ceph: should use deactivate_locked_super() on failure exits
[linux-2.6.git] / fs / ceph / super.c
1
2 #include "ceph_debug.h"
3
4 #include <linux/backing-dev.h>
5 #include <linux/fs.h>
6 #include <linux/inet.h>
7 #include <linux/in6.h>
8 #include <linux/module.h>
9 #include <linux/mount.h>
10 #include <linux/parser.h>
11 #include <linux/rwsem.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 #include <linux/version.h>
18 #include <linux/vmalloc.h>
19
20 #include "decode.h"
21 #include "super.h"
22 #include "mon_client.h"
23 #include "auth.h"
24
25 /*
26  * Ceph superblock operations
27  *
28  * Handle the basics of mounting, unmounting.
29  */
30
31
32 /*
33  * find filename portion of a path (/foo/bar/baz -> baz)
34  */
35 const char *ceph_file_part(const char *s, int len)
36 {
37         const char *e = s + len;
38
39         while (e != s && *(e-1) != '/')
40                 e--;
41         return e;
42 }
43
44
45 /*
46  * super ops
47  */
48 static void ceph_put_super(struct super_block *s)
49 {
50         struct ceph_client *client = ceph_sb_to_client(s);
51
52         dout("put_super\n");
53         ceph_mdsc_close_sessions(&client->mdsc);
54
55         /*
56          * ensure we release the bdi before put_anon_super releases
57          * the device name.
58          */
59         if (s->s_bdi == &client->backing_dev_info) {
60                 bdi_unregister(&client->backing_dev_info);
61                 s->s_bdi = NULL;
62         }
63
64         return;
65 }
66
67 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
68 {
69         struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
70         struct ceph_monmap *monmap = client->monc.monmap;
71         struct ceph_statfs st;
72         u64 fsid;
73         int err;
74
75         dout("statfs\n");
76         err = ceph_monc_do_statfs(&client->monc, &st);
77         if (err < 0)
78                 return err;
79
80         /* fill in kstatfs */
81         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
82
83         /*
84          * express utilization in terms of large blocks to avoid
85          * overflow on 32-bit machines.
86          */
87         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
88         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
89         buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
90                 (CEPH_BLOCK_SHIFT-10);
91         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
92
93         buf->f_files = le64_to_cpu(st.num_objects);
94         buf->f_ffree = -1;
95         buf->f_namelen = PATH_MAX;
96         buf->f_frsize = PAGE_CACHE_SIZE;
97
98         /* leave fsid little-endian, regardless of host endianness */
99         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
100         buf->f_fsid.val[0] = fsid & 0xffffffff;
101         buf->f_fsid.val[1] = fsid >> 32;
102
103         return 0;
104 }
105
106
107 static int ceph_syncfs(struct super_block *sb, int wait)
108 {
109         dout("sync_fs %d\n", wait);
110         ceph_osdc_sync(&ceph_client(sb)->osdc);
111         ceph_mdsc_sync(&ceph_client(sb)->mdsc);
112         dout("sync_fs %d done\n", wait);
113         return 0;
114 }
115
116
117 /**
118  * ceph_show_options - Show mount options in /proc/mounts
119  * @m: seq_file to write to
120  * @mnt: mount descriptor
121  */
122 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
123 {
124         struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
125         struct ceph_mount_args *args = client->mount_args;
126
127         if (args->flags & CEPH_OPT_FSID)
128                 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
129                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
130                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
131         if (args->flags & CEPH_OPT_NOSHARE)
132                 seq_puts(m, ",noshare");
133         if (args->flags & CEPH_OPT_DIRSTAT)
134                 seq_puts(m, ",dirstat");
135         if ((args->flags & CEPH_OPT_RBYTES) == 0)
136                 seq_puts(m, ",norbytes");
137         if (args->flags & CEPH_OPT_NOCRC)
138                 seq_puts(m, ",nocrc");
139         if (args->flags & CEPH_OPT_NOASYNCREADDIR)
140                 seq_puts(m, ",noasyncreaddir");
141         if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
142                 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
143         if (args->name)
144                 seq_printf(m, ",name=%s", args->name);
145         if (args->secret)
146                 seq_puts(m, ",secret=<hidden>");
147         return 0;
148 }
149
150 /*
151  * caches
152  */
153 struct kmem_cache *ceph_inode_cachep;
154 struct kmem_cache *ceph_cap_cachep;
155 struct kmem_cache *ceph_dentry_cachep;
156 struct kmem_cache *ceph_file_cachep;
157
158 static void ceph_inode_init_once(void *foo)
159 {
160         struct ceph_inode_info *ci = foo;
161         inode_init_once(&ci->vfs_inode);
162 }
163
164 static int default_congestion_kb(void)
165 {
166         int congestion_kb;
167
168         /*
169          * Copied from NFS
170          *
171          * congestion size, scale with available memory.
