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Merge tag 'fixes-for-v3.16-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git...
[karo-tx-linux.git] / fs / ceph / super.c
1
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/backing-dev.h>
5 #include <linux/ctype.h>
6 #include <linux/fs.h>
7 #include <linux/inet.h>
8 #include <linux/in6.h>
9 #include <linux/module.h>
10 #include <linux/mount.h>
11 #include <linux/parser.h>
12 #include <linux/sched.h>
13 #include <linux/seq_file.h>
14 #include <linux/slab.h>
15 #include <linux/statfs.h>
16 #include <linux/string.h>
17
18 #include "super.h"
19 #include "mds_client.h"
20 #include "cache.h"
21
22 #include <linux/ceph/ceph_features.h>
23 #include <linux/ceph/decode.h>
24 #include <linux/ceph/mon_client.h>
25 #include <linux/ceph/auth.h>
26 #include <linux/ceph/debugfs.h>
27
28 /*
29  * Ceph superblock operations
30  *
31  * Handle the basics of mounting, unmounting.
32  */
33
34 /*
35  * super ops
36  */
37 static void ceph_put_super(struct super_block *s)
38 {
39         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
40
41         dout("put_super\n");
42         ceph_mdsc_close_sessions(fsc->mdsc);
43
44         /*
45          * ensure we release the bdi before put_anon_super releases
46          * the device name.
47          */
48         if (s->s_bdi == &fsc->backing_dev_info) {
49                 bdi_unregister(&fsc->backing_dev_info);
50                 s->s_bdi = NULL;
51         }
52
53         return;
54 }
55
56 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
57 {
58         struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
59         struct ceph_monmap *monmap = fsc->client->monc.monmap;
60         struct ceph_statfs st;
61         u64 fsid;
62         int err;
63
64         dout("statfs\n");
65         err = ceph_monc_do_statfs(&fsc->client->monc, &st);
66         if (err < 0)
67                 return err;
68
69         /* fill in kstatfs */
70         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
71
72         /*
73          * express utilization in terms of large blocks to avoid
74          * overflow on 32-bit machines.
75          *
76          * NOTE: for the time being, we make bsize == frsize to humor
77          * not-yet-ancient versions of glibc that are broken.
78          * Someday, we will probably want to report a real block
79          * size...  whatever that may mean for a network file system!
80          */
81         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
82         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
83         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
84         buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
85         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
86
87         buf->f_files = le64_to_cpu(st.num_objects);
88         buf->f_ffree = -1;
89         buf->f_namelen = NAME_MAX;
90
91         /* leave fsid little-endian, regardless of host endianness */
92         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
93         buf->f_fsid.val[0] = fsid & 0xffffffff;
94         buf->f_fsid.val[1] = fsid >> 32;
95
96         return 0;
97 }
98
99
100 static int ceph_sync_fs(struct super_block *sb, int wait)
101 {
102         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
103
104         if (!wait) {
105                 dout("sync_fs (non-blocking)\n");
106                 ceph_flush_dirty_caps(fsc->mdsc);
107                 dout("sync_fs (non-blocking) done\n");
108                 return 0;
109         }
110
111         dout("sync_fs (blocking)\n");
112         ceph_osdc_sync(&fsc->client->osdc);
113         ceph_mdsc_sync(fsc->mdsc);
114         dout("sync_fs (blocking) done\n");
115         return 0;
116 }
117
118 /*
119  * mount options
120  */
121 enum {
122         Opt_wsize,
123         Opt_rsize,
124         Opt_rasize,
125         Opt_caps_wanted_delay_min,
126         Opt_caps_wanted_delay_max,
127         Opt_cap_release_safety,
128         Opt_readdir_max_entries,
129         Opt_readdir_max_bytes,
130         Opt_congestion_kb,
131         Opt_last_int,
132         /* int args above */
133         Opt_snapdirname,
134         Opt_last_string,
135         /* string args above */
136         Opt_dirstat,
137         Opt_nodirstat,
138         Opt_rbytes,
