blob: 442a9900317eee4db560a056baecd2eefb83ee7a [file] [log] [blame]
Sage Weil16725b92009-10-06 11:31:07 -07001
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
Sage Weil16725b92009-10-06 11:31:07 -070019#include "decode.h"
20#include "super.h"
21#include "mon_client.h"
22
23/*
24 * Ceph superblock operations
25 *
26 * Handle the basics of mounting, unmounting.
27 */
28
29
30/*
31 * find filename portion of a path (/foo/bar/baz -> baz)
32 */
33const char *ceph_file_part(const char *s, int len)
34{
35 const char *e = s + len;
36
37 while (e != s && *(e-1) != '/')
38 e--;
39 return e;
40}
41
42
43/*
44 * super ops
45 */
46static void ceph_put_super(struct super_block *s)
47{
48 struct ceph_client *cl = ceph_client(s);
49
50 dout("put_super\n");
51 ceph_mdsc_close_sessions(&cl->mdsc);
52 return;
53}
54
55static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
56{
57 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
58 struct ceph_monmap *monmap = client->monc.monmap;
59 struct ceph_statfs st;
60 u64 fsid;
61 int err;
62
63 dout("statfs\n");
64 err = ceph_monc_do_statfs(&client->monc, &st);
65 if (err < 0)
66 return err;
67
68 /* fill in kstatfs */
69 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
70
71 /*
72 * express utilization in terms of large blocks to avoid
73 * overflow on 32-bit machines.
74 */
75 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
76 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
77 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
78 (CEPH_BLOCK_SHIFT-10);
79 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
80
81 buf->f_files = le64_to_cpu(st.num_objects);
82 buf->f_ffree = -1;
83 buf->f_namelen = PATH_MAX;
84 buf->f_frsize = PAGE_CACHE_SIZE;
85
86 /* leave fsid little-endian, regardless of host endianness */
87 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
88 buf->f_fsid.val[0] = fsid & 0xffffffff;
89 buf->f_fsid.val[1] = fsid >> 32;
90
91 return 0;
92}
93
94
95static int ceph_syncfs(struct super_block *sb, int wait)
96{
97 dout("sync_fs %d\n", wait);
98 ceph_osdc_sync(&ceph_client(sb)->osdc);
99 ceph_mdsc_sync(&ceph_client(sb)->mdsc);
100 return 0;
101}
102
103
104/**
105 * ceph_show_options - Show mount options in /proc/mounts
106 * @m: seq_file to write to
107 * @mnt: mount descriptor
108 */
109static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
110{
111 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
112 struct ceph_mount_args *args = &client->mount_args;
113
114 if (args->flags & CEPH_OPT_FSID)
115 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
116 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
117 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
118 if (args->flags & CEPH_OPT_NOSHARE)
119 seq_puts(m, ",noshare");
120 if (args->flags & CEPH_OPT_DIRSTAT)
121 seq_puts(m, ",dirstat");
122 if ((args->flags & CEPH_OPT_RBYTES) == 0)
123 seq_puts(m, ",norbytes");
124 if (args->flags & CEPH_OPT_NOCRC)
125 seq_puts(m, ",nocrc");
126 if (args->flags & CEPH_OPT_NOASYNCREADDIR)
127 seq_puts(m, ",noasyncreaddir");
128 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
129 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
130 if (args->secret)
131 seq_puts(m, ",secret=<hidden>");
132 return 0;
133}
134
135/*
136 * caches
137 */
138struct kmem_cache *ceph_inode_cachep;
139struct kmem_cache *ceph_cap_cachep;
140struct kmem_cache *ceph_dentry_cachep;
141struct kmem_cache *ceph_file_cachep;
142
143static void ceph_inode_init_once(void *foo)
144{
145 struct ceph_inode_info *ci = foo;
146 inode_init_once(&ci->vfs_inode);
147}
148
149static int __init init_caches(void)
150{
151 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
152 sizeof(struct ceph_inode_info),
153 __alignof__(struct ceph_inode_info),
154 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
155 ceph_inode_init_once);
156 if (ceph_inode_cachep == NULL)
157 return -ENOMEM;
158
159 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
160 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
161 if (ceph_cap_cachep == NULL)
162 goto bad_cap;
163
164 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
165 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
166 if (ceph_dentry_cachep == NULL)
167 goto bad_dentry;
168
169 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
170 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
171 if (ceph_file_cachep == NULL)
172 goto bad_file;
173
174 return 0;
175
176bad_file:
177 kmem_cache_destroy(ceph_dentry_cachep);
178bad_dentry:
179 kmem_cache_destroy(ceph_cap_cachep);
180bad_cap:
181 kmem_cache_destroy(ceph_inode_cachep);
182 return -ENOMEM;
183}
184
185static void destroy_caches(void)
186{
187 kmem_cache_destroy(ceph_inode_cachep);
188 kmem_cache_destroy(ceph_cap_cachep);
189 kmem_cache_destroy(ceph_dentry_cachep);
190 kmem_cache_destroy(ceph_file_cachep);
191}
192
193
194/*
195 * ceph_umount_begin - initiate forced umount. Tear down down the
196 * mount, skipping steps that may hang while waiting for server(s).
197 */
198static void ceph_umount_begin(struct super_block *sb)
199{
200 struct ceph_client *client = ceph_sb_to_client(sb);
201
202 dout("ceph_umount_begin - starting forced umount\n");
203 if (!client)
204 return;
205 client->mount_state = CEPH_MOUNT_SHUTDOWN;
206 return;
207}
208
209static const struct super_operations ceph_super_ops = {
210 .alloc_inode = ceph_alloc_inode,
211 .destroy_inode = ceph_destroy_inode,
212 .write_inode = ceph_write_inode,
213 .sync_fs = ceph_syncfs,
214 .put_super = ceph_put_super,
215 .show_options = ceph_show_options,
216 .statfs = ceph_statfs,
217 .umount_begin = ceph_umount_begin,
218};
219
220
221const char *ceph_msg_type_name(int type)
222{
223 switch (type) {
224 case CEPH_MSG_SHUTDOWN: return "shutdown";
225 case CEPH_MSG_PING: return "ping";
226 case CEPH_MSG_MON_MAP: return "mon_map";
227 case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
228 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
229 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
230 case CEPH_MSG_CLIENT_MOUNT: return "client_mount";
231 case CEPH_MSG_CLIENT_MOUNT_ACK: return "client_mount_ack";
232 case CEPH_MSG_STATFS: return "statfs";
233 case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
Sage Weil16725b92009-10-06 11:31:07 -0700234 case CEPH_MSG_MDS_MAP: return "mds_map";
235 case CEPH_MSG_CLIENT_SESSION: return "client_session";
236 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
237 case CEPH_MSG_CLIENT_REQUEST: return "client_request";
238 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
239 case CEPH_MSG_CLIENT_REPLY: return "client_reply";
240 case CEPH_MSG_CLIENT_CAPS: return "client_caps";
241 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
242 case CEPH_MSG_CLIENT_SNAP: return "client_snap";
243 case CEPH_MSG_CLIENT_LEASE: return "client_lease";
Sage Weil16725b92009-10-06 11:31:07 -0700244 case CEPH_MSG_OSD_MAP: return "osd_map";
245 case CEPH_MSG_OSD_OP: return "osd_op";
246 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
247 default: return "unknown";
248 }
249}
250
251
252/*
253 * mount options
254 */
255enum {
256 Opt_fsidmajor,
257 Opt_fsidminor,
258 Opt_monport,
259 Opt_wsize,
260 Opt_rsize,
261 Opt_osdtimeout,
262 Opt_mount_timeout,
263 Opt_caps_wanted_delay_min,
264 Opt_caps_wanted_delay_max,
265 Opt_readdir_max_entries,
266 /* int args above */
267 Opt_snapdirname,
268 Opt_secret,
269 /* string args above */
270 Opt_ip,
271 Opt_noshare,
272 Opt_dirstat,
273 Opt_nodirstat,
274 Opt_rbytes,
275 Opt_norbytes,
276 Opt_nocrc,
277 Opt_noasyncreaddir,
278};
279
280static match_table_t arg_tokens = {
281 {Opt_fsidmajor, "fsidmajor=%ld"},
282 {Opt_fsidminor, "fsidminor=%ld"},
283 {Opt_monport, "monport=%d"},
284 {Opt_wsize, "wsize=%d"},
285 {Opt_rsize, "rsize=%d"},
286 {Opt_osdtimeout, "osdtimeout=%d"},
287 {Opt_mount_timeout, "mount_timeout=%d"},
288 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
289 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
