tree e136d58c39a83159d63ded0b8203d0f2d4678415
parent 4bb47bf299719b10280ea3132a68c0acdace3ed3
author Darrick J. Wong <djwong@kernel.org> 1695143682 -0700
committer Darrick J. Wong <djwong@kernel.org> 1696461975 -0700

xfs_db: use directio for device access

XFS and tools (mkfs, copy, repair) don't generally rely on the block
device page cache, preferring instead to use directio.  For whatever
reason, the debugger was never made to do this, but let's do that now.

This should eliminate the weird fstests failures resulting from
udev/blkid pinning a cache page while the unmounting filesystem writes
to the superblock such that xfs_db finds the stale pagecache instead of
the post-unmount superblock.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>