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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 | #include "cache.h" | |
21 | ||
22 | #include <linux/ceph/ceph_features.h> | |
23 | #include <linux/ceph/decode.h> | |
24 | #include <linux/ceph/mon_client.h> | |
25 | #include <linux/ceph/auth.h> | |
26 | #include <linux/ceph/debugfs.h> | |
27 | ||
28 | /* | |
29 | * Ceph superblock operations | |
30 | * | |
31 | * Handle the basics of mounting, unmounting. | |
32 | */ | |
33 | ||
34 | /* | |
35 | * super ops | |
36 | */ | |
37 | static void ceph_put_super(struct super_block *s) | |
38 | { | |
39 | struct ceph_fs_client *fsc = ceph_sb_to_client(s); | |
40 | ||
41 | dout("put_super\n"); | |
42 | ceph_mdsc_close_sessions(fsc->mdsc); | |
43 | } | |
44 | ||
45 | static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) | |
46 | { | |
47 | struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry)); | |
48 | struct ceph_monmap *monmap = fsc->client->monc.monmap; | |
49 | struct ceph_statfs st; | |
50 | u64 fsid; | |
51 | int err; | |
52 | ||
53 | dout("statfs\n"); | |
54 | err = ceph_monc_do_statfs(&fsc->client->monc, &st); | |
55 | if (err < 0) | |
56 | return err; | |
57 | ||
58 | /* fill in kstatfs */ | |
59 | buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ | |
60 | ||
61 | /* | |
62 | * express utilization in terms of large blocks to avoid | |
63 | * overflow on 32-bit machines. | |
64 | * | |
65 | * NOTE: for the time being, we make bsize == frsize to humor | |
66 | * not-yet-ancient versions of glibc that are broken. | |
67 | * Someday, we will probably want to report a real block | |
68 | * size... whatever that may mean for a network file system! | |
69 | */ | |
70 | buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; | |
71 | buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; | |
72 | buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); | |
73 | buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); | |
74 | buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); | |
75 | ||
76 | buf->f_files = le64_to_cpu(st.num_objects); | |
77 | buf->f_ffree = -1; | |
78 | buf->f_namelen = NAME_MAX; | |
79 | ||
80 | /* leave fsid little-endian, regardless of host endianness */ | |
81 | fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); | |
82 | buf->f_fsid.val[0] = fsid & 0xffffffff; | |
83 | buf->f_fsid.val[1] = fsid >> 32; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | ||
89 | static int ceph_sync_fs(struct super_block *sb, int wait) | |
90 | { | |
91 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); | |
92 | ||
93 | if (!wait) { | |
94 | dout("sync_fs (non-blocking)\n"); | |
95 | ceph_flush_dirty_caps(fsc->mdsc); | |
96 | dout("sync_fs (non-blocking) done\n"); | |
97 | return 0; | |
98 | } | |
99 | ||
100 | dout("sync_fs (blocking)\n"); | |
101 | ceph_osdc_sync(&fsc->client->osdc); | |
102 | ceph_mdsc_sync(fsc->mdsc); | |
103 | dout("sync_fs (blocking) done\n"); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | /* | |
108 | * mount options | |
109 | */ | |
110 | enum { | |
111 | Opt_wsize, | |
112 | Opt_rsize, | |
113 | Opt_rasize, | |
114 | Opt_caps_wanted_delay_min, | |
115 | Opt_caps_wanted_delay_max, | |
116 | Opt_cap_release_safety, | |
117 | Opt_readdir_max_entries, | |
118 | Opt_readdir_max_bytes, | |
119 | Opt_congestion_kb, | |
120 | Opt_last_int, | |
121 | /* int args above */ | |
122 | Opt_snapdirname, | |
123 | Opt_mds_namespace, | |
124 | Opt_last_string, | |
125 | /* string args above */ | |
126 | Opt_dirstat, | |
127 | Opt_nodirstat, | |
128 | Opt_rbytes, | |
129 | Opt_norbytes, | |
130 | Opt_asyncreaddir, | |
131 | Opt_noasyncreaddir, | |
132 | Opt_dcache, | |
133 | Opt_nodcache, | |
134 | Opt_ino32, | |
135 | Opt_noino32, | |
136 | Opt_fscache, | |
137 | Opt_nofscache, | |
138 | Opt_poolperm, | |
139 | Opt_nopoolperm, | |
140 | #ifdef CONFIG_CEPH_FS_POSIX_ACL | |
141 | Opt_acl, | |
142 | #endif | |
143 | Opt_noacl, | |
144 | }; | |
145 | ||
146 | static match_table_t fsopt_tokens = { | |
147 | {Opt_wsize, "wsize=%d"}, | |
148 | {Opt_rsize, "rsize=%d"}, | |
149 | {Opt_rasize, "rasize=%d"}, | |
150 | {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, | |
151 | {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, | |
152 | {Opt_cap_release_safety, "cap_release_safety=%d"}, | |
153 | {Opt_readdir_max_entries, "readdir_max_entries=%d"}, | |
