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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / exofs / super.c
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 */
53 struct exofs_mountopt {
54 bool is_osdname;
55 const char *dev_name;
56 uint64_t pid;
57 int timeout;
58 };
59
60 /*
61 * exofs-specific mount-time options.
62 */
63 enum { Opt_name, Opt_pid, Opt_to, Opt_err };
64
65 /*
66 * Our mount-time options. These should ideally be 64-bit unsigned, but the
67 * kernel's parsing functions do not currently support that. 32-bit should be
68 * sufficient for most applications now.
69 */
70 static match_table_t tokens = {
71 {Opt_name, "osdname=%s"},
72 {Opt_pid, "pid=%u"},
73 {Opt_to, "to=%u"},
74 {Opt_err, NULL}
75 };
76
77 /*
78 * The main option parsing method. Also makes sure that all of the mandatory
79 * mount options were set.
80 */
81 static int parse_options(char *options, struct exofs_mountopt *opts)
82 {
83 char *p;
84 substring_t args[MAX_OPT_ARGS];
85 int option;
86 bool s_pid = false;
87
88 EXOFS_DBGMSG("parse_options %s\n", options);
89 /* defaults */
90 memset(opts, 0, sizeof(*opts));
91 opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
92
93 while ((p = strsep(&options, ",")) != NULL) {
94 int token;
95 char str[32];
96
97 if (!*p)
98 continue;
99
100 token = match_token(p, tokens, args);
101 switch (token) {
102 case Opt_name:
103 opts->dev_name = match_strdup(&args[0]);
104 if (unlikely(!opts->dev_name)) {
105 EXOFS_ERR("Error allocating dev_name");
106 return -ENOMEM;
107 }
108 opts->is_osdname = true;
109 break;
110 case Opt_pid:
111 if (0 == match_strlcpy(str, &args[0], sizeof(str)))
112 return -EINVAL;
113 opts->pid = simple_strtoull(str, NULL, 0);
114 if (opts->pid < EXOFS_MIN_PID) {
115 EXOFS_ERR("Partition ID must be >= %u",
116 EXOFS_MIN_PID);
117 return -EINVAL;
118 }
119 s_pid = 1;
120 break;
121 case Opt_to:
122 if (match_int(&args[0], &option))
123 return -EINVAL;
124 if (option <= 0) {
125 EXOFS_ERR("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 */
149 static struct kmem_cache *exofs_inode_cachep;
150
151 /*
152 * Allocate an inode in the cache
153 */
154 static struct inode *exofs_alloc_inode(struct super_block *sb)
155 {
156 struct exofs_i_info *oi;
157
158 oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
159 if (!oi)
160 return NULL;
161
162 oi->vfs_inode.i_version = 1;
163 return &oi->vfs_inode;
164 }
165
166 static void exofs_i_callback(struct rcu_head *head)
167 {
168 struct inode *inode = container_of(head, struct inode, i_rcu);
169 kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
170 }
171
172 /*
173 * Remove an inode from the cache
174 */
175 static void exofs_destroy_inode(struct inode *inode)
176 {
177 call_rcu(&inode->i_rcu, exofs_i_callback);
178 }
179
180 /*
181 * Initialize the inode
182 */
183 static void exofs_init_once(void *foo)
184 {
185 struct exofs_i_info *oi = foo;
186
187 inode_init_once(&oi->vfs_inode);
188 }
189
190 /*
191 * Create and initialize the inode cache
192 */
193 static int init_inodecache(void)
194 {
195 exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
196 sizeof(struct exofs_i_info), 0,
197 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
198 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->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
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->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 *****************************************************************************/
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 static 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
404
405 unlock_super(sb);
406 out:
407 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
408 ore_put_io_state(ios);
409 kfree(fscb);
410 return ret;
411 }
412
413 static void _exofs_print_device(const char *msg, const char *dev_path,
414 struct osd_dev *od, u64 pid)
415 {
416 const struct osd_dev_info *odi = osduld_device_info(od);
417
418 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
419 msg, dev_path ?: "", odi->osdname, _LLU(pid));
420 }
421
422 static void exofs_free_sbi(struct exofs_sb_info *sbi)
423 {
424 unsigned numdevs = sbi->oc.numdevs;
425
426 while (numdevs) {
427 unsigned i = --numdevs;
428 struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
429
430 if (od) {
431 ore_comp_set_dev(&sbi->oc, i, NULL);
432 osduld_put_device(od);
433 }
434 }
435 kfree(sbi->oc.ods);
436 kfree(sbi);
437 }
438
439 /*
440 * This function is called when the vfs is freeing the superblock. We just
441 * need to free our own part.
