On Thu, Jul 28, 2022 at 03:39:14PM +0200, Lukas Czerner wrote: > Currently the I_DIRTY_TIME will never get set if the inode already has > I_DIRTY_INODE with assumption that it supersedes I_DIRTY_TIME. That's > true, however ext4 will only update the on-disk inode in > ->dirty_inode(), not on actual writeback. As a result if the inode > already has I_DIRTY_INODE state by the time we get to > __mark_inode_dirty() only with I_DIRTY_TIME, the time was already filled > into on-disk inode and will not get updated until the next I_DIRTY_INODE > update, which might never come if we crash or get a power failure. > > The problem can be reproduced on ext4 by running xfstest generic/622 > with -o iversion mount option. Fix it by setting I_DIRTY_TIME even if > the inode already has I_DIRTY_INODE. > > Also clear the I_DIRTY_TIME after ->dirty_inode() otherwise it may never > get cleared. > > Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx> If you're going to change the meaning of I_* flags, please update the comment in include/linux/fs.h that describes what they mean. - Eric