290 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
291 /* int args above */
292 {Opt_snapdirname, "snapdirname=%s"},
293 {Opt_secret, "secret=%s"},
294 /* string args above */
295 {Opt_ip, "ip=%s"},
296 {Opt_noshare, "noshare"},
297 {Opt_dirstat, "dirstat"},
298 {Opt_nodirstat, "nodirstat"},
299 {Opt_rbytes, "rbytes"},
300 {Opt_norbytes, "norbytes"},
301 {Opt_nocrc, "nocrc"},
302 {Opt_noasyncreaddir, "noasyncreaddir"},
303 {-1, NULL}
304};
305
306
307static int parse_mount_args(struct ceph_client *client,
308 int flags, char *options, const char *dev_name,
309 const char **path)
310{
311 struct ceph_mount_args *args = &client->mount_args;
312 const char *c;
313 int err;
314 substring_t argstr[MAX_OPT_ARGS];
315 int num_mon;
316 struct ceph_entity_addr mon_addr[CEPH_MAX_MON_MOUNT_ADDR];
317 int i;
318
319 dout("parse_mount_args dev_name '%s'\n", dev_name);
320 memset(args, 0, sizeof(*args));
321
322 /* start with defaults */
323 args->sb_flags = flags;
324 args->flags = CEPH_OPT_DEFAULT;
325 args->osd_timeout = 5; /* seconds */
326 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
327 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
328 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
329 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
330 args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
331 args->max_readdir = 1024;
332
333 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
334 if (!dev_name)
335 return -EINVAL;
336 *path = strstr(dev_name, ":/");
337 if (*path == NULL) {
338 pr_err("device name is missing path (no :/ in %s)\n",
339 dev_name);
340 return -EINVAL;
341 }
342
343 /* get mon ip(s) */
344 err = ceph_parse_ips(dev_name, *path, mon_addr,
345 CEPH_MAX_MON_MOUNT_ADDR, &num_mon);
346 if (err < 0)
347 return err;
348
349 /* build initial monmap */
350 client->monc.monmap = kzalloc(sizeof(*client->monc.monmap) +
351 num_mon*sizeof(client->monc.monmap->mon_inst[0]),
352 GFP_KERNEL);
353 if (!client->monc.monmap)
354 return -ENOMEM;
355 for (i = 0; i < num_mon; i++) {
356 client->monc.monmap->mon_inst[i].addr = mon_addr[i];
357 client->monc.monmap->mon_inst[i].addr.erank = 0;
358 client->monc.monmap->mon_inst[i].addr.nonce = 0;
359 client->monc.monmap->mon_inst[i].name.type =
360 CEPH_ENTITY_TYPE_MON;
361 client->monc.monmap->mon_inst[i].name.num = cpu_to_le64(i);
362 }
363 client->monc.monmap->num_mon = num_mon;
364 memset(&args->my_addr.in_addr, 0, sizeof(args->my_addr.in_addr));
365
366 /* path on server */
367 *path += 2;
368 dout("server path '%s'\n", *path);
369
370 /* parse mount options */
371 while ((c = strsep(&options, ",")) != NULL) {
372 int token, intval, ret;
373 if (!*c)
374 continue;
375 token = match_token((char *)c, arg_tokens, argstr);
376 if (token < 0) {
377 pr_err("bad mount option at '%s'\n", c);
378 return -EINVAL;
379
380 }
381 if (token < Opt_ip) {
382 ret = match_int(&argstr[0], &intval);
383 if (ret < 0) {
384 pr_err("bad mount option arg (not int) "
385 "at '%s'\n", c);
386 continue;
387 }
388 dout("got token %d intval %d\n", token, intval);
389 }
390 switch (token) {
391 case Opt_fsidmajor:
392 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
393 break;
394 case Opt_fsidminor:
395 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
396 break;
397 case Opt_ip:
398 err = ceph_parse_ips(argstr[0].from,
399 argstr[0].to,
400 &args->my_addr,
401 1, NULL);
402 if (err < 0)
403 return err;
404 args->flags |= CEPH_OPT_MYIP;
405 break;
406
407 case Opt_snapdirname:
408 kfree(args->snapdir_name);
409 args->snapdir_name = kstrndup(argstr[0].from,
410 argstr[0].to-argstr[0].from,
411 GFP_KERNEL);
412 break;
413 case Opt_secret:
414 args->secret = kstrndup(argstr[0].from,
415 argstr[0].to-argstr[0].from,
416 GFP_KERNEL);
417 break;
418
419 /* misc */
420 case Opt_wsize:
421 args->wsize = intval;
422 break;
423 case Opt_rsize:
424 args->rsize = intval;
425 break;
426 case Opt_osdtimeout:
427 args->osd_timeout = intval;
428 break;
429 case Opt_mount_timeout:
430 args->mount_timeout = intval;
431 break;
432 case Opt_caps_wanted_delay_min:
433 args->caps_wanted_delay_min = intval;
434 break;
435 case Opt_caps_wanted_delay_max:
436 args->caps_wanted_delay_max = intval;
437 break;
438 case Opt_readdir_max_entries:
439 args->max_readdir = intval;
440 break;
441
442 case Opt_noshare:
443 args->flags |= CEPH_OPT_NOSHARE;
444 break;
445
446 case Opt_dirstat:
447 args->flags |= CEPH_OPT_DIRSTAT;
448 break;
449 case Opt_nodirstat:
450 args->flags &= ~CEPH_OPT_DIRSTAT;
451 break;
452 case Opt_rbytes:
453 args->flags |= CEPH_OPT_RBYTES;
454 break;
455 case Opt_norbytes:
456 args->flags &= ~CEPH_OPT_RBYTES;
457 break;
458 case Opt_nocrc:
459 args->flags |= CEPH_OPT_NOCRC;
460 break;
461 case Opt_noasyncreaddir:
462 args->flags |= CEPH_OPT_NOASYNCREADDIR;
463 break;
464
465 default:
466 BUG_ON(token);
467 }
468 }
469
470 return 0;
471}
472
473static void release_mount_args(struct ceph_mount_args *args)
474{
475 kfree(args->snapdir_name);
476 args->snapdir_name = NULL;
477 kfree(args->secret);
478 args->secret = NULL;
479}
480
481/*
482 * create a fresh client instance
483 */
484static struct ceph_client *ceph_create_client(void)
485{
486 struct ceph_client *client;
487 int err = -ENOMEM;
488
489 client = kzalloc(sizeof(*client), GFP_KERNEL);
490 if (client == NULL)
491 return ERR_PTR(-ENOMEM);
492
493 mutex_init(&client->mount_mutex);
494
495 init_waitqueue_head(&client->mount_wq);
496
497 client->sb = NULL;
498 client->mount_state = CEPH_MOUNT_MOUNTING;
499 client->whoami = -1;
500
501 client->msgr = NULL;
502
503 client->mount_err = 0;
504 client->signed_ticket = NULL;
505 client->signed_ticket_len = 0;
506
507 err = -ENOMEM;
508 client->wb_wq = create_workqueue("ceph-writeback");
509 if (client->wb_wq == NULL)
510 goto fail;
511 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
512 if (client->pg_inv_wq == NULL)
513 goto fail_wb_wq;
514 client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
