projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ceph: super.c
[deliverable/linux.git] / fs / ceph / super.c
CommitLineData
16725b9d
SW		 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
19#include "ceph_ver.h"
20#include "decode.h"
21#include "super.h"
22#include "mon_client.h"
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);
101 return 0;
102}
103
104
105/**
106 * ceph_show_options - Show mount options in /proc/mounts
107 * @m: seq_file to write to
108 * @mnt: mount descriptor
109 */
110static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
111{
112 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
113 struct ceph_mount_args *args = &client->mount_args;
114
115 if (args->flags & CEPH_OPT_FSID)
116 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
117 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
118 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
119 if (args->flags & CEPH_OPT_NOSHARE)
120 seq_puts(m, ",noshare");
121 if (args->flags & CEPH_OPT_DIRSTAT)
122 seq_puts(m, ",dirstat");
123 if ((args->flags & CEPH_OPT_RBYTES) == 0)
124 seq_puts(m, ",norbytes");
125 if (args->flags & CEPH_OPT_NOCRC)
126 seq_puts(m, ",nocrc");
127 if (args->flags & CEPH_OPT_NOASYNCREADDIR)
128 seq_puts(m, ",noasyncreaddir");
129 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
130 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
131 if (args->secret)
132 seq_puts(m, ",secret=<hidden>");
133 return 0;
134}
135
136/*
137 * caches
138 */
139struct kmem_cache *ceph_inode_cachep;
140struct kmem_cache *ceph_cap_cachep;
141struct kmem_cache *ceph_dentry_cachep;
142struct kmem_cache *ceph_file_cachep;
143
144static void ceph_inode_init_once(void *foo)
145{
146 struct ceph_inode_info *ci = foo;
147 inode_init_once(&ci->vfs_inode);
148}
149
150static int __init init_caches(void)
151{
152 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
153 sizeof(struct ceph_inode_info),
154 __alignof__(struct ceph_inode_info),
155 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
156 ceph_inode_init_once);
157 if (ceph_inode_cachep == NULL)
158 return -ENOMEM;
159
160 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
161 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
162 if (ceph_cap_cachep == NULL)
163 goto bad_cap;
164
165 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
166 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
167 if (ceph_dentry_cachep == NULL)
168 goto bad_dentry;
169
170 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
171 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
172 if (ceph_file_cachep == NULL)
173 goto bad_file;
174
175 return 0;
176
177bad_file:
178 kmem_cache_destroy(ceph_dentry_cachep);
179bad_dentry:
180 kmem_cache_destroy(ceph_cap_cachep);
181bad_cap:
182 kmem_cache_destroy(ceph_inode_cachep);
183 return -ENOMEM;
184}
185
186static void destroy_caches(void)
187{
188 kmem_cache_destroy(ceph_inode_cachep);
189 kmem_cache_destroy(ceph_cap_cachep);
190 kmem_cache_destroy(ceph_dentry_cachep);
191 kmem_cache_destroy(ceph_file_cachep);
192}
193
194
195/*
196 * ceph_umount_begin - initiate forced umount. Tear down down the
197 * mount, skipping steps that may hang while waiting for server(s).
198 */
199static void ceph_umount_begin(struct super_block *sb)
200{
201 struct ceph_client *client = ceph_sb_to_client(sb);
202
203 dout("ceph_umount_begin - starting forced umount\n");
204 if (!client)
205 return;
206 client->mount_state = CEPH_MOUNT_SHUTDOWN;
207 return;
208}
209
210static const struct super_operations ceph_super_ops = {
211 .alloc_inode = ceph_alloc_inode,
212 .destroy_inode = ceph_destroy_inode,
213 .write_inode = ceph_write_inode,
214 .sync_fs = ceph_syncfs,
215 .put_super = ceph_put_super,
216 .show_options = ceph_show_options,
217 .statfs = ceph_statfs,
218 .umount_begin = ceph_umount_begin,
219};
220
221
222const char *ceph_msg_type_name(int type)
223{
224 switch (type) {
225 case CEPH_MSG_SHUTDOWN: return "shutdown";
226 case CEPH_MSG_PING: return "ping";
227 case CEPH_MSG_MON_MAP: return "mon_map";
228 case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
229 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
230 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
231 case CEPH_MSG_CLIENT_MOUNT: return "client_mount";
232 case CEPH_MSG_CLIENT_MOUNT_ACK: return "client_mount_ack";
233 case CEPH_MSG_STATFS: return "statfs";
234 case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
235 case CEPH_MSG_MDS_GETMAP: return "mds_getmap";
236 case CEPH_MSG_MDS_MAP: return "mds_map";
237 case CEPH_MSG_CLIENT_SESSION: return "client_session";
238 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
239 case CEPH_MSG_CLIENT_REQUEST: return "client_request";
240 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
241 case CEPH_MSG_CLIENT_REPLY: return "client_reply";
242 case CEPH_MSG_CLIENT_CAPS: return "client_caps";
243 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
244 case CEPH_MSG_CLIENT_SNAP: return "client_snap";
245 case CEPH_MSG_CLIENT_LEASE: return "client_lease";
246 case CEPH_MSG_OSD_GETMAP: return "osd_getmap";
247 case CEPH_MSG_OSD_MAP: return "osd_map";
248 case CEPH_MSG_OSD_OP: return "osd_op";
249 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
250 default: return "unknown";
251 }
252}
253
254
255/*
256 * mount options
257 */
258enum {
259 Opt_fsidmajor,
260 Opt_fsidminor,
261 Opt_monport,
262 Opt_wsize,
263 Opt_rsize,
264 Opt_osdtimeout,
265 Opt_mount_timeout,
266 Opt_caps_wanted_delay_min,
267 Opt_caps_wanted_delay_max,
268 Opt_readdir_max_entries,
269 /* int args above */
270 Opt_snapdirname,
271 Opt_secret,
272 /* string args above */
273 Opt_ip,
274 Opt_noshare,
275 Opt_dirstat,
276 Opt_nodirstat,
277 Opt_rbytes,
278 Opt_norbytes,
279 Opt_nocrc,
280 Opt_noasyncreaddir,
281};
282
283static match_table_t arg_tokens = {
284 {Opt_fsidmajor, "fsidmajor=%ld"},
285 {Opt_fsidminor, "fsidminor=%ld"},
286 {Opt_monport, "monport=%d"},
287 {Opt_wsize, "wsize=%d"},
288 {Opt_rsize, "rsize=%d"},
289 {Opt_osdtimeout, "osdtimeout=%d"},
290 {Opt_mount_timeout, "mount_timeout=%d"},
291 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
292 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
293 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
294 /* int args above */
295 {Opt_snapdirname, "snapdirname=%s"},
296 {Opt_secret, "secret=%s"},
297 /* string args above */
298 {Opt_ip, "ip=%s"},
299 {Opt_noshare, "noshare"},
300 {Opt_dirstat, "dirstat"},
301 {Opt_nodirstat, "nodirstat"},
302 {Opt_rbytes, "rbytes"},
303 {Opt_norbytes, "norbytes"},
304 {Opt_nocrc, "nocrc"},
305 {Opt_noasyncreaddir, "noasyncreaddir"},
306 {-1, NULL}
307};
308
309
310static int parse_mount_args(struct ceph_client *client,
311 int flags, char *options, const char *dev_name,
312 const char **path)
313{
314 struct ceph_mount_args *args = &client->mount_args;
315 const char *c;
316 int err;
317 substring_t argstr[MAX_OPT_ARGS];
318 int num_mon;
319 struct ceph_entity_addr mon_addr[CEPH_MAX_MON_MOUNT_ADDR];
320 int i;
321
322 dout("parse_mount_args dev_name '%s'\n", dev_name);
323 memset(args, 0, sizeof(*args));
324
325 /* start with defaults */
326 args->sb_flags = flags;
327 args->flags = CEPH_OPT_DEFAULT;
328 args->osd_timeout = 5; /* seconds */
329 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
330 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
331 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
332 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
333 args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
334 args->max_readdir = 1024;
335
336 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
337 if (!dev_name)
338 return -EINVAL;
339 *path = strstr(dev_name, ":/");
340 if (*path == NULL) {
341 pr_err("device name is missing path (no :/ in %s)\n",
342 dev_name);
343 return -EINVAL;
344 }
345
346 /* get mon ip(s) */
347 err = ceph_parse_ips(dev_name, *path, mon_addr,
348 CEPH_MAX_MON_MOUNT_ADDR, &num_mon);
349 if (err < 0)
350 return err;
351
352 /* build initial monmap */
353 client->monc.monmap = kzalloc(sizeof(*client->monc.monmap) +
354 num_mon*sizeof(client->monc.monmap->mon_inst[0]),
355 GFP_KERNEL);
356 if (!client->monc.monmap)
357 return -ENOMEM;
358 for (i = 0; i < num_mon; i++) {
359 client->monc.monmap->mon_inst[i].addr = mon_addr[i];
360 client->monc.monmap->mon_inst[i].addr.erank = 0;
361 client->monc.monmap->mon_inst[i].addr.nonce = 0;
362 client->monc.monmap->mon_inst[i].name.type =
363 CEPH_ENTITY_TYPE_MON;
364 client->monc.monmap->mon_inst[i].name.num = cpu_to_le64(i);
365 }
366 client->monc.monmap->num_mon = num_mon;
367 memset(&args->my_addr.in_addr, 0, sizeof(args->my_addr.in_addr));
368
369 /* path on server */
370 *path += 2;
371 dout("server path '%s'\n", *path);
372
373 /* parse mount options */
374 while ((c = strsep(&options, ",")) != NULL) {
375 int token, intval, ret;
376 if (!*c)
377 continue;
378 token = match_token((char *)c, arg_tokens, argstr);
379 if (token < 0) {
380 pr_err("bad mount option at '%s'\n", c);
381 return -EINVAL;
382
383 }
384 if (token < Opt_ip) {
385 ret = match_int(&argstr[0], &intval);
386 if (ret < 0) {
387 pr_err("bad mount option arg (not int) "
388 "at '%s'\n", c);
389 continue;
390 }
391 dout("got token %d intval %d\n", token, intval);
392 }
393 switch (token) {
394 case Opt_fsidmajor:
395 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
396 break;
397 case Opt_fsidminor:
398 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
399 break;
400 case Opt_ip:
401 err = ceph_parse_ips(argstr[0].from,
402 argstr[0].to,
403 &args->my_addr,
404 1, NULL);
405 if (err < 0)
406 return err;
407 args->flags |= CEPH_OPT_MYIP;
408 break;
409
410 case Opt_snapdirname:
411 kfree(args->snapdir_name);
412 args->snapdir_name = kstrndup(argstr[0].from,
413 argstr[0].to-argstr[0].from,
414 GFP_KERNEL);
415 break;
416 case Opt_secret:
417 args->secret = kstrndup(argstr[0].from,
418 argstr[0].to-argstr[0].from,
419 GFP_KERNEL);
420 break;
421
422 /* misc */
423 case Opt_wsize:
424 args->wsize = intval;
425 break;
426 case Opt_rsize:
427 args->rsize = intval;
428 break;
429 case Opt_osdtimeout:
430 args->osd_timeout = intval;
431 break;
432 case Opt_mount_timeout:
433 args->mount_timeout = intval;
434 break;
435 case Opt_caps_wanted_delay_min:
436 args->caps_wanted_delay_min = intval;
437 break;
438 case Opt_caps_wanted_delay_max:
439 args->caps_wanted_delay_max = intval;
440 break;
441 case Opt_readdir_max_entries:
442 args->max_readdir = intval;
443 break;
444
445 case Opt_noshare:
446 args->flags |= CEPH_OPT_NOSHARE;
447 break;
448
449 case Opt_dirstat:
450 args->flags |= CEPH_OPT_DIRSTAT;
451 break;
452 case Opt_nodirstat:
453 args->flags &= ~CEPH_OPT_DIRSTAT;
454 break;
455 case Opt_rbytes:
456 args->flags |= CEPH_OPT_RBYTES;
457 break;
458 case Opt_norbytes:
459 args->flags &= ~CEPH_OPT_RBYTES;
460 break;
461 case Opt_nocrc:
462 args->flags |= CEPH_OPT_NOCRC;
463 break;
464 case Opt_noasyncreaddir:
465 args->flags |= CEPH_OPT_NOASYNCREADDIR;
466 break;
467
468 default:
469 BUG_ON(token);
470 }
471 }
472
473 return 0;
474}
475
476static void release_mount_args(struct ceph_mount_args *args)
477{
478 kfree(args->snapdir_name);
