From: Frederic Bohe <frederic.bohe@xxxxxxxx> 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 <frederic.bohe@xxxxxxxx> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx> (cherry picked from commit 23712a9c28b9f80a8cf70c8490358d5f562d2465) --- fs/ext4/ialloc.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 84e5bbf..13efb5f 100644 --- 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)); -- 1.6.0.4.8.g36f27.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
