Merge tag 'platform-drivers-x86-v4.17-1' of git://git.infradead.org/linux-platform...
[sfrench/cifs-2.6.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         u64 data_pool;
53
54         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
55                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
56         } else {
57                 data_pool = CEPH_NOPOOL;
58         }
59
60         dout("statfs\n");
61         err = ceph_monc_do_statfs(&fsc->client->monc, data_pool, &st);
62         if (err < 0)
63                 return err;
64
65         /* fill in kstatfs */
66         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
67
68         /*
69          * express utilization in terms of large blocks to avoid
70          * overflow on 32-bit machines.
71          *
72          * NOTE: for the time being, we make bsize == frsize to humor
73          * not-yet-ancient versions of glibc that are broken.
74          * Someday, we will probably want to report a real block
75          * size...  whatever that may mean for a network file system!
76          */
77         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
78         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
79         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
80         buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
81         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
82
83         buf->f_files = le64_to_cpu(st.num_objects);
84         buf->f_ffree = -1;
85         buf->f_namelen = NAME_MAX;
86
87         /* Must convert the fsid, for consistent values across arches */
88         fsid = le64_to_cpu(*(__le64 *)(&monmap->fsid)) ^
89                le64_to_cpu(*((__le64 *)&monmap->fsid + 1));
90         buf->f_fsid.val[0] = fsid & 0xffffffff;
91         buf->f_fsid.val[1] = fsid >> 32;
92
93         return 0;
94 }
95
96
97 static int ceph_sync_fs(struct super_block *sb, int wait)
98 {
99         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
100
101         if (!wait) {
102                 dout("sync_fs (non-blocking)\n");
103                 ceph_flush_dirty_caps(fsc->mdsc);
104                 dout("sync_fs (non-blocking) done\n");
105                 return 0;
106         }
107
108         dout("sync_fs (blocking)\n");
109         ceph_osdc_sync(&fsc->client->osdc);
110         ceph_mdsc_sync(fsc->mdsc);
111         dout("sync_fs (blocking) done\n");
112         return 0;
113 }
114
115 /*
116  * mount options
117  */
118 enum {
119         Opt_wsize,
120         Opt_rsize,
121         Opt_rasize,
122         Opt_caps_wanted_delay_min,
123         Opt_caps_wanted_delay_max,
124         Opt_readdir_max_entries,
125         Opt_readdir_max_bytes,
126         Opt_congestion_kb,
127         Opt_last_int,
128         /* int args above */
129         Opt_snapdirname,
130         Opt_mds_namespace,
131         Opt_fscache_uniq,
132         Opt_last_string,
133         /* string args above */
134         Opt_dirstat,
135         Opt_nodirstat,
136         Opt_rbytes,
137         Opt_norbytes,
138         Opt_asyncreaddir,
139         Opt_noasyncreaddir,
140         Opt_dcache,
141         Opt_nodcache,
142         Opt_ino32,
143         Opt_noino32,
144         Opt_fscache,
145         Opt_nofscache,
146         Opt_poolperm,
147         Opt_nopoolperm,
148         Opt_require_active_mds,
149         Opt_norequire_active_mds,
150 #ifdef CONFIG_CEPH_FS_POSIX_ACL
151         Opt_acl,
152 #endif
153         Opt_noacl,
154 };
155
156 static match_table_t fsopt_tokens = {
157         {Opt_wsize, "wsize=%d"},
158         {Opt_rsize, "rsize=%d"},
159         {Opt_rasize, "rasize=%d"},
160         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
161         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
162         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
163         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
164         {Opt_congestion_kb, "write_congestion_kb=%d"},
165         /* int args above */
166         {Opt_snapdirname, "snapdirname=%s"},
167         {Opt_mds_namespace, "mds_namespace=%s"},
168         {Opt_fscache_uniq, "fsc=%s"},
169         /* string args above */
170         {Opt_dirstat, "dirstat"},
171         {Opt_nodirstat, "nodirstat"},
172         {Opt_rbytes, "rbytes"},
173         {Opt_norbytes, "norbytes"},
174         {Opt_asyncreaddir, "asyncreaddir"},
175         {Opt_noasyncreaddir, "noasyncreaddir"},
176         {Opt_dcache, "dcache"},
177         {Opt_nodcache, "nodcache"},
178         {Opt_ino32, "ino32"},
179         {Opt_noino32, "noino32"},
180         {Opt_fscache, "fsc"},
181         {Opt_nofscache, "nofsc"},
182         {Opt_poolperm, "poolperm"},
183         {Opt_nopoolperm, "nopoolperm"},
184         {Opt_require_active_mds, "require_active_mds"},
185         {Opt_norequire_active_mds, "norequire_active_mds"},
186 #ifdef CONFIG_CEPH_FS_POSIX_ACL
187         {Opt_acl, "acl"},
188 #endif
189         {Opt_noacl, "noacl"},
