fs/afs/super.c

   1 /* AFS superblock handling
   2  *
   3  * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
   4  *
   5  * This software may be freely redistributed under the terms of the
   6  * GNU General Public License.
   7  *
   8  * You should have received a copy of the GNU General Public License
   9  * along with this program; if not, write to the Free Software
  10  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  11  *
  12  * Authors: David Howells <dhowells@redhat.com>
  13  *          David Woodhouse <dwmw2@infradead.org>
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/mount.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/fs.h>
  23 #include <linux/pagemap.h>
  24 #include <linux/parser.h>
  25 #include <linux/statfs.h>
  26 #include <linux/sched.h>
  27 #include <linux/nsproxy.h>
  28 #include <linux/magic.h>
  29 #include <net/net_namespace.h>
  30 #include "internal.h"
  31
  32 static void afs_i_init_once(void *foo);
  33 static struct dentry *afs_mount(struct file_system_type *fs_type,
  34                       int flags, const char *dev_name, void *data);
  35 static void afs_kill_super(struct super_block *sb);
  36 static struct inode *afs_alloc_inode(struct super_block *sb);
  37 static void afs_destroy_inode(struct inode *inode);
  38 static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
  39 static int afs_show_devname(struct seq_file *m, struct dentry *root);
  40 static int afs_show_options(struct seq_file *m, struct dentry *root);
  41
  42 struct file_system_type afs_fs_type = {
  43         .owner          = THIS_MODULE,
  44         .name           = "afs",
  45         .mount          = afs_mount,
  46         .kill_sb        = afs_kill_super,
  47         .fs_flags       = 0,
  48 };
  49 MODULE_ALIAS_FS("afs");
  50
  51 int afs_net_id;
  52
  53 static const struct super_operations afs_super_ops = {
  54         .statfs         = afs_statfs,
  55         .alloc_inode    = afs_alloc_inode,
  56         .drop_inode     = afs_drop_inode,
  57         .destroy_inode  = afs_destroy_inode,
  58         .evict_inode    = afs_evict_inode,
  59         .show_devname   = afs_show_devname,
  60         .show_options   = afs_show_options,
  61 };
  62
  63 static struct kmem_cache *afs_inode_cachep;
  64 static atomic_t afs_count_active_inodes;
  65
  66 enum {
  67         afs_no_opt,
  68         afs_opt_cell,
  69         afs_opt_dyn,
  70         afs_opt_rwpath,
  71         afs_opt_vol,
  72         afs_opt_autocell,
  73 };
  74
  75 static const match_table_t afs_options_list = {
  76         { afs_opt_cell,         "cell=%s"       },
  77         { afs_opt_dyn,          "dyn"           },
  78         { afs_opt_rwpath,       "rwpath"        },
  79         { afs_opt_vol,          "vol=%s"        },
  80         { afs_opt_autocell,     "autocell"      },
  81         { afs_no_opt,           NULL            },
  82 };
  83
  84 /*
  85  * initialise the filesystem
  86  */
  87 int __init afs_fs_init(void)
  88 {
  89         int ret;
  90
  91         _enter("");
  92
  93         /* create ourselves an inode cache */
  94         atomic_set(&afs_count_active_inodes, 0);
  95
  96         ret = -ENOMEM;
  97         afs_inode_cachep = kmem_cache_create("afs_inode_cache",
  98                                              sizeof(struct afs_vnode),
  99                                              0,
 100                                              SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
 101                                              afs_i_init_once);
 102         if (!afs_inode_cachep) {
 103                 printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
 104                 return ret;
 105         }
 106
 107         /* now export our filesystem to lesser mortals */
 108         ret = register_filesystem(&afs_fs_type);
 109         if (ret < 0) {
 110                 kmem_cache_destroy(afs_inode_cachep);
 111                 _leave(" = %d", ret);
 112                 return ret;
 113         }
 114
 115         _leave(" = 0");
 116         return 0;
 117 }
 118
 119 /*
 120  * clean up the filesystem
 121  */
 122 void afs_fs_exit(void)
 123 {
 124         _enter("");
 125
 126         afs_mntpt_kill_timer();
 127         unregister_filesystem(&afs_fs_type);
 128
 129         if (atomic_read(&afs_count_active_inodes) != 0) {
 130                 printk("kAFS: %d active inode objects still present\n",
 131                        atomic_read(&afs_count_active_inodes));
 132                 BUG();
 133         }
 134
 135         /*
 136          * Make sure all delayed rcu free inodes are flushed before we
 137          * destroy cache.
