From: Alan Stern Date: Tue, 20 Feb 2007 16:01:57 +0000 (-0500) Subject: [SCSI] sg: cap reserved_size values at max_sectors X-Git-Tag: v2.6.22-rc1~1015^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44ec95425c1d9dce6e4638c29e4362cfb44814e7;p=pandora-kernel.git [SCSI] sg: cap reserved_size values at max_sectors This patch (as857) modifies the SG_GET_RESERVED_SIZE and SG_SET_RESERVED_SIZE ioctls in the sg driver, capping the values at the device's request_queue's max_sectors value. This will permit cdrecord to obtain a legal value for the maximum transfer length, fixing Bugzilla #7026. The patch also caps the initial reserved_size value. There's no reason to have a reserved buffer larger than max_sectors, since it would be impossible to use the extra space. The corresponding ioctls in the block layer are modified similarly, and the initial value for the reserved_size is set as large as possible. This will effectively make it default to max_sectors. Note that the actual value is meaningless anyway, since block devices don't have a reserved buffer. Finally, the BLKSECTGET ioctl is added to sg, so that there will be a uniform way for users to determine the actual max_sectors value for any raw SCSI transport. Signed-off-by: Alan Stern Acked-by: Jens Axboe Acked-by: Douglas Gilbert Signed-off-by: James Bottomley --- Reading git-diff-tree failed