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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> | |
8cf74b39 | 38 | #include <linux/exportfs.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
ba9e5e98 BH |
40 | |
41 | #include "exofs.h" | |
42 | ||
85e44df4 BH |
43 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
44 | ||
ba9e5e98 BH |
45 | /****************************************************************************** |
46 | * MOUNT OPTIONS | |
47 | *****************************************************************************/ | |
48 | ||
49 | /* | |
50 | * struct to hold what we get from mount options | |
51 | */ | |
52 | struct exofs_mountopt { | |
9ed96484 | 53 | bool is_osdname; |
ba9e5e98 BH |
54 | const char *dev_name; |
55 | uint64_t pid; | |
56 | int timeout; | |
57 | }; | |
58 | ||
59 | /* | |
60 | * exofs-specific mount-time options. | |
61 | */ | |
9ed96484 | 62 | enum { Opt_name, Opt_pid, Opt_to, Opt_err }; |
ba9e5e98 BH |
63 | |
64 | /* | |
65 | * Our mount-time options. These should ideally be 64-bit unsigned, but the | |
66 | * kernel's parsing functions do not currently support that. 32-bit should be | |
67 | * sufficient for most applications now. | |
68 | */ | |
69 | static match_table_t tokens = { | |
9ed96484 | 70 | {Opt_name, "osdname=%s"}, |
ba9e5e98 BH |
71 | {Opt_pid, "pid=%u"}, |
72 | {Opt_to, "to=%u"}, | |
73 | {Opt_err, NULL} | |
74 | }; | |
75 | ||
76 | /* | |
77 | * The main option parsing method. Also makes sure that all of the mandatory | |
78 | * mount options were set. | |
79 | */ | |
80 | static int parse_options(char *options, struct exofs_mountopt *opts) | |
81 | { | |
82 | char *p; | |
83 | substring_t args[MAX_OPT_ARGS]; | |
84 | int option; | |
85 | bool s_pid = false; | |
86 | ||
87 | EXOFS_DBGMSG("parse_options %s\n", options); | |
88 | /* defaults */ | |
89 | memset(opts, 0, sizeof(*opts)); | |
90 | opts->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
91 | ||
92 | while ((p = strsep(&options, ",")) != NULL) { | |
93 | int token; | |
94 | char str[32]; | |
95 | ||
96 | if (!*p) | |
97 | continue; | |
98 | ||
99 | token = match_token(p, tokens, args); | |
100 | switch (token) { | |
9ed96484 BH |
101 | case Opt_name: |
102 | opts->dev_name = match_strdup(&args[0]); | |
103 | if (unlikely(!opts->dev_name)) { | |
104 | EXOFS_ERR("Error allocating dev_name"); | |
105 | return -ENOMEM; | |
106 | } | |
107 | opts->is_osdname = true; | |
108 | break; | |
ba9e5e98 BH |
109 | case Opt_pid: |
110 | if (0 == match_strlcpy(str, &args[0], sizeof(str))) | |
111 | return -EINVAL; | |
112 | opts->pid = simple_strtoull(str, NULL, 0); | |
113 | if (opts->pid < EXOFS_MIN_PID) { | |
114 | EXOFS_ERR("Partition ID must be >= %u", | |
115 | EXOFS_MIN_PID); | |
116 | return -EINVAL; | |
117 | } | |
118 | s_pid = 1; | |
119 | break; | |
120 | case Opt_to: | |
121 | if (match_int(&args[0], &option)) | |
122 | return -EINVAL; | |
123 | if (option <= 0) { | |
124 | EXOFS_ERR("Timout must be > 0"); | |
125 | return -EINVAL; | |
126 | } | |
127 | opts->timeout = option * HZ; | |
128 | break; | |
129 | } | |
130 | } | |
131 | ||
132 | if (!s_pid) { | |
133 | EXOFS_ERR("Need to specify the following options:\n"); | |
134 | EXOFS_ERR(" -o pid=pid_no_to_use\n"); | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | /****************************************************************************** | |
142 | * INODE CACHE | |
143 | *****************************************************************************/ | |
144 | ||
145 | /* | |
146 | * Our inode cache. Isn't it pretty? | |
147 | */ | |
148 | static struct kmem_cache *exofs_inode_cachep; | |
149 | ||
150 | /* | |
151 | * Allocate an inode in the cache | |
152 | */ | |
153 | static struct inode *exofs_alloc_inode(struct super_block *sb) | |
154 | { | |
155 | struct exofs_i_info *oi; | |
156 | ||
157 | oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL); | |
158 | if (!oi) | |
159 | return NULL; | |
160 | ||
161 | oi->vfs_inode.i_version = 1; | |
162 | return &oi->vfs_inode; | |
163 | } | |
164 | ||
fa0d7e3d NP |
165 | static void exofs_i_callback(struct rcu_head *head) |
166 | { | |
167 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
168 | INIT_LIST_HEAD(&inode->i_dentry); | |
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 | ||
8ff660ab | 269 | ret = ore_get_io_state(&sbi->layout, &sbi->comps, &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 | ||
8ff660ab | 324 | ret = ore_get_io_state(&sbi->layout, &sbi->comps, &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 | */ | |
baaf94cd | 358 | 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 BH |
362 | struct ore_comp one_comp; |
363 | struct ore_components comps; | |
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 BH |
380 | |
381 | exofs_init_comps(&comps, &one_comp, sbi, EXOFS_SUPER_ID); | |
382 | ||
8ff660ab | 383 | ret = ore_get_io_state(&sbi->layout, &comps, &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 BH |
391 | fscb->s_nextid = cpu_to_le64(sbi->s_nextid); |
392 | fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles); | |
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 | ||
04dc1e88 BH |
432 | void exofs_free_sbi(struct exofs_sb_info *sbi) |
433 | { | |
9e9db456 BH |
434 | while (sbi->comps.numdevs) { |
435 | int i = --sbi->comps.numdevs; | |
436 | struct osd_dev *od = sbi->comps.ods[i]; | |
04dc1e88 BH |
437 | |
438 | if (od) { | |
9e9db456 | 439 | sbi->comps.ods[i] = NULL; |
04dc1e88 BH |
440 | osduld_put_device(od); |
441 | } | |
442 | } | |
9e9db456 BH |
443 | if (sbi->comps.ods != sbi->_min_one_dev) |
444 | kfree(sbi->comps.ods); | |
04dc1e88 BH |
445 | kfree(sbi); |
446 | } | |
447 | ||
ba9e5e98 BH |
448 | /* |
449 | * This function is called when the vfs is freeing the superblock. We just | |
450 | * need to free our own part. | |
451 | */ | |
452 | static void exofs_put_super(struct super_block *sb) | |
453 | { | |
454 | int num_pend; | |
455 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
456 | ||
457 | /* make sure there are no pending commands */ | |
458 | for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0; | |
459 | num_pend = atomic_read(&sbi->s_curr_pending)) { | |
460 | wait_queue_head_t wq; | |
a49fb4c3 BH |
461 | |
462 | printk(KERN_NOTICE "%s: !!Pending operations in flight. " | |
463 | "This is a BUG. please report to osd-dev@open-osd.org\n", | |
464 | __func__); | |
ba9e5e98 BH |
465 | init_waitqueue_head(&wq); |
466 | wait_event_timeout(wq, | |
467 | (atomic_read(&sbi->s_curr_pending) == 0), | |
468 | msecs_to_jiffies(100)); | |
469 | } | |
470 | ||
9e9db456 BH |
471 | _exofs_print_device("Unmounting", NULL, sbi->comps.ods[0], |
472 | sbi->one_comp.obj.partition); | |
04dc1e88 | 473 | |
b3d0ab7e | 474 | bdi_destroy(&sbi->bdi); |
04dc1e88 | 475 | exofs_free_sbi(sbi); |
ba9e5e98 BH |
476 | sb->s_fs_info = NULL; |
477 | } | |
478 | ||
04dc1e88 BH |
479 | static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, |
480 | struct exofs_device_table *dt) | |
481 | { | |
5d952b83 BH |
482 | u64 stripe_length; |
483 | ||
04dc1e88 BH |
484 | sbi->data_map.odm_num_comps = |
485 | le32_to_cpu(dt->dt_data_map.cb_num_comps); | |
486 | sbi->data_map.odm_stripe_unit = | |
487 | le64_to_cpu(dt->dt_data_map.cb_stripe_unit); | |
488 | sbi->data_map.odm_group_width = | |
489 | le32_to_cpu(dt->dt_data_map.cb_group_width); | |
