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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 <[email protected]>
13 * David Woodhouse <[email protected]>
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
32static void afs_i_init_once(void *foo);
33static void afs_kill_super(struct super_block *sb);
34static struct inode *afs_alloc_inode(struct super_block *sb);
35static void afs_destroy_inode(struct inode *inode);
36static void afs_free_inode(struct inode *inode);
37static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
38static int afs_show_devname(struct seq_file *m, struct dentry *root);
39static int afs_show_options(struct seq_file *m, struct dentry *root);
40static int afs_init_fs_context(struct fs_context *fc);
41static const struct fs_parameter_spec afs_fs_parameters[];
42
43struct 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};
51MODULE_ALIAS_FS("afs");
52
53int afs_net_id;
54
55static const struct super_operations afs_super_ops = {
56 .statfs = afs_statfs,
57 .alloc_inode = afs_alloc_inode,
58 .write_inode = netfs_unpin_writeback,
59 .drop_inode = afs_drop_inode,
60 .destroy_inode = afs_destroy_inode,
61 .free_inode = afs_free_inode,
62 .evict_inode = afs_evict_inode,
63 .show_devname = afs_show_devname,
64 .show_options = afs_show_options,
65};
66
67static struct kmem_cache *afs_inode_cachep;
68static atomic_t afs_count_active_inodes;
69
70enum afs_param {
71 Opt_autocell,
72 Opt_dyn,
73 Opt_flock,
74 Opt_source,
75};
76
77static const struct constant_table afs_param_flock[] = {
78 {"local", afs_flock_mode_local },
79 {"openafs", afs_flock_mode_openafs },
80 {"strict", afs_flock_mode_strict },
81 {"write", afs_flock_mode_write },
82 {}
83};
84
85static const struct fs_parameter_spec afs_fs_parameters[] = {
86 fsparam_flag ("autocell", Opt_autocell),
87 fsparam_flag ("dyn", Opt_dyn),
88 fsparam_enum ("flock", Opt_flock, afs_param_flock),
89 fsparam_string("source", Opt_source),
90 {}
91};
92
93/*
94 * initialise the filesystem
95 */
96int __init afs_fs_init(void)
97{
98 int ret;
99
100 _enter("");
101
102 /* create ourselves an inode cache */
103 atomic_set(&afs_count_active_inodes, 0);
104
105 ret = -ENOMEM;
106 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
107 sizeof(struct afs_vnode),
108 0,
109 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
110 afs_i_init_once);
111 if (!afs_inode_cachep) {
112 printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
113 return ret;
114 }
115
116 /* now export our filesystem to lesser mortals */
117 ret = register_filesystem(&afs_fs_type);
118 if (ret < 0) {
119 kmem_cache_destroy(afs_inode_cachep);
120 _leave(" = %d", ret);
121 return ret;
122 }
123
124 _leave(" = 0");
125 return 0;
126}
127
128/*
129 * clean up the filesystem
130 */
131void afs_fs_exit(void)
132{
133 _enter("");
134
135 afs_mntpt_kill_timer();
136 unregister_filesystem(&afs_fs_type);
137
138 if (atomic_read(&afs_count_active_inodes) != 0) {
139 printk("kAFS: %d active inode objects still present\n",
140 atomic_read(&afs_count_active_inodes));
141 BUG();
142 }
143
144 /*
145 * Make sure all delayed rcu free inodes are flushed before we
146 * destroy cache.
147 */
148 rcu_barrier();
149 kmem_cache_destroy(afs_inode_cachep);
150 _leave("");
151}
152
153/*
154 * Display the mount device name in /proc/mounts.
155 */
156static int afs_show_devname(struct seq_file *m, struct dentry *root)
157{
158 struct afs_super_info *as = AFS_FS_S(root->d_sb);
159 struct afs_volume *volume = as->volume;
160 struct afs_cell *cell = as->cell;
161 const char *suf = "";
162 char pref = '%';
163
164 if (as->dyn_root) {
165 seq_puts(m, "none");
166 return 0;
167 }
168
169 switch (volume->type) {
170 case AFSVL_RWVOL:
171 break;
172 case AFSVL_ROVOL:
173 pref = '#';
174 if (volume->type_force)
175 suf = ".readonly";
176 break;
177 case AFSVL_BACKVOL:
178 pref = '#';
179 suf = ".backup";
180 break;
181 }
182
183 seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
184 return 0;
185}
186
187/*
188 * Display the mount options in /proc/mounts.