190         {-1, NULL}
191 };
192
193 static int parse_fsopt_token(char *c, void *private)
194 {
195         struct ceph_mount_options *fsopt = private;
196         substring_t argstr[MAX_OPT_ARGS];
197         int token, intval, ret;
198
199         token = match_token((char *)c, fsopt_tokens, argstr);
200         if (token < 0)
201                 return -EINVAL;
202
203         if (token < Opt_last_int) {
204                 ret = match_int(&argstr[0], &intval);
205                 if (ret < 0) {
206                         pr_err("bad mount option arg (not int) "
207                                "at '%s'\n", c);
208                         return ret;
209                 }
210                 dout("got int token %d val %d\n", token, intval);
211         } else if (token > Opt_last_int && token < Opt_last_string) {
212                 dout("got string token %d val %s\n", token,
213                      argstr[0].from);
214         } else {
215                 dout("got token %d\n", token);
216         }
217
218         switch (token) {
219         case Opt_snapdirname:
220                 kfree(fsopt->snapdir_name);
221                 fsopt->snapdir_name = kstrndup(argstr[0].from,
222                                                argstr[0].to-argstr[0].from,
223                                                GFP_KERNEL);
224                 if (!fsopt->snapdir_name)
225                         return -ENOMEM;
226                 break;
227         case Opt_mds_namespace:
228                 kfree(fsopt->mds_namespace);
229                 fsopt->mds_namespace = kstrndup(argstr[0].from,
230                                                 argstr[0].to-argstr[0].from,
231                                                 GFP_KERNEL);
232                 if (!fsopt->mds_namespace)
233                         return -ENOMEM;
234                 break;
235         case Opt_fscache_uniq:
236                 kfree(fsopt->fscache_uniq);
237                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
238                                                argstr[0].to-argstr[0].from,
239                                                GFP_KERNEL);
240                 if (!fsopt->fscache_uniq)
241                         return -ENOMEM;
242                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
243                 break;
244                 /* misc */
245         case Opt_wsize:
246                 if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
247                         return -EINVAL;
248                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
249                 break;
250         case Opt_rsize:
251                 if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
252                         return -EINVAL;
253                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
254                 break;
255         case Opt_rasize:
256                 if (intval < 0)
257                         return -EINVAL;
258                 fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE);
259                 break;
260         case Opt_caps_wanted_delay_min:
261                 if (intval < 1)
262                         return -EINVAL;
263                 fsopt->caps_wanted_delay_min = intval;
264                 break;
265         case Opt_caps_wanted_delay_max:
266                 if (intval < 1)
267                         return -EINVAL;
268                 fsopt->caps_wanted_delay_max = intval;
269                 break;
270         case Opt_readdir_max_entries:
271                 if (intval < 1)
272                         return -EINVAL;
273                 fsopt->max_readdir = intval;
274                 break;
275         case Opt_readdir_max_bytes:
276                 if (intval < PAGE_SIZE && intval != 0)
277                         return -EINVAL;
278                 fsopt->max_readdir_bytes = intval;
279                 break;
280         case Opt_congestion_kb:
281                 if (intval < 1024) /* at least 1M */
282                         return -EINVAL;
283                 fsopt->congestion_kb = intval;
284                 break;
285         case Opt_dirstat:
286                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
287                 break;
288         case Opt_nodirstat:
289                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
290                 break;
291         case Opt_rbytes:
292                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
293                 break;
294         case Opt_norbytes:
295                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
296                 break;
297         case Opt_asyncreaddir:
298                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
299                 break;
300         case Opt_noasyncreaddir:
301                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
302                 break;
