Merge tag 'ceph-for-4.17-rc1' of git://github.com/ceph/ceph-client
[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
80         /*
81          * By default use root quota for stats; fallback to overall filesystem
82          * usage if using 'noquotadf' mount option or if the root dir doesn't
83          * have max_bytes quota set.
84          */
85         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
86             !ceph_quota_update_statfs(fsc, buf)) {
87                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
88                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
89                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
90         }
91
92         buf->f_files = le64_to_cpu(st.num_objects);
93         buf->f_ffree = -1;
94         buf->f_namelen = NAME_MAX;
95
96         /* Must convert the fsid, for consistent values across arches */
97         fsid = le64_to_cpu(*(__le64 *)(&monmap->fsid)) ^
98                le64_to_cpu(*((__le64 *)&monmap->fsid + 1));
99         buf->f_fsid.val[0] = fsid & 0xffffffff;
100         buf->f_fsid.val[1] = fsid >> 32;
101
102         return 0;
103 }
104
105
106 static int ceph_sync_fs(struct super_block *sb, int wait)
107 {
108         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
109
110         if (!wait) {
111                 dout("sync_fs (non-blocking)\n");
112                 ceph_flush_dirty_caps(fsc->mdsc);
113                 dout("sync_fs (non-blocking) done\n");
114                 return 0;
115         }
116
117         dout("sync_fs (blocking)\n");
118         ceph_osdc_sync(&fsc->client->osdc);
119         ceph_mdsc_sync(fsc->mdsc);
120         dout("sync_fs (blocking) done\n");
121         return 0;
122 }
123
124 /*
125  * mount options
126  */
127 enum {
128         Opt_wsize,
129         Opt_rsize,
130         Opt_rasize,
131         Opt_caps_wanted_delay_min,
132         Opt_caps_wanted_delay_max,
133         Opt_readdir_max_entries,
134         Opt_readdir_max_bytes,
135         Opt_congestion_kb,
136         Opt_last_int,
137         /* int args above */
138         Opt_snapdirname,
139         Opt_mds_namespace,
140         Opt_fscache_uniq,
141         Opt_last_string,
142         /* string args above */
143         Opt_dirstat,
144         Opt_nodirstat,
145         Opt_rbytes,
146         Opt_norbytes,
147         Opt_asyncreaddir,
148         Opt_noasyncreaddir,
149         Opt_dcache,
150         Opt_nodcache,
151         Opt_ino32,
152         Opt_noino32,
153         Opt_fscache,
154         Opt_nofscache,
155         Opt_poolperm,
156         Opt_nopoolperm,
157         Opt_require_active_mds,
158         Opt_norequire_active_mds,
159 #ifdef CONFIG_CEPH_FS_POSIX_ACL
160         Opt_acl,
161 #endif
162         Opt_noacl,
163         Opt_quotadf,
164         Opt_noquotadf,
165 };
166
167 static match_table_t fsopt_tokens = {
168         {Opt_wsize, "wsize=%d"},
169         {Opt_rsize, "rsize=%d"},
170         {Opt_rasize, "rasize=%d"},
171         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
172         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
173         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
174         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
175         {Opt_congestion_kb, "write_congestion_kb=%d"},
176         /* int args above */
177         {Opt_snapdirname, "snapdirname=%s"},
178         {Opt_mds_namespace, "mds_namespace=%s"},
179         {Opt_fscache_uniq, "fsc=%s"},
180         /* string args above */
181         {Opt_dirstat, "dirstat"},
182         {Opt_nodirstat, "nodirstat"},
183         {Opt_rbytes, "rbytes"},
184         {Opt_norbytes, "norbytes"},
185         {Opt_asyncreaddir, "asyncreaddir"},
186         {Opt_noasyncreaddir, "noasyncreaddir"},
187         {Opt_dcache, "dcache"},
188         {Opt_nodcache, "nodcache"},
189         {Opt_ino32, "ino32"},
190         {Opt_noino32, "noino32"},
191         {Opt_fscache, "fsc"},
192         {Opt_nofscache, "nofsc"},
193         {Opt_poolperm, "poolperm"},
194         {Opt_nopoolperm, "nopoolperm"},
195         {Opt_require_active_mds, "require_active_mds"},
196         {Opt_norequire_active_mds, "norequire_active_mds"},
197 #ifdef CONFIG_CEPH_FS_POSIX_ACL
198         {Opt_acl, "acl"},
199 #endif
200         {Opt_noacl, "noacl"},
201         {Opt_quotadf, "quotadf"},
202         {Opt_noquotadf, "noquotadf"},
203         {-1, NULL}
204 };
205
206 static int parse_fsopt_token(char *c, void *private)
207 {
208         struct ceph_mount_options *fsopt = private;
209         substring_t argstr[MAX_OPT_ARGS];
210         int token, intval, ret;
211
212         token = match_token((char *)c, fsopt_tokens, argstr);
213         if (token < 0)
214                 return -EINVAL;
215
216         if (token < Opt_last_int) {
217                 ret = match_int(&argstr[0], &intval);
218                 if (ret < 0) {
219                         pr_err("bad mount option arg (not int) "
220                                "at '%s'\n", c);
221                         return ret;
222                 }
223                 dout("got int token %d val %d\n", token, intval);
224         } else if (token > Opt_last_int && token < Opt_last_string) {
225                 dout("got string token %d val %s\n", token,
226                      argstr[0].from);
227         } else {
228                 dout("got token %d\n", token);
229         }
230
231         switch (token) {
232         case Opt_snapdirname:
233                 kfree(fsopt->snapdir_name);
234                 fsopt->snapdir_name = kstrndup(argstr[0].from,
235                                                argstr[0].to-argstr[0].from,
236                                                GFP_KERNEL);
237                 if (!fsopt->snapdir_name)
238                         return -ENOMEM;
239                 break;
240         case Opt_mds_namespace:
241                 kfree(fsopt->mds_namespace);
242                 fsopt->mds_namespace = kstrndup(argstr[0].from,
243                                                 argstr[0].to-argstr[0].from,
244                                                 GFP_KERNEL);
245                 if (!fsopt->mds_namespace)
246                         return -ENOMEM;
247                 break;
248         case Opt_fscache_uniq:
249                 kfree(fsopt->fscache_uniq);
250                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
251                                                argstr[0].to-argstr[0].from,
252                                                GFP_KERNEL);
253                 if (!fsopt->fscache_uniq)
254                         return -ENOMEM;
255                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
256                 break;
257                 /* misc */
258         case Opt_wsize:
259                 if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
260                         return -EINVAL;
261                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
262                 break;
263         case Opt_rsize:
264                 if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
265                         return -EINVAL;
266                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
267                 break;
268         case Opt_rasize:
269                 if (intval < 0)
270                         return -EINVAL;
271                 fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE);
272                 break;
273         case Opt_caps_wanted_delay_min:
274                 if (intval < 1)
275                         return -EINVAL;
276                 fsopt->caps_wanted_delay_min = intval;
277                 break;
278         case Opt_caps_wanted_delay_max:
279                 if (intval < 1)
280                         return -EINVAL;
281                 fsopt->caps_wanted_delay_max = intval;
282                 break;
283         case Opt_readdir_max_entries:
284                 if (intval < 1)
285                         return -EINVAL;
286                 fsopt->max_readdir = intval;
287                 break;
288         case Opt_readdir_max_bytes:
289                 if (intval < PAGE_SIZE && intval != 0)
290                         return -EINVAL;
291                 fsopt->max_readdir_bytes = intval;
292                 break;
293         case Opt_congestion_kb:
294                 if (intval < 1024) /* at least 1M */
295                         return -EINVAL;
296                 fsopt->congestion_kb = intval;
297                 break;
298         case Opt_dirstat:
299                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
300                 break;
301         case Opt_nodirstat:
302                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
303                 break;
304         case Opt_rbytes:
305                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
306                 break;
307         case Opt_norbytes:
308                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
309                 break;
310         case Opt_asyncreaddir:
311                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
312                 break;
313         case Opt_noasyncreaddir:
314                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
315                 break;
316         case Opt_dcache:
317                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
318                 break;
319         case Opt_nodcache:
320                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
321                 break;
322         case Opt_ino32:
323                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
324                 break;
325         case Opt_noino32:
326                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