189 */
190static int afs_show_options(struct seq_file *m, struct dentry *root)
191{
192 struct afs_super_info *as = AFS_FS_S(root->d_sb);
193 const char *p = NULL;
194
195 if (as->dyn_root)
196 seq_puts(m, ",dyn");
197 switch (as->flock_mode) {
198 case afs_flock_mode_unset: break;
199 case afs_flock_mode_local: p = "local"; break;
200 case afs_flock_mode_openafs: p = "openafs"; break;
201 case afs_flock_mode_strict: p = "strict"; break;
202 case afs_flock_mode_write: p = "write"; break;
203 }
204 if (p)
205 seq_printf(m, ",flock=%s", p);
206
207 return 0;
208}
209
210/*
211 * Parse the source name to get cell name, volume name, volume type and R/W
212 * selector.
213 *
214 * This can be one of the following:
215 * "%[cell:]volume[.]" R/W volume
216 * "#[cell:]volume[.]" R/O or R/W volume (R/O parent),
217 * or R/W (R/W parent) volume
218 * "%[cell:]volume.readonly" R/O volume
219 * "#[cell:]volume.readonly" R/O volume
220 * "%[cell:]volume.backup" Backup volume
221 * "#[cell:]volume.backup" Backup volume
222 */
223static int afs_parse_source(struct fs_context *fc, struct fs_parameter *param)
224{
225 struct afs_fs_context *ctx = fc->fs_private;
226 struct afs_cell *cell;
227 const char *cellname, *suffix, *name = param->string;
228 int cellnamesz;
229
230 _enter(",%s", name);
231
232 if (fc->source)
233 return invalf(fc, "kAFS: Multiple sources not supported");
234
235 if (!name) {
236 printk(KERN_ERR "kAFS: no volume name specified\n");
237 return -EINVAL;
238 }
239
240 if ((name[0] != '%' && name[0] != '#') || !name[1]) {
241 /* To use dynroot, we don't want to have to provide a source */
242 if (strcmp(name, "none") == 0) {
243 ctx->no_cell = true;
244 return 0;
245 }
246 printk(KERN_ERR "kAFS: unparsable volume name\n");
247 return -EINVAL;
248 }
249
250 /* determine the type of volume we're looking for */
251 if (name[0] == '%') {
252 ctx->type = AFSVL_RWVOL;
253 ctx->force = true;
254 }
255 name++;
256
257 /* split the cell name out if there is one */
258 ctx->volname = strchr(name, ':');
259 if (ctx->volname) {
260 cellname = name;
261 cellnamesz = ctx->volname - name;
262 ctx->volname++;
263 } else {
264 ctx->volname = name;
265 cellname = NULL;
266 cellnamesz = 0;
267 }
268
269 /* the volume type is further affected by a possible suffix */
270 suffix = strrchr(ctx->volname, '.');
271 if (suffix) {
272 if (strcmp(suffix, ".readonly") == 0) {
273 ctx->type = AFSVL_ROVOL;
274 ctx->force = true;
275 } else if (strcmp(suffix, ".backup") == 0) {
276 ctx->type = AFSVL_BACKVOL;
277 ctx->force = true;
278 } else if (suffix[1] == 0) {
279 } else {
280 suffix = NULL;
281 }
282 }
283
284 ctx->volnamesz = suffix ?
285 suffix - ctx->volname : strlen(ctx->volname);
286
287 _debug("cell %*.*s [%p]",
288 cellnamesz, cellnamesz, cellname ?: "", ctx->cell);
289
290 /* lookup the cell record */
291 if (cellname) {
292 cell = afs_lookup_cell(ctx->net, cellname, cellnamesz,
293 NULL, AFS_LOOKUP_CELL_DIRECT_MOUNT,
294 afs_cell_trace_use_lookup_mount);
295 if (IS_ERR(cell)) {
296 pr_err("kAFS: unable to lookup cell '%*.*s'\n",
297 cellnamesz, cellnamesz, cellname ?: "");
298 return PTR_ERR(cell);
299 }
300 afs_unuse_cell(ctx->cell, afs_cell_trace_unuse_parse);
301 afs_see_cell(cell, afs_cell_trace_see_source);
302 ctx->cell = cell;
303 }
304
305 _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
306 ctx->cell->name, ctx->cell,
307 ctx->volnamesz, ctx->volnamesz, ctx->volname,
308 suffix ?: "-", ctx->type, ctx->force ? " FORCE" : "");
309
310 fc->source = param->string;
311 param->string = NULL;
312 return 0;
313}
314
315/*
316 * Parse a single mount parameter.
