1
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/backing-dev.h>
5#include <linux/ctype.h>
6#include <linux/fs.h>
7#include <linux/inet.h>
8#include <linux/in6.h>
9#include <linux/module.h>
10#include <linux/mount.h>
11#include <linux/parser.h>
12#include <linux/sched.h>
13#include <linux/seq_file.h>
14#include <linux/slab.h>
15#include <linux/statfs.h>
16#include <linux/string.h>
17
18#include "super.h"
19#include "mds_client.h"
20
21#include <linux/ceph/decode.h>
22#include <linux/ceph/mon_client.h>
23#include <linux/ceph/auth.h>
24#include <linux/ceph/debugfs.h>
25
26
27
28
29
30
31
32
33
34
35static void ceph_put_super(struct super_block *s)
36{
37 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
38
39 dout("put_super\n");
40 ceph_mdsc_close_sessions(fsc->mdsc);
41
42
43
44
45
46 if (s->s_bdi == &fsc->backing_dev_info) {
47 bdi_unregister(&fsc->backing_dev_info);
48 s->s_bdi = NULL;
49 }
50
51 return;
52}
53
54static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
55{
56 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
57 struct ceph_monmap *monmap = fsc->client->monc.monmap;
58 struct ceph_statfs st;
59 u64 fsid;
60 int err;
61
62 dout("statfs\n");
63 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
64 if (err < 0)
65 return err;
66
67
68 buf->f_type = CEPH_SUPER_MAGIC;
69
70
71
72
73
74 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
75 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
76 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
77 (CEPH_BLOCK_SHIFT-10);
78 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
79
80 buf->f_files = le64_to_cpu(st.num_objects);
81 buf->f_ffree = -1;
82 buf->f_namelen = NAME_MAX;
83 buf->f_frsize = PAGE_CACHE_SIZE;
84
85
86 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
87 buf->f_fsid.val[0] = fsid & 0xffffffff;
88 buf->f_fsid.val[1] = fsid >> 32;
89
90 return 0;
91}
92
93
94static int ceph_sync_fs(struct super_block *sb, int wait)
95{
96 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
97
98 if (!wait) {
99 dout("sync_fs (non-blocking)\n");
100 ceph_flush_dirty_caps(fsc->mdsc);
101 dout("sync_fs (non-blocking) done\n");
102 return 0;
103 }
104
105 dout("sync_fs (blocking)\n");
106 ceph_osdc_sync(&fsc->client->osdc);
107 ceph_mdsc_sync(fsc->mdsc);
108 dout("sync_fs (blocking) done\n");
109 return 0;
110}
111
112
113
114
115enum {
116 Opt_wsize,
117 Opt_rsize,
118 Opt_caps_wanted_delay_min,
119 Opt_caps_wanted_delay_max,
120 Opt_cap_release_safety,
121 Opt_readdir_max_entries,
122 Opt_readdir_max_bytes,
123 Opt_congestion_kb,
124 Opt_last_int,
125
126 Opt_snapdirname,
127 Opt_last_string,
128
129 Opt_dirstat,
130 Opt_nodirstat,
131 Opt_rbytes,
132 Opt_norbytes,
133 Opt_noasyncreaddir,
134};
135
136static match_table_t fsopt_tokens = {
137 {Opt_wsize, "wsize=%d"},
138 {Opt_rsize, "rsize=%d"},
139 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
140 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
141 {Opt_cap_release_safety, "cap_release_safety=%d"},
142 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
143 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
144 {Opt_congestion_kb, "write_congestion_kb=%d"},
145
146 {Opt_snapdirname, "snapdirname=%s"},
147
148 {Opt_dirstat, "dirstat"},
149 {Opt_nodirstat, "nodirstat"},
150 {Opt_rbytes, "rbytes"},
151 {Opt_norbytes, "norbytes"},
152 {Opt_noasyncreaddir, "noasyncreaddir"},
153 {-1, NULL}
154};
155
156static int parse_fsopt_token(char *c, void *private)
157{
158 struct ceph_mount_options *fsopt = private;
159 substring_t argstr[MAX_OPT_ARGS];
160 int token, intval, ret;
161
162 token = match_token((char *)c, fsopt_tokens, argstr);
163 if (token < 0)
164 return -EINVAL;
165
166 if (token < Opt_last_int) {
167 ret = match_int(&argstr[0], &intval);
168 if (ret < 0) {
