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 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("Timeout 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 */
exofs_alloc_inode(struct super_block * sb)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
exofs_i_callback(struct rcu_head * head)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 */
exofs_destroy_inode(struct inode * inode)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 */
exofs_init_once(void * foo)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 */
init_inodecache(void)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 SLAB_ACCOUNT, exofs_init_once);
199 if (exofs_inode_cachep == NULL)
200 return -ENOMEM;
201 return 0;
202 }
203
204 /*
205 * Destroy the inode cache
206 */
destroy_inodecache(void)207 static void destroy_inodecache(void)
208 {
209 /*
210 * Make sure all delayed rcu free inodes are flushed before we
211 * destroy cache.
212 */
213 rcu_barrier();
214 kmem_cache_destroy(exofs_inode_cachep);
215 }
216
217 /******************************************************************************
218 * Some osd helpers
219 *****************************************************************************/
exofs_make_credential(u8 cred_a[OSD_CAP_LEN],const struct osd_obj_id * obj)220 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
221 {
222 osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
223 }
224
exofs_read_kern(struct osd_dev * od,u8 * cred,struct osd_obj_id * obj,u64 offset,void * p,unsigned length)225 static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
226 u64 offset, void *p, unsigned length)
227 {
228 struct osd_request *or = osd_start_request(od, GFP_KERNEL);
229 /* struct osd_sense_info osi = {.key = 0};*/
230 int ret;
231
232 if (unlikely(!or)) {
233 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
234 return -ENOMEM;
235 }
236 ret = osd_req_read_kern(or, obj, offset, p, length);
237 if (unlikely(ret)) {
238 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
239 goto out;
240 }
241
242 ret = osd_finalize_request(or, 0, cred, NULL);
243 if (unlikely(ret)) {
244 EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret);
245 goto out;
246 }
247
248 ret = osd_execute_request(or);
249 if (unlikely(ret))
250 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
251 /* osd_req_decode_sense(or, ret); */
252
253 out:
254 osd_end_request(or);
255 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
256 "length=0x%llx dev=%p ret=>%d\n",
257 _LLU(obj->id), _LLU(offset), _LLU(length), od, ret);
258 return ret;
259 }
260
261 static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
262 EXOFS_APAGE_SB_DATA,
263 EXOFS_ATTR_SB_STATS,
264 sizeof(struct exofs_sb_stats));
265
__sbi_read_stats(struct exofs_sb_info * sbi)266 static int __sbi_read_stats(struct exofs_sb_info *sbi)
267 {
268 struct osd_attr attrs[] = {
269 [0] = g_attr_sb_stats,
270 };
271 struct ore_io_state *ios;
272 int ret;
273
274 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
275 if (unlikely(ret)) {
276 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
277 return ret;
278 }
279
280 ios->in_attr = attrs;
281 ios->in_attr_len = ARRAY_SIZE(attrs);
282
283 ret = ore_read(ios);
284 if (unlikely(ret)) {
285 EXOFS_ERR("Error reading super_block stats => %d\n", ret);
286 goto out;
287 }
288
289 ret = extract_attr_from_ios(ios, &attrs[0]);
290 if (ret) {
291 EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
292 goto out;
293 }
294 if (attrs[0].len) {
295 struct exofs_sb_stats *ess;
296
297 if (unlikely(attrs[0].len != sizeof(*ess))) {
298 EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
299 "size(%d) != expected(%zd)\n",
300 __func__, attrs[0].len, sizeof(*ess));
301 goto out;
302 }
303
304 ess = attrs[0].val_ptr;
305 sbi->s_nextid = le64_to_cpu(ess->s_nextid);
306 sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
307 }
308
309 out:
310 ore_put_io_state(ios);
311 return ret;
312 }
313
