Loading...
Note: File does not exist in v6.8.
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/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 */
53struct 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 */
63enum { 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 */
70static 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 */
81static 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("Timout 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 */
149static struct kmem_cache *exofs_inode_cachep;
150
151/*
152 * Allocate an inode in the cache
153 */
154static 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
166static 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 */
175static 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 */
183static 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 */
193static 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 */
207static void destroy_inodecache(void)
208{
209 kmem_cache_destroy(exofs_inode_cachep);
210}
211
212/******************************************************************************
213 * Some osd helpers
214 *****************************************************************************/
215void 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
220static 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
248out:
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
256static 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
261static 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->oc, &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
304out:
305 ore_put_io_state(ios);
306 return ret;
307}
308
309static 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 */
316int 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->oc, &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 *****************************************************************************/
352static const struct super_operations exofs_sops;
353static const struct export_operations exofs_export_ops;
354
355/*
356 * Write the superblock to the OSD
357 */
358static 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 oc;
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(&oc, &one_comp, sbi, EXOFS_SUPER_ID);
382
383 ret = ore_get_io_state(&sbi->layout, &oc, &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_le64(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);
408out:
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
415static 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
423static 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
432static void exofs_free_sbi(struct exofs_sb_info *sbi)
433{
434 unsigned numdevs = sbi->oc.numdevs;
435
436 while (numdevs) {
437 unsigned i = --numdevs;
438 struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
439
440 if (od) {
441 ore_comp_set_dev(&sbi->oc, i, NULL);
442 osduld_put_device(od);
443 }
444 }
445 kfree(sbi->oc.ods);
446 kfree(sbi);
447}
448
449/*
450 * This function is called when the vfs is freeing the superblock. We just
451 * need to free our own part.
452 */
453static void exofs_put_super(struct super_block *sb)
454{
455 int num_pend;
456 struct exofs_sb_info *sbi = sb->s_fs_info;
457
458 /* make sure there are no pending commands */
459 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
460 num_pend = atomic_read(&sbi->s_curr_pending)) {
461 wait_queue_head_t wq;
462
463 printk(KERN_NOTICE "%s: !!Pending operations in flight. "
464 "This is a BUG. please report to osd-dev@open-osd.org\n",
465 __func__);
466 init_waitqueue_head(&wq);
467 wait_event_timeout(wq,
468 (atomic_read(&sbi->s_curr_pending) == 0),
469 msecs_to_jiffies(100));
470 }
471
472 _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
473 sbi->one_comp.obj.partition);
474
475 exofs_sysfs_sb_del(sbi);
476 bdi_destroy(&sbi->bdi);
477 exofs_free_sbi(sbi);
478 sb->s_fs_info = NULL;
479}
480
481static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
482 struct exofs_device_table *dt)
483{
484 int ret;
485
486 sbi->layout.stripe_unit =
487 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
488 sbi->layout.group_width =
489 le32_to_cpu(dt->dt_data_map.cb_group_width);
490 sbi->layout.group_depth =
491 le32_to_cpu(dt->dt_data_map.cb_group_depth);
492 sbi->layout.mirrors_p1 =
493 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;
494 sbi->layout.raid_algorithm =
495 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
496
497 ret = ore_verify_layout(numdevs, &sbi->layout);
498
499 EXOFS_DBGMSG("exofs: layout: "
500 "num_comps=%u stripe_unit=0x%x group_width=%u "
501 "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n",
502 numdevs,
503 sbi->layout.stripe_unit,
504 sbi->layout.group_width,
505 _LLU(sbi->layout.group_depth),
506 sbi->layout.mirrors_p1,
507 sbi->layout.raid_algorithm);
508 return ret;
509}
510
511static unsigned __ra_pages(struct ore_layout *layout)
512{
513 const unsigned _MIN_RA = 32; /* min 128K read-ahead */
514 unsigned ra_pages = layout->group_width * layout->stripe_unit /
515 PAGE_SIZE;
516 unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
517
518 ra_pages *= 2; /* two stripes */
519 if (ra_pages < _MIN_RA)
520 ra_pages = roundup(_MIN_RA, ra_pages / 2);
521
522 if (ra_pages > max_io_pages)
523 ra_pages = max_io_pages;
524
525 return ra_pages;
526}
527
528/* @odi is valid only as long as @fscb_dev is valid */
529static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
530 struct osd_dev_info *odi)
531{
532 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
533 if (likely(odi->systemid_len))
534 memcpy(odi->systemid, dt_dev->systemid, OSD_SYSTEMID_LEN);
535
536 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
537 odi->osdname = dt_dev->osdname;
538
539 /* FIXME support long names. Will need a _put function */
540 if (dt_dev->long_name_offset)
541 return -EINVAL;
542
543 /* Make sure osdname is printable!
