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 = vn_to_inode(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 xfs_validate_fields(
 202         struct inode    *ip,
 203         struct vattr    *vattr)
 204 {
 205         vnode_t         *vp = vn_from_inode(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 xfs_init_security(
 228         struct vnode    *vp,
 229         struct inode    *dir)
 230 {
 231         struct inode    *ip = vn_to_inode(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 xfs_has_fs_struct(struct task_struct *task)
 261 {
 262         return (task->fs != init_task.fs);
 263 }
 264
 265 STATIC inline void
 266 xfs_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          * xfs_init_security we must back out.
 278          * ENOSPC can hit here, among other things.
 279          */
 280         teardown.d_inode = vn_to_inode(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 xfs_vn_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 = { 0 };
 299         vnode_t         *vp = NULL, *dvp = vn_from_inode(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         if (unlikely(test_default_acl && test_default_acl(dvp))) {
 312                 if (!_ACL_ALLOC(default_acl)) {
 313                         return -ENOMEM;
 314                 }
 315                 if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
 316                         _ACL_FREE(default_acl);
 317                         default_acl = NULL;
 318                 }
 319         }
 320
 321         if (IS_POSIXACL(dir) && !default_acl && xfs_has_fs_struct(current))
 322                 mode &= ~current->fs->umask;
 323
 324         vattr.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 325         vattr.va_mode = mode;
 326
 327         switch (mode & S_IFMT) {
 328         case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
 329                 vattr.va_rdev = sysv_encode_dev(rdev);
 330                 vattr.va_mask |= XFS_AT_RDEV;
 331                 /*FALLTHROUGH*/
 332         case S_IFREG:
 333                 VOP_CREATE(dvp, dentry, &vattr, &vp, NULL, error);
 334                 break;
 335         case S_IFDIR:
 336                 VOP_MKDIR(dvp, dentry, &vattr, &vp, NULL, error);
 337                 break;
 338         default:
 339                 error = EINVAL;
 340                 break;
 341         }
 342
 343         if (unlikely(!error)) {
 344                 error = xfs_init_security(vp, dir);
 345                 if (error)
 346                         xfs_cleanup_inode(dvp, vp, dentry, mode);
 347         }
 348
 349         if (unlikely(default_acl)) {
 350                 if (!error) {
 351                         error = _ACL_INHERIT(vp, &vattr, default_acl);
 352                         if (!error)
 353                                 VMODIFY(vp);
 354                         else
 355                                 xfs_cleanup_inode(dvp, vp, dentry, mode);
 356                 }
 357                 _ACL_FREE(default_acl);
 358         }
 359
 360         if (likely(!error)) {
 361                 ASSERT(vp);
 362                 ip = vn_to_inode(vp);
 363
 364                 if (S_ISCHR(mode) || S_ISBLK(mode))
 365                         ip->i_rdev = rdev;
 366                 else if (S_ISDIR(mode))
 367                         xfs_validate_fields(ip, &vattr);
 368                 d_instantiate(dentry, ip);
 369                 xfs_validate_fields(dir, &vattr);
 370         }
 371         return -error;
 372 }
 373
 374 STATIC int
 375 xfs_vn_create(
 376         struct inode    *dir,
 377         struct dentry   *dentry,
 378         int             mode,
 379         struct nameidata *nd)
 380 {
 381         return xfs_vn_mknod(dir, dentry, mode, 0);
 382 }
 383
 384 STATIC int
 385 xfs_vn_mkdir(
 386         struct inode    *dir,
 387         struct dentry   *dentry,
 388         int             mode)
 389 {
 390         return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
 391 }
 392
 393 STATIC struct dentry *
 394 xfs_vn_lookup(
 395         struct inode    *dir,
 396         struct dentry   *dentry,
 397         struct nameidata *nd)
 398 {
 399         struct vnode    *vp = vn_from_inode(dir), *cvp;
 400         int             error;
 401
 402         if (dentry->d_name.len >= MAXNAMELEN)
 403                 return ERR_PTR(-ENAMETOOLONG);
 404
 405         VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
 406         if (error) {
 407                 if (unlikely(error != ENOENT))
 408                         return ERR_PTR(-error);
 409                 d_add(dentry, NULL);
 410                 return NULL;
 411         }
 412
 413         return d_splice_alias(vn_to_inode(cvp), dentry);
 414 }
 415
 416 STATIC int
 417 xfs_vn_link(
 418         struct dentry   *old_dentry,
 419         struct inode    *dir,
 420         struct dentry   *dentry)
 421 {
 422         struct inode    *ip;    /* inode of guy being linked to */
 423         vnode_t         *tdvp;  /* target directory for new name/link */
 424         vnode_t         *vp;    /* vp of name being linked */
 425         vattr_t         vattr;
 426         int             error;
 427
 428         ip = old_dentry->d_inode;       /* inode being linked to */
 429         if (S_ISDIR(ip->i_mode))
 430                 return -EPERM;
 431
 432         tdvp = vn_from_inode(dir);
 433         vp = vn_from_inode(ip);
 434
 435         VOP_LINK(tdvp, vp, dentry, NULL, error);
 436         if (likely(!error)) {
 437                 VMODIFY(tdvp);
 438                 VN_HOLD(vp);
 439                 xfs_validate_fields(ip, &vattr);
 440                 d_instantiate(dentry, ip);
 441         }
 442         return -error;
 443 }
 444
 445 STATIC int
 446 xfs_vn_unlink(
 447         struct inode    *dir,
 448         struct dentry   *dentry)
 449 {
 450         struct inode    *inode;
 451         vnode_t         *dvp;   /* directory containing name to remove */
 452         vattr_t         vattr;
 453         int             error;
 454
 455         inode = dentry->d_inode;
 456         dvp = vn_from_inode(dir);
 457
 458         VOP_REMOVE(dvp, dentry, NULL, error);
 459         if (likely(!error)) {
 460                 xfs_validate_fields(dir, &vattr);       /* size needs update */
 461                 xfs_validate_fields(inode, &vattr);
 462         }
 463         return -error;
 464 }
 465
 466 STATIC int
 467 xfs_vn_symlink(
 468         struct inode    *dir,
 469         struct dentry   *dentry,
 470         const char      *symname)
 471 {
 472         struct inode    *ip;
 473         vattr_t         vattr = { 0 };
 474         vnode_t         *dvp;   /* directory containing name of symlink */
 475         vnode_t         *cvp;   /* used to lookup symlink to put in dentry */
 476         int             error;
 477
 478         dvp = vn_from_inode(dir);
 479         cvp = NULL;
 480
 481         vattr.va_mode = S_IFLNK |
 482                 (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
 483         vattr.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 484
 485         error = 0;
 486         VOP_SYMLINK(dvp, dentry, &vattr, (char *)symname, &cvp, NULL, error);
 487         if (likely(!error && cvp)) {
 488                 error = xfs_init_security(cvp, dir);
 489                 if (likely(!error)) {
 490                         ip = vn_to_inode(cvp);
 491                         d_instantiate(dentry, ip);
 492                         xfs_validate_fields(dir, &vattr);
 493                         xfs_validate_fields(ip, &vattr);
 494                 }
 495         }
 496         return -error;
 497 }
 498
 499 STATIC int
 500 xfs_vn_rmdir(
 501         struct inode    *dir,
 502         struct dentry   *dentry)
 503 {
 504         struct inode    *inode = dentry->d_inode;
 505         vnode_t         *dvp = vn_from_inode(dir);
 506         vattr_t         vattr;
 507         int             error;
 508
 509         VOP_RMDIR(dvp, dentry, NULL, error);
 510         if (likely(!error)) {
 511                 xfs_validate_fields(inode, &vattr);
 512                 xfs_validate_fields(dir, &vattr);
 513         }
 514         return -error;
 515 }
 516
 517 STATIC int
 518 xfs_vn_rename(
 519         struct inode    *odir,
 520         struct dentry   *odentry,
 521         struct inode    *ndir,
 522         struct dentry   *ndentry)
 523 {
 524         struct inode    *new_inode = ndentry->d_inode;
 525         vnode_t         *fvp;   /* from directory */
 526         vnode_t         *tvp;   /* target directory */
 527         vattr_t         vattr;
 528         int             error;
 529
 530         fvp = vn_from_inode(odir);
 531         tvp = vn_from_inode(ndir);
 532
 533         VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
 534         if (likely(!error)) {
 535                 if (new_inode)
 536                         xfs_validate_fields(new_inode, &vattr);
 537                 xfs_validate_fields(odir, &vattr);
 538                 if (ndir != odir)
 539                         xfs_validate_fields(ndir, &vattr);
 540         }
 541         return -error;
 542 }
 543
 544 /*
 545  * careful here - this function can get called recursively, so
 546  * we need to be very careful about how much stack we use.
