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