Commit | Line | Data |
---|---|---|
16725b9d | 1 | |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
16725b9d SW |
3 | |
4 | #include <linux/backing-dev.h> | |
c309f0ab | 5 | #include <linux/ctype.h> |
16725b9d SW |
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> | |
16725b9d SW |
12 | #include <linux/sched.h> |
13 | #include <linux/seq_file.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
16725b9d SW |
15 | #include <linux/statfs.h> |
16 | #include <linux/string.h> | |
16725b9d | 17 | |
16725b9d | 18 | #include "super.h" |
3d14c5d2 YS |
19 | #include "mds_client.h" |
20 | ||
21 | #include <linux/ceph/decode.h> | |
22 | #include <linux/ceph/mon_client.h> | |
23 | #include <linux/ceph/auth.h> | |
24 | #include <linux/ceph/debugfs.h> | |
16725b9d SW |
25 | |
26 | /* | |
27 | * Ceph superblock operations | |
28 | * | |
29 | * Handle the basics of mounting, unmounting. | |
30 | */ | |
31 | ||
16725b9d SW |
32 | /* |
33 | * super ops | |
34 | */ | |
35 | static void ceph_put_super(struct super_block *s) | |
36 | { | |
3d14c5d2 | 37 | struct ceph_fs_client *fsc = ceph_sb_to_client(s); |
16725b9d SW |
38 | |
39 | dout("put_super\n"); | |
3d14c5d2 | 40 | ceph_mdsc_close_sessions(fsc->mdsc); |
5dfc589a SW |
41 | |
42 | /* | |
43 | * ensure we release the bdi before put_anon_super releases | |
44 | * the device name. | |
45 | */ | |
3d14c5d2 YS |
46 | if (s->s_bdi == &fsc->backing_dev_info) { |
47 | bdi_unregister(&fsc->backing_dev_info); | |
5dfc589a SW |
48 | s->s_bdi = NULL; |
49 | } | |
50 | ||
16725b9d SW |
51 | return; |
52 | } | |
53 | ||
54 | static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) | |
55 | { | |
3d14c5d2 YS |
56 | struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode); |
57 | struct ceph_monmap *monmap = fsc->client->monc.monmap; | |
16725b9d SW |
58 | struct ceph_statfs st; |
59 | u64 fsid; | |
60 | int err; | |
61 | ||
62 | dout("statfs\n"); | |
3d14c5d2 | 63 | err = ceph_monc_do_statfs(&fsc->client->monc, &st); |
16725b9d SW |
64 | if (err < 0) |
65 | return err; | |
66 | ||
67 | /* fill in kstatfs */ | |
68 | buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ | |
69 | ||
70 | /* | |
71 | * express utilization in terms of large blocks to avoid | |
72 | * overflow on 32-bit machines. | |
73 | */ | |
74 | buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; | |
75 | buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); | |
8f04d422 | 76 | buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); |
16725b9d SW |
77 | buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); |
78 | ||
79 | buf->f_files = le64_to_cpu(st.num_objects); | |
80 | buf->f_ffree = -1; | |
558d3499 | 81 | buf->f_namelen = NAME_MAX; |
16725b9d SW |
82 | buf->f_frsize = PAGE_CACHE_SIZE; |
83 | ||
84 | /* leave fsid little-endian, regardless of host endianness */ | |
85 | fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); | |
86 | buf->f_fsid.val[0] = fsid & 0xffffffff; | |
87 | buf->f_fsid.val[1] = fsid >> 32; | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | ||
2d9c98ae | 93 | static int ceph_sync_fs(struct super_block *sb, int wait) |
16725b9d | 94 | { |
3d14c5d2 | 95 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); |
2d9c98ae SW |
96 | |
97 | if (!wait) { | |
98 | dout("sync_fs (non-blocking)\n"); | |
3d14c5d2 | 99 | ceph_flush_dirty_caps(fsc->mdsc); |
2d9c98ae SW |
100 | dout("sync_fs (non-blocking) done\n"); |
101 | return 0; | |
102 | } | |
103 | ||
104 | dout("sync_fs (blocking)\n"); | |
3d14c5d2 YS |
105 | ceph_osdc_sync(&fsc->client->osdc); |
106 | ceph_mdsc_sync(fsc->mdsc); | |
2d9c98ae | 107 | dout("sync_fs (blocking) done\n"); |
16725b9d SW |
108 | return 0; |
109 | } | |
110 | ||
16725b9d SW |
111 | /* |
112 | * mount options | |
113 | */ | |
114 | enum { | |
16725b9d SW |
115 | Opt_wsize, |
116 | Opt_rsize, | |
83817e35 | 117 | Opt_rasize, |
16725b9d SW |
118 | Opt_caps_wanted_delay_min, |
119 | Opt_caps_wanted_delay_max, | |
6e19a16e | 120 | Opt_cap_release_safety, |
16725b9d | 121 | Opt_readdir_max_entries, |
23804d91 | 122 | Opt_readdir_max_bytes, |
2baba250 | 123 | Opt_congestion_kb, |
e53c2fe0 | 124 | Opt_last_int, |
16725b9d SW |
125 | /* int args above */ |
126 | Opt_snapdirname, | |
e53c2fe0 | 127 | Opt_last_string, |
16725b9d | 128 | /* string args above */ |
16725b9d SW |
129 | Opt_dirstat, |
130 | Opt_nodirstat, | |
131 | Opt_rbytes, | |
132 | Opt_norbytes, | |
16725b9d | 133 | Opt_noasyncreaddir, |
a40dc6cc SW |
134 | Opt_dcache, |
135 | Opt_nodcache, | |
ad1fee96 | 136 | Opt_ino32, |
16725b9d SW |
137 | }; |
138 | ||
3d14c5d2 | 139 | static match_table_t fsopt_tokens = { |
16725b9d SW |
140 | {Opt_wsize, "wsize=%d"}, |
141 | {Opt_rsize, "rsize=%d"}, | |
83817e35 | 142 | {Opt_rasize, "rasize=%d"}, |
16725b9d SW |
143 | {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, |
144 | {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, | |
6e19a16e | 145 | {Opt_cap_release_safety, "cap_release_safety=%d"}, |
16725b9d | 146 | {Opt_readdir_max_entries, "readdir_max_entries=%d"}, |
23804d91 | 147 | {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, |
2baba250 | 148 | {Opt_congestion_kb, "write_congestion_kb=%d"}, |
16725b9d SW |
149 | /* int args above */ |
150 | {Opt_snapdirname, "snapdirname=%s"}, | |
16725b9d | 151 | /* string args above */ |
16725b9d SW |
152 | {Opt_dirstat, "dirstat"}, |
153 | {Opt_nodirstat, "nodirstat"}, | |
154 | {Opt_rbytes, "rbytes"}, | |
155 | {Opt_norbytes, "norbytes"}, | |
16725b9d | 156 | {Opt_noasyncreaddir, "noasyncreaddir"}, |
a40dc6cc SW |
157 | {Opt_dcache, "dcache"}, |
158 | {Opt_nodcache, "nodcache"}, | |
ad1fee96 | 159 | {Opt_ino32, "ino32"}, |
16725b9d SW |
160 | {-1, NULL} |
161 | }; | |
162 | ||
3d14c5d2 | 163 | static int parse_fsopt_token(char *c, void *private) |
c309f0ab | 164 | { |
3d14c5d2 YS |
165 | struct ceph_mount_options *fsopt = private; |
166 | substring_t argstr[MAX_OPT_ARGS]; | |
167 | int token, intval, ret; | |
168 | ||
169 | token = match_token((char *)c, fsopt_tokens, argstr); | |
170 | if (token < 0) | |
171 | return -EINVAL; | |
172 | ||
173 | if (token < Opt_last_int) { | |
174 | ret = match_int(&argstr[0], &intval); | |
175 | if (ret < 0) { | |
176 | pr_err("bad mount option arg (not int) " | |
177 | "at '%s'\n", c); | |
178 | return ret; | |
c309f0ab | 179 | } |
3d14c5d2 YS |
180 | dout("got int token %d val %d\n", token, intval); |
181 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
182 | dout("got string token %d val %s\n", token, | |
183 | argstr[0].from); | |
184 | } else { | |
185 | dout("got token %d\n", token); | |
c309f0ab SW |
186 | } |
187 | ||
3d14c5d2 YS |
188 | switch (token) { |
189 | case Opt_snapdirname: | |
190 | kfree(fsopt->snapdir_name); | |
191 | fsopt->snapdir_name = kstrndup(argstr[0].from, | |
192 | argstr[0].to-argstr[0].from, | |
193 | GFP_KERNEL); | |
194 | if (!fsopt->snapdir_name) | |
195 | return -ENOMEM; | |
196 | break; | |
197 | ||
198 | /* misc */ | |
199 | case Opt_wsize: | |
200 | fsopt->wsize = intval; | |
201 | break; | |
202 | case Opt_rsize: | |
203 | fsopt->rsize = intval; | |
204 | break; | |
83817e35 SW |
205 | case Opt_rasize: |
206 | fsopt->rasize = intval; | |
207 | break; | |
3d14c5d2 YS |
208 | case Opt_caps_wanted_delay_min: |
209 | fsopt->caps_wanted_delay_min = intval; | |
210 | break; | |
211 | case Opt_caps_wanted_delay_max: | |
212 | fsopt->caps_wanted_delay_max = intval; | |
213 | break; | |
214 | case Opt_readdir_max_entries: | |
215 | fsopt->max_readdir = intval; | |
216 | break; | |
217 | case Opt_readdir_max_bytes: | |
218 | fsopt->max_readdir_bytes = intval; | |
219 | break; | |
220 | case Opt_congestion_kb: | |
221 | fsopt->congestion_kb = intval; | |
222 | break; | |
223 | case Opt_dirstat: | |
224 | fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; | |
225 | break; | |
226 | case Opt_nodirstat: | |
227 | fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; | |
228 | break; | |
229 | case Opt_rbytes: | |
230 | fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; | |
231 | break; | |
232 | case Opt_norbytes: | |
233 | fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; | |
234 | break; | |
235 | case Opt_noasyncreaddir: | |
236 | fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; | |
237 | break; | |
a40dc6cc SW |
238 | case Opt_dcache: |
239 | fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; | |
240 | break; | |
241 | case Opt_nodcache: | |
242 | fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; | |
243 | break; | |
ad1fee96 YS |
244 | case Opt_ino32: |
245 | fsopt->flags |= CEPH_MOUNT_OPT_INO32; | |
246 | break; | |
3d14c5d2 YS |
247 | default: |
248 | BUG_ON(token); | |
249 | } | |
250 | return 0; | |
c309f0ab | 251 | } |
16725b9d | 252 | |
3d14c5d2 | 253 | static void destroy_mount_options(struct ceph_mount_options *args) |
