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/capability.h>
  55 #include <linux/xattr.h>
  56 #include <linux/namei.h>
  57 #include <linux/security.h>
  58
  59 /*
  60  * Get a XFS inode from a given vnode.
  61  */
  62 xfs_inode_t *
  63 xfs_vtoi(
  64         struct vnode    *vp)
  65 {
  66         bhv_desc_t      *bdp;
  67
  68         bdp = bhv_lookup_range(VN_BHV_HEAD(vp),
  69                         VNODE_POSITION_XFS, VNODE_POSITION_XFS);
  70         if (unlikely(bdp == NULL))
  71                 return NULL;
  72         return XFS_BHVTOI(bdp);
  73 }
  74
  75 /*
  76  * Bring the atime in the XFS inode uptodate.
  77  * Used before logging the inode to disk or when the Linux inode goes away.
  78  */
  79 void
  80 xfs_synchronize_atime(
  81         xfs_inode_t     *ip)
  82 {
  83         vnode_t         *vp;
  84
  85         vp = XFS_ITOV_NULL(ip);
  86         if (vp) {
  87                 struct inode *inode = &vp->v_inode;
  88                 ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
  89                 ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
  90         }
  91 }
  92
  93 /*
  94  * Change the requested timestamp in the given inode.
  95  * We don't lock across timestamp updates, and we don't log them but
  96  * we do record the fact that there is dirty information in core.
  97  *
  98  * NOTE -- callers MUST combine XFS_ICHGTIME_MOD or XFS_ICHGTIME_CHG
  99  *              with XFS_ICHGTIME_ACC to be sure that access time
 100  *              update will take.  Calling first with XFS_ICHGTIME_ACC
 101  *              and then XFS_ICHGTIME_MOD may fail to modify the access
 102  *              timestamp if the filesystem is mounted noacctm.
 103  */
 104 void
 105 xfs_ichgtime(
 106         xfs_inode_t     *ip,
 107         int             flags)
 108 {
 109         struct inode    *inode = LINVFS_GET_IP(XFS_ITOV(ip));
 110         timespec_t      tv;
 111
 112         nanotime(&tv);
 113         if (flags & XFS_ICHGTIME_MOD) {
 114                 inode->i_mtime = tv;
 115                 ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
 116                 ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
 117         }
 118         if (flags & XFS_ICHGTIME_ACC) {
 119                 inode->i_atime = tv;
 120                 ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec;
 121                 ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec;
 122         }
 123         if (flags & XFS_ICHGTIME_CHG) {
 124                 inode->i_ctime = tv;
 125                 ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec;
 126                 ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec;
 127         }
 128
 129         /*
 130          * We update the i_update_core field _after_ changing
 131          * the timestamps in order to coordinate properly with
 132          * xfs_iflush() so that we don't lose timestamp updates.
 133          * This keeps us from having to hold the inode lock
 134          * while doing this.  We use the SYNCHRONIZE macro to
 135          * ensure that the compiler does not reorder the update
 136          * of i_update_core above the timestamp updates above.
 137          */
 138         SYNCHRONIZE();
 139         ip->i_update_core = 1;
 140         if (!(inode->i_state & I_LOCK))
 141                 mark_inode_dirty_sync(inode);
 142 }
 143
 144 /*
 145  * Variant on the above which avoids querying the system clock
 146  * in situations where we know the Linux inode timestamps have
 147  * just been updated (and so we can update our inode cheaply).
 148  */
 149 void
 150 xfs_ichgtime_fast(
 151         xfs_inode_t     *ip,
 152         struct inode    *inode,
 153         int             flags)
 154 {
 155         timespec_t      *tvp;
 156
 157         /*
 158          * Atime updates for read() & friends are handled lazily now, and
 159          * explicit updates must go through xfs_ichgtime()
 160          */
 161         ASSERT((flags & XFS_ICHGTIME_ACC) == 0);
 162
 163         /*
 164          * We're not supposed to change timestamps in readonly-mounted
 165          * filesystems.  Throw it away if anyone asks us.
