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-rw-r--r--fs/ceph/super.c1030
1 files changed, 1030 insertions, 0 deletions
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
new file mode 100644
index 000000000000..4290a6e860b0
--- /dev/null
+++ b/fs/ceph/super.c
@@ -0,0 +1,1030 @@
1
2#include "ceph_debug.h"
3
4#include <linux/backing-dev.h>
5#include <linux/fs.h>
6#include <linux/inet.h>
7#include <linux/in6.h>
8#include <linux/module.h>
9#include <linux/mount.h>
10#include <linux/parser.h>
11#include <linux/rwsem.h>
12#include <linux/sched.h>
13#include <linux/seq_file.h>
14#include <linux/statfs.h>
15#include <linux/string.h>
16#include <linux/version.h>
17#include <linux/vmalloc.h>
18
19#include "decode.h"
20#include "super.h"
21#include "mon_client.h"
22#include "auth.h"
23
24/*
25 * Ceph superblock operations
26 *
27 * Handle the basics of mounting, unmounting.
28 */
29
30
31/*
32 * find filename portion of a path (/foo/bar/baz -> baz)
33 */
34const char *ceph_file_part(const char *s, int len)
35{
36 const char *e = s + len;
37
38 while (e != s && *(e-1) != '/')
39 e--;
40 return e;
41}
42
43
44/*
45 * super ops
46 */
47static void ceph_put_super(struct super_block *s)
48{
49 struct ceph_client *cl = ceph_client(s);
50
51 dout("put_super\n");
52 ceph_mdsc_close_sessions(&cl->mdsc);
53 return;
54}
55
56static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
57{
58 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
59 struct ceph_monmap *monmap = client->monc.monmap;
60 struct ceph_statfs st;
61 u64 fsid;
62 int err;
63
64 dout("statfs\n");
65 err = ceph_monc_do_statfs(&client->monc, &st);
66 if (err < 0)
67 return err;
68
69 /* fill in kstatfs */
70 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
71
72 /*
73 * express utilization in terms of large blocks to avoid
74 * overflow on 32-bit machines.
75 */
76 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
77 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
78 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
79 (CEPH_BLOCK_SHIFT-10);
80 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
81
82 buf->f_files = le64_to_cpu(st.num_objects);
83 buf->f_ffree = -1;
84 buf->f_namelen = PATH_MAX;
85 buf->f_frsize = PAGE_CACHE_SIZE;
86
87 /* leave fsid little-endian, regardless of host endianness */
88 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
89 buf->f_fsid.val[0] = fsid & 0xffffffff;
90 buf->f_fsid.val[1] = fsid >> 32;
91
92 return 0;
93}
94
95
96static int ceph_syncfs(struct super_block *sb, int wait)
97{
98 dout("sync_fs %d\n", wait);
99 ceph_osdc_sync(&ceph_client(sb)->osdc);
100 ceph_mdsc_sync(&ceph_client(sb)->mdsc);
101 dout("sync_fs %d done\n", wait);
102 return 0;
103}
104
105
106/**
107 * ceph_show_options - Show mount options in /proc/mounts
108 * @m: seq_file to write to
109 * @mnt: mount descriptor
110 */
111static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
112{
113 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
114 struct ceph_mount_args *args = client->mount_args;
115
116 if (args->flags & CEPH_OPT_FSID)
117 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
118 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
119 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
120 if (args->flags & CEPH_OPT_NOSHARE)
121 seq_puts(m, ",noshare");
122 if (args->flags & CEPH_OPT_DIRSTAT)
123 seq_puts(m, ",dirstat");
124 if ((args->flags & CEPH_OPT_RBYTES) == 0)
125 seq_puts(m, ",norbytes");
126 if (args->flags & CEPH_OPT_NOCRC)
127 seq_puts(m, ",nocrc");
128 if (args->flags & CEPH_OPT_NOASYNCREADDIR)
129 seq_puts(m, ",noasyncreaddir");
130 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
131 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
132 if (args->name)
133 seq_printf(m, ",name=%s", args->name);
134 if (args->secret)
135 seq_puts(m, ",secret=<hidden>");
136 return 0;
137}
138
139/*
140 * caches
141 */
142struct kmem_cache *ceph_inode_cachep;
143struct kmem_cache *ceph_cap_cachep;
144struct kmem_cache *ceph_dentry_cachep;
145struct kmem_cache *ceph_file_cachep;
146
147static void ceph_inode_init_once(void *foo)
148{
149 struct ceph_inode_info *ci = foo;
150 inode_init_once(&ci->vfs_inode);
151}
152
153static int default_congestion_kb(void)
154{
155 int congestion_kb;
156
157 /*
158 * Copied from NFS
159 *
160 * congestion size, scale with available memory.
