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7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/fs.h>
13#include <linux/errno.h>
14#include <linux/stat.h>
15#include <linux/nls.h>
16#include <linux/buffer_head.h>
17#include <linux/vfs.h>
18#include <linux/parser.h>
19#include <linux/namei.h>
20#include <linux/sched.h>
21
22#include "befs.h"
23#include "btree.h"
24#include "inode.h"
25#include "datastream.h"
26#include "super.h"
27#include "io.h"
28
29MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
30MODULE_AUTHOR("Will Dyson");
31MODULE_LICENSE("GPL");
32
33
34#define VFS_BLOCK_SIZE 512
35
36static int befs_readdir(struct file *, struct dir_context *);
37static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
38static int befs_readpage(struct file *file, struct page *page);
39static sector_t befs_bmap(struct address_space *mapping, sector_t block);
40static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int);
41static struct inode *befs_iget(struct super_block *, unsigned long);
42static struct inode *befs_alloc_inode(struct super_block *sb);
43static void befs_destroy_inode(struct inode *inode);
44static void befs_destroy_inodecache(void);
45static int befs_symlink_readpage(struct file *, struct page *);
46static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
47 char **out, int *out_len);
48static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
49 char **out, int *out_len);
50static void befs_put_super(struct super_block *);
51static int befs_remount(struct super_block *, int *, char *);
52static int befs_statfs(struct dentry *, struct kstatfs *);
53static int parse_options(char *, struct befs_mount_options *);
54
55static const struct super_operations befs_sops = {
56 .alloc_inode = befs_alloc_inode,
57 .destroy_inode = befs_destroy_inode,
58 .put_super = befs_put_super,
59 .statfs = befs_statfs,
60 .remount_fs = befs_remount,
61 .show_options = generic_show_options,
62};
63
64
65static struct kmem_cache *befs_inode_cachep;
66
67static const struct file_operations befs_dir_operations = {
68 .read = generic_read_dir,
69 .iterate_shared = befs_readdir,
70 .llseek = generic_file_llseek,
71};
72
73static const struct inode_operations befs_dir_inode_operations = {
74 .lookup = befs_lookup,
75};
76
77static const struct address_space_operations befs_aops = {
78 .readpage = befs_readpage,
79 .bmap = befs_bmap,
80};
81
82static const struct address_space_operations befs_symlink_aops = {
83 .readpage = befs_symlink_readpage,
84};
85
86
87
88
89
90
91
92
93static int
94befs_readpage(struct file *file, struct page *page)
95{
96 return block_read_full_page(page, befs_get_block);
97}
98
99static sector_t
100befs_bmap(struct address_space *mapping, sector_t block)
101{
102 return generic_block_bmap(mapping, block, befs_get_block);
103}
104
105
106
107
108
109
110
111
112
113
114
115
116static int
117befs_get_block(struct inode *inode, sector_t block,
118 struct buffer_head *bh_result, int create)
119{
120 struct super_block *sb = inode->i_sb;
121 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
122 befs_block_run run = BAD_IADDR;
123 int res;
124 ulong disk_off;
125
126 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
127 (unsigned long)inode->i_ino, (long)block);
128 if (create) {
129 befs_error(sb, "befs_get_block() was asked to write to "
130 "block %ld in inode %lu", (long)block,
131 (unsigned long)inode->i_ino);
132 return -EPERM;
133 }
134
135 res = befs_fblock2brun(sb, ds, block, &run);
136 if (res != BEFS_OK) {
137 befs_error(sb,
138 "<--- %s for inode %lu, block %ld ERROR",
139 __func__, (unsigned long)inode->i_ino,
140 (long)block);
141 return -EFBIG;
142 }
143
144 disk_off = (ulong) iaddr2blockno(sb, &run);
145
146 map_bh(bh_result, inode->i_sb, disk_off);
147
148 befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu",
149 __func__, (unsigned long)inode->i_ino, (long)block,
150 (unsigned long)disk_off);
151
152 return 0;
153}
154
155static struct dentry *
156befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
157{
158 struct inode *inode;
159 struct super_block *sb = dir->i_sb;
160 const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
161 befs_off_t offset;
162 int ret;
163 int utfnamelen;
164 char *utfname;
165 const char *name = dentry->d_name.name;
166