544 * mkexofs should give us space for a null-terminator else the
545 * device-table is invalid.
546 */
547 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
548 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
549 dt_dev->osdname[odi->osdname_len] = 0;
550
551 /* If it's all zeros something is bad we read past end-of-obj */
552 return !(odi->systemid_len || odi->osdname_len);
553}
554
555int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
556 struct exofs_dev **peds)
557{
558 struct __alloc_ore_devs_and_exofs_devs {
559 /* Twice bigger table: See exofs_init_comps() and comment at
560 * exofs_read_lookup_dev_table()
561 */
562 struct ore_dev *oreds[numdevs * 2 - 1];
563 struct exofs_dev eds[numdevs];
564 } *aoded;
565 struct exofs_dev *eds;
566 unsigned i;
567
568 aoded = kzalloc(sizeof(*aoded), GFP_KERNEL);
569 if (unlikely(!aoded)) {
570 EXOFS_ERR("ERROR: failed allocating Device array[%d]\n",
571 numdevs);
572 return -ENOMEM;
573 }
574
575 sbi->oc.ods = aoded->oreds;
576 *peds = eds = aoded->eds;
577 for (i = 0; i < numdevs; ++i)
578 aoded->oreds[i] = &eds[i].ored;
579 return 0;
580}
581
582static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
583 struct osd_dev *fscb_od,
584 unsigned table_count)
585{
586 struct ore_comp comp;
587 struct exofs_device_table *dt;
588 struct exofs_dev *eds;
589 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
590 sizeof(*dt);
591 unsigned numdevs, i;
592 int ret;
593
594 dt = kmalloc(table_bytes, GFP_KERNEL);
595 if (unlikely(!dt)) {
596 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
597 table_bytes);
598 return -ENOMEM;
599 }
600
601 sbi->oc.numdevs = 0;
602
603 comp.obj.partition = sbi->one_comp.obj.partition;
604 comp.obj.id = EXOFS_DEVTABLE_ID;
605 exofs_make_credential(comp.cred, &comp.obj);
606
607 ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt,
608 table_bytes);
609 if (unlikely(ret)) {
610 EXOFS_ERR("ERROR: reading device table\n");
611 goto out;
612 }
613
614 numdevs = le64_to_cpu(dt->dt_num_devices);
615 if (unlikely(!numdevs)) {
616 ret = -EINVAL;
617 goto out;
618 }
619 WARN_ON(table_count != numdevs);
620
621 ret = _read_and_match_data_map(sbi, numdevs, dt);
622 if (unlikely(ret))
623 goto out;
624
625 ret = __alloc_dev_table(sbi, numdevs, &eds);
626 if (unlikely(ret))
627 goto out;
628 /* exofs round-robins the device table view according to inode
629 * number. We hold a: twice bigger table hence inodes can point
630 * to any device and have a sequential view of the table
631 * starting at this device. See exofs_init_comps()
632 */
633 memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
634 (numdevs - 1) * sizeof(sbi->oc.ods[0]));
635
636 /* create sysfs subdir under which we put the device table
637 * And cluster layout. A Superblock is identified by the string:
638 * "dev[0].osdname"_"pid"
639 */
640 exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]);
641
642 for (i = 0; i < numdevs; i++) {
643 struct exofs_fscb fscb;
644 struct osd_dev_info odi;
645 struct osd_dev *od;
646
647 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
648 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
649 ret = -EINVAL;
650 goto out;
651 }
652
653 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
654 i, odi.osdname);
655
656 /* the exofs id is currently the table index */
657 eds[i].did = i;
658
659 /* On all devices the device table is identical. The user can
660 * specify any one of the participating devices on the command
661 * line. We always keep them in device-table order.