 547  * uio is kmalloced for this reason...
 548  */
 549 STATIC void *
 550 xfs_vn_follow_link(
 551         struct dentry           *dentry,
 552         struct nameidata        *nd)
 553 {
 554         vnode_t                 *vp;
 555         uio_t                   *uio;
 556         iovec_t                 iov;
 557         int                     error;
 558         char                    *link;
 559
 560         ASSERT(dentry);
 561         ASSERT(nd);
 562
 563         link = (char *)kmalloc(MAXPATHLEN+1, GFP_KERNEL);
 564         if (!link) {
 565                 nd_set_link(nd, ERR_PTR(-ENOMEM));
 566                 return NULL;
 567         }
 568
 569         uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
 570         if (!uio) {
 571                 kfree(link);
 572                 nd_set_link(nd, ERR_PTR(-ENOMEM));
 573                 return NULL;
 574         }
 575
 576         vp = vn_from_inode(dentry->d_inode);
 577
 578         iov.iov_base = link;
 579         iov.iov_len = MAXPATHLEN;
 580
 581         uio->uio_iov = &iov;
 582         uio->uio_offset = 0;
 583         uio->uio_segflg = UIO_SYSSPACE;
 584         uio->uio_resid = MAXPATHLEN;
 585         uio->uio_iovcnt = 1;
 586
 587         VOP_READLINK(vp, uio, 0, NULL, error);
 588         if (error) {
 589                 kfree(link);
 590                 link = ERR_PTR(-error);
 591         } else {
 592                 link[MAXPATHLEN - uio->uio_resid] = '\0';
 593         }
 594         kfree(uio);
 595
 596         nd_set_link(nd, link);
 597         return NULL;
 598 }
 599
 600 STATIC void
 601 xfs_vn_put_link(
 602         struct dentry   *dentry,
 603         struct nameidata *nd,
 604         void            *p)
 605 {
 606         char            *s = nd_get_link(nd);
 607
 608         if (!IS_ERR(s))
 609                 kfree(s);
 610 }
 611
 612 #ifdef CONFIG_XFS_POSIX_ACL
 613 STATIC int
 614 xfs_vn_permission(
 615         struct inode    *inode,
 616         int             mode,
 617         struct nameidata *nd)
 618 {
 619         vnode_t         *vp = vn_from_inode(inode);
 620         int             error;
 621
 622         mode <<= 6;             /* convert from linux to vnode access bits */
 623         VOP_ACCESS(vp, mode, NULL, error);
 624         return -error;
 625 }
 626 #else
 627 #define xfs_vn_permission NULL
 628 #endif
 629
 630 STATIC int
 631 xfs_vn_getattr(
 632         struct vfsmount *mnt,
 633         struct dentry   *dentry,
 634         struct kstat    *stat)
 635 {
 636         struct inode    *inode = dentry->d_inode;
 637         vnode_t         *vp = vn_from_inode(inode);
 638         int             error = 0;
 639
 640         if (unlikely(vp->v_flag & VMODIFIED))
 641                 error = vn_revalidate(vp);
 642         if (!error)
 643                 generic_fillattr(inode, stat);
 644         return 0;
 645 }
 646
 647 STATIC int
 648 xfs_vn_setattr(
 649         struct dentry   *dentry,
 650         struct iattr    *attr)
 651 {
 652         struct inode    *inode = dentry->d_inode;
 653         unsigned int    ia_valid = attr->ia_valid;
 654         vnode_t         *vp = vn_from_inode(inode);
 655         vattr_t         vattr = { 0 };
 656         int             flags = 0;
 657         int             error;
 658
 659         if (ia_valid & ATTR_UID) {
 660                 vattr.va_mask |= XFS_AT_UID;
 661                 vattr.va_uid = attr->ia_uid;
 662         }
 663         if (ia_valid & ATTR_GID) {
 664                 vattr.va_mask |= XFS_AT_GID;
 665                 vattr.va_gid = attr->ia_gid;
 666         }
 667         if (ia_valid & ATTR_SIZE) {
 668                 vattr.va_mask |= XFS_AT_SIZE;
 669                 vattr.va_size = attr->ia_size;
 670         }
 671         if (ia_valid & ATTR_ATIME) {
 672                 vattr.va_mask |= XFS_AT_ATIME;
 673                 vattr.va_atime = attr->ia_atime;
 674                 if (ia_valid & ATTR_ATIME_SET)
 675                         inode->i_atime = attr->ia_atime;
 676         }
 677         if (ia_valid & ATTR_MTIME) {
 678                 vattr.va_mask |= XFS_AT_MTIME;
 679                 vattr.va_mtime = attr->ia_mtime;
 680         }
 681         if (ia_valid & ATTR_CTIME) {
 682                 vattr.va_mask |= XFS_AT_CTIME;
 683                 vattr.va_ctime = attr->ia_ctime;
 684         }
 685         if (ia_valid & ATTR_MODE) {
 686                 vattr.va_mask |= XFS_AT_MODE;
 687                 vattr.va_mode = attr->ia_mode;
 688                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 689                         inode->i_mode &= ~S_ISGID;
 690         }
 691
 692         if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
 693                 flags |= ATTR_UTIME;
 694 #ifdef ATTR_NO_BLOCK
 695         if ((ia_valid & ATTR_NO_BLOCK))
 696                 flags |= ATTR_NONBLOCK;
 697 #endif
 698
 699         VOP_SETATTR(vp, &vattr, flags, NULL, error);
 700         if (likely(!error))
 701                 __vn_revalidate(vp, &vattr);
 702         return -error;
 703 }
 704
 705 STATIC void
 706 xfs_vn_truncate(
 707         struct inode    *inode)
 708 {
 709         block_truncate_page(inode->i_mapping, inode->i_size, xfs_get_block);
 710 }
 711
 712 STATIC int
 713 xfs_vn_setxattr(
 714         struct dentry   *dentry,
 715         const char      *name,
 716         const void      *data,
 717         size_t          size,
 718         int             flags)
 719 {
 720         vnode_t         *vp = vn_from_inode(dentry->d_inode);
 721         char            *attr = (char *)name;
 722         attrnames_t     *namesp;
 723         int             xflags = 0;
 724         int             error;
 725
 726         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 727         if (!namesp)
 728                 return -EOPNOTSUPP;
 729         attr += namesp->attr_namelen;
 730         error = namesp->attr_capable(vp, NULL);
 731         if (error)
 732                 return error;
 733
 734         /* Convert Linux syscall to XFS internal ATTR flags */
 735         if (flags & XATTR_CREATE)
 736                 xflags |= ATTR_CREATE;
 737         if (flags & XATTR_REPLACE)
 738                 xflags |= ATTR_REPLACE;
 739         xflags |= namesp->attr_flag;
 740         return namesp->attr_set(vp, attr, (void *)data, size, xflags);
 741 }
 742
 743 STATIC ssize_t
 744 xfs_vn_getxattr(
 745         struct dentry   *dentry,
 746         const char      *name,
 747         void            *data,
 748         size_t          size)
 749 {
 750         vnode_t         *vp = vn_from_inode(dentry->d_inode);
 751         char            *attr = (char *)name;
 752         attrnames_t     *namesp;
 753         int             xflags = 0;
 754         ssize_t         error;
 755
 756         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 757         if (!namesp)
 758                 return -EOPNOTSUPP;
 759         attr += namesp->attr_namelen;
 760         error = namesp->attr_capable(vp, NULL);
 761         if (error)
 762                 return error;
 763
 764         /* Convert Linux syscall to XFS internal ATTR flags */
 765         if (!size) {
 766                 xflags |= ATTR_KERNOVAL;
 767                 data = NULL;
 768         }
 769         xflags |= namesp->attr_flag;
