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authorMike Christie <mchristi@redhat.com>2017-06-23 09:18:16 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2017-07-07 09:11:39 +0300
commitb1943fd454d1a2e2c8018a2f79a7023893619439 (patch)
tree97d1eaff4db5e721869d71d93f97708661da1b05 /drivers/target
parentb3af66e24393f03ef81db17a11387d9e6174bd01 (diff)
downloadlinux-b1943fd454d1a2e2c8018a2f79a7023893619439.tar.xz
target: add helper to iterate over devices
This adds a wrapper around idr_for_each so the xcopy code can loop over the devices in the next patch. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_device.c45
-rw-r--r--drivers/target/target_core_internal.h2
2 files changed, 47 insertions, 0 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index de1131612ddc..bd32a0c65961 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -904,6 +904,51 @@ struct se_device *target_find_device(int id, bool do_depend)
}
EXPORT_SYMBOL(target_find_device);
+struct devices_idr_iter {
+ int (*fn)(struct se_device *dev, void *data);
+ void *data;
+};
+
+static int target_devices_idr_iter(int id, void *p, void *data)
+{
+ struct devices_idr_iter *iter = data;
+ struct se_device *dev = p;
+
+ /*
+ * We add the device early to the idr, so it can be used
+ * by backend modules during configuration. We do not want
+ * to allow other callers to access partially setup devices,
+ * so we skip them here.
+ */
+ if (!(dev->dev_flags & DF_CONFIGURED))
+ return 0;
+
+ return iter->fn(dev, iter->data);
+}
+
+/**
+ * target_for_each_device - iterate over configured devices
+ * @fn: iterator function
+ * @data: pointer to data that will be passed to fn
+ *
+ * fn must return 0 to continue looping over devices. non-zero will break
+ * from the loop and return that value to the caller.
+ */
+int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
+ void *data)
+{
+ struct devices_idr_iter iter;
+ int ret;
+
+ iter.fn = fn;
+ iter.data = data;
+
+ mutex_lock(&g_device_mutex);
+ ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
+ mutex_unlock(&g_device_mutex);
+ return ret;
+}
+
int target_configure_device(struct se_device *dev)
{
struct se_hba *hba = dev->se_hba;
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 0912de7c0cf8..1d3ac0238568 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -87,6 +87,8 @@ void core_dev_release_virtual_lun0(void);
struct se_device *target_alloc_device(struct se_hba *hba, const char *name);
int target_configure_device(struct se_device *dev);
void target_free_device(struct se_device *);
+int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
+ void *data);
/* target_core_configfs.c */
void target_setup_backend_cits(struct target_backend *);