161 *
162 * 64MB: 8192k
163 * 128MB: 11585k
164 * 256MB: 16384k
165 * 512MB: 23170k
166 * 1GB: 32768k
167 * 2GB: 46340k
168 * 4GB: 65536k
169 * 8GB: 92681k
170 * 16GB: 131072k
171 *
172 * This allows larger machines to have larger/more transfers.
173 * Limit the default to 256M
174 */
175 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
176 if (congestion_kb > 256*1024)
177 congestion_kb = 256*1024;
178
179 return congestion_kb;
180}
181
182static int __init init_caches(void)
183{
184 ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
185 sizeof(struct ceph_inode_info),
186 __alignof__(struct ceph_inode_info),
187 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
188 ceph_inode_init_once);
189 if (ceph_inode_cachep == NULL)
190 return -ENOMEM;
191
192 ceph_cap_cachep = KMEM_CACHE(ceph_cap,
193 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
194 if (ceph_cap_cachep == NULL)
195 goto bad_cap;
196
197 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
198 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
199 if (ceph_dentry_cachep == NULL)
200 goto bad_dentry;
201
202 ceph_file_cachep = KMEM_CACHE(ceph_file_info,
203 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
204 if (ceph_file_cachep == NULL)
205 goto bad_file;
206
207 return 0;
208
209bad_file:
210 kmem_cache_destroy(ceph_dentry_cachep);
211bad_dentry:
212 kmem_cache_destroy(ceph_cap_cachep);
213bad_cap:
214 kmem_cache_destroy(ceph_inode_cachep);
215 return -ENOMEM;
216}
217
218static void destroy_caches(void)
219{
220 kmem_cache_destroy(ceph_inode_cachep);
221 kmem_cache_destroy(ceph_cap_cachep);
222 kmem_cache_destroy(ceph_dentry_cachep);
223 kmem_cache_destroy(ceph_file_cachep);
224}
225
226
227/*
228 * ceph_umount_begin - initiate forced umount. Tear down down the
229 * mount, skipping steps that may hang while waiting for server(s).
