diff mbox series

[RFC,v1,2/8] scsi: create multipath capable scsi host

Message ID 20241109044529.992935-3-himanshu.madhani@oracle.com (mailing list archive)
State New
Headers show
Series scsi: Multipath support for scsi disk devices. | expand

Commit Message

Himanshu Madhani Nov. 9, 2024, 4:45 a.m. UTC 
From: Himanshu Madhani <himanshu.madhani@oracle.com>

- Create multipath capable scsi host

Signed-off-by: Himanshu Madhani <himanshu.madhani@oracle.com>
---
 drivers/scsi/hosts.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Comments

Bart Van Assche Nov. 10, 2024, 9:11 p.m. UTC | #1 
On 11/8/24 8:45 PM, himanshu.madhani@oracle.com wrote:
>   #include "scsi_priv.h"
>   #include "scsi_logging.h"
> @@ -394,6 +395,14 @@ struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int priv
>   	struct Scsi_Host *shost;
>   	int index;
>   
> +#ifdef CONFIG_SCSI_MULTIPATH
> +	struct scsi_mpath *mpath_dev;
> +	size_t	size = sizeof(*mpath_dev);
> +
> +	size += num_possible_nodes() * sizeof(struct mpath_dev *);
> +	privsize = privsize + size;
> +#endif
> +
>   	shost = kzalloc(sizeof(struct Scsi_Host) + privsize, GFP_KERNEL);
>   	if (!shost)
>   		return NULL;
> @@ -409,6 +418,9 @@ struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int priv
>   	init_waitqueue_head(&shost->host_wait);
>   	mutex_init(&shost->scan_mutex);
>   
> +#ifdef CONFIG_SCSI_MULTIPATH
> +	INIT_LIST_HEAD(&shost->mpath_sdev);
> +#endif
>   	index = ida_alloc(&host_index_ida, GFP_KERNEL);
>   	if (index < 0) {
>   		kfree(shost);

 From Documentation/process/4.Coding.rst: "As a general rule, #ifdef use
should be confined to header files whenever possible." Please follow
this advice.

Thanks,

Bart.
diff mbox series

Patch

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index e021f1106bea..3cedb2a9af7b 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -39,6 +39,7 @@ 
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_multipath.h>
 
 #include "scsi_priv.h"
 #include "scsi_logging.h"
@@ -394,6 +395,14 @@  struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int priv
 	struct Scsi_Host *shost;
 	int index;
 
+#ifdef CONFIG_SCSI_MULTIPATH
+	struct scsi_mpath *mpath_dev;
+	size_t	size = sizeof(*mpath_dev);
+
+	size += num_possible_nodes() * sizeof(struct mpath_dev *);
+	privsize = privsize + size;
+#endif
+
 	shost = kzalloc(sizeof(struct Scsi_Host) + privsize, GFP_KERNEL);
 	if (!shost)
 		return NULL;
@@ -409,6 +418,9 @@  struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int priv
 	init_waitqueue_head(&shost->host_wait);
 	mutex_init(&shost->scan_mutex);
 
+#ifdef CONFIG_SCSI_MULTIPATH
+	INIT_LIST_HEAD(&shost->mpath_sdev);
+#endif
 	index = ida_alloc(&host_index_ida, GFP_KERNEL);
 	if (index < 0) {
 		kfree(shost);