317 */
318static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param)
319{
320 struct fs_parse_result result;
321 struct afs_fs_context *ctx = fc->fs_private;
322 int opt;
323
324 opt = fs_parse(fc, afs_fs_parameters, param, &result);
325 if (opt < 0)
326 return opt;
327
328 switch (opt) {
329 case Opt_source:
330 return afs_parse_source(fc, param);
331
332 case Opt_autocell:
333 ctx->autocell = true;
334 break;
335
336 case Opt_dyn:
337 ctx->dyn_root = true;
338 break;
339
340 case Opt_flock:
341 ctx->flock_mode = result.uint_32;
342 break;
343
344 default:
345 return -EINVAL;
346 }
347
348 _leave(" = 0");
349 return 0;
350}
351
352/*
353 * Validate the options, get the cell key and look up the volume.
354 */
355static int afs_validate_fc(struct fs_context *fc)
356{
357 struct afs_fs_context *ctx = fc->fs_private;
358 struct afs_volume *volume;
359 struct afs_cell *cell;
360 struct key *key;
361 int ret;
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 reget_key:
375 /* We try to do the mount securely. */
376 key = afs_request_key(ctx->cell);
377 if (IS_ERR(key))
378 return PTR_ERR(key);
379
380 ctx->key = key;
381
382 if (ctx->volume) {
383 afs_put_volume(ctx->volume, afs_volume_trace_put_validate_fc);
384 ctx->volume = NULL;
385 }
386
387 if (test_bit(AFS_CELL_FL_CHECK_ALIAS, &ctx->cell->flags)) {
388 ret = afs_cell_detect_alias(ctx->cell, key);
389 if (ret < 0)
390 return ret;
391 if (ret == 1) {
392 _debug("switch to alias");
393 key_put(ctx->key);
394 ctx->key = NULL;
395 cell = afs_use_cell(ctx->cell->alias_of,
396 afs_cell_trace_use_fc_alias);
397 afs_unuse_cell(ctx->cell, afs_cell_trace_unuse_fc);
398 ctx->cell = cell;
399 goto reget_key;
400 }
401 }
402
403 volume = afs_create_volume(ctx);
404 if (IS_ERR(volume))
405 return PTR_ERR(volume);
406
407 ctx->volume = volume;
408 if (volume->type != AFSVL_RWVOL) {
409 ctx->flock_mode = afs_flock_mode_local;
410 fc->sb_flags |= SB_RDONLY;
411 }
412 }
413
414 return 0;
415}
416
417/*
418 * check a superblock to see if it's the one we're looking for
419 */
420static int afs_test_super(struct super_block *sb, struct fs_context *fc)
421{
422 struct afs_fs_context *ctx = fc->fs_private;
423 struct afs_super_info *as = AFS_FS_S(sb);
424
425 return (as->net_ns == fc->net_ns &&
426 as->volume &&
427 as->volume->vid == ctx->volume->vid &&
428 as->cell == ctx->cell &&
429 !as->dyn_root);
430}
431
432static int afs_dynroot_test_super(struct super_block *sb, struct fs_context *fc)
433{
434 struct afs_super_info *as = AFS_FS_S(sb);
435
436 return (as->net_ns == fc->net_ns &&
437 as->dyn_root);
438}
439
440static int afs_set_super(struct super_block *sb, struct fs_context *fc)
441{
442 return set_anon_super(sb, NULL);
443}
444
445/*
446 * fill in the superblock
447 */
448static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
449{
450 struct afs_super_info *as = AFS_FS_S(sb);
451 struct inode *inode = NULL;
452 int ret;
453
454 _enter("");
455
456 /* fill in the superblock */
457 sb->s_blocksize = PAGE_SIZE;
458 sb->s_blocksize_bits = PAGE_SHIFT;
459 sb->s_maxbytes = MAX_LFS_FILESIZE;
460 sb->s_magic = AFS_FS_MAGIC;
461 sb->s_op = &afs_super_ops;
462 if (!as->dyn_root)
463 sb->s_xattr = afs_xattr_handlers;
464 ret = super_setup_bdi(sb);
465 if (ret)
466 return ret;
467
468 /* allocate the root inode and dentry */
469 if (as->dyn_root) {
470 inode = afs_dynroot_iget_root(sb);
471 } else {
472 sprintf(sb->s_id, "%llu", as->volume->vid);
473 afs_activate_volume(as->volume);
474 inode = afs_root_iget(sb, ctx->key);
475 }
476
477 if (IS_ERR(inode))
478 return PTR_ERR(inode);
479
480 ret = -ENOMEM;
481 sb->s_root = d_make_root(inode);
482 if (!sb->s_root)
483 goto error;
484
485 if (as->dyn_root) {
486 set_default_d_op(sb, &afs_dynroot_dentry_operations);
487 } else {
488 set_default_d_op(sb, &afs_fs_dentry_operations);
