LU-14491 ldiskfs: do not corrupt journal with bh modification

LU-14491 ldiskfs: do not corrupt journal with bh modification

Currently, ldiskfs_xattr_delete_inode() zeroes xattr inode
references in cached buffers that haven't been prepared by
get_write_access().

When using journal checksums, it is possible that these buffers
are modified after the checksum is calculated but before the
buffer has been written to journal. Journal replay will fail
with a journal checksum error message if this transaction needs
to be replayed.

Change-Id: Ia3d44f24715ad97b505e08706933e4eb608c115f
Signed-off-by: Andrew Perepechko <andrew.perepechko@hpe.com>
HPE-bug-id: LUS-9483
Reviewed-on: https://review.whamcloud.com/41896
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>