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Linux/fs/afs/super.c

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

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