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ba9e5e98 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
ba9e5e98 BH |
4 | * Copyright (C) 2008, 2009 |
5 | * Boaz Harrosh <bharrosh@panasas.com> | |
6 | * | |
7 | * Copyrights for code taken from ext2: | |
8 | * Copyright (C) 1992, 1993, 1994, 1995 | |
9 | * Remy Card (card@masi.ibp.fr) | |
10 | * Laboratoire MASI - Institut Blaise Pascal | |
11 | * Universite Pierre et Marie Curie (Paris VI) | |
12 | * from | |
13 | * linux/fs/minix/inode.c | |
14 | * Copyright (C) 1991, 1992 Linus Torvalds | |
15 | * | |
16 | * This file is part of exofs. | |
17 | * | |
18 | * exofs is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation. Since it is based on ext2, and the only | |
21 | * valid version of GPL for the Linux kernel is version 2, the only valid | |
22 | * version of GPL for exofs is version 2. | |
23 | * | |
24 | * exofs is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with exofs; if not, write to the Free Software | |
31 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
32 | */ | |
33 | ||
34 | #include <linux/string.h> | |
35 | #include <linux/parser.h> | |
36 | #include <linux/vfs.h> | |
37 | #include <linux/random.h> | |
143cb494 | 38 | #include <linux/module.h> |
8cf74b39 | 39 | #include <linux/exportfs.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
ba9e5e98 BH |
41 | |
42 | #include "exofs.h" | |
43 | ||
85e44df4 BH |
44 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
45 | ||
ba9e5e98 BH |
46 | /****************************************************************************** |
47 | * MOUNT OPTIONS | |
48 | *****************************************************************************/ | |
49 | ||
50 | /* | |
51 | * struct to hold what we get from mount options | |
52 | */ | |
53 | struct exofs_mountopt { | |
9ed96484 | 54 | bool is_osdname; |
ba9e5e98 BH |
55 | const char *dev_name; |
56 | uint64_t pid; | |
57 | int timeout; | |
58 | }; | |
59 | ||
60 | /* | |
61 | * exofs-specific mount-time options. | |
62 | */ | |
9ed96484 | 63 | enum { Opt_name, Opt_pid, Opt_to, Opt_err }; |
ba9e5e98 BH |
64 | |
65 | /* | |
66 | * Our mount-time options. These should ideally be 64-bit unsigned, but the | |
67 | * kernel's parsing functions do not currently support that. 32-bit should be | |
68 | * sufficient for most applications now. | |
69 | */ | |
70 | static match_table_t tokens = { | |
9ed96484 | 71 | {Opt_name, "osdname=%s"}, |
ba9e5e98 BH |
72 | {Opt_pid, "pid=%u"}, |
73 | {Opt_to, "to=%u"}, | |
74 | {Opt_err, NULL} | |
75 | }; | |
76 | ||
77 | /* | |
78 | * The main option parsing method. Also makes sure that all of the mandatory | |
79 | * mount options were set. | |
80 | */ | |
81 | static int parse_options(char *options, struct exofs_mountopt *opts) | |
82 | { | |
83 | char *p; | |
84 | substring_t args[MAX_OPT_ARGS]; | |
85 | int option; | |
86 | bool s_pid = false; | |
87 | ||
88 | EXOFS_DBGMSG("parse_options %s\n", options); | |
89 | /* defaults */ | |
90 | memset(opts, 0, sizeof(*opts)); | |
91 | opts->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
92 | ||
93 | while ((p = strsep(&options, ",")) != NULL) { | |
94 | int token; | |
95 | char str[32]; | |
96 | ||
97 | if (!*p) | |
98 | continue; | |
99 | ||
100 | token = match_token(p, tokens, args); | |
101 | switch (token) { | |
9ed96484 BH |
102 | case Opt_name: |
103 | opts->dev_name = match_strdup(&args[0]); | |
104 | if (unlikely(!opts->dev_name)) { | |
105 | EXOFS_ERR("Error allocating dev_name"); | |
106 | return -ENOMEM; | |
107 | } | |
108 | opts->is_osdname = true; | |
109 | break; | |
ba9e5e98 BH |
110 | case Opt_pid: |
111 | if (0 == match_strlcpy(str, &args[0], sizeof(str))) | |
112 | return -EINVAL; | |
113 | opts->pid = simple_strtoull(str, NULL, 0); | |
114 | if (opts->pid < EXOFS_MIN_PID) { | |
115 | EXOFS_ERR("Partition ID must be >= %u", | |
116 | EXOFS_MIN_PID); | |
117 | return -EINVAL; | |
118 | } | |
119 | s_pid = 1; | |
120 | break; | |
121 | case Opt_to: | |
122 | if (match_int(&args[0], &option)) | |
123 | return -EINVAL; | |
124 | if (option <= 0) { | |
125 | EXOFS_ERR("Timout must be > 0"); | |
126 | return -EINVAL; | |
127 | } | |
128 | opts->timeout = option * HZ; | |
129 | break; | |
130 | } | |
131 | } | |
132 | ||
133 | if (!s_pid) { | |
134 | EXOFS_ERR("Need to specify the following options:\n"); | |
135 | EXOFS_ERR(" -o pid=pid_no_to_use\n"); | |
136 | return -EINVAL; | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | /****************************************************************************** | |
143 | * INODE CACHE | |
144 | *****************************************************************************/ | |
145 | ||
146 | /* | |
147 | * Our inode cache. Isn't it pretty? | |
148 | */ | |
149 | static struct kmem_cache *exofs_inode_cachep; | |
