blob: e6085ec192d665ef2182625b1b4e0b1ccdb3e3d5 [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>
Paul Gortmaker143cb492011-07-01 14:23:34 -040038#include <linux/module.h>
Boaz Harrosh8cf74b32009-03-22 12:47:26 +020039#include <linux/exportfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Boaz Harroshba9e5e92008-10-28 16:11:41 +020041
42#include "exofs.h"
43
Boaz Harrosh85e44df2011-05-16 15:26:47 +030044#define EXOFS_DBGMSG2(M...) do {} while (0)
45
Boaz Harroshba9e5e92008-10-28 16:11:41 +020046/******************************************************************************
47 * MOUNT OPTIONS
48 *****************************************************************************/
49
50/*
51 * struct to hold what we get from mount options
52 */
53struct exofs_mountopt {
Boaz Harrosh9ed96482011-01-31 14:32:14 +020054 bool is_osdname;
Boaz Harroshba9e5e92008-10-28 16:11:41 +020055 const char *dev_name;
56 uint64_t pid;
57 int timeout;
58};
59
60/*
61 * exofs-specific mount-time options.
62 */
Boaz Harrosh9ed96482011-01-31 14:32:14 +020063enum { Opt_name, Opt_pid, Opt_to, Opt_err };
Boaz Harroshba9e5e92008-10-28 16:11:41 +020064
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 */
70static match_table_t tokens = {
Boaz Harrosh9ed96482011-01-31 14:32:14 +020071 {Opt_name, "osdname=%s"},
Boaz Harroshba9e5e92008-10-28 16:11:41 +020072 {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 */
81static 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) {
Boaz Harrosh9ed96482011-01-31 14:32:14 +0200102 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;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200110 case Opt_pid:
111 if (0 == match_strlcpy(str, &args[0], sizeof(str)))
112 return -EINVAL;
113 opts->pid = simple_strtoull(str, NULL, 0);
114 if (opts->pid < EXOFS_MIN_PID) {
115 EXOFS_ERR("Partition ID must be >= %u",
116 EXOFS_MIN_PID);
117 return -EINVAL;
118 }
119 s_pid = 1;
120 break;
121 case Opt_to:
122 if (match_int(&args[0], &option))
123 return -EINVAL;
124 if (option <= 0) {
125 EXOFS_ERR("Timout must be > 0");
126 return -EINVAL;
127 }
128 opts->timeout = option * HZ;
129 break;
130 }
131 }
132
133 if (!s_pid) {
134 EXOFS_ERR("Need to specify the following options:\n");
135 EXOFS_ERR(" -o pid=pid_no_to_use\n");
136 return -EINVAL;
137 }
138
139 return 0;
140}
141
142/******************************************************************************
143 * INODE CACHE
144 *****************************************************************************/
145
146/*
147 * Our inode cache. Isn't it pretty?
148 */
149static struct kmem_cache *exofs_inode_cachep;
150
151/*
152 * Allocate an inode in the cache
153 */
154static 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
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100166static void exofs_i_callback(struct rcu_head *head)
167{
168 struct inode *inode = container_of(head, struct inode, i_rcu);
169 INIT_LIST_HEAD(&inode->i_dentry);
170 kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
171}
172
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200173/*
174 * Remove an inode from the cache
175 */
176static void exofs_destroy_inode(struct inode *inode)
177{
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100178 call_rcu(&inode->i_rcu, exofs_i_callback);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200179}
180
181/*
182 * Initialize the inode
183 */
184static 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 */
194static 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 exofs_init_once);
200 if (exofs_inode_cachep == NULL)
201 return -ENOMEM;
202 return 0;
203}
204
205/*
206 * Destroy the inode cache
207 */
208static void destroy_inodecache(void)
209{
210 kmem_cache_destroy(exofs_inode_cachep);
211}
212
213/******************************************************************************
Boaz Harrosh85e44df2011-05-16 15:26:47 +0300214 * Some osd helpers
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200215 *****************************************************************************/
Boaz Harrosh85e44df2011-05-16 15:26:47 +0300216void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
217{
218 osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
219}
220
221static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
222 u64 offset, void *p, unsigned length)
223{
224 struct osd_request *or = osd_start_request(od, GFP_KERNEL);
225/* struct osd_sense_info osi = {.key = 0};*/
226 int ret;
227
228 if (unlikely(!or)) {
229 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
230 return -ENOMEM;
231 }
232 ret = osd_req_read_kern(or, obj, offset, p, length);
233 if (unlikely(ret)) {
234 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
235 goto out;
236 }
237
238 ret = osd_finalize_request(or, 0, cred, NULL);
239 if (unlikely(ret)) {
240 EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret);
241 goto out;
242 }
243
244 ret = osd_execute_request(or);
245 if (unlikely(ret))
246 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
247 /* osd_req_decode_sense(or, ret); */
248
249out:
250 osd_end_request(or);
251 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
252 "length=0x%llx dev=%p ret=>%d\n",
253 _LLU(obj->id), _LLU(offset), _LLU(length), od, ret);
254 return ret;
255}
256
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200257static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