169 pr_err("bad mount option arg (not int) "
170 "at '%s'\n", c);
171 return ret;
172 }
173 dout("got int token %d val %d\n", token, intval);
174 } else if (token > Opt_last_int && token < Opt_last_string) {
175 dout("got string token %d val %s\n", token,
176 argstr[0].from);
177 } else {
178 dout("got token %d\n", token);
179 }
180
181 switch (token) {
182 case Opt_snapdirname:
183 kfree(fsopt->snapdir_name);
184 fsopt->snapdir_name = kstrndup(argstr[0].from,
185 argstr[0].to-argstr[0].from,
186 GFP_KERNEL);
187 if (!fsopt->snapdir_name)
188 return -ENOMEM;
189 break;
190
191
192 case Opt_wsize:
193 fsopt->wsize = intval;
194 break;
195 case Opt_rsize:
196 fsopt->rsize = intval;
197 break;
198 case Opt_caps_wanted_delay_min:
199 fsopt->caps_wanted_delay_min = intval;
200 break;
201 case Opt_caps_wanted_delay_max:
202 fsopt->caps_wanted_delay_max = intval;
203 break;
204 case Opt_readdir_max_entries:
205 fsopt->max_readdir = intval;
206 break;
207 case Opt_readdir_max_bytes:
208 fsopt->max_readdir_bytes = intval;
209 break;
210 case Opt_congestion_kb:
211 fsopt->congestion_kb = intval;
212 break;
213 case Opt_dirstat:
214 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
215 break;
216 case Opt_nodirstat:
217 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
218 break;
219 case Opt_rbytes:
220 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
221 break;
222 case Opt_norbytes:
223 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
224 break;
225 case Opt_noasyncreaddir:
226 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
227 break;
228 default:
229 BUG_ON(token);
230 }
231 return 0;
232}
233
234static void destroy_mount_options(struct ceph_mount_options *args)
235{
236 dout("destroy_mount_options %p\n", args);
237 kfree(args->snapdir_name);
238 kfree(args);
239}
240
241static int strcmp_null(const char *s1, const char *s2)
242{
243 if (!s1 && !s2)
244 return 0;
245 if (s1 && !s2)
246 return -1;
247 if (!s1 && s2)
248 return 1;
249 return strcmp(s1, s2);
250}
251
252static int compare_mount_options(struct ceph_mount_options *new_fsopt,
253 struct ceph_options *new_opt,
254 struct ceph_fs_client *fsc)
255{
256 struct ceph_mount_options *fsopt1 = new_fsopt;
257 struct ceph_mount_options *fsopt2 = fsc->mount_options;
258 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
259 int ret;
260
261 ret = memcmp(fsopt1, fsopt2, ofs);
262 if (ret)
263 return ret;
264
265 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
266 if (ret)
267 return ret;
268
269 return ceph_compare_options(new_opt, fsc->client);
270}
271
272static int parse_mount_options(struct ceph_mount_options **pfsopt,
273 struct ceph_options **popt,
274 int flags, char *options,
275 const char *dev_name,
276 const char **path)
277{
278 struct ceph_mount_options *fsopt;
279 const char *dev_name_end;
280 int err = -ENOMEM;
281
282 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
283 if (!fsopt)
284 return -ENOMEM;
285
286 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
287
288 fsopt->sb_flags = flags;
289 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
290
291 fsopt->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
292 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
293 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
294 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
295 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
296 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
297 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
298 fsopt->congestion_kb = default_congestion_kb();
299
300
301 err = -EINVAL;
302 if (!dev_name)
303 goto out;
304 *path = strstr(dev_name, ":/");
305 if (*path == NULL) {
306 pr_err("device name is missing path (no :/ in %s)\n",
307 dev_name);
308 goto out;
309 }
