s390/dasd: Add dasd_eckd_build_cp_tpm_writefulltrack()

Add the channel program builder for WRITE_FULL_TRACK requests, used
by dasd_eckd_ese_format() (next patch) to format and write a set of
tracks atomically and avoid the format cycle on ESE devices.

The program is an ITCW with a TIDAW list. Per track it emits an eckd_r0
header, an eckd_count + data pair for every record (pad records before
and after the caller's data window use device->nulldata, records in the
window point into the bio payload), and a terminating 0xFF pseudo-count
with TIDAW_FLAGS_INSERT_CBC. The descriptors come from the per-device
fill_chunks pool so they can be freed in bulk in __dasd_cleanup_cqr().

Add inline helpers crosses_page() and reserve_nocross(), to keep each
descriptor within one page since TIDAW addressing must not cross a page
boundary.

Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://patch.msgid.link/20260805111612.1285190-12-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions