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TOMOYO Linux Cross Reference
Linux/fs/afs/super.c

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  1 /* AFS superblock handling
  2  *
  3  * Copyright (c) 2002, 2007, 2018 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/fs_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 void afs_kill_super(struct super_block *sb);
 34 static struct inode *afs_alloc_inode(struct super_block *sb);
 35 static void afs_destroy_inode(struct inode *inode);
 36 static void afs_free_inode(struct inode *inode);
 37 static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
 38 static int afs_show_devname(struct seq_file *m, struct dentry *root);
 39 static int afs_show_options(struct seq_file *m, struct dentry *root);
 40 static int afs_init_fs_context(struct fs_context *fc);
 41 static const struct fs_parameter_description afs_fs_parameters;
 42 
 43 struct file_system_type afs_fs_type = {
 44         .owner                  = THIS_MODULE,
 45         .name                   = "afs",
 46         .init_fs_context        = afs_init_fs_context,
 47         .parameters             = &afs_fs_parameters,
 48         .kill_sb                = afs_kill_super,
 49         .fs_flags               = FS_RENAME_DOES_D_MOVE,
 50 };
 51 MODULE_ALIAS_FS("afs");
 52 
 53 int afs_net_id;
 54 
 55 static const struct super_operations afs_super_ops = {
 56         .statfs         = afs_statfs,
 57         .alloc_inode    = afs_alloc_inode,
 58         .drop_inode     = afs_drop_inode,
 59         .destroy_inode  = afs_destroy_inode,
 60         .free_inode     = afs_free_inode,
 61         .evict_inode    = afs_evict_inode,
 62         .show_devname   = afs_show_devname,
 63         .show_options   = afs_show_options,
 64 };
 65 
 66 static struct kmem_cache *afs_inode_cachep;
 67 static atomic_t afs_count_active_inodes;
 68 
 69 enum afs_param {
 70         Opt_autocell,
 71         Opt_dyn,
 72         Opt_flock,
 73         Opt_source,
 74 };
 75 
 76 static const struct fs_parameter_spec afs_param_specs[] = {
 77         fsparam_flag  ("autocell",      Opt_autocell),
 78         fsparam_flag  ("dyn",           Opt_dyn),
 79         fsparam_enum  ("flock",         Opt_flock),
 80         fsparam_string("source",        Opt_source),
 81         {}
 82 };
 83 
 84 static const struct fs_parameter_enum afs_param_enums[] = {
 85         { Opt_flock,    "local",        afs_flock_mode_local },
 86         { Opt_flock,    "openafs",      afs_flock_mode_openafs },
 87         { Opt_flock,    "strict",       afs_flock_mode_strict },
 88         { Opt_flock,    "write",        afs_flock_mode_write },
 89         {}
 90 };
 91 
 92 static const struct fs_parameter_description afs_fs_parameters = {
 93         .name           = "kAFS",
 94         .specs          = afs_param_specs,
 95         .enums          = afs_param_enums,
 96 };
 97 
 98 /*
 99  * initialise the filesystem
100  */
101 int __init afs_fs_init(void)
102 {
103         int ret;
104 
105         _enter("");
106 
107         /* create ourselves an inode cache */
108         atomic_set(&afs_count_active_inodes, 0);
109 
110         ret = -ENOMEM;
111         afs_inode_cachep = kmem_cache_create("afs_inode_cache",
112                                              sizeof(struct afs_vnode),
113                                              0,
114                                              SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
115                                              afs_i_init_once);
116         if (!afs_inode_cachep) {
117                 printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
118                 return ret;
119         }
120 
121         /* now export our filesystem to lesser mortals */
122         ret = register_filesystem(&afs_fs_type);
123         if (ret < 0) {
124                 kmem_cache_destroy(afs_inode_cachep);
125                 _leave(" = %d", ret);
126                 return ret;
127         }
128 
129         _leave(" = 0");
130         return 0;
131 }
132 
133 /*
134  * clean up the filesystem
135  */
136 void afs_fs_exit(void)
137 {
138         _enter("");
139 
140         afs_mntpt_kill_timer();
141         unregister_filesystem(&afs_fs_type);
142 
143         if (atomic_read(&afs_count_active_inodes) != 0) {
144                 printk("kAFS: %d active inode objects still present\n",
145                        atomic_read(&afs_count_active_inodes));
146                 BUG();
147         }
148 
149         /*
150          * Make sure all delayed rcu free inodes are flushed before we
151          * destroy cache.
152          */
153         rcu_barrier();
154         kmem_cache_destroy(afs_inode_cachep);
155         _leave("");
156 }
157 
158 /*
159  * Display the mount device name in /proc/mounts.
160  */
161 static int afs_show_devname(struct seq_file *m, struct dentry *root)
162 {
163         struct afs_super_info *as = AFS_FS_S(root->d_sb);
164         struct afs_volume *volume = as->volume;
165         struct afs_cell *cell = as->cell;
166         const char *suf = "";
167         char pref = '%';
168 
169         if (as->dyn_root) {
170                 seq_puts(m, "none");
171                 return 0;
172         }
173 
174         switch (volume->type) {
175         case AFSVL_RWVOL:
176                 break;
177         case AFSVL_ROVOL:
178                 pref = '#';
179                 if (volume->type_force)
180                         suf = ".readonly";
181                 break;
182         case AFSVL_BACKVOL:
183                 pref = '#';
184                 suf = ".backup";
185                 break;
186         }
187 
188         seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
189         return 0;
190 }
191 
192 /*
193  * Display the mount options in /proc/mounts.
194  */
195 static int afs_show_options(struct seq_file *m, struct dentry *root)
196 {
197         struct afs_super_info *as = AFS_FS_S(root->d_sb);
198         const char *p = NULL;
199 
200         if (as->dyn_root)
201                 seq_puts(m, ",dyn");
202         if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
203                 seq_puts(m, ",autocell");
204         switch (as->flock_mode) {
205         case afs_flock_mode_unset:      break;
206         case afs_flock_mode_local:      p = "local";    break;
207         case afs_flock_mode_openafs:    p = "openafs";  break;
208         case afs_flock_mode_strict:     p = "strict";   break;
209         case afs_flock_mode_write:      p = "write";    break;
210         }
211         if (p)
212                 seq_printf(m, ",flock=%s", p);
213 
214         return 0;
215 }
216 
217 /*
218  * Parse the source name to get cell name, volume name, volume type and R/W
219  * selector.
220  *
221  * This can be one of the following:
222  *      "%[cell:]volume[.]"             R/W volume
223  *      "#[cell:]volume[.]"             R/O or R/W volume (R/O parent),
224  *                                       or R/W (R/W parent) volume
225  *      "%[cell:]volume.readonly"       R/O volume
226  *      "#[cell:]volume.readonly"       R/O volume
227  *      "%[cell:]volume.backup"         Backup volume
228  *      "#[cell:]volume.backup"         Backup volume
229  */
230 static int afs_parse_source(struct fs_context *fc, struct fs_parameter *param)
231 {
232         struct afs_fs_context *ctx = fc->fs_private;
233         struct afs_cell *cell;
234         const char *cellname, *suffix, *name = param->string;
235         int cellnamesz;
236 
237         _enter(",%s", name);
238 
239         if (!name) {
240                 printk(KERN_ERR "kAFS: no volume name specified\n");
241                 return -EINVAL;
242         }
243 
244         if ((name[0] != '%' && name[0] != '#') || !name[1]) {
245                 /* To use dynroot, we don't want to have to provide a source */
246                 if (strcmp(name, "none") == 0) {
247                         ctx->no_cell = true;
248                         return 0;
249                 }
250                 printk(KERN_ERR "kAFS: unparsable volume name\n");
251                 return -EINVAL;
252         }
253 
254         /* determine the type of volume we're looking for */
255         if (name[0] == '%') {
256                 ctx->type = AFSVL_RWVOL;
257                 ctx->force = true;
258         }
259         name++;
260 
261         /* split the cell name out if there is one */
262         ctx->volname = strchr(name, ':');
263         if (ctx->volname) {
264                 cellname = name;
265                 cellnamesz = ctx->volname - name;
266                 ctx->volname++;
267         } else {
268                 ctx->volname = name;
269                 cellname = NULL;
270                 cellnamesz = 0;
271         }
272 
273         /* the volume type is further affected by a possible suffix */
274         suffix = strrchr(ctx->volname, '.');
275         if (suffix) {
276                 if (strcmp(suffix, ".readonly") == 0) {
277                         ctx->type = AFSVL_ROVOL;
278                         ctx->force = true;
279                 } else if (strcmp(suffix, ".backup") == 0) {
280                         ctx->type = AFSVL_BACKVOL;
281                         ctx->force = true;
282                 } else if (suffix[1] == 0) {
283                 } else {
284                         suffix = NULL;
285                 }
286         }
287 
288         ctx->volnamesz = suffix ?