139         Opt_norbytes,
140         Opt_asyncreaddir,
141         Opt_noasyncreaddir,
142         Opt_dcache,
143         Opt_nodcache,
144         Opt_ino32,
145         Opt_noino32,
146         Opt_fscache,
147         Opt_nofscache,
148 #ifdef CONFIG_CEPH_FS_POSIX_ACL
149         Opt_acl,
150 #endif
151         Opt_noacl
152 };
153
154 static match_table_t fsopt_tokens = {
155         {Opt_wsize, "wsize=%d"},
156         {Opt_rsize, "rsize=%d"},
157         {Opt_rasize, "rasize=%d"},
158         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
159         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
160         {Opt_cap_release_safety, "cap_release_safety=%d"},
161         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
162         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
163         {Opt_congestion_kb, "write_congestion_kb=%d"},
164         /* int args above */
165         {Opt_snapdirname, "snapdirname=%s"},
166         /* string args above */
167         {Opt_dirstat, "dirstat"},
168         {Opt_nodirstat, "nodirstat"},
169         {Opt_rbytes, "rbytes"},
170         {Opt_norbytes, "norbytes"},
171         {Opt_asyncreaddir, "asyncreaddir"},
172         {Opt_noasyncreaddir, "noasyncreaddir"},
173         {Opt_dcache, "dcache"},
174         {Opt_nodcache, "nodcache"},
175         {Opt_ino32, "ino32"},
176         {Opt_noino32, "noino32"},
177         {Opt_fscache, "fsc"},
178         {Opt_nofscache, "nofsc"},
179 #ifdef CONFIG_CEPH_FS_POSIX_ACL
180         {Opt_acl, "acl"},
181 #endif
182         {Opt_noacl, "noacl"},
183         {-1, NULL}
184 };
185
186 static int parse_fsopt_token(char *c, void *private)
187 {
188         struct ceph_mount_options *fsopt = private;
189         substring_t argstr[MAX_OPT_ARGS];
190         int token, intval, ret;
191
192         token = match_token((char *)c, fsopt_tokens, argstr);
193         if (token < 0)
194                 return -EINVAL;
195
196         if (token < Opt_last_int) {
197                 ret = match_int(&argstr[0], &intval);
198                 if (ret < 0) {
199                         pr_err("bad mount option arg (not int) "
200                                "at '%s'\n", c);
201                         return ret;
202                 }
203                 dout("got int token %d val %d\n", token, intval);
204         } else if (token > Opt_last_int && token < Opt_last_string) {
205                 dout("got string token %d val %s\n", token,
206                      argstr[0].from);
207         } else {
208                 dout("got token %d\n", token);
209         }
210
211         switch (token) {
212         case Opt_snapdirname:
213                 kfree(fsopt->snapdir_name);
214                 fsopt->snapdir_name = kstrndup(argstr[0].from,
215                                                argstr[0].to-argstr[0].from,
216                                                GFP_KERNEL);
217                 if (!fsopt->snapdir_name)
218                         return -ENOMEM;
219                 break;
220
221                 /* misc */
222         case Opt_wsize:
223                 fsopt->wsize = intval;
224                 break;
225         case Opt_rsize:
226                 fsopt->rsize = intval;
227                 break;
228         case Opt_rasize:
229                 fsopt->rasize = intval;
230                 break;
231         case Opt_caps_wanted_delay_min:
232                 fsopt->caps_wanted_delay_min = intval;
233                 break;
234         case Opt_caps_wanted_delay_max:
235                 fsopt->caps_wanted_delay_max = intval;
236                 break;
237         case Opt_readdir_max_entries:
238                 fsopt->max_readdir = intval;
239                 break;
240         case Opt_readdir_max_bytes:
241                 fsopt->max_readdir_bytes = intval;
242                 break;
243         case Opt_congestion_kb:
244                 fsopt->congestion_kb = intval;
245                 break;
246         case Opt_dirstat:
247                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
248                 break;
249         case Opt_nodirstat:
250                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
251                 break;
252         case Opt_rbytes:
253                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