167 befs_debug(sb, "---> %s name %pd inode %ld", __func__,
168 dentry, dir->i_ino);
169
170
171 if (BEFS_SB(sb)->nls) {
172 ret =
173 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
174 if (ret < 0) {
175 befs_debug(sb, "<--- %s ERROR", __func__);
176 return ERR_PTR(ret);
177 }
178 ret = befs_btree_find(sb, ds, utfname, &offset);
179 kfree(utfname);
180
181 } else {
182 ret = befs_btree_find(sb, ds, name, &offset);
183 }
184
185 if (ret == BEFS_BT_NOT_FOUND) {
186 befs_debug(sb, "<--- %s %pd not found", __func__, dentry);
187 d_add(dentry, NULL);
188 return ERR_PTR(-ENOENT);
189
190 } else if (ret != BEFS_OK || offset == 0) {
191 befs_error(sb, "<--- %s Error", __func__);
192 return ERR_PTR(-ENODATA);
193 }
194
195 inode = befs_iget(dir->i_sb, (ino_t) offset);
196 if (IS_ERR(inode))
197 return ERR_CAST(inode);
198
199 d_add(dentry, inode);
200
201 befs_debug(sb, "<--- %s", __func__);
202
203 return NULL;
204}
205
206static int
207befs_readdir(struct file *file, struct dir_context *ctx)
208{
209 struct inode *inode = file_inode(file);
210 struct super_block *sb = inode->i_sb;
211 const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
212 befs_off_t value;
213 int result;
214 size_t keysize;
215 char keybuf[BEFS_NAME_LEN + 1];
216
217 befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
218 __func__, file, inode->i_ino, ctx->pos);
219
220 while (1) {
221 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
222 keybuf, &keysize, &value);
223
224 if (result == BEFS_ERR) {
225 befs_debug(sb, "<--- %s ERROR", __func__);
226 befs_error(sb, "IO error reading %pD (inode %lu)",
227 file, inode->i_ino);
228 return -EIO;
229
230 } else if (result == BEFS_BT_END) {
231 befs_debug(sb, "<--- %s END", __func__);
232 return 0;
233
234 } else if (result == BEFS_BT_EMPTY) {
235 befs_debug(sb, "<--- %s Empty directory", __func__);
236 return 0;
237 }
238
239
240 if (BEFS_SB(sb)->nls) {
241 char *nlsname;
242 int nlsnamelen;
243
244 result =
245 befs_utf2nls(sb, keybuf, keysize, &nlsname,
246 &nlsnamelen);
247 if (result < 0) {
248 befs_debug(sb, "<--- %s ERROR", __func__);
249 return result;
250 }
251 if (!dir_emit(ctx, nlsname, nlsnamelen,
252 (ino_t) value, DT_UNKNOWN)) {
253 kfree(nlsname);
254 return 0;
255 }
256 kfree(nlsname);
257 } else {
258 if (!dir_emit(ctx, keybuf, keysize,
259 (ino_t) value, DT_UNKNOWN))
260 return 0;
261 }
262 ctx->pos++;
263 }
264}
265
266static struct inode *
267befs_alloc_inode(struct super_block *sb)
268{
269 struct befs_inode_info *bi;
270
271 bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL);
272 if (!bi)
273 return NULL;
274 return &bi->vfs_inode;
275}
276
277static void befs_i_callback(struct rcu_head *head)
278{
279 struct inode *inode = container_of(head, struct inode, i_rcu);
280 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
281}
282
283static void befs_destroy_inode(struct inode *inode)
284{
285 call_rcu(&inode->i_rcu, befs_i_callback);
286}
287
288static void init_once(void *foo)
289{
290 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
291
292 inode_init_once(&bi->vfs_inode);
293}
294
295static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
296{
297 struct buffer_head *bh;
298 befs_inode *raw_inode;
299 struct befs_sb_info *befs_sb = BEFS_SB(sb);
300 struct befs_inode_info *befs_ino;
301 struct inode *inode;
302
303 befs_debug(sb, "---> %s inode = %lu", __func__, ino);
304
305 inode = iget_locked(sb, ino);
306 if (!inode)
307 return ERR_PTR(-ENOMEM);
308 if (!(inode->i_state & I_NEW))
309 return inode;
310
311 befs_ino = BEFS_I(inode);
312
313
314 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
315
316 befs_debug(sb, " real inode number [%u, %hu, %hu]",
317 befs_ino->i_inode_num.allocation_group,
318 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
319
320 bh = sb_bread(sb, inode->i_ino);
321 if (!bh) {
322 befs_error(sb, "unable to read inode block - "
323 "inode = %lu", inode->i_ino);
324 goto unacquire_none;
325 }
326
327 raw_inode = (befs_inode *) bh->b_data;
328
329 befs_dump_inode(sb, raw_inode);
330
331 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
332 befs_error(sb, "Bad inode: %lu", inode->i_ino);
333 goto unacquire_bh;
334 }
335
336 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
337
338
339
340
341
342
343 inode->i_uid = befs_sb->mount_opts.use_uid ?
