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Chen Hanxiao

2015-Jun-26 07:00 UTC

[Libguestfs] [PATCH v3 0/4] uuid: add btrfs uuid change support and some rework

- Btrfs-progs v4.1 introduced new feature of changing
  uuid of btrfs partition.
  This patch add support of this.

- uuids.c did a lot of deplicated work for changing uuid
  of fs. Use existing functions.

v3: set errno if feature is not available.

Chen Hanxiao (4):
  uuid: add support to change uuid of btrfs partition
  uuid: use existing function of ext2
  uuid: use newly introduced xfs_set_uuid of xfs
  uuid: use newly introduced swap_set_uuid

 daemon/btrfs.c                 | 60 ++++++++++++++++++++++++++++++++++++++++++
 daemon/daemon.h                |  5 ++++
 daemon/swap.c                  | 16 +++++++++++
 daemon/uuids.c                 | 48 ++++-----------------------------
 daemon/xfs.c                   |  7 +++++
 tests/btrfs/test-btrfs-misc.pl | 17 ++++++++++++
 6 files changed, 110 insertions(+), 43 deletions(-)

-- 
2.1.0

Chen Hanxiao

2015-Jun-26 07:00 UTC

head link

[Libguestfs] [PATCH v3 1/4] uuid: add support to change uuid of btrfs partition

btrfs-progs v4.1 add support to change uuid of btrfs fs.

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
v3: set errno as ENOTSUP when btrfstune -u is not available
v2: put btrfs operation back to daemon/btrfs.c
    move tests to tests/btrfs

 daemon/btrfs.c                 | 60 ++++++++++++++++++++++++++++++++++++++++++
 daemon/daemon.h                |  1 +
 daemon/uuids.c                 |  6 ++---
 tests/btrfs/test-btrfs-misc.pl | 17 ++++++++++++
 4 files changed, 80 insertions(+), 4 deletions(-)

diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index 20e5e6b..80b7d80 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -790,6 +790,44 @@ do_btrfs_device_delete (char *const *devices, const char
*fs)
   return 0;
 }
 
+
+/* btrfstune command add two new options
+ * -U UUID      change fsid to UUID
+ * -u           change fsid, use a random one
+ * since v4.1
+ * We could check wheter 'btrfstune' support
+ * '-u' and '-U UUID' option by checking the output of
+ * 'btrfstune' command.
+ */
+static int
+test_btrftune_uuid_opt (void)
+{
+  static int result = -1;
+  if (result != -1)
+    return result;
+
+  CLEANUP_FREE char *err = NULL;
+
+  int r = commandr (NULL, &err, str_btrfstune, NULL);
+
+  if (r == -1) {
+    reply_with_error ("btrfstune: %s", err);
+    return -1;
+  }
+
+  /* FIXME currently btrfstune do not support '--help'.
+   * If got an invalid options, it will print its usage
+   * in stderr.
+   * We had to check it there.
+   */
+  if (strstr (err, "-U") == NULL || strstr (err, "-u") ==
NULL)
+    result = 0;
+  else
+    result = 1;
+
+  return result;
+}
+
 int
 do_btrfs_set_seeding (const char *device, int svalue)
 {
@@ -807,6 +845,28 @@ do_btrfs_set_seeding (const char *device, int svalue)
   return 0;
 }
 
+int
+btrfs_set_uuid (const char *device, const char *uuid)
+{
+  CLEANUP_FREE char *err = NULL;
+  int r;
+  int has_uuid_opts = test_btrftune_uuid_opt ();
+
+  if (has_uuid_opts <= 0) {
+    reply_with_error_errno (ENOTSUP, "btrfs filesystems' UUID cannot
be changed");
+    return -1;
+  }
+
+  r = commandr (NULL, &err, str_btrfstune, "-f", "-U",
uuid, device, NULL);
+
+  if (r == -1) {
+    reply_with_error ("%s: %s", device, err);
+    return -1;
+  }
+
+  return 0;
+}
+
 /* Takes optional arguments, consult optargs_bitmask. */
 int
 do_btrfs_fsck (const char *device, int64_t superblock, int repair)
diff --git a/daemon/daemon.h b/daemon/daemon.h
index 136e9a9..b74ba3c 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -268,6 +268,7 @@ extern char *debug_bmap_device (const char *subcmd, size_t
argc, char *const *co
 