230 */
231static void ceph_umount_begin(struct super_block *sb)
232{
233 struct ceph_client *client = ceph_sb_to_client(sb);
234
235 dout("ceph_umount_begin - starting forced umount\n");
236 if (!client)
237 return;
238 client->mount_state = CEPH_MOUNT_SHUTDOWN;
239 return;
240}
241
242static const struct super_operations ceph_super_ops = {
243 .alloc_inode = ceph_alloc_inode,
244 .destroy_inode = ceph_destroy_inode,
245 .write_inode = ceph_write_inode,
246 .sync_fs = ceph_syncfs,
247 .put_super = ceph_put_super,
248 .show_options = ceph_show_options,
249 .statfs = ceph_statfs,
250 .umount_begin = ceph_umount_begin,
251};
252
253
254const char *ceph_msg_type_name(int type)
255{
256 switch (type) {
257 case CEPH_MSG_SHUTDOWN: return "shutdown";
258 case CEPH_MSG_PING: return "ping";
259 case CEPH_MSG_AUTH: return "auth";
260 case CEPH_MSG_AUTH_REPLY: return "auth_reply";
261 case CEPH_MSG_MON_MAP: return "mon_map";
262 case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
263 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
264 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
265 case CEPH_MSG_STATFS: return "statfs";
266 case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
267 case CEPH_MSG_MDS_MAP: return "mds_map";
268 case CEPH_MSG_CLIENT_SESSION: return "client_session";
269 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
270 case CEPH_MSG_CLIENT_REQUEST: return "client_request";
271 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
272 case CEPH_MSG_CLIENT_REPLY: return "client_reply";
273 case CEPH_MSG_CLIENT_CAPS: return "client_caps";
274 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
275 case CEPH_MSG_CLIENT_SNAP: return "client_snap";
276 case CEPH_MSG_CLIENT_LEASE: return "client_lease";
277 case CEPH_MSG_OSD_MAP: return "osd_map";
278 case CEPH_MSG_OSD_OP: return "osd_op";
279 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
280 default: return "unknown";
281 }
282}
283
284
285/*
286 * mount options
287 */
288enum {
289 Opt_fsidmajor,
290 Opt_fsidminor,
291 Opt_monport,
292 Opt_wsize,
293 Opt_rsize,
294 Opt_osdtimeout,
295 Opt_osdkeepalivetimeout,
296 Opt_mount_timeout,
297 Opt_osd_idle_ttl,
298 Opt_caps_wanted_delay_min,
299 Opt_caps_wanted_delay_max,
300 Opt_readdir_max_entries,
301 Opt_congestion_kb,
302 Opt_last_int,
303 /* int args above */
304 Opt_snapdirname,
305 Opt_name,
306 Opt_secret,
307 Opt_last_string,
308 /* string args above */
309 Opt_ip,
310 Opt_noshare,
311 Opt_dirstat,
312 Opt_nodirstat,
313 Opt_rbytes,
314 Opt_norbytes,
315 Opt_nocrc,
316 Opt_noasyncreaddir,
317};
318
319static match_table_t arg_tokens = {
320 {Opt_fsidmajor, "fsidmajor=%ld"},
321 {Opt_fsidminor, "fsidminor=%ld"},
322 {Opt_monport, "monport=%d"},
323 {Opt_wsize, "wsize=%d"},
324 {Opt_rsize, "rsize=%d"},
325 {Opt_osdtimeout, "osdtimeout=%d"},
326 {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
327 {Opt_mount_timeout, "mount_timeout=%d"},
328 {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
329 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
330 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
331 {Opt_readdir_max_entries, "readdir_max_entries=%d"},
332 {Opt_congestion_kb, "write_congestion_kb=%d"},
333 /* int args above */
334 {Opt_snapdirname, "snapdirname=%s"},
335 {Opt_name, "name=%s"},
336 {Opt_secret, "secret=%s"},
337 /* string args above */
338 {Opt_ip, "ip=%s"},
339 {Opt_noshare, "noshare"},
340 {Opt_dirstat, "dirstat"},
341 {Opt_nodirstat, "nodirstat"},
342 {Opt_rbytes, "rbytes"},
343 {Opt_norbytes, "norbytes"},
344 {Opt_nocrc, "nocrc"},
345 {Opt_noasyncreaddir, "noasyncreaddir"},
346 {-1, NULL}
347};
348
349
350static struct ceph_mount_args *parse_mount_args(int flags, char *options,
351 const char *dev_name,
352 const char **path)
353{
354 struct ceph_mount_args *args;