662 */
663 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
664 eds[i].ored.od = fscb_od;
665 ++sbi->oc.numdevs;
666 fscb_od = NULL;
667 exofs_sysfs_odev_add(&eds[i], sbi);
668 continue;
669 }
670
671 od = osduld_info_lookup(&odi);
672 if (IS_ERR(od)) {
673 ret = PTR_ERR(od);
674 EXOFS_ERR("ERROR: device requested is not found "
675 "osd_name-%s =>%d\n", odi.osdname, ret);
676 goto out;
677 }
678
679 eds[i].ored.od = od;
680 ++sbi->oc.numdevs;
681
682 /* Read the fscb of the other devices to make sure the FS
683 * partition is there.
684 */
685 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
686 sizeof(fscb));
687 if (unlikely(ret)) {
688 EXOFS_ERR("ERROR: Malformed participating device "
689 "error reading fscb osd_name-%s\n",
690 odi.osdname);
691 goto out;
692 }
693 exofs_sysfs_odev_add(&eds[i], sbi);
694
695 /* TODO: verify other information is correct and FS-uuid
696 * matches. Benny what did you say about device table
697 * generation and old devices?
698 */
699 }
700
701out:
702 kfree(dt);
703 if (unlikely(fscb_od && !ret)) {
704 EXOFS_ERR("ERROR: Bad device-table container device not present\n");
705 osduld_put_device(fscb_od);
706 return -EINVAL;
707 }
708 return ret;
709}
710
711/*
712 * Read the superblock from the OSD and fill in the fields
713 */
714static int exofs_fill_super(struct super_block *sb, void *data, int silent)
715{
716 struct inode *root;
717 struct exofs_mountopt *opts = data;
718 struct exofs_sb_info *sbi; /*extended info */
719 struct osd_dev *od; /* Master device */
720 struct exofs_fscb fscb; /*on-disk superblock info */
721 struct ore_comp comp;
722 unsigned table_count;
723 int ret;
724
725 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
726 if (!sbi)
727 return -ENOMEM;
728
729 /* use mount options to fill superblock */
730 if (opts->is_osdname) {
731 struct osd_dev_info odi = {.systemid_len = 0};
732
733 odi.osdname_len = strlen(opts->dev_name);
734 odi.osdname = (u8 *)opts->dev_name;
735 od = osduld_info_lookup(&odi);
736 kfree(opts->dev_name);
737 opts->dev_name = NULL;
738 } else {
739 od = osduld_path_lookup(opts->dev_name);
740 }
741 if (IS_ERR(od)) {
742 ret = -EINVAL;
743 goto free_sbi;
744 }
745
746 /* Default layout in case we do not have a device-table */
747 sbi->layout.stripe_unit = PAGE_SIZE;
748 sbi->layout.mirrors_p1 = 1;
749 sbi->layout.group_width = 1;
750 sbi->layout.group_depth = -1;
751 sbi->layout.group_count = 1;
752 sbi->s_timeout = opts->timeout;
753
754 sbi->one_comp.obj.partition = opts->pid;
755 sbi->one_comp.obj.id = 0;
756 exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
757 sbi->oc.single_comp = EC_SINGLE_COMP;
758 sbi->oc.comps = &sbi->one_comp;
759
760 /* fill in some other data by hand */
761 memset(sb->s_id, 0, sizeof(sb->s_id));
762 strcpy(sb->s_id, "exofs");
763 sb->s_blocksize = EXOFS_BLKSIZE;
764 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
765 sb->s_maxbytes = MAX_LFS_FILESIZE;
766 sb->s_max_links = EXOFS_LINK_MAX;
767 atomic_set(&sbi->s_curr_pending, 0);
768 sb->s_bdev = NULL;
769 sb->s_dev = 0;
770
771 comp.obj.partition = sbi->one_comp.obj.partition;
772 comp.obj.id = EXOFS_SUPER_ID;
773 exofs_make_credential(comp.cred, &comp.obj);
774
775 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
776 if (unlikely(ret))
777 goto free_sbi;
778
779 sb->s_magic = le16_to_cpu(fscb.s_magic);
780 /* NOTE: we read below to be backward compatible with old versions */
781 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
782 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
783
784 /* make sure what we read from the object store is correct */
785 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
786 if (!silent)
787 EXOFS_ERR("ERROR: Bad magic value\n");
788 ret = -EINVAL;
789 goto free_sbi;
790 }
791 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
792 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
793 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
794 ret = -EINVAL;
795 goto free_sbi;
796 }
797
798 /* start generation numbers from a random point */
799 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
800 spin_lock_init(&sbi->s_next_gen_lock);
801
802 table_count = le64_to_cpu(fscb.s_dev_table_count);
803 if (table_count) {
804 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
805 if (unlikely(ret))
806 goto free_sbi;
807 } else {
808 struct exofs_dev *eds;
809
810 ret = __alloc_dev_table(sbi, 1, &eds);
811 if (unlikely(ret))
812 goto free_sbi;
813
814 ore_comp_set_dev(&sbi->oc, 0, od);
815 sbi->oc.numdevs = 1;
816 }
817
818 __sbi_read_stats(sbi);
819
820 /* set up operation vectors */
821 sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
822 sb->s_bdi = &sbi->bdi;
823 sb->s_fs_info = sbi;
824 sb->s_op = &exofs_sops;
825 sb->s_export_op = &exofs_export_ops;
826 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
827 if (IS_ERR(root)) {
828 EXOFS_ERR("ERROR: exofs_iget failed\n");
829 ret = PTR_ERR(root);
830 goto free_sbi;
831 }
832 sb->s_root = d_make_root(root);
833 if (!sb->s_root) {
834 EXOFS_ERR("ERROR: get root inode failed\n");
835 ret = -ENOMEM;
836 goto free_sbi;
837 }
838
839 if (!S_ISDIR(root->i_mode)) {
840 dput(sb->s_root);
841 sb->s_root = NULL;
842 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
843 root->i_mode);
844 ret = -EINVAL;
845 goto free_sbi;
846 }
847
848 ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
849 if (ret) {
850 EXOFS_DBGMSG("Failed to bdi_setup_and_register\n");
851 dput(sb->s_root);
852 sb->s_root = NULL;
853 goto free_sbi;
854 }
855
856 exofs_sysfs_dbg_print();
857 _exofs_print_device("Mounting", opts->dev_name,
858 ore_comp_dev(&sbi->oc, 0),
859 sbi->one_comp.obj.partition);
860 return 0;
861
862free_sbi:
863 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
864 opts->dev_name, sbi->one_comp.obj.partition, ret);
865 exofs_free_sbi(sbi);
866 return ret;
867}
868
869/*
870 * Set up the superblock (calls exofs_fill_super eventually)
871 */
872static struct dentry *exofs_mount(struct file_system_type *type,
873 int flags, const char *dev_name,
874 void *data)
875{
876 struct exofs_mountopt opts;
877 int ret;
878
879 ret = parse_options(data, &opts);
880 if (ret)
881 return ERR_PTR(ret);
882
883 if (!opts.dev_name)
884 opts.dev_name = dev_name;
885 return mount_nodev(type, flags, &opts, exofs_fill_super);
886}
887
888/*
889 * Return information about the file system state in the buffer. This is used
890 * by the 'df' command, for example.
891 */
892static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
893{
894 struct super_block *sb = dentry->d_sb;
895 struct exofs_sb_info *sbi = sb->s_fs_info;
896 struct ore_io_state *ios;
897 struct osd_attr attrs[] = {
898 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
899 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
900 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
901 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
902 };
903 uint64_t capacity = ULLONG_MAX;
904 uint64_t used = ULLONG_MAX;
905 int ret;
906
907 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
908 if (ret) {
909 EXOFS_DBGMSG("ore_get_io_state failed.\n");
910 return ret;
911 }
912
913 ios->in_attr = attrs;
914 ios->in_attr_len = ARRAY_SIZE(attrs);
915
916 ret = ore_read(ios);
917 if (unlikely(ret))
918 goto out;
919
920 ret = extract_attr_from_ios(ios, &attrs[0]);
921 if (likely(!ret)) {
922 capacity = get_unaligned_be64(attrs[0].val_ptr);
923 if (unlikely(!capacity))
924 capacity = ULLONG_MAX;
925 } else
926 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
927
928 ret = extract_attr_from_ios(ios, &attrs[1]);
929 if (likely(!ret))
930 used = get_unaligned_be64(attrs[1].val_ptr);
931 else
932 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
933
934 /* fill in the stats buffer */
935 buf->f_type = EXOFS_SUPER_MAGIC;
936 buf->f_bsize = EXOFS_BLKSIZE;
937 buf->f_blocks = capacity >> 9;
938 buf->f_bfree = (capacity - used) >> 9;
939 buf->f_bavail = buf->f_bfree;
940 buf->f_files = sbi->s_numfiles;
941 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
942 buf->f_namelen = EXOFS_NAME_LEN;
943
944out:
945 ore_put_io_state(ios);
946 return ret;
947}
948
949static const struct super_operations exofs_sops = {
950 .alloc_inode = exofs_alloc_inode,
951 .destroy_inode = exofs_destroy_inode,
952 .write_inode = exofs_write_inode,
953 .evict_inode = exofs_evict_inode,
954 .put_super = exofs_put_super,
955 .write_super = exofs_write_super,
956 .sync_fs = exofs_sync_fs,
957 .statfs = exofs_statfs,
958};
959
960/******************************************************************************
961 * EXPORT OPERATIONS
962 *****************************************************************************/
963
964static struct dentry *exofs_get_parent(struct dentry *child)
965{
966 unsigned long ino = exofs_parent_ino(child);
967
968 if (!ino)
969 return ERR_PTR(-ESTALE);
970
971 return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
972}
973
974static struct inode *exofs_nfs_get_inode(struct super_block *sb,
975 u64 ino, u32 generation)
976{
977 struct inode *inode;
978
979 inode = exofs_iget(sb, ino);
980 if (IS_ERR(inode))
981 return ERR_CAST(inode);
982 if (generation && inode->i_generation != generation) {
983 /* we didn't find the right inode.. */
984 iput(inode);
985 return ERR_PTR(-ESTALE);
986 }
987 return inode;
988}
989
990static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
991 struct fid *fid, int fh_len, int fh_type)
992{
993 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
994 exofs_nfs_get_inode);
995}
996
997static struct dentry *exofs_fh_to_parent(struct super_block *sb,
998 struct fid *fid, int fh_len, int fh_type)
999{
1000 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1001 exofs_nfs_get_inode);
1002}
1003
1004static const struct export_operations exofs_export_ops = {
1005 .fh_to_dentry = exofs_fh_to_dentry,
1006 .fh_to_parent = exofs_fh_to_parent,
1007 .get_parent = exofs_get_parent,
1008};
1009
1010/******************************************************************************
1011 * INSMOD/RMMOD
1012 *****************************************************************************/
1013
1014/*
1015 * struct that describes this file system
1016 */
1017static struct file_system_type exofs_type = {
1018 .owner = THIS_MODULE,
1019 .name = "exofs",
1020 .mount = exofs_mount,
1021 .kill_sb = generic_shutdown_super,
1022};
1023
1024static int __init init_exofs(void)
1025{
1026 int err;
1027
1028 err = init_inodecache();
1029 if (err)
1030 goto out;
1031
1032 err = register_filesystem(&exofs_type);
1033 if (err)
1034 goto out_d;
1035
1036 /* We don't fail if sysfs creation failed */
1037 exofs_sysfs_init();
1038
1039 return 0;
1040out_d:
1041 destroy_inodecache();
1042out:
1043 return err;
1044}
1045
1046static void __exit exit_exofs(void)
1047{
1048 exofs_sysfs_uninit();
1049 unregister_filesystem(&exofs_type);
1050 destroy_inodecache();
1051}
1052
1053MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
1054MODULE_DESCRIPTION("exofs");
1055MODULE_LICENSE("GPL");
1056
1057module_init(init_exofs)
1058module_exit(exit_exofs)