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Christoph Hellwig 10bc310c27 virtio_blk: support barriers without FLUSH feature 
If we want to support barriers with the cache=writethrough mode in qemu
we need to tell the block layer that we only need queue drains to
implement a barrier.  Follow the model set by SCSI and IDE and assume
that there is no volatile write cache if the host doesn't advertize it.
While this might imply working barriers on old qemu versions or other
hypervisors that actually have a volatile write cache this is only a
cosmetic issue - these hypervisors don't guarantee any data integrity
with or without this patch, but with the patch we at least provide
data ordering.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 		2010-08-05 13:05:29 +09:30
..
aoe include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
drbd Merge branch 'master' into for-next 2010-08-04 15:14:38 +02:00
paride Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2010-04-09 11:50:29 -07:00
DAC960.c block: Finalize conversion of block limits functions 2010-03-15 12:47:59 +01:00
DAC960.h Fix DAC960 driver on machines which don't support 64-bit DMA 2007-09-11 17:21:19 -07:00
Kconfig paride: fix menu indentation 2010-05-11 09:02:55 +02:00
Makefile The DRBD driver 2009-10-01 21:17:49 +02:00
amiflop.c m68k: amiga - Floppy platform device conversion 2010-05-17 21:37:45 +02:00
ataflop.c ataflop: Killl warning about unused variable flags 2010-02-27 18:27:15 +01:00
brd.c brd: support discard 2010-06-01 11:09:20 +02:00
cciss.c block: cciss: use ARRAY_SIZE 2010-07-20 17:02:03 +02:00
cciss.h cciss: do not use void pointer for scsi hba data 2010-02-28 19:42:32 +01:00
cciss_cmd.h cciss: detect bad alignment of scsi commands at build time 2010-02-28 19:42:31 +01:00
cciss_scsi.c cciss: set SCSI max cmd len to 16, as default is wrong 2010-06-15 08:12:34 +02:00
cciss_scsi.h cciss: remove C99-style comments 2010-02-22 13:44:45 +01:00
cpqarray.c cpqarray: fix two more wrong section type 2010-06-14 15:21:33 +02:00
cpqarray.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cryptoloop.c drivers: Remove unnecessary inclusions of asm/semaphore.h 2008-04-18 22:16:32 -04:00
floppy.c drivers/block/floppy.c: remove unnecessary casting in fd_ioctl 2010-03-12 15:52:31 -08:00
hd.c Merge commit 'v2.6.34-rc6' into core/locking 2010-05-03 09:17:01 +02:00
ida_cmd.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ida_ioctl.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
loop.c sanitize vfs_fsync calling conventions 2010-05-21 18:31:21 -04:00
mg_disk.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
nbd.c update email address 2010-07-19 10:56:54 +02:00
osdblk.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pktcdvd.c pktcdvd: improve BKL and compat_ioctl.c usage 2010-04-29 08:44:37 -07:00
ps3disk.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ps3vram.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
smart1,2.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sunvdc.c block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
swim.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
swim3.c powerpc/macio: Fix probing of macio devices by using the right of match table 2010-06-02 17:50:38 +10:00
swim_asm.S m68k: mac - Add SWIM floppy support 2009-03-26 21:15:27 +01:00
sx8.c block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
ub.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
umem.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
umem.h drivers/block/umem: trim trailing whitespace 2007-10-10 09:25:59 +02:00
viodasd.c Merge branch 'for-2.6.34' of git://git.kernel.dk/linux-2.6-block 2010-03-01 09:00:29 -08:00
virtio_blk.c virtio_blk: support barriers without FLUSH feature 2010-08-05 13:05:29 +09:30
xd.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
xd.h [PATCH] switch xd 2008-10-21 07:48:11 -04:00
xen-blkfront.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
xsysace.c of: Remove duplicate fields from of_platform_driver 2010-05-22 00:10:40 -06:00
z2ram.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00