310 dev_name_end = *path;
311 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
312
313
314 *path += 2;
315 dout("server path '%s'\n", *path);
316
317 err = ceph_parse_options(popt, options, dev_name, dev_name_end,
318 parse_fsopt_token, (void *)fsopt);
319 if (err)
320 goto out;
321
322
323 *pfsopt = fsopt;
324 return 0;
325
326out:
327 destroy_mount_options(fsopt);
328 return err;
329}
330
331
332
333
334
335
336static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
337{
338 struct ceph_fs_client *fsc = ceph_sb_to_client(mnt->mnt_sb);
339 struct ceph_mount_options *fsopt = fsc->mount_options;
340 struct ceph_options *opt = fsc->client->options;
341
342 if (opt->flags & CEPH_OPT_FSID)
343 seq_printf(m, ",fsid=%pU", &opt->fsid);
344 if (opt->flags & CEPH_OPT_NOSHARE)
345 seq_puts(m, ",noshare");
346 if (opt->flags & CEPH_OPT_NOCRC)
347 seq_puts(m, ",nocrc");
348
349 if (opt->name)
350 seq_printf(m, ",name=%s", opt->name);
351 if (opt->secret)
352 seq_puts(m, ",secret=<hidden>");
353
354 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
355 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
356 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
357 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
358 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
359 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout);
360 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
361 seq_printf(m, ",osdkeepalivetimeout=%d",
362 opt->osd_keepalive_timeout);
363
364 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
365 seq_puts(m, ",dirstat");
366 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
367 seq_puts(m, ",norbytes");
368 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
369 seq_puts(m, ",noasyncreaddir");
370
371 if (fsopt->wsize)
372 seq_printf(m, ",wsize=%d", fsopt->wsize);
373 if (fsopt->rsize != CEPH_MOUNT_RSIZE_DEFAULT)
374 seq_printf(m, ",rsize=%d", fsopt->rsize);
375 if (fsopt->congestion_kb != default_congestion_kb())
376 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
377 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
378 seq_printf(m, ",caps_wanted_delay_min=%d",
379 fsopt->caps_wanted_delay_min);
380 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
381 seq_printf(m, ",caps_wanted_delay_max=%d",
382 fsopt->caps_wanted_delay_max);
383 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
384 seq_printf(m, ",cap_release_safety=%d",
385 fsopt->cap_release_safety);
386 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
387 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
388 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
389 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
390 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
391 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
392 return 0;
393}
394
395
396
397
398
399static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
400{
401 struct ceph_fs_client *fsc = client->private;
402 int type = le16_to_cpu(msg->hdr.type);
403
404 switch (type) {
405 case CEPH_MSG_MDS_MAP:
406 ceph_mdsc_handle_map(fsc->mdsc, msg);
407 return 0;
408
409 default:
410 return -1;
411 }
412}
413
414
415
416
417struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
418 struct ceph_options *opt)
419{
420 struct ceph_fs_client *fsc;
421 int err = -ENOMEM;
422
423 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
424 if (!fsc)
425 return ERR_PTR(-ENOMEM);
426
427 fsc->client = ceph_create_client(opt, fsc);
428 if (IS_ERR(fsc->client)) {
429 err = PTR_ERR(fsc->client);
430 goto fail;
431 }
432 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
433 fsc->client->supported_features |= CEPH_FEATURE_FLOCK |
434 CEPH_FEATURE_DIRLAYOUTHASH;
435 fsc->client->monc.want_mdsmap = 1;
436
437 fsc->mount_options = fsopt;
438
