net: Fix issue with netdev_tx_reset_queue not resetting queue from XOFF state
[zen-stable.git] / fs / befs / linuxvfs.c
blob6e6d536767fe9c7f5964a2ce866e50db580ffebe
1 /*
2 * linux/fs/befs/linuxvfs.c
4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
6 */
8 #include <linux/module.h>
9 #include <linux/slab.h>
10 #include <linux/fs.h>
11 #include <linux/errno.h>
12 #include <linux/stat.h>
13 #include <linux/nls.h>
14 #include <linux/buffer_head.h>
15 #include <linux/vfs.h>
16 #include <linux/parser.h>
17 #include <linux/namei.h>
19 #include "befs.h"
20 #include "btree.h"
21 #include "inode.h"
22 #include "datastream.h"
23 #include "super.h"
24 #include "io.h"
26 MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
27 MODULE_AUTHOR("Will Dyson");
28 MODULE_LICENSE("GPL");
30 /* The units the vfs expects inode->i_blocks to be in */
31 #define VFS_BLOCK_SIZE 512
33 static int befs_readdir(struct file *, void *, filldir_t);
34 static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
35 static int befs_readpage(struct file *file, struct page *page);
36 static sector_t befs_bmap(struct address_space *mapping, sector_t block);
37 static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *);
38 static struct inode *befs_iget(struct super_block *, unsigned long);
39 static struct inode *befs_alloc_inode(struct super_block *sb);
40 static void befs_destroy_inode(struct inode *inode);
41 static int befs_init_inodecache(void);
42 static void befs_destroy_inodecache(void);
43 static void *befs_follow_link(struct dentry *, struct nameidata *);
44 static void befs_put_link(struct dentry *, struct nameidata *, void *);
45 static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
46 char **out, int *out_len);
47 static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
48 char **out, int *out_len);
49 static void befs_put_super(struct super_block *);
50 static int befs_remount(struct super_block *, int *, char *);
51 static int befs_statfs(struct dentry *, struct kstatfs *);
52 static int parse_options(char *, befs_mount_options *);
54 static const struct super_operations befs_sops = {
55 .alloc_inode = befs_alloc_inode, /* allocate a new inode */
56 .destroy_inode = befs_destroy_inode, /* deallocate an inode */
57 .put_super = befs_put_super, /* uninit super */
58 .statfs = befs_statfs, /* statfs */
59 .remount_fs = befs_remount,
60 .show_options = generic_show_options,
63 /* slab cache for befs_inode_info objects */
64 static struct kmem_cache *befs_inode_cachep;
66 static const struct file_operations befs_dir_operations = {
67 .read = generic_read_dir,
68 .readdir = befs_readdir,
69 .llseek = generic_file_llseek,
72 static const struct inode_operations befs_dir_inode_operations = {
73 .lookup = befs_lookup,
76 static const struct address_space_operations befs_aops = {
77 .readpage = befs_readpage,
78 .bmap = befs_bmap,
81 static const struct inode_operations befs_symlink_inode_operations = {
82 .readlink = generic_readlink,
83 .follow_link = befs_follow_link,
84 .put_link = befs_put_link,
87 /*
88 * Called by generic_file_read() to read a page of data
90 * In turn, simply calls a generic block read function and
91 * passes it the address of befs_get_block, for mapping file
92 * positions to disk blocks.
94 static int
95 befs_readpage(struct file *file, struct page *page)
97 return block_read_full_page(page, befs_get_block);
100 static sector_t
101 befs_bmap(struct address_space *mapping, sector_t block)
103 return generic_block_bmap(mapping, block, befs_get_block);
107 * Generic function to map a file position (block) to a
108 * disk offset (passed back in bh_result).
110 * Used by many higher level functions.
112 * Calls befs_fblock2brun() in datastream.c to do the real work.
114 * -WD 10-26-01
117 static int
118 befs_get_block(struct inode *inode, sector_t block,
119 struct buffer_head *bh_result, int create)
121 struct super_block *sb = inode->i_sb;
122 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
123 befs_block_run run = BAD_IADDR;
124 int res = 0;
125 ulong disk_off;
127 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
128 inode->i_ino, block);
130 if (block < 0) {
131 befs_error(sb, "befs_get_block() was asked for a block "
132 "number less than zero: block %ld in inode %lu",
133 block, inode->i_ino);
134 return -EIO;
137 if (create) {
138 befs_error(sb, "befs_get_block() was asked to write to "
139 "block %ld in inode %lu", block, inode->i_ino);
140 return -EPERM;
143 res = befs_fblock2brun(sb, ds, block, &run);
144 if (res != BEFS_OK) {
145 befs_error(sb,
146 "<--- befs_get_block() for inode %lu, block "
147 "%ld ERROR", inode->i_ino, block);
148 return -EFBIG;
151 disk_off = (ulong) iaddr2blockno(sb, &run);
153 map_bh(bh_result, inode->i_sb, disk_off);
155 befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, "
156 "disk address %lu", inode->i_ino, block, disk_off);
158 return 0;
161 static struct dentry *
162 befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
164 struct inode *inode = NULL;
165 struct super_block *sb = dir->i_sb;
166 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
167 befs_off_t offset;
168 int ret;
169 int utfnamelen;
170 char *utfname;
171 const char *name = dentry->d_name.name;
173 befs_debug(sb, "---> befs_lookup() "
174 "name %s inode %ld", dentry->d_name.name, dir->i_ino);
176 /* Convert to UTF-8 */
177 if (BEFS_SB(sb)->nls) {
178 ret =
179 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
180 if (ret < 0) {
181 befs_debug(sb, "<--- befs_lookup() ERROR");
182 return ERR_PTR(ret);
184 ret = befs_btree_find(sb, ds, utfname, &offset);
185 kfree(utfname);
187 } else {
188 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
191 if (ret == BEFS_BT_NOT_FOUND) {
192 befs_debug(sb, "<--- befs_lookup() %s not found",
193 dentry->d_name.name);
194 return ERR_PTR(-ENOENT);
196 } else if (ret != BEFS_OK || offset == 0) {
197 befs_warning(sb, "<--- befs_lookup() Error");
198 return ERR_PTR(-ENODATA);
201 inode = befs_iget(dir->i_sb, (ino_t) offset);
202 if (IS_ERR(inode))
203 return ERR_CAST(inode);
205 d_add(dentry, inode);
207 befs_debug(sb, "<--- befs_lookup()");
209 return NULL;
212 static int
213 befs_readdir(struct file *filp, void *dirent, filldir_t filldir)
215 struct inode *inode = filp->f_path.dentry->d_inode;
216 struct super_block *sb = inode->i_sb;
217 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
218 befs_off_t value;
219 int result;
220 size_t keysize;
221 unsigned char d_type;
222 char keybuf[BEFS_NAME_LEN + 1];
223 char *nlsname;
224 int nlsnamelen;
225 const char *dirname = filp->f_path.dentry->d_name.name;
227 befs_debug(sb, "---> befs_readdir() "
228 "name %s, inode %ld, filp->f_pos %Ld",
229 dirname, inode->i_ino, filp->f_pos);
231 result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1,
232 keybuf, &keysize, &value);
234 if (result == BEFS_ERR) {
235 befs_debug(sb, "<--- befs_readdir() ERROR");
236 befs_error(sb, "IO error reading %s (inode %lu)",
237 dirname, inode->i_ino);
238 return -EIO;
240 } else if (result == BEFS_BT_END) {
241 befs_debug(sb, "<--- befs_readdir() END");
242 return 0;
244 } else if (result == BEFS_BT_EMPTY) {
245 befs_debug(sb, "<--- befs_readdir() Empty directory");
246 return 0;
249 d_type = DT_UNKNOWN;
251 /* Convert to NLS */
252 if (BEFS_SB(sb)->nls) {
253 result =
254 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
255 if (result < 0) {
256 befs_debug(sb, "<--- befs_readdir() ERROR");
257 return result;
259 result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos,
260 (ino_t) value, d_type);
261 kfree(nlsname);
263 } else {
264 result = filldir(dirent, keybuf, keysize, filp->f_pos,
265 (ino_t) value, d_type);
268 filp->f_pos++;
270 befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos);
272 return 0;
275 static struct inode *
276 befs_alloc_inode(struct super_block *sb)
278 struct befs_inode_info *bi;
279 bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep,
280 GFP_KERNEL);
