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_dir.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_alloc.h"
  29 #include "xfs_dmapi.h"
  30 #include "xfs_quota.h"
  31 #include "xfs_mount.h"
  32 #include "xfs_bmap_btree.h"
  33 #include "xfs_alloc_btree.h"
  34 #include "xfs_ialloc_btree.h"
  35 #include "xfs_dir_sf.h"
  36 #include "xfs_dir2_sf.h"
  37 #include "xfs_attr_sf.h"
  38 #include "xfs_dinode.h"
  39 #include "xfs_inode.h"
  40 #include "xfs_bmap.h"
  41 #include "xfs_btree.h"
  42 #include "xfs_ialloc.h"
  43 #include "xfs_rtalloc.h"
  44 #include "xfs_error.h"
  45 #include "xfs_itable.h"
  46 #include "xfs_rw.h"
  47 #include "xfs_acl.h"
  48 #include "xfs_cap.h"
  49 #include "xfs_mac.h"
  50 #include "xfs_attr.h"
  51 #include "xfs_buf_item.h"
  52 #include "xfs_utils.h"
  53
  54 #include <linux/xattr.h>
  55 #include <linux/namei.h>
  56
  57 /*
  58  * Change the requested timestamp in the given inode.
  59  * We don't lock across timestamp updates, and we don't log them but
  60  * we do record the fact that there is dirty information in core.
  61  *
  62  * NOTE -- callers MUST combine XFS_ICHGTIME_MOD or XFS_ICHGTIME_CHG
  63  *              with XFS_ICHGTIME_ACC to be sure that access time
  64  *              update will take.  Calling first with XFS_ICHGTIME_ACC
  65  *              and then XFS_ICHGTIME_MOD may fail to modify the access
  66  *              timestamp if the filesystem is mounted noacctm.
  67  */
  68 void
  69 xfs_ichgtime(
  70         xfs_inode_t     *ip,
  71         int             flags)
  72 {
  73         struct inode    *inode = LINVFS_GET_IP(XFS_ITOV(ip));
  74         timespec_t      tv;
  75
  76         /*
  77          * We're not supposed to change timestamps in readonly-mounted
  78          * filesystems.  Throw it away if anyone asks us.
  79          */
  80         if (unlikely(IS_RDONLY(inode)))
  81                 return;
  82
  83         /*
  84          * Don't update access timestamps on reads if mounted "noatime".
  85          * Throw it away if anyone asks us.
  86          */
  87         if (unlikely(
  88             (ip->i_mount->m_flags & XFS_MOUNT_NOATIME || IS_NOATIME(inode)) &&
  89             (flags & (XFS_ICHGTIME_ACC|XFS_ICHGTIME_MOD|XFS_ICHGTIME_CHG)) ==
  90                         XFS_ICHGTIME_ACC))
  91                 return;
  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  * We also skip the readonly and noatime checks here, they are
 130  * also catered for already.
 131  */
 132 void
 133 xfs_ichgtime_fast(
 134         xfs_inode_t     *ip,
 135         struct inode    *inode,
 136         int             flags)
 137 {
 138         timespec_t      *tvp;
 139
 140         /*
 141          * We're not supposed to change timestamps in readonly-mounted
 142          * filesystems.  Throw it away if anyone asks us.
 143          */
 144         if (unlikely(IS_RDONLY(inode)))
 145                 return;
 146
 147         /*
 148          * Don't update access timestamps on reads if mounted "noatime".
 149          * Throw it away if anyone asks us.
 150          */
 151         if (unlikely(
 152             (ip->i_mount->m_flags & XFS_MOUNT_NOATIME || IS_NOATIME(inode)) &&
 153             ((flags & (XFS_ICHGTIME_ACC|XFS_ICHGTIME_MOD|XFS_ICHGTIME_CHG)) ==
 154                         XFS_ICHGTIME_ACC)))
 155                 return;
 156
 157         if (flags & XFS_ICHGTIME_MOD) {
 158                 tvp = &inode->i_mtime;
 159                 ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec;
 160                 ip->i_d.di_mtime.t_nsec = (__int32_t)tvp->tv_nsec;
 161         }
 162         if (flags & XFS_ICHGTIME_ACC) {
 163                 tvp = &inode->i_atime;
 164                 ip->i_d.di_atime.t_sec = (__int32_t)tvp->tv_sec;
 165                 ip->i_d.di_atime.t_nsec = (__int32_t)tvp->tv_nsec;
 166         }
 167         if (flags & XFS_ICHGTIME_CHG) {
 168                 tvp = &inode->i_ctime;
 169                 ip->i_d.di_ctime.t_sec = (__int32_t)tvp->tv_sec;
 170                 ip->i_d.di_ctime.t_nsec = (__int32_t)tvp->tv_nsec;
 171         }
 172
 173         /*
 174          * We update the i_update_core field _after_ changing
 175          * the timestamps in order to coordinate properly with
 176          * xfs_iflush() so that we don't lose timestamp updates.
