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authorBoaz Harrosh <bharrosh@panasas.com>2007-12-13 13:50:53 +0200
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-30 13:03:41 -0600
commit6f9a35e2dafa0f855ab051c11bdbf739745ff6f5 (patch)
tree5ca273c98b61a4d329653ef30faa2c0414eccd2b /include/scsi/scsi_eh.h
parent30b0c37b27485a9cb897bfe3824f6f517b8c80d6 (diff)
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[SCSI] bidirectional command support
At the block level bidi request uses req->next_rq pointer for a second bidi_read request. At Scsi-midlayer a second scsi_data_buffer structure is used for the bidi_read part. This bidi scsi_data_buffer is put on request->next_rq->special. Struct scsi_cmnd is not changed. - Define scsi_bidi_cmnd() to return true if it is a bidi request and a second sgtable was allocated. - Define scsi_in()/scsi_out() to return the in or out scsi_data_buffer from this command This API is to isolate users from the mechanics of bidi. - Define scsi_end_bidi_request() to do what scsi_end_request() does but for a bidi request. This is necessary because bidi commands are a bit tricky here. (See comments in body) - scsi_release_buffers() will also release the bidi_read scsi_data_buffer - scsi_io_completion() on bidi commands will now call scsi_end_bidi_request() and return. - The previous work done in scsi_init_io() is now done in a new scsi_init_sgtable() (which is 99% identical to old scsi_init_io()) The new scsi_init_io() will call the above twice if needed also for the bidi_read command. Only at this point is a command bidi. - In scsi_error.c at scsi_eh_prep/restore_cmnd() make sure bidi-lld is not confused by a get-sense command that looks like bidi. This is done by puting NULL at request->next_rq, and restoring. [jejb: update to sg_table and resolve conflicts also update to blk-end-request and resolve conflicts] Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'include/scsi/scsi_eh.h')
-rw-r--r--include/scsi/scsi_eh.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index 1e08be1466ee..25071d5d9bf8 100644
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -74,6 +74,7 @@ struct scsi_eh_save {
unsigned char cmd_len;
unsigned char cmnd[MAX_COMMAND_SIZE];
struct scsi_data_buffer sdb;
+ struct request *next_rq;
/* new command support */
struct scatterlist sense_sgl;