515 if (client->trunc_wq == NULL)
516 goto fail_pg_inv_wq;
517
518 /* subsystems */
519 err = ceph_monc_init(&client->monc, client);
520 if (err < 0)
521 goto fail_trunc_wq;
522 err = ceph_osdc_init(&client->osdc, client);
523 if (err < 0)
524 goto fail_monc;
525 ceph_mdsc_init(&client->mdsc, client);
526 return client;
527
528fail_monc:
529 ceph_monc_stop(&client->monc);
530fail_trunc_wq:
531 destroy_workqueue(client->trunc_wq);
532fail_pg_inv_wq:
533 destroy_workqueue(client->pg_inv_wq);
534fail_wb_wq:
535 destroy_workqueue(client->wb_wq);
536fail:
537 kfree(client);
538 return ERR_PTR(err);
539}
540
541static void ceph_destroy_client(struct ceph_client *client)
542{
543 dout("destroy_client %p\n", client);
544
545 /* unmount */
546 ceph_mdsc_stop(&client->mdsc);
547 ceph_monc_stop(&client->monc);
548 ceph_osdc_stop(&client->osdc);
549
550 kfree(client->signed_ticket);
551
552 ceph_debugfs_client_cleanup(client);
553 destroy_workqueue(client->wb_wq);
554 destroy_workqueue(client->pg_inv_wq);
555 destroy_workqueue(client->trunc_wq);
556
557 if (client->msgr)
558 ceph_messenger_destroy(client->msgr);
559 if (client->wb_pagevec_pool)
560 mempool_destroy(client->wb_pagevec_pool);
561
562 release_mount_args(&client->mount_args);
563
564 kfree(client);
565 dout("destroy_client %p done\n", client);
566}
567
568/*
569 * true if we have the mon map (and have thus joined the cluster)
570 */
571static int have_mon_map(struct ceph_client *client)
572{
573 return client->monc.monmap && client->monc.monmap->epoch;
574}
575
576/*
577 * Bootstrap mount by opening the root directory. Note the mount
578 * @started time from caller, and time out if this takes too long.
579 */
580static struct dentry *open_root_dentry(struct ceph_client *client,
581 const char *path,
582 unsigned long started)
583{
584 struct ceph_mds_client *mdsc = &client->mdsc;
585 struct ceph_mds_request *req = NULL;
586 int err;
587 struct dentry *root;
588
589 /* open dir */
590 dout("open_root_inode opening '%s'\n", path);
591 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
592 if (IS_ERR(req))
593 return ERR_PTR(PTR_ERR(req));
594 req->r_path1 = kstrdup(path, GFP_NOFS);
595 req->r_ino1.ino = CEPH_INO_ROOT;
596 req->r_ino1.snap = CEPH_NOSNAP;
597 req->r_started = started;
598 req->r_timeout = client->mount_args.mount_timeout * HZ;
599 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
600 req->r_num_caps = 2;
601 err = ceph_mdsc_do_request(mdsc, NULL, req);
602 if (err == 0) {
603 dout("open_root_inode success\n");
604 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
605 client->sb->s_root == NULL)
606 root = d_alloc_root(req->r_target_inode);
607 else
608 root = d_obtain_alias(req->r_target_inode);
609 req->r_target_inode = NULL;
610 dout("open_root_inode success, root dentry is %p\n", root);
611 } else {
612 root = ERR_PTR(err);
613 }
614 ceph_mdsc_put_request(req);
615 return root;
616}
617
618/*
619 * mount: join the ceph cluster, and open root directory.
