108 lines
3.0 KiB
Diff
108 lines
3.0 KiB
Diff
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From 9f4d2b7c87f99f1dec592111a6a6d267949a2c33 Mon Sep 17 00:00:00 2001
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From: Phillip Susi <psusi@ubuntu.com>
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Date: Fri, 2 May 2014 21:50:43 -0400
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Subject: [PATCH 200/208] libparted: don't detect fat and ntfs boot sectors as
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dos MBR
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fat and ntfs boot sectors are very similar to an MBR so if you had one of
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these filesystems on an unpartitioned disk, parted detected them as a dos
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partition table. Have the dos label code call the fat and ntfs filesystem
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probes and if they recognize the sector ( their tests are more stringent )
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then don't claim it as a dos label.
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---
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NEWS | 3 +++
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libparted/fs/ntfs/ntfs.c | 2 +-
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libparted/labels/dos.c | 29 +++++++++++++++++++++++++++++
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3 files changed, 33 insertions(+), 1 deletion(-)
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diff --git a/NEWS b/NEWS
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index ae65106..0c3bad5 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -25,6 +25,9 @@ GNU parted NEWS -*- outline -*-
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Fix filesystem detection on non 512 byte sector sizes
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+ libparted: fat and ntfs boot sectors were misdetected as dos
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+ partition tables instead of being treated as a loop label.
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+
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Fix linux partition sync code to flush partitions > 16
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Do not reject a FAT boot sector as invalid because it has no
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diff --git a/libparted/fs/ntfs/ntfs.c b/libparted/fs/ntfs/ntfs.c
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index 3ba2683..4c154fd 100644
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--- a/libparted/fs/ntfs/ntfs.c
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+++ b/libparted/fs/ntfs/ntfs.c
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@@ -32,7 +32,7 @@
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#define NTFS_SIGNATURE "NTFS"
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-static PedGeometry*
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+PedGeometry*
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ntfs_probe (PedGeometry* geom)
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{
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char *buf = alloca (geom->dev->sector_size);
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diff --git a/libparted/labels/dos.c b/libparted/labels/dos.c
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index eff1c03..295fcf3 100644
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--- a/libparted/labels/dos.c
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+++ b/libparted/labels/dos.c
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@@ -235,12 +235,23 @@ maybe_FAT (unsigned char const *s)
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return true;
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}
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+PedGeometry*
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+fat_probe_fat16 (PedGeometry* geom);
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+
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+PedGeometry*
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+fat_probe_fat32 (PedGeometry* geom);
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+
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+PedGeometry*
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+ntfs_probe (PedGeometry* geom);
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+
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static int
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msdos_probe (const PedDevice *dev)
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{
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PedDiskType* disk_type;
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DosRawTable* part_table;
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int i;
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+ PedGeometry *geom = NULL;
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+ PedGeometry *fsgeom = NULL;
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PED_ASSERT (dev != NULL);
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@@ -257,6 +268,20 @@ msdos_probe (const PedDevice *dev)
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if (PED_LE16_TO_CPU (part_table->magic) != MSDOS_MAGIC)
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goto probe_fail;
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+ geom = ped_geometry_new (dev, 0, dev->length);
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+ PED_ASSERT (geom);
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+ fsgeom = fat_probe_fat16 (geom);
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+ if (fsgeom)
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+ goto probe_fail; /* fat fs looks like dos mbr */
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+ fsgeom = fat_probe_fat32 (geom);
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+ if (fsgeom)
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+ goto probe_fail; /* fat fs looks like dos mbr */
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+ fsgeom = ntfs_probe (geom);
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+ if (fsgeom)
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+ goto probe_fail; /* ntfs fs looks like dos mbr */
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+ ped_geometry_destroy (geom);
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+ geom = NULL;
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+
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/* If this is a FAT fs, fail here. Checking for the FAT signature
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* has some false positives; instead, do what the Linux kernel does
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* and ensure that each partition has a boot indicator that is
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@@ -303,6 +328,10 @@ msdos_probe (const PedDevice *dev)
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return 1;
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probe_fail:
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+ if (geom)
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+ ped_geometry_destroy (geom);
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+ if (fsgeom)
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+ ped_geometry_destroy (fsgeom);
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free (label);
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return 0;
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}
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--
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1.9.0
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