289                 suffix - ctx->volname : strlen(ctx->volname);
290 
291         _debug("cell %*.*s [%p]",
292                cellnamesz, cellnamesz, cellname ?: "", ctx->cell);
293 
294         /* lookup the cell record */
295         if (cellname) {
296                 cell = afs_lookup_cell(ctx->net, cellname, cellnamesz,
297                                        NULL, false);
298                 if (IS_ERR(cell)) {
299                         pr_err("kAFS: unable to lookup cell '%*.*s'\n",
300                                cellnamesz, cellnamesz, cellname ?: "");
301                         return PTR_ERR(cell);
302                 }
303                 afs_put_cell(ctx->net, ctx->cell);
304                 ctx->cell = cell;
305         }
306 
307         _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
308                ctx->cell->name, ctx->cell,
309                ctx->volnamesz, ctx->volnamesz, ctx->volname,
310                suffix ?: "-", ctx->type, ctx->force ? " FORCE" : "");
311 
312         fc->source = param->string;
313         param->string = NULL;
314         return 0;
315 }
316 
317 /*
318  * Parse a single mount parameter.
319  */
320 static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param)
321 {
322         struct fs_parse_result result;
323         struct afs_fs_context *ctx = fc->fs_private;
324         int opt;
325 
326         opt = fs_parse(fc, &afs_fs_parameters, param, &result);
327         if (opt < 0)
328                 return opt;
329 
330         switch (opt) {
331         case Opt_source:
332                 return afs_parse_source(fc, param);
333 
334         case Opt_autocell:
335                 ctx->autocell = true;
336                 break;
337 
338         case Opt_dyn:
339                 ctx->dyn_root = true;
340                 break;
341 
342         case Opt_flock:
343                 ctx->flock_mode = result.uint_32;
344                 break;
345 
346         default:
347                 return -EINVAL;
348         }
349 
350         _leave(" = 0");
351         return 0;
352 }
353 
354 /*
355  * Validate the options, get the cell key and look up the volume.
356  */
357 static int afs_validate_fc(struct fs_context *fc)
358 {
359         struct afs_fs_context *ctx = fc->fs_private;
360         struct afs_volume *volume;
361         struct key *key;
362 
363         if (!ctx->dyn_root) {
364                 if (ctx->no_cell) {
365                         pr_warn("kAFS: Can only specify source 'none' with -o dyn\n");
366                         return -EINVAL;
367                 }
368 
369                 if (!ctx->cell) {
370                         pr_warn("kAFS: No cell specified\n");
371                         return -EDESTADDRREQ;
372                 }
373 
374                 /* We try to do the mount securely. */
375                 key = afs_request_key(ctx->cell);
376                 if (IS_ERR(key))
377                         return PTR_ERR(key);
378 
379                 ctx->key = key;
380 
381                 if (ctx->volume) {
382                         afs_put_volume(ctx->cell, ctx->volume);
383                         ctx->volume = NULL;
384                 }
385 
386                 volume = afs_create_volume(ctx);
387                 if (IS_ERR(volume))
388                         return PTR_ERR(volume);
389 
390                 ctx->volume = volume;
391         }
392 
393         return 0;
394 }
395 
396 /*
397  * check a superblock to see if it's the one we're looking for
398  */
399 static int afs_test_super(struct super_block *sb, struct fs_context *fc)
400 {
401         struct afs_fs_context *ctx = fc->fs_private;
402         struct afs_super_info *as = AFS_FS_S(sb);
403 
404         return (as->net_ns == fc->net_ns &&
405                 as->volume &&
406                 as->volume->vid == ctx->volume->vid &&
407                 !as->dyn_root);
408 }
409 
410 static int afs_dynroot_test_super(struct super_block *sb, struct fs_context *fc)
411 {
412         struct afs_super_info *as = AFS_FS_S(sb);
413 
414         return (as->net_ns == fc->net_ns &&
415                 as->dyn_root);
416 }
417 
418 static int afs_set_super(struct super_block *sb, struct fs_context *fc)
419 {
420         return set_anon_super(sb, NULL);
421 }
422 
423 /*
424  * fill in the superblock
425  */
426 static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
427 {
428         struct afs_super_info *as = AFS_FS_S(sb);
429         struct afs_iget_data iget_data;
430         struct inode *inode = NULL;
431         int ret;
432 
433         _enter("");
434 
435         /* fill in the superblock */
436         sb->s_blocksize         = PAGE_SIZE;
437         sb->s_blocksize_bits    = PAGE_SHIFT;
438         sb->s_magic             = AFS_FS_MAGIC;
439         sb->s_op                = &afs_super_ops;
440         if (!as->dyn_root)
441                 sb->s_xattr     = afs_xattr_handlers;
442         ret = super_setup_bdi(sb);
443         if (ret)
444                 return ret;
445         sb->s_bdi->ra_pages     = VM_READAHEAD_PAGES;
446 
447         /* allocate the root inode and dentry */
448         if (as->dyn_root) {
449                 inode = afs_iget_pseudo_dir(sb, true);
450                 sb->s_flags     |= SB_RDONLY;
451         } else {
452                 sprintf(sb->s_id, "%llu", as->volume->vid);
453                 afs_activate_volume(as->volume);
454                 iget_data.fid.vid       = as->volume->vid;
455                 iget_data.fid.vnode     = 1;
456                 iget_data.fid.vnode_hi  = 0;
457                 iget_data.fid.unique    = 1;
458                 iget_data.cb_v_break    = as->volume->cb_v_break;
459                 iget_data.cb_s_break    = 0;
460                 inode = afs_iget(sb, ctx->key, &iget_data, NULL, NULL, NULL);
461         }
462 
463         if (IS_ERR(inode))
464                 return PTR_ERR(inode);
465 
466         if (ctx->autocell || as->dyn_root)
467                 set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
468 
469         ret = -ENOMEM;
470         sb->s_root = d_make_root(inode);
471         if (!sb->s_root)
472                 goto error;
473 
474         if (as->dyn_root) {
475                 sb->s_d_op = &afs_dynroot_dentry_operations;
476                 ret = afs_dynroot_populate(sb);
477                 if (ret < 0)
478                         goto error;
479         } else {
480                 sb->s_d_op = &afs_fs_dentry_operations;
481         }
482 
483         _leave(" = 0");
484         return 0;
485 
486 error:
487         _leave(" = %d", ret);
488         return ret;
489 }
490 
491 static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc)
492 {
493         struct afs_fs_context *ctx = fc->fs_private;
494         struct afs_super_info *as;
495 
496         as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
497         if (as) {
498                 as->net_ns = get_net(fc->net_ns);
499                 as->flock_mode = ctx->flock_mode;
500                 if (ctx->dyn_root) {
501                         as->dyn_root = true;
502                 } else {
503                         as->cell = afs_get_cell(ctx->cell);
504                         as->volume = __afs_get_volume(ctx->volume);
505                 }
506         }
507         return as;
508 }
509 
510 static void afs_destroy_sbi(struct afs_super_info *as)
511 {
512         if (as) {
513                 afs_put_volume(as->cell, as->volume);
514                 afs_put_cell(afs_net(as->net_ns), as->cell);
515                 put_net(as->net_ns);
516                 kfree(as);
517         }
518 }
519 
520 static void afs_kill_super(struct super_block *sb)
521 {
522         struct afs_super_info *as = AFS_FS_S(sb);
523         struct afs_net *net = afs_net(as->net_ns);
524 
525         if (as->dyn_root)
526                 afs_dynroot_depopulate(sb);
527 
528         /* Clear the callback interests (which will do ilookup5) before
529          * deactivating the superblock.
