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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 * Ceph superblock operations
28 *
29 * Handle the basics of mounting, unmounting.
30 */
31
32/*
33 * super ops
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 * ensure we release the bdi before put_anon_super releases
44 * the device name.
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 /* fill in kstatfs */
68 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
69
70 /*
71 * express utilization in terms of large blocks to avoid
72 * overflow on 32-bit machines.
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_avail) >> (CEPH_BLOCK_SHIFT-10);
77 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
78
79 buf->f_files = le64_to_cpu(st.num_objects);
80 buf->f_ffree = -1;
81 buf->f_namelen = NAME_MAX;
82 buf->f_frsize = PAGE_CACHE_SIZE;
83
84 /* leave fsid little-endian, regardless of host endianness */
85 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
86 buf->f_fsid.val[0] = fsid & 0xffffffff;
87 buf->f_fsid.val[1] = fsid >> 32;
88
89 return 0;
90}
91
92
93static int ceph_sync_fs(struct super_block *sb, int wait)
94{
95 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
96
97 if (!wait) {
98 dout("sync_fs (non-blocking)\n");
99 ceph_flush_dirty_caps(fsc->mdsc);
100 dout("sync_fs (non-blocking) done\n");
101 return 0;
102 }
103
104 dout("sync_fs (blocking)\n");
105 ceph_osdc_sync(&fsc->client->osdc);
106 ceph_mdsc_sync(fsc->mdsc);
107 dout("sync_fs (blocking) done\n");
108 return 0;
109}
110
111/*
112 * mount options
113 */
114enum {
115 Opt_wsize,
116 Opt_rsize,
117 Opt_caps_wanted_delay_min,
118 Opt_caps_wanted_delay_max,
119 Opt_cap_release_safety,
120 Opt_readdir_max_entries,
121 Opt_readdir_max_bytes,
122 Opt_congestion_kb,
123 Opt_last_int,
124 /* int args above */
125 Opt_snapdirname,
126 Opt_last_string,
127 /* string args above */
128 Opt_dirstat,
129 Opt_nodirstat,
130 Opt_rbytes,
131 Opt_norbytes,
132 Opt_noasyncreaddir,
133 Opt_ino32,
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 /* int args above */
146 {Opt_snapdirname, "snapdirname=%s"},
147 /* string args above */
148 {Opt_dirstat, "dirstat"},
149 {Opt_nodirstat, "nodirstat"},
150 {Opt_rbytes, "rbytes"},
151 {Opt_norbytes, "norbytes"},
152 {Opt_noasyncreaddir, "noasyncreaddir"},
153 {Opt_ino32, "ino32"},
154 {-1, NULL}
155};
156
157static int parse_fsopt_token(char *c, void *private)
158{
159 struct ceph_mount_options *fsopt = private;
160 substring_t argstr[MAX_OPT_ARGS];
161 int token, intval, ret;
162
163 token = match_token((char *)c, fsopt_tokens, argstr);
164 if (token < 0)
165 return -EINVAL;
166
167 if (token < Opt_last_int) {
168 ret = match_int(&argstr[0], &intval);
169 if (ret < 0) {
170 pr_err("bad mount option arg (not int) "
171 "at '%s'\n", c);
172 return ret;
173 }
174 dout("got int token %d val %d\n", token, intval);
175 } else if (token > Opt_last_int && token < Opt_last_string) {
176 dout("got string token %d val %s\n", token,
177 argstr[0].from);
178 } else {
179 dout("got token %d\n", token);
180 }
181
182 switch (token) {
183 case Opt_snapdirname:
184 kfree(fsopt->snapdir_name);
185 fsopt->snapdir_name = kstrndup(argstr[0].from,
186 argstr[0].to-argstr[0].from,
187 GFP_KERNEL);
188 if (!fsopt->snapdir_name)
189 return -ENOMEM;
190 break;
191
192 /* misc */
193 case Opt_wsize:
194 fsopt->wsize = intval;
195 break;
196 case Opt_rsize:
197 fsopt->rsize = intval;
198 break;
199 case Opt_caps_wanted_delay_min:
200 fsopt->caps_wanted_delay_min = intval;
201 break;
202 case Opt_caps_wanted_delay_max:
203 fsopt->caps_wanted_delay_max = intval;
204 break;
205 case Opt_readdir_max_entries:
206 fsopt->max_readdir = intval;
207 break;
208 case Opt_readdir_max_bytes:
209 fsopt->max_readdir_bytes = intval;
210 break;
211 case Opt_congestion_kb:
212 fsopt->congestion_kb = intval;
213 break;
214 case Opt_dirstat:
215 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
216 break;
217 case Opt_nodirstat:
218 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
219 break;
220 case Opt_rbytes:
221 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
222 break;
223 case Opt_norbytes:
224 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
225 break;
226 case Opt_noasyncreaddir:
227 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
228 break;
229 case Opt_ino32:
230 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
231 break;
232 default:
233 BUG_ON(token);
234 }
235 return 0;
236}
237
238static void destroy_mount_options(struct ceph_mount_options *args)
239{
240 dout("destroy_mount_options %p\n", args);
241 kfree(args->snapdir_name);
242 kfree(args);
243}
244
245static int strcmp_null(const char *s1, const char *s2)
246{
247 if (!s1 && !s2)
248 return 0;
249 if (s1 && !s2)
250 return -1;
251 if (!s1 && s2)
252 return 1;
253 return strcmp(s1, s2);
254}
255
256static int compare_mount_options(struct ceph_mount_options *new_fsopt,
257 struct ceph_options *new_opt,
258 struct ceph_fs_client *fsc)
259{
260 struct ceph_mount_options *fsopt1 = new_fsopt;
261 struct ceph_mount_options *fsopt2 = fsc->mount_options;
262 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
263 int ret;
264
265 ret = memcmp(fsopt1, fsopt2, ofs);
266 if (ret)
267 return ret;
268
269 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
270 if (ret)
271 return ret;
272
273 return ceph_compare_options(new_opt, fsc->client);
274}
275
276static int parse_mount_options(struct ceph_mount_options **pfsopt,
277 struct ceph_options **popt,
278 int flags, char *options,
279 const char *dev_name,
280 const char **path)
281{
282 struct ceph_mount_options *fsopt;
283 const char *dev_name_end;
284 int err = -ENOMEM;
285
286 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
287 if (!fsopt)
288 return -ENOMEM;
289
290 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
291
292 fsopt->sb_flags = flags;
293 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
294
295 fsopt->rsize = CEPH_RSIZE_DEFAULT;
296 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
297 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
298 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
299 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
300 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
301 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
302 fsopt->congestion_kb = default_congestion_kb();
303
304 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
305 err = -EINVAL;
306 if (!dev_name)
307 goto out;
308 *path = strstr(dev_name, ":/");
309 if (*path == NULL) {
310 pr_err("device name is missing path (no :/ in %s)\n",
311 dev_name);
312 goto out;
313 }
314 dev_name_end = *path;
315 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
316
317 /* path on server */
318 *path += 2;
319 dout("server path '%s'\n", *path);
320
321 err = ceph_parse_options(popt, options, dev_name, dev_name_end,
322 parse_fsopt_token, (void *)fsopt);
323 if (err)
324 goto out;
325
326 /* success */
327 *pfsopt = fsopt;
328 return 0;
329
330out:
331 destroy_mount_options(fsopt);
332 return err;
333}
334
335/**
336 * ceph_show_options - Show mount options in /proc/mounts
