blob: 79c3ae6e045693ec5e7e8f91cf031309be175242 [file] [log] [blame]
Boaz Harroshba9e5e92008-10-28 16:11:41 +02001/*
2 * Copyright (C) 2005, 2006
Boaz Harrosh27d2e142009-06-14 17:23:09 +03003 * Avishay Traeger (avishay@gmail.com)
Boaz Harroshba9e5e92008-10-28 16:11:41 +02004 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
6 *
7 * Copyrights for code taken from ext2:
8 * Copyright (C) 1992, 1993, 1994, 1995
9 * Remy Card (card@masi.ibp.fr)
10 * Laboratoire MASI - Institut Blaise Pascal
11 * Universite Pierre et Marie Curie (Paris VI)
12 * from
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * This file is part of exofs.
17 *
18 * exofs is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation. Since it is based on ext2, and the only
21 * valid version of GPL for the Linux kernel is version 2, the only valid
22 * version of GPL for exofs is version 2.
23 *
24 * exofs is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with exofs; if not, write to the Free Software
31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
32 */
33
34#include <linux/string.h>
35#include <linux/parser.h>
36#include <linux/vfs.h>
37#include <linux/random.h>
Boaz Harrosh8cf74b32009-03-22 12:47:26 +020038#include <linux/exportfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Boaz Harroshba9e5e92008-10-28 16:11:41 +020040
41#include "exofs.h"
42
43/******************************************************************************
44 * MOUNT OPTIONS
45 *****************************************************************************/
46
47/*
48 * struct to hold what we get from mount options
49 */
50struct exofs_mountopt {
51 const char *dev_name;
52 uint64_t pid;
53 int timeout;
54};
55
56/*
57 * exofs-specific mount-time options.
58 */
59enum { Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err };
60
61/*
62 * Our mount-time options. These should ideally be 64-bit unsigned, but the
63 * kernel's parsing functions do not currently support that. 32-bit should be
64 * sufficient for most applications now.
65 */
66static match_table_t tokens = {
67 {Opt_pid, "pid=%u"},
68 {Opt_to, "to=%u"},
69 {Opt_err, NULL}
70};
71
72/*
73 * The main option parsing method. Also makes sure that all of the mandatory
74 * mount options were set.
75 */
76static int parse_options(char *options, struct exofs_mountopt *opts)
77{
78 char *p;
79 substring_t args[MAX_OPT_ARGS];
80 int option;
81 bool s_pid = false;
82
83 EXOFS_DBGMSG("parse_options %s\n", options);
84 /* defaults */
85 memset(opts, 0, sizeof(*opts));
86 opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
87
88 while ((p = strsep(&options, ",")) != NULL) {
89 int token;
90 char str[32];
91
92 if (!*p)
93 continue;
94
95 token = match_token(p, tokens, args);
96 switch (token) {
97 case Opt_pid:
98 if (0 == match_strlcpy(str, &args[0], sizeof(str)))
99 return -EINVAL;
100 opts->pid = simple_strtoull(str, NULL, 0);
101 if (opts->pid < EXOFS_MIN_PID) {
102 EXOFS_ERR("Partition ID must be >= %u",
103 EXOFS_MIN_PID);
104 return -EINVAL;
105 }
106 s_pid = 1;
107 break;
108 case Opt_to:
109 if (match_int(&args[0], &option))
110 return -EINVAL;
111 if (option <= 0) {
112 EXOFS_ERR("Timout must be > 0");
113 return -EINVAL;
114 }
115 opts->timeout = option * HZ;
116 break;
117 }
118 }
119
120 if (!s_pid) {
121 EXOFS_ERR("Need to specify the following options:\n");
122 EXOFS_ERR(" -o pid=pid_no_to_use\n");
123 return -EINVAL;
124 }
125
126 return 0;
127}
128
129/******************************************************************************
130 * INODE CACHE
131 *****************************************************************************/
132
133/*
134 * Our inode cache. Isn't it pretty?
135 */
136static struct kmem_cache *exofs_inode_cachep;
137
138/*
139 * Allocate an inode in the cache
140 */
141static struct inode *exofs_alloc_inode(struct super_block *sb)
142{
143 struct exofs_i_info *oi;
144
145 oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
146 if (!oi)
147 return NULL;
148
149 oi->vfs_inode.i_version = 1;
150 return &oi->vfs_inode;
151}
152
153/*
154 * Remove an inode from the cache
155 */
156static void exofs_destroy_inode(struct inode *inode)
157{
158 kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
159}
160
161/*
162 * Initialize the inode
163 */
164static void exofs_init_once(void *foo)
165{
166 struct exofs_i_info *oi = foo;
167
168 inode_init_once(&oi->vfs_inode);
169}
170
171/*
172 * Create and initialize the inode cache
173 */
174static int init_inodecache(void)
175{
176 exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
177 sizeof(struct exofs_i_info), 0,
178 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
179 exofs_init_once);
180 if (exofs_inode_cachep == NULL)
181 return -ENOMEM;
182 return 0;
183}
184
185/*
186 * Destroy the inode cache
187 */
188static void destroy_inodecache(void)
189{
190 kmem_cache_destroy(exofs_inode_cachep);
191}
192
193/******************************************************************************
194 * SUPERBLOCK FUNCTIONS
195 *****************************************************************************/
196static const struct super_operations exofs_sops;
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200197static const struct export_operations exofs_export_ops;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200198
199/*
200 * Write the superblock to the OSD
201 */
Boaz Harroshbaaf94c2009-06-14 16:52:10 +0300202int exofs_sync_fs(struct super_block *sb, int wait)
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200203{
204 struct exofs_sb_info *sbi;
205 struct exofs_fscb *fscb;
Boaz Harrosh06886a52009-11-08 14:54:08 +0200206 struct exofs_io_state *ios;
Christoph Hellwig80e09fb2009-06-08 10:03:58 +0200207 int ret = -ENOMEM;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200208
Christoph Hellwigebc1ac12009-05-11 23:35:03 +0200209 lock_super(sb);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200210 sbi = sb->s_fs_info;
Boaz Harrosh06886a52009-11-08 14:54:08 +0200211 fscb = &sbi->s_fscb;
212
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200213 ret = exofs_get_io_state(&sbi->layout, &ios);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200214 if (ret)
215 goto out;
216
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200217 /* Note: We only write the changing part of the fscb. .i.e upto the
218 * the fscb->s_dev_table_oid member. There is no read-modify-write
219 * here.
220 */
221 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200222 memset(fscb, 0, ios->length);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200223 fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
224 fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
225 fscb->s_magic = cpu_to_le16(sb->s_magic);
226 fscb->s_newfs = 0;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200227 fscb->s_version = EXOFS_FSCB_VER;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200228
Boaz Harrosh06886a52009-11-08 14:54:08 +0200229 ios->obj.id = EXOFS_SUPER_ID;
230 ios->offset = 0;
231 ios->kern_buff = fscb;
232 ios->cred = sbi->s_cred;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200233
Boaz Harrosh06886a52009-11-08 14:54:08 +0200234 ret = exofs_sbi_write(ios);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200235 if (unlikely(ret)) {
Boaz Harrosh06886a52009-11-08 14:54:08 +0200236 EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200237 goto out;
238 }
239 sb->s_dirt = 0;
240
241out:
Boaz Harrosh06886a52009-11-08 14:54:08 +0200242 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
243 exofs_put_io_state(ios);
Christoph Hellwigebc1ac12009-05-11 23:35:03 +0200244 unlock_super(sb);
Christoph Hellwig80e09fb2009-06-08 10:03:58 +0200245 return ret;
246}
247
248static void exofs_write_super(struct super_block *sb)
249{
250 if (!(sb->s_flags & MS_RDONLY))
251 exofs_sync_fs(sb, 1);
252 else
253 sb->s_dirt = 0;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200254}
255
Boaz Harrosh19fe2942009-09-03 20:38:02 +0300256static void _exofs_print_device(const char *msg, const char *dev_path,
257 struct osd_dev *od, u64 pid)
258{
259 const struct osd_dev_info *odi = osduld_device_info(od);
260
261 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
262 msg, dev_path ?: "", odi->osdname, _LLU(pid));
263}
264
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200265void exofs_free_sbi(struct exofs_sb_info *sbi)
266{
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200267 while (sbi->layout.s_numdevs) {
268 int i = --sbi->layout.s_numdevs;
269 struct osd_dev *od = sbi->layout.s_ods[i];
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200270
271 if (od) {
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200272 sbi->layout.s_ods[i] = NULL;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200273 osduld_put_device(od);
274 }
275 }
276 kfree(sbi);
277}
278
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200279/*
280 * This function is called when the vfs is freeing the superblock. We just
281 * need to free our own part.