 177          * This keeps us from having to hold the inode lock
 178          * while doing this.  We use the SYNCHRONIZE macro to
 179          * ensure that the compiler does not reorder the update
 180          * of i_update_core above the timestamp updates above.
 181          */
 182         SYNCHRONIZE();
 183         ip->i_update_core = 1;
 184         if (!(inode->i_state & I_LOCK))
 185                 mark_inode_dirty_sync(inode);
 186 }
 187
 188
 189 /*
 190  * Pull the link count and size up from the xfs inode to the linux inode
 191  */
 192 STATIC void
 193 validate_fields(
 194         struct inode    *ip)
 195 {
 196         vnode_t         *vp = LINVFS_GET_VP(ip);
 197         vattr_t         va;
 198         int             error;
 199
 200         va.va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
 201         VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error);
 202         if (likely(!error)) {
 203                 ip->i_nlink = va.va_nlink;
 204                 ip->i_blocks = va.va_nblocks;
 205
 206                 /* we're under i_mutex so i_size can't change under us */
 207                 if (i_size_read(ip) != va.va_size)
 208                         i_size_write(ip, va.va_size);
 209         }
 210 }
 211
 212 /*
 213  * Determine whether a process has a valid fs_struct (kernel daemons
 214  * like knfsd don't have an fs_struct).
 215  *
 216  * XXX(hch):  nfsd is broken, better fix it instead.
 217  */
 218 STATIC inline int
 219 has_fs_struct(struct task_struct *task)
 220 {
 221         return (task->fs != init_task.fs);
 222 }
 223
 224 STATIC int
 225 linvfs_mknod(
 226         struct inode    *dir,
 227         struct dentry   *dentry,
 228         int             mode,
 229         dev_t           rdev)
 230 {
 231         struct inode    *ip;
 232         vattr_t         va;
 233         vnode_t         *vp = NULL, *dvp = LINVFS_GET_VP(dir);
 234         xfs_acl_t       *default_acl = NULL;
 235         attrexists_t    test_default_acl = _ACL_DEFAULT_EXISTS;
 236         int             error;
 237
 238         /*
 239          * Irix uses Missed'em'V split, but doesn't want to see
 240          * the upper 5 bits of (14bit) major.
 241          */
 242         if (!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)
 243                 return -EINVAL;
 244
 245         if (test_default_acl && test_default_acl(dvp)) {
 246                 if (!_ACL_ALLOC(default_acl))
 247                         return -ENOMEM;
 248                 if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
 249                         _ACL_FREE(default_acl);
 250                         default_acl = NULL;
 251                 }
 252         }
 253
 254         if (IS_POSIXACL(dir) && !default_acl && has_fs_struct(current))
 255                 mode &= ~current->fs->umask;
 256
 257         memset(&va, 0, sizeof(va));
 258         va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 259         va.va_mode = mode;
 260
 261         switch (mode & S_IFMT) {
 262         case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
 263                 va.va_rdev = sysv_encode_dev(rdev);
 264                 va.va_mask |= XFS_AT_RDEV;
 265                 /*FALLTHROUGH*/
 266         case S_IFREG:
 267                 VOP_CREATE(dvp, dentry, &va, &vp, NULL, error);
 268                 break;
 269         case S_IFDIR:
 270                 VOP_MKDIR(dvp, dentry, &va, &vp, NULL, error);
 271                 break;
 272         default:
 273                 error = EINVAL;
 274                 break;
 275         }
 276
 277         if (default_acl) {
 278                 if (!error) {
 279                         error = _ACL_INHERIT(vp, &va, default_acl);
 280                         if (!error) {
 281                                 VMODIFY(vp);
 282                         } else {
 283                                 struct dentry   teardown = {};
 284                                 int             err2;
 285
 286                                 /* Oh, the horror.
