blob: cc0e08252913a46141c939d323485a55eb74760f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/befs/linuxvfs.c
3 *
4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
5 *
6 */
7
Fabian Frederickdac52fc2014-04-03 14:50:23 -07008#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#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>
Eric W. Biederman31aba052012-02-10 10:51:24 -080020#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22#include "befs.h"
23#include "btree.h"
24#include "inode.h"
25#include "datastream.h"
26#include "super.h"
27#include "io.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
30MODULE_AUTHOR("Will Dyson");
31MODULE_LICENSE("GPL");
32
33/* The units the vfs expects inode->i_blocks to be in */
34#define VFS_BLOCK_SIZE 512
35
Al Virof0f49ef2013-05-22 13:44:05 -040036static int befs_readdir(struct file *, struct dir_context *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static 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);
Al Viro00cd8dd2012-06-10 17:13:09 -040040static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int);
David Howells96eb5412008-02-07 00:15:31 -080041static struct inode *befs_iget(struct super_block *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042static struct inode *befs_alloc_inode(struct super_block *sb);
43static void befs_destroy_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044static void befs_destroy_inodecache(void);
Al Viro11803f92015-11-13 06:57:13 -050045static int befs_symlink_readpage(struct file *, struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static 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 *);
David Howells726c3342006-06-23 02:02:58 -070052static int befs_statfs(struct dentry *, struct kstatfs *);
Fabian Frederick09ad0ea2015-04-16 12:46:17 -070053static int parse_options(char *, struct befs_mount_options *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55static const struct super_operations befs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 .alloc_inode = befs_alloc_inode, /* allocate a new inode */
57 .destroy_inode = befs_destroy_inode, /* deallocate an inode */
58 .put_super = befs_put_super, /* uninit super */
59 .statfs = befs_statfs, /* statfs */
60 .remount_fs = befs_remount,
Miklos Szeredi552c3c62008-02-08 04:21:38 -080061 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -070062};
63
64/* slab cache for befs_inode_info objects */
Christoph Lametere18b8902006-12-06 20:33:20 -080065static struct kmem_cache *befs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080067static const struct file_operations befs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 .read = generic_read_dir,
Al Virof0f49ef2013-05-22 13:44:05 -040069 .iterate = befs_readdir,
Al Viro59af1582008-08-24 07:24:41 -040070 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
Arjan van de Ven754661f2007-02-12 00:55:38 -080073static const struct inode_operations befs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 .lookup = befs_lookup,
75};
76
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070077static const struct address_space_operations befs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 .readpage = befs_readpage,
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 .bmap = befs_bmap,
80};
81
Al Viro11803f92015-11-13 06:57:13 -050082static const struct address_space_operations befs_symlink_aops = {
83 .readpage = befs_symlink_readpage,
Linus Torvalds1da177e2005-04-16 15:20:36 -070084};
85
86/*
87 * Called by generic_file_read() to read a page of data
88 *
89 * In turn, simply calls a generic block read function and
90 * passes it the address of befs_get_block, for mapping file
91 * positions to disk blocks.
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 * Generic function to map a file position (block) to a
107 * disk offset (passed back in bh_result).
108 *
109 * Used by many higher level functions.
110 *
111 * Calls befs_fblock2brun() in datastream.c to do the real work.
112 *
113 * -WD 10-26-01
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 = 0;
124 ulong disk_off;
125
126 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700127 (unsigned long)inode->i_ino, (long)block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (create) {
129 befs_error(sb, "befs_get_block() was asked to write to "
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700130 "block %ld in inode %lu", (long)block,
131 (unsigned long)inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 return -EPERM;
133 }
134
135 res = befs_fblock2brun(sb, ds, block, &run);
136 if (res != BEFS_OK) {
137 befs_error(sb,
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700138 "<--- %s for inode %lu, block %ld ERROR",
139 __func__, (unsigned long)inode->i_ino,
140 (long)block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 return -EFBIG;
142 }
143
144 disk_off = (ulong) iaddr2blockno(sb, &run);
145
146 map_bh(bh_result, inode->i_sb, disk_off);
147
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700148 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 return 0;
153}
154
155static struct dentry *
Al Viro00cd8dd2012-06-10 17:13:09 -0400156befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
158 struct inode *inode = NULL;
159 struct super_block *sb = dir->i_sb;
160 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
Al Viroa4555892014-10-21 20:11:25 -0400167 befs_debug(sb, "---> %s name %pd inode %ld", __func__,
168 dentry, dir->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 /* Convert to UTF-8 */
171 if (BEFS_SB(sb)->nls) {
172 ret =
173 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
174 if (ret < 0) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700175 befs_debug(sb, "<--- %s ERROR", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 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, dentry->d_name.name, &offset);
183 }
184
185 if (ret == BEFS_BT_NOT_FOUND) {
Al Viroa4555892014-10-21 20:11:25 -0400186 befs_debug(sb, "<--- %s %pd not found", __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return ERR_PTR(-ENOENT);
188
189 } else if (ret != BEFS_OK || offset == 0) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700190 befs_warning(sb, "<--- %s Error", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 return ERR_PTR(-ENODATA);
192 }
193
David Howells96eb5412008-02-07 00:15:31 -0800194 inode = befs_iget(dir->i_sb, (ino_t) offset);
195 if (IS_ERR(inode))
196 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 d_add(dentry, inode);
199
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700200 befs_debug(sb, "<--- %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 return NULL;
203}
204
205static int
Al Virof0f49ef2013-05-22 13:44:05 -0400206befs_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
Al Virof0f49ef2013-05-22 13:44:05 -0400208 struct inode *inode = file_inode(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 struct super_block *sb = inode->i_sb;
210 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
211 befs_off_t value;
212 int result;
213 size_t keysize;
214 unsigned char d_type;
215 char keybuf[BEFS_NAME_LEN + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Al Viroa4555892014-10-21 20:11:25 -0400217 befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
218 __func__, file, inode->i_ino, ctx->pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Al Virof0f49ef2013-05-22 13:44:05 -0400220more:
221 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 keybuf, &keysize, &value);
223
224 if (result == BEFS_ERR) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700225 befs_debug(sb, "<--- %s ERROR", __func__);
Al Viroa4555892014-10-21 20:11:25 -0400226 befs_error(sb, "IO error reading %pD (inode %lu)",
227 file, inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return -EIO;
229
230 } else if (result == BEFS_BT_END) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700231 befs_debug(sb, "<--- %s END", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return 0;
233
234 } else if (result == BEFS_BT_EMPTY) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700235 befs_debug(sb, "<--- %s Empty directory", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 return 0;
237 }
238
239 d_type = DT_UNKNOWN;
240
241 /* Convert to NLS */
242 if (BEFS_SB(sb)->nls) {
Al Virof0f49ef2013-05-22 13:44:05 -0400243 char *nlsname;
244 int nlsnamelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 result =
246 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
247 if (result < 0) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700248 befs_debug(sb, "<--- %s ERROR", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 return result;
250 }
Al Virof0f49ef2013-05-22 13:44:05 -0400251 if (!dir_emit(ctx, nlsname, nlsnamelen,
