diff options
| author | Stefan Haberland <sth@linux.ibm.com> | 2026-08-05 13:16:03 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-08-05 06:31:08 -0600 |
| commit | 44f9bf47987ec25a90d46d171b8df847d773f033 (patch) | |
| tree | 7795dd6a6914e0127ba10f99f9621d82d7ad39d1 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 05697849292011dc828b3651c159cfe694d1b5ef (diff) | |
s390/dasd: Extend prepare_itcw() to support WRITE_FULL_TRACK
prepare_itcw() builds the FCX prefix block (PFX + LRE) for track-mode
I/O. Extend it to handle DASD_ECKD_CCW_WRITE_FULL_TRACK.
WRITE_FULL_TRACK needs two extra bytes appended to the LRE for that
bitmask. The prefix block is a scratch buffer copied into the TCCB by
itcw_add_dcw(), so keep it on the stack (sized for the two extra bytes)
rather than allocating it: this runs in the writeback path and must not
depend on an allocation that can fail under memory pressure.
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://patch.msgid.link/20260805111612.1285190-11-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions