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