439 fsc->sb = NULL;
440 fsc->mount_state = CEPH_MOUNT_MOUNTING;
441
442 atomic_long_set(&fsc->writeback_count, 0);
443
444 err = bdi_init(&fsc->backing_dev_info);
445 if (err < 0)
446 goto fail_client;
447
448 err = -ENOMEM;
449
450
451
452
453 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
454 if (fsc->wb_wq == NULL)
455 goto fail_bdi;
456 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
457 if (fsc->pg_inv_wq == NULL)
458 goto fail_wb_wq;
459 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
460 if (fsc->trunc_wq == NULL)
461 goto fail_pg_inv_wq;
462
463
464 err = -ENOMEM;
465 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
466 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
467 if (!fsc->wb_pagevec_pool)
468 goto fail_trunc_wq;
469
470
471 fsc->min_caps = fsopt->max_readdir;
472
473 return fsc;
474
475fail_trunc_wq:
476 destroy_workqueue(fsc->trunc_wq);
477fail_pg_inv_wq:
478 destroy_workqueue(fsc->pg_inv_wq);
479fail_wb_wq:
480 destroy_workqueue(fsc->wb_wq);
481fail_bdi:
482 bdi_destroy(&fsc->backing_dev_info);
483fail_client:
484 ceph_destroy_client(fsc->client);
485fail:
486 kfree(fsc);
487 return ERR_PTR(err);
488}
489
490void destroy_fs_client(struct ceph_fs_client *fsc)
491{
492 dout("destroy_fs_client %p\n", fsc);
493
494 destroy_workqueue(fsc->wb_wq);
495 destroy_workqueue(fsc->pg_inv_wq);
496 destroy_workqueue(fsc->trunc_wq);
497
498 bdi_destroy(&fsc->backing_dev_info);
499
500 mempool_destroy(fsc->wb_pagevec_pool);
501
502 destroy_mount_options(fsc->mount_options);
503
504 ceph_fs_debugfs_cleanup(fsc);
505
506 ceph_destroy_client(fsc->client);
507
508 kfree(fsc);
509 dout("destroy_fs_client %p done\n", fsc);
510}
511
512
513
514
515struct kmem_cache *ceph_inode_cachep;
516struct kmem_cache *ceph_cap_cachep;
517struct kmem_cache *ceph_dentry_cachep;
518struct kmem_cache *ceph_file_cachep;
519
520static void ceph_inode_init_once(void *foo)
521{
522 struct ceph_inode_info *ci = foo;
523 inode_init_once(&ci->vfs_inode);
524}
525
526static int __init init_caches(void)
527{
528 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
529 sizeof(struct ceph_inode_info),
530 __alignof__(struct ceph_inode_info),
531 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
532 ceph_inode_init_once);
533 if (ceph_inode_cachep == NULL)
534 return -ENOMEM;
535
536 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
537 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
538 if (ceph_cap_cachep == NULL)
539 goto bad_cap;
540
541 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
542 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
543 if (ceph_dentry_cachep == NULL)
544 goto bad_dentry;
545
546 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
547 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
548 if (ceph_file_cachep == NULL)
549 goto bad_file;
550
551 return 0;
552
553bad_file:
554 kmem_cache_destroy(ceph_dentry_cachep);
555bad_dentry:
556 kmem_cache_destroy(ceph_cap_cachep);
557bad_cap:
558 kmem_cache_destroy(ceph_inode_cachep);
559 return -ENOMEM;
560}
561
562static void destroy_caches(void)
563{
564 kmem_cache_destroy(ceph_inode_cachep);
565 kmem_cache_destroy(ceph_cap_cachep);
566 kmem_cache_destroy(ceph_dentry_cachep);
567 kmem_cache_destroy(ceph_file_cachep);
568}
569
570
571
572
573
574
575static void ceph_umount_begin(struct super_block *sb)
576{
577 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
578
579 dout("ceph_umount_begin - starting forced umount\n");
580 if (!fsc)
581 return;
582 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
583 return;
584}
585
586static const struct super_operations ceph_super_ops = {
587 .alloc_inode = ceph_alloc_inode,
588 .destroy_inode = ceph_destroy_inode,
589 .write_inode = ceph_write_inode,
590 .sync_fs = ceph_sync_fs,
