b5ecd6f50360d53e0fe24c4ea79416722e93fc6c
[sfrench/cifs-2.6.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 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
46 {
47         struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
48         struct ceph_mon_client *monc = &fsc->client->monc;
49         struct ceph_statfs st;
50         u64 fsid;
51         int err;
52         u64 data_pool;
53
54         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
55                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
56         } else {
57                 data_pool = CEPH_NOPOOL;
58         }
59
60         dout("statfs\n");
61         err = ceph_monc_do_statfs(monc, data_pool, &st);
62         if (err < 0)
63                 return err;
64
65         /* fill in kstatfs */
66         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
67
68         /*
69          * express utilization in terms of large blocks to avoid
70          * overflow on 32-bit machines.
71          *
72          * NOTE: for the time being, we make bsize == frsize to humor
73          * not-yet-ancient versions of glibc that are broken.
74          * Someday, we will probably want to report a real block
75          * size...  whatever that may mean for a network file system!
76          */
77         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
78         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
79
80         /*
81          * By default use root quota for stats; fallback to overall filesystem
82          * usage if using 'noquotadf' mount option or if the root dir doesn't
83          * have max_bytes quota set.
84          */
85         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
86             !ceph_quota_update_statfs(fsc, buf)) {
87                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
88                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
89                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
90         }
91
92         buf->f_files = le64_to_cpu(st.num_objects);
93         buf->f_ffree = -1;
94         buf->f_namelen = NAME_MAX;
95
96         /* Must convert the fsid, for consistent values across arches */
97         mutex_lock(&monc->mutex);
98         fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
99                le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
100         mutex_unlock(&monc->mutex);
101
102         buf->f_fsid.val[0] = fsid & 0xffffffff;
103         buf->f_fsid.val[1] = fsid >> 32;
104
105         return 0;
106 }
107
108
109 static int ceph_sync_fs(struct super_block *sb, int wait)
110 {
111         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
112
113         if (!wait) {
114                 dout("sync_fs (non-blocking)\n");
115                 ceph_flush_dirty_caps(fsc->mdsc);
116                 dout("sync_fs (non-blocking) done\n");
117                 return 0;
118         }
119
120         dout("sync_fs (blocking)\n");
121         ceph_osdc_sync(&fsc->client->osdc);
122         ceph_mdsc_sync(fsc->mdsc);
123         dout("sync_fs (blocking) done\n");
124         return 0;
125 }
126
127 /*
128  * mount options
129  */
130 enum {
131         Opt_wsize,
132         Opt_rsize,
133         Opt_rasize,
134         Opt_caps_wanted_delay_min,
135         Opt_caps_wanted_delay_max,
136         Opt_readdir_max_entries,
137         Opt_readdir_max_bytes,
138         Opt_congestion_kb,
139         Opt_last_int,
140         /* int args above */
141         Opt_snapdirname,
142         Opt_mds_namespace,
143         Opt_fscache_uniq,
144         Opt_last_string,
145         /* string args above */
146         Opt_dirstat,
147         Opt_nodirstat,
148         Opt_rbytes,
149         Opt_norbytes,
150         Opt_asyncreaddir,
151         Opt_noasyncreaddir,
152         Opt_dcache,
153         Opt_nodcache,
154         Opt_ino32,
155         Opt_noino32,
156         Opt_fscache,
157         Opt_nofscache,
158         Opt_poolperm,
159         Opt_nopoolperm,
160         Opt_require_active_mds,
161         Opt_norequire_active_mds,
162 #ifdef CONFIG_CEPH_FS_POSIX_ACL
163         Opt_acl,
164 #endif
165         Opt_noacl,
166         Opt_quotadf,
167         Opt_noquotadf,
168         Opt_copyfrom,
169         Opt_nocopyfrom,
170 };
171
172 static match_table_t fsopt_tokens = {
173         {Opt_wsize, "wsize=%d"},
174         {Opt_rsize, "rsize=%d"},
175         {Opt_rasize, "rasize=%d"},
176         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
177         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
178         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
179         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
180         {Opt_congestion_kb, "write_congestion_kb=%d"},
181         /* int args above */
182         {Opt_snapdirname, "snapdirname=%s"},
183         {Opt_mds_namespace, "mds_namespace=%s"},
184         {Opt_fscache_uniq, "fsc=%s"},
185         /* string args above */
186         {Opt_dirstat, "dirstat"},
187         {Opt_nodirstat, "nodirstat"},
188         {Opt_rbytes, "rbytes"},
189         {Opt_norbytes, "norbytes"},
190         {Opt_asyncreaddir, "asyncreaddir"},
191         {Opt_noasyncreaddir, "noasyncreaddir"},
192         {Opt_dcache, "dcache"},
193         {Opt_nodcache, "nodcache"},
194         {Opt_ino32, "ino32"},
195         {Opt_noino32, "noino32"},
196         {Opt_fscache, "fsc"},
197         {Opt_nofscache, "nofsc"},