16725b9d | 254 | { |
3d14c5d2 YS |
255 | dout("destroy_mount_options %p\n", args); |
256 | kfree(args->snapdir_name); | |
257 | kfree(args); | |
258 | } | |
16725b9d | 259 | |
3d14c5d2 YS |
260 | static int strcmp_null(const char *s1, const char *s2) |
261 | { | |
262 | if (!s1 && !s2) | |
263 | return 0; | |
264 | if (s1 && !s2) | |
265 | return -1; | |
266 | if (!s1 && s2) | |
267 | return 1; | |
268 | return strcmp(s1, s2); | |
269 | } | |
16725b9d | 270 | |
3d14c5d2 YS |
271 | static int compare_mount_options(struct ceph_mount_options *new_fsopt, |
272 | struct ceph_options *new_opt, | |
273 | struct ceph_fs_client *fsc) | |
274 | { | |
275 | struct ceph_mount_options *fsopt1 = new_fsopt; | |
276 | struct ceph_mount_options *fsopt2 = fsc->mount_options; | |
277 | int ofs = offsetof(struct ceph_mount_options, snapdir_name); | |
278 | int ret; | |
16725b9d | 279 | |
3d14c5d2 YS |
280 | ret = memcmp(fsopt1, fsopt2, ofs); |
281 | if (ret) | |
282 | return ret; | |
283 | ||
284 | ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); | |
285 | if (ret) | |
286 | return ret; | |
287 | ||
288 | return ceph_compare_options(new_opt, fsc->client); | |
289 | } | |
290 | ||
291 | static int parse_mount_options(struct ceph_mount_options **pfsopt, | |
292 | struct ceph_options **popt, | |
293 | int flags, char *options, | |
294 | const char *dev_name, | |
295 | const char **path) | |
296 | { | |
297 | struct ceph_mount_options *fsopt; | |
298 | const char *dev_name_end; | |
299 | int err = -ENOMEM; | |
300 | ||
301 | fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); | |
302 | if (!fsopt) | |
303 | return -ENOMEM; | |
304 | ||
305 | dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); | |
306 | ||
80db8bea NW |
307 | fsopt->sb_flags = flags; |
308 | fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; | |
3d14c5d2 | 309 | |
80db8bea NW |
310 | fsopt->rsize = CEPH_RSIZE_DEFAULT; |
311 | fsopt->rasize = CEPH_RASIZE_DEFAULT; | |
312 | fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); | |
50aac4fe SW |
313 | fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; |
314 | fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; | |
80db8bea NW |
315 | fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; |
316 | fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; | |
317 | fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; | |
318 | fsopt->congestion_kb = default_congestion_kb(); | |
319 | ||
320 | /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */ | |
321 | err = -EINVAL; | |
322 | if (!dev_name) | |
323 | goto out; | |
324 | *path = strstr(dev_name, ":/"); | |
325 | if (*path == NULL) { | |
326 | pr_err("device name is missing path (no :/ in %s)\n", | |
327 | dev_name); | |
328 | goto out; | |
329 | } | |
3d14c5d2 YS |
330 | dev_name_end = *path; |
331 | dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); | |
16725b9d | 332 | |
16725b9d SW |
333 | /* path on server */ |
334 | *path += 2; | |
335 | dout("server path '%s'\n", *path); | |
336 | ||
3d14c5d2 YS |
337 | err = ceph_parse_options(popt, options, dev_name, dev_name_end, |
338 | parse_fsopt_token, (void *)fsopt); | |
339 | if (err) | |
340 | goto out; | |
341 | ||
342 | /* success */ | |
343 | *pfsopt = fsopt; | |
344 | return 0; | |
16725b9d | 345 | |
7b813c46 | 346 | out: |
3d14c5d2 YS |
347 | destroy_mount_options(fsopt); |
348 | return err; | |
16725b9d SW |
349 | } |
350 | ||
3d14c5d2 YS |
351 | /** |
352 | * ceph_show_options - Show mount options in /proc/mounts | |
353 | * @m: seq_file to write to | |
34c80b1d | 354 | * @root: root of that (sub)tree |
3d14c5d2 | 355 | */ |
34c80b1d | 356 | static int ceph_show_options(struct seq_file *m, struct dentry *root) |
16725b9d | 357 | { |
34c80b1d | 358 | struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); |
3d14c5d2 YS |
359 | struct ceph_mount_options *fsopt = fsc->mount_options; |
360 | struct ceph_options *opt = fsc->client->options; | |
361 | ||
362 | if (opt->flags & CEPH_OPT_FSID) | |
363 | seq_printf(m, ",fsid=%pU", &opt->fsid); | |
364 | if (opt->flags & CEPH_OPT_NOSHARE) | |
365 | seq_puts(m, ",noshare"); | |
366 | if (opt->flags & CEPH_OPT_NOCRC) | |
367 | seq_puts(m, ",nocrc"); | |
368 | ||
369 | if (opt->name) | |
370 | seq_printf(m, ",name=%s", opt->name); | |
8323c3aa | 371 | if (opt->key) |
3d14c5d2 YS |
372 | seq_puts(m, ",secret=<hidden>"); |
373 | ||
374 | if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) | |
375 | seq_printf(m, ",mount_timeout=%d", opt->mount_timeout); | |
376 | if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) | |
377 | seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl); | |
378 | if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT) | |
379 | seq_printf(m, ",osdtimeout=%d", opt->osd_timeout); | |
380 | if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) | |
381 | seq_printf(m, ",osdkeepalivetimeout=%d", | |
382 | opt->osd_keepalive_timeout); | |
383 | ||
384 | if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) | |
385 | seq_puts(m, ",dirstat"); | |
386 | if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) | |
387 | seq_puts(m, ",norbytes"); | |
388 | if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) | |
389 | seq_puts(m, ",noasyncreaddir"); | |
a40dc6cc SW |
390 | if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE) |
391 | seq_puts(m, ",dcache"); | |
392 | else | |
393 | seq_puts(m, ",nodcache"); | |
3d14c5d2 YS |
394 | |
395 | if (fsopt->wsize) | |
396 | seq_printf(m, ",wsize=%d", fsopt->wsize); | |
80456f86 | 397 | if (fsopt->rsize != CEPH_RSIZE_DEFAULT) |
3d14c5d2 | 398 | seq_printf(m, ",rsize=%d", fsopt->rsize); |
83817e35 | 399 | if (fsopt->rasize != CEPH_RASIZE_DEFAULT) |
2151937d | 400 | seq_printf(m, ",rasize=%d", fsopt->rasize); |
3d14c5d2 YS |
401 | if (fsopt->congestion_kb != default_congestion_kb()) |
402 | seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); | |
403 | if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) | |
404 | seq_printf(m, ",caps_wanted_delay_min=%d", | |
405 | fsopt->caps_wanted_delay_min); | |
406 | if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) | |
407 | seq_printf(m, ",caps_wanted_delay_max=%d", | |
408 | fsopt->caps_wanted_delay_max); | |
409 | if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) | |
410 | seq_printf(m, ",cap_release_safety=%d", | |
411 | fsopt->cap_release_safety); | |
412 | if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) | |
413 | seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); | |
414 | if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) | |
415 | seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); | |
416 | if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) | |
417 | seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); | |
418 | return 0; | |
16725b9d SW |
419 | } |
420 | ||
421 | /* | |
3d14c5d2 YS |
422 | * handle any mon messages the standard library doesn't understand. |
423 | * return error if we don't either. | |
16725b9d | 424 | */ |
3d14c5d2 | 425 | static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) |
16725b9d | 426 | { |
3d14c5d2 YS |
427 | struct ceph_fs_client *fsc = client->private; |
428 | int type = le16_to_cpu(msg->hdr.type); | |
429 | ||
430 | switch (type) { | |
431 | case CEPH_MSG_MDS_MAP: | |
432 | ceph_mdsc_handle_map(fsc->mdsc, msg); | |
433 | return 0; | |
434 | ||
435 | default: | |
436 | return -1; | |
437 | } | |
438 | } | |
439 | ||
440 | /* | |
441 | * create a new fs client | |
442 | */ | |
0c6d4b4e | 443 | static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, |
3d14c5d2 YS |
444 | struct ceph_options *opt) |
445 | { | |
446 | struct ceph_fs_client *fsc; | |
6ab00d46 SW |
447 | const unsigned supported_features = |
448 | CEPH_FEATURE_FLOCK | | |
449 | CEPH_FEATURE_DIRLAYOUTHASH; | |
450 | const unsigned required_features = 0; | |
16725b9d SW |
451 | int err = -ENOMEM; |
452 | ||
3d14c5d2 YS |
453 | fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); |
454 | if (!fsc) | |
16725b9d SW |
455 | return ERR_PTR(-ENOMEM); |
456 | ||
6ab00d46 SW |
457 | fsc->client = ceph_create_client(opt, fsc, supported_features, |
458 | required_features); | |
3d14c5d2 YS |
459 | if (IS_ERR(fsc->client)) { |
460 | err = PTR_ERR(fsc->client); | |
461 | goto fail; | |
462 | } | |
463 | fsc->client->extra_mon_dispatch = extra_mon_dispatch; | |
3d14c5d2 | 464 | fsc->client->monc.want_mdsmap = 1; |
16725b9d | 465 | |
3d14c5d2 | 466 | fsc->mount_options = fsopt; |
16725b9d | 467 | |
3d14c5d2 YS |
468 | fsc->sb = NULL; |
469 | fsc->mount_state = CEPH_MOUNT_MOUNTING; | |
16725b9d | 470 | |
3d14c5d2 | 471 | atomic_long_set(&fsc->writeback_count, 0); |
16725b9d | 472 | |
3d14c5d2 | 473 | err = bdi_init(&fsc->backing_dev_info); |
859e7b14 | 474 | if (err < 0) |
3d14c5d2 | 475 | goto fail_client; |
859e7b14 | 476 | |
16725b9d | 477 | err = -ENOMEM; |
01e6acc4 TH |
478 | /* |
479 | * The number of concurrent works can be high but they don't need | |
480 | * to be processed in parallel, limit concurrency. | |
481 | */ | |
482 | fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); | |
3d14c5d2 | 483 | if (fsc->wb_wq == NULL) |
859e7b14 | 484 | goto fail_bdi; |
01e6acc4 | 485 | fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); |
3d14c5d2 | 486 | if (fsc->pg_inv_wq == NULL) |
16725b9d | 487 | goto fail_wb_wq; |
01e6acc4 | 488 | fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); |
3d14c5d2 | 489 | if (fsc->trunc_wq == NULL) |
16725b9d SW |
490 | goto fail_pg_inv_wq; |
491 | ||
b9bfb93c SW |
492 | /* set up mempools */ |
493 | err = -ENOMEM; | |
3d14c5d2 YS |
494 | fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, |
495 | fsc->mount_options->wsize >> PAGE_CACHE_SHIFT); | |
496 | if (!fsc->wb_pagevec_pool) | |
b9bfb93c SW |
497 | goto fail_trunc_wq; |
498 | ||
85ccce43 | 499 | /* caps */ |
3d14c5d2 YS |
500 | fsc->min_caps = fsopt->max_readdir; |
501 | ||
502 | return fsc; | |
b9bfb93c | 503 | |
16725b9d | 504 | fail_trunc_wq: |
3d14c5d2 | 505 | destroy_workqueue(fsc->trunc_wq); |
16725b9d | 506 | fail_pg_inv_wq: |
3d14c5d2 | 507 | destroy_workqueue(fsc->pg_inv_wq); |
16725b9d | 508 | fail_wb_wq: |
3d14c5d2 | 509 | destroy_workqueue(fsc->wb_wq); |
859e7b14 | 510 | fail_bdi: |
3d14c5d2 YS |
511 | bdi_destroy(&fsc->backing_dev_info); |
512 | fail_client: | |
513 | ceph_destroy_client(fsc->client); | |
16725b9d | 514 | fail: |
3d14c5d2 | 515 | kfree(fsc); |
16725b9d SW |
516 | return ERR_PTR(err); |
517 | } | |
518 | ||
0c6d4b4e | 519 | static void destroy_fs_client(struct ceph_fs_client *fsc) |
16725b9d | 520 | { |
3d14c5d2 | 521 | dout("destroy_fs_client %p\n", fsc); |
16725b9d | 522 | |
3d14c5d2 YS |
523 | destroy_workqueue(fsc->wb_wq); |
524 | destroy_workqueue(fsc->pg_inv_wq); | |
525 | destroy_workqueue(fsc->trunc_wq); | |
16725b9d | 526 | |
3d14c5d2 | 527 | bdi_destroy(&fsc->backing_dev_info); |
a922d38f | 528 | |
3d14c5d2 | 529 | mempool_destroy(fsc->wb_pagevec_pool); |
16725b9d | 530 | |
3d14c5d2 | 531 | destroy_mount_options(fsc->mount_options); |
5dfc589a | 532 | |
3d14c5d2 | 533 | ceph_fs_debugfs_cleanup(fsc); |
16725b9d | 534 | |
3d14c5d2 | 535 | ceph_destroy_client(fsc->client); |
16725b9d | 536 | |
3d14c5d2 YS |
537 | kfree(fsc); |
538 | dout("destroy_fs_client %p done\n", fsc); | |
16725b9d SW |
539 | } |
540 | ||
0743304d | 541 | /* |
3d14c5d2 | 542 | * caches |
0743304d | 543 | */ |
3d14c5d2 YS |
544 | struct kmem_cache *ceph_inode_cachep; |
545 | struct kmem_cache *ceph_cap_cachep; | |
546 | struct kmem_cache *ceph_dentry_cachep; | |
547 | struct kmem_cache *ceph_file_cachep; | |
548 | ||
549 | static void ceph_inode_init_once(void *foo) | |
0743304d | 550 | { |
3d14c5d2 YS |
551 | struct ceph_inode_info *ci = foo; |
552 | inode_init_once(&ci->vfs_inode); | |
553 | } | |
554 | ||
555 | static int __init init_caches(void) | |
556 | { | |
557 | ceph_inode_cachep = kmem_cache_create("ceph_inode_info", | |
558 | sizeof(struct ceph_inode_info), | |
559 | __alignof__(struct ceph_inode_info), | |
560 | (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), | |
561 | ceph_inode_init_once); | |
562 | if (ceph_inode_cachep == NULL) | |
563 | return -ENOMEM; | |
564 | ||
565 | ceph_cap_cachep = KMEM_CACHE(ceph_cap, | |
566 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); | |
567 | if (ceph_cap_cachep == NULL) | |
568 | goto bad_cap; | |
569 | ||
570 | ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, | |
571 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); | |
572 | if (ceph_dentry_cachep == NULL) | |
573 | goto bad_dentry; | |
574 | ||
575 | ceph_file_cachep = KMEM_CACHE(ceph_file_info, | |
576 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); | |
577 | if (ceph_file_cachep == NULL) | |
578 | goto bad_file; | |
579 | ||
0743304d | 580 | return 0; |
3d14c5d2 YS |
581 | |
582 | bad_file: | |
583 | kmem_cache_destroy(ceph_dentry_cachep); | |
584 | bad_dentry: | |
585 | kmem_cache_destroy(ceph_cap_cachep); | |
586 | bad_cap: | |
587 | kmem_cache_destroy(ceph_inode_cachep); | |
588 | return -ENOMEM; | |
0743304d SW |
589 | } |
590 | ||
3d14c5d2 YS |
591 | static void destroy_caches(void) |
592 | { | |
593 | kmem_cache_destroy(ceph_inode_cachep); | |
