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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 .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
66static struct kmem_cache *afs_inode_cachep;
67static atomic_t afs_count_active_inodes;
68
69enum afs_param {
70 Opt_autocell,
71 Opt_dyn,
72 Opt_flock,
73 Opt_source,
74};
75
76static const struct constant_table afs_param_flock[] = {
77 {"local", afs_flock_mode_local },
78 {"openafs", afs_flock_mode_openafs },
79 {"strict", afs_flock_mode_strict },
80 {"write", afs_flock_mode_write },
81 {}
82};
83
84static const struct fs_parameter_spec afs_fs_parameters[] = {
85 fsparam_flag ("autocell", Opt_autocell),
86 fsparam_flag ("dyn", Opt_dyn),
87 fsparam_enum ("flock", Opt_flock, afs_param_flock),
88 fsparam_string("source", Opt_source),
89 {}
90};
91
92
93
94
95int __init afs_fs_init(void)
96{
97 int ret;
98
99 _enter("");
100
101
102 atomic_set(&afs_count_active_inodes, 0);
103
104 ret = -ENOMEM;
105 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
106 sizeof(struct afs_vnode),
107 0,
108 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
109 afs_i_init_once);
110 if (!afs_inode_cachep) {
111 printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
112 return ret;
113 }
114
115
116 ret = register_filesystem(&afs_fs_type);
117 if (ret < 0) {
118 kmem_cache_destroy(afs_inode_cachep);
119 _leave(" = %d", ret);
120 return ret;
121 }
122
123 _leave(" = 0");
124 return 0;
125}
126
127
128
129
130void afs_fs_exit(void)
131{
132 _enter("");
133
134 afs_mntpt_kill_timer();
135 unregister_filesystem(&afs_fs_type);
136
137 if (atomic_read(&afs_count_active_inodes) != 0) {
138 printk("kAFS: %d active inode objects still present\n",
139 atomic_read(&afs_count_active_inodes));
140 BUG();
141 }
142
143
144
145
146
147 rcu_barrier();
148 kmem_cache_destroy(afs_inode_cachep);
149 _leave("");
150}
151
152
153
154
155static int afs_show_devname(struct seq_file *m, struct dentry *root)
156{
157 struct afs_super_info *as = AFS_FS_S(root->d_sb);
158 struct afs_volume *volume = as->volume;
159 struct afs_cell *cell = as->cell;
160 const char *suf = "";
161 char pref = '%';
162
163 if (as->dyn_root) {
164 seq_puts(m, "none");
165 return 0;
166 }
167
168 switch (volume->type) {
169 case AFSVL_RWVOL:
170 break;
171 case AFSVL_ROVOL:
172 pref = '#';
173 if (volume->type_force)
174 suf = ".readonly";
175 break;
176 case AFSVL_BACKVOL:
177 pref = '#';
178 suf = ".backup";
179 break;
180 }
181
182 seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
183 return 0;
184}
185
186
187
188
189static int afs_show_options(struct seq_file *m, struct dentry *root)
190{
191 struct afs_super_info *as = AFS_FS_S(root->d_sb);
192 const char *p = NULL;
193
194 if (as->dyn_root)
195 seq_puts(m, ",dyn");
196 if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
197 seq_puts(m, ",autocell");
198 switch (as->flock_mode) {
199 case afs_flock_mode_unset: break;
200 case afs_flock_mode_local: p = "local"; break;
201 case afs_flock_mode_openafs: p = "openafs"; break;
202 case afs_flock_mode_strict: p = "strict"; break;