 166          */
 167         if (unlikely(IS_RDONLY(inode)))
 168                 return;
 169
 170         if (flags & XFS_ICHGTIME_MOD) {
 171                 tvp = &inode->i_mtime;
 172                 ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec;
 173                 ip->i_d.di_mtime.t_nsec = (__int32_t)tvp->tv_nsec;
 174         }
 175         if (flags & XFS_ICHGTIME_CHG) {
 176                 tvp = &inode->i_ctime;
 177                 ip->i_d.di_ctime.t_sec = (__int32_t)tvp->tv_sec;
 178                 ip->i_d.di_ctime.t_nsec = (__int32_t)tvp->tv_nsec;
 179         }
 180
 181         /*
 182          * We update the i_update_core field _after_ changing
 183          * the timestamps in order to coordinate properly with
 184          * xfs_iflush() so that we don't lose timestamp updates.
 185          * This keeps us from having to hold the inode lock
 186          * while doing this.  We use the SYNCHRONIZE macro to
 187          * ensure that the compiler does not reorder the update
 188          * of i_update_core above the timestamp updates above.
 189          */
 190         SYNCHRONIZE();
 191         ip->i_update_core = 1;
 192         if (!(inode->i_state & I_LOCK))
 193                 mark_inode_dirty_sync(inode);
 194 }
 195
 196
 197 /*
 198  * Pull the link count and size up from the xfs inode to the linux inode
 199  */
 200 STATIC void
 201 __linvfs_validate_fields(
 202         struct inode    *ip,
 203         struct vattr    *vattr)
 204 {
 205         vnode_t         *vp = LINVFS_GET_VP(ip);
 206         int             error;
 207
 208         vattr->va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
 209         VOP_GETATTR(vp, vattr, ATTR_LAZY, NULL, error);
 210         if (likely(!error)) {
 211                 ip->i_nlink = vattr->va_nlink;
 212                 ip->i_blocks = vattr->va_nblocks;
 213
 214                 /* we're under i_sem so i_size can't change under us */
 215                 if (i_size_read(ip) != vattr->va_size)
 216                         i_size_write(ip, vattr->va_size);
 217         }
 218 }
 219
 220 /*
 221  * Hook in SELinux.  This is not quite correct yet, what we really need
 222  * here (as we do for default ACLs) is a mechanism by which creation of
 223  * these attrs can be journalled at inode creation time (along with the
 224  * inode, of course, such that log replay can't cause these to be lost).
 225  */
 226 STATIC int
 227 __linvfs_init_security(
 228         struct vnode    *vp,
 229         struct inode    *dir)
 230 {
 231         struct inode    *ip = LINVFS_GET_IP(vp);
 232         size_t          length;
 233         void            *value;
 234         char            *name;
 235         int             error;
 236
 237         error = security_inode_init_security(ip, dir, &name, &value, &length);
 238         if (error) {
 239                 if (error == -EOPNOTSUPP)
 240                         return 0;
 241                 return -error;
 242         }
 243
 244         VOP_ATTR_SET(vp, name, value, length, ATTR_SECURE, NULL, error);
 245         if (!error)
 246                 VMODIFY(vp);
 247
 248         kfree(name);
 249         kfree(value);
 250         return error;
 251 }
 252
 253 /*
 254  * Determine whether a process has a valid fs_struct (kernel daemons
 255  * like knfsd don't have an fs_struct).
 256  *
 257  * XXX(hch):  nfsd is broken, better fix it instead.
 258  */
 259 STATIC inline int
 260 __linvfs_has_fs_struct(struct task_struct *task)
 261 {
 262         return (task->fs != init_task.fs);
 263 }
 264
 265 STATIC inline void
 266 __linvfs_cleanup_inode(
 267         vnode_t         *dvp,
 268         vnode_t         *vp,
 269         struct dentry   *dentry,
 270         int             mode)
 271 {
 272         struct dentry   teardown = {};
 273         int             error;
 274
 275         /* Oh, the horror.
 276          * If we can't add the ACL or we fail in
 277          * linvfs_init_security we must back out.
 278          * ENOSPC can hit here, among other things.