254                 break;
255         case Opt_norbytes:
256                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
257                 break;
258         case Opt_asyncreaddir:
259                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
260                 break;
261         case Opt_noasyncreaddir:
262                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
263                 break;
264         case Opt_dcache:
265                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
266                 break;
267         case Opt_nodcache:
268                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
269                 break;
270         case Opt_ino32:
271                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
272                 break;
273         case Opt_noino32:
274                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
275                 break;
276         case Opt_fscache:
277                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
278                 break;
279         case Opt_nofscache:
280                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
281                 break;
282 #ifdef CONFIG_CEPH_FS_POSIX_ACL
283         case Opt_acl:
284                 fsopt->sb_flags |= MS_POSIXACL;
285                 break;
286 #endif
287         case Opt_noacl:
288                 fsopt->sb_flags &= ~MS_POSIXACL;
289                 break;
290         default:
291                 BUG_ON(token);
292         }
293         return 0;
294 }
295
296 static void destroy_mount_options(struct ceph_mount_options *args)
297 {
298         dout("destroy_mount_options %p\n", args);
299         kfree(args->snapdir_name);
300         kfree(args);
301 }
302
303 static int strcmp_null(const char *s1, const char *s2)
304 {
305         if (!s1 && !s2)
306                 return 0;
307         if (s1 && !s2)
308                 return -1;
309         if (!s1 && s2)
310                 return 1;
311         return strcmp(s1, s2);
312 }
313
314 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
315                                  struct ceph_options *new_opt,
316                                  struct ceph_fs_client *fsc)
317 {
318         struct ceph_mount_options *fsopt1 = new_fsopt;
319         struct ceph_mount_options *fsopt2 = fsc->mount_options;
320         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
321         int ret;
322
323         ret = memcmp(fsopt1, fsopt2, ofs);
324         if (ret)
325                 return ret;
326
327         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
328         if (ret)
329                 return ret;
330
331         return ceph_compare_options(new_opt, fsc->client);
332 }
333
334 static int parse_mount_options(struct ceph_mount_options **pfsopt,
335                                struct ceph_options **popt,
336                                int flags, char *options,
337                                const char *dev_name,
338                                const char **path)
339 {
340         struct ceph_mount_options *fsopt;
341         const char *dev_name_end;
342         int err;
343
344         if (!dev_name || !*dev_name)
345                 return -EINVAL;
346
347         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
348         if (!fsopt)
349                 return -ENOMEM;
350
351         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
352
353         fsopt->sb_flags = flags;
354         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
355
356         fsopt->rsize = CEPH_RSIZE_DEFAULT;
357         fsopt->rasize = CEPH_RASIZE_DEFAULT;
358         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
359         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
360         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
361         fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
362         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
363         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
364         fsopt->congestion_kb = default_congestion_kb();
365
366         /*
367          * Distinguish the server list from the path in "dev_name".
368          * Internally we do not include the leading '/' in the path.
