[PATCH] USB: ub 1/3: Axboe's quasi-S/G

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This the quasi-S/G patch for ub as suggested by Jens Axboe at OLS and
implemented that night before 4 a.m. Surprisingly, it worked right away...
Alas, I had to skip some OLS partying, but it was for the good cause.
Now the speed of ub is quite acceptable even on partitions with small
block size.

The ub does not really support S/G. Instead, it just tells the block
layer that it does. Then, most of the time, the block layer merges
requests and passes single-segmnent requests down to ub; everything
works as before. Very rarely ub gets an unmerged S/G request. In such
case, it issues several commands to the device.

I added a small array of counters to monitor the merging (sg_stat).
This may be dropped later.

Signed-off-by: Pete Zaitcev <zaitcev@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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This commit is contained in:

Pete Zaitcev 2005-07-30 22:38:30 -07:00 • committed by Greg Kroah-Hartman

parent 64be075858

commit ba6abf1352

1 changed files with 126 additions and 59 deletions

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drivers/block/ub.c

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