blob: fdcb4d69f430db6370e1eed7c1c04c9a3f333746 [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>
Christoph Hellwige2e40f22015-02-22 08:58:50 -080018#include <linux/uio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/uaccess.h>
20#include "bfs.h"
21
Tigran Aivazian69688262006-12-13 00:35:14 -080022MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070023MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
24MODULE_LICENSE("GPL");
25
26#undef DEBUG
27
28#ifdef DEBUG
29#define dprintf(x...) printf(x)
30#else
31#define dprintf(x...)
32#endif
33
David Howellse33ab082008-02-07 00:15:32 -080034struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080036 struct bfs_inode *di;
David Howellse33ab082008-02-07 00:15:32 -080037 struct inode *inode;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080038 struct buffer_head *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 int block, off;
40
David Howellse33ab082008-02-07 00:15:32 -080041 inode = iget_locked(sb, ino);
Dan Carpenter821ff772013-08-14 12:51:03 +030042 if (!inode)
David Howellse33ab082008-02-07 00:15:32 -080043 return ERR_PTR(-ENOMEM);
44 if (!(inode->i_state & I_NEW))
45 return inode;
46
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080047 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
David Howellse33ab082008-02-07 00:15:32 -080049 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 }
51
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080052 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 bh = sb_bread(inode->i_sb, block);
54 if (!bh) {
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080055 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
56 ino);
David Howellse33ab082008-02-07 00:15:32 -080057 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 }
59
60 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
61 di = (struct bfs_inode *)bh->b_data + off;
62
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080063 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070064 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 inode->i_mode |= S_IFDIR;
66 inode->i_op = &bfs_dir_inops;
67 inode->i_fop = &bfs_dir_operations;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070068 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 inode->i_mode |= S_IFREG;
70 inode->i_op = &bfs_file_inops;
71 inode->i_fop = &bfs_file_operations;
72 inode->i_mapping->a_ops = &bfs_aops;
73 }
74
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070075 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
76 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
Dmitri Vorobievf433dc52007-11-14 16:59:47 -080077 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
Eric W. Biederman7f5b82b2012-04-25 03:57:31 -070078 i_uid_write(inode, le32_to_cpu(di->i_uid));
79 i_gid_write(inode, le32_to_cpu(di->i_gid));
Miklos Szeredibfe86842011-10-28 14:13:29 +020080 set_nlink(inode, le32_to_cpu(di->i_nlink));
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 inode->i_size = BFS_FILESIZE(di);
82 inode->i_blocks = BFS_FILEBLOCKS(di);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -070083 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
84 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
85 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 inode->i_atime.tv_nsec = 0;
87 inode->i_mtime.tv_nsec = 0;
88 inode->i_ctime.tv_nsec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90 brelse(bh);
David Howellse33ab082008-02-07 00:15:32 -080091 unlock_new_inode(inode);
92 return inode;
93
94error:
95 iget_failed(inode);
96 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
Al Viro9df2f852010-06-06 09:50:39 -040099static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p)
100{
101 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) {
102 printf("Bad inode number %s:%08x\n", sb->s_id, ino);
103 return ERR_PTR(-EIO);
104 }
105
106 ino -= BFS_ROOT_INO;
107
108 *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK);
109 if (!*p) {
110 printf("Unable to read inode %s:%08x\n", sb->s_id, ino);
111 return ERR_PTR(-EIO);
112 }
113
114 return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK;
115}
116
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100117static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
Al Viro4427f0c2009-06-08 01:15:58 -0400119 struct bfs_sb_info *info = BFS_SB(inode->i_sb);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700120 unsigned int ino = (u16)inode->i_ino;
121 unsigned long i_sblock;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800122 struct bfs_inode *di;
123 struct buffer_head *bh;
Al Viro4427f0c2009-06-08 01:15:58 -0400124 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700126 dprintf("ino=%08x\n", ino);
127
Al Viro9df2f852010-06-06 09:50:39 -0400128 di = find_inode(inode->i_sb, ino, &bh);
129 if (IS_ERR(di))
130 return PTR_ERR(di);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700132 mutex_lock(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700134 if (ino == BFS_ROOT_INO)
135 di->i_vtype = cpu_to_le32(BFS_VDIR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 else
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700137 di->i_vtype = cpu_to_le32(BFS_VREG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700139 di->i_ino = cpu_to_le16(ino);
140 di->i_mode = cpu_to_le32(inode->i_mode);
Eric W. Biederman7f5b82b2012-04-25 03:57:31 -0700141 di->i_uid = cpu_to_le32(i_uid_read(inode));
142 di->i_gid = cpu_to_le32(i_gid_read(inode));
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700143 di->i_nlink = cpu_to_le32(inode->i_nlink);
144 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
145 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
146 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
147 i_sblock = BFS_I(inode)->i_sblock;
148 di->i_sblock = cpu_to_le32(i_sblock);
149 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
150 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 mark_buffer_dirty(bh);
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100153 if (wbc->sync_mode == WB_SYNC_ALL) {
Al Viro4427f0c2009-06-08 01:15:58 -0400154 sync_dirty_buffer(bh);
155 if (buffer_req(bh) && !buffer_uptodate(bh))
156 err = -EIO;
157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 brelse(bh);
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700159 mutex_unlock(&info->bfs_lock);
Al Viro4427f0c2009-06-08 01:15:58 -0400160 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161}
162
Al Viro9df2f852010-06-06 09:50:39 -0400163static void bfs_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 unsigned long ino = inode->i_ino;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800166 struct bfs_inode *di;
167 struct buffer_head *bh;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800168 struct super_block *s = inode->i_sb;
169 struct bfs_sb_info *info = BFS_SB(s);
170 struct bfs_inode_info *bi = BFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700172 dprintf("ino=%08lx\n", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700174 truncate_inode_pages_final(&inode->i_data);
Al Viro9df2f852010-06-06 09:50:39 -0400175 invalidate_inode_buffers(inode);
Jan Karadbd57682012-05-03 14:48:02 +0200176 clear_inode(inode);
Mark Fashehfef26652005-09-09 13:01:31 -0700177
Al Viro9df2f852010-06-06 09:50:39 -0400178 if (inode->i_nlink)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 return;
Al Viro9df2f852010-06-06 09:50:39 -0400180
181 di = find_inode(s, inode->i_ino, &bh);
182 if (IS_ERR(di))
183 return;
184
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700185 mutex_lock(&info->bfs_lock);
Al Viro9df2f852010-06-06 09:50:39 -0400186 /* clear on-disk inode */
187 memset(di, 0, sizeof(struct bfs_inode));
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800188 mark_buffer_dirty(bh);
189 brelse(bh);
190
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700191 if (bi->i_dsk_ino) {
Al Viro7e46aa52007-12-05 08:32:52 +0000192 if (bi->i_sblock)
193 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 info->si_freei++;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700195 clear_bit(ino, info->si_imap);
Fabian Frederick1da85fd2014-08-08 14:22:29 -0700196 bfs_dump_imap("delete_inode", s);
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700197 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800199 /*
200 * If this was the last file, make the previous block
201 * "last block of the last file" even if there is no
202 * real file there, saves us 1 gap.
203 */
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300204 if (info->si_lf_eblk == bi->i_eblock)
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800205 info->si_lf_eblk = bi->i_sblock - 1;
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700206 mutex_unlock(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
209static void bfs_put_super(struct super_block *s)
210{
211 struct bfs_sb_info *info = BFS_SB(s);
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700212
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800213 if (!info)
214 return;
215
Dmitri Vorobiev3f165e42008-07-25 19:44:54 -0700216 mutex_destroy(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 kfree(info->si_imap);
218 kfree(info);
219 s->s_fs_info = NULL;
220}
221
David Howells726c3342006-06-23 02:02:58 -0700222static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
David Howells726c3342006-06-23 02:02:58 -0700224 struct super_block *s = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 struct bfs_sb_info *info = BFS_SB(s);
226 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
227 buf->f_type = BFS_MAGIC;
228 buf->f_bsize = s->s_blocksize;
229 buf->f_blocks = info->si_blocks;
230 buf->f_bfree = buf->f_bavail = info->si_freeb;
231 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
232 buf->f_ffree = info->si_freei;
233 buf->f_fsid.val[0] = (u32)id;
234 buf->f_fsid.val[1] = (u32)(id >> 32);
235 buf->f_namelen = BFS_NAMELEN;
236 return 0;
237}
238
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800239static struct kmem_cache *bfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241static struct inode *bfs_alloc_inode(struct super_block *sb)
242{
243 struct bfs_inode_info *bi;
Christoph Lametere94b1762006-12-06 20:33:17 -0800244 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 if (!bi)
246 return NULL;
247 return &bi->vfs_inode;
248}
249
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100250static void bfs_i_callback(struct rcu_head *head)
251{
252 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100253 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
254}
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256static void bfs_destroy_inode(struct inode *inode)
257{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100258 call_rcu(&inode->i_rcu, bfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700261static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
263 struct bfs_inode_info *bi = foo;
264
Christoph Lametera35afb82007-05-16 22:10:57 -0700265 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
Paul Mundt20c2df82007-07-20 10:11:58 +0900267
Fabian Frederick758b4442014-04-07 15:39:02 -0700268static int __init init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269{
270 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
271 sizeof(struct bfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800272 0, (SLAB_RECLAIM_ACCOUNT|
273 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900274 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 if (bfs_inode_cachep == NULL)
276 return -ENOMEM;
277 return 0;
278}
279
280static void destroy_inodecache(void)
281{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000282 /*
283 * Make sure all delayed rcu free inodes are flushed before we
284 * destroy cache.
285 */
286 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700287 kmem_cache_destroy(bfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800290static const struct super_operations bfs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 .alloc_inode = bfs_alloc_inode,
292 .destroy_inode = bfs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 .write_inode = bfs_write_inode,
Al Viro9df2f852010-06-06 09:50:39 -0400294 .evict_inode = bfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 .put_super = bfs_put_super,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 .statfs = bfs_statfs,
297};
298
Fabian Frederick1da85fd2014-08-08 14:22:29 -0700299void bfs_dump_imap(const char *prefix, struct super_block *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700301#ifdef DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 int i;
303 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
304
305 if (!tmpbuf)
306 return;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800307 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
308 if (i > PAGE_SIZE - 100) break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 if (test_bit(i, BFS_SB(s)->si_imap))
310 strcat(tmpbuf, "1");
311 else
312 strcat(tmpbuf, "0");
313 }
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800314 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
315 prefix, BFS_SB(s)->si_lasti, tmpbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 free_page((unsigned long)tmpbuf);
317#endif
318}
319
320static int bfs_fill_super(struct super_block *s, void *data, int silent)
321{
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300322 struct buffer_head *bh, *sbh;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800323 struct bfs_super_block *bfs_sb;
324 struct inode *inode;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700325 unsigned i, imap_len;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800326 struct bfs_sb_info *info;
Al Viro59986492010-01-24 00:52:22 -0500327 int ret = -EINVAL;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800328 unsigned long i_sblock, i_eblock, i_eoff, s_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700330 info = kzalloc(sizeof(*info), GFP_KERNEL);
Jan Blunckba13d592010-02-24 13:25:29 +0100331 if (!info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return -ENOMEM;
Al Viro59986492010-01-24 00:52:22 -0500333 mutex_init(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 s->s_fs_info = info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 sb_set_blocksize(s, BFS_BSIZE);
337
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300338 sbh = sb_bread(s, 0);
339 if (!sbh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 goto out;
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300341 bfs_sb = (struct bfs_super_block *)sbh->b_data;
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700342 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 if (!silent)
344 printf("No BFS filesystem on %s (magic=%08x)\n",
Andrew Stribblehillfac92be2005-09-09 13:02:04 -0700345 s->s_id, le32_to_cpu(bfs_sb->s_magic));
Al Viro59986492010-01-24 00:52:22 -0500346 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 }
348 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
349 printf("%s is unclean, continuing\n", s->s_id);
350
351 s->s_magic = BFS_MAGIC;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800352
353 if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
354 printf("Superblock is corrupted\n");
Al Viro59986492010-01-24 00:52:22 -0500355 goto out1;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800356 }
357
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800358 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
359 sizeof(struct bfs_inode)
360 + BFS_ROOT_INO - 1;
361 imap_len = (info->si_lasti / 8) + 1;
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700362 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 if (!info->si_imap)
Al Viro59986492010-01-24 00:52:22 -0500364 goto out1;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800365 for (i = 0; i < BFS_ROOT_INO; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 set_bit(i, info->si_imap);
367
368 s->s_op = &bfs_sops;
David Howellse33ab082008-02-07 00:15:32 -0800369 inode = bfs_iget(s, BFS_ROOT_INO);
370 if (IS_ERR(inode)) {
371 ret = PTR_ERR(inode);
Al Viro59986492010-01-24 00:52:22 -0500372 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
Al Viro48fde702012-01-08 22:15:13 -0500374 s->s_root = d_make_root(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 if (!s->s_root) {
David Howellse33ab082008-02-07 00:15:32 -0800376 ret = -ENOMEM;