 279          */
 280         teardown.d_inode = LINVFS_GET_IP(vp);
 281         teardown.d_name = dentry->d_name;
 282
 283         if (S_ISDIR(mode))
 284                 VOP_RMDIR(dvp, &teardown, NULL, error);
 285         else
 286                 VOP_REMOVE(dvp, &teardown, NULL, error);
 287         VN_RELE(vp);
 288 }
 289
 290 STATIC int
 291 linvfs_mknod(
 292         struct inode    *dir,
 293         struct dentry   *dentry,
 294         int             mode,
 295         dev_t           rdev)
 296 {
 297         struct inode    *ip;
 298         vattr_t         *vattr;
 299         vnode_t         *vp = NULL, *dvp = LINVFS_GET_VP(dir);
 300         xfs_acl_t       *default_acl = NULL;
 301         attrexists_t    test_default_acl = _ACL_DEFAULT_EXISTS;
 302         int             error;
 303
 304         /*
 305          * Irix uses Missed'em'V split, but doesn't want to see
 306          * the upper 5 bits of (14bit) major.
 307          */
 308         if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
 309                 return -EINVAL;
 310
 311         vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
 312         if (unlikely(!vattr))
 313                 return -ENOMEM;
 314
 315         if (unlikely(test_default_acl && test_default_acl(dvp))) {
 316                 if (!_ACL_ALLOC(default_acl)) {
 317                         kfree(vattr);
 318                         return -ENOMEM;
 319                 }
 320                 if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
 321                         _ACL_FREE(default_acl);
 322                         default_acl = NULL;
 323                 }
 324         }
 325
 326         if (IS_POSIXACL(dir) && !default_acl && __linvfs_has_fs_struct(current))
 327                 mode &= ~current->fs->umask;
 328
 329         memset(vattr, 0, sizeof(*vattr));
 330         vattr->va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 331         vattr->va_mode = mode;
 332
 333         switch (mode & S_IFMT) {
 334         case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
 335                 vattr->va_rdev = sysv_encode_dev(rdev);
 336                 vattr->va_mask |= XFS_AT_RDEV;
 337                 /*FALLTHROUGH*/
 338         case S_IFREG:
 339                 VOP_CREATE(dvp, dentry, vattr, &vp, NULL, error);
 340                 break;
 341         case S_IFDIR:
 342                 VOP_MKDIR(dvp, dentry, vattr, &vp, NULL, error);
 343                 break;
 344         default:
 345                 error = EINVAL;
 346                 break;
 347         }
 348
 349         if (unlikely(!error)) {
 350                 error = __linvfs_init_security(vp, dir);
 351                 if (error)
 352                         __linvfs_cleanup_inode(dvp, vp, dentry, mode);
 353         }
 354
 355         if (unlikely(default_acl)) {
 356                 if (!error) {
 357                         error = _ACL_INHERIT(vp, vattr, default_acl);
 358                         if (!error)
 359                                 VMODIFY(vp);
 360                         else
 361                                 __linvfs_cleanup_inode(dvp, vp, dentry, mode);
 362                 }
 363                 _ACL_FREE(default_acl);
 364         }
 365
 366         if (likely(!error)) {
 367                 ASSERT(vp);
 368                 ip = LINVFS_GET_IP(vp);
 369
 370                 if (S_ISCHR(mode) || S_ISBLK(mode))
 371                         ip->i_rdev = rdev;
 372                 else if (S_ISDIR(mode))
 373                         __linvfs_validate_fields(ip, vattr);
 374                 d_instantiate(dentry, ip);
 375                 __linvfs_validate_fields(dir, vattr);
 376         }
 377         kfree(vattr);
 378         return -error;
 379 }
 380
 381 STATIC int
 382 linvfs_create(
 383         struct inode    *dir,
 384         struct dentry   *dentry,
 385         int             mode,
 386         struct nameidata *nd)
 387 {
 388         return linvfs_mknod(dir, dentry, mode, 0);
 389 }
 390
 391 STATIC int
 392 linvfs_mkdir(
 393         struct inode    *dir,
 394         struct dentry   *dentry,
 395         int             mode)
 396 {
 397         return linvfs_mknod(dir, dentry, mode|S_IFDIR, 0);
 398 }
 399
 400 STATIC struct dentry *
 401 linvfs_lookup(