154 | {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, | |
155 | {Opt_congestion_kb, "write_congestion_kb=%d"}, | |
156 | /* int args above */ | |
157 | {Opt_snapdirname, "snapdirname=%s"}, | |
158 | {Opt_mds_namespace, "mds_namespace=%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 | {Opt_fscache, "fsc"}, | |
171 | {Opt_nofscache, "nofsc"}, | |
172 | {Opt_poolperm, "poolperm"}, | |
173 | {Opt_nopoolperm, "nopoolperm"}, | |
174 | #ifdef CONFIG_CEPH_FS_POSIX_ACL | |
175 | {Opt_acl, "acl"}, | |
176 | #endif | |
177 | {Opt_noacl, "noacl"}, | |
178 | {-1, NULL} | |
179 | }; | |
180 | ||
181 | static int parse_fsopt_token(char *c, void *private) | |
182 | { | |
183 | struct ceph_mount_options *fsopt = private; | |
184 | substring_t argstr[MAX_OPT_ARGS]; | |
185 | int token, intval, ret; | |
186 | ||
187 | token = match_token((char *)c, fsopt_tokens, argstr); | |
188 | if (token < 0) | |
189 | return -EINVAL; | |
190 | ||
191 | if (token < Opt_last_int) { | |
192 | ret = match_int(&argstr[0], &intval); | |
193 | if (ret < 0) { | |
194 | pr_err("bad mount option arg (not int) " | |
195 | "at '%s'\n", c); | |
196 | return ret; | |
197 | } | |
198 | dout("got int token %d val %d\n", token, intval); | |
199 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
200 | dout("got string token %d val %s\n", token, | |
201 | argstr[0].from); | |
202 | } else { | |
203 | dout("got token %d\n", token); | |
204 | } | |
205 | ||
206 | switch (token) { | |
207 | case Opt_snapdirname: | |
208 | kfree(fsopt->snapdir_name); | |
209 | fsopt->snapdir_name = kstrndup(argstr[0].from, | |
210 | argstr[0].to-argstr[0].from, | |
211 | GFP_KERNEL); | |
212 | if (!fsopt->snapdir_name) | |
213 | return -ENOMEM; | |
214 | break; | |
215 | case Opt_mds_namespace: | |
216 | fsopt->mds_namespace = kstrndup(argstr[0].from, | |
217 | argstr[0].to-argstr[0].from, | |
218 | GFP_KERNEL); | |
219 | if (!fsopt->mds_namespace) | |
220 | return -ENOMEM; | |
221 | break; | |
222 | /* misc */ | |
223 | case Opt_wsize: | |
224 | fsopt->wsize = intval; | |
225 | break; | |
226 | case Opt_rsize: | |
227 | fsopt->rsize = intval; | |
228 | break; | |
229 | case Opt_rasize: | |
230 | fsopt->rasize = intval; | |
231 | break; | |
232 | case Opt_caps_wanted_delay_min: | |
233 | fsopt->caps_wanted_delay_min = intval; | |
234 | break; | |
235 | case Opt_caps_wanted_delay_max: | |
236 | fsopt->caps_wanted_delay_max = intval; | |
237 | break; | |
238 | case Opt_readdir_max_entries: | |
239 | fsopt->max_readdir = intval; | |
240 | break; | |
241 | case Opt_readdir_max_bytes: | |
242 | fsopt->max_readdir_bytes = intval; | |
243 | break; | |
244 | case Opt_congestion_kb: | |
245 | fsopt->congestion_kb = intval; | |
246 | break; | |
247 | case Opt_dirstat: | |
248 | fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; | |
249 | break; | |
250 | case Opt_nodirstat: | |
251 | fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; | |
252 | break; | |
253 | case Opt_rbytes: | |
254 | fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; | |
255 | break; | |
256 | case Opt_norbytes: | |
257 | fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; | |
258 | break; | |
259 | case Opt_asyncreaddir: | |
260 | fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; | |
261 | break; | |
262 | case Opt_noasyncreaddir: | |
263 | fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; | |
264 | break; | |
265 | case Opt_dcache: | |
266 | fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; | |
267 | break; | |
268 | case Opt_nodcache: | |
269 | fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; | |
270 | break; | |
271 | case Opt_ino32: | |
272 | fsopt->flags |= CEPH_MOUNT_OPT_INO32; | |
273 | break; | |
274 | case Opt_noino32: | |
275 | fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; | |
276 | break; | |
277 | case Opt_fscache: | |
278 | fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; | |
279 | break; | |
280 | case Opt_nofscache: | |
281 | fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; | |
282 | break; | |
283 | case Opt_poolperm: | |
284 | fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; | |
285 | printk ("pool perm"); | |
286 | break; | |
287 | case Opt_nopoolperm: | |
288 | fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; | |
289 | break; | |
290 | #ifdef CONFIG_CEPH_FS_POSIX_ACL | |
291 | case Opt_acl: | |
292 | fsopt->sb_flags |= MS_POSIXACL; | |