stats_done(struct ore_io_state * ios,void * p)314 static void stats_done(struct ore_io_state *ios, void *p)
315 {
316 ore_put_io_state(ios);
317 /* Good thanks nothing to do anymore */
318 }
319
320 /* Asynchronously write the stats attribute */
exofs_sbi_write_stats(struct exofs_sb_info * sbi)321 int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
322 {
323 struct osd_attr attrs[] = {
324 [0] = g_attr_sb_stats,
325 };
326 struct ore_io_state *ios;
327 int ret;
328
329 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
330 if (unlikely(ret)) {
331 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
332 return ret;
333 }
334
335 sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid);
336 sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
337 attrs[0].val_ptr = &sbi->s_ess;
338
339
340 ios->done = stats_done;
341 ios->private = sbi;
342 ios->out_attr = attrs;
343 ios->out_attr_len = ARRAY_SIZE(attrs);
344
345 ret = ore_write(ios);
346 if (unlikely(ret)) {
347 EXOFS_ERR("%s: ore_write failed.\n", __func__);
348 ore_put_io_state(ios);
349 }
350
351 return ret;
352 }
353
354 /******************************************************************************
355 * SUPERBLOCK FUNCTIONS
356 *****************************************************************************/
357 static const struct super_operations exofs_sops;
358 static const struct export_operations exofs_export_ops;
359
360 /*
361 * Write the superblock to the OSD
362 */
exofs_sync_fs(struct super_block * sb,int wait)363 static int exofs_sync_fs(struct super_block *sb, int wait)
364 {
365 struct exofs_sb_info *sbi;
366 struct exofs_fscb *fscb;
367 struct ore_comp one_comp;
368 struct ore_components oc;
369 struct ore_io_state *ios;
370 int ret = -ENOMEM;
371
372 fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
373 if (unlikely(!fscb))
374 return -ENOMEM;
375
376 sbi = sb->s_fs_info;
377
378 /* NOTE: We no longer dirty the super_block anywhere in exofs. The
379 * reason we write the fscb here on unmount is so we can stay backwards
380 * compatible with fscb->s_version == 1. (What we are not compatible
381 * with is if a new version FS crashed and then we try to mount an old
382 * version). Otherwise the exofs_fscb is read-only from mkfs time. All
383 * the writeable info is set in exofs_sbi_write_stats() above.
384 */
385
386 exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID);
387
388 ret = ore_get_io_state(&sbi->layout, &oc, &ios);
389 if (unlikely(ret))
390 goto out;
391
392 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
393 memset(fscb, 0, ios->length);
394 fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
395 fscb->s_numfiles = cpu_to_le64(sbi->s_numfiles);
396 fscb->s_magic = cpu_to_le16(sb->s_magic);
397 fscb->s_newfs = 0;
398 fscb->s_version = EXOFS_FSCB_VER;
399
400 ios->offset = 0;
401 ios->kern_buff = fscb;
402
403 ret = ore_write(ios);
404 if (unlikely(ret))
405 EXOFS_ERR("%s: ore_write failed.\n", __func__);
406
407 out:
408 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
409 ore_put_io_state(ios);
410 kfree(fscb);
411 return ret;
412 }
413
_exofs_print_device(const char * msg,const char * dev_path,struct osd_dev * od,u64 pid)414 static void _exofs_print_device(const char *msg, const char *dev_path,
415 struct osd_dev *od, u64 pid)
416 {
417 const struct osd_dev_info *odi = osduld_device_info(od);
418
419 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
420 msg, dev_path ?: "", odi->osdname, _LLU(pid));
421 }
422
exofs_free_sbi(struct exofs_sb_info * sbi)423 static void exofs_free_sbi(struct exofs_sb_info *sbi)
424 {
425 unsigned numdevs = sbi->oc.numdevs;
426
427 while (numdevs) {
428 unsigned i = --numdevs;
429 struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
430
431 if (od) {
432 ore_comp_set_dev(&sbi->oc, i, NULL);
433 osduld_put_device(od);
434 }
435 }
436 kfree(sbi->oc.ods);
437 kfree(sbi);
438 }
439
440 /*
441 * This function is called when the vfs is freeing the superblock. We just
442 * need to free our own part.
443 */
exofs_put_super(struct super_block * sb)444 static void exofs_put_super(struct super_block *sb)
445 {
446 int num_pend;
447 struct exofs_sb_info *sbi = sb->s_fs_info;
448
449 /* make sure there are no pending commands */
450 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
451 num_pend = atomic_read(&sbi->s_curr_pending)) {
452 wait_queue_head_t wq;
453
454 printk(KERN_NOTICE "%s: !!Pending operations in flight. "
455 "This is a BUG. please report to osd-dev@open-osd.org\n",
456 __func__);
457 init_waitqueue_head(&wq);
458 wait_event_timeout(wq,
459 (atomic_read(&sbi->s_curr_pending) == 0),
460 msecs_to_jiffies(100));
461 }
462
463 _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
464 sbi->one_comp.obj.partition);
465
466 exofs_sysfs_sb_del(sbi);
467 bdi_destroy(&sbi->bdi);
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,void * data,int silent)705 static int exofs_fill_super(struct super_block *sb, void *data, int silent)
706 {
707 struct inode *root;
708 struct exofs_mountopt *opts = data;
709 struct exofs_sb_info *sbi; /*extended info */
710 struct osd_dev *od; /* Master device */
711 struct exofs_fscb fscb; /*on-disk superblock info */
712 struct ore_comp comp;
713 unsigned table_count;
714 int ret;
715
716 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
717 if (!sbi)
718 return -ENOMEM;
719
720 /* use mount options to fill superblock */
721 if (opts->is_osdname) {
722 struct osd_dev_info odi = {.systemid_len = 0};
723
724 odi.osdname_len = strlen(opts->dev_name);
725 odi.osdname = (u8 *)opts->dev_name;
726 od = osduld_info_lookup(&odi);
727 kfree(opts->dev_name);
728 opts->dev_name = NULL;
729 } else {
730 od = osduld_path_lookup(opts->dev_name);
731 }
732 if (IS_ERR(od)) {
733 ret = -EINVAL;
734 goto free_sbi;
735 }
736
737 /* Default layout in case we do not have a device-table */
738 sbi->layout.stripe_unit = PAGE_SIZE;
739 sbi->layout.mirrors_p1 = 1;
740 sbi->layout.group_width = 1;
741 sbi->layout.group_depth = -1;
742 sbi->layout.group_count = 1;
743 sbi->s_timeout = opts->timeout;
744
745 sbi->one_comp.obj.partition = opts->pid;
746 sbi->one_comp.obj.id = 0;
747 exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
748 sbi->oc.single_comp = EC_SINGLE_COMP;
749 sbi->oc.comps = &sbi->one_comp;
750
751 /* fill in some other data by hand */
752 memset(sb->s_id, 0, sizeof(sb->s_id));
753 strcpy(sb->s_id, "exofs");
754 sb->s_blocksize = EXOFS_BLKSIZE;
755 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
756 sb->s_maxbytes = MAX_LFS_FILESIZE;
757 sb->s_max_links = EXOFS_LINK_MAX;
758 atomic_set(&sbi->s_curr_pending, 0);
759 sb->s_bdev = NULL;
760 sb->s_dev = 0;
761
762 comp.obj.partition = sbi->one_comp.obj.partition;
763 comp.obj.id = EXOFS_SUPER_ID;
764 exofs_make_credential(comp.cred, &comp.obj);
765
766 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
767 if (unlikely(ret))
768 goto free_sbi;
769
770 sb->s_magic = le16_to_cpu(fscb.s_magic);
771 /* NOTE: we read below to be backward compatible with old versions */
772 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
773 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
774
775 /* make sure what we read from the object store is correct */
776 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
777 if (!silent)
778 EXOFS_ERR("ERROR: Bad magic value\n");
779 ret = -EINVAL;
780 goto free_sbi;
781 }
782 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
783 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
784 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
785 ret = -EINVAL;
786 goto free_sbi;
787 }
788
789 /* start generation numbers from a random point */
790 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