442 */
443 static void exofs_put_super(struct super_block *sb)
444 {
445 int num_pend;
446 struct exofs_sb_info *sbi = sb->s_fs_info;
447
448 /* make sure there are no pending commands */
449 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
450 num_pend = atomic_read(&sbi->s_curr_pending)) {
451 wait_queue_head_t wq;
452
453 printk(KERN_NOTICE "%s: !!Pending operations in flight. "
454 "This is a BUG. please report to osd-dev@open-osd.org\n",
455 __func__);
456 init_waitqueue_head(&wq);
457 wait_event_timeout(wq,
458 (atomic_read(&sbi->s_curr_pending) == 0),
459 msecs_to_jiffies(100));
460 }
461
462 _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
463 sbi->one_comp.obj.partition);
464
465 exofs_sysfs_sb_del(sbi);
466 bdi_destroy(&sbi->bdi);
467 exofs_free_sbi(sbi);
468 sb->s_fs_info = NULL;
469 }
470
471 static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
472 struct exofs_device_table *dt)
473 {
474 int ret;
475
476 sbi->layout.stripe_unit =
477 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
478 sbi->layout.group_width =
479 le32_to_cpu(dt->dt_data_map.cb_group_width);
480 sbi->layout.group_depth =
481 le32_to_cpu(dt->dt_data_map.cb_group_depth);
482 sbi->layout.mirrors_p1 =
483 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;
484 sbi->layout.raid_algorithm =
485 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
486
487 ret = ore_verify_layout(numdevs, &sbi->layout);
488
489 EXOFS_DBGMSG("exofs: layout: "
490 "num_comps=%u stripe_unit=0x%x group_width=%u "
491 "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n",
492 numdevs,
493 sbi->layout.stripe_unit,
494 sbi->layout.group_width,
495 _LLU(sbi->layout.group_depth),
496 sbi->layout.mirrors_p1,
497 sbi->layout.raid_algorithm);
498 return ret;
499 }
500
501 static unsigned __ra_pages(struct ore_layout *layout)
502 {
503 const unsigned _MIN_RA = 32; /* min 128K read-ahead */
504 unsigned ra_pages = layout->group_width * layout->stripe_unit /
505 PAGE_SIZE;
506 unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
507
508 ra_pages *= 2; /* two stripes */
509 if (ra_pages < _MIN_RA)
510 ra_pages = roundup(_MIN_RA, ra_pages / 2);
511
512 if (ra_pages > max_io_pages)
513 ra_pages = max_io_pages;
514
515 return ra_pages;
516 }
517
518 /* @odi is valid only as long as @fscb_dev is valid */
519 static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
520 struct osd_dev_info *odi)
521 {
522 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
523 if (likely(odi->systemid_len))
524 memcpy(odi->systemid, dt_dev->systemid, OSD_SYSTEMID_LEN);
525
526 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
527 odi->osdname = dt_dev->osdname;
528
529 /* FIXME support long names. Will need a _put function */
530 if (dt_dev->long_name_offset)
531 return -EINVAL;
532
533 /* Make sure osdname is printable!
534 * mkexofs should give us space for a null-terminator else the
535 * device-table is invalid.
536 */
537 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
538 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
539 dt_dev->osdname[odi->osdname_len] = 0;
540
541 /* If it's all zeros something is bad we read past end-of-obj */
542 return !(odi->systemid_len || odi->osdname_len);
543 }
544
545 int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
546 struct exofs_dev **peds)
547 {
548 struct __alloc_ore_devs_and_exofs_devs {
549 /* Twice bigger table: See exofs_init_comps() and comment at
550 * exofs_read_lookup_dev_table()
551 */
552 struct ore_dev *oreds[numdevs * 2 - 1];
553 struct exofs_dev eds[numdevs];
554 } *aoded;
555 struct exofs_dev *eds;
556 unsigned i;
557
558 aoded = kzalloc(sizeof(*aoded), GFP_KERNEL);
559 if (unlikely(!aoded)) {
560 EXOFS_ERR("ERROR: failed allocating Device array[%d]\n",
561 numdevs);
562 return -ENOMEM;
563 }
564
565 sbi->oc.ods = aoded->oreds;
566 *peds = eds = aoded->eds;
567 for (i = 0; i < numdevs; ++i)
568 aoded->oreds[i] = &eds[i].ored;
569 return 0;
570 }
571
572 static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
573 struct osd_dev *fscb_od,
574 unsigned table_count)
575 {
576 struct ore_comp comp;
577 struct exofs_device_table *dt;
578 struct exofs_dev *eds;
579 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
580 sizeof(*dt);
581 unsigned numdevs, i;
582 int ret;
583
584 dt = kmalloc(table_bytes, GFP_KERNEL);
585 if (unlikely(!dt)) {
586 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
587 table_bytes);
588 return -ENOMEM;
589 }
590
591 sbi->oc.numdevs = 0;
592
593 comp.obj.partition = sbi->one_comp.obj.partition;
