blob: a8e37f81d097b0934760789836e4dbc0574fb014 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/bfs/inode.c
3 * BFS superblock and inode operations.
Tigran Aivazian69688262006-12-13 00:35:14 -08004 * Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
Andrew Stribblehillfac92be2005-09-09 13:02:04 -07006 *
7 * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
9
10#include <linux/module.h>
11#include <linux/mm.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/buffer_head.h>
16#include <linux/vfs.h>
Christoph Hellwiga9185b42010-03-05 09:21:37 +010017#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <asm/uaccess.h>
19#include "bfs.h"
20
Tigran Aivazian69688262006-12-13 00:35:14 -080021MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070022MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
23MODULE_LICENSE("GPL");
24
25#undef DEBUG
26
27#ifdef DEBUG
28#define dprintf(x...) printf(x)
29#else
30#define dprintf(x...)
31#endif
32
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080033void dump_imap(const char *prefix, struct super_block *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
David Howellse33ab082008-02-07 00:15:32 -080035struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080037 struct bfs_inode *di;
David Howellse33ab082008-02-07 00:15:32 -080038 struct inode *inode;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080039 struct buffer_head *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 int block, off;
41
David Howellse33ab082008-02-07 00:15:32 -080042 inode = iget_locked(sb, ino);
43 if (IS_ERR(inode))
44 return ERR_PTR(-ENOMEM);
45 if (!(inode->i_state & I_NEW))
46 return inode;
47
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080048 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
David Howellse33ab082008-02-07 00:15:32 -080050 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 }
52
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080053 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 bh = sb_bread(inode->i_sb, block);
55 if (!bh) {
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080056 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
57 ino);
David Howellse33ab082008-02-07 00:15:32 -080058 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 }
60
61 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
62 di = (struct bfs_inode *)bh->b_data + off;
63
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080064 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070065 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 inode->i_mode |= S_IFDIR;
67 inode->i_op = &bfs_dir_inops;
68 inode->i_fop = &bfs_dir_operations;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070069 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 inode->i_mode |= S_IFREG;
71 inode->i_op = &bfs_file_inops;
72 inode->i_fop = &bfs_file_operations;
73 inode->i_mapping->a_ops = &bfs_aops;
74 }
75
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070076 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
77 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080078 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070079 inode->i_uid = le32_to_cpu(di->i_uid);
80 inode->i_gid = le32_to_cpu(di->i_gid);
81 inode->i_nlink = le32_to_cpu(di->i_nlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 inode->i_size = BFS_FILESIZE(di);
83 inode->i_blocks = BFS_FILEBLOCKS(di);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070084 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
85 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
86 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 inode->i_atime.tv_nsec = 0;
88 inode->i_mtime.tv_nsec = 0;
89 inode->i_ctime.tv_nsec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 brelse(bh);
David Howellse33ab082008-02-07 00:15:32 -080092 unlock_new_inode(inode);
93 return inode;
94
95error:
96 iget_failed(inode);
97 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
Al Viro9df2f852010-06-06 09:50:39 -0400100static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p)
101{
102 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) {
103 printf("Bad inode number %s:%08x\n", sb->s_id, ino);
104 return ERR_PTR(-EIO);
105 }
106
107 ino -= BFS_ROOT_INO;
108
109 *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK);
110 if (!*p) {
111 printf("Unable to read inode %s:%08x\n", sb->s_id, ino);
112 return ERR_PTR(-EIO);
113 }
114
115 return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK;
116}
117
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100118static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
Al Viro4427f0c2009-06-08 01:15:58 -0400120 struct bfs_sb_info *info = BFS_SB(inode->i_sb);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700121 unsigned int ino = (u16)inode->i_ino;
122 unsigned long i_sblock;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800123 struct bfs_inode *di;
124 struct buffer_head *bh;
Al Viro4427f0c2009-06-08 01:15:58 -0400125 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700127 dprintf("ino=%08x\n", ino);
128
Al Viro9df2f852010-06-06 09:50:39 -0400129 di = find_inode(inode->i_sb, ino, &bh);
130 if (IS_ERR(di))
