File avoid-unnecessary-open-close.patch of Package parted

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File avoid-unnecessary-open-close.patch of Package parted

From ad25892bb995f61b0ddf801ed1f74e0b1e7390ce Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Thu, 27 Aug 2009 20:16:09 +0200
Subject: [PATCH] parted: avoid unnecessary open/close on commit, and thus udev activity

* libparted/disk.c (ped_disk_commit): Open/close the underlying file
descriptor in this function, so that callees, ped_disk_commit_to_dev
and ped_disk_commit_to_os do not each perform open/close syscalls.
This saves an open/close pair, and thus avoids unneeded udev
activity on Linux.

Before this change, when calling commit() on a ped_disk, the
following would happen:

open /dev/sda
write partition table
close /dev/sda
open /dev/sda
ioctl (BLKRRPART)
close /dev/sda

This is rather inefficient, and causes 2 udev change events to be fired
for /dev/sda (+ the change events from the BLKRRPART), causing all kind
of scanning (blkid & friends) twice.

This patch fixes things to only open the device once.
---
 libparted/disk.c |   20 ++++++++++++++++++--
 1 files changed, 18 insertions(+), 2 deletions(-)

Index: parted-1.9.0/libparted/disk.c
===================================================================
--- parted-1.9.0.orig/libparted/disk.c	2009-12-03 15:09:44.000000000 +0100
+++ parted-1.9.0/libparted/disk.c	2009-12-03 15:10:13.000000000 +0100
@@ -489,9 +489,25 @@ error:
 int
 ped_disk_commit (PedDisk* disk)
 {
+        /* Open the device here, so that the underlying fd is not closed
+           between commit_to_dev and commit_to_os (closing causes unwanted
+           udev events to be sent under Linux). */
+	if (!ped_device_open (disk->dev))
+		goto error;
+
 	if (!ped_disk_commit_to_dev (disk))
+		goto error_close_dev;
+
+	if (!ped_disk_commit_to_os (disk))
+		goto error_close_dev;
+
+	ped_device_close (disk->dev);
+	return 1;
+
+error_close_dev:
+	ped_device_close (disk->dev);
+error:
 		return 0;
-	return ped_disk_commit_to_os (disk);
 }
 
 /**

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File avoid-unnecessary-open-close.patch of Package parted

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