591 .put_super = ceph_put_super,
592 .show_options = ceph_show_options,
593 .statfs = ceph_statfs,
594 .umount_begin = ceph_umount_begin,
595};
596
597
598
599
600
601static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
602 const char *path,
603 unsigned long started)
604{
605 struct ceph_mds_client *mdsc = fsc->mdsc;
606 struct ceph_mds_request *req = NULL;
607 int err;
608 struct dentry *root;
609
610
611 dout("open_root_inode opening '%s'\n", path);
612 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
613 if (IS_ERR(req))
614 return ERR_CAST(req);
615 req->r_path1 = kstrdup(path, GFP_NOFS);
616 req->r_ino1.ino = CEPH_INO_ROOT;
617 req->r_ino1.snap = CEPH_NOSNAP;
618 req->r_started = started;
619 req->r_timeout = fsc->client->options->mount_timeout * HZ;
620 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
621 req->r_num_caps = 2;
622 err = ceph_mdsc_do_request(mdsc, NULL, req);
623 if (err == 0) {
624 dout("open_root_inode success\n");
625 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
626 fsc->sb->s_root == NULL)
627 root = d_alloc_root(req->r_target_inode);
628 else
629 root = d_obtain_alias(req->r_target_inode);
630 req->r_target_inode = NULL;
631 dout("open_root_inode success, root dentry is %p\n", root);
632 } else {
633 root = ERR_PTR(err);
634 }
635 ceph_mdsc_put_request(req);
636 return root;
637}
638
639
640
641
642
643
644
645static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
646 const char *path)
647{
648 int err;
649 unsigned long started = jiffies;
650 struct dentry *root;
651 int first = 0;
652
653 dout("mount start\n");
654 mutex_lock(&fsc->client->mount_mutex);
655
656 err = __ceph_open_session(fsc->client, started);
657 if (err < 0)
658 goto out;
659
660 dout("mount opening root\n");
661 root = open_root_dentry(fsc, "", started);
662 if (IS_ERR(root)) {
663 err = PTR_ERR(root);
664 goto out;
665 }
666 if (fsc->sb->s_root) {
667 dput(root);
668 } else {
669 fsc->sb->s_root = root;
670 first = 1;
671
672 err = ceph_fs_debugfs_init(fsc);
673 if (err < 0)
674 goto fail;
675 }
676
677 if (path[0] == 0) {
678 dget(root);
679 } else {
680 dout("mount opening base mountpoint\n");
681 root = open_root_dentry(fsc, path, started);
682 if (IS_ERR(root)) {
683 err = PTR_ERR(root);
684 goto fail;
685 }
686 }
687
688 fsc->mount_state = CEPH_MOUNT_MOUNTED;
689 dout("mount success\n");
690 mutex_unlock(&fsc->client->mount_mutex);
691 return root;
692
693out:
694 mutex_unlock(&fsc->client->mount_mutex);
695 return ERR_PTR(err);
696
697fail:
698 if (first) {
699 dput(fsc->sb->s_root);
700 fsc->sb->s_root = NULL;
701 }
702 goto out;
703}
704
705static int ceph_set_super(struct super_block *s, void *data)
706{
707 struct ceph_fs_client *fsc = data;
708 int ret;
709
710 dout("set_super %p data %p\n", s, data);
711
712 s->s_flags = fsc->mount_options->sb_flags;
713 s->s_maxbytes = 1ULL << 40;
714
715 s->s_fs_info = fsc;
716 fsc->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;
722
723 ret = set_anon_super(s, NULL);
724 if (ret != 0)
725 goto fail;
726
727 return ret;
728
729fail:
730 s->s_fs_info = NULL;
731 fsc->sb = NULL;
732 return ret;
733}
734
735
736
737
738static int ceph_compare_super(struct super_block *sb, void *data)
739{
740 struct ceph_fs_client *new = data;
741 struct ceph_mount_options *fsopt = new->mount_options;
742 struct ceph_options *opt = new->client->options;
743 struct ceph_fs_client *other = ceph_sb_to_client(sb);
744
745 dout("ceph_compare_super %p\n", sb);
746
747 if (compare_mount_options(fsopt, opt, other)) {
748 dout("monitor(s)/mount options don't match\n");
749 return 0;
750 }
751 if ((opt->flags & CEPH_OPT_FSID) &&
752 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
753 dout("fsid doesn't match\n");
754 return 0;
755 }
756 if (fsopt->sb_flags != other->mount_options->sb_flags) {