490 | sbi->data_map.odm_group_depth = | |
491 | le32_to_cpu(dt->dt_data_map.cb_group_depth); | |
492 | sbi->data_map.odm_mirror_cnt = | |
493 | le32_to_cpu(dt->dt_data_map.cb_mirror_cnt); | |
494 | sbi->data_map.odm_raid_algorithm = | |
495 | le32_to_cpu(dt->dt_data_map.cb_raid_algorithm); | |
496 | ||
50a76fd3 | 497 | /* FIXME: Only raid0 for now. if not so, do not mount */ |
5d952b83 BH |
498 | if (sbi->data_map.odm_num_comps != numdevs) { |
499 | EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n", | |
500 | sbi->data_map.odm_num_comps, numdevs); | |
501 | return -EINVAL; | |
502 | } | |
503 | if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) { | |
504 | EXOFS_ERR("Only RAID_0 for now\n"); | |
505 | return -EINVAL; | |
506 | } | |
507 | if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) { | |
508 | EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n", | |
509 | numdevs, sbi->data_map.odm_mirror_cnt); | |
510 | return -EINVAL; | |
511 | } | |
512 | ||
5d952b83 BH |
513 | if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) { |
514 | EXOFS_ERR("Stripe Unit(0x%llx)" | |
515 | " must be Multples of PAGE_SIZE(0x%lx)\n", | |
516 | _LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE); | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
520 | sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit; | |
521 | sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1; | |
50a76fd3 BH |
522 | |
523 | if (sbi->data_map.odm_group_width) { | |
524 | sbi->layout.group_width = sbi->data_map.odm_group_width; | |
525 | sbi->layout.group_depth = sbi->data_map.odm_group_depth; | |
526 | if (!sbi->layout.group_depth) { | |
527 | EXOFS_ERR("group_depth == 0 && group_width != 0\n"); | |
528 | return -EINVAL; | |
529 | } | |
530 | sbi->layout.group_count = sbi->data_map.odm_num_comps / | |
531 | sbi->layout.mirrors_p1 / | |
532 | sbi->data_map.odm_group_width; | |
533 | } else { | |
534 | if (sbi->data_map.odm_group_depth) { | |
535 | printk(KERN_NOTICE "Warning: group_depth ignored " | |
536 | "group_width == 0 && group_depth == %d\n", | |
537 | sbi->data_map.odm_group_depth); | |
538 | sbi->data_map.odm_group_depth = 0; | |
539 | } | |
540 | sbi->layout.group_width = sbi->data_map.odm_num_comps / | |
5d952b83 | 541 | sbi->layout.mirrors_p1; |
50a76fd3 BH |
542 | sbi->layout.group_depth = -1; |
543 | sbi->layout.group_count = 1; | |
544 | } | |
545 | ||
546 | stripe_length = (u64)sbi->layout.group_width * sbi->layout.stripe_unit; | |
547 | if (stripe_length >= (1ULL << 32)) { | |
548 | EXOFS_ERR("Total Stripe length(0x%llx)" | |
549 | " >= 32bit is not supported\n", _LLU(stripe_length)); | |
550 | return -EINVAL; | |
551 | } | |
5d952b83 | 552 | |
6d4073e8 BH |
553 | EXOFS_DBGMSG("exofs: layout: " |
554 | "num_comps=%u stripe_unit=0x%x group_width=%u " | |
555 | "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n", | |
556 | numdevs, | |
557 | sbi->layout.stripe_unit, | |
558 | sbi->layout.group_width, | |
559 | _LLU(sbi->layout.group_depth), | |
560 | sbi->layout.mirrors_p1, | |
561 | sbi->data_map.odm_raid_algorithm); | |
5d952b83 | 562 | return 0; |
04dc1e88 BH |
563 | } |
564 | ||
8ff660ab | 565 | static unsigned __ra_pages(struct ore_layout *layout) |
66cd6cad | 566 | { |
567 | const unsigned _MIN_RA = 32; /* min 128K read-ahead */ | |
568 | unsigned ra_pages = layout->group_width * layout->stripe_unit / | |
569 | PAGE_SIZE; | |
570 | unsigned max_io_pages = exofs_max_io_pages(layout, ~0); | |
571 | ||
572 | ra_pages *= 2; /* two stripes */ | |
573 | if (ra_pages < _MIN_RA) | |
574 | ra_pages = roundup(_MIN_RA, ra_pages / 2); | |
575 | ||
576 | if (ra_pages > max_io_pages) | |
577 | ra_pages = max_io_pages; | |