 287                                  * If we can't add the ACL we must back out.
 288                                  * ENOSPC can hit here, among other things.
 289                                  */
 290                                 teardown.d_inode = ip = LINVFS_GET_IP(vp);
 291                                 teardown.d_name = dentry->d_name;
 292
 293                                 vn_mark_bad(vp);
 294
 295                                 if (S_ISDIR(mode))
 296                                         VOP_RMDIR(dvp, &teardown, NULL, err2);
 297                                 else
 298                                         VOP_REMOVE(dvp, &teardown, NULL, err2);
 299                                 VN_RELE(vp);
 300                         }
 301                 }
 302                 _ACL_FREE(default_acl);
 303         }
 304
 305         if (!error) {
 306                 ASSERT(vp);
 307                 ip = LINVFS_GET_IP(vp);
 308
 309                 if (S_ISCHR(mode) || S_ISBLK(mode))
 310                         ip->i_rdev = rdev;
 311                 else if (S_ISDIR(mode))
 312                         validate_fields(ip);
 313                 d_instantiate(dentry, ip);
 314                 validate_fields(dir);
 315         }
 316         return -error;
 317 }
 318
 319 STATIC int
 320 linvfs_create(
 321         struct inode    *dir,
 322         struct dentry   *dentry,
 323         int             mode,
 324         struct nameidata *nd)
 325 {
 326         return linvfs_mknod(dir, dentry, mode, 0);
 327 }
 328
 329 STATIC int
 330 linvfs_mkdir(
 331         struct inode    *dir,
 332         struct dentry   *dentry,
 333         int             mode)
 334 {
 335         return linvfs_mknod(dir, dentry, mode|S_IFDIR, 0);
 336 }
 337
 338 STATIC struct dentry *
 339 linvfs_lookup(
 340         struct inode    *dir,
 341         struct dentry   *dentry,
 342         struct nameidata *nd)
 343 {
 344         struct vnode    *vp = LINVFS_GET_VP(dir), *cvp;
 345         int             error;
 346
 347         if (dentry->d_name.len >= MAXNAMELEN)
 348                 return ERR_PTR(-ENAMETOOLONG);
 349
 350         VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
 351         if (error) {
 352                 if (unlikely(error != ENOENT))
 353                         return ERR_PTR(-error);
 354                 d_add(dentry, NULL);
 355                 return NULL;
 356         }
 357
 358         return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
 359 }
 360
 361 STATIC int
 362 linvfs_link(
 363         struct dentry   *old_dentry,
 364         struct inode    *dir,
 365         struct dentry   *dentry)
 366 {
 367         struct inode    *ip;    /* inode of guy being linked to */
 368         vnode_t         *tdvp;  /* target directory for new name/link */
 369         vnode_t         *vp;    /* vp of name being linked */
 370         int             error;
 371
 372         ip = old_dentry->d_inode;       /* inode being linked to */
 373         if (S_ISDIR(ip->i_mode))
 374                 return -EPERM;
 375
 376         tdvp = LINVFS_GET_VP(dir);
 377         vp = LINVFS_GET_VP(ip);
 378
 379         VOP_LINK(tdvp, vp, dentry, NULL, error);
 380         if (!error) {
 381                 VMODIFY(tdvp);
 382                 VN_HOLD(vp);
 383                 validate_fields(ip);
 384                 d_instantiate(dentry, ip);
 385         }
 386         return -error;
 387 }
 388
 389 STATIC int
 390 linvfs_unlink(
 391         struct inode    *dir,
 392         struct dentry   *dentry)
 393 {
 394         struct inode    *inode;
 395         vnode_t         *dvp;   /* directory containing name to remove */
 396         int             error;
 397
 398         inode = dentry->d_inode;
 399         dvp = LINVFS_GET_VP(dir);
 400
 401         VOP_REMOVE(dvp, dentry, NULL, error);
 402         if (!error) {
 403                 validate_fields(dir);   /* For size only */
 404                 validate_fields(inode);
 405         }
 406
 407         return -error;
 408 }
 409
 410 STATIC int
 411 linvfs_symlink(
 412         struct inode    *dir,
 413         struct dentry   *dentry,
 414         const char      *symname)
 415 {
 416         struct inode    *ip;
 417         vattr_t         va;
 418         vnode_t         *dvp;   /* directory containing name of symlink */