530          */
531         if (as->volume)
532                 afs_clear_callback_interests(net, as->volume->servers);
533         kill_anon_super(sb);
534         if (as->volume)
535                 afs_deactivate_volume(as->volume);
536         afs_destroy_sbi(as);
537 }
538 
539 /*
540  * Get an AFS superblock and root directory.
541  */
542 static int afs_get_tree(struct fs_context *fc)
543 {
544         struct afs_fs_context *ctx = fc->fs_private;
545         struct super_block *sb;
546         struct afs_super_info *as;
547         int ret;
548 
549         ret = afs_validate_fc(fc);
550         if (ret)
551                 goto error;
552 
553         _enter("");
554 
555         /* allocate a superblock info record */
556         ret = -ENOMEM;
557         as = afs_alloc_sbi(fc);
558         if (!as)
559                 goto error;
560         fc->s_fs_info = as;
561 
562         /* allocate a deviceless superblock */
563         sb = sget_fc(fc,
564                      as->dyn_root ? afs_dynroot_test_super : afs_test_super,
565                      afs_set_super);
566         if (IS_ERR(sb)) {
567                 ret = PTR_ERR(sb);
568                 goto error;
569         }
570 
571         if (!sb->s_root) {
572                 /* initial superblock/root creation */
573                 _debug("create");
574                 ret = afs_fill_super(sb, ctx);
575                 if (ret < 0)
576                         goto error_sb;
577                 sb->s_flags |= SB_ACTIVE;
578         } else {
579                 _debug("reuse");
580                 ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
581         }
582 
583         fc->root = dget(sb->s_root);
584         trace_afs_get_tree(as->cell, as->volume);
585         _leave(" = 0 [%p]", sb);
586         return 0;
587 
588 error_sb:
589         deactivate_locked_super(sb);
590 error:
591         _leave(" = %d", ret);
592         return ret;
593 }
594 
595 static void afs_free_fc(struct fs_context *fc)
596 {
597         struct afs_fs_context *ctx = fc->fs_private;
598 
599         afs_destroy_sbi(fc->s_fs_info);
600         afs_put_volume(ctx->cell, ctx->volume);
601         afs_put_cell(ctx->net, ctx->cell);
602         key_put(ctx->key);
603         kfree(ctx);
604 }
605 
606 static const struct fs_context_operations afs_context_ops = {
607         .free           = afs_free_fc,
608         .parse_param    = afs_parse_param,
609         .get_tree       = afs_get_tree,
610 };
611 
612 /*
613  * Set up the filesystem mount context.
614  */
615 static int afs_init_fs_context(struct fs_context *fc)
616 {
617         struct afs_fs_context *ctx;
618         struct afs_cell *cell;
619 
620         ctx = kzalloc(sizeof(struct afs_fs_context), GFP_KERNEL);
621         if (!ctx)
622                 return -ENOMEM;
623 
624         ctx->type = AFSVL_ROVOL;
625         ctx->net = afs_net(fc->net_ns);
626 
627         /* Default to the workstation cell. */
628         rcu_read_lock();
629         cell = afs_lookup_cell_rcu(ctx->net, NULL, 0);
630         rcu_read_unlock();
631         if (IS_ERR(cell))
632                 cell = NULL;
633         ctx->cell = cell;
634 
635         fc->fs_private = ctx;
636         fc->ops = &afs_context_ops;
637         return 0;
638 }
639 
640 /*
641  * Initialise an inode cache slab element prior to any use.  Note that
642  * afs_alloc_inode() *must* reset anything that could incorrectly leak from one
643  * inode to another.