327                 break;
328         case Opt_fscache:
329                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
330                 kfree(fsopt->fscache_uniq);
331                 fsopt->fscache_uniq = NULL;
332                 break;
333         case Opt_nofscache:
334                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
335                 kfree(fsopt->fscache_uniq);
336                 fsopt->fscache_uniq = NULL;
337                 break;
338         case Opt_poolperm:
339                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
340                 break;
341         case Opt_nopoolperm:
342                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
343                 break;
344         case Opt_require_active_mds:
345                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
346                 break;
347         case Opt_norequire_active_mds:
348                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
349                 break;
350         case Opt_quotadf:
351                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
352                 break;
353         case Opt_noquotadf:
354                 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
355                 break;
356 #ifdef CONFIG_CEPH_FS_POSIX_ACL
357         case Opt_acl:
358                 fsopt->sb_flags |= SB_POSIXACL;
359                 break;
360 #endif
361         case Opt_noacl:
362                 fsopt->sb_flags &= ~SB_POSIXACL;
363                 break;
364         default:
365                 BUG_ON(token);
366         }
367         return 0;
368 }
369
370 static void destroy_mount_options(struct ceph_mount_options *args)
371 {
372         dout("destroy_mount_options %p\n", args);
373         kfree(args->snapdir_name);
374         kfree(args->mds_namespace);
375         kfree(args->server_path);
376         kfree(args->fscache_uniq);
377         kfree(args);
378 }
379
380 static int strcmp_null(const char *s1, const char *s2)
381 {
382         if (!s1 && !s2)
383                 return 0;
384         if (s1 && !s2)
385                 return -1;
386         if (!s1 && s2)
387                 return 1;
388         return strcmp(s1, s2);
389 }
390
391 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
392                                  struct ceph_options *new_opt,
393                                  struct ceph_fs_client *fsc)
394 {
395         struct ceph_mount_options *fsopt1 = new_fsopt;
396         struct ceph_mount_options *fsopt2 = fsc->mount_options;
397         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
398         int ret;
399
400         ret = memcmp(fsopt1, fsopt2, ofs);
401         if (ret)
402                 return ret;
403
404         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
405         if (ret)
406                 return ret;
407         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
408         if (ret)
409                 return ret;
410         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
411         if (ret)
412                 return ret;
413         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
414         if (ret)
415                 return ret;
416
417         return ceph_compare_options(new_opt, fsc->client);
418 }
419
420 static int parse_mount_options(struct ceph_mount_options **pfsopt,
421                                struct ceph_options **popt,
422                                int flags, char *options,
423                                const char *dev_name)
424 {
425         struct ceph_mount_options *fsopt;
426         const char *dev_name_end;
427         int err;
428
429         if (!dev_name || !*dev_name)
430                 return -EINVAL;
431
432         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
433         if (!fsopt)
434                 return -ENOMEM;
435
436         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
437
438         fsopt->sb_flags = flags;
439         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
440
441         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
442         fsopt->rsize = CEPH_MAX_READ_SIZE;
443         fsopt->rasize = CEPH_RASIZE_DEFAULT;
444         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
445         if (!fsopt->snapdir_name) {
446                 err = -ENOMEM;
447                 goto out;
448         }
449
450         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
451         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
452         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
453         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
454         fsopt->congestion_kb = default_congestion_kb();
455
456         /*
457          * Distinguish the server list from the path in "dev_name".
458          * Internally we do not include the leading '/' in the path.
459          *
460          * "dev_name" will look like:
461          *     <server_spec>[,<server_spec>...]:[<path>]
462          * where
463          *     <server_spec> is <ip>[:<port>]
464          *     <path> is optional, but if present must begin with '/'
465          */
466         dev_name_end = strchr(dev_name, '/');
467         if (dev_name_end) {
468                 if (strlen(dev_name_end) > 1) {
469                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
470                         if (!fsopt->server_path) {
471                                 err = -ENOMEM;
472                                 goto out;
473                         }
474                 }
475         } else {
476                 dev_name_end = dev_name + strlen(dev_name);
477         }
478         err = -EINVAL;
479         dev_name_end--;         /* back up to ':' separator */
480         if (dev_name_end < dev_name || *dev_name_end != ':') {
481                 pr_err("device name is missing path (no : separator in %s)\n",
482                                 dev_name);
483                 goto out;
484         }
485         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
486         if (fsopt->server_path)
487                 dout("server path '%s'\n", fsopt->server_path);
488
489         *popt = ceph_parse_options(options, dev_name, dev_name_end,
490                                  parse_fsopt_token, (void *)fsopt);
491         if (IS_ERR(*popt)) {
492                 err = PTR_ERR(*popt);
493                 goto out;
494         }
495
496         /* success */
497         *pfsopt = fsopt;
498         return 0;
499
500 out:
501         destroy_mount_options(fsopt);
502         return err;
503 }
504
505 /**
506  * ceph_show_options - Show mount options in /proc/mounts
507  * @m: seq_file to write to
508  * @root: root of that (sub)tree
509  */
510 static int ceph_show_options(struct seq_file *m, struct dentry *root)
511 {
512         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
513         struct ceph_mount_options *fsopt = fsc->mount_options;
514         size_t pos;
515         int ret;
516
517         /* a comma between MNT/MS and client options */
518         seq_putc(m, ',');
519         pos = m->count;
520
521         ret = ceph_print_client_options(m, fsc->client);
522         if (ret)
523                 return ret;
524
525         /* retract our comma if no client options */
526         if (m->count == pos)
527                 m->count--;
528
529         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
530                 seq_puts(m, ",dirstat");
531         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
532                 seq_puts(m, ",rbytes");
533         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
534                 seq_puts(m, ",noasyncreaddir");
535         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
536                 seq_puts(m, ",nodcache");
537         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
538                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
539         }
540         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
541                 seq_puts(m, ",nopoolperm");
542         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
543                 seq_puts(m, ",noquotadf");
544
545 #ifdef CONFIG_CEPH_FS_POSIX_ACL
546         if (fsopt->sb_flags & SB_POSIXACL)
547                 seq_puts(m, ",acl");
548         else
549                 seq_puts(m, ",noacl");
550 #endif
551
552         if (fsopt->mds_namespace)
553                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
554         if (fsopt->wsize)
555                 seq_printf(m, ",wsize=%d", fsopt->wsize);
556         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
557                 seq_printf(m, ",rsize=%d", fsopt->rsize);
558         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
559                 seq_printf(m, ",rasize=%d", fsopt->rasize);
560         if (fsopt->congestion_kb != default_congestion_kb())
561                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
562         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
563                 seq_printf(m, ",caps_wanted_delay_min=%d",
564                          fsopt->caps_wanted_delay_min);
565         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
566                 seq_printf(m, ",caps_wanted_delay_max=%d",
567                            fsopt->caps_wanted_delay_max);
568         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
569                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
570         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
571                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
572         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
573                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
574
575         return 0;
576 }
577
578 /*
579  * handle any mon messages the standard library doesn't understand.
580  * return error if we don't either.
581  */
582 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
583 {
584         struct ceph_fs_client *fsc = client->private;
585         int type = le16_to_cpu(msg->hdr.type);
586
587         switch (type) {
588         case CEPH_MSG_MDS_MAP:
589                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
590                 return 0;
591         case CEPH_MSG_FS_MAP_USER:
592                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
593                 return 0;
594         default:
595                 return -1;
596         }
597 }
598
599 /*
600  * create a new fs client
601  */
602 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
603                                         struct ceph_options *opt)
604 {
605         struct ceph_fs_client *fsc;
606         int page_count;
607         size_t size;
608         int err = -ENOMEM;
609
610         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
611         if (!fsc)
612                 return ERR_PTR(-ENOMEM);
613
614         fsc->client = ceph_create_client(opt, fsc);
615         if (IS_ERR(fsc->client)) {
616                 err = PTR_ERR(fsc->client);
617                 goto fail;
618         }
619         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
620
621         if (!fsopt->mds_namespace) {
622                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
623                                    0, true);
624         } else {
625                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
626                                    0, false);
627         }
628
629         fsc->mount_options = fsopt;
630
631         fsc->sb = NULL;
632         fsc->mount_state = CEPH_MOUNT_MOUNTING;
633
634         atomic_long_set(&fsc->writeback_count, 0);
635
636         err = -ENOMEM;
637         /*
638          * The number of concurrent works can be high but they don't need
639          * to be processed in parallel, limit concurrency.
640          */
641         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
642         if (!fsc->wb_wq)
643                 goto fail_client;
644         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
645         if (!fsc->pg_inv_wq)
646                 goto fail_wb_wq;
647         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
648         if (!fsc->trunc_wq)
649                 goto fail_pg_inv_wq;
650
651         /* set up mempools */
652         err = -ENOMEM;
653         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
654         size = sizeof (struct page *) * (page_count ? page_count : 1);
655         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
656         if (!fsc->wb_pagevec_pool)
657                 goto fail_trunc_wq;
658
659         /* caps */
660         fsc->min_caps = fsopt->max_readdir;
661
662         return fsc;
663
664 fail_trunc_wq:
665         destroy_workqueue(fsc->trunc_wq);
666 fail_pg_inv_wq:
667         destroy_workqueue(fsc->pg_inv_wq);
668 fail_wb_wq:
669         destroy_workqueue(fsc->wb_wq);
670 fail_client:
671         ceph_destroy_client(fsc->client);
672 fail:
673         kfree(fsc);
674         return ERR_PTR(err);
675 }
676
677 static void destroy_fs_client(struct ceph_fs_client *fsc)
678 {
679         dout("destroy_fs_client %p\n", fsc);
680
681         destroy_workqueue(fsc->wb_wq);
682         destroy_workqueue(fsc->pg_inv_wq);
683         destroy_workqueue(fsc->trunc_wq);
684
685         mempool_destroy(fsc->wb_pagevec_pool);
686
687         destroy_mount_options(fsc->mount_options);
688
689         ceph_destroy_client(fsc->client);
690
691         kfree(fsc);
692         dout("destroy_fs_client %p done\n", fsc);
693 }
694
695 /*
696  * caches
697  */
698 struct kmem_cache *ceph_inode_cachep;
699 struct kmem_cache *ceph_cap_cachep;
700 struct kmem_cache *ceph_cap_flush_cachep;
701 struct kmem_cache *ceph_dentry_cachep;
702 struct kmem_cache *ceph_file_cachep;
703 struct kmem_cache *ceph_dir_file_cachep;
704
705 static void ceph_inode_init_once(void *foo)
706 {
707         struct ceph_inode_info *ci = foo;
708         inode_init_once(&ci->vfs_inode);
709 }
710
711 static int __init init_caches(void)
712 {
713         int error = -ENOMEM;
714
715         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
716                                       sizeof(struct ceph_inode_info),
717                                       __alignof__(struct ceph_inode_info),
718                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
719                                       SLAB_ACCOUNT, ceph_inode_init_once);
720         if (!ceph_inode_cachep)
721                 return -ENOMEM;
722
723         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
724         if (!ceph_cap_cachep)
725                 goto bad_cap;
726         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
727                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
728         if (!ceph_cap_flush_cachep)
729                 goto bad_cap_flush;
730
731         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
732                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
733         if (!ceph_dentry_cachep)
734                 goto bad_dentry;
735
736         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
737         if (!ceph_file_cachep)
738                 goto bad_file;
739
740         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
741         if (!ceph_dir_file_cachep)
742                 goto bad_dir_file;
743
744         error = ceph_fscache_register();
745         if (error)
746                 goto bad_fscache;
747
748         return 0;
749
750 bad_fscache:
751         kmem_cache_destroy(ceph_dir_file_cachep);
752 bad_dir_file:
753         kmem_cache_destroy(ceph_file_cachep);
754 bad_file:
755         kmem_cache_destroy(ceph_dentry_cachep);
756 bad_dentry:
757         kmem_cache_destroy(ceph_cap_flush_cachep);
758 bad_cap_flush:
759         kmem_cache_destroy(ceph_cap_cachep);
760 bad_cap:
761         kmem_cache_destroy(ceph_inode_cachep);
762         return error;
763 }
764
765 static void destroy_caches(void)
766 {
767         /*
768          * Make sure all delayed rcu free inodes are flushed before we
769          * destroy cache.
