[RFC] [PATCH 0/4]Multiple block allocation and delayed allocationfor ext3

[Mingming Cao]

Hi All, 

Here are the updated patches to support multiple block allocation and
delayed allocation for ext3 done by me, Badari and Suparna.

[PATCH 1/4] -- multiple block allocation for current ext3.
(ext3_get_blocks()).

[PATCH 2/4] -- adding delayed allocation for writeback mode

[PATCH 3/4] -- generic support for cluster pages together in
mapge_writepages() to make use of getblocks() 

[PATCH 4/4] -- support multiple block allocation for ext3 writeback mode
through writepages(). 


Have done initial testing on dbench and tiobench on a 2.6.11 version of
this patch set. Dbench 8 thread throughput result is increased by 20%
with this patch set.

dbench comparison: (ext3-dm represents ext3+thispatchset)
http://www.sudhaa.com/~ram/ols2005presentation/dbench.jpg
tiobench comparison:
http://www.sudhaa.com/~ram/ols2005presentation/tio_seq_write.jpg


Todo:
- bmap() support for delayed allocation
- page reserve flag to indicate the delayed allocation
- ordered mode support for delayed allocation
- "bh" support to enable blocksize = 1k/2k filesystems



Cheers,

Mingming


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