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kvm tools, setup: Create private directory
[linux-2.6/next.git] / fs / exofs / super.c
blob06065bd37fc339070948a141cd8063c9d39af8ad
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 /******************************************************************************
44 * MOUNT OPTIONS
45 *****************************************************************************/
46
47 /*
48 * struct to hold what we get from mount options
49 */
50 struct exofs_mountopt {
51 bool is_osdname;
52 const char *dev_name;
53 uint64_t pid;
54 int timeout;
55 };
56
57 /*
58 * exofs-specific mount-time options.
59 */
60 enum { Opt_name, Opt_pid, Opt_to, Opt_err };
61
62 /*
63 * Our mount-time options. These should ideally be 64-bit unsigned, but the
64 * kernel's parsing functions do not currently support that. 32-bit should be
65 * sufficient for most applications now.
66 */
67 static match_table_t tokens = {
68 {Opt_name, "osdname=%s"},
69 {Opt_pid, "pid=%u"},
70 {Opt_to, "to=%u"},
71 {Opt_err, NULL}
72 };
73
74 /*
75 * The main option parsing method. Also makes sure that all of the mandatory
76 * mount options were set.
77 */
78 static int parse_options(char *options, struct exofs_mountopt *opts)
79 {
80 char *p;
81 substring_t args[MAX_OPT_ARGS];
82 int option;
83 bool s_pid = false;
84
85 EXOFS_DBGMSG("parse_options %s\n", options);
86 /* defaults */
87 memset(opts, 0, sizeof(*opts));
88 opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
89
90 while ((p = strsep(&options, ",")) != NULL) {
91 int token;
92 char str[32];
93
94 if (!*p)
95 continue;
96
97 token = match_token(p, tokens, args);
98 switch (token) {
99 case Opt_name:
100 opts->dev_name = match_strdup(&args[0]);
101 if (unlikely(!opts->dev_name)) {
102 EXOFS_ERR("Error allocating dev_name");
103 return -ENOMEM;
104 }
105 opts->is_osdname = true;
106 break;
107 case Opt_pid:
108 if (0 == match_strlcpy(str, &args[0], sizeof(str)))
109 return -EINVAL;
110 opts->pid = simple_strtoull(str, NULL, 0);
111 if (opts->pid < EXOFS_MIN_PID) {
112 EXOFS_ERR("Partition ID must be >= %u",
113 EXOFS_MIN_PID);
114 return -EINVAL;
115 }
116 s_pid = 1;
117 break;
118 case Opt_to:
119 if (match_int(&args[0], &option))
120 return -EINVAL;
121 if (option <= 0) {
122 EXOFS_ERR("Timout must be > 0");
123 return -EINVAL;
124 }
125 opts->timeout = option * HZ;
126 break;
127 }
128 }
129
130 if (!s_pid) {
131 EXOFS_ERR("Need to specify the following options:\n");
132 EXOFS_ERR(" -o pid=pid_no_to_use\n");
133 return -EINVAL;
134 }
135
136 return 0;
137 }
138
139 /******************************************************************************
140 * INODE CACHE
141 *****************************************************************************/
142
143 /*
144 * Our inode cache. Isn't it pretty?
