New API: btrfs-filesystem-resize (RHBZ#721160).

This resizes a btrfs filesystem.

daemon/Makefile.am

@@ -95,6 +95,7 @@ guestfsd_SOURCES = \
 	base64.c \
 	blkid.c \
 	blockdev.c \
+	btrfs.c \
 	checksum.c \
 	cmp.c \
 	command.c \

daemon/btrfs.c

@@ -0,0 +1,84 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2011 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "daemon.h"
+#include "actions.h"
+#include "optgroups.h"
+
+int
+optgroup_btrfs_available (void)
+{
+  return prog_exists ("btrfs");
+}
+
+/* Takes optional arguments, consult optargs_bitmask. */
+int
+do_btrfs_filesystem_resize (const char *filesystem, int64_t size)
+{
+  char *buf;
+  char *err;
+  int r;
+  const char *argv[16];
+  size_t i = 0;
+  char size_str[32];
+
+  argv[i++] = "btrfs";
+  argv[i++] = "filesystem";
+  argv[i++] = "resize";
+
+  if (optargs_bitmask & GUESTFS_BTRFS_FILESYSTEM_RESIZE_SIZE_BITMASK) {
+    if (size <= 0) {
+      reply_with_error ("size is zero or negative");
+      return -1;
+    }
+
+    snprintf (size_str, sizeof size_str, "%" PRIi64, size);
+    argv[i++] = size_str;
+  }
+  else
+    argv[i++] = "max";
+
+  buf = sysroot_path (filesystem);
+  if (!buf) {
+    reply_with_error ("malloc");
+    return -1;
+  }
+
+  argv[i++] = buf;
+  argv[i++] = NULL;
+
+  r = commandv (NULL, &err, argv);
+  free (buf);
+
+  if (r == -1) {
+    reply_with_error ("%s: %s", filesystem, err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+  return 0;
+}

generator/generator_actions.ml

@@ -6043,6 +6043,29 @@ single filesystem without booting into Windows between each resize.
 
 See also L<ntfsresize(8)>.");
 
+  ("btrfs_filesystem_resize", (RErr, [Pathname "mountpoint"], [Int64 "size"]), 289, [Optional "btrfs"],
+   [],
+   "resize a btrfs filesystem",
+   "\
+This command resizes a btrfs filesystem.
+
+Note that unlike other resize calls, the filesystem has to be
+mounted and the parameter is the mountpoint not the device
+(this is a requirement of btrfs itself).
+
+The optional parameters are:
+
+=over 4
+
+=item C<size>
+
+The new size (in bytes) of the filesystem.  If omitted, the filesystem
+is resized to the maximum size.
+
+=back
+
+See also L<btrfs(8)>.");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions

po/POTFILES.in

@@ -7,6 +7,7 @@ daemon/available.c
 daemon/base64.c
 daemon/blkid.c
 daemon/blockdev.c
+daemon/btrfs.c
 daemon/checksum.c
 daemon/cmp.c
 daemon/command.c

src/MAX_PROC_NR

@@ -1 +1 @@
-288
+289