linux-kernel - [PATCH 0/4] scatterlist: add new capabilities

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Message-Id: <20201016045258.16246-1-dgilbert@interlog.com>
Date:   Fri, 16 Oct 2020 00:52:54 -0400
From:   Douglas Gilbert <dgilbert@...erlog.com>
To:     linux-scsi@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     martin.petersen@...cle.com, axboe@...nel.dk, bvanassche@....org
Subject: [PATCH 0/4] scatterlist: add new capabilities

Scatter-gather lists (sgl_s) are frequently used as data
carriers in the block layer. For example the SCSI and NVMe
subsystems interchange data with the block layer using
sgl_s. The sgl API is declared in <linux/scatterlist.h>

The author has extended these transient sgl use cases to
a store (i.e. ramdisk) in the scsi_debug driver. Other new
potential uses of sgl_s could be for caches. When this extra
step is taken, the need to copy between sgl_s becomes apparent.
The patchset adds sgl_copy_sgl() and a few other sgl
operations.

The existing sgl_alloc_order() function can be seen as a
replacement for vmalloc() for large, long-term allocations.
For what seems like no good reason, sgl_alloc_order()
currently restricts its total allocation to less than or
equal to 4 GiB. vmalloc() has no such restriction.

This patchset is against lk 5.9.0

Douglas Gilbert (4):
  sgl_alloc_order: remove 4 GiB limit, sgl_free() warning
  scatterlist: add sgl_copy_sgl() function
  scatterlist: add sgl_compare_sgl() function
  scatterlist: add sgl_memset()

 include/linux/scatterlist.h |  12 +++
 lib/scatterlist.c           | 204 +++++++++++++++++++++++++++++++++++-
 2 files changed, 213 insertions(+), 3 deletions(-)

-- 
2.25.1