 402         struct inode    *dir,
 403         struct dentry   *dentry,
 404         struct nameidata *nd)
 405 {
 406         struct vnode    *vp = LINVFS_GET_VP(dir), *cvp;
 407         int             error;
 408
 409         if (dentry->d_name.len >= MAXNAMELEN)
 410                 return ERR_PTR(-ENAMETOOLONG);
 411
 412         VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
 413         if (error) {
 414                 if (unlikely(error != ENOENT))
 415                         return ERR_PTR(-error);
 416                 d_add(dentry, NULL);
 417                 return NULL;
 418         }
 419
 420         return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
 421 }
 422
 423 STATIC int
 424 linvfs_link(
 425         struct dentry   *old_dentry,
 426         struct inode    *dir,
 427         struct dentry   *dentry)
 428 {
 429         struct inode    *ip;    /* inode of guy being linked to */
 430         vnode_t         *tdvp;  /* target directory for new name/link */
 431         vnode_t         *vp;    /* vp of name being linked */
 432         vattr_t         *vattr;
 433         int             error;
 434
 435         ip = old_dentry->d_inode;       /* inode being linked to */
 436         if (S_ISDIR(ip->i_mode))
 437                 return -EPERM;
 438
 439         vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
 440         if (unlikely(!vattr))
 441                 return -ENOMEM;
 442
 443         tdvp = LINVFS_GET_VP(dir);
 444         vp = LINVFS_GET_VP(ip);
 445
 446         VOP_LINK(tdvp, vp, dentry, NULL, error);
 447         if (likely(!error)) {
 448                 VMODIFY(tdvp);
 449                 VN_HOLD(vp);
 450                 __linvfs_validate_fields(ip, vattr);
 451                 d_instantiate(dentry, ip);
 452         }
 453         kfree(vattr);
 454         return -error;
 455 }
 456
 457 STATIC int
 458 linvfs_unlink(
 459         struct inode    *dir,
 460         struct dentry   *dentry)
 461 {
 462         struct inode    *inode;
 463         vnode_t         *dvp;   /* directory containing name to remove */
 464         vattr_t         *vattr;
 465         int             error;
 466
 467         vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
 468         if (unlikely(!vattr))
 469                 return -ENOMEM;
 470
 471         inode = dentry->d_inode;
 472         dvp = LINVFS_GET_VP(dir);
 473
 474         VOP_REMOVE(dvp, dentry, NULL, error);
 475         if (likely(!error)) {
 476                 __linvfs_validate_fields(dir, vattr);   /* size needs update */
 477                 __linvfs_validate_fields(inode, vattr);
 478         }
 479         kfree(vattr);
 480         return -error;
 481 }
 482
 483 STATIC int
 484 linvfs_symlink(
 485         struct inode    *dir,
 486         struct dentry   *dentry,
 487         const char      *symname)
 488 {
 489         struct inode    *ip;
 490         vattr_t         *vattr;
 491         vnode_t         *dvp;   /* directory containing name of symlink */
 492         vnode_t         *cvp;   /* used to lookup symlink to put in dentry */
 493         int             error;
 494
 495         dvp = LINVFS_GET_VP(dir);
 496         cvp = NULL;
 497
 498         vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
 499         if (unlikely(!vattr))
 500                 return -ENOMEM;
 501
 502         memset(vattr, 0, sizeof(*vattr));
 503         vattr->va_mode = S_IFLNK |
 504                 (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
 505         vattr->va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 506
 507         error = 0;
 508         VOP_SYMLINK(dvp, dentry, vattr, (char *)symname, &cvp, NULL, error);
 509         if (likely(!error && cvp)) {
 510                 error = __linvfs_init_security(cvp, dir);
 511                 if (likely(!error)) {
 512                         ip = LINVFS_GET_IP(cvp);
 513                         d_instantiate(dentry, ip);
 514                         __linvfs_validate_fields(dir, vattr);
 515                         __linvfs_validate_fields(ip, vattr);
 516                 }
 517         }
 518         kfree(vattr);
 519         return -error;
 520 }
 521
 522 STATIC int
 523 linvfs_rmdir(
 524         struct inode    *dir,
 525         struct dentry   *dentry)
 526 {
 527         struct inode    *inode = dentry->d_inode;
 528         vnode_t         *dvp = LINVFS_GET_VP(dir);
 529         vattr_t         *vattr;
 530         int             error;
 531
 532         vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
 533         if (unlikely(!vattr))
 534                 return -ENOMEM;
 535
 536         VOP_RMDIR(dvp, dentry, NULL, error);
 537         if (likely(!error)) {
 538                 __linvfs_validate_fields(inode, vattr);
 539                 __linvfs_validate_fields(dir, vattr);
 540         }
 541         kfree(vattr);
 542         return -error;
 543 }
 544
 545 STATIC int
 546 linvfs_rename(
 547         struct inode    *odir,
 548         struct dentry   *odentry,
 549         struct inode    *ndir,
 550         struct dentry   *ndentry)
 551 {
 552         struct inode    *new_inode = ndentry->d_inode;
 553         vnode_t         *fvp;   /* from directory */
 554         vnode_t         *tvp;   /* target directory */
 555         vattr_t         *vattr;
 556         int             error;
 557
 558         vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
 559         if (unlikely(!vattr))
 560                 return -ENOMEM;
 561
 562         fvp = LINVFS_GET_VP(odir);
 563         tvp = LINVFS_GET_VP(ndir);
 564
 565         VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
 566         if (likely(!error)) {
 567                 if (new_inode)
 568                         __linvfs_validate_fields(new_inode, vattr);
 569                 __linvfs_validate_fields(odir, vattr);
 570                 if (ndir != odir)
 571                         __linvfs_validate_fields(ndir, vattr);
 572         }
 573         kfree(vattr);
 574         return -error;
 575 }
 576
 577 /*
 578  * careful here - this function can get called recursively, so
 579  * we need to be very careful about how much stack we use.
 580  * uio is kmalloced for this reason...
 581  */
 582 STATIC void *
 583 linvfs_follow_link(
 584         struct dentry           *dentry,
 585         struct nameidata        *nd)
 586 {
 587         vnode_t                 *vp;
 588         uio_t                   *uio;
 589         iovec_t                 iov;
 590         int                     error;
 591         char                    *link;
 592
 593         ASSERT(dentry);
 594         ASSERT(nd);
 595
 596         link = (char *)kmalloc(MAXPATHLEN+1, GFP_KERNEL);
 597         if (!link) {
 598                 nd_set_link(nd, ERR_PTR(-ENOMEM));
 599                 return NULL;
 600         }
 601
 602         uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
 603         if (!uio) {
 604                 kfree(link);
 605                 nd_set_link(nd, ERR_PTR(-ENOMEM));
 606                 return NULL;
 607         }
 608
 609         vp = LINVFS_GET_VP(dentry->d_inode);
 610
 611         iov.iov_base = link;
 612         iov.iov_len = MAXPATHLEN;
 613
 614         uio->uio_iov = &iov;
 615         uio->uio_offset = 0;
 616         uio->uio_segflg = UIO_SYSSPACE;
 617         uio->uio_resid = MAXPATHLEN;
 618         uio->uio_iovcnt = 1;
 619
 620         VOP_READLINK(vp, uio, 0, NULL, error);
 621         if (error) {
 622                 kfree(link);
 623                 link = ERR_PTR(-error);
 624         } else {
 625                 link[MAXPATHLEN - uio->uio_resid] = '\0';
 626         }
 627         kfree(uio);
 628
 629         nd_set_link(nd, link);
 630         return NULL;
 631 }
 632
 633 STATIC void
 634 linvfs_put_link(
 635         struct dentry   *dentry,
 636         struct nameidata *nd,
 637         void            *p)
 638 {
 639         char            *s = nd_get_link(nd);
 640
 641         if (!IS_ERR(s))
 642                 kfree(s);
 643 }
 644
 645 #ifdef CONFIG_XFS_POSIX_ACL
 646 STATIC int
 647 linvfs_permission(
 648         struct inode    *inode,
 649         int             mode,
 650         struct nameidata *nd)
 651 {
 652         vnode_t         *vp = LINVFS_GET_VP(inode);
 653         int             error;
 654
 655         mode <<= 6;             /* convert from linux to vnode access bits */
 656         VOP_ACCESS(vp, mode, NULL, error);
 657         return -error;
 658 }
 659 #else
 660 #define linvfs_permission NULL
 661 #endif
 662