578 | ||
579 | return ra_pages; | |
580 | } | |
581 | ||
04dc1e88 BH |
582 | /* @odi is valid only as long as @fscb_dev is valid */ |
583 | static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev, | |
584 | struct osd_dev_info *odi) | |
585 | { | |
586 | odi->systemid_len = le32_to_cpu(dt_dev->systemid_len); | |
587 | memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len); | |
588 | ||
589 | odi->osdname_len = le32_to_cpu(dt_dev->osdname_len); | |
590 | odi->osdname = dt_dev->osdname; | |
591 | ||
592 | /* FIXME support long names. Will need a _put function */ | |
593 | if (dt_dev->long_name_offset) | |
594 | return -EINVAL; | |
595 | ||
596 | /* Make sure osdname is printable! | |
597 | * mkexofs should give us space for a null-terminator else the | |
598 | * device-table is invalid. | |
599 | */ | |
600 | if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname))) | |
601 | odi->osdname_len = sizeof(dt_dev->osdname) - 1; | |
602 | dt_dev->osdname[odi->osdname_len] = 0; | |
603 | ||
604 | /* If it's all zeros something is bad we read past end-of-obj */ | |
605 | return !(odi->systemid_len || odi->osdname_len); | |
606 | } | |
607 | ||
6d4073e8 BH |
608 | static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi, |
609 | struct osd_dev *fscb_od, | |
04dc1e88 BH |
610 | unsigned table_count) |
611 | { | |
8ff660ab | 612 | struct ore_comp comp; |
04dc1e88 BH |
613 | struct exofs_device_table *dt; |
614 | unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) + | |
615 | sizeof(*dt); | |
616 | unsigned numdevs, i; | |
617 | int ret; | |
618 | ||
619 | dt = kmalloc(table_bytes, GFP_KERNEL); | |
620 | if (unlikely(!dt)) { | |
621 | EXOFS_ERR("ERROR: allocating %x bytes for device table\n", | |
622 | table_bytes); | |
623 | return -ENOMEM; | |
624 | } | |
625 | ||
9e9db456 BH |
626 | sbi->comps.numdevs = 0; |
627 | ||
628 | comp.obj.partition = sbi->one_comp.obj.partition; | |
629 | comp.obj.id = EXOFS_DEVTABLE_ID; | |
630 | exofs_make_credential(comp.cred, &comp.obj); | |
631 | ||
632 | ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt, | |
633 | table_bytes); | |
04dc1e88 BH |
634 | if (unlikely(ret)) { |
635 | EXOFS_ERR("ERROR: reading device table\n"); | |
636 | goto out; | |
637 | } | |
638 | ||
639 | numdevs = le64_to_cpu(dt->dt_num_devices); | |
640 | if (unlikely(!numdevs)) { | |
641 | ret = -EINVAL; | |
642 | goto out; | |
643 | } | |
644 | WARN_ON(table_count != numdevs); | |
645 | ||
646 | ret = _read_and_match_data_map(sbi, numdevs, dt); | |
647 | if (unlikely(ret)) | |
648 | goto out; | |
649 | ||
650 | if (likely(numdevs > 1)) { | |
9e9db456 | 651 | unsigned size = numdevs * sizeof(sbi->comps.ods[0]); |
04dc1e88 | 652 | |
9e9db456 BH |
653 | /* Twice bigger table: See exofs_init_comps() and below |
654 | * comment | |
655 | */ | |
656 | sbi->comps.ods = kzalloc(size + size - 1, GFP_KERNEL); | |
657 | if (unlikely(!sbi->comps.ods)) { | |
6d4073e8 BH |
658 | EXOFS_ERR("ERROR: faild allocating Device array[%d]\n", |
659 | numdevs); | |
04dc1e88 BH |
660 | ret = -ENOMEM; |
661 | goto out; | |
662 | } | |
04dc1e88 BH |
663 | } |
664 | ||
665 | for (i = 0; i < numdevs; i++) { | |
666 | struct exofs_fscb fscb; | |
667 | struct osd_dev_info odi; | |
668 | struct osd_dev *od; | |
669 | ||
670 | if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) { | |
671 | EXOFS_ERR("ERROR: Read all-zeros device entry\n"); | |
672 | ret = -EINVAL; | |
673 | goto out; | |
674 | } | |
675 | ||
676 | printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n", | |
677 | i, odi.osdname); | |
678 | ||
679 | /* On all devices the device table is identical. The user can | |
680 | * specify any one of the participating devices on the command | |
681 | * line. We always keep them in device-table order. | |
682 | */ | |
683 | if (fscb_od && osduld_device_same(fscb_od, &odi)) { | |
9e9db456 BH |
684 | sbi->comps.ods[i] = fscb_od; |
685 | ++sbi->comps.numdevs; | |
04dc1e88 BH |
686 | fscb_od = NULL; |
687 | continue; | |
688 | } | |
689 | ||
690 | od = osduld_info_lookup(&odi); | |
2c722c9a | 691 | if (IS_ERR(od)) { |
04dc1e88 BH |
692 | ret = PTR_ERR(od); |
693 | EXOFS_ERR("ERROR: device requested is not found " | |
694 | "osd_name-%s =>%d\n", odi.osdname, ret); | |
695 | goto out; | |
696 | } | |
697 | ||
9e9db456 BH |
698 | sbi->comps.ods[i] = od; |
699 | ++sbi->comps.numdevs; | |
04dc1e88 BH |
700 | |
701 | /* Read the fscb of the other devices to make sure the FS | |
702 | * partition is there. | |
703 | */ | |
9e9db456 | 704 | ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, |
04dc1e88 BH |
705 | sizeof(fscb)); |
706 | if (unlikely(ret)) { | |
707 | EXOFS_ERR("ERROR: Malformed participating device " | |
708 | "error reading fscb osd_name-%s\n", | |
709 | odi.osdname); | |
710 | goto out; | |
711 | } | |
712 | ||
713 | /* TODO: verify other information is correct and FS-uuid | |
714 | * matches. Benny what did you say about device table | |
715 | * generation and old devices? | |
716 | */ | |
717 | } | |
718 | ||
719 | out: | |
720 | kfree(dt); | |
9e9db456 BH |
721 | if (likely(!ret)) { |
722 | unsigned numdevs = sbi->comps.numdevs; | |
04dc1e88 | 723 | |
9e9db456 BH |
724 | if (unlikely(fscb_od)) { |
725 | EXOFS_ERR("ERROR: Bad device-table container device not present\n"); | |
726 | osduld_put_device(fscb_od); | |
727 | return -EINVAL; | |
728 | } | |
729 | /* exofs round-robins the device table view according to inode | |
730 | * number. We hold a: twice bigger table hence inodes can point | |
731 | * to any device and have a sequential view of the table | |
732 | * starting at this device. See exofs_init_comps() | |
733 | */ | |
734 | for (i = 0; i < numdevs - 1; ++i) | |
735 | sbi->comps.ods[i + numdevs] = sbi->comps.ods[i]; | |
736 | } | |
04dc1e88 BH |
737 | return ret; |
738 | } | |
739 | ||
ba9e5e98 BH |
740 | /* |
741 | * Read the superblock from the OSD and fill in the fields | |
742 | */ | |
743 | static int exofs_fill_super(struct super_block *sb, void *data, int silent) | |
744 | { | |
745 | struct inode *root; | |
746 | struct exofs_mountopt *opts = data; | |
747 | struct exofs_sb_info *sbi; /*extended info */ | |
06886a5a | 748 | struct osd_dev *od; /* Master device */ |
ba9e5e98 | 749 | struct exofs_fscb fscb; /*on-disk superblock info */ |
8ff660ab | 750 | struct ore_comp comp; |
04dc1e88 | 751 | unsigned table_count; |
ba9e5e98 BH |
752 | int ret; |
753 | ||
754 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
755 | if (!sbi) | |
756 | return -ENOMEM; | |
ba9e5e98 BH |
757 | |
758 | /* use mount options to fill superblock */ | |
9ed96484 BH |
759 | if (opts->is_osdname) { |
760 | struct osd_dev_info odi = {.systemid_len = 0}; | |
761 | ||
762 | odi.osdname_len = strlen(opts->dev_name); | |
763 | odi.osdname = (u8 *)opts->dev_name; | |
764 | od = osduld_info_lookup(&odi); | |
9ce73047 BH |
765 | kfree(opts->dev_name); |
766 | opts->dev_name = NULL; | |
9ed96484 BH |
767 | } else { |
768 | od = osduld_path_lookup(opts->dev_name); | |
769 | } | |
06886a5a | 770 | if (IS_ERR(od)) { |
9ed96484 | 771 | ret = -EINVAL; |
ba9e5e98 BH |
772 | goto free_sbi; |
773 | } | |
774 | ||
45d3abcb | 775 | /* Default layout in case we do not have a device-table */ |
5d952b83 BH |
776 | sbi->layout.stripe_unit = PAGE_SIZE; |
777 | sbi->layout.mirrors_p1 = 1; | |
778 | sbi->layout.group_width = 1; | |
50a76fd3 BH |