 /*-- in btrfs.c --*/
 extern char *btrfs_get_label (const char *device);
+extern int btrfs_set_uuid (const char *device, const char *uuid);
 
 /*-- in ntfs.c --*/
 extern char *ntfs_get_label (const char *device);
diff --git a/daemon/uuids.c b/daemon/uuids.c
index 06b33e9..f98d8e5 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -110,10 +110,8 @@ do_set_uuid (const char *device, const char *uuid)
   else if (STREQ (vfs_type, "swap"))
     r = swapuuid (device, uuid);
 
-  else if (STREQ (vfs_type, "btrfs")) {
-    reply_with_error ("btrfs filesystems' UUID cannot be
changed");
-    r = -1;
-  }
+  else if (STREQ (vfs_type, "btrfs"))
+    r = btrfs_set_uuid (device, uuid);
 
   else {
     reply_with_error ("don't know how to set the UUID for '%s'
filesystems",
diff --git a/tests/btrfs/test-btrfs-misc.pl b/tests/btrfs/test-btrfs-misc.pl
index 2fe7c59..b47caab 100755
--- a/tests/btrfs/test-btrfs-misc.pl
+++ b/tests/btrfs/test-btrfs-misc.pl
@@ -20,6 +20,7 @@
 
 use strict;
 use warnings;
+use Errno;
 
 use Sys::Guestfs;
 
@@ -47,5 +48,21 @@ my $label = $g->vfs_label ("/dev/sda1");
 die "unexpected label: expecting 'newlabel' but got
'$label'"
     unless $label eq "newlabel";
 
+# Setting btrfs UUID
+eval {
+    $g->set_uuid ("/dev/sda1",
"12345678-1234-1234-1234-123456789012");
+};
+# FIXME: ignore ESRCH
+my $err = $g->last_errno ();
+
+if ($err == 0) {
+    my $uuid = $g->vfs_uuid ("/dev/sda1");
+    die "unexpected uuid expecting
+     '12345678-1234-1234-1234-123456789012' but got
'$uuid'"
+    unless $uuid eq "12345678-1234-1234-1234-123456789012";
+} elsif ($err == Errno::ENOTSUP()) {
+    warn "$0: skipping test for btrfs UUID change feature is not
available\n";
+}
+
 $g->shutdown ();
 $g->close ();
-- 
2.1.0

Chen Hanxiao

2015-Jun-26 07:00 UTC

head link

[Libguestfs] [PATCH v3 2/4] uuid: use existing function of ext2

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
v3: improve commit log

 daemon/uuids.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/daemon/uuids.c b/daemon/uuids.c
index f98d8e5..b8b820a 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -27,16 +27,12 @@
 #include "actions.h"
 #include "optgroups.h"
 
-GUESTFSD_EXT_CMD(str_tune2fs, tune2fs);
 GUESTFSD_EXT_CMD(str_xfs_admin, xfs_admin);
 GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
 
 static int
 e2uuid (const char *device, const char *uuid)
 {
-  int r;
-  CLEANUP_FREE char *err = NULL;
-
   /* Don't allow the magic values here.  If callers want to do this
    * we'll add alternate set_uuid_* calls.
    */
@@ -46,13 +42,7 @@ e2uuid (const char *device, const char *uuid)
     return -1;
   }
 