479 args->snapdir_name = NULL;
480 kfree(args->secret);
481 args->secret = NULL;
482}
483
484/*
485 * create a fresh client instance
486 */
487static struct ceph_client *ceph_create_client(void)
488{
489 struct ceph_client *client;
490 int err = -ENOMEM;
491
492 client = kzalloc(sizeof(*client), GFP_KERNEL);
493 if (client == NULL)
494 return ERR_PTR(-ENOMEM);
495
496 mutex_init(&client->mount_mutex);
497
498 init_waitqueue_head(&client->mount_wq);
499
500 client->sb = NULL;
501 client->mount_state = CEPH_MOUNT_MOUNTING;
502 client->whoami = -1;
503
504 client->msgr = NULL;
505
506 client->mount_err = 0;
507 client->signed_ticket = NULL;
508 client->signed_ticket_len = 0;
509
510 err = -ENOMEM;
511 client->wb_wq = create_workqueue("ceph-writeback");
512 if (client->wb_wq == NULL)
513 goto fail;
514 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
515 if (client->pg_inv_wq == NULL)
516 goto fail_wb_wq;
517 client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
518 if (client->trunc_wq == NULL)
519 goto fail_pg_inv_wq;
520
521 /* subsystems */
522 err = ceph_monc_init(&client->monc, client);
523 if (err < 0)
524 goto fail_trunc_wq;
525 err = ceph_osdc_init(&client->osdc, client);
526 if (err < 0)
527 goto fail_monc;
528 ceph_mdsc_init(&client->mdsc, client);
529 return client;
530
531fail_monc:
532 ceph_monc_stop(&client->monc);
533fail_trunc_wq:
534 destroy_workqueue(client->trunc_wq);
535fail_pg_inv_wq:
536 destroy_workqueue(client->pg_inv_wq);
537fail_wb_wq:
538 destroy_workqueue(client->wb_wq);
539fail:
540 kfree(client);
541 return ERR_PTR(err);
542}
543
544static void ceph_destroy_client(struct ceph_client *client)
545{
546 dout("destroy_client %p\n", client);
547
548 /* unmount */
549 ceph_mdsc_stop(&client->mdsc);
550 ceph_monc_stop(&client->monc);
551 ceph_osdc_stop(&client->osdc);
552
553 kfree(client->signed_ticket);
554
555 ceph_debugfs_client_cleanup(client);
556 destroy_workqueue(client->wb_wq);
557 destroy_workqueue(client->pg_inv_wq);
558 destroy_workqueue(client->trunc_wq);
559
560 if (client->msgr)
561 ceph_messenger_destroy(client->msgr);
562 if (client->wb_pagevec_pool)
563 mempool_destroy(client->wb_pagevec_pool);
564
565 release_mount_args(&client->mount_args);
566
567 kfree(client);
568 dout("destroy_client %p done\n", client);
569}
570
571/*
572 * true if we have the mon map (and have thus joined the cluster)
573 */
574static int have_mon_map(struct ceph_client *client)
575{
576 return client->monc.monmap && client->monc.monmap->epoch;
577}
578
579/*
580 * Bootstrap mount by opening the root directory. Note the mount
581 * @started time from caller, and time out if this takes too long.
582 */
583static struct dentry *open_root_dentry(struct ceph_client *client,
584 const char *path,
585 unsigned long started)
586{
587 struct ceph_mds_client *mdsc = &client->mdsc;
588 struct ceph_mds_request *req = NULL;
589 int err;
590 struct dentry *root;
591
592 /* open dir */
593 dout("open_root_inode opening '%s'\n", path);
594 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
595 if (IS_ERR(req))
596 return ERR_PTR(PTR_ERR(req));
597 req->r_path1 = kstrdup(path, GFP_NOFS);
598 req->r_ino1.ino = CEPH_INO_ROOT;
599 req->r_ino1.snap = CEPH_NOSNAP;
600 req->r_started = started;
601 req->r_timeout = client->mount_args.mount_timeout * HZ;
602 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
603 req->r_num_caps = 2;
604 err = ceph_mdsc_do_request(mdsc, NULL, req);
605 if (err == 0) {
606 dout("open_root_inode success\n");
607 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
608 client->sb->s_root == NULL)
609 root = d_alloc_root(req->r_target_inode);
610 else
611 root = d_obtain_alias(req->r_target_inode);
612 req->r_target_inode = NULL;
613 dout("open_root_inode success, root dentry is %p\n", root);
614 } else {
615 root = ERR_PTR(err);
616 }
617 ceph_mdsc_put_request(req);
618 return root;
619}
620
621/*
622 * mount: join the ceph cluster, and open root directory.
623 */
624static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
625 const char *path)
626{
627 struct ceph_entity_addr *myaddr = NULL;
628 int err;
629 unsigned long timeout = client->mount_args.mount_timeout * HZ;
630 unsigned long started = jiffies; /* note the start time */
631 struct dentry *root;
632
633 dout("mount start\n");
634 mutex_lock(&client->mount_mutex);
635
636 /* initialize the messenger */
637 if (client->msgr == NULL) {
638 if (ceph_test_opt(client, MYIP))
639 myaddr = &client->mount_args.my_addr;
640 client->msgr = ceph_messenger_create(myaddr);
641 if (IS_ERR(client->msgr)) {
642 err = PTR_ERR(client->msgr);
643 client->msgr = NULL;
644 goto out;
645 }
646 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
647 }
648
649 /* send mount request, and wait for mon, mds, and osd maps */
650 err = ceph_monc_request_mount(&client->monc);
651 if (err < 0)
652 goto out;
653
654 while (!have_mon_map(client) && !client->mount_err) {
655 err = -EIO;
656 if (timeout && time_after_eq(jiffies, started + timeout))
657 goto out;
658
659 /* wait */
660 dout("mount waiting for mount\n");
661 err = wait_event_interruptible_timeout(client->mount_wq,
662 client->mount_err || have_mon_map(client),
663 timeout);
664 if (err == -EINTR || err == -ERESTARTSYS)
665 goto out;
666 if (client->mount_err) {
667 err = client->mount_err;
668 goto out;
669 }
670 }
671
672 dout("mount opening root\n");
673 root = open_root_dentry(client, "", started);
674 if (IS_ERR(root)) {
675 err = PTR_ERR(root);
676 goto out;
677 }
678 if (client->sb->s_root)
679 dput(root);
680 else
681 client->sb->s_root = root;
682
683 if (path[0] == 0) {
684 dget(root);
685 } else {
686 dout("mount opening base mountpoint\n");
687 root = open_root_dentry(client, path, started);
688 if (IS_ERR(root)) {
689 err = PTR_ERR(root);
690 dput(client->sb->s_root);
691 client->sb->s_root = NULL;
692 goto out;
693 }
694 }
695
696 mnt->mnt_root = root;
697 mnt->mnt_sb = client->sb;
698
699 client->mount_state = CEPH_MOUNT_MOUNTED;
700 dout("mount success\n");
701 err = 0;
702
703out:
704 mutex_unlock(&client->mount_mutex);
705 return err;
706}
707
708static int ceph_set_super(struct super_block *s, void *data)
709{
710 struct ceph_client *client = data;
711 int ret;
712
713 dout("set_super %p data %p\n", s, data);
714
715 s->s_flags = client->mount_args.sb_flags;
716 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
717
718 s->s_fs_info = client;
719 client->sb = s;
720
721 s->s_op = &ceph_super_ops;
722 s->s_export_op = &ceph_export_ops;
723
724 s->s_time_gran = 1000; /* 1000 ns == 1 us */
725
726 ret = set_anon_super(s, NULL); /* what is that second arg for? */
727 if (ret != 0)
728 goto fail;
729
730 return ret;
731
732fail:
733 s->s_fs_info = NULL;
734 client->sb = NULL;
735 return ret;
736}
737
738/*
739 * share superblock if same fs AND options
740 */
741static int ceph_compare_super(struct super_block *sb, void *data)
742{
743 struct ceph_client *new = data;
744 struct ceph_mount_args *args = &new->mount_args;
745 struct ceph_client *other = ceph_sb_to_client(sb);
746 int i;
747
748 dout("ceph_compare_super %p\n", sb);
749 if (args->flags & CEPH_OPT_FSID) {
750 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
751 dout("fsid doesn't match\n");
752 return 0;
753 }
754 } else {
755 /* do we share (a) monitor? */
756 for (i = 0; i < new->monc.monmap->num_mon; i++)
757 if (ceph_monmap_contains(other->monc.monmap,
758 &new->monc.monmap->mon_inst[i].addr))
759 break;
760 if (i == new->monc.monmap->num_mon) {
761 dout("mon ip not part of monmap\n");
762 return 0;
763 }
764 dout("mon ip matches existing sb %p\n", sb);
765 }
766 if (args->sb_flags != other->mount_args.sb_flags) {
767 dout("flags differ\n");
768 return 0;
769 }
770 return 1;
771}
772
773/*
774 * construct our own bdi so we can control readahead, etc.