252 (ino_t) value, d_type)) {
253 kfree(nlsname);
254 return 0;
255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 kfree(nlsname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 } else {
Al Virof0f49ef2013-05-22 13:44:05 -0400258 if (!dir_emit(ctx, keybuf, keysize,
259 (ino_t) value, d_type))
260 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 }
Al Virof0f49ef2013-05-22 13:44:05 -0400262 ctx->pos++;
263 goto more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
266static struct inode *
267befs_alloc_inode(struct super_block *sb)
268{
Fabian Frederick111d6392015-02-17 13:45:23 -0800269 struct befs_inode_info *bi;
270
271 bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 if (!bi)
273 return NULL;
274 return &bi->vfs_inode;
275}
276
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100277static void befs_i_callback(struct rcu_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100279 struct inode *inode = container_of(head, struct inode, i_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
281}
282
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100283static void befs_destroy_inode(struct inode *inode)
284{
285 call_rcu(&inode->i_rcu, befs_i_callback);
286}
287
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700288static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289{
290 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
Christoph Lametera35afb82007-05-16 22:10:57 -0700291
292 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
David Howells96eb5412008-02-07 00:15:31 -0800295static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
297 struct buffer_head *bh = NULL;
298 befs_inode *raw_inode = NULL;
Fabian Frederick038428f2015-04-16 12:46:20 -0700299 struct befs_sb_info *befs_sb = BEFS_SB(sb);
Fabian Frederickf8ccad22015-04-16 12:46:23 -0700300 struct befs_inode_info *befs_ino = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800301 struct inode *inode;
302 long ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700304 befs_debug(sb, "---> %s inode = %lu", __func__, ino);
David Howells96eb5412008-02-07 00:15:31 -0800305
306 inode = iget_locked(sb, ino);
Rakesh Panditac34a1b2014-01-15 19:58:28 +0200307 if (!inode)
308 return ERR_PTR(-ENOMEM);
David Howells96eb5412008-02-07 00:15:31 -0800309 if (!(inode->i_state & I_NEW))
310 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312 befs_ino = BEFS_I(inode);
313
314 /* convert from vfs's inode number to befs's inode number */
315 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
316
317 befs_debug(sb, " real inode number [%u, %hu, %hu]",
318 befs_ino->i_inode_num.allocation_group,
319 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
320
321 bh = befs_bread(sb, inode->i_ino);
322 if (!bh) {
323 befs_error(sb, "unable to read inode block - "
324 "inode = %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200325 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327
328 raw_inode = (befs_inode *) bh->b_data;
329
330 befs_dump_inode(sb, raw_inode);
331
332 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
333 befs_error(sb, "Bad inode: %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200334 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 }
336
337 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
338
339 /*
340 * set uid and gid. But since current BeOS is single user OS, so
341 * you can change by "uid" or "gid" options.
342 */
343
344 inode->i_uid = befs_sb->mount_opts.use_uid ?
Eric W. Biederman31aba052012-02-10 10:51:24 -0800345 befs_sb->mount_opts.uid :
346 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 inode->i_gid = befs_sb->mount_opts.use_gid ?
Eric W. Biederman31aba052012-02-10 10:51:24 -0800348 befs_sb->mount_opts.gid :
349 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Miklos Szeredibfe86842011-10-28 14:13:29 +0200351 set_nlink(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
353 /*
354 * BEFS's time is 64 bits, but current VFS is 32 bits...
355 * BEFS don't have access time. Nor inode change time. VFS
356 * doesn't have creation time.
357 * Also, the lower 16 bits of the last_modified_time and
358 * create_time are just a counter to help ensure uniqueness
359 * for indexing purposes. (PFD, page 54)
360 */
361
362 inode->i_mtime.tv_sec =
363 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
364 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
365 inode->i_ctime = inode->i_mtime;
366 inode->i_atime = inode->i_mtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
368 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
369 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
370 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
371 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