594 comp.obj.id = EXOFS_DEVTABLE_ID;
595 exofs_make_credential(comp.cred, &comp.obj);
596
597 ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt,
598 table_bytes);
599 if (unlikely(ret)) {
600 EXOFS_ERR("ERROR: reading device table\n");
601 goto out;
602 }
603
604 numdevs = le64_to_cpu(dt->dt_num_devices);
605 if (unlikely(!numdevs)) {
606 ret = -EINVAL;
607 goto out;
608 }
609 WARN_ON(table_count != numdevs);
610
611 ret = _read_and_match_data_map(sbi, numdevs, dt);
612 if (unlikely(ret))
613 goto out;
614
615 ret = __alloc_dev_table(sbi, numdevs, &eds);
616 if (unlikely(ret))
617 goto out;
618 /* exofs round-robins the device table view according to inode
619 * number. We hold a: twice bigger table hence inodes can point
620 * to any device and have a sequential view of the table
621 * starting at this device. See exofs_init_comps()
622 */
623 memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
624 (numdevs - 1) * sizeof(sbi->oc.ods[0]));
625
626 /* create sysfs subdir under which we put the device table
627 * And cluster layout. A Superblock is identified by the string:
628 * "dev[0].osdname"_"pid"
629 */
630 exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]);
631
632 for (i = 0; i < numdevs; i++) {
633 struct exofs_fscb fscb;
634 struct osd_dev_info odi;
635 struct osd_dev *od;
636
637 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
638 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
639 ret = -EINVAL;
640 goto out;
641 }
642
643 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
644 i, odi.osdname);
645
646 /* the exofs id is currently the table index */
647 eds[i].did = i;
648
649 /* On all devices the device table is identical. The user can
650 * specify any one of the participating devices on the command
651 * line. We always keep them in device-table order.
652 */
653 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
654 eds[i].ored.od = fscb_od;
655 ++sbi->oc.numdevs;
656 fscb_od = NULL;
657 exofs_sysfs_odev_add(&eds[i], sbi);
658 continue;
659 }
660
661 od = osduld_info_lookup(&odi);
662 if (IS_ERR(od)) {
663 ret = PTR_ERR(od);
664 EXOFS_ERR("ERROR: device requested is not found "
665 "osd_name-%s =>%d\n", odi.osdname, ret);
666 goto out;
667 }
668
669 eds[i].ored.od = od;
670 ++sbi->oc.numdevs;
671
672 /* Read the fscb of the other devices to make sure the FS
673 * partition is there.
674 */
675 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
676 sizeof(fscb));
677 if (unlikely(ret)) {
678 EXOFS_ERR("ERROR: Malformed participating device "
679 "error reading fscb osd_name-%s\n",
680 odi.osdname);
681 goto out;
682 }
683 exofs_sysfs_odev_add(&eds[i], sbi);
684
685 /* TODO: verify other information is correct and FS-uuid
686 * matches. Benny what did you say about device table
687 * generation and old devices?
688 */
689 }
690
691 out:
692 kfree(dt);
693 if (unlikely(fscb_od && !ret)) {
694 EXOFS_ERR("ERROR: Bad device-table container device not present\n");
695 osduld_put_device(fscb_od);
696 return -EINVAL;
697 }
698 return ret;
699 }
700
701 /*
702 * Read the superblock from the OSD and fill in the fields
703 */
704 static int exofs_fill_super(struct super_block *sb, void *data, int silent)
705 {
706 struct inode *root;
707 struct exofs_mountopt *opts = data;
708 struct exofs_sb_info *sbi; /*extended info */
709 struct osd_dev *od; /* Master device */
710 struct exofs_fscb fscb; /*on-disk superblock info */
711 struct ore_comp comp;
712 unsigned table_count;
713 int ret;
714
715 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
716 if (!sbi)
717 return -ENOMEM;
718
719 /* use mount options to fill superblock */
720 if (opts->is_osdname) {
721 struct osd_dev_info odi = {.systemid_len = 0};
722
723 odi.osdname_len = strlen(opts->dev_name);
724 odi.osdname = (u8 *)opts->dev_name;
725 od = osduld_info_lookup(&odi);
726 kfree(opts->dev_name);
727 opts->dev_name = NULL;
728 } else {
729 od = osduld_path_lookup(opts->dev_name);
730 }
731 if (IS_ERR(od)) {
732 ret = -EINVAL;
733 goto free_sbi;
734 }
735
736 /* Default layout in case we do not have a device-table */
737 sbi->layout.stripe_unit = PAGE_SIZE;
738 sbi->layout.mirrors_p1 = 1;
739 sbi->layout.group_width = 1;
740 sbi->layout.group_depth = -1;
741 sbi->layout.group_count = 1;
742 sbi->s_timeout = opts->timeout;
743
744 sbi->one_comp.obj.partition = opts->pid;
745 sbi->one_comp.obj.id = 0;
746 exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
747 sbi->oc.single_comp = EC_SINGLE_COMP;
748 sbi->oc.comps = &sbi->one_comp;
