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SubjectRegression in v2.6.19-git18: Unable to write CD
There is a regression in v2.6.19-rc18 that makes one unable to write CD's. In k3b, the drive status 
shows no devices. I used git bisect to find the bad commit is the following:

0e75f9063f5c55fb0b0b546a7c356f8ec186825e is first bad commit
commit 0e75f9063f5c55fb0b0b546a7c356f8ec186825e
Author: Mike Christie <michaelc@cs.wisc.edu>
Date: Fri Dec 1 10:40:55 2006 +0100

[PATCH] block: support larger block pc requests

This patch modifies blk_rq_map/unmap_user() and the cdrom and scsi_ioctl.c
users so that it supports requests larger than bio by chaining them together.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

:040000 040000 e8ca778ffe67908f24bb7bdf2e7f2e86c64c9d73 cc8c200f9e4b690b6ead717ecb8ff3687a2b5179 M
block
:040000 040000 512435f7df5397c515a27a58b944f553697c6902 f7eab7589a5950dd589d44015f02973f717da8c2 M
drivers
:040000 040000 c589bd48a88bffabbaaffb83a64aa8d484797991 717277cb369c0cb46301115285421de087825843 M
fs
:040000 040000 5083595bd2ac0c60764ac8dfe627bec09726edb8 874a14cb29cfda0c1dfe7b05638ac8304b1bd423 M
include


Larry
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