198         {Opt_poolperm, "poolperm"},
199         {Opt_nopoolperm, "nopoolperm"},
200         {Opt_require_active_mds, "require_active_mds"},
201         {Opt_norequire_active_mds, "norequire_active_mds"},
202 #ifdef CONFIG_CEPH_FS_POSIX_ACL
203         {Opt_acl, "acl"},
204 #endif
205         {Opt_noacl, "noacl"},
206         {Opt_quotadf, "quotadf"},
207         {Opt_noquotadf, "noquotadf"},
208         {Opt_copyfrom, "copyfrom"},
209         {Opt_nocopyfrom, "nocopyfrom"},
210         {-1, NULL}
211 };
212
213 static int parse_fsopt_token(char *c, void *private)
214 {
215         struct ceph_mount_options *fsopt = private;
216         substring_t argstr[MAX_OPT_ARGS];
217         int token, intval, ret;
218
219         token = match_token((char *)c, fsopt_tokens, argstr);
220         if (token < 0)
221                 return -EINVAL;
222
223         if (token < Opt_last_int) {
224                 ret = match_int(&argstr[0], &intval);
225                 if (ret < 0) {
226                         pr_err("bad option arg (not int) at '%s'\n", c);
227                         return ret;
228                 }
229                 dout("got int token %d val %d\n", token, intval);
230         } else if (token > Opt_last_int && token < Opt_last_string) {
231                 dout("got string token %d val %s\n", token,
232                      argstr[0].from);
233         } else {
234                 dout("got token %d\n", token);
235         }
236
237         switch (token) {
238         case Opt_snapdirname:
239                 kfree(fsopt->snapdir_name);
240                 fsopt->snapdir_name = kstrndup(argstr[0].from,
241                                                argstr[0].to-argstr[0].from,
242                                                GFP_KERNEL);
243                 if (!fsopt->snapdir_name)
244                         return -ENOMEM;
245                 break;
246         case Opt_mds_namespace:
247                 kfree(fsopt->mds_namespace);
248                 fsopt->mds_namespace = kstrndup(argstr[0].from,
249                                                 argstr[0].to-argstr[0].from,
250                                                 GFP_KERNEL);
251                 if (!fsopt->mds_namespace)
252                         return -ENOMEM;
253                 break;
254         case Opt_fscache_uniq:
255                 kfree(fsopt->fscache_uniq);
256                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
257                                                argstr[0].to-argstr[0].from,
258                                                GFP_KERNEL);
259                 if (!fsopt->fscache_uniq)
260                         return -ENOMEM;
261                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
262                 break;
263                 /* misc */
264         case Opt_wsize:
265                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
266                         return -EINVAL;
267                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
268                 break;
269         case Opt_rsize:
270                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
271                         return -EINVAL;
272                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
273                 break;
274         case Opt_rasize:
275                 if (intval < 0)
276                         return -EINVAL;
277                 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
278                 break;
279         case Opt_caps_wanted_delay_min:
280                 if (intval < 1)
281                         return -EINVAL;
282                 fsopt->caps_wanted_delay_min = intval;
283                 break;
284         case Opt_caps_wanted_delay_max:
285                 if (intval < 1)
286                         return -EINVAL;
287                 fsopt->caps_wanted_delay_max = intval;
288                 break;
289         case Opt_readdir_max_entries:
290                 if (intval < 1)
291                         return -EINVAL;
292                 fsopt->max_readdir = intval;
293                 break;
294         case Opt_readdir_max_bytes:
295                 if (intval < (int)PAGE_SIZE && intval != 0)
296                         return -EINVAL;
297                 fsopt->max_readdir_bytes = intval;
298                 break;
299         case Opt_congestion_kb:
300                 if (intval < 1024) /* at least 1M */
301                         return -EINVAL;
302                 fsopt->congestion_kb = intval;
303                 break;
304         case Opt_dirstat:
305                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
306                 break;
307         case Opt_nodirstat:
308                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
309                 break;
310         case Opt_rbytes:
311                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
312                 break;
313         case Opt_norbytes:
314                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
315                 break;
316         case Opt_asyncreaddir:
317                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
318                 break;
319         case Opt_noasyncreaddir:
320                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
321                 break;
322         case Opt_dcache:
323                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
