From 01dcca794a4f546ec2ec109d0b2eb27204e7b16e Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 6 Apr 2015 11:47:25 +0200
Subject: [PATCH] btrfs: make btrfs_subvol_snapshot() parameters a flags field

---
 src/shared/btrfs-util.c    | 12 ++++++------
 src/shared/btrfs-util.h    |  9 +++++++--
 src/shared/machine-image.c |  2 +-
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/src/shared/btrfs-util.c b/src/shared/btrfs-util.c
index fc795cb18..34ebaece0 100644
--- a/src/shared/btrfs-util.c
+++ b/src/shared/btrfs-util.c
@@ -101,9 +101,9 @@ int btrfs_is_snapshot(int fd) {
         return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);
 }
 
-int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, bool read_only, bool fallback_copy) {
+int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlags flags) {
         struct btrfs_ioctl_vol_args_v2 args = {
-                .flags = read_only ? BTRFS_SUBVOL_RDONLY : 0,
+                .flags = flags & BTRFS_SNAPSHOT_READ_ONLY ? BTRFS_SUBVOL_RDONLY : 0,
         };
         _cleanup_close_ int new_fd = -1;
         const char *subvolume;
@@ -115,7 +115,7 @@ int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, bool read_only, b
         if (r < 0)
                 return r;
         if (r == 0) {
-                if (!fallback_copy)
+                if (!(flags & BTRFS_SNAPSHOT_FALLBACK_COPY))
                         return -EISDIR;
 
                 r = btrfs_subvol_make(new_path);
@@ -128,7 +128,7 @@ int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, bool read_only, b
                         return r;
                 }
 
-                if (read_only) {
+                if (flags & BTRFS_SNAPSHOT_READ_ONLY) {
                         r = btrfs_subvol_set_read_only(new_path, true);
                         if (r < 0) {
                                 btrfs_subvol_remove(new_path, false);
@@ -156,7 +156,7 @@ int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, bool read_only, b
         return 0;
 }
 
-int btrfs_subvol_snapshot(const char *old_path, const char *new_path, bool read_only, bool fallback_copy) {
+int btrfs_subvol_snapshot(const char *old_path, const char *new_path, BtrfsSnapshotFlags flags) {
         _cleanup_close_ int old_fd = -1;
 
         assert(old_path);
@@ -166,7 +166,7 @@ int btrfs_subvol_snapshot(const char *old_path, const char *new_path, bool read_
         if (old_fd < 0)
                 return -errno;
 
-        return btrfs_subvol_snapshot_fd(old_fd, new_path, read_only, fallback_copy);
+        return btrfs_subvol_snapshot_fd(old_fd, new_path, flags);
 }
 
 int btrfs_subvol_make(const char *path) {
diff --git a/src/shared/btrfs-util.h b/src/shared/btrfs-util.h
index 06ecc11b4..e3ad98750 100644
--- a/src/shared/btrfs-util.h
+++ b/src/shared/btrfs-util.h
@@ -43,13 +43,18 @@ typedef struct BtrfsQuotaInfo {
         uint64_t exclusive_max;
 } BtrfsQuotaInfo;
 
+typedef enum BtrfsSnapshotFlags {
+        BTRFS_SNAPSHOT_FALLBACK_COPY = 1,
+        BTRFS_SNAPSHOT_READ_ONLY = 2,
+} BtrfsSnapshotFlags;
+
 int btrfs_is_snapshot(int fd);
 
 int btrfs_subvol_make(const char *path);
 int btrfs_subvol_make_label(const char *path);
 
-int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, bool read_only, bool fallback_copy);
-int btrfs_subvol_snapshot(const char *old_path, const char *new_path, bool read_only, bool fallback_copy);
+int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlags flags);
+int btrfs_subvol_snapshot(const char *old_path, const char *new_path, BtrfsSnapshotFlags flags);
 
 int btrfs_subvol_set_read_only_fd(int fd, bool b);
 int btrfs_subvol_set_read_only(const char *path, bool b);
diff --git a/src/shared/machine-image.c b/src/shared/machine-image.c
index fb72123f1..ebe5a130f 100644
--- a/src/shared/machine-image.c
+++ b/src/shared/machine-image.c
@@ -491,7 +491,7 @@ int image_clone(Image *i, const char *new_name, bool read_only) {
         case IMAGE_DIRECTORY:
                 new_path = strjoina("/var/lib/machines/", new_name);
 
-                r = btrfs_subvol_snapshot(i->path, new_path, read_only, true);
+                r = btrfs_subvol_snapshot(i->path, new_path, (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | BTRFS_SNAPSHOT_FALLBACK_COPY);
                 break;
 
         case IMAGE_RAW:
-- 
2.30.2