On Thu, Nov 21, 2024 at 11:44:14AM +0100, Karel Zak wrote:
> On Tue, Nov 19, 2024 at 09:49:57AM GMT, Theodore Ts'o wrote:
> > The O_DIRECT read isn't a magic bullet.
>
> Hmm... the nice thing about this patch is that it only uses O_DIRECT
> when necessary (if the ordinary method fails). This mean
On Tue, Nov 19, 2024 at 09:49:57AM -0800, Theodore Ts'o wrote:
> Yes, this can happen if the file system is mounted. The reason for
> this is that the kernel updates metadata blocks via the block buffer
> cache, with the jbd2 (journaled block layer v2) subsystem managing the
> atomic updates. T
On Mon, Nov 18, 2024 at 11:36:48PM +0100, Lennart Poettering wrote:
> On Mo, 18.11.24 12:35, Krister Johansen (k...@templeofstupid.com) wrote:
>
> > Reads of ext superblocks can race with updates. If libblkid observes a
> > checksum mismatch, re-read the superblock with O_DIRE
detected.
[1] https://lore.kernel.org/linux-ext4/20230609042239.ga1436...@mit.edu/
Signed-off-by: Krister Johansen
---
libblkid/src/blkidP.h | 5 +
libblkid/src/probe.c | 27 +++
libblkid/src/superblocks/ext.c | 22 --
3 files