145 */
146 static struct kmem_cache *exofs_inode_cachep;
147
148 /*
149 * Allocate an inode in the cache
150 */
151 static struct inode *exofs_alloc_inode(struct super_block *sb)
152 {
153 struct exofs_i_info *oi;
154
155 oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
156 if (!oi)
157 return NULL;
158
159 oi->vfs_inode.i_version = 1;
160 return &oi->vfs_inode;
161 }
162
163 static void exofs_i_callback(struct rcu_head *head)
164 {
165 struct inode *inode = container_of(head, struct inode, i_rcu);
166 INIT_LIST_HEAD(&inode->i_dentry);
167 kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
168 }
169
170 /*
171 * Remove an inode from the cache
172 */
173 static void exofs_destroy_inode(struct inode *inode)
174 {
175 call_rcu(&inode->i_rcu, exofs_i_callback);
176 }
177
178 /*
179 * Initialize the inode
180 */
181 static void exofs_init_once(void *foo)
182 {
183 struct exofs_i_info *oi = foo;
184
185 inode_init_once(&oi->vfs_inode);
186 }
187
188 /*
189 * Create and initialize the inode cache
190 */
191 static int init_inodecache(void)
192 {
193 exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
194 sizeof(struct exofs_i_info), 0,
195 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
196 exofs_init_once);
197 if (exofs_inode_cachep == NULL)
198 return -ENOMEM;
199 return 0;
200 }
201
202 /*
203 * Destroy the inode cache
204 */
205 static void destroy_inodecache(void)
206 {
207 kmem_cache_destroy(exofs_inode_cachep);
208 }
209
210 /******************************************************************************
211 * SUPERBLOCK FUNCTIONS
212 *****************************************************************************/
213 static const struct super_operations exofs_sops;
214 static const struct export_operations exofs_export_ops;
215
216 static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
217 EXOFS_APAGE_SB_DATA,
218 EXOFS_ATTR_SB_STATS,
219 sizeof(struct exofs_sb_stats));
220
221 static int __sbi_read_stats(struct exofs_sb_info *sbi)
222 {
223 struct osd_attr attrs[] = {
224 [0] = g_attr_sb_stats,
225 };
226 struct exofs_io_state *ios;
227 int ret;
228
229 ret = exofs_get_io_state(&sbi->layout, &ios);
230 if (unlikely(ret)) {
231 EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
232 return ret;
233 }
234
235 ios->cred = sbi->s_cred;
236
237 ios->in_attr = attrs;
238 ios->in_attr_len = ARRAY_SIZE(attrs);
239
240 ret = exofs_sbi_read(ios);
241 if (unlikely(ret)) {
242 EXOFS_ERR("Error reading super_block stats => %d\n", ret);
243 goto out;
244 }
245
246 ret = extract_attr_from_ios(ios, &attrs[0]);
247 if (ret) {
248 EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
249 goto out;
250 }
251 if (attrs[0].len) {
252 struct exofs_sb_stats *ess;
253
254 if (unlikely(attrs[0].len != sizeof(*ess))) {
255 EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
256 "size(%d) != expected(%zd)\n",
257 __func__, attrs[0].len, sizeof(*ess));
258 goto out;
259 }
260
261 ess = attrs[0].val_ptr;
262 sbi->s_nextid = le64_to_cpu(ess->s_nextid);
263 sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
264 }
265
266 out:
267 exofs_put_io_state(ios);
268 return ret;
269 }
270
271 static void stats_done(struct exofs_io_state *ios, void *p)
272 {
273 exofs_put_io_state(ios);
274 /* Good thanks nothing to do anymore */
275 }
276
277 /* Asynchronously write the stats attribute */
278 int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
279 {
280 struct osd_attr attrs[] = {
281 [0] = g_attr_sb_stats,
282 };
283 struct exofs_io_state *ios;
284 int ret;
285
286 ret = exofs_get_io_state(&sbi->layout, &ios);
287 if (unlikely(ret)) {
288 EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
289 return ret;
290 }
291
292 sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid);
293 sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
294 attrs[0].val_ptr = &sbi->s_ess;
295
296 ios->cred = sbi->s_cred;
297 ios->done = stats_done;
298 ios->private = sbi;
299 ios->out_attr = attrs;
300 ios->out_attr_len = ARRAY_SIZE(attrs);
301
302 ret = exofs_sbi_write(ios);
303 if (unlikely(ret)) {
304 EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
305 exofs_put_io_state(ios);
306 }
307
308 return ret;
309 }
310
311 /*
312 * Write the superblock to the OSD
313 */
314 int exofs_sync_fs(struct super_block *sb, int wait)
315 {
316 struct exofs_sb_info *sbi;
317 struct exofs_fscb *fscb;
318 struct exofs_io_state *ios;
319 int ret = -ENOMEM;
320
321 fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
322 if (unlikely(!fscb))
323 return -ENOMEM;
324
325 sbi = sb->s_fs_info;
326
327 /* NOTE: We no longer dirty the super_block anywhere in exofs. The
328 * reason we write the fscb here on unmount is so we can stay backwards
329 * compatible with fscb->s_version == 1. (What we are not compatible
330 * with is if a new version FS crashed and then we try to mount an old
331 * version). Otherwise the exofs_fscb is read-only from mkfs time. All
332 * the writeable info is set in exofs_sbi_write_stats() above.
