exofs: convert io_state to use pages array instead of bio at input

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* inode.c operations are full-pages based, and not actually
  true scatter-gather
* Lets us use more pages at once upto 512 (from 249) in 64 bit
* Brings us much much closer to be able to use exofs's io_state engine
  from objlayout driver. (Once I decide where to put the common code)

After RAID0 patch the outer (input) bio was never used as a bio, but
was simply a page carrier into the raid engine. Even in the simple
mirror/single-dev arrangement pages info was copied into a second bio.
It is now easer to just pass a pages array into the io_state and prepare
bio(s) once.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

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This commit is contained in:

Boaz Harrosh 2010-01-28 18:24:06 +02:00

parent 5d952b8391

commit 86093aaff5

3 changed files with 71 additions and 61 deletions

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5

fs/exofs/exofs.h

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81

fs/exofs/inode.c

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46

fs/exofs/ios.c

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