- If we export scsi_init_io()/scsi_release_buffers() instead of
scsi_{alloc,free}_sgtable() from scsi_lib than tgt code is
much more insulated from scsi_lib changes. As a bonus it will
also gain bidi capability when it comes.
Signed-off-by: Boaz Harrosh [EMAIL PROTECTED]
Acked-by: FUJITA Tomonori [EMAIL PROTECTED]
---
drivers/scsi/scsi_lib.c | 21 ++---
drivers/scsi/scsi_tgt_lib.c | 29 +
include/scsi/scsi_cmnd.h|4 ++--
3 files changed, 17 insertions(+), 37 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index e273e4b..d1a4671 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -739,7 +739,8 @@ static inline unsigned int scsi_sgtable_index(unsigned
short nents)
return index;
}
-struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
+static struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd,
+ gfp_t gfp_mask)
{
struct scsi_host_sg_pool *sgp;
struct scatterlist *sgl, *prev, *ret;
@@ -825,9 +826,7 @@ enomem:
return NULL;
}
-EXPORT_SYMBOL(scsi_alloc_sgtable);
-
-void scsi_free_sgtable(struct scsi_cmnd *cmd)
+static void scsi_free_sgtable(struct scsi_cmnd *cmd)
{
struct scatterlist *sgl = cmd-request_buffer;
struct scsi_host_sg_pool *sgp;
@@ -873,8 +872,6 @@ void scsi_free_sgtable(struct scsi_cmnd *cmd)
mempool_free(sgl, sgp-pool);
}
-EXPORT_SYMBOL(scsi_free_sgtable);
-
/*
* Function:scsi_release_buffers()
*
@@ -892,7 +889,7 @@ EXPORT_SYMBOL(scsi_free_sgtable);
* the scatter-gather table, and potentially any bounce
* buffers.
*/
-static void scsi_release_buffers(struct scsi_cmnd *cmd)
+void scsi_release_buffers(struct scsi_cmnd *cmd)
{
if (cmd-use_sg)
scsi_free_sgtable(cmd);
@@ -904,6 +901,7 @@ static void scsi_release_buffers(struct scsi_cmnd *cmd)
cmd-request_buffer = NULL;
cmd-request_bufflen = 0;
}
+EXPORT_SYMBOL(scsi_release_buffers);
/*
* Function:scsi_io_completion()
@@ -1105,7 +1103,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned
int good_bytes)
* Returns: 0 on success
* BLKPREP_DEFER if the failure is retryable
*/
-static int scsi_init_io(struct scsi_cmnd *cmd)
+int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
{
struct request *req = cmd-request;
intcount;
@@ -1120,7 +1118,7 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
/*
* If sg table allocation fails, requeue request later.
*/
- cmd-request_buffer = scsi_alloc_sgtable(cmd, GFP_ATOMIC);
+ cmd-request_buffer = scsi_alloc_sgtable(cmd, gfp_mask);
if (unlikely(!cmd-request_buffer)) {
scsi_unprep_request(req);
return BLKPREP_DEFER;
@@ -1141,6 +1139,7 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
cmd-use_sg = count;
return BLKPREP_OK;
}
+EXPORT_SYMBOL(scsi_init_io);
static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
struct request *req)
@@ -1186,7 +1185,7 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev,
struct request *req)
BUG_ON(!req-nr_phys_segments);
- ret = scsi_init_io(cmd);
+ ret = scsi_init_io(cmd, GFP_ATOMIC);
if (unlikely(ret))
return ret;
} else {
@@ -1237,7 +1236,7 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct
request *req)
if (unlikely(!cmd))
return BLKPREP_DEFER;
- return scsi_init_io(cmd);
+ return scsi_init_io(cmd, GFP_ATOMIC);
}
EXPORT_SYMBOL(scsi_setup_fs_cmnd);
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index 93ece8f..91630ba 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -331,8 +331,7 @@ static void scsi_tgt_cmd_done(struct scsi_cmnd *cmd)
scsi_tgt_uspace_send_status(cmd, tcmd-itn_id, tcmd-tag);
- if (scsi_sglist(cmd))
- scsi_free_sgtable(cmd);
+ scsi_release_buffers(cmd);
queue_work(scsi_tgtd, tcmd-work);
}
@@ -353,26 +352,6 @@ static int scsi_tgt_transfer_response(struct scsi_cmnd
*cmd)
return 0;
}
-static int scsi_tgt_init_cmd(struct scsi_cmnd *cmd, gfp_t gfp_mask)
-{
- struct request *rq = cmd-request;
- int count;
-
- cmd-use_sg = rq-nr_phys_segments;
- cmd-request_buffer = scsi_alloc_sgtable(cmd, gfp_mask);
- if (!cmd-request_buffer)
- return -ENOMEM;
-
- cmd-request_bufflen = rq-data_len;
-
- dprintk(cmd %p cnt %d %lu\n, cmd, scsi_sg_count(cmd),
- rq_data_dir(rq));
- count = blk_rq_map_sg(rq-q, rq, scsi_sglist(cmd));
- BUG_ON(count cmd-use_sg);
- cmd-use_sg = count;
-