Al Viro59986492010-01-24 00:52:22 -0500377 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 }
379
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800380 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
381 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
382 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 info->si_freei = 0;
384 info->si_lf_eblk = 0;
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800385
386 /* can we read the last block? */
387 bh = sb_bread(s, info->si_blocks - 1);
388 if (!bh) {
389 printf("Last block not available: %lu\n", info->si_blocks - 1);
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800390 ret = -EIO;
Al Viro59986492010-01-24 00:52:22 -0500391 goto out3;
Eric Sesterhenn50682bb2009-01-06 14:43:13 -0800392 }
393 brelse(bh);
394
Al Viroc2b513d2005-10-04 17:48:44 +0100395 bh = NULL;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800396 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
Al Viroc2b513d2005-10-04 17:48:44 +0100397 struct bfs_inode *di;
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800398 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
Al Viroc2b513d2005-10-04 17:48:44 +0100399 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
Dmitri Vorobiev75b25b42008-07-25 19:44:52 -0700400 unsigned long eblock;
Al Viroc2b513d2005-10-04 17:48:44 +0100401
402 if (!off) {
403 brelse(bh);
404 bh = sb_bread(s, block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
Al Viroc2b513d2005-10-04 17:48:44 +0100406
407 if (!bh)
408 continue;
409
410 di = (struct bfs_inode *)bh->b_data + off;
411
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800412 /* test if filesystem is not corrupted */
413
414 i_eoff = le32_to_cpu(di->i_eoffset);
415 i_sblock = le32_to_cpu(di->i_sblock);
416 i_eblock = le32_to_cpu(di->i_eblock);
417 s_size = le32_to_cpu(bfs_sb->s_end);
418
419 if (i_sblock > info->si_blocks ||
420 i_eblock > info->si_blocks ||
421 i_sblock > i_eblock ||
422 i_eoff > s_size ||
423 i_sblock * BFS_BSIZE > i_eoff) {
424
425 printf("Inode 0x%08x corrupted\n", i);
426
427 brelse(bh);
Al Viro59986492010-01-24 00:52:22 -0500428 ret = -EIO;
429 goto out3;
Eric Sesterhenne1f89ec2009-01-06 14:43:12 -0800430 }
431
Al Viroc2b513d2005-10-04 17:48:44 +0100432 if (!di->i_ino) {
433 info->si_freei++;
434 continue;
435 }
436 set_bit(i, info->si_imap);
437 info->si_freeb -= BFS_FILEBLOCKS(di);
438
Al Viroc2b513d2005-10-04 17:48:44 +0100439 eblock = le32_to_cpu(di->i_eblock);
Dmitri Vorobievf433dc52007-11-14 16:59:47 -0800440 if (eblock > info->si_lf_eblk)
Al Viroc2b513d2005-10-04 17:48:44 +0100441 info->si_lf_eblk = eblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 }
Al Viroc2b513d2005-10-04 17:48:44 +0100443 brelse(bh);
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300444 brelse(sbh);
Fabian Frederick1da85fd2014-08-08 14:22:29 -0700445 bfs_dump_imap("read_super", s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return 0;
447
Al Viro59986492010-01-24 00:52:22 -0500448out3:
449 dput(s->s_root);
450 s->s_root = NULL;
451out2:
452 kfree(info->si_imap);
453out1:
Artem Bityutskiy4e29d502010-07-05 15:15:01 +0300454 brelse(sbh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455out:
Al Viro59986492010-01-24 00:52:22 -0500456 mutex_destroy(&info->bfs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 kfree(info);
458 s->s_fs_info = NULL;
David Howellse33ab082008-02-07 00:15:32 -0800459 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460}
461
Al Viro152a0832010-07-25 00:46:55 +0400462static struct dentry *bfs_mount(struct file_system_type *fs_type,
463 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
Al Viro152a0832010-07-25 00:46:55 +0400465 return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
468static struct file_system_type bfs_fs_type = {
469 .owner = THIS_MODULE,
470 .name = "bfs",
Al Viro152a0832010-07-25 00:46:55 +0400471 .mount = bfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 .kill_sb = kill_block_super,
473 .fs_flags = FS_REQUIRES_DEV,
474};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800475MODULE_ALIAS_FS("bfs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477static int __init init_bfs_fs(void)
478{
479 int err = init_inodecache();
480 if (err)
481 goto out1;
482 err = register_filesystem(&bfs_fs_type);
483 if (err)
484 goto out;
485 return 0;
486out:
487 destroy_inodecache();
488out1:
489 return err;
490}
491
492static void __exit exit_bfs_fs(void)
493{
494 unregister_filesystem(&bfs_fs_type);
495 destroy_inodecache();
496}
497
498module_init(init_bfs_fs)
499module_exit(exit_bfs_fs)