258 EXOFS_APAGE_SB_DATA,
259 EXOFS_ATTR_SB_STATS,
260 sizeof(struct exofs_sb_stats));
261
262static int __sbi_read_stats(struct exofs_sb_info *sbi)
263{
264 struct osd_attr attrs[] = {
265 [0] = g_attr_sb_stats,
266 };
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700267 struct ore_io_state *ios;
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200268 int ret;
269
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300270 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200271 if (unlikely(ret)) {
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700272 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200273 return ret;
274 }
275
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200276 ios->in_attr = attrs;
277 ios->in_attr_len = ARRAY_SIZE(attrs);
278
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700279 ret = ore_read(ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200280 if (unlikely(ret)) {
281 EXOFS_ERR("Error reading super_block stats => %d\n", ret);
282 goto out;
283 }
284
285 ret = extract_attr_from_ios(ios, &attrs[0]);
286 if (ret) {
287 EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
288 goto out;
289 }
290 if (attrs[0].len) {
291 struct exofs_sb_stats *ess;
292
293 if (unlikely(attrs[0].len != sizeof(*ess))) {
294 EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
295 "size(%d) != expected(%zd)\n",
296 __func__, attrs[0].len, sizeof(*ess));
297 goto out;
298 }
299
300 ess = attrs[0].val_ptr;
301 sbi->s_nextid = le64_to_cpu(ess->s_nextid);
302 sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
303 }
304
305out:
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700306 ore_put_io_state(ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200307 return ret;
308}
309
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700310static void stats_done(struct ore_io_state *ios, void *p)
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200311{
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700312 ore_put_io_state(ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200313 /* Good thanks nothing to do anymore */
314}
315
316/* Asynchronously write the stats attribute */
317int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
318{
319 struct osd_attr attrs[] = {
320 [0] = g_attr_sb_stats,
321 };
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700322 struct ore_io_state *ios;
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200323 int ret;
324
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300325 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200326 if (unlikely(ret)) {
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700327 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200328 return ret;
329 }
330
331 sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid);
332 sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
333 attrs[0].val_ptr = &sbi->s_ess;
334
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700335
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200336 ios->done = stats_done;
337 ios->private = sbi;
338 ios->out_attr = attrs;
339 ios->out_attr_len = ARRAY_SIZE(attrs);
340
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700341 ret = ore_write(ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200342 if (unlikely(ret)) {
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700343 EXOFS_ERR("%s: ore_write failed.\n", __func__);
344 ore_put_io_state(ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200345 }
346
347 return ret;
348}
349
Boaz Harrosh85e44df2011-05-16 15:26:47 +0300350/******************************************************************************
351 * SUPERBLOCK FUNCTIONS
352 *****************************************************************************/
353static const struct super_operations exofs_sops;
354static const struct export_operations exofs_export_ops;
355
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200356/*
357 * Write the superblock to the OSD
358 */
H Hartley Sweetende74b052011-09-23 13:46:51 -0700359static int exofs_sync_fs(struct super_block *sb, int wait)
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200360{
361 struct exofs_sb_info *sbi;
362 struct exofs_fscb *fscb;
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700363 struct ore_comp one_comp;
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300364 struct ore_components oc;
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700365 struct ore_io_state *ios;
Christoph Hellwig80e09fb2009-06-08 10:03:58 +0200366 int ret = -ENOMEM;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200367
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200368 fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
369 if (unlikely(!fscb))
370 return -ENOMEM;
Boaz Harrosh06886a52009-11-08 14:54:08 +0200371
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200372 sbi = sb->s_fs_info;
373
374 /* NOTE: We no longer dirty the super_block anywhere in exofs. The
375 * reason we write the fscb here on unmount is so we can stay backwards
376 * compatible with fscb->s_version == 1. (What we are not compatible
377 * with is if a new version FS crashed and then we try to mount an old
378 * version). Otherwise the exofs_fscb is read-only from mkfs time. All
379 * the writeable info is set in exofs_sbi_write_stats() above.