-  r = command (NULL, &err, str_tune2fs, "-U", uuid, device,
NULL);
-  if (r == -1) {
-    reply_with_error ("%s", err);
-    return -1;
-  }
-
-  return 0;
+  return do_set_e2uuid (device, uuid);
 }
 
 static int
-- 
2.1.0

Chen Hanxiao

2015-Jun-26 07:00 UTC

head link

[Libguestfs] [PATCH v3 3/4] uuid: use newly introduced xfs_set_uuid of xfs

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
v3: rename do_xfs_admin_uuid to xfs_set_uuid

 daemon/daemon.h |  1 +
 daemon/uuids.c  | 12 +-----------
 daemon/xfs.c    |  7 +++++++
 3 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/daemon/daemon.h b/daemon/daemon.h
index b74ba3c..7d5691f 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -260,6 +260,7 @@ extern int copy_xattrs (const char *src, const char *dest);
 /*-- in xfs.c --*/
 /* Documented in xfs_admin(8). */
 #define XFS_LABEL_MAX 12
+extern int xfs_set_uuid (const char *device, const char *uuid);
 
 /*-- debug-bmap.c --*/
 extern char *debug_bmap (const char *subcmd, size_t argc, char *const *const
argv);
diff --git a/daemon/uuids.c b/daemon/uuids.c
index b8b820a..dce0d60 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -27,7 +27,6 @@
 #include "actions.h"
 #include "optgroups.h"
 
-GUESTFSD_EXT_CMD(str_xfs_admin, xfs_admin);
 GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
 
 static int
@@ -48,22 +47,13 @@ e2uuid (const char *device, const char *uuid)
 static int
 xfsuuid (const char *device, const char *uuid)
 {
-  int r;
-  CLEANUP_FREE char *err = NULL;
-
   /* Don't allow special values. */
   if (STREQ (uuid, "nil") || STREQ (uuid, "generate")) {
     reply_with_error ("xfs: invalid new UUID");
     return -1;
   }
 
-  r = command (NULL, &err, str_xfs_admin, "-U", uuid, device,
NULL);
-  if (r == -1) {
-    reply_with_error ("%s", err);
-    return -1;
-  }
-
-  return 0;
+  return xfs_set_uuid (device, uuid);
 }
 
 static int
diff --git a/daemon/xfs.c b/daemon/xfs.c
index 687013b..fb7acb4 100644
--- a/daemon/xfs.c
+++ b/daemon/xfs.c
@@ -456,6 +456,13 @@ do_xfs_growfs (const char *path,
 }
 
 int
+xfs_set_uuid (const char *device, const char *uuid)
+{
+  optargs_bitmask = GUESTFS_XFS_ADMIN_UUID_BITMASK;
+  return do_xfs_admin (device, 0, 0, 0, 0, 0, NULL, uuid);
+}
+
+int
 do_xfs_admin (const char *device,
               int extunwritten, int imgfile, int v2log,
               int projid32bit,
-- 
2.1.0

Chen Hanxiao

2015-Jun-26 07:00 UTC

head link

[Libguestfs] [PATCH v3 4/4] uuid: use newly introduced swap_set_uuid

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
v3: move swapuuid to swap.c
    rename it as swap_set_uuid

 daemon/daemon.h |  3 +++
 daemon/swap.c   | 16 ++++++++++++++++
 daemon/uuids.c  | 18 +-----------------
 3 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/daemon/daemon.h b/daemon/daemon.h
index 7d5691f..d4c8c11 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -274,6 +274,9 @@ extern int btrfs_set_uuid (const char *device, const char
*uuid);
 /*-- in ntfs.c --*/
 extern char *ntfs_get_label (const char *device);
 
+/*-- in swap.c --*/
+extern int swap_set_uuid (const char *device, const char *uuid);
+
 /* ordinary daemon functions use these to indicate errors
  * NB: you don't need to prefix the string with the current command,
  * it is added automatically by the client-side RPC stubs.
diff --git a/daemon/swap.c b/daemon/swap.c
index 83f4d7c..26fe30d 100644
--- a/daemon/swap.c
+++ b/daemon/swap.c
@@ -33,6 +33,7 @@
 GUESTFSD_EXT_CMD(str_mkswap, mkswap);
 GUESTFSD_EXT_CMD(str_swapon, swapon);
 GUESTFSD_EXT_CMD(str_swapoff, swapoff);
+GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
 