594 | kmem_cache_destroy(ceph_cap_cachep); | |
595 | kmem_cache_destroy(ceph_dentry_cachep); | |
596 | kmem_cache_destroy(ceph_file_cachep); | |
597 | } | |
598 | ||
599 | ||
16725b9d | 600 | /* |
3d14c5d2 YS |
601 | * ceph_umount_begin - initiate forced umount. Tear down down the |
602 | * mount, skipping steps that may hang while waiting for server(s). | |
16725b9d | 603 | */ |
3d14c5d2 | 604 | static void ceph_umount_begin(struct super_block *sb) |
16725b9d | 605 | { |
3d14c5d2 YS |
606 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); |
607 | ||
608 | dout("ceph_umount_begin - starting forced umount\n"); | |
609 | if (!fsc) | |
610 | return; | |
611 | fsc->mount_state = CEPH_MOUNT_SHUTDOWN; | |
612 | return; | |
16725b9d SW |
613 | } |
614 | ||
3d14c5d2 YS |
615 | static const struct super_operations ceph_super_ops = { |
616 | .alloc_inode = ceph_alloc_inode, | |
617 | .destroy_inode = ceph_destroy_inode, | |
618 | .write_inode = ceph_write_inode, | |
619 | .sync_fs = ceph_sync_fs, | |
620 | .put_super = ceph_put_super, | |
621 | .show_options = ceph_show_options, | |
622 | .statfs = ceph_statfs, | |
623 | .umount_begin = ceph_umount_begin, | |
624 | }; | |
625 | ||
16725b9d SW |
626 | /* |
627 | * Bootstrap mount by opening the root directory. Note the mount | |
628 | * @started time from caller, and time out if this takes too long. | |
629 | */ | |
3d14c5d2 | 630 | static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, |
16725b9d SW |
631 | const char *path, |
632 | unsigned long started) | |
633 | { | |
3d14c5d2 | 634 | struct ceph_mds_client *mdsc = fsc->mdsc; |
16725b9d SW |
635 | struct ceph_mds_request *req = NULL; |
636 | int err; | |
637 | struct dentry *root; | |
638 | ||
639 | /* open dir */ | |
640 | dout("open_root_inode opening '%s'\n", path); | |
641 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); | |
642 | if (IS_ERR(req)) | |
7e34bc52 | 643 | return ERR_CAST(req); |
16725b9d SW |
644 | req->r_path1 = kstrdup(path, GFP_NOFS); |
645 | req->r_ino1.ino = CEPH_INO_ROOT; | |
646 | req->r_ino1.snap = CEPH_NOSNAP; | |
647 | req->r_started = started; | |
3d14c5d2 | 648 | req->r_timeout = fsc->client->options->mount_timeout * HZ; |
16725b9d SW |
649 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); |
650 | req->r_num_caps = 2; | |
651 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
652 | if (err == 0) { | |
3c5184ef AV |
653 | struct inode *inode = req->r_target_inode; |
654 | req->r_target_inode = NULL; | |
16725b9d | 655 | dout("open_root_inode success\n"); |
3c5184ef | 656 | if (ceph_ino(inode) == CEPH_INO_ROOT && |
774ac21d | 657 | fsc->sb->s_root == NULL) { |
3c5184ef AV |
658 | root = d_alloc_root(inode); |
659 | if (!root) { | |
660 | iput(inode); | |
661 | root = ERR_PTR(-ENOMEM); | |
662 | goto out; | |
663 | } | |
774ac21d | 664 | } else { |
3c5184ef | 665 | root = d_obtain_alias(inode); |
774ac21d | 666 | } |
d46cfba5 | 667 | ceph_init_dentry(root); |
16725b9d SW |
668 | dout("open_root_inode success, root dentry is %p\n", root); |
669 | } else { | |
670 | root = ERR_PTR(err); | |
671 | } | |
3c5184ef | 672 | out: |
16725b9d SW |
673 | ceph_mdsc_put_request(req); |
674 | return root; | |
675 | } | |
676 | ||
3d14c5d2 YS |
677 | |
678 | ||
679 | ||
16725b9d SW |
680 | /* |
681 | * mount: join the ceph cluster, and open root directory. | |
682 | */ | |
a7f9fb20 | 683 | static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, |
16725b9d SW |
684 | const char *path) |
685 | { | |
16725b9d | 686 | int err; |
16725b9d SW |
687 | unsigned long started = jiffies; /* note the start time */ |
688 | struct dentry *root; | |
3d14c5d2 | 689 | int first = 0; /* first vfsmount for this super_block */ |
16725b9d SW |
690 | |
691 | dout("mount start\n"); | |
3d14c5d2 | 692 | mutex_lock(&fsc->client->mount_mutex); |
16725b9d | 693 | |
3d14c5d2 | 694 | err = __ceph_open_session(fsc->client, started); |
16725b9d SW |
695 | if (err < 0) |
696 | goto out; | |
697 | ||
16725b9d | 698 | dout("mount opening root\n"); |
3d14c5d2 | 699 | root = open_root_dentry(fsc, "", started); |
16725b9d SW |
700 | if (IS_ERR(root)) { |
701 | err = PTR_ERR(root); | |
702 | goto out; | |
703 | } | |
3d14c5d2 | 704 | if (fsc->sb->s_root) { |
16725b9d | 705 | dput(root); |
3d14c5d2 YS |
706 | } else { |
707 | fsc->sb->s_root = root; | |
708 | first = 1; | |
709 | ||
710 | err = ceph_fs_debugfs_init(fsc); | |