791 spin_lock_init(&sbi->s_next_gen_lock);
792
793 table_count = le64_to_cpu(fscb.s_dev_table_count);
794 if (table_count) {
795 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
796 if (unlikely(ret))
797 goto free_sbi;
798 } else {
799 struct exofs_dev *eds;
800
801 ret = __alloc_dev_table(sbi, 1, &eds);
802 if (unlikely(ret))
803 goto free_sbi;
804
805 ore_comp_set_dev(&sbi->oc, 0, od);
806 sbi->oc.numdevs = 1;
807 }
808
809 __sbi_read_stats(sbi);
810
811 /* set up operation vectors */
812 sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
813 sb->s_bdi = &sbi->bdi;
814 sb->s_fs_info = sbi;
815 sb->s_op = &exofs_sops;
816 sb->s_export_op = &exofs_export_ops;
817 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
818 if (IS_ERR(root)) {
819 EXOFS_ERR("ERROR: exofs_iget failed\n");
820 ret = PTR_ERR(root);
821 goto free_sbi;
822 }
823 sb->s_root = d_make_root(root);
824 if (!sb->s_root) {
825 EXOFS_ERR("ERROR: get root inode failed\n");
826 ret = -ENOMEM;
827 goto free_sbi;
828 }
829
830 if (!S_ISDIR(root->i_mode)) {
831 dput(sb->s_root);
832 sb->s_root = NULL;
833 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
834 root->i_mode);
835 ret = -EINVAL;
836 goto free_sbi;
837 }
838
839 ret = bdi_setup_and_register(&sbi->bdi, "exofs");
840 if (ret) {
841 EXOFS_DBGMSG("Failed to bdi_setup_and_register\n");
842 dput(sb->s_root);
843 sb->s_root = NULL;
844 goto free_sbi;
845 }
846
847 exofs_sysfs_dbg_print();
848 _exofs_print_device("Mounting", opts->dev_name,
849 ore_comp_dev(&sbi->oc, 0),
850 sbi->one_comp.obj.partition);
851 return 0;
852
853 free_sbi:
854 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
855 opts->dev_name, sbi->one_comp.obj.partition, ret);
856 exofs_free_sbi(sbi);
857 return ret;
858 }
859
860 /*
861 * Set up the superblock (calls exofs_fill_super eventually)
862 */
exofs_mount(struct file_system_type * type,int flags,const char * dev_name,void * data)863 static struct dentry *exofs_mount(struct file_system_type *type,
864 int flags, const char *dev_name,
865 void *data)
866 {
867 struct exofs_mountopt opts;
868 int ret;
869
870 ret = parse_options(data, &opts);
871 if (ret)
872 return ERR_PTR(ret);
873
874 if (!opts.dev_name)
875 opts.dev_name = dev_name;
876 return mount_nodev(type, flags, &opts, exofs_fill_super);
877 }
878
879 /*
880 * Return information about the file system state in the buffer. This is used
881 * by the 'df' command, for example.
882 */
exofs_statfs(struct dentry * dentry,struct kstatfs * buf)883 static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
884 {
885 struct super_block *sb = dentry->d_sb;
886 struct exofs_sb_info *sbi = sb->s_fs_info;
887 struct ore_io_state *ios;
888 struct osd_attr attrs[] = {
889 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
890 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
891 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
892 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
893 };
894 uint64_t capacity = ULLONG_MAX;
895 uint64_t used = ULLONG_MAX;
896 int ret;
897
898 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
899 if (ret) {
900 EXOFS_DBGMSG("ore_get_io_state failed.\n");
901 return ret;
902 }
903
904 ios->in_attr = attrs;
905 ios->in_attr_len = ARRAY_SIZE(attrs);
906
907 ret = ore_read(ios);
908 if (unlikely(ret))
909 goto out;
910
911 ret = extract_attr_from_ios(ios, &attrs[0]);
912 if (likely(!ret)) {
913 capacity = get_unaligned_be64(attrs[0].val_ptr);
914 if (unlikely(!capacity))
915 capacity = ULLONG_MAX;
916 } else
917 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
918
919 ret = extract_attr_from_ios(ios, &attrs[1]);
920 if (likely(!ret))
921 used = get_unaligned_be64(attrs[1].val_ptr);