282 */
283static void exofs_put_super(struct super_block *sb)
284{
285 int num_pend;
286 struct exofs_sb_info *sbi = sb->s_fs_info;
287
Christoph Hellwig8c85e122009-04-28 18:00:26 +0200288 if (sb->s_dirt)
289 exofs_write_super(sb);
290
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200291 /* make sure there are no pending commands */
292 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
293 num_pend = atomic_read(&sbi->s_curr_pending)) {
294 wait_queue_head_t wq;
295 init_waitqueue_head(&wq);
296 wait_event_timeout(wq,
297 (atomic_read(&sbi->s_curr_pending) == 0),
298 msecs_to_jiffies(100));
299 }
300
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200301 _exofs_print_device("Unmounting", NULL, sbi->layout.s_ods[0],
302 sbi->layout.s_pid);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200303
Jens Axboeb3d0ab72010-04-22 12:26:04 +0200304 bdi_destroy(&sbi->bdi);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200305 exofs_free_sbi(sbi);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200306 sb->s_fs_info = NULL;
307}
308
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200309static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
310 struct exofs_device_table *dt)
311{
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200312 u64 stripe_length;
313
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200314 sbi->data_map.odm_num_comps =
315 le32_to_cpu(dt->dt_data_map.cb_num_comps);
316 sbi->data_map.odm_stripe_unit =
317 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
318 sbi->data_map.odm_group_width =
319 le32_to_cpu(dt->dt_data_map.cb_group_width);
320 sbi->data_map.odm_group_depth =
321 le32_to_cpu(dt->dt_data_map.cb_group_depth);
322 sbi->data_map.odm_mirror_cnt =
323 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt);
324 sbi->data_map.odm_raid_algorithm =
325 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
326
Boaz Harrosh50a76fd2010-02-11 13:01:39 +0200327/* FIXME: Only raid0 for now. if not so, do not mount */
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200328 if (sbi->data_map.odm_num_comps != numdevs) {
329 EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n",
330 sbi->data_map.odm_num_comps, numdevs);
331 return -EINVAL;
332 }
333 if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) {
334 EXOFS_ERR("Only RAID_0 for now\n");
335 return -EINVAL;
336 }
337 if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) {
338 EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n",
339 numdevs, sbi->data_map.odm_mirror_cnt);
340 return -EINVAL;
341 }
342
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200343 if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) {
344 EXOFS_ERR("Stripe Unit(0x%llx)"
345 " must be Multples of PAGE_SIZE(0x%lx)\n",
346 _LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE);
347 return -EINVAL;
348 }
349
350 sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit;
351 sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1;
Boaz Harrosh50a76fd2010-02-11 13:01:39 +0200352
353 if (sbi->data_map.odm_group_width) {
354 sbi->layout.group_width = sbi->data_map.odm_group_width;
355 sbi->layout.group_depth = sbi->data_map.odm_group_depth;
356 if (!sbi->layout.group_depth) {
357 EXOFS_ERR("group_depth == 0 && group_width != 0\n");
358 return -EINVAL;
359 }
360 sbi->layout.group_count = sbi->data_map.odm_num_comps /
361 sbi->layout.mirrors_p1 /
362 sbi->data_map.odm_group_width;
363 } else {
364 if (sbi->data_map.odm_group_depth) {
365 printk(KERN_NOTICE "Warning: group_depth ignored "
366 "group_width == 0 && group_depth == %d\n",
367 sbi->data_map.odm_group_depth);
368 sbi->data_map.odm_group_depth = 0;
369 }
370 sbi->layout.group_width = sbi->data_map.odm_num_comps /
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200371 sbi->layout.mirrors_p1;
Boaz Harrosh50a76fd2010-02-11 13:01:39 +0200372 sbi->layout.group_depth = -1;
373 sbi->layout.group_count = 1;
374 }
375
376 stripe_length = (u64)sbi->layout.group_width * sbi->layout.stripe_unit;
377 if (stripe_length >= (1ULL << 32)) {
378 EXOFS_ERR("Total Stripe length(0x%llx)"
379 " >= 32bit is not supported\n", _LLU(stripe_length));
380 return -EINVAL;
381 }
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200382
383 return 0;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200384}
385
386/* @odi is valid only as long as @fscb_dev is valid */
387static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
388 struct osd_dev_info *odi)
389{
390 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
391 memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len);
392
393 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
394 odi->osdname = dt_dev->osdname;
395
396 /* FIXME support long names. Will need a _put function */
397 if (dt_dev->long_name_offset)
398 return -EINVAL;
399
400 /* Make sure osdname is printable!
