?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
PCI: Disable MPS configuration by default
[linux-btrfs-devel.git] / fs / exofs / super.c
blob274894053b025b69e9908012b11fc6d10ab32306
1 /*
2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
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>
38 #include <linux/exportfs.h>
39 #include <linux/slab.h>
40
41 #include "exofs.h"
42
43 #define EXOFS_DBGMSG2(M...) do {} while (0)
44
45 /******************************************************************************
46 * MOUNT OPTIONS
47 *****************************************************************************/
48
49 /*
50 * struct to hold what we get from mount options
51 */
52 struct exofs_mountopt {
53 bool is_osdname;
54 const char *dev_name;
55 uint64_t pid;
56 int timeout;
57 };
58
59 /*
60 * exofs-specific mount-time options.
61 */
62 enum { Opt_name, Opt_pid, Opt_to, Opt_err };
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 = {
70 {Opt_name, "osdname=%s"},
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) {
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;
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
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
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 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 /******************************************************************************
213 * Some osd helpers
214 *****************************************************************************/
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
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 };
266 struct ore_io_state *ios;
267 int ret;
268
269 ret = ore_get_io_state(&sbi->layout, &sbi->comps, &ios);
270 if (unlikely(ret)) {
271 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
272 return ret;
273 }
274
275 ios->in_attr = attrs;
276 ios->in_attr_len = ARRAY_SIZE(attrs);
277
278 ret = ore_read(ios);
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:
305 ore_put_io_state(ios);
306 return ret;
307 }
308
309 static void stats_done(struct ore_io_state *ios, void *p)
310 {
311 ore_put_io_state(ios);
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 };
321 struct ore_io_state *ios;
322 int ret;
323
324 ret = ore_get_io_state(&sbi->layout, &sbi->comps, &ios);
325 if (unlikely(ret)) {
326 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
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
334
335 ios->done = stats_done;
336 ios->private = sbi;
337 ios->out_attr = attrs;
338 ios->out_attr_len = ARRAY_SIZE(attrs);
339
340 ret = ore_write(ios);
341 if (unlikely(ret)) {
342 EXOFS_ERR("%s: ore_write failed.\n", __func__);
343 ore_put_io_state(ios);
344 }
345
346 return ret;
347 }
348
349 /******************************************************************************
350 * SUPERBLOCK FUNCTIONS
351 *****************************************************************************/
352 static const struct super_operations exofs_sops;
353 static const struct export_operations exofs_export_ops;
354
355 /*
356 * Write the superblock to the OSD
357 */
358 int exofs_sync_fs(struct super_block *sb, int wait)
359 {
360 struct exofs_sb_info *sbi;
361 struct exofs_fscb *fscb;
362 struct ore_comp one_comp;
363 struct ore_components comps;
364 struct ore_io_state *ios;
365 int ret = -ENOMEM;
366
367 fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
368 if (unlikely(!fscb))
369 return -ENOMEM;
370
371 sbi = sb->s_fs_info;
372
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 */
380
381 exofs_init_comps(&comps, &one_comp, sbi, EXOFS_SUPER_ID);
382
383 ret = ore_get_io_state(&sbi->layout, &comps, &ios);
384 if (unlikely(ret))
385 goto out;
386
387 lock_super(sb);
388
389 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
390 memset(fscb, 0, ios->length);
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;
395 fscb->s_version = EXOFS_FSCB_VER;
396
397 ios->offset = 0;
398 ios->kern_buff = fscb;
399
400 ret = ore_write(ios);
401 if (unlikely(ret))
402 EXOFS_ERR("%s: ore_write failed.\n", __func__);
403 else
404 sb->s_dirt = 0;
405
406
407 unlock_super(sb);
408 out:
409 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
410 ore_put_io_state(ios);
411 kfree(fscb);
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;
421 }
422
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
432 void exofs_free_sbi(struct exofs_sb_info *sbi)
433 {
434 while (sbi->comps.numdevs) {
435 int i = --sbi->comps.numdevs;
436 struct osd_dev *od = sbi->comps.ods[i];
437
438 if (od) {
439 sbi->comps.ods[i] = NULL;
440 osduld_put_device(od);
441 }
442 }
443 if (sbi->comps.ods != sbi->_min_one_dev)
444 kfree(sbi->comps.ods);
445 kfree(sbi);
446 }
447
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;
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__);
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
471 _exofs_print_device("Unmounting", NULL, sbi->comps.ods[0],
472 sbi->one_comp.obj.partition);
473
474 bdi_destroy(&sbi->bdi);
475 exofs_free_sbi(sbi);
476 sb->s_fs_info = NULL;
477 }
478
479 static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
480 struct exofs_device_table *dt)
481 {
482 u64 stripe_length;
483
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
497 /* FIXME: Only raid0 for now. if not so, do not mount */
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
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;
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 /
541 sbi->layout.mirrors_p1;
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 }
552
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);
562 return 0;
563 }
564
565 static unsigned __ra_pages(struct ore_layout *layout)
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
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
608 static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
609 struct osd_dev *fscb_od,
610 unsigned table_count)
611 {
612 struct ore_comp comp;
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
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);
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)) {
651 unsigned size = numdevs * sizeof(sbi->comps.ods[0]);
652
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)) {
658 EXOFS_ERR("ERROR: faild allocating Device array[%d]\n",
659 numdevs);
660 ret = -ENOMEM;
661 goto out;
662 }
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)) {
684 sbi->comps.ods[i] = fscb_od;
685 ++sbi->comps.numdevs;
686 fscb_od = NULL;
687 continue;
688 }
689
690 od = osduld_info_lookup(&odi);
691 if (IS_ERR(od)) {
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
698 sbi->comps.ods[i] = od;
699 ++sbi->comps.numdevs;
700
701 /* Read the fscb of the other devices to make sure the FS
702 * partition is there.