369          *
370          * "dev_name" will look like:
371          *     <server_spec>[,<server_spec>...]:[<path>]
372          * where
373          *     <server_spec> is <ip>[:<port>]
374          *     <path> is optional, but if present must begin with '/'
375          */
376         dev_name_end = strchr(dev_name, '/');
377         if (dev_name_end) {
378                 /* skip over leading '/' for path */
379                 *path = dev_name_end + 1;
380         } else {
381                 /* path is empty */
382                 dev_name_end = dev_name + strlen(dev_name);
383                 *path = dev_name_end;
384         }
385         err = -EINVAL;
386         dev_name_end--;         /* back up to ':' separator */
387         if (dev_name_end < dev_name || *dev_name_end != ':') {
388                 pr_err("device name is missing path (no : separator in %s)\n",
389                                 dev_name);
390                 goto out;
391         }
392         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
393         dout("server path '%s'\n", *path);
394
395         *popt = ceph_parse_options(options, dev_name, dev_name_end,
396                                  parse_fsopt_token, (void *)fsopt);
397         if (IS_ERR(*popt)) {
398                 err = PTR_ERR(*popt);
399                 goto out;
400         }
401
402         /* success */
403         *pfsopt = fsopt;
404         return 0;
405
406 out:
407         destroy_mount_options(fsopt);
408         return err;
409 }
410
411 /**
412  * ceph_show_options - Show mount options in /proc/mounts
413  * @m: seq_file to write to
414  * @root: root of that (sub)tree
415  */
416 static int ceph_show_options(struct seq_file *m, struct dentry *root)
417 {
418         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
419         struct ceph_mount_options *fsopt = fsc->mount_options;
420         struct ceph_options *opt = fsc->client->options;
421
422         if (opt->flags & CEPH_OPT_FSID)
423                 seq_printf(m, ",fsid=%pU", &opt->fsid);
424         if (opt->flags & CEPH_OPT_NOSHARE)
425                 seq_puts(m, ",noshare");
426         if (opt->flags & CEPH_OPT_NOCRC)
427                 seq_puts(m, ",nocrc");
428
429         if (opt->name)
430                 seq_printf(m, ",name=%s", opt->name);
431         if (opt->key)
432                 seq_puts(m, ",secret=<hidden>");
433
434         if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
435                 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
436         if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
437                 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
438         if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
439                 seq_printf(m, ",osdkeepalivetimeout=%d",
440                            opt->osd_keepalive_timeout);
441
442         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
443                 seq_puts(m, ",dirstat");
444         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
445                 seq_puts(m, ",norbytes");
446         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
447                 seq_puts(m, ",noasyncreaddir");
448         if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
449                 seq_puts(m, ",dcache");
450         else
451                 seq_puts(m, ",nodcache");
452         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
453                 seq_puts(m, ",fsc");
454         else
455                 seq_puts(m, ",nofsc");
456
457 #ifdef CONFIG_CEPH_FS_POSIX_ACL
458         if (fsopt->sb_flags & MS_POSIXACL)
459                 seq_puts(m, ",acl");
460         else
461                 seq_puts(m, ",noacl");
462 #endif
463
464         if (fsopt->wsize)
465                 seq_printf(m, ",wsize=%d", fsopt->wsize);
466         if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
467                 seq_printf(m, ",rsize=%d", fsopt->rsize);
468         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
469                 seq_printf(m, ",rasize=%d", fsopt->rasize);
470         if (fsopt->congestion_kb != default_congestion_kb())
471                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
472         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
473                 seq_printf(m, ",caps_wanted_delay_min=%d",
474                          fsopt->caps_wanted_delay_min);
475         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
476                 seq_printf(m, ",caps_wanted_delay_max=%d",
477                            fsopt->caps_wanted_delay_max);
478         if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
479                 seq_printf(m, ",cap_release_safety=%d",
480                            fsopt->cap_release_safety);
481         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
482                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
483         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
484                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
485         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
486                 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
487         return 0;
488 }
489
490 /*
491  * handle any mon messages the standard library doesn't understand.
492  * return error if we don't either.
493  */
494 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
495 {
496         struct ceph_fs_client *fsc = client->private;
497         int type = le16_to_cpu(msg->hdr.type);
498
499         switch (type) {
500         case CEPH_MSG_MDS_MAP:
501                 ceph_mdsc_handle_map(fsc->mdsc, msg);
502                 return 0;
503
504         default:
505                 return -1;
506         }
507 }
508
509 /*
510  * create a new fs client
511  */
512 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
513                                         struct ceph_options *opt)
514 {
515         struct ceph_fs_client *fsc;
516         const u64 supported_features =
517                 CEPH_FEATURE_FLOCK |
518                 CEPH_FEATURE_DIRLAYOUTHASH;
519         const u64 required_features = 0;
520         int page_count;
521         size_t size;
522         int err = -ENOMEM;
523
524         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
525         if (!fsc)
526                 return ERR_PTR(-ENOMEM);
527
528         fsc->client = ceph_create_client(opt, fsc, supported_features,
529                                          required_features);
530         if (IS_ERR(fsc->client)) {
531                 err = PTR_ERR(fsc->client);
532                 goto fail;
533         }
534         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
535         fsc->client->monc.want_mdsmap = 1;
536
537         fsc->mount_options = fsopt;
538
539         fsc->sb = NULL;
540         fsc->mount_state = CEPH_MOUNT_MOUNTING;
541
542         atomic_long_set(&fsc->writeback_count, 0);
543
544         err = bdi_init(&fsc->backing_dev_info);
545         if (err < 0)
546                 goto fail_client;
547
548         err = -ENOMEM;
549         /*
550          * The number of concurrent works can be high but they don't need
551          * to be processed in parallel, limit concurrency.
