ceph: decode updated mdsmap format
[deliverable/linux.git] / fs / ceph / super.c
CommitLineData
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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/statfs.h>
15#include <linux/string.h>
16#include <linux/version.h>
17#include <linux/vmalloc.h>
18
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19#include "decode.h"
20#include "super.h"
21#include "mon_client.h"
0743304d 22#include "auth.h"
16725b9d
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23
24/*
25 * Ceph superblock operations
26 *
27 * Handle the basics of mounting, unmounting.
28 */
29
30
31/*
32 * find filename portion of a path (/foo/bar/baz -> baz)
33 */
34const char *ceph_file_part(const char *s, int len)
35{
36 const char *e = s + len;
37
38 while (e != s && *(e-1) != '/')
39 e--;
40 return e;
41}
42
43
44/*
45 * super ops
46 */
47static void ceph_put_super(struct super_block *s)
48{
49 struct ceph_client *cl = ceph_client(s);
50
51 dout("put_super\n");
52 ceph_mdsc_close_sessions(&cl->mdsc);
53 return;
54}
55
56static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
57{
58 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
59 struct ceph_monmap *monmap = 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(&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 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
77 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
78 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
79 (CEPH_BLOCK_SHIFT-10);
80 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
81
82 buf->f_files = le64_to_cpu(st.num_objects);
83 buf->f_ffree = -1;
84 buf->f_namelen = PATH_MAX;
85 buf->f_frsize = PAGE_CACHE_SIZE;
86
87 /* leave fsid little-endian, regardless of host endianness */
88 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
89 buf->f_fsid.val[0] = fsid & 0xffffffff;
90 buf->f_fsid.val[1] = fsid >> 32;
91
92 return 0;
93}
94
95
96static int ceph_syncfs(struct super_block *sb, int wait)
97{
98 dout("sync_fs %d\n", wait);
99 ceph_osdc_sync(&ceph_client(sb)->osdc);
100 ceph_mdsc_sync(&ceph_client(sb)->mdsc);
f2cf418c 101 dout("sync_fs %d done\n", wait);
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102 return 0;
103}
104
105
106/**
107 * ceph_show_options - Show mount options in /proc/mounts
108 * @m: seq_file to write to
109 * @mnt: mount descriptor
110 */
111static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
112{
113 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
6b805185 114 struct ceph_mount_args *args = client->mount_args;
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115
116 if (args->flags & CEPH_OPT_FSID)
117 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
118 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
119 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
120 if (args->flags & CEPH_OPT_NOSHARE)
121 seq_puts(m, ",noshare");
122 if (args->flags & CEPH_OPT_DIRSTAT)
123 seq_puts(m, ",dirstat");
124 if ((args->flags & CEPH_OPT_RBYTES) == 0)
125 seq_puts(m, ",norbytes");
126 if (args->flags & CEPH_OPT_NOCRC)
127 seq_puts(m, ",nocrc");
128 if (args->flags & CEPH_OPT_NOASYNCREADDIR)
129 seq_puts(m, ",noasyncreaddir");
130 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
131 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
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SW
132 if (args->name)
133 seq_printf(m, ",name=%s", args->name);
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134 if (args->secret)
135 seq_puts(m, ",secret=<hidden>");
136 return 0;
137}
138
139/*
140 * caches
141 */
142struct kmem_cache *ceph_inode_cachep;
143struct kmem_cache *ceph_cap_cachep;
144struct kmem_cache *ceph_dentry_cachep;
145struct kmem_cache *ceph_file_cachep;
146
147static void ceph_inode_init_once(void *foo)
148{
149 struct ceph_inode_info *ci = foo;
150 inode_init_once(&ci->vfs_inode);
151}
152
153static int __init init_caches(void)
154{
155 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
156 sizeof(struct ceph_inode_info),
157 __alignof__(struct ceph_inode_info),
158 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
159 ceph_inode_init_once);
160 if (ceph_inode_cachep == NULL)
161 return -ENOMEM;
162
163 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
164 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
165 if (ceph_cap_cachep == NULL)
166 goto bad_cap;
167
168 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
169 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
170 if (ceph_dentry_cachep == NULL)
171 goto bad_dentry;
172
173 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
174 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
175 if (ceph_file_cachep == NULL)
176 goto bad_file;
177
178 return 0;
179
180bad_file:
181 kmem_cache_destroy(ceph_dentry_cachep);
182bad_dentry:
183 kmem_cache_destroy(ceph_cap_cachep);
184bad_cap:
185 kmem_cache_destroy(ceph_inode_cachep);
186 return -ENOMEM;
187}
188
189static void destroy_caches(void)
190{
191 kmem_cache_destroy(ceph_inode_cachep);
192 kmem_cache_destroy(ceph_cap_cachep);
193 kmem_cache_destroy(ceph_dentry_cachep);
194 kmem_cache_destroy(ceph_file_cachep);
195}
196
197
198/*
199 * ceph_umount_begin - initiate forced umount. Tear down down the
200 * mount, skipping steps that may hang while waiting for server(s).
201 */
202static void ceph_umount_begin(struct super_block *sb)
203{
204 struct ceph_client *client = ceph_sb_to_client(sb);
205
206 dout("ceph_umount_begin - starting forced umount\n");
207 if (!client)
208 return;
209 client->mount_state = CEPH_MOUNT_SHUTDOWN;
210 return;
211}
212
213static const struct super_operations ceph_super_ops = {
214 .alloc_inode = ceph_alloc_inode,
215 .destroy_inode = ceph_destroy_inode,
216 .write_inode = ceph_write_inode,
217 .sync_fs = ceph_syncfs,
218 .put_super = ceph_put_super,
219 .show_options = ceph_show_options,
220 .statfs = ceph_statfs,
221 .umount_begin = ceph_umount_begin,
222};
223
224
225const char *ceph_msg_type_name(int type)
226{
227 switch (type) {
228 case CEPH_MSG_SHUTDOWN: return "shutdown";
229 case CEPH_MSG_PING: return "ping";
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230 case CEPH_MSG_AUTH: return "auth";
231 case CEPH_MSG_AUTH_REPLY: return "auth_reply";
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232 case CEPH_MSG_MON_MAP: return "mon_map";
233 case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
234 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
235 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
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236 case CEPH_MSG_STATFS: return "statfs";
237 case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
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238 case CEPH_MSG_MDS_MAP: return "mds_map";
239 case CEPH_MSG_CLIENT_SESSION: return "client_session";
240 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
241 case CEPH_MSG_CLIENT_REQUEST: return "client_request";
242 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
243 case CEPH_MSG_CLIENT_REPLY: return "client_reply";
244 case CEPH_MSG_CLIENT_CAPS: return "client_caps";
245 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
246 case CEPH_MSG_CLIENT_SNAP: return "client_snap";
247 case CEPH_MSG_CLIENT_LEASE: return "client_lease";
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248 case CEPH_MSG_OSD_MAP: return "osd_map";
249 case CEPH_MSG_OSD_OP: return "osd_op";
250 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
251 default: return "unknown";
252 }
253}
254
255
256/*
257 * mount options
258 */
259enum {
260 Opt_fsidmajor,
261 Opt_fsidminor,
262 Opt_monport,
263 Opt_wsize,
264 Opt_rsize,
265 Opt_osdtimeout,
266 Opt_mount_timeout,
267 Opt_caps_wanted_delay_min,
268 Opt_caps_wanted_delay_max,
269 Opt_readdir_max_entries,
e53c2fe0 270 Opt_last_int,
16725b9d
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271 /* int args above */
272 Opt_snapdirname,
4e7a5dcd 273 Opt_name,
16725b9d 274 Opt_secret,
e53c2fe0 275 Opt_last_string,
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276 /* string args above */
277 Opt_ip,
278 Opt_noshare,
279 Opt_dirstat,
280 Opt_nodirstat,
281 Opt_rbytes,
282 Opt_norbytes,
283 Opt_nocrc,
284 Opt_noasyncreaddir,
285};
286
287static match_table_t arg_tokens = {
288 {Opt_fsidmajor, "fsidmajor=%ld"},