770          */
771         rcu_barrier();
772
773         kmem_cache_destroy(ceph_inode_cachep);
774         kmem_cache_destroy(ceph_cap_cachep);
775         kmem_cache_destroy(ceph_cap_flush_cachep);
776         kmem_cache_destroy(ceph_dentry_cachep);
777         kmem_cache_destroy(ceph_file_cachep);
778         kmem_cache_destroy(ceph_dir_file_cachep);
779
780         ceph_fscache_unregister();
781 }
782
783
784 /*
785  * ceph_umount_begin - initiate forced umount.  Tear down down the
786  * mount, skipping steps that may hang while waiting for server(s).
787  */
788 static void ceph_umount_begin(struct super_block *sb)
789 {
790         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
791
792         dout("ceph_umount_begin - starting forced umount\n");
793         if (!fsc)
794                 return;
795         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
796         ceph_mdsc_force_umount(fsc->mdsc);
797         return;
798 }
799
800 static const struct super_operations ceph_super_ops = {
801         .alloc_inode    = ceph_alloc_inode,
802         .destroy_inode  = ceph_destroy_inode,
803         .write_inode    = ceph_write_inode,
804         .drop_inode     = ceph_drop_inode,
805         .sync_fs        = ceph_sync_fs,
806         .put_super      = ceph_put_super,
807         .show_options   = ceph_show_options,
808         .statfs         = ceph_statfs,
809         .umount_begin   = ceph_umount_begin,
810 };
811
812 /*
813  * Bootstrap mount by opening the root directory.  Note the mount
814  * @started time from caller, and time out if this takes too long.
815  */
816 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
817                                        const char *path,
818                                        unsigned long started)
819 {
820         struct ceph_mds_client *mdsc = fsc->mdsc;
821         struct ceph_mds_request *req = NULL;
822         int err;
823         struct dentry *root;
824
825         /* open dir */
826         dout("open_root_inode opening '%s'\n", path);
827         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
828         if (IS_ERR(req))
829                 return ERR_CAST(req);
830         req->r_path1 = kstrdup(path, GFP_NOFS);
831         if (!req->r_path1) {
832                 root = ERR_PTR(-ENOMEM);
833                 goto out;
834         }
835
836         req->r_ino1.ino = CEPH_INO_ROOT;
837         req->r_ino1.snap = CEPH_NOSNAP;
838         req->r_started = started;
839         req->r_timeout = fsc->client->options->mount_timeout;
840         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
841         req->r_num_caps = 2;
842         err = ceph_mdsc_do_request(mdsc, NULL, req);
843         if (err == 0) {
844                 struct inode *inode = req->r_target_inode;
845                 req->r_target_inode = NULL;
846                 dout("open_root_inode success\n");
847                 root = d_make_root(inode);
848                 if (!root) {
849                         root = ERR_PTR(-ENOMEM);
850                         goto out;
851                 }
852                 dout("open_root_inode success, root dentry is %p\n", root);
853         } else {
854                 root = ERR_PTR(err);
855         }
856 out:
857         ceph_mdsc_put_request(req);
858         return root;
859 }
860
861
862
863
864 /*
865  * mount: join the ceph cluster, and open root directory.
