8:39 a.m.
---
daemon/Makefile.am | 2 +
daemon/md.c | 125 ++++++++++++----------------------------------
daemon/md.ml | 48 ++++++++++++++++++
daemon/md.mli | 19 +++++++
generator/actions_core.ml | 1 +
5 files changed, 101 insertions(+), 94 deletions(-)
diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index e9c71ba3c..62ce49498 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -265,6 +265,7 @@ SOURCES_MLI = \
ldm.mli \
link.mli \
lvm.mli \
+ md.mli \
mount.mli \
mountable.mli \
parted.mli \
@@ -285,6 +286,7 @@ SOURCES_ML = \
ldm.ml \
link.ml \
lvm.ml \
+ md.ml \
mount.ml \
parted.ml \
realpath.ml \
diff --git a/daemon/md.c b/daemon/md.c
index 64d98fae5..5c9ecd136 100644
--- a/daemon/md.c
+++ b/daemon/md.c
@@ -24,7 +24,6 @@
#include <inttypes.h>
#include <unistd.h>
#include <fcntl.h>
-#include <glob.h>
#ifdef HAVE_LINUX_RAID_MD_U_H
#include <sys/ioctl.h>
@@ -32,6 +31,8 @@
#include <linux/raid/md_u.h>
#endif /* HAVE_LINUX_RAID_MD_U_H */
+#include <caml/mlvalues.h>
+
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
@@ -45,6 +46,35 @@ optgroup_mdadm_available (void)
return prog_exists (str_mdadm);
}
+/* Check if 'dev' is a real RAID device, because in the case where md
+ * is linked directly into the kernel (not a module), /dev/md0 is
+ * sometimes created. This is called from OCaml function
+ * Md.list_md_devices.
+ */
+extern value guestfs_int_daemon_is_raid_device (value devicev);
+
+/* NB: This is a "noalloc" call. */
+value
+guestfs_int_daemon_is_raid_device (value devv)
+{
+ const char *dev = String_val (devv);
+ int ret = 1;
+
+#if defined(HAVE_LINUX_RAID_MD_U_H) && defined(GET_ARRAY_INFO)
+ int fd;
+ mdu_array_info_t array;
+
+ fd = open (dev, O_RDONLY);
+ if (fd >= 0) {
+ if (ioctl (fd, GET_ARRAY_INFO, &array) == -1 && errno == ENODEV)
+ ret = 0;
+ close (fd);
+ }
+#endif
+
+ return Val_bool (ret);
+}
+
static size_t
count_bits (uint64_t bitmap)
{
@@ -188,99 +218,6 @@ do_md_create (const char *name, char *const *devices,
#pragma GCC diagnostic pop
#endif
-static int
-glob_errfunc (const char *epath, int eerrno)
-{
- fprintf (stderr, "glob: failure reading %s: %s\n", epath, strerror
(eerrno));
- return 1;
-}
-
-/* Check if 'dev' is a real RAID device, because in the case where md
- * is linked directly into the kernel (not a module), /dev/md0 is
- * sometimes created.
- */
-static int
-is_raid_device (const char *dev)
-{
- int ret = 1;
-
-#if defined(HAVE_LINUX_RAID_MD_U_H) && defined(GET_ARRAY_INFO)
- int fd;
- mdu_array_info_t array;
-
- fd = open (dev, O_RDONLY);
- if (fd >= 0) {
- if (ioctl (fd, GET_ARRAY_INFO, &array) == -1 && errno == ENODEV)
- ret = 0;
- close (fd);
- }
-#endif
-
- return ret;
-}
-
-char **
-do_list_md_devices (void)
-{
- CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (ret);
- glob_t mds;
-
- memset (&mds, 0, sizeof mds);
-
-#define PREFIX "/sys/block/md"
-#define SUFFIX "/md"
-
- /* Look for directories under /sys/block matching md[0-9]*
- * As an additional check, we also make sure they have a md subdirectory.