289 {Opt_fsidminor, "fsidminor=%ld"},
290 {Opt_monport, "monport=%d"},
291 {Opt_wsize, "wsize=%d"},
292 {Opt_rsize, "rsize=%d"},
293 {Opt_osdtimeout, "osdtimeout=%d"},
294 {Opt_mount_timeout, "mount_timeout=%d"},
295 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
296 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
297 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
298 /* int args above */
299 {Opt_snapdirname, "snapdirname=%s"},
4e7a5dcd 300 {Opt_name, "name=%s"},
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301 {Opt_secret, "secret=%s"},
302 /* string args above */
303 {Opt_ip, "ip=%s"},
304 {Opt_noshare, "noshare"},
305 {Opt_dirstat, "dirstat"},
306 {Opt_nodirstat, "nodirstat"},
307 {Opt_rbytes, "rbytes"},
308 {Opt_norbytes, "norbytes"},
309 {Opt_nocrc, "nocrc"},
310 {Opt_noasyncreaddir, "noasyncreaddir"},
311 {-1, NULL}
312};
313
314
6b805185
SW
315static struct ceph_mount_args *parse_mount_args(int flags, char *options,
316 const char *dev_name,
317 const char **path)
16725b9d 318{
6b805185 319 struct ceph_mount_args *args;
16725b9d 320 const char *c;
6b805185 321 int err = -ENOMEM;
16725b9d 322 substring_t argstr[MAX_OPT_ARGS];
16725b9d 323
6b805185
SW
324 args = kzalloc(sizeof(*args), GFP_KERNEL);
325 if (!args)
326 return ERR_PTR(-ENOMEM);
327 args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
328 GFP_KERNEL);
329 if (!args->mon_addr)
330 goto out;
16725b9d 331
6b805185 332 dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
7b813c46 333
16725b9d
SW
334 /* start with defaults */
335 args->sb_flags = flags;
336 args->flags = CEPH_OPT_DEFAULT;
337 args->osd_timeout = 5; /* seconds */
338 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
339 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
340 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
8fa97655 341 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
16725b9d
SW
342 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
343 args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
344 args->max_readdir = 1024;
345
346 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
7b813c46 347 err = -EINVAL;
16725b9d 348 if (!dev_name)
7b813c46 349 goto out;
16725b9d
SW
350 *path = strstr(dev_name, ":/");
351 if (*path == NULL) {
352 pr_err("device name is missing path (no :/ in %s)\n",
353 dev_name);
7b813c46 354 goto out;
16725b9d
SW
355 }
356
357 /* get mon ip(s) */
6b805185
SW
358 err = ceph_parse_ips(dev_name, *path, args->mon_addr,
359 CEPH_MAX_MON, &args->num_mon);
16725b9d 360 if (err < 0)
7b813c46 361 goto out;
16725b9d 362
16725b9d
SW
363 /* path on server */
364 *path += 2;
365 dout("server path '%s'\n", *path);
366
367 /* parse mount options */
368 while ((c = strsep(&options, ",")) != NULL) {
369 int token, intval, ret;
370 if (!*c)
371 continue;
7b813c46 372 err = -EINVAL;
16725b9d
SW
373 token = match_token((char *)c, arg_tokens, argstr);
374 if (token < 0) {
375 pr_err("bad mount option at '%s'\n", c);
7b813c46 376 goto out;
16725b9d 377 }