333 */
334 ret = exofs_get_io_state(&sbi->layout, &ios);
335 if (unlikely(ret))
336 goto out;
337
338 lock_super(sb);
339
340 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
341 memset(fscb, 0, ios->length);
342 fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
343 fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
344 fscb->s_magic = cpu_to_le16(sb->s_magic);
345 fscb->s_newfs = 0;
346 fscb->s_version = EXOFS_FSCB_VER;
347
348 ios->obj.id = EXOFS_SUPER_ID;
349 ios->offset = 0;
350 ios->kern_buff = fscb;
351 ios->cred = sbi->s_cred;
352
353 ret = exofs_sbi_write(ios);
354 if (unlikely(ret))
355 EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
356 else
357 sb->s_dirt = 0;
358
359
360 unlock_super(sb);
361 out:
362 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
363 exofs_put_io_state(ios);
364 kfree(fscb);
365 return ret;
366 }
367
368 static void exofs_write_super(struct super_block *sb)
369 {
370 if (!(sb->s_flags & MS_RDONLY))
371 exofs_sync_fs(sb, 1);
372 else
373 sb->s_dirt = 0;
374 }
375
376 static void _exofs_print_device(const char *msg, const char *dev_path,
377 struct osd_dev *od, u64 pid)
378 {
379 const struct osd_dev_info *odi = osduld_device_info(od);
380
381 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
382 msg, dev_path ?: "", odi->osdname, _LLU(pid));
383 }
384
385 void exofs_free_sbi(struct exofs_sb_info *sbi)
386 {
387 while (sbi->layout.s_numdevs) {
388 int i = --sbi->layout.s_numdevs;
389 struct osd_dev *od = sbi->layout.s_ods[i];
390
391 if (od) {
392 sbi->layout.s_ods[i] = NULL;
393 osduld_put_device(od);
394 }
395 }
396 kfree(sbi);
397 }
398
399 /*
400 * This function is called when the vfs is freeing the superblock. We just
401 * need to free our own part.
402 */
403 static void exofs_put_super(struct super_block *sb)
404 {
405 int num_pend;
406 struct exofs_sb_info *sbi = sb->s_fs_info;
407
408 /* make sure there are no pending commands */
409 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
410 num_pend = atomic_read(&sbi->s_curr_pending)) {
411 wait_queue_head_t wq;
412
413 printk(KERN_NOTICE "%s: !!Pending operations in flight. "
414 "This is a BUG. please report to osd-dev@open-osd.org\n",
415 __func__);
416 init_waitqueue_head(&wq);
417 wait_event_timeout(wq,
418 (atomic_read(&sbi->s_curr_pending) == 0),
419 msecs_to_jiffies(100));
420 }
421
422 _exofs_print_device("Unmounting", NULL, sbi->layout.s_ods[0],
423 sbi->layout.s_pid);
424
425 bdi_destroy(&sbi->bdi);
426 exofs_free_sbi(sbi);
427 sb->s_fs_info = NULL;
428 }
429
430 static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
431 struct exofs_device_table *dt)
432 {
433 u64 stripe_length;
434
435 sbi->data_map.odm_num_comps =
436 le32_to_cpu(dt->dt_data_map.cb_num_comps);
437 sbi->data_map.odm_stripe_unit =
438 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
439 sbi->data_map.odm_group_width =
440 le32_to_cpu(dt->dt_data_map.cb_group_width);
441 sbi->data_map.odm_group_depth =
442 le32_to_cpu(dt->dt_data_map.cb_group_depth);
443 sbi->data_map.odm_mirror_cnt =
444 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt);
445 sbi->data_map.odm_raid_algorithm =
446 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
447
448 /* FIXME: Only raid0 for now. if not so, do not mount */
449 if (sbi->data_map.odm_num_comps != numdevs) {
450 EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n",
451 sbi->data_map.odm_num_comps, numdevs);
452 return -EINVAL;
453 }
454 if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) {
455 EXOFS_ERR("Only RAID_0 for now\n");
456 return -EINVAL;
457 }
458 if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) {
459 EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n",
460 numdevs, sbi->data_map.odm_mirror_cnt);
461 return -EINVAL;
462 }
463
464 if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) {
465 EXOFS_ERR("Stripe Unit(0x%llx)"
466 " must be Multples of PAGE_SIZE(0x%lx)\n",
467 _LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE);
468 return -EINVAL;
469 }
470
471 sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit;
472 sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1;
473
474 if (sbi->data_map.odm_group_width) {
475 sbi->layout.group_width = sbi->data_map.odm_group_width;
476 sbi->layout.group_depth = sbi->data_map.odm_group_depth;
