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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>		18 years ago
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acorn	…
acpi	…
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atm	[PATCH] atm/ambassador: use bitrev8	18 years ago
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block	…
bluetooth	…
cdrom	…
char	[PATCH] Char: cyclades, fix warnings	18 years ago
clocksource	…
connector	…
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crypto	…
dio	…
dma	…
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eisa	…
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ide	[PATCH] sl82c105: straighten up IDE control/status register caching	18 years ago
ieee1394	…
infiniband	[PATCH] LOG2: Implement a general integer log2 facility in the kernel	18 years ago
input	…
isdn	[PATCH] ISDN: fix warnings	18 years ago
leds	…
macintosh	…
mca	…
md	[PATCH] dm: map and endio return code clarification	18 years ago
media	[PATCH] struct path: convert v4l	18 years ago
message	…
mfd	…
misc	…
mmc	[PATCH] LOG2: Implement a general integer log2 facility in the kernel	18 years ago
mtd	…
net	[PATCH] tty: switch to ktermios	18 years ago
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oprofile	…
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pci	…
pcmcia	…
pnp	…
ps3	…
rapidio	…
rtc	…
s390	[PATCH] tty: switch to ktermios	18 years ago
sbus	[PATCH] struct path: convert sbus	18 years ago
scsi	[PATCH] struct path: convert scsi	18 years ago
serial	[PATCH] tty: switch to ktermios	18 years ago
sh	…
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spi	…
tc	[PATCH] tty: switch to ktermios	18 years ago
telephony	…
usb	[PATCH] tty: switch to ktermios	18 years ago
video	[PATCH] video: neofb stray bracket fix	18 years ago
w1	…
zorro	[PATCH] struct path: convert zorro	18 years ago
Kconfig	…
Makefile	…