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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[GitHub/mt8127/android_kernel_alcatel_ttab.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/sched.h>
12 #include <linux/seq_file.h>
13 #include <linux/slab.h>
14 #include <linux/statfs.h>
15 #include <linux/string.h>
16
17 #include "decode.h"
18 #include "super.h"
19 #include "mon_client.h"
20 #include "auth.h"
21
22 /*
23 * Ceph superblock operations
24 *
25 * Handle the basics of mounting, unmounting.
26 */
27
28
29 /*
30 * find filename portion of a path (/foo/bar/baz -> baz)
31 */
32 const char *ceph_file_part(const char *s, int len)
33 {
34 const char *e = s + len;
35
36 while (e != s && *(e-1) != '/')
37 e--;
38 return e;
39 }
40
41
42 /*
43 * super ops
44 */
45 static void ceph_put_super(struct super_block *s)
46 {
47 struct ceph_client *client = ceph_sb_to_client(s);
48
49 dout("put_super\n");
50 ceph_mdsc_close_sessions(&client->mdsc);
51
52 /*
53 * ensure we release the bdi before put_anon_super releases
54 * the device name.
55 */
56 if (s->s_bdi == &client->backing_dev_info) {
57 bdi_unregister(&client->backing_dev_info);
58 s->s_bdi = NULL;
59 }
60
61 return;
62 }
63
64 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
65 {
66 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
67 struct ceph_monmap *monmap = client->monc.monmap;
68 struct ceph_statfs st;
69 u64 fsid;
70 int err;
71
72 dout("statfs\n");
73 err = ceph_monc_do_statfs(&client->monc, &st);
74 if (err < 0)
75 return err;
76
77 /* fill in kstatfs */
78 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
79
80 /*
81 * express utilization in terms of large blocks to avoid
82 * overflow on 32-bit machines.
83 */
84 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
85 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
86 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
87 (CEPH_BLOCK_SHIFT-10);
88 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
89
90 buf->f_files = le64_to_cpu(st.num_objects);
91 buf->f_ffree = -1;
92 buf->f_namelen = PATH_MAX;
93 buf->f_frsize = PAGE_CACHE_SIZE;
94
95 /* leave fsid little-endian, regardless of host endianness */
96 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
97 buf->f_fsid.val[0] = fsid & 0xffffffff;
98 buf->f_fsid.val[1] = fsid >> 32;
99
100 return 0;
101 }
102
103
104 static int ceph_syncfs(struct super_block *sb, int wait)
105 {
106 dout("sync_fs %d\n", wait);
107 ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc);
108 ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc);
109 dout("sync_fs %d done\n", wait);
110 return 0;
111 }
112
113 static int default_congestion_kb(void)
114 {
115 int congestion_kb;
116
117 /*
118 * Copied from NFS
119 *
120 * congestion size, scale with available memory.
121 *
122 * 64MB: 8192k
123 * 128MB: 11585k
124 * 256MB: 16384k
125 * 512MB: 23170k
126 * 1GB: 32768k
127 * 2GB: 46340k
128 * 4GB: 65536k
129 * 8GB: 92681k
130 * 16GB: 131072k
131 *
132 * This allows larger machines to have larger/more transfers.
