Jens Axboe 9e973e64ac xen/blkfront: use blk_rq_map_sg to generate ring entries ... On occasion, the request will apparently have more segments than we fit into the ring. Jens says: > The second problem is that the block layer then appears to create one > too many segments, but from the dump it has rq->nr_phys_segments == > BLKIF_MAX_SEGMENTS_PER_REQUEST. I suspect the latter is due to > xen-blkfront not handling the merging on its own. It should check that > the new page doesn't form part of the previous page. The > rq_for_each_segment() iterates all single bits in the request, not dma > segments. The "easiest" way to do this is to call blk_rq_map_sg() and > then iterate the mapped sg list. That will give you what you are > looking for. > Here's a test patch, compiles but otherwise untested. I spent more > time figuring out how to enable XEN than to code it up, so YMMV! > Probably the sg list wants to be put inside the ring and only > initialized on allocation, then you can get rid of the sg on stack and > sg_init_table() loop call in the function. I'll leave that, and the > testing, to you. [Moved sg array into info structure, and initialize once. -J] Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>		2009-02-26 10:45:48 +01:00
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aoe
paride
amiflop.c
ataflop.c
brd.c
cciss_cmd.h
cciss_scsi.c
cciss_scsi.h
cciss.c
cciss.h
cpqarray.c
cpqarray.h
cryptoloop.c
DAC960.c
DAC960.h
floppy.c
hd.c
ida_cmd.h
ida_ioctl.h
Kconfig
loop.c
Makefile
nbd.c
pktcdvd.c
ps3disk.c
smart1,2.h
sunvdc.c
swim3.c
sx8.c
ub.c
umem.c
umem.h
viodasd.c
virtio_blk.c
xd.c
xd.h
xen-blkfront.c	xen/blkfront: use blk_rq_map_sg to generate ring entries	2009-02-26 10:45:48 +01:00
xsysace.c
z2ram.c