552          */
553         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
554         if (fsc->wb_wq == NULL)
555                 goto fail_bdi;
556         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
557         if (fsc->pg_inv_wq == NULL)
558                 goto fail_wb_wq;
559         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
560         if (fsc->trunc_wq == NULL)
561                 goto fail_pg_inv_wq;
562
563         /* set up mempools */
564         err = -ENOMEM;
565         page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
566         size = sizeof (struct page *) * (page_count ? page_count : 1);
567         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
568         if (!fsc->wb_pagevec_pool)
569                 goto fail_trunc_wq;
570
571         /* setup fscache */
572         if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
573             (ceph_fscache_register_fs(fsc) != 0))
574                 goto fail_fscache;
575
576         /* caps */
577         fsc->min_caps = fsopt->max_readdir;
578
579         return fsc;
580
581 fail_fscache:
582         ceph_fscache_unregister_fs(fsc);
583 fail_trunc_wq:
584         destroy_workqueue(fsc->trunc_wq);
585 fail_pg_inv_wq:
586         destroy_workqueue(fsc->pg_inv_wq);
587 fail_wb_wq:
588         destroy_workqueue(fsc->wb_wq);
589 fail_bdi:
590         bdi_destroy(&fsc->backing_dev_info);
591 fail_client:
592         ceph_destroy_client(fsc->client);
593 fail:
594         kfree(fsc);
595         return ERR_PTR(err);
596 }
597
598 static void destroy_fs_client(struct ceph_fs_client *fsc)
599 {
600         dout("destroy_fs_client %p\n", fsc);
601
602         ceph_fscache_unregister_fs(fsc);
603
604         destroy_workqueue(fsc->wb_wq);
605         destroy_workqueue(fsc->pg_inv_wq);
606         destroy_workqueue(fsc->trunc_wq);
607
608         bdi_destroy(&fsc->backing_dev_info);
609
610         mempool_destroy(fsc->wb_pagevec_pool);
611
612         destroy_mount_options(fsc->mount_options);
613
614         ceph_fs_debugfs_cleanup(fsc);
615
616         ceph_destroy_client(fsc->client);
617
618         kfree(fsc);
619         dout("destroy_fs_client %p done\n", fsc);
620 }
621
622 /*
623  * caches
624  */
625 struct kmem_cache *ceph_inode_cachep;
626 struct kmem_cache *ceph_cap_cachep;
627 struct kmem_cache *ceph_dentry_cachep;
628 struct kmem_cache *ceph_file_cachep;
629
630 static void ceph_inode_init_once(void *foo)
631 {
632         struct ceph_inode_info *ci = foo;
633         inode_init_once(&ci->vfs_inode);
634 }
635
636 static int __init init_caches(void)
637 {
638         int error = -ENOMEM;
639
640         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
641                                       sizeof(struct ceph_inode_info),
642                                       __alignof__(struct ceph_inode_info),
643                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
644                                       ceph_inode_init_once);
645         if (ceph_inode_cachep == NULL)
646                 return -ENOMEM;
647
648         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
649                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
650         if (ceph_cap_cachep == NULL)
651                 goto bad_cap;
652
653         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
654                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
655         if (ceph_dentry_cachep == NULL)
656                 goto bad_dentry;
657
658         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
659                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
660         if (ceph_file_cachep == NULL)
661                 goto bad_file;
662
663         if ((error = ceph_fscache_register()))
664                 goto bad_file;
665
666         return 0;
667 bad_file:
668         kmem_cache_destroy(ceph_dentry_cachep);
669 bad_dentry:
670         kmem_cache_destroy(ceph_cap_cachep);
671 bad_cap:
672         kmem_cache_destroy(ceph_inode_cachep);
673         return error;
674 }
675
676 static void destroy_caches(void)
677 {
678         /*
679          * Make sure all delayed rcu free inodes are flushed before we
680          * destroy cache.
