From: Josef Bacik Date: Wed, 9 Dec 2009 02:48:58 +0000 (-0500) Subject: ext4: wait for log to commit when umounting X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=d4edac314e9ad0b21ba20ba8bc61b61f186f79e1;p=~shefty%2Frdma-dev.git ext4: wait for log to commit when umounting There is a potential race when a transaction is committing right when the file system is being umounting. This could reduce in a race because EXT4_SB(sb)->s_group_info could be freed in ext4_put_super before the commit code calls a callback so the mballoc code can release freed blocks in the transaction, resulting in a panic trying to access the freed s_group_info. The fix is to wait for the transaction to finish committing before we shutdown the multiblock allocator. Signed-off-by: Josef Bacik Signed-off-by: "Theodore Ts'o" --- diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 30476daf966..8ab0c951847 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -603,10 +603,6 @@ static void ext4_put_super(struct super_block *sb) if (sb->s_dirt) ext4_commit_super(sb, 1); - ext4_release_system_zone(sb); - ext4_mb_release(sb); - ext4_ext_release(sb); - ext4_xattr_put_super(sb); if (sbi->s_journal) { err = jbd2_journal_destroy(sbi->s_journal); sbi->s_journal = NULL; @@ -614,6 +610,12 @@ static void ext4_put_super(struct super_block *sb) ext4_abort(sb, __func__, "Couldn't clean up the journal"); } + + ext4_release_system_zone(sb); + ext4_mb_release(sb); + ext4_ext_release(sb); + ext4_xattr_put_super(sb); + if (!(sb->s_flags & MS_RDONLY)) { EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); es->s_state = cpu_to_le16(sbi->s_mount_state);