linux/drivers/block
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
..
aoe aoe: ignore vendor extension AoE responses 2009-02-18 15:37:53 -08:00
paride paride/pg.c: xs(): &&/|| confusion 2009-02-18 10:32:01 +01:00
amiflop.c m68k: amiflop - Get rid of sleep_on calls 2009-01-12 20:56:33 +01:00
ataflop.c m68k: atari - Rename "mfp" to "st_mfp" 2009-02-22 09:23:02 -08:00
brd.c [PATCH] switch brd 2008-10-21 07:47:44 -04:00
cciss.c cciss: shorten 30s timeout on controller reset 2009-02-26 10:45:48 +01:00
cciss.h cciss: switch to using hlist for command list management 2008-12-29 08:28:43 +01:00
cciss_cmd.h cciss: switch to using hlist for command list management 2008-12-29 08:28:43 +01:00
cciss_scsi.c cciss: Fix cciss SCSI rescan code to better notice device changes 2008-10-09 08:56:18 +02:00
cciss_scsi.h cciss: Fix cciss SCSI rescan code to better notice device changes 2008-10-09 08:56:18 +02:00
cpqarray.c cpqarry: fix return value of cpqarray_init() 2008-11-06 15:41:17 -08:00
cpqarray.h
cryptoloop.c drivers: Remove unnecessary inclusions of asm/semaphore.h 2008-04-18 22:16:32 -04:00
DAC960.c [PATCH] switch DAC960 2008-10-21 07:47:36 -04:00
DAC960.h Fix DAC960 driver on machines which don't support 64-bit DMA 2007-09-11 17:21:19 -07:00
floppy.c floppy: request and release only the ports we actually use 2009-02-18 15:37:55 -08:00
hd.c hd: WIN_* -> ATA_CMD_* 2008-10-10 22:39:21 +02:00
ida_cmd.h
ida_ioctl.h
Kconfig Create/use more directory structure in the Documentation/ tree. 2008-11-14 17:28:53 +00:00
loop.c loop: Do not call loop_unplug for not configured loop device. 2008-12-29 08:29:52 +01:00
Makefile move ide/legacy/hd.c to drivers/block/ 2008-07-16 20:33:47 +02:00
nbd.c nbd: fix I/O hang on disconnected nbds 2009-02-11 14:25:37 -08:00
pktcdvd.c pktcdvd: remove broken dev_t export of class devices 2008-12-10 10:03:32 -08:00
ps3disk.c powerpc/ps3: Printing fixups for l64 to ll64 conversion drivers/block 2009-01-16 16:15:13 +11:00
smart1,2.h
sunvdc.c sparc64: Fix unsigned long long warnings in drivers. 2009-01-06 13:20:38 -08:00
swim3.c [PATCH] switch swim3 2008-10-21 07:48:03 -04:00
sx8.c block: replace remaining __FUNCTION__ occurrences 2008-04-21 09:51:04 +02:00
ub.c USB: change interface to usb_lock_device_for_reset() 2009-01-07 09:59:52 -08:00
umem.c Cleanup umem driver: fix most checkpatch warnings, conform to kernel 2007-12-18 08:29:28 +01:00
umem.h drivers/block/umem: trim trailing whitespace 2007-10-10 09:25:59 +02:00
viodasd.c [PATCH] switch viodasd 2008-10-21 07:48:07 -04:00
virtio_blk.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2008-12-30 17:37:25 -08:00
xd.c [PATCH] switch xd 2008-10-21 07:48:11 -04:00
xd.h [PATCH] switch xd 2008-10-21 07:48:11 -04:00
xen-blkfront.c xen/blkfront: use blk_rq_map_sg to generate ring entries 2009-02-26 10:45:48 +01:00
xsysace.c powerpc/xsysace: add compatible string for non-ipcore instance 2009-01-09 15:49:06 -07:00
z2ram.c [PATCH] switch z2ram 2008-10-21 07:48:17 -04:00