337 * @m: seq_file to write to
338 * @mnt: mount descriptor
339 */
340static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
341{
342 struct ceph_fs_client *fsc = ceph_sb_to_client(mnt->mnt_sb);
343 struct ceph_mount_options *fsopt = fsc->mount_options;
344 struct ceph_options *opt = fsc->client->options;
345
346 if (opt->flags & CEPH_OPT_FSID)
347 seq_printf(m, ",fsid=%pU", &opt->fsid);
348 if (opt->flags & CEPH_OPT_NOSHARE)
349 seq_puts(m, ",noshare");
350 if (opt->flags & CEPH_OPT_NOCRC)
351 seq_puts(m, ",nocrc");
352
353 if (opt->name)
354 seq_printf(m, ",name=%s", opt->name);
355 if (opt->key)
356 seq_puts(m, ",secret=<hidden>");
357
358 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
359 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
360 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
361 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
362 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
363 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout);
364 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
365 seq_printf(m, ",osdkeepalivetimeout=%d",
366 opt->osd_keepalive_timeout);
367
368 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
369 seq_puts(m, ",dirstat");
370 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
371 seq_puts(m, ",norbytes");
372 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
373 seq_puts(m, ",noasyncreaddir");
374
375 if (fsopt->wsize)
376 seq_printf(m, ",wsize=%d", fsopt->wsize);
377 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
378 seq_printf(m, ",rsize=%d", fsopt->rsize);
379 if (fsopt->congestion_kb != default_congestion_kb())
380 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
381 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
382 seq_printf(m, ",caps_wanted_delay_min=%d",
383 fsopt->caps_wanted_delay_min);
384 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
385 seq_printf(m, ",caps_wanted_delay_max=%d",
386 fsopt->caps_wanted_delay_max);
387 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
388 seq_printf(m, ",cap_release_safety=%d",
389 fsopt->cap_release_safety);
390 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
391 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
392 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
393 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
394 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
395 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
396 return 0;
397}
398
399/*
400 * handle any mon messages the standard library doesn't understand.
401 * return error if we don't either.
402 */
403static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
404{
405 struct ceph_fs_client *fsc = client->private;
406 int type = le16_to_cpu(msg->hdr.type);
407
408 switch (type) {
409 case CEPH_MSG_MDS_MAP:
410 ceph_mdsc_handle_map(fsc->mdsc, msg);
411 return 0;
412
413 default:
414 return -1;
415 }
416}
417
418/*
419 * create a new fs client
420 */
421struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
422 struct ceph_options *opt)
423{
424 struct ceph_fs_client *fsc;
425 int err = -ENOMEM;
426
427 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
428 if (!fsc)
429 return ERR_PTR(-ENOMEM);
430
431 fsc->client = ceph_create_client(opt, fsc);
432 if (IS_ERR(fsc->client)) {
433 err = PTR_ERR(fsc->client);
434 goto fail;
435 }
436 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
437 fsc->client->supported_features |= CEPH_FEATURE_FLOCK |
438 CEPH_FEATURE_DIRLAYOUTHASH;
439 fsc->client->monc.want_mdsmap = 1;
440
441 fsc->mount_options = fsopt;
442
443 fsc->sb = NULL;
444 fsc->mount_state = CEPH_MOUNT_MOUNTING;
445
446 atomic_long_set(&fsc->writeback_count, 0);
447
448 err = bdi_init(&fsc->backing_dev_info);
449 if (err < 0)
450 goto fail_client;
451
452 err = -ENOMEM;
453 /*
454 * The number of concurrent works can be high but they don't need
455 * to be processed in parallel, limit concurrency.
456 */
457 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
458 if (fsc->wb_wq == NULL)
459 goto fail_bdi;
460 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
461 if (fsc->pg_inv_wq == NULL)
462 goto fail_wb_wq;
463 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
464 if (fsc->trunc_wq == NULL)
465 goto fail_pg_inv_wq;
466
467 /* set up mempools */
468 err = -ENOMEM;
469 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
470 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
471 if (!fsc->wb_pagevec_pool)
472 goto fail_trunc_wq;
473
474 /* caps */
475 fsc->min_caps = fsopt->max_readdir;
476
477 return fsc;
478
479fail_trunc_wq:
480 destroy_workqueue(fsc->trunc_wq);
481fail_pg_inv_wq:
482 destroy_workqueue(fsc->pg_inv_wq);
483fail_wb_wq:
484 destroy_workqueue(fsc->wb_wq);
485fail_bdi:
486 bdi_destroy(&fsc->backing_dev_info);
487fail_client:
488 ceph_destroy_client(fsc->client);
489fail:
490 kfree(fsc);
491 return ERR_PTR(err);
492}
493
494void destroy_fs_client(struct ceph_fs_client *fsc)
495{
496 dout("destroy_fs_client %p\n", fsc);
497
498 destroy_workqueue(fsc->wb_wq);
499 destroy_workqueue(fsc->pg_inv_wq);
500 destroy_workqueue(fsc->trunc_wq);
501
502 bdi_destroy(&fsc->backing_dev_info);
503
504 mempool_destroy(fsc->wb_pagevec_pool);
505
506 destroy_mount_options(fsc->mount_options);
507
508 ceph_fs_debugfs_cleanup(fsc);
509
510 ceph_destroy_client(fsc->client);
511
512 kfree(fsc);
513 dout("destroy_fs_client %p done\n", fsc);
514}
515
516/*
517 * caches
518 */
519struct kmem_cache *ceph_inode_cachep;
520struct kmem_cache *ceph_cap_cachep;
521struct kmem_cache *ceph_dentry_cachep;
522struct kmem_cache *ceph_file_cachep;
523
524static void ceph_inode_init_once(void *foo)
525{
526 struct ceph_inode_info *ci = foo;
527 inode_init_once(&ci->vfs_inode);
528}
529
530static int __init init_caches(void)
531{
532 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
533 sizeof(struct ceph_inode_info),
534 __alignof__(struct ceph_inode_info),
535 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
536 ceph_inode_init_once);
537 if (ceph_inode_cachep == NULL)
538 return -ENOMEM;
539
540 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
541 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
542 if (ceph_cap_cachep == NULL)
543 goto bad_cap;
544
545 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
546 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
547 if (ceph_dentry_cachep == NULL)
548 goto bad_dentry;
549
550 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
551 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
552 if (ceph_file_cachep == NULL)
553 goto bad_file;
554
555 return 0;
556
557bad_file:
558 kmem_cache_destroy(ceph_dentry_cachep);
559bad_dentry:
560 kmem_cache_destroy(ceph_cap_cachep);
561bad_cap:
562 kmem_cache_destroy(ceph_inode_cachep);
563 return -ENOMEM;
564}
565
566static void destroy_caches(void)
567{
568 kmem_cache_destroy(ceph_inode_cachep);
569 kmem_cache_destroy(ceph_cap_cachep);
570 kmem_cache_destroy(ceph_dentry_cachep);
571 kmem_cache_destroy(ceph_file_cachep);
572}
573
574
575/*
576 * ceph_umount_begin - initiate forced umount. Tear down down the
577 * mount, skipping steps that may hang while waiting for server(s).
