94 lines
3.2 KiB
Diff
94 lines
3.2 KiB
Diff
From fb99ba5ebd0dc34204fc9f1014131d5d494805bc Mon Sep 17 00:00:00 2001
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From: Phillip Susi <psusi@ubuntu.com>
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Date: Sat, 5 Jan 2013 22:59:35 -0500
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Subject: [PATCH 61/89] Revert "linux-commit: do not unnecessarily open
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partition device nodes"
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This reverts commit 2a6936fab4d4499a4b812dd330d3db50549029e0. The commit
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disabled flushing the block buffer caches on the partition nodes to ensure
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cache consistency on 2.6 kernels, supposedly because this was no longer
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required. It appears this was incorrect, and the caches DO still need
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flushed, otherwise a new fs written to the partition device does not show
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up in the disk device cache, causing parted to still identify the old fs.
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---
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NEWS | 5 +++++
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libparted/arch/linux.c | 25 +++----------------------
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2 files changed, 8 insertions(+), 22 deletions(-)
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diff --git a/NEWS b/NEWS
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index a05be02..6538c96 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -10,6 +10,11 @@ GNU parted NEWS -*- outline -*-
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** Bug Fixes
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+ Fix cache coherency issue by flushing partition block devices.
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+ This had been mistakenly disabled in parted 2.0, and resulted
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+ in parted sometimes identifying the previous filesystem type
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+ after running an mkfs to format a partition to a new type.
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+
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libparted: fix gpt end of disk handling. Previously if the backup
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copy of the gpt was not at the end of the disk and you chose to
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ignore this error, parted would move it to the end of the disk
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diff --git a/libparted/arch/linux.c b/libparted/arch/linux.c
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index 05794d9..4b1b438 100644
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--- a/libparted/arch/linux.c
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+++ b/libparted/arch/linux.c
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@@ -703,19 +703,6 @@ _get_linux_version ()
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return kver = KERNEL_VERSION (major, minor, teeny);
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}
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-static int
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-_have_kern26 ()
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-{
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- static int have_kern26 = -1;
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- int kver;
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-
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- if (have_kern26 != -1)
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- return have_kern26;
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-
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- kver = _get_linux_version();
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- return have_kern26 = kver >= KERNEL_VERSION (2,6,0) ? 1 : 0;
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-}
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-
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#if USE_BLKID
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static void
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get_blkid_topology (LinuxSpecific *arch_specific)
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@@ -1567,8 +1554,8 @@ linux_is_busy (PedDevice* dev)
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return 0;
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}
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-/* we need to flush the master device, and with kernel < 2.6 all the partition
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- * devices, because there is no coherency between the caches with old kernels.
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+/* we need to flush the master device, and all the partition devices,
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+ * because there is no coherency between the caches.
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* We should only flush unmounted partition devices, because:
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* - there is never a need to flush them (we're not doing IO there)
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* - flushing a device that is mounted causes unnecessary IO, and can
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@@ -1586,10 +1573,6 @@ _flush_cache (PedDevice* dev)
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ioctl (arch_specific->fd, BLKFLSBUF);
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- /* With linux-2.6.0 and newer, we're done. */
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- if (_have_kern26())
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- return;
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-
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for (i = 1; i < 16; i++) {
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char* name;
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int fd;
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@@ -1654,9 +1637,7 @@ retry:
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dev->read_only = 0;
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}
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- /* With kernels < 2.6 flush cache for cache coherence issues */
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- if (!_have_kern26())
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- _flush_cache (dev);
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+ _flush_cache (dev);
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return 1;
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}
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--
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1.8.5.3
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