372
373 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
374 inode->i_size = 0;
375 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
Fabian Frederick39d7a292014-06-06 14:36:15 -0700376 strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
377 BEFS_SYMLINK_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 } else {
379 int num_blks;
380
381 befs_ino->i_data.ds =
Jesper Juhle0e3d322011-01-12 17:00:26 -0800382 fsds_to_cpu(sb, &raw_inode->data.datastream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
385 inode->i_blocks =
386 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
387 inode->i_size = befs_ino->i_data.ds.size;
388 }
389
390 inode->i_mapping->a_ops = &befs_aops;
391
392 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig2cf06912005-11-07 00:59:44 -0800393 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 } else if (S_ISDIR(inode->i_mode)) {
395 inode->i_op = &befs_dir_inode_operations;
396 inode->i_fop = &befs_dir_operations;
397 } else if (S_ISLNK(inode->i_mode)) {
Al Virod0deec12015-05-02 10:06:54 -0400398 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
Al Viro11803f92015-11-13 06:57:13 -0500399 inode->i_op = &page_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -0500400 inode_nohighmem(inode);
Al Viro11803f92015-11-13 06:57:13 -0500401 inode->i_mapping->a_ops = &befs_symlink_aops;
Al Virod0deec12015-05-02 10:06:54 -0400402 } else {
403 inode->i_link = befs_ino->i_data.symlink;
404 inode->i_op = &simple_symlink_inode_operations;
405 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 } else {
407 befs_error(sb, "Inode %lu is not a regular file, "
408 "directory or symlink. THAT IS WRONG! BeFS has no "
409 "on disk special files", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200410 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 }
412
413 brelse(bh);
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700414 befs_debug(sb, "<--- %s", __func__);
David Howells96eb5412008-02-07 00:15:31 -0800415 unlock_new_inode(inode);
416 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Adrian Bunk04187262006-06-30 18:23:04 +0200418 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 brelse(bh);
420
Adrian Bunk04187262006-06-30 18:23:04 +0200421 unacquire_none:
David Howells96eb5412008-02-07 00:15:31 -0800422 iget_failed(inode);
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700423 befs_debug(sb, "<--- %s - Bad inode", __func__);
David Howells96eb5412008-02-07 00:15:31 -0800424 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425}
426
427/* Initialize the inode cache. Called at fs setup.
Paul Mundt20c2df82007-07-20 10:11:58 +0900428 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 * Taken from NFS implementation by Al Viro.
430 */
Fabian Frederick91a52ab2014-04-03 14:50:22 -0700431static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432befs_init_inodecache(void)
433{
434 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
435 sizeof (struct befs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800436 0, (SLAB_RECLAIM_ACCOUNT|
Vladimir Davydov5d097052016-01-14 15:18:21 -0800437 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900438 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 if (befs_inode_cachep == NULL) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700440 pr_err("%s: Couldn't initialize inode slabcache\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return -ENOMEM;
442 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 return 0;
444}
445
446/* Called at fs teardown.
447 *
448 * Taken from NFS implementation by Al Viro.
449 */
450static void
451befs_destroy_inodecache(void)
452{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000453 /*
454 * Make sure all delayed rcu free inodes are flushed before we
455 * destroy cache.
456 */
457 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700458 kmem_cache_destroy(befs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
460
461/*
462 * The inode of symbolic link is different to data stream.
463 * The data stream become link name. Unless the LONG_SYMLINK
464 * flag is set.
465 */
Al Viro11803f92015-11-13 06:57:13 -0500466static int befs_symlink_readpage(struct file *unused, struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
Al Viro11803f92015-11-13 06:57:13 -0500468 struct inode *inode = page->mapping->host;
469 struct super_block *sb = inode->i_sb;
470 struct befs_inode_info *befs_ino = BEFS_I(inode);
Al Viro48bc06e2013-09-16 10:35:31 -0400471 befs_data_stream *data = &befs_ino->i_data.ds;
472 befs_off_t len = data->size;
Al Viro21fc61c2015-11-17 01:07:57 -0500473 char *link = page_address(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Al Viro11803f92015-11-13 06:57:13 -0500475 if (len == 0 || len > PAGE_SIZE) {