344 befs_sb->mount_opts.uid :
345 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
346 inode->i_gid = befs_sb->mount_opts.use_gid ?
347 befs_sb->mount_opts.gid :
348 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
349
350 set_nlink(inode, 1);
351
352
353
354
355
356
357
358
359
360
361 inode->i_mtime.tv_sec =
362 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
363 inode->i_mtime.tv_nsec = 0;
364 inode->i_ctime = inode->i_mtime;
365 inode->i_atime = inode->i_mtime;
366
367 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
368 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
369 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
370 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
371
372 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
373 inode->i_size = 0;
374 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
375 strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
376 BEFS_SYMLINK_LEN);
377 } else {
378 int num_blks;
379
380 befs_ino->i_data.ds =
381 fsds_to_cpu(sb, &raw_inode->data.datastream);
382
383 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
384 inode->i_blocks =
385 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
386 inode->i_size = befs_ino->i_data.ds.size;
387 }
388
389 inode->i_mapping->a_ops = &befs_aops;
390
391 if (S_ISREG(inode->i_mode)) {
392 inode->i_fop = &generic_ro_fops;
393 } else if (S_ISDIR(inode->i_mode)) {
394 inode->i_op = &befs_dir_inode_operations;
395 inode->i_fop = &befs_dir_operations;
396 } else if (S_ISLNK(inode->i_mode)) {
397 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
398 inode->i_op = &page_symlink_inode_operations;
399 inode_nohighmem(inode);
400 inode->i_mapping->a_ops = &befs_symlink_aops;
401 } else {
402 inode->i_link = befs_ino->i_data.symlink;
403 inode->i_op = &simple_symlink_inode_operations;
404 }
405 } else {
406 befs_error(sb, "Inode %lu is not a regular file, "
407 "directory or symlink. THAT IS WRONG! BeFS has no "
408 "on disk special files", inode->i_ino);
409 goto unacquire_bh;
410 }
411
412 brelse(bh);
413 befs_debug(sb, "<--- %s", __func__);
414 unlock_new_inode(inode);
415 return inode;
416
417 unacquire_bh:
418 brelse(bh);
419
420 unacquire_none:
421 iget_failed(inode);
422 befs_debug(sb, "<--- %s - Bad inode", __func__);
423 return ERR_PTR(-EIO);
424}
425
426
427
428
429
430static int __init
431befs_init_inodecache(void)
432{
433 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
434 sizeof (struct befs_inode_info),
435 0, (SLAB_RECLAIM_ACCOUNT|
436 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
437 init_once);
438 if (befs_inode_cachep == NULL)
439 return -ENOMEM;
440
441 return 0;
442}
443
444
445
446
447
448static void
449befs_destroy_inodecache(void)
450{
451
452
453
454
455 rcu_barrier();
456 kmem_cache_destroy(befs_inode_cachep);
457}
458
459
460
461
462
463
464static int befs_symlink_readpage(struct file *unused, struct page *page)
465{
466 struct inode *inode = page->mapping->host;
467 struct super_block *sb = inode->i_sb;
468 struct befs_inode_info *befs_ino = BEFS_I(inode);
469 befs_data_stream *data = &befs_ino->i_data.ds;
470 befs_off_t len = data->size;
471 char *link = page_address(page);
472
473 if (len == 0 || len > PAGE_SIZE) {
474 befs_error(sb, "Long symlink with illegal length");
475 goto fail;