711 | if (err < 0) | |
712 | goto fail; | |
713 | } | |
16725b9d SW |
714 | |
715 | if (path[0] == 0) { | |
716 | dget(root); | |
717 | } else { | |
718 | dout("mount opening base mountpoint\n"); | |
3d14c5d2 | 719 | root = open_root_dentry(fsc, path, started); |
16725b9d SW |
720 | if (IS_ERR(root)) { |
721 | err = PTR_ERR(root); | |
3d14c5d2 | 722 | goto fail; |
16725b9d SW |
723 | } |
724 | } | |
725 | ||
3d14c5d2 | 726 | fsc->mount_state = CEPH_MOUNT_MOUNTED; |
16725b9d | 727 | dout("mount success\n"); |
a7f9fb20 AV |
728 | mutex_unlock(&fsc->client->mount_mutex); |
729 | return root; | |
16725b9d SW |
730 | |
731 | out: | |
3d14c5d2 | 732 | mutex_unlock(&fsc->client->mount_mutex); |
a7f9fb20 | 733 | return ERR_PTR(err); |
3d14c5d2 YS |
734 | |
735 | fail: | |
736 | if (first) { | |
737 | dput(fsc->sb->s_root); | |
738 | fsc->sb->s_root = NULL; | |
739 | } | |
740 | goto out; | |
16725b9d SW |
741 | } |
742 | ||
743 | static int ceph_set_super(struct super_block *s, void *data) | |
744 | { | |
3d14c5d2 | 745 | struct ceph_fs_client *fsc = data; |
16725b9d SW |
746 | int ret; |
747 | ||
748 | dout("set_super %p data %p\n", s, data); | |
749 | ||
3d14c5d2 | 750 | s->s_flags = fsc->mount_options->sb_flags; |
16725b9d SW |
751 | s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ |
752 | ||
3d14c5d2 YS |
753 | s->s_fs_info = fsc; |
754 | fsc->sb = s; | |
16725b9d SW |
755 | |
756 | s->s_op = &ceph_super_ops; | |
757 | s->s_export_op = &ceph_export_ops; | |
758 | ||
759 | s->s_time_gran = 1000; /* 1000 ns == 1 us */ | |
760 | ||
761 | ret = set_anon_super(s, NULL); /* what is that second arg for? */ | |
762 | if (ret != 0) | |
763 | goto fail; | |
764 | ||
765 | return ret; | |
766 | ||
767 | fail: | |
768 | s->s_fs_info = NULL; | |
3d14c5d2 | 769 | fsc->sb = NULL; |
16725b9d SW |
770 | return ret; |
771 | } | |
772 | ||
773 | /* | |
774 | * share superblock if same fs AND options | |
775 | */ | |
776 | static int ceph_compare_super(struct super_block *sb, void *data) | |
777 | { | |
3d14c5d2 YS |
778 | struct ceph_fs_client *new = data; |
779 | struct ceph_mount_options *fsopt = new->mount_options; | |
780 | struct ceph_options *opt = new->client->options; | |
781 | struct ceph_fs_client *other = ceph_sb_to_client(sb); | |
16725b9d SW |
782 | |
783 | dout("ceph_compare_super %p\n", sb); | |
3d14c5d2 YS |
784 | |
785 | if (compare_mount_options(fsopt, opt, other)) { | |
786 | dout("monitor(s)/mount options don't match\n"); | |
787 | return 0; | |
16725b9d | 788 | } |
3d14c5d2 YS |
789 | if ((opt->flags & CEPH_OPT_FSID) && |
790 | ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { | |
791 | dout("fsid doesn't match\n"); | |
792 | return 0; | |
793 | } | |
794 | if (fsopt->sb_flags != other->mount_options->sb_flags) { | |
16725b9d SW |
795 | dout("flags differ\n"); |
796 | return 0; | |
797 | } | |
798 | return 1; | |
799 | } | |
800 | ||
801 | /* | |
802 | * construct our own bdi so we can control readahead, etc. | |
803 | */ | |
00d5643e | 804 | static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); |
31e0cf8f | 805 | |
3d14c5d2 YS |
806 | static int ceph_register_bdi(struct super_block *sb, |
807 | struct ceph_fs_client *fsc) | |
16725b9d SW |
808 | { |
809 | int err; | |
810 | ||
83817e35 SW |
811 | /* set ra_pages based on rasize mount option? */ |
812 | if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) | |
3d14c5d2 | 813 | fsc->backing_dev_info.ra_pages = |
83817e35 | 814 | (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) |
16725b9d | 815 | >> PAGE_SHIFT; |
e9852227 YS |
816 | else |
817 | fsc->backing_dev_info.ra_pages = | |
818 | default_backing_dev_info.ra_pages; | |
819 | ||
3d14c5d2 | 820 | err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d", |
31e0cf8f | 821 | atomic_long_inc_return(&bdi_seq)); |
5dfc589a | 822 | if (!err) |
3d14c5d2 | 823 | sb->s_bdi = &fsc->backing_dev_info; |
16725b9d SW |
824 | return err; |
825 | } | |
826 | ||
a7f9fb20 AV |
827 | static struct dentry *ceph_mount(struct file_system_type *fs_type, |
828 | int flags, const char *dev_name, void *data) | |
16725b9d SW |
829 | { |
830 | struct super_block *sb; | |
3d14c5d2 | 831 | struct ceph_fs_client *fsc; |
a7f9fb20 | 832 | struct dentry *res; |
16725b9d SW |
833 | int err; |
834 | int (*compare_super)(struct super_block *, void *) = ceph_compare_super; | |
6a18be16 | 835 | const char *path = NULL; |
3d14c5d2 YS |