681          */
682         rcu_barrier();
683
684         kmem_cache_destroy(ceph_inode_cachep);
685         kmem_cache_destroy(ceph_cap_cachep);
686         kmem_cache_destroy(ceph_dentry_cachep);
687         kmem_cache_destroy(ceph_file_cachep);
688
689         ceph_fscache_unregister();
690 }
691
692
693 /*
694  * ceph_umount_begin - initiate forced umount.  Tear down down the
695  * mount, skipping steps that may hang while waiting for server(s).
696  */
697 static void ceph_umount_begin(struct super_block *sb)
698 {
699         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
700
701         dout("ceph_umount_begin - starting forced umount\n");
702         if (!fsc)
703                 return;
704         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
705         return;
706 }
707
708 static const struct super_operations ceph_super_ops = {
709         .alloc_inode    = ceph_alloc_inode,
710         .destroy_inode  = ceph_destroy_inode,
711         .write_inode    = ceph_write_inode,
712         .drop_inode     = ceph_drop_inode,
713         .sync_fs        = ceph_sync_fs,
714         .put_super      = ceph_put_super,
715         .show_options   = ceph_show_options,
716         .statfs         = ceph_statfs,
717         .umount_begin   = ceph_umount_begin,
718 };
719
720 /*
721  * Bootstrap mount by opening the root directory.  Note the mount
722  * @started time from caller, and time out if this takes too long.
723  */
724 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
725                                        const char *path,
726                                        unsigned long started)
727 {
728         struct ceph_mds_client *mdsc = fsc->mdsc;
729         struct ceph_mds_request *req = NULL;
730         int err;
731         struct dentry *root;
732
733         /* open dir */
734         dout("open_root_inode opening '%s'\n", path);
735         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
736         if (IS_ERR(req))
737                 return ERR_CAST(req);
738         req->r_path1 = kstrdup(path, GFP_NOFS);
739         req->r_ino1.ino = CEPH_INO_ROOT;
740         req->r_ino1.snap = CEPH_NOSNAP;
741         req->r_started = started;
742         req->r_timeout = fsc->client->options->mount_timeout * HZ;
743         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
744         req->r_num_caps = 2;
745         err = ceph_mdsc_do_request(mdsc, NULL, req);
746         if (err == 0) {
747                 struct inode *inode = req->r_target_inode;
748                 req->r_target_inode = NULL;
749                 dout("open_root_inode success\n");
750                 if (ceph_ino(inode) == CEPH_INO_ROOT &&
751                     fsc->sb->s_root == NULL) {
752                         root = d_make_root(inode);
753                         if (!root) {
754                                 root = ERR_PTR(-ENOMEM);
755                                 goto out;
756                         }
757                 } else {
758                         root = d_obtain_alias(inode);
759                 }
760                 ceph_init_dentry(root);
761                 dout("open_root_inode success, root dentry is %p\n", root);
762         } else {
763                 root = ERR_PTR(err);
764         }
765 out:
766         ceph_mdsc_put_request(req);
767         return root;
768 }
769
770
771
772
773 /*
774  * mount: join the ceph cluster, and open root directory.
