This function is to register all devices found after scanning
the system. Before we had this functionality with in the
btrfs_scan_lblkid(), however scanning and registering are two
different distinct operation its better keep them separate.
Also we want to optimize btrfs_scan_lblkid and avoid multiple
system scans unless needed. As of now device scan uses this function.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
v1-v3: nothing changed, match version with its partner patch
v4: changes per review comments. moved func to utils.c
tested as below:
cat /proc/fs/btrfs/devlist | egrep fsid
btrfs dev scan
cat /proc/fs/btrfs/devlist | egrep fsid
[fsid: 2440b569-02d7-45a3-966c-8277f0c43f6a]
[fsid: 6c5e1019-db9e-4a60-affd-4de88db14b04]
[fsid: 7ddbe346-f50e-42fc-89c7-a60297772b1f]
utils.c | 27 +++++++++++++++++++++++++++
utils.h | 1 +
2 files changed, 28 insertions(+)
diff --git a/utils.c b/utils.c
index 90e228b..aef0e5e 100644
--- a/utils.c
+++ b/utils.c
@@ -1266,6 +1266,33 @@ int btrfs_register_one_device(char *fname)
return ret;
}
+/*
+ * Register all devices in the fs_uuid list created in the user
+ * space. Ensure btrfs_scan_lblkid() is called before this func.
+ */
+int btrfs_register_all_devices(void)
+{
+ int err;
+ struct btrfs_fs_devices *fs_devices;
+ struct btrfs_device *device;
+ struct list_head *all_uuids;
+
+ all_uuids = btrfs_scanned_uuids();
+
+ list_for_each_entry(fs_devices, all_uuids, list) {
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ if (strlen(device->name) != 0) {
+ err = btrfs_register_one_device(device->name);
+ if (err < 0)
+ return err;
+ if (err > 0)
+ return -err;
+ }
+ }
+ }
+ return 0;
+}
+
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
int super_offset)
{
diff --git a/utils.h b/utils.h
index fea26ef..65df2e4 100644
--- a/utils.h
+++ b/utils.h
@@ -82,6 +82,7 @@ int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
u32 sectorsize);
int btrfs_scan_for_fsid(int run_ioctls);
int btrfs_register_one_device(char *fname);
+int btrfs_register_all_devices(void);
char *canonicalize_dm_name(const char *ptname);
char *canonicalize_path(const char *path);
int check_mounted(const char *devicename);
--
2.0.0.153.g79dcccc
--
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