_ctime;
 635         }
 636         if (ia_valid & ATTR_MODE) {
 637                 vattr.va_mask |= XFS_AT_MODE;
 638                 vattr.va_mode = attr->ia_mode;
 639                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 640                         inode->i_mode &= ~S_ISGID;
 641         }
 642
 643         if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
 644                 flags |= ATTR_UTIME;
 645 #ifdef ATTR_NO_BLOCK
 646         if ((ia_valid & ATTR_NO_BLOCK))
 647                 flags |= ATTR_NONBLOCK;
 648 #endif
 649
 650         error = xfs_setattr(XFS_I(inode), &vattr, flags, NULL);
 651         if (likely(!error))
 652                 __vn_revalidate(vn_from_inode(inode), &vattr);
 653         return -error;
 654 }
 655
 656 STATIC void
 657 xfs_vn_truncate(
 658         struct inode    *inode)
 659 {
 660         block_truncate_page(inode->i_mapping, inode->i_size, xfs_get_blocks);
 661 }
 662
 663 STATIC int
 664 xfs_vn_setxattr(
 665         struct dentry   *dentry,
 666         const char      *name,
 667         const void      *data,
 668         size_t          size,
 669         int             flags)
 670 {
 671         bhv_vnode_t     *vp = vn_from_inode(dentry->d_inode);
 672         char            *attr = (char *)name;
 673         attrnames_t     *namesp;
 674         int             xflags = 0;
 675         int             error;
 676
 677         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 678         if (!namesp)
 679                 return -EOPNOTSUPP;
 680         attr += namesp->attr_namelen;
 681         error = namesp->attr_capable(vp, NULL);
 682         if (error)
 683                 return error;
 684
 685         /* Convert Linux syscall to XFS internal ATTR flags */
 686         if (flags & XATTR_CREATE)
 687                 xflags |= ATTR_CREATE;
 688         if (flags & XATTR_REPLACE)
 689                 xflags |= ATTR_REPLACE;
 690         xflags |= namesp->attr_flag;
 691         return namesp->attr_set(vp, attr, (void *)data, size, xflags);
 692 }
 693
 694 STATIC ssize_t
 695 xfs_vn_getxattr(
 696         struct dentry   *dentry,
 697         const char      *name,
 698         void            *data,
 699         size_t          size)
 700 {
 701         bhv_vnode_t     *vp = vn_from_inode(dentry->d_inode);
 702         char            *attr = (char *)name;
 703         attrnames_t     *namesp;
 704         int             xflags = 0;
 705         ssize_t         error;
 706
 707         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 708         if (!namesp)
 709                 return -EOPNOTSUPP;
 710         attr += namesp->attr_namelen;
 711         error = namesp->attr_capable(vp, NULL);
 712         if (error)
 713                 return error;
 714
 715         /* Convert Linux syscall to XFS internal ATTR flags */
 716         if (!size) {
 717                 xflags |= ATTR_KERNOVAL;
 718                 data = NULL;
 719         }
 720         xflags |= namesp->attr_flag;
 721         return namesp->attr_get(vp, attr, (void *)data, size, xflags);
 722 }
 723
 724 STATIC ssize_t
 725 xfs_vn_listxattr(
 726         struct dentry           *dentry,
 727         char                    *data,
 728         size_t                  size)
 729 {
 730         bhv_vnode_t             *vp = vn_from_inode(dentry->d_inode);
 731         int                     error, xflags = ATTR_KERNAMELS;
 732         ssize_t                 result;
 733
 734         if (!size)
 735                 xflags |= ATTR_KERNOVAL;
 736         xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;
 737
 738         error = attr_generic_list(vp, data, size, xflags, &result);
 739         if (error < 0)
 740                 return error;
 741         return result;
 742 }
 743
 744 STATIC int
 745 xfs_vn_removexattr(
 746         struct dentry   *dentry,
 747         const char      *name)
 748 {
 749         bhv_vnode_t     *vp = vn_from_inode(dentry->d_inode);
 750         char            *attr = (char *)name;
 751         attrnames_t     *namesp;
 752         int             xflags = 0;
 753         int             error;
 754
 755         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 756         if (!namesp)
 757                 return -EOPNOTSUPP;
 758         attr += namesp->attr_namelen;
 759         error = namesp->attr_capable(vp, NULL);
 760         if (error)
 761                 return error;
 762         xflags |= namesp->attr_flag;
 763         return namesp->attr_remove(vp, attr, xflags);
 764 }
 765
 766
 767 const struct inode_operations xfs_inode_operations = {
 768         .permission             = xfs_vn_permission,
 769         .truncate               = xfs_vn_truncate,
 770         .getattr                = xfs_vn_getattr,
 771         .setattr                = xfs_vn_setattr,
 772         .setxattr               = xfs_vn_setxattr,
 773         .getxattr               = xfs_vn_getxattr,
 774         .listxattr              = xfs_vn_listxattr,
 775         .removexattr            = xfs_vn_removexattr,
 776 };
 777
 778 const struct inode_operations xfs_dir_inode_operations = {
 779         .create                 = xfs_vn_create,
 780         .lookup                 = xfs_vn_lookup,
 781         .link                   = xfs_vn_link,
 782         .unlink                 = xfs_vn_unlink,
 783         .symlink                = xfs_vn_symlink,
 784         .mkdir                  = xfs_vn_mkdir,
 785         .rmdir                  = xfs_vn_rmdir,
 786         .mknod                  = xfs_vn_mknod,
 787         .rename                 = xfs_vn_rename,
 788         .permission             = xfs_vn_permission,
 789         .getattr                = xfs_vn_getattr,
 790         .setattr                = xfs_vn_setattr,
 791         .setxattr               = xfs_vn_setxattr,
 792         .getxattr               = xfs_vn_getxattr,
 793         .listxattr              = xfs_vn_listxattr,
 794         .removexattr            = xfs_vn_removexattr,
 795 };
 796
 797 const struct inode_operations xfs_symlink_inode_operations = {
 798         .readlink               = generic_readlink,
 799         .follow_link            = xfs_vn_follow_link,
 800         .put_link               = xfs_vn_put_link,
 801         .permission             = xfs_vn_permission,
 802         .getattr                = xfs_vn_getattr,
 803         .setattr                = xfs_vn_setattr,
 804         .setxattr               = xfs_vn_setxattr,
 805         .getxattr               = xfs_vn_getxattr,
 806         .listxattr              = xfs_vn_listxattr,
 807         .removexattr            = xfs_vn_removexattr,
 808 };