293 | break; | |
294 | #endif | |
295 | case Opt_noacl: | |
296 | fsopt->sb_flags &= ~MS_POSIXACL; | |
297 | break; | |
298 | default: | |
299 | BUG_ON(token); | |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static void destroy_mount_options(struct ceph_mount_options *args) | |
305 | { | |
306 | dout("destroy_mount_options %p\n", args); | |
307 | kfree(args->snapdir_name); | |
308 | kfree(args->mds_namespace); | |
309 | kfree(args->server_path); | |
310 | kfree(args); | |
311 | } | |
312 | ||
313 | static int strcmp_null(const char *s1, const char *s2) | |
314 | { | |
315 | if (!s1 && !s2) | |
316 | return 0; | |
317 | if (s1 && !s2) | |
318 | return -1; | |
319 | if (!s1 && s2) | |
320 | return 1; | |
321 | return strcmp(s1, s2); | |
322 | } | |
323 | ||
324 | static int compare_mount_options(struct ceph_mount_options *new_fsopt, | |
325 | struct ceph_options *new_opt, | |
326 | struct ceph_fs_client *fsc) | |
327 | { | |
328 | struct ceph_mount_options *fsopt1 = new_fsopt; | |
329 | struct ceph_mount_options *fsopt2 = fsc->mount_options; | |
330 | int ofs = offsetof(struct ceph_mount_options, snapdir_name); | |
331 | int ret; | |
332 | ||
333 | ret = memcmp(fsopt1, fsopt2, ofs); | |
334 | if (ret) | |
335 | return ret; | |
336 | ||
337 | ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); | |
338 | if (ret) | |
339 | return ret; | |
340 | ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace); | |
341 | if (ret) | |
342 | return ret; | |
343 | ||
344 | ret = strcmp_null(fsopt1->server_path, fsopt2->server_path); | |
345 | if (ret) | |
346 | return ret; | |
347 | ||
348 | return ceph_compare_options(new_opt, fsc->client); | |
349 | } | |
350 | ||
351 | static int parse_mount_options(struct ceph_mount_options **pfsopt, | |
352 | struct ceph_options **popt, | |
353 | int flags, char *options, | |
354 | const char *dev_name) | |
355 | { | |
356 | struct ceph_mount_options *fsopt; | |
357 | const char *dev_name_end; | |
358 | int err; | |
359 | ||
360 | if (!dev_name || !*dev_name) | |
361 | return -EINVAL; | |
362 | ||
363 | fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); | |
364 | if (!fsopt) | |
365 | return -ENOMEM; | |
366 | ||
367 | dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); | |
368 | ||
369 | fsopt->sb_flags = flags; | |
370 | fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; | |
371 | ||
372 | fsopt->rsize = CEPH_RSIZE_DEFAULT; | |
373 | fsopt->rasize = CEPH_RASIZE_DEFAULT; | |
374 | fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); | |
375 | if (!fsopt->snapdir_name) { | |
376 | err = -ENOMEM; | |
377 | goto out; | |
378 | } | |
379 | ||
380 | fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; | |
381 | fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; | |
382 | fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; | |
383 | fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; | |
384 | fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; | |
385 | fsopt->congestion_kb = default_congestion_kb(); | |
386 | ||
387 | /* | |
388 | * Distinguish the server list from the path in "dev_name". | |
389 | * Internally we do not include the leading '/' in the path. | |
390 | * | |
391 | * "dev_name" will look like: | |
392 | * <server_spec>[,<server_spec>...]:[<path>] | |
393 | * where | |
394 | * <server_spec> is <ip>[:<port>] | |
395 | * <path> is optional, but if present must begin with '/' | |
396 | */ | |
397 | dev_name_end = strchr(dev_name, '/'); | |
398 | if (dev_name_end) { | |
399 | if (strlen(dev_name_end) > 1) { | |
400 | fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL); | |
401 | if (!fsopt->server_path) { | |
402 | err = -ENOMEM; | |
403 | goto out; | |
404 | } | |
405 | } | |
406 | } else { | |
407 | dev_name_end = dev_name + strlen(dev_name); | |
408 | } | |
409 | err = -EINVAL; | |
410 | dev_name_end--; /* back up to ':' separator */ | |
411 | if (dev_name_end < dev_name || *dev_name_end != ':') { | |
412 | pr_err("device name is missing path (no : separator in %s)\n", | |
413 | dev_name); | |
414 | goto out; | |
415 | } | |
416 | dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); | |
417 | if (fsopt->server_path) | |
418 | dout("server path '%s'\n", fsopt->server_path); | |
419 | ||
420 | *popt = ceph_parse_options(options, dev_name, dev_name_end, | |
421 | parse_fsopt_token, (void *)fsopt); | |
422 | if (IS_ERR(*popt)) { | |