380 */
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700381
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300382 exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID);
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700383
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300384 ret = ore_get_io_state(&sbi->layout, &oc, &ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200385 if (unlikely(ret))
Boaz Harrosh06886a52009-11-08 14:54:08 +0200386 goto out;
387
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200388 lock_super(sb);
389
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200390 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200391 memset(fscb, 0, ios->length);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200392 fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
393 fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
394 fscb->s_magic = cpu_to_le16(sb->s_magic);
395 fscb->s_newfs = 0;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200396 fscb->s_version = EXOFS_FSCB_VER;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200397
Boaz Harrosh06886a52009-11-08 14:54:08 +0200398 ios->offset = 0;
399 ios->kern_buff = fscb;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200400
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700401 ret = ore_write(ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200402 if (unlikely(ret))
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700403 EXOFS_ERR("%s: ore_write failed.\n", __func__);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200404 else
405 sb->s_dirt = 0;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200406
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200407
408 unlock_super(sb);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200409out:
Boaz Harrosh06886a52009-11-08 14:54:08 +0200410 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700411 ore_put_io_state(ios);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200412 kfree(fscb);
Christoph Hellwig80e09fb2009-06-08 10:03:58 +0200413 return ret;
414}
415
416static void exofs_write_super(struct super_block *sb)
417{
418 if (!(sb->s_flags & MS_RDONLY))
419 exofs_sync_fs(sb, 1);
420 else
421 sb->s_dirt = 0;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200422}
423
Boaz Harrosh19fe2942009-09-03 20:38:02 +0300424static void _exofs_print_device(const char *msg, const char *dev_path,
425 struct osd_dev *od, u64 pid)
426{
427 const struct osd_dev_info *odi = osduld_device_info(od);
428
429 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
430 msg, dev_path ?: "", odi->osdname, _LLU(pid));
431}
432
H Hartley Sweetende74b052011-09-23 13:46:51 -0700433static void exofs_free_sbi(struct exofs_sb_info *sbi)
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200434{
Boaz Harroshd866d872011-09-28 14:43:09 +0300435 unsigned numdevs = sbi->oc.numdevs;
436
437 while (numdevs) {
438 unsigned i = --numdevs;
439 struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200440
441 if (od) {
Boaz Harroshd866d872011-09-28 14:43:09 +0300442 ore_comp_set_dev(&sbi->oc, i, NULL);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200443 osduld_put_device(od);
444 }
445 }
Boaz Harroshd866d872011-09-28 14:43:09 +0300446 kfree(sbi->oc.ods);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200447 kfree(sbi);
448}
449
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200450/*
451 * This function is called when the vfs is freeing the superblock. We just
452 * need to free our own part.