e53c2fe0 378 if (token < Opt_last_int) {
16725b9d
SW
379 ret = match_int(&argstr[0], &intval);
380 if (ret < 0) {
381 pr_err("bad mount option arg (not int) "
382 "at '%s'\n", c);
383 continue;
384 }
e53c2fe0
SW
385 dout("got int token %d val %d\n", token, intval);
386 } else if (token > Opt_last_int && token < Opt_last_string) {
387 dout("got string token %d val %s\n", token,
388 argstr[0].from);
389 } else {
390 dout("got token %d\n", token);
16725b9d
SW
391 }
392 switch (token) {
393 case Opt_fsidmajor:
394 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
395 break;
396 case Opt_fsidminor:
397 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
398 break;
399 case Opt_ip:
400 err = ceph_parse_ips(argstr[0].from,
401 argstr[0].to,
402 &args->my_addr,
403 1, NULL);
404 if (err < 0)
6b805185 405 goto out;
16725b9d
SW
406 args->flags |= CEPH_OPT_MYIP;
407 break;
408
409 case Opt_snapdirname:
410 kfree(args->snapdir_name);
411 args->snapdir_name = kstrndup(argstr[0].from,
412 argstr[0].to-argstr[0].from,
413 GFP_KERNEL);
414 break;
4e7a5dcd
SW
415 case Opt_name:
416 args->name = kstrndup(argstr[0].from,
417 argstr[0].to-argstr[0].from,
418 GFP_KERNEL);
419 break;
16725b9d
SW
420 case Opt_secret:
421 args->secret = kstrndup(argstr[0].from,
422 argstr[0].to-argstr[0].from,
423 GFP_KERNEL);
424 break;
425
426 /* misc */
427 case Opt_wsize:
428 args->wsize = intval;
429 break;
430 case Opt_rsize:
431 args->rsize = intval;
432 break;
433 case Opt_osdtimeout:
434 args->osd_timeout = intval;
435 break;
436 case Opt_mount_timeout:
437 args->mount_timeout = intval;
438 break;
439 case Opt_caps_wanted_delay_min:
440 args->caps_wanted_delay_min = intval;
441 break;
442 case Opt_caps_wanted_delay_max:
443 args->caps_wanted_delay_max = intval;
444 break;
445 case Opt_readdir_max_entries:
446 args->max_readdir = intval;
447 break;
448
449 case Opt_noshare:
450 args->flags |= CEPH_OPT_NOSHARE;
451 break;
452
453 case Opt_dirstat:
454 args->flags |= CEPH_OPT_DIRSTAT;
455 break;
456 case Opt_nodirstat:
457 args->flags &= ~CEPH_OPT_DIRSTAT;
458 break;
459 case Opt_rbytes:
460 args->flags |= CEPH_OPT_RBYTES;
461 break;
462 case Opt_norbytes:
463 args->flags &= ~CEPH_OPT_RBYTES;
464 break;
465 case Opt_nocrc:
466 args->flags |= CEPH_OPT_NOCRC;
467 break;
468 case Opt_noasyncreaddir:
469 args->flags |= CEPH_OPT_NOASYNCREADDIR;
470 break;
471
472 default:
473 BUG_ON(token);
474 }
475 }
6b805185 476 return args;
16725b9d 477
7b813c46 478out:
6b805185
SW
479 kfree(args->mon_addr);
480 kfree(args);
481 return ERR_PTR(err);
16725b9d
SW
482}
483
6b805185 484static void destroy_mount_args(struct ceph_mount_args *args)
16725b9d 485{
6b805185 486 dout("destroy_mount_args %p\n", args);
16725b9d
SW
487 kfree(args->snapdir_name);
488 args->snapdir_name = NULL;
4e7a5dcd
SW
489 kfree(args->name);
490 args->name = NULL;
16725b9d
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491 kfree(args->secret);
492 args->secret = NULL;
6b805185 493 kfree(args);
16725b9d
SW
494}
495
496/*
497 * create a fresh client instance
498 */
6b805185 499static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
16725b9d
SW
500{
501 struct ceph_client *client;
502 int err = -ENOMEM;
503
504 client = kzalloc(sizeof(*client), GFP_KERNEL);
505 if (client == NULL)
506 return ERR_PTR(-ENOMEM);
507
508 mutex_init(&client->mount_mutex);
509
510 init_waitqueue_head(&client->mount_wq);
511
512 client->sb = NULL;
513 client->mount_state = CEPH_MOUNT_MOUNTING;
6b805185 514 client->mount_args = args;
16725b9d
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515
516 client->msgr = NULL;
517
518 client->mount_err = 0;
16725b9d 519
859e7b14
SW
520 err = bdi_init(&client->backing_dev_info);
521 if (err < 0)
522 goto fail;
523
16725b9d
SW
524 err = -ENOMEM;
525 client->wb_wq = create_workqueue("ceph-writeback");
526 if (client->wb_wq == NULL)
859e7b14 527 goto fail_bdi;
16725b9d
SW
528 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
529 if (client->pg_inv_wq == NULL)
530 goto fail_wb_wq;
531 client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
532 if (client->trunc_wq == NULL)
533 goto fail_pg_inv_wq;
534
b9bfb93c
SW
535 /* set up mempools */
536 err = -ENOMEM;
537 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
538 client->mount_args->wsize >> PAGE_CACHE_SHIFT);
539 if (!client->wb_pagevec_pool)
540 goto fail_trunc_wq;
541
542
16725b9d
SW
543 /* subsystems */
544 err = ceph_monc_init(&client->monc, client);
545 if (err < 0)
b9bfb93c 546 goto fail_mempool;
16725b9d
SW
547 err = ceph_osdc_init(&client->osdc, client);
548 if (err < 0)
549 goto fail_monc;
5f44f142
SW
550 err = ceph_mdsc_init(&client->mdsc, client);
551 if (err < 0)
552 goto fail_osdc;
16725b9d
SW
553 return client;
554
5f44f142
SW
555fail_osdc:
556 ceph_osdc_stop(&client->osdc);
16725b9d
SW
557fail_monc:
558 ceph_monc_stop(&client->monc);
b9bfb93c
SW
559fail_mempool:
560 mempool_destroy(client->wb_pagevec_pool);
16725b9d
SW
561fail_trunc_wq:
562 destroy_workqueue(client->trunc_wq);
563fail_pg_inv_wq:
564 destroy_workqueue(client->pg_inv_wq);
565fail_wb_wq:
566 destroy_workqueue(client->wb_wq);
859e7b14
SW
567fail_bdi:
568 bdi_destroy(&client->backing_dev_info);
16725b9d
SW
569fail:
570 kfree(client);
571 return ERR_PTR(err);
572}
573
574static void ceph_destroy_client(struct ceph_client *client)
575{
576 dout("destroy_client %p\n", client);
577
578 /* unmount */
579 ceph_mdsc_stop(&client->mdsc);
580 ceph_monc_stop(&client->monc);
581 ceph_osdc_stop(&client->osdc);
582
16725b9d
SW
583 ceph_debugfs_client_cleanup(client);
584 destroy_workqueue(client->wb_wq);
585 destroy_workqueue(client->pg_inv_wq);
586 destroy_workqueue(client->trunc_wq);
587
588 if (client->msgr)
589 ceph_messenger_destroy(client->msgr);
b9bfb93c 590 mempool_destroy(client->wb_pagevec_pool);
16725b9d 591
6b805185 592 destroy_mount_args(client->mount_args);
16725b9d
SW
593
594 kfree(client);
595 dout("destroy_client %p done\n", client);
596}
597
0743304d
SW
598/*
599 * Initially learn our fsid, or verify an fsid matches.
