1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index beed7fbe1cbe..dae59d1da07a 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -48,6 +48,30 @@ const char *scsi_device_state_name(enum scsi_device_state state)
         return name;
 }
 
+static struct {
+        enum scsi_host_state    value;
+        char                    *name;
+} shost_states[] = {
+        { SHOST_CREATED, "created" },
+        { SHOST_RUNNING, "running" },
+        { SHOST_CANCEL, "cancel" },
+        { SHOST_DEL, "deleted" },
+        { SHOST_RECOVERY, "recovery" },
+};
+const char *scsi_host_state_name(enum scsi_host_state state)
+{
+        int i;
+        char *name = NULL;
+
+        for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) {
+                if (shost_states[i].value == state) {
+                        name = shost_states[i].name;
+                        break;
+                }
+        }
+        return name;
+}
+
 static int check_set(unsigned int *val, char *src)
 {
         char *last;
@@ -124,6 +148,43 @@ static ssize_t store_scan(struct class_device *class_dev, const char *buf,
 };
 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 
+static ssize_t
+store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
+{
+        int i;
+        struct Scsi_Host *shost = class_to_shost(class_dev);
+        enum scsi_host_state state = 0;
+
+        for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) {
+                const int len = strlen(shost_states[i].name);
+                if (strncmp(shost_states[i].name, buf, len) == 0 &&
+                   buf[len] == '\n') {
+                        state = shost_states[i].value;
+                        break;
+                }
+        }
+        if (!state)
+                return -EINVAL;
+
+        if (scsi_host_set_state(shost, state))
+                return -EINVAL;
+        return count;
+}
+
+static ssize_t
+show_shost_state(struct class_device *class_dev, char *buf)
+{
+        struct Scsi_Host *shost = class_to_shost(class_dev);
+        const char *name = scsi_host_state_name(shost->shost_state);
+
+        if (!name)
+                return -EINVAL;
+
+        return snprintf(buf, 20, "%s\n", name);
+}
+
+static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
+
 shost_rd_attr(unique_id, "%u\n");
 shost_rd_attr(host_busy, "%hu\n");
 shost_rd_attr(cmd_per_lun, "%hd\n");
@@ -139,6 +200,7 @@ static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
         &class_device_attr_unchecked_isa_dma,
         &class_device_attr_proc_name,
         &class_device_attr_scan,
+        &class_device_attr_state,
         NULL
 };