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authorYongqiang Yang <xiaoqiangnk@gmail.com>2012-09-23 23:16:03 -0400
committerTheodore Ts'o <tytso@mit.edu>2012-09-23 23:16:03 -0400
commitf2a09af645b762f8230e7eba7fee3b6f7e6e96e7 (patch)
tree990096ae1076171e1dba0029f087ab7373c441c6 /fs/ext4/ialloc.c
parent838cd0cf9af52e034ee81513642083bbe8e4ddb1 (diff)
ext4: check free inode count before allocating an inode
Recently, I ecountered some corrupted filesystems in which some groups' free inode counts were 65535, it seemed that free inode count was overflow. This patch teaches ext4 to check free inode count before allocaing an inode. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ialloc.c')
-rw-r--r--fs/ext4/ialloc.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 26154b81b83..fa36372f3fd 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -697,6 +697,15 @@ got_group:
if (!gdp)
goto fail;
+ /*
+ * Check free inodes count before loading bitmap.
+ */
+ if (ext4_free_inodes_count(sb, gdp) == 0) {
+ if (++group == ngroups)
+ group = 0;
+ continue;
+ }
+
brelse(inode_bitmap_bh);
inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
if (!inode_bitmap_bh)