779 | sbi->layout.group_depth = -1; |
780 | sbi->layout.group_count = 1; | |
ba9e5e98 BH |
781 | sbi->s_timeout = opts->timeout; |
782 | ||
9e9db456 BH |
783 | sbi->one_comp.obj.partition = opts->pid; |
784 | sbi->one_comp.obj.id = 0; | |
785 | exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj); | |
786 | sbi->comps.numdevs = 1; | |
787 | sbi->comps.single_comp = EC_SINGLE_COMP; | |
788 | sbi->comps.comps = &sbi->one_comp; | |
789 | sbi->comps.ods = sbi->_min_one_dev; | |
790 | ||
ba9e5e98 BH |
791 | /* fill in some other data by hand */ |
792 | memset(sb->s_id, 0, sizeof(sb->s_id)); | |
793 | strcpy(sb->s_id, "exofs"); | |
794 | sb->s_blocksize = EXOFS_BLKSIZE; | |
795 | sb->s_blocksize_bits = EXOFS_BLKSHIFT; | |
796 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
797 | atomic_set(&sbi->s_curr_pending, 0); | |
798 | sb->s_bdev = NULL; | |
799 | sb->s_dev = 0; | |
800 | ||
9e9db456 BH |
801 | comp.obj.partition = sbi->one_comp.obj.partition; |
802 | comp.obj.id = EXOFS_SUPER_ID; | |
803 | exofs_make_credential(comp.cred, &comp.obj); | |
ba9e5e98 | 804 | |
9e9db456 | 805 | ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb)); |
06886a5a | 806 | if (unlikely(ret)) |
ba9e5e98 | 807 | goto free_sbi; |
ba9e5e98 BH |
808 | |
809 | sb->s_magic = le16_to_cpu(fscb.s_magic); | |
1cea312a | 810 | /* NOTE: we read below to be backward compatible with old versions */ |
ba9e5e98 BH |
811 | sbi->s_nextid = le64_to_cpu(fscb.s_nextid); |
812 | sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles); | |
813 | ||
814 | /* make sure what we read from the object store is correct */ | |
815 | if (sb->s_magic != EXOFS_SUPER_MAGIC) { | |
816 | if (!silent) | |
817 | EXOFS_ERR("ERROR: Bad magic value\n"); | |
818 | ret = -EINVAL; | |
819 | goto free_sbi; | |
820 | } | |
1cea312a | 821 | if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) { |
04dc1e88 BH |
822 | EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n", |
823 | EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version)); | |
824 | ret = -EINVAL; | |
825 | goto free_sbi; | |
826 | } | |
ba9e5e98 BH |
827 | |
828 | /* start generation numbers from a random point */ | |
829 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
830 | spin_lock_init(&sbi->s_next_gen_lock); | |
831 | ||
04dc1e88 BH |
832 | table_count = le64_to_cpu(fscb.s_dev_table_count); |
833 | if (table_count) { | |
6d4073e8 | 834 | ret = exofs_read_lookup_dev_table(sbi, od, table_count); |
04dc1e88 BH |
835 | if (unlikely(ret)) |
836 | goto free_sbi; | |
6d4073e8 | 837 | } else { |
9e9db456 | 838 | sbi->comps.ods[0] = od; |
04dc1e88 BH |
839 | } |
840 | ||
1cea312a BH |
841 | __sbi_read_stats(sbi); |
842 | ||
ba9e5e98 | 843 | /* set up operation vectors */ |
66cd6cad | 844 | sbi->bdi.ra_pages = __ra_pages(&sbi->layout); |
b3d0ab7e | 845 | sb->s_bdi = &sbi->bdi; |
06886a5a | 846 | sb->s_fs_info = sbi; |
ba9e5e98 | 847 | sb->s_op = &exofs_sops; |
8cf74b39 | 848 | sb->s_export_op = &exofs_export_ops; |
ba9e5e98 BH |
849 | root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF); |
850 | if (IS_ERR(root)) { | |
851 | EXOFS_ERR("ERROR: exofs_iget failed\n"); | |
852 | ret = PTR_ERR(root); | |
853 | goto free_sbi; | |
854 | } | |
855 | sb->s_root = d_alloc_root(root); | |
856 | if (!sb->s_root) { | |
857 | iput(root); | |
858 | EXOFS_ERR("ERROR: get root inode failed\n"); | |
859 | ret = -ENOMEM; | |
860 | goto free_sbi; | |
861 | } | |
862 | ||
863 | if (!S_ISDIR(root->i_mode)) { | |
864 | dput(sb->s_root); | |
865 | sb->s_root = NULL; | |
866 | EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n", | |
867 | root->i_mode); | |
868 | ret = -EINVAL; | |
869 | goto free_sbi; | |
870 | } | |
871 | ||