489 rcu_assign_pointer(as->volume->sb, sb);
490 }
491
492 _leave(" = 0");
493 return 0;
494
495error:
496 _leave(" = %d", ret);
497 return ret;
498}
499
500static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc)
501{
502 struct afs_fs_context *ctx = fc->fs_private;
503 struct afs_super_info *as;
504
505 as = kzalloc_obj(struct afs_super_info);
506 if (as) {
507 as->net_ns = get_net(fc->net_ns);
508 as->flock_mode = ctx->flock_mode;
509 if (ctx->dyn_root) {
510 as->dyn_root = true;
511 } else {
512 as->cell = afs_use_cell(ctx->cell, afs_cell_trace_use_sbi);
513 as->volume = afs_get_volume(ctx->volume,
514 afs_volume_trace_get_alloc_sbi);
515 }
516 }
517 return as;
518}
519
520static void afs_destroy_sbi(struct afs_super_info *as)
521{
522 if (as) {
523 afs_put_volume(as->volume, afs_volume_trace_put_destroy_sbi);
524 afs_unuse_cell(as->cell, afs_cell_trace_unuse_sbi);
525 put_net(as->net_ns);
526 kfree_rcu(as, rcu);
527 }
528}
529
530static void afs_kill_super(struct super_block *sb)
531{
532 struct afs_super_info *as = AFS_FS_S(sb);
533
534 /* Clear the callback interests (which will do ilookup5) before
535 * deactivating the superblock.
536 */
537 if (as->volume)
538 rcu_assign_pointer(as->volume->sb, NULL);
539 kill_anon_super(sb);
540 if (as->volume)
541 afs_deactivate_volume(as->volume);
542 afs_destroy_sbi(as);
543}
544
545/*
546 * Get an AFS superblock and root directory.
547 */
548static int afs_get_tree(struct fs_context *fc)
549{
550 struct afs_fs_context *ctx = fc->fs_private;
551 struct super_block *sb;
552 struct afs_super_info *as;
553 int ret;
554
555 ret = afs_validate_fc(fc);
556 if (ret)
557 goto error;
558
559 _enter("");
560
561 /* allocate a superblock info record */
562 ret = -ENOMEM;
563 as = afs_alloc_sbi(fc);
564 if (!as)
565 goto error;
566 fc->s_fs_info = as;
567
568 /* allocate a deviceless superblock */
569 sb = sget_fc(fc,
570 as->dyn_root ? afs_dynroot_test_super : afs_test_super,
571 afs_set_super);
572 if (IS_ERR(sb)) {
573 ret = PTR_ERR(sb);
574 goto error;
575 }
576
577 if (!sb->s_root) {
578 /* initial superblock/root creation */
579 _debug("create");
580 ret = afs_fill_super(sb, ctx);
581 if (ret < 0)
582 goto error_sb;
583 sb->s_flags |= SB_ACTIVE;
584 } else {
585 _debug("reuse");
586 ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
587 }
588
589 fc->root = dget(sb->s_root);
590 if (!ctx->dyn_root)
591 trace_afs_get_tree(as->cell, as->volume);
592 _leave(" = 0 [%p]", sb);
593 return 0;
594
595error_sb:
596 deactivate_locked_super(sb);
597error:
598 _leave(" = %d", ret);
599 return ret;
600}
601
602static void afs_free_fc(struct fs_context *fc)
603{
604 struct afs_fs_context *ctx = fc->fs_private;
605
606 afs_destroy_sbi(fc->s_fs_info);
607 afs_put_volume(ctx->volume, afs_volume_trace_put_free_fc);
608 afs_unuse_cell(ctx->cell, afs_cell_trace_unuse_fc);
609 key_put(ctx->key);
610 kfree(ctx);
611}
612
613static const struct fs_context_operations afs_context_ops = {
614 .free = afs_free_fc,
615 .parse_param = afs_parse_param,
616 .get_tree = afs_get_tree,
617};
618
619/*
620 * Set up the filesystem mount context.
621 */
622static int afs_init_fs_context(struct fs_context *fc)
623{
624 struct afs_fs_context *ctx;
625 struct afs_cell *cell;
626
627 ctx = kzalloc_obj(struct afs_fs_context);
628 if (!ctx)
629 return -ENOMEM;
630
631 ctx->type = AFSVL_ROVOL;
632 ctx->net = afs_net(fc->net_ns);
633
634 /* Default to the workstation cell. */
635 cell = afs_find_cell(ctx->net, NULL, 0, afs_cell_trace_use_fc);
636 if (IS_ERR(cell))
637 cell = NULL;
638 ctx->cell = cell;
639
640 fc->fs_private = ctx;
641 fc->ops = &afs_context_ops;
642 return 0;
643}
644
645/*
646 * Initialise an inode cache slab element prior to any use. Note that
647 * afs_alloc_inode() *must* reset anything that could incorrectly leak from one
648 * inode to another.