172          *
173          *  64MB:    8192k
174          * 128MB:   11585k
175          * 256MB:   16384k
176          * 512MB:   23170k
177          *   1GB:   32768k
178          *   2GB:   46340k
179          *   4GB:   65536k
180          *   8GB:   92681k
181          *  16GB:  131072k
182          *
183          * This allows larger machines to have larger/more transfers.
184          * Limit the default to 256M
185          */
186         congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
187         if (congestion_kb > 256*1024)
188                 congestion_kb = 256*1024;
189
190         return congestion_kb;
191 }
192
193 static int __init init_caches(void)
194 {
195         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
196                                       sizeof(struct ceph_inode_info),
197                                       __alignof__(struct ceph_inode_info),
198                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
199                                       ceph_inode_init_once);
200         if (ceph_inode_cachep == NULL)
201                 return -ENOMEM;
202
203         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
204                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
205         if (ceph_cap_cachep == NULL)
206                 goto bad_cap;
207
208         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
209                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
210         if (ceph_dentry_cachep == NULL)
211                 goto bad_dentry;
212
213         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
214                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
215         if (ceph_file_cachep == NULL)
216                 goto bad_file;
217
218         return 0;
219
220 bad_file:
221         kmem_cache_destroy(ceph_dentry_cachep);
222 bad_dentry:
223         kmem_cache_destroy(ceph_cap_cachep);
224 bad_cap:
225         kmem_cache_destroy(ceph_inode_cachep);
226         return -ENOMEM;
227 }
228
229 static void destroy_caches(void)
230 {
231         kmem_cache_destroy(ceph_inode_cachep);
232         kmem_cache_destroy(ceph_cap_cachep);
233         kmem_cache_destroy(ceph_dentry_cachep);
234         kmem_cache_destroy(ceph_file_cachep);
235 }
236
237
238 /*
239  * ceph_umount_begin - initiate forced umount.  Tear down down the
240  * mount, skipping steps that may hang while waiting for server(s).