131 return PTR_ERR(di);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700133 mutex_lock(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700135 if (ino == BFS_ROOT_INO)
136 di->i_vtype = cpu_to_le32(BFS_VDIR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 else
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700138 di->i_vtype = cpu_to_le32(BFS_VREG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700140 di->i_ino = cpu_to_le16(ino);
141 di->i_mode = cpu_to_le32(inode->i_mode);
142 di->i_uid = cpu_to_le32(inode->i_uid);
143 di->i_gid = cpu_to_le32(inode->i_gid);
144 di->i_nlink = cpu_to_le32(inode->i_nlink);
145 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
146 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
147 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
148 i_sblock = BFS_I(inode)->i_sblock;
149 di->i_sblock = cpu_to_le32(i_sblock);
150 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
151 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153 mark_buffer_dirty(bh);
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100154 if (wbc->sync_mode == WB_SYNC_ALL) {
Al Viro4427f0c2009-06-08 01:15:58 -0400155 sync_dirty_buffer(bh);
156 if (buffer_req(bh) && !buffer_uptodate(bh))
157 err = -EIO;
158 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 brelse(bh);
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700160 mutex_unlock(&info->bfs_lock);
Al Viro4427f0c2009-06-08 01:15:58 -0400161 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
163
Al Viro9df2f852010-06-06 09:50:39 -0400164static void bfs_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
166 unsigned long ino = inode->i_ino;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800167 struct bfs_inode *di;
168 struct buffer_head *bh;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800169 struct super_block *s = inode->i_sb;
170 struct bfs_sb_info *info = BFS_SB(s);
171 struct bfs_inode_info *bi = BFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700173 dprintf("ino=%08lx\n", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Mark Fashehfef26652005-09-09 13:01:31 -0700175 truncate_inode_pages(&inode->i_data, 0);
Al Viro9df2f852010-06-06 09:50:39 -0400176 invalidate_inode_buffers(inode);
177 end_writeback(inode);
Mark Fashehfef26652005-09-09 13:01:31 -0700178
Al Viro9df2f852010-06-06 09:50:39 -0400179 if (inode->i_nlink)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 return;
Al Viro9df2f852010-06-06 09:50:39 -0400181
182 di = find_inode(s, inode->i_ino, &bh);
183 if (IS_ERR(di))
184 return;
185
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700186 mutex_lock(&info->bfs_lock);
Al Viro9df2f852010-06-06 09:50:39 -0400187 /* clear on-disk inode */
188 memset(di, 0, sizeof(struct bfs_inode));
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800189 mark_buffer_dirty(bh);
190 brelse(bh);
191
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700192 if (bi->i_dsk_ino) {
Al Viro7e46aa52007-12-05 08:32:52 +0000193 if (bi->i_sblock)
194 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 info->si_freei++;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700196 clear_bit(ino, info->si_imap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 dump_imap("delete_inode", s);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700198 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800200 /*
201 * If this was the last file, make the previous block
202 * "last block of the last file" even if there is no
203 * real file there, saves us 1 gap.
204 */
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300205 if (info->si_lf_eblk == bi->i_eblock)
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800206 info->si_lf_eblk = bi->i_sblock - 1;
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700207 mutex_unlock(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208}
209
210static void bfs_put_super(struct super_block *s)
211{
212 struct bfs_sb_info *info = BFS_SB(s);
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700213
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800214 if (!info)
215 return;
216
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700217 mutex_destroy(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 kfree(info->si_imap);
219 kfree(info);
220 s->s_fs_info = NULL;
221}
222
David Howells726c3342006-06-23 02:02:58 -0700223static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
David Howells726c3342006-06-23 02:02:58 -0700225 struct super_block *s = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 struct bfs_sb_info *info = BFS_SB(s);
227 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
228 buf->f_type = BFS_MAGIC;
229 buf->f_bsize = s->s_blocksize;
230 buf->f_blocks = info->si_blocks;
231 buf->f_bfree = buf->f_bavail = info->si_freeb;
232 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
233 buf->f_ffree = info->si_freei;
234 buf->f_fsid.val[0] = (u32)id;
235 buf->f_fsid.val[1] = (u32)(id >> 32);
236 buf->f_namelen = BFS_NAMELEN;
237 return 0;
238}
239
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800240static struct kmem_cache *bfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242static struct inode *bfs_alloc_inode(struct super_block *sb)
243{
244 struct bfs_inode_info *bi;
Christoph Lametere94b1762006-12-06 20:33:17 -0800245 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 if (!bi)