775 */
776static int ceph_init_bdi(struct super_block *sb, struct ceph_client *client)
777{
778 int err;
779
780 err = bdi_init(&client->backing_dev_info);
781 if (err < 0)
782 return err;
783
784 /* set ra_pages based on rsize mount option? */
785 if (client->mount_args.rsize >= PAGE_CACHE_SIZE)
786 client->backing_dev_info.ra_pages =
787 (client->mount_args.rsize + PAGE_CACHE_SIZE - 1)
788 >> PAGE_SHIFT;
789
790 err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
791 return err;
792}
793
794static int ceph_get_sb(struct file_system_type *fs_type,
795 int flags, const char *dev_name, void *data,
796 struct vfsmount *mnt)
797{
798 struct super_block *sb;
799 struct ceph_client *client;
800 int err;
801 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
802 const char *path;
803
804 dout("ceph_get_sb\n");
805
806 /* create client (which we may/may not use) */
807 client = ceph_create_client();
808 if (IS_ERR(client))
809 return PTR_ERR(client);
810
811 err = parse_mount_args(client, flags, data, dev_name, &path);
812 if (err < 0)
813 goto out;
814
815 if (client->mount_args.flags & CEPH_OPT_NOSHARE)
816 compare_super = NULL;
817 sb = sget(fs_type, compare_super, ceph_set_super, client);
818 if (IS_ERR(sb)) {
819 err = PTR_ERR(sb);
820 goto out;
821 }
822
823 if (ceph_client(sb) != client) {
824 ceph_destroy_client(client);
825 client = ceph_client(sb);
826 dout("get_sb got existing client %p\n", client);
827 } else {
828 dout("get_sb using new client %p\n", client);
829
830 /* set up mempools */
831 err = -ENOMEM;
832 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
833 client->mount_args.wsize >> PAGE_CACHE_SHIFT);
834 if (!client->wb_pagevec_pool)
835 goto out_splat;
836
837 err = ceph_init_bdi(sb, client);
838 if (err < 0)
839 goto out_splat;
840 }
841
842 err = ceph_mount(client, mnt, path);
843 if (err < 0)
844 goto out_splat;
845 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
846 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
847 return 0;
848
849out_splat:
850 ceph_mdsc_close_sessions(&client->mdsc);
851 up_write(&sb->s_umount);
852 deactivate_super(sb);
853 goto out_final;
854
855out:
856 ceph_destroy_client(client);
857out_final:
858 dout("ceph_get_sb fail %d\n", err);
859 return err;
860}
861
862static void ceph_kill_sb(struct super_block *s)
863{
864 struct ceph_client *client = ceph_sb_to_client(s);
865 dout("kill_sb %p\n", s);
866 ceph_mdsc_pre_umount(&client->mdsc);
867 bdi_unregister(&client->backing_dev_info);
868 kill_anon_super(s); /* will call put_super after sb is r/o */
869 bdi_destroy(&client->backing_dev_info);
870 ceph_destroy_client(client);
871}
872
873static struct file_system_type ceph_fs_type = {
874 .owner = THIS_MODULE,
875 .name = "ceph",
876 .get_sb = ceph_get_sb,
877 .kill_sb = ceph_kill_sb,
878 .fs_flags = FS_RENAME_DOES_D_MOVE,
879};
880
881#define _STRINGIFY(x) #x
882#define STRINGIFY(x) _STRINGIFY(x)
883
884static int __init init_ceph(void)
885{
886 int ret = 0;
887
888 ret = ceph_debugfs_init();
889 if (ret < 0)
890 goto out;
891
892 ret = ceph_msgr_init();
893 if (ret < 0)
894 goto out_debugfs;
895
896 ret = init_caches();
897 if (ret)
898 goto out_msgr;
899
900 ceph_caps_init();
901
902 ret = register_filesystem(&ceph_fs_type);
903 if (ret)
904 goto out_icache;
905
906 pr_info("loaded (%s)\n", STRINGIFY(CEPH_GIT_VER));
907 return 0;
908
909out_icache:
910 destroy_caches();
911out_msgr:
912 ceph_msgr_exit();
913out_debugfs:
914 ceph_debugfs_cleanup();
915out:
916 return ret;
917}
918
919static void __exit exit_ceph(void)
920{
921 dout("exit_ceph\n");
922 unregister_filesystem(&ceph_fs_type);
923 ceph_caps_finalize();
924 destroy_caches();
925 ceph_msgr_exit();
926 ceph_debugfs_cleanup();
927}
928
929module_init(init_ceph);
930module_exit(exit_ceph);
931
932MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
933MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
934MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
935MODULE_DESCRIPTION("Ceph filesystem for Linux");
936MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.06001 seconds and 5 git commands to generate.