644  */
645 static void afs_i_init_once(void *_vnode)
646 {
647         struct afs_vnode *vnode = _vnode;
648 
649         memset(vnode, 0, sizeof(*vnode));
650         inode_init_once(&vnode->vfs_inode);
651         mutex_init(&vnode->io_lock);
652         init_rwsem(&vnode->validate_lock);
653         spin_lock_init(&vnode->wb_lock);
654         spin_lock_init(&vnode->lock);
655         INIT_LIST_HEAD(&vnode->wb_keys);
656         INIT_LIST_HEAD(&vnode->pending_locks);
657         INIT_LIST_HEAD(&vnode->granted_locks);
658         INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
659         seqlock_init(&vnode->cb_lock);
660 }
661 
662 /*
663  * allocate an AFS inode struct from our slab cache
664  */
665 static struct inode *afs_alloc_inode(struct super_block *sb)
666 {
667         struct afs_vnode *vnode;
668 
669         vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
670         if (!vnode)
671                 return NULL;
672 
673         atomic_inc(&afs_count_active_inodes);
674 
675         /* Reset anything that shouldn't leak from one inode to the next. */
676         memset(&vnode->fid, 0, sizeof(vnode->fid));
677         memset(&vnode->status, 0, sizeof(vnode->status));
678 
679         vnode->volume           = NULL;
680         vnode->lock_key         = NULL;
681         vnode->permit_cache     = NULL;
682         RCU_INIT_POINTER(vnode->cb_interest, NULL);
683 #ifdef CONFIG_AFS_FSCACHE
684         vnode->cache            = NULL;
685 #endif
686 
687         vnode->flags            = 1 << AFS_VNODE_UNSET;
688         vnode->lock_state       = AFS_VNODE_LOCK_NONE;
689 
690         init_rwsem(&vnode->rmdir_lock);
691 
692         _leave(" = %p", &vnode->vfs_inode);
693         return &vnode->vfs_inode;
694 }
695 
696 static void afs_free_inode(struct inode *inode)
697 {
698         kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
699 }
700 
701 /*
702  * destroy an AFS inode struct
703  */
704 static void afs_destroy_inode(struct inode *inode)
705 {
706         struct afs_vnode *vnode = AFS_FS_I(inode);
707 
708         _enter("%p{%llx:%llu}", inode, vnode->fid.vid, vnode->fid.vnode);
709 
710         _debug("DESTROY INODE %p", inode);
711 
712         ASSERTCMP(rcu_access_pointer(vnode->cb_interest), ==, NULL);
713 
714         atomic_dec(&afs_count_active_inodes);
715 }
716 
717 /*
718  * return information about an AFS volume
719  */
720 static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
721 {
722         struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
723         struct afs_fs_cursor fc;
724         struct afs_volume_status vs;
725         struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
726         struct key *key;
727         int ret;
728 
729         buf->f_type     = dentry->d_sb->s_magic;
730         buf->f_bsize    = AFS_BLOCK_SIZE;
731         buf->f_namelen  = AFSNAMEMAX - 1;
732 
733         if (as->dyn_root) {
734                 buf->f_blocks   = 1;
735                 buf->f_bavail   = 0;
736                 buf->f_bfree    = 0;
737                 return 0;
738         }
739 
740         key = afs_request_key(vnode->volume->cell);
741         if (IS_ERR(key))
742                 return PTR_ERR(key);
743 
744         ret = -ERESTARTSYS;
745         if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
746                 fc.flags |= AFS_FS_CURSOR_NO_VSLEEP;
747                 while (afs_select_fileserver(&fc)) {
748                         fc.cb_break = afs_calc_vnode_cb_break(vnode);
749                         afs_fs_get_volume_status(&fc, &vs);
750                 }
751 
752                 afs_check_for_remote_deletion(&fc, fc.vnode);
753                 ret = afs_end_vnode_operation(&fc);
754         }
755 
756         key_put(key);
757 
758         if (ret == 0) {
759                 if (vs.max_quota == 0)
760                         buf->f_blocks = vs.part_max_blocks;
761                 else
762                         buf->f_blocks = vs.max_quota;
763                 buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
764         }
765 
766         return ret;
767 }
768 

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