241  */
242 static void ceph_umount_begin(struct super_block *sb)
243 {
244         struct ceph_client *client = ceph_sb_to_client(sb);
245
246         dout("ceph_umount_begin - starting forced umount\n");
247         if (!client)
248                 return;
249         client->mount_state = CEPH_MOUNT_SHUTDOWN;
250         return;
251 }
252
253 static const struct super_operations ceph_super_ops = {
254         .alloc_inode    = ceph_alloc_inode,
255         .destroy_inode  = ceph_destroy_inode,
256         .write_inode    = ceph_write_inode,
257         .sync_fs        = ceph_syncfs,
258         .put_super      = ceph_put_super,
259         .show_options   = ceph_show_options,
260         .statfs         = ceph_statfs,
261         .umount_begin   = ceph_umount_begin,
262 };
263
264
265 const char *ceph_msg_type_name(int type)
266 {
267         switch (type) {
268         case CEPH_MSG_SHUTDOWN: return "shutdown";
269         case CEPH_MSG_PING: return "ping";
270         case CEPH_MSG_AUTH: return "auth";
271         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
272         case CEPH_MSG_MON_MAP: return "mon_map";
273         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
274         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
275         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
276         case CEPH_MSG_STATFS: return "statfs";
277         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
278         case CEPH_MSG_MDS_MAP: return "mds_map";
279         case CEPH_MSG_CLIENT_SESSION: return "client_session";
280         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
281         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
282         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
283         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
284         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
285         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
286         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
287         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
288         case CEPH_MSG_OSD_MAP: return "osd_map";
289         case CEPH_MSG_OSD_OP: return "osd_op";
290         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
291         default: return "unknown";
292         }
293 }
294
295
296 /*
297  * mount options
298  */
299 enum {
300         Opt_fsidmajor,
301         Opt_fsidminor,
302         Opt_monport,
303         Opt_wsize,
304         Opt_rsize,
305         Opt_osdtimeout,
306         Opt_osdkeepalivetimeout,
307         Opt_mount_timeout,
308         Opt_osd_idle_ttl,
309         Opt_caps_wanted_delay_min,
310         Opt_caps_wanted_delay_max,
311         Opt_readdir_max_entries,
312         Opt_congestion_kb,
313         Opt_last_int,
314         /* int args above */
315         Opt_snapdirname,
316         Opt_name,
317         Opt_secret,
318         Opt_last_string,
319         /* string args above */
320         Opt_ip,
321         Opt_noshare,
322         Opt_dirstat,
323         Opt_nodirstat,
324         Opt_rbytes,
325         Opt_norbytes,
326         Opt_nocrc,
327         Opt_noasyncreaddir,
328 };
329
330 static match_table_t arg_tokens = {
331         {Opt_fsidmajor, "fsidmajor=%ld"},
332         {Opt_fsidminor, "fsidminor=%ld"},
333         {Opt_monport, "monport=%d"},
334         {Opt_wsize, "wsize=%d"},
335         {Opt_rsize, "rsize=%d"},
336         {Opt_osdtimeout, "osdtimeout=%d"},
337         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
338         {Opt_mount_timeout, "mount_timeout=%d"},
339         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
340         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
341         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
342         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
343         {Opt_congestion_kb, "write_congestion_kb=%d"},
344         /* int args above */
345         {Opt_snapdirname, "snapdirname=%s"},
346         {Opt_name, "name=%s"},
347         {Opt_secret, "secret=%s"},
348         /* string args above */
349         {Opt_ip, "ip=%s"},
350         {Opt_noshare, "noshare"},
351         {Opt_dirstat, "dirstat"},
352         {Opt_nodirstat, "nodirstat"},
353         {Opt_rbytes, "rbytes"},
354         {Opt_norbytes, "norbytes"},
355         {Opt_nocrc, "nocrc"},
356         {Opt_noasyncreaddir, "noasyncreaddir"},
357         {-1, NULL}
358 };
359
360
361 static struct ceph_mount_args *parse_mount_args(int flags, char *options,
362                                                 const char *dev_name,
363                                                 const char **path)
364 {
365         struct ceph_mount_args *args;
366         const char *c;
367         int err = -ENOMEM;
368         substring_t argstr[MAX_OPT_ARGS];
369
370         args = kzalloc(sizeof(*args), GFP_KERNEL);
371         if (!args)
372                 return ERR_PTR(-ENOMEM);
373         args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
374                                  GFP_KERNEL);
375         if (!args->mon_addr)
376                 goto out;
377
378         dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
379
380         /* start with defaults */
381         args->sb_flags = flags;
382         args->flags = CEPH_OPT_DEFAULT;
383         args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