866  */
867 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
868 {
869         int err;
870         unsigned long started = jiffies;  /* note the start time */
871         struct dentry *root;
872
873         dout("mount start %p\n", fsc);
874         mutex_lock(&fsc->client->mount_mutex);
875
876         if (!fsc->sb->s_root) {
877                 const char *path;
878                 err = __ceph_open_session(fsc->client, started);
879                 if (err < 0)
880                         goto out;
881
882                 /* setup fscache */
883                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
884                         err = ceph_fscache_register_fs(fsc);
885                         if (err < 0)
886                                 goto out;
887                 }
888
889                 if (!fsc->mount_options->server_path) {
890                         path = "";
891                         dout("mount opening path \\t\n");
892                 } else {
893                         path = fsc->mount_options->server_path + 1;
894                         dout("mount opening path %s\n", path);
895                 }
896
897                 err = ceph_fs_debugfs_init(fsc);
898                 if (err < 0)
899                         goto out;
900
901                 root = open_root_dentry(fsc, path, started);
902                 if (IS_ERR(root)) {
903                         err = PTR_ERR(root);
904                         goto out;
905                 }
906                 fsc->sb->s_root = dget(root);
907         } else {
908                 root = dget(fsc->sb->s_root);
909         }
910
911         fsc->mount_state = CEPH_MOUNT_MOUNTED;
912         dout("mount success\n");
913         mutex_unlock(&fsc->client->mount_mutex);
914         return root;
915
916 out:
917         mutex_unlock(&fsc->client->mount_mutex);
918         return ERR_PTR(err);
919 }
920
921 static int ceph_set_super(struct super_block *s, void *data)
922 {
923         struct ceph_fs_client *fsc = data;
924         int ret;
925
926         dout("set_super %p data %p\n", s, data);
927
928         s->s_flags = fsc->mount_options->sb_flags;
929         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
930
931         s->s_xattr = ceph_xattr_handlers;
932         s->s_fs_info = fsc;
933         fsc->sb = s;
934
935         s->s_op = &ceph_super_ops;
936         s->s_d_op = &ceph_dentry_ops;
937         s->s_export_op = &ceph_export_ops;
938
939         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
940
941         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
942         if (ret != 0)
943                 goto fail;
944
945         return ret;
946
947 fail:
948         s->s_fs_info = NULL;
949         fsc->sb = NULL;
950         return ret;
951 }
952
953 /*
954  * share superblock if same fs AND options
955  */
956 static int ceph_compare_super(struct super_block *sb, void *data)
957 {
958         struct ceph_fs_client *new = data;
959         struct ceph_mount_options *fsopt = new->mount_options;
960         struct ceph_options *opt = new->client->options;
961         struct ceph_fs_client *other = ceph_sb_to_client(sb);
962
963         dout("ceph_compare_super %p\n", sb);
964
965         if (compare_mount_options(fsopt, opt, other)) {
966                 dout("monitor(s)/mount options don't match\n");
967                 return 0;
968         }
969         if ((opt->flags & CEPH_OPT_FSID) &&
970             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
971                 dout("fsid doesn't match\n");
972                 return 0;
973         }
974         if (fsopt->sb_flags != other->mount_options->sb_flags) {
975                 dout("flags differ\n");
976                 return 0;
977         }
978         return 1;
979 }
980
981 /*
982  * construct our own bdi so we can control readahead, etc.
983  */
984 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
985
986 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
987 {
988         int err;
989
990         err = super_setup_bdi_name(sb, "ceph-%ld",
991                                    atomic_long_inc_return(&bdi_seq));
992         if (err)
993                 return err;
994
995         /* set ra_pages based on rasize mount option? */
996         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
997
998         /* set io_pages based on max osd read size */
999         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1000
1001         return 0;
1002 }
1003
1004 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1005                        int flags, const char *dev_name, void *data)
1006 {
1007         struct super_block *sb;
1008         struct ceph_fs_client *fsc;
1009         struct dentry *res;
1010         int err;
1011         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1012         struct ceph_mount_options *fsopt = NULL;
1013         struct ceph_options *opt = NULL;
1014
1015         dout("ceph_mount\n");
1016
1017 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1018         flags |= SB_POSIXACL;
1019 #endif
1020         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1021         if (err < 0) {
1022                 res = ERR_PTR(err);
1023                 goto out_final;
1024         }
1025
1026         /* create client (which we may/may not use) */
1027         fsc = create_fs_client(fsopt, opt);
1028         if (IS_ERR(fsc)) {
1029                 res = ERR_CAST(fsc);
1030                 destroy_mount_options(fsopt);
1031                 ceph_destroy_options(opt);
1032                 goto out_final;
1033         }
1034
1035         err = ceph_mdsc_init(fsc);
1036         if (err < 0) {
1037                 res = ERR_PTR(err);
1038                 goto out;
1039         }
1040
1041         if (ceph_test_opt(fsc->client, NOSHARE))
1042                 compare_super = NULL;
1043         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1044         if (IS_ERR(sb)) {
1045                 res = ERR_CAST(sb);
1046                 goto out;
1047         }
1048
1049         if (ceph_sb_to_client(sb) != fsc) {
1050                 ceph_mdsc_destroy(fsc);
1051                 destroy_fs_client(fsc);
1052                 fsc = ceph_sb_to_client(sb);
1053                 dout("get_sb got existing client %p\n", fsc);
1054         } else {
1055                 dout("get_sb using new client %p\n", fsc);
1056                 err = ceph_setup_bdi(sb, fsc);
1057                 if (err < 0) {
1058                         res = ERR_PTR(err);
1059                         goto out_splat;
1060                 }
1061         }
1062
1063         res = ceph_real_mount(fsc);
1064         if (IS_ERR(res))
1065                 goto out_splat;
1066         dout("root %p inode %p ino %llx.%llx\n", res,
1067              d_inode(res), ceph_vinop(d_inode(res)));
1068         return res;
1069
1070 out_splat:
1071         ceph_mdsc_close_sessions(fsc->mdsc);
1072         deactivate_locked_super(sb);
1073         goto out_final;
1074
1075 out:
1076         ceph_mdsc_destroy(fsc);
1077         destroy_fs_client(fsc);
1078 out_final:
1079         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1080         return res;
1081 }
1082
1083 static void ceph_kill_sb(struct super_block *s)
1084 {
1085         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1086         dev_t dev = s->s_dev;
1087
1088         dout("kill_sb %p\n", s);
1089
1090         ceph_mdsc_pre_umount(fsc->mdsc);
1091         generic_shutdown_super(s);
1092
1093         fsc->client->extra_mon_dispatch = NULL;
1094         ceph_fs_debugfs_cleanup(fsc);
1095
1096         ceph_fscache_unregister_fs(fsc);
1097
1098         ceph_mdsc_destroy(fsc);
1099
1100         destroy_fs_client(fsc);
1101         free_anon_bdev(dev);
1102 }
1103
1104 static struct file_system_type ceph_fs_type = {
1105         .owner          = THIS_MODULE,
1106         .name           = "ceph",
1107         .mount          = ceph_mount,
1108         .kill_sb        = ceph_kill_sb,
1109         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1110 };
1111 MODULE_ALIAS_FS("ceph");
1112
1113 static int __init init_ceph(void)
1114 {
1115         int ret = init_caches();
1116         if (ret)
1117                 goto out;
1118
1119         ceph_flock_init();
1120         ceph_xattr_init();
1121         ret = register_filesystem(&ceph_fs_type);
1122         if (ret)
1123                 goto out_xattr;
1124
1125         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1126
1127         return 0;
1128
1129 out_xattr:
1130         ceph_xattr_exit();
1131         destroy_caches();
1132 out:
1133         return ret;
1134 }
1135
1136 static void __exit exit_ceph(void)
1137 {
1138         dout("exit_ceph\n");
1139         unregister_filesystem(&ceph_fs_type);
1140         ceph_xattr_exit();
1141         destroy_caches();
1142 }
1143
1144 module_init(init_ceph);
1145 module_exit(exit_ceph);
1146
1147 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1148 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1149 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1150 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1151 MODULE_LICENSE("GPL");