2008-12-03 19:58:05

by Greg KH

[permalink] [raw]
Subject: [patch 098/104] ext4: add checksum calculation when clearing UNINIT flag in ext4_new_inode

2.6.27-stable review patch. If anyone has any objections, please let us know.

From: Frederic Bohe <[email protected]>

(cherry picked from commit 23712a9c28b9f80a8cf70c8490358d5f562d2465)

When initializing an uninitialized block group in ext4_new_inode(),
its block group checksum must be re-calculated. This fixes a race
when several threads try to allocate a new inode in an UNINIT'd group.

There is some question whether we need to be initializing the block
bitmap in ext4_new_inode() at all, but for now, if we are going to
init the block group, let's eliminate the race.

Signed-off-by: Frederic Bohe <[email protected]>
Signed-off-by: "Theodore Ts'o" <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

fs/ext4/ialloc.c | 2 ++
1 file changed, 2 insertions(+)

--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -717,6 +717,8 @@ got:
gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
free = ext4_free_blocks_after_init(sb, group, gdp);
gdp->bg_free_blocks_count = cpu_to_le16(free);
+ gdp->bg_checksum = ext4_group_desc_csum(sbi, group,
+ gdp);
spin_unlock(sb_bgl_lock(sbi, group));