6d4073e8 BH |
872 | ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY); |
873 | if (ret) { | |
874 | EXOFS_DBGMSG("Failed to bdi_setup_and_register\n"); | |
875 | goto free_sbi; | |
876 | } | |
877 | ||
9e9db456 BH |
878 | _exofs_print_device("Mounting", opts->dev_name, sbi->comps.ods[0], |
879 | sbi->one_comp.obj.partition); | |
06886a5a | 880 | return 0; |
ba9e5e98 BH |
881 | |
882 | free_sbi: | |
06886a5a | 883 | EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n", |
9e9db456 | 884 | opts->dev_name, sbi->one_comp.obj.partition, ret); |
04dc1e88 | 885 | exofs_free_sbi(sbi); |
06886a5a | 886 | return ret; |
ba9e5e98 BH |
887 | } |
888 | ||
889 | /* | |
890 | * Set up the superblock (calls exofs_fill_super eventually) | |
891 | */ | |
3c26ff6e | 892 | static struct dentry *exofs_mount(struct file_system_type *type, |
ba9e5e98 | 893 | int flags, const char *dev_name, |
3c26ff6e | 894 | void *data) |
ba9e5e98 BH |
895 | { |
896 | struct exofs_mountopt opts; | |
897 | int ret; | |
898 | ||
899 | ret = parse_options(data, &opts); | |
900 | if (ret) | |
3c26ff6e | 901 | return ERR_PTR(ret); |
ba9e5e98 | 902 | |
9ed96484 BH |
903 | if (!opts.dev_name) |
904 | opts.dev_name = dev_name; | |
3c26ff6e | 905 | return mount_nodev(type, flags, &opts, exofs_fill_super); |
ba9e5e98 BH |
906 | } |
907 | ||
908 | /* | |
909 | * Return information about the file system state in the buffer. This is used | |
910 | * by the 'df' command, for example. | |
911 | */ | |
912 | static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
913 | { | |
914 | struct super_block *sb = dentry->d_sb; | |
915 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
8ff660ab | 916 | struct ore_io_state *ios; |
ba9e5e98 BH |
917 | struct osd_attr attrs[] = { |
918 | ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS, | |
919 | OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)), | |
920 | ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION, | |
921 | OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)), | |
922 | }; | |
923 | uint64_t capacity = ULLONG_MAX; | |
924 | uint64_t used = ULLONG_MAX; | |
ba9e5e98 BH |
925 | int ret; |
926 | ||
8ff660ab | 927 | ret = ore_get_io_state(&sbi->layout, &sbi->comps, &ios); |
06886a5a | 928 | if (ret) { |
8ff660ab | 929 | EXOFS_DBGMSG("ore_get_io_state failed.\n"); |
06886a5a | 930 | return ret; |
ba9e5e98 BH |
931 | } |
932 | ||
06886a5a BH |
933 | ios->in_attr = attrs; |
934 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
935 | ||
8ff660ab | 936 | ret = ore_read(ios); |
ba9e5e98 BH |
937 | if (unlikely(ret)) |
938 | goto out; | |
939 | ||
06886a5a | 940 | ret = extract_attr_from_ios(ios, &attrs[0]); |
cae012d8 | 941 | if (likely(!ret)) { |
ba9e5e98 | 942 | capacity = get_unaligned_be64(attrs[0].val_ptr); |
cae012d8 BH |
943 | if (unlikely(!capacity)) |
944 | capacity = ULLONG_MAX; | |
945 | } else | |
ba9e5e98 BH |
946 | EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n"); |
947 | ||
06886a5a | 948 | ret = extract_attr_from_ios(ios, &attrs[1]); |
ba9e5e98 BH |
949 | if (likely(!ret)) |
950 | used = get_unaligned_be64(attrs[1].val_ptr); | |
951 | else | |
952 | EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n"); | |
953 | ||
954 | /* fill in the stats buffer */ | |
955 | buf->f_type = EXOFS_SUPER_MAGIC; | |
956 | buf->f_bsize = EXOFS_BLKSIZE; | |
cae012d8 BH |
957 | buf->f_blocks = capacity >> 9; |
958 | buf->f_bfree = (capacity - used) >> 9; | |
ba9e5e98 BH |
959 | buf->f_bavail = buf->f_bfree; |
960 | buf->f_files = sbi->s_numfiles; | |
961 | buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles; | |
962 | buf->f_namelen = EXOFS_NAME_LEN; | |
963 | ||
964 | out: | |
