New API: fstrim - allow filesystem trim.

2 files changed, 98 insertions, 0 deletions

diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 02c21df9..9e2a633a 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -114,6 +114,7 @@ guestfsd_SOURCES = \
 	fill.c \
 	find.c \
 	fsck.c \
+	fstrim.c \
 	glob.c \
 	grep.c \
 	grub.c \
diff --git a/daemon/fstrim.c b/daemon/fstrim.c
new file mode 100644
index 00000000..e2daf6a9
--- /dev/null
+++ b/daemon/fstrim.c
@@ -0,0 +1,97 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include "guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+#include "optgroups.h"
+
+#define MAX_ARGS 64
+
+int
+optgroup_fstrim_available (void)
+{
+  return prog_exists ("fstrim");
+}
+
+/* Takes optional arguments, consult optargs_bitmask. */
+int
+do_fstrim (const char *path,
+           int64_t offset, int64_t length, int64_t minimumfreeextent)
+{
+  const char *argv[MAX_ARGS];
+  size_t i = 0;
+  char offset_s[64], length_s[64], mfe_s[64];
+  char *err;
+  int r;
+
+  ADD_ARG (argv, i, "fstrim");
+
+  if ((optargs_bitmask & GUESTFS_FSTRIM_OFFSET_BITMASK)) {
+    if (offset < 0) {
+      reply_with_error ("offset < 0");
+      return -1;
+    }
+
+    snprintf (offset_s, sizeof offset_s, "%" PRIi64, offset);
+    ADD_ARG (argv, i, "-o");
+    ADD_ARG (argv, i, offset_s);
+  }
+
+  if ((optargs_bitmask & GUESTFS_FSTRIM_LENGTH_BITMASK)) {
+    if (length <= 0) {
+      reply_with_error ("length <= 0");
+      return -1;
+    }
+
+    snprintf (length_s, sizeof length_s, "%" PRIi64, length);
+    ADD_ARG (argv, i, "-l");
+    ADD_ARG (argv, i, length_s);
+  }
+
+  if ((optargs_bitmask & GUESTFS_FSTRIM_MINIMUMFREEEXTENT_BITMASK)) {
+    if (minimumfreeextent <= 0) {
+      reply_with_error ("minimumfreeextent <= 0");
+      return -1;
+    }
+
+    snprintf (mfe_s, sizeof mfe_s, "%" PRIi64, minimumfreeextent);
+    ADD_ARG (argv, i, "-m");
+    ADD_ARG (argv, i, mfe_s);
+  }
+
+  ADD_ARG (argv, i, path);
+  ADD_ARG (argv, i, NULL);
+
+  r = commandv (NULL, &err, argv);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    free (err);
+    return -1;
+  }
+  free (err);
+
+  return 0;
+}