620 */
621static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
622 const char *path)
623{
624 struct ceph_entity_addr *myaddr = NULL;
625 int err;
626 unsigned long timeout = client->mount_args.mount_timeout * HZ;
627 unsigned long started = jiffies; /* note the start time */
628 struct dentry *root;
629
630 dout("mount start\n");
631 mutex_lock(&client->mount_mutex);
632
633 /* initialize the messenger */
634 if (client->msgr == NULL) {
635 if (ceph_test_opt(client, MYIP))
636 myaddr = &client->mount_args.my_addr;
637 client->msgr = ceph_messenger_create(myaddr);
638 if (IS_ERR(client->msgr)) {
639 err = PTR_ERR(client->msgr);
640 client->msgr = NULL;
641 goto out;
642 }
643 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
644 }
645
646 /* send mount request, and wait for mon, mds, and osd maps */
647 err = ceph_monc_request_mount(&client->monc);
648 if (err < 0)
649 goto out;
650
651 while (!have_mon_map(client) && !client->mount_err) {
652 err = -EIO;
653 if (timeout && time_after_eq(jiffies, started + timeout))
654 goto out;
655
656 /* wait */
657 dout("mount waiting for mount\n");
658 err = wait_event_interruptible_timeout(client->mount_wq,
659 client->mount_err || have_mon_map(client),
660 timeout);
661 if (err == -EINTR || err == -ERESTARTSYS)
662 goto out;
663 if (client->mount_err) {
664 err = client->mount_err;
665 goto out;
666 }
667 }
668
669 dout("mount opening root\n");
670 root = open_root_dentry(client, "", started);
671 if (IS_ERR(root)) {
672 err = PTR_ERR(root);
673 goto out;
674 }
675 if (client->sb->s_root)
676 dput(root);
677 else
678 client->sb->s_root = root;
679
680 if (path[0] == 0) {
681 dget(root);
682 } else {
683 dout("mount opening base mountpoint\n");
684 root = open_root_dentry(client, path, started);
685 if (IS_ERR(root)) {
686 err = PTR_ERR(root);
687 dput(client->sb->s_root);
688 client->sb->s_root = NULL;
689 goto out;
690 }
691 }
692
693 mnt->mnt_root = root;
694 mnt->mnt_sb = client->sb;
695
696 client->mount_state = CEPH_MOUNT_MOUNTED;
697 dout("mount success\n");
698 err = 0;
699
700out:
701 mutex_unlock(&client->mount_mutex);
702 return err;
703}
704
705static int ceph_set_super(struct super_block *s, void *data)
706{
707 struct ceph_client *client = data;
708 int ret;
709
710 dout("set_super %p data %p\n", s, data);
711
712 s->s_flags = client->mount_args.sb_flags;
713 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
714
715 s->s_fs_info = client;
716 client->sb = s;
717
718 s->s_op = &ceph_super_ops;
719 s->s_export_op = &ceph_export_ops;
720
721 s->s_time_gran = 1000; /* 1000 ns == 1 us */
722
723 ret = set_anon_super(s, NULL); /* what is that second arg for? */
724 if (ret != 0)
725 goto fail;
726
727 return ret;
728
729fail:
730 s->s_fs_info = NULL;
731 client->sb = NULL;
732 return ret;
733}
734
735/*
736 * share superblock if same fs AND options
737 */
738static int ceph_compare_super(struct super_block *sb, void *data)
739{
740 struct ceph_client *new = data;
741 struct ceph_mount_args *args = &new->mount_args;
742 struct ceph_client *other = ceph_sb_to_client(sb);
743 int i;
744
745 dout("ceph_compare_super %p\n", sb);
746 if (args->flags & CEPH_OPT_FSID) {
747 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
748 dout("fsid doesn't match\n");
749 return 0;
750 }
751 } else {
752 /* do we share (a) monitor? */
753 for (i = 0; i < new->monc.monmap->num_mon; i++)
754 if (ceph_monmap_contains(other->monc.monmap,
755 &new->monc.monmap->mon_inst[i].addr))
756 break;
757 if (i == new->monc.monmap->num_mon) {
758 dout("mon ip not part of monmap\n");
759 return 0;
760 }
761 dout("mon ip matches existing sb %p\n", sb);
762 }
763 if (args->sb_flags != other->mount_args.sb_flags) {
764 dout("flags differ\n");
765 return 0;
766 }
767 return 1;
768}
769
770/*
771 * construct our own bdi so we can control readahead, etc.
