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authorMike Miller <mike.miller@hp.com>2005-09-13 01:25:22 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-13 08:22:30 -0700
commit33079b21978f478865068ee6a3c5807b6c6ecdbe (patch)
tree086035c299e4dcc0ab6af6623c53ac72be81b303 /drivers/block/cciss_cmd.h
parentddd474420a0b0dfeda38b6b5f83c7af751235cc3 (diff)
downloadop-kernel-dev-33079b21978f478865068ee6a3c5807b6c6ecdbe.zip
op-kernel-dev-33079b21978f478865068ee6a3c5807b6c6ecdbe.tar.gz
[PATCH] cciss: direct lookup for command completions
This patch changes the way we complete commands. In the old method when we got a completion we searched our command list from the top until we find it. This method uses a tag associated with each command (not SCSI command tagging) to index us directly to the completed command. This helps performance. Signed-off-by: Don Brace <dab@hp.com> Signed-off-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/block/cciss_cmd.h')
-rw-r--r--drivers/block/cciss_cmd.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/block/cciss_cmd.h b/drivers/block/cciss_cmd.h
index a88a888..53fea54 100644
--- a/drivers/block/cciss_cmd.h
+++ b/drivers/block/cciss_cmd.h
@@ -226,6 +226,10 @@ typedef struct _ErrorInfo_struct {
#define CMD_MSG_DONE 0x04
#define CMD_MSG_TIMEOUT 0x05
+/* This structure needs to be divisible by 8 for new
+ * indexing method.
+ */
+#define PADSIZE (sizeof(long) - 4)
typedef struct _CommandList_struct {
CommandListHeader_struct Header;
RequestBlock_struct Request;
@@ -236,14 +240,14 @@ typedef struct _CommandList_struct {
ErrorInfo_struct * err_info; /* pointer to the allocated mem */
int ctlr;
int cmd_type;
+ long cmdindex;
struct _CommandList_struct *prev;
struct _CommandList_struct *next;
struct request * rq;
struct completion *waiting;
int retry_count;
-#ifdef CONFIG_CISS_SCSI_TAPE
void * scsi_cmd;
-#endif
+ char pad[PADSIZE];
} CommandList_struct;
//Configuration Table Structure
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