linux/include
Tejun Heo 137d3edb48 sg: reimplement sg mapping iterator
This is alternative implementation of sg content iterator introduced
by commit 83e7d317... from Pierre Ossman in next-20080716.  As there's
already an sg iterator which iterates over sg entries themselves, name
this sg_mapping_iterator.

Slightly edited description from the original implementation follows.

Iteration over a sg list is not that trivial when you take into
account that memory pages might have to be mapped before being used.
Unfortunately, that means that some parts of the kernel restrict
themselves to directly accesible memory just to not have to deal with
the mess.

This patch adds a simple iterator system that allows any code to
easily traverse an sg list and not have to deal with all the details.
The user can decide to consume part of the iteration.  Also, iteration
can be stopped and resumed later if releasing the kmap between
iteration steps is necessary.  These features are useful to implement
piecemeal sg copying for interrupt drive PIO for example.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-07-23 14:42:09 +02:00
..
acpi Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2008-07-16 17:25:46 -07:00
asm-alpha
asm-arm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc 2008-07-16 15:17:52 -07:00
asm-avr32 termios: Termios defines for other platforms 2008-07-20 17:12:38 -07:00
asm-blackfin
asm-cris [CRIS] Correct definition of subdirs for install_headers. 2008-06-30 22:51:16 +02:00
asm-frv termios: Termios defines for other platforms 2008-07-20 17:12:38 -07:00
asm-generic Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2008-07-16 17:25:46 -07:00
asm-h8300
asm-ia64 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2008-07-21 14:55:23 -07:00
asm-m32r
asm-m68k m68k: remove stale ARCH_SUN4 #define 2008-07-20 17:24:39 -07:00
asm-m68knommu
asm-mips [MIPS] Remove unused maltasmp.h. 2008-07-20 14:38:22 +01:00
asm-mn10300
asm-parisc
asm-powerpc Merge commit 'origin/master' 2008-07-22 17:12:37 +10:00
asm-s390 KVM: s390: rename private structures 2008-07-20 12:42:37 +03:00
asm-sh
asm-sparc sparc: Fixes the DRM layer build on sparc. 2008-07-22 14:30:55 -07:00
asm-sparc64 sparc: join the remaining header files 2008-07-17 21:55:51 -07:00
asm-um
asm-v850
asm-x86 x86: add PTE_FLAGS_MASK 2008-07-22 10:43:45 +02:00
asm-xtensa
crypto crypto: hash - Move ahash functions into crypto/hash.h 2008-07-10 20:35:18 +08:00
drm drm/radeon: fixup issue with radeon and PAT support. 2008-07-15 15:48:05 +10:00
keys
linux sg: reimplement sg mapping iterator 2008-07-23 14:42:09 +02:00
math-emu
media V4L/DVB (8395): saa7134: Fix Kbuild dependency of ir-kbd-i2c 2008-07-20 07:29:03 -03:00
mtd
net ipv6: icmp6_dst_gc return change 2008-07-22 14:35:50 -07:00
pcmcia
rdma RDMA/addr: Keep pointer to netdevice in struct rdma_dev_addr 2008-07-14 23:48:53 -07:00
rxrpc
scsi driver core: remove KOBJ_NAME_LEN define 2008-07-21 21:54:52 -07:00
sound ALSA: Release v1.0.17 2008-07-14 09:54:43 +02:00
video
xen xen: implement Xen-specific spinlocks 2008-07-16 11:15:53 +02:00
Kbuild drm: reorganise drm tree to be more future proof. 2008-07-14 10:45:01 +10:00