749
750 /* fill in some other data by hand */
751 memset(sb->s_id, 0, sizeof(sb->s_id));
752 strcpy(sb->s_id, "exofs");
753 sb->s_blocksize = EXOFS_BLKSIZE;
754 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
755 sb->s_maxbytes = MAX_LFS_FILESIZE;
756 sb->s_max_links = EXOFS_LINK_MAX;
757 atomic_set(&sbi->s_curr_pending, 0);
758 sb->s_bdev = NULL;
759 sb->s_dev = 0;
760
761 comp.obj.partition = sbi->one_comp.obj.partition;
762 comp.obj.id = EXOFS_SUPER_ID;
763 exofs_make_credential(comp.cred, &comp.obj);
764
765 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
766 if (unlikely(ret))
767 goto free_sbi;
768
769 sb->s_magic = le16_to_cpu(fscb.s_magic);
770 /* NOTE: we read below to be backward compatible with old versions */
771 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
772 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
773
774 /* make sure what we read from the object store is correct */
775 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
776 if (!silent)
777 EXOFS_ERR("ERROR: Bad magic value\n");
778 ret = -EINVAL;
779 goto free_sbi;
780 }
781 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
782 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
783 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
784 ret = -EINVAL;
785 goto free_sbi;
786 }
787
788 /* start generation numbers from a random point */
789 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
790 spin_lock_init(&sbi->s_next_gen_lock);
791
792 table_count = le64_to_cpu(fscb.s_dev_table_count);
793 if (table_count) {
794 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
795 if (unlikely(ret))
796 goto free_sbi;
797 } else {
798 struct exofs_dev *eds;
799
800 ret = __alloc_dev_table(sbi, 1, &eds);
801 if (unlikely(ret))
802 goto free_sbi;
803
804 ore_comp_set_dev(&sbi->oc, 0, od);
805 sbi->oc.numdevs = 1;
806 }
807
808 __sbi_read_stats(sbi);
809
810 /* set up operation vectors */
811 sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
812 sb->s_bdi = &sbi->bdi;
813 sb->s_fs_info = sbi;
814 sb->s_op = &exofs_sops;
815 sb->s_export_op = &exofs_export_ops;
816 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
817 if (IS_ERR(root)) {
818 EXOFS_ERR("ERROR: exofs_iget failed\n");
819 ret = PTR_ERR(root);
820 goto free_sbi;
821 }
822 sb->s_root = d_make_root(root);
823 if (!sb->s_root) {
824 EXOFS_ERR("ERROR: get root inode failed\n");
825 ret = -ENOMEM;
826 goto free_sbi;
827 }
828
829 if (!S_ISDIR(root->i_mode)) {
830 dput(sb->s_root);
831 sb->s_root = NULL;
832 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
833 root->i_mode);
834 ret = -EINVAL;
835 goto free_sbi;
836 }
837
838 ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
839 if (ret) {
840 EXOFS_DBGMSG("Failed to bdi_setup_and_register\n");
841 dput(sb->s_root);
842 sb->s_root = NULL;
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
852 free_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 */
862 static 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 */
882 static 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
934 out:
935 ore_put_io_state(ios);
936 return ret;
937 }
938
939 static 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
953 static 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_inode->i_sb, ino));
961 }
962
963 static 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
979 static 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
986 static 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
993 static 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 */
1006 static struct file_system_type exofs_type = {
1007 .owner = THIS_MODULE,
1008 .name = "exofs",
1009 .mount = exofs_mount,
1010 .kill_sb = generic_shutdown_super,
1011 };
1012
1013 static int __init init_exofs(void)
1014 {
1015 int err;
1016
1017 err = init_inodecache();
1018 if (err)
1019 goto out;
1020
1021 err = register_filesystem(&exofs_type);
1022 if (err)
1023 goto out_d;
1024
1025 /* We don't fail if sysfs creation failed */
1026 exofs_sysfs_init();
1027
1028 return 0;
1029 out_d:
1030 destroy_inodecache();
1031 out:
1032 return err;
1033 }
1034
1035 static void __exit exit_exofs(void)
1036 {
1037 exofs_sysfs_uninit();
1038 unregister_filesystem(&exofs_type);
1039 destroy_inodecache();
1040 }
1041
1042 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
1043 MODULE_DESCRIPTION("exofs");
1044 MODULE_LICENSE("GPL");
1045
1046 module_init(init_exofs)
1047 module_exit(exit_exofs)
kernel source for telekom puls (alcatel/mediatek)