384         args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
385         args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
386         args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;   /* seconds */
387         args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
388         args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
389         args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
390         args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
391         args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
392         args->max_readdir = 1024;
393         args->congestion_kb = default_congestion_kb();
394
395         /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
396         err = -EINVAL;
397         if (!dev_name)
398                 goto out;
399         *path = strstr(dev_name, ":/");
400         if (*path == NULL) {
401                 pr_err("device name is missing path (no :/ in %s)\n",
402                        dev_name);
403                 goto out;
404         }
405
406         /* get mon ip(s) */
407         err = ceph_parse_ips(dev_name, *path, args->mon_addr,
408                              CEPH_MAX_MON, &args->num_mon);
409         if (err < 0)
410                 goto out;
411
412         /* path on server */
413         *path += 2;
414         dout("server path '%s'\n", *path);
415
416         /* parse mount options */
417         while ((c = strsep(&options, ",")) != NULL) {
418                 int token, intval, ret;
419                 if (!*c)
420                         continue;
421                 err = -EINVAL;
422                 token = match_token((char *)c, arg_tokens, argstr);
423                 if (token < 0) {
424                         pr_err("bad mount option at '%s'\n", c);
425                         goto out;
426                 }
427                 if (token < Opt_last_int) {
428                         ret = match_int(&argstr[0], &intval);
429                         if (ret < 0) {
430                                 pr_err("bad mount option arg (not int) "
431                                        "at '%s'\n", c);
432                                 continue;
433                         }
434                         dout("got int token %d val %d\n", token, intval);
435                 } else if (token > Opt_last_int && token < Opt_last_string) {
436                         dout("got string token %d val %s\n", token,
437                              argstr[0].from);
438                 } else {
439                         dout("got token %d\n", token);
440                 }
441                 switch (token) {
442                 case Opt_fsidmajor:
443                         *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
444                         break;
445                 case Opt_fsidminor:
446                         *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
447                         break;
448                 case Opt_ip:
449                         err = ceph_parse_ips(argstr[0].from,
450                                              argstr[0].to,
451                                              &args->my_addr,
452                                              1, NULL);
453                         if (err < 0)
454                                 goto out;
455                         args->flags |= CEPH_OPT_MYIP;
456                         break;
457
458                 case Opt_snapdirname:
459                         kfree(args->snapdir_name);
460                         args->snapdir_name = kstrndup(argstr[0].from,
461                                               argstr[0].to-argstr[0].from,
462                                               GFP_KERNEL);
463                         break;
464                 case Opt_name:
465                         args->name = kstrndup(argstr[0].from,
466                                               argstr[0].to-argstr[0].from,
467                                               GFP_KERNEL);
468                         break;
469                 case Opt_secret:
470                         args->secret = kstrndup(argstr[0].from,
471                                                 argstr[0].to-argstr[0].from,
472                                                 GFP_KERNEL);
473                         break;
474
475                         /* misc */
476                 case Opt_wsize:
477                         args->wsize = intval;
478                         break;
479                 case Opt_rsize:
480                         args->rsize = intval;
481                         break;
482                 case Opt_osdtimeout:
483                         args->osd_timeout = intval;
484                         break;
485                 case Opt_osdkeepalivetimeout:
486                         args->osd_keepalive_timeout = intval;
487                         break;
488                 case Opt_mount_timeout:
489                         args->mount_timeout = intval;
490                         break;
491                 case Opt_caps_wanted_delay_min:
492                         args->caps_wanted_delay_min = intval;
493                         break;
494                 case Opt_caps_wanted_delay_max:
495                         args->caps_wanted_delay_max = intval;
496                         break;
497                 case Opt_readdir_max_entries:
498                         args->max_readdir = intval;
499                         break;
500                 case Opt_congestion_kb:
501                         args->congestion_kb = intval;
502                         break;
503
504                 case Opt_noshare:
505                         args->flags |= CEPH_OPT_NOSHARE;
506                         break;
507
508                 case Opt_dirstat:
509                         args->flags |= CEPH_OPT_DIRSTAT;
510                         break;
511                 case Opt_nodirstat:
512                         args->flags &= ~CEPH_OPT_DIRSTAT;
513                         break;
514                 case Opt_rbytes:
515                         args->flags |= CEPH_OPT_RBYTES;
516                         break;
517                 case Opt_norbytes:
518                         args->flags &= ~CEPH_OPT_RBYTES;
519                         break;
520                 case Opt_nocrc:
521                         args->flags |= CEPH_OPT_NOCRC;
522                         break;
523                 case Opt_noasyncreaddir:
524                         args->flags |= CEPH_OPT_NOASYNCREADDIR;
525                         break;
526
527                 default:
528                         BUG_ON(token);
529                 }
530         }
531         return args;
532
533 out:
534         kfree(args->mon_addr);
535         kfree(args);
536         return ERR_PTR(err);
537 }
538
539 static void destroy_mount_args(struct ceph_mount_args *args)
540 {
541         dout("destroy_mount_args %p\n", args);
542         kfree(args->snapdir_name);
543         args->snapdir_name = NULL;
544         kfree(args->name);
545         args->name = NULL;
546         kfree(args->secret);
547         args->secret = NULL;
548         kfree(args);
549 }
550
551 /*
552  * create a fresh client instance
553  */
554 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
555 {
556         struct ceph_client *client;
557         int err = -ENOMEM;
558
559         client = kzalloc(sizeof(*client), GFP_KERNEL);
560         if (client == NULL)
561                 return ERR_PTR(-ENOMEM);
562
563         mutex_init(&client->mount_mutex);
564
565         init_waitqueue_head(&client->auth_wq);
566
567         client->sb = NULL;
568         client->mount_state = CEPH_MOUNT_MOUNTING;
569         client->mount_args = args;
570
571         client->msgr = NULL;
572
573         client->auth_err = 0;
574         atomic_long_set(&client->writeback_count, 0);
575
576         err = bdi_init(&client->backing_dev_info);
577         if (err < 0)
578                 goto fail;
579
580         err = -ENOMEM;
581         client->wb_wq = create_workqueue("ceph-writeback");
582         if (client->wb_wq == NULL)
583                 goto fail_bdi;
584         client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
585         if (client->pg_inv_wq == NULL)
586                 goto fail_wb_wq;
587         client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
588         if (client->trunc_wq == NULL)
589                 goto fail_pg_inv_wq;
590
591         /* set up mempools */
592         err = -ENOMEM;
593         client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
594                               client->mount_args->wsize >> PAGE_CACHE_SHIFT);
595         if (!client->wb_pagevec_pool)
596                 goto fail_trunc_wq;
597
598         /* caps */
599         client->min_caps = args->max_readdir;
600         ceph_adjust_min_caps(client->min_caps);
601
602         /* subsystems */
603         err = ceph_monc_init(&client->monc, client);
604         if (err < 0)
605                 goto fail_mempool;
606         err = ceph_osdc_init(&client->osdc, client);
607         if (err < 0)
608                 goto fail_monc;
609         err = ceph_mdsc_init(&client->mdsc, client);
610         if (err < 0)
611                 goto fail_osdc;
612         return client;
613
614 fail_osdc:
615         ceph_osdc_stop(&client->osdc);
616 fail_monc:
617         ceph_monc_stop(&client->monc);
618 fail_mempool:
619         mempool_destroy(client->wb_pagevec_pool);
620 fail_trunc_wq:
621         destroy_workqueue(client->trunc_wq);
622 fail_pg_inv_wq:
623         destroy_workqueue(client->pg_inv_wq);
624 fail_wb_wq:
625         destroy_workqueue(client->wb_wq);
626 fail_bdi:
627         bdi_destroy(&client->backing_dev_info);
628 fail:
629         kfree(client);
630         return ERR_PTR(err);
631 }
632
633 static void ceph_destroy_client(struct ceph_client *client)
634 {
635         dout("destroy_client %p\n", client);
636
637         /* unmount */
638         ceph_mdsc_stop(&client->mdsc);
639         ceph_monc_stop(&client->monc);
640         ceph_osdc_stop(&client->osdc);
641
642         ceph_adjust_min_caps(-client->min_caps);
643
644         ceph_debugfs_client_cleanup(client);
645         destroy_workqueue(client->wb_wq);
646         destroy_workqueue(client->pg_inv_wq);
647         destroy_workqueue(client->trunc_wq);
648
649         bdi_destroy(&client->backing_dev_info);
650
651         if (client->msgr)
652                 ceph_messenger_destroy(client->msgr);
653         mempool_destroy(client->wb_pagevec_pool);
654
655         destroy_mount_args(client->mount_args);
656
657         kfree(client);
658         dout("destroy_client %p done\n", client);
659 }
660
661 /*
662  * Initially learn our fsid, or verify an fsid matches.