 138          */
 139         rcu_barrier();
 140         kmem_cache_destroy(afs_inode_cachep);
 141         _leave("");
 142 }
 143
 144 /*
 145  * Display the mount device name in /proc/mounts.
 146  */
 147 static int afs_show_devname(struct seq_file *m, struct dentry *root)
 148 {
 149         struct afs_super_info *as = AFS_FS_S(root->d_sb);
 150         struct afs_volume *volume = as->volume;
 151         struct afs_cell *cell = as->cell;
 152         const char *suf = "";
 153         char pref = '%';
 154
 155         if (as->dyn_root) {
 156                 seq_puts(m, "none");
 157                 return 0;
 158         }
 159
 160         switch (volume->type) {
 161         case AFSVL_RWVOL:
 162                 break;
 163         case AFSVL_ROVOL:
 164                 pref = '#';
 165                 if (volume->type_force)
 166                         suf = ".readonly";
 167                 break;
 168         case AFSVL_BACKVOL:
 169                 pref = '#';
 170                 suf = ".backup";
 171                 break;
 172         }
 173
 174         seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
 175         return 0;
 176 }
 177
 178 /*
 179  * Display the mount options in /proc/mounts.
 180  */
 181 static int afs_show_options(struct seq_file *m, struct dentry *root)
 182 {
 183         struct afs_super_info *as = AFS_FS_S(root->d_sb);
 184
 185         if (as->dyn_root)
 186                 seq_puts(m, ",dyn");
 187         if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
 188                 seq_puts(m, ",autocell");
 189         return 0;
 190 }
 191
 192 /*
 193  * parse the mount options
 194  * - this function has been shamelessly adapted from the ext3 fs which
 195  *   shamelessly adapted it from the msdos fs
 196  */
 197 static int afs_parse_options(struct afs_mount_params *params,
 198                              char *options, const char **devname)
 199 {
 200         struct afs_cell *cell;
 201         substring_t args[MAX_OPT_ARGS];
 202         char *p;
 203         int token;
 204
 205         _enter("%s", options);
 206
 207         options[PAGE_SIZE - 1] = 0;
 208
 209         while ((p = strsep(&options, ","))) {
 210                 if (!*p)
 211                         continue;
 212
 213                 token = match_token(p, afs_options_list, args);
 214                 switch (token) {
 215                 case afs_opt_cell:
 216                         rcu_read_lock();
 217                         cell = afs_lookup_cell_rcu(params->net,
 218                                                    args[0].from,
 219                                                    args[0].to - args[0].from);
 220                         rcu_read_unlock();
 221                         if (IS_ERR(cell))
 222                                 return PTR_ERR(cell);
 223                         afs_put_cell(params->net, params->cell);
 224                         params->cell = cell;
 225                         break;
 226
 227                 case afs_opt_rwpath:
 228                         params->rwpath = true;
 229                         break;
 230
 231                 case afs_opt_vol:
 232                         *devname = args[0].from;
 233                         break;
 234
 235                 case afs_opt_autocell:
 236                         params->autocell = true;
 237                         break;
 238
 239                 case afs_opt_dyn:
 240                         params->dyn_root = true;
 241                         break;
 242
 243                 default:
 244                         printk(KERN_ERR "kAFS:"
 245                                " Unknown or invalid mount option: '%s'\n", p);
 246                         return -EINVAL;
 247                 }
 248         }
 249
 250         _leave(" = 0");
 251         return 0;
 252 }
 253
 254 /*
 255  * parse a device name to get cell name, volume name, volume type and R/W
 256  * selector
 257  * - this can be one of the following:
 258  *      "%[cell:]volume[.]"             R/W volume
 259  *      "#[cell:]volume[.]"             R/O or R/W volume (rwpath=0),
 260  *                                       or R/W (rwpath=1) volume
 261  *      "%[cell:]volume.readonly"       R/O volume
 262  *      "#[cell:]volume.readonly"       R/O volume
 263  *      "%[cell:]volume.backup"         Backup volume
 264  *      "#[cell:]volume.backup"         Backup volume
 265  */
 266 static int afs_parse_device_name(struct afs_mount_params *params,
 267                                  const char *name)
 268 {
 269         struct afs_cell *cell;
 270         const char *cellname, *suffix;
 271         int cellnamesz;
 272
 273         _enter(",%s", name);
 274
 275         if (!name) {
 276                 printk(KERN_ERR "kAFS: no volume name specified\n");
 277                 return -EINVAL;
 278         }
 279
 280         if ((name[0] != '%' && name[0] != '#') || !name[1]) {
 281                 printk(KERN_ERR "kAFS: unparsable volume name\n");
 282                 return -EINVAL;
 283         }
 284
 285         /* determine the type of volume we're looking for */
 286         params->type = AFSVL_ROVOL;
 287         params->force = false;
 288         if (params->rwpath || name[0] == '%') {
 289                 params->type = AFSVL_RWVOL;
 290                 params->force = true;
 291         }
 292         name++;
 293
 294         /* split the cell name out if there is one */
 295         params->volname = strchr(name, ':');
 296         if (params->volname) {
 297                 cellname = name;
 298                 cellnamesz = params->volname - name;
 299                 params->volname++;
 300         } else {
 301                 params->volname = name;
 302                 cellname = NULL;
 303                 cellnamesz = 0;
 304         }
 305
 306         /* the volume type is further affected by a possible suffix */
 307         suffix = strrchr(params->volname, '.');
 308         if (suffix) {
 309                 if (strcmp(suffix, ".readonly") == 0) {
 310                         params->type = AFSVL_ROVOL;
 311                         params->force = true;
 312                 } else if (strcmp(suffix, ".backup") == 0) {
 313                         params->type = AFSVL_BACKVOL;
 314                         params->force = true;
 315                 } else if (suffix[1] == 0) {
 316                 } else {
 317                         suffix = NULL;
 318                 }
 319         }
 320
 321         params->volnamesz = suffix ?
 322                 suffix - params->volname : strlen(params->volname);
 323
 324         _debug("cell %*.*s [%p]",
 325                cellnamesz, cellnamesz, cellname ?: "", params->cell);
 326
 327         /* lookup the cell record */
 328         if (cellname || !params->cell) {
 329                 cell = afs_lookup_cell(params->net, cellname, cellnamesz,
 330                                        NULL, false);
 331                 if (IS_ERR(cell)) {
 332                         printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n",
 333                                cellnamesz, cellnamesz, cellname ?: "");
 334                         return PTR_ERR(cell);
 335                 }
 336                 afs_put_cell(params->net, params->cell);
 337                 params->cell = cell;
 338         }
 339
 340         _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
 341                params->cell->name, params->cell,
 342                params->volnamesz, params->volnamesz, params->volname,
 343                suffix ?: "-", params->type, params->force ? " FORCE" : "");
 344
 345         return 0;
 346 }
 347
 348 /*
 349  * check a superblock to see if it's the one we're looking for
 350  */
 351 static int afs_test_super(struct super_block *sb, void *data)
 352 {
 353         struct afs_super_info *as1 = data;
 354         struct afs_super_info *as = AFS_FS_S(sb);
 355
 356         return (as->net_ns == as1->net_ns &&
 357                 as->volume &&
 358                 as->volume->vid == as1->volume->vid &&