477 if (!sbi->layout.group_depth) {
478 EXOFS_ERR("group_depth == 0 && group_width != 0\n");
479 return -EINVAL;
480 }
481 sbi->layout.group_count = sbi->data_map.odm_num_comps /
482 sbi->layout.mirrors_p1 /
483 sbi->data_map.odm_group_width;
484 } else {
485 if (sbi->data_map.odm_group_depth) {
486 printk(KERN_NOTICE "Warning: group_depth ignored "
487 "group_width == 0 && group_depth == %d\n",
488 sbi->data_map.odm_group_depth);
489 sbi->data_map.odm_group_depth = 0;
490 }
491 sbi->layout.group_width = sbi->data_map.odm_num_comps /
492 sbi->layout.mirrors_p1;
493 sbi->layout.group_depth = -1;
494 sbi->layout.group_count = 1;
495 }
496
497 stripe_length = (u64)sbi->layout.group_width * sbi->layout.stripe_unit;
498 if (stripe_length >= (1ULL << 32)) {
499 EXOFS_ERR("Total Stripe length(0x%llx)"
500 " >= 32bit is not supported\n", _LLU(stripe_length));
501 return -EINVAL;
502 }
503
504 return 0;
505 }
506
507 static unsigned __ra_pages(struct exofs_layout *layout)
508 {
509 const unsigned _MIN_RA = 32; /* min 128K read-ahead */
510 unsigned ra_pages = layout->group_width * layout->stripe_unit /
511 PAGE_SIZE;
512 unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
513
514 ra_pages *= 2; /* two stripes */
515 if (ra_pages < _MIN_RA)
516 ra_pages = roundup(_MIN_RA, ra_pages / 2);
517
518 if (ra_pages > max_io_pages)
519 ra_pages = max_io_pages;
520
521 return ra_pages;
522 }
523
524 /* @odi is valid only as long as @fscb_dev is valid */
525 static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
526 struct osd_dev_info *odi)
527 {
528 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
529 memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len);
530
531 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
532 odi->osdname = dt_dev->osdname;
533
534 /* FIXME support long names. Will need a _put function */
535 if (dt_dev->long_name_offset)
536 return -EINVAL;
537
538 /* Make sure osdname is printable!
539 * mkexofs should give us space for a null-terminator else the
540 * device-table is invalid.
541 */
542 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
543 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
544 dt_dev->osdname[odi->osdname_len] = 0;
545
546 /* If it's all zeros something is bad we read past end-of-obj */
547 return !(odi->systemid_len || odi->osdname_len);
548 }
549
550 static int exofs_read_lookup_dev_table(struct exofs_sb_info **psbi,
551 unsigned table_count)
552 {
553 struct exofs_sb_info *sbi = *psbi;
554 struct osd_dev *fscb_od;
555 struct osd_obj_id obj = {.partition = sbi->layout.s_pid,
556 .id = EXOFS_DEVTABLE_ID};
557 struct exofs_device_table *dt;
558 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
559 sizeof(*dt);
560 unsigned numdevs, i;
561 int ret;
562
563 dt = kmalloc(table_bytes, GFP_KERNEL);
564 if (unlikely(!dt)) {
565 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
566 table_bytes);
567 return -ENOMEM;
568 }
569
570 fscb_od = sbi->layout.s_ods[0];
571 sbi->layout.s_ods[0] = NULL;
572 sbi->layout.s_numdevs = 0;
573 ret = exofs_read_kern(fscb_od, sbi->s_cred, &obj, 0, dt, table_bytes);
574 if (unlikely(ret)) {
575 EXOFS_ERR("ERROR: reading device table\n");
576 goto out;
577 }
578
579 numdevs = le64_to_cpu(dt->dt_num_devices);
580 if (unlikely(!numdevs)) {
581 ret = -EINVAL;
582 goto out;
583 }
584 WARN_ON(table_count != numdevs);
585
586 ret = _read_and_match_data_map(sbi, numdevs, dt);
587 if (unlikely(ret))
588 goto out;
589
590 if (likely(numdevs > 1)) {
591 unsigned size = numdevs * sizeof(sbi->layout.s_ods[0]);
592
593 sbi = krealloc(sbi, sizeof(*sbi) + size, GFP_KERNEL);
594 if (unlikely(!sbi)) {
595 ret = -ENOMEM;
596 goto out;
597 }
598 memset(&sbi->layout.s_ods[1], 0,
599 size - sizeof(sbi->layout.s_ods[0]));
600 *psbi = sbi;
601 }
602
603 for (i = 0; i < numdevs; i++) {
604 struct exofs_fscb fscb;
605 struct osd_dev_info odi;
606 struct osd_dev *od;
607
608 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
609 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
610 ret = -EINVAL;
611 goto out;
612 }
613
614 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
615 i, odi.osdname);
616
617 /* On all devices the device table is identical. The user can
618 * specify any one of the participating devices on the command
619 * line. We always keep them in device-table order.
