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authorBart Van Assche <bart.vanassche@wdc.com>2017-08-30 16:58:39 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2017-08-31 23:06:12 -0400
commit64104f703212ff50e855bb2e2fa80d71db62c521 (patch)
tree13179e6dcb14cdde2fb7b2763bfcf6537dfac8c3 /drivers/scsi/scsi_lib.c
parent3515832cc61467bfb87191a30401de1700e9956a (diff)
scsi: Call scsi_initialize_rq() for filesystem requests
If a pass-through request is submitted then blk_get_request() initializes that request by calling scsi_initialize_rq(). Also call this function for filesystem requests. Introduce CMD_INITIALIZED to keep track of whether or not a request has already been initialized. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Brian King <brking@linux.vnet.ibm.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 938a7e398cd4..4bfe0df35823 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -642,6 +642,11 @@ static bool scsi_end_request(struct request *req, blk_status_t error,
if (blk_queue_add_random(q))
add_disk_randomness(req->rq_disk);
+ if (!blk_rq_is_scsi(req)) {
+ WARN_ON_ONCE(!(cmd->flags & SCMD_INITIALIZED));
+ cmd->flags &= ~SCMD_INITIALIZED;
+ }
+
if (req->mq_ctx) {
/*
* In the MQ case the command gets freed by __blk_mq_end_request,
@@ -1110,7 +1115,8 @@ EXPORT_SYMBOL(scsi_init_io);
* scsi_initialize_rq - initialize struct scsi_cmnd.req
* @rq: Request associated with the SCSI command to be initialized.
*
- * Called from inside blk_get_request().
+ * Called from inside blk_get_request() for pass-through requests and from
+ * inside scsi_init_command() for filesystem requests.
*/
void scsi_initialize_rq(struct request *rq)
{
@@ -1154,7 +1160,13 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
{
void *buf = cmd->sense_buffer;
void *prot = cmd->prot_sdb;
- unsigned int unchecked_isa_dma = cmd->flags & SCMD_UNCHECKED_ISA_DMA;
+ struct request *rq = blk_mq_rq_from_pdu(cmd);
+ unsigned int flags = cmd->flags & SCMD_PRESERVED_FLAGS;
+
+ if (!blk_rq_is_scsi(rq) && !(flags & SCMD_INITIALIZED)) {
+ flags |= SCMD_INITIALIZED;
+ scsi_initialize_rq(rq);
+ }
/* zero out the cmd, except for the embedded scsi_request */
memset((char *)cmd + sizeof(cmd->req), 0,
@@ -1163,7 +1175,7 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
cmd->device = dev;
cmd->sense_buffer = buf;
cmd->prot_sdb = prot;
- cmd->flags = unchecked_isa_dma;
+ cmd->flags = flags;
INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler);
cmd->jiffies_at_alloc = jiffies;
@@ -1350,6 +1362,8 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
ret = scsi_setup_cmnd(sdev, req);
out:
+ if (ret != BLKPREP_OK)
+ cmd->flags &= ~SCMD_INITIALIZED;
return scsi_prep_return(q, req, ret);
}
@@ -1869,6 +1883,7 @@ static int scsi_mq_prep_fn(struct request *req)
struct scsi_device *sdev = req->q->queuedata;
struct Scsi_Host *shost = sdev->host;
struct scatterlist *sg;
+ int ret;
scsi_init_command(sdev, cmd);
@@ -1902,7 +1917,10 @@ static int scsi_mq_prep_fn(struct request *req)
blk_mq_start_request(req);
- return scsi_setup_cmnd(sdev, req);
+ ret = scsi_setup_cmnd(sdev, req);
+ if (ret != BLK_STS_OK)
+ cmd->flags &= ~SCMD_INITIALIZED;
+ return ret;
}
static void scsi_mq_done(struct scsi_cmnd *cmd)

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