btrfs-progs: move get_fsid() to utils.c

Make get_fsid() to a common functions.
This will be used for 'subvol delete --commit-after'.

Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Qu Wenruo <quwenruo.btrfs@gmx.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/utils.c b/utils.c
index 7a2710fe..39629a79 100644
--- a/utils.c
+++ b/utils.c
@@ -1758,6 +1758,36 @@ out:
 	return ret;
 }
 
+int get_fsid(const char *path, u8 *fsid, int silent)
+{
+	int ret;
+	int fd;
+	struct btrfs_ioctl_fs_info_args args;
+
+	fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		ret = -errno;
+		if (!silent)
+			error("failed to open %s: %s", path,
+				strerror(-ret));
+		goto out;
+	}
+
+	ret = ioctl(fd, BTRFS_IOC_FS_INFO, &args);
+	if (ret < 0) {
+		ret = -errno;
+		goto out;
+	}
+
+	memcpy(fsid, args.fsid, BTRFS_FSID_SIZE);
+	ret = 0;
+
+out:
+	if (fd != -1)
+		close(fd);
+	return ret;
+}
+
 static int group_profile_devs_min(u64 flag)
 {
 	switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {