blob: 7041ac35ace85ab7f91d96b21f0dde3c54840257 [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);
Dan Carpenter821ff772013-08-14 12:51:03 +030043 if (!inode)
David Howellse33ab082008-02-07 00:15:32 -080044 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);
Eric W. Biederman7f5b82b2012-04-25 03:57:31 -070079 i_uid_write(inode, le32_to_cpu(di->i_uid));
80 i_gid_write(inode, le32_to_cpu(di->i_gid));
Miklos Szeredibfe86842011-10-28 14:13:29 +020081 set_nlink(inode, 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);
Eric W. Biederman7f5b82b2012-04-25 03:57:31 -0700142 di->i_uid = cpu_to_le32(i_uid_read(inode));
143 di->i_gid = cpu_to_le32(i_gid_read(inode));
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700144 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
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700175 truncate_inode_pages_final(&inode->i_data);
Al Viro9df2f852010-06-06 09:50:39 -0400176 invalidate_inode_buffers(inode);
Jan Karadbd57682012-05-03 14:48:02 +0200177 clear_inode(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 Pigginfa0d7e3d2011-01-07 17:49:49 +1100251static void bfs_i_callback(struct rcu_head *head)
252{
253 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100254 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
255}
256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257static void bfs_destroy_inode(struct inode *inode)
258{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100259 call_rcu(&inode->i_rcu, bfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700262static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
264 struct bfs_inode_info *bi = foo;
265
Christoph Lametera35afb82007-05-16 22:10:57 -0700266 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267}
Paul Mundt20c2df82007-07-20 10:11:58 +0900268
Fabian Frederick758b4442014-04-07 15:39:02 -0700269static int __init init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270{
271 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
272 sizeof(struct bfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800273 0, (SLAB_RECLAIM_ACCOUNT|
274 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900275 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 if (bfs_inode_cachep == NULL)
277 return -ENOMEM;
278 return 0;
279}
280
281static void destroy_inodecache(void)
282{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000283 /*
284 * Make sure all delayed rcu free inodes are flushed before we
285 * destroy cache.
286 */
287 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700288 kmem_cache_destroy(bfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800291static const struct super_operations bfs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 .alloc_inode = bfs_alloc_inode,
293 .destroy_inode = bfs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 .write_inode = bfs_write_inode,
Al Viro9df2f852010-06-06 09:50:39 -0400295 .evict_inode = bfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 .put_super = bfs_put_super,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 .statfs = bfs_statfs,
298};
299
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800300void dump_imap(const char *prefix, struct super_block *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700302#ifdef DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 int i;
304 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
305
306 if (!tmpbuf)
307 return;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800308 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
309 if (i > PAGE_SIZE - 100) break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 if (test_bit(i, BFS_SB(s)->si_imap))
311 strcat(tmpbuf, "1");
312 else
313 strcat(tmpbuf, "0");
314 }
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800315 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
316 prefix, BFS_SB(s)->si_lasti, tmpbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 free_page((unsigned long)tmpbuf);
318#endif
319}
320
321static int bfs_fill_super(struct super_block *s, void *data, int silent)
322{
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300323 struct buffer_head *bh, *sbh;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800324 struct bfs_super_block *bfs_sb;
325 struct inode *inode;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700326 unsigned i, imap_len;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800327 struct bfs_sb_info *info;
Al Viro59986492010-01-24 00:52:22 -0500328 int ret = -EINVAL;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800329 unsigned long i_sblock, i_eblock, i_eoff, s_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700331 info = kzalloc(sizeof(*info), GFP_KERNEL);
Jan Blunckba13d592010-02-24 13:25:29 +0100332 if (!info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return -ENOMEM;
Al Viro59986492010-01-24 00:52:22 -0500334 mutex_init(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 s->s_fs_info = info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 sb_set_blocksize(s, BFS_BSIZE);
338
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300339 sbh = sb_bread(s, 0);
340 if (!sbh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 goto out;
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300342 bfs_sb = (struct bfs_super_block *)sbh->b_data;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700343 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 if (!silent)
345 printf("No BFS filesystem on %s (magic=%08x)\n",
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700346 s->s_id, le32_to_cpu(bfs_sb->s_magic));
Al Viro59986492010-01-24 00:52:22 -0500347 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 }
349 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
350 printf("%s is unclean, continuing\n", s->s_id);
351
352 s->s_magic = BFS_MAGIC;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800353
354 if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
355 printf("Superblock is corrupted\n");
Al Viro59986492010-01-24 00:52:22 -0500356 goto out1;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800357 }
358
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800359 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
360 sizeof(struct bfs_inode)
361 + BFS_ROOT_INO - 1;
362 imap_len = (info->si_lasti / 8) + 1;
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700363 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 if (!info->si_imap)
Al Viro59986492010-01-24 00:52:22 -0500365 goto out1;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800366 for (i = 0; i < BFS_ROOT_INO; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 set_bit(i, info->si_imap);
368
369 s->s_op = &bfs_sops;
David Howellse33ab082008-02-07 00:15:32 -0800370 inode = bfs_iget(s, BFS_ROOT_INO);
371 if (IS_ERR(inode)) {
372 ret = PTR_ERR(inode);
Al Viro59986492010-01-24 00:52:22 -0500373 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 }
Al Viro48fde702012-01-08 22:15:13 -0500375 s->s_root = d_make_root(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 if (!s->s_root) {
David Howellse33ab082008-02-07 00:15:32 -0800377 ret = -ENOMEM;
Al Viro59986492010-01-24 00:52:22 -0500378 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 }
380
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800381 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
382 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
383 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 info->si_freei = 0;
385 info->si_lf_eblk = 0;
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800386
387 /* can we read the last block? */
388 bh = sb_bread(s, info->si_blocks - 1);
389 if (!bh) {
390 printf("Last block not available: %lu\n", info->si_blocks - 1);
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800391 ret = -EIO;
Al Viro59986492010-01-24 00:52:22 -0500392 goto out3;
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800393 }
394 brelse(bh);
395
Al Viroc2b513d2005-10-04 17:48:44 +0100396 bh = NULL;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800397 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
Al Viroc2b513d2005-10-04 17:48:44 +0100398 struct bfs_inode *di;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800399 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
Al Viroc2b513d2005-10-04 17:48:44 +0100400 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
Dmitri Vorobiev75b25b42008-07-25 19:44:52 -0700401 unsigned long eblock;
Al Viroc2b513d2005-10-04 17:48:44 +0100402
403 if (!off) {
404 brelse(bh);
405 bh = sb_bread(s, block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 }
Al Viroc2b513d2005-10-04 17:48:44 +0100407
408 if (!bh)
409 continue;
410
411 di = (struct bfs_inode *)bh->b_data + off;
412
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800413 /* test if filesystem is not corrupted */
414
415 i_eoff = le32_to_cpu(di->i_eoffset);
416 i_sblock = le32_to_cpu(di->i_sblock);
417 i_eblock = le32_to_cpu(di->i_eblock);
418 s_size = le32_to_cpu(bfs_sb->s_end);
419
420 if (i_sblock > info->si_blocks ||
421 i_eblock > info->si_blocks ||
422 i_sblock > i_eblock ||
423 i_eoff > s_size ||
424 i_sblock * BFS_BSIZE > i_eoff) {
425
426 printf("Inode 0x%08x corrupted\n", i);
427
428 brelse(bh);
Al Viro59986492010-01-24 00:52:22 -0500429 ret = -EIO;
430 goto out3;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800431 }
432
Al Viroc2b513d2005-10-04 17:48:44 +0100433 if (!di->i_ino) {
434 info->si_freei++;
435 continue;
436 }
437 set_bit(i, info->si_imap);
438 info->si_freeb -= BFS_FILEBLOCKS(di);
439
Al Viroc2b513d2005-10-04 17:48:44 +0100440 eblock = le32_to_cpu(di->i_eblock);
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800441 if (eblock > info->si_lf_eblk)
Al Viroc2b513d2005-10-04 17:48:44 +0100442 info->si_lf_eblk = eblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 }
Al Viroc2b513d2005-10-04 17:48:44 +0100444 brelse(bh);
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300445 brelse(sbh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 dump_imap("read_super", s);
447 return 0;
448
Al Viro59986492010-01-24 00:52:22 -0500449out3:
450 dput(s->s_root);
451 s->s_root = NULL;
452out2:
453 kfree(info->si_imap);
454out1:
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300455 brelse(sbh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456out:
Al Viro59986492010-01-24 00:52:22 -0500457 mutex_destroy(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 kfree(info);
459 s->s_fs_info = NULL;
David Howellse33ab082008-02-07 00:15:32 -0800460 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461}
462
Al Viro152a0832010-07-25 00:46:55 +0400463static struct dentry *bfs_mount(struct file_system_type *fs_type,
464 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
Al Viro152a0832010-07-25 00:46:55 +0400466 return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467}
468
469static struct file_system_type bfs_fs_type = {
470 .owner = THIS_MODULE,
471 .name = "bfs",
Al Viro152a0832010-07-25 00:46:55 +0400472 .mount = bfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 .kill_sb = kill_block_super,
474 .fs_flags = FS_REQUIRES_DEV,
475};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800476MODULE_ALIAS_FS("bfs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478static int __init init_bfs_fs(void)
479{
480 int err = init_inodecache();
481 if (err)
482 goto out1;
483 err = register_filesystem(&bfs_fs_type);
484 if (err)
485 goto out;
486 return 0;
487out:
488 destroy_inodecache();
489out1:
490 return err;
491}
492
493static void __exit exit_bfs_fs(void)
494{
495 unregister_filesystem(&bfs_fs_type);
496 destroy_inodecache();
497}
498
499module_init(init_bfs_fs)
500module_exit(exit_bfs_fs)