423 | err = PTR_ERR(*popt); | |
424 | goto out; | |
425 | } | |
426 | ||
427 | /* success */ | |
428 | *pfsopt = fsopt; | |
429 | return 0; | |
430 | ||
431 | out: | |
432 | destroy_mount_options(fsopt); | |
433 | return err; | |
434 | } | |
435 | ||
436 | /** | |
437 | * ceph_show_options - Show mount options in /proc/mounts | |
438 | * @m: seq_file to write to | |
439 | * @root: root of that (sub)tree | |
440 | */ | |
441 | static int ceph_show_options(struct seq_file *m, struct dentry *root) | |
442 | { | |
443 | struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); | |
444 | struct ceph_mount_options *fsopt = fsc->mount_options; | |
445 | size_t pos; | |
446 | int ret; | |
447 | ||
448 | /* a comma between MNT/MS and client options */ | |
449 | seq_putc(m, ','); | |
450 | pos = m->count; | |
451 | ||
452 | ret = ceph_print_client_options(m, fsc->client); | |
453 | if (ret) | |
454 | return ret; | |
455 | ||
456 | /* retract our comma if no client options */ | |
457 | if (m->count == pos) | |
458 | m->count--; | |
459 | ||
460 | if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) | |
461 | seq_puts(m, ",dirstat"); | |
462 | if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES)) | |
463 | seq_puts(m, ",rbytes"); | |
464 | if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) | |
465 | seq_puts(m, ",noasyncreaddir"); | |
466 | if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) | |
467 | seq_puts(m, ",nodcache"); | |
468 | if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) | |
469 | seq_puts(m, ",fsc"); | |
470 | if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) | |
471 | seq_puts(m, ",nopoolperm"); | |
472 | ||
473 | #ifdef CONFIG_CEPH_FS_POSIX_ACL | |
474 | if (fsopt->sb_flags & MS_POSIXACL) | |
475 | seq_puts(m, ",acl"); | |
476 | else | |
477 | seq_puts(m, ",noacl"); | |
478 | #endif | |
479 | ||
480 | if (fsopt->mds_namespace) | |
481 | seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace); | |
482 | if (fsopt->wsize) | |
483 | seq_printf(m, ",wsize=%d", fsopt->wsize); | |
484 | if (fsopt->rsize != CEPH_RSIZE_DEFAULT) | |
485 | seq_printf(m, ",rsize=%d", fsopt->rsize); | |
486 | if (fsopt->rasize != CEPH_RASIZE_DEFAULT) | |
487 | seq_printf(m, ",rasize=%d", fsopt->rasize); | |
488 | if (fsopt->congestion_kb != default_congestion_kb()) | |
489 | seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); | |
490 | if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) | |
491 | seq_printf(m, ",caps_wanted_delay_min=%d", | |
492 | fsopt->caps_wanted_delay_min); | |
493 | if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) | |
494 | seq_printf(m, ",caps_wanted_delay_max=%d", | |
495 | fsopt->caps_wanted_delay_max); | |
496 | if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) | |
497 | seq_printf(m, ",cap_release_safety=%d", | |
498 | fsopt->cap_release_safety); | |
499 | if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) | |
500 | seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); | |
501 | if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) | |
502 | seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); | |
503 | if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) | |
504 | seq_show_option(m, "snapdirname", fsopt->snapdir_name); | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | /* | |
510 | * handle any mon messages the standard library doesn't understand. | |
511 | * return error if we don't either. | |
512 | */ | |
513 | static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) | |
514 | { | |
515 | struct ceph_fs_client *fsc = client->private; | |
516 | int type = le16_to_cpu(msg->hdr.type); | |
517 | ||
518 | switch (type) { | |
519 | case CEPH_MSG_MDS_MAP: | |
520 | ceph_mdsc_handle_mdsmap(fsc->mdsc, msg); | |
521 | return 0; | |
522 | case CEPH_MSG_FS_MAP_USER: | |
523 | ceph_mdsc_handle_fsmap(fsc->mdsc, msg); | |
524 | return 0; | |
525 | default: | |
526 | return -1; | |
527 | } | |
528 | } | |
529 | ||
530 | /* | |
531 | * create a new fs client | |
532 | */ | |
533 | static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, | |
534 | struct ceph_options *opt) | |
535 | { | |
536 | struct ceph_fs_client *fsc; | |
537 | const u64 supported_features = | |
538 | CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH | | |
539 | CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA; | |
540 | const u64 required_features = 0; | |