203 case afs_flock_mode_write: p = "write"; break;
204 }
205 if (p)
206 seq_printf(m, ",flock=%s", p);
207
208 return 0;
209}
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224static int afs_parse_source(struct fs_context *fc, struct fs_parameter *param)
225{
226 struct afs_fs_context *ctx = fc->fs_private;
227 struct afs_cell *cell;
228 const char *cellname, *suffix, *name = param->string;
229 int cellnamesz;
230
231 _enter(",%s", name);
232
233 if (!name) {
234 printk(KERN_ERR "kAFS: no volume name specified\n");
235 return -EINVAL;
236 }
237
238 if ((name[0] != '%' && name[0] != '#') || !name[1]) {
239
240 if (strcmp(name, "none") == 0) {
241 ctx->no_cell = true;
242 return 0;
243 }
244 printk(KERN_ERR "kAFS: unparsable volume name\n");
245 return -EINVAL;
246 }
247
248
249 if (name[0] == '%') {
250 ctx->type = AFSVL_RWVOL;
251 ctx->force = true;
252 }
253 name++;
254
255
256 ctx->volname = strchr(name, ':');
257 if (ctx->volname) {
258 cellname = name;
259 cellnamesz = ctx->volname - name;
260 ctx->volname++;
261 } else {
262 ctx->volname = name;
263 cellname = NULL;
264 cellnamesz = 0;
265 }
266
267
268 suffix = strrchr(ctx->volname, '.');
269 if (suffix) {
270 if (strcmp(suffix, ".readonly") == 0) {
271 ctx->type = AFSVL_ROVOL;
272 ctx->force = true;
273 } else if (strcmp(suffix, ".backup") == 0) {
274 ctx->type = AFSVL_BACKVOL;
275 ctx->force = true;
276 } else if (suffix[1] == 0) {
277 } else {
278 suffix = NULL;
279 }
280 }
281
282 ctx->volnamesz = suffix ?
283 suffix - ctx->volname : strlen(ctx->volname);
284
285 _debug("cell %*.*s [%p]",
286 cellnamesz, cellnamesz, cellname ?: "", ctx->cell);
287
288
289 if (cellname) {
290 cell = afs_lookup_cell(ctx->net, cellname, cellnamesz,
291 NULL, false);
292 if (IS_ERR(cell)) {
293 pr_err("kAFS: unable to lookup cell '%*.*s'\n",
294 cellnamesz, cellnamesz, cellname ?: "");
295 return PTR_ERR(cell);
296 }
297 afs_put_cell(ctx->net, ctx->cell);
298 ctx->cell = cell;
299 }
300
301 _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
302 ctx->cell->name, ctx->cell,
303 ctx->volnamesz, ctx->volnamesz, ctx->volname,
304 suffix ?: "-", ctx->type, ctx->force ? " FORCE" : "");
305
306 fc->source = param->string;
307 param->string = NULL;
308 return 0;
309}
310
311
312
313
314static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param)
315{
316 struct fs_parse_result result;
317 struct afs_fs_context *ctx = fc->fs_private;
318 int opt;
319
320 opt = fs_parse(fc, afs_fs_parameters, param, &result);
321 if (opt < 0)
322 return opt;
323
324 switch (opt) {
325 case Opt_source:
326 return afs_parse_source(fc, param);
327
328 case Opt_autocell:
329 ctx->autocell = true;
330 break;
331
332 case Opt_dyn:
333 ctx->dyn_root = true;
334 break;
335
336 case Opt_flock:
337 ctx->flock_mode = result.uint_32;
338 break;
339
340 default:
341 return -EINVAL;
342 }
343
344 _leave(" = 0");
345 return 0;
346}
347
348
349
350
351static int afs_validate_fc(struct fs_context *fc)
352{
353 struct afs_fs_context *ctx = fc->fs_private;
354 struct afs_volume *volume;
355 struct afs_cell *cell;
356 struct key *key;
357 int ret;
358
359 if (!ctx->dyn_root) {
360 if (ctx->no_cell) {
361 pr_warn("kAFS: Can only specify source 'none' with -o dyn\n");
362 return -EINVAL;
363 }
364
365 if (!ctx->cell) {
366 pr_warn("kAFS: No cell specified\n");
367 return -EDESTADDRREQ;
368 }
369
370 reget_key:
371
372 key = afs_request_key(ctx->cell);
373 if (IS_ERR(key))
374 return PTR_ERR(key);
375
376 ctx->key = key;
377
378 if (ctx->volume) {
379 afs_put_volume(ctx->net, ctx->volume,
380 afs_volume_trace_put_validate_fc);
381 ctx->volume = NULL;
382 }
383
384 if (test_bit(AFS_CELL_FL_CHECK_ALIAS, &ctx->cell->flags)) {
385 ret = afs_cell_detect_alias(ctx->cell, key);
386 if (ret < 0)
387 return ret;
388 if (ret == 1) {
389 _debug("switch to alias");
390 key_put(ctx->key);
391 ctx->key = NULL;
392 cell = afs_get_cell(ctx->cell->alias_of);
393 afs_put_cell(ctx->net, ctx->cell);
394 ctx->cell = cell;
395 goto reget_key;
396 }
397 }
398
399 volume = afs_create_volume(ctx);
400 if (IS_ERR(volume))
401 return PTR_ERR(volume);
402
403 ctx->volume = volume;
404 }
405
406 return 0;
407}
408
409
410
411
412static int afs_test_super(struct super_block *sb, struct fs_context *fc)
413{
414 struct afs_fs_context *ctx = fc->fs_private;
415 struct afs_super_info *as = AFS_FS_S(sb);
416
417 return (as->net_ns == fc->net_ns &&
418 as->volume &&
419 as->volume->vid == ctx->volume->vid &&
420 as->cell == ctx->cell &&
421 !as->dyn_root);
422}
423
424static int afs_dynroot_test_super(struct super_block *sb, struct fs_context *fc)
425{
426 struct afs_super_info *as = AFS_FS_S(sb);
427
428 return (as->net_ns == fc->net_ns &&
429 as->dyn_root);
430}
431
432static int afs_set_super(struct super_block *sb, struct fs_context *fc)
433{
434 return set_anon_super(sb, NULL);
435}
436
437
438
439
440static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
441{
442 struct afs_super_info *as = AFS_FS_S(sb);
443 struct inode *inode = NULL;
444 int ret;
445
446 _enter("");
447
448
449 sb->s_blocksize = PAGE_SIZE;
450 sb->s_blocksize_bits = PAGE_SHIFT;
451 sb->s_maxbytes = MAX_LFS_FILESIZE;
452 sb->s_magic = AFS_FS_MAGIC;
453 sb->s_op = &afs_super_ops;
454 if (!as->dyn_root)
455 sb->s_xattr = afs_xattr_handlers;
456 ret = super_setup_bdi(sb);
457 if (ret)
458 return ret;
459 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
460
461
462 if (as->dyn_root) {
463 inode = afs_iget_pseudo_dir(sb, true);
464 } else {
465 sprintf(sb->s_id, "%llu", as->volume->vid);
466 afs_activate_volume(as->volume);
467 inode = afs_root_iget(sb, ctx->key);
468 }
469
470 if (IS_ERR(inode))
471 return PTR_ERR(inode);
472
473 if (ctx->autocell || as->dyn_root)
474 set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
475
476 ret = -ENOMEM;
477 sb->s_root = d_make_root(inode);
478 if (!sb->s_root)
479 goto error;
480
481 if (as->dyn_root) {
482 sb->s_d_op = &afs_dynroot_dentry_operations;
483 ret = afs_dynroot_populate(sb);
484 if (ret < 0)
485 goto error;
486 } else {
487 sb->s_d_op = &afs_fs_dentry_operations;
488 rcu_assign_pointer(as->volume->sb, sb);
489 }
490
491 _leave(" = 0");
492 return 0;
493
494error:
495 _leave(" = %d", ret);
496 return ret;
497}
498
