| From: |
| Douglas Gilbert <dgilbert-AT-interlog.com> |
| To: |
| linux-scsi-AT-vger.kernel.org, linux-block-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org |
| Subject: |
| [PATCH 0/4] scatterlist: add new capabilities |
| Date: |
| Fri, 16 Oct 2020 00:52:54 -0400 |
| Message-ID: |
| <20201016045258.16246-1-dgilbert@interlog.com> |
| Cc: |
| martin.petersen-AT-oracle.com, axboe-AT-kernel.dk, bvanassche-AT-acm.org |
| Archive-link: |
| Article |
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
