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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_description 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 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
84static 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
92static 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
100
101int __init afs_fs_init(void)
102{
103 int ret;
104
105 _enter("");
106
107
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
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
135
136void 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
151
152
153 rcu_barrier();
154 kmem_cache_destroy(afs_inode_cachep);
155 _leave("");
156}
157
158
159
160
161static 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
194
195static 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
219
220
221
222
223
224
225
226
227
228
229
230static 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
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
255 if (name[0] == '%') {
256 ctx->type = AFSVL_RWVOL;
257 ctx->force = true;
258 }
259 name++;
260
261
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
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
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
319
320static 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
356
357static 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
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
398
399static 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
410static 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
418static int afs_set_super(struct super_block *sb, struct fs_context *fc)
419{
420 return set_anon_super(sb, NULL);
421}
422
423
424
425
426static 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
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
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
486error:
487 _leave(" = %d", ret);
488 return ret;
489}
490
491static 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
510static 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
520static 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
529
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
541
542static 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
556 ret = -ENOMEM;
557 as = afs_alloc_sbi(fc);
558 if (!as)
559 goto error;
560 fc->s_fs_info = as;
561
562
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
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
588error_sb:
589 deactivate_locked_super(sb);
590error:
591 _leave(" = %d", ret);
592 return ret;
593}
594
595static 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
606static 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
614
615static 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
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
642
643
644
645static 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
664
665static 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
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
696static void afs_free_inode(struct inode *inode)
697{
698 kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
699}
700
701
702
703
704static 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
719
720static 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