499static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc)
500{
501 struct afs_fs_context *ctx = fc->fs_private;
502 struct afs_super_info *as;
503
504 as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
505 if (as) {
506 as->net_ns = get_net(fc->net_ns);
507 as->flock_mode = ctx->flock_mode;
508 if (ctx->dyn_root) {
509 as->dyn_root = true;
510 } else {
511 as->cell = afs_get_cell(ctx->cell);
512 as->volume = afs_get_volume(ctx->volume,
513 afs_volume_trace_get_alloc_sbi);
514 }
515 }
516 return as;
517}
518
519static void afs_destroy_sbi(struct afs_super_info *as)
520{
521 if (as) {
522 struct afs_net *net = afs_net(as->net_ns);
523 afs_put_volume(net, as->volume, afs_volume_trace_put_destroy_sbi);
524 afs_put_cell(net, as->cell);
525 put_net(as->net_ns);
526 kfree(as);
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 if (as->dyn_root)
535 afs_dynroot_depopulate(sb);
536
537
538
539
540 if (as->volume)
541 rcu_assign_pointer(as->volume->sb, NULL);
542 kill_anon_super(sb);
543 if (as->volume)
544 afs_deactivate_volume(as->volume);
545 afs_destroy_sbi(as);
546}
547
548
549
550
551static int afs_get_tree(struct fs_context *fc)
552{
553 struct afs_fs_context *ctx = fc->fs_private;
554 struct super_block *sb;
555 struct afs_super_info *as;
556 int ret;
557
558 ret = afs_validate_fc(fc);
559 if (ret)
560 goto error;
561
562 _enter("");
563
564
565 ret = -ENOMEM;
566 as = afs_alloc_sbi(fc);
567 if (!as)
568 goto error;
569 fc->s_fs_info = as;
570
571
572 sb = sget_fc(fc,
573 as->dyn_root ? afs_dynroot_test_super : afs_test_super,
574 afs_set_super);
575 if (IS_ERR(sb)) {
576 ret = PTR_ERR(sb);
577 goto error;
578 }
579
580 if (!sb->s_root) {
581
582 _debug("create");
583 ret = afs_fill_super(sb, ctx);
584 if (ret < 0)
585 goto error_sb;
586 sb->s_flags |= SB_ACTIVE;
587 } else {
588 _debug("reuse");
589 ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
590 }
591
592 fc->root = dget(sb->s_root);
593 trace_afs_get_tree(as->cell, as->volume);
594 _leave(" = 0 [%p]", sb);
595 return 0;
596
597error_sb:
598 deactivate_locked_super(sb);
599error:
600 _leave(" = %d", ret);
601 return ret;
602}
603
604static void afs_free_fc(struct fs_context *fc)
605{
606 struct afs_fs_context *ctx = fc->fs_private;
607
608 afs_destroy_sbi(fc->s_fs_info);
609 afs_put_volume(ctx->net, ctx->volume, afs_volume_trace_put_free_fc);
610 afs_put_cell(ctx->net, ctx->cell);
611 key_put(ctx->key);
612 kfree(ctx);
613}
614
615static const struct fs_context_operations afs_context_ops = {
616 .free = afs_free_fc,
617 .parse_param = afs_parse_param,
618 .get_tree = afs_get_tree,
619};
620
621
622
623
624static int afs_init_fs_context(struct fs_context *fc)
625{
626 struct afs_fs_context *ctx;
627 struct afs_cell *cell;
628
629 ctx = kzalloc(sizeof(struct afs_fs_context), GFP_KERNEL);
630 if (!ctx)
631 return -ENOMEM;
632
633 ctx->type = AFSVL_ROVOL;
634 ctx->net = afs_net(fc->net_ns);
635
636
637 rcu_read_lock();
638 cell = afs_lookup_cell_rcu(ctx->net, NULL, 0);
639 rcu_read_unlock();
640 if (IS_ERR(cell))
641 cell = NULL;
642 ctx->cell = cell;
643
644 fc->fs_private = ctx;
645 fc->ops = &afs_context_ops;