150 | ||
151 | /* | |
152 | * Allocate an inode in the cache | |
153 | */ | |
154 | static struct inode *exofs_alloc_inode(struct super_block *sb) | |
155 | { | |
156 | struct exofs_i_info *oi; | |
157 | ||
158 | oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL); | |
159 | if (!oi) | |
160 | return NULL; | |
161 | ||
162 | oi->vfs_inode.i_version = 1; | |
163 | return &oi->vfs_inode; | |
164 | } | |
165 | ||
fa0d7e3d NP |
166 | static void exofs_i_callback(struct rcu_head *head) |
167 | { | |
168 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
169 | kmem_cache_free(exofs_inode_cachep, exofs_i(inode)); |
170 | } | |
171 | ||
ba9e5e98 BH |
172 | /* |
173 | * Remove an inode from the cache | |
174 | */ | |
175 | static void exofs_destroy_inode(struct inode *inode) | |
176 | { | |
fa0d7e3d | 177 | call_rcu(&inode->i_rcu, exofs_i_callback); |
ba9e5e98 BH |
178 | } |
179 | ||
180 | /* | |
181 | * Initialize the inode | |
182 | */ | |
183 | static void exofs_init_once(void *foo) | |
184 | { | |
185 | struct exofs_i_info *oi = foo; | |
186 | ||
187 | inode_init_once(&oi->vfs_inode); | |
188 | } | |
189 | ||
190 | /* | |
191 | * Create and initialize the inode cache | |
192 | */ | |
193 | static int init_inodecache(void) | |
194 | { | |
195 | exofs_inode_cachep = kmem_cache_create("exofs_inode_cache", | |
196 | sizeof(struct exofs_i_info), 0, | |
197 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
198 | exofs_init_once); | |
199 | if (exofs_inode_cachep == NULL) | |
200 | return -ENOMEM; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Destroy the inode cache | |
206 | */ | |
207 | static void destroy_inodecache(void) | |
208 | { | |
209 | kmem_cache_destroy(exofs_inode_cachep); | |
210 | } | |
211 | ||
212 | /****************************************************************************** | |
85e44df4 | 213 | * Some osd helpers |
ba9e5e98 | 214 | *****************************************************************************/ |
85e44df4 BH |
215 | void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj) |
216 | { | |
217 | osd_sec_init_nosec_doall_caps(cred_a, obj, false, true); | |
218 | } | |
219 | ||
220 | static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, | |
221 | u64 offset, void *p, unsigned length) | |
222 | { | |
223 | struct osd_request *or = osd_start_request(od, GFP_KERNEL); | |
224 | /* struct osd_sense_info osi = {.key = 0};*/ | |
225 | int ret; | |
226 | ||
227 | if (unlikely(!or)) { | |
228 | EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__); | |
229 | return -ENOMEM; | |
230 | } | |
231 | ret = osd_req_read_kern(or, obj, offset, p, length); | |
232 | if (unlikely(ret)) { | |
233 | EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__); | |
234 | goto out; | |
235 | } | |
236 | ||
237 | ret = osd_finalize_request(or, 0, cred, NULL); | |
238 | if (unlikely(ret)) { | |
239 | EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret); | |
240 | goto out; | |
241 | } | |
242 | ||
243 | ret = osd_execute_request(or); | |
244 | if (unlikely(ret)) | |
245 | EXOFS_DBGMSG("osd_execute_request() => %d\n", ret); | |
246 | /* osd_req_decode_sense(or, ret); */ | |
247 | ||
248 | out: | |
249 | osd_end_request(or); | |
250 | EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx " | |
251 | "length=0x%llx dev=%p ret=>%d\n", | |
252 | _LLU(obj->id), _LLU(offset), _LLU(length), od, ret); | |
253 | return ret; | |
254 | } | |
255 | ||
1cea312a BH |
256 | static const struct osd_attr g_attr_sb_stats = ATTR_DEF( |
257 | EXOFS_APAGE_SB_DATA, | |
258 | EXOFS_ATTR_SB_STATS, | |
259 | sizeof(struct exofs_sb_stats)); | |
260 | ||
261 | static int __sbi_read_stats(struct exofs_sb_info *sbi) | |
262 | { | |
263 | struct osd_attr attrs[] = { | |
264 | [0] = g_attr_sb_stats, | |
265 | }; | |
8ff660ab | 266 | struct ore_io_state *ios; |
1cea312a BH |
267 | int ret; |
268 | ||
5bf696da | 269 | ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); |
1cea312a | 270 | if (unlikely(ret)) { |
8ff660ab | 271 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
1cea312a BH |
272 | return ret; |
273 | } | |
274 | ||
1cea312a BH |
275 | ios->in_attr = attrs; |
276 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
277 | ||
8ff660ab | 278 | ret = ore_read(ios); |
1cea312a BH |
279 | if (unlikely(ret)) { |
280 | EXOFS_ERR("Error reading super_block stats => %d\n", ret); | |
281 | goto out; | |
282 | } | |
283 | ||
284 | ret = extract_attr_from_ios(ios, &attrs[0]); | |
285 | if (ret) { | |
286 | EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__); | |
287 | goto out; | |
288 | } | |
289 | if (attrs[0].len) { | |
290 | struct exofs_sb_stats *ess; | |
291 | ||
292 | if (unlikely(attrs[0].len != sizeof(*ess))) { | |
293 | EXOFS_ERR("%s: Wrong version of exofs_sb_stats " | |
294 | "size(%d) != expected(%zd)\n", | |
295 | __func__, attrs[0].len, sizeof(*ess)); | |
296 | goto out; | |
297 | } | |
298 | ||
299 | ess = attrs[0].val_ptr; | |
300 | sbi->s_nextid = le64_to_cpu(ess->s_nextid); | |
301 | sbi->s_numfiles = le32_to_cpu(ess->s_numfiles); | |
302 | } | |
303 | ||
304 | out: | |
8ff660ab | 305 | ore_put_io_state(ios); |
1cea312a BH |
306 | return ret; |
307 | } | |
308 | ||
8ff660ab | 309 | static void stats_done(struct ore_io_state *ios, void *p) |
1cea312a | 310 | { |
8ff660ab | 311 | ore_put_io_state(ios); |
1cea312a BH |
312 | /* Good thanks nothing to do anymore */ |
313 | } | |
314 | ||
315 | /* Asynchronously write the stats attribute */ | |
316 | int exofs_sbi_write_stats(struct exofs_sb_info *sbi) | |
317 | { | |
318 | struct osd_attr attrs[] = { | |
319 | [0] = g_attr_sb_stats, | |
320 | }; | |
8ff660ab | 321 | struct ore_io_state *ios; |
1cea312a BH |
322 | int ret; |
323 | ||
5bf696da | 324 | ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); |
1cea312a | 325 | if (unlikely(ret)) { |
8ff660ab | 326 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
1cea312a BH |
327 | return ret; |
328 | } | |
329 | ||
330 | sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid); | |
331 | sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles); | |
332 | attrs[0].val_ptr = &sbi->s_ess; | |
333 | ||
9e9db456 | 334 | |
1cea312a BH |
335 | ios->done = stats_done; |
336 | ios->private = sbi; | |
337 | ios->out_attr = attrs; | |
338 | ios->out_attr_len = ARRAY_SIZE(attrs); | |
339 | ||
8ff660ab | 340 | ret = ore_write(ios); |
1cea312a | 341 | if (unlikely(ret)) { |
8ff660ab BH |
342 | EXOFS_ERR("%s: ore_write failed.\n", __func__); |
343 | ore_put_io_state(ios); | |
1cea312a BH |
344 | } |
345 | ||
346 | return ret; | |
347 | } | |
348 | ||
85e44df4 BH |
349 | /****************************************************************************** |
350 | * SUPERBLOCK FUNCTIONS | |
351 | *****************************************************************************/ | |
352 | static const struct super_operations exofs_sops; | |
353 | static const struct export_operations exofs_export_ops; | |
354 | ||
ba9e5e98 BH |
355 | /* |
356 | * Write the superblock to the OSD | |
357 | */ | |
de74b05a | 358 | static int exofs_sync_fs(struct super_block *sb, int wait) |
ba9e5e98 BH |
359 | { |
360 | struct exofs_sb_info *sbi; | |
361 | struct exofs_fscb *fscb; | |
8ff660ab | 362 | struct ore_comp one_comp; |
5bf696da | 363 | struct ore_components oc; |
8ff660ab | 364 | struct ore_io_state *ios; |
80e09fb9 | 365 | int ret = -ENOMEM; |
ba9e5e98 | 366 | |
1cea312a BH |
367 | fscb = kmalloc(sizeof(*fscb), GFP_KERNEL); |
368 | if (unlikely(!fscb)) | |
369 | return -ENOMEM; | |
370 | ||
ba9e5e98 | 371 | sbi = sb->s_fs_info; |
06886a5a | 372 | |
1cea312a BH |
373 | /* NOTE: We no longer dirty the super_block anywhere in exofs. The |
374 | * reason we write the fscb here on unmount is so we can stay backwards | |
375 | * compatible with fscb->s_version == 1. (What we are not compatible | |
376 | * with is if a new version FS crashed and then we try to mount an old | |
377 | * version). Otherwise the exofs_fscb is read-only from mkfs time. All | |
378 | * the writeable info is set in exofs_sbi_write_stats() above. | |
379 | */ | |
9e9db456 | 380 | |
5bf696da | 381 | exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID); |
9e9db456 | 382 | |
5bf696da | 383 | ret = ore_get_io_state(&sbi->layout, &oc, &ios); |
1cea312a | 384 | if (unlikely(ret)) |
06886a5a BH |
385 | goto out; |
386 | ||
1cea312a BH |
387 | lock_super(sb); |
388 | ||
04dc1e88 | 389 | ios->length = offsetof(struct exofs_fscb, s_dev_table_oid); |
06886a5a | 390 | memset(fscb, 0, ios->length); |
ba9e5e98 | 391 | fscb->s_nextid = cpu_to_le64(sbi->s_nextid); |
b6d1f2dd | 392 | fscb->s_numfiles = cpu_to_le64(sbi->s_numfiles); |
ba9e5e98 BH |
393 | fscb->s_magic = cpu_to_le16(sb->s_magic); |
394 | fscb->s_newfs = 0; | |
04dc1e88 | 395 | fscb->s_version = EXOFS_FSCB_VER; |
ba9e5e98 | 396 | |
06886a5a BH |
397 | ios->offset = 0; |
398 | ios->kern_buff = fscb; | |
ba9e5e98 | 399 | |
8ff660ab | 400 | ret = ore_write(ios); |
1cea312a | 401 | if (unlikely(ret)) |
8ff660ab | 402 | EXOFS_ERR("%s: ore_write failed.\n", __func__); |
1cea312a BH |
403 | else |
404 | sb->s_dirt = 0; | |
405 | ||
ba9e5e98 | 406 | |
1cea312a | 407 | unlock_super(sb); |
ba9e5e98 | 408 | out: |
06886a5a | 409 | EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret); |
8ff660ab | 410 | ore_put_io_state(ios); |
1cea312a | 411 | kfree(fscb); |
80e09fb9 CH |
412 | return ret; |
413 | } | |
414 | ||
415 | static void exofs_write_super(struct super_block *sb) | |
416 | { | |
417 | if (!(sb->s_flags & MS_RDONLY)) | |
418 | exofs_sync_fs(sb, 1); | |
419 | else | |
420 | sb->s_dirt = 0; | |
ba9e5e98 BH |
421 | } |
422 | ||