401 * mkexofs should give us space for a null-terminator else the
402 * device-table is invalid.
403 */
404 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
405 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
406 dt_dev->osdname[odi->osdname_len] = 0;
407
408 /* If it's all zeros something is bad we read past end-of-obj */
409 return !(odi->systemid_len || odi->osdname_len);
410}
411
412static int exofs_read_lookup_dev_table(struct exofs_sb_info **psbi,
413 unsigned table_count)
414{
415 struct exofs_sb_info *sbi = *psbi;
416 struct osd_dev *fscb_od;
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200417 struct osd_obj_id obj = {.partition = sbi->layout.s_pid,
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200418 .id = EXOFS_DEVTABLE_ID};
419 struct exofs_device_table *dt;
420 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
421 sizeof(*dt);
422 unsigned numdevs, i;
423 int ret;
424
425 dt = kmalloc(table_bytes, GFP_KERNEL);
426 if (unlikely(!dt)) {
427 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
428 table_bytes);
429 return -ENOMEM;
430 }
431
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200432 fscb_od = sbi->layout.s_ods[0];
433 sbi->layout.s_ods[0] = NULL;
434 sbi->layout.s_numdevs = 0;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200435 ret = exofs_read_kern(fscb_od, sbi->s_cred, &obj, 0, dt, table_bytes);
436 if (unlikely(ret)) {
437 EXOFS_ERR("ERROR: reading device table\n");
438 goto out;
439 }
440
441 numdevs = le64_to_cpu(dt->dt_num_devices);
442 if (unlikely(!numdevs)) {
443 ret = -EINVAL;
444 goto out;
445 }
446 WARN_ON(table_count != numdevs);
447
448 ret = _read_and_match_data_map(sbi, numdevs, dt);
449 if (unlikely(ret))
450 goto out;
451
452 if (likely(numdevs > 1)) {
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200453 unsigned size = numdevs * sizeof(sbi->layout.s_ods[0]);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200454
455 sbi = krealloc(sbi, sizeof(*sbi) + size, GFP_KERNEL);
456 if (unlikely(!sbi)) {
457 ret = -ENOMEM;
458 goto out;
459 }
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200460 memset(&sbi->layout.s_ods[1], 0,
461 size - sizeof(sbi->layout.s_ods[0]));
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200462 *psbi = sbi;
463 }
464
465 for (i = 0; i < numdevs; i++) {
466 struct exofs_fscb fscb;
467 struct osd_dev_info odi;
468 struct osd_dev *od;
469
470 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
471 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
472 ret = -EINVAL;
473 goto out;
474 }
475
476 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
477 i, odi.osdname);
478
479 /* On all devices the device table is identical. The user can
480 * specify any one of the participating devices on the command
481 * line. We always keep them in device-table order.
482 */
483 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200484 sbi->layout.s_ods[i] = fscb_od;
485 ++sbi->layout.s_numdevs;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200486 fscb_od = NULL;
487 continue;
488 }
489
490 od = osduld_info_lookup(&odi);
491 if (unlikely(IS_ERR(od))) {
492 ret = PTR_ERR(od);
493 EXOFS_ERR("ERROR: device requested is not found "
494 "osd_name-%s =>%d\n", odi.osdname, ret);
495 goto out;
496 }
497
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200498 sbi->layout.s_ods[i] = od;
499 ++sbi->layout.s_numdevs;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200500
501 /* Read the fscb of the other devices to make sure the FS
502 * partition is there.