 359                 !as->dyn_root);
 360 }
 361
 362 static int afs_dynroot_test_super(struct super_block *sb, void *data)
 363 {
 364         struct afs_super_info *as1 = data;
 365         struct afs_super_info *as = AFS_FS_S(sb);
 366
 367         return (as->net_ns == as1->net_ns &&
 368                 as->dyn_root);
 369 }
 370
 371 static int afs_set_super(struct super_block *sb, void *data)
 372 {
 373         struct afs_super_info *as = data;
 374
 375         sb->s_fs_info = as;
 376         return set_anon_super(sb, NULL);
 377 }
 378
 379 /*
 380  * fill in the superblock
 381  */
 382 static int afs_fill_super(struct super_block *sb,
 383                           struct afs_mount_params *params)
 384 {
 385         struct afs_super_info *as = AFS_FS_S(sb);
 386         struct afs_fid fid;
 387         struct inode *inode = NULL;
 388         int ret;
 389
 390         _enter("");
 391
 392         /* fill in the superblock */
 393         sb->s_blocksize         = PAGE_SIZE;
 394         sb->s_blocksize_bits    = PAGE_SHIFT;
 395         sb->s_magic             = AFS_FS_MAGIC;
 396         sb->s_op                = &afs_super_ops;
 397         if (!as->dyn_root)
 398                 sb->s_xattr     = afs_xattr_handlers;
 399         ret = super_setup_bdi(sb);
 400         if (ret)
 401                 return ret;
 402         sb->s_bdi->ra_pages     = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
 403
 404         /* allocate the root inode and dentry */
 405         if (as->dyn_root) {
 406                 inode = afs_iget_pseudo_dir(sb, true);
 407                 sb->s_flags     |= SB_RDONLY;
 408         } else {
 409                 sprintf(sb->s_id, "%u", as->volume->vid);
 410                 afs_activate_volume(as->volume);
 411                 fid.vid         = as->volume->vid;
 412                 fid.vnode       = 1;
 413                 fid.unique      = 1;
 414                 inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
 415         }
 416
 417         if (IS_ERR(inode))
 418                 return PTR_ERR(inode);
 419
 420         if (params->autocell || params->dyn_root)
 421                 set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
 422
 423         ret = -ENOMEM;
 424         sb->s_root = d_make_root(inode);
 425         if (!sb->s_root)
 426                 goto error;
 427
 428         if (as->dyn_root) {
 429                 sb->s_d_op = &afs_dynroot_dentry_operations;
 430                 ret = afs_dynroot_populate(sb);
 431                 if (ret < 0)
 432                         goto error;
 433         } else {
 434                 sb->s_d_op = &afs_fs_dentry_operations;
 435         }
 436
 437         _leave(" = 0");
 438         return 0;
 439
 440 error:
 441         _leave(" = %d", ret);
 442         return ret;
 443 }
 444
 445 static struct afs_super_info *afs_alloc_sbi(struct afs_mount_params *params)
 446 {
 447         struct afs_super_info *as;
 448
 449         as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
 450         if (as) {
 451                 as->net_ns = get_net(params->net_ns);
 452                 if (params->dyn_root)
 453                         as->dyn_root = true;
 454                 else
 455                         as->cell = afs_get_cell(params->cell);
 456         }
 457         return as;
 458 }
 459
 460 static void afs_destroy_sbi(struct afs_super_info *as)
 461 {
 462         if (as) {
 463                 afs_put_volume(as->cell, as->volume);
 464                 afs_put_cell(afs_net(as->net_ns), as->cell);
 465                 put_net(as->net_ns);
 466                 kfree(as);
 467         }
 468 }
 469
 470 static void afs_kill_super(struct super_block *sb)
 471 {
 472         struct afs_super_info *as = AFS_FS_S(sb);
 473         struct afs_net *net = afs_net(as->net_ns);
 474
 475         if (as->dyn_root)
 476                 afs_dynroot_depopulate(sb);
 477
 478         /* Clear the callback interests (which will do ilookup5) before
 479          * deactivating the superblock.