476 }
477 befs_debug(sb, "Follow long symlink");
478
479 if (befs_read_lsymlink(sb, data, link, len) != len) {
480 befs_error(sb, "Failed to read entire long symlink");
481 goto fail;
482 }
483 link[len - 1] = '\0';
484 SetPageUptodate(page);
485 unlock_page(page);
486 return 0;
487fail:
488 SetPageError(page);
489 unlock_page(page);
490 return -EIO;
491}
492
493
494
495
496
497
498
499
500
501static int
502befs_utf2nls(struct super_block *sb, const char *in,
503 int in_len, char **out, int *out_len)
504{
505 struct nls_table *nls = BEFS_SB(sb)->nls;
506 int i, o;
507 unicode_t uni;
508 int unilen, utflen;
509 char *result;
510
511
512
513
514 int maxlen = in_len + 1;
515
516 befs_debug(sb, "---> %s", __func__);
517
518 if (!nls) {
519 befs_error(sb, "%s called with no NLS table loaded", __func__);
520 return -EINVAL;
521 }
522
523 *out = result = kmalloc(maxlen, GFP_NOFS);
524 if (!*out) {
525 return -ENOMEM;
526 }
527
528 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
529
530
531 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
532 if (utflen < 0)
533 goto conv_err;
534
535
536 if (uni > MAX_WCHAR_T)
537 goto conv_err;
538 unilen = nls->uni2char(uni, &result[o], in_len - o);
539 if (unilen < 0)
540 goto conv_err;
541 }
542 result[o] = '\0';
543 *out_len = o;
544
545 befs_debug(sb, "<--- %s", __func__);
546
547 return o;
548
549 conv_err:
550 befs_error(sb, "Name using character set %s contains a character that "
551 "cannot be converted to unicode.", nls->charset);
552 befs_debug(sb, "<--- %s", __func__);
553 kfree(result);
554 return -EILSEQ;
555}
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579static int
580befs_nls2utf(struct super_block *sb, const char *in,
581 int in_len, char **out, int *out_len)
582{
583 struct nls_table *nls = BEFS_SB(sb)->nls;
584 int i, o;
585 wchar_t uni;
586 int unilen, utflen;
587 char *result;
588
589
590
591 int maxlen = (3 * in_len) + 1;
592
593 befs_debug(sb, "---> %s\n", __func__);
594
595 if (!nls) {
596 befs_error(sb, "%s called with no NLS table loaded.",
597 __func__);
598 return -EINVAL;
599 }
600
601 *out = result = kmalloc(maxlen, GFP_NOFS);
602 if (!*out) {
603 *out_len = 0;
604 return -ENOMEM;
605 }
606
607 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
608
609
610 unilen = nls->char2uni(&in[i], in_len - i, &uni);
611 if (unilen < 0)
612 goto conv_err;
613
614
615 utflen = utf32_to_utf8(uni, &result[o], 3);
616 if (utflen <= 0)
617 goto conv_err;
618 }
619
620 result[o] = '\0';
621 *out_len = o;
622
623 befs_debug(sb, "<--- %s", __func__);
624
625 return i;
626
627 conv_err:
628 befs_error(sb, "Name using charecter set %s contains a charecter that "
629 "cannot be converted to unicode.", nls->charset);
630 befs_debug(sb, "<--- %s", __func__);
631 kfree(result);
632 return -EILSEQ;
633}
634
635enum {
636 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
637};
638
639static const match_table_t befs_tokens = {
640 {Opt_uid, "uid=%d"},
641 {Opt_gid, "gid=%d"},
642 {Opt_charset, "iocharset=%s"},
643 {Opt_debug, "debug"},
644 {Opt_err, NULL}
645};
646
647static int
648parse_options(char *options, struct befs_mount_options *opts)
649{
650 char *p;
651 substring_t args[MAX_OPT_ARGS];
652 int option;
653 kuid_t uid;
654 kgid_t gid;
655
656
657 opts->uid = GLOBAL_ROOT_UID;
658 opts->gid = GLOBAL_ROOT_GID;