 419         vnode_t         *cvp;   /* used to lookup symlink to put in dentry */
 420         int             error;
 421
 422         dvp = LINVFS_GET_VP(dir);
 423         cvp = NULL;
 424
 425         memset(&va, 0, sizeof(va));
 426         va.va_mode = S_IFLNK |
 427                 (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
 428         va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 429
 430         error = 0;
 431         VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
 432         if (!error && cvp) {
 433                 ip = LINVFS_GET_IP(cvp);
 434                 d_instantiate(dentry, ip);
 435                 validate_fields(dir);
 436                 validate_fields(ip); /* size needs update */
 437         }
 438         return -error;
 439 }
 440
 441 STATIC int
 442 linvfs_rmdir(
 443         struct inode    *dir,
 444         struct dentry   *dentry)
 445 {
 446         struct inode    *inode = dentry->d_inode;
 447         vnode_t         *dvp = LINVFS_GET_VP(dir);
 448         int             error;
 449
 450         VOP_RMDIR(dvp, dentry, NULL, error);
 451         if (!error) {
 452                 validate_fields(inode);
 453                 validate_fields(dir);
 454         }
 455         return -error;
 456 }
 457
 458 STATIC int
 459 linvfs_rename(
 460         struct inode    *odir,
 461         struct dentry   *odentry,
 462         struct inode    *ndir,
 463         struct dentry   *ndentry)
 464 {
 465         struct inode    *new_inode = ndentry->d_inode;
 466         vnode_t         *fvp;   /* from directory */
 467         vnode_t         *tvp;   /* target directory */
 468         int             error;
 469
 470         fvp = LINVFS_GET_VP(odir);
 471         tvp = LINVFS_GET_VP(ndir);
 472
 473         VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
 474         if (error)
 475                 return -error;
 476
 477         if (new_inode)
 478                 validate_fields(new_inode);
 479
 480         validate_fields(odir);
 481         if (ndir != odir)
 482                 validate_fields(ndir);
 483         return 0;
 484 }
 485
 486 /*
 487  * careful here - this function can get called recursively, so
 488  * we need to be very careful about how much stack we use.
 489  * uio is kmalloced for this reason...
 490  */
 491 STATIC void *
 492 linvfs_follow_link(
 493         struct dentry           *dentry,
 494         struct nameidata        *nd)
 495 {
 496         vnode_t                 *vp;
 497         uio_t                   *uio;
 498         iovec_t                 iov;
 499         int                     error;
 500         char                    *link;
 501
 502         ASSERT(dentry);
 503         ASSERT(nd);
 504
 505         link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
 506         if (!link) {
 507                 nd_set_link(nd, ERR_PTR(-ENOMEM));
 508                 return NULL;
 509         }
 510
 511         uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
 512         if (!uio) {
 513                 kfree(link);
 514                 nd_set_link(nd, ERR_PTR(-ENOMEM));
 515                 return NULL;
 516         }
 517
 518         vp = LINVFS_GET_VP(dentry->d_inode);
 519
 520         iov.iov_base = link;
 521         iov.iov_len = MAXNAMELEN;
 522
 523         uio->uio_iov = &iov;
 524         uio->uio_offset = 0;
 525         uio->uio_segflg = UIO_SYSSPACE;
 526         uio->uio_resid = MAXNAMELEN;
 527         uio->uio_iovcnt = 1;
 528
 529         VOP_READLINK(vp, uio, 0, NULL, error);
 530         if (error) {
 531                 kfree(link);
 532                 link = ERR_PTR(-error);
 533         } else {
 534                 link[MAXNAMELEN - uio->uio_resid] = '\0';
 535         }
 536         kfree(uio);
 537
 538         nd_set_link(nd, link);
 539         return NULL;
 540 }
 541
 542 STATIC void
 543 linvfs_put_link(
 544         struct dentry   *dentry,
 545         struct nameidata *nd,
 546         void            *p)
 547 {
 548         char            *s = nd_get_link(nd);
 549
 550         if (!IS_ERR(s))
 551                 kfree(s);
 552 }
 553
 554 #ifdef CONFIG_XFS_POSIX_ACL
 555 STATIC int
 556 linvfs_permission(
 557         struct inode    *inode,
 558         int             mode,
 559         struct nameidata *nd)
 560 {
 561         vnode_t         *vp = LINVFS_GET_VP(inode);
 562         int             error;
 563
 564         mode <<= 6;             /* convert from linux to vnode access bits */
 565         VOP_ACCESS(vp, mode, NULL, error);
 566         return -error;
 567 }
 568 #else
 569 #define linvfs_permission NULL
 570 #endif
 571
 572 STATIC int
 573 linvfs_getattr(
 574         struct vfsmount *mnt,
 575         struct dentry   *dentry,
 576         struct kstat    *stat)
 577 {
 578         struct inode    *inode = dentry->d_inode;
 579         vnode_t         *vp = LINVFS_GET_VP(inode);
 580         int             error = 0;
 581
 582         if (unlikely(vp->v_flag & VMODIFIED))
 583                 error = vn_revalidate(vp);
 584         if (!error)
 585                 generic_fillattr(inode, stat);
 586         return 0;
 587 }
 588
 589 STATIC int
 590 linvfs_setattr(
 591         struct dentry   *dentry,
 592         struct iattr    *attr)
 593 {
 594         struct inode    *inode = dentry->d_inode;
 595         unsigned int    ia_valid = attr->ia_valid;
 596         vnode_t         *vp = LINVFS_GET_VP(inode);
 597         vattr_t         vattr;
 598         int             flags = 0;
 599         int             error;
 600
 601         memset(&vattr, 0, sizeof(vattr_t));
 602         if (ia_valid & ATTR_UID) {
 603                 vattr.va_mask |= XFS_AT_UID;
 604                 vattr.va_uid = attr->ia_uid;
 605         }
 606         if (ia_valid & ATTR_GID) {
 607                 vattr.va_mask |= XFS_AT_GID;
 608                 vattr.va_gid = attr->ia_gid;
 609         }
 610         if (ia_valid & ATTR_SIZE) {
 611                 vattr.va_mask |= XFS_AT_SIZE;
 612                 vattr.va_size = attr->ia_size;
 613         }
 614         if (ia_valid & ATTR_ATIME) {
 615                 vattr.va_mask |= XFS_AT_ATIME;
 616                 vattr.va_atime = attr->ia_atime;
 617         }
 618         if (ia_valid & ATTR_MTIME) {
 619                 vattr.va_mask |= XFS_AT_MTIME;
 620                 vattr.va_mtime = attr->ia_mtime;
 621         }
 622         if (ia_valid & ATTR_CTIME) {
 623                 vattr.va_mask |= XFS_AT_CTIME;
 624                 vattr.va_ctime = attr->ia_ctime;
 625         }
 626         if (ia_valid & ATTR_MODE) {
 627                 vattr.va_mask |= XFS_AT_MODE;
 628                 vattr.va_mode = attr->ia_mode;
 629                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 630                         inode->i_mode &= ~S_ISGID;
 631         }
 632
 633         if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
 634                 flags |= ATTR_UTIME;
 635 #ifdef ATTR_NO_BLOCK
 636         if ((ia_valid & ATTR_NO_BLOCK))
 637                 flags |= ATTR_NONBLOCK;
 638 #endif
 639
 640         VOP_SETATTR(vp, &vattr, flags, NULL, error);
 641         if (error)
 642                 return -error;
 643         vn_revalidate(vp);
 644         return error;
 645 }
 646
 647 STATIC void
 648 linvfs_truncate(
 649         struct inode    *inode)
 650 {
 651         block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block);
 652 }
 653
 654 STATIC int
 655 linvfs_setxattr(
 656         struct dentry   *dentry,
 657         const char      *name,
 658         const void      *data,
 659         size_t          size,
 660         int             flags)
 661 {
 662         vnode_t         *vp = LINVFS_GET_VP(dentry->d_inode);
 663         char            *attr = (char *)name;
 664         attrnames_t     *namesp;
 665         int             xflags = 0;
 666         int             error;
 667
 668         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 669         if (!namesp)
 670                 return -EOPNOTSUPP;
 671         attr += namesp->attr_namelen;
 672         error = namesp->attr_capable(vp, NULL);
 673         if (error)
 674                 return error;
 675
 676         /* Convert Linux syscall to XFS internal ATTR flags */
 677         if (flags & XATTR_CREATE)
 678                 xflags |= ATTR_CREATE;
 679         if (flags & XATTR_REPLACE)
 680                 xflags |= ATTR_REPLACE;
 681         xflags |= namesp->attr_flag;
 682         return namesp->attr_set(vp, attr, (void *)data, size, xflags);
 683 }
 684
 685 STATIC ssize_t
 686 linvfs_getxattr(
 687         struct dentry   *dentry,
 688         const char      *name,
 689         void            *data,
 690         size_t          size)
 691 {
