drm/log: select CONFIG_FONT_SUPPORT
[drm/drm-misc.git] / fs / befs / linuxvfs.c
blob8f430ff8e4458ffd37a634c5965c4c3e9dc0f1a8
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/befs/linuxvfs.c
5 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
7 */
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/fs.h>
14 #include <linux/fs_context.h>
15 #include <linux/fs_parser.h>
16 #include <linux/errno.h>
17 #include <linux/stat.h>
18 #include <linux/nls.h>
19 #include <linux/buffer_head.h>
20 #include <linux/vfs.h>
21 #include <linux/namei.h>
22 #include <linux/sched.h>
23 #include <linux/cred.h>
24 #include <linux/exportfs.h>
25 #include <linux/seq_file.h>
26 #include <linux/blkdev.h>
28 #include "befs.h"
29 #include "btree.h"
30 #include "inode.h"
31 #include "datastream.h"
32 #include "super.h"
33 #include "io.h"
35 MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
36 MODULE_AUTHOR("Will Dyson");
37 MODULE_LICENSE("GPL");
39 /* The units the vfs expects inode->i_blocks to be in */
40 #define VFS_BLOCK_SIZE 512
42 static int befs_readdir(struct file *, struct dir_context *);
43 static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
44 static int befs_read_folio(struct file *file, struct folio *folio);
45 static sector_t befs_bmap(struct address_space *mapping, sector_t block);
46 static struct dentry *befs_lookup(struct inode *, struct dentry *,
47 unsigned int);
48 static struct inode *befs_iget(struct super_block *, unsigned long);
49 static struct inode *befs_alloc_inode(struct super_block *sb);
50 static void befs_free_inode(struct inode *inode);
51 static void befs_destroy_inodecache(void);
52 static int befs_symlink_read_folio(struct file *, struct folio *);
53 static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
54 char **out, int *out_len);
55 static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
56 char **out, int *out_len);
57 static void befs_put_super(struct super_block *);
58 static int befs_statfs(struct dentry *, struct kstatfs *);
59 static int befs_show_options(struct seq_file *, struct dentry *);
60 static struct dentry *befs_fh_to_dentry(struct super_block *sb,
61 struct fid *fid, int fh_len, int fh_type);
62 static struct dentry *befs_fh_to_parent(struct super_block *sb,
63 struct fid *fid, int fh_len, int fh_type);
64 static struct dentry *befs_get_parent(struct dentry *child);
65 static void befs_free_fc(struct fs_context *fc);
67 static const struct super_operations befs_sops = {
68 .alloc_inode = befs_alloc_inode, /* allocate a new inode */
69 .free_inode = befs_free_inode, /* deallocate an inode */
70 .put_super = befs_put_super, /* uninit super */
71 .statfs = befs_statfs, /* statfs */
72 .show_options = befs_show_options,
75 /* slab cache for befs_inode_info objects */
76 static struct kmem_cache *befs_inode_cachep;
78 static const struct file_operations befs_dir_operations = {
79 .read = generic_read_dir,
80 .iterate_shared = befs_readdir,
81 .llseek = generic_file_llseek,
84 static const struct inode_operations befs_dir_inode_operations = {
85 .lookup = befs_lookup,
88 static const struct address_space_operations befs_aops = {
89 .read_folio = befs_read_folio,
90 .bmap = befs_bmap,
93 static const struct address_space_operations befs_symlink_aops = {
94 .read_folio = befs_symlink_read_folio,
97 static const struct export_operations befs_export_operations = {
98 .encode_fh = generic_encode_ino32_fh,
99 .fh_to_dentry = befs_fh_to_dentry,
100 .fh_to_parent = befs_fh_to_parent,
101 .get_parent = befs_get_parent,
105 * Called by generic_file_read() to read a folio of data
107 * In turn, simply calls a generic block read function and
108 * passes it the address of befs_get_block, for mapping file
109 * positions to disk blocks.
111 static int befs_read_folio(struct file *file, struct folio *folio)
113 return block_read_full_folio(folio, befs_get_block);
116 static sector_t
117 befs_bmap(struct address_space *mapping, sector_t block)
119 return generic_block_bmap(mapping, block, befs_get_block);
123 * Generic function to map a file position (block) to a
124 * disk offset (passed back in bh_result).
126 * Used by many higher level functions.
