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
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 */
parse_options(char * options,struct exofs_mountopt * opts)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 kfree(opts->dev_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 oi->vfs_inode.i_version = 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("exofs_inode_cache",
197 sizeof(struct exofs_i_info), 0,
198 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD |
199 SLAB_ACCOUNT, exofs_init_once);
200 if (exofs_inode_cachep == NULL)
201 return -ENOMEM;
202 return 0;
203 }
204
205 /*
206 * Destroy the inode cache
207 */
destroy_inodecache(void)208 static void destroy_inodecache(void)
209 {
210 /*
211 * Make sure all delayed rcu free inodes are flushed before we
212 * destroy cache.
213 */
214 rcu_barrier();
215 kmem_cache_destroy(exofs_inode_cachep);
216 }
217
218 /******************************************************************************
219 * Some osd helpers
220 *****************************************************************************/
exofs_make_credential(u8 cred_a[OSD_CAP_LEN],const struct osd_obj_id * obj)221 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
222 {
223 osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
224 }
225
exofs_read_kern(struct osd_dev * od,u8 * cred,struct osd_obj_id * obj,u64 offset,void * p,unsigned length)226 static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
227 u64 offset, void *p, unsigned length)
228 {
229 struct osd_request *or = osd_start_request(od, GFP_KERNEL);
230 /* struct osd_sense_info osi = {.key = 0};*/
231 int ret;
232
233 if (unlikely(!or)) {
234 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
235 return -ENOMEM;
236 }
237 ret = osd_req_read_kern(or, obj, offset, p, length);
238 if (unlikely(ret)) {
239 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
240 goto out;
241 }
242
243 ret = osd_finalize_request(or, 0, cred, NULL);
244 if (unlikely(ret)) {
245 EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret);
246 goto out;
247 }
248
249 ret = osd_execute_request(or);
250 if (unlikely(ret))
251 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
252 /* osd_req_decode_sense(or, ret); */
253
254 out:
255 osd_end_request(or);
256 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
257 "length=0x%llx dev=%p ret=>%d\n",
258 _LLU(obj->id), _LLU(offset), _LLU(length), od, ret);
259 return ret;
260 }
261
262 static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
263 EXOFS_APAGE_SB_DATA,
264 EXOFS_ATTR_SB_STATS,
265 sizeof(struct exofs_sb_stats));
266
__sbi_read_stats(struct exofs_sb_info * sbi)267 static int __sbi_read_stats(struct exofs_sb_info *sbi)
268 {
269 struct osd_attr attrs[] = {
270 [0] = g_attr_sb_stats,
271 };
272 struct ore_io_state *ios;
273 int ret;
274
275 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
276 if (unlikely(ret)) {
277 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
278 return ret;
279 }
280
281 ios->in_attr = attrs;
282 ios->in_attr_len = ARRAY_SIZE(attrs);
283
284 ret = ore_read(ios);
285 if (unlikely(ret)) {
286 EXOFS_ERR("Error reading super_block stats => %d\n", ret);
287 goto out;
288 }
289
290 ret = extract_attr_from_ios(ios, &attrs[0]);
291 if (ret) {
292 EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
293 goto out;
294 }
295 if (attrs[0].len) {
296 struct exofs_sb_stats *ess;
297
298 if (unlikely(attrs[0].len != sizeof(*ess))) {
299 EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
300 "size(%d) != expected(%zd)\n",
301 __func__, attrs[0].len, sizeof(*ess));
302 goto out;
303 }
304
305 ess = attrs[0].val_ptr;
306 sbi->s_nextid = le64_to_cpu(ess->s_nextid);
307 sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
308 }
309
310 out:
311 ore_put_io_state(ios);
312 return ret;
313 }
314
stats_done(struct ore_io_state * ios,void * p)315 static void stats_done(struct ore_io_state *ios, void *p)
316 {
317 ore_put_io_state(ios);
318 /* Good thanks nothing to do anymore */
319 }
320
321 /* Asynchronously write the stats attribute */
exofs_sbi_write_stats(struct exofs_sb_info * sbi)322 int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
323 {
324 struct osd_attr attrs[] = {
325 [0] = g_attr_sb_stats,
326 };
327 struct ore_io_state *ios;
328 int ret;
329
330 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
331 if (unlikely(ret)) {
332 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
333 return ret;
334 }
335
336 sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid);
337 sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
338 attrs[0].val_ptr = &sbi->s_ess;
339
340
341 ios->done = stats_done;
342 ios->private = sbi;
343 ios->out_attr = attrs;
344 ios->out_attr_len = ARRAY_SIZE(attrs);
345
346 ret = ore_write(ios);
347 if (unlikely(ret)) {
348 EXOFS_ERR("%s: ore_write failed.\n", __func__);
349 ore_put_io_state(ios);
350 }
351
352 return ret;
353 }
354
355 /******************************************************************************
356 * SUPERBLOCK FUNCTIONS
357 *****************************************************************************/
358 static const struct super_operations exofs_sops;
359 static const struct export_operations exofs_export_ops;
360
361 /*
362 * Write the superblock to the OSD
363 */
exofs_sync_fs(struct super_block * sb,int wait)364 static int exofs_sync_fs(struct super_block *sb, int wait)
365 {
366 struct exofs_sb_info *sbi;
367 struct exofs_fscb *fscb;
368 struct ore_comp one_comp;
369 struct ore_components oc;
370 struct ore_io_state *ios;
371 int ret = -ENOMEM;
372
373 fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
374 if (unlikely(!fscb))
375 return -ENOMEM;
376
377 sbi = sb->s_fs_info;
378
379 /* NOTE: We no longer dirty the super_block anywhere in exofs. The
380 * reason we write the fscb here on unmount is so we can stay backwards
381 * compatible with fscb->s_version == 1. (What we are not compatible
382 * with is if a new version FS crashed and then we try to mount an old
383 * version). Otherwise the exofs_fscb is read-only from mkfs time. All
384 * the writeable info is set in exofs_sbi_write_stats() above.
385 */
386
387 exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID);
388
389 ret = ore_get_io_state(&sbi->layout, &oc, &ios);
390 if (unlikely(ret))
391 goto out;
392
393 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
394 memset(fscb, 0, ios->length);
395 fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
396 fscb->s_numfiles = cpu_to_le64(sbi->s_numfiles);
397 fscb->s_magic = cpu_to_le16(sb->s_magic);
398 fscb->s_newfs = 0;
399 fscb->s_version = EXOFS_FSCB_VER;
400
401 ios->offset = 0;
402 ios->kern_buff = fscb;
403
404 ret = ore_write(ios);
405 if (unlikely(ret))
406 EXOFS_ERR("%s: ore_write failed.\n", __func__);
407
408 out:
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
_exofs_print_device(const char * msg,const char * dev_path,struct osd_dev * od,u64 pid)415 static void _exofs_print_device(const char *msg, const char *dev_path,
416 struct osd_dev *od, u64 pid)
417 {
418 const struct osd_dev_info *odi = osduld_device_info(od);
419
420 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
421 msg, dev_path ?: "", odi->osdname, _LLU(pid));
422 }
423
exofs_free_sbi(struct exofs_sb_info * sbi)424 static void exofs_free_sbi(struct exofs_sb_info *sbi)
425 {
426 unsigned numdevs = sbi->oc.numdevs;
427
428 while (numdevs) {
429 unsigned i = --numdevs;
430 struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
431
432 if (od) {
433 ore_comp_set_dev(&sbi->oc, i, NULL);
434 osduld_put_device(od);
435 }
436 }
437 kfree(sbi->oc.ods);
438 kfree(sbi);
439 }
440
441 /*
442 * This function is called when the vfs is freeing the superblock. We just
443 * need to free our own part.
444 */
exofs_put_super(struct super_block * sb)445 static void exofs_put_super(struct super_block *sb)
446 {
447 int num_pend;
448 struct exofs_sb_info *sbi = sb->s_fs_info;
449
450 /* make sure there are no pending commands */
451 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
452 num_pend = atomic_read(&sbi->s_curr_pending)) {
453 wait_queue_head_t wq;
454
455 printk(KERN_NOTICE "%s: !!Pending operations in flight. "
456 "This is a BUG. please report to osd-dev@open-osd.org\n",
457 __func__);
458 init_waitqueue_head(&wq);
459 wait_event_timeout(wq,
460 (atomic_read(&sbi->s_curr_pending) == 0),
461 msecs_to_jiffies(100));
462 }
463
464 _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
465 sbi->one_comp.obj.partition);
466
467 exofs_sysfs_sb_del(sbi);
468 exofs_free_sbi(sbi);
469 sb->s_fs_info = NULL;
470 }
471
_read_and_match_data_map(struct exofs_sb_info * sbi,unsigned numdevs,struct exofs_device_table * dt)472 static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
473 struct exofs_device_table *dt)
474 {
475 int ret;
476
477 sbi->layout.stripe_unit =
478 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
479 sbi->layout.group_width =
480 le32_to_cpu(dt->dt_data_map.cb_group_width);
481 sbi->layout.group_depth =
482 le32_to_cpu(dt->dt_data_map.cb_group_depth);
483 sbi->layout.mirrors_p1 =
484 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;
485 sbi->layout.raid_algorithm =
486 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
487
488 ret = ore_verify_layout(numdevs, &sbi->layout);
489
490 EXOFS_DBGMSG("exofs: layout: "
491 "num_comps=%u stripe_unit=0x%x group_width=%u "
492 "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n",
493 numdevs,
494 sbi->layout.stripe_unit,
495 sbi->layout.group_width,
496 _LLU(sbi->layout.group_depth),
497 sbi->layout.mirrors_p1,
498 sbi->layout.raid_algorithm);
499 return ret;
500 }
501
__ra_pages(struct ore_layout * layout)502 static unsigned __ra_pages(struct ore_layout *layout)
503 {
504 const unsigned _MIN_RA = 32; /* min 128K read-ahead */
505 unsigned ra_pages = layout->group_width * layout->stripe_unit /
506 PAGE_SIZE;
507 unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
508
509 ra_pages *= 2; /* two stripes */
510 if (ra_pages < _MIN_RA)
511 ra_pages = roundup(_MIN_RA, ra_pages / 2);
512
513 if (ra_pages > max_io_pages)
514 ra_pages = max_io_pages;
515
516 return ra_pages;
517 }
518
519 /* @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)520 static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
521 struct osd_dev_info *odi)
522 {
523 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
524 if (likely(odi->systemid_len))
525 memcpy(odi->systemid, dt_dev->systemid, OSD_SYSTEMID_LEN);
526
527 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
528 odi->osdname = dt_dev->osdname;
529
530 /* FIXME support long names. Will need a _put function */
531 if (dt_dev->long_name_offset)
532 return -EINVAL;
533
534 /* Make sure osdname is printable!
535 * mkexofs should give us space for a null-terminator else the
536 * device-table is invalid.
537 */
538 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
539 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
540 dt_dev->osdname[odi->osdname_len] = 0;
541
542 /* If it's all zeros something is bad we read past end-of-obj */
543 return !(odi->systemid_len || odi->osdname_len);
544 }
545
__alloc_dev_table(struct exofs_sb_info * sbi,unsigned numdevs,struct exofs_dev ** peds)546 static int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
547 struct exofs_dev **peds)
548 {
549 struct __alloc_ore_devs_and_exofs_devs {
550 /* Twice bigger table: See exofs_init_comps() and comment at
551 * exofs_read_lookup_dev_table()
552 */
553 struct ore_dev *oreds[numdevs * 2 - 1];
554 struct exofs_dev eds[numdevs];
555 } *aoded;
556 struct exofs_dev *eds;
557 unsigned i;
558
559 aoded = kzalloc(sizeof(*aoded), GFP_KERNEL);
560 if (unlikely(!aoded)) {
561 EXOFS_ERR("ERROR: failed allocating Device array[%d]\n",
562 numdevs);
563 return -ENOMEM;
564 }
565
566 sbi->oc.ods = aoded->oreds;
567 *peds = eds = aoded->eds;
568 for (i = 0; i < numdevs; ++i)
569 aoded->oreds[i] = &eds[i].ored;
570 return 0;
571 }
572
exofs_read_lookup_dev_table(struct exofs_sb_info * sbi,struct osd_dev * fscb_od,unsigned table_count)573 static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
574 struct osd_dev *fscb_od,
575 unsigned table_count)
576 {
577 struct ore_comp comp;
578 struct exofs_device_table *dt;
579 struct exofs_dev *eds;
580 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
581 sizeof(*dt);
582 unsigned numdevs, i;
583 int ret;
584
585 dt = kmalloc(table_bytes, GFP_KERNEL);
586 if (unlikely(!dt)) {
587 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
588 table_bytes);
589 return -ENOMEM;
590 }
591
592 sbi->oc.numdevs = 0;
593
594 comp.obj.partition = sbi->one_comp.obj.partition;
595 comp.obj.id = EXOFS_DEVTABLE_ID;
596 exofs_make_credential(comp.cred, &comp.obj);
597
598 ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt,
599 table_bytes);
600 if (unlikely(ret)) {
601 EXOFS_ERR("ERROR: reading device table\n");
602 goto out;
603 }
604
605 numdevs = le64_to_cpu(dt->dt_num_devices);
606 if (unlikely(!numdevs)) {
607 ret = -EINVAL;
608 goto out;
609 }
610 WARN_ON(table_count != numdevs);
611
612 ret = _read_and_match_data_map(sbi, numdevs, dt);
613 if (unlikely(ret))
614 goto out;
615
616 ret = __alloc_dev_table(sbi, numdevs, &eds);
617 if (unlikely(ret))
618 goto out;
619 /* exofs round-robins the device table view according to inode
620 * number. We hold a: twice bigger table hence inodes can point
621 * to any device and have a sequential view of the table
622 * starting at this device. See exofs_init_comps()
623 */
624 memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
625 (numdevs - 1) * sizeof(sbi->oc.ods[0]));
626
627 /* create sysfs subdir under which we put the device table
628 * And cluster layout. A Superblock is identified by the string:
629 * "dev[0].osdname"_"pid"
630 */
631 exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]);
632
633 for (i = 0; i < numdevs; i++) {
634 struct exofs_fscb fscb;
635 struct osd_dev_info odi;
636 struct osd_dev *od;
637
638 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
639 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
640 ret = -EINVAL;
641 goto out;
642 }
643
644 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
645 i, odi.osdname);
646
647 /* the exofs id is currently the table index */
648 eds[i].did = i;
649
650 /* On all devices the device table is identical. The user can
651 * specify any one of the participating devices on the command
652 * line. We always keep them in device-table order.
653 */
654 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
655 eds[i].ored.od = fscb_od;
656 ++sbi->oc.numdevs;
657 fscb_od = NULL;
658 exofs_sysfs_odev_add(&eds[i], sbi);
659 continue;
660 }
661
662 od = osduld_info_lookup(&odi);
663 if (IS_ERR(od)) {
664 ret = PTR_ERR(od);
665 EXOFS_ERR("ERROR: device requested is not found "
666 "osd_name-%s =>%d\n", odi.osdname, ret);
667 goto out;
668 }
669
670 eds[i].ored.od = od;
671 ++sbi->oc.numdevs;
672
673 /* Read the fscb of the other devices to make sure the FS
674 * partition is there.
675 */
676 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
677 sizeof(fscb));
678 if (unlikely(ret)) {
679 EXOFS_ERR("ERROR: Malformed participating device "
680 "error reading fscb osd_name-%s\n",
681 odi.osdname);
682 goto out;
683 }
684 exofs_sysfs_odev_add(&eds[i], sbi);
685
686 /* TODO: verify other information is correct and FS-uuid
687 * matches. Benny what did you say about device table
688 * generation and old devices?
689 */
690 }
691
692 out:
693 kfree(dt);
694 if (unlikely(fscb_od && !ret)) {
695 EXOFS_ERR("ERROR: Bad device-table container device not present\n");
696 osduld_put_device(fscb_od);
697 return -EINVAL;
698 }
699 return ret;
700 }
701
702 /*
703 * Read the superblock from the OSD and fill in the fields
704 */
exofs_fill_super(struct super_block * sb,struct exofs_mountopt * opts,struct exofs_sb_info * sbi,int silent)705 static int exofs_fill_super(struct super_block *sb,
706 struct exofs_mountopt *opts,
707 struct exofs_sb_info *sbi,
708 int silent)
709 {
710 struct inode *root;
711 struct osd_dev *od; /* Master device */
712 struct exofs_fscb fscb; /*on-disk superblock info */
713 struct ore_comp comp;
714 unsigned table_count;
715 int ret;
716
717 /* use mount options to fill superblock */
718 if (opts->is_osdname) {
719 struct osd_dev_info odi = {.systemid_len = 0};
720
721 odi.osdname_len = strlen(opts->dev_name);
722 odi.osdname = (u8 *)opts->dev_name;
723 od = osduld_info_lookup(&odi);
724 kfree(opts->dev_name);
725 opts->dev_name = NULL;
726 } else {
727 od = osduld_path_lookup(opts->dev_name);
728 }
729 if (IS_ERR(od)) {
730 ret = -EINVAL;
731 goto free_sbi;
732 }
733
734 /* Default layout in case we do not have a device-table */
735 sbi->layout.stripe_unit = PAGE_SIZE;
736 sbi->layout.mirrors_p1 = 1;
737 sbi->layout.group_width = 1;
738 sbi->layout.group_depth = -1;
739 sbi->layout.group_count = 1;
740 sbi->s_timeout = opts->timeout;
741
742 sbi->one_comp.obj.partition = opts->pid;
743 sbi->one_comp.obj.id = 0;
744 exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
745 sbi->oc.single_comp = EC_SINGLE_COMP;
746 sbi->oc.comps = &sbi->one_comp;
747
748 /* fill in some other data by hand */
749 memset(sb->s_id, 0, sizeof(sb->s_id));
750 strcpy(sb->s_id, "exofs");
751 sb->s_blocksize = EXOFS_BLKSIZE;
752 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
753 sb->s_maxbytes = MAX_LFS_FILESIZE;
754 sb->s_max_links = EXOFS_LINK_MAX;
755 atomic_set(&sbi->s_curr_pending, 0);
756 sb->s_bdev = NULL;
757 sb->s_dev = 0;
758
759 comp.obj.partition = sbi->one_comp.obj.partition;
760 comp.obj.id = EXOFS_SUPER_ID;
761 exofs_make_credential(comp.cred, &comp.obj);
762
763 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
764 if (unlikely(ret))
765 goto free_sbi;
766
767 sb->s_magic = le16_to_cpu(fscb.s_magic);
768 /* NOTE: we read below to be backward compatible with old versions */
769 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
770 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
771
772 /* make sure what we read from the object store is correct */
773 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
774 if (!silent)
775 EXOFS_ERR("ERROR: Bad magic value\n");
776 ret = -EINVAL;
777 goto free_sbi;
778 }
779 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
780 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
781 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
782 ret = -EINVAL;
783 goto free_sbi;
784 }
785
786 /* start generation numbers from a random point */
787 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
788 spin_lock_init(&sbi->s_next_gen_lock);
789
790 table_count = le64_to_cpu(fscb.s_dev_table_count);
791 if (table_count) {
792 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
793 if (unlikely(ret))
794 goto free_sbi;
795 } else {
796 struct exofs_dev *eds;
797
798 ret = __alloc_dev_table(sbi, 1, &eds);
799 if (unlikely(ret))
800 goto free_sbi;
801
802 ore_comp_set_dev(&sbi->oc, 0, od);
803 sbi->oc.numdevs = 1;
804 }
805
806 __sbi_read_stats(sbi);
807
808 /* set up operation vectors */
809 ret = super_setup_bdi(sb);
810 if (ret) {
811 EXOFS_DBGMSG("Failed to super_setup_bdi\n");
812 goto free_sbi;
813 }
814 sb->s_bdi->ra_pages = __ra_pages(&sbi->layout);
815 sb->s_fs_info = sbi;
816 sb->s_op = &exofs_sops;
817 sb->s_export_op = &exofs_export_ops;
818 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
819 if (IS_ERR(root)) {
820 EXOFS_ERR("ERROR: exofs_iget failed\n");
821 ret = PTR_ERR(root);
822 goto free_sbi;
823 }
824 sb->s_root = d_make_root(root);
825 if (!sb->s_root) {
826 EXOFS_ERR("ERROR: get root inode failed\n");
827 ret = -ENOMEM;
828 goto free_sbi;
829 }
830
831 if (!S_ISDIR(root->i_mode)) {
832 dput(sb->s_root);
833 sb->s_root = NULL;
834 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
835 root->i_mode);
836 ret = -EINVAL;
837 goto free_sbi;
838 }
839
840 exofs_sysfs_dbg_print();
841 _exofs_print_device("Mounting", opts->dev_name,
842 ore_comp_dev(&sbi->oc, 0),
843 sbi->one_comp.obj.partition);
844 return 0;
845
846 free_sbi:
847 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
848 opts->dev_name, sbi->one_comp.obj.partition, ret);
849 exofs_free_sbi(sbi);
850 return ret;
851 }
852
853 /*
854 * Set up the superblock (calls exofs_fill_super eventually)
855 */
exofs_mount(struct file_system_type * type,int flags,const char * dev_name,void * data)856 static struct dentry *exofs_mount(struct file_system_type *type,
857 int flags, const char *dev_name,
858 void *data)
859 {
860 struct super_block *s;
861 struct exofs_mountopt opts;
862 struct exofs_sb_info *sbi;
863 int ret;
864
865 ret = parse_options(data, &opts);
866 if (ret) {
867 kfree(opts.dev_name);
868 return ERR_PTR(ret);
869 }
870
871 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
872 if (!sbi) {
873 kfree(opts.dev_name);
874 return ERR_PTR(-ENOMEM);
875 }
876
877 s = sget(type, NULL, set_anon_super, flags, NULL);
878
879 if (IS_ERR(s)) {
880 kfree(opts.dev_name);
881 kfree(sbi);
882 return ERR_CAST(s);
883 }
884
885 if (!opts.dev_name)
886 opts.dev_name = dev_name;
887
888
889 ret = exofs_fill_super(s, &opts, sbi, flags & SB_SILENT ? 1 : 0);
890 if (ret) {
891 deactivate_locked_super(s);
892 return ERR_PTR(ret);
893 }
894 s->s_flags |= SB_ACTIVE;
895 return dget(s->s_root);
896 }
897
898 /*
899 * Return information about the file system state in the buffer. This is used
900 * by the 'df' command, for example.
901 */
exofs_statfs(struct dentry * dentry,struct kstatfs * buf)902 static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
903 {
904 struct super_block *sb = dentry->d_sb;
905 struct exofs_sb_info *sbi = sb->s_fs_info;
906 struct ore_io_state *ios;
907 struct osd_attr attrs[] = {
908 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
909 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
910 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
911 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
912 };
913 uint64_t capacity = ULLONG_MAX;
914 uint64_t used = ULLONG_MAX;
915 int ret;
916
917 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
918 if (ret) {
919 EXOFS_DBGMSG("ore_get_io_state failed.\n");
920 return ret;
921 }
922
923 ios->in_attr = attrs;
924 ios->in_attr_len = ARRAY_SIZE(attrs);
925
926 ret = ore_read(ios);
927 if (unlikely(ret))
928 goto out;
929
930 ret = extract_attr_from_ios(ios, &attrs[0]);
931 if (likely(!ret)) {
932 capacity = get_unaligned_be64(attrs[0].val_ptr);
933 if (unlikely(!capacity))
934 capacity = ULLONG_MAX;
935 } else
936 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
937
938 ret = extract_attr_from_ios(ios, &attrs[1]);
939 if (likely(!ret))
940 used = get_unaligned_be64(attrs[1].val_ptr);
941 else
942 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