453 */
454static void exofs_put_super(struct super_block *sb)
455{
456 int num_pend;
457 struct exofs_sb_info *sbi = sb->s_fs_info;
458
459 /* make sure there are no pending commands */
460 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
461 num_pend = atomic_read(&sbi->s_curr_pending)) {
462 wait_queue_head_t wq;
Boaz Harrosha49fb4c2011-02-07 18:12:15 +0200463
464 printk(KERN_NOTICE "%s: !!Pending operations in flight. "
465 "This is a BUG. please report to osd-dev@open-osd.org\n",
466 __func__);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200467 init_waitqueue_head(&wq);
468 wait_event_timeout(wq,
469 (atomic_read(&sbi->s_curr_pending) == 0),
470 msecs_to_jiffies(100));
471 }
472
Boaz Harroshd866d872011-09-28 14:43:09 +0300473 _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700474 sbi->one_comp.obj.partition);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200475
Jens Axboeb3d0ab72010-04-22 12:26:04 +0200476 bdi_destroy(&sbi->bdi);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200477 exofs_free_sbi(sbi);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200478 sb->s_fs_info = NULL;
479}
480
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200481static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
482 struct exofs_device_table *dt)
483{
Boaz Harrosh5a51c0c2011-09-28 13:18:45 +0300484 int ret;
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200485
Boaz Harrosh8d2d83a2011-08-10 14:15:02 -0700486 sbi->layout.stripe_unit =
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200487 le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
Boaz Harrosh8d2d83a2011-08-10 14:15:02 -0700488 sbi->layout.group_width =
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200489 le32_to_cpu(dt->dt_data_map.cb_group_width);
Boaz Harrosh8d2d83a2011-08-10 14:15:02 -0700490 sbi->layout.group_depth =
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200491 le32_to_cpu(dt->dt_data_map.cb_group_depth);
Boaz Harrosh8d2d83a2011-08-10 14:15:02 -0700492 sbi->layout.mirrors_p1 =
493 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;
494 sbi->layout.raid_algorithm =
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200495 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
496
Boaz Harrosh5a51c0c2011-09-28 13:18:45 +0300497 ret = ore_verify_layout(numdevs, &sbi->layout);
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200498
Boaz Harrosh6d4073e2011-07-27 17:51:53 -0700499 EXOFS_DBGMSG("exofs: layout: "
500 "num_comps=%u stripe_unit=0x%x group_width=%u "
501 "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n",
502 numdevs,
503 sbi->layout.stripe_unit,
504 sbi->layout.group_width,
505 _LLU(sbi->layout.group_depth),
506 sbi->layout.mirrors_p1,
Boaz Harrosh8d2d83a2011-08-10 14:15:02 -0700507 sbi->layout.raid_algorithm);
Boaz Harrosh5a51c0c2011-09-28 13:18:45 +0300508 return ret;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200509}
510
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700511static unsigned __ra_pages(struct ore_layout *layout)
bharrosh@panasas.com66cd6ca2010-10-07 14:28:18 -0400512{
513 const unsigned _MIN_RA = 32; /* min 128K read-ahead */
514 unsigned ra_pages = layout->group_width * layout->stripe_unit /
515 PAGE_SIZE;
516 unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
517
518 ra_pages *= 2; /* two stripes */
519 if (ra_pages < _MIN_RA)
520 ra_pages = roundup(_MIN_RA, ra_pages / 2);
521
522 if (ra_pages > max_io_pages)
523 ra_pages = max_io_pages;
524
525 return ra_pages;
526}
527
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200528/* @odi is valid only as long as @fscb_dev is valid */
529static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
530 struct osd_dev_info *odi)
531{
532 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
533 memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len);
534
535 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
536 odi->osdname = dt_dev->osdname;
537
538 /* FIXME support long names. Will need a _put function */
539 if (dt_dev->long_name_offset)
540 return -EINVAL;
541
542 /* Make sure osdname is printable!
543 * mkexofs should give us space for a null-terminator else the
544 * device-table is invalid.