663  */
664 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
665 {
666         if (client->have_fsid) {
667                 if (ceph_fsid_compare(&client->fsid, fsid)) {
668                         pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
669                                PR_FSID(&client->fsid), PR_FSID(fsid));
670                         return -1;
671                 }
672         } else {
673                 pr_info("client%lld fsid " FSID_FORMAT "\n",
674                         client->monc.auth->global_id, PR_FSID(fsid));
675                 memcpy(&client->fsid, fsid, sizeof(*fsid));
676                 ceph_debugfs_client_init(client);
677                 client->have_fsid = true;
678         }
679         return 0;
680 }
681
682 /*
683  * true if we have the mon map (and have thus joined the cluster)
684  */
685 static int have_mon_map(struct ceph_client *client)
686 {
687         return client->monc.monmap && client->monc.monmap->epoch;
688 }
689
690 /*
691  * Bootstrap mount by opening the root directory.  Note the mount
692  * @started time from caller, and time out if this takes too long.
693  */
694 static struct dentry *open_root_dentry(struct ceph_client *client,
695                                        const char *path,
696                                        unsigned long started)
697 {
698         struct ceph_mds_client *mdsc = &client->mdsc;
699         struct ceph_mds_request *req = NULL;
700         int err;
701         struct dentry *root;
702
703         /* open dir */
704         dout("open_root_inode opening '%s'\n", path);
705         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
706         if (IS_ERR(req))
707                 return ERR_PTR(PTR_ERR(req));
708         req->r_path1 = kstrdup(path, GFP_NOFS);
709         req->r_ino1.ino = CEPH_INO_ROOT;
710         req->r_ino1.snap = CEPH_NOSNAP;
711         req->r_started = started;
712         req->r_timeout = client->mount_args->mount_timeout * HZ;
713         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
714         req->r_num_caps = 2;
715         err = ceph_mdsc_do_request(mdsc, NULL, req);
716         if (err == 0) {
717                 dout("open_root_inode success\n");
718                 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
719                     client->sb->s_root == NULL)
720                         root = d_alloc_root(req->r_target_inode);
721                 else
722                         root = d_obtain_alias(req->r_target_inode);
723                 req->r_target_inode = NULL;
724                 dout("open_root_inode success, root dentry is %p\n", root);
725         } else {
726                 root = ERR_PTR(err);
727         }
728         ceph_mdsc_put_request(req);
729         return root;
730 }
731
732 /*
733  * mount: join the ceph cluster, and open root directory.
734  */
735 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
736                       const char *path)
737 {
738         struct ceph_entity_addr *myaddr = NULL;
739         int err;
740         unsigned long timeout = client->mount_args->mount_timeout * HZ;
741         unsigned long started = jiffies;  /* note the start time */
742         struct dentry *root;
743
744         dout("mount start\n");
745         mutex_lock(&client->mount_mutex);
746
747         /* initialize the messenger */
748         if (client->msgr == NULL) {
749                 if (ceph_test_opt(client, MYIP))
750                         myaddr = &client->mount_args->my_addr;
751                 client->msgr = ceph_messenger_create(myaddr);
752                 if (IS_ERR(client->msgr)) {
753                         err = PTR_ERR(client->msgr);
754                         client->msgr = NULL;
755                         goto out;
756                 }
757                 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
758         }
759
760         /* open session, and wait for mon, mds, and osd maps */
761         err = ceph_monc_open_session(&client->monc);
762         if (err < 0)
763                 goto out;
764
765         while (!have_mon_map(client)) {
766                 err = -EIO;
767                 if (timeout && time_after_eq(jiffies, started + timeout))
768                         goto out;
769
770                 /* wait */
771                 dout("mount waiting for mon_map\n");
772                 err = wait_event_interruptible_timeout(client->auth_wq,
773                                have_mon_map(client) || (client->auth_err < 0),
774                                timeout);
775                 if (err == -EINTR || err == -ERESTARTSYS)
776                         goto out;
777                 if (client->auth_err < 0) {
778                         err = client->auth_err;
779                         goto out;
780                 }
781         }
782
783         dout("mount opening root\n");
784         root = open_root_dentry(client, "", started);
785         if (IS_ERR(root)) {
786                 err = PTR_ERR(root);
787                 goto out;
788         }
789         if (client->sb->s_root)
790                 dput(root);
791         else
792                 client->sb->s_root = root;
793
794         if (path[0] == 0) {
795                 dget(root);
796         } else {
797                 dout("mount opening base mountpoint\n");
798                 root = open_root_dentry(client, path, started);
799                 if (IS_ERR(root)) {
800                         err = PTR_ERR(root);
801                         dput(client->sb->s_root);
802                         client->sb->s_root = NULL;
803                         goto out;
804                 }
805         }
806
807         mnt->mnt_root = root;
808         mnt->mnt_sb = client->sb;
809
810         client->mount_state = CEPH_MOUNT_MOUNTED;
811         dout("mount success\n");
812         err = 0;
813
814 out:
815         mutex_unlock(&client->mount_mutex);
816         return err;
817 }
818
819 static int ceph_set_super(struct super_block *s, void *data)
820 {
821         struct ceph_client *client = data;
822         int ret;
823
824         dout("set_super %p data %p\n", s, data);
825
826         s->s_flags = client->mount_args->sb_flags;
827         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
828
829         s->s_fs_info = client;
830         client->sb = s;
831
832         s->s_op = &ceph_super_ops;
833         s->s_export_op = &ceph_export_ops;
834
835         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
836
837         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
838         if (ret != 0)
839                 goto fail;
840
841         return ret;
842
843 fail:
844         s->s_fs_info = NULL;
845         client->sb = NULL;
846         return ret;
847 }
848
849 /*
850  * share superblock if same fs AND options
851  */
852 static int ceph_compare_super(struct super_block *sb, void *data)
853 {
854         struct ceph_client *new = data;
855         struct ceph_mount_args *args = new->mount_args;
856         struct ceph_client *other = ceph_sb_to_client(sb);
857         int i;
858
859         dout("ceph_compare_super %p\n", sb);
860         if (args->flags & CEPH_OPT_FSID) {
861                 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
862                         dout("fsid doesn't match\n");
863                         return 0;
864                 }
865         } else {
866                 /* do we share (a) monitor? */
867                 for (i = 0; i < new->monc.monmap->num_mon; i++)
868                         if (ceph_monmap_contains(other->monc.monmap,
869                                          &new->monc.monmap->mon_inst[i].addr))
870                                 break;
871                 if (i == new->monc.monmap->num_mon) {
872                         dout("mon ip not part of monmap\n");
873                         return 0;
874                 }
875                 dout("mon ip matches existing sb %p\n", sb);
876         }
877         if (args->sb_flags != other->mount_args->sb_flags) {
878                 dout("flags differ\n");
879                 return 0;
880         }
881         return 1;
882 }
883
884 /*
885  * construct our own bdi so we can control readahead, etc.