133 * Limit the default to 256M
134 */
135 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
136 if (congestion_kb > 256*1024)
137 congestion_kb = 256*1024;
138
139 return congestion_kb;
140 }
141
142 /**
143 * ceph_show_options - Show mount options in /proc/mounts
144 * @m: seq_file to write to
145 * @mnt: mount descriptor
146 */
147 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
148 {
149 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
150 struct ceph_mount_args *args = client->mount_args;
151
152 if (args->flags & CEPH_OPT_FSID)
153 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
154 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
155 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
156 if (args->flags & CEPH_OPT_NOSHARE)
157 seq_puts(m, ",noshare");
158 if (args->flags & CEPH_OPT_DIRSTAT)
159 seq_puts(m, ",dirstat");
160 if ((args->flags & CEPH_OPT_RBYTES) == 0)
161 seq_puts(m, ",norbytes");
162 if (args->flags & CEPH_OPT_NOCRC)
163 seq_puts(m, ",nocrc");
164 if (args->flags & CEPH_OPT_NOASYNCREADDIR)
165 seq_puts(m, ",noasyncreaddir");
166
167 if (args->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
168 seq_printf(m, ",mount_timeout=%d", args->mount_timeout);
169 if (args->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
170 seq_printf(m, ",osd_idle_ttl=%d", args->osd_idle_ttl);
171 if (args->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
172 seq_printf(m, ",osdtimeout=%d", args->osd_timeout);
173 if (args->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
174 seq_printf(m, ",osdkeepalivetimeout=%d",
175 args->osd_keepalive_timeout);
176 if (args->wsize)
177 seq_printf(m, ",wsize=%d", args->wsize);
178 if (args->rsize != CEPH_MOUNT_RSIZE_DEFAULT)
179 seq_printf(m, ",rsize=%d", args->rsize);
180 if (args->congestion_kb != default_congestion_kb())
181 seq_printf(m, ",write_congestion_kb=%d", args->congestion_kb);
182 if (args->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
183 seq_printf(m, ",caps_wanted_delay_min=%d",
184 args->caps_wanted_delay_min);
185 if (args->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
186 seq_printf(m, ",caps_wanted_delay_max=%d",
187 args->caps_wanted_delay_max);
188 if (args->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
189 seq_printf(m, ",cap_release_safety=%d",
190 args->cap_release_safety);
191 if (args->max_readdir != CEPH_MAX_READDIR_DEFAULT)
192 seq_printf(m, ",readdir_max_entries=%d", args->max_readdir);
193 if (args->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
194 seq_printf(m, ",readdir_max_bytes=%d", args->max_readdir_bytes);
195 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
196 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
197 if (args->name)
198 seq_printf(m, ",name=%s", args->name);
199 if (args->secret)
200 seq_puts(m, ",secret=<hidden>");
201 return 0;
202 }
203
204 /*
205 * caches
206 */
207 struct kmem_cache *ceph_inode_cachep;
208 struct kmem_cache *ceph_cap_cachep;
209 struct kmem_cache *ceph_dentry_cachep;
210 struct kmem_cache *ceph_file_cachep;
211
212 static void ceph_inode_init_once(void *foo)
213 {
214 struct ceph_inode_info *ci = foo;
215 inode_init_once(&ci->vfs_inode);
216 }
217
218 static int __init init_caches(void)
219 {
220 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
221 sizeof(struct ceph_inode_info),
222 __alignof__(struct ceph_inode_info),
223 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
224 ceph_inode_init_once);
225 if (ceph_inode_cachep == NULL)
226 return -ENOMEM;
227
228 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
229 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
230 if (ceph_cap_cachep == NULL)
231 goto bad_cap;
232
233 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
234 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
235 if (ceph_dentry_cachep == NULL)
236 goto bad_dentry;
237
238 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
239 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
240 if (ceph_file_cachep == NULL)
241 goto bad_file;
242
243 return 0;
244
245 bad_file:
246 kmem_cache_destroy(ceph_dentry_cachep);
247 bad_dentry:
248 kmem_cache_destroy(ceph_cap_cachep);
249 bad_cap:
250 kmem_cache_destroy(ceph_inode_cachep);
251 return -ENOMEM;
252 }
253
254 static void destroy_caches(void)
255 {
256 kmem_cache_destroy(ceph_inode_cachep);
257 kmem_cache_destroy(ceph_cap_cachep);
258 kmem_cache_destroy(ceph_dentry_cachep);
259 kmem_cache_destroy(ceph_file_cachep);
260 }
261
262
263 /*
264 * ceph_umount_begin - initiate forced umount. Tear down down the
265 * mount, skipping steps that may hang while waiting for server(s).
266 */
267 static void ceph_umount_begin(struct super_block *sb)
268 {
269 struct ceph_client *client = ceph_sb_to_client(sb);
270
271 dout("ceph_umount_begin - starting forced umount\n");
272 if (!client)
273 return;
274 client->mount_state = CEPH_MOUNT_SHUTDOWN;
275 return;
276 }
277
278 static const struct super_operations ceph_super_ops = {
279 .alloc_inode = ceph_alloc_inode,
280 .destroy_inode = ceph_destroy_inode,
281 .write_inode = ceph_write_inode,
282 .sync_fs = ceph_syncfs,
283 .put_super = ceph_put_super,
284 .show_options = ceph_show_options,
285 .statfs = ceph_statfs,
286 .umount_begin = ceph_umount_begin,
287 };
288
289
290 const char *ceph_msg_type_name(int type)
291 {
292 switch (type) {
293 case CEPH_MSG_SHUTDOWN: return "shutdown";
294 case CEPH_MSG_PING: return "ping";
295 case CEPH_MSG_AUTH: return "auth";
296 case CEPH_MSG_AUTH_REPLY: return "auth_reply";
297 case CEPH_MSG_MON_MAP: return "mon_map";
298 case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
299 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
300 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
301 case CEPH_MSG_STATFS: return "statfs";
302 case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
303 case CEPH_MSG_MDS_MAP: return "mds_map";
304 case CEPH_MSG_CLIENT_SESSION: return "client_session";
305 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
306 case CEPH_MSG_CLIENT_REQUEST: return "client_request";
307 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
308 case CEPH_MSG_CLIENT_REPLY: return "client_reply";
309 case CEPH_MSG_CLIENT_CAPS: return "client_caps";
310 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
311 case CEPH_MSG_CLIENT_SNAP: return "client_snap";
312 case CEPH_MSG_CLIENT_LEASE: return "client_lease";
313 case CEPH_MSG_OSD_MAP: return "osd_map";
314 case CEPH_MSG_OSD_OP: return "osd_op";
315 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
316 default: return "unknown";
317 }
318 }
319
320
321 /*
322 * mount options
323 */
324 enum {
325 Opt_fsidmajor,
326 Opt_fsidminor,
327 Opt_monport,
328 Opt_wsize,
329 Opt_rsize,
330 Opt_osdtimeout,
331 Opt_osdkeepalivetimeout,
332 Opt_mount_timeout,
333 Opt_osd_idle_ttl,
334 Opt_caps_wanted_delay_min,
335 Opt_caps_wanted_delay_max,
336 Opt_cap_release_safety,
337 Opt_readdir_max_entries,
338 Opt_readdir_max_bytes,
339 Opt_congestion_kb,
340 Opt_last_int,
341 /* int args above */
342 Opt_snapdirname,
343 Opt_name,
344 Opt_secret,
345 Opt_last_string,
346 /* string args above */
347 Opt_ip,
348 Opt_noshare,
349 Opt_dirstat,
350 Opt_nodirstat,
351 Opt_rbytes,
352 Opt_norbytes,
353 Opt_nocrc,
354 Opt_noasyncreaddir,
355 };
356
357 static match_table_t arg_tokens = {
358 {Opt_fsidmajor, "fsidmajor=%ld"},
359 {Opt_fsidminor, "fsidminor=%ld"},
360 {Opt_monport, "monport=%d"},
361 {Opt_wsize, "wsize=%d"},
362 {Opt_rsize, "rsize=%d"},
363 {Opt_osdtimeout, "osdtimeout=%d"},
364 {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
365 {Opt_mount_timeout, "mount_timeout=%d"},
366 {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
367 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
368 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
369 {Opt_cap_release_safety, "cap_release_safety=%d"},
370 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
371 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
372 {Opt_congestion_kb, "write_congestion_kb=%d"},
373 /* int args above */
374 {Opt_snapdirname, "snapdirname=%s"},
375 {Opt_name, "name=%s"},
376 {Opt_secret, "secret=%s"},
377 /* string args above */
378 {Opt_ip, "ip=%s"},
379 {Opt_noshare, "noshare"},
380 {Opt_dirstat, "dirstat"},
381 {Opt_nodirstat, "nodirstat"},
382 {Opt_rbytes, "rbytes"},
383 {Opt_norbytes, "norbytes"},
384 {Opt_nocrc, "nocrc"},
385 {Opt_noasyncreaddir, "noasyncreaddir"},
386 {-1, NULL}
387 };
388
389
390 static struct ceph_mount_args *parse_mount_args(int flags, char *options,
391 const char *dev_name,
392 const char **path)
393 {
394 struct ceph_mount_args *args;
395 const char *c;
396 int err = -ENOMEM;
397 substring_t argstr[MAX_OPT_ARGS];
398
399 args = kzalloc(sizeof(*args), GFP_KERNEL);
400 if (!args)
401 return ERR_PTR(-ENOMEM);
402 args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
403 GFP_KERNEL);
404 if (!args->mon_addr)
405 goto out;
406
407 dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
408
409 /* start with defaults */
410 args->sb_flags = flags;
411 args->flags = CEPH_OPT_DEFAULT;
412 args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
413 args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
414 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
415 args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */
416 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
417 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
418 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
419 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
420 args->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
421 args->max_readdir = CEPH_MAX_READDIR_DEFAULT;
422 args->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
423 args->congestion_kb = default_congestion_kb();
424
425 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
426 err = -EINVAL;
427 if (!dev_name)
428 goto out;
429 *path = strstr(dev_name, ":/");
430 if (*path == NULL) {
431 pr_err("device name is missing path (no :/ in %s)\n",
432 dev_name);
433 goto out;
434 }
435
436 /* get mon ip(s) */
437 err = ceph_parse_ips(dev_name, *path, args->mon_addr,
438 CEPH_MAX_MON, &args->num_mon);
439 if (err < 0)
440 goto out;
441
442 /* path on server */
443 *path += 2;
444 dout("server path '%s'\n", *path);
445
446 /* parse mount options */
447 while ((c = strsep(&options, ",")) != NULL) {
448 int token, intval, ret;
449 if (!*c)
450 continue;
451 err = -EINVAL;
452 token = match_token((char *)c, arg_tokens, argstr);
453 if (token < 0) {
454 pr_err("bad mount option at '%s'\n", c);
455 goto out;
456 }
457 if (token < Opt_last_int) {
458 ret = match_int(&argstr[0], &intval);
459 if (ret < 0) {
460 pr_err("bad mount option arg (not int) "
461 "at '%s'\n", c);
462 continue;
463 }
464 dout("got int token %d val %d\n", token, intval);
465 } else if (token > Opt_last_int && token < Opt_last_string) {
466 dout("got string token %d val %s\n", token,
467 argstr[0].from);
468 } else {
469 dout("got token %d\n", token);
470 }
471 switch (token) {
472 case Opt_fsidmajor:
473 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
474 break;
475 case Opt_fsidminor:
476 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
477 break;
478 case Opt_ip:
479 err = ceph_parse_ips(argstr[0].from,
480 argstr[0].to,
481 &args->my_addr,
482 1, NULL);
483 if (err < 0)
484 goto out;
485 args->flags |= CEPH_OPT_MYIP;
486 break;
487
488 case Opt_snapdirname:
489 kfree(args->snapdir_name);
490 args->snapdir_name = kstrndup(argstr[0].from,
491 argstr[0].to-argstr[0].from,
492 GFP_KERNEL);
493 break;
494 case Opt_name:
495 args->name = kstrndup(argstr[0].from,
496 argstr[0].to-argstr[0].from,
497 GFP_KERNEL);
498 break;
499 case Opt_secret:
500 args->secret = kstrndup(argstr[0].from,
501 argstr[0].to-argstr[0].from,
502 GFP_KERNEL);
503 break;
504
505 /* misc */
506 case Opt_wsize:
507 args->wsize = intval;
508 break;
509 case Opt_rsize:
510 args->rsize = intval;
511 break;
512 case Opt_osdtimeout:
513 args->osd_timeout = intval;
514 break;
515 case Opt_osdkeepalivetimeout:
516 args->osd_keepalive_timeout = intval;
517 break;
518 case Opt_mount_timeout:
519 args->mount_timeout = intval;
520 break;
521 case Opt_caps_wanted_delay_min:
522 args->caps_wanted_delay_min = intval;
523 break;
524 case Opt_caps_wanted_delay_max:
525 args->caps_wanted_delay_max = intval;
526 break;
527 case Opt_readdir_max_entries:
528 args->max_readdir = intval;
529 break;
530 case Opt_readdir_max_bytes:
531 args->max_readdir_bytes = intval;
532 break;
533 case Opt_congestion_kb:
534 args->congestion_kb = intval;
535 break;
536
537 case Opt_noshare:
538 args->flags |= CEPH_OPT_NOSHARE;
539 break;
540
541 case Opt_dirstat:
542 args->flags |= CEPH_OPT_DIRSTAT;
543 break;
544 case Opt_nodirstat:
545 args->flags &= ~CEPH_OPT_DIRSTAT;
546 break;
547 case Opt_rbytes:
548 args->flags |= CEPH_OPT_RBYTES;
549 break;
550 case Opt_norbytes:
551 args->flags &= ~CEPH_OPT_RBYTES;
552 break;
553 case Opt_nocrc:
554 args->flags |= CEPH_OPT_NOCRC;
555 break;
556 case Opt_noasyncreaddir:
557 args->flags |= CEPH_OPT_NOASYNCREADDIR;
558 break;
559
560 default:
561 BUG_ON(token);
562 }
563 }
564 return args;
565
566 out:
567 kfree(args->mon_addr);
568 kfree(args);
569 return ERR_PTR(err);
570 }
571
572 static void destroy_mount_args(struct ceph_mount_args *args)
573 {
574 dout("destroy_mount_args %p\n", args);
575 kfree(args->snapdir_name);
576 args->snapdir_name = NULL;
577 kfree(args->name);
578 args->name = NULL;
579 kfree(args->secret);
580 args->secret = NULL;
581 kfree(args);
582 }
583
584 /*
585 * create a fresh client instance
586 */
587 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
588 {
589 struct ceph_client *client;
590 int err = -ENOMEM;
591
592 client = kzalloc(sizeof(*client), GFP_KERNEL);
593 if (client == NULL)
594 return ERR_PTR(-ENOMEM);
595
596 mutex_init(&client->mount_mutex);
597
598 init_waitqueue_head(&client->auth_wq);
599
600 client->sb = NULL;
601 client->mount_state = CEPH_MOUNT_MOUNTING;
602 client->mount_args = args;
603
604 client->msgr = NULL;
605
606 client->auth_err = 0;
607 atomic_long_set(&client->writeback_count, 0);
608
609 err = bdi_init(&client->backing_dev_info);
610 if (err < 0)
611 goto fail;
612
613 err = -ENOMEM;
614 client->wb_wq = create_workqueue("ceph-writeback");
615 if (client->wb_wq == NULL)
616 goto fail_bdi;
617 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
618 if (client->pg_inv_wq == NULL)
619 goto fail_wb_wq;
620 client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
621 if (client->trunc_wq == NULL)
622 goto fail_pg_inv_wq;
623
624 /* set up mempools */
625 err = -ENOMEM;
626 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
627 client->mount_args->wsize >> PAGE_CACHE_SHIFT);
628 if (!client->wb_pagevec_pool)
629 goto fail_trunc_wq;
630
631 /* caps */
632 client->min_caps = args->max_readdir;
633 ceph_adjust_min_caps(client->min_caps);
634
635 /* subsystems */
636 err = ceph_monc_init(&client->monc, client);
637 if (err < 0)
638 goto fail_mempool;
639 err = ceph_osdc_init(&client->osdc, client);
640 if (err < 0)
641 goto fail_monc;
642 err = ceph_mdsc_init(&client->mdsc, client);
643 if (err < 0)
644 goto fail_osdc;
645 return client;
646
647 fail_osdc:
648 ceph_osdc_stop(&client->osdc);
649 fail_monc:
650 ceph_monc_stop(&client->monc);
651 fail_mempool:
652 mempool_destroy(client->wb_pagevec_pool);
653 fail_trunc_wq:
654 destroy_workqueue(client->trunc_wq);
655 fail_pg_inv_wq:
656 destroy_workqueue(client->pg_inv_wq);
657 fail_wb_wq:
658 destroy_workqueue(client->wb_wq);
659 fail_bdi:
660 bdi_destroy(&client->backing_dev_info);
661 fail:
662 kfree(client);
663 return ERR_PTR(err);
664 }
665
666 static void ceph_destroy_client(struct ceph_client *client)
667 {
668 dout("destroy_client %p\n", client);
669
670 /* unmount */
671 ceph_mdsc_stop(&client->mdsc);
672 ceph_osdc_stop(&client->osdc);
673
674 /*
675 * make sure mds and osd connections close out before destroying
676 * the auth module, which is needed to free those connections'
677 * ceph_authorizers.