 480          */
 481         if (as->volume)
 482                 afs_clear_callback_interests(net, as->volume->servers);
 483         kill_anon_super(sb);
 484         if (as->volume)
 485                 afs_deactivate_volume(as->volume);
 486         afs_destroy_sbi(as);
 487 }
 488
 489 /*
 490  * get an AFS superblock
 491  */
 492 static struct dentry *afs_mount(struct file_system_type *fs_type,
 493                                 int flags, const char *dev_name, void *options)
 494 {
 495         struct afs_mount_params params;
 496         struct super_block *sb;
 497         struct afs_volume *candidate;
 498         struct key *key;
 499         struct afs_super_info *as;
 500         int ret;
 501
 502         _enter(",,%s,%p", dev_name, options);
 503
 504         memset(&params, 0, sizeof(params));
 505
 506         ret = -EINVAL;
 507         if (current->nsproxy->net_ns != &init_net)
 508                 goto error;
 509         params.net_ns = current->nsproxy->net_ns;
 510         params.net = afs_net(params.net_ns);
 511
 512         /* parse the options and device name */
 513         if (options) {
 514                 ret = afs_parse_options(&params, options, &dev_name);
 515                 if (ret < 0)
 516                         goto error;
 517         }
 518
 519         if (!params.dyn_root) {
 520                 ret = afs_parse_device_name(&params, dev_name);
 521                 if (ret < 0)
 522                         goto error;
 523
 524                 /* try and do the mount securely */
 525                 key = afs_request_key(params.cell);
 526                 if (IS_ERR(key)) {
 527                         _leave(" = %ld [key]", PTR_ERR(key));
 528                         ret = PTR_ERR(key);
 529                         goto error;
 530                 }
 531                 params.key = key;
 532         }
 533
 534         /* allocate a superblock info record */
 535         ret = -ENOMEM;
 536         as = afs_alloc_sbi(&params);
 537         if (!as)
 538                 goto error_key;
 539
 540         if (!params.dyn_root) {
 541                 /* Assume we're going to need a volume record; at the very
 542                  * least we can use it to update the volume record if we have
 543                  * one already.  This checks that the volume exists within the
 544                  * cell.
 545                  */
 546                 candidate = afs_create_volume(&params);
 547                 if (IS_ERR(candidate)) {
 548                         ret = PTR_ERR(candidate);
 549                         goto error_as;
 550                 }
 551
 552                 as->volume = candidate;
 553         }
 554
 555         /* allocate a deviceless superblock */
 556         sb = sget(fs_type,
 557                   as->dyn_root ? afs_dynroot_test_super : afs_test_super,
 558                   afs_set_super, flags, as);
 559         if (IS_ERR(sb)) {
 560                 ret = PTR_ERR(sb);
 561                 goto error_as;
 562         }
 563
 564         if (!sb->s_root) {
 565                 /* initial superblock/root creation */
 566                 _debug("create");
 567                 ret = afs_fill_super(sb, &params);
 568                 if (ret < 0)
 569                         goto error_sb;
 570                 as = NULL;
 571                 sb->s_flags |= SB_ACTIVE;
 572         } else {
 573                 _debug("reuse");
 574                 ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
 575                 afs_destroy_sbi(as);
 576                 as = NULL;
 577         }
 578
 579         afs_put_cell(params.net, params.cell);
 580         key_put(params.key);
 581         _leave(" = 0 [%p]", sb);
 582         return dget(sb->s_root);
 583
 584 error_sb:
 585         deactivate_locked_super(sb);
 586         goto error_key;
 587 error_as:
 588         afs_destroy_sbi(as);
 589 error_key:
 590         key_put(params.key);
 591 error:
 592         afs_put_cell(params.net, params.cell);
 593         _leave(" = %d", ret);
 594         return ERR_PTR(ret);
 595 }
 596
 597 /*
 598  * Initialise an inode cache slab element prior to any use.  Note that
 599  * afs_alloc_inode() *must* reset anything that could incorrectly leak from one
 600  * inode to another.