19fe294f BH |
423 | static void _exofs_print_device(const char *msg, const char *dev_path, |
424 | struct osd_dev *od, u64 pid) | |
425 | { | |
426 | const struct osd_dev_info *odi = osduld_device_info(od); | |
427 | ||
428 | printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n", | |
429 | msg, dev_path ?: "", odi->osdname, _LLU(pid)); | |
430 | } | |
431 | ||
de74b05a | 432 | static void exofs_free_sbi(struct exofs_sb_info *sbi) |
04dc1e88 | 433 | { |
d866d875 BH |
434 | unsigned numdevs = sbi->oc.numdevs; |
435 | ||
436 | while (numdevs) { | |
437 | unsigned i = --numdevs; | |
438 | struct osd_dev *od = ore_comp_dev(&sbi->oc, i); | |
04dc1e88 BH |
439 | |
440 | if (od) { | |
d866d875 | 441 | ore_comp_set_dev(&sbi->oc, i, NULL); |
04dc1e88 BH |
442 | osduld_put_device(od); |
443 | } | |
444 | } | |
d866d875 | 445 | kfree(sbi->oc.ods); |
04dc1e88 BH |
446 | kfree(sbi); |
447 | } | |
448 | ||
ba9e5e98 BH |
449 | /* |
450 | * This function is called when the vfs is freeing the superblock. We just | |
451 | * need to free our own part. | |
452 | */ | |
453 | static void exofs_put_super(struct super_block *sb) | |
454 | { | |
455 | int num_pend; | |
456 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
457 | ||
458 | /* make sure there are no pending commands */ | |
459 | for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0; | |
460 | num_pend = atomic_read(&sbi->s_curr_pending)) { | |
461 | wait_queue_head_t wq; | |
a49fb4c3 BH |
462 | |
463 | printk(KERN_NOTICE "%s: !!Pending operations in flight. " | |
464 | "This is a BUG. please report to osd-dev@open-osd.org\n", | |
465 | __func__); | |
ba9e5e98 BH |
466 | init_waitqueue_head(&wq); |
467 | wait_event_timeout(wq, | |
468 | (atomic_read(&sbi->s_curr_pending) == 0), | |
469 | msecs_to_jiffies(100)); | |
470 | } | |
471 | ||
d866d875 | 472 | _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0), |
9e9db456 | 473 | sbi->one_comp.obj.partition); |
04dc1e88 | 474 | |
8b56a30c | 475 | exofs_sysfs_sb_del(sbi); |
b3d0ab7e | 476 | bdi_destroy(&sbi->bdi); |
04dc1e88 | 477 | exofs_free_sbi(sbi); |
ba9e5e98 BH |
478 | sb->s_fs_info = NULL; |
479 | } | |
480 | ||
04dc1e88 BH |
481 | static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, |
482 | struct exofs_device_table *dt) | |
483 | { | |
5a51c0c7 | 484 | int ret; |
5d952b83 | 485 | |
8d2d83a8 | 486 | sbi->layout.stripe_unit = |
04dc1e88 | 487 | le64_to_cpu(dt->dt_data_map.cb_stripe_unit); |
8d2d83a8 | 488 | sbi->layout.group_width = |
04dc1e88 | 489 | le32_to_cpu(dt->dt_data_map.cb_group_width); |
8d2d83a8 | 490 | sbi->layout.group_depth = |
04dc1e88 | 491 | le32_to_cpu(dt->dt_data_map.cb_group_depth); |
8d2d83a8 BH |
492 | sbi->layout.mirrors_p1 = |
493 | le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1; | |
494 | sbi->layout.raid_algorithm = | |
04dc1e88 BH |
495 | le32_to_cpu(dt->dt_data_map.cb_raid_algorithm); |
496 | ||
5a51c0c7 | 497 | ret = ore_verify_layout(numdevs, &sbi->layout); |
5d952b83 | 498 | |
6d4073e8 BH |
499 | EXOFS_DBGMSG("exofs: layout: " |
500 | "num_comps=%u stripe_unit=0x%x group_width=%u " | |
501 | "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n", | |
502 | numdevs, | |
503 | sbi->layout.stripe_unit, | |
504 | sbi->layout.group_width, | |
505 | _LLU(sbi->layout.group_depth), | |
506 | sbi->layout.mirrors_p1, | |
8d2d83a8 | 507 | sbi->layout.raid_algorithm); |
5a51c0c7 | 508 | return ret; |
04dc1e88 BH |
509 | } |
510 | ||
8ff660ab | 511 | static unsigned __ra_pages(struct ore_layout *layout) |
66cd6cad | 512 | { |
513 | const unsigned _MIN_RA = 32; /* min 128K read-ahead */ | |
514 | unsigned ra_pages = layout->group_width * layout->stripe_unit / | |
515 | PAGE_SIZE; | |
516 | unsigned max_io_pages = exofs_max_io_pages(layout, ~0); | |
517 | ||
518 | ra_pages *= 2; /* two stripes */ | |
519 | if (ra_pages < _MIN_RA) | |
520 | ra_pages = roundup(_MIN_RA, ra_pages / 2); | |
521 | ||
522 | if (ra_pages > max_io_pages) | |
523 | ra_pages = max_io_pages; | |
524 | ||
525 | return ra_pages; | |
526 | } | |
527 | ||
04dc1e88 BH |
528 | /* @odi is valid only as long as @fscb_dev is valid */ |
529 | static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev, | |
530 | struct osd_dev_info *odi) | |
531 | { | |
532 | odi->systemid_len = le32_to_cpu(dt_dev->systemid_len); | |
72749a27 DC |
533 | if (likely(odi->systemid_len)) |
534 | memcpy(odi->systemid, dt_dev->systemid, OSD_SYSTEMID_LEN); | |
04dc1e88 BH |
535 | |
536 | odi->osdname_len = le32_to_cpu(dt_dev->osdname_len); | |
537 | odi->osdname = dt_dev->osdname; | |
538 | ||
539 | /* FIXME support long names. Will need a _put function */ | |
540 | if (dt_dev->long_name_offset) | |
541 | return -EINVAL; | |
542 | ||
543 | /* Make sure osdname is printable! | |
544 | * mkexofs should give us space for a null-terminator else the | |