757 dout("flags differ\n");
758 return 0;
759 }
760 return 1;
761}
762
763
764
765
766static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
767
768static int ceph_register_bdi(struct super_block *sb,
769 struct ceph_fs_client *fsc)
770{
771 int err;
772
773
774 if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE)
775 fsc->backing_dev_info.ra_pages =
776 (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1)
777 >> PAGE_SHIFT;
778 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
779 atomic_long_inc_return(&bdi_seq));
780 if (!err)
781 sb->s_bdi = &fsc->backing_dev_info;
782 return err;
783}
784
785static struct dentry *ceph_mount(struct file_system_type *fs_type,
786 int flags, const char *dev_name, void *data)
787{
788 struct super_block *sb;
789 struct ceph_fs_client *fsc;
790 struct dentry *res;
791 int err;
792 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
793 const char *path = NULL;
794 struct ceph_mount_options *fsopt = NULL;
795 struct ceph_options *opt = NULL;
796
797 dout("ceph_mount\n");
798 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
799 if (err < 0) {
800 res = ERR_PTR(err);
801 goto out_final;
802 }
803
804
805 fsc = create_fs_client(fsopt, opt);
806 if (IS_ERR(fsc)) {
807 res = ERR_CAST(fsc);
808 kfree(fsopt);
809 kfree(opt);
810 goto out_final;
811 }
812
813 err = ceph_mdsc_init(fsc);
814 if (err < 0) {
815 res = ERR_PTR(err);
816 goto out;
817 }
818
819 if (ceph_test_opt(fsc->client, NOSHARE))
820 compare_super = NULL;
821 sb = sget(fs_type, compare_super, ceph_set_super, fsc);
822 if (IS_ERR(sb)) {
823 res = ERR_CAST(sb);
824 goto out;
825 }
826
827 if (ceph_sb_to_client(sb) != fsc) {
828 ceph_mdsc_destroy(fsc);
829 destroy_fs_client(fsc);
830 fsc = ceph_sb_to_client(sb);
831 dout("get_sb got existing client %p\n", fsc);
832 } else {
833 dout("get_sb using new client %p\n", fsc);
834 err = ceph_register_bdi(sb, fsc);
835 if (err < 0) {
836 res = ERR_PTR(err);
837 goto out_splat;
838 }
839 }
840
841 res = ceph_real_mount(fsc, path);
842 if (IS_ERR(res))
843 goto out_splat;
844 dout("root %p inode %p ino %llx.%llx\n", res,
845 res->d_inode, ceph_vinop(res->d_inode));
846 return res;
847
848out_splat:
849 ceph_mdsc_close_sessions(fsc->mdsc);
850 deactivate_locked_super(sb);
851 goto out_final;
852
853out:
854 ceph_mdsc_destroy(fsc);
855 destroy_fs_client(fsc);
856out_final:
857 dout("ceph_mount fail %ld\n", PTR_ERR(res));
858 return res;
859}
860
861static void ceph_kill_sb(struct super_block *s)
862{
863 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
864 dout("kill_sb %p\n", s);
865 ceph_mdsc_pre_umount(fsc->mdsc);
866 kill_anon_super(s);
867 ceph_mdsc_destroy(fsc);
868 destroy_fs_client(fsc);
869}
870
871static struct file_system_type ceph_fs_type = {
872 .owner = THIS_MODULE,
873 .name = "ceph",
874 .mount = ceph_mount,
875 .kill_sb = ceph_kill_sb,
876 .fs_flags = FS_RENAME_DOES_D_MOVE,
877};
878
879#define _STRINGIFY(x) #x
880#define STRINGIFY(x) _STRINGIFY(x)
881
882static int __init init_ceph(void)
883{
884 int ret = init_caches();
885 if (ret)
886 goto out;
887
888 ret = register_filesystem(&ceph_fs_type);
889 if (ret)
890 goto out_icache;
891
892 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
893
894 return 0;
895
896out_icache:
897 destroy_caches();
898out:
899 return ret;
900}
901
902static void __exit exit_ceph(void)
903{
904 dout("exit_ceph\n");
905 unregister_filesystem(&ceph_fs_type);
906 destroy_caches();
907}
908
909module_init(init_ceph);
910module_exit(exit_ceph);
911
912MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
913MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
914MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
915MODULE_DESCRIPTION("Ceph filesystem for Linux");
916MODULE_LICENSE("GPL");
917