303         case Opt_dcache:
304                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
305                 break;
306         case Opt_nodcache:
307                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
308                 break;
309         case Opt_ino32:
310                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
311                 break;
312         case Opt_noino32:
313                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
314                 break;
315         case Opt_fscache:
316                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
317                 break;
318         case Opt_nofscache:
319                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
320                 break;
321         case Opt_poolperm:
322                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
323                 printk ("pool perm");
324                 break;
325         case Opt_nopoolperm:
326                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
327                 break;
328         case Opt_require_active_mds:
329                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
330                 break;
331         case Opt_norequire_active_mds:
332                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
333                 break;
334 #ifdef CONFIG_CEPH_FS_POSIX_ACL
335         case Opt_acl:
336                 fsopt->sb_flags |= SB_POSIXACL;
337                 break;
338 #endif
339         case Opt_noacl:
340                 fsopt->sb_flags &= ~SB_POSIXACL;
341                 break;
342         default:
343                 BUG_ON(token);
344         }
345         return 0;
346 }
347
348 static void destroy_mount_options(struct ceph_mount_options *args)
349 {
350         dout("destroy_mount_options %p\n", args);
351         kfree(args->snapdir_name);
352         kfree(args->mds_namespace);
353         kfree(args->server_path);
354         kfree(args->fscache_uniq);
355         kfree(args);
356 }
357
358 static int strcmp_null(const char *s1, const char *s2)
359 {
360         if (!s1 && !s2)
361                 return 0;
362         if (s1 && !s2)
363                 return -1;
364         if (!s1 && s2)
365                 return 1;
366         return strcmp(s1, s2);
367 }
368
369 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
370                                  struct ceph_options *new_opt,
371                                  struct ceph_fs_client *fsc)
372 {
373         struct ceph_mount_options *fsopt1 = new_fsopt;
374         struct ceph_mount_options *fsopt2 = fsc->mount_options;
375         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
376         int ret;
377
378         ret = memcmp(fsopt1, fsopt2, ofs);
379         if (ret)
380                 return ret;
381
382         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
383         if (ret)
384                 return ret;
385         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
386         if (ret)
387                 return ret;
388         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
389         if (ret)
390                 return ret;
391         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
392         if (ret)
393                 return ret;
394
395         return ceph_compare_options(new_opt, fsc->client);
396 }
397
398 static int parse_mount_options(struct ceph_mount_options **pfsopt,
399                                struct ceph_options **popt,
400                                int flags, char *options,
401                                const char *dev_name)
402 {
403         struct ceph_mount_options *fsopt;
404         const char *dev_name_end;
405         int err;
406
407         if (!dev_name || !*dev_name)
408                 return -EINVAL;
409
410         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
411         if (!fsopt)
412                 return -ENOMEM;
413
414         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
415
416         fsopt->sb_flags = flags;
417         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
418
419         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
420         fsopt->rsize = CEPH_MAX_READ_SIZE;
421         fsopt->rasize = CEPH_RASIZE_DEFAULT;
422         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
423         if (!fsopt->snapdir_name) {
424                 err = -ENOMEM;
425                 goto out;
426         }
427
428         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
429         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
430         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
431         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
432         fsopt->congestion_kb = default_congestion_kb();
433
434         /*
435          * Distinguish the server list from the path in "dev_name".
436          * Internally we do not include the leading '/' in the path.
437          *
438          * "dev_name" will look like:
439          *     <server_spec>[,<server_spec>...]:[<path>]
440          * where
441          *     <server_spec> is <ip>[:<port>]
442          *     <path> is optional, but if present must begin with '/'
443          */
444         dev_name_end = strchr(dev_name, '/');
445         if (dev_name_end) {
446                 if (strlen(dev_name_end) > 1) {
447                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
448                         if (!fsopt->server_path) {
449                                 err = -ENOMEM;
450                                 goto out;
451                         }
452                 }
453         } else {
454                 dev_name_end = dev_name + strlen(dev_name);
455         }
456         err = -EINVAL;
457         dev_name_end--;         /* back up to ':' separator */
458         if (dev_name_end < dev_name || *dev_name_end != ':') {
459                 pr_err("device name is missing path (no : separator in %s)\n",
460                                 dev_name);
461                 goto out;
462         }
463         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
464         if (fsopt->server_path)
465                 dout("server path '%s'\n", fsopt->server_path);
466
467         *popt = ceph_parse_options(options, dev_name, dev_name_end,
468                                  parse_fsopt_token, (void *)fsopt);
469         if (IS_ERR(*popt)) {
470                 err = PTR_ERR(*popt);
471                 goto out;
472         }
473
474         /* success */
475         *pfsopt = fsopt;
476         return 0;
477
478 out:
479         destroy_mount_options(fsopt);
480         return err;
481 }
482
483 /**
484  * ceph_show_options - Show mount options in /proc/mounts
485  * @m: seq_file to write to
486  * @root: root of that (sub)tree
487  */
488 static int ceph_show_options(struct seq_file *m, struct dentry *root)
489 {
490         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
491         struct ceph_mount_options *fsopt = fsc->mount_options;
492         size_t pos;
493         int ret;
494
495         /* a comma between MNT/MS and client options */
496         seq_putc(m, ',');
497         pos = m->count;
498
499         ret = ceph_print_client_options(m, fsc->client);
500         if (ret)
501                 return ret;
502
503         /* retract our comma if no client options */
504         if (m->count == pos)
505                 m->count--;
506
507         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
508                 seq_puts(m, ",dirstat");
509         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
510                 seq_puts(m, ",rbytes");
511         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
512                 seq_puts(m, ",noasyncreaddir");
513         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
514                 seq_puts(m, ",nodcache");
515         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
516                 if (fsopt->fscache_uniq)
517                         seq_printf(m, ",fsc=%s", fsopt->fscache_uniq);
518                 else
519                         seq_puts(m, ",fsc");
520         }
521         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
522                 seq_puts(m, ",nopoolperm");
523
524 #ifdef CONFIG_CEPH_FS_POSIX_ACL
525         if (fsopt->sb_flags & SB_POSIXACL)
526                 seq_puts(m, ",acl");
527         else
528                 seq_puts(m, ",noacl");
529 #endif
530
531         if (fsopt->mds_namespace)
532                 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
533         if (fsopt->wsize)
534                 seq_printf(m, ",wsize=%d", fsopt->wsize);
535         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
536                 seq_printf(m, ",rsize=%d", fsopt->rsize);
537         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
538                 seq_printf(m, ",rasize=%d", fsopt->rasize);
539         if (fsopt->congestion_kb != default_congestion_kb())
540                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
541         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
542                 seq_printf(m, ",caps_wanted_delay_min=%d",
543                          fsopt->caps_wanted_delay_min);
544         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
545                 seq_printf(m, ",caps_wanted_delay_max=%d",
546                            fsopt->caps_wanted_delay_max);
547         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
548                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
549         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
550                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
551         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
552                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
553
554         return 0;
555 }
556
557 /*
558  * handle any mon messages the standard library doesn't understand.
559  * return error if we don't either.