355 const char *c;
356 int err = -ENOMEM;
357 substring_t argstr[MAX_OPT_ARGS];
358
359 args = kzalloc(sizeof(*args), GFP_KERNEL);
360 if (!args)
361 return ERR_PTR(-ENOMEM);
362 args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
363 GFP_KERNEL);
364 if (!args->mon_addr)
365 goto out;
366
367 dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
368
369 /* start with defaults */
370 args->sb_flags = flags;
371 args->flags = CEPH_OPT_DEFAULT;
372 args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
373 args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
374 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
375 args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */
376 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
377 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
378 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
379 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
380 args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
381 args->max_readdir = 1024;
382 args->congestion_kb = default_congestion_kb();
383
384 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
385 err = -EINVAL;
386 if (!dev_name)
387 goto out;
388 *path = strstr(dev_name, ":/");
389 if (*path == NULL) {
390 pr_err("device name is missing path (no :/ in %s)\n",
391 dev_name);
392 goto out;
393 }
394
395 /* get mon ip(s) */
396 err = ceph_parse_ips(dev_name, *path, args->mon_addr,
397 CEPH_MAX_MON, &args->num_mon);
398 if (err < 0)
399 goto out;
400
401 /* path on server */
402 *path += 2;
403 dout("server path '%s'\n", *path);
404
405 /* parse mount options */
406 while ((c = strsep(&options, ",")) != NULL) {
407 int token, intval, ret;
408 if (!*c)
409 continue;
410 err = -EINVAL;
411 token = match_token((char *)c, arg_tokens, argstr);
412 if (token < 0) {
413 pr_err("bad mount option at '%s'\n", c);
414 goto out;
415 }
416 if (token < Opt_last_int) {
417 ret = match_int(&argstr[0], &intval);
418 if (ret < 0) {
419 pr_err("bad mount option arg (not int) "
420 "at '%s'\n", c);
421 continue;
422 }
423 dout("got int token %d val %d\n", token, intval);
424 } else if (token > Opt_last_int && token < Opt_last_string) {
425 dout("got string token %d val %s\n", token,
426 argstr[0].from);
427 } else {
428 dout("got token %d\n", token);
429 }
430 switch (token) {
431 case Opt_fsidmajor:
432 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
433 break;
434 case Opt_fsidminor:
435 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
436 break;
437 case Opt_ip:
438 err = ceph_parse_ips(argstr[0].from,
439 argstr[0].to,
440 &args->my_addr,
441 1, NULL);
442 if (err < 0)
443 goto out;
444 args->flags |= CEPH_OPT_MYIP;
445 break;
446
447 case Opt_snapdirname:
448 kfree(args->snapdir_name);
449 args->snapdir_name = kstrndup(argstr[0].from,
450 argstr[0].to-argstr[0].from,
451 GFP_KERNEL);
452 break;
453 case Opt_name:
454 args->name = kstrndup(argstr[0].from,
455 argstr[0].to-argstr[0].from,
456 GFP_KERNEL);
457 break;
458 case Opt_secret:
459 args->secret = kstrndup(argstr[0].from,
460 argstr[0].to-argstr[0].from,
461 GFP_KERNEL);
462 break;
463
464 /* misc */
465 case Opt_wsize:
466 args->wsize = intval;
467 break;
468 case Opt_rsize:
469 args->rsize = intval;
470 break;
471 case Opt_osdtimeout:
472 args->osd_timeout = intval;
473 break;
474 case Opt_osdkeepalivetimeout:
475 args->osd_keepalive_timeout = intval;
476 break;
477 case Opt_mount_timeout:
478 args->mount_timeout = intval;
479 break;
480 case Opt_caps_wanted_delay_min:
481 args->caps_wanted_delay_min = intval;
482 break;
483 case Opt_caps_wanted_delay_max:
484 args->caps_wanted_delay_max = intval;
485 break;
486 case Opt_readdir_max_entries:
487 args->max_readdir = intval;
488 break;
489 case Opt_congestion_kb:
490 args->congestion_kb = intval;
491 break;
492
493 case Opt_noshare:
494 args->flags |= CEPH_OPT_NOSHARE;
495 break;
496
497 case Opt_dirstat:
498 args->flags |= CEPH_OPT_DIRSTAT;
499 break;
500 case Opt_nodirstat:
501 args->flags &= ~CEPH_OPT_DIRSTAT;
502 break;
503 case Opt_rbytes:
504 args->flags |= CEPH_OPT_RBYTES;
505 break;
506 case Opt_norbytes:
507 args->flags &= ~CEPH_OPT_RBYTES;
508 break;
509 case Opt_nocrc:
510 args->flags |= CEPH_OPT_NOCRC;
511 break;
512 case Opt_noasyncreaddir:
513 args->flags |= CEPH_OPT_NOASYNCREADDIR;
514 break;
515
516 default:
517 BUG_ON(token);
518 }
519 }
520 return args;
521
522out:
523 kfree(args->mon_addr);
524 kfree(args);
525 return ERR_PTR(err);
526}
527
528static void destroy_mount_args(struct ceph_mount_args *args)
529{
530 dout("destroy_mount_args %p\n", args);
531 kfree(args->snapdir_name);
532 args->snapdir_name = NULL;
533 kfree(args->name);
534 args->name = NULL;
535 kfree(args->secret);
536 args->secret = NULL;
537 kfree(args);
538}
539
540/*
541 * create a fresh client instance
542 */
543static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
544{
545 struct ceph_client *client;
546 int err = -ENOMEM;
547
548 client = kzalloc(sizeof(*client), GFP_KERNEL);
549 if (client == NULL)
550 return ERR_PTR(-ENOMEM);
551
552 mutex_init(&client->mount_mutex);
553
554 init_waitqueue_head(&client->auth_wq);
555
556 client->sb = NULL;
557 client->mount_state = CEPH_MOUNT_MOUNTING;
558 client->mount_args = args;
559
560 client->msgr = NULL;
561
562 client->auth_err = 0;
563 atomic_long_set(&client->writeback_count, 0);
564
565 err = bdi_init(&client->backing_dev_info);
566 if (err < 0)
567 goto fail;
568
569 err = -ENOMEM;
570 client->wb_wq = create_workqueue("ceph-writeback");
571 if (client->wb_wq == NULL)
572 goto fail_bdi;
573 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
574 if (client->pg_inv_wq == NULL)
575 goto fail_wb_wq;
576 client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
577 if (client->trunc_wq == NULL)
578 goto fail_pg_inv_wq;
579
580 /* set up mempools */
581 err = -ENOMEM;
582 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
583 client->mount_args->wsize >> PAGE_CACHE_SHIFT);
584 if (!client->wb_pagevec_pool)
585 goto fail_trunc_wq;
586
587 /* caps */
588 client->min_caps = args->max_readdir;
589 ceph_adjust_min_caps(client->min_caps);
590
591 /* subsystems */
592 err = ceph_monc_init(&client->monc, client);
593 if (err < 0)
594 goto fail_mempool;
595 err = ceph_osdc_init(&client->osdc, client);
596 if (err < 0)
597 goto fail_monc;
598 err = ceph_mdsc_init(&client->mdsc, client);
599 if (err < 0)
600 goto fail_osdc;
601 return client;
602
603fail_osdc:
604 ceph_osdc_stop(&client->osdc);
605fail_monc:
606 ceph_monc_stop(&client->monc);
607fail_mempool:
608 mempool_destroy(client->wb_pagevec_pool);
609fail_trunc_wq:
610 destroy_workqueue(client->trunc_wq);
611fail_pg_inv_wq:
612 destroy_workqueue(client->pg_inv_wq);
613fail_wb_wq:
614 destroy_workqueue(client->wb_wq);
615fail_bdi:
616 bdi_destroy(&client->backing_dev_info);
617fail:
618 kfree(client);
619 return ERR_PTR(err);
620}
621
622static void ceph_destroy_client(struct ceph_client *client)
623{
624 dout("destroy_client %p\n", client);
625
626 /* unmount */
627 ceph_mdsc_stop(&client->mdsc);
628 ceph_monc_stop(&client->monc);
629 ceph_osdc_stop(&client->osdc);
630
631 ceph_adjust_min_caps(-client->min_caps);
632
633 ceph_debugfs_client_cleanup(client);
634 destroy_workqueue(client->wb_wq);
635 destroy_workqueue(client->pg_inv_wq);
636 destroy_workqueue(client->trunc_wq);
637
638 if (client->msgr)
639 ceph_messenger_destroy(client->msgr);
640 mempool_destroy(client->wb_pagevec_pool);
641
642 destroy_mount_args(client->mount_args);
643
644 kfree(client);
645 dout("destroy_client %p done\n", client);
646}
647
648/*
649 * Initially learn our fsid, or verify an fsid matches.