Al Viro48bc06e2013-09-16 10:35:31 -0400476 befs_error(sb, "Long symlink with illegal length");
Al Viro11803f92015-11-13 06:57:13 -0500477 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 }
Al Viro680baac2015-05-02 13:32:22 -0400479 befs_debug(sb, "Follow long symlink");
480
Al Viro680baac2015-05-02 13:32:22 -0400481 if (befs_read_lsymlink(sb, data, link, len) != len) {
Al Viro680baac2015-05-02 13:32:22 -0400482 befs_error(sb, "Failed to read entire long symlink");
Al Viro11803f92015-11-13 06:57:13 -0500483 goto fail;
Al Viro680baac2015-05-02 13:32:22 -0400484 }
485 link[len - 1] = '\0';
Al Viro11803f92015-11-13 06:57:13 -0500486 SetPageUptodate(page);
Al Viro11803f92015-11-13 06:57:13 -0500487 unlock_page(page);
488 return 0;
489fail:
490 SetPageError(page);
Al Viro11803f92015-11-13 06:57:13 -0500491 unlock_page(page);
492 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493}
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495/*
496 * UTF-8 to NLS charset convert routine
497 *
498 *
499 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
500 * the nls tables directly
501 */
502
503static int
504befs_utf2nls(struct super_block *sb, const char *in,
505 int in_len, char **out, int *out_len)
506{
507 struct nls_table *nls = BEFS_SB(sb)->nls;
508 int i, o;
Alan Stern74675a52009-04-30 10:08:18 -0400509 unicode_t uni;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 int unilen, utflen;
511 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700512 /* The utf8->nls conversion won't make the final nls string bigger
513 * than the utf one, but if the string is pure ascii they'll have the
514 * same width and an extra char is needed to save the additional \0
515 */
516 int maxlen = in_len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700518 befs_debug(sb, "---> %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 if (!nls) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700521 befs_error(sb, "%s called with no NLS table loaded", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 return -EINVAL;
523 }
524
525 *out = result = kmalloc(maxlen, GFP_NOFS);
526 if (!*out) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700527 befs_error(sb, "%s cannot allocate memory", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 *out_len = 0;
529 return -ENOMEM;
530 }
531
532 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
533
534 /* convert from UTF-8 to Unicode */
Alan Stern74675a52009-04-30 10:08:18 -0400535 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
536 if (utflen < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 /* convert from Unicode to nls */
Alan Stern74675a52009-04-30 10:08:18 -0400540 if (uni > MAX_WCHAR_T)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 goto conv_err;
Alan Stern74675a52009-04-30 10:08:18 -0400542 unilen = nls->uni2char(uni, &result[o], in_len - o);
543 if (unilen < 0)
544 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 }
546 result[o] = '\0';
547 *out_len = o;
548
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700549 befs_debug(sb, "<--- %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 return o;
552
553 conv_err:
554 befs_error(sb, "Name using character set %s contains a character that "
555 "cannot be converted to unicode.", nls->charset);
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700556 befs_debug(sb, "<--- %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 kfree(result);
558 return -EILSEQ;
559}
560
561/**
562 * befs_nls2utf - Convert NLS string to utf8 encodeing
563 * @sb: Superblock
Fabian Frederick817e1d92014-06-06 14:36:17 -0700564 * @in: Input string buffer in NLS format
565 * @in_len: Length of input string in bytes
566 * @out: The output string in UTF-8 format
567 * @out_len: Length of the output buffer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 *
Fabian Frederick817e1d92014-06-06 14:36:17 -0700569 * Converts input string @in, which is in the format of the loaded NLS map,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 * into a utf8 string.
571 *
Fabian Frederick817e1d92014-06-06 14:36:17 -0700572 * The destination string @out is allocated by this function and the caller is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 * responsible for freeing it with kfree()
574 *
Fabian Frederick817e1d92014-06-06 14:36:17 -0700575 * On return, *@out_len is the length of @out in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 *
577 * On success, the return value is the number of utf8 characters written to
Fabian Frederick817e1d92014-06-06 14:36:17 -0700578 * the output buffer @out.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 *
580 * On Failure, a negative number coresponding to the error code is returned.
