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[PATCH] md: merge raid5 and raid6 code

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There is a lot of commonality between raid5.c and raid6main.c.  This patches
merges both into one module called raid456.  This saves a lot of code, and
paves the way for online raid5->raid6 migrations.

There is still duplication, e.g.  between handle_stripe5 and handle_stripe6.
This will probably be cleaned up later.

Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-06-26 00:27:38 -07:00 committed by Linus Torvalds
parent 16f17b39f3
commit 16a53ecc35
5 changed files with 1003 additions and 2527 deletions
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38
drivers/md/Kconfig
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@ -104,8 +104,8 @@ config MD_RAID10
If unsure, say Y.
config MD_RAID5
tristate "RAID-4/RAID-5 mode"
config MD_RAID456
tristate "RAID-4/RAID-5/RAID-6 mode"
depends on BLK_DEV_MD
---help---
A RAID-5 set of N drives with a capacity of C MB per drive provides
@ -116,14 +116,22 @@ config MD_RAID5
while a RAID-5 set distributes the parity across the drives in one
of the available parity distribution methods.
A RAID-6 set of N drives with a capacity of C MB per drive
provides the capacity of C * (N - 2) MB, and protects
against a failure of any two drives. For a given sector
(row) number, (N - 2) drives contain data sectors, and two
drives contains two independent redundancy syndromes. Like
RAID-5, RAID-6 distributes the syndromes across the drives
in one of the available parity distribution methods.
Information about Software RAID on Linux is contained in the
Software-RAID mini-HOWTO, available from
<http://www.tldp.org/docs.html#howto>. There you will also
learn where to get the supporting user space utilities raidtools.
If you want to use such a RAID-4/RAID-5 set, say Y. To
If you want to use such a RAID-4/RAID-5/RAID-6 set, say Y. To
compile this code as a module, choose M here: the module
will be called raid5.
will be called raid456.
If unsure, say Y.
@ -154,28 +162,6 @@ config MD_RAID5_RESHAPE
There should be enough spares already present to make the new
array workable.
config MD_RAID6
tristate "RAID-6 mode"
depends on BLK_DEV_MD
---help---
A RAID-6 set of N drives with a capacity of C MB per drive
provides the capacity of C * (N - 2) MB, and protects
against a failure of any two drives. For a given sector
(row) number, (N - 2) drives contain data sectors, and two
drives contains two independent redundancy syndromes. Like
RAID-5, RAID-6 distributes the syndromes across the drives
in one of the available parity distribution methods.
RAID-6 requires mdadm-1.5.0 or later, available at:
ftp://ftp.kernel.org/pub/linux/utils/raid/mdadm/
If you want to use such a RAID-6 set, say Y. To compile
this code as a module, choose M here: the module will be
called raid6.
If unsure, say Y.
config MD_MULTIPATH
tristate "Multipath I/O support"
depends on BLK_DEV_MD

5
drivers/md/Makefile
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@ -8,7 +8,7 @@ dm-multipath-objs := dm-hw-handler.o dm-path-selector.o dm-mpath.o
dm-snapshot-objs := dm-snap.o dm-exception-store.o
dm-mirror-objs := dm-log.o dm-raid1.o
md-mod-objs := md.o bitmap.o
raid6-objs := raid6main.o raid6algos.o raid6recov.o raid6tables.o \
raid456-objs := raid5.o raid6algos.o raid6recov.o raid6tables.o \
raid6int1.o raid6int2.o raid6int4.o \
raid6int8.o raid6int16.o raid6int32.o \
raid6altivec1.o raid6altivec2.o raid6altivec4.o \
@ -25,8 +25,7 @@ obj-$(CONFIG_MD_LINEAR) += linear.o
obj-$(CONFIG_MD_RAID0) += raid0.o
obj-$(CONFIG_MD_RAID1) += raid1.o
obj-$(CONFIG_MD_RAID10) += raid10.o
obj-$(CONFIG_MD_RAID5) += raid5.o xor.o
obj-$(CONFIG_MD_RAID6) += raid6.o xor.o
obj-$(CONFIG_MD_RAID456) += raid456.o xor.o
obj-$(CONFIG_MD_MULTIPATH) += multipath.o
obj-$(CONFIG_MD_FAULTY) += faulty.o
obj-$(CONFIG_BLK_DEV_MD) += md-mod.o

1033
drivers/md/raid5.c
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File diff suppressed because it is too large Load Diff

2427
drivers/md/raid6main.c
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File diff suppressed because it is too large Load Diff

1
include/linux/raid/raid5.h
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@ -212,6 +212,7 @@ struct raid5_private_data {
mddev_t *mddev;
struct disk_info *spare;
int chunk_size, level, algorithm;
int max_degraded;
int raid_disks, working_disks, failed_disks;
int max_nr_stripes;