545 | * device-table is invalid. | |
546 | */ | |
547 | if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname))) | |
548 | odi->osdname_len = sizeof(dt_dev->osdname) - 1; | |
549 | dt_dev->osdname[odi->osdname_len] = 0; | |
550 | ||
551 | /* If it's all zeros something is bad we read past end-of-obj */ | |
552 | return !(odi->systemid_len || odi->osdname_len); | |
553 | } | |
554 | ||
d866d875 BH |
555 | int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs, |
556 | struct exofs_dev **peds) | |
557 | { | |
558 | struct __alloc_ore_devs_and_exofs_devs { | |
559 | /* Twice bigger table: See exofs_init_comps() and comment at | |
560 | * exofs_read_lookup_dev_table() | |
561 | */ | |
562 | struct ore_dev *oreds[numdevs * 2 - 1]; | |
563 | struct exofs_dev eds[numdevs]; | |
564 | } *aoded; | |
565 | struct exofs_dev *eds; | |
566 | unsigned i; | |
567 | ||
568 | aoded = kzalloc(sizeof(*aoded), GFP_KERNEL); | |
569 | if (unlikely(!aoded)) { | |
3e57638b | 570 | EXOFS_ERR("ERROR: failed allocating Device array[%d]\n", |
d866d875 BH |
571 | numdevs); |
572 | return -ENOMEM; | |
573 | } | |
574 | ||
575 | sbi->oc.ods = aoded->oreds; | |
576 | *peds = eds = aoded->eds; | |
577 | for (i = 0; i < numdevs; ++i) | |
578 | aoded->oreds[i] = &eds[i].ored; | |
579 | return 0; | |
580 | } | |
581 | ||
6d4073e8 BH |
582 | static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi, |
583 | struct osd_dev *fscb_od, | |
04dc1e88 BH |
584 | unsigned table_count) |
585 | { | |
8ff660ab | 586 | struct ore_comp comp; |
04dc1e88 | 587 | struct exofs_device_table *dt; |
d866d875 | 588 | struct exofs_dev *eds; |
04dc1e88 BH |
589 | unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) + |
590 | sizeof(*dt); | |
591 | unsigned numdevs, i; | |
592 | int ret; | |
593 | ||
594 | dt = kmalloc(table_bytes, GFP_KERNEL); | |
595 | if (unlikely(!dt)) { | |
596 | EXOFS_ERR("ERROR: allocating %x bytes for device table\n", | |
597 | table_bytes); | |
598 | return -ENOMEM; | |
599 | } | |
600 | ||
5bf696da | 601 | sbi->oc.numdevs = 0; |
9e9db456 BH |
602 | |
603 | comp.obj.partition = sbi->one_comp.obj.partition; | |
604 | comp.obj.id = EXOFS_DEVTABLE_ID; | |
605 | exofs_make_credential(comp.cred, &comp.obj); | |
606 | ||
607 | ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt, | |
608 | table_bytes); | |
04dc1e88 BH |
609 | if (unlikely(ret)) { |
610 | EXOFS_ERR("ERROR: reading device table\n"); | |
611 | goto out; | |
612 | } | |
613 | ||
614 | numdevs = le64_to_cpu(dt->dt_num_devices); | |
615 | if (unlikely(!numdevs)) { | |
616 | ret = -EINVAL; | |
617 | goto out; | |
618 | } | |
619 | WARN_ON(table_count != numdevs); | |
620 | ||
621 | ret = _read_and_match_data_map(sbi, numdevs, dt); | |
622 | if (unlikely(ret)) | |
623 | goto out; | |
624 | ||
d866d875 BH |
625 | ret = __alloc_dev_table(sbi, numdevs, &eds); |
626 | if (unlikely(ret)) | |
627 | goto out; | |
628 | /* exofs round-robins the device table view according to inode | |
629 | * number. We hold a: twice bigger table hence inodes can point | |
630 | * to any device and have a sequential view of the table | |
631 | * starting at this device. See exofs_init_comps() | |
632 | */ | |
633 | memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0], | |
634 | (numdevs - 1) * sizeof(sbi->oc.ods[0])); | |
04dc1e88 | 635 | |
8b56a30c SB |
636 | /* create sysfs subdir under which we put the device table |
637 | * And cluster layout. A Superblock is identified by the string: | |
638 | * "dev[0].osdname"_"pid" | |
639 | */ | |
640 | exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]); | |
641 | ||
04dc1e88 BH |
642 | for (i = 0; i < numdevs; i++) { |
643 | struct exofs_fscb fscb; | |
644 | struct osd_dev_info odi; | |
645 | struct osd_dev *od; | |
646 | ||
647 | if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) { | |
648 | EXOFS_ERR("ERROR: Read all-zeros device entry\n"); | |
649 | ret = -EINVAL; | |
650 | goto out; | |
651 | } | |
652 | ||
653 | printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n", | |
654 | i, odi.osdname); | |
655 | ||
d866d875 BH |
656 | /* the exofs id is currently the table index */ |
657 | eds[i].did = i; | |
658 | ||
04dc1e88 BH |
659 | /* On all devices the device table is identical. The user can |
660 | * specify any one of the participating devices on the command | |
661 | * line. We always keep them in device-table order. | |
662 | */ | |
663 | if (fscb_od && osduld_device_same(fscb_od, &odi)) { | |
d866d875 | 664 | eds[i].ored.od = fscb_od; |
5bf696da | 665 | ++sbi->oc.numdevs; |
04dc1e88 | 666 | fscb_od = NULL; |
8b56a30c | 667 | exofs_sysfs_odev_add(&eds[i], sbi); |
04dc1e88 BH |
668 | continue; |
669 | } | |
670 | ||
671 | od = osduld_info_lookup(&odi); | |
2c722c9a | 672 | if (IS_ERR(od)) { |
04dc1e88 BH |
673 | ret = PTR_ERR(od); |