541 | int page_count; | |
542 | size_t size; | |
543 | int err = -ENOMEM; | |
544 | ||
545 | fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); | |
546 | if (!fsc) | |
547 | return ERR_PTR(-ENOMEM); | |
548 | ||
549 | fsc->client = ceph_create_client(opt, fsc, supported_features, | |
550 | required_features); | |
551 | if (IS_ERR(fsc->client)) { | |
552 | err = PTR_ERR(fsc->client); | |
553 | goto fail; | |
554 | } | |
555 | fsc->client->extra_mon_dispatch = extra_mon_dispatch; | |
556 | ||
557 | if (fsopt->mds_namespace == NULL) { | |
558 | ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, | |
559 | 0, true); | |
560 | } else { | |
561 | ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP, | |
562 | 0, false); | |
563 | } | |
564 | ||
565 | fsc->mount_options = fsopt; | |
566 | ||
567 | fsc->sb = NULL; | |
568 | fsc->mount_state = CEPH_MOUNT_MOUNTING; | |
569 | ||
570 | atomic_long_set(&fsc->writeback_count, 0); | |
571 | ||
572 | err = bdi_init(&fsc->backing_dev_info); | |
573 | if (err < 0) | |
574 | goto fail_client; | |
575 | ||
576 | err = -ENOMEM; | |
577 | /* | |
578 | * The number of concurrent works can be high but they don't need | |
579 | * to be processed in parallel, limit concurrency. | |
580 | */ | |
581 | fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); | |
582 | if (fsc->wb_wq == NULL) | |
583 | goto fail_bdi; | |
584 | fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); | |
585 | if (fsc->pg_inv_wq == NULL) | |
586 | goto fail_wb_wq; | |
587 | fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); | |
588 | if (fsc->trunc_wq == NULL) | |
589 | goto fail_pg_inv_wq; | |
590 | ||
591 | /* set up mempools */ | |
592 | err = -ENOMEM; | |
593 | page_count = fsc->mount_options->wsize >> PAGE_SHIFT; | |
594 | size = sizeof (struct page *) * (page_count ? page_count : 1); | |
595 | fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); | |
596 | if (!fsc->wb_pagevec_pool) | |
597 | goto fail_trunc_wq; | |
598 | ||
599 | /* setup fscache */ | |
600 | if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && | |
601 | (ceph_fscache_register_fs(fsc) != 0)) | |
602 | goto fail_fscache; | |
603 | ||
604 | /* caps */ | |
605 | fsc->min_caps = fsopt->max_readdir; | |
606 | ||
607 | return fsc; | |
608 | ||
609 | fail_fscache: | |
610 | ceph_fscache_unregister_fs(fsc); | |
611 | fail_trunc_wq: | |
612 | destroy_workqueue(fsc->trunc_wq); | |
613 | fail_pg_inv_wq: | |
614 | destroy_workqueue(fsc->pg_inv_wq); | |
615 | fail_wb_wq: | |
616 | destroy_workqueue(fsc->wb_wq); | |
617 | fail_bdi: | |
618 | bdi_destroy(&fsc->backing_dev_info); | |
619 | fail_client: | |
620 | ceph_destroy_client(fsc->client); | |
621 | fail: | |
622 | kfree(fsc); | |
623 | return ERR_PTR(err); | |
624 | } | |
625 | ||
626 | static void destroy_fs_client(struct ceph_fs_client *fsc) | |
627 | { | |
628 | dout("destroy_fs_client %p\n", fsc); | |
629 | ||
630 | ceph_fscache_unregister_fs(fsc); | |
631 | ||
632 | destroy_workqueue(fsc->wb_wq); | |
633 | destroy_workqueue(fsc->pg_inv_wq); | |
634 | destroy_workqueue(fsc->trunc_wq); | |
635 | ||
636 | bdi_destroy(&fsc->backing_dev_info); | |
637 | ||
638 | mempool_destroy(fsc->wb_pagevec_pool); | |
639 | ||
640 | destroy_mount_options(fsc->mount_options); | |
641 | ||
642 | ceph_fs_debugfs_cleanup(fsc); | |
643 | ||
644 | ceph_destroy_client(fsc->client); | |
645 | ||
646 | kfree(fsc); | |
647 | dout("destroy_fs_client %p done\n", fsc); | |
648 | } | |
649 | ||
650 | /* | |
651 | * caches | |
652 | */ | |
653 | struct kmem_cache *ceph_inode_cachep; | |
654 | struct kmem_cache *ceph_cap_cachep; | |
655 | struct kmem_cache *ceph_cap_flush_cachep; | |
656 | struct kmem_cache *ceph_dentry_cachep; | |
657 | struct kmem_cache *ceph_file_cachep; | |
658 | ||
659 | static void ceph_inode_init_once(void *foo) | |
660 | { | |
661 | struct ceph_inode_info *ci = foo; | |
662 | inode_init_once(&ci->vfs_inode); | |
663 | } | |
664 | ||
665 | static int __init init_caches(void) | |
666 | { | |
667 | int error = -ENOMEM; | |
668 | ||
669 | ceph_inode_cachep = kmem_cache_create("ceph_inode_info", | |
670 | sizeof(struct ceph_inode_info), | |
671 | __alignof__(struct ceph_inode_info), | |
672 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| | |
673 | SLAB_ACCOUNT, ceph_inode_init_once); | |
674 | if (ceph_inode_cachep == NULL) | |
675 | return -ENOMEM; | |
676 | ||