 663 STATIC int
 664 linvfs_getattr(
 665         struct vfsmount *mnt,
 666         struct dentry   *dentry,
 667         struct kstat    *stat)
 668 {
 669         struct inode    *inode = dentry->d_inode;
 670         vnode_t         *vp = LINVFS_GET_VP(inode);
 671         int             error = 0;
 672
 673         if (unlikely(vp->v_flag & VMODIFIED))
 674                 error = vn_revalidate(vp);
 675         if (!error)
 676                 generic_fillattr(inode, stat);
 677         return 0;
 678 }
 679
 680 STATIC int
 681 linvfs_setattr(
 682         struct dentry   *dentry,
 683         struct iattr    *attr)
 684 {
 685         struct inode    *inode = dentry->d_inode;
 686         unsigned int    ia_valid = attr->ia_valid;
 687         vnode_t         *vp = LINVFS_GET_VP(inode);
 688         vattr_t         vattr = { 0 };
 689         int             flags = 0;
 690         int             error;
 691
 692         if (ia_valid & ATTR_UID) {
 693                 vattr.va_mask |= XFS_AT_UID;
 694                 vattr.va_uid = attr->ia_uid;
 695         }
 696         if (ia_valid & ATTR_GID) {
 697                 vattr.va_mask |= XFS_AT_GID;
 698                 vattr.va_gid = attr->ia_gid;
 699         }
 700         if (ia_valid & ATTR_SIZE) {
 701                 vattr.va_mask |= XFS_AT_SIZE;
 702                 vattr.va_size = attr->ia_size;
 703         }
 704         if (ia_valid & ATTR_ATIME) {
 705                 vattr.va_mask |= XFS_AT_ATIME;
 706                 vattr.va_atime = attr->ia_atime;
 707                 if (ia_valid & ATTR_ATIME_SET)
 708                         inode->i_atime = attr->ia_atime;
 709         }
 710         if (ia_valid & ATTR_MTIME) {
 711                 vattr.va_mask |= XFS_AT_MTIME;
 712                 vattr.va_mtime = attr->ia_mtime;
 713         }
 714         if (ia_valid & ATTR_CTIME) {
 715                 vattr.va_mask |= XFS_AT_CTIME;
 716                 vattr.va_ctime = attr->ia_ctime;
 717         }
 718         if (ia_valid & ATTR_MODE) {
 719                 vattr.va_mask |= XFS_AT_MODE;
 720                 vattr.va_mode = attr->ia_mode;
 721                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 722                         inode->i_mode &= ~S_ISGID;
 723         }
 724
 725         if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
 726                 flags |= ATTR_UTIME;
 727 #ifdef ATTR_NO_BLOCK
 728         if ((ia_valid & ATTR_NO_BLOCK))
 729                 flags |= ATTR_NONBLOCK;
 730 #endif
 731
 732         VOP_SETATTR(vp, &vattr, flags, NULL, error);
 733         if (likely(!error))
 734                 __vn_revalidate(vp, &vattr);
 735         return -error;
 736 }
 737
 738 STATIC void
 739 linvfs_truncate(
 740         struct inode    *inode)
 741 {
 742         block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block);
 743 }
 744
 745 STATIC int
 746 linvfs_setxattr(
 747         struct dentry   *dentry,
 748         const char      *name,
 749         const void      *data,
 750         size_t          size,
 751         int             flags)
 752 {
 753         vnode_t         *vp = LINVFS_GET_VP(dentry->d_inode);
 754         char            *attr = (char *)name;
 755         attrnames_t     *namesp;
 756         int             xflags = 0;
 757         int             error;
 758
 759         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 760         if (!namesp)
 761                 return -EOPNOTSUPP;
 762         attr += namesp->attr_namelen;
 763         error = namesp->attr_capable(vp, NULL);
 764         if (error)
 765                 return error;
 766
 767         /* Convert Linux syscall to XFS internal ATTR flags */
 768         if (flags & XATTR_CREATE)
 769                 xflags |= ATTR_CREATE;
 770         if (flags & XATTR_REPLACE)
 771                 xflags |= ATTR_REPLACE;
 772         xflags |= namesp->attr_flag;
 773         return namesp->attr_set(vp, attr, (void *)data, size, xflags);
 774 }
 775
 776 STATIC ssize_t
 777 linvfs_getxattr(
 778         struct dentry   *dentry,
 779         const char      *name,
 780         void            *data,
 781         size_t          size)
 782 {
 783         vnode_t         *vp = LINVFS_GET_VP(dentry->d_inode);
 784         char            *attr = (char *)name;
 785         attrnames_t     *namesp;
 786         int             xflags = 0;
 787         ssize_t         error;
 788
 789         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 790         if (!namesp)
 791                 return -EOPNOTSUPP;
 792         attr += namesp->attr_namelen;
 793         error = namesp->attr_capable(vp, NULL);
 794         if (error)
 795                 return error;
 796
 797         /* Convert Linux syscall to XFS internal ATTR flags */
 798         if (!size) {
 799                 xflags |= ATTR_KERNOVAL;
 800                 data = NULL;
 801         }
 802         xflags |= namesp->attr_flag;
 803         return namesp->attr_get(vp, attr, (void *)data, size, xflags);
 804 }
 805
 806 STATIC ssize_t
 807 linvfs_listxattr(
 808         struct dentry           *dentry,
 809         char                    *data,
 810         size_t                  size)
 811 {
 812         vnode_t                 *vp = LINVFS_GET_VP(dentry->d_inode);
 813         int                     error, xflags = ATTR_KERNAMELS;
 814         ssize_t                 result;
 815
 816         if (!size)
 817                 xflags |= ATTR_KERNOVAL;
 818         xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;
 819
 820         error = attr_generic_list(vp, data, size, xflags, &result);
 821         if (error < 0)
 822                 return error;
 823         return result;
 824 }
 825
 826 STATIC int
 827 linvfs_removexattr(
 828         struct dentry   *dentry,
 829         const char      *name)
 830 {
 831         vnode_t         *vp = LINVFS_GET_VP(dentry->d_inode);
 832         char            *attr = (char *)name;
 833         attrnames_t     *namesp;
 834         int             xflags = 0;
 835         int             error;
 836
 837         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 838         if (!namesp)
 839                 return -EOPNOTSUPP;
 840         attr += namesp->attr_namelen;
 841         error = namesp->attr_capable(vp, NULL);
 842         if (error)
 843                 return error;
 844         xflags |= namesp->attr_flag;
 845         return namesp->attr_remove(vp, attr, xflags);
 846 }
 847
 848
 849 struct inode_operations linvfs_file_inode_operations = {
 850         .permission             = linvfs_permission,
 851         .truncate               = linvfs_truncate,
 852         .getattr                = linvfs_getattr,
 853         .setattr                = linvfs_setattr,
 854         .setxattr               = linvfs_setxattr,
 855         .getxattr               = linvfs_getxattr,
 856         .listxattr              = linvfs_listxattr,
 857         .removexattr            = linvfs_removexattr,
 858 };
 859
 860 struct inode_operations linvfs_dir_inode_operations = {
 861         .create                 = linvfs_create,
 862         .lookup                 = linvfs_lookup,
 863         .link                   = linvfs_link,
 864         .unlink                 = linvfs_unlink,
 865         .symlink                = linvfs_symlink,
 866         .mkdir                  = linvfs_mkdir,
 867         .rmdir                  = linvfs_rmdir,
 868         .mknod                  = linvfs_mknod,
 869         .rename                 = linvfs_rename,
 870         .permission             = linvfs_permission,
 871         .getattr                = linvfs_getattr,
 872         .setattr                = linvfs_setattr,
 873         .setxattr               = linvfs_setxattr,
 874         .getxattr               = linvfs_getxattr,
 875         .listxattr              = linvfs_listxattr,
 876         .removexattr            = linvfs_removexattr,
 877 };
 878
 879 struct inode_operations linvfs_symlink_inode_operations = {
 880         .readlink               = generic_readlink,
 881         .follow_link            = linvfs_follow_link,
 882         .put_link               = linvfs_put_link,
 883         .permission             = linvfs_permission,
 884         .getattr                = linvfs_getattr,
 885         .setattr                = linvfs_setattr,
 886         .setxattr               = linvfs_setxattr,
 887         .getxattr               = linvfs_getxattr,
 888         .listxattr              = linvfs_listxattr,
 889         .removexattr            = linvfs_removexattr,
 890 };