620 */
621 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
622 sbi->layout.s_ods[i] = fscb_od;
623 ++sbi->layout.s_numdevs;
624 fscb_od = NULL;
625 continue;
626 }
627
628 od = osduld_info_lookup(&odi);
629 if (IS_ERR(od)) {
630 ret = PTR_ERR(od);
631 EXOFS_ERR("ERROR: device requested is not found "
632 "osd_name-%s =>%d\n", odi.osdname, ret);
633 goto out;
634 }
635
636 sbi->layout.s_ods[i] = od;
637 ++sbi->layout.s_numdevs;
638
639 /* Read the fscb of the other devices to make sure the FS
640 * partition is there.
641 */
642 ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb,
643 sizeof(fscb));
644 if (unlikely(ret)) {
645 EXOFS_ERR("ERROR: Malformed participating device "
646 "error reading fscb osd_name-%s\n",
647 odi.osdname);
648 goto out;
649 }
650
651 /* TODO: verify other information is correct and FS-uuid
652 * matches. Benny what did you say about device table
653 * generation and old devices?
654 */
655 }
656
657 out:
658 kfree(dt);
659 if (unlikely(!ret && fscb_od)) {
660 EXOFS_ERR(
661 "ERROR: Bad device-table container device not present\n");
662 osduld_put_device(fscb_od);
663 ret = -EINVAL;
664 }
665
666 return ret;
667 }
668
669 /*
670 * Read the superblock from the OSD and fill in the fields
671 */
672 static int exofs_fill_super(struct super_block *sb, void *data, int silent)
673 {
674 struct inode *root;
675 struct exofs_mountopt *opts = data;
676 struct exofs_sb_info *sbi; /*extended info */
677 struct osd_dev *od; /* Master device */
678 struct exofs_fscb fscb; /*on-disk superblock info */
679 struct osd_obj_id obj;
680 unsigned table_count;
681 int ret;
682
683 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
684 if (!sbi)
685 return -ENOMEM;
686
687 ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
688 if (ret)
689 goto free_bdi;
690
691 /* use mount options to fill superblock */
692 if (opts->is_osdname) {
693 struct osd_dev_info odi = {.systemid_len = 0};
694
695 odi.osdname_len = strlen(opts->dev_name);
696 odi.osdname = (u8 *)opts->dev_name;
697 od = osduld_info_lookup(&odi);
698 } else {
699 od = osduld_path_lookup(opts->dev_name);
700 }
701 if (IS_ERR(od)) {
702 ret = -EINVAL;
703 goto free_sbi;
704 }
705
706 /* Default layout in case we do not have a device-table */
707 sbi->layout.stripe_unit = PAGE_SIZE;
708 sbi->layout.mirrors_p1 = 1;
709 sbi->layout.group_width = 1;
710 sbi->layout.group_depth = -1;
711 sbi->layout.group_count = 1;
712 sbi->layout.s_ods[0] = od;
713 sbi->layout.s_numdevs = 1;
714 sbi->layout.s_pid = opts->pid;
715 sbi->s_timeout = opts->timeout;
716
717 /* fill in some other data by hand */
718 memset(sb->s_id, 0, sizeof(sb->s_id));
719 strcpy(sb->s_id, "exofs");
720 sb->s_blocksize = EXOFS_BLKSIZE;
721 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
722 sb->s_maxbytes = MAX_LFS_FILESIZE;
723 atomic_set(&sbi->s_curr_pending, 0);
724 sb->s_bdev = NULL;
725 sb->s_dev = 0;
726
727 obj.partition = sbi->layout.s_pid;
728 obj.id = EXOFS_SUPER_ID;
729 exofs_make_credential(sbi->s_cred, &obj);