650 */
651int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
652{
653 if (client->have_fsid) {
654 if (ceph_fsid_compare(&client->fsid, fsid)) {
655 pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
656 PR_FSID(&client->fsid), PR_FSID(fsid));
657 return -1;
658 }
659 } else {
660 pr_info("client%lld fsid " FSID_FORMAT "\n",
661 client->monc.auth->global_id, PR_FSID(fsid));
662 memcpy(&client->fsid, fsid, sizeof(*fsid));
663 ceph_debugfs_client_init(client);
664 client->have_fsid = true;
665 }
666 return 0;
667}
668
669/*
670 * true if we have the mon map (and have thus joined the cluster)
671 */
672static int have_mon_map(struct ceph_client *client)
673{
674 return client->monc.monmap && client->monc.monmap->epoch;
675}
676
677/*
678 * Bootstrap mount by opening the root directory. Note the mount
679 * @started time from caller, and time out if this takes too long.
680 */
681static struct dentry *open_root_dentry(struct ceph_client *client,
682 const char *path,
683 unsigned long started)
684{
685 struct ceph_mds_client *mdsc = &client->mdsc;
686 struct ceph_mds_request *req = NULL;
687 int err;
688 struct dentry *root;
689
690 /* open dir */
691 dout("open_root_inode opening '%s'\n", path);
692 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
693 if (IS_ERR(req))
694 return ERR_PTR(PTR_ERR(req));
695 req->r_path1 = kstrdup(path, GFP_NOFS);
696 req->r_ino1.ino = CEPH_INO_ROOT;
697 req->r_ino1.snap = CEPH_NOSNAP;
698 req->r_started = started;
699 req->r_timeout = client->mount_args->mount_timeout * HZ;
700 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
701 req->r_num_caps = 2;
702 err = ceph_mdsc_do_request(mdsc, NULL, req);
703 if (err == 0) {
704 dout("open_root_inode success\n");
705 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
706 client->sb->s_root == NULL)
707 root = d_alloc_root(req->r_target_inode);
708 else
709 root = d_obtain_alias(req->r_target_inode);
710 req->r_target_inode = NULL;
711 dout("open_root_inode success, root dentry is %p\n", root);
712 } else {
713 root = ERR_PTR(err);
714 }
715 ceph_mdsc_put_request(req);
716 return root;
717}
718
719/*
720 * mount: join the ceph cluster, and open root directory.
721 */
722static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
723 const char *path)
724{
725 struct ceph_entity_addr *myaddr = NULL;
726 int err;
727 unsigned long timeout = client->mount_args->mount_timeout * HZ;
728 unsigned long started = jiffies; /* note the start time */
729 struct dentry *root;
730
731 dout("mount start\n");
732 mutex_lock(&client->mount_mutex);
733
734 /* initialize the messenger */
735 if (client->msgr == NULL) {
736 if (ceph_test_opt(client, MYIP))
737 myaddr = &client->mount_args->my_addr;
738 client->msgr = ceph_messenger_create(myaddr);
739 if (IS_ERR(client->msgr)) {
740 err = PTR_ERR(client->msgr);
741 client->msgr = NULL;
742 goto out;
743 }
744 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
745 }
746
747 /* open session, and wait for mon, mds, and osd maps */
748 err = ceph_monc_open_session(&client->monc);
749 if (err < 0)
750 goto out;
751
752 while (!have_mon_map(client)) {
753 err = -EIO;
754 if (timeout && time_after_eq(jiffies, started + timeout))
755 goto out;
756
757 /* wait */
758 dout("mount waiting for mon_map\n");
759 err = wait_event_interruptible_timeout(client->auth_wq,
760 have_mon_map(client) || (client->auth_err < 0),
761 timeout);
762 if (err == -EINTR || err == -ERESTARTSYS)
763 goto out;
764 if (client->auth_err < 0) {
765 err = client->auth_err;
766 goto out;
767 }
768 }
769
770 dout("mount opening root\n");
771 root = open_root_dentry(client, "", started);
772 if (IS_ERR(root)) {
773 err = PTR_ERR(root);
774 goto out;
775 }
776 if (client->sb->s_root)
777 dput(root);
778 else
779 client->sb->s_root = root;
780
781 if (path[0] == 0) {
782 dget(root);
783 } else {
784 dout("mount opening base mountpoint\n");
785 root = open_root_dentry(client, path, started);
786 if (IS_ERR(root)) {
787 err = PTR_ERR(root);
788 dput(client->sb->s_root);
789 client->sb->s_root = NULL;
790 goto out;
791 }
792 }
793
794 mnt->mnt_root = root;
795 mnt->mnt_sb = client->sb;
796
797 client->mount_state = CEPH_MOUNT_MOUNTED;
798 dout("mount success\n");
799 err = 0;
800
801out:
802 mutex_unlock(&client->mount_mutex);
803 return err;
804}
805
806static int ceph_set_super(struct super_block *s, void *data)
807{
808 struct ceph_client *client = data;
809 int ret;
810
811 dout("set_super %p data %p\n", s, data);
812
813 s->s_flags = client->mount_args->sb_flags;
814 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
815
816 s->s_fs_info = client;
817 client->sb = s;
818
819 s->s_op = &ceph_super_ops;
820 s->s_export_op = &ceph_export_ops;
821
822 s->s_time_gran = 1000; /* 1000 ns == 1 us */
823
824 ret = set_anon_super(s, NULL); /* what is that second arg for? */
825 if (ret != 0)
826 goto fail;
827
828 return ret;
829
830fail:
831 s->s_fs_info = NULL;
832 client->sb = NULL;
833 return ret;
834}
835
836/*
837 * share superblock if same fs AND options
838 */
839static int ceph_compare_super(struct super_block *sb, void *data)
840{
841 struct ceph_client *new = data;
842 struct ceph_mount_args *args = new->mount_args;
843 struct ceph_client *other = ceph_sb_to_client(sb);
844 int i;
845
846 dout("ceph_compare_super %p\n", sb);
847 if (args->flags & CEPH_OPT_FSID) {
848 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
849 dout("fsid doesn't match\n");
850 return 0;
851 }
852 } else {
853 /* do we share (a) monitor? */
854 for (i = 0; i < new->monc.monmap->num_mon; i++)
855 if (ceph_monmap_contains(other->monc.monmap,
856 &new->monc.monmap->mon_inst[i].addr))
857 break;
858 if (i == new->monc.monmap->num_mon) {
859 dout("mon ip not part of monmap\n");
860 return 0;
861 }
862 dout("mon ip matches existing sb %p\n", sb);
863 }
864 if (args->sb_flags != other->mount_args->sb_flags) {
865 dout("flags differ\n");
866 return 0;
867 }
868 return 1;
869}
870
871/*
872 * construct our own bdi so we can control readahead, etc.