545 */
546 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
547 odi->osdname_len = sizeof(dt_dev->osdname) - 1;
548 dt_dev->osdname[odi->osdname_len] = 0;
549
550 /* If it's all zeros something is bad we read past end-of-obj */
551 return !(odi->systemid_len || odi->osdname_len);
552}
553
Boaz Harroshd866d872011-09-28 14:43:09 +0300554int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
555 struct exofs_dev **peds)
556{
557 struct __alloc_ore_devs_and_exofs_devs {
558 /* Twice bigger table: See exofs_init_comps() and comment at
559 * exofs_read_lookup_dev_table()
560 */
561 struct ore_dev *oreds[numdevs * 2 - 1];
562 struct exofs_dev eds[numdevs];
563 } *aoded;
564 struct exofs_dev *eds;
565 unsigned i;
566
567 aoded = kzalloc(sizeof(*aoded), GFP_KERNEL);
568 if (unlikely(!aoded)) {
569 EXOFS_ERR("ERROR: faild allocating Device array[%d]\n",
570 numdevs);
571 return -ENOMEM;
572 }
573
574 sbi->oc.ods = aoded->oreds;
575 *peds = eds = aoded->eds;
576 for (i = 0; i < numdevs; ++i)
577 aoded->oreds[i] = &eds[i].ored;
578 return 0;
579}
580
Boaz Harrosh6d4073e2011-07-27 17:51:53 -0700581static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
582 struct osd_dev *fscb_od,
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200583 unsigned table_count)
584{
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700585 struct ore_comp comp;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200586 struct exofs_device_table *dt;
Boaz Harroshd866d872011-09-28 14:43:09 +0300587 struct exofs_dev *eds;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200588 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
589 sizeof(*dt);
590 unsigned numdevs, i;
591 int ret;
592
593 dt = kmalloc(table_bytes, GFP_KERNEL);
594 if (unlikely(!dt)) {
595 EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
596 table_bytes);
597 return -ENOMEM;
598 }
599
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300600 sbi->oc.numdevs = 0;
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700601
602 comp.obj.partition = sbi->one_comp.obj.partition;
603 comp.obj.id = EXOFS_DEVTABLE_ID;
604 exofs_make_credential(comp.cred, &comp.obj);
605
606 ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt,
607 table_bytes);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200608 if (unlikely(ret)) {
609 EXOFS_ERR("ERROR: reading device table\n");
610 goto out;
611 }
612
613 numdevs = le64_to_cpu(dt->dt_num_devices);
614 if (unlikely(!numdevs)) {
615 ret = -EINVAL;
616 goto out;
617 }
618 WARN_ON(table_count != numdevs);
619
620 ret = _read_and_match_data_map(sbi, numdevs, dt);
621 if (unlikely(ret))
622 goto out;
623
Boaz Harroshd866d872011-09-28 14:43:09 +0300624 ret = __alloc_dev_table(sbi, numdevs, &eds);
625 if (unlikely(ret))
626 goto out;
627 /* exofs round-robins the device table view according to inode
628 * number. We hold a: twice bigger table hence inodes can point
629 * to any device and have a sequential view of the table
630 * starting at this device. See exofs_init_comps()
631 */
632 memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
633 (numdevs - 1) * sizeof(sbi->oc.ods[0]));
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200634
635 for (i = 0; i < numdevs; i++) {
636 struct exofs_fscb fscb;
637 struct osd_dev_info odi;
638 struct osd_dev *od;
639
640 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
641 EXOFS_ERR("ERROR: Read all-zeros device entry\n");
642 ret = -EINVAL;
643 goto out;
644 }
645
646 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
647 i, odi.osdname);
648
Boaz Harroshd866d872011-09-28 14:43:09 +0300649 /* the exofs id is currently the table index */
650 eds[i].did = i;
651
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200652 /* On all devices the device table is identical. The user can
653 * specify any one of the participating devices on the command
654 * line. We always keep them in device-table order.
655 */
656 if (fscb_od && osduld_device_same(fscb_od, &odi)) {
Boaz Harroshd866d872011-09-28 14:43:09 +0300657 eds[i].ored.od = fscb_od;
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300658 ++sbi->oc.numdevs;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200659 fscb_od = NULL;
660 continue;
661 }
662
663 od = osduld_info_lookup(&odi);
Tobias Klauser2c722c92010-12-09 15:55:21 +0100664 if (IS_ERR(od)) {
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200665 ret = PTR_ERR(od);
666 EXOFS_ERR("ERROR: device requested is not found "
667 "osd_name-%s =>%d\n", odi.osdname, ret);
668 goto out;
669 }
670
Boaz Harroshd866d872011-09-28 14:43:09 +0300671 eds[i].ored.od = od;
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300672 ++sbi->oc.numdevs;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200673
674 /* Read the fscb of the other devices to make sure the FS
675 * partition is there.