730
731 ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, sizeof(fscb));
732 if (unlikely(ret))
733 goto free_sbi;
734
735 sb->s_magic = le16_to_cpu(fscb.s_magic);
736 /* NOTE: we read below to be backward compatible with old versions */
737 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
738 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
739
740 /* make sure what we read from the object store is correct */
741 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
742 if (!silent)
743 EXOFS_ERR("ERROR: Bad magic value\n");
744 ret = -EINVAL;
745 goto free_sbi;
746 }
747 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
748 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
749 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
750 ret = -EINVAL;
751 goto free_sbi;
752 }
753
754 /* start generation numbers from a random point */
755 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
756 spin_lock_init(&sbi->s_next_gen_lock);
757
758 table_count = le64_to_cpu(fscb.s_dev_table_count);
759 if (table_count) {
760 ret = exofs_read_lookup_dev_table(&sbi, table_count);
761 if (unlikely(ret))
762 goto free_sbi;
763 }
764
765 __sbi_read_stats(sbi);
766
767 /* set up operation vectors */
768 sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
769 sb->s_bdi = &sbi->bdi;
770 sb->s_fs_info = sbi;
771 sb->s_op = &exofs_sops;
772 sb->s_export_op = &exofs_export_ops;
773 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
774 if (IS_ERR(root)) {
775 EXOFS_ERR("ERROR: exofs_iget failed\n");
776 ret = PTR_ERR(root);
777 goto free_sbi;
778 }
779 sb->s_root = d_alloc_root(root);
780 if (!sb->s_root) {
781 iput(root);
782 EXOFS_ERR("ERROR: get root inode failed\n");
783 ret = -ENOMEM;
784 goto free_sbi;
785 }
786
787 if (!S_ISDIR(root->i_mode)) {
788 dput(sb->s_root);
789 sb->s_root = NULL;
790 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
791 root->i_mode);
792 ret = -EINVAL;
793 goto free_sbi;
794 }
795
796 _exofs_print_device("Mounting", opts->dev_name, sbi->layout.s_ods[0],
797 sbi->layout.s_pid);
798 if (opts->is_osdname)
799 kfree(opts->dev_name);
800 return 0;
801
802 free_sbi:
803 bdi_destroy(&sbi->bdi);
804 free_bdi:
805 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
806 opts->dev_name, sbi->layout.s_pid, ret);
807 exofs_free_sbi(sbi);
808 if (opts->is_osdname)
809 kfree(opts->dev_name);
810 return ret;
811 }
812
813 /*
814 * Set up the superblock (calls exofs_fill_super eventually)
815 */
816 static struct dentry *exofs_mount(struct file_system_type *type,
817 int flags, const char *dev_name,
818 void *data)
819 {
820 struct exofs_mountopt opts;
821 int ret;
822
823 ret = parse_options(data, &opts);
824 if (ret)
825 return ERR_PTR(ret);
826
827 if (!opts.dev_name)
828 opts.dev_name = dev_name;
829 return mount_nodev(type, flags, &opts, exofs_fill_super);
830 }
831
832 /*
833 * Return information about the file system state in the buffer. This is used
834 * by the 'df' command, for example.