281 if (!bi)
282 return NULL;
283 return &bi->vfs_inode;
286 static void befs_i_callback(struct rcu_head *head)
288 struct inode *inode = container_of(head, struct inode, i_rcu);
289 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
292 static void befs_destroy_inode(struct inode *inode)
294 call_rcu(&inode->i_rcu, befs_i_callback);
297 static void init_once(void *foo)
299 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
301 inode_init_once(&bi->vfs_inode);
304 static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
306 struct buffer_head *bh = NULL;
307 befs_inode *raw_inode = NULL;
309 befs_sb_info *befs_sb = BEFS_SB(sb);
310 befs_inode_info *befs_ino = NULL;
311 struct inode *inode;
312 long ret = -EIO;
314 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino);
316 inode = iget_locked(sb, ino);
317 if (IS_ERR(inode))
318 return inode;
319 if (!(inode->i_state & I_NEW))
320 return inode;
322 befs_ino = BEFS_I(inode);
324 /* convert from vfs's inode number to befs's inode number */
325 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
327 befs_debug(sb, " real inode number [%u, %hu, %hu]",
328 befs_ino->i_inode_num.allocation_group,
329 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
331 bh = befs_bread(sb, inode->i_ino);
332 if (!bh) {
333 befs_error(sb, "unable to read inode block - "
334 "inode = %lu", inode->i_ino);
335 goto unacquire_none;
338 raw_inode = (befs_inode *) bh->b_data;
340 befs_dump_inode(sb, raw_inode);
342 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
343 befs_error(sb, "Bad inode: %lu", inode->i_ino);
344 goto unacquire_bh;
347 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
350 * set uid and gid. But since current BeOS is single user OS, so
351 * you can change by "uid" or "gid" options.
354 inode->i_uid = befs_sb->mount_opts.use_uid ?
355 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
356 inode->i_gid = befs_sb->mount_opts.use_gid ?
357 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
359 set_nlink(inode, 1);
362 * BEFS's time is 64 bits, but current VFS is 32 bits...
363 * BEFS don't have access time. Nor inode change time. VFS
364 * doesn't have creation time.
365 * Also, the lower 16 bits of the last_modified_time and
366 * create_time are just a counter to help ensure uniqueness
367 * for indexing purposes. (PFD, page 54)
370 inode->i_mtime.tv_sec =
371 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
372 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
373 inode->i_ctime = inode->i_mtime;
374 inode->i_atime = inode->i_mtime;
376 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
377 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
378 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
379 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
381 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
382 inode->i_size = 0;
383 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
384 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
385 BEFS_SYMLINK_LEN - 1);
386 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0';
387 } else {
388 int num_blks;
390 befs_ino->i_data.ds =
391 fsds_to_cpu(sb, &raw_inode->data.datastream);
393 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
394 inode->i_blocks =
395 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
396 inode->i_size = befs_ino->i_data.ds.size;
399 inode->i_mapping->a_ops = &befs_aops;
401 if (S_ISREG(inode->i_mode)) {
402 inode->i_fop = &generic_ro_fops;
403 } else if (S_ISDIR(inode->i_mode)) {
404 inode->i_op = &befs_dir_inode_operations;
405 inode->i_fop = &befs_dir_operations;
406 } else if (S_ISLNK(inode->i_mode)) {
407 inode->i_op = &befs_symlink_inode_operations;
408 } else {
409 befs_error(sb, "Inode %lu is not a regular file, "
410 "directory or symlink. THAT IS WRONG! BeFS has no "
411 "on disk special files", inode->i_ino);
412 goto unacquire_bh;
415 brelse(bh);
416 befs_debug(sb, "<--- befs_read_inode()");
417 unlock_new_inode(inode);
418 return inode;
420 unacquire_bh:
421 brelse(bh);
423 unacquire_none:
424 iget_failed(inode);
425 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
426 return ERR_PTR(ret);
429 /* Initialize the inode cache. Called at fs setup.