677 | ceph_cap_cachep = KMEM_CACHE(ceph_cap, | |
678 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); | |
679 | if (ceph_cap_cachep == NULL) | |
680 | goto bad_cap; | |
681 | ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, | |
682 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); | |
683 | if (ceph_cap_flush_cachep == NULL) | |
684 | goto bad_cap_flush; | |
685 | ||
686 | ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, | |
687 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); | |
688 | if (ceph_dentry_cachep == NULL) | |
689 | goto bad_dentry; | |
690 | ||
691 | ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); | |
692 | ||
693 | if (ceph_file_cachep == NULL) | |
694 | goto bad_file; | |
695 | ||
696 | if ((error = ceph_fscache_register())) | |
697 | goto bad_file; | |
698 | ||
699 | return 0; | |
700 | bad_file: | |
701 | kmem_cache_destroy(ceph_dentry_cachep); | |
702 | bad_dentry: | |
703 | kmem_cache_destroy(ceph_cap_flush_cachep); | |
704 | bad_cap_flush: | |
705 | kmem_cache_destroy(ceph_cap_cachep); | |
706 | bad_cap: | |
707 | kmem_cache_destroy(ceph_inode_cachep); | |
708 | return error; | |
709 | } | |
710 | ||
711 | static void destroy_caches(void) | |
712 | { | |
713 | /* | |
714 | * Make sure all delayed rcu free inodes are flushed before we | |
715 | * destroy cache. | |
716 | */ | |
717 | rcu_barrier(); | |
718 | ||
719 | kmem_cache_destroy(ceph_inode_cachep); | |
720 | kmem_cache_destroy(ceph_cap_cachep); | |
721 | kmem_cache_destroy(ceph_cap_flush_cachep); | |
722 | kmem_cache_destroy(ceph_dentry_cachep); | |
723 | kmem_cache_destroy(ceph_file_cachep); | |
724 | ||
725 | ceph_fscache_unregister(); | |
726 | } | |
727 | ||
728 | ||
729 | /* | |
730 | * ceph_umount_begin - initiate forced umount. Tear down down the | |
731 | * mount, skipping steps that may hang while waiting for server(s). | |
732 | */ | |
733 | static void ceph_umount_begin(struct super_block *sb) | |
734 | { | |
735 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); | |
736 | ||
737 | dout("ceph_umount_begin - starting forced umount\n"); | |
738 | if (!fsc) | |
739 | return; | |
740 | fsc->mount_state = CEPH_MOUNT_SHUTDOWN; | |
741 | ceph_mdsc_force_umount(fsc->mdsc); | |
742 | return; | |
743 | } | |
744 | ||
745 | static const struct super_operations ceph_super_ops = { | |
746 | .alloc_inode = ceph_alloc_inode, | |
747 | .destroy_inode = ceph_destroy_inode, | |
748 | .write_inode = ceph_write_inode, | |
749 | .drop_inode = ceph_drop_inode, | |
750 | .evict_inode = ceph_evict_inode, | |
751 | .sync_fs = ceph_sync_fs, | |
752 | .put_super = ceph_put_super, | |
753 | .show_options = ceph_show_options, | |
754 | .statfs = ceph_statfs, | |
755 | .umount_begin = ceph_umount_begin, | |
756 | }; | |
757 | ||
758 | /* | |
759 | * Bootstrap mount by opening the root directory. Note the mount | |
760 | * @started time from caller, and time out if this takes too long. | |
761 | */ | |
762 | static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, | |
763 | const char *path, | |
764 | unsigned long started) | |
765 | { | |
766 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
767 | struct ceph_mds_request *req = NULL; | |
768 | int err; | |
769 | struct dentry *root; | |
770 | ||
771 | /* open dir */ | |
772 | dout("open_root_inode opening '%s'\n", path); | |
773 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); | |
774 | if (IS_ERR(req)) | |
775 | return ERR_CAST(req); | |
776 | req->r_path1 = kstrdup(path, GFP_NOFS); | |
777 | if (!req->r_path1) { | |
778 | root = ERR_PTR(-ENOMEM); | |
779 | goto out; | |
780 | } | |
781 | ||
782 | req->r_ino1.ino = CEPH_INO_ROOT; | |
783 | req->r_ino1.snap = CEPH_NOSNAP; | |
784 | req->r_started = started; | |
785 | req->r_timeout = fsc->client->options->mount_timeout; | |
786 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
787 | req->r_num_caps = 2; | |
788 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
789 | if (err == 0) { | |
790 | struct inode *inode = req->r_target_inode; | |
791 | req->r_target_inode = NULL; | |
792 | dout("open_root_inode success\n"); | |
793 | root = d_make_root(inode); | |
794 | if (!root) { | |
795 | root = ERR_PTR(-ENOMEM); | |
796 | goto out; | |
797 | } | |
798 | ceph_init_dentry(root); | |
799 | dout("open_root_inode success, root dentry is %p\n", root); | |
800 | } else { | |
801 | root = ERR_PTR(err); | |
802 | } | |
803 | out: | |
804 | ceph_mdsc_put_request(req); | |
805 | return root; | |
806 | } | |
807 | ||
808 | ||
809 | ||
810 | ||
811 | /* | |
812 | * mount: join the ceph cluster, and open root directory. | |
813 | */ | |
814 | static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) | |
815 | { | |
816 | int err; | |
817 | unsigned long started = jiffies; /* note the start time */ | |
818 | struct dentry *root; | |
819 | int first = 0; /* first vfsmount for this super_block */ | |
820 | ||
821 | dout("mount start %p\n", fsc); | |
822 | mutex_lock(&fsc->client->mount_mutex); | |
823 | ||
824 | if (!fsc->sb->s_root) { | |
825 | const char *path; | |
826 | err = __ceph_open_session(fsc->client, started); | |
827 | if (err < 0) | |
828 | goto out; | |
829 | ||
830 | if (!fsc->mount_options->server_path) { | |
831 | path = ""; | |
832 | dout("mount opening path \\t\n"); | |
833 | } else { | |
834 | path = fsc->mount_options->server_path + 1; | |
835 | dout("mount opening path %s\n", path); | |
836 | } | |
837 | root = open_root_dentry(fsc, path, started); | |
838 | if (IS_ERR(root)) { | |
839 | err = PTR_ERR(root); | |
840 | goto out; | |
841 | } | |
842 | fsc->sb->s_root = dget(root); | |
843 | first = 1; | |
844 | ||
845 | err = ceph_fs_debugfs_init(fsc); | |
846 | if (err < 0) | |
847 | goto fail; | |
848 | } | |
849 | ||
850 | fsc->mount_state = CEPH_MOUNT_MOUNTED; | |
851 | dout("mount success\n"); | |
852 | mutex_unlock(&fsc->client->mount_mutex); | |
853 | return root; | |
854 | ||
855 | fail: | |
856 | if (first) { | |
857 | dput(fsc->sb->s_root); | |
858 | fsc->sb->s_root = NULL; | |
859 | } | |
860 | out: | |
861 | mutex_unlock(&fsc->client->mount_mutex); | |
862 | return ERR_PTR(err); | |
863 | } | |
864 | ||
865 | static int ceph_set_super(struct super_block *s, void *data) | |
866 | { | |
867 | struct ceph_fs_client *fsc = data; | |
868 | int ret; | |
869 | ||
870 | dout("set_super %p data %p\n", s, data); | |
871 | ||
872 | s->s_flags = fsc->mount_options->sb_flags; | |
873 | s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ | |
874 | ||
875 | s->s_xattr = ceph_xattr_handlers; | |
876 | s->s_fs_info = fsc; | |
877 | fsc->sb = s; | |
878 | ||
879 | s->s_op = &ceph_super_ops; | |
880 | s->s_export_op = &ceph_export_ops; | |
881 | ||
882 | s->s_time_gran = 1000; /* 1000 ns == 1 us */ | |
883 | ||
884 | ret = set_anon_super(s, NULL); /* what is that second arg for? */ | |
885 | if (ret != 0) | |
886 | goto fail; | |
887 | ||
888 | return ret; | |
889 | ||
890 | fail: | |
891 | s->s_fs_info = NULL; | |
892 | fsc->sb = NULL; | |
893 | return ret; | |
894 | } | |
895 | ||
896 | /* | |
897 | * share superblock if same fs AND options | |
898 | */ | |
899 | static int ceph_compare_super(struct super_block *sb, void *data) | |
900 | { | |
901 | struct ceph_fs_client *new = data; | |
902 | struct ceph_mount_options *fsopt = new->mount_options; | |
903 | struct ceph_options *opt = new->client->options; | |
904 | struct ceph_fs_client *other = ceph_sb_to_client(sb); | |
905 | ||
906 | dout("ceph_compare_super %p\n", sb); | |
907 | ||
908 | if (compare_mount_options(fsopt, opt, other)) { | |
909 | dout("monitor(s)/mount options don't match\n"); | |
910 | return 0; | |
911 | } | |
912 | if ((opt->flags & CEPH_OPT_FSID) && | |
913 | ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { | |
914 | dout("fsid doesn't match\n"); | |
915 | return 0; | |
916 | } | |
917 | if (fsopt->sb_flags != other->mount_options->sb_flags) { | |
918 | dout("flags differ\n"); | |
919 | return 0; | |
920 | } | |
921 | return 1; | |
922 | } | |
923 | ||
924 | /* | |
925 | * construct our own bdi so we can control readahead, etc. | |
926 | */ | |
927 | static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); | |
928 | ||
929 | static int ceph_register_bdi(struct super_block *sb, | |
930 | struct ceph_fs_client *fsc) | |
931 | { | |
932 | int err; | |
933 | ||
934 | /* set ra_pages based on rasize mount option? */ | |
935 | if (fsc->mount_options->rasize >= PAGE_SIZE) | |
936 | fsc->backing_dev_info.ra_pages = | |
937 | (fsc->mount_options->rasize + PAGE_SIZE - 1) | |
938 | >> PAGE_SHIFT; | |
939 | else | |
940 | fsc->backing_dev_info.ra_pages = | |
941 | VM_MAX_READAHEAD * 1024 / PAGE_SIZE; | |
942 | ||
943 | err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", | |
944 | atomic_long_inc_return(&bdi_seq)); | |
945 | if (!err) | |
946 | sb->s_bdi = &fsc->backing_dev_info; | |