836 | struct ceph_mount_options *fsopt = NULL; |
837 | struct ceph_options *opt = NULL; | |
16725b9d | 838 | |
a7f9fb20 | 839 | dout("ceph_mount\n"); |
3d14c5d2 | 840 | err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); |
a7f9fb20 AV |
841 | if (err < 0) { |
842 | res = ERR_PTR(err); | |
6b805185 | 843 | goto out_final; |
a7f9fb20 | 844 | } |
16725b9d SW |
845 | |
846 | /* create client (which we may/may not use) */ | |
3d14c5d2 YS |
847 | fsc = create_fs_client(fsopt, opt); |
848 | if (IS_ERR(fsc)) { | |
a7f9fb20 | 849 | res = ERR_CAST(fsc); |
259a187a NW |
850 | destroy_mount_options(fsopt); |
851 | ceph_destroy_options(opt); | |
6b805185 SW |
852 | goto out_final; |
853 | } | |
16725b9d | 854 | |
3d14c5d2 | 855 | err = ceph_mdsc_init(fsc); |
a7f9fb20 AV |
856 | if (err < 0) { |
857 | res = ERR_PTR(err); | |
3d14c5d2 | 858 | goto out; |
a7f9fb20 | 859 | } |
3d14c5d2 YS |
860 | |
861 | if (ceph_test_opt(fsc->client, NOSHARE)) | |
16725b9d | 862 | compare_super = NULL; |
3d14c5d2 | 863 | sb = sget(fs_type, compare_super, ceph_set_super, fsc); |
16725b9d | 864 | if (IS_ERR(sb)) { |
a7f9fb20 | 865 | res = ERR_CAST(sb); |
16725b9d SW |
866 | goto out; |
867 | } | |
868 | ||
3d14c5d2 YS |
869 | if (ceph_sb_to_client(sb) != fsc) { |
870 | ceph_mdsc_destroy(fsc); | |
871 | destroy_fs_client(fsc); | |
872 | fsc = ceph_sb_to_client(sb); | |
873 | dout("get_sb got existing client %p\n", fsc); | |
16725b9d | 874 | } else { |
3d14c5d2 YS |
875 | dout("get_sb using new client %p\n", fsc); |
876 | err = ceph_register_bdi(sb, fsc); | |
a7f9fb20 AV |
877 | if (err < 0) { |
878 | res = ERR_PTR(err); | |
16725b9d | 879 | goto out_splat; |
a7f9fb20 | 880 | } |
16725b9d SW |
881 | } |
882 | ||
a7f9fb20 AV |
883 | res = ceph_real_mount(fsc, path); |
884 | if (IS_ERR(res)) | |
16725b9d | 885 | goto out_splat; |
a7f9fb20 AV |
886 | dout("root %p inode %p ino %llx.%llx\n", res, |
887 | res->d_inode, ceph_vinop(res->d_inode)); | |
888 | return res; | |
16725b9d SW |
889 | |
890 | out_splat: | |
3d14c5d2 | 891 | ceph_mdsc_close_sessions(fsc->mdsc); |
3981f2e2 | 892 | deactivate_locked_super(sb); |
16725b9d SW |
893 | goto out_final; |
894 | ||
895 | out: | |
3d14c5d2 YS |
896 | ceph_mdsc_destroy(fsc); |
897 | destroy_fs_client(fsc); | |
16725b9d | 898 | out_final: |
a7f9fb20 AV |
899 | dout("ceph_mount fail %ld\n", PTR_ERR(res)); |
900 | return res; | |
16725b9d SW |
901 | } |
902 | ||
903 | static void ceph_kill_sb(struct super_block *s) | |
904 | { | |
3d14c5d2 | 905 | struct ceph_fs_client *fsc = ceph_sb_to_client(s); |
16725b9d | 906 | dout("kill_sb %p\n", s); |
3d14c5d2 | 907 | ceph_mdsc_pre_umount(fsc->mdsc); |
16725b9d | 908 | kill_anon_super(s); /* will call put_super after sb is r/o */ |
3d14c5d2 YS |
909 | ceph_mdsc_destroy(fsc); |
910 | destroy_fs_client(fsc); | |
16725b9d SW |
911 | } |
912 | ||
913 | static struct file_system_type ceph_fs_type = { | |
914 | .owner = THIS_MODULE, | |
915 | .name = "ceph", | |
a7f9fb20 | 916 | .mount = ceph_mount, |
16725b9d SW |
917 | .kill_sb = ceph_kill_sb, |
918 | .fs_flags = FS_RENAME_DOES_D_MOVE, | |
919 | }; | |
920 | ||
921 | #define _STRINGIFY(x) #x | |
922 | #define STRINGIFY(x) _STRINGIFY(x) | |
923 | ||
924 | static int __init init_ceph(void) | |
925 | { | |
3d14c5d2 | 926 | int ret = init_caches(); |
16725b9d | 927 | if (ret) |
3d14c5d2 | 928 | goto out; |
16725b9d | 929 | |
3ce6cd12 | 930 | ceph_xattr_init(); |
16725b9d SW |
931 | ret = register_filesystem(&ceph_fs_type); |
932 | if (ret) | |
933 | goto out_icache; | |
934 | ||
3d14c5d2 YS |
935 | pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); |
936 | ||
16725b9d SW |
937 | return 0; |
938 | ||
939 | out_icache: | |
3ce6cd12 | 940 | ceph_xattr_exit(); |
16725b9d | 941 | destroy_caches(); |
16725b9d SW |
942 | out: |
943 | return ret; | |
944 | } | |
945 | ||
946 | static void __exit exit_ceph(void) | |
947 | { | |
948 | dout("exit_ceph\n"); | |
949 | unregister_filesystem(&ceph_fs_type); | |
3ce6cd12 | 950 | ceph_xattr_exit(); |
16725b9d | 951 | destroy_caches(); |
16725b9d SW |
952 | } |
953 | ||
954 | module_init(init_ceph); | |
955 | module_exit(exit_ceph); | |
956 | ||
957 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
958 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
959 | MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); | |
960 | MODULE_DESCRIPTION("Ceph filesystem for Linux"); | |
961 | MODULE_LICENSE("GPL"); |