578 */
579static void ceph_umount_begin(struct super_block *sb)
580{
581 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
582
583 dout("ceph_umount_begin - starting forced umount\n");
584 if (!fsc)
585 return;
586 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
587 return;
588}
589
590static const struct super_operations ceph_super_ops = {
591 .alloc_inode = ceph_alloc_inode,
592 .destroy_inode = ceph_destroy_inode,
593 .write_inode = ceph_write_inode,
594 .sync_fs = ceph_sync_fs,
595 .put_super = ceph_put_super,
596 .show_options = ceph_show_options,
597 .statfs = ceph_statfs,
598 .umount_begin = ceph_umount_begin,
599};
600
601/*
602 * Bootstrap mount by opening the root directory. Note the mount
603 * @started time from caller, and time out if this takes too long.
604 */
605static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
606 const char *path,
607 unsigned long started)
608{
609 struct ceph_mds_client *mdsc = fsc->mdsc;
610 struct ceph_mds_request *req = NULL;
611 int err;
612 struct dentry *root;
613
614 /* open dir */
615 dout("open_root_inode opening '%s'\n", path);
616 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
617 if (IS_ERR(req))
618 return ERR_CAST(req);
619 req->r_path1 = kstrdup(path, GFP_NOFS);
620 req->r_ino1.ino = CEPH_INO_ROOT;
621 req->r_ino1.snap = CEPH_NOSNAP;
622 req->r_started = started;
623 req->r_timeout = fsc->client->options->mount_timeout * HZ;
624 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
625 req->r_num_caps = 2;
626 err = ceph_mdsc_do_request(mdsc, NULL, req);
627 if (err == 0) {
628 dout("open_root_inode success\n");
629 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
630 fsc->sb->s_root == NULL)
631 root = d_alloc_root(req->r_target_inode);
632 else
633 root = d_obtain_alias(req->r_target_inode);
634 req->r_target_inode = NULL;
635 dout("open_root_inode success, root dentry is %p\n", root);
636 } else {
637 root = ERR_PTR(err);
638 }
639 ceph_mdsc_put_request(req);
640 return root;
641}
642
643
644
645
646/*
647 * mount: join the ceph cluster, and open root directory.
648 */
649static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
650 const char *path)
651{
652 int err;
653 unsigned long started = jiffies; /* note the start time */
654 struct dentry *root;
655 int first = 0; /* first vfsmount for this super_block */
656
657 dout("mount start\n");
658 mutex_lock(&fsc->client->mount_mutex);
659
660 err = __ceph_open_session(fsc->client, started);
661 if (err < 0)
662 goto out;
663
664 dout("mount opening root\n");
665 root = open_root_dentry(fsc, "", started);
666 if (IS_ERR(root)) {
667 err = PTR_ERR(root);
668 goto out;
669 }
670 if (fsc->sb->s_root) {
671 dput(root);
672 } else {
673 fsc->sb->s_root = root;
674 first = 1;
675
676 err = ceph_fs_debugfs_init(fsc);
677 if (err < 0)
678 goto fail;
679 }
680
681 if (path[0] == 0) {
682 dget(root);
683 } else {
684 dout("mount opening base mountpoint\n");
685 root = open_root_dentry(fsc, path, started);
686 if (IS_ERR(root)) {
687 err = PTR_ERR(root);
688 goto fail;
689 }
690 }
691
692 fsc->mount_state = CEPH_MOUNT_MOUNTED;
693 dout("mount success\n");
694 mutex_unlock(&fsc->client->mount_mutex);
695 return root;
696
697out:
698 mutex_unlock(&fsc->client->mount_mutex);
699 return ERR_PTR(err);
700
701fail:
702 if (first) {
703 dput(fsc->sb->s_root);
704 fsc->sb->s_root = NULL;
705 }
706 goto out;
707}
708
709static int ceph_set_super(struct super_block *s, void *data)
710{
711 struct ceph_fs_client *fsc = data;
712 int ret;
713
714 dout("set_super %p data %p\n", s, data);
715
716 s->s_flags = fsc->mount_options->sb_flags;
717 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
718
719 s->s_fs_info = fsc;
720 fsc->sb = s;
721
722 s->s_op = &ceph_super_ops;
723 s->s_export_op = &ceph_export_ops;
724
725 s->s_time_gran = 1000; /* 1000 ns == 1 us */
726
727 ret = set_anon_super(s, NULL); /* what is that second arg for? */
728 if (ret != 0)
729 goto fail;
730
731 return ret;
732
733fail:
734 s->s_fs_info = NULL;
735 fsc->sb = NULL;
736 return ret;
737}
738
739/*
740 * share superblock if same fs AND options
741 */
742static int ceph_compare_super(struct super_block *sb, void *data)
743{
744 struct ceph_fs_client *new = data;
745 struct ceph_mount_options *fsopt = new->mount_options;
746 struct ceph_options *opt = new->client->options;
747 struct ceph_fs_client *other = ceph_sb_to_client(sb);
748
749 dout("ceph_compare_super %p\n", sb);
750
751 if (compare_mount_options(fsopt, opt, other)) {
752 dout("monitor(s)/mount options don't match\n");
753 return 0;
754 }
755 if ((opt->flags & CEPH_OPT_FSID) &&
756 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
757 dout("fsid doesn't match\n");
758 return 0;
759 }
760 if (fsopt->sb_flags != other->mount_options->sb_flags) {
761 dout("flags differ\n");
762 return 0;
763 }
764 return 1;
765}
766
767/*
768 * construct our own bdi so we can control readahead, etc.