 /* Confirmed this is true for Linux swap partitions from the Linux sources. */
 #define SWAP_LABEL_MAX 16
@@ -239,3 +240,18 @@ do_swapoff_uuid (const char *uuid)
 {
   return swaponoff (str_swapoff, "-U", uuid);
 }
+
+int
+swap_set_uuid (const char *device, const char *uuid)
+{
+  int r;
+  CLEANUP_FREE char *err = NULL;
+
+  r = command (NULL, &err, str_swaplabel, "-U", uuid, device,
NULL);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    return -1;
+  }
+
+  return 0;
+}
diff --git a/daemon/uuids.c b/daemon/uuids.c
index dce0d60..5238f3e 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -27,7 +27,6 @@
 #include "actions.h"
 #include "optgroups.h"
 
-GUESTFSD_EXT_CMD(str_swaplabel, swaplabel);
 
 static int
 e2uuid (const char *device, const char *uuid)
@@ -56,21 +55,6 @@ xfsuuid (const char *device, const char *uuid)
   return xfs_set_uuid (device, uuid);
 }
 
-static int
-swapuuid (const char *device, const char *uuid)
-{
-  int r;
-  CLEANUP_FREE char *err = NULL;
-
-  r = command (NULL, &err, str_swaplabel, "-U", uuid, device,
NULL);
-  if (r == -1) {
-    reply_with_error ("%s", err);
-    return -1;
-  }
-
-  return 0;
-}
-
 int
 do_set_uuid (const char *device, const char *uuid)
 {
@@ -88,7 +72,7 @@ do_set_uuid (const char *device, const char *uuid)
     r = xfsuuid (device, uuid);
 
   else if (STREQ (vfs_type, "swap"))
-    r = swapuuid (device, uuid);
+    r = swap_set_uuid (device, uuid);
 
   else if (STREQ (vfs_type, "btrfs"))
     r = btrfs_set_uuid (device, uuid);
-- 
2.1.0

Chen, Hanxiao

2015-Jun-26 09:34 UTC

head link

Re: [Libguestfs] [PATCH v3 0/4] uuid: add btrfs uuid change support and some rework

Hi,

I found some typos in this series.

I'll resend v3.1 soon with set_uuid_random feature.

Please ignore this series.

Regards,
- Chen
> -----Original Message-----
> From: libguestfs-bounces@redhat.com [mailto:libguestfs-bounces@redhat.com]
On
> Behalf Of Chen Hanxiao
> Sent: Friday, June 26, 2015 3:01 PM
> To: libguestfs@redhat.com
> Subject: [Libguestfs] [PATCH v3 0/4] uuid: add btrfs uuid change support
and some
> rework
> 
> - Btrfs-progs v4.1 introduced new feature of changing
>   uuid of btrfs partition.
>   This patch add support of this.
> 
> - uuids.c did a lot of deplicated work for changing uuid
>   of fs. Use existing functions.
> 
> v3: set errno if feature is not available.
> 
> Chen Hanxiao (4):
>   uuid: add support to change uuid of btrfs partition
>   uuid: use existing function of ext2
>   uuid: use newly introduced xfs_set_uuid of xfs
>   uuid: use newly introduced swap_set_uuid
> 
>  daemon/btrfs.c                 | 60
++++++++++++++++++++++++++++++++++++++++++
>  daemon/daemon.h                |  5 ++++
>  daemon/swap.c                  | 16 +++++++++++
>  daemon/uuids.c                 | 48 ++++-----------------------------
>  daemon/xfs.c                   |  7 +++++
>  tests/btrfs/test-btrfs-misc.pl | 17 ++++++++++++
>  6 files changed, 110 insertions(+), 43 deletions(-)
> 
> --
> 2.1.0
> 
> _______________________________________________
> Libguestfs mailing list
> Libguestfs@redhat.com
> https://www.redhat.com/mailman/listinfo/libguestfs

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