 692         vnode_t         *vp = LINVFS_GET_VP(dentry->d_inode);
 693         char            *attr = (char *)name;
 694         attrnames_t     *namesp;
 695         int             xflags = 0;
 696         ssize_t         error;
 697
 698         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 699         if (!namesp)
 700                 return -EOPNOTSUPP;
 701         attr += namesp->attr_namelen;
 702         error = namesp->attr_capable(vp, NULL);
 703         if (error)
 704                 return error;
 705
 706         /* Convert Linux syscall to XFS internal ATTR flags */
 707         if (!size) {
 708                 xflags |= ATTR_KERNOVAL;
 709                 data = NULL;
 710         }
 711         xflags |= namesp->attr_flag;
 712         return namesp->attr_get(vp, attr, (void *)data, size, xflags);
 713 }
 714
 715 STATIC ssize_t
 716 linvfs_listxattr(
 717         struct dentry           *dentry,
 718         char                    *data,
 719         size_t                  size)
 720 {
 721         vnode_t                 *vp = LINVFS_GET_VP(dentry->d_inode);
 722         int                     error, xflags = ATTR_KERNAMELS;
 723         ssize_t                 result;
 724
 725         if (!size)
 726                 xflags |= ATTR_KERNOVAL;
 727         xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;
 728
 729         error = attr_generic_list(vp, data, size, xflags, &result);
 730         if (error < 0)
 731                 return error;
 732         return result;
 733 }
 734
 735 STATIC int
 736 linvfs_removexattr(
 737         struct dentry   *dentry,
 738         const char      *name)
 739 {
 740         vnode_t         *vp = LINVFS_GET_VP(dentry->d_inode);
 741         char            *attr = (char *)name;
 742         attrnames_t     *namesp;
 743         int             xflags = 0;
 744         int             error;
 745
 746         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 747         if (!namesp)
 748                 return -EOPNOTSUPP;
 749         attr += namesp->attr_namelen;
 750         error = namesp->attr_capable(vp, NULL);
 751         if (error)
 752                 return error;
 753         xflags |= namesp->attr_flag;
 754         return namesp->attr_remove(vp, attr, xflags);
 755 }
 756
 757
 758 struct inode_operations linvfs_file_inode_operations = {
 759         .permission             = linvfs_permission,
 760         .truncate               = linvfs_truncate,
 761         .getattr                = linvfs_getattr,
 762         .setattr                = linvfs_setattr,
 763         .setxattr               = linvfs_setxattr,
 764         .getxattr               = linvfs_getxattr,
 765         .listxattr              = linvfs_listxattr,
 766         .removexattr            = linvfs_removexattr,
 767 };
 768
 769 struct inode_operations linvfs_dir_inode_operations = {
 770         .create                 = linvfs_create,
 771         .lookup                 = linvfs_lookup,
 772         .link                   = linvfs_link,
 773         .unlink                 = linvfs_unlink,
 774         .symlink                = linvfs_symlink,
 775         .mkdir                  = linvfs_mkdir,
 776         .rmdir                  = linvfs_rmdir,
 777         .mknod                  = linvfs_mknod,
 778         .rename                 = linvfs_rename,
 779         .permission             = linvfs_permission,
 780         .getattr                = linvfs_getattr,
 781         .setattr                = linvfs_setattr,
 782         .setxattr               = linvfs_setxattr,
 783         .getxattr               = linvfs_getxattr,
 784         .listxattr              = linvfs_listxattr,
 785         .removexattr            = linvfs_removexattr,
 786 };
 787
 788 struct inode_operations linvfs_symlink_inode_operations = {
 789         .readlink               = generic_readlink,
 790         .follow_link            = linvfs_follow_link,
 791         .put_link               = linvfs_put_link,
 792         .permission             = linvfs_permission,
 793         .getattr                = linvfs_getattr,
 794         .setattr                = linvfs_setattr,
 795         .setxattr               = linvfs_setxattr,
 796         .getxattr               = linvfs_getxattr,
 797         .listxattr              = linvfs_listxattr,
 798         .removexattr            = linvfs_removexattr,
 799 };