On Thu, May 06, 2021 at 05:21:10PM -0700, Harshad Shirwadkar wrote:

From: Harshad Shirwadkar <redacted>

Fast commit related struct ext4_fc_tl can be unaligned on disk. So,
while accessing that we should ensure that the pointers are
aligned. This patch fixes unaligned accesses to ext4_fc_tl and also
gets rid of macros fc_for_each_tl and ext4_fc_tag_val that may result
in unaligned accesses to struct ext4_fc_tl.

Signed-off-by: Harshad Shirwadkar <redacted>

Looks good.  I wrote my reply with a proposed version of
ext4_fc_tag_val() before I saw your patch.

This patch wasn't enough to fix the sparc64 crash, but after doing
some additional investigation, I was able to figure out how to fix
things so that j_recovery_fast_commit is working on sparc64.  Patch
follows on this thread...

					- Ted