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| author | David Woodhouse <David.Woodhouse@intel.com> | 2013-01-29 18:40:14 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2013-02-01 14:24:23 -0500 |
| commit | 53b381b3abeb86f12787a6c40fee9b2f71edc23b (patch) | |
| tree | c1018ba2157778f0200d2ede0c0df48fe5df8f14 /fs/btrfs/Kconfig | |
| parent | 64a167011bcabc1e855658387c8a4464b71f3138 (diff) | |
| download | linux-53b381b3abeb86f12787a6c40fee9b2f71edc23b.tar.gz linux-53b381b3abeb86f12787a6c40fee9b2f71edc23b.tar.bz2 linux-53b381b3abeb86f12787a6c40fee9b2f71edc23b.zip | |
Btrfs: RAID5 and RAID6
This builds on David Woodhouse's original Btrfs raid5/6 implementation.
The code has changed quite a bit, blame Chris Mason for any bugs.
Read/modify/write is done after the higher levels of the filesystem have
prepared a given bio. This means the higher layers are not responsible
for building full stripes, and they don't need to query for the topology
of the extents that may get allocated during delayed allocation runs.
It also means different files can easily share the same stripe.
But, it does expose us to incorrect parity if we crash or lose power
while doing a read/modify/write cycle. This will be addressed in a
later commit.
Scrub is unable to repair crc errors on raid5/6 chunks.
Discard does not work on raid5/6 (yet)
The stripe size is fixed at 64KiB per disk. This will be tunable
in a later commit.
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/Kconfig')
| -rw-r--r-- | fs/btrfs/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig index d33f01c08b60..4f5dc93fa2f8 100644 --- a/fs/btrfs/Kconfig +++ b/fs/btrfs/Kconfig @@ -6,6 +6,8 @@ config BTRFS_FS select ZLIB_DEFLATE select LZO_COMPRESS select LZO_DECOMPRESS + select RAID6_PQ + help Btrfs is a new filesystem with extents, writable snapshotting, support for multiple devices and many more features. |