nspawn: add fallback top normal copy/reflink when we cannot btrfs snapshot

Given that other file systems (notably: xfs) support reflinks these days, let's
extend the file system snapshotting logic to fall back to plan copies or
reflinks when full btrfs subvolume snapshots are not available.

This essentially makes "systemd-nspawn --ephemeral" and "systemd-nspawn
--template=" available on non-btrfs subvolumes. Of course, both operations will
still be slower on non-btrfs than on btrfs (simply because reflinking each file
individually in a directory tree is still slower than doing this in one step
for a whole subvolume), but it's probably good enough for many cases, and we
should provide the users with the tools, they have to figure out what's good
for them.

Note that "machinectl clone" already had a fallback like this in place, this
patch generalizes this, and adds similar support to our other cases.

src/basic/btrfs-util.c

@@ -20,6 +20,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
+#include <linux/fs.h>
 #include <linux/loop.h>
 #include <stddef.h>
 #include <stdio.h>
@@ -38,6 +39,7 @@
 #include "alloc-util.h"
 #include "btrfs-ctree.h"
 #include "btrfs-util.h"
+#include "chattr-util.h"
 #include "copy.h"
 #include "fd-util.h"
 #include "fileio.h"
@@ -45,6 +47,7 @@
 #include "macro.h"
 #include "missing.h"
 #include "path-util.h"
+#include "rm-rf.h"
 #include "selinux-util.h"
 #include "smack-util.h"
 #include "sparse-endian.h"
@@ -1718,28 +1721,46 @@ int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlag
         if (r < 0)
                 return r;
         if (r == 0) {
+                bool plain_directory = false;
+
+                /* If the source isn't a proper subvolume, fail unless fallback is requested */
                 if (!(flags & BTRFS_SNAPSHOT_FALLBACK_COPY))
                         return -EISDIR;
 
                 r = btrfs_subvol_make(new_path);
-                if (r < 0)
+                if (r == -ENOTTY && (flags & BTRFS_SNAPSHOT_FALLBACK_DIRECTORY)) {
+                        /* If the destination doesn't support subvolumes, then use a plain directory, if that's requested. */
+                        if (mkdir(new_path, 0755) < 0)
+                                return r;
+
+                        plain_directory = true;
+                } else if (r < 0)
                         return r;
 
                 r = copy_directory_fd(old_fd, new_path, true);
-                if (r < 0) {
-                        (void) btrfs_subvol_remove(new_path, BTRFS_REMOVE_QUOTA);
-                        return r;
-                }
+                if (r < 0)
+                        goto fallback_fail;
 
                 if (flags & BTRFS_SNAPSHOT_READ_ONLY) {
-                        r = btrfs_subvol_set_read_only(new_path, true);
-                        if (r < 0) {
-                                (void) btrfs_subvol_remove(new_path, BTRFS_REMOVE_QUOTA);
-                                return r;
+
+                        if (plain_directory) {
+                                /* Plain directories have no recursive read-only flag, but something pretty close to
+                                 * it: the IMMUTABLE bit. Let's use this here, if this is requested. */
+
+                                if (flags & BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE)
+                                        (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL);
+                        } else {
+                                r = btrfs_subvol_set_read_only(new_path, true);
+                                if (r < 0)
+                                        goto fallback_fail;
                         }
                 }
 
                 return 0;
+
+        fallback_fail:
+                (void) rm_rf(new_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
+                return r;
         }
 
         r = extract_subvolume_name(new_path, &subvolume);

src/basic/btrfs-util.h

@@ -45,10 +45,12 @@ typedef struct BtrfsQuotaInfo {
 } BtrfsQuotaInfo;
 
 typedef enum BtrfsSnapshotFlags {
-        BTRFS_SNAPSHOT_FALLBACK_COPY = 1,
+        BTRFS_SNAPSHOT_FALLBACK_COPY = 1,        /* If the source isn't a subvolume, reflink everything */
         BTRFS_SNAPSHOT_READ_ONLY = 2,
         BTRFS_SNAPSHOT_RECURSIVE = 4,
         BTRFS_SNAPSHOT_QUOTA = 8,
+        BTRFS_SNAPSHOT_FALLBACK_DIRECTORY = 16,  /* If the destination doesn't support subvolumes, reflink/copy instead */
+        BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE = 32,  /* When we can't create a subvolume, use the FS_IMMUTABLE attribute for indicating read-only */
 } BtrfsSnapshotFlags;
 
 typedef enum BtrfsRemoveFlags {