769 */
770static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
771
772static int ceph_register_bdi(struct super_block *sb,
773 struct ceph_fs_client *fsc)
774{
775 int err;
776
777 /* set ra_pages based on rsize mount option? */
778 if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE)
779 fsc->backing_dev_info.ra_pages =
780 (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1)
781 >> PAGE_SHIFT;
782 else
783 fsc->backing_dev_info.ra_pages =
784 default_backing_dev_info.ra_pages;
785
786 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
787 atomic_long_inc_return(&bdi_seq));
788 if (!err)
789 sb->s_bdi = &fsc->backing_dev_info;
790 return err;
791}
792
793static struct dentry *ceph_mount(struct file_system_type *fs_type,
794 int flags, const char *dev_name, void *data)
795{
796 struct super_block *sb;
797 struct ceph_fs_client *fsc;
798 struct dentry *res;
799 int err;
800 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
801 const char *path = NULL;
802 struct ceph_mount_options *fsopt = NULL;
803 struct ceph_options *opt = NULL;
804
805 dout("ceph_mount\n");
806 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
807 if (err < 0) {
808 res = ERR_PTR(err);
809 goto out_final;
810 }
811
812 /* create client (which we may/may not use) */
813 fsc = create_fs_client(fsopt, opt);
814 if (IS_ERR(fsc)) {
815 res = ERR_CAST(fsc);
816 destroy_mount_options(fsopt);
817 ceph_destroy_options(opt);
818 goto out_final;
819 }
820
821 err = ceph_mdsc_init(fsc);
822 if (err < 0) {
823 res = ERR_PTR(err);
824 goto out;
825 }
826
827 if (ceph_test_opt(fsc->client, NOSHARE))
828 compare_super = NULL;
829 sb = sget(fs_type, compare_super, ceph_set_super, fsc);
830 if (IS_ERR(sb)) {
831 res = ERR_CAST(sb);
832 goto out;
833 }
834
835 if (ceph_sb_to_client(sb) != fsc) {
836 ceph_mdsc_destroy(fsc);
837 destroy_fs_client(fsc);
838 fsc = ceph_sb_to_client(sb);
839 dout("get_sb got existing client %p\n", fsc);
840 } else {
841 dout("get_sb using new client %p\n", fsc);
842 err = ceph_register_bdi(sb, fsc);
843 if (err < 0) {
844 res = ERR_PTR(err);
845 goto out_splat;
846 }
847 }
848
849 res = ceph_real_mount(fsc, path);
850 if (IS_ERR(res))
851 goto out_splat;
852 dout("root %p inode %p ino %llx.%llx\n", res,
853 res->d_inode, ceph_vinop(res->d_inode));
854 return res;
855
856out_splat:
857 ceph_mdsc_close_sessions(fsc->mdsc);
858 deactivate_locked_super(sb);
859 goto out_final;
860
861out:
862 ceph_mdsc_destroy(fsc);
863 destroy_fs_client(fsc);
864out_final:
865 dout("ceph_mount fail %ld\n", PTR_ERR(res));
866 return res;
867}
868
869static void ceph_kill_sb(struct super_block *s)
870{
871 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
872 dout("kill_sb %p\n", s);
873 ceph_mdsc_pre_umount(fsc->mdsc);
874 kill_anon_super(s); /* will call put_super after sb is r/o */
875 ceph_mdsc_destroy(fsc);
876 destroy_fs_client(fsc);
877}
878
879static struct file_system_type ceph_fs_type = {
880 .owner = THIS_MODULE,
881 .name = "ceph",
882 .mount = ceph_mount,
883 .kill_sb = ceph_kill_sb,
884 .fs_flags = FS_RENAME_DOES_D_MOVE,
885};
886
887#define _STRINGIFY(x) #x
888#define STRINGIFY(x) _STRINGIFY(x)
889
890static int __init init_ceph(void)
891{
892 int ret = init_caches();
893 if (ret)
894 goto out;
895
896 ret = register_filesystem(&ceph_fs_type);
897 if (ret)
898 goto out_icache;
899
900 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
901
902 return 0;
903
904out_icache:
905 destroy_caches();
906out:
907 return ret;
908}
909
910static void __exit exit_ceph(void)
911{
912 dout("exit_ceph\n");
913 unregister_filesystem(&ceph_fs_type);
914 destroy_caches();
915}
916
917module_init(init_ceph);
918module_exit(exit_ceph);
919
920MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
921MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
922MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
923MODULE_DESCRIPTION("Ceph filesystem for Linux");
924MODULE_LICENSE("GPL");
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#include "cache.h"
21
22#include <linux/ceph/ceph_features.h>
23#include <linux/ceph/decode.h>
24#include <linux/ceph/mon_client.h>
25#include <linux/ceph/auth.h>
26#include <linux/ceph/debugfs.h>
27
28/*
29 * Ceph superblock operations
30 *
31 * Handle the basics of mounting, unmounting.
32 */
33
34/*
35 * super ops
36 */
37static void ceph_put_super(struct super_block *s)
38{
39 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
40
41 dout("put_super\n");
42 ceph_mdsc_close_sessions(fsc->mdsc);
43}
44
45static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
46{
47 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
48 struct ceph_monmap *monmap = fsc->client->monc.monmap;
49 struct ceph_statfs st;
50 u64 fsid;
51 int err;
52
53 dout("statfs\n");
54 err = ceph_monc_do_statfs(&fsc->client->monc, &st);
55 if (err < 0)
56 return err;
57
58 /* fill in kstatfs */
59 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
60
61 /*
62 * express utilization in terms of large blocks to avoid
63 * overflow on 32-bit machines.
64 *
65 * NOTE: for the time being, we make bsize == frsize to humor
66 * not-yet-ancient versions of glibc that are broken.
67 * Someday, we will probably want to report a real block
68 * size... whatever that may mean for a network file system!
69 */
70 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
71 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
72 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
73 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
74 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
75
76 buf->f_files = le64_to_cpu(st.num_objects);
77 buf->f_ffree = -1;
78 buf->f_namelen = NAME_MAX;
79
80 /* leave fsid little-endian, regardless of host endianness */
81 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
82 buf->f_fsid.val[0] = fsid & 0xffffffff;
83 buf->f_fsid.val[1] = fsid >> 32;
84
85 return 0;
86}
87
88
89static int ceph_sync_fs(struct super_block *sb, int wait)
90{
91 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
92
93 if (!wait) {
94 dout("sync_fs (non-blocking)\n");
95 ceph_flush_dirty_caps(fsc->mdsc);
96 dout("sync_fs (non-blocking) done\n");
97 return 0;
98 }
99
100 dout("sync_fs (blocking)\n");
101 ceph_osdc_sync(&fsc->client->osdc);
102 ceph_mdsc_sync(fsc->mdsc);
103 dout("sync_fs (blocking) done\n");
104 return 0;
105}
106
107/*
108 * mount options
109 */
110enum {
111 Opt_wsize,
112 Opt_rsize,
113 Opt_rasize,
114 Opt_caps_wanted_delay_min,
115 Opt_caps_wanted_delay_max,
116 Opt_cap_release_safety,
117 Opt_readdir_max_entries,
118 Opt_readdir_max_bytes,
119 Opt_congestion_kb,
120 Opt_last_int,
121 /* int args above */
122 Opt_snapdirname,
123 Opt_mds_namespace,
124 Opt_last_string,
125 /* string args above */
126 Opt_dirstat,
127 Opt_nodirstat,
128 Opt_rbytes,
129 Opt_norbytes,
130 Opt_asyncreaddir,
131 Opt_noasyncreaddir,
132 Opt_dcache,
133 Opt_nodcache,
134 Opt_ino32,
135 Opt_noino32,
136 Opt_fscache,
137 Opt_nofscache,
138 Opt_poolperm,
139 Opt_nopoolperm,
140 Opt_require_active_mds,
141 Opt_norequire_active_mds,
142#ifdef CONFIG_CEPH_FS_POSIX_ACL
143 Opt_acl,
144#endif
145 Opt_noacl,
146};
147