128 * Calls befs_fblock2brun() in datastream.c to do the real work.
131 static int
132 befs_get_block(struct inode *inode, sector_t block,
133 struct buffer_head *bh_result, int create)
135 struct super_block *sb = inode->i_sb;
136 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
137 befs_block_run run = BAD_IADDR;
138 int res;
139 ulong disk_off;
141 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
142 (unsigned long)inode->i_ino, (long)block);
143 if (create) {
144 befs_error(sb, "befs_get_block() was asked to write to "
145 "block %ld in inode %lu", (long)block,
146 (unsigned long)inode->i_ino);
147 return -EPERM;
150 res = befs_fblock2brun(sb, ds, block, &run);
151 if (res != BEFS_OK) {
152 befs_error(sb,
153 "<--- %s for inode %lu, block %ld ERROR",
154 __func__, (unsigned long)inode->i_ino,
155 (long)block);
156 return -EFBIG;
159 disk_off = (ulong) iaddr2blockno(sb, &run);
161 map_bh(bh_result, inode->i_sb, disk_off);
163 befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu",
164 __func__, (unsigned long)inode->i_ino, (long)block,
165 (unsigned long)disk_off);
167 return 0;
170 static struct dentry *
171 befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
173 struct inode *inode;
174 struct super_block *sb = dir->i_sb;
175 const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
176 befs_off_t offset;
177 int ret;
178 int utfnamelen;
179 char *utfname;
180 const char *name = dentry->d_name.name;
182 befs_debug(sb, "---> %s name %pd inode %ld", __func__,
183 dentry, dir->i_ino);
185 /* Convert to UTF-8 */
186 if (BEFS_SB(sb)->nls) {
187 ret =
188 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
189 if (ret < 0) {
190 befs_debug(sb, "<--- %s ERROR", __func__);
191 return ERR_PTR(ret);
193 ret = befs_btree_find(sb, ds, utfname, &offset);
194 kfree(utfname);
196 } else {
197 ret = befs_btree_find(sb, ds, name, &offset);
200 if (ret == BEFS_BT_NOT_FOUND) {
201 befs_debug(sb, "<--- %s %pd not found", __func__, dentry);
202 inode = NULL;
203 } else if (ret != BEFS_OK || offset == 0) {
204 befs_error(sb, "<--- %s Error", __func__);
205 inode = ERR_PTR(-ENODATA);
206 } else {
207 inode = befs_iget(dir->i_sb, (ino_t) offset);
209 befs_debug(sb, "<--- %s", __func__);
211 return d_splice_alias(inode, dentry);
214 static int
215 befs_readdir(struct file *file, struct dir_context *ctx)
217 struct inode *inode = file_inode(file);
218 struct super_block *sb = inode->i_sb;
219 const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
220 befs_off_t value;
221 int result;
222 size_t keysize;
223 char keybuf[BEFS_NAME_LEN + 1];
225 befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
226 __func__, file, inode->i_ino, ctx->pos);
228 while (1) {
229 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
230 keybuf, &keysize, &value);
232 if (result == BEFS_ERR) {
233 befs_debug(sb, "<--- %s ERROR", __func__);
234 befs_error(sb, "IO error reading %pD (inode %lu)",
235 file, inode->i_ino);
236 return -EIO;
238 } else if (result == BEFS_BT_END) {
239 befs_debug(sb, "<--- %s END", __func__);
240 return 0;
242 } else if (result == BEFS_BT_EMPTY) {
243 befs_debug(sb, "<--- %s Empty directory", __func__);
244 return 0;
247 /* Convert to NLS */
248 if (BEFS_SB(sb)->nls) {
249 char *nlsname;
250 int nlsnamelen;
252 result =
253 befs_utf2nls(sb, keybuf, keysize, &nlsname,
254 &nlsnamelen);
255 if (result < 0) {
256 befs_debug(sb, "<--- %s ERROR", __func__);
257 return result;
259 if (!dir_emit(ctx, nlsname, nlsnamelen,
260 (ino_t) value, DT_UNKNOWN)) {
261 kfree(nlsname);
262 return 0;
264 kfree(nlsname);
265 } else {
266 if (!dir_emit(ctx, keybuf, keysize,
267 (ino_t) value, DT_UNKNOWN))
268 return 0;
270 ctx->pos++;
274 static struct inode *
275 befs_alloc_inode(struct super_block *sb)
277 struct befs_inode_info *bi;
279 bi = alloc_inode_sb(sb, befs_inode_cachep, GFP_KERNEL);
280 if (!bi)
281 return NULL;
282 return &bi->vfs_inode;
285 static void befs_free_inode(struct inode *inode)
287 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
290 static void init_once(void *foo)
