From 824d7b570b4dec49e868c251d670941b02a1e489 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Sat, 26 May 2007 14:04:03 +0900 Subject: [SCSI] scsi_lib: add scatter/gather data buffer accessors This adds a set of accessors for the scsi data buffer. This is in preparation for chaining sg lists and bidirectional requests (and possibly, the mid-layer dma mapping). Signed-off-by: FUJITA Tomonori Signed-off-by: James Bottomley --- include/scsi/scsi_cmnd.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'include/scsi/scsi_cmnd.h') diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index a2e0c103249..53e170586c2 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -135,4 +135,24 @@ extern void scsi_kunmap_atomic_sg(void *virt); extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t); extern void scsi_free_sgtable(struct scatterlist *, int); +extern int scsi_dma_map(struct scsi_cmnd *cmd); +extern void scsi_dma_unmap(struct scsi_cmnd *cmd); + +#define scsi_sg_count(cmd) ((cmd)->use_sg) +#define scsi_sglist(cmd) ((struct scatterlist *)(cmd)->request_buffer) +#define scsi_bufflen(cmd) ((cmd)->request_bufflen) + +static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid) +{ + cmd->resid = resid; +} + +static inline int scsi_get_resid(struct scsi_cmnd *cmd) +{ + return cmd->resid; +} + +#define scsi_for_each_sg(cmd, sg, nseg, __i) \ + for (__i = 0, sg = scsi_sglist(cmd); __i < (nseg); __i++, (sg)++) + #endif /* _SCSI_SCSI_CMND_H */ -- cgit v1.2.3