678 */
679 ceph_msgr_flush();
680
681 ceph_monc_stop(&client->monc);
682
683 ceph_adjust_min_caps(-client->min_caps);
684
685 ceph_debugfs_client_cleanup(client);
686 destroy_workqueue(client->wb_wq);
687 destroy_workqueue(client->pg_inv_wq);
688 destroy_workqueue(client->trunc_wq);
689
690 bdi_destroy(&client->backing_dev_info);
691
692 if (client->msgr)
693 ceph_messenger_destroy(client->msgr);
694 mempool_destroy(client->wb_pagevec_pool);
695
696 destroy_mount_args(client->mount_args);
697
698 kfree(client);
699 dout("destroy_client %p done\n", client);
700 }
701
702 /*
703 * Initially learn our fsid, or verify an fsid matches.
704 */
705 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
706 {
707 if (client->have_fsid) {
708 if (ceph_fsid_compare(&client->fsid, fsid)) {
709 pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
710 PR_FSID(&client->fsid), PR_FSID(fsid));
711 return -1;
712 }
713 } else {
714 pr_info("client%lld fsid " FSID_FORMAT "\n",
715 client->monc.auth->global_id, PR_FSID(fsid));
716 memcpy(&client->fsid, fsid, sizeof(*fsid));
717 ceph_debugfs_client_init(client);
718 client->have_fsid = true;
719 }
720 return 0;
721 }
722
723 /*
724 * true if we have the mon map (and have thus joined the cluster)
725 */
726 static int have_mon_and_osd_map(struct ceph_client *client)
727 {
728 return client->monc.monmap && client->monc.monmap->epoch &&
729 client->osdc.osdmap && client->osdc.osdmap->epoch;
730 }
731
732 /*
733 * Bootstrap mount by opening the root directory. Note the mount
734 * @started time from caller, and time out if this takes too long.
735 */
736 static struct dentry *open_root_dentry(struct ceph_client *client,
737 const char *path,
738 unsigned long started)
739 {
740 struct ceph_mds_client *mdsc = &client->mdsc;
741 struct ceph_mds_request *req = NULL;
742 int err;
743 struct dentry *root;
744
745 /* open dir */
746 dout("open_root_inode opening '%s'\n", path);
747 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
748 if (IS_ERR(req))
749 return ERR_CAST(req);
750 req->r_path1 = kstrdup(path, GFP_NOFS);
751 req->r_ino1.ino = CEPH_INO_ROOT;
752 req->r_ino1.snap = CEPH_NOSNAP;
753 req->r_started = started;
754 req->r_timeout = client->mount_args->mount_timeout * HZ;
755 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
756 req->r_num_caps = 2;
757 err = ceph_mdsc_do_request(mdsc, NULL, req);
758 if (err == 0) {
759 dout("open_root_inode success\n");
760 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
761 client->sb->s_root == NULL)
762 root = d_alloc_root(req->r_target_inode);
763 else
764 root = d_obtain_alias(req->r_target_inode);
765 req->r_target_inode = NULL;
766 dout("open_root_inode success, root dentry is %p\n", root);
767 } else {
768 root = ERR_PTR(err);
769 }
770 ceph_mdsc_put_request(req);
771 return root;
772 }
773
774 /*
775 * mount: join the ceph cluster, and open root directory.