292 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
294 inode_init_once(&bi->vfs_inode);
297 static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
299 struct buffer_head *bh;
300 befs_inode *raw_inode;
301 struct befs_sb_info *befs_sb = BEFS_SB(sb);
302 struct befs_inode_info *befs_ino;
303 struct inode *inode;
305 befs_debug(sb, "---> %s inode = %lu", __func__, ino);
307 inode = iget_locked(sb, ino);
308 if (!inode)
309 return ERR_PTR(-ENOMEM);
310 if (!(inode->i_state & I_NEW))
311 return inode;
313 befs_ino = BEFS_I(inode);
315 /* convert from vfs's inode number to befs's inode number */
316 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
318 befs_debug(sb, " real inode number [%u, %hu, %hu]",
319 befs_ino->i_inode_num.allocation_group,
320 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
322 bh = sb_bread(sb, inode->i_ino);
323 if (!bh) {
324 befs_error(sb, "unable to read inode block - "
325 "inode = %lu", inode->i_ino);
326 goto unacquire_none;
329 raw_inode = (befs_inode *) bh->b_data;
331 befs_dump_inode(sb, raw_inode);
333 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
334 befs_error(sb, "Bad inode: %lu", inode->i_ino);
335 goto unacquire_bh;
338 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
341 * set uid and gid. But since current BeOS is single user OS, so
342 * you can change by "uid" or "gid" options.
345 inode->i_uid = befs_sb->mount_opts.use_uid ?
346 befs_sb->mount_opts.uid :
347 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
348 inode->i_gid = befs_sb->mount_opts.use_gid ?
349 befs_sb->mount_opts.gid :
350 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
352 set_nlink(inode, 1);
355 * BEFS's time is 64 bits, but current VFS is 32 bits...
356 * BEFS don't have access time. Nor inode change time. VFS
357 * doesn't have creation time.
358 * Also, the lower 16 bits of the last_modified_time and
359 * create_time are just a counter to help ensure uniqueness
360 * for indexing purposes. (PFD, page 54)
363 inode_set_mtime(inode,
364 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16,
365 0);/* lower 16 bits are not a time */
366 inode_set_ctime_to_ts(inode, inode_get_mtime(inode));
367 inode_set_atime_to_ts(inode, inode_get_mtime(inode));
369 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
370 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
371 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
372 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
374 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
375 inode->i_size = 0;
376 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
377 strscpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
378 BEFS_SYMLINK_LEN);
379 } else {
380 int num_blks;
382 befs_ino->i_data.ds =
383 fsds_to_cpu(sb, &raw_inode->data.datastream);
385 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
386 inode->i_blocks =
387 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
388 inode->i_size = befs_ino->i_data.ds.size;
391 inode->i_mapping->a_ops = &befs_aops;
393 if (S_ISREG(inode->i_mode)) {
394 inode->i_fop = &generic_ro_fops;
395 } else if (S_ISDIR(inode->i_mode)) {
396 inode->i_op = &befs_dir_inode_operations;
397 inode->i_fop = &befs_dir_operations;
398 } else if (S_ISLNK(inode->i_mode)) {
399 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
400 inode->i_op = &page_symlink_inode_operations;
401 inode_nohighmem(inode);
402 inode->i_mapping->a_ops = &befs_symlink_aops;
403 } else {
404 inode->i_link = befs_ino->i_data.symlink;
405 inode->i_op = &simple_symlink_inode_operations;
407 } else {
408 befs_error(sb, "Inode %lu is not a regular file, "
409 "directory or symlink. THAT IS WRONG! BeFS has no "
410 "on disk special files", inode->i_ino);
411 goto unacquire_bh;
414 brelse(bh);
415 befs_debug(sb, "<--- %s", __func__);
416 unlock_new_inode(inode);
417 return inode;
419 unacquire_bh:
420 brelse(bh);
422 unacquire_none:
423 iget_failed(inode);
424 befs_debug(sb, "<--- %s - Bad inode", __func__);
425 return ERR_PTR(-EIO);
428 /* Initialize the inode cache. Called at fs setup.
430 * Taken from NFS implementation by Al Viro.
432 static int __init
433 befs_init_inodecache(void)
435 befs_inode_cachep = kmem_cache_create_usercopy("befs_inode_cache",
436 sizeof(struct befs_inode_info), 0,
437 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
438 offsetof(struct befs_inode_info,
439 i_data.symlink),
440 sizeof_field(struct befs_inode_info,
441 i_data.symlink),
442 init_once);
443 if (befs_inode_cachep == NULL)
444 return -ENOMEM;
446 return 0;
449 /* Called at fs teardown.
451 * Taken from NFS implementation by Al Viro.
453 static void
454 befs_destroy_inodecache(void)
457 * Make sure all delayed rcu free inodes are flushed before we
458 * destroy cache.
460 rcu_barrier();
461 kmem_cache_destroy(befs_inode_cachep);
465 * The inode of symbolic link is different to data stream.
466 * The data stream become link name. Unless the LONG_SYMLINK
467 * flag is set.
469 static int befs_symlink_read_folio(struct file *unused, struct folio *folio)
471 struct inode *inode = folio->mapping->host;
472 struct super_block *sb = inode->i_sb;
473 struct befs_inode_info *befs_ino = BEFS_I(inode);
474 befs_data_stream *data = &befs_ino->i_data.ds;
475 befs_off_t len = data->size;
476 char *link = folio_address(folio);
477 int err = -EIO;
479 if (len == 0 || len > PAGE_SIZE) {
480 befs_error(sb, "Long symlink with illegal length");
481 goto fail;
483 befs_debug(sb, "Follow long symlink");
485 if (befs_read_lsymlink(sb, data, link, len) != len) {
486 befs_error(sb, "Failed to read entire long symlink");
487 goto fail;
489 link[len - 1] = '\0';
490 err = 0;
491 fail:
492 folio_end_read(folio, err == 0);
493 return err;
497 * UTF-8 to NLS charset convert routine
499 * Uses uni2char() / char2uni() rather than the nls tables directly
501 static int
502 befs_utf2nls(struct super_block *sb, const char *in,
503 int in_len, char **out, int *out_len)
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 /* The utf8->nls conversion won't make the final nls string bigger
511 * than the utf one, but if the string is pure ascii they'll have the
512 * same width and an extra char is needed to save the additional \0
514 int maxlen = in_len + 1;
516 befs_debug(sb, "---> %s", __func__);
518 if (!nls) {
519 befs_error(sb, "%s called with no NLS table loaded", __func__);
520 return -EINVAL;
523 *out = result = kmalloc(maxlen, GFP_NOFS);
524 if (!*out)
525 return -ENOMEM;
527 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
529 /* convert from UTF-8 to Unicode */
530 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
531 if (utflen < 0)
532 goto conv_err;
534 /* convert from Unicode to nls */
535 if (uni > MAX_WCHAR_T)
536 goto conv_err;
537 unilen = nls->uni2char(uni, &result[o], in_len - o);
538 if (unilen < 0)
539 goto conv_err;
541 result[o] = '\0';
542 *out_len = o;
544 befs_debug(sb, "<--- %s", __func__);
546 return o;
548 conv_err:
549 befs_error(sb, "Name using character set %s contains a character that "
550 "cannot be converted to unicode.", nls->charset);
551 befs_debug(sb, "<--- %s", __func__);
552 kfree(result);
553 return -EILSEQ;
557 * befs_nls2utf - Convert NLS string to utf8 encodeing
558 * @sb: Superblock
559 * @in: Input string buffer in NLS format
560 * @in_len: Length of input string in bytes
561 * @out: The output string in UTF-8 format
562 * @out_len: Length of the output buffer
564 * Converts input string @in, which is in the format of the loaded NLS map,
565 * into a utf8 string.
567 * The destination string @out is allocated by this function and the caller is
568 * responsible for freeing it with kfree()
570 * On return, *@out_len is the length of @out in bytes.
572 * On success, the return value is the number of utf8 characters written to
573 * the output buffer @out.
575 * On Failure, a negative number coresponding to the error code is returned.
578 static int
579 befs_nls2utf(struct super_block *sb, const char *in,
580 int in_len, char **out, int *out_len)
582 struct nls_table *nls = BEFS_SB(sb)->nls;
583 int i, o;
584 wchar_t uni;
585 int unilen, utflen;
586 char *result;
588 * There are nls characters that will translate to 3-chars-wide UTF-8
589 * characters, an additional byte is needed to save the final \0
590 * in special cases
592 int maxlen = (3 * in_len) + 1;
594 befs_debug(sb, "---> %s\n", __func__);
596 if (!nls) {
597 befs_error(sb, "%s called with no NLS table loaded.",
598 __func__);
599 return -EINVAL;
602 *out = result = kmalloc(maxlen, GFP_NOFS);
603 if (!*out) {
604 *out_len = 0;
605 return -ENOMEM;
608 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
610 /* convert from nls to unicode */
611 unilen = nls->char2uni(&in[i], in_len - i, &uni);
612 if (unilen < 0)
613 goto conv_err;
615 /* convert from unicode to UTF-8 */
616 utflen = utf32_to_utf8(uni, &result[o], 3);
617 if (utflen <= 0)
618 goto conv_err;
621 result[o] = '\0';
622 *out_len = o;
624 befs_debug(sb, "<--- %s", __func__);
626 return i;
628 conv_err:
629 befs_error(sb, "Name using character set %s contains a character that "
630 "cannot be converted to unicode.", nls->charset);
631 befs_debug(sb, "<--- %s", __func__);
632 kfree(result);
633 return -EILSEQ;
636 static struct inode *befs_nfs_get_inode(struct super_block *sb, uint64_t ino,
637 uint32_t generation)
639 /* No need to handle i_generation */
640 return befs_iget(sb, ino);
644 * Map a NFS file handle to a corresponding dentry
646 static struct dentry *befs_fh_to_dentry(struct super_block *sb,
647 struct fid *fid, int fh_len, int fh_type)
649 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
650 befs_nfs_get_inode);
654 * Find the parent for a file specified by NFS handle
656 static struct dentry *befs_fh_to_parent(struct super_block *sb,
657 struct fid *fid, int fh_len, int fh_type)
659 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
660 befs_nfs_get_inode);
663 static struct dentry *befs_get_parent(struct dentry *child)
665 struct inode *parent;
666 struct befs_inode_info *befs_ino = BEFS_I(d_inode(child));
668 parent = befs_iget(child->d_sb,
669 (unsigned long)befs_ino->i_parent.start);
670 return d_obtain_alias(parent);
673 enum {
674 Opt_uid, Opt_gid, Opt_charset, Opt_debug,
677 static const struct fs_parameter_spec befs_param_spec[] = {
678 fsparam_uid ("uid", Opt_uid),
679 fsparam_gid ("gid", Opt_gid),
680 fsparam_string ("iocharset", Opt_charset),
681 fsparam_flag ("debug", Opt_debug),
685 static int
686 befs_parse_param(struct fs_context *fc, struct fs_parameter *param)
688 struct befs_mount_options *opts = fc->fs_private;
689 int token;
690 struct fs_parse_result result;
692 /* befs ignores all options on remount */
693 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
694 return 0;
696 token = fs_parse(fc, befs_param_spec, param, &result);
697 if (token < 0)
698 return token;
700 switch (token) {
701 case Opt_uid:
702 opts->uid = result.uid;
703 opts->use_uid = 1;
704 break;
705 case Opt_gid:
706 opts->gid = result.gid;
707 opts->use_gid = 1;
708 break;
709 case Opt_charset:
710 kfree(opts->iocharset);
711 opts->iocharset = param->string;
712 param->string = NULL;
713 break;
714 case Opt_debug:
715 opts->debug = 1;
716 break;
717 default:
718 return -EINVAL;
720 return 0;
723 static int befs_show_options(struct seq_file *m, struct dentry *root)
725 struct befs_sb_info *befs_sb = BEFS_SB(root->d_sb);
726 struct befs_mount_options *opts = &befs_sb->mount_opts;
728 if (!uid_eq(opts->uid, GLOBAL_ROOT_UID))
729 seq_printf(m, ",uid=%u",
730 from_kuid_munged(&init_user_ns, opts->uid));
731 if (!gid_eq(opts->gid, GLOBAL_ROOT_GID))
732 seq_printf(m, ",gid=%u",
733 from_kgid_munged(&init_user_ns, opts->gid));
734 if (opts->iocharset)
735 seq_printf(m, ",charset=%s", opts->iocharset);
736 if (opts->debug)
737 seq_puts(m, ",debug");
738 return 0;
741 /* This function has the responsibiltiy of getting the
742 * filesystem ready for unmounting.
743 * Basically, we free everything that we allocated in
744 * befs_read_inode
746 static void
747 befs_put_super(struct super_block *sb)
749 kfree(BEFS_SB(sb)->mount_opts.iocharset);
750 BEFS_SB(sb)->mount_opts.iocharset = NULL;
751 unload_nls(BEFS_SB(sb)->nls);
752 kfree(sb->s_fs_info);
753 sb->s_fs_info = NULL;
757 * Copy the parsed options into the sbi mount_options member
759 static void
760 befs_set_options(struct befs_sb_info *sbi, struct befs_mount_options *opts)
762 sbi->mount_opts.uid = opts->uid;
763 sbi->mount_opts.gid = opts->gid;
764 sbi->mount_opts.use_uid = opts->use_uid;
765 sbi->mount_opts.use_gid = opts->use_gid;
766 sbi->mount_opts.debug = opts->debug;
767 sbi->mount_opts.iocharset = opts->iocharset;
768 opts->iocharset = NULL;
771 /* Allocate private field of the superblock, fill it.
773 * Finish filling the public superblock fields
774 * Make the root directory
775 * Load a set of NLS translations if needed.
777 static int
778 befs_fill_super(struct super_block *sb, struct fs_context *fc)
780 struct buffer_head *bh;
781 struct befs_sb_info *befs_sb;
782 befs_super_block *disk_sb;
783 struct inode *root;
784 long ret = -EINVAL;
785 const unsigned long sb_block = 0;
786 const off_t x86_sb_off = 512;
787 int blocksize;
788 struct befs_mount_options *parsed_opts = fc->fs_private;
789 int silent = fc->sb_flags & SB_SILENT;
791 sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
792 if (sb->s_fs_info == NULL)
793 goto unacquire_none;
795 befs_sb = BEFS_SB(sb);
797 befs_set_options(befs_sb, parsed_opts);
799 befs_debug(sb, "---> %s", __func__);
801 if (!sb_rdonly(sb)) {
802 befs_warning(sb,
803 "No write support. Marking filesystem read-only");
804 sb->s_flags |= SB_RDONLY;
808 * Set dummy blocksize to read super block.
809 * Will be set to real fs blocksize later.
811 * Linux 2.4.10 and later refuse to read blocks smaller than
812 * the logical block size for the device. But we also need to read at
813 * least 1k to get the second 512 bytes of the volume.
815 blocksize = sb_min_blocksize(sb, 1024);
816 if (!blocksize) {
817 if (!silent)
818 befs_error(sb, "unable to set blocksize");
819 goto unacquire_priv_sbp;
822 bh = sb_bread(sb, sb_block);
823 if (!bh) {
824 if (!silent)
825 befs_error(sb, "unable to read superblock");
826 goto unacquire_priv_sbp;
829 /* account for offset of super block on x86 */
830 disk_sb = (befs_super_block *) bh->b_data;
831 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
832 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
833 befs_debug(sb, "Using PPC superblock location");
834 } else {
835 befs_debug(sb, "Using x86 superblock location");
836 disk_sb =
837 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
840 if ((befs_load_sb(sb, disk_sb) != BEFS_OK) ||
841 (befs_check_sb(sb) != BEFS_OK))
842 goto unacquire_bh;
844 befs_dump_super_block(sb, disk_sb);
846 brelse(bh);
848 if (befs_sb->num_blocks > ~((sector_t)0)) {
849 if (!silent)
850 befs_error(sb, "blocks count: %llu is larger than the host can use",
851 befs_sb->num_blocks);
852 goto unacquire_priv_sbp;
856 * set up enough so that it can read an inode
857 * Fill in kernel superblock fields from private sb
859 sb->s_magic = BEFS_SUPER_MAGIC;
860 /* Set real blocksize of fs */
861 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
862 sb->s_op = &befs_sops;
863 sb->s_export_op = &befs_export_operations;
864 sb->s_time_min = 0;
865 sb->s_time_max = 0xffffffffffffll;
866 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
867 if (IS_ERR(root)) {
868 ret = PTR_ERR(root);
869 goto unacquire_priv_sbp;
871 sb->s_root = d_make_root(root);
872 if (!sb->s_root) {
873 if (!silent)
874 befs_error(sb, "get root inode failed");
875 goto unacquire_priv_sbp;
878 /* load nls library */
879 if (befs_sb->mount_opts.iocharset) {
880 befs_debug(sb, "Loading nls: %s",
881 befs_sb->mount_opts.iocharset);
882 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
883 if (!befs_sb->nls) {
884 befs_warning(sb, "Cannot load nls %s"
885 " loading default nls",
886 befs_sb->mount_opts.iocharset);
887 befs_sb->nls = load_nls_default();
889 /* load default nls if none is specified in mount options */
890 } else {
891 befs_debug(sb, "Loading default nls");
892 befs_sb->nls = load_nls_default();
895 return 0;
897 unacquire_bh:
898 brelse(bh);
900 unacquire_priv_sbp:
901 kfree(befs_sb->mount_opts.iocharset);
902 kfree(sb->s_fs_info);
903 sb->s_fs_info = NULL;
905 unacquire_none:
906 return ret;
909 static int
910 befs_reconfigure(struct fs_context *fc)
912 sync_filesystem(fc->root->d_sb);
913 if (!(fc->sb_flags & SB_RDONLY))
914 return -EINVAL;
915 return 0;
918 static int
919 befs_statfs(struct dentry *dentry, struct kstatfs *buf)
921 struct super_block *sb = dentry->d_sb;
922 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
924 befs_debug(sb, "---> %s", __func__);
926 buf->f_type = BEFS_SUPER_MAGIC;
927 buf->f_bsize = sb->s_blocksize;
928 buf->f_blocks = BEFS_SB(sb)->num_blocks;
929 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
930 buf->f_bavail = buf->f_bfree;
931 buf->f_files = 0; /* UNKNOWN */
932 buf->f_ffree = 0; /* UNKNOWN */
933 buf->f_fsid = u64_to_fsid(id);
934 buf->f_namelen = BEFS_NAME_LEN;
936 befs_debug(sb, "<--- %s", __func__);
938 return 0;
941 static int befs_get_tree(struct fs_context *fc)
943 return get_tree_bdev(fc, befs_fill_super);
946 static const struct fs_context_operations befs_context_ops = {
947 .parse_param = befs_parse_param,
948 .get_tree = befs_get_tree,
949 .reconfigure = befs_reconfigure,
950 .free = befs_free_fc,
953 static int befs_init_fs_context(struct fs_context *fc)
955 struct befs_mount_options *opts;
957 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
958 if (!opts)
959 return -ENOMEM;
961 /* Initialize options */
962 opts->uid = GLOBAL_ROOT_UID;
963 opts->gid = GLOBAL_ROOT_GID;
965 fc->fs_private = opts;
966 fc->ops = &befs_context_ops;
968 return 0;
971 static void befs_free_fc(struct fs_context *fc)
973 struct befs_mount_options *opts = fc->fs_private;
975 kfree(opts->iocharset);
976 kfree(fc->fs_private);
979 static struct file_system_type befs_fs_type = {
980 .owner = THIS_MODULE,
981 .name = "befs",
982 .kill_sb = kill_block_super,
983 .fs_flags = FS_REQUIRES_DEV,
984 .init_fs_context = befs_init_fs_context,
985 .parameters = befs_param_spec,
987 MODULE_ALIAS_FS("befs");
989 static int __init
990 init_befs_fs(void)
992 int err;
994 pr_info("version: %s\n", BEFS_VERSION);
996 err = befs_init_inodecache();
997 if (err)
998 goto unacquire_none;
1000 err = register_filesystem(&befs_fs_type);
1001 if (err)
1002 goto unacquire_inodecache;
1004 return 0;
1006 unacquire_inodecache:
1007 befs_destroy_inodecache();
1009 unacquire_none:
1010 return err;
1013 static void __exit
1014 exit_befs_fs(void)
1016 befs_destroy_inodecache();
1018 unregister_filesystem(&befs_fs_type);
1022 * Macros that typecheck the init and exit functions,
1023 * ensures that they are called at init and cleanup,
1024 * and eliminates warnings about unused functions.
1026 module_init(init_befs_fs)
1027 module_exit(exit_befs_fs)