- */
- const int err = glob (PREFIX "[0-9]*" SUFFIX, GLOB_ERR, glob_errfunc,
&mds);
- if (err == GLOB_NOSPACE) {
- reply_with_error ("glob: returned GLOB_NOSPACE: "
- "rerun with LIBGUESTFS_DEBUG=1");
- goto error;
- } else if (err == GLOB_ABORTED) {
- reply_with_error ("glob: returned GLOB_ABORTED: "
- "rerun with LIBGUESTFS_DEBUG=1");
- goto error;
- }
-
- for (size_t i = 0; i < mds.gl_pathc; i++) {
- size_t len;
- char *dev, *n;
-
- len = strlen (mds.gl_pathv[i]) - strlen (PREFIX) - strlen (SUFFIX);
-
-#define DEV "/dev/md"
- dev = malloc (strlen (DEV) + len + 1);
- if (NULL == dev) {
- reply_with_perror ("malloc");
- goto error;
- }
-
- n = dev;
- n = mempcpy (n, DEV, strlen (DEV));
- n = mempcpy (n, &mds.gl_pathv[i][strlen (PREFIX)], len);
- *n = '\0';
-
- if (!is_raid_device (dev)) {
- free (dev);
- continue;
- }
-
- if (add_string_nodup (&ret, dev) == -1) goto error;
- }
-
- if (end_stringsbuf (&ret) == -1) goto error;
- globfree (&mds);
-
- return take_stringsbuf (&ret);
-
- error:
- globfree (&mds);
-
- return NULL;
-}
-
char **
do_md_detail (const char *md)
{
diff --git a/daemon/md.ml b/daemon/md.ml
new file mode 100644
index 000000000..caf87cf8f
--- /dev/null
+++ b/daemon/md.ml
@@ -0,0 +1,48 @@
+(* guestfs-inspection
+ * Copyright (C) 2009-2017 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.
+ *)
+
+open Printf
+
+open Std_utils
+
+open Utils
+
+external is_raid_device : string -> bool =
+ "guestfs_int_daemon_is_raid_device" "noalloc"
+
+let re_md = Str.regexp "^md[0-9]+$"
+
+let list_md_devices () =
+ (* Look for directories under /sys/block matching md[0-9]+
+ * As an additional check, we also make sure they have a md subdirectory.
+ *)
+ let devs = Sys.readdir "/sys/block" in
+ let devs = Array.to_list devs in
+ let devs = List.filter (fun d -> Str.string_match re_md d 0) devs in
+ let devs = List.filter (
+ fun d -> is_directory (sprintf "/sys/block/%s/md" d)
+ ) devs in
+
+ (* Construct the equivalent /dev/md[0-9]+ device names. *)
+ let devs = List.map ((^) "/dev/") devs in
+
+ (* Check they are really RAID devices. *)
+ let devs = List.filter is_raid_device devs in
+
+ (* Return the list sorted. *)
+ sort_device_names devs
diff --git a/daemon/md.mli b/daemon/md.mli
new file mode 100644
index 000000000..56b6ea65e
--- /dev/null
+++ b/daemon/md.mli
@@ -0,0 +1,19 @@
+(* guestfs-inspection
+ * Copyright (C) 2009-2017 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.
+ *)
+
+val list_md_devices : unit -> string list
diff --git a/generator/actions_core.ml b/generator/actions_core.ml
index f6f006eee..140ba6c1b 100644
--- a/generator/actions_core.ml
+++ b/generator/actions_core.ml
@@ -6632,6 +6632,7 @@ If not set, this defaults to C<raid1>.
{ defaults with
name = "list_md_devices"; added = (1, 15, 4);
style = RStringList (RDevice, "devices"), [], [];
+ impl = OCaml "Md.list_md_devices";
shortdesc = "list Linux md (RAID) devices";
longdesc = "\
List all Linux md devices." };
--
2.13.2