08 Apr, 2008
1 commit
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This patch adds new three helper functions to copy data between an SG
list and a linear buffer.- sg_copy_from_buffer copies data from linear buffer to an SG list
- sg_copy_to_buffer copies data from an SG list to a linear buffer
When the APIs copy data from a linear buffer to an SG list,
flush_kernel_dcache_page is called. It's not necessary for everyone
but it's a no-op on most architectures and in general the API is not
used in performance critical path.Signed-off-by: FUJITA Tomonori
Acked-by: Jens Axboe
Signed-off-by: James Bottomley
28 Jan, 2008
2 commits
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SCSI sg table allocation has a maximum size (of SCSI_MAX_SG_SEGMENTS,
currently 128) and this will cause a BUG_ON() in SCSI if something
tries an allocation over it. This patch adds a size limit to the
chaining allocator to allow the specification of the maximum
allocation size for chaining, so we always chain in units of the
maximum SCSI allocation size.Signed-off-by: James Bottomley
Signed-off-by: Jens Axboe -
Manually doing chained sg lists is not trivial, so add some helpers
to make sure that drivers get it right.Signed-off-by: Jens Axboe
