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ceph: move directory size logic to ceph_getattr
[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
16725b9d
SW		 19#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);
f2cf418c 100 dout("sync_fs %d done\n", wait);
16725b9d
SW		 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";
16725b9d
SW		 235 case CEPH_MSG_MDS_MAP: return "mds_map";
236 case CEPH_MSG_CLIENT_SESSION: return "client_session";
237 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
238 case CEPH_MSG_CLIENT_REQUEST: return "client_request";
239 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
240 case CEPH_MSG_CLIENT_REPLY: return "client_reply";
241 case CEPH_MSG_CLIENT_CAPS: return "client_caps";
242 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
243 case CEPH_MSG_CLIENT_SNAP: return "client_snap";
244 case CEPH_MSG_CLIENT_LEASE: return "client_lease";
16725b9d
SW		 245 case CEPH_MSG_OSD_MAP: return "osd_map";
246 case CEPH_MSG_OSD_OP: return "osd_op";
247 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
248 default: return "unknown";
249 }
250}
251
252
253/*
254 * mount options
255 */
256enum {
257 Opt_fsidmajor,
258 Opt_fsidminor,
259 Opt_monport,
260 Opt_wsize,
261 Opt_rsize,
262 Opt_osdtimeout,
263 Opt_mount_timeout,
264 Opt_caps_wanted_delay_min,
265 Opt_caps_wanted_delay_max,
266 Opt_readdir_max_entries,
267 /* int args above */
268 Opt_snapdirname,
269 Opt_secret,
270 /* string args above */
271 Opt_ip,
272 Opt_noshare,
273 Opt_dirstat,
274 Opt_nodirstat,
275 Opt_rbytes,
276 Opt_norbytes,
277 Opt_nocrc,
278 Opt_noasyncreaddir,
279};
280
281static match_table_t arg_tokens = {
282 {Opt_fsidmajor, "fsidmajor=%ld"},
283 {Opt_fsidminor, "fsidminor=%ld"},
284 {Opt_monport, "monport=%d"},
285 {Opt_wsize, "wsize=%d"},
286 {Opt_rsize, "rsize=%d"},
287 {Opt_osdtimeout, "osdtimeout=%d"},
288 {Opt_mount_timeout, "mount_timeout=%d"},
289 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
290 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
291 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
292 /* int args above */
293 {Opt_snapdirname, "snapdirname=%s"},
294 {Opt_secret, "secret=%s"},
295 /* string args above */
296 {Opt_ip, "ip=%s"},
297 {Opt_noshare, "noshare"},
298 {Opt_dirstat, "dirstat"},
299 {Opt_nodirstat, "nodirstat"},
300 {Opt_rbytes, "rbytes"},
301 {Opt_norbytes, "norbytes"},
302 {Opt_nocrc, "nocrc"},
303 {Opt_noasyncreaddir, "noasyncreaddir"},
304 {-1, NULL}
305};
306
307
308static int parse_mount_args(struct ceph_client *client,
309 int flags, char *options, const char *dev_name,
310 const char **path)
311{
312 struct ceph_mount_args *args = &client->mount_args;
313 const char *c;
314 int err;
315 substring_t argstr[MAX_OPT_ARGS];
316 int num_mon;
317 struct ceph_entity_addr mon_addr[CEPH_MAX_MON_MOUNT_ADDR];
318 int i;
319
320 dout("parse_mount_args dev_name '%s'\n", dev_name);
321 memset(args, 0, sizeof(*args));
322
323 /* start with defaults */
324 args->sb_flags = flags;
325 args->flags = CEPH_OPT_DEFAULT;
326 args->osd_timeout = 5; /* seconds */
327 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
328 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
329 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
8fa97655 330 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
16725b9d
SW		 331 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
332 args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
333 args->max_readdir = 1024;
334
335 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
336 if (!dev_name)
337 return -EINVAL;
338 *path = strstr(dev_name, ":/");
339 if (*path == NULL) {
340 pr_err("device name is missing path (no :/ in %s)\n",
341 dev_name);
342 return -EINVAL;
343 }
344
345 /* get mon ip(s) */
346 err = ceph_parse_ips(dev_name, *path, mon_addr,
347 CEPH_MAX_MON_MOUNT_ADDR, &num_mon);
348 if (err < 0)
349 return err;
350
351 /* build initial monmap */
352 client->monc.monmap = kzalloc(sizeof(*client->monc.monmap) +
353 num_mon*sizeof(client->monc.monmap->mon_inst[0]),
354 GFP_KERNEL);
355 if (!client->monc.monmap)
356 return -ENOMEM;
357 for (i = 0; i < num_mon; i++) {
358 client->monc.monmap->mon_inst[i].addr = mon_addr[i];
359 client->monc.monmap->mon_inst[i].addr.erank = 0;
360 client->monc.monmap->mon_inst[i].addr.nonce = 0;
361 client->monc.monmap->mon_inst[i].name.type =
362 CEPH_ENTITY_TYPE_MON;
363 client->monc.monmap->mon_inst[i].name.num = cpu_to_le64(i);
364 }
365 client->monc.monmap->num_mon = num_mon;
366 memset(&args->my_addr.in_addr, 0, sizeof(args->my_addr.in_addr));
367
368 /* path on server */
369 *path += 2;
370 dout("server path '%s'\n", *path);
371
372 /* parse mount options */
373 while ((c = strsep(&options, ",")) != NULL) {
374 int token, intval, ret;
375 if (!*c)
376 continue;
377 token = match_token((char *)c, arg_tokens, argstr);
378 if (token < 0) {
379 pr_err("bad mount option at '%s'\n", c);
380 return -EINVAL;
381
382 }
383 if (token < Opt_ip) {
384 ret = match_int(&argstr[0], &intval);
385 if (ret < 0) {
386 pr_err("bad mount option arg (not int) "
387 "at '%s'\n", c);
388 continue;
389 }
390 dout("got token %d intval %d\n", token, intval);
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)
405 return err;
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;
415 case Opt_secret:
416 args->secret = kstrndup(argstr[0].from,
417 argstr[0].to-argstr[0].from,
418 GFP_KERNEL);
419 break;
420
421 /* misc */
422 case Opt_wsize:
423 args->wsize = intval;
424 break;
425 case Opt_rsize:
426 args->rsize = intval;
427 break;
428 case Opt_osdtimeout:
429 args->osd_timeout = intval;
430 break;
431 case Opt_mount_timeout:
432 args->mount_timeout = intval;
433 break;
434 case Opt_caps_wanted_delay_min:
435 args->caps_wanted_delay_min = intval;
436 break;
437 case Opt_caps_wanted_delay_max:
438 args->caps_wanted_delay_max = intval;
439 break;
440 case Opt_readdir_max_entries:
441 args->max_readdir = intval;
442 break;
443
444 case Opt_noshare:
445 args->flags |= CEPH_OPT_NOSHARE;
446 break;
447
448 case Opt_dirstat:
449 args->flags |= CEPH_OPT_DIRSTAT;
450 break;
451 case Opt_nodirstat:
452 args->flags &= ~CEPH_OPT_DIRSTAT;
453 break;
454 case Opt_rbytes:
455 args->flags |= CEPH_OPT_RBYTES;
456 break;
457 case Opt_norbytes:
458 args->flags &= ~CEPH_OPT_RBYTES;
459 break;
460 case Opt_nocrc:
461 args->flags |= CEPH_OPT_NOCRC;
462 break;
463 case Opt_noasyncreaddir:
464 args->flags |= CEPH_OPT_NOASYNCREADDIR;
465 break;
466
467 default:
468 BUG_ON(token);
469 }
470 }
471
472 return 0;
473}
474
475static void release_mount_args(struct ceph_mount_args *args)
476{
477 kfree(args->snapdir_name);
478 args->snapdir_name = NULL;
479 kfree(args->secret);
480 args->secret = NULL;
481}
482
483/*
484 * create a fresh client instance
485 */
486static struct ceph_client *ceph_create_client(void)
487{
488 struct ceph_client *client;
489 int err = -ENOMEM;
490
491 client = kzalloc(sizeof(*client), GFP_KERNEL);
492 if (client == NULL)
493 return ERR_PTR(-ENOMEM);
494
495 mutex_init(&client->mount_mutex);
496
497 init_waitqueue_head(&client->mount_wq);
498
499 client->sb = NULL;
500 client->mount_state = CEPH_MOUNT_MOUNTING;
501 client->whoami = -1;
502
503 client->msgr = NULL;
504
505 client->mount_err = 0;
506 client->signed_ticket = NULL;
507 client->signed_ticket_len = 0;
508
509 err = -ENOMEM;
510 client->wb_wq = create_workqueue("ceph-writeback");
511 if (client->wb_wq == NULL)
512 goto fail;
513 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
514 if (client->pg_inv_wq == NULL)
515 goto fail_wb_wq;
516 client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
517 if (client->trunc_wq == NULL)
518 goto fail_pg_inv_wq;
519
520 /* subsystems */
521 err = ceph_monc_init(&client->monc, client);
522 if (err < 0)
523 goto fail_trunc_wq;
524 err = ceph_osdc_init(&client->osdc, client);
525 if (err < 0)
526 goto fail_monc;
527 ceph_mdsc_init(&client->mdsc, client);
528 return client;
529
530fail_monc:
531 ceph_monc_stop(&client->monc);
532fail_trunc_wq:
533 destroy_workqueue(client->trunc_wq);
534fail_pg_inv_wq:
535 destroy_workqueue(client->pg_inv_wq);
536fail_wb_wq:
537 destroy_workqueue(client->wb_wq);
538fail:
539 kfree(client);
540 return ERR_PTR(err);
541}
542
543static void ceph_destroy_client(struct ceph_client *client)
544{
545 dout("destroy_client %p\n", client);
546
547 /* unmount */
548 ceph_mdsc_stop(&client->mdsc);
549 ceph_monc_stop(&client->monc);
550 ceph_osdc_stop(&client->osdc);
551
552 kfree(client->signed_ticket);
553
554 ceph_debugfs_client_cleanup(client);
555 destroy_workqueue(client->wb_wq);
556 destroy_workqueue(client->pg_inv_wq);
557 destroy_workqueue(client->trunc_wq);
558
559 if (client->msgr)
560 ceph_messenger_destroy(client->msgr);
561 if (client->wb_pagevec_pool)
562 mempool_destroy(client->wb_pagevec_pool);
563
564 release_mount_args(&client->mount_args);
565
566 kfree(client);
567 dout("destroy_client %p done\n", client);
568}
569
570/*
571 * true if we have the mon map (and have thus joined the cluster)
572 */
573static int have_mon_map(struct ceph_client *client)
574{
575 return client->monc.monmap && client->monc.monmap->epoch;
576}
577
578/*
579 * Bootstrap mount by opening the root directory. Note the mount
580 * @started time from caller, and time out if this takes too long.
581 */
582static struct dentry *open_root_dentry(struct ceph_client *client,
583 const char *path,
584 unsigned long started)
585{
586 struct ceph_mds_client *mdsc = &client->mdsc;
587 struct ceph_mds_request *req = NULL;
588 int err;
589 struct dentry *root;
590
591 /* open dir */
592 dout("open_root_inode opening '%s'\n", path);
593 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
594 if (IS_ERR(req))
595 return ERR_PTR(PTR_ERR(req));
596 req->r_path1 = kstrdup(path, GFP_NOFS);
597 req->r_ino1.ino = CEPH_INO_ROOT;
598 req->r_ino1.snap = CEPH_NOSNAP;
599 req->r_started = started;
600 req->r_timeout = client->mount_args.mount_timeout * HZ;
601 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
602 req->r_num_caps = 2;
603 err = ceph_mdsc_do_request(mdsc, NULL, req);
604 if (err == 0) {
605 dout("open_root_inode success\n");
606 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
607 client->sb->s_root == NULL)
608 root = d_alloc_root(req->r_target_inode);
609 else
610 root = d_obtain_alias(req->r_target_inode);
611 req->r_target_inode = NULL;
612 dout("open_root_inode success, root dentry is %p\n", root);
613 } else {
614 root = ERR_PTR(err);
615 }
616 ceph_mdsc_put_request(req);
617 return root;
618}
619
620/*
621 * mount: join the ceph cluster, and open root directory.