659 opts->use_uid = 0;
660 opts->use_gid = 0;
661 opts->iocharset = NULL;
662 opts->debug = 0;
663
664 if (!options)
665 return 1;
666
667 while ((p = strsep(&options, ",")) != NULL) {
668 int token;
669 if (!*p)
670 continue;
671
672 token = match_token(p, befs_tokens, args);
673 switch (token) {
674 case Opt_uid:
675 if (match_int(&args[0], &option))
676 return 0;
677 uid = INVALID_UID;
678 if (option >= 0)
679 uid = make_kuid(current_user_ns(), option);
680 if (!uid_valid(uid)) {
681 pr_err("Invalid uid %d, "
682 "using default\n", option);
683 break;
684 }
685 opts->uid = uid;
686 opts->use_uid = 1;
687 break;
688 case Opt_gid:
689 if (match_int(&args[0], &option))
690 return 0;
691 gid = INVALID_GID;
692 if (option >= 0)
693 gid = make_kgid(current_user_ns(), option);
694 if (!gid_valid(gid)) {
695 pr_err("Invalid gid %d, "
696 "using default\n", option);
697 break;
698 }
699 opts->gid = gid;
700 opts->use_gid = 1;
701 break;
702 case Opt_charset:
703 kfree(opts->iocharset);
704 opts->iocharset = match_strdup(&args[0]);
705 if (!opts->iocharset) {
706 pr_err("allocation failure for "
707 "iocharset string\n");
708 return 0;
709 }
710 break;
711 case Opt_debug:
712 opts->debug = 1;
713 break;
714 default:
715 pr_err("Unrecognized mount option \"%s\" "
716 "or missing value\n", p);
717 return 0;
718 }
719 }
720 return 1;
721}
722
723
724
725
726
727
728static void
729befs_put_super(struct super_block *sb)
730{
731 kfree(BEFS_SB(sb)->mount_opts.iocharset);
732 BEFS_SB(sb)->mount_opts.iocharset = NULL;
733 unload_nls(BEFS_SB(sb)->nls);
734 kfree(sb->s_fs_info);
735 sb->s_fs_info = NULL;
736}
737
738
739
740
741
742
743
744static int
745befs_fill_super(struct super_block *sb, void *data, int silent)
746{
747 struct buffer_head *bh;
748 struct befs_sb_info *befs_sb;
749 befs_super_block *disk_sb;
750 struct inode *root;
751 long ret = -EINVAL;
752 const unsigned long sb_block = 0;
753 const off_t x86_sb_off = 512;
754 int blocksize;
755
756 save_mount_options(sb, data);
757
758 sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
759 if (sb->s_fs_info == NULL)
760 goto unacquire_none;
761
762 befs_sb = BEFS_SB(sb);
763
764 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
765 if (!silent)
766 befs_error(sb, "cannot parse mount options");
767 goto unacquire_priv_sbp;
768 }
769
770 befs_debug(sb, "---> %s", __func__);
771
772 if (!(sb->s_flags & MS_RDONLY)) {
773 befs_warning(sb,
774 "No write support. Marking filesystem read-only");
775 sb->s_flags |= MS_RDONLY;
776 }
777
778
779
780
781
782
783
784
785
786
787 blocksize = sb_min_blocksize(sb, 1024);
788 if (!blocksize) {
789 if (!silent)
790 befs_error(sb, "unable to set blocksize");
791 goto unacquire_priv_sbp;
792 }
793
794 if (!(bh = sb_bread(sb, sb_block))) {
795 if (!silent)
796 befs_error(sb, "unable to read superblock");
797 goto unacquire_priv_sbp;
798 }
799
800
801 disk_sb = (befs_super_block *) bh->b_data;
802 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
803 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
804 befs_debug(sb, "Using PPC superblock location");
805 } else {
806 befs_debug(sb, "Using x86 superblock location");
807 disk_sb =
808 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
809 }
810
811 if ((befs_load_sb(sb, disk_sb) != BEFS_OK) ||