835 */
836 static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
837 {
838 struct super_block *sb = dentry->d_sb;
839 struct exofs_sb_info *sbi = sb->s_fs_info;
840 struct exofs_io_state *ios;
841 struct osd_attr attrs[] = {
842 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
843 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
844 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
845 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
846 };
847 uint64_t capacity = ULLONG_MAX;
848 uint64_t used = ULLONG_MAX;
849 uint8_t cred_a[OSD_CAP_LEN];
850 int ret;
851
852 ret = exofs_get_io_state(&sbi->layout, &ios);
853 if (ret) {
854 EXOFS_DBGMSG("exofs_get_io_state failed.\n");
855 return ret;
856 }
857
858 exofs_make_credential(cred_a, &ios->obj);
859 ios->cred = sbi->s_cred;
860 ios->in_attr = attrs;
861 ios->in_attr_len = ARRAY_SIZE(attrs);
862
863 ret = exofs_sbi_read(ios);
864 if (unlikely(ret))
865 goto out;
866
867 ret = extract_attr_from_ios(ios, &attrs[0]);
868 if (likely(!ret)) {
869 capacity = get_unaligned_be64(attrs[0].val_ptr);
870 if (unlikely(!capacity))
871 capacity = ULLONG_MAX;
872 } else
873 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
874
875 ret = extract_attr_from_ios(ios, &attrs[1]);
876 if (likely(!ret))
877 used = get_unaligned_be64(attrs[1].val_ptr);
878 else
879 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
880
881 /* fill in the stats buffer */
882 buf->f_type = EXOFS_SUPER_MAGIC;
883 buf->f_bsize = EXOFS_BLKSIZE;
884 buf->f_blocks = capacity >> 9;
885 buf->f_bfree = (capacity - used) >> 9;
886 buf->f_bavail = buf->f_bfree;
887 buf->f_files = sbi->s_numfiles;
888 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
889 buf->f_namelen = EXOFS_NAME_LEN;
890
891 out:
892 exofs_put_io_state(ios);
893 return ret;
894 }
895
896 static const struct super_operations exofs_sops = {
897 .alloc_inode = exofs_alloc_inode,
898 .destroy_inode = exofs_destroy_inode,
899 .write_inode = exofs_write_inode,
900 .evict_inode = exofs_evict_inode,
901 .put_super = exofs_put_super,
902 .write_super = exofs_write_super,
903 .sync_fs = exofs_sync_fs,
904 .statfs = exofs_statfs,
905 };
906
907 /******************************************************************************
908 * EXPORT OPERATIONS
909 *****************************************************************************/
910
911 struct dentry *exofs_get_parent(struct dentry *child)
912 {
913 unsigned long ino = exofs_parent_ino(child);
914
915 if (!ino)
916 return NULL;
917
918 return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
919 }
920
921 static struct inode *exofs_nfs_get_inode(struct super_block *sb,
922 u64 ino, u32 generation)
923 {
924 struct inode *inode;
925
926 inode = exofs_iget(sb, ino);
927 if (IS_ERR(inode))
928 return ERR_CAST(inode);
929 if (generation && inode->i_generation != generation) {
930 /* we didn't find the right inode.. */
931 iput(inode);
932 return ERR_PTR(-ESTALE);
933 }
934 return inode;
935 }
936
937 static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
938 struct fid *fid, int fh_len, int fh_type)
939 {
940 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
941 exofs_nfs_get_inode);
942 }
943
944 static struct dentry *exofs_fh_to_parent(struct super_block *sb,
945 struct fid *fid, int fh_len, int fh_type)
946 {
947 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
948 exofs_nfs_get_inode);
949 }
950
951 static const struct export_operations exofs_export_ops = {
952 .fh_to_dentry = exofs_fh_to_dentry,
953 .fh_to_parent = exofs_fh_to_parent,
954 .get_parent = exofs_get_parent,
955 };
956
957 /******************************************************************************
958 * INSMOD/RMMOD
959 *****************************************************************************/
960
961 /*
962 * struct that describes this file system
963 */
964 static struct file_system_type exofs_type = {
965 .owner = THIS_MODULE,
966 .name = "exofs",
967 .mount = exofs_mount,
968 .kill_sb = generic_shutdown_super,
969 };
970
971 static int __init init_exofs(void)
972 {
973 int err;
974
975 err = init_inodecache();
976 if (err)
977 goto out;
978
979 err = register_filesystem(&exofs_type);
980 if (err)
981 goto out_d;
982
983 return 0;
984 out_d:
985 destroy_inodecache();
986 out:
987 return err;
988 }
989
990 static void __exit exit_exofs(void)
991 {
992 unregister_filesystem(&exofs_type);
993 destroy_inodecache();
994 }
995
996 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
997 MODULE_DESCRIPTION("exofs");
998 MODULE_LICENSE("GPL");
999
1000 module_init(init_exofs)
1001 module_exit(exit_exofs)
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