324                 break;
325         case Opt_nodcache:
326                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
327                 break;
328         case Opt_ino32:
329                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
330                 break;
331         case Opt_noino32:
332                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
333                 break;
334         case Opt_fscache:
335                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
336                 kfree(fsopt->fscache_uniq);
337                 fsopt->fscache_uniq = NULL;
338                 break;
339         case Opt_nofscache:
340                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
341                 kfree(fsopt->fscache_uniq);
342                 fsopt->fscache_uniq = NULL;
343                 break;
344         case Opt_poolperm:
345                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
346                 break;
347         case Opt_nopoolperm:
348                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
349                 break;
350         case Opt_require_active_mds:
351                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
352                 break;
353         case Opt_norequire_active_mds:
354                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
355                 break;
356         case Opt_quotadf:
357                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
358                 break;
359         case Opt_noquotadf:
360                 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
361                 break;
362         case Opt_copyfrom:
363                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
364                 break;
365         case Opt_nocopyfrom:
366                 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
367                 break;
368 #ifdef CONFIG_CEPH_FS_POSIX_ACL
369         case Opt_acl:
370                 fsopt->sb_flags |= SB_POSIXACL;
371                 break;
372 #endif
373         case Opt_noacl:
374                 fsopt->sb_flags &= ~SB_POSIXACL;
375                 break;
376         default:
377                 BUG_ON(token);
378         }
379         return 0;
380 }
381
382 static void destroy_mount_options(struct ceph_mount_options *args)
383 {
384         dout("destroy_mount_options %p\n", args);
385         kfree(args->snapdir_name);
386         kfree(args->mds_namespace);
387         kfree(args->server_path);
388         kfree(args->fscache_uniq);
389         kfree(args);
390 }
391
392 static int strcmp_null(const char *s1, const char *s2)
393 {
394         if (!s1 && !s2)
395                 return 0;
396         if (s1 && !s2)
397                 return -1;
398         if (!s1 && s2)
399                 return 1;
400         return strcmp(s1, s2);
401 }
402
403 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
404                                  struct ceph_options *new_opt,
405                                  struct ceph_fs_client *fsc)
406 {
407         struct ceph_mount_options *fsopt1 = new_fsopt;
408         struct ceph_mount_options *fsopt2 = fsc->mount_options;
409         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
410         int ret;
411
412         ret = memcmp(fsopt1, fsopt2, ofs);
413         if (ret)
414                 return ret;
415
416         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
417         if (ret)
418                 return ret;
419         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
420         if (ret)
421                 return ret;
422         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
423         if (ret)
424                 return ret;
425         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
426         if (ret)
427                 return ret;
428
429         return ceph_compare_options(new_opt, fsc->client);
430 }
431
432 static int parse_mount_options(struct ceph_mount_options **pfsopt,
433                                struct ceph_options **popt,
434                                int flags, char *options,
435                                const char *dev_name)
436 {
437         struct ceph_mount_options *fsopt;
438         const char *dev_name_end;
439         int err;
440
441         if (!dev_name || !*dev_name)
442                 return -EINVAL;
443
444         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
445         if (!fsopt)
446                 return -ENOMEM;
447
448         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
449
450         fsopt->sb_flags = flags;
451         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
452
453         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
454         fsopt->rsize = CEPH_MAX_READ_SIZE;
455         fsopt->rasize = CEPH_RASIZE_DEFAULT;
456         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
457         if (!fsopt->snapdir_name) {
458                 err = -ENOMEM;
459                 goto out;
460         }
461
462         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
463         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
464         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
465         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
466         fsopt->congestion_kb = default_congestion_kb();
467
468         /*
469          * Distinguish the server list from the path in "dev_name".
470          * Internally we do not include the leading '/' in the path.
471          *
472          * "dev_name" will look like:
473          *     <server_spec>[,<server_spec>...]:[<path>]
474          * where
475          *     <server_spec> is <ip>[:<port>]
476          *     <path> is optional, but if present must begin with '/'
477          */
478         dev_name_end = strchr(dev_name, '/');
479         if (dev_name_end) {
480                 if (strlen(dev_name_end) > 1) {
481                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
482                         if (!fsopt->server_path) {
483                                 err = -ENOMEM;
484                                 goto out;
485                         }
486                 }
487         } else {
488                 dev_name_end = dev_name + strlen(dev_name);
489         }
490         err = -EINVAL;
491         dev_name_end--;         /* back up to ':' separator */
492         if (dev_name_end < dev_name || *dev_name_end != ':') {
493                 pr_err("device name is missing path (no : separator in %s)\n",
494                                 dev_name);
495                 goto out;
496         }
497         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
498         if (fsopt->server_path)
499                 dout("server path '%s'\n", fsopt->server_path);
500
501         *popt = ceph_parse_options(options, dev_name, dev_name_end,
502                                  parse_fsopt_token, (void *)fsopt);
503         if (IS_ERR(*popt)) {
504                 err = PTR_ERR(*popt);
505                 goto out;
506         }
507
508         /* success */
509         *pfsopt = fsopt;
510         return 0;
511
512 out:
513         destroy_mount_options(fsopt);
514         return err;
515 }
516
517 /**
518  * ceph_show_options - Show mount options in /proc/mounts
519  * @m: seq_file to write to
520  * @root: root of that (sub)tree
521  */
522 static int ceph_show_options(struct seq_file *m, struct dentry *root)
523 {
524         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
525         struct ceph_mount_options *fsopt = fsc->mount_options;
526         size_t pos;
527         int ret;
528
529         /* a comma between MNT/MS and client options */
530         seq_putc(m, ',');
531         pos = m->count;
532
533         ret = ceph_print_client_options(m, fsc->client);
534         if (ret)
535                 return ret;
536
537         /* retract our comma if no client options */
538         if (m->count == pos)
539                 m->count--;
540
541         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
542                 seq_puts(m, ",dirstat");
543         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
544                 seq_puts(m, ",rbytes");
545         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
546                 seq_puts(m, ",noasyncreaddir");
547         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
548                 seq_puts(m, ",nodcache");
549         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
550                 seq_puts(m, ",ino32");
551         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
552                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
553         }
554         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
555                 seq_puts(m, ",nopoolperm");
556         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
557                 seq_puts(m, ",noquotadf");
558
559 #ifdef CONFIG_CEPH_FS_POSIX_ACL
560         if (fsopt->sb_flags & SB_POSIXACL)
561                 seq_puts(m, ",acl");
562         else
563                 seq_puts(m, ",noacl");
564 #endif
565
566         if (fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM)
567                 seq_puts(m, ",nocopyfrom");
568
569         if (fsopt->mds_namespace)
570                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
571         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
572                 seq_printf(m, ",wsize=%d", fsopt->wsize);
573         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
574                 seq_printf(m, ",rsize=%d", fsopt->rsize);
575         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
576                 seq_printf(m, ",rasize=%d", fsopt->rasize);
577         if (fsopt->congestion_kb != default_congestion_kb())
578                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
579         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
580                 seq_printf(m, ",caps_wanted_delay_min=%d",
581                          fsopt->caps_wanted_delay_min);
582         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
583                 seq_printf(m, ",caps_wanted_delay_max=%d",
584                            fsopt->caps_wanted_delay_max);
585         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
586                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
587         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
588                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
589         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
590                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
591
592         return 0;
593 }
594
595 /*
596  * handle any mon messages the standard library doesn't understand.
597  * return error if we don't either.
598  */
599 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
600 {
601         struct ceph_fs_client *fsc = client->private;
602         int type = le16_to_cpu(msg->hdr.type);
603
604         switch (type) {
605         case CEPH_MSG_MDS_MAP:
606                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
607                 return 0;
608         case CEPH_MSG_FS_MAP_USER:
609                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
610                 return 0;
611         default:
612                 return -1;
613         }
614 }
615
616 /*
617  * create a new fs client
618  *
619  * Success or not, this function consumes @fsopt and @opt.
620  */
621 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
622                                         struct ceph_options *opt)
623 {
624         struct ceph_fs_client *fsc;
625         int page_count;
626         size_t size;
627         int err;
628
629         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
630         if (!fsc) {
631                 err = -ENOMEM;
632                 goto fail;
633         }
634
635         fsc->client = ceph_create_client(opt, fsc);
636         if (IS_ERR(fsc->client)) {
637                 err = PTR_ERR(fsc->client);
638                 goto fail;
639         }
640         opt = NULL; /* fsc->client now owns this */
641
642         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
643         fsc->client->osdc.abort_on_full = true;
644
645         if (!fsopt->mds_namespace) {
646                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
647                                    0, true);
648         } else {
649                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
650                                    0, false);
651         }
652
653         fsc->mount_options = fsopt;
654
655         fsc->sb = NULL;
656         fsc->mount_state = CEPH_MOUNT_MOUNTING;
657
658         atomic_long_set(&fsc->writeback_count, 0);
659
660         err = -ENOMEM;
661         /*
662          * The number of concurrent works can be high but they don't need
663          * to be processed in parallel, limit concurrency.
664          */
665         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
666         if (!fsc->wb_wq)
667                 goto fail_client;
668         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
669         if (!fsc->pg_inv_wq)
670                 goto fail_wb_wq;
671         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
672         if (!fsc->trunc_wq)
673                 goto fail_pg_inv_wq;
674
675         /* set up mempools */
676         err = -ENOMEM;
677         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
678         size = sizeof (struct page *) * (page_count ? page_count : 1);
679         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
680         if (!fsc->wb_pagevec_pool)
681                 goto fail_trunc_wq;
682
683         /* caps */
684         fsc->min_caps = fsopt->max_readdir;
685
686         return fsc;
687
688 fail_trunc_wq:
689         destroy_workqueue(fsc->trunc_wq);
690 fail_pg_inv_wq:
691         destroy_workqueue(fsc->pg_inv_wq);
692 fail_wb_wq:
693         destroy_workqueue(fsc->wb_wq);
694 fail_client:
695         ceph_destroy_client(fsc->client);
696 fail:
697         kfree(fsc);
698         if (opt)
699                 ceph_destroy_options(opt);
700         destroy_mount_options(fsopt);
701         return ERR_PTR(err);
702 }
703
704 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
705 {
706         flush_workqueue(fsc->wb_wq);
707         flush_workqueue(fsc->pg_inv_wq);
708         flush_workqueue(fsc->trunc_wq);
709 }
710
711 static void destroy_fs_client(struct ceph_fs_client *fsc)
712 {
713         dout("destroy_fs_client %p\n", fsc);
714
715         destroy_workqueue(fsc->wb_wq);
716         destroy_workqueue(fsc->pg_inv_wq);
717         destroy_workqueue(fsc->trunc_wq);
718
719         mempool_destroy(fsc->wb_pagevec_pool);
720
721         destroy_mount_options(fsc->mount_options);
722
723         ceph_destroy_client(fsc->client);
724
725         kfree(fsc);
726         dout("destroy_fs_client %p done\n", fsc);
727 }
728
729 /*
730  * caches
731  */
732 struct kmem_cache *ceph_inode_cachep;
733 struct kmem_cache *ceph_cap_cachep;
734 struct kmem_cache *ceph_cap_flush_cachep;
735 struct kmem_cache *ceph_dentry_cachep;
736 struct kmem_cache *ceph_file_cachep;
737 struct kmem_cache *ceph_dir_file_cachep;
738
739 static void ceph_inode_init_once(void *foo)
740 {
741         struct ceph_inode_info *ci = foo;
742         inode_init_once(&ci->vfs_inode);
743 }
744
745 static int __init init_caches(void)
746 {
747         int error = -ENOMEM;
748
749         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
750                                       sizeof(struct ceph_inode_info),
751                                       __alignof__(struct ceph_inode_info),
752                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
753                                       SLAB_ACCOUNT, ceph_inode_init_once);
754         if (!ceph_inode_cachep)
755                 return -ENOMEM;
756
757         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
758         if (!ceph_cap_cachep)
759                 goto bad_cap;
760         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
761                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
