When writing a GPT partition table, merge all actions into a single commit.

This avoids unnecessary udev events, which in some cases were causing
udevd to trigger a kernel partition table reread, causing the kernel
to get out of sync with drakx.

In order to do so, the libparted bindings are enhanced so that we
manipulate a 'ped_disk' object:
- disk_open() returns such an object
- set_disk_type() is removed
- disk_commit() writes back the partition table and tell the kernel
  about it
  if we fails to write the partition table, we let
  partition_table::write() fire an exceptionc
  if we only have succeed in writing the partition table, we let
  partition_table::write() try harder (umounting partitions before
  trying againt to tell the kernel again)
- need_to_tell_kernel() is overrided

The last change is needed because we now tell the kernel about the new
partition layout in partition_table::gpt::write() when calling
disk_commit() while previously we were deferring that to
partition_table::write() which after having called the gpt's write()
calls tell_kernel() -> c::tell_kernel_to_reread_partition_table()

So we must tell partition_table::write() that telling the kernel to
reread the partition_table is not needed if we already succeeded in
that.

1 files changed, 60 insertions, 72 deletions

diff --git a/perl-install/c/stuff.xs.pl b/perl-install/c/stuff.xs.pl
index e255b570f..1a148b497 100755
--- a/perl-install/c/stuff.xs.pl
+++ b/perl-install/c/stuff.xs.pl
@@ -610,25 +610,23 @@ get_iso_volume_ids(int fd)
 
 print '
 
+TYPEMAP: <<HERE
+PedDisk*              T_PTROBJ
+HERE
+
+
+
 int
-set_partition_flag(char * device_path, int part_number, char *type)
+set_partition_flag(PedDisk *disk, int part_number, char * type)
   CODE:
-  PedDevice *dev = ped_device_get(device_path);
   RETVAL = 0;
-  if(dev) {
-    PedDisk* disk = ped_disk_new(dev);
-    if(disk) {
-      PedPartition* part = ped_disk_get_partition(disk, part_number);
-      if (!part) {
-        printf("set_partition_flag: failed to find partition\n");
-      } else {
-        PedPartitionFlag flag = string_to_pedpartflag(type);
-	if (flag)
-	   RETVAL=ped_partition_set_flag(part, flag, 1);
-	   if (RETVAL)
-	      RETVAL = ped_disk_commit_to_dev(disk);
-      }
-      ped_disk_destroy(disk);
+  PedPartition* part = ped_disk_get_partition(disk, part_number);
+  if (!part) {
+    printf("set_partition_flag: failed to find partition\n");
+  } else {
+    PedPartitionFlag flag = string_to_pedpartflag(type);
+    if (flag) {
+      RETVAL = ped_partition_set_flag(part, flag, 1);
     }
   }
   OUTPUT:
@@ -700,91 +698,81 @@ get_disk_partitions(char * device_path)
     ped_disk_destroy(disk);
   }
 
-int
-set_disk_type(char * device_path, const char * type_name)
+PedDisk*
+disk_open(char * device_path, const char * type_name = NULL)
   CODE:
   PedDevice *dev = ped_device_get(device_path);
-  RETVAL = 0;
+  RETVAL = NULL;
   if(dev) {
-    PedDiskType* type = ped_disk_type_get(type_name);
-    if(type) {
-      PedDisk* disk = ped_disk_new_fresh(dev, type);
-      if(disk) {
-        RETVAL = ped_disk_commit(disk);
-        ped_disk_destroy(disk);
+    if(type_name) {
+      PedDiskType* type = ped_disk_type_get(type_name);
+      if(type) {
+        RETVAL = ped_disk_new_fresh(dev, type);
       }
+    } else {
+      RETVAL = ped_disk_new(dev);
     }
   }
   OUTPUT:
   RETVAL
 