 770         return namesp->attr_get(vp, attr, (void *)data, size, xflags);
 771 }
 772
 773 STATIC ssize_t
 774 xfs_vn_listxattr(
 775         struct dentry           *dentry,
 776         char                    *data,
 777         size_t                  size)
 778 {
 779         vnode_t                 *vp = vn_from_inode(dentry->d_inode);
 780         int                     error, xflags = ATTR_KERNAMELS;
 781         ssize_t                 result;
 782
 783         if (!size)
 784                 xflags |= ATTR_KERNOVAL;
 785         xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;
 786
 787         error = attr_generic_list(vp, data, size, xflags, &result);
 788         if (error < 0)
 789                 return error;
 790         return result;
 791 }
 792
 793 STATIC int
 794 xfs_vn_removexattr(
 795         struct dentry   *dentry,
 796         const char      *name)
 797 {
 798         vnode_t         *vp = vn_from_inode(dentry->d_inode);
 799         char            *attr = (char *)name;
 800         attrnames_t     *namesp;
 801         int             xflags = 0;
 802         int             error;
 803
 804         namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 805         if (!namesp)
 806                 return -EOPNOTSUPP;
 807         attr += namesp->attr_namelen;
 808         error = namesp->attr_capable(vp, NULL);
 809         if (error)
 810                 return error;
 811         xflags |= namesp->attr_flag;
 812         return namesp->attr_remove(vp, attr, xflags);
 813 }
 814
 815
 816 struct inode_operations xfs_inode_operations = {
 817         .permission             = xfs_vn_permission,
 818         .truncate               = xfs_vn_truncate,
 819         .getattr                = xfs_vn_getattr,
 820         .setattr                = xfs_vn_setattr,
 821         .setxattr               = xfs_vn_setxattr,
 822         .getxattr               = xfs_vn_getxattr,
 823         .listxattr              = xfs_vn_listxattr,
 824         .removexattr            = xfs_vn_removexattr,
 825 };
 826
 827 struct inode_operations xfs_dir_inode_operations = {
 828         .create                 = xfs_vn_create,
 829         .lookup                 = xfs_vn_lookup,
 830         .link                   = xfs_vn_link,
 831         .unlink                 = xfs_vn_unlink,
 832         .symlink                = xfs_vn_symlink,
 833         .mkdir                  = xfs_vn_mkdir,
 834         .rmdir                  = xfs_vn_rmdir,
 835         .mknod                  = xfs_vn_mknod,
 836         .rename                 = xfs_vn_rename,
 837         .permission             = xfs_vn_permission,
 838         .getattr                = xfs_vn_getattr,
 839         .setattr                = xfs_vn_setattr,
 840         .setxattr               = xfs_vn_setxattr,
 841         .getxattr               = xfs_vn_getxattr,
 842         .listxattr              = xfs_vn_listxattr,
 843         .removexattr            = xfs_vn_removexattr,
 844 };
 845
 846 struct inode_operations xfs_symlink_inode_operations = {
 847         .readlink               = generic_readlink,
 848         .follow_link            = xfs_vn_follow_link,
 849         .put_link               = xfs_vn_put_link,
 850         .permission             = xfs_vn_permission,
 851         .getattr                = xfs_vn_getattr,
 852         .setattr                = xfs_vn_setattr,
 853         .setxattr               = xfs_vn_setxattr,
 854         .getxattr               = xfs_vn_getxattr,
 855         .listxattr              = xfs_vn_listxattr,
 856         .removexattr            = xfs_vn_removexattr,
 857 };