From 6e1ad219f708c0d92061ca7cc483b200f9a2e892 Mon Sep 17 00:00:00 2001 From: Frederic Bohe Date: Sun, 16 Nov 2008 11:05:40 -0500 Subject: [PATCH] ext4: add checksum calculation when clearing UNINIT flag in ext4_new_inode (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 Signed-off-by: "Theodore Ts'o" Signed-off-by: Greg Kroah-Hartman --- fs/ext4/ialloc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index f344834bbf58..98059248430f 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -715,6 +715,8 @@ 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)); -- 2.39.5