From: sashiko-bot@kernel.org
To: "Stefan Haberland" <sth@linux.ibm.com>
Cc: "Alexander Gordeev" <agordeev@linux.ibm.com>,
"Heiko Carstens" <hca@linux.ibm.com>,
linux-s390@vger.kernel.org, "Vasily Gorbik" <gor@linux.ibm.com>
Subject: Re: [PATCH v3 04/13] s390/dasd: Extend prepare_itcw() to support WRITE_FULL_TRACK
Date: Thu, 23 Jul 2026 14:25:07 +0000 [thread overview]
Message-ID: <20260723142509.EE22F1F000E9@smtp.kernel.org> (raw)
In-Reply-To: <20260723134743.672413-5-sth@linux.ibm.com>
> 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.
>
> Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260723134743.672413-1-sth@linux.ibm.com?part=4
next prev parent reply other threads:[~2026-07-23 14:25 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-23 13:47 [PATCH v3 00/13] s390/dasd: ESE thin-provisioning performance improvements Stefan Haberland
2026-07-23 13:47 ` [PATCH v3 01/13] s390/dasd: Optimize max blocks per request for track alignment Stefan Haberland
2026-07-23 13:58 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 02/13] s390/dasd: Add infrastructure for ESE full-track write Stefan Haberland
2026-07-23 14:11 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 03/13] s390/dasd: Add range-based format-track collision detection Stefan Haberland
2026-07-23 14:13 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 04/13] s390/dasd: Extend prepare_itcw() to support WRITE_FULL_TRACK Stefan Haberland
2026-07-23 14:25 ` sashiko-bot [this message]
2026-07-23 13:47 ` [PATCH v3 05/13] s390/dasd: Add dasd_eckd_build_cp_tpm_writefulltrack() Stefan Haberland
2026-07-23 14:14 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 06/13] s390/dasd: Use WRITE_FULL_TRACK in ESE format handler Stefan Haberland
2026-07-23 14:13 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 07/13] s390/dasd: Add full_track_bias sysfs attribute to control fulltrack write mode Stefan Haberland
2026-07-23 14:16 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 08/13] s390/dasd: Derive adaptive ESE fulltrack heuristic from ft_bias Stefan Haberland
2026-07-23 14:09 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 09/13] s390/dasd: Stamp a format label into newly formatted volumes Stefan Haberland
2026-07-23 14:09 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 10/13] s390/dasd: Detect ESE volumes from the on-disk format label Stefan Haberland
2026-07-23 14:19 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 11/13] s390/dasd: Report ESE capability and format mode at device online Stefan Haberland
2026-07-23 14:14 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 12/13] s390/dasd: Re-enable discard support for ESE volumes Stefan Haberland
2026-07-23 14:30 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 13/13] s390/dasd: Read cached unit address and LSS in the CCW build path Stefan Haberland
2026-07-23 14:35 ` sashiko-bot
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