600 */
601int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
602{
603 if (client->have_fsid) {
604 if (ceph_fsid_compare(&client->fsid, fsid)) {
605 print_hex_dump(KERN_ERR, "this fsid: ",
606 DUMP_PREFIX_NONE, 16, 1,
607 (void *)fsid, 16, 0);
608 print_hex_dump(KERN_ERR, " old fsid: ",
609 DUMP_PREFIX_NONE, 16, 1,
610 (void *)&client->fsid, 16, 0);
611 pr_err("fsid mismatch\n");
612 return -1;
613 }
614 } else {
615 pr_info("client%lld fsid " FSID_FORMAT "\n",
616 client->monc.auth->global_id, PR_FSID(fsid));
617 memcpy(&client->fsid, fsid, sizeof(*fsid));
618 ceph_debugfs_client_init(client);
619 client->have_fsid = true;
620 }
621 return 0;
622}
623
16725b9d
SW
624/*
625 * true if we have the mon map (and have thus joined the cluster)
626 */
627static int have_mon_map(struct ceph_client *client)
628{
629 return client->monc.monmap && client->monc.monmap->epoch;
630}
631
632/*
633 * Bootstrap mount by opening the root directory. Note the mount
634 * @started time from caller, and time out if this takes too long.
635 */
636static struct dentry *open_root_dentry(struct ceph_client *client,
637 const char *path,
638 unsigned long started)
639{
640 struct ceph_mds_client *mdsc = &client->mdsc;
641 struct ceph_mds_request *req = NULL;
642 int err;
643 struct dentry *root;
644
645 /* open dir */
646 dout("open_root_inode opening '%s'\n", path);
647 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
648 if (IS_ERR(req))
649 return ERR_PTR(PTR_ERR(req));
650 req->r_path1 = kstrdup(path, GFP_NOFS);
651 req->r_ino1.ino = CEPH_INO_ROOT;
652 req->r_ino1.snap = CEPH_NOSNAP;
653 req->r_started = started;
6b805185 654 req->r_timeout = client->mount_args->mount_timeout * HZ;
16725b9d
SW
655 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
656 req->r_num_caps = 2;
657 err = ceph_mdsc_do_request(mdsc, NULL, req);
658 if (err == 0) {
659 dout("open_root_inode success\n");
660 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
661 client->sb->s_root == NULL)
662 root = d_alloc_root(req->r_target_inode);
663 else
664 root = d_obtain_alias(req->r_target_inode);
665 req->r_target_inode = NULL;
666 dout("open_root_inode success, root dentry is %p\n", root);
667 } else {
668 root = ERR_PTR(err);
669 }
670 ceph_mdsc_put_request(req);
671 return root;
672}
673
674/*
675 * mount: join the ceph cluster, and open root directory.
676 */
677static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
678 const char *path)
679{
680 struct ceph_entity_addr *myaddr = NULL;
681 int err;
6b805185 682 unsigned long timeout = client->mount_args->mount_timeout * HZ;
16725b9d
SW
683 unsigned long started = jiffies; /* note the start time */
684 struct dentry *root;
685
686 dout("mount start\n");
687 mutex_lock(&client->mount_mutex);
688
689 /* initialize the messenger */
690 if (client->msgr == NULL) {
691 if (ceph_test_opt(client, MYIP))
6b805185 692 myaddr = &client->mount_args->my_addr;
16725b9d
SW
693 client->msgr = ceph_messenger_create(myaddr);
694 if (IS_ERR(client->msgr)) {
695 err = PTR_ERR(client->msgr);
696 client->msgr = NULL;
697 goto out;
698 }
699 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
700 }
701
4e7a5dcd
SW
702 /* open session, and wait for mon, mds, and osd maps */
703 err = ceph_monc_open_session(&client->monc);
16725b9d
SW
704 if (err < 0)
705 goto out;
706
4e7a5dcd 707 while (!have_mon_map(client)) {
16725b9d
SW
708 err = -EIO;
709 if (timeout && time_after_eq(jiffies, started + timeout))
710 goto out;
711
712 /* wait */
4e7a5dcd
SW
713 dout("mount waiting for mon_map\n");
714 err = wait_event_interruptible_timeout(client->mount_wq, /* FIXME */
715 have_mon_map(client),
16725b9d
SW
716 timeout);
717 if (err == -EINTR || err == -ERESTARTSYS)
718 goto out;
16725b9d
SW
719 }
720
721 dout("mount opening root\n");
722 root = open_root_dentry(client, "", started);
723 if (IS_ERR(root)) {
724 err = PTR_ERR(root);
725 goto out;
726 }
727 if (client->sb->s_root)
728 dput(root);
729 else
730 client->sb->s_root = root;
731
732 if (path[0] == 0) {
733 dget(root);
734 } else {
735 dout("mount opening base mountpoint\n");
736 root = open_root_dentry(client, path, started);
737 if (IS_ERR(root)) {
738 err = PTR_ERR(root);
739 dput(client->sb->s_root);
740 client->sb->s_root = NULL;
741 goto out;
742 }
743 }
744
745 mnt->mnt_root = root;
746 mnt->mnt_sb = client->sb;
747
748 client->mount_state = CEPH_MOUNT_MOUNTED;
749 dout("mount success\n");
750 err = 0;
751
752out:
753 mutex_unlock(&client->mount_mutex);
754 return err;
755}
756
757static int ceph_set_super(struct super_block *s, void *data)
758{
759 struct ceph_client *client = data;
760 int ret;
761
762 dout("set_super %p data %p\n", s, data);
763
6b805185 764 s->s_flags = client->mount_args->sb_flags;
16725b9d
SW
765 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
766
767 s->s_fs_info = client;
768 client->sb = s;
769
770 s->s_op = &ceph_super_ops;
771 s->s_export_op = &ceph_export_ops;
772
773 s->s_time_gran = 1000; /* 1000 ns == 1 us */
774
775 ret = set_anon_super(s, NULL); /* what is that second arg for? */
776 if (ret != 0)
777 goto fail;
778
779 return ret;
780
781fail:
782 s->s_fs_info = NULL;
783 client->sb = NULL;
784 return ret;
785}
786
787/*
788 * share superblock if same fs AND options
789 */
790static int ceph_compare_super(struct super_block *sb, void *data)
791{
792 struct ceph_client *new = data;
6b805185 793 struct ceph_mount_args *args = new->mount_args;
16725b9d
SW
794 struct ceph_client *other = ceph_sb_to_client(sb);
795 int i;
796
797 dout("ceph_compare_super %p\n", sb);
798 if (args->flags & CEPH_OPT_FSID) {
799 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
800 dout("fsid doesn't match\n");
801 return 0;
802 }
803 } else {
804 /* do we share (a) monitor? */
805 for (i = 0; i < new->monc.monmap->num_mon; i++)
806 if (ceph_monmap_contains(other->monc.monmap,
807 &new->monc.monmap->mon_inst[i].addr))
808 break;
809 if (i == new->monc.monmap->num_mon) {
810 dout("mon ip not part of monmap\n");
811 return 0;
812 }
813 dout("mon ip matches existing sb %p\n", sb);
814 }
6b805185 815 if (args->sb_flags != other->mount_args->sb_flags) {
16725b9d
SW
816 dout("flags differ\n");
817 return 0;
818 }
819 return 1;
820}
821
822/*
823 * construct our own bdi so we can control readahead, etc.