943
944 /* fill in the stats buffer */
945 buf->f_type = EXOFS_SUPER_MAGIC;
946 buf->f_bsize = EXOFS_BLKSIZE;
947 buf->f_blocks = capacity >> 9;
948 buf->f_bfree = (capacity - used) >> 9;
949 buf->f_bavail = buf->f_bfree;
950 buf->f_files = sbi->s_numfiles;
951 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
952 buf->f_namelen = EXOFS_NAME_LEN;
953
954 out:
955 ore_put_io_state(ios);
956 return ret;
957 }
958
959 static const struct super_operations exofs_sops = {
960 .alloc_inode = exofs_alloc_inode,
961 .destroy_inode = exofs_destroy_inode,
962 .write_inode = exofs_write_inode,
963 .evict_inode = exofs_evict_inode,
964 .put_super = exofs_put_super,
965 .sync_fs = exofs_sync_fs,
966 .statfs = exofs_statfs,
967 };
968
969 /******************************************************************************
970 * EXPORT OPERATIONS
971 *****************************************************************************/
972
exofs_get_parent(struct dentry * child)973 static struct dentry *exofs_get_parent(struct dentry *child)
974 {
975 unsigned long ino = exofs_parent_ino(child);
976
977 if (!ino)
978 return ERR_PTR(-ESTALE);
979
980 return d_obtain_alias(exofs_iget(child->d_sb, ino));
981 }
982
exofs_nfs_get_inode(struct super_block * sb,u64 ino,u32 generation)983 static struct inode *exofs_nfs_get_inode(struct super_block *sb,
984 u64 ino, u32 generation)
985 {
986 struct inode *inode;
987
988 inode = exofs_iget(sb, ino);
989 if (IS_ERR(inode))
990 return ERR_CAST(inode);
991 if (generation && inode->i_generation != generation) {
992 /* we didn't find the right inode.. */
993 iput(inode);
994 return ERR_PTR(-ESTALE);
995 }
996 return inode;
997 }
998
exofs_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)999 static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
1000 struct fid *fid, int fh_len, int fh_type)
1001 {
1002 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1003 exofs_nfs_get_inode);
1004 }
1005
exofs_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)1006 static struct dentry *exofs_fh_to_parent(struct super_block *sb,
1007 struct fid *fid, int fh_len, int fh_type)
1008 {
1009 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1010 exofs_nfs_get_inode);
1011 }
1012
1013 static const struct export_operations exofs_export_ops = {
1014 .fh_to_dentry = exofs_fh_to_dentry,
1015 .fh_to_parent = exofs_fh_to_parent,
1016 .get_parent = exofs_get_parent,
1017 };
1018
1019 /******************************************************************************
1020 * INSMOD/RMMOD
1021 *****************************************************************************/
1022
1023 /*
1024 * struct that describes this file system
1025 */
1026 static struct file_system_type exofs_type = {
1027 .owner = THIS_MODULE,
1028 .name = "exofs",
1029 .mount = exofs_mount,
1030 .kill_sb = generic_shutdown_super,
1031 };
1032 MODULE_ALIAS_FS("exofs");
1033
init_exofs(void)1034 static int __init init_exofs(void)
1035 {
1036 int err;
1037
1038 err = init_inodecache();
1039 if (err)
1040 goto out;
1041
1042 err = register_filesystem(&exofs_type);
1043 if (err)
1044 goto out_d;
1045
1046 /* We don't fail if sysfs creation failed */
1047 exofs_sysfs_init();
1048
1049 return 0;
1050 out_d:
1051 destroy_inodecache();
1052 out:
1053 return err;
1054 }
1055
exit_exofs(void)1056 static void __exit exit_exofs(void)
1057 {
1058 exofs_sysfs_uninit();
1059 unregister_filesystem(&exofs_type);
1060 destroy_inodecache();
1061 }
1062
1063 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
1064 MODULE_DESCRIPTION("exofs");
1065 MODULE_LICENSE("GPL");
1066
1067 module_init(init_exofs)
1068 module_exit(exit_exofs)
1069