581 */
582
583static int
584befs_nls2utf(struct super_block *sb, const char *in,
585 int in_len, char **out, int *out_len)
586{
587 struct nls_table *nls = BEFS_SB(sb)->nls;
588 int i, o;
589 wchar_t uni;
590 int unilen, utflen;
591 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700592 /* There're nls characters that will translate to 3-chars-wide UTF-8
593 * characters, a additional byte is needed to save the final \0
594 * in special cases */
595 int maxlen = (3 * in_len) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700597 befs_debug(sb, "---> %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
599 if (!nls) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700600 befs_error(sb, "%s called with no NLS table loaded.",
601 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 return -EINVAL;
603 }
604
605 *out = result = kmalloc(maxlen, GFP_NOFS);
606 if (!*out) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700607 befs_error(sb, "%s cannot allocate memory", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 *out_len = 0;
609 return -ENOMEM;
610 }
611
612 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
613
614 /* convert from nls to unicode */
615 unilen = nls->char2uni(&in[i], in_len - i, &uni);
Alan Stern74675a52009-04-30 10:08:18 -0400616 if (unilen < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 /* convert from unicode to UTF-8 */
Alan Stern74675a52009-04-30 10:08:18 -0400620 utflen = utf32_to_utf8(uni, &result[o], 3);
621 if (utflen <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 }
624
625 result[o] = '\0';
626 *out_len = o;
627
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700628 befs_debug(sb, "<--- %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630 return i;
631
632 conv_err:
633 befs_error(sb, "Name using charecter set %s contains a charecter that "
634 "cannot be converted to unicode.", nls->charset);
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700635 befs_debug(sb, "<--- %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 kfree(result);
637 return -EILSEQ;
638}
639
640/**
641 * Use the
642 *
643 */
644enum {
645 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
646};
647
Steven Whitehousea447c092008-10-13 10:46:57 +0100648static const match_table_t befs_tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 {Opt_uid, "uid=%d"},
650 {Opt_gid, "gid=%d"},
651 {Opt_charset, "iocharset=%s"},
652 {Opt_debug, "debug"},
653 {Opt_err, NULL}
654};
655
656static int
Fabian Frederick09ad0ea2015-04-16 12:46:17 -0700657parse_options(char *options, struct befs_mount_options *opts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658{
659 char *p;
660 substring_t args[MAX_OPT_ARGS];
661 int option;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800662 kuid_t uid;
663 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
665 /* Initialize options */
Eric W. Biederman31aba052012-02-10 10:51:24 -0800666 opts->uid = GLOBAL_ROOT_UID;
667 opts->gid = GLOBAL_ROOT_GID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 opts->use_uid = 0;
669 opts->use_gid = 0;
670 opts->iocharset = NULL;
671 opts->debug = 0;
672
673 if (!options)
674 return 1;
675
676 while ((p = strsep(&options, ",")) != NULL) {
677 int token;
678 if (!*p)
679 continue;
680
681 token = match_token(p, befs_tokens, args);
682 switch (token) {
683 case Opt_uid:
684 if (match_int(&args[0], &option))
685 return 0;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800686 uid = INVALID_UID;
687 if (option >= 0)
688 uid = make_kuid(current_user_ns(), option);
689 if (!uid_valid(uid)) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700690 pr_err("Invalid uid %d, "
691 "using default\n", option);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 break;
693 }
Eric W. Biederman31aba052012-02-10 10:51:24 -0800694 opts->uid = uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 opts->use_uid = 1;
696 break;
697 case Opt_gid:
698 if (match_int(&args[0], &option))
699 return 0;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800700 gid = INVALID_GID;
701 if (option >= 0)
702 gid = make_kgid(current_user_ns(), option);
703 if (!gid_valid(gid)) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700704 pr_err("Invalid gid %d, "
705 "using default\n", option);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 break;
707 }
Eric W. Biederman31aba052012-02-10 10:51:24 -0800708 opts->gid = gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 opts->use_gid = 1;
710 break;
711 case Opt_charset:
712 kfree(opts->iocharset);
713 opts->iocharset = match_strdup(&args[0]);
714 if (!opts->iocharset) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700715 pr_err("allocation failure for "
716 "iocharset string\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 return 0;
718 }
719 break;
720 case Opt_debug:
721 opts->debug = 1;
722 break;
723 default:
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700724 pr_err("Unrecognized mount option \"%s\" "
725 "or missing value\n", p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 return 0;
727 }
728 }
729 return 1;
730}
731
732/* This function has the responsibiltiy of getting the
733 * filesystem ready for unmounting.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300734 * Basically, we free everything that we allocated in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 * befs_read_inode
736 */
737static void
738befs_put_super(struct super_block *sb)
739{
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800740 kfree(BEFS_SB(sb)->mount_opts.iocharset);
741 BEFS_SB(sb)->mount_opts.iocharset = NULL;
Thomas Gleixner6d729e42009-08-16 21:05:08 +0000742 unload_nls(BEFS_SB(sb)->nls);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800743 kfree(sb->s_fs_info);
744 sb->s_fs_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745}
746
747/* Allocate private field of the superblock, fill it.
748 *
749 * Finish filling the public superblock fields
750 * Make the root directory
751 * Load a set of NLS translations if needed.
752 */
753static int
754befs_fill_super(struct super_block *sb, void *data, int silent)
755{
756 struct buffer_head *bh;
Fabian Frederick038428f2015-04-16 12:46:20 -0700757 struct befs_sb_info *befs_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 befs_super_block *disk_sb;
759 struct inode *root;
David Howells96eb5412008-02-07 00:15:31 -0800760 long ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 const unsigned long sb_block = 0;
762 const off_t x86_sb_off = 512;
763
Miklos Szeredi552c3c62008-02-08 04:21:38 -0800764 save_mount_options(sb, data);
765
Fabian Frederick2d4319e2014-04-03 14:50:21 -0700766 sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 if (sb->s_fs_info == NULL) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700768 pr_err("(%s): Unable to allocate memory for private "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 "portion of superblock. Bailing.\n", sb->s_id);
Adrian Bunk04187262006-06-30 18:23:04 +0200770 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 }
772 befs_sb = BEFS_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
774 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
775 befs_error(sb, "cannot parse mount options");
Adrian Bunk04187262006-06-30 18:23:04 +0200776 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 }
778
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700779 befs_debug(sb, "---> %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 if (!(sb->s_flags & MS_RDONLY)) {
782 befs_warning(sb,
783 "No write support. Marking filesystem read-only");
784 sb->s_flags |= MS_RDONLY;
785 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 /*
788 * Set dummy blocksize to read super block.
789 * Will be set to real fs blocksize later.
790 *
791 * Linux 2.4.10 and later refuse to read blocks smaller than
792 * the hardsect size for the device. But we also need to read at
793 * least 1k to get the second 512 bytes of the volume.
794 * -WD 10-26-01
795 */
796 sb_min_blocksize(sb, 1024);
797
798 if (!(bh = sb_bread(sb, sb_block))) {
799 befs_error(sb, "unable to read superblock");
Adrian Bunk04187262006-06-30 18:23:04 +0200800 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 }
802
803 /* account for offset of super block on x86 */
804 disk_sb = (befs_super_block *) bh->b_data;
Harvey Harrison152b95a2008-10-15 22:04:03 -0700805 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
806 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 befs_debug(sb, "Using PPC superblock location");
808 } else {
809 befs_debug(sb, "Using x86 superblock location");
810 disk_sb =
811 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
812 }
813
Fabian Frederick8e191892014-08-08 14:20:31 -0700814 if ((befs_load_sb(sb, disk_sb) != BEFS_OK) ||
815 (befs_check_sb(sb) != BEFS_OK))
Adrian Bunk04187262006-06-30 18:23:04 +0200816 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
818 befs_dump_super_block(sb, disk_sb);
819
820 brelse(bh);
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 if( befs_sb->num_blocks > ~((sector_t)0) ) {
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700823 befs_error(sb, "blocks count: %llu "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 "is larger than the host can use",
825 befs_sb->num_blocks);
Adrian Bunk04187262006-06-30 18:23:04 +0200826 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 }
828
829 /*
830 * set up enough so that it can read an inode
831 * Fill in kernel superblock fields from private sb
832 */
833 sb->s_magic = BEFS_SUPER_MAGIC;
834 /* Set real blocksize of fs */
835 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700836 sb->s_op = &befs_sops;
David Howells96eb5412008-02-07 00:15:31 -0800837 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
838 if (IS_ERR(root)) {
839 ret = PTR_ERR(root);
840 goto unacquire_priv_sbp;
841 }
Al Viro48fde702012-01-08 22:15:13 -0500842 sb->s_root = d_make_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 if (!sb->s_root) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 befs_error(sb, "get root inode failed");
Adrian Bunk04187262006-06-30 18:23:04 +0200845 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 }
847
848 /* load nls library */
