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 */
54 struct 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 */
64 enum { 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 */
71 static 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 */
parse_options(char * options,struct exofs_mountopt * opts)82 static 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 */
150 static struct kmem_cache *exofs_inode_cachep;
151
152 /*
153 * Allocate an inode in the cache
154 */
exofs_alloc_inode(struct super_block * sb)155 static 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
exofs_i_callback(struct rcu_head * head)167 static 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 */
exofs_destroy_inode(struct inode * inode)176 static 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 */
exofs_init_once(void * foo)184 static 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 */
init_inodecache(void)194 static 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 */
destroy_inodecache(void)211 static 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 *****************************************************************************/
exofs_make_credential(u8 cred_a[OSD_CAP_LEN],const struct osd_obj_id * obj)224 void 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
exofs_read_kern(struct osd_dev * od,u8 * cred,struct osd_obj_id * obj,u64 offset,void * p,unsigned length)229 static 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);
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
257 out:
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
265 static 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
__sbi_read_stats(struct exofs_sb_info * sbi)270 static 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
313 out:
314 ore_put_io_state(ios);
315 return ret;
316 }
317
stats_done(struct ore_io_state * ios,void * p)318 static 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 */
exofs_sbi_write_stats(struct exofs_sb_info * sbi)325 int 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 *****************************************************************************/
361 static const struct super_operations exofs_sops;
362 static const struct export_operations exofs_export_ops;
363
364 /*
365 * Write the superblock to the OSD
366 */
exofs_sync_fs(struct super_block * sb,int wait)367 static 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
411 out:
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
_exofs_print_device(const char * msg,const char * dev_path,struct osd_dev * od,u64 pid)418 static 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
exofs_free_sbi(struct exofs_sb_info * sbi)427 static 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 */
exofs_put_super(struct super_block * sb)448 static 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
_read_and_match_data_map(struct exofs_sb_info * sbi,unsigned numdevs,struct exofs_device_table * dt)475 static 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
__ra_pages(struct ore_layout * layout)505 static 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 */
exofs_devs_2_odi(struct exofs_dt_device_info * dt_dev,struct osd_dev_info * odi)523 static 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
__alloc_dev_table(struct exofs_sb_info * sbi,unsigned numdevs,struct exofs_dev ** peds)549 static int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
550 struct exofs_dev **peds)
551 {
552 /* Twice bigger table: See exofs_init_comps() and comment at
553 * exofs_read_lookup_dev_table()
554 */
555 const size_t numores = numdevs * 2 - 1;
556 struct exofs_dev *eds;
557 unsigned i;
558
559 sbi->oc.ods = kzalloc(numores * sizeof(struct ore_dev *) +
560 numdevs * sizeof(struct exofs_dev), GFP_KERNEL);
561 if (unlikely(!sbi->oc.ods)) {
562 EXOFS_ERR("ERROR: failed allocating Device array[%d]\n",
563 numdevs);
564 return -ENOMEM;
565 }
566
567 /* Start of allocated struct exofs_dev entries */
568 *peds = eds = (void *)sbi->oc.ods[numores];
569 /* Initialize pointers into struct exofs_dev */
570 for (i = 0; i < numdevs; ++i)
571 sbi->oc.ods[i] = &eds[i].ored;
572 return 0;
573 }
574
exofs_read_lookup_dev_table(struct exofs_sb_info * sbi,struct osd_dev * fscb_od,unsigned table_count)575 static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
576 struct osd_dev *fscb_od,
577 unsigned table_count)
578 {
