tree 3ec6d645847ea451b15abd6c9f1f27ce93591fd9
parent faa569763a7753e0a7cb8fd3919a62c0f7cc1e3c
author Mingming Cao <cmm@us.ibm.com> 1143365879 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1143392221 -0800

[PATCH] ext3_get_blocks: Adjust reservation window size for mblocks

Optimize the block reservation and the multiple block allocation: with the
knowledge of the total number of blocks ahead, set or adjust the reservation
window size properly (based on the number of blocks needed) before block
allocation happens: if there isn't any reservation yet, make sure the
reservation window equals to or greater than the number of blocks needed,
before create an reservation window; if a reservation window is already
exists, try to extends the window size to match the number of blocks to
allocate.  This could increase the possibility of completing multiple blocks
allocation in a single request, as blocks are only allocated in the range of
the inode's reservation window.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>