947 | return err; | |
948 | } | |
949 | ||
950 | static struct dentry *ceph_mount(struct file_system_type *fs_type, | |
951 | int flags, const char *dev_name, void *data) | |
952 | { | |
953 | struct super_block *sb; | |
954 | struct ceph_fs_client *fsc; | |
955 | struct dentry *res; | |
956 | int err; | |
957 | int (*compare_super)(struct super_block *, void *) = ceph_compare_super; | |
958 | struct ceph_mount_options *fsopt = NULL; | |
959 | struct ceph_options *opt = NULL; | |
960 | ||
961 | dout("ceph_mount\n"); | |
962 | ||
963 | #ifdef CONFIG_CEPH_FS_POSIX_ACL | |
964 | flags |= MS_POSIXACL; | |
965 | #endif | |
966 | err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); | |
967 | if (err < 0) { | |
968 | res = ERR_PTR(err); | |
969 | goto out_final; | |
970 | } | |
971 | ||
972 | /* create client (which we may/may not use) */ | |
973 | fsc = create_fs_client(fsopt, opt); | |
974 | if (IS_ERR(fsc)) { | |
975 | res = ERR_CAST(fsc); | |
976 | destroy_mount_options(fsopt); | |
977 | ceph_destroy_options(opt); | |
978 | goto out_final; | |
979 | } | |
980 | ||
981 | err = ceph_mdsc_init(fsc); | |
982 | if (err < 0) { | |
983 | res = ERR_PTR(err); | |
984 | goto out; | |
985 | } | |
986 | ||
987 | if (ceph_test_opt(fsc->client, NOSHARE)) | |
988 | compare_super = NULL; | |
989 | sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); | |
990 | if (IS_ERR(sb)) { | |
991 | res = ERR_CAST(sb); | |
992 | goto out; | |
993 | } | |
994 | ||
995 | if (ceph_sb_to_client(sb) != fsc) { | |
996 | ceph_mdsc_destroy(fsc); | |
997 | destroy_fs_client(fsc); | |
998 | fsc = ceph_sb_to_client(sb); | |
999 | dout("get_sb got existing client %p\n", fsc); | |
1000 | } else { | |
1001 | dout("get_sb using new client %p\n", fsc); | |
1002 | err = ceph_register_bdi(sb, fsc); | |
1003 | if (err < 0) { | |
1004 | res = ERR_PTR(err); | |
1005 | goto out_splat; | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | res = ceph_real_mount(fsc); | |
1010 | if (IS_ERR(res)) | |
1011 | goto out_splat; | |
1012 | dout("root %p inode %p ino %llx.%llx\n", res, | |
1013 | d_inode(res), ceph_vinop(d_inode(res))); | |
1014 | return res; | |
1015 | ||
1016 | out_splat: | |
1017 | ceph_mdsc_close_sessions(fsc->mdsc); | |
1018 | deactivate_locked_super(sb); | |
1019 | goto out_final; | |
1020 | ||
1021 | out: | |
1022 | ceph_mdsc_destroy(fsc); | |
1023 | destroy_fs_client(fsc); | |
1024 | out_final: | |
1025 | dout("ceph_mount fail %ld\n", PTR_ERR(res)); | |
1026 | return res; | |
1027 | } | |
1028 | ||
1029 | static void ceph_kill_sb(struct super_block *s) | |
1030 | { | |
1031 | struct ceph_fs_client *fsc = ceph_sb_to_client(s); | |
1032 | dev_t dev = s->s_dev; | |
1033 | ||
1034 | dout("kill_sb %p\n", s); | |
1035 | ||
1036 | ceph_mdsc_pre_umount(fsc->mdsc); | |
1037 | generic_shutdown_super(s); | |
1038 | ceph_mdsc_destroy(fsc); | |
1039 | ||
1040 | destroy_fs_client(fsc); | |
1041 | free_anon_bdev(dev); | |
1042 | } | |
1043 | ||
1044 | static struct file_system_type ceph_fs_type = { | |
1045 | .owner = THIS_MODULE, | |
1046 | .name = "ceph", | |
1047 | .mount = ceph_mount, | |
1048 | .kill_sb = ceph_kill_sb, | |
1049 | .fs_flags = FS_RENAME_DOES_D_MOVE, | |
1050 | }; | |
1051 | MODULE_ALIAS_FS("ceph"); | |
1052 | ||
1053 | static int __init init_ceph(void) | |
1054 | { | |
1055 | int ret = init_caches(); | |
1056 | if (ret) | |
1057 | goto out; | |
1058 | ||
1059 | ceph_flock_init(); | |
1060 | ceph_xattr_init(); | |
1061 | ret = register_filesystem(&ceph_fs_type); | |
1062 | if (ret) | |
1063 | goto out_xattr; | |
1064 | ||
1065 | pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); | |
1066 | ||
1067 | return 0; | |
1068 | ||
1069 | out_xattr: | |
1070 | ceph_xattr_exit(); | |
1071 | destroy_caches(); | |
1072 | out: | |
1073 | return ret; | |
1074 | } | |
1075 | ||
1076 | static void __exit exit_ceph(void) | |
1077 | { | |
1078 | dout("exit_ceph\n"); | |
1079 | unregister_filesystem(&ceph_fs_type); | |
1080 | ceph_xattr_exit(); | |
1081 | destroy_caches(); | |
1082 | } | |
1083 | ||
1084 | module_init(init_ceph); | |
1085 | module_exit(exit_ceph); | |
1086 | ||
1087 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
1088 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
1089 | MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); | |
1090 | MODULE_DESCRIPTION("Ceph filesystem for Linux"); | |
1091 | MODULE_LICENSE("GPL"); |