linux/drivers/block
Alex Elder 4634246db8 rbd: consolidate rbd_do_op() calls
The two calls to rbd_do_op() from rbd_rq_fn() differ only in the
value passed for the snapshot id and the snapshot context.

For reads the snapshot always comes from the mapping, and for writes
the snapshot id is always CEPH_NOSNAP.

The snapshot context is always null for reads.  For writes, the
snapshot context always comes from the rbd header, but it is
acquired under protection of header semaphore and could change
thereafter, so we can't simply use what's available inside
rbd_do_op().

Eliminate the snapid parameter from rbd_do_op(), and set it
based on the I/O direction inside that function instead.  Always
pass the snapshot context acquired in the caller, but reset it
to a null pointer inside rbd_do_op() if the operation is a read.

As a result, there is no difference in the read and write calls
to rbd_do_op() made in rbd_rq_fn(), so just call it unconditionally.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2012-10-26 17:18:08 -05:00
..
aoe aoe: assert AoE packets marked as requiring no checksum 2012-09-20 22:23:40 -04:00
drbd Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2012-08-25 11:36:43 -07:00
mtip32xx mtip32xx: fix user_buffer check in exec_drive_command 2012-09-12 22:21:13 +02:00
paride paride/pcd: fix bool verbose module parameter. 2012-01-13 09:32:26 +10:30
xen-blkback xen/m2p: do not reuse kmap_op->dev_bus_addr 2012-09-12 11:21:40 -04:00
amiflop.c fs: move code out of buffer.c 2012-01-03 22:54:07 -05:00
ataflop.c block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers 2011-04-21 21:33:05 +02:00
brd.c block: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:16 +08:00
cciss_cmd.h cciss: use new doorbell-bit-5 reset method 2011-05-06 08:23:55 -06:00
cciss_scsi.c cciss: fix handling of protocol error 2012-09-18 11:57:08 +02:00
cciss_scsi.h cciss: add cciss_tape_cmds module paramter 2011-05-06 08:23:59 -06:00
cciss.c block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
cciss.h cciss: Adds simple mode functionality 2011-08-08 11:40:15 +02:00
cpqarray.c drivers/block/cpqarray.c: use pci_dev->revision 2011-09-21 10:02:13 +02:00
cpqarray.h
cryptoloop.c
DAC960.c dac960: Remove unused variables from DAC960_CreateProcEntries() 2012-05-11 16:42:14 +02:00
DAC960.h
floppy.c Merge branch 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/floppy into for-3.6/drivers 2012-07-31 11:47:36 +02:00
hd.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ida_cmd.h
ida_ioctl.h
Kconfig usb/ub: deprecate & schedule for removal the "Low Performance USB Block" driver 2012-03-16 13:30:10 -07:00
loop.c blk: fix wrong idr_pre_get() error check in loop.c 2012-07-14 15:39:58 -07:00
Makefile Merge git://git.infradead.org/users/willy/linux-nvme 2012-01-18 12:34:09 -08:00
mg_disk.c mg_disk: Use struct dev_pm_ops for power management 2012-07-06 19:07:00 +02:00
nbd.c nbd: clear waiting_queue on shutdown 2012-09-17 15:00:37 -07:00
nvme.c Merge git://git.infradead.org/users/willy/linux-nvme 2012-09-29 10:31:52 -07:00
osdblk.c block: remove spurious uses of REQ_HARDBARRIER 2010-09-10 12:35:36 +02:00
pktcdvd.c block: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:16 +08:00
ps3disk.c block: Fix files that are modules and hence need module.h 2011-10-31 19:31:13 -04:00
ps3vram.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
rbd_types.h rbd: define some new format constants 2012-10-01 14:30:53 -05:00
rbd.c rbd: consolidate rbd_do_op() calls 2012-10-26 17:18:08 -05:00
smart1,2.h fix typos 'comamnd' -> 'command' in comments 2011-02-02 11:31:21 +01:00
sunvdc.c powerpc+sparc/vio: Modernize driver registration 2012-03-28 11:33:24 +11:00
swim3.c block/swim3: Locking fixes 2011-12-12 12:42:12 +01:00
swim_asm.S
swim.c m68k/mac: cleanup forward declarations 2011-12-10 19:52:46 +01:00
sx8.c block, sx8: fix pointer math issue getting fw version 2012-03-03 19:44:39 +01:00
ub.c usb/ub: deprecate & schedule for removal the "Low Performance USB Block" driver 2012-03-16 13:30:10 -07:00
umem.c blk: pass from_schedule to non-request unplug functions. 2012-07-31 09:08:15 +02:00
umem.h
virtio_blk.c virtio-blk: allow toggling host cache between writeback and writethrough 2012-07-30 13:30:52 +09:30
xd.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
xd.h
xen-blkfront.c This patch series contains a major revamp of how we collect entropy 2012-07-31 19:07:42 -07:00
xsysace.c block: xsysace: Don't use NO_IRQ 2012-01-05 08:34:29 +01:00
z2ram.c drivers/block/z2ram.c: correct printing of sector_t 2010-10-28 06:15:26 -06:00