kernel.git/drivers/scsi/st.h, branch linux-3.2.y

[SCSI] st: fix mdata->page_order handling

2009-12-10T14:54:13Z

dio transfer always resets mdata->page_order to zero. It breaks high-order pages previously allocated for non-dio transfer. This patches adds reserved_page_order to st_buffer structure to save page order for non-dio transfer. http://bugzilla.kernel.org/show_bug.cgi?id=14563 When enlarge_buffer() allocates 524288 from 0, st uses six-order page allocation. So mdata->page_order is 6 and frp_seg is 2. After that, if st uses dio, sgl_map_user_pages() sets mdata->page_order to 0 for st_do_scsi(). After that, when we call normalize_buffer(), it frees only free frp_seg * PAGE_SIZE (2 * 4096) though we should free frp_seg * PAGE_SIZE << 6 (2 * 4096 << 6). So we see buffer_size is set to 516096 (524288 - 8192). Reported-by: Joachim Breuer Tested-by: Joachim Breuer Acked-by: Kai Makisara Signed-off-by: FUJITA Tomonori Cc: stable@kernel.org Signed-off-by: James Bottomley

[SCSI] st: remove unused frp_sg_current

2009-01-02T18:02:25Z

frp_sg_current in struct st_buffer is always zero. We don't need it. Signed-off-by: FUJITA Tomonori Acked-by: Kai Makisara Signed-off-by: James Bottomley

[SCSI] st: remove unused orig_frp_segs

2009-01-02T18:02:01Z

orig_frp_segs in struct st_buffer is always zero. We don't need it. Signed-off-by: FUJITA Tomonori Acked-by: Kai Makisara Signed-off-by: James Bottomley

[SCSI] st: remove struct scatterlist

2009-01-02T18:01:15Z

This removes the usage of struct scatterlist completely. Signed-off-by: FUJITA Tomonori Acked-by: Kai Makisara Signed-off-by: James Bottomley

[SCSI] st: kill struct st_buff_fragment

2009-01-02T18:00:53Z

This removes struct st_buff_fragment and use reserved_pages array to store fragment buffer. Signed-off-by: FUJITA Tomonori Acked-by: Kai Makisara Signed-off-by: James Bottomley

[SCSI] st: convert dio path to use st_scsi_execute

2009-01-02T17:55:36Z

This patch converts the dio path (mmap) to use st_scsi_execute. IOW, it removes scsi_execute_async in the non dio path. scsi_execute_async has gone! This also remove unused st_sleep_done. Signed-off-by: FUJITA Tomonori Acked-by: Kai Makisara Signed-off-by: James Bottomley

[SCSI] st: add st_scsi_execute helper function

2009-01-02T17:54:45Z

st_scsi_execute is a helper function to perform SCSI commands involving data transfer between user and kernel space (st_read and st_write). It's the future plan to combine this with st_scsi_kern_execute helper function. Signed-off-by: FUJITA Tomonori Acked-by: Kai Makisara Signed-off-by: James Bottomley

[SCSI] st: add struct rq_map_data support

2009-01-02T17:54:23Z

This adds struct rq_map_data and the array of pointers to store fragment buffers to struct st_buffer. This patch doesn't remove st_buf_fragment but the latter patch does. Signed-off-by: FUJITA Tomonori Acked-by: Kai Makisara Signed-off-by: James Bottomley

[SCSI] st: add option to use SILI in variable block reads

2008-04-07T17:15:39Z

Add new option MT_ST_SILI to enable setting the SILI bit in reads in variable block mode. If SILI is set, reading a block shorter than the byte count does not result in CHECK CONDITION. The length of the block is determined using the residual count from the HBA. Avoiding the REQUEST SENSE command for every block speeds up some real applications considerably. Signed-off-by: Kai Makisara Signed-off-by: James Bottomley

[SCSI] st: compile fix when DEBUG set to one

2008-02-22T23:21:37Z

Remove the now useless counting of adjacent pages from the debugging code in to make it compile when DEBUG is set non-zero. Signed-off-by: Kai Makisara Signed-off-by: James Bottomley