649 */
650static void afs_i_init_once(void *_vnode)
651{
652 struct afs_vnode *vnode = _vnode;
653
654 memset(vnode, 0, sizeof(*vnode));
655 inode_init_once(&vnode->netfs.inode);
656 INIT_LIST_HEAD(&vnode->io_lock_waiters);
657 init_rwsem(&vnode->validate_lock);
658 spin_lock_init(&vnode->wb_lock);
659 spin_lock_init(&vnode->lock);
660 INIT_LIST_HEAD(&vnode->wb_keys);
661 INIT_LIST_HEAD(&vnode->pending_locks);
662 INIT_LIST_HEAD(&vnode->granted_locks);
663 INIT_LIST_HEAD(&vnode->cb_mmap_link);
664 seqlock_init(&vnode->cb_lock);
665}
666
667/*
668 * allocate an AFS inode struct from our slab cache
669 */
670static struct inode *afs_alloc_inode(struct super_block *sb)
671{
672 struct afs_vnode *vnode;
673
674 vnode = alloc_inode_sb(sb, afs_inode_cachep, GFP_KERNEL);
675 if (!vnode)
676 return NULL;
677
678 atomic_inc(&afs_count_active_inodes);
679
680 /* Reset anything that shouldn't leak from one inode to the next. */
681 memset(&vnode->fid, 0, sizeof(vnode->fid));
682 memset(&vnode->status, 0, sizeof(vnode->status));
683 afs_vnode_set_cache(vnode, NULL);
684
685 vnode->volume = NULL;
686 vnode->lock_key = NULL;
687 vnode->permit_cache = NULL;
688 vnode->directory = NULL;
689 vnode->directory_size = 0;
690
691 vnode->flags = 1 << AFS_VNODE_UNSET;
692 vnode->lock_state = AFS_VNODE_LOCK_NONE;
693
694 init_rwsem(&vnode->rmdir_lock);
695 INIT_WORK(&vnode->cb_work, afs_invalidate_mmap_work);
696 INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
697
698 _leave(" = %p", &vnode->netfs.inode);
699 return &vnode->netfs.inode;
700}
701
702static void afs_free_inode(struct inode *inode)
703{
704 kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
705}
706
707/*
708 * destroy an AFS inode struct
709 */
710static void afs_destroy_inode(struct inode *inode)
711{
712 struct afs_vnode *vnode = AFS_FS_I(inode);
713
714 _enter("%p{%llx:%llu}", inode, vnode->fid.vid, vnode->fid.vnode);
715
716 _debug("DESTROY INODE %p", inode);
717
718 atomic_dec(&afs_count_active_inodes);
719}
720
721static void afs_get_volume_status_success(struct afs_operation *op)
722{
723 struct afs_volume_status *vs = &op->volstatus.vs;
724 struct kstatfs *buf = op->volstatus.buf;
725
726 if (vs->max_quota == 0)
727 buf->f_blocks = vs->part_max_blocks;
728 else
729 buf->f_blocks = vs->max_quota;
730
731 if (buf->f_blocks > vs->blocks_in_use)
732 buf->f_bavail = buf->f_bfree =
733 buf->f_blocks - vs->blocks_in_use;
734}
735
736static const struct afs_operation_ops afs_get_volume_status_operation = {
737 .issue_afs_rpc = afs_fs_get_volume_status,
738 .issue_yfs_rpc = yfs_fs_get_volume_status,
739 .success = afs_get_volume_status_success,
740};
741
742/*
743 * return information about an AFS volume
744 */
745static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
746{
747 struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
748 struct afs_operation *op;
749 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
750
751 buf->f_type = dentry->d_sb->s_magic;
752 buf->f_bsize = AFS_BLOCK_SIZE;
753 buf->f_namelen = AFSNAMEMAX - 1;
754
755 if (as->dyn_root) {
756 buf->f_blocks = 1;
757 buf->f_bavail = 0;
758 buf->f_bfree = 0;
759 return 0;
760 }
761
762 op = afs_alloc_operation(NULL, as->volume);
763 if (IS_ERR(op))
764 return PTR_ERR(op);
765
766 afs_op_set_vnode(op, 0, vnode);
767 op->nr_files = 1;
768 op->volstatus.buf = buf;
769 op->ops = &afs_get_volume_status_operation;
770 return afs_do_sync_operation(op);
771}