849 if (befs_sb->mount_opts.iocharset) {
850 befs_debug(sb, "Loading nls: %s",
851 befs_sb->mount_opts.iocharset);
852 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
853 if (!befs_sb->nls) {
854 befs_warning(sb, "Cannot load nls %s"
855 " loading default nls",
856 befs_sb->mount_opts.iocharset);
857 befs_sb->nls = load_nls_default();
858 }
859 /* load default nls if none is specified in mount options */
860 } else {
861 befs_debug(sb, "Loading default nls");
862 befs_sb->nls = load_nls_default();
863 }
864
865 return 0;
866/*****************/
Adrian Bunk04187262006-06-30 18:23:04 +0200867 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 brelse(bh);
869
Adrian Bunk04187262006-06-30 18:23:04 +0200870 unacquire_priv_sbp:
Al Viro8dd5ca52010-01-28 22:11:38 -0500871 kfree(befs_sb->mount_opts.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 kfree(sb->s_fs_info);
873
Adrian Bunk04187262006-06-30 18:23:04 +0200874 unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 sb->s_fs_info = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800876 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877}
878
879static int
880befs_remount(struct super_block *sb, int *flags, char *data)
881{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400882 sync_filesystem(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 if (!(*flags & MS_RDONLY))
884 return -EINVAL;
885 return 0;
886}
887
888static int
David Howells726c3342006-06-23 02:02:58 -0700889befs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890{
David Howells726c3342006-06-23 02:02:58 -0700891 struct super_block *sb = dentry->d_sb;
Coly Li85872462009-04-02 16:59:32 -0700892 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700894 befs_debug(sb, "---> %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
896 buf->f_type = BEFS_SUPER_MAGIC;
897 buf->f_bsize = sb->s_blocksize;
898 buf->f_blocks = BEFS_SB(sb)->num_blocks;
899 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
900 buf->f_bavail = buf->f_bfree;
901 buf->f_files = 0; /* UNKNOWN */
902 buf->f_ffree = 0; /* UNKNOWN */
Coly Li85872462009-04-02 16:59:32 -0700903 buf->f_fsid.val[0] = (u32)id;
904 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 buf->f_namelen = BEFS_NAME_LEN;
906
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700907 befs_debug(sb, "<--- %s", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
909 return 0;
910}
911
Al Viro152a0832010-07-25 00:46:55 +0400912static struct dentry *
913befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
914 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915{
Al Viro152a0832010-07-25 00:46:55 +0400916 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917}
918
919static struct file_system_type befs_fs_type = {
920 .owner = THIS_MODULE,
921 .name = "befs",
Al Viro152a0832010-07-25 00:46:55 +0400922 .mount = befs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 .kill_sb = kill_block_super,
924 .fs_flags = FS_REQUIRES_DEV,
925};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800926MODULE_ALIAS_FS("befs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927
928static int __init
929init_befs_fs(void)
930{
931 int err;
932
Fabian Frederickdac52fc2014-04-03 14:50:23 -0700933 pr_info("version: %s\n", BEFS_VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 err = befs_init_inodecache();
936 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200937 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
939 err = register_filesystem(&befs_fs_type);
940 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200941 goto unacquire_inodecache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943 return 0;
944
Adrian Bunk04187262006-06-30 18:23:04 +0200945unacquire_inodecache:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 befs_destroy_inodecache();
947
Adrian Bunk04187262006-06-30 18:23:04 +0200948unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 return err;
950}
951
952static void __exit
953exit_befs_fs(void)
954{
955 befs_destroy_inodecache();
956
957 unregister_filesystem(&befs_fs_type);
958}
959
960/*
961Macros that typecheck the init and exit functions,
962ensures that they are called at init and cleanup,
963and eliminates warnings about unused functions.
964*/
965module_init(init_befs_fs)
966module_exit(exit_befs_fs)