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ext4: use EXT4_BAD_INO for buddy cache to avoid colliding with valid inode #

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Signed-off-by: Yu Jian <yujian@whamcloud.com>
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Yu Jian 2011-08-01 17:41:39 -04:00 committed by Theodore Ts'o
parent 9d8b9ec442
commit 48e6061bf4
1 changed files with 5 additions and 1 deletions
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6
fs/ext4/mballoc.c
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@ -2342,7 +2342,11 @@ static int ext4_mb_init_backend(struct super_block *sb)
ext4_msg(sb, KERN_ERR, "can't get new inode");
goto err_freesgi;
}
sbi->s_buddy_cache->i_ino = get_next_ino();
/* To avoid potentially colliding with an valid on-disk inode number,
* use EXT4_BAD_INO for the buddy cache inode number. This inode is
* not in the inode hash, so it should never be found by iget(), but
* this will avoid confusion if it ever shows up during debugging. */
sbi->s_buddy_cache->i_ino = EXT4_BAD_INO;
EXT4_I(sbi->s_buddy_cache)->i_disksize = 0;
for (i = 0; i < ngroups; i++) {
desc = ext4_get_group_desc(sb, i, NULL);