873 */
874static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
875{
876 int err;
877
878 sb->s_bdi = &client->backing_dev_info;
879
880 /* set ra_pages based on rsize mount option? */
881 if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
882 client->backing_dev_info.ra_pages =
883 (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
884 >> PAGE_SHIFT;
885 err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
886 return err;
887}
888
889static int ceph_get_sb(struct file_system_type *fs_type,
890 int flags, const char *dev_name, void *data,
891 struct vfsmount *mnt)
892{
893 struct super_block *sb;
894 struct ceph_client *client;
895 int err;
896 int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
897 const char *path = NULL;
898 struct ceph_mount_args *args;
899
900 dout("ceph_get_sb\n");
901 args = parse_mount_args(flags, data, dev_name, &path);
902 if (IS_ERR(args)) {
903 err = PTR_ERR(args);
904 goto out_final;
905 }
906
907 /* create client (which we may/may not use) */
908 client = ceph_create_client(args);
909 if (IS_ERR(client)) {
910 err = PTR_ERR(client);
911 goto out_final;
912 }
913
914 if (client->mount_args->flags & CEPH_OPT_NOSHARE)
915 compare_super = NULL;
916 sb = sget(fs_type, compare_super, ceph_set_super, client);
917 if (IS_ERR(sb)) {
918 err = PTR_ERR(sb);
919 goto out;
920 }
921
922 if (ceph_client(sb) != client) {
923 ceph_destroy_client(client);
924 client = ceph_client(sb);
925 dout("get_sb got existing client %p\n", client);
926 } else {
927 dout("get_sb using new client %p\n", client);
928 err = ceph_register_bdi(sb, client);
929 if (err < 0)
930 goto out_splat;
931 }
932
933 err = ceph_mount(client, mnt, path);
934 if (err < 0)
935 goto out_splat;
936 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
937 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
938 return 0;
939
940out_splat:
941 ceph_mdsc_close_sessions(&client->mdsc);
942 up_write(&sb->s_umount);
943 deactivate_super(sb);
944 goto out_final;
945
946out:
947 ceph_destroy_client(client);
948out_final:
949 dout("ceph_get_sb fail %d\n", err);
950 return err;
951}
952
953static void ceph_kill_sb(struct super_block *s)
954{
955 struct ceph_client *client = ceph_sb_to_client(s);
956 dout("kill_sb %p\n", s);
957 ceph_mdsc_pre_umount(&client->mdsc);
958 kill_anon_super(s); /* will call put_super after sb is r/o */
959 if (s->s_bdi == &client->backing_dev_info)
960 bdi_unregister(&client->backing_dev_info);
961 bdi_destroy(&client->backing_dev_info);
962 ceph_destroy_client(client);
963}
964
965static struct file_system_type ceph_fs_type = {
966 .owner = THIS_MODULE,
967 .name = "ceph",
968 .get_sb = ceph_get_sb,
969 .kill_sb = ceph_kill_sb,
970 .fs_flags = FS_RENAME_DOES_D_MOVE,
971};
972
973#define _STRINGIFY(x) #x
974#define STRINGIFY(x) _STRINGIFY(x)
975
976static int __init init_ceph(void)
977{
978 int ret = 0;
979
980 ret = ceph_debugfs_init();
981 if (ret < 0)
982 goto out;
983
984 ret = ceph_msgr_init();
985 if (ret < 0)
986 goto out_debugfs;
987
988 ret = init_caches();
989 if (ret)
990 goto out_msgr;
991
992 ceph_caps_init();
993
994 ret = register_filesystem(&ceph_fs_type);
995 if (ret)
996 goto out_icache;
997
998 pr_info("loaded %d.%d.%d (mon/mds/osd proto %d/%d/%d)\n",
999 CEPH_VERSION_MAJOR, CEPH_VERSION_MINOR, CEPH_VERSION_PATCH,
1000 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL);
1001 return 0;
1002
1003out_icache:
1004 destroy_caches();
1005out_msgr:
1006 ceph_msgr_exit();
1007out_debugfs:
1008 ceph_debugfs_cleanup();
1009out:
1010 return ret;
1011}
1012
1013static void __exit exit_ceph(void)
1014{
1015 dout("exit_ceph\n");
1016 unregister_filesystem(&ceph_fs_type);
1017 ceph_caps_finalize();
1018 destroy_caches();
1019 ceph_msgr_exit();
1020 ceph_debugfs_cleanup();
1021}
1022
1023module_init(init_ceph);
1024module_exit(exit_ceph);
1025
1026MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1027MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1028MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1029MODULE_DESCRIPTION("Ceph filesystem for Linux");
1030MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-02 17:16:23 -0500