503 */
504 ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb,
505 sizeof(fscb));
506 if (unlikely(ret)) {
507 EXOFS_ERR("ERROR: Malformed participating device "
508 "error reading fscb osd_name-%s\n",
509 odi.osdname);
510 goto out;
511 }
512
513 /* TODO: verify other information is correct and FS-uuid
514 * matches. Benny what did you say about device table
515 * generation and old devices?
516 */
517 }
518
519out:
520 kfree(dt);
521 if (unlikely(!ret && fscb_od)) {
522 EXOFS_ERR(
523 "ERROR: Bad device-table container device not present\n");
524 osduld_put_device(fscb_od);
525 ret = -EINVAL;
526 }
527
528 return ret;
529}
530
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200531/*
532 * Read the superblock from the OSD and fill in the fields
533 */
534static int exofs_fill_super(struct super_block *sb, void *data, int silent)
535{
536 struct inode *root;
537 struct exofs_mountopt *opts = data;
538 struct exofs_sb_info *sbi; /*extended info */
Boaz Harrosh06886a52009-11-08 14:54:08 +0200539 struct osd_dev *od; /* Master device */
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200540 struct exofs_fscb fscb; /*on-disk superblock info */
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200541 struct osd_obj_id obj;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200542 unsigned table_count;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200543 int ret;
544
545 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
546 if (!sbi)
547 return -ENOMEM;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200548
Jens Axboeb3d0ab72010-04-22 12:26:04 +0200549 ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
550 if (ret)
551 goto free_bdi;
552
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200553 /* use mount options to fill superblock */
Boaz Harrosh06886a52009-11-08 14:54:08 +0200554 od = osduld_path_lookup(opts->dev_name);
555 if (IS_ERR(od)) {
556 ret = PTR_ERR(od);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200557 goto free_sbi;
558 }
559
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200560 /* Default layout in case we do not have a device-table */
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200561 sbi->layout.stripe_unit = PAGE_SIZE;
562 sbi->layout.mirrors_p1 = 1;
563 sbi->layout.group_width = 1;
Boaz Harrosh50a76fd2010-02-11 13:01:39 +0200564 sbi->layout.group_depth = -1;
565 sbi->layout.group_count = 1;
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200566 sbi->layout.s_ods[0] = od;
567 sbi->layout.s_numdevs = 1;
568 sbi->layout.s_pid = opts->pid;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200569 sbi->s_timeout = opts->timeout;
570
571 /* fill in some other data by hand */
572 memset(sb->s_id, 0, sizeof(sb->s_id));
573 strcpy(sb->s_id, "exofs");
574 sb->s_blocksize = EXOFS_BLKSIZE;
575 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
576 sb->s_maxbytes = MAX_LFS_FILESIZE;
577 atomic_set(&sbi->s_curr_pending, 0);
578 sb->s_bdev = NULL;
579 sb->s_dev = 0;
580
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200581 obj.partition = sbi->layout.s_pid;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200582 obj.id = EXOFS_SUPER_ID;
583 exofs_make_credential(sbi->s_cred, &obj);
584
Boaz Harrosh06886a52009-11-08 14:54:08 +0200585 ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, sizeof(fscb));
586 if (unlikely(ret))
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200587 goto free_sbi;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200588
589 sb->s_magic = le16_to_cpu(fscb.s_magic);
590 sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
591 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
592
593 /* make sure what we read from the object store is correct */
594 if (sb->s_magic != EXOFS_SUPER_MAGIC) {
595 if (!silent)
596 EXOFS_ERR("ERROR: Bad magic value\n");
597 ret = -EINVAL;
598 goto free_sbi;
599 }
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200600 if (le32_to_cpu(fscb.s_version) != EXOFS_FSCB_VER) {
601 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
602 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
603 ret = -EINVAL;
604 goto free_sbi;
605 }
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200606
607 /* start generation numbers from a random point */
608 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
609 spin_lock_init(&sbi->s_next_gen_lock);
610
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200611 table_count = le64_to_cpu(fscb.s_dev_table_count);
612 if (table_count) {
613 ret = exofs_read_lookup_dev_table(&sbi, table_count);
614 if (unlikely(ret))
615 goto free_sbi;
616 }
617
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200618 /* set up operation vectors */
Jens Axboeb3d0ab72010-04-22 12:26:04 +0200619 sb->s_bdi = &sbi->bdi;
Boaz Harrosh06886a52009-11-08 14:54:08 +0200620 sb->s_fs_info = sbi;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200621 sb->s_op = &exofs_sops;
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200622 sb->s_export_op = &exofs_export_ops;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200623 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
624 if (IS_ERR(root)) {
625 EXOFS_ERR("ERROR: exofs_iget failed\n");
626 ret = PTR_ERR(root);
627 goto free_sbi;
628 }
629 sb->s_root = d_alloc_root(root);
630 if (!sb->s_root) {
631 iput(root);
632 EXOFS_ERR("ERROR: get root inode failed\n");
633 ret = -ENOMEM;
634 goto free_sbi;
635 }
636
637 if (!S_ISDIR(root->i_mode)) {
638 dput(sb->s_root);
639 sb->s_root = NULL;
640 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
641 root->i_mode);
642 ret = -EINVAL;
643 goto free_sbi;
644 }
645
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200646 _exofs_print_device("Mounting", opts->dev_name, sbi->layout.s_ods[0],
647 sbi->layout.s_pid);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200648 return 0;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200649
650free_sbi:
Jens Axboeb3d0ab72010-04-22 12:26:04 +0200651 bdi_destroy(&sbi->bdi);
652free_bdi:
Boaz Harrosh06886a52009-11-08 14:54:08 +0200653 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200654 opts->dev_name, sbi->layout.s_pid, ret);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200655 exofs_free_sbi(sbi);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200656 return ret;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200657}
658
659/*
660 * Set up the superblock (calls exofs_fill_super eventually)
661 */
Al Viro3c26ff62010-07-25 11:46:36 +0400662static struct dentry *exofs_mount(struct file_system_type *type,
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200663 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +0400664 void *data)
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200665{
666 struct exofs_mountopt opts;
667 int ret;
668
669 ret = parse_options(data, &opts);
670 if (ret)
Al Viro3c26ff62010-07-25 11:46:36 +0400671 return ERR_PTR(ret);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200672
673 opts.dev_name = dev_name;
Al Viro3c26ff62010-07-25 11:46:36 +0400674 return mount_nodev(type, flags, &opts, exofs_fill_super);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200675}
676
677/*
678 * Return information about the file system state in the buffer. This is used
679 * by the 'df' command, for example.
680 */
681static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
682{
683 struct super_block *sb = dentry->d_sb;
684 struct exofs_sb_info *sbi = sb->s_fs_info;
Boaz Harrosh06886a52009-11-08 14:54:08 +0200685 struct exofs_io_state *ios;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200686 struct osd_attr attrs[] = {
687 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
688 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
689 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
690 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
691 };
692 uint64_t capacity = ULLONG_MAX;
693 uint64_t used = ULLONG_MAX;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200694 uint8_t cred_a[OSD_CAP_LEN];
695 int ret;
696
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200697 ret = exofs_get_io_state(&sbi->layout, &ios);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200698 if (ret) {
699 EXOFS_DBGMSG("exofs_get_io_state failed.\n");
700 return ret;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200701 }
702
Boaz Harrosh06886a52009-11-08 14:54:08 +0200703 exofs_make_credential(cred_a, &ios->obj);
704 ios->cred = sbi->s_cred;
705 ios->in_attr = attrs;
706 ios->in_attr_len = ARRAY_SIZE(attrs);
707
708 ret = exofs_sbi_read(ios);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200709 if (unlikely(ret))
710 goto out;
711
Boaz Harrosh06886a52009-11-08 14:54:08 +0200712 ret = extract_attr_from_ios(ios, &attrs[0]);
Boaz Harroshcae012d2009-11-02 18:19:24 +0200713 if (likely(!ret)) {
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200714 capacity = get_unaligned_be64(attrs[0].val_ptr);
Boaz Harroshcae012d2009-11-02 18:19:24 +0200715 if (unlikely(!capacity))
716 capacity = ULLONG_MAX;
717 } else
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200718 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
719
Boaz Harrosh06886a52009-11-08 14:54:08 +0200720 ret = extract_attr_from_ios(ios, &attrs[1]);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200721 if (likely(!ret))
722 used = get_unaligned_be64(attrs[1].val_ptr);
723 else
724 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
725
726 /* fill in the stats buffer */
727 buf->f_type = EXOFS_SUPER_MAGIC;
728 buf->f_bsize = EXOFS_BLKSIZE;
Boaz Harroshcae012d2009-11-02 18:19:24 +0200729 buf->f_blocks = capacity >> 9;
730 buf->f_bfree = (capacity - used) >> 9;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200731 buf->f_bavail = buf->f_bfree;
732 buf->f_files = sbi->s_numfiles;
733 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
734 buf->f_namelen = EXOFS_NAME_LEN;
735
736out:
Boaz Harrosh06886a52009-11-08 14:54:08 +0200737 exofs_put_io_state(ios);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200738 return ret;
739}
740
741static const struct super_operations exofs_sops = {
742 .alloc_inode = exofs_alloc_inode,
743 .destroy_inode = exofs_destroy_inode,
744 .write_inode = exofs_write_inode,
Al Viro4ec70c92010-06-07 11:42:26 -0400745 .evict_inode = exofs_evict_inode,
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200746 .put_super = exofs_put_super,
747 .write_super = exofs_write_super,
Christoph Hellwig80e09fb2009-06-08 10:03:58 +0200748 .sync_fs = exofs_sync_fs,
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200749 .statfs = exofs_statfs,
750};
751
752/******************************************************************************
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200753 * EXPORT OPERATIONS
754 *****************************************************************************/
755
756struct dentry *exofs_get_parent(struct dentry *child)
757{
758 unsigned long ino = exofs_parent_ino(child);
759
760 if (!ino)
761 return NULL;
762
763 return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
764}
765
766static struct inode *exofs_nfs_get_inode(struct super_block *sb,
767 u64 ino, u32 generation)
768{
769 struct inode *inode;
770
771 inode = exofs_iget(sb, ino);
772 if (IS_ERR(inode))
773 return ERR_CAST(inode);
774 if (generation && inode->i_generation != generation) {
775 /* we didn't find the right inode.. */
776 iput(inode);
777 return ERR_PTR(-ESTALE);
778 }
779 return inode;
780}
781
782static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
783 struct fid *fid, int fh_len, int fh_type)
784{
785 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
786 exofs_nfs_get_inode);
787}
788
789static struct dentry *exofs_fh_to_parent(struct super_block *sb,
790 struct fid *fid, int fh_len, int fh_type)
791{
792 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
793 exofs_nfs_get_inode);
794}
795
796static const struct export_operations exofs_export_ops = {
797 .fh_to_dentry = exofs_fh_to_dentry,
798 .fh_to_parent = exofs_fh_to_parent,
799 .get_parent = exofs_get_parent,
800};
801
802/******************************************************************************
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200803 * INSMOD/RMMOD
804 *****************************************************************************/
805
806/*
807 * struct that describes this file system
808 */
809static struct file_system_type exofs_type = {
810 .owner = THIS_MODULE,
811 .name = "exofs",
Al Viro3c26ff62010-07-25 11:46:36 +0400812 .mount = exofs_mount,
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200813 .kill_sb = generic_shutdown_super,
814};
815
816static int __init init_exofs(void)
817{
818 int err;
819
820 err = init_inodecache();
821 if (err)
822 goto out;
823
824 err = register_filesystem(&exofs_type);
825 if (err)
826 goto out_d;
827
828 return 0;
829out_d:
830 destroy_inodecache();
831out:
832 return err;
833}
834
835static void __exit exit_exofs(void)
836{
837 unregister_filesystem(&exofs_type);
838 destroy_inodecache();
839}
840
841MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
842MODULE_DESCRIPTION("exofs");
843MODULE_LICENSE("GPL");
844
845module_init(init_exofs)
846module_exit(exit_exofs)