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path: root/drivers/scsi/scsi_lib.c
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Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c123
1 files changed, 53 insertions, 70 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 604f4d71793..207f1aa0886 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -288,7 +288,7 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
{
struct request_queue *q = rq->q;
int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
- unsigned int data_len = 0, len, bytes, off;
+ unsigned int data_len = bufflen, len, bytes, off;
struct page *page;
struct bio *bio = NULL;
int i, err, nr_vecs = 0;
@@ -297,10 +297,15 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
page = sgl[i].page;
off = sgl[i].offset;
len = sgl[i].length;
- data_len += len;
- while (len > 0) {
+ while (len > 0 && data_len > 0) {
+ /*
+ * sg sends a scatterlist that is larger than
+ * the data_len it wants transferred for certain
+ * IO sizes
+ */
bytes = min_t(unsigned int, len, PAGE_SIZE - off);
+ bytes = min(bytes, data_len);
if (!bio) {
nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
@@ -332,12 +337,13 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
page++;
len -= bytes;
+ data_len -=bytes;
off = 0;
}
}
rq->buffer = rq->data = NULL;
- rq->data_len = data_len;
+ rq->data_len = bufflen;
return 0;
free_bios:
@@ -430,6 +436,7 @@ EXPORT_SYMBOL_GPL(scsi_execute_async);
static void scsi_init_cmd_errh(struct scsi_cmnd *cmd)
{
cmd->serial_number = 0;
+ cmd->resid = 0;
memset(cmd->sense_buffer, 0, sizeof cmd->sense_buffer);
if (cmd->cmd_len == 0)
cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
@@ -924,11 +931,11 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
break;
}
}
- if (!(req->cmd_flags & REQ_QUIET)) {
- scmd_printk(KERN_INFO, cmd,
- "Device not ready: ");
- scsi_print_sense_hdr("", &sshdr);
- }
+ if (!(req->cmd_flags & REQ_QUIET))
+ scsi_cmd_print_sense_hdr(cmd,
+ "Device not ready",
+ &sshdr);
+
scsi_end_request(cmd, 0, this_count, 1);
return;
case VOLUME_OVERFLOW:
@@ -962,7 +969,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
}
scsi_end_request(cmd, 0, this_count, !result);
}
-EXPORT_SYMBOL(scsi_io_completion);
/*
* Function: scsi_init_io()
@@ -1019,9 +1025,6 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
printk(KERN_ERR "req nr_sec %lu, cur_nr_sec %u\n", req->nr_sectors,
req->current_nr_sectors);
- /* release the command and kill it */
- scsi_release_buffers(cmd);
- scsi_put_command(cmd);
return BLKPREP_KILL;
}
@@ -1046,21 +1049,13 @@ static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
return cmd;
}
-static void scsi_blk_pc_done(struct scsi_cmnd *cmd)
-{
- BUG_ON(!blk_pc_request(cmd->request));
- /*
- * This will complete the whole command with uptodate=1 so
- * as far as the block layer is concerned the command completed
- * successfully. Since this is a REQ_BLOCK_PC command the
- * caller should check the request's errors value
- */
- scsi_io_completion(cmd, cmd->request_bufflen);
-}
-
-static int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
+int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
{
struct scsi_cmnd *cmd;
+ int ret = scsi_prep_state_check(sdev, req);
+
+ if (ret != BLKPREP_OK)
+ return ret;
cmd = scsi_get_cmd_from_req(sdev, req);
if (unlikely(!cmd))
@@ -1103,21 +1098,22 @@ static int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
cmd->transfersize = req->data_len;
cmd->allowed = req->retries;
cmd->timeout_per_command = req->timeout;
- cmd->done = scsi_blk_pc_done;
return BLKPREP_OK;
}
+EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd);
/*
* Setup a REQ_TYPE_FS command. These are simple read/write request
* from filesystems that still need to be translated to SCSI CDBs from
* the ULD.
*/
-static int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
+int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
{
struct scsi_cmnd *cmd;
- struct scsi_driver *drv;
- int ret;
+ int ret = scsi_prep_state_check(sdev, req);
+ if (ret != BLKPREP_OK)
+ return ret;
/*
* Filesystem requests must transfer data.
*/
@@ -1127,26 +1123,12 @@ static int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
if (unlikely(!cmd))
return BLKPREP_DEFER;
- ret = scsi_init_io(cmd);
- if (unlikely(ret))
- return ret;
-
- /*
- * Initialize the actual SCSI command for this request.
- */
- drv = *(struct scsi_driver **)req->rq_disk->private_data;
- if (unlikely(!drv->init_command(cmd))) {
- scsi_release_buffers(cmd);
- scsi_put_command(cmd);
- return BLKPREP_KILL;
- }
-
- return BLKPREP_OK;
+ return scsi_init_io(cmd);
}
+EXPORT_SYMBOL(scsi_setup_fs_cmnd);
-static int scsi_prep_fn(struct request_queue *q, struct request *req)
+int scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
{
- struct scsi_device *sdev = q->queuedata;
int ret = BLKPREP_OK;
/*
@@ -1192,35 +1174,25 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
ret = BLKPREP_KILL;
break;
}
-
- if (ret != BLKPREP_OK)
- goto out;
}
+ return ret;
+}
+EXPORT_SYMBOL(scsi_prep_state_check);
- switch (req->cmd_type) {
- case REQ_TYPE_BLOCK_PC:
- ret = scsi_setup_blk_pc_cmnd(sdev, req);
- break;
- case REQ_TYPE_FS:
- ret = scsi_setup_fs_cmnd(sdev, req);
- break;
- default:
- /*
- * All other command types are not supported.
- *
- * Note that these days the SCSI subsystem does not use
- * REQ_TYPE_SPECIAL requests anymore. These are only used
- * (directly or via blk_insert_request) by non-SCSI drivers.
- */
- blk_dump_rq_flags(req, "SCSI bad req");
- ret = BLKPREP_KILL;
- break;
- }
+int scsi_prep_return(struct request_queue *q, struct request *req, int ret)
+{
+ struct scsi_device *sdev = q->queuedata;
- out:
switch (ret) {
case BLKPREP_KILL:
req->errors = DID_NO_CONNECT << 16;
+ /* release the command and kill it */
+ if (req->special) {
+ struct scsi_cmnd *cmd = req->special;
+ scsi_release_buffers(cmd);
+ scsi_put_command(cmd);
+ req->special = NULL;
+ }
break;
case BLKPREP_DEFER:
/*
@@ -1237,6 +1209,17 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
return ret;
}
+EXPORT_SYMBOL(scsi_prep_return);
+
+static int scsi_prep_fn(struct request_queue *q, struct request *req)
+{
+ struct scsi_device *sdev = q->queuedata;
+ int ret = BLKPREP_KILL;
+
+ if (req->cmd_type == REQ_TYPE_BLOCK_PC)
+ ret = scsi_setup_blk_pc_cmnd(sdev, req);
+ return scsi_prep_return(q, req, ret);
+}
/*
* scsi_dev_queue_ready: if we can send requests to sdev, return 1 else
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-15 08:41:06 +0000