674 | EXOFS_ERR("ERROR: device requested is not found " | |
675 | "osd_name-%s =>%d\n", odi.osdname, ret); | |
676 | goto out; | |
677 | } | |
678 | ||
d866d875 | 679 | eds[i].ored.od = od; |
5bf696da | 680 | ++sbi->oc.numdevs; |
04dc1e88 BH |
681 | |
682 | /* Read the fscb of the other devices to make sure the FS | |
683 | * partition is there. | |
684 | */ | |
9e9db456 | 685 | ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, |
04dc1e88 BH |
686 | sizeof(fscb)); |
687 | if (unlikely(ret)) { | |
688 | EXOFS_ERR("ERROR: Malformed participating device " | |
689 | "error reading fscb osd_name-%s\n", | |
690 | odi.osdname); | |
691 | goto out; | |
692 | } | |
8b56a30c | 693 | exofs_sysfs_odev_add(&eds[i], sbi); |
04dc1e88 BH |
694 | |
695 | /* TODO: verify other information is correct and FS-uuid | |
696 | * matches. Benny what did you say about device table | |
697 | * generation and old devices? | |
698 | */ | |
699 | } | |
700 | ||
701 | out: | |
702 | kfree(dt); | |
d866d875 | 703 | if (unlikely(fscb_od && !ret)) { |
9e9db456 BH |
704 | EXOFS_ERR("ERROR: Bad device-table container device not present\n"); |
705 | osduld_put_device(fscb_od); | |
706 | return -EINVAL; | |
9e9db456 | 707 | } |
04dc1e88 BH |
708 | return ret; |
709 | } | |
710 | ||
ba9e5e98 BH |
711 | /* |
712 | * Read the superblock from the OSD and fill in the fields | |
713 | */ | |
714 | static int exofs_fill_super(struct super_block *sb, void *data, int silent) | |
715 | { | |
716 | struct inode *root; | |
717 | struct exofs_mountopt *opts = data; | |
718 | struct exofs_sb_info *sbi; /*extended info */ | |
06886a5a | 719 | struct osd_dev *od; /* Master device */ |
ba9e5e98 | 720 | struct exofs_fscb fscb; /*on-disk superblock info */ |
8ff660ab | 721 | struct ore_comp comp; |
04dc1e88 | 722 | unsigned table_count; |
ba9e5e98 BH |
723 | int ret; |
724 | ||
725 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
726 | if (!sbi) | |
727 | return -ENOMEM; | |
ba9e5e98 BH |
728 | |
729 | /* use mount options to fill superblock */ | |
9ed96484 BH |
730 | if (opts->is_osdname) { |
731 | struct osd_dev_info odi = {.systemid_len = 0}; | |
732 | ||
733 | odi.osdname_len = strlen(opts->dev_name); | |
734 | odi.osdname = (u8 *)opts->dev_name; | |
735 | od = osduld_info_lookup(&odi); | |
9ce73047 BH |
736 | kfree(opts->dev_name); |
737 | opts->dev_name = NULL; | |
9ed96484 BH |
738 | } else { |
739 | od = osduld_path_lookup(opts->dev_name); | |
740 | } | |
06886a5a | 741 | if (IS_ERR(od)) { |
9ed96484 | 742 | ret = -EINVAL; |
ba9e5e98 BH |
743 | goto free_sbi; |
744 | } | |
745 | ||
45d3abcb | 746 | /* Default layout in case we do not have a device-table */ |
5d952b83 BH |
747 | sbi->layout.stripe_unit = PAGE_SIZE; |
748 | sbi->layout.mirrors_p1 = 1; | |
749 | sbi->layout.group_width = 1; | |
50a76fd3 BH |
750 | sbi->layout.group_depth = -1; |
751 | sbi->layout.group_count = 1; | |
ba9e5e98 BH |
752 | sbi->s_timeout = opts->timeout; |
753 | ||
9e9db456 BH |
754 | sbi->one_comp.obj.partition = opts->pid; |
755 | sbi->one_comp.obj.id = 0; | |
756 | exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj); | |
5bf696da BH |
757 | sbi->oc.single_comp = EC_SINGLE_COMP; |
758 | sbi->oc.comps = &sbi->one_comp; | |
9e9db456 | 759 | |
ba9e5e98 BH |
760 | /* fill in some other data by hand */ |
761 | memset(sb->s_id, 0, sizeof(sb->s_id)); | |
762 | strcpy(sb->s_id, "exofs"); | |
763 | sb->s_blocksize = EXOFS_BLKSIZE; | |
764 | sb->s_blocksize_bits = EXOFS_BLKSHIFT; | |
765 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
8de52778 | 766 | sb->s_max_links = EXOFS_LINK_MAX; |
ba9e5e98 BH |
767 | atomic_set(&sbi->s_curr_pending, 0); |
768 | sb->s_bdev = NULL; | |
769 | sb->s_dev = 0; | |
770 | ||
9e9db456 BH |
771 | comp.obj.partition = sbi->one_comp.obj.partition; |
772 | comp.obj.id = EXOFS_SUPER_ID; | |
773 | exofs_make_credential(comp.cred, &comp.obj); | |
ba9e5e98 | 774 | |
9e9db456 | 775 | ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb)); |
06886a5a | 776 | if (unlikely(ret)) |
ba9e5e98 | 777 | goto free_sbi; |
ba9e5e98 BH |
778 | |
779 | sb->s_magic = le16_to_cpu(fscb.s_magic); | |
1cea312a | 780 | /* NOTE: we read below to be backward compatible with old versions */ |
ba9e5e98 BH |
781 | sbi->s_nextid = le64_to_cpu(fscb.s_nextid); |
782 | sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles); | |
783 | ||
784 | /* make sure what we read from the object store is correct */ | |
785 | if (sb->s_magic != EXOFS_SUPER_MAGIC) { | |
786 | if (!silent) | |
787 | EXOFS_ERR("ERROR: Bad magic value\n"); | |
788 | ret = -EINVAL; | |
789 | goto free_sbi; | |
790 | } | |
1cea312a | 791 | if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) { |
04dc1e88 BH |
792 | EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n", |
793 | EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version)); | |
794 | ret = -EINVAL; | |
795 | goto free_sbi; | |
796 | } | |
ba9e5e98 BH |
797 | |
798 | /* start generation numbers from a random point */ | |
799 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
800 | spin_lock_init(&sbi->s_next_gen_lock); | |
801 | ||
04dc1e88 BH |
802 | table_count = le64_to_cpu(fscb.s_dev_table_count); |
803 | if (table_count) { | |
6d4073e8 | 804 | ret = exofs_read_lookup_dev_table(sbi, od, table_count); |
04dc1e88 BH |
805 | if (unlikely(ret)) |
806 | goto free_sbi; | |
6d4073e8 | 807 | } else { |
d866d875 BH |
808 | struct exofs_dev *eds; |
809 | ||
810 | ret = __alloc_dev_table(sbi, 1, &eds); | |
811 | if (unlikely(ret)) | |
812 | goto free_sbi; | |
813 | ||
814 | ore_comp_set_dev(&sbi->oc, 0, od); | |
6abe4a87 | 815 | sbi->oc.numdevs = 1; |
04dc1e88 BH |
816 | } |
817 | ||
1cea312a BH |
818 | __sbi_read_stats(sbi); |
819 | ||
ba9e5e98 | 820 | /* set up operation vectors */ |
66cd6cad | 821 | sbi->bdi.ra_pages = __ra_pages(&sbi->layout); |
b3d0ab7e | 822 | sb->s_bdi = &sbi->bdi; |
06886a5a | 823 | sb->s_fs_info = sbi; |
ba9e5e98 | 824 | sb->s_op = &exofs_sops; |
8cf74b39 | 825 | sb->s_export_op = &exofs_export_ops; |
ba9e5e98 BH |
826 | root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF); |
827 | if (IS_ERR(root)) { | |
828 | EXOFS_ERR("ERROR: exofs_iget failed\n"); | |
829 | ret = PTR_ERR(root); | |
830 | goto free_sbi; | |
831 | } | |
48fde701 | 832 | sb->s_root = d_make_root(root); |
ba9e5e98 | 833 | if (!sb->s_root) { |
ba9e5e98 BH |
834 | EXOFS_ERR("ERROR: get root inode failed\n"); |
835 | ret = -ENOMEM; | |
836 | goto free_sbi; | |
837 | } | |
838 | ||
839 | if (!S_ISDIR(root->i_mode)) { | |
840 | dput(sb->s_root); | |
841 | sb->s_root = NULL; | |
842 | EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n", | |
843 | root->i_mode); | |
844 | ret = -EINVAL; | |
845 | goto free_sbi; | |
846 | } | |
847 | ||
6d4073e8 BH |
848 | ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY); |
849 | if (ret) { | |
850 | EXOFS_DBGMSG("Failed to bdi_setup_and_register\n"); | |
da01636a AV |
851 | dput(sb->s_root); |
852 | sb->s_root = NULL; | |
6d4073e8 BH |
853 | goto free_sbi; |
854 | } | |
855 | ||
8b56a30c | 856 | exofs_sysfs_dbg_print(); |
d866d875 BH |
857 | _exofs_print_device("Mounting", opts->dev_name, |
858 | ore_comp_dev(&sbi->oc, 0), | |
9e9db456 | 859 | sbi->one_comp.obj.partition); |
06886a5a | 860 | return 0; |
ba9e5e98 BH |
861 | |
862 | free_sbi: | |
06886a5a | 863 | EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n", |
9e9db456 | 864 | opts->dev_name, sbi->one_comp.obj.partition, ret); |
04dc1e88 | 865 | exofs_free_sbi(sbi); |
06886a5a | 866 | return ret; |
ba9e5e98 BH |
867 | } |
868 | ||
869 | /* | |
870 | * Set up the superblock (calls exofs_fill_super eventually) | |
871 | */ | |
3c26ff6e | 872 | static struct dentry *exofs_mount(struct file_system_type *type, |
ba9e5e98 | 873 | int flags, const char *dev_name, |
3c26ff6e | 874 | void *data) |
ba9e5e98 BH |
875 | { |
876 | struct exofs_mountopt opts; | |
877 | int ret; | |
878 | ||
879 | ret = parse_options(data, &opts); | |
880 | if (ret) | |
3c26ff6e | 881 | return ERR_PTR(ret); |
ba9e5e98 | 882 | |
9ed96484 BH |
883 | if (!opts.dev_name) |
884 | opts.dev_name = dev_name; | |
3c26ff6e | 885 | return mount_nodev(type, flags, &opts, exofs_fill_super); |
ba9e5e98 BH |
886 | } |
887 | ||
888 | /* | |
889 | * Return information about the file system state in the buffer. This is used | |
890 | * by the 'df' command, for example. | |
891 | */ | |
892 | static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
893 | { | |
894 | struct super_block *sb = dentry->d_sb; | |
895 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
8ff660ab | 896 | struct ore_io_state *ios; |
ba9e5e98 BH |
897 | struct osd_attr attrs[] = { |
898 | ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS, | |
899 | OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)), | |
900 | ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION, | |
901 | OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)), | |
902 | }; | |
903 | uint64_t capacity = ULLONG_MAX; | |
904 | uint64_t used = ULLONG_MAX; | |
ba9e5e98 BH |
905 | int ret; |
906 | ||
5bf696da | 907 | ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); |
06886a5a | 908 | if (ret) { |
8ff660ab | 909 | EXOFS_DBGMSG("ore_get_io_state failed.\n"); |
06886a5a | 910 | return ret; |
ba9e5e98 BH |
911 | } |
912 | ||
06886a5a BH |
913 | ios->in_attr = attrs; |
914 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
915 | ||
8ff660ab | 916 | ret = ore_read(ios); |
ba9e5e98 BH |
917 | if (unlikely(ret)) |
918 | goto out; | |
919 | ||
06886a5a | 920 | ret = extract_attr_from_ios(ios, &attrs[0]); |
cae012d8 | 921 | if (likely(!ret)) { |
ba9e5e98 | 922 | capacity = get_unaligned_be64(attrs[0].val_ptr); |
cae012d8 BH |
923 | if (unlikely(!capacity)) |
924 | capacity = ULLONG_MAX; | |
925 | } else | |
ba9e5e98 BH |
926 | EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n"); |
927 | ||
06886a5a | 928 | ret = extract_attr_from_ios(ios, &attrs[1]); |
ba9e5e98 BH |
929 | if (likely(!ret)) |
930 | used = get_unaligned_be64(attrs[1].val_ptr); | |
931 | else | |
932 | EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n"); | |
933 | ||
934 | /* fill in the stats buffer */ | |
935 | buf->f_type = EXOFS_SUPER_MAGIC; | |
936 | buf->f_bsize = EXOFS_BLKSIZE; | |
cae012d8 BH |
937 | buf->f_blocks = capacity >> 9; |
938 | buf->f_bfree = (capacity - used) >> 9; | |
ba9e5e98 BH |
939 | buf->f_bavail = buf->f_bfree; |
940 | buf->f_files = sbi->s_numfiles; | |
941 | buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles; | |
942 | buf->f_namelen = EXOFS_NAME_LEN; | |
943 | ||
944 | out: | |
8ff660ab | 945 | ore_put_io_state(ios); |
ba9e5e98 BH |
946 | return ret; |
947 | } | |
948 | ||
949 | static const struct super_operations exofs_sops = { | |
950 | .alloc_inode = exofs_alloc_inode, | |
951 | .destroy_inode = exofs_destroy_inode, | |
952 | .write_inode = exofs_write_inode, | |
4ec70c9b | 953 | .evict_inode = exofs_evict_inode, |
ba9e5e98 BH |
954 | .put_super = exofs_put_super, |
955 | .write_super = exofs_write_super, | |
80e09fb9 | 956 | .sync_fs = exofs_sync_fs, |
ba9e5e98 BH |
957 | .statfs = exofs_statfs, |
958 | }; | |
959 | ||
8cf74b39 BH |
960 | /****************************************************************************** |
961 | * EXPORT OPERATIONS | |
962 | *****************************************************************************/ | |
963 | ||
de74b05a | 964 | static struct dentry *exofs_get_parent(struct dentry *child) |
8cf74b39 BH |
965 | { |
966 | unsigned long ino = exofs_parent_ino(child); | |
967 | ||
968 | if (!ino) | |
a803b806 | 969 | return ERR_PTR(-ESTALE); |
8cf74b39 BH |
970 | |
971 | return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino)); | |
972 | } | |
973 | ||
974 | static struct inode *exofs_nfs_get_inode(struct super_block *sb, | |
975 | u64 ino, u32 generation) | |
976 | { | |
977 | struct inode *inode; | |
978 | ||
979 | inode = exofs_iget(sb, ino); | |
980 | if (IS_ERR(inode)) | |
981 | return ERR_CAST(inode); | |
982 | if (generation && inode->i_generation != generation) { | |
983 | /* we didn't find the right inode.. */ | |
984 | iput(inode); | |
985 | return ERR_PTR(-ESTALE); | |
986 | } | |
987 | return inode; | |
988 | } | |
989 | ||
990 | static struct dentry *exofs_fh_to_dentry(struct super_block *sb, | |
991 | struct fid *fid, int fh_len, int fh_type) | |
992 | { | |
993 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
994 | exofs_nfs_get_inode); | |
995 | } | |
996 | ||
997 | static struct dentry *exofs_fh_to_parent(struct super_block *sb, | |
998 | struct fid *fid, int fh_len, int fh_type) | |
999 | { | |
1000 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
1001 | exofs_nfs_get_inode); | |
1002 | } | |
1003 | ||
1004 | static const struct export_operations exofs_export_ops = { | |
1005 | .fh_to_dentry = exofs_fh_to_dentry, | |
1006 | .fh_to_parent = exofs_fh_to_parent, | |
1007 | .get_parent = exofs_get_parent, | |
1008 | }; | |
1009 | ||
ba9e5e98 BH |
1010 | /****************************************************************************** |
1011 | * INSMOD/RMMOD | |
1012 | *****************************************************************************/ | |
1013 | ||
1014 | /* | |
1015 | * struct that describes this file system | |
1016 | */ | |
1017 | static struct file_system_type exofs_type = { | |
1018 | .owner = THIS_MODULE, | |
1019 | .name = "exofs", | |
3c26ff6e | 1020 | .mount = exofs_mount, |
ba9e5e98 BH |
1021 | .kill_sb = generic_shutdown_super, |
1022 | }; | |
1023 | ||
1024 | static int __init init_exofs(void) | |
1025 | { | |
1026 | int err; | |
1027 | ||
1028 | err = init_inodecache(); | |
1029 | if (err) | |
1030 | goto out; | |
1031 | ||
1032 | err = register_filesystem(&exofs_type); | |
1033 | if (err) | |
1034 | goto out_d; | |
1035 | ||
8b56a30c SB |
1036 | /* We don't fail if sysfs creation failed */ |
1037 | exofs_sysfs_init(); | |
1038 | ||
ba9e5e98 BH |
1039 | return 0; |
1040 | out_d: | |
1041 | destroy_inodecache(); | |
1042 | out: | |
1043 | return err; | |
1044 | } | |
1045 | ||
1046 | static void __exit exit_exofs(void) | |
1047 | { | |
8b56a30c | 1048 | exofs_sysfs_uninit(); |
ba9e5e98 BH |
1049 | unregister_filesystem(&exofs_type); |
1050 | destroy_inodecache(); | |
1051 | } | |
1052 | ||
1053 | MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>"); | |
1054 | MODULE_DESCRIPTION("exofs"); | |
1055 | MODULE_LICENSE("GPL"); | |
1056 | ||
1057 | module_init(init_exofs) | |
1058 | module_exit(exit_exofs) |