247 return NULL;
248 return &bi->vfs_inode;
249}
250
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100251static void bfs_i_callback(struct rcu_head *head)
252{
253 struct inode *inode = container_of(head, struct inode, i_rcu);
254 INIT_LIST_HEAD(&inode->i_dentry);
255 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
256}
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258static void bfs_destroy_inode(struct inode *inode)
259{
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100260 call_rcu(&inode->i_rcu, bfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261}
262
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700263static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
265 struct bfs_inode_info *bi = foo;
266
Christoph Lametera35afb82007-05-16 22:10:57 -0700267 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268}
Paul Mundt20c2df82007-07-20 10:11:58 +0900269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270static int init_inodecache(void)
271{
272 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
273 sizeof(struct bfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800274 0, (SLAB_RECLAIM_ACCOUNT|
275 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900276 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 if (bfs_inode_cachep == NULL)
278 return -ENOMEM;
279 return 0;
280}
281
282static void destroy_inodecache(void)
283{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700284 kmem_cache_destroy(bfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285}
286
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800287static const struct super_operations bfs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 .alloc_inode = bfs_alloc_inode,
289 .destroy_inode = bfs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 .write_inode = bfs_write_inode,
Al Viro9df2f852010-06-06 09:50:39 -0400291 .evict_inode = bfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 .put_super = bfs_put_super,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 .statfs = bfs_statfs,
294};
295
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800296void dump_imap(const char *prefix, struct super_block *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700298#ifdef DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 int i;
300 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
301
302 if (!tmpbuf)
303 return;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800304 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
305 if (i > PAGE_SIZE - 100) break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 if (test_bit(i, BFS_SB(s)->si_imap))
307 strcat(tmpbuf, "1");
308 else
309 strcat(tmpbuf, "0");
310 }
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800311 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
312 prefix, BFS_SB(s)->si_lasti, tmpbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 free_page((unsigned long)tmpbuf);
314#endif
315}
316
317static int bfs_fill_super(struct super_block *s, void *data, int silent)
318{
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300319 struct buffer_head *bh, *sbh;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800320 struct bfs_super_block *bfs_sb;
321 struct inode *inode;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700322 unsigned i, imap_len;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800323 struct bfs_sb_info *info;
Al Viro59986492010-01-24 00:52:22 -0500324 int ret = -EINVAL;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800325 unsigned long i_sblock, i_eblock, i_eoff, s_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700327 info = kzalloc(sizeof(*info), GFP_KERNEL);
Jan Blunckba13d592010-02-24 13:25:29 +0100328 if (!info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 return -ENOMEM;
Al Viro59986492010-01-24 00:52:22 -0500330 mutex_init(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 s->s_fs_info = info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333 sb_set_blocksize(s, BFS_BSIZE);
334
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300335 sbh = sb_bread(s, 0);
336 if (!sbh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 goto out;
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300338 bfs_sb = (struct bfs_super_block *)sbh->b_data;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700339 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 if (!silent)
341 printf("No BFS filesystem on %s (magic=%08x)\n",
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700342 s->s_id, le32_to_cpu(bfs_sb->s_magic));
Al Viro59986492010-01-24 00:52:22 -0500343 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
345 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
346 printf("%s is unclean, continuing\n", s->s_id);
347
348 s->s_magic = BFS_MAGIC;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800349
350 if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
351 printf("Superblock is corrupted\n");
Al Viro59986492010-01-24 00:52:22 -0500352 goto out1;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800353 }
354
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800355 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
356 sizeof(struct bfs_inode)