148static match_table_t fsopt_tokens = {
149 {Opt_wsize, "wsize=%d"},
150 {Opt_rsize, "rsize=%d"},
151 {Opt_rasize, "rasize=%d"},
152 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
153 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
154 {Opt_cap_release_safety, "cap_release_safety=%d"},
155 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
156 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
157 {Opt_congestion_kb, "write_congestion_kb=%d"},
158 /* int args above */
159 {Opt_snapdirname, "snapdirname=%s"},
160 {Opt_mds_namespace, "mds_namespace=%s"},
161 /* string args above */
162 {Opt_dirstat, "dirstat"},
163 {Opt_nodirstat, "nodirstat"},
164 {Opt_rbytes, "rbytes"},
165 {Opt_norbytes, "norbytes"},
166 {Opt_asyncreaddir, "asyncreaddir"},
167 {Opt_noasyncreaddir, "noasyncreaddir"},
168 {Opt_dcache, "dcache"},
169 {Opt_nodcache, "nodcache"},
170 {Opt_ino32, "ino32"},
171 {Opt_noino32, "noino32"},
172 {Opt_fscache, "fsc"},
173 {Opt_nofscache, "nofsc"},
174 {Opt_poolperm, "poolperm"},
175 {Opt_nopoolperm, "nopoolperm"},
176 {Opt_require_active_mds, "require_active_mds"},
177 {Opt_norequire_active_mds, "norequire_active_mds"},
178#ifdef CONFIG_CEPH_FS_POSIX_ACL
179 {Opt_acl, "acl"},
180#endif
181 {Opt_noacl, "noacl"},
182 {-1, NULL}
183};
184
185static int parse_fsopt_token(char *c, void *private)
186{
187 struct ceph_mount_options *fsopt = private;
188 substring_t argstr[MAX_OPT_ARGS];
189 int token, intval, ret;
190
191 token = match_token((char *)c, fsopt_tokens, argstr);
192 if (token < 0)
193 return -EINVAL;
194
195 if (token < Opt_last_int) {
196 ret = match_int(&argstr[0], &intval);
197 if (ret < 0) {
198 pr_err("bad mount option arg (not int) "
199 "at '%s'\n", c);
200 return ret;
201 }
202 dout("got int token %d val %d\n", token, intval);
203 } else if (token > Opt_last_int && token < Opt_last_string) {
204 dout("got string token %d val %s\n", token,
205 argstr[0].from);
206 } else {
207 dout("got token %d\n", token);
208 }
209
210 switch (token) {
211 case Opt_snapdirname:
212 kfree(fsopt->snapdir_name);
213 fsopt->snapdir_name = kstrndup(argstr[0].from,
214 argstr[0].to-argstr[0].from,
215 GFP_KERNEL);
216 if (!fsopt->snapdir_name)
217 return -ENOMEM;
218 break;
219 case Opt_mds_namespace:
220 fsopt->mds_namespace = kstrndup(argstr[0].from,
221 argstr[0].to-argstr[0].from,
222 GFP_KERNEL);
223 if (!fsopt->mds_namespace)
224 return -ENOMEM;
225 break;
226 /* misc */
227 case Opt_wsize:
228 fsopt->wsize = intval;
229 break;
230 case Opt_rsize:
231 fsopt->rsize = intval;
232 break;
233 case Opt_rasize:
234 fsopt->rasize = intval;
235 break;
236 case Opt_caps_wanted_delay_min:
237 fsopt->caps_wanted_delay_min = intval;
238 break;
239 case Opt_caps_wanted_delay_max:
240 fsopt->caps_wanted_delay_max = intval;
241 break;
242 case Opt_readdir_max_entries:
243 fsopt->max_readdir = intval;
244 break;
245 case Opt_readdir_max_bytes:
246 fsopt->max_readdir_bytes = intval;
247 break;
248 case Opt_congestion_kb:
249 fsopt->congestion_kb = intval;
250 break;
251 case Opt_dirstat:
252 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
253 break;
254 case Opt_nodirstat:
255 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
256 break;
257 case Opt_rbytes:
258 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
259 break;
260 case Opt_norbytes:
261 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
262 break;
263 case Opt_asyncreaddir:
264 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
265 break;
266 case Opt_noasyncreaddir:
267 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
268 break;
269 case Opt_dcache:
270 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
271 break;
272 case Opt_nodcache:
273 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
274 break;
275 case Opt_ino32:
276 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
277 break;
278 case Opt_noino32:
279 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
280 break;
281 case Opt_fscache:
282 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
283 break;
284 case Opt_nofscache:
285 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
286 break;
287 case Opt_poolperm:
288 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
289 printk ("pool perm");
290 break;
291 case Opt_nopoolperm:
292 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
293 break;
294 case Opt_require_active_mds:
295 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
296 break;
297 case Opt_norequire_active_mds:
298 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
299 break;
300#ifdef CONFIG_CEPH_FS_POSIX_ACL
301 case Opt_acl:
302 fsopt->sb_flags |= MS_POSIXACL;
303 break;
304#endif
305 case Opt_noacl:
306 fsopt->sb_flags &= ~MS_POSIXACL;
307 break;
308 default:
309 BUG_ON(token);
310 }
311 return 0;
312}
313
314static void destroy_mount_options(struct ceph_mount_options *args)
315{
316 dout("destroy_mount_options %p\n", args);
317 kfree(args->snapdir_name);
318 kfree(args->mds_namespace);
319 kfree(args->server_path);
320 kfree(args);
321}
322
323static int strcmp_null(const char *s1, const char *s2)
324{
325 if (!s1 && !s2)
326 return 0;
327 if (s1 && !s2)
328 return -1;
329 if (!s1 && s2)
330 return 1;
331 return strcmp(s1, s2);
332}
333
334static int compare_mount_options(struct ceph_mount_options *new_fsopt,
335 struct ceph_options *new_opt,
336 struct ceph_fs_client *fsc)
337{
338 struct ceph_mount_options *fsopt1 = new_fsopt;
339 struct ceph_mount_options *fsopt2 = fsc->mount_options;
340 int ofs = offsetof(struct ceph_mount_options, snapdir_name);
341 int ret;
342
343 ret = memcmp(fsopt1, fsopt2, ofs);
344 if (ret)
345 return ret;
346
347 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
348 if (ret)
349 return ret;
350 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
351 if (ret)
352 return ret;
353
354 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
355 if (ret)
356 return ret;
357
358 return ceph_compare_options(new_opt, fsc->client);
359}
360
361static int parse_mount_options(struct ceph_mount_options **pfsopt,
362 struct ceph_options **popt,
363 int flags, char *options,
364 const char *dev_name)
365{
366 struct ceph_mount_options *fsopt;
367 const char *dev_name_end;
368 int err;
369
370 if (!dev_name || !*dev_name)
371 return -EINVAL;
372
373 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
374 if (!fsopt)
375 return -ENOMEM;
376
377 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
378
379 fsopt->sb_flags = flags;
380 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
381
382 fsopt->rsize = CEPH_RSIZE_DEFAULT;
383 fsopt->rasize = CEPH_RASIZE_DEFAULT;
384 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
385 if (!fsopt->snapdir_name) {
386 err = -ENOMEM;
387 goto out;
388 }
389
390 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
391 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
392 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
393 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
394 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
395 fsopt->congestion_kb = default_congestion_kb();
396
397 /*
398 * Distinguish the server list from the path in "dev_name".
399 * Internally we do not include the leading '/' in the path.
400 *
401 * "dev_name" will look like:
402 * <server_spec>[,<server_spec>...]:[<path>]
403 * where
404 * <server_spec> is <ip>[:<port>]
405 * <path> is optional, but if present must begin with '/'
406 */
407 dev_name_end = strchr(dev_name, '/');
408 if (dev_name_end) {
409 if (strlen(dev_name_end) > 1) {
410 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
411 if (!fsopt->server_path) {
412 err = -ENOMEM;
413 goto out;
414 }
415 }
416 } else {
417 dev_name_end = dev_name + strlen(dev_name);
418 }
419 err = -EINVAL;
420 dev_name_end--; /* back up to ':' separator */
421 if (dev_name_end < dev_name || *dev_name_end != ':') {
422 pr_err("device name is missing path (no : separator in %s)\n",
423 dev_name);
424 goto out;
425 }
426 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
427 if (fsopt->server_path)
428 dout("server path '%s'\n", fsopt->server_path);
429
430 *popt = ceph_parse_options(options, dev_name, dev_name_end,
431 parse_fsopt_token, (void *)fsopt);
432 if (IS_ERR(*popt)) {
433 err = PTR_ERR(*popt);
434 goto out;
435 }
436
437 /* success */
438 *pfsopt = fsopt;
439 return 0;
440
441out:
442 destroy_mount_options(fsopt);
443 return err;
444}
445
446/**
447 * ceph_show_options - Show mount options in /proc/mounts
448 * @m: seq_file to write to
449 * @root: root of that (sub)tree
450 */
451static int ceph_show_options(struct seq_file *m, struct dentry *root)
452{
453 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
454 struct ceph_mount_options *fsopt = fsc->mount_options;
455 size_t pos;
456 int ret;
457
458 /* a comma between MNT/MS and client options */
459 seq_putc(m, ',');
460 pos = m->count;
461
462 ret = ceph_print_client_options(m, fsc->client);
463 if (ret)
464 return ret;
465
466 /* retract our comma if no client options */
467 if (m->count == pos)
468 m->count--;
469
470 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
471 seq_puts(m, ",dirstat");
472 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
473 seq_puts(m, ",rbytes");
474 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
475 seq_puts(m, ",noasyncreaddir");
476 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
477 seq_puts(m, ",nodcache");
478 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
479 seq_puts(m, ",fsc");
480 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
481 seq_puts(m, ",nopoolperm");
482
483#ifdef CONFIG_CEPH_FS_POSIX_ACL
484 if (fsopt->sb_flags & MS_POSIXACL)
485 seq_puts(m, ",acl");
486 else
487 seq_puts(m, ",noacl");
488#endif
489
490 if (fsopt->mds_namespace)
491 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
492 if (fsopt->wsize)
493 seq_printf(m, ",wsize=%d", fsopt->wsize);
494 if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
495 seq_printf(m, ",rsize=%d", fsopt->rsize);
496 if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
497 seq_printf(m, ",rasize=%d", fsopt->rasize);
498 if (fsopt->congestion_kb != default_congestion_kb())
499 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
500 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
501 seq_printf(m, ",caps_wanted_delay_min=%d",
502 fsopt->caps_wanted_delay_min);
503 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
504 seq_printf(m, ",caps_wanted_delay_max=%d",
505 fsopt->caps_wanted_delay_max);
506 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
507 seq_printf(m, ",cap_release_safety=%d",
508 fsopt->cap_release_safety);
509 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
510 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
511 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
512 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
513 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
514 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
515
516 return 0;
517}
518
519/*
520 * handle any mon messages the standard library doesn't understand.
521 * return error if we don't either.
522 */
523static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
524{
525 struct ceph_fs_client *fsc = client->private;
526 int type = le16_to_cpu(msg->hdr.type);
527
528 switch (type) {
529 case CEPH_MSG_MDS_MAP:
530 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
531 return 0;
532 case CEPH_MSG_FS_MAP_USER:
533 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
534 return 0;
535 default:
536 return -1;
537 }
538}
539
540/*
541 * create a new fs client
542 */
543static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
544 struct ceph_options *opt)
545{
546 struct ceph_fs_client *fsc;
547 const u64 supported_features =
548 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
549 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
550 const u64 required_features = 0;
551 int page_count;
552 size_t size;
553 int err = -ENOMEM;
554
555 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
556 if (!fsc)
557 return ERR_PTR(-ENOMEM);
558
559 fsc->client = ceph_create_client(opt, fsc, supported_features,
560 required_features);
561 if (IS_ERR(fsc->client)) {
562 err = PTR_ERR(fsc->client);
563 goto fail;
564 }
565 fsc->client->extra_mon_dispatch = extra_mon_dispatch;
566
567 if (fsopt->mds_namespace == NULL) {
568 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
569 0, true);
570 } else {
571 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
572 0, false);
573 }
574
575 fsc->mount_options = fsopt;
576
577 fsc->sb = NULL;
578 fsc->mount_state = CEPH_MOUNT_MOUNTING;
579
580 atomic_long_set(&fsc->writeback_count, 0);
581
582 err = bdi_init(&fsc->backing_dev_info);
583 if (err < 0)
584 goto fail_client;
585
586 err = -ENOMEM;
587 /*
588 * The number of concurrent works can be high but they don't need
589 * to be processed in parallel, limit concurrency.
590 */
591 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
592 if (fsc->wb_wq == NULL)
593 goto fail_bdi;
594 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
595 if (fsc->pg_inv_wq == NULL)
596 goto fail_wb_wq;
597 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
598 if (fsc->trunc_wq == NULL)
599 goto fail_pg_inv_wq;
600
601 /* set up mempools */
602 err = -ENOMEM;
603 page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
604 size = sizeof (struct page *) * (page_count ? page_count : 1);
605 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
606 if (!fsc->wb_pagevec_pool)
607 goto fail_trunc_wq;
608
609 /* setup fscache */
610 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
611 (ceph_fscache_register_fs(fsc) != 0))
612 goto fail_fscache;
613
614 /* caps */
615 fsc->min_caps = fsopt->max_readdir;
616
617 return fsc;
618
619fail_fscache:
620 ceph_fscache_unregister_fs(fsc);
621fail_trunc_wq:
622 destroy_workqueue(fsc->trunc_wq);
623fail_pg_inv_wq:
624 destroy_workqueue(fsc->pg_inv_wq);
625fail_wb_wq:
626 destroy_workqueue(fsc->wb_wq);
627fail_bdi:
628 bdi_destroy(&fsc->backing_dev_info);
629fail_client:
630 ceph_destroy_client(fsc->client);
631fail:
632 kfree(fsc);
633 return ERR_PTR(err);
634}
635
636static void destroy_fs_client(struct ceph_fs_client *fsc)
637{
638 dout("destroy_fs_client %p\n", fsc);
639
640 ceph_fscache_unregister_fs(fsc);
641
642 destroy_workqueue(fsc->wb_wq);
643 destroy_workqueue(fsc->pg_inv_wq);
644 destroy_workqueue(fsc->trunc_wq);
645
646 bdi_destroy(&fsc->backing_dev_info);
647
648 mempool_destroy(fsc->wb_pagevec_pool);
649
650 destroy_mount_options(fsc->mount_options);
651
652 ceph_fs_debugfs_cleanup(fsc);
653
654 ceph_destroy_client(fsc->client);
655
656 kfree(fsc);
657 dout("destroy_fs_client %p done\n", fsc);
658}
659
660/*
661 * caches
662 */
663struct kmem_cache *ceph_inode_cachep;
664struct kmem_cache *ceph_cap_cachep;
665struct kmem_cache *ceph_cap_flush_cachep;
666struct kmem_cache *ceph_dentry_cachep;
667struct kmem_cache *ceph_file_cachep;
668
669static void ceph_inode_init_once(void *foo)
670{
671 struct ceph_inode_info *ci = foo;
672 inode_init_once(&ci->vfs_inode);
673}
674
675static int __init init_caches(void)
676{
677 int error = -ENOMEM;
678
679 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
680 sizeof(struct ceph_inode_info),
681 __alignof__(struct ceph_inode_info),
682 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
683 SLAB_ACCOUNT, ceph_inode_init_once);
684 if (ceph_inode_cachep == NULL)
685 return -ENOMEM;
686
687 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
688 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
689 if (ceph_cap_cachep == NULL)
690 goto bad_cap;
691 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
692 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
693 if (ceph_cap_flush_cachep == NULL)
694 goto bad_cap_flush;
695
696 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
697 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
698 if (ceph_dentry_cachep == NULL)
699 goto bad_dentry;
700
701 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
702
703 if (ceph_file_cachep == NULL)
704 goto bad_file;
705
706 if ((error = ceph_fscache_register()))
707 goto bad_file;
708
709 return 0;
710bad_file:
711 kmem_cache_destroy(ceph_dentry_cachep);
712bad_dentry:
713 kmem_cache_destroy(ceph_cap_flush_cachep);
714bad_cap_flush:
715 kmem_cache_destroy(ceph_cap_cachep);
716bad_cap:
717 kmem_cache_destroy(ceph_inode_cachep);
718 return error;
719}
720
721static void destroy_caches(void)
722{
723 /*
724 * Make sure all delayed rcu free inodes are flushed before we
725 * destroy cache.
726 */
727 rcu_barrier();
728
729 kmem_cache_destroy(ceph_inode_cachep);
730 kmem_cache_destroy(ceph_cap_cachep);
731 kmem_cache_destroy(ceph_cap_flush_cachep);
732 kmem_cache_destroy(ceph_dentry_cachep);
733 kmem_cache_destroy(ceph_file_cachep);
734
735 ceph_fscache_unregister();
736}
737
738
739/*
740 * ceph_umount_begin - initiate forced umount. Tear down down the
741 * mount, skipping steps that may hang while waiting for server(s).
742 */
743static void ceph_umount_begin(struct super_block *sb)
744{
745 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
746
747 dout("ceph_umount_begin - starting forced umount\n");
748 if (!fsc)
749 return;
750 fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
751 ceph_mdsc_force_umount(fsc->mdsc);
752 return;
753}
754
755static const struct super_operations ceph_super_ops = {
756 .alloc_inode = ceph_alloc_inode,
757 .destroy_inode = ceph_destroy_inode,
758 .write_inode = ceph_write_inode,
759 .drop_inode = ceph_drop_inode,
760 .evict_inode = ceph_evict_inode,
761 .sync_fs = ceph_sync_fs,
762 .put_super = ceph_put_super,
763 .show_options = ceph_show_options,
764 .statfs = ceph_statfs,
765 .umount_begin = ceph_umount_begin,
766};
767
768/*
769 * Bootstrap mount by opening the root directory. Note the mount
770 * @started time from caller, and time out if this takes too long.
771 */
772static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
773 const char *path,
774 unsigned long started)
775{
776 struct ceph_mds_client *mdsc = fsc->mdsc;
777 struct ceph_mds_request *req = NULL;
778 int err;
779 struct dentry *root;
780
781 /* open dir */
782 dout("open_root_inode opening '%s'\n", path);
783 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
784 if (IS_ERR(req))
785 return ERR_CAST(req);
786 req->r_path1 = kstrdup(path, GFP_NOFS);
787 if (!req->r_path1) {
788 root = ERR_PTR(-ENOMEM);
789 goto out;
790 }
791
792 req->r_ino1.ino = CEPH_INO_ROOT;
793 req->r_ino1.snap = CEPH_NOSNAP;
794 req->r_started = started;
795 req->r_timeout = fsc->client->options->mount_timeout;
796 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
797 req->r_num_caps = 2;
798 err = ceph_mdsc_do_request(mdsc, NULL, req);
799 if (err == 0) {
800 struct inode *inode = req->r_target_inode;
801 req->r_target_inode = NULL;
802 dout("open_root_inode success\n");
803 root = d_make_root(inode);
804 if (!root) {
805 root = ERR_PTR(-ENOMEM);
806 goto out;
807 }
808 dout("open_root_inode success, root dentry is %p\n", root);
809 } else {
810 root = ERR_PTR(err);
811 }
812out:
813 ceph_mdsc_put_request(req);
814 return root;
815}
816
817
818
819
820/*
821 * mount: join the ceph cluster, and open root directory.