886  */
887 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
888 {
889         int err;
890
891         /* set ra_pages based on rsize mount option? */
892         if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
893                 client->backing_dev_info.ra_pages =
894                         (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
895                         >> PAGE_SHIFT;
896         err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
897         if (!err)
898                 sb->s_bdi = &client->backing_dev_info;
899         return err;
900 }
901
902 static int ceph_get_sb(struct file_system_type *fs_type,
903                        int flags, const char *dev_name, void *data,
904                        struct vfsmount *mnt)
905 {
906         struct super_block *sb;
907         struct ceph_client *client;
908         int err;
909         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
910         const char *path = NULL;
911         struct ceph_mount_args *args;
912
913         dout("ceph_get_sb\n");
914         args = parse_mount_args(flags, data, dev_name, &path);
915         if (IS_ERR(args)) {
916                 err = PTR_ERR(args);
917                 goto out_final;
918         }
919
920         /* create client (which we may/may not use) */
921         client = ceph_create_client(args);
922         if (IS_ERR(client)) {
923                 err = PTR_ERR(client);
924                 goto out_final;
925         }
926
927         if (client->mount_args->flags & CEPH_OPT_NOSHARE)
928                 compare_super = NULL;
929         sb = sget(fs_type, compare_super, ceph_set_super, client);
930         if (IS_ERR(sb)) {
931                 err = PTR_ERR(sb);
932                 goto out;
933         }
934
935         if (ceph_client(sb) != client) {
936                 ceph_destroy_client(client);
937                 client = ceph_client(sb);
938                 dout("get_sb got existing client %p\n", client);
939         } else {
940                 dout("get_sb using new client %p\n", client);
941                 err = ceph_register_bdi(sb, client);
942                 if (err < 0)
943                         goto out_splat;
944         }
945
946         err = ceph_mount(client, mnt, path);
947         if (err < 0)
948                 goto out_splat;
949         dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
950              mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
951         return 0;
952
953 out_splat:
954         ceph_mdsc_close_sessions(&client->mdsc);
955         deactivate_locked_super(sb);
956         goto out_final;
957
958 out:
959         ceph_destroy_client(client);
960 out_final:
961         dout("ceph_get_sb fail %d\n", err);
962         return err;
963 }
964
965 static void ceph_kill_sb(struct super_block *s)
966 {
967         struct ceph_client *client = ceph_sb_to_client(s);
968         dout("kill_sb %p\n", s);
969         ceph_mdsc_pre_umount(&client->mdsc);
970         kill_anon_super(s);    /* will call put_super after sb is r/o */
971         ceph_destroy_client(client);
972 }
973
974 static struct file_system_type ceph_fs_type = {
975         .owner          = THIS_MODULE,
976         .name           = "ceph",
977         .get_sb         = ceph_get_sb,
978         .kill_sb        = ceph_kill_sb,
979         .fs_flags       = FS_RENAME_DOES_D_MOVE,
980 };
981
982 #define _STRINGIFY(x) #x
983 #define STRINGIFY(x) _STRINGIFY(x)
984
985 static int __init init_ceph(void)
986 {
987         int ret = 0;
988
989         ret = ceph_debugfs_init();
990         if (ret < 0)
991                 goto out;
992
993         ret = ceph_msgr_init();
994         if (ret < 0)
995                 goto out_debugfs;
996
997         ret = init_caches();
998         if (ret)
999                 goto out_msgr;
1000
1001         ceph_caps_init();
1002
1003         ret = register_filesystem(&ceph_fs_type);
1004         if (ret)
1005                 goto out_icache;
1006
1007         pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n",
1008                 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL,
1009                 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
1010                 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
1011         return 0;
1012
1013 out_icache:
1014         destroy_caches();
1015 out_msgr:
1016         ceph_msgr_exit();
1017 out_debugfs:
1018         ceph_debugfs_cleanup();
1019 out:
1020         return ret;
1021 }
1022
1023 static void __exit exit_ceph(void)
1024 {
1025         dout("exit_ceph\n");
1026         unregister_filesystem(&ceph_fs_type);
1027         ceph_caps_finalize();
1028         destroy_caches();
1029         ceph_msgr_exit();
1030         ceph_debugfs_cleanup();
1031 }
1032
1033 module_init(init_ceph);
1034 module_exit(exit_ceph);
1035
1036 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1037 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1038 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1039 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1040 MODULE_LICENSE("GPL");