 601  */
 602 static void afs_i_init_once(void *_vnode)
 603 {
 604         struct afs_vnode *vnode = _vnode;
 605
 606         memset(vnode, 0, sizeof(*vnode));
 607         inode_init_once(&vnode->vfs_inode);
 608         mutex_init(&vnode->io_lock);
 609         init_rwsem(&vnode->validate_lock);
 610         spin_lock_init(&vnode->wb_lock);
 611         spin_lock_init(&vnode->lock);
 612         INIT_LIST_HEAD(&vnode->wb_keys);
 613         INIT_LIST_HEAD(&vnode->pending_locks);
 614         INIT_LIST_HEAD(&vnode->granted_locks);
 615         INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
 616         seqlock_init(&vnode->cb_lock);
 617 }
 618
 619 /*
 620  * allocate an AFS inode struct from our slab cache
 621  */
 622 static struct inode *afs_alloc_inode(struct super_block *sb)
 623 {
 624         struct afs_vnode *vnode;
 625
 626         vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
 627         if (!vnode)
 628                 return NULL;
 629
 630         atomic_inc(&afs_count_active_inodes);
 631
 632         /* Reset anything that shouldn't leak from one inode to the next. */
 633         memset(&vnode->fid, 0, sizeof(vnode->fid));
 634         memset(&vnode->status, 0, sizeof(vnode->status));
 635
 636         vnode->volume           = NULL;
 637         vnode->lock_key         = NULL;
 638         vnode->permit_cache     = NULL;
 639         vnode->cb_interest      = NULL;
 640 #ifdef CONFIG_AFS_FSCACHE
 641         vnode->cache            = NULL;
 642 #endif
 643
 644         vnode->flags            = 1 << AFS_VNODE_UNSET;
 645         vnode->cb_type          = 0;
 646         vnode->lock_state       = AFS_VNODE_LOCK_NONE;
 647
 648         _leave(" = %p", &vnode->vfs_inode);
 649         return &vnode->vfs_inode;
 650 }
 651
 652 static void afs_i_callback(struct rcu_head *head)
 653 {
 654         struct inode *inode = container_of(head, struct inode, i_rcu);
 655         struct afs_vnode *vnode = AFS_FS_I(inode);
 656         kmem_cache_free(afs_inode_cachep, vnode);
 657 }
 658
 659 /*
 660  * destroy an AFS inode struct
 661  */
 662 static void afs_destroy_inode(struct inode *inode)
 663 {
 664         struct afs_vnode *vnode = AFS_FS_I(inode);
 665
 666         _enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);
 667
 668         _debug("DESTROY INODE %p", inode);
 669
 670         ASSERTCMP(vnode->cb_interest, ==, NULL);
 671
 672         call_rcu(&inode->i_rcu, afs_i_callback);
 673         atomic_dec(&afs_count_active_inodes);
 674 }
 675
 676 /*
 677  * return information about an AFS volume
 678  */
 679 static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
 680 {
 681         struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
 682         struct afs_fs_cursor fc;
 683         struct afs_volume_status vs;
 684         struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
 685         struct key *key;
 686         int ret;
 687
 688         buf->f_type     = dentry->d_sb->s_magic;
 689         buf->f_bsize    = AFS_BLOCK_SIZE;
 690         buf->f_namelen  = AFSNAMEMAX - 1;
 691
 692         if (as->dyn_root) {
 693                 buf->f_blocks   = 1;
 694                 buf->f_bavail   = 0;
 695                 buf->f_bfree    = 0;
 696                 return 0;
 697         }
 698
 699         key = afs_request_key(vnode->volume->cell);
 700         if (IS_ERR(key))
 701                 return PTR_ERR(key);
 702
 703         ret = -ERESTARTSYS;
 704         if (afs_begin_vnode_operation(&fc, vnode, key)) {
 705                 fc.flags |= AFS_FS_CURSOR_NO_VSLEEP;
 706                 while (afs_select_fileserver(&fc)) {
 707                         fc.cb_break = afs_calc_vnode_cb_break(vnode);
 708                         afs_fs_get_volume_status(&fc, &vs);
 709                 }
 710
 711                 afs_check_for_remote_deletion(&fc, fc.vnode);
 712                 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
 713                 ret = afs_end_vnode_operation(&fc);
 714         }
 715
 716         key_put(key);
 717
 718         if (ret == 0) {
 719                 if (vs.max_quota == 0)
 720                         buf->f_blocks = vs.part_max_blocks;
 721                 else
 722                         buf->f_blocks = vs.max_quota;
 723                 buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
 724         }
 725
 726         return ret;
 727 }