560  */
561 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
562 {
563         struct ceph_fs_client *fsc = client->private;
564         int type = le16_to_cpu(msg->hdr.type);
565
566         switch (type) {
567         case CEPH_MSG_MDS_MAP:
568                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
569                 return 0;
570         case CEPH_MSG_FS_MAP_USER:
571                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
572                 return 0;
573         default:
574                 return -1;
575         }
576 }
577
578 /*
579  * create a new fs client
580  */
581 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
582                                         struct ceph_options *opt)
583 {
584         struct ceph_fs_client *fsc;
585         int page_count;
586         size_t size;
587         int err = -ENOMEM;
588
589         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
590         if (!fsc)
591                 return ERR_PTR(-ENOMEM);
592
593         fsc->client = ceph_create_client(opt, fsc);
594         if (IS_ERR(fsc->client)) {
595                 err = PTR_ERR(fsc->client);
596                 goto fail;
597         }
598         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
599
600         if (!fsopt->mds_namespace) {
601                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
602                                    0, true);
603         } else {
604                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
605                                    0, false);
606         }
607
608         fsc->mount_options = fsopt;
609
610         fsc->sb = NULL;
611         fsc->mount_state = CEPH_MOUNT_MOUNTING;
612
613         atomic_long_set(&fsc->writeback_count, 0);
614
615         err = -ENOMEM;
616         /*
617          * The number of concurrent works can be high but they don't need
618          * to be processed in parallel, limit concurrency.
619          */
620         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
621         if (!fsc->wb_wq)
622                 goto fail_client;
623         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
624         if (!fsc->pg_inv_wq)
625                 goto fail_wb_wq;
626         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
627         if (!fsc->trunc_wq)
628                 goto fail_pg_inv_wq;
629
630         /* set up mempools */
631         err = -ENOMEM;
632         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
633         size = sizeof (struct page *) * (page_count ? page_count : 1);
634         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
635         if (!fsc->wb_pagevec_pool)
636                 goto fail_trunc_wq;
637
638         /* caps */
639         fsc->min_caps = fsopt->max_readdir;
640
641         return fsc;
642
643 fail_trunc_wq:
644         destroy_workqueue(fsc->trunc_wq);
645 fail_pg_inv_wq:
646         destroy_workqueue(fsc->pg_inv_wq);
647 fail_wb_wq:
648         destroy_workqueue(fsc->wb_wq);
649 fail_client:
650         ceph_destroy_client(fsc->client);
651 fail:
652         kfree(fsc);
653         return ERR_PTR(err);
654 }
655
656 static void destroy_fs_client(struct ceph_fs_client *fsc)
657 {
658         dout("destroy_fs_client %p\n", fsc);
659
660         destroy_workqueue(fsc->wb_wq);
661         destroy_workqueue(fsc->pg_inv_wq);
662         destroy_workqueue(fsc->trunc_wq);
663
664         mempool_destroy(fsc->wb_pagevec_pool);
665
666         destroy_mount_options(fsc->mount_options);
667
668         ceph_destroy_client(fsc->client);
669
670         kfree(fsc);
671         dout("destroy_fs_client %p done\n", fsc);
672 }
673
674 /*
675  * caches
676  */
677 struct kmem_cache *ceph_inode_cachep;
678 struct kmem_cache *ceph_cap_cachep;
679 struct kmem_cache *ceph_cap_flush_cachep;
680 struct kmem_cache *ceph_dentry_cachep;
681 struct kmem_cache *ceph_file_cachep;
682
683 static void ceph_inode_init_once(void *foo)
684 {
685         struct ceph_inode_info *ci = foo;
686         inode_init_once(&ci->vfs_inode);
687 }
688
689 static int __init init_caches(void)
690 {
691         int error = -ENOMEM;
692
693         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
694                                       sizeof(struct ceph_inode_info),
695                                       __alignof__(struct ceph_inode_info),
696                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
697                                       SLAB_ACCOUNT, ceph_inode_init_once);
698         if (!ceph_inode_cachep)
699                 return -ENOMEM;
700
701         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
702                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
703         if (!ceph_cap_cachep)
704                 goto bad_cap;
705         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
706                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
707         if (!ceph_cap_flush_cachep)
708                 goto bad_cap_flush;
709
710         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
711                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
712         if (!ceph_dentry_cachep)
713                 goto bad_dentry;
714
715         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
716         if (!ceph_file_cachep)
717                 goto bad_file;
718
719         error = ceph_fscache_register();
720         if (error)
721                 goto bad_fscache;
722
723         return 0;
724
725 bad_fscache:
726         kmem_cache_destroy(ceph_file_cachep);
727 bad_file:
728         kmem_cache_destroy(ceph_dentry_cachep);
729 bad_dentry:
730         kmem_cache_destroy(ceph_cap_flush_cachep);
731 bad_cap_flush:
732         kmem_cache_destroy(ceph_cap_cachep);
733 bad_cap:
734         kmem_cache_destroy(ceph_inode_cachep);
735         return error;
736 }
737
738 static void destroy_caches(void)
739 {
740         /*
741          * Make sure all delayed rcu free inodes are flushed before we
742          * destroy cache.