762         if (!ceph_cap_flush_cachep)
763                 goto bad_cap_flush;
764
765         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
766                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
767         if (!ceph_dentry_cachep)
768                 goto bad_dentry;
769
770         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
771         if (!ceph_file_cachep)
772                 goto bad_file;
773
774         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
775         if (!ceph_dir_file_cachep)
776                 goto bad_dir_file;
777
778         error = ceph_fscache_register();
779         if (error)
780                 goto bad_fscache;
781
782         return 0;
783
784 bad_fscache:
785         kmem_cache_destroy(ceph_dir_file_cachep);
786 bad_dir_file:
787         kmem_cache_destroy(ceph_file_cachep);
788 bad_file:
789         kmem_cache_destroy(ceph_dentry_cachep);
790 bad_dentry:
791         kmem_cache_destroy(ceph_cap_flush_cachep);
792 bad_cap_flush:
793         kmem_cache_destroy(ceph_cap_cachep);
794 bad_cap:
795         kmem_cache_destroy(ceph_inode_cachep);
796         return error;
797 }
798
799 static void destroy_caches(void)
800 {
801         /*
802          * Make sure all delayed rcu free inodes are flushed before we
803          * destroy cache.
804          */
805         rcu_barrier();
806
807         kmem_cache_destroy(ceph_inode_cachep);
808         kmem_cache_destroy(ceph_cap_cachep);
809         kmem_cache_destroy(ceph_cap_flush_cachep);
810         kmem_cache_destroy(ceph_dentry_cachep);
811         kmem_cache_destroy(ceph_file_cachep);
812         kmem_cache_destroy(ceph_dir_file_cachep);
813
814         ceph_fscache_unregister();
815 }
816
817
818 /*
819  * ceph_umount_begin - initiate forced umount.  Tear down down the
820  * mount, skipping steps that may hang while waiting for server(s).
821  */
822 static void ceph_umount_begin(struct super_block *sb)
823 {
824         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
825
826         dout("ceph_umount_begin - starting forced umount\n");
827         if (!fsc)
828                 return;
829         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
830         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
831         ceph_mdsc_force_umount(fsc->mdsc);
832         return;
833 }
834
835 static const struct super_operations ceph_super_ops = {
836         .alloc_inode    = ceph_alloc_inode,
837         .destroy_inode  = ceph_destroy_inode,
838         .write_inode    = ceph_write_inode,
839         .drop_inode     = ceph_drop_inode,
840         .sync_fs        = ceph_sync_fs,
841         .put_super      = ceph_put_super,
842         .show_options   = ceph_show_options,
843         .statfs         = ceph_statfs,
844         .umount_begin   = ceph_umount_begin,
845 };
846
847 /*
848  * Bootstrap mount by opening the root directory.  Note the mount
849  * @started time from caller, and time out if this takes too long.
850  */
851 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
852                                        const char *path,
853                                        unsigned long started)
854 {
855         struct ceph_mds_client *mdsc = fsc->mdsc;
856         struct ceph_mds_request *req = NULL;
857         int err;
858         struct dentry *root;
859
860         /* open dir */
861         dout("open_root_inode opening '%s'\n", path);
862         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
863         if (IS_ERR(req))
864                 return ERR_CAST(req);
865         req->r_path1 = kstrdup(path, GFP_NOFS);
866         if (!req->r_path1) {
867                 root = ERR_PTR(-ENOMEM);
868                 goto out;
869         }
870
871         req->r_ino1.ino = CEPH_INO_ROOT;
872         req->r_ino1.snap = CEPH_NOSNAP;
873         req->r_started = started;
874         req->r_timeout = fsc->client->options->mount_timeout;
875         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
876         req->r_num_caps = 2;
877         err = ceph_mdsc_do_request(mdsc, NULL, req);
878         if (err == 0) {
879                 struct inode *inode = req->r_target_inode;
880                 req->r_target_inode = NULL;
881                 dout("open_root_inode success\n");
882                 root = d_make_root(inode);
883                 if (!root) {
884                         root = ERR_PTR(-ENOMEM);
885                         goto out;
886                 }
887                 dout("open_root_inode success, root dentry is %p\n", root);
888         } else {
889                 root = ERR_PTR(err);
890         }
891 out:
892         ceph_mdsc_put_request(req);
893         return root;
894 }
895
896
897
898
899 /*
900  * mount: join the ceph cluster, and open root directory.
901  */
902 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
903 {
904         int err;
905         unsigned long started = jiffies;  /* note the start time */
906         struct dentry *root;
907
908         dout("mount start %p\n", fsc);
909         mutex_lock(&fsc->client->mount_mutex);
910
911         if (!fsc->sb->s_root) {
912                 const char *path;
913                 err = __ceph_open_session(fsc->client, started);
914                 if (err < 0)
915                         goto out;
916
917                 /* setup fscache */
918                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
919                         err = ceph_fscache_register_fs(fsc);
920                         if (err < 0)
921                                 goto out;
922                 }
923
924                 if (!fsc->mount_options->server_path) {
925                         path = "";
926                         dout("mount opening path \\t\n");
927                 } else {
928                         path = fsc->mount_options->server_path + 1;
929                         dout("mount opening path %s\n", path);
930                 }
931
932                 err = ceph_fs_debugfs_init(fsc);
933                 if (err < 0)
934                         goto out;
935
936                 root = open_root_dentry(fsc, path, started);
937                 if (IS_ERR(root)) {
938                         err = PTR_ERR(root);
939                         goto out;
940                 }
941                 fsc->sb->s_root = dget(root);
942         } else {
943                 root = dget(fsc->sb->s_root);
944         }
945
946         fsc->mount_state = CEPH_MOUNT_MOUNTED;
947         dout("mount success\n");
948         mutex_unlock(&fsc->client->mount_mutex);
949         return root;
950
951 out:
952         mutex_unlock(&fsc->client->mount_mutex);
953         return ERR_PTR(err);
954 }
955
956 static int ceph_set_super(struct super_block *s, void *data)
957 {
958         struct ceph_fs_client *fsc = data;
959         int ret;
960
961         dout("set_super %p data %p\n", s, data);
962
963         s->s_flags = fsc->mount_options->sb_flags;
964         s->s_maxbytes = MAX_LFS_FILESIZE;
965
966         s->s_xattr = ceph_xattr_handlers;
967         s->s_fs_info = fsc;
968         fsc->sb = s;
969         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
970
971         s->s_op = &ceph_super_ops;
972         s->s_d_op = &ceph_dentry_ops;
973         s->s_export_op = &ceph_export_ops;
974
975         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
976
977         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
978         if (ret != 0)
979                 goto fail;
980
981         return ret;
982
983 fail:
984         s->s_fs_info = NULL;
985         fsc->sb = NULL;
986         return ret;
987 }
988
989 /*
990  * share superblock if same fs AND options
991  */
992 static int ceph_compare_super(struct super_block *sb, void *data)
993 {
994         struct ceph_fs_client *new = data;
995         struct ceph_mount_options *fsopt = new->mount_options;
996         struct ceph_options *opt = new->client->options;
997         struct ceph_fs_client *other = ceph_sb_to_client(sb);
998
999         dout("ceph_compare_super %p\n", sb);
1000
1001         if (compare_mount_options(fsopt, opt, other)) {
1002                 dout("monitor(s)/mount options don't match\n");
1003                 return 0;
1004         }
1005         if ((opt->flags & CEPH_OPT_FSID) &&
1006             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1007                 dout("fsid doesn't match\n");
1008                 return 0;
1009         }
1010         if (fsopt->sb_flags != other->mount_options->sb_flags) {
1011                 dout("flags differ\n");
1012                 return 0;
1013         }
1014         return 1;
1015 }
1016
1017 /*
1018  * construct our own bdi so we can control readahead, etc.
1019  */
1020 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1021
1022 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1023 {
1024         int err;
1025
1026         err = super_setup_bdi_name(sb, "ceph-%ld",
1027                                    atomic_long_inc_return(&bdi_seq));
1028         if (err)
1029                 return err;
1030
1031         /* set ra_pages based on rasize mount option? */
1032         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1033
1034         /* set io_pages based on max osd read size */
1035         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1036
1037         return 0;
1038 }
1039
1040 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1041                        int flags, const char *dev_name, void *data)
1042 {
1043         struct super_block *sb;
1044         struct ceph_fs_client *fsc;
1045         struct dentry *res;
1046         int err;
1047         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1048         struct ceph_mount_options *fsopt = NULL;
1049         struct ceph_options *opt = NULL;
1050
1051         dout("ceph_mount\n");
1052
1053 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1054         flags |= SB_POSIXACL;
1055 #endif
1056         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1057         if (err < 0) {
1058                 res = ERR_PTR(err);
1059                 goto out_final;
1060         }
1061
1062         /* create client (which we may/may not use) */
1063         fsc = create_fs_client(fsopt, opt);
1064         if (IS_ERR(fsc)) {
1065                 res = ERR_CAST(fsc);
1066                 goto out_final;
1067         }
1068
1069         err = ceph_mdsc_init(fsc);
1070         if (err < 0) {
1071                 res = ERR_PTR(err);
1072                 goto out;
1073         }
1074
1075         if (ceph_test_opt(fsc->client, NOSHARE))
1076                 compare_super = NULL;
1077         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1078         if (IS_ERR(sb)) {
1079                 res = ERR_CAST(sb);
1080                 goto out;
1081         }
1082
1083         if (ceph_sb_to_client(sb) != fsc) {
1084                 ceph_mdsc_destroy(fsc);
1085                 destroy_fs_client(fsc);
1086                 fsc = ceph_sb_to_client(sb);
1087                 dout("get_sb got existing client %p\n", fsc);
1088         } else {
1089                 dout("get_sb using new client %p\n", fsc);
1090                 err = ceph_setup_bdi(sb, fsc);
1091                 if (err < 0) {
1092                         res = ERR_PTR(err);
1093                         goto out_splat;
1094                 }
1095         }
1096
1097         res = ceph_real_mount(fsc);
1098         if (IS_ERR(res))
1099                 goto out_splat;
1100         dout("root %p inode %p ino %llx.%llx\n", res,
1101              d_inode(res), ceph_vinop(d_inode(res)));
1102         return res;
1103
1104 out_splat:
1105         ceph_mdsc_close_sessions(fsc->mdsc);
1106         deactivate_locked_super(sb);
1107         goto out_final;
1108
1109 out:
1110         ceph_mdsc_destroy(fsc);
1111         destroy_fs_client(fsc);
1112 out_final:
1113         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1114         return res;
1115 }
1116
1117 static void ceph_kill_sb(struct super_block *s)
1118 {
1119         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1120         dev_t dev = s->s_dev;
1121
1122         dout("kill_sb %p\n", s);
1123
1124         ceph_mdsc_pre_umount(fsc->mdsc);
1125         flush_fs_workqueues(fsc);
1126
1127         generic_shutdown_super(s);
1128
1129         fsc->client->extra_mon_dispatch = NULL;
1130         ceph_fs_debugfs_cleanup(fsc);
1131
1132         ceph_fscache_unregister_fs(fsc);
1133
1134         ceph_mdsc_destroy(fsc);
1135
1136         destroy_fs_client(fsc);
1137         free_anon_bdev(dev);
1138 }
1139
1140 static struct file_system_type ceph_fs_type = {
1141         .owner          = THIS_MODULE,
1142         .name           = "ceph",
1143         .mount          = ceph_mount,
1144         .kill_sb        = ceph_kill_sb,
1145         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1146 };
1147 MODULE_ALIAS_FS("ceph");
1148
1149 static int __init init_ceph(void)
1150 {
1151         int ret = init_caches();
1152         if (ret)
1153                 goto out;
1154
1155         ceph_flock_init();
1156         ceph_xattr_init();
1157         ret = register_filesystem(&ceph_fs_type);
1158         if (ret)
1159                 goto out_xattr;
1160
1161         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1162
1163         return 0;
1164
1165 out_xattr:
1166         ceph_xattr_exit();
1167         destroy_caches();
1168 out:
1169         return ret;
1170 }
1171
1172 static void __exit exit_ceph(void)
1173 {
1174         dout("exit_ceph\n");
1175         unregister_filesystem(&ceph_fs_type);
1176         ceph_xattr_exit();
1177         destroy_caches();
1178 }
1179
1180 module_init(init_ceph);
1181 module_exit(exit_ceph);
1182
1183 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1184 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1185 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1186 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1187 MODULE_LICENSE("GPL");