812 (befs_check_sb(sb) != BEFS_OK))
813 goto unacquire_bh;
814
815 befs_dump_super_block(sb, disk_sb);
816
817 brelse(bh);
818
819 if( befs_sb->num_blocks > ~((sector_t)0) ) {
820 if (!silent)
821 befs_error(sb, "blocks count: %llu is larger than the host can use",
822 befs_sb->num_blocks);
823 goto unacquire_priv_sbp;
824 }
825
826
827
828
829
830 sb->s_magic = BEFS_SUPER_MAGIC;
831
832 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
833 sb->s_op = &befs_sops;
834 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
835 if (IS_ERR(root)) {
836 ret = PTR_ERR(root);
837 goto unacquire_priv_sbp;
838 }
839 sb->s_root = d_make_root(root);
840 if (!sb->s_root) {
841 if (!silent)
842 befs_error(sb, "get root inode failed");
843 goto unacquire_priv_sbp;
844 }
845
846
847 if (befs_sb->mount_opts.iocharset) {
848 befs_debug(sb, "Loading nls: %s",
849 befs_sb->mount_opts.iocharset);
850 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
851 if (!befs_sb->nls) {
852 befs_warning(sb, "Cannot load nls %s"
853 " loading default nls",
854 befs_sb->mount_opts.iocharset);
855 befs_sb->nls = load_nls_default();
856 }
857
858 } else {
859 befs_debug(sb, "Loading default nls");
860 befs_sb->nls = load_nls_default();
861 }
862
863 return 0;
864
865 unacquire_bh:
866 brelse(bh);
867
868 unacquire_priv_sbp:
869 kfree(befs_sb->mount_opts.iocharset);
870 kfree(sb->s_fs_info);
871 sb->s_fs_info = NULL;
872
873 unacquire_none:
874 return ret;
875}
876
877static int
878befs_remount(struct super_block *sb, int *flags, char *data)
879{
880 sync_filesystem(sb);
881 if (!(*flags & MS_RDONLY))
882 return -EINVAL;
883 return 0;
884}
885
886static int
887befs_statfs(struct dentry *dentry, struct kstatfs *buf)
888{
889 struct super_block *sb = dentry->d_sb;
890 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
891
892 befs_debug(sb, "---> %s", __func__);
893
894 buf->f_type = BEFS_SUPER_MAGIC;
895 buf->f_bsize = sb->s_blocksize;
896 buf->f_blocks = BEFS_SB(sb)->num_blocks;
897 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
898 buf->f_bavail = buf->f_bfree;
899 buf->f_files = 0;
900 buf->f_ffree = 0;
901 buf->f_fsid.val[0] = (u32)id;
902 buf->f_fsid.val[1] = (u32)(id >> 32);
903 buf->f_namelen = BEFS_NAME_LEN;
904
905 befs_debug(sb, "<--- %s", __func__);
906
907 return 0;
908}
909
910static struct dentry *
911befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
912 void *data)
913{
914 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
915}
916
917static struct file_system_type befs_fs_type = {
918 .owner = THIS_MODULE,
919 .name = "befs",
920 .mount = befs_mount,
921 .kill_sb = kill_block_super,
922 .fs_flags = FS_REQUIRES_DEV,
923};
924MODULE_ALIAS_FS("befs");
925
926static int __init
927init_befs_fs(void)
928{
929 int err;
930
931 pr_info("version: %s\n", BEFS_VERSION);
932
933 err = befs_init_inodecache();
934 if (err)
935 goto unacquire_none;
936
937 err = register_filesystem(&befs_fs_type);
938 if (err)
939 goto unacquire_inodecache;
940
941 return 0;
942
943unacquire_inodecache:
944 befs_destroy_inodecache();
945
946unacquire_none:
947 return err;
948}
949
950static void __exit
951exit_befs_fs(void)
952{
953 befs_destroy_inodecache();
954
955 unregister_filesystem(&befs_fs_type);
956}
957
958
959
960
961
962
963module_init(init_befs_fs)
964module_exit(exit_befs_fs)
965