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TOMOYO Linux Cross Reference
Linux/fs/ceph/super.c

Version: ~ [ linux-5.3-rc4 ] ~ [ linux-5.2.8 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.66 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.138 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.71 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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/ceph_features.h>
 22 #include <linux/ceph/decode.h>
 23 #include <linux/ceph/mon_client.h>
 24 #include <linux/ceph/auth.h>
 25 #include <linux/ceph/debugfs.h>
 26 
 27 /*
 28  * Ceph superblock operations
 29  *
 30  * Handle the basics of mounting, unmounting.
 31  */
 32 
 33 /*
 34  * super ops
 35  */
 36 static void ceph_put_super(struct super_block *s)
 37 {
 38         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
 39 
 40         dout("put_super\n");
 41         ceph_mdsc_close_sessions(fsc->mdsc);
 42 
 43         /*
 44          * ensure we release the bdi before put_anon_super releases
 45          * the device name.
 46          */
 47         if (s->s_bdi == &fsc->backing_dev_info) {
 48                 bdi_unregister(&fsc->backing_dev_info);
 49                 s->s_bdi = NULL;
 50         }
 51 
 52         return;
 53 }
 54 
 55 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
 56 {
 57         struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
 58         struct ceph_monmap *monmap = fsc->client->monc.monmap;
 59         struct ceph_statfs st;
 60         u64 fsid;
 61         int err;
 62 
 63         dout("statfs\n");
 64         err = ceph_monc_do_statfs(&fsc->client->monc, &st);
 65         if (err < 0)
 66                 return err;
 67 
 68         /* fill in kstatfs */
 69         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
 70 
 71         /*
 72          * express utilization in terms of large blocks to avoid
 73          * overflow on 32-bit machines.
 74          *
 75          * NOTE: for the time being, we make bsize == frsize to humor
 76          * not-yet-ancient versions of glibc that are broken.
 77          * Someday, we will probably want to report a real block
 78          * size...  whatever that may mean for a network file system!
 79          */
 80         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
 81         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
 82         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
 83         buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
 84         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
 85 
 86         buf->f_files = le64_to_cpu(st.num_objects);
 87         buf->f_ffree = -1;
 88         buf->f_namelen = NAME_MAX;
 89 
 90         /* leave fsid little-endian, regardless of host endianness */
 91         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
 92         buf->f_fsid.val[0] = fsid & 0xffffffff;
 93         buf->f_fsid.val[1] = fsid >> 32;
 94 
 95         return 0;
 96 }
 97 
 98 
 99 static int ceph_sync_fs(struct super_block *sb, int wait)
100 {
101         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
102 
103         if (!wait) {
104                 dout("sync_fs (non-blocking)\n");
105                 ceph_flush_dirty_caps(fsc->mdsc);
106                 dout("sync_fs (non-blocking) done\n");
107                 return 0;
108         }
109 
110         dout("sync_fs (blocking)\n");
111         ceph_osdc_sync(&fsc->client->osdc);
112         ceph_mdsc_sync(fsc->mdsc);
113         dout("sync_fs (blocking) done\n");
114         return 0;
115 }
116 
117 /*
118  * mount options
119  */
120 enum {
121         Opt_wsize,
122         Opt_rsize,
123         Opt_rasize,
124         Opt_caps_wanted_delay_min,
125         Opt_caps_wanted_delay_max,
126         Opt_cap_release_safety,
127         Opt_readdir_max_entries,
128         Opt_readdir_max_bytes,
129         Opt_congestion_kb,
130         Opt_last_int,
131         /* int args above */
132         Opt_snapdirname,
133         Opt_last_string,
134         /* string args above */
135         Opt_dirstat,
136         Opt_nodirstat,
137         Opt_rbytes,
138         Opt_norbytes,
139         Opt_asyncreaddir,
140         Opt_noasyncreaddir,
141         Opt_dcache,
142         Opt_nodcache,
143         Opt_ino32,
144         Opt_noino32,
145 };
146 
147 static match_table_t fsopt_tokens = {
148         {Opt_wsize, "wsize=%d"},
149         {Opt_rsize, "rsize=%d"},
150         {Opt_rasize, "rasize=%d"},
151         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
152         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
153         {Opt_cap_release_safety, "cap_release_safety=%d"},
154         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
155         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
156         {Opt_congestion_kb, "write_congestion_kb=%d"},
157         /* int args above */
158         {Opt_snapdirname, "snapdirname=%s"},
159         /* string args above */
160         {Opt_dirstat, "dirstat"},
161         {Opt_nodirstat, "nodirstat"},
162         {Opt_rbytes, "rbytes"},
163         {Opt_norbytes, "norbytes"},
164         {Opt_asyncreaddir, "asyncreaddir"},
165         {Opt_noasyncreaddir, "noasyncreaddir"},
166         {Opt_dcache, "dcache"},
167         {Opt_nodcache, "nodcache"},
168         {Opt_ino32, "ino32"},
169         {Opt_noino32, "noino32"},
170         {-1, NULL}
171 };
172 
173 static int parse_fsopt_token(char *c, void *private)
174 {
175         struct ceph_mount_options *fsopt = private;
176         substring_t argstr[MAX_OPT_ARGS];
177         int token, intval, ret;
178 
179         token = match_token((char *)c, fsopt_tokens, argstr);
180         if (token < 0)
181                 return -EINVAL;
182 
183         if (token < Opt_last_int) {
184                 ret = match_int(&argstr[0], &intval);
185                 if (ret < 0) {
186                         pr_err("bad mount option arg (not int) "
187                                "at '%s'\n", c);
188                         return ret;
189                 }
190                 dout("got int token %d val %d\n", token, intval);
191         } else if (token > Opt_last_int && token < Opt_last_string) {
192                 dout("got string token %d val %s\n", token,
193                      argstr[0].from);
194         } else {
195                 dout("got token %d\n", token);
196         }
197 
198         switch (token) {
199         case Opt_snapdirname:
200                 kfree(fsopt->snapdir_name);
201                 fsopt->snapdir_name = kstrndup(argstr[0].from,
202                                                argstr[0].to-argstr[0].from,
203                                                GFP_KERNEL);
204                 if (!fsopt->snapdir_name)
205                         return -ENOMEM;
206                 break;
207 
208                 /* misc */
209         case Opt_wsize:
210                 fsopt->wsize = intval;
211                 break;
212         case Opt_rsize:
213                 fsopt->rsize = intval;
214                 break;
215         case Opt_rasize:
216                 fsopt->rasize = intval;
217                 break;
218         case Opt_caps_wanted_delay_min:
219                 fsopt->caps_wanted_delay_min = intval;
220                 break;
221         case Opt_caps_wanted_delay_max:
222                 fsopt->caps_wanted_delay_max = intval;
223                 break;
224         case Opt_readdir_max_entries:
225                 fsopt->max_readdir = intval;
226                 break;
227         case Opt_readdir_max_bytes:
228                 fsopt->max_readdir_bytes = intval;
229                 break;
230         case Opt_congestion_kb:
231                 fsopt->congestion_kb = intval;
232                 break;
233         case Opt_dirstat:
234                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
235                 break;
236         case Opt_nodirstat:
237                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
238                 break;
239         case Opt_rbytes:
240                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
241                 break;
242         case Opt_norbytes:
243                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
244                 break;
245         case Opt_asyncreaddir:
246                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
247                 break;
248         case Opt_noasyncreaddir:
249                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
250                 break;
251         case Opt_dcache:
252                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
253                 break;
254         case Opt_nodcache:
255                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
256                 break;
257         case Opt_ino32:
258                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
259                 break;
260         case Opt_noino32:
261                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
262                 break;
263         default:
264                 BUG_ON(token);
265         }
266         return 0;
267 }
268 
269 static void destroy_mount_options(struct ceph_mount_options *args)
270 {
271         dout("destroy_mount_options %p\n", args);
272         kfree(args->snapdir_name);
273         kfree(args);
274 }
275 
276 static int strcmp_null(const char *s1, const char *s2)
277 {
278         if (!s1 && !s2)
279                 return 0;
280         if (s1 && !s2)
281                 return -1;
282         if (!s1 && s2)
283                 return 1;
284         return strcmp(s1, s2);
285 }
286 
287 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
288                                  struct ceph_options *new_opt,
289                                  struct ceph_fs_client *fsc)
290 {
291         struct ceph_mount_options *fsopt1 = new_fsopt;
292         struct ceph_mount_options *fsopt2 = fsc->mount_options;
293         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
294         int ret;
295 
296         ret = memcmp(fsopt1, fsopt2, ofs);
297         if (ret)
298                 return ret;
299 
300         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
301         if (ret)
302                 return ret;
303 
304         return ceph_compare_options(new_opt, fsc->client);
305 }
306 
307 static int parse_mount_options(struct ceph_mount_options **pfsopt,
308                                struct ceph_options **popt,
309                                int flags, char *options,
310                                const char *dev_name,
311                                const char **path)
312 {
313         struct ceph_mount_options *fsopt;
314         const char *dev_name_end;
315         int err;
316 
317         if (!dev_name || !*dev_name)
318                 return -EINVAL;
319 
320         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
321         if (!fsopt)
322                 return -ENOMEM;
323 
324         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
325 
326         fsopt->sb_flags = flags;
327         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
328 
329         fsopt->rsize = CEPH_RSIZE_DEFAULT;
330         fsopt->rasize = CEPH_RASIZE_DEFAULT;
331         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
332         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
333         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
334         fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
335         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
336         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
337         fsopt->congestion_kb = default_congestion_kb();
338 
339         /*
340          * Distinguish the server list from the path in "dev_name".
341          * Internally we do not include the leading '/' in the path.
342          *
343          * "dev_name" will look like:
344          *     <server_spec>[,<server_spec>...]:[<path>]
345          * where
346          *     <server_spec> is <ip>[:<port>]
347          *     <path> is optional, but if present must begin with '/'
348          */
349         dev_name_end = strchr(dev_name, '/');
350         if (dev_name_end) {
351                 /* skip over leading '/' for path */
352                 *path = dev_name_end + 1;
353         } else {
354                 /* path is empty */
355                 dev_name_end = dev_name + strlen(dev_name);
356                 *path = dev_name_end;
357         }
358         err = -EINVAL;
359         dev_name_end--;         /* back up to ':' separator */
360         if (dev_name_end < dev_name || *dev_name_end != ':') {
361                 pr_err("device name is missing path (no : separator in %s)\n",
362                                 dev_name);
363                 goto out;
364         }
365         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
366         dout("server path '%s'\n", *path);
367 
368         *popt = ceph_parse_options(options, dev_name, dev_name_end,
369                                  parse_fsopt_token, (void *)fsopt);
370         if (IS_ERR(*popt)) {
371                 err = PTR_ERR(*popt);
372                 goto out;
373         }
374 
375         /* success */
376         *pfsopt = fsopt;
377         return 0;
378 
379 out:
380         destroy_mount_options(fsopt);
381         return err;
382 }
383 
384 /**
385  * ceph_show_options - Show mount options in /proc/mounts
386  * @m: seq_file to write to
387  * @root: root of that (sub)tree
388  */
389 static int ceph_show_options(struct seq_file *m, struct dentry *root)
390 {
391         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
392         struct ceph_mount_options *fsopt = fsc->mount_options;
393         struct ceph_options *opt = fsc->client->options;
394 
395         if (opt->flags & CEPH_OPT_FSID)
396                 seq_printf(m, ",fsid=%pU", &opt->fsid);
397         if (opt->flags & CEPH_OPT_NOSHARE)
398                 seq_puts(m, ",noshare");
399         if (opt->flags & CEPH_OPT_NOCRC)
400                 seq_puts(m, ",nocrc");
401 
402         if (opt->name)
403                 seq_printf(m, ",name=%s", opt->name);
404         if (opt->key)
405                 seq_puts(m, ",secret=<hidden>");
406 
407         if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
408                 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
409         if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
410                 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
411         if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
412                 seq_printf(m, ",osdkeepalivetimeout=%d",
413                            opt->osd_keepalive_timeout);
414 
415         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
416                 seq_puts(m, ",dirstat");
417         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
418                 seq_puts(m, ",norbytes");
419         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
420                 seq_puts(m, ",noasyncreaddir");
421         if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
422                 seq_puts(m, ",dcache");
423         else
424                 seq_puts(m, ",nodcache");
425 
426         if (fsopt->wsize)
427                 seq_printf(m, ",wsize=%d", fsopt->wsize);
428         if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
429                 seq_printf(m, ",rsize=%d", fsopt->rsize);
430         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
431                 seq_printf(m, ",rasize=%d", fsopt->rasize);
432         if (fsopt->congestion_kb != default_congestion_kb())
433                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
434         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
435                 seq_printf(m, ",caps_wanted_delay_min=%d",
436                          fsopt->caps_wanted_delay_min);
437         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
438                 seq_printf(m, ",caps_wanted_delay_max=%d",
439                            fsopt->caps_wanted_delay_max);
440         if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
441                 seq_printf(m, ",cap_release_safety=%d",
442                            fsopt->cap_release_safety);
443         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
444                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
445         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
446                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
447         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
448                 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
449         return 0;
450 }
451 
452 /*
453  * handle any mon messages the standard library doesn't understand.
454  * return error if we don't either.
455  */
456 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
457 {
458         struct ceph_fs_client *fsc = client->private;
459         int type = le16_to_cpu(msg->hdr.type);
460 
461         switch (type) {
462         case CEPH_MSG_MDS_MAP:
463                 ceph_mdsc_handle_map(fsc->mdsc, msg);
464                 return 0;
465 
466         default:
467                 return -1;
468         }
469 }
470 
471 /*
472  * create a new fs client
473  */
474 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
475                                         struct ceph_options *opt)
476 {
477         struct ceph_fs_client *fsc;
478         const unsigned supported_features =
479                 CEPH_FEATURE_FLOCK |
480                 CEPH_FEATURE_DIRLAYOUTHASH;
481         const unsigned required_features = 0;
482         int page_count;
483         size_t size;
484         int err = -ENOMEM;
485 
486         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
487         if (!fsc)
488                 return ERR_PTR(-ENOMEM);
489 
490         fsc->client = ceph_create_client(opt, fsc, supported_features,
491                                          required_features);
492         if (IS_ERR(fsc->client)) {
493                 err = PTR_ERR(fsc->client);
494                 goto fail;
495         }
496         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
497         fsc->client->monc.want_mdsmap = 1;
498 
499         fsc->mount_options = fsopt;
500 
501         fsc->sb = NULL;
502         fsc->mount_state = CEPH_MOUNT_MOUNTING;
503 
504         atomic_long_set(&fsc->writeback_count, 0);
505 
506         err = bdi_init(&fsc->backing_dev_info);
507         if (err < 0)
508                 goto fail_client;
509 
510         err = -ENOMEM;
511         /*
512          * The number of concurrent works can be high but they don't need
513          * to be processed in parallel, limit concurrency.
514          */
515         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
516         if (fsc->wb_wq == NULL)
517                 goto fail_bdi;
518         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
519         if (fsc->pg_inv_wq == NULL)
520                 goto fail_wb_wq;
521         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
522         if (fsc->trunc_wq == NULL)
523                 goto fail_pg_inv_wq;
524 
525         /* set up mempools */
526         err = -ENOMEM;
527         page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
528         size = sizeof (struct page *) * (page_count ? page_count : 1);
529         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
530         if (!fsc->wb_pagevec_pool)
531                 goto fail_trunc_wq;
532 
533         /* caps */
534         fsc->min_caps = fsopt->max_readdir;
535 
536         return fsc;
537 
538 fail_trunc_wq:
539         destroy_workqueue(fsc->trunc_wq);
540 fail_pg_inv_wq:
541         destroy_workqueue(fsc->pg_inv_wq);
542 fail_wb_wq:
543         destroy_workqueue(fsc->wb_wq);
544 fail_bdi:
545         bdi_destroy(&fsc->backing_dev_info);
546 fail_client:
547         ceph_destroy_client(fsc->client);
548 fail:
549         kfree(fsc);
550         return ERR_PTR(err);
551 }
552 
553 static void destroy_fs_client(struct ceph_fs_client *fsc)
554 {
555         dout("destroy_fs_client %p\n", fsc);
556 
557         destroy_workqueue(fsc->wb_wq);
558         destroy_workqueue(fsc->pg_inv_wq);
559         destroy_workqueue(fsc->trunc_wq);
560 
561         bdi_destroy(&fsc->backing_dev_info);
562 
563         mempool_destroy(fsc->wb_pagevec_pool);
564 
565         destroy_mount_options(fsc->mount_options);
566 
567         ceph_fs_debugfs_cleanup(fsc);
568 
569         ceph_destroy_client(fsc->client);
570 
571         kfree(fsc);
572         dout("destroy_fs_client %p done\n", fsc);
573 }
574 
575 /*
576  * caches
577  */
578 struct kmem_cache *ceph_inode_cachep;
579 struct kmem_cache *ceph_cap_cachep;
580 struct kmem_cache *ceph_dentry_cachep;
581 struct kmem_cache *ceph_file_cachep;
582 
583 static void ceph_inode_init_once(void *foo)
584 {
585         struct ceph_inode_info *ci = foo;
586         inode_init_once(&ci->vfs_inode);
587 }
588 
589 static int __init init_caches(void)
590 {
591         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
592                                       sizeof(struct ceph_inode_info),
593                                       __alignof__(struct ceph_inode_info),
594                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
595                                       ceph_inode_init_once);
596         if (ceph_inode_cachep == NULL)
597                 return -ENOMEM;
598 
599         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
600                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
601         if (ceph_cap_cachep == NULL)
602                 goto bad_cap;
603 
604         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
605                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
606         if (ceph_dentry_cachep == NULL)
607                 goto bad_dentry;
608 
609         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
610                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
611         if (ceph_file_cachep == NULL)
612                 goto bad_file;
613 
614         return 0;
615 
616 bad_file:
617         kmem_cache_destroy(ceph_dentry_cachep);
618 bad_dentry:
619         kmem_cache_destroy(ceph_cap_cachep);
620 bad_cap:
621         kmem_cache_destroy(ceph_inode_cachep);
622         return -ENOMEM;
623 }
624 
625 static void destroy_caches(void)
626 {
627         /*
628          * Make sure all delayed rcu free inodes are flushed before we
629          * destroy cache.
630          */
631         rcu_barrier();
632         kmem_cache_destroy(ceph_inode_cachep);
633         kmem_cache_destroy(ceph_cap_cachep);
634         kmem_cache_destroy(ceph_dentry_cachep);
635         kmem_cache_destroy(ceph_file_cachep);
636 }
637 
638 
639 /*
640  * ceph_umount_begin - initiate forced umount.  Tear down down the
641  * mount, skipping steps that may hang while waiting for server(s).
642  */
643 static void ceph_umount_begin(struct super_block *sb)
644 {
645         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
646 
647         dout("ceph_umount_begin - starting forced umount\n");
648         if (!fsc)
649                 return;
650         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
651         return;
652 }
653 
654 static const struct super_operations ceph_super_ops = {
655         .alloc_inode    = ceph_alloc_inode,
656         .destroy_inode  = ceph_destroy_inode,
657         .write_inode    = ceph_write_inode,
658         .sync_fs        = ceph_sync_fs,
659         .put_super      = ceph_put_super,
660         .show_options   = ceph_show_options,
661         .statfs         = ceph_statfs,
662         .umount_begin   = ceph_umount_begin,
663 };
664 
665 /*
666  * Bootstrap mount by opening the root directory.  Note the mount
667  * @started time from caller, and time out if this takes too long.
668  */
669 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
670                                        const char *path,
671                                        unsigned long started)
672 {
673         struct ceph_mds_client *mdsc = fsc->mdsc;
674         struct ceph_mds_request *req = NULL;
675         int err;
676         struct dentry *root;
677 
678         /* open dir */
679         dout("open_root_inode opening '%s'\n", path);
680         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
681         if (IS_ERR(req))
682                 return ERR_CAST(req);
683         req->r_path1 = kstrdup(path, GFP_NOFS);
684         req->r_ino1.ino = CEPH_INO_ROOT;
685         req->r_ino1.snap = CEPH_NOSNAP;
686         req->r_started = started;
687         req->r_timeout = fsc->client->options->mount_timeout * HZ;
688         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
689         req->r_num_caps = 2;
690         err = ceph_mdsc_do_request(mdsc, NULL, req);
691         if (err == 0) {
692                 struct inode *inode = req->r_target_inode;
693                 req->r_target_inode = NULL;
694                 dout("open_root_inode success\n");
695                 if (ceph_ino(inode) == CEPH_INO_ROOT &&
696                     fsc->sb->s_root == NULL) {
697                         root = d_make_root(inode);
698                         if (!root) {
699                                 root = ERR_PTR(-ENOMEM);
700                                 goto out;
701                         }
702                 } else {
703                         root = d_obtain_alias(inode);
704                 }
705                 ceph_init_dentry(root);
706                 dout("open_root_inode success, root dentry is %p\n", root);
707         } else {
708                 root = ERR_PTR(err);
709         }
710 out:
711         ceph_mdsc_put_request(req);
712         return root;
713 }
714 
715 
716 
717 
718 /*
719  * mount: join the ceph cluster, and open root directory.
720  */
721 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
722                       const char *path)
723 {
724         int err;
725         unsigned long started = jiffies;  /* note the start time */
726         struct dentry *root;
727         int first = 0;   /* first vfsmount for this super_block */
728 
729         dout("mount start\n");
730         mutex_lock(&fsc->client->mount_mutex);
731 
732         err = __ceph_open_session(fsc->client, started);
733         if (err < 0)
734                 goto out;
735 
736         dout("mount opening root\n");
737         root = open_root_dentry(fsc, "", started);
738         if (IS_ERR(root)) {
739                 err = PTR_ERR(root);
740                 goto out;
741         }
742         if (fsc->sb->s_root) {
743                 dput(root);
744         } else {
745                 fsc->sb->s_root = root;
746                 first = 1;
747 
748                 err = ceph_fs_debugfs_init(fsc);
749                 if (err < 0)
750                         goto fail;
751         }
752 
753         if (path[0] == 0) {
754                 dget(root);
755         } else {
756                 dout("mount opening base mountpoint\n");
757                 root = open_root_dentry(fsc, path, started);
758                 if (IS_ERR(root)) {
759                         err = PTR_ERR(root);
760                         goto fail;
761                 }
762         }
763 
764         fsc->mount_state = CEPH_MOUNT_MOUNTED;
765         dout("mount success\n");
766         mutex_unlock(&fsc->client->mount_mutex);
767         return root;
768 
769 out:
770         mutex_unlock(&fsc->client->mount_mutex);
771         return ERR_PTR(err);
772 
773 fail:
774         if (first) {
775                 dput(fsc->sb->s_root);
776                 fsc->sb->s_root = NULL;
777         }
778         goto out;
779 }
780 
781 static int ceph_set_super(struct super_block *s, void *data)
782 {
783         struct ceph_fs_client *fsc = data;
784         int ret;
785 
786         dout("set_super %p data %p\n", s, data);
787 
788         s->s_flags = fsc->mount_options->sb_flags;
789         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
790 
791         s->s_fs_info = fsc;
792         fsc->sb = s;
793 
794         s->s_op = &ceph_super_ops;
795         s->s_export_op = &ceph_export_ops;
796 
797         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
798 
799         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
800         if (ret != 0)
801                 goto fail;
802 
803         return ret;
804 
805 fail:
806         s->s_fs_info = NULL;
807         fsc->sb = NULL;
808         return ret;
809 }
810 
811 /*
812  * share superblock if same fs AND options
813  */
814 static int ceph_compare_super(struct super_block *sb, void *data)
815 {
816         struct ceph_fs_client *new = data;
817         struct ceph_mount_options *fsopt = new->mount_options;
818         struct ceph_options *opt = new->client->options;
819         struct ceph_fs_client *other = ceph_sb_to_client(sb);
820 
821         dout("ceph_compare_super %p\n", sb);
822 
823         if (compare_mount_options(fsopt, opt, other)) {
824                 dout("monitor(s)/mount options don't match\n");
825                 return 0;
826         }
827         if ((opt->flags & CEPH_OPT_FSID) &&
828             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
829                 dout("fsid doesn't match\n");
830                 return 0;
831         }
832         if (fsopt->sb_flags != other->mount_options->sb_flags) {
833                 dout("flags differ\n");
834                 return 0;
835         }
836         return 1;
837 }
838 
839 /*
840  * construct our own bdi so we can control readahead, etc.