922 else
923 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
924
925 /* fill in the stats buffer */
926 buf->f_type = EXOFS_SUPER_MAGIC;
927 buf->f_bsize = EXOFS_BLKSIZE;
928 buf->f_blocks = capacity >> 9;
929 buf->f_bfree = (capacity - used) >> 9;
930 buf->f_bavail = buf->f_bfree;
931 buf->f_files = sbi->s_numfiles;
932 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
933 buf->f_namelen = EXOFS_NAME_LEN;
934
935 out:
936 ore_put_io_state(ios);
937 return ret;
938 }
939
940 static const struct super_operations exofs_sops = {
941 .alloc_inode = exofs_alloc_inode,
942 .destroy_inode = exofs_destroy_inode,
943 .write_inode = exofs_write_inode,
944 .evict_inode = exofs_evict_inode,
945 .put_super = exofs_put_super,
946 .sync_fs = exofs_sync_fs,
947 .statfs = exofs_statfs,
948 };
949
950 /******************************************************************************
951 * EXPORT OPERATIONS
952 *****************************************************************************/
953
exofs_get_parent(struct dentry * child)954 static struct dentry *exofs_get_parent(struct dentry *child)
955 {
956 unsigned long ino = exofs_parent_ino(child);
957
958 if (!ino)
959 return ERR_PTR(-ESTALE);
960
961 return d_obtain_alias(exofs_iget(child->d_sb, ino));
962 }
963
exofs_nfs_get_inode(struct super_block * sb,u64 ino,u32 generation)964 static struct inode *exofs_nfs_get_inode(struct super_block *sb,
965 u64 ino, u32 generation)
966 {
967 struct inode *inode;
968
969 inode = exofs_iget(sb, ino);
970 if (IS_ERR(inode))
971 return ERR_CAST(inode);
972 if (generation && inode->i_generation != generation) {
973 /* we didn't find the right inode.. */
974 iput(inode);
975 return ERR_PTR(-ESTALE);
976 }
977 return inode;
978 }
979
exofs_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)980 static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
981 struct fid *fid, int fh_len, int fh_type)
982 {
983 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
984 exofs_nfs_get_inode);
985 }
986
exofs_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)987 static struct dentry *exofs_fh_to_parent(struct super_block *sb,
988 struct fid *fid, int fh_len, int fh_type)
989 {
990 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
991 exofs_nfs_get_inode);
992 }
993
994 static const struct export_operations exofs_export_ops = {
995 .fh_to_dentry = exofs_fh_to_dentry,
996 .fh_to_parent = exofs_fh_to_parent,
997 .get_parent = exofs_get_parent,
998 };
999
1000 /******************************************************************************
1001 * INSMOD/RMMOD
1002 *****************************************************************************/
1003
1004 /*
1005 * struct that describes this file system
1006 */
1007 static struct file_system_type exofs_type = {
1008 .owner = THIS_MODULE,
1009 .name = "exofs",
1010 .mount = exofs_mount,
1011 .kill_sb = generic_shutdown_super,
1012 };
1013 MODULE_ALIAS_FS("exofs");
1014
init_exofs(void)1015 static int __init init_exofs(void)
1016 {
1017 int err;
1018
1019 err = init_inodecache();
1020 if (err)
1021 goto out;
1022
1023 err = register_filesystem(&exofs_type);
1024 if (err)
1025 goto out_d;
1026
1027 /* We don't fail if sysfs creation failed */
1028 exofs_sysfs_init();
1029
1030 return 0;
1031 out_d:
1032 destroy_inodecache();
1033 out:
1034 return err;
1035 }
1036
exit_exofs(void)1037 static void __exit exit_exofs(void)
1038 {
1039 exofs_sysfs_uninit();
1040 unregister_filesystem(&exofs_type);
1041 destroy_inodecache();
1042 }
1043
1044 MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
1045 MODULE_DESCRIPTION("exofs");
1046 MODULE_LICENSE("GPL");
1047
1048 module_init(init_exofs)
1049 module_exit(exit_exofs)
1050