[PATCH 1/3] btrfs-progs: scan /proc/partitions not all of /dev with "-d"

[Eric Sandeen <sandeen@redhat.com>]

We can scan for btrfs devices in a few ways.  By default
libblkid is used for "device scan" and "filesystem show";
with the -m option only mounted filesystems are scanned,
and with -d we physically read every system device.

But there's no reason for the complexity of a descent through
/dev; /proc/partitions has every device known to the kernel, so
just use that when -d is specified.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
diff --git a/cmds-device.c b/cmds-device.c
index b6772b9..519681a 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -224,7 +224,7 @@ static int cmd_scan_dev(int argc, char **argv)
 			break;
 		switch (c) {
 		case 'd':
-			where = BTRFS_SCAN_DEV;
+			where = BTRFS_SCAN_PROC;
 			all = 1;
 			break;
 		default:
diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index bf87bbe..0ad7e8f 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -614,7 +614,7 @@ static int cmd_show(int argc, char **argv)
 			break;
 		switch (c) {
 		case 'd':
-			where = BTRFS_SCAN_DEV;
+			where = BTRFS_SCAN_PROC;
 			break;
 		case 'm':
 			where = BTRFS_SCAN_MOUNTED;
@@ -638,7 +638,7 @@ static int cmd_show(int argc, char **argv)
 		 * right away
 		 */
 		if (type == BTRFS_ARG_BLKDEV) {
-			if (where == BTRFS_SCAN_DEV) {
+			if (where == BTRFS_SCAN_PROC) {
 				/* we need to do this because
 				 * legacy BTRFS_SCAN_DEV
 				 * provides /dev/dm-x paths
@@ -681,7 +681,7 @@ static int cmd_show(int argc, char **argv)
 		}
 	}
 
-	if (where == BTRFS_SCAN_DEV)
+	if (where == BTRFS_SCAN_PROC)
 		goto devs_only;
 
 	/* show mounted btrfs */