775  */
776 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
777                       const char *path)
778 {
779         int err;
780         unsigned long started = jiffies;  /* note the start time */
781         struct dentry *root;
782         int first = 0;   /* first vfsmount for this super_block */
783
784         dout("mount start\n");
785         mutex_lock(&fsc->client->mount_mutex);
786
787         err = __ceph_open_session(fsc->client, started);
788         if (err < 0)
789                 goto out;
790
791         dout("mount opening root\n");
792         root = open_root_dentry(fsc, "", started);
793         if (IS_ERR(root)) {
794                 err = PTR_ERR(root);
795                 goto out;
796         }
797         if (fsc->sb->s_root) {
798                 dput(root);
799         } else {
800                 fsc->sb->s_root = root;
801                 first = 1;
802
803                 err = ceph_fs_debugfs_init(fsc);
804                 if (err < 0)
805                         goto fail;
806         }
807
808         if (path[0] == 0) {
809                 dget(root);
810         } else {
811                 dout("mount opening base mountpoint\n");
812                 root = open_root_dentry(fsc, path, started);
813                 if (IS_ERR(root)) {
814                         err = PTR_ERR(root);
815                         goto fail;
816                 }
817         }
818
819         fsc->mount_state = CEPH_MOUNT_MOUNTED;
820         dout("mount success\n");
821         mutex_unlock(&fsc->client->mount_mutex);
822         return root;
823
824 out:
825         mutex_unlock(&fsc->client->mount_mutex);
826         return ERR_PTR(err);
827
828 fail:
829         if (first) {
830                 dput(fsc->sb->s_root);
831                 fsc->sb->s_root = NULL;
832         }
833         goto out;
834 }
835
836 static int ceph_set_super(struct super_block *s, void *data)
837 {
838         struct ceph_fs_client *fsc = data;
839         int ret;
840
841         dout("set_super %p data %p\n", s, data);
842
843         s->s_flags = fsc->mount_options->sb_flags;
844         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
845
846         s->s_xattr = ceph_xattr_handlers;
847         s->s_fs_info = fsc;
848         fsc->sb = s;
849
850         s->s_op = &ceph_super_ops;
851         s->s_export_op = &ceph_export_ops;
852
853         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
854
855         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
856         if (ret != 0)
857                 goto fail;
858
859         return ret;
860
861 fail:
862         s->s_fs_info = NULL;
863         fsc->sb = NULL;
864         return ret;
865 }
866
867 /*
868  * share superblock if same fs AND options
869  */
870 static int ceph_compare_super(struct super_block *sb, void *data)
871 {
872         struct ceph_fs_client *new = data;
873         struct ceph_mount_options *fsopt = new->mount_options;
874         struct ceph_options *opt = new->client->options;
875         struct ceph_fs_client *other = ceph_sb_to_client(sb);
876
877         dout("ceph_compare_super %p\n", sb);
878
879         if (compare_mount_options(fsopt, opt, other)) {
880                 dout("monitor(s)/mount options don't match\n");
881                 return 0;
882         }
883         if ((opt->flags & CEPH_OPT_FSID) &&
884             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
885                 dout("fsid doesn't match\n");
886                 return 0;
887         }
888         if (fsopt->sb_flags != other->mount_options->sb_flags) {
889                 dout("flags differ\n");
890                 return 0;
891         }
892         return 1;
893 }
894
895 /*
896  * construct our own bdi so we can control readahead, etc.
897  */
898 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
899
900 static int ceph_register_bdi(struct super_block *sb,
901                              struct ceph_fs_client *fsc)
902 {
903         int err;
904
905         /* set ra_pages based on rasize mount option? */
906         if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
907                 fsc->backing_dev_info.ra_pages =
908                         (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
909                         >> PAGE_SHIFT;
910         else
911                 fsc->backing_dev_info.ra_pages =
912                         default_backing_dev_info.ra_pages;
913
914         err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
915                            atomic_long_inc_return(&bdi_seq));
916         if (!err)
917                 sb->s_bdi = &fsc->backing_dev_info;
918         return err;
919 }
920
921 static struct dentry *ceph_mount(struct file_system_type *fs_type,
922                        int flags, const char *dev_name, void *data)
923 {
924         struct super_block *sb;
925         struct ceph_fs_client *fsc;
926         struct dentry *res;
927         int err;
928         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
929         const char *path = NULL;
930         struct ceph_mount_options *fsopt = NULL;
931         struct ceph_options *opt = NULL;
932
933         dout("ceph_mount\n");
934
935 #ifdef CONFIG_CEPH_FS_POSIX_ACL
936         flags |= MS_POSIXACL;
937 #endif
938         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
939         if (err < 0) {
940                 res = ERR_PTR(err);
941                 goto out_final;
942         }
943
944         /* create client (which we may/may not use) */
945         fsc = create_fs_client(fsopt, opt);
946         if (IS_ERR(fsc)) {
947                 res = ERR_CAST(fsc);
948                 destroy_mount_options(fsopt);
949                 ceph_destroy_options(opt);
950                 goto out_final;
951         }
952
953         err = ceph_mdsc_init(fsc);
954         if (err < 0) {
955                 res = ERR_PTR(err);
956                 goto out;
957         }
958
959         if (ceph_test_opt(fsc->client, NOSHARE))
960                 compare_super = NULL;
961         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
962         if (IS_ERR(sb)) {
963                 res = ERR_CAST(sb);
964                 goto out;
965         }
966
967         if (ceph_sb_to_client(sb) != fsc) {
968                 ceph_mdsc_destroy(fsc);
969                 destroy_fs_client(fsc);
970                 fsc = ceph_sb_to_client(sb);
971                 dout("get_sb got existing client %p\n", fsc);
972         } else {
973                 dout("get_sb using new client %p\n", fsc);
974                 err = ceph_register_bdi(sb, fsc);
975                 if (err < 0) {
976                         res = ERR_PTR(err);
977                         goto out_splat;
978                 }
979         }
980
981         res = ceph_real_mount(fsc, path);
982         if (IS_ERR(res))
983                 goto out_splat;
984         dout("root %p inode %p ino %llx.%llx\n", res,
985              res->d_inode, ceph_vinop(res->d_inode));
986         return res;
987
988 out_splat:
989         ceph_mdsc_close_sessions(fsc->mdsc);
990         deactivate_locked_super(sb);
991         goto out_final;
992
993 out:
994         ceph_mdsc_destroy(fsc);
995         destroy_fs_client(fsc);
996 out_final:
997         dout("ceph_mount fail %ld\n", PTR_ERR(res));
998         return res;
999 }
1000
1001 static void ceph_kill_sb(struct super_block *s)
1002 {
1003         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1004         dout("kill_sb %p\n", s);
1005         ceph_mdsc_pre_umount(fsc->mdsc);
1006         kill_anon_super(s);    /* will call put_super after sb is r/o */
1007         ceph_mdsc_destroy(fsc);
1008         destroy_fs_client(fsc);
1009 }
1010
1011 static struct file_system_type ceph_fs_type = {
1012         .owner          = THIS_MODULE,
1013         .name           = "ceph",
1014         .mount          = ceph_mount,
1015         .kill_sb        = ceph_kill_sb,
1016         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1017 };
1018 MODULE_ALIAS_FS("ceph");
1019
1020 #define _STRINGIFY(x) #x
1021 #define STRINGIFY(x) _STRINGIFY(x)
1022
1023 static int __init init_ceph(void)
1024 {
1025         int ret = init_caches();
1026         if (ret)
1027                 goto out;
1028
1029         ceph_flock_init();
1030         ceph_xattr_init();
1031         ret = register_filesystem(&ceph_fs_type);
1032         if (ret)
1033                 goto out_icache;
1034
1035         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1036
1037         return 0;
1038
1039 out_icache:
1040         ceph_xattr_exit();
1041         destroy_caches();
1042 out:
1043         return ret;
1044 }
1045
1046 static void __exit exit_ceph(void)
1047 {
1048         dout("exit_ceph\n");
1049         unregister_filesystem(&ceph_fs_type);
1050         ceph_xattr_exit();
1051         destroy_caches();
1052 }
1053
1054 module_init(init_ceph);
1055 module_exit(exit_ceph);
1056
1057 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1058 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1059 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1060 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1061 MODULE_LICENSE("GPL");