622 */
623static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
624 const char *path)
625{
626 struct ceph_entity_addr *myaddr = NULL;
627 int err;
628 unsigned long timeout = client->mount_args.mount_timeout * HZ;
629 unsigned long started = jiffies; /* note the start time */
630 struct dentry *root;
631
632 dout("mount start\n");
633 mutex_lock(&client->mount_mutex);
634
635 /* initialize the messenger */
636 if (client->msgr == NULL) {
637 if (ceph_test_opt(client, MYIP))
638 myaddr = &client->mount_args.my_addr;
639 client->msgr = ceph_messenger_create(myaddr);
640 if (IS_ERR(client->msgr)) {
641 err = PTR_ERR(client->msgr);
642 client->msgr = NULL;
643 goto out;
644 }
645 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
646 }
647
648 /* send mount request, and wait for mon, mds, and osd maps */
649 err = ceph_monc_request_mount(&client->monc);
650 if (err < 0)
651 goto out;
652
653 while (!have_mon_map(client) && !client->mount_err) {
654 err = -EIO;
655 if (timeout && time_after_eq(jiffies, started + timeout))
656 goto out;
657
658 /* wait */
659 dout("mount waiting for mount\n");
660 err = wait_event_interruptible_timeout(client->mount_wq,
661 client->mount_err || have_mon_map(client),
662 timeout);
663 if (err == -EINTR || err == -ERESTARTSYS)
664 goto out;
665 if (client->mount_err) {
666 err = client->mount_err;
667 goto out;
668 }
669 }
670
671 dout("mount opening root\n");
672 root = open_root_dentry(client, "", started);
673 if (IS_ERR(root)) {
674 err = PTR_ERR(root);
675 goto out;
676 }
677 if (client->sb->s_root)
678 dput(root);
679 else
680 client->sb->s_root = root;
681
682 if (path[0] == 0) {
683 dget(root);
684 } else {
685 dout("mount opening base mountpoint\n");
686 root = open_root_dentry(client, path, started);
687 if (IS_ERR(root)) {
688 err = PTR_ERR(root);
689 dput(client->sb->s_root);
690 client->sb->s_root = NULL;
691 goto out;
692 }
693 }
694
695 mnt->mnt_root = root;
696 mnt->mnt_sb = client->sb;
697
698 client->mount_state = CEPH_MOUNT_MOUNTED;
699 dout("mount success\n");
700 err = 0;
701
702out:
703 mutex_unlock(&client->mount_mutex);
704 return err;
705}
706
707static int ceph_set_super(struct super_block *s, void *data)
708{
709 struct ceph_client *client = data;
710 int ret;
711
712 dout("set_super %p data %p\n", s, data);
713
714 s->s_flags = client->mount_args.sb_flags;
715 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
716
717 s->s_fs_info = client;
718 client->sb = s;
719
720 s->s_op = &ceph_super_ops;
721 s->s_export_op = &ceph_export_ops;
722
723 s->s_time_gran = 1000; /* 1000 ns == 1 us */
724
725 ret = set_anon_super(s, NULL); /* what is that second arg for? */
726 if (ret != 0)
727 goto fail;
728
729 return ret;
730
731fail:
732 s->s_fs_info = NULL;
733 client->sb = NULL;
734 return ret;
735}
736
737/*
738 * share superblock if same fs AND options
739 */
740static int ceph_compare_super(struct super_block *sb, void *data)
741{
742 struct ceph_client *new = data;
743 struct ceph_mount_args *args = &new->mount_args;
744 struct ceph_client *other = ceph_sb_to_client(sb);
745 int i;
746
747 dout("ceph_compare_super %p\n", sb);
748 if (args->flags & CEPH_OPT_FSID) {
749 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
750 dout("fsid doesn't match\n");
751 return 0;
752 }
753 } else {
754 /* do we share (a) monitor? */
755 for (i = 0; i < new->monc.monmap->num_mon; i++)
756 if (ceph_monmap_contains(other->monc.monmap,
757 &new->monc.monmap->mon_inst[i].addr))
758 break;
759 if (i == new->monc.monmap->num_mon) {
760 dout("mon ip not part of monmap\n");
761 return 0;
762 }
763 dout("mon ip matches existing sb %p\n", sb);
764 }
765 if (args->sb_flags != other->mount_args.sb_flags) {
766 dout("flags differ\n");
767 return 0;
768 }
769 return 1;
770}
771
772/*
773 * construct our own bdi so we can control readahead, etc.
774 */
775static int ceph_init_bdi(struct super_block *sb, struct ceph_client *client)
776{
777 int err;
778
779 err = bdi_init(&client->backing_dev_info);
780 if (err < 0)
781 return err;
f2cf418c 782 sb->s_bdi = &client->backing_dev_info;
16725b9d
SW		 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);
16725b9d 867 kill_anon_super(s); /* will call put_super after sb is r/o */
f2cf418c 868 bdi_unregister(&client->backing_dev_info);
16725b9d
SW		 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
fa0b72e9
SW		 906 pr_info("loaded %d.%d.%d (mon/mds/osd proto %d/%d/%d)\n",
907 CEPH_VERSION_MAJOR, CEPH_VERSION_MINOR, CEPH_VERSION_PATCH,
908 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL);
16725b9d
SW		 909 return 0;
910
911out_icache:
912 destroy_caches();
913out_msgr:
914 ceph_msgr_exit();
915out_debugfs:
916 ceph_debugfs_cleanup();
917out:
918 return ret;
919}
920
921static void __exit exit_ceph(void)
922{
923 dout("exit_ceph\n");
924 unregister_filesystem(&ceph_fs_type);
925 ceph_caps_finalize();
926 destroy_caches();
927 ceph_msgr_exit();
928 ceph_debugfs_cleanup();
929}
930
931module_init(init_ceph);
932module_exit(exit_ceph);
933
934MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
935MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
936MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
937MODULE_DESCRIPTION("Ceph filesystem for Linux");
938MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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