431 * Taken from NFS implementation by Al Viro.
433 static int
434 befs_init_inodecache(void)
436 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
437 sizeof (struct befs_inode_info),
438 0, (SLAB_RECLAIM_ACCOUNT|
439 SLAB_MEM_SPREAD),
440 init_once);
441 if (befs_inode_cachep == NULL) {
442 printk(KERN_ERR "befs_init_inodecache: "
443 "Couldn't initialize inode slabcache\n");
444 return -ENOMEM;
447 return 0;
450 /* Called at fs teardown.
452 * Taken from NFS implementation by Al Viro.
454 static void
455 befs_destroy_inodecache(void)
457 kmem_cache_destroy(befs_inode_cachep);
461 * The inode of symbolic link is different to data stream.
462 * The data stream become link name. Unless the LONG_SYMLINK
463 * flag is set.
465 static void *
466 befs_follow_link(struct dentry *dentry, struct nameidata *nd)
468 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
469 char *link;
471 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
472 struct super_block *sb = dentry->d_sb;
473 befs_data_stream *data = &befs_ino->i_data.ds;
474 befs_off_t len = data->size;
476 if (len == 0) {
477 befs_error(sb, "Long symlink with illegal length");
478 link = ERR_PTR(-EIO);
479 } else {
480 befs_debug(sb, "Follow long symlink");
482 link = kmalloc(len, GFP_NOFS);
483 if (!link) {
484 link = ERR_PTR(-ENOMEM);
485 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
486 kfree(link);
487 befs_error(sb, "Failed to read entire long symlink");
488 link = ERR_PTR(-EIO);
489 } else {
490 link[len - 1] = '\0';
493 } else {
494 link = befs_ino->i_data.symlink;
497 nd_set_link(nd, link);
498 return NULL;
501 static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
503 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
504 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
505 char *link = nd_get_link(nd);
506 if (!IS_ERR(link))
507 kfree(link);
512 * UTF-8 to NLS charset convert routine
515 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
516 * the nls tables directly
519 static int
520 befs_utf2nls(struct super_block *sb, const char *in,
521 int in_len, char **out, int *out_len)
523 struct nls_table *nls = BEFS_SB(sb)->nls;
524 int i, o;
525 unicode_t uni;
526 int unilen, utflen;
527 char *result;
528 /* The utf8->nls conversion won't make the final nls string bigger
529 * than the utf one, but if the string is pure ascii they'll have the
530 * same width and an extra char is needed to save the additional \0
532 int maxlen = in_len + 1;
534 befs_debug(sb, "---> utf2nls()");
536 if (!nls) {
537 befs_error(sb, "befs_utf2nls called with no NLS table loaded");
538 return -EINVAL;
541 *out = result = kmalloc(maxlen, GFP_NOFS);
542 if (!*out) {
543 befs_error(sb, "befs_utf2nls() cannot allocate memory");
544 *out_len = 0;
545 return -ENOMEM;
548 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
550 /* convert from UTF-8 to Unicode */
551 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
552 if (utflen < 0)
553 goto conv_err;
555 /* convert from Unicode to nls */
556 if (uni > MAX_WCHAR_T)
557 goto conv_err;
558 unilen = nls->uni2char(uni, &result[o], in_len - o);
559 if (unilen < 0)
560 goto conv_err;
562 result[o] = '\0';
563 *out_len = o;
565 befs_debug(sb, "<--- utf2nls()");
567 return o;
569 conv_err:
570 befs_error(sb, "Name using character set %s contains a character that "
571 "cannot be converted to unicode.", nls->charset);
572 befs_debug(sb, "<--- utf2nls()");
573 kfree(result);
574 return -EILSEQ;
578 * befs_nls2utf - Convert NLS string to utf8 encodeing
579 * @sb: Superblock
580 * @src: Input string buffer in NLS format
581 * @srclen: Length of input string in bytes
582 * @dest: The output string in UTF-8 format
583 * @destlen: Length of the output buffer
585 * Converts input string @src, which is in the format of the loaded NLS map,
586 * into a utf8 string.
588 * The destination string @dest is allocated by this function and the caller is
589 * responsible for freeing it with kfree()
591 * On return, *@destlen is the length of @dest in bytes.
593 * On success, the return value is the number of utf8 characters written to
594 * the output buffer @dest.
596 * On Failure, a negative number coresponding to the error code is returned.
599 static int
600 befs_nls2utf(struct super_block *sb, const char *in,
601 int in_len, char **out, int *out_len)
603 struct nls_table *nls = BEFS_SB(sb)->nls;
604 int i, o;
605 wchar_t uni;
606 int unilen, utflen;
607 char *result;
608 /* There're nls characters that will translate to 3-chars-wide UTF-8
609 * characters, a additional byte is needed to save the final \0
610 * in special cases */
611 int maxlen = (3 * in_len) + 1;
613 befs_debug(sb, "---> nls2utf()\n");
615 if (!nls) {
616 befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
617 return -EINVAL;
620 *out = result = kmalloc(maxlen, GFP_NOFS);
621 if (!*out) {
622 befs_error(sb, "befs_nls2utf() cannot allocate memory");
623 *out_len = 0;
624 return -ENOMEM;
627 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
629 /* convert from nls to unicode */
630 unilen = nls->char2uni(&in[i], in_len - i, &uni);
631 if (unilen < 0)
632 goto conv_err;
634 /* convert from unicode to UTF-8 */
635 utflen = utf32_to_utf8(uni, &result[o], 3);
636 if (utflen <= 0)
637 goto conv_err;
640 result[o] = '\0';
641 *out_len = o;
643 befs_debug(sb, "<--- nls2utf()");
645 return i;
647 conv_err:
648 befs_error(sb, "Name using charecter set %s contains a charecter that "
649 "cannot be converted to unicode.", nls->charset);
650 befs_debug(sb, "<--- nls2utf()");
651 kfree(result);
652 return -EILSEQ;
656 * Use the
659 enum {
660 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
663 static const match_table_t befs_tokens = {
664 {Opt_uid, "uid=%d"},
665 {Opt_gid, "gid=%d"},
666 {Opt_charset, "iocharset=%s"},
667 {Opt_debug, "debug"},
668 {Opt_err, NULL}
671 static int
672 parse_options(char *options, befs_mount_options * opts)
674 char *p;
675 substring_t args[MAX_OPT_ARGS];
676 int option;
678 /* Initialize options */
679 opts->uid = 0;
680 opts->gid = 0;
681 opts->use_uid = 0;
682 opts->use_gid = 0;
683 opts->iocharset = NULL;
684 opts->debug = 0;
686 if (!options)
687 return 1;
689 while ((p = strsep(&options, ",")) != NULL) {
690 int token;
691 if (!*p)
692 continue;
694 token = match_token(p, befs_tokens, args);
695 switch (token) {
696 case Opt_uid:
697 if (match_int(&args[0], &option))
698 return 0;
699 if (option < 0) {
700 printk(KERN_ERR "BeFS: Invalid uid %d, "
701 "using default\n", option);
702 break;
704 opts->uid = option;
705 opts->use_uid = 1;
706 break;
707 case Opt_gid:
708 if (match_int(&args[0], &option))
709 return 0;
710 if (option < 0) {
711 printk(KERN_ERR "BeFS: Invalid gid %d, "
712 "using default\n", option);
713 break;
715 opts->gid = option;
716 opts->use_gid = 1;
717 break;
718 case Opt_charset:
719 kfree(opts->iocharset);
720 opts->iocharset = match_strdup(&args[0]);
721 if (!opts->iocharset) {
722 printk(KERN_ERR "BeFS: allocation failure for "
723 "iocharset string\n");
724 return 0;
726 break;
727 case Opt_debug:
728 opts->debug = 1;
729 break;
730 default:
731 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
732 "or missing value\n", p);
733 return 0;
736 return 1;
739 /* This function has the responsibiltiy of getting the
740 * filesystem ready for unmounting.
741 * Basically, we free everything that we allocated in
742 * befs_read_inode
744 static void
745 befs_put_super(struct super_block *sb)
747 kfree(BEFS_SB(sb)->mount_opts.iocharset);
748 BEFS_SB(sb)->mount_opts.iocharset = NULL;
749 unload_nls(BEFS_SB(sb)->nls);
750 kfree(sb->s_fs_info);
751 sb->s_fs_info = NULL;
754 /* Allocate private field of the superblock, fill it.
756 * Finish filling the public superblock fields
757 * Make the root directory
758 * Load a set of NLS translations if needed.
760 static int
761 befs_fill_super(struct super_block *sb, void *data, int silent)
763 struct buffer_head *bh;
764 befs_sb_info *befs_sb;
765 befs_super_block *disk_sb;
766 struct inode *root;
767 long ret = -EINVAL;
768 const unsigned long sb_block = 0;
769 const off_t x86_sb_off = 512;
771 save_mount_options(sb, data);
773 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
774 if (sb->s_fs_info == NULL) {
775 printk(KERN_ERR
776 "BeFS(%s): Unable to allocate memory for private "
777 "portion of superblock. Bailing.\n", sb->s_id);
778 goto unacquire_none;
780 befs_sb = BEFS_SB(sb);
781 memset(befs_sb, 0, sizeof(befs_sb_info));
783 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
784 befs_error(sb, "cannot parse mount options");
785 goto unacquire_priv_sbp;
788 befs_debug(sb, "---> befs_fill_super()");
790 #ifndef CONFIG_BEFS_RW
791 if (!(sb->s_flags & MS_RDONLY)) {
792 befs_warning(sb,
793 "No write support. Marking filesystem read-only");
794 sb->s_flags |= MS_RDONLY;
796 #endif /* CONFIG_BEFS_RW */
799 * Set dummy blocksize to read super block.
800 * Will be set to real fs blocksize later.
802 * Linux 2.4.10 and later refuse to read blocks smaller than
803 * the hardsect size for the device. But we also need to read at
804 * least 1k to get the second 512 bytes of the volume.
805 * -WD 10-26-01
807 sb_min_blocksize(sb, 1024);
809 if (!(bh = sb_bread(sb, sb_block))) {
810 befs_error(sb, "unable to read superblock");
811 goto unacquire_priv_sbp;
814 /* account for offset of super block on x86 */
815 disk_sb = (befs_super_block *) bh->b_data;
816 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
817 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
818 befs_debug(sb, "Using PPC superblock location");
819 } else {
820 befs_debug(sb, "Using x86 superblock location");
821 disk_sb =
822 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
825 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
826 goto unacquire_bh;
828 befs_dump_super_block(sb, disk_sb);
830 brelse(bh);
832 if (befs_check_sb(sb) != BEFS_OK)
833 goto unacquire_priv_sbp;
835 if( befs_sb->num_blocks > ~((sector_t)0) ) {
836 befs_error(sb, "blocks count: %Lu "
837 "is larger than the host can use",
838 befs_sb->num_blocks);
839 goto unacquire_priv_sbp;
843 * set up enough so that it can read an inode
844 * Fill in kernel superblock fields from private sb
846 sb->s_magic = BEFS_SUPER_MAGIC;
847 /* Set real blocksize of fs */
848 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
849 sb->s_op = &befs_sops;
850 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
851 if (IS_ERR(root)) {
852 ret = PTR_ERR(root);
853 goto unacquire_priv_sbp;
855 sb->s_root = d_alloc_root(root);
856 if (!sb->s_root) {
857 iput(root);
858 befs_error(sb, "get root inode failed");
859 goto unacquire_priv_sbp;
862 /* load nls library */
863 if (befs_sb->mount_opts.iocharset) {
864 befs_debug(sb, "Loading nls: %s",
865 befs_sb->mount_opts.iocharset);
866 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
867 if (!befs_sb->nls) {
868 befs_warning(sb, "Cannot load nls %s"
869 " loading default nls",
870 befs_sb->mount_opts.iocharset);
871 befs_sb->nls = load_nls_default();
873 /* load default nls if none is specified in mount options */
874 } else {
875 befs_debug(sb, "Loading default nls");
876 befs_sb->nls = load_nls_default();
879 return 0;
880 /*****************/
881 unacquire_bh:
882 brelse(bh);
884 unacquire_priv_sbp:
885 kfree(befs_sb->mount_opts.iocharset);
886 kfree(sb->s_fs_info);
888 unacquire_none:
889 sb->s_fs_info = NULL;
890 return ret;
893 static int
894 befs_remount(struct super_block *sb, int *flags, char *data)
896 if (!(*flags & MS_RDONLY))
897 return -EINVAL;
898 return 0;
901 static int
902 befs_statfs(struct dentry *dentry, struct kstatfs *buf)
904 struct super_block *sb = dentry->d_sb;
905 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
907 befs_debug(sb, "---> befs_statfs()");
909 buf->f_type = BEFS_SUPER_MAGIC;
910 buf->f_bsize = sb->s_blocksize;
911 buf->f_blocks = BEFS_SB(sb)->num_blocks;
912 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
913 buf->f_bavail = buf->f_bfree;
914 buf->f_files = 0; /* UNKNOWN */
915 buf->f_ffree = 0; /* UNKNOWN */
916 buf->f_fsid.val[0] = (u32)id;
917 buf->f_fsid.val[1] = (u32)(id >> 32);
918 buf->f_namelen = BEFS_NAME_LEN;
920 befs_debug(sb, "<--- befs_statfs()");
922 return 0;
925 static struct dentry *
926 befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
927 void *data)
929 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
932 static struct file_system_type befs_fs_type = {
933 .owner = THIS_MODULE,
934 .name = "befs",
935 .mount = befs_mount,
936 .kill_sb = kill_block_super,
937 .fs_flags = FS_REQUIRES_DEV,
940 static int __init
941 init_befs_fs(void)
943 int err;
945 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
947 err = befs_init_inodecache();
948 if (err)
949 goto unacquire_none;
951 err = register_filesystem(&befs_fs_type);
952 if (err)
953 goto unacquire_inodecache;
955 return 0;
957 unacquire_inodecache:
958 befs_destroy_inodecache();
960 unacquire_none:
961 return err;
964 static void __exit
965 exit_befs_fs(void)
967 befs_destroy_inodecache();
969 unregister_filesystem(&befs_fs_type);
973 Macros that typecheck the init and exit functions,
974 ensures that they are called at init and cleanup,
975 and eliminates warnings about unused functions.
977 module_init(init_befs_fs)
978 module_exit(exit_befs_fs)