357 + BFS_ROOT_INO - 1;
358 imap_len = (info->si_lasti / 8) + 1;
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700359 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (!info->si_imap)
Al Viro59986492010-01-24 00:52:22 -0500361 goto out1;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800362 for (i = 0; i < BFS_ROOT_INO; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 set_bit(i, info->si_imap);
364
365 s->s_op = &bfs_sops;
David Howellse33ab082008-02-07 00:15:32 -0800366 inode = bfs_iget(s, BFS_ROOT_INO);
367 if (IS_ERR(inode)) {
368 ret = PTR_ERR(inode);
Al Viro59986492010-01-24 00:52:22 -0500369 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
371 s->s_root = d_alloc_root(inode);
372 if (!s->s_root) {
373 iput(inode);
David Howellse33ab082008-02-07 00:15:32 -0800374 ret = -ENOMEM;
Al Viro59986492010-01-24 00:52:22 -0500375 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 }
377
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800378 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
379 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
380 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 info->si_freei = 0;
382 info->si_lf_eblk = 0;
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800383
384 /* can we read the last block? */
385 bh = sb_bread(s, info->si_blocks - 1);
386 if (!bh) {
387 printf("Last block not available: %lu\n", info->si_blocks - 1);
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800388 ret = -EIO;
Al Viro59986492010-01-24 00:52:22 -0500389 goto out3;
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800390 }
391 brelse(bh);
392
Al Viroc2b513d2005-10-04 17:48:44 +0100393 bh = NULL;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800394 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
Al Viroc2b513d2005-10-04 17:48:44 +0100395 struct bfs_inode *di;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800396 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
Al Viroc2b513d2005-10-04 17:48:44 +0100397 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
Dmitri Vorobiev75b25b42008-07-25 19:44:52 -0700398 unsigned long eblock;
Al Viroc2b513d2005-10-04 17:48:44 +0100399
400 if (!off) {
401 brelse(bh);
402 bh = sb_bread(s, block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 }
Al Viroc2b513d2005-10-04 17:48:44 +0100404
405 if (!bh)
406 continue;
407
408 di = (struct bfs_inode *)bh->b_data + off;
409
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800410 /* test if filesystem is not corrupted */
411
412 i_eoff = le32_to_cpu(di->i_eoffset);
413 i_sblock = le32_to_cpu(di->i_sblock);
414 i_eblock = le32_to_cpu(di->i_eblock);
415 s_size = le32_to_cpu(bfs_sb->s_end);
416
417 if (i_sblock > info->si_blocks ||
418 i_eblock > info->si_blocks ||
419 i_sblock > i_eblock ||
420 i_eoff > s_size ||
421 i_sblock * BFS_BSIZE > i_eoff) {
422
423 printf("Inode 0x%08x corrupted\n", i);
424
425 brelse(bh);
Al Viro59986492010-01-24 00:52:22 -0500426 ret = -EIO;
427 goto out3;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800428 }
429
Al Viroc2b513d2005-10-04 17:48:44 +0100430 if (!di->i_ino) {
431 info->si_freei++;
432 continue;
433 }
434 set_bit(i, info->si_imap);
435 info->si_freeb -= BFS_FILEBLOCKS(di);
436
Al Viroc2b513d2005-10-04 17:48:44 +0100437 eblock = le32_to_cpu(di->i_eblock);
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800438 if (eblock > info->si_lf_eblk)
Al Viroc2b513d2005-10-04 17:48:44 +0100439 info->si_lf_eblk = eblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 }
Al Viroc2b513d2005-10-04 17:48:44 +0100441 brelse(bh);
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300442 brelse(sbh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 dump_imap("read_super", s);
444 return 0;
445
Al Viro59986492010-01-24 00:52:22 -0500446out3:
447 dput(s->s_root);
448 s->s_root = NULL;
449out2:
450 kfree(info->si_imap);
451out1:
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300452 brelse(sbh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453out:
Al Viro59986492010-01-24 00:52:22 -0500454 mutex_destroy(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 kfree(info);
456 s->s_fs_info = NULL;
David Howellse33ab082008-02-07 00:15:32 -0800457 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459
Al Viro152a0832010-07-25 00:46:55 +0400460static struct dentry *bfs_mount(struct file_system_type *fs_type,
461 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Al Viro152a0832010-07-25 00:46:55 +0400463 return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
465
466static struct file_system_type bfs_fs_type = {
467 .owner = THIS_MODULE,
468 .name = "bfs",
Al Viro152a0832010-07-25 00:46:55 +0400469 .mount = bfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 .kill_sb = kill_block_super,
471 .fs_flags = FS_REQUIRES_DEV,
472};
473
474static int __init init_bfs_fs(void)
475{
476 int err = init_inodecache();
477 if (err)
478 goto out1;
479 err = register_filesystem(&bfs_fs_type);
480 if (err)
481 goto out;
482 return 0;
483out:
484 destroy_inodecache();
485out1:
486 return err;
487}
488
489static void __exit exit_bfs_fs(void)
490{
491 unregister_filesystem(&bfs_fs_type);
492 destroy_inodecache();
493}
494
495module_init(init_bfs_fs)
496module_exit(exit_bfs_fs)