Btrfs-progs: add btrfs device ready command

This command will be used by things like dracut that wish to know very
simply if all of the devices have been added to the kernel cache yet for the
device to be fully mounted.  This keeps initrd's from constantly having to
try to mount the file system until it succeeds every time a device is added
to the system.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Gene Czarcinski <gene@czarc.net>

1 files changed, 35 insertions, 0 deletions

diff --git a/cmds-device.c b/cmds-device.c
index 4787aca1..75ee293d 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -250,11 +250,46 @@ static int cmd_scan_dev(int argc, char **argv)
 	return 0;
 }
 
+static const char * const cmd_ready_dev_usage[] = {
+	"btrfs device ready <device>",
+	"Check device to see if it has all of it's devices in cache for mounting",
+	NULL
+};
+
+static int cmd_ready_dev(int argc, char **argv)
+{
+	struct	btrfs_ioctl_vol_args args;
+	int	fd;
+	int	ret;
+
+	if (check_argc_min(argc, 2))
+		usage(cmd_ready_dev_usage);
+
+	fd = open("/dev/btrfs-control", O_RDWR);
+	if (fd < 0) {
+		perror("failed to open /dev/btrfs-control");
+		return 10;
+	}
+
+	strncpy(args.name, argv[argc - 1], BTRFS_PATH_NAME_MAX);
+	ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
+	if (ret < 0) {
+		fprintf(stderr, "ERROR: unable to determine if the device '%s'"
+			" is ready for mounting - %s\n", argv[argc - 1],
+			strerror(errno));
+		ret = 1;
+	}
+
+	close(fd);
+	return ret;
+}
+
 const struct cmd_group device_cmd_group = {
 	device_cmd_group_usage, NULL, {
 		{ "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
 		{ "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
 		{ "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
+		{ "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 },
 		{ 0, 0, 0, 0, 0 }
 	}
 };