8ff660ab | 965 | ore_put_io_state(ios); |
ba9e5e98 BH |
966 | return ret; |
967 | } | |
968 | ||
969 | static const struct super_operations exofs_sops = { | |
970 | .alloc_inode = exofs_alloc_inode, | |
971 | .destroy_inode = exofs_destroy_inode, | |
972 | .write_inode = exofs_write_inode, | |
4ec70c9b | 973 | .evict_inode = exofs_evict_inode, |
ba9e5e98 BH |
974 | .put_super = exofs_put_super, |
975 | .write_super = exofs_write_super, | |
80e09fb9 | 976 | .sync_fs = exofs_sync_fs, |
ba9e5e98 BH |
977 | .statfs = exofs_statfs, |
978 | }; | |
979 | ||
8cf74b39 BH |
980 | /****************************************************************************** |
981 | * EXPORT OPERATIONS | |
982 | *****************************************************************************/ | |
983 | ||
984 | struct dentry *exofs_get_parent(struct dentry *child) | |
985 | { | |
986 | unsigned long ino = exofs_parent_ino(child); | |
987 | ||
988 | if (!ino) | |
a803b806 | 989 | return ERR_PTR(-ESTALE); |
8cf74b39 BH |
990 | |
991 | return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino)); | |
992 | } | |
993 | ||
994 | static struct inode *exofs_nfs_get_inode(struct super_block *sb, | |
995 | u64 ino, u32 generation) | |
996 | { | |
997 | struct inode *inode; | |
998 | ||
999 | inode = exofs_iget(sb, ino); | |
1000 | if (IS_ERR(inode)) | |
1001 | return ERR_CAST(inode); | |
1002 | if (generation && inode->i_generation != generation) { | |
1003 | /* we didn't find the right inode.. */ | |
1004 | iput(inode); | |
1005 | return ERR_PTR(-ESTALE); | |
1006 | } | |
1007 | return inode; | |
1008 | } | |
1009 | ||
1010 | static struct dentry *exofs_fh_to_dentry(struct super_block *sb, | |
1011 | struct fid *fid, int fh_len, int fh_type) | |
1012 | { | |
1013 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
1014 | exofs_nfs_get_inode); | |
1015 | } | |
1016 | ||
1017 | static struct dentry *exofs_fh_to_parent(struct super_block *sb, | |
1018 | struct fid *fid, int fh_len, int fh_type) | |
1019 | { | |
1020 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
1021 | exofs_nfs_get_inode); | |
1022 | } | |
1023 | ||
1024 | static const struct export_operations exofs_export_ops = { | |
1025 | .fh_to_dentry = exofs_fh_to_dentry, | |
1026 | .fh_to_parent = exofs_fh_to_parent, | |
1027 | .get_parent = exofs_get_parent, | |
1028 | }; | |
1029 | ||
ba9e5e98 BH |
1030 | /****************************************************************************** |
1031 | * INSMOD/RMMOD | |
1032 | *****************************************************************************/ | |
1033 | ||
1034 | /* | |
1035 | * struct that describes this file system | |
1036 | */ | |
1037 | static struct file_system_type exofs_type = { | |
1038 | .owner = THIS_MODULE, | |
1039 | .name = "exofs", | |
3c26ff6e | 1040 | .mount = exofs_mount, |
ba9e5e98 BH |
1041 | .kill_sb = generic_shutdown_super, |
1042 | }; | |
1043 | ||
1044 | static int __init init_exofs(void) | |
1045 | { | |
1046 | int err; | |
1047 | ||
1048 | err = init_inodecache(); | |
1049 | if (err) | |
1050 | goto out; | |
1051 | ||
1052 | err = register_filesystem(&exofs_type); | |
1053 | if (err) | |
1054 | goto out_d; | |
1055 | ||
1056 | return 0; | |
1057 | out_d: | |
1058 | destroy_inodecache(); | |
1059 | out: | |
1060 | return err; | |
1061 | } | |
1062 | ||
1063 | static void __exit exit_exofs(void) | |
1064 | { | |
1065 | unregister_filesystem(&exofs_type); | |
1066 | destroy_inodecache(); | |
1067 | } | |
1068 | ||
1069 | MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>"); | |
1070 | MODULE_DESCRIPTION("exofs"); | |
1071 | MODULE_LICENSE("GPL"); | |
1072 | ||
1073 | module_init(init_exofs) | |
1074 | module_exit(exit_exofs) |