579 struct ore_comp comp;
580 struct exofs_device_table *dt;
581 struct exofs_dev *eds;
582 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
583 sizeof(*dt);
584 unsigned numdevs, i;
585 int ret;
586
587 dt = kmalloc(table_bytes, GFP_KERNEL);
588 if (unlikely(!dt)) {
589 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
590 table_bytes);
591 return -ENOMEM;
592 }
593
594 sbi->oc.numdevs = 0;
595
596 comp.obj.partition = sbi->one_comp.obj.partition;
597 comp.obj.id = EXOFS_DEVTABLE_ID;
598 exofs_make_credential(comp.cred, &comp.obj);
599
600 ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt,
601 table_bytes);
602 if (unlikely(ret)) {
603 EXOFS_ERR("ERROR: reading device table\n");
604 goto out;
605 }
606
607 numdevs = le64_to_cpu(dt->dt_num_devices);
608 if (unlikely(!numdevs)) {
609 ret = -EINVAL;
610 goto out;
611 }
612 WARN_ON(table_count != numdevs);
613
614 ret = _read_and_match_data_map(sbi, numdevs, dt);
615 if (unlikely(ret))
616 goto out;
617
618 ret = __alloc_dev_table(sbi, numdevs, &eds);
619 if (unlikely(ret))
620 goto out;
621 /* exofs round-robins the device table view according to inode
622 * number. We hold a: twice bigger table hence inodes can point
623 * to any device and have a sequential view of the table
624 * starting at this device. See exofs_init_comps()
625 */
626 memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
627 (numdevs - 1) * sizeof(sbi->oc.ods[0]));
628
629 /* create sysfs subdir under which we put the device table
630 * And cluster layout. A Superblock is identified by the string:
631 * "dev[0].osdname"_"pid"
632 */
633 exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]);
634
635 for (i = 0; i < numdevs; i++) {
636 struct exofs_fscb fscb;
637 struct osd_dev_info odi;
638 struct osd_dev *od;
639
640 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
641 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
642 ret = -EINVAL;
643 goto out;
644 }
645
646 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
647 i, odi.osdname);
648
649 /* the exofs id is currently the table index */
650 eds[i].did = i;
651
652 /* On all devices the device table is identical. The user can
653 * specify any one of the participating devices on the command
654 * line. We always keep them in device-table order.
655 */
656 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
657 eds[i].ored.od = fscb_od;
658 ++sbi->oc.numdevs;
659 fscb_od = NULL;
660 exofs_sysfs_odev_add(&eds[i], sbi);
661 continue;
662 }
663
664 od = osduld_info_lookup(&odi);
665 if (IS_ERR(od)) {
666 ret = PTR_ERR(od);
667 EXOFS_ERR("ERROR: device requested is not found "
668 "osd_name-%s =>%d\n", odi.osdname, ret);
669 goto out;
670 }
671
672 eds[i].ored.od = od;
673 ++sbi->oc.numdevs;
674
675 /* Read the fscb of the other devices to make sure the FS
676 * partition is there.
677 */
678 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
679 sizeof(fscb));
680 if (unlikely(ret)) {
681 EXOFS_ERR("ERROR: Malformed participating device "
682 "error reading fscb osd_name-%s\n",
683 odi.osdname);
684 goto out;
685 }
686 exofs_sysfs_odev_add(&eds[i], sbi);
687
688 /* TODO: verify other information is correct and FS-uuid
689 * matches. Benny what did you say about device table
690 * generation and old devices?
691 */
692 }
693
694 out:
695 kfree(dt);
696 if (unlikely(fscb_od && !ret)) {
697 EXOFS_ERR("ERROR: Bad device-table container device not present\n");
698 osduld_put_device(fscb_od);
699 return -EINVAL;
700 }
701 return ret;
702 }
703
704 /*
705 * Read the superblock from the OSD and fill in the fields
706 */
exofs_fill_super(struct super_block * sb,void * data,int silent)707 static int exofs_fill_super(struct super_block *sb, void *data, int silent)
708 {
709 struct inode *root;
710 struct exofs_mountopt *opts = data;
711 struct exofs_sb_info *sbi; /*extended info */
712 struct osd_dev *od; /* Master device */
713 struct exofs_fscb fscb; /*on-disk superblock info */
714 struct ore_comp comp;
715 unsigned table_count;
716 int ret;
717
718 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
719 if (!sbi)
720 return -ENOMEM;
721
722 /* use mount options to fill superblock */
723 if (opts->is_osdname) {
724 struct osd_dev_info odi = {.systemid_len = 0};
725
726 odi.osdname_len = strlen(opts->dev_name);
727 odi.osdname = (u8 *)opts->dev_name;
728 od = osduld_info_lookup(&odi);
729 kfree(opts->dev_name);