776 */
777 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
778 const char *path)
779 {
780 struct ceph_entity_addr *myaddr = NULL;
781 int err;
782 unsigned long timeout = client->mount_args->mount_timeout * HZ;
783 unsigned long started = jiffies; /* note the start time */
784 struct dentry *root;
785
786 dout("mount start\n");
787 mutex_lock(&client->mount_mutex);
788
789 /* initialize the messenger */
790 if (client->msgr == NULL) {
791 if (ceph_test_opt(client, MYIP))
792 myaddr = &client->mount_args->my_addr;
793 client->msgr = ceph_messenger_create(myaddr);
794 if (IS_ERR(client->msgr)) {
795 err = PTR_ERR(client->msgr);
796 client->msgr = NULL;
797 goto out;
798 }
799 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
800 }
801
802 /* open session, and wait for mon, mds, and osd maps */
803 err = ceph_monc_open_session(&client->monc);
804 if (err < 0)
805 goto out;
806
807 while (!have_mon_and_osd_map(client)) {
808 err = -EIO;
809 if (timeout && time_after_eq(jiffies, started + timeout))
810 goto out;
811
812 /* wait */
813 dout("mount waiting for mon_map\n");
814 err = wait_event_interruptible_timeout(client->auth_wq,
815 have_mon_and_osd_map(client) || (client->auth_err < 0),
816 timeout);
817 if (err == -EINTR || err == -ERESTARTSYS)
818 goto out;
819 if (client->auth_err < 0) {
820 err = client->auth_err;
821 goto out;
822 }
823 }
824
825 dout("mount opening root\n");
826 root = open_root_dentry(client, "", started);
827 if (IS_ERR(root)) {
828 err = PTR_ERR(root);
829 goto out;
830 }
831 if (client->sb->s_root)
832 dput(root);
833 else
834 client->sb->s_root = root;
835
836 if (path[0] == 0) {
837 dget(root);
838 } else {
839 dout("mount opening base mountpoint\n");
840 root = open_root_dentry(client, path, started);
841 if (IS_ERR(root)) {
842 err = PTR_ERR(root);
843 dput(client->sb->s_root);
844 client->sb->s_root = NULL;
845 goto out;
846 }
847 }
848
849 mnt->mnt_root = root;
850 mnt->mnt_sb = client->sb;
851
852 client->mount_state = CEPH_MOUNT_MOUNTED;
853 dout("mount success\n");
854 err = 0;
855
856 out:
857 mutex_unlock(&client->mount_mutex);
858 return err;
859 }
860
861 static int ceph_set_super(struct super_block *s, void *data)
862 {
863 struct ceph_client *client = data;
864 int ret;
865
866 dout("set_super %p data %p\n", s, data);
867
868 s->s_flags = client->mount_args->sb_flags;
869 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
870
871 s->s_fs_info = client;
872 client->sb = s;
873
874 s->s_op = &ceph_super_ops;
875 s->s_export_op = &ceph_export_ops;
876
877 s->s_time_gran = 1000; /* 1000 ns == 1 us */
878
879 ret = set_anon_super(s, NULL); /* what is that second arg for? */
880 if (ret != 0)
881 goto fail;
882
883 return ret;
884
885 fail:
886 s->s_fs_info = NULL;
887 client->sb = NULL;
888 return ret;
889 }
890
891 /*
892 * share superblock if same fs AND options
893 */
894 static int ceph_compare_super(struct super_block *sb, void *data)
895 {
896 struct ceph_client *new = data;
897 struct ceph_mount_args *args = new->mount_args;
898 struct ceph_client *other = ceph_sb_to_client(sb);
899 int i;
900
901 dout("ceph_compare_super %p\n", sb);
902 if (args->flags & CEPH_OPT_FSID) {
903 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
904 dout("fsid doesn't match\n");
905 return 0;
906 }
907 } else {
908 /* do we share (a) monitor? */
909 for (i = 0; i < new->monc.monmap->num_mon; i++)
910 if (ceph_monmap_contains(other->monc.monmap,
911 &new->monc.monmap->mon_inst[i].addr))
912 break;
913 if (i == new->monc.monmap->num_mon) {
914 dout("mon ip not part of monmap\n");
915 return 0;
916 }
917 dout("mon ip matches existing sb %p\n", sb);
918 }
919 if (args->sb_flags != other->mount_args->sb_flags) {
920 dout("flags differ\n");
921 return 0;
922 }
923 return 1;
924 }
925
926 /*
927 * construct our own bdi so we can control readahead, etc.
928 */
929 static atomic_long_t bdi_seq = ATOMIC_INIT(0);
930
931 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
932 {
933 int err;
934
935 /* set ra_pages based on rsize mount option? */
936 if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
937 client->backing_dev_info.ra_pages =
938 (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
939 >> PAGE_SHIFT;
940 err = bdi_register(&client->backing_dev_info, NULL, "ceph-%d",
941 atomic_long_inc_return(&bdi_seq));
942 if (!err)
943 sb->s_bdi = &client->backing_dev_info;
944 return err;
945 }
946
947 static int ceph_get_sb(struct file_system_type *fs_type,
948 int flags, const char *dev_name, void *data,
949 struct vfsmount *mnt)
950 {
951 struct super_block *sb;
952 struct ceph_client *client;
953 int err;
954 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
955 const char *path = NULL;
956 struct ceph_mount_args *args;
957
958 dout("ceph_get_sb\n");
959 args = parse_mount_args(flags, data, dev_name, &path);
960 if (IS_ERR(args)) {
961 err = PTR_ERR(args);
962 goto out_final;
963 }
964
965 /* create client (which we may/may not use) */
966 client = ceph_create_client(args);
967 if (IS_ERR(client)) {
968 err = PTR_ERR(client);
969 goto out_final;
970 }
971
972 if (client->mount_args->flags & CEPH_OPT_NOSHARE)
973 compare_super = NULL;
974 sb = sget(fs_type, compare_super, ceph_set_super, client);
975 if (IS_ERR(sb)) {
976 err = PTR_ERR(sb);
977 goto out;
978 }
979
980 if (ceph_sb_to_client(sb) != client) {
981 ceph_destroy_client(client);
982 client = ceph_sb_to_client(sb);
983 dout("get_sb got existing client %p\n", client);
984 } else {
985 dout("get_sb using new client %p\n", client);
986 err = ceph_register_bdi(sb, client);
987 if (err < 0)
988 goto out_splat;
989 }
990
991 err = ceph_mount(client, mnt, path);
992 if (err < 0)
993 goto out_splat;
994 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
995 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
996 return 0;
997
998 out_splat:
999 ceph_mdsc_close_sessions(&client->mdsc);
1000 deactivate_locked_super(sb);
1001 goto out_final;
1002
1003 out:
1004 ceph_destroy_client(client);
1005 out_final:
1006 dout("ceph_get_sb fail %d\n", err);
1007 return err;
1008 }
1009
1010 static void ceph_kill_sb(struct super_block *s)
1011 {
1012 struct ceph_client *client = ceph_sb_to_client(s);
1013 dout("kill_sb %p\n", s);
1014 ceph_mdsc_pre_umount(&client->mdsc);
1015 kill_anon_super(s); /* will call put_super after sb is r/o */
1016 ceph_destroy_client(client);
1017 }
1018
1019 static struct file_system_type ceph_fs_type = {
1020 .owner = THIS_MODULE,
1021 .name = "ceph",
1022 .get_sb = ceph_get_sb,
1023 .kill_sb = ceph_kill_sb,
1024 .fs_flags = FS_RENAME_DOES_D_MOVE,
1025 };
1026
1027 #define _STRINGIFY(x) #x
1028 #define STRINGIFY(x) _STRINGIFY(x)
1029
1030 static int __init init_ceph(void)
1031 {
1032 int ret = 0;
1033
1034 ret = ceph_debugfs_init();
1035 if (ret < 0)
1036 goto out;
1037
1038 ret = ceph_msgr_init();
1039 if (ret < 0)
1040 goto out_debugfs;
1041
1042 ret = init_caches();
1043 if (ret)
1044 goto out_msgr;
1045
1046 ceph_caps_init();
1047
1048 ret = register_filesystem(&ceph_fs_type);
1049 if (ret)
1050 goto out_icache;
1051
1052 pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n",
1053 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL,
1054 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
1055 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
1056 return 0;
1057
1058 out_icache:
1059 destroy_caches();
1060 out_msgr:
1061 ceph_msgr_exit();
1062 out_debugfs:
1063 ceph_debugfs_cleanup();
1064 out:
1065 return ret;
1066 }
1067
1068 static void __exit exit_ceph(void)
1069 {
1070 dout("exit_ceph\n");
1071 unregister_filesystem(&ceph_fs_type);
1072 ceph_caps_finalize();
1073 destroy_caches();
1074 ceph_msgr_exit();
1075 ceph_debugfs_cleanup();
1076 }
1077
1078 module_init(init_ceph);
1079 module_exit(exit_ceph);
1080
1081 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1082 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1083 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1084 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1085 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)