676 */
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700677 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200678 sizeof(fscb));
679 if (unlikely(ret)) {
680 EXOFS_ERR("ERROR: Malformed participating device "
681 "error reading fscb osd_name-%s\n",
682 odi.osdname);
683 goto out;
684 }
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
692out:
693 kfree(dt);
Boaz Harroshd866d872011-09-28 14:43:09 +0300694 if (unlikely(fscb_od && !ret)) {
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700695 EXOFS_ERR("ERROR: Bad device-table container device not present\n");
696 osduld_put_device(fscb_od);
697 return -EINVAL;
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700698 }
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200699 return ret;
700}
701
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200702/*
703 * Read the superblock from the OSD and fill in the fields
704 */
705static 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 */
Boaz Harrosh06886a52009-11-08 14:54:08 +0200710 struct osd_dev *od; /* Master device */
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200711 struct exofs_fscb fscb; /*on-disk superblock info */
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700712 struct ore_comp comp;
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200713 unsigned table_count;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200714 int ret;
715
716 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
717 if (!sbi)
718 return -ENOMEM;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200719
720 /* use mount options to fill superblock */
Boaz Harrosh9ed96482011-01-31 14:32:14 +0200721 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);
Boaz Harrosh9ce73042011-08-03 20:18:01 -0700727 kfree(opts->dev_name);
728 opts->dev_name = NULL;
Boaz Harrosh9ed96482011-01-31 14:32:14 +0200729 } else {
730 od = osduld_path_lookup(opts->dev_name);
731 }
Boaz Harrosh06886a52009-11-08 14:54:08 +0200732 if (IS_ERR(od)) {
Boaz Harrosh9ed96482011-01-31 14:32:14 +0200733 ret = -EINVAL;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200734 goto free_sbi;
735 }
736
Boaz Harrosh45d3abc2010-01-28 11:46:16 +0200737 /* Default layout in case we do not have a device-table */
Boaz Harrosh5d952b82010-02-01 13:35:51 +0200738 sbi->layout.stripe_unit = PAGE_SIZE;
739 sbi->layout.mirrors_p1 = 1;
740 sbi->layout.group_width = 1;
Boaz Harrosh50a76fd2010-02-11 13:01:39 +0200741 sbi->layout.group_depth = -1;
742 sbi->layout.group_count = 1;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200743 sbi->s_timeout = opts->timeout;
744
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700745 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);
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300748 sbi->oc.numdevs = 1;
749 sbi->oc.single_comp = EC_SINGLE_COMP;
750 sbi->oc.comps = &sbi->one_comp;
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700751
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200752 /* fill in some other data by hand */
753 memset(sb->s_id, 0, sizeof(sb->s_id));
754 strcpy(sb->s_id, "exofs");
755 sb->s_blocksize = EXOFS_BLKSIZE;
756 sb->s_blocksize_bits = EXOFS_BLKSHIFT;
757 sb->s_maxbytes = MAX_LFS_FILESIZE;
758 atomic_set(&sbi->s_curr_pending, 0);
759 sb->s_bdev = NULL;
760 sb->s_dev = 0;
761
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700762 comp.obj.partition = sbi->one_comp.obj.partition;
763 comp.obj.id = EXOFS_SUPER_ID;
764 exofs_make_credential(comp.cred, &comp.obj);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200765
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700766 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
Boaz Harrosh06886a52009-11-08 14:54:08 +0200767 if (unlikely(ret))
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200768 goto free_sbi;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200769
770 sb->s_magic = le16_to_cpu(fscb.s_magic);
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200771 /* NOTE: we read below to be backward compatible with old versions */
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200772 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 }
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200782 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200783 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 }
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200788
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
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200793 table_count = le64_to_cpu(fscb.s_dev_table_count);
794 if (table_count) {
Boaz Harrosh6d4073e2011-07-27 17:51:53 -0700795 ret = exofs_read_lookup_dev_table(sbi, od, table_count);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200796 if (unlikely(ret))