730 opts->dev_name = NULL;
731 } else {
732 od = osduld_path_lookup(opts->dev_name);
733 }
734 if (IS_ERR(od)) {
735 ret = -EINVAL;
736 goto free_sbi;
737 }
738
739 /* Default layout in case we do not have a device-table */
740 sbi->layout.stripe_unit = PAGE_SIZE;
741 sbi->layout.mirrors_p1 = 1;
742 sbi->layout.group_width = 1;
743 sbi->layout.group_depth = -1;
744 sbi->layout.group_count = 1;
745 sbi->s_timeout = opts->timeout;
746
747 sbi->one_comp.obj.partition = opts->pid;
748 sbi->one_comp.obj.id = 0;
749 exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
750 sbi->oc.single_comp = EC_SINGLE_COMP;
751 sbi->oc.comps = &sbi->one_comp;
752
753 /* fill in some other data by hand */
754 memset(sb->s_id, 0, sizeof(sb->s_id));
755 strcpy(sb->s_id, "exofs");
756 sb->s_blocksize = EXOFS_BLKSIZE;
757 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
758 sb->s_maxbytes = MAX_LFS_FILESIZE;
759 sb->s_max_links = EXOFS_LINK_MAX;
760 atomic_set(&sbi->s_curr_pending, 0);
761 sb->s_bdev = NULL;
762 sb->s_dev = 0;
763
764 comp.obj.partition = sbi->one_comp.obj.partition;
765 comp.obj.id = EXOFS_SUPER_ID;
766 exofs_make_credential(comp.cred, &comp.obj);
767
768 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
769 if (unlikely(ret))
770 goto free_sbi;
771
772 sb->s_magic = le16_to_cpu(fscb.s_magic);
773 /* NOTE: we read below to be backward compatible with old versions */
774 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
775 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
776
777 /* make sure what we read from the object store is correct */
778 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
779 if (!silent)
780 EXOFS_ERR("ERROR: Bad magic value\n");
781 ret = -EINVAL;
782 goto free_sbi;
783 }
784 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
785 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
786 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
787 ret = -EINVAL;
788 goto free_sbi;
789 }
790
791 /* start generation numbers from a random point */
792 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
793 spin_lock_init(&sbi->s_next_gen_lock);
794
795 table_count = le64_to_cpu(fscb.s_dev_table_count);
796 if (table_count) {
797 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
798 if (unlikely(ret))
799 goto free_sbi;
800 } else {
801 struct exofs_dev *eds;
802
803 ret = __alloc_dev_table(sbi, 1, &eds);
804 if (unlikely(ret))
805 goto free_sbi;
806
807 ore_comp_set_dev(&sbi->oc, 0, od);
808 sbi->oc.numdevs = 1;
809 }
810
811 __sbi_read_stats(sbi);
812
813 /* set up operation vectors */
814 ret = super_setup_bdi(sb);
815 if (ret) {
816 EXOFS_DBGMSG("Failed to super_setup_bdi\n");
817 goto free_sbi;
818 }
819 sb->s_bdi->ra_pages = __ra_pages(&sbi->layout);
820 sb->s_fs_info = sbi;
821 sb->s_op = &exofs_sops;
822 sb->s_export_op = &exofs_export_ops;
823 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
824 if (IS_ERR(root)) {
825 EXOFS_ERR("ERROR: exofs_iget failed\n");
826 ret = PTR_ERR(root);
827 goto free_sbi;
828 }
829 sb->s_root = d_make_root(root);
830 if (!sb->s_root) {
831 EXOFS_ERR("ERROR: get root inode failed\n");
832 ret = -ENOMEM;
833 goto free_sbi;
834 }
835
836 if (!S_ISDIR(root->i_mode)) {
837 dput(sb->s_root);
838 sb->s_root = NULL;
839 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
840 root->i_mode);
841 ret = -EINVAL;
842 goto free_sbi;
843 }
844
845 exofs_sysfs_dbg_print();
846 _exofs_print_device("Mounting", opts->dev_name,
847 ore_comp_dev(&sbi->oc, 0),
848 sbi->one_comp.obj.partition);
849 return 0;
850
851 free_sbi:
852 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
853 opts->dev_name, sbi->one_comp.obj.partition, ret);
854 exofs_free_sbi(sbi);
855 return ret;
856 }
857
858 /*
859 * Set up the superblock (calls exofs_fill_super eventually)
860 */
exofs_mount(struct file_system_type * type,int flags,const char * dev_name,void * data)861 static struct dentry *exofs_mount(struct file_system_type *type,
862 int flags, const char *dev_name,
863 void *data)
864 {
865 struct exofs_mountopt opts;
866 int ret;
867
868 ret = parse_options(data, &opts);
869 if (ret)
870 return ERR_PTR(ret);
871
872 if (!opts.dev_name)
873 opts.dev_name = dev_name;
874 return mount_nodev(type, flags, &opts, exofs_fill_super);
875 }
876
877 /*
878 * Return information about the file system state in the buffer. This is used
879 * by the 'df' command, for example.
880 */
exofs_statfs(struct dentry * dentry,struct kstatfs * buf)881 static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
882 {
883 struct super_block *sb = dentry->d_sb;
884 struct exofs_sb_info *sbi = sb->s_fs_info;
885 struct ore_io_state *ios;
886 struct osd_attr attrs[] = {
887 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
888 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
889 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
890 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
891 };
892 uint64_t capacity = ULLONG_MAX;
893 uint64_t used = ULLONG_MAX;
894 int ret;
895
896 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
897 if (ret) {
898 EXOFS_DBGMSG("ore_get_io_state failed.\n");
899 return ret;
900 }
901
902 ios->in_attr = attrs;
903 ios->in_attr_len = ARRAY_SIZE(attrs);
904
905 ret = ore_read(ios);
906 if (unlikely(ret))
907 goto out;
908
909 ret = extract_attr_from_ios(ios, &attrs[0]);
910 if (likely(!ret)) {
911 capacity = get_unaligned_be64(attrs[0].val_ptr);
912 if (unlikely(!capacity))
913 capacity = ULLONG_MAX;
914 } else
915 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
916
917 ret = extract_attr_from_ios(ios, &attrs[1]);
918 if (likely(!ret))
919 used = get_unaligned_be64(attrs[1].val_ptr);
920 else
921 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
922
923 /* fill in the stats buffer */
924 buf->f_type = EXOFS_SUPER_MAGIC;
925 buf->f_bsize = EXOFS_BLKSIZE;
926 buf->f_blocks = capacity >> 9;
927 buf->f_bfree = (capacity - used) >> 9;
928 buf->f_bavail = buf->f_bfree;
929 buf->f_files = sbi->s_numfiles;
930 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
931 buf->f_namelen = EXOFS_NAME_LEN;
932
933 out:
934 ore_put_io_state(ios);
935 return ret;
936 }
937
938 static const struct super_operations exofs_sops = {
939 .alloc_inode = exofs_alloc_inode,
940 .destroy_inode = exofs_destroy_inode,
941 .write_inode = exofs_write_inode,
942 .evict_inode = exofs_evict_inode,
943 .put_super = exofs_put_super,
944 .sync_fs = exofs_sync_fs,
945 .statfs = exofs_statfs,
946 };
947
948 /******************************************************************************
949 * EXPORT OPERATIONS
950 *****************************************************************************/
951
exofs_get_parent(struct dentry * child)952 static struct dentry *exofs_get_parent(struct dentry *child)
953 {
954 unsigned long ino = exofs_parent_ino(child);
955
956 if (!ino)
957 return ERR_PTR(-ESTALE);
958
959 return d_obtain_alias(exofs_iget(child->d_sb, ino));
960 }
961
exofs_nfs_get_inode(struct super_block * sb,u64 ino,u32 generation)962 static struct inode *exofs_nfs_get_inode(struct super_block *sb,
963 u64 ino, u32 generation)
964 {
965 struct inode *inode;
966
967 inode = exofs_iget(sb, ino);
968 if (IS_ERR(inode))
969 return ERR_CAST(inode);
970 if (generation && inode->i_generation != generation) {
971 /* we didn't find the right inode.. */
972 iput(inode);
973 return ERR_PTR(-ESTALE);
974 }
975 return inode;
976 }
977
exofs_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)978 static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
979 struct fid *fid, int fh_len, int fh_type)
980 {
981 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
982 exofs_nfs_get_inode);
983 }
984
exofs_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)985 static struct dentry *exofs_fh_to_parent(struct super_block *sb,
986 struct fid *fid, int fh_len, int fh_type)
987 {
988 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
989 exofs_nfs_get_inode);
990 }
991
992 static const struct export_operations exofs_export_ops = {
993 .fh_to_dentry = exofs_fh_to_dentry,
994 .fh_to_parent = exofs_fh_to_parent,
995 .get_parent = exofs_get_parent,
996 };
997
998 /******************************************************************************
999 * INSMOD/RMMOD
1000 *****************************************************************************/
1001
1002 /*
1003 * struct that describes this file system
1004 */
1005 static struct file_system_type exofs_type = {
1006 .owner = THIS_MODULE,
1007 .name = "exofs",
1008 .mount = exofs_mount,
1009 .kill_sb = generic_shutdown_super,
1010 };
1011 MODULE_ALIAS_FS("exofs");
1012
init_exofs(void)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
exit_exofs(void)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)
1048