 int
-disk_delete_all(char * device_path)
+disk_delete_all(PedDisk* disk)
   CODE:
-  PedDevice *dev = ped_device_get(device_path);
   RETVAL = 0;
-  if(dev) {
-    PedDisk* disk = ped_disk_new(dev);
-    if(disk) { 
-      RETVAL = ped_disk_delete_all(disk);
-      if(RETVAL)
-        RETVAL = ped_disk_commit(disk);
-      ped_disk_destroy(disk);
-    }
+  if (ped_disk_delete_all(disk)) {
+    RETVAL = 1;
   }
   OUTPUT:
   RETVAL
 
 int
-disk_del_partition(char * device_path, int part_number)
+disk_del_partition(PedDisk* disk, int part_number)
   CODE:
-  PedDevice *dev = ped_device_get(device_path);
   RETVAL = 0;
-  if(dev) {
-    PedDisk* disk = ped_disk_new(dev);
-    if(disk) {
-      PedPartition* part = ped_disk_get_partition(disk, part_number);
-      if(!part) {
-        printf("disk_del_partition: failed to find partition\n");
-      } else {
-        RETVAL=ped_disk_delete_partition(disk, part);
-        if(RETVAL) {
-          RETVAL = ped_disk_commit_to_dev(disk);
-        } else {
-          printf("del_partition failed\n");
-        }
-      }
-      ped_disk_destroy(disk);
-    }
+  PedPartition* part = ped_disk_get_partition(disk, part_number);
+  if(!part) {
+    printf("disk_del_partition: failed to find partition\n");
+  } else {
+    RETVAL = ped_disk_delete_partition(disk, part);
   }
   OUTPUT:
   RETVAL
 
 int
-disk_add_partition(char * device_path, double start, double length, const char * fs_type)
+disk_add_partition(PedDisk* disk, double start, double length, const char * fs_type)
   CODE:
-  PedDevice *dev = ped_device_get(device_path);
   RETVAL=0;
-  if(dev) {
-    PedDisk* disk = ped_disk_new(dev);
-    if(disk) {
-      PedGeometry* geom = ped_geometry_new(dev, (long long)start, (long long)length);
-      PedPartition* part = ped_partition_new (disk, PED_PARTITION_NORMAL, ped_file_system_type_get(fs_type), (long long)start, (long long)start+length-1);
-      PedConstraint* constraint = ped_constraint_new_from_max(geom);
-      if(!part) {
-        printf("ped_partition_new failed\n");
-      } else
-        RETVAL = ped_disk_add_partition (disk, part, constraint);
-      if(RETVAL) {
-        RETVAL = ped_disk_commit_to_dev(disk);
-      } else {
-        printf("add_partition failed\n");
+  PedGeometry* geom = ped_geometry_new(disk->dev, (long long)start, (long long)length);
+  PedPartition* part = ped_partition_new (disk, PED_PARTITION_NORMAL, ped_file_system_type_get(fs_type), (long long)start, (long long)start+length-1);
+  PedConstraint* constraint = ped_constraint_new_from_max(geom);
+  if(!part) {
+    printf("ped_partition_new failed\n");
+  } else {
+    RETVAL = ped_disk_add_partition (disk, part, constraint);
+  }
+  ped_geometry_destroy(geom);
+  ped_constraint_destroy(constraint);
+  OUTPUT:
+  RETVAL
+
+int
+disk_commit(PedDisk *disk)
+  CODE:
+  RETVAL = 0;
+  /* As done in ped_disk_commit(), open the device here, so that the underlying
+     file descriptor is not closed between the call to ped_disk_commit_to_dev()
+     and the call to ped_disk_commit_to_os(). This avoids unwanted udev events. */
+  if (ped_device_open(disk->dev)) {
+    if (ped_disk_commit_to_dev(disk)) {
+      RETVAL = 1;
+      if (ped_disk_commit_to_os(disk)) {
+        RETVAL = 2;
       }
-      ped_geometry_destroy(geom);
-      ped_constraint_destroy(constraint);
-      ped_disk_destroy(disk);
     }
+    ped_device_close(disk->dev);
   }
+  ped_disk_destroy(disk);
   OUTPUT:
   RETVAL