646 return 0;
647}
648
649
650
651
652
653
654static void afs_i_init_once(void *_vnode)
655{
656 struct afs_vnode *vnode = _vnode;
657
658 memset(vnode, 0, sizeof(*vnode));
659 inode_init_once(&vnode->vfs_inode);
660 mutex_init(&vnode->io_lock);
661 init_rwsem(&vnode->validate_lock);
662 spin_lock_init(&vnode->wb_lock);
663 spin_lock_init(&vnode->lock);
664 INIT_LIST_HEAD(&vnode->wb_keys);
665 INIT_LIST_HEAD(&vnode->pending_locks);
666 INIT_LIST_HEAD(&vnode->granted_locks);
667 INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
668 seqlock_init(&vnode->cb_lock);
669}
670
671
672
673
674static struct inode *afs_alloc_inode(struct super_block *sb)
675{
676 struct afs_vnode *vnode;
677
678 vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
679 if (!vnode)
680 return NULL;
681
682 atomic_inc(&afs_count_active_inodes);
683
684
685 memset(&vnode->fid, 0, sizeof(vnode->fid));
686 memset(&vnode->status, 0, sizeof(vnode->status));
687
688 vnode->volume = NULL;
689 vnode->lock_key = NULL;
690 vnode->permit_cache = NULL;
691#ifdef CONFIG_AFS_FSCACHE
692 vnode->cache = NULL;
693#endif
694
695 vnode->flags = 1 << AFS_VNODE_UNSET;
696 vnode->lock_state = AFS_VNODE_LOCK_NONE;
697
698 init_rwsem(&vnode->rmdir_lock);
699
700 _leave(" = %p", &vnode->vfs_inode);
701 return &vnode->vfs_inode;
702}
703
704static void afs_free_inode(struct inode *inode)
705{
706 kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
707}
708
709
710
711
712static void afs_destroy_inode(struct inode *inode)
713{
714 struct afs_vnode *vnode = AFS_FS_I(inode);
715
716 _enter("%p{%llx:%llu}", inode, vnode->fid.vid, vnode->fid.vnode);
717
718 _debug("DESTROY INODE %p", inode);
719
720 atomic_dec(&afs_count_active_inodes);
721}
722
723static void afs_get_volume_status_success(struct afs_operation *op)
724{
725 struct afs_volume_status *vs = &op->volstatus.vs;
726 struct kstatfs *buf = op->volstatus.buf;
727
728 if (vs->max_quota == 0)
729 buf->f_blocks = vs->part_max_blocks;
730 else
731 buf->f_blocks = vs->max_quota;
732
733 if (buf->f_blocks > vs->blocks_in_use)
734 buf->f_bavail = buf->f_bfree =
735 buf->f_blocks - vs->blocks_in_use;
736}
737
738static const struct afs_operation_ops afs_get_volume_status_operation = {
739 .issue_afs_rpc = afs_fs_get_volume_status,
740 .issue_yfs_rpc = yfs_fs_get_volume_status,
741 .success = afs_get_volume_status_success,
742};
743
744
745
746
747static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
748{
749 struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
750 struct afs_operation *op;
751 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
752
753 buf->f_type = dentry->d_sb->s_magic;
754 buf->f_bsize = AFS_BLOCK_SIZE;
755 buf->f_namelen = AFSNAMEMAX - 1;
756
757 if (as->dyn_root) {
758 buf->f_blocks = 1;
759 buf->f_bavail = 0;
760 buf->f_bfree = 0;
761 return 0;
762 }
763
764 op = afs_alloc_operation(NULL, as->volume);
765 if (IS_ERR(op))
766 return PTR_ERR(op);
767
768 afs_op_set_vnode(op, 0, vnode);
769 op->nr_files = 1;
770 op->volstatus.buf = buf;
771 op->ops = &afs_get_volume_status_operation;
772 return afs_do_sync_operation(op);
773}
774