822 */
823static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
824{
825 int err;
826 unsigned long started = jiffies; /* note the start time */
827 struct dentry *root;
828 int first = 0; /* first vfsmount for this super_block */
829
830 dout("mount start %p\n", fsc);
831 mutex_lock(&fsc->client->mount_mutex);
832
833 if (!fsc->sb->s_root) {
834 const char *path;
835 err = __ceph_open_session(fsc->client, started);
836 if (err < 0)
837 goto out;
838
839 if (!fsc->mount_options->server_path) {
840 path = "";
841 dout("mount opening path \\t\n");
842 } else {
843 path = fsc->mount_options->server_path + 1;
844 dout("mount opening path %s\n", path);
845 }
846 root = open_root_dentry(fsc, path, started);
847 if (IS_ERR(root)) {
848 err = PTR_ERR(root);
849 goto out;
850 }
851 fsc->sb->s_root = dget(root);
852 first = 1;
853
854 err = ceph_fs_debugfs_init(fsc);
855 if (err < 0)
856 goto fail;
857 } else {
858 root = dget(fsc->sb->s_root);
859 }
860
861 fsc->mount_state = CEPH_MOUNT_MOUNTED;
862 dout("mount success\n");
863 mutex_unlock(&fsc->client->mount_mutex);
864 return root;
865
866fail:
867 if (first) {
868 dput(fsc->sb->s_root);
869 fsc->sb->s_root = NULL;
870 }
871out:
872 mutex_unlock(&fsc->client->mount_mutex);
873 return ERR_PTR(err);
874}
875
876static int ceph_set_super(struct super_block *s, void *data)
877{
878 struct ceph_fs_client *fsc = data;
879 int ret;
880
881 dout("set_super %p data %p\n", s, data);
882
883 s->s_flags = fsc->mount_options->sb_flags;
884 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
885
886 s->s_xattr = ceph_xattr_handlers;
887 s->s_fs_info = fsc;
888 fsc->sb = s;
889
890 s->s_op = &ceph_super_ops;
891 s->s_d_op = &ceph_dentry_ops;
892 s->s_export_op = &ceph_export_ops;
893
894 s->s_time_gran = 1000; /* 1000 ns == 1 us */
895
896 ret = set_anon_super(s, NULL); /* what is that second arg for? */
897 if (ret != 0)
898 goto fail;
899
900 return ret;
901
902fail:
903 s->s_fs_info = NULL;
904 fsc->sb = NULL;
905 return ret;
906}
907
908/*
909 * share superblock if same fs AND options
910 */
911static int ceph_compare_super(struct super_block *sb, void *data)
912{
913 struct ceph_fs_client *new = data;
914 struct ceph_mount_options *fsopt = new->mount_options;
915 struct ceph_options *opt = new->client->options;
916 struct ceph_fs_client *other = ceph_sb_to_client(sb);
917
918 dout("ceph_compare_super %p\n", sb);
919
920 if (compare_mount_options(fsopt, opt, other)) {
921 dout("monitor(s)/mount options don't match\n");
922 return 0;
923 }
924 if ((opt->flags & CEPH_OPT_FSID) &&
925 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
926 dout("fsid doesn't match\n");
927 return 0;
928 }
929 if (fsopt->sb_flags != other->mount_options->sb_flags) {
930 dout("flags differ\n");
931 return 0;
932 }
933 return 1;
934}
935
936/*
937 * construct our own bdi so we can control readahead, etc.
938 */
939static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
940
941static int ceph_register_bdi(struct super_block *sb,
942 struct ceph_fs_client *fsc)
943{
944 int err;
945
946 /* set ra_pages based on rasize mount option? */
947 if (fsc->mount_options->rasize >= PAGE_SIZE)
948 fsc->backing_dev_info.ra_pages =
949 (fsc->mount_options->rasize + PAGE_SIZE - 1)
950 >> PAGE_SHIFT;
951 else
952 fsc->backing_dev_info.ra_pages =
953 VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
954
955 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
956 atomic_long_inc_return(&bdi_seq));
957 if (!err)
958 sb->s_bdi = &fsc->backing_dev_info;
959 return err;
960}
961
962static struct dentry *ceph_mount(struct file_system_type *fs_type,
963 int flags, const char *dev_name, void *data)
964{
965 struct super_block *sb;
966 struct ceph_fs_client *fsc;
967 struct dentry *res;
968 int err;
969 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
970 struct ceph_mount_options *fsopt = NULL;
971 struct ceph_options *opt = NULL;
972
973 dout("ceph_mount\n");
974
975#ifdef CONFIG_CEPH_FS_POSIX_ACL
976 flags |= MS_POSIXACL;
977#endif
978 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
979 if (err < 0) {
980 res = ERR_PTR(err);
981 goto out_final;
982 }
983
984 /* create client (which we may/may not use) */
985 fsc = create_fs_client(fsopt, opt);
986 if (IS_ERR(fsc)) {
987 res = ERR_CAST(fsc);
988 destroy_mount_options(fsopt);
989 ceph_destroy_options(opt);
990 goto out_final;
991 }
992
993 err = ceph_mdsc_init(fsc);
994 if (err < 0) {
995 res = ERR_PTR(err);
996 goto out;
997 }
998
999 if (ceph_test_opt(fsc->client, NOSHARE))
1000 compare_super = NULL;
1001 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1002 if (IS_ERR(sb)) {
1003 res = ERR_CAST(sb);
1004 goto out;
1005 }
1006
1007 if (ceph_sb_to_client(sb) != fsc) {
1008 ceph_mdsc_destroy(fsc);
1009 destroy_fs_client(fsc);
1010 fsc = ceph_sb_to_client(sb);
1011 dout("get_sb got existing client %p\n", fsc);
1012 } else {
1013 dout("get_sb using new client %p\n", fsc);
1014 err = ceph_register_bdi(sb, fsc);
1015 if (err < 0) {
1016 res = ERR_PTR(err);
1017 goto out_splat;
1018 }
1019 }
1020
1021 res = ceph_real_mount(fsc);
1022 if (IS_ERR(res))
1023 goto out_splat;
1024 dout("root %p inode %p ino %llx.%llx\n", res,
1025 d_inode(res), ceph_vinop(d_inode(res)));
1026 return res;
1027
1028out_splat:
1029 ceph_mdsc_close_sessions(fsc->mdsc);
1030 deactivate_locked_super(sb);
1031 goto out_final;
1032
1033out:
1034 ceph_mdsc_destroy(fsc);
1035 destroy_fs_client(fsc);
1036out_final:
1037 dout("ceph_mount fail %ld\n", PTR_ERR(res));
1038 return res;
1039}
1040
1041static void ceph_kill_sb(struct super_block *s)
1042{
1043 struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1044 dev_t dev = s->s_dev;
1045
1046 dout("kill_sb %p\n", s);
1047
1048 ceph_mdsc_pre_umount(fsc->mdsc);
1049 generic_shutdown_super(s);
1050 ceph_mdsc_destroy(fsc);
1051
1052 destroy_fs_client(fsc);
1053 free_anon_bdev(dev);
1054}
1055
1056static struct file_system_type ceph_fs_type = {
1057 .owner = THIS_MODULE,
1058 .name = "ceph",
1059 .mount = ceph_mount,
1060 .kill_sb = ceph_kill_sb,
1061 .fs_flags = FS_RENAME_DOES_D_MOVE,
1062};
1063MODULE_ALIAS_FS("ceph");
1064
1065static int __init init_ceph(void)
1066{
1067 int ret = init_caches();
1068 if (ret)
1069 goto out;
1070
1071 ceph_flock_init();
1072 ceph_xattr_init();
1073 ret = register_filesystem(&ceph_fs_type);
1074 if (ret)
1075 goto out_xattr;
1076
1077 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1078
1079 return 0;
1080
1081out_xattr:
1082 ceph_xattr_exit();
1083 destroy_caches();
1084out:
1085 return ret;
1086}
1087
1088static void __exit exit_ceph(void)
1089{
1090 dout("exit_ceph\n");
1091 unregister_filesystem(&ceph_fs_type);
1092 ceph_xattr_exit();
1093 destroy_caches();
1094}
1095
1096module_init(init_ceph);
1097module_exit(exit_ceph);
1098
1099MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1100MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1101MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1102MODULE_DESCRIPTION("Ceph filesystem for Linux");
1103MODULE_LICENSE("GPL");