703 */
704 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
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);
721 if (likely(!ret)) {
722 unsigned numdevs = sbi->comps.numdevs;
723
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 }
737 return ret;
738 }
739
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 */
748 struct osd_dev *od; /* Master device */
749 struct exofs_fscb fscb; /*on-disk superblock info */
750 struct ore_comp comp;
751 unsigned table_count;
752 int ret;
753
754 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
755 if (!sbi)
756 return -ENOMEM;
757
758 /* use mount options to fill superblock */
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);
765 kfree(opts->dev_name);
766 opts->dev_name = NULL;
767 } else {
768 od = osduld_path_lookup(opts->dev_name);
769 }
770 if (IS_ERR(od)) {
771 ret = -EINVAL;
772 goto free_sbi;
773 }
774
775 /* Default layout in case we do not have a device-table */
776 sbi->layout.stripe_unit = PAGE_SIZE;
777 sbi->layout.mirrors_p1 = 1;
778 sbi->layout.group_width = 1;
779 sbi->layout.group_depth = -1;
780 sbi->layout.group_count = 1;
781 sbi->s_timeout = opts->timeout;
782
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
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
801 comp.obj.partition = sbi->one_comp.obj.partition;
802 comp.obj.id = EXOFS_SUPER_ID;
803 exofs_make_credential(comp.cred, &comp.obj);
804
805 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
806 if (unlikely(ret))
807 goto free_sbi;
808
809 sb->s_magic = le16_to_cpu(fscb.s_magic);
810 /* NOTE: we read below to be backward compatible with old versions */
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 }
821 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
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 }
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
832 table_count = le64_to_cpu(fscb.s_dev_table_count);
833 if (table_count) {
834 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
835 if (unlikely(ret))
836 goto free_sbi;
837 } else {
838 sbi->comps.ods[0] = od;
839 }
840
841 __sbi_read_stats(sbi);
842
843 /* set up operation vectors */
844 sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
845 sb->s_bdi = &sbi->bdi;
846 sb->s_fs_info = sbi;
847 sb->s_op = &exofs_sops;
848 sb->s_export_op = &exofs_export_ops;
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
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
878 _exofs_print_device("Mounting", opts->dev_name, sbi->comps.ods[0],
879 sbi->one_comp.obj.partition);
880 return 0;
881
882 free_sbi:
883 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
884 opts->dev_name, sbi->one_comp.obj.partition, ret);
885 exofs_free_sbi(sbi);
886 return ret;
887 }
888
889 /*
890 * Set up the superblock (calls exofs_fill_super eventually)
891 */
892 static struct dentry *exofs_mount(struct file_system_type *type,
893 int flags, const char *dev_name,
894 void *data)
895 {
896 struct exofs_mountopt opts;
897 int ret;
898
899 ret = parse_options(data, &opts);
900 if (ret)
901 return ERR_PTR(ret);
902
903 if (!opts.dev_name)
904 opts.dev_name = dev_name;
905 return mount_nodev(type, flags, &opts, exofs_fill_super);
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;
916 struct ore_io_state *ios;
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;
925 int ret;
926
927 ret = ore_get_io_state(&sbi->layout, &sbi->comps, &ios);
928 if (ret) {
929 EXOFS_DBGMSG("ore_get_io_state failed.\n");
930 return ret;
931 }
932
933 ios->in_attr = attrs;
934 ios->in_attr_len = ARRAY_SIZE(attrs);
935
936 ret = ore_read(ios);
937 if (unlikely(ret))
938 goto out;
939
940 ret = extract_attr_from_ios(ios, &attrs[0]);
941 if (likely(!ret)) {
942 capacity = get_unaligned_be64(attrs[0].val_ptr);
943 if (unlikely(!capacity))
944 capacity = ULLONG_MAX;
945 } else
946 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
947
948 ret = extract_attr_from_ios(ios, &attrs[1]);
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;
957 buf->f_blocks = capacity >> 9;
958 buf->f_bfree = (capacity - used) >> 9;
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:
965 ore_put_io_state(ios);
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,
973 .evict_inode = exofs_evict_inode,
974 .put_super = exofs_put_super,
975 .write_super = exofs_write_super,
976 .sync_fs = exofs_sync_fs,
977 .statfs = exofs_statfs,
978 };
979
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)
989 return ERR_PTR(-ESTALE);
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
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",
1040 .mount = exofs_mount,
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)
Linux Btrfs Development