772 */
773static int ceph_init_bdi(struct super_block *sb, struct ceph_client *client)
774{
775 int err;
776
777 err = bdi_init(&client->backing_dev_info);
778 if (err < 0)
779 return err;
780
781 /* set ra_pages based on rsize mount option? */
782 if (client->mount_args.rsize >= PAGE_CACHE_SIZE)
783 client->backing_dev_info.ra_pages =
784 (client->mount_args.rsize + PAGE_CACHE_SIZE - 1)
785 >> PAGE_SHIFT;
786
787 err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
788 return err;
789}
790
791static int ceph_get_sb(struct file_system_type *fs_type,
792 int flags, const char *dev_name, void *data,
793 struct vfsmount *mnt)
794{
795 struct super_block *sb;
796 struct ceph_client *client;
797 int err;
798 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
799 const char *path;
800
801 dout("ceph_get_sb\n");
802
803 /* create client (which we may/may not use) */
804 client = ceph_create_client();
805 if (IS_ERR(client))
806 return PTR_ERR(client);
807
808 err = parse_mount_args(client, flags, data, dev_name, &path);
809 if (err < 0)
810 goto out;
811
812 if (client->mount_args.flags & CEPH_OPT_NOSHARE)
813 compare_super = NULL;
814 sb = sget(fs_type, compare_super, ceph_set_super, client);
815 if (IS_ERR(sb)) {
816 err = PTR_ERR(sb);
817 goto out;
818 }
819
820 if (ceph_client(sb) != client) {
821 ceph_destroy_client(client);
822 client = ceph_client(sb);
823 dout("get_sb got existing client %p\n", client);
824 } else {
825 dout("get_sb using new client %p\n", client);
826
827 /* set up mempools */
828 err = -ENOMEM;
829 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
830 client->mount_args.wsize >> PAGE_CACHE_SHIFT);
831 if (!client->wb_pagevec_pool)
832 goto out_splat;
833
834 err = ceph_init_bdi(sb, client);
835 if (err < 0)
836 goto out_splat;
837 }
838
839 err = ceph_mount(client, mnt, path);
840 if (err < 0)
841 goto out_splat;
842 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
843 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
844 return 0;
845
846out_splat:
847 ceph_mdsc_close_sessions(&client->mdsc);
848 up_write(&sb->s_umount);
849 deactivate_super(sb);
850 goto out_final;
851
852out:
853 ceph_destroy_client(client);
854out_final:
855 dout("ceph_get_sb fail %d\n", err);
856 return err;
857}
858
859static void ceph_kill_sb(struct super_block *s)
860{
861 struct ceph_client *client = ceph_sb_to_client(s);
862 dout("kill_sb %p\n", s);
863 ceph_mdsc_pre_umount(&client->mdsc);
864 bdi_unregister(&client->backing_dev_info);
865 kill_anon_super(s); /* will call put_super after sb is r/o */
866 bdi_destroy(&client->backing_dev_info);
867 ceph_destroy_client(client);
868}
869
870static struct file_system_type ceph_fs_type = {
871 .owner = THIS_MODULE,
872 .name = "ceph",
873 .get_sb = ceph_get_sb,
874 .kill_sb = ceph_kill_sb,
875 .fs_flags = FS_RENAME_DOES_D_MOVE,
876};
877
878#define _STRINGIFY(x) #x
879#define STRINGIFY(x) _STRINGIFY(x)
880
881static int __init init_ceph(void)
882{
883 int ret = 0;
884
885 ret = ceph_debugfs_init();
886 if (ret < 0)
887 goto out;
888
889 ret = ceph_msgr_init();
890 if (ret < 0)
891 goto out_debugfs;
892
893 ret = init_caches();
894 if (ret)
895 goto out_msgr;
896
897 ceph_caps_init();
898
899 ret = register_filesystem(&ceph_fs_type);
900 if (ret)
901 goto out_icache;
902
Sage Weilfa0b72e2009-10-07 10:59:10 -0700903 pr_info("loaded %d.%d.%d (mon/mds/osd proto %d/%d/%d)\n",
904 CEPH_VERSION_MAJOR, CEPH_VERSION_MINOR, CEPH_VERSION_PATCH,
905 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL);
Sage Weil16725b92009-10-06 11:31:07 -0700906 return 0;
907
908out_icache:
909 destroy_caches();
910out_msgr:
911 ceph_msgr_exit();
912out_debugfs:
913 ceph_debugfs_cleanup();
914out:
915 return ret;
916}
917
918static void __exit exit_ceph(void)
919{
920 dout("exit_ceph\n");
921 unregister_filesystem(&ceph_fs_type);
922 ceph_caps_finalize();
923 destroy_caches();
924 ceph_msgr_exit();
925 ceph_debugfs_cleanup();
926}
927
928module_init(init_ceph);
929module_exit(exit_ceph);
930
931MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
932MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
933MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
934MODULE_DESCRIPTION("Ceph filesystem for Linux");
935MODULE_LICENSE("GPL");