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