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| author | NeilBrown <neilb@cse.unsw.edu.au> | 2005-09-09 16:23:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 16:39:10 -0700 |
| commit | 4b6d287f627b5fb6a49f78f9e81649ff98c62bb7 (patch) | |
| tree | 7b6cbc6a997e25a7fb6185da7129e539c4ffda8b /drivers/char/sysrq.c | |
| parent | 8ddf9efe6708f3674f0ddfeb6425fd27bea109a2 (diff) | |
| download | talos-op-linux-4b6d287f627b5fb6a49f78f9e81649ff98c62bb7.tar.gz talos-op-linux-4b6d287f627b5fb6a49f78f9e81649ff98c62bb7.zip | |
[PATCH] md: add write-behind support for md/raid1
If a device is flagged 'WriteMostly' and the array has a bitmap, and the
bitmap superblock indicates that write_behind is allowed, then write_behind is
enabled for WriteMostly devices.
Write requests will be acknowledges as complete to the caller (via b_end_io)
when all non-WriteMostly devices have completed the write, but will not be
cleared from the bitmap until all devices complete.
This requires memory allocation to make a local copy of the data being
written. If there is insufficient memory, then we fall-back on normal write
semantics.
Signed-Off-By: Paul Clements <paul.clements@steeleye.com>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/sysrq.c')
0 files changed, 0 insertions, 0 deletions
