kernel_optimize_test/include
Kiyoshi Ueda 45cbcd7983 [PATCH] dm: map and endio return code clarification
Tighten the use of return values from the target map and end_io functions.
Values of 2 and above are now explictly reserved for future use.  There are no
existing targets using such values.

The patch has no effect on existing behaviour.

o Reserve return values of 2 and above from target map functions.
  Any positive value currently indicates "mapping complete", but all
  existing drivers use the value 1.  We now make that a requirement
  so we can assign new meaning to higher values in future.

  The new definition of return values from target map functions is:
      < 0 : error
      = 0 : The target will handle the io (DM_MAPIO_SUBMITTED).
      = 1 : Mapping completed (DM_MAPIO_REMAPPED).
      > 1 : Reserved (undefined).  Previously this was the same as '= 1'.

o Reserve return values of 2 and above from target end_io functions
  for similar reasons.
  DM_ENDIO_INCOMPLETE is introduced for a return value of 1.

Test results:

  I have tested by using the multipath target.

  I/Os succeed when valid paths exist.

  I/Os are queued in the multipath target when there are no valid paths and
queue_if_no_path is set.

  I/Os fail when there are no valid paths and queue_if_no_path is not set.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: dm-devel@redhat.com
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 08:29:09 -08:00
..
acpi [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
asm-alpha [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-arm [PATCH] s3c2410fb: Add support for STN displays 2006-12-08 08:29:05 -08:00
asm-arm26 [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-avr32 [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-cris [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-frv [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-generic [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
asm-h8300 [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-i386 [PATCH] ide: more conversion to pci_get APIs 2006-12-08 08:29:03 -08:00
asm-ia64 [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-m32r [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-m68k [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-m68knommu [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
asm-mips [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-parisc [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-powerpc [PATCH] tty: switch to ktermios 2006-12-08 08:28:57 -08:00
asm-ppc [PATCH] mm: pagefault_{disable,enable}() 2006-12-07 08:39:21 -08:00
asm-s390 [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-sh [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-sh64 [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
asm-sparc [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-sparc64 [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-um [PATCH] UML: add generic BUG support 2006-12-08 08:28:39 -08:00
asm-v850 [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
asm-x86_64 [PATCH] termios: Enable new style termios ioctls on x86-64 2006-12-08 08:28:57 -08:00
asm-xtensa [PATCH] Pass struct dev pointer to dma_cache_sync() 2006-12-07 08:39:41 -08:00
crypto [CRYPTO] lib: table driven multiplications in GF(2^128) 2006-12-06 18:38:55 -08:00
keys
linux [PATCH] dm: map and endio return code clarification 2006-12-08 08:29:09 -08:00
math-emu
media V4L/DVB (4666): Ensure the WM8775 driver is loaded generically for any board. 2006-10-03 15:13:48 -03:00
mtd
net [PATCH] tty: switch to ktermios and new framework 2006-12-08 08:28:56 -08:00
pcmcia [PATCH] pcmcia: multifunction card handling fixes 2006-12-04 20:09:15 -05:00
rdma IB/cm: Fix automatic path migration support 2006-11-29 15:33:10 -08:00
rxrpc
scsi [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
sound Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2006-12-05 17:01:28 +00:00
video [PATCH] video: pm3fb macros fix 2006-12-08 08:29:08 -08:00
Kbuild