841  */
842 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
843 
844 static int ceph_register_bdi(struct super_block *sb,
845                              struct ceph_fs_client *fsc)
846 {
847         int err;
848 
849         /* set ra_pages based on rasize mount option? */
850         if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
851                 fsc->backing_dev_info.ra_pages =
852                         (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
853                         >> PAGE_SHIFT;
854         else
855                 fsc->backing_dev_info.ra_pages =
856                         default_backing_dev_info.ra_pages;
857 
858         err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
859                            atomic_long_inc_return(&bdi_seq));
860         if (!err)
861                 sb->s_bdi = &fsc->backing_dev_info;
862         return err;
863 }
864 
865 static struct dentry *ceph_mount(struct file_system_type *fs_type,
866                        int flags, const char *dev_name, void *data)
867 {
868         struct super_block *sb;
869         struct ceph_fs_client *fsc;
870         struct dentry *res;
871         int err;
872         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
873         const char *path = NULL;
874         struct ceph_mount_options *fsopt = NULL;
875         struct ceph_options *opt = NULL;
876 
877         dout("ceph_mount\n");
878         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
879         if (err < 0) {
880                 res = ERR_PTR(err);
881                 goto out_final;
882         }
883 
884         /* create client (which we may/may not use) */
885         fsc = create_fs_client(fsopt, opt);
886         if (IS_ERR(fsc)) {
887                 res = ERR_CAST(fsc);
888                 destroy_mount_options(fsopt);
889                 ceph_destroy_options(opt);
890                 goto out_final;
891         }
892 
893         err = ceph_mdsc_init(fsc);
894         if (err < 0) {
895                 res = ERR_PTR(err);
896                 goto out;
897         }
898 
899         if (ceph_test_opt(fsc->client, NOSHARE))
900                 compare_super = NULL;
901         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
902         if (IS_ERR(sb)) {
903                 res = ERR_CAST(sb);
904                 goto out;
905         }
906 
907         if (ceph_sb_to_client(sb) != fsc) {
908                 ceph_mdsc_destroy(fsc);
909                 destroy_fs_client(fsc);
910                 fsc = ceph_sb_to_client(sb);
911                 dout("get_sb got existing client %p\n", fsc);
912         } else {
913                 dout("get_sb using new client %p\n", fsc);
914                 err = ceph_register_bdi(sb, fsc);
915                 if (err < 0) {
916                         res = ERR_PTR(err);
917                         goto out_splat;
918                 }
919         }
920 
921         res = ceph_real_mount(fsc, path);
922         if (IS_ERR(res))
923                 goto out_splat;
924         dout("root %p inode %p ino %llx.%llx\n", res,
925              res->d_inode, ceph_vinop(res->d_inode));
926         return res;
927 
928 out_splat:
929         ceph_mdsc_close_sessions(fsc->mdsc);
930         deactivate_locked_super(sb);
931         goto out_final;
932 
933 out:
934         ceph_mdsc_destroy(fsc);
935         destroy_fs_client(fsc);
936 out_final:
937         dout("ceph_mount fail %ld\n", PTR_ERR(res));
938         return res;
939 }
940 
941 static void ceph_kill_sb(struct super_block *s)
942 {
943         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
944         dout("kill_sb %p\n", s);
945         ceph_mdsc_pre_umount(fsc->mdsc);
946         kill_anon_super(s);    /* will call put_super after sb is r/o */
947         ceph_mdsc_destroy(fsc);
948         destroy_fs_client(fsc);
949 }
950 
951 static struct file_system_type ceph_fs_type = {
952         .owner          = THIS_MODULE,
953         .name           = "ceph",
954         .mount          = ceph_mount,
955         .kill_sb        = ceph_kill_sb,
956         .fs_flags       = FS_RENAME_DOES_D_MOVE,
957 };
958 MODULE_ALIAS_FS("ceph");
959 
960 #define _STRINGIFY(x) #x
961 #define STRINGIFY(x) _STRINGIFY(x)
962 
963 static int __init init_ceph(void)
964 {
965         int ret = init_caches();
966         if (ret)
967                 goto out;
968 
969         ceph_xattr_init();
970         ret = register_filesystem(&ceph_fs_type);
971         if (ret)
972                 goto out_icache;
973 
974         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
975 
976         return 0;
977 
978 out_icache:
979         ceph_xattr_exit();
980         destroy_caches();
981 out:
982         return ret;
983 }
984 
985 static void __exit exit_ceph(void)
986 {
987         dout("exit_ceph\n");
988         unregister_filesystem(&ceph_fs_type);
989         ceph_xattr_exit();
990         destroy_caches();
991 }
992 
993 module_init(init_ceph);
994 module_exit(exit_ceph);
995 
996 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
997 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
998 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
999 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1000 MODULE_LICENSE("GPL");
1001 

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