797 goto free_sbi;
Boaz Harrosh6d4073e2011-07-27 17:51:53 -0700798 } else {
Boaz Harroshd866d872011-09-28 14:43:09 +0300799 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);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200806 }
807
Boaz Harrosh1cea3122011-02-03 17:53:25 +0200808 __sbi_read_stats(sbi);
809
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200810 /* set up operation vectors */
bharrosh@panasas.com66cd6ca2010-10-07 14:28:18 -0400811 sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
Jens Axboeb3d0ab72010-04-22 12:26:04 +0200812 sb->s_bdi = &sbi->bdi;
Boaz Harrosh06886a52009-11-08 14:54:08 +0200813 sb->s_fs_info = sbi;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200814 sb->s_op = &exofs_sops;
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200815 sb->s_export_op = &exofs_export_ops;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200816 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
817 if (IS_ERR(root)) {
818 EXOFS_ERR("ERROR: exofs_iget failed\n");
819 ret = PTR_ERR(root);
820 goto free_sbi;
821 }
822 sb->s_root = d_alloc_root(root);
823 if (!sb->s_root) {
824 iput(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
Boaz Harrosh6d4073e2011-07-27 17:51:53 -0700839 ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
840 if (ret) {
841 EXOFS_DBGMSG("Failed to bdi_setup_and_register\n");
842 goto free_sbi;
843 }
844
Boaz Harroshd866d872011-09-28 14:43:09 +0300845 _exofs_print_device("Mounting", opts->dev_name,
846 ore_comp_dev(&sbi->oc, 0),
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700847 sbi->one_comp.obj.partition);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200848 return 0;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200849
850free_sbi:
Boaz Harrosh06886a52009-11-08 14:54:08 +0200851 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
Boaz Harrosh9e9db452011-08-05 15:06:04 -0700852 opts->dev_name, sbi->one_comp.obj.partition, ret);
Boaz Harrosh04dc1e82009-11-16 16:03:05 +0200853 exofs_free_sbi(sbi);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200854 return ret;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200855}
856
857/*
858 * Set up the superblock (calls exofs_fill_super eventually)
859 */
Al Viro3c26ff62010-07-25 11:46:36 +0400860static struct dentry *exofs_mount(struct file_system_type *type,
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200861 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +0400862 void *data)
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200863{
864 struct exofs_mountopt opts;
865 int ret;
866
867 ret = parse_options(data, &opts);
868 if (ret)
Al Viro3c26ff62010-07-25 11:46:36 +0400869 return ERR_PTR(ret);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200870
Boaz Harrosh9ed96482011-01-31 14:32:14 +0200871 if (!opts.dev_name)
872 opts.dev_name = dev_name;
Al Viro3c26ff62010-07-25 11:46:36 +0400873 return mount_nodev(type, flags, &opts, exofs_fill_super);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200874}
875
876/*
877 * Return information about the file system state in the buffer. This is used
878 * by the 'df' command, for example.
879 */
880static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
881{
882 struct super_block *sb = dentry->d_sb;
883 struct exofs_sb_info *sbi = sb->s_fs_info;
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700884 struct ore_io_state *ios;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200885 struct osd_attr attrs[] = {
886 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
887 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
888 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
889 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
890 };
891 uint64_t capacity = ULLONG_MAX;
892 uint64_t used = ULLONG_MAX;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200893 int ret;
894
Boaz Harrosh5bf696d2011-09-28 11:39:59 +0300895 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
Boaz Harrosh06886a52009-11-08 14:54:08 +0200896 if (ret) {
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700897 EXOFS_DBGMSG("ore_get_io_state failed.\n");
Boaz Harrosh06886a52009-11-08 14:54:08 +0200898 return ret;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200899 }
900
Boaz Harrosh06886a52009-11-08 14:54:08 +0200901 ios->in_attr = attrs;
902 ios->in_attr_len = ARRAY_SIZE(attrs);
903
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700904 ret = ore_read(ios);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200905 if (unlikely(ret))
906 goto out;
907
Boaz Harrosh06886a52009-11-08 14:54:08 +0200908 ret = extract_attr_from_ios(ios, &attrs[0]);