743          */
744         rcu_barrier();
745
746         kmem_cache_destroy(ceph_inode_cachep);
747         kmem_cache_destroy(ceph_cap_cachep);
748         kmem_cache_destroy(ceph_cap_flush_cachep);
749         kmem_cache_destroy(ceph_dentry_cachep);
750         kmem_cache_destroy(ceph_file_cachep);
751
752         ceph_fscache_unregister();
753 }
754
755
756 /*
757  * ceph_umount_begin - initiate forced umount.  Tear down down the
758  * mount, skipping steps that may hang while waiting for server(s).
759  */
760 static void ceph_umount_begin(struct super_block *sb)
761 {
762         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
763
764         dout("ceph_umount_begin - starting forced umount\n");
765         if (!fsc)
766                 return;
767         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
768         ceph_mdsc_force_umount(fsc->mdsc);
769         return;
770 }
771
772 static const struct super_operations ceph_super_ops = {
773         .alloc_inode    = ceph_alloc_inode,
774         .destroy_inode  = ceph_destroy_inode,
775         .write_inode    = ceph_write_inode,
776         .drop_inode     = ceph_drop_inode,
777         .sync_fs        = ceph_sync_fs,
778         .put_super      = ceph_put_super,
779         .show_options   = ceph_show_options,
780         .statfs         = ceph_statfs,
781         .umount_begin   = ceph_umount_begin,
782 };
783
784 /*
785  * Bootstrap mount by opening the root directory.  Note the mount
786  * @started time from caller, and time out if this takes too long.
787  */
788 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
789                                        const char *path,
790                                        unsigned long started)
791 {
792         struct ceph_mds_client *mdsc = fsc->mdsc;
793         struct ceph_mds_request *req = NULL;
794         int err;
795         struct dentry *root;
796
797         /* open dir */
798         dout("open_root_inode opening '%s'\n", path);
799         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
800         if (IS_ERR(req))
801                 return ERR_CAST(req);
802         req->r_path1 = kstrdup(path, GFP_NOFS);
803         if (!req->r_path1) {
804                 root = ERR_PTR(-ENOMEM);
805                 goto out;
806         }
807
808         req->r_ino1.ino = CEPH_INO_ROOT;
809         req->r_ino1.snap = CEPH_NOSNAP;
810         req->r_started = started;
811         req->r_timeout = fsc->client->options->mount_timeout;
812         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
813         req->r_num_caps = 2;
814         err = ceph_mdsc_do_request(mdsc, NULL, req);
815         if (err == 0) {
816                 struct inode *inode = req->r_target_inode;
817                 req->r_target_inode = NULL;
818                 dout("open_root_inode success\n");
819                 root = d_make_root(inode);
820                 if (!root) {
821                         root = ERR_PTR(-ENOMEM);
822                         goto out;
823                 }
824                 dout("open_root_inode success, root dentry is %p\n", root);
825         } else {
826                 root = ERR_PTR(err);
827         }
828 out:
829         ceph_mdsc_put_request(req);
830         return root;
831 }
832
833
834
835
836 /*
837  * mount: join the ceph cluster, and open root directory.
838  */
839 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
840 {
841         int err;
842         unsigned long started = jiffies;  /* note the start time */
843         struct dentry *root;
844
845         dout("mount start %p\n", fsc);
846         mutex_lock(&fsc->client->mount_mutex);
847
848         if (!fsc->sb->s_root) {
849                 const char *path;
850                 err = __ceph_open_session(fsc->client, started);
851                 if (err < 0)
852                         goto out;
853
854                 /* setup fscache */
855                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
856                         err = ceph_fscache_register_fs(fsc);
857                         if (err < 0)
858                                 goto out;
859                 }
860
861                 if (!fsc->mount_options->server_path) {
862                         path = "";
863                         dout("mount opening path \\t\n");
864                 } else {
865                         path = fsc->mount_options->server_path + 1;
866                         dout("mount opening path %s\n", path);
867                 }
868
869                 err = ceph_fs_debugfs_init(fsc);
870                 if (err < 0)
871                         goto out;
872
873                 root = open_root_dentry(fsc, path, started);
874                 if (IS_ERR(root)) {
875                         err = PTR_ERR(root);
876                         goto out;
877                 }
878                 fsc->sb->s_root = dget(root);
879         } else {
880                 root = dget(fsc->sb->s_root);
881         }
882
883         fsc->mount_state = CEPH_MOUNT_MOUNTED;
884         dout("mount success\n");
885         mutex_unlock(&fsc->client->mount_mutex);
886         return root;
887
888 out:
889         mutex_unlock(&fsc->client->mount_mutex);
890         return ERR_PTR(err);
891 }
892
893 static int ceph_set_super(struct super_block *s, void *data)
894 {
895         struct ceph_fs_client *fsc = data;
896         int ret;
897
898         dout("set_super %p data %p\n", s, data);
899
900         s->s_flags = fsc->mount_options->sb_flags;
901         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
902
903         s->s_xattr = ceph_xattr_handlers;
904         s->s_fs_info = fsc;
905         fsc->sb = s;
906
907         s->s_op = &ceph_super_ops;
908         s->s_d_op = &ceph_dentry_ops;
909         s->s_export_op = &ceph_export_ops;
910
911         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
912
913         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
914         if (ret != 0)
915                 goto fail;
916
917         return ret;
918
919 fail:
920         s->s_fs_info = NULL;
921         fsc->sb = NULL;
922         return ret;
923 }
924
925 /*
926  * share superblock if same fs AND options
927  */
928 static int ceph_compare_super(struct super_block *sb, void *data)
929 {
930         struct ceph_fs_client *new = data;
931         struct ceph_mount_options *fsopt = new->mount_options;
932         struct ceph_options *opt = new->client->options;
933         struct ceph_fs_client *other = ceph_sb_to_client(sb);
934
935         dout("ceph_compare_super %p\n", sb);
936
937         if (compare_mount_options(fsopt, opt, other)) {
938                 dout("monitor(s)/mount options don't match\n");
939                 return 0;
940         }
941         if ((opt->flags & CEPH_OPT_FSID) &&
942             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
943                 dout("fsid doesn't match\n");
944                 return 0;
945         }
946         if (fsopt->sb_flags != other->mount_options->sb_flags) {
947                 dout("flags differ\n");
948                 return 0;
949         }
950         return 1;
951 }
952
953 /*
954  * construct our own bdi so we can control readahead, etc.
955  */
956 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
957
958 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
959 {
960         int err;
961
962         err = super_setup_bdi_name(sb, "ceph-%ld",
963                                    atomic_long_inc_return(&bdi_seq));
964         if (err)
965                 return err;
966
967         /* set ra_pages based on rasize mount option? */
968         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
969
970         /* set io_pages based on max osd read size */
971         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
972
973         return 0;
974 }
975
976 static struct dentry *ceph_mount(struct file_system_type *fs_type,
977                        int flags, const char *dev_name, void *data)
978 {
979         struct super_block *sb;
980         struct ceph_fs_client *fsc;
981         struct dentry *res;
982         int err;
983         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
984         struct ceph_mount_options *fsopt = NULL;
985         struct ceph_options *opt = NULL;
986
987         dout("ceph_mount\n");
988
989 #ifdef CONFIG_CEPH_FS_POSIX_ACL
990         flags |= SB_POSIXACL;
991 #endif
992         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
993         if (err < 0) {
994                 res = ERR_PTR(err);
995                 goto out_final;
996         }
997
998         /* create client (which we may/may not use) */
999         fsc = create_fs_client(fsopt, opt);
1000         if (IS_ERR(fsc)) {
1001                 res = ERR_CAST(fsc);
1002                 destroy_mount_options(fsopt);
1003                 ceph_destroy_options(opt);
1004                 goto out_final;
1005         }
1006
1007         err = ceph_mdsc_init(fsc);
1008         if (err < 0) {
1009                 res = ERR_PTR(err);
1010                 goto out;
1011         }
1012
1013         if (ceph_test_opt(fsc->client, NOSHARE))
1014                 compare_super = NULL;
1015         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1016         if (IS_ERR(sb)) {
1017                 res = ERR_CAST(sb);
1018                 goto out;
1019         }
1020
1021         if (ceph_sb_to_client(sb) != fsc) {
1022                 ceph_mdsc_destroy(fsc);
1023                 destroy_fs_client(fsc);
1024                 fsc = ceph_sb_to_client(sb);
1025                 dout("get_sb got existing client %p\n", fsc);
1026         } else {
1027                 dout("get_sb using new client %p\n", fsc);
1028                 err = ceph_setup_bdi(sb, fsc);
1029                 if (err < 0) {
1030                         res = ERR_PTR(err);
1031                         goto out_splat;
1032                 }
1033         }
1034
1035         res = ceph_real_mount(fsc);
1036         if (IS_ERR(res))
1037                 goto out_splat;
1038         dout("root %p inode %p ino %llx.%llx\n", res,
1039              d_inode(res), ceph_vinop(d_inode(res)));
1040         return res;
1041
1042 out_splat:
1043         ceph_mdsc_close_sessions(fsc->mdsc);
1044         deactivate_locked_super(sb);
1045         goto out_final;
1046
1047 out:
1048         ceph_mdsc_destroy(fsc);
1049         destroy_fs_client(fsc);
1050 out_final:
1051         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1052         return res;
1053 }
1054
1055 static void ceph_kill_sb(struct super_block *s)
1056 {
1057         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1058         dev_t dev = s->s_dev;
1059
1060         dout("kill_sb %p\n", s);
1061
1062         ceph_mdsc_pre_umount(fsc->mdsc);
1063         generic_shutdown_super(s);
1064
1065         fsc->client->extra_mon_dispatch = NULL;
1066         ceph_fs_debugfs_cleanup(fsc);
1067
1068         ceph_fscache_unregister_fs(fsc);
1069
1070         ceph_mdsc_destroy(fsc);
1071
1072         destroy_fs_client(fsc);
1073         free_anon_bdev(dev);
1074 }
1075
1076 static struct file_system_type ceph_fs_type = {
1077         .owner          = THIS_MODULE,
1078         .name           = "ceph",
1079         .mount          = ceph_mount,
1080         .kill_sb        = ceph_kill_sb,
1081         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1082 };
1083 MODULE_ALIAS_FS("ceph");
1084
1085 static int __init init_ceph(void)
1086 {
1087         int ret = init_caches();
1088         if (ret)
1089                 goto out;
1090
1091         ceph_flock_init();
1092         ceph_xattr_init();
1093         ret = register_filesystem(&ceph_fs_type);
1094         if (ret)
1095                 goto out_xattr;
1096
1097         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1098
1099         return 0;
1100
1101 out_xattr:
1102         ceph_xattr_exit();
1103         destroy_caches();
1104 out:
1105         return ret;
1106 }
1107
1108 static void __exit exit_ceph(void)
1109 {
1110         dout("exit_ceph\n");
1111         unregister_filesystem(&ceph_fs_type);
1112         ceph_xattr_exit();
1113         destroy_caches();
1114 }
1115
1116 module_init(init_ceph);
1117 module_exit(exit_ceph);
1118
1119 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1120 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1121 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1122 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1123 MODULE_LICENSE("GPL");