824 */
859e7b14 825static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
16725b9d
SW
826{
827 int err;
828
f2cf418c 829 sb->s_bdi = &client->backing_dev_info;
16725b9d
SW
830
831 /* set ra_pages based on rsize mount option? */
6b805185 832 if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
16725b9d 833 client->backing_dev_info.ra_pages =
6b805185 834 (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
16725b9d 835 >> PAGE_SHIFT;
16725b9d
SW
836 err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
837 return err;
838}
839
840static int ceph_get_sb(struct file_system_type *fs_type,
841 int flags, const char *dev_name, void *data,
842 struct vfsmount *mnt)
843{
844 struct super_block *sb;
845 struct ceph_client *client;
846 int err;
847 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
6a18be16 848 const char *path = NULL;
6b805185 849 struct ceph_mount_args *args;
16725b9d
SW
850
851 dout("ceph_get_sb\n");
6b805185
SW
852 args = parse_mount_args(flags, data, dev_name, &path);
853 if (IS_ERR(args)) {
854 err = PTR_ERR(args);
855 goto out_final;
856 }
16725b9d
SW
857
858 /* create client (which we may/may not use) */
6b805185
SW
859 client = ceph_create_client(args);
860 if (IS_ERR(client)) {
861 err = PTR_ERR(client);
862 goto out_final;
863 }
16725b9d 864
6b805185 865 if (client->mount_args->flags & CEPH_OPT_NOSHARE)
16725b9d
SW
866 compare_super = NULL;
867 sb = sget(fs_type, compare_super, ceph_set_super, client);
868 if (IS_ERR(sb)) {
869 err = PTR_ERR(sb);
870 goto out;
871 }
872
873 if (ceph_client(sb) != client) {
874 ceph_destroy_client(client);
875 client = ceph_client(sb);
876 dout("get_sb got existing client %p\n", client);
877 } else {
878 dout("get_sb using new client %p\n", client);
859e7b14 879 err = ceph_register_bdi(sb, client);
16725b9d
SW
880 if (err < 0)
881 goto out_splat;
882 }
883
884 err = ceph_mount(client, mnt, path);
885 if (err < 0)
886 goto out_splat;
887 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
888 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
889 return 0;
890
891out_splat:
892 ceph_mdsc_close_sessions(&client->mdsc);
893 up_write(&sb->s_umount);
894 deactivate_super(sb);
895 goto out_final;
896
897out:
898 ceph_destroy_client(client);
899out_final:
900 dout("ceph_get_sb fail %d\n", err);
901 return err;
902}
903
904static void ceph_kill_sb(struct super_block *s)
905{
906 struct ceph_client *client = ceph_sb_to_client(s);
907 dout("kill_sb %p\n", s);
908 ceph_mdsc_pre_umount(&client->mdsc);
16725b9d 909 kill_anon_super(s); /* will call put_super after sb is r/o */
f2cf418c 910 bdi_unregister(&client->backing_dev_info);
16725b9d
SW
911 bdi_destroy(&client->backing_dev_info);
912 ceph_destroy_client(client);
913}
914
915static struct file_system_type ceph_fs_type = {
916 .owner = THIS_MODULE,
917 .name = "ceph",
918 .get_sb = ceph_get_sb,
919 .kill_sb = ceph_kill_sb,
920 .fs_flags = FS_RENAME_DOES_D_MOVE,
921};
922
923#define _STRINGIFY(x) #x
924#define STRINGIFY(x) _STRINGIFY(x)
925
926static int __init init_ceph(void)
927{
928 int ret = 0;
929
930 ret = ceph_debugfs_init();
931 if (ret < 0)
932 goto out;
933
934 ret = ceph_msgr_init();
935 if (ret < 0)
936 goto out_debugfs;
937
938 ret = init_caches();
939 if (ret)
940 goto out_msgr;
941
942 ceph_caps_init();
943
944 ret = register_filesystem(&ceph_fs_type);
945 if (ret)
946 goto out_icache;
947
fa0b72e9
SW
948 pr_info("loaded %d.%d.%d (mon/mds/osd proto %d/%d/%d)\n",
949 CEPH_VERSION_MAJOR, CEPH_VERSION_MINOR, CEPH_VERSION_PATCH,
950 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL);
16725b9d
SW
951 return 0;
952
953out_icache:
954 destroy_caches();
955out_msgr:
956 ceph_msgr_exit();
957out_debugfs:
958 ceph_debugfs_cleanup();
959out:
960 return ret;
961}
962
963static void __exit exit_ceph(void)
964{
965 dout("exit_ceph\n");
966 unregister_filesystem(&ceph_fs_type);
967 ceph_caps_finalize();
968 destroy_caches();
969 ceph_msgr_exit();
970 ceph_debugfs_cleanup();
971}
972
973module_init(init_ceph);
974module_exit(exit_ceph);
975
976MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
977MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
978MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
979MODULE_DESCRIPTION("Ceph filesystem for Linux");
980MODULE_LICENSE("GPL");
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