Boaz Harroshcae012d2009-11-02 18:19:24 +0200909 if (likely(!ret)) {
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200910 capacity = get_unaligned_be64(attrs[0].val_ptr);
Boaz Harroshcae012d2009-11-02 18:19:24 +0200911 if (unlikely(!capacity))
912 capacity = ULLONG_MAX;
913 } else
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200914 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
915
Boaz Harrosh06886a52009-11-08 14:54:08 +0200916 ret = extract_attr_from_ios(ios, &attrs[1]);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200917 if (likely(!ret))
918 used = get_unaligned_be64(attrs[1].val_ptr);
919 else
920 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
921
922 /* fill in the stats buffer */
923 buf->f_type = EXOFS_SUPER_MAGIC;
924 buf->f_bsize = EXOFS_BLKSIZE;
Boaz Harroshcae012d2009-11-02 18:19:24 +0200925 buf->f_blocks = capacity >> 9;
926 buf->f_bfree = (capacity - used) >> 9;
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200927 buf->f_bavail = buf->f_bfree;
928 buf->f_files = sbi->s_numfiles;
929 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
930 buf->f_namelen = EXOFS_NAME_LEN;
931
932out:
Boaz Harrosh8ff660a2011-08-06 19:26:31 -0700933 ore_put_io_state(ios);
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200934 return ret;
935}
936
937static const struct super_operations exofs_sops = {
938 .alloc_inode = exofs_alloc_inode,
939 .destroy_inode = exofs_destroy_inode,
940 .write_inode = exofs_write_inode,
Al Viro4ec70c92010-06-07 11:42:26 -0400941 .evict_inode = exofs_evict_inode,
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200942 .put_super = exofs_put_super,
943 .write_super = exofs_write_super,
Christoph Hellwig80e09fb2009-06-08 10:03:58 +0200944 .sync_fs = exofs_sync_fs,
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200945 .statfs = exofs_statfs,
946};
947
948/******************************************************************************
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200949 * EXPORT OPERATIONS
950 *****************************************************************************/
951
H Hartley Sweetende74b052011-09-23 13:46:51 -0700952static struct dentry *exofs_get_parent(struct dentry *child)
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200953{
954 unsigned long ino = exofs_parent_ino(child);
955
956 if (!ino)
Al Viroa803b802011-07-08 20:56:55 -0400957 return ERR_PTR(-ESTALE);
Boaz Harrosh8cf74b32009-03-22 12:47:26 +0200958
959 return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
960}
961
962static struct inode *exofs_nfs_get_inode(struct super_block *sb,
963 u64 ino, u32 generation)
964{
965 struct inode *inode;
966
967 inode = exofs_iget(sb, ino);
968 if (IS_ERR(inode))
969 return ERR_CAST(inode);
970 if (generation && inode->i_generation != generation) {
971 /* we didn't find the right inode.. */
972 iput(inode);
973 return ERR_PTR(-ESTALE);
974 }
975 return inode;
976}
977
978static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
979 struct fid *fid, int fh_len, int fh_type)
980{
981 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
982 exofs_nfs_get_inode);
983}
984
985static struct dentry *exofs_fh_to_parent(struct super_block *sb,
986 struct fid *fid, int fh_len, int fh_type)
987{
988 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
989 exofs_nfs_get_inode);
990}
991
992static const struct export_operations exofs_export_ops = {
993 .fh_to_dentry = exofs_fh_to_dentry,
994 .fh_to_parent = exofs_fh_to_parent,
995 .get_parent = exofs_get_parent,
996};
997
998/******************************************************************************
Boaz Harroshba9e5e92008-10-28 16:11:41 +0200999 * INSMOD/RMMOD
1000 *****************************************************************************/
1001
1002/*
1003 * struct that describes this file system
1004 */
1005static struct file_system_type exofs_type = {
1006 .owner = THIS_MODULE,
1007 .name = "exofs",
Al Viro3c26ff62010-07-25 11:46:36 +04001008 .mount = exofs_mount,
Boaz Harroshba9e5e92008-10-28 16:11:41 +02001009 .kill_sb = generic_shutdown_super,
1010};
1011
1012static int __init init_exofs(void)
1013{
1014 int err;
1015
1016 err = init_inodecache();
1017 if (err)
1018 goto out;
1019
1020 err = register_filesystem(&exofs_type);
1021 if (err)
1022 goto out_d;
1023
1024 return 0;
1025out_d:
1026 destroy_inodecache();
1027out:
1028 return err;
1029}
1030
1031static void __exit exit_exofs(void)
1032{
1033 unregister_filesystem(&exofs_type);
1034 destroy_inodecache();
1035}
1036
1037MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
1038MODULE_DESCRIPTION("exofs");
1039MODULE_LICENSE("GPL");
1040
1041module_init(init_exofs)
1042module_exit(exit_exofs)