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78 lines
3.3 KiB
78 lines
3.3 KiB
2 years ago
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From 72f50e52515369ef8decda9493422d6235f5b365 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Wed, 18 Aug 2021 11:00:12 +0100
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Subject: [PATCH] v2v: windows: Do not fix NTFS heads in Windows Vista and
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later
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Setting/adjusting the number of drive heads in the NTFS header is only
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necessary for ancient versions of Windows. Modern versions ignore
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this. In addition this operation broke when we added BitLocker
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support. Only do this for ancient Windows 2000/XP and skip it for
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everything else.
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Reported-by: Ming Xie
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Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1994984
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(cherry picked from commit 0a394c5c2f802098c9e481b4bacee7821e5dd0ae)
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---
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v2v/convert_windows.ml | 44 ++++++++++++++++++++++--------------------
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1 file changed, 23 insertions(+), 21 deletions(-)
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diff --git a/v2v/convert_windows.ml b/v2v/convert_windows.ml
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index 33fbd410..13de10cb 100644
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--- a/v2v/convert_windows.ml
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+++ b/v2v/convert_windows.ml
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@@ -730,30 +730,32 @@ if errorlevel 3010 exit /b 0
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however, as this is specific to Windows 2003 it lists location
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0x1A as unused.
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*)
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- let rootpart = inspect.i_root in
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+ if inspect.i_major_version < 6 (* is Windows 2000/XP *) then (
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+ let rootpart = inspect.i_root in
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- (* Ignore if the rootpart is something like /dev/sda. RHBZ#1276540. *)
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- if not (g#is_whole_device rootpart) then (
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- (* Check that the root device contains NTFS magic. *)
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- let magic = g#pread_device rootpart 8 3L in
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- if magic = "NTFS " then (
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- (* Get the size of the whole disk containing the root partition. *)
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- let rootdev = g#part_to_dev rootpart in (* eg. /dev/sda *)
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- let size = g#blockdev_getsize64 rootdev in
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+ (* Ignore if the rootpart is something like /dev/sda. RHBZ#1276540. *)
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+ if not (g#is_whole_device rootpart) then (
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+ (* Check that the root device contains NTFS magic. *)
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+ let magic = g#pread_device rootpart 8 3L in
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+ if magic = "NTFS " then (
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+ (* Get the size of the whole disk containing the root partition. *)
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+ let rootdev = g#part_to_dev rootpart in (* eg. /dev/sda *)
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+ let size = g#blockdev_getsize64 rootdev in
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- let heads = (* refer to the table above *)
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- if size < 2114445312L then 0x40
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- else if size < 4228374780L then 0x80
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- else 0xff in
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+ let heads = (* refer to the table above *)
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+ if size < 2114445312L then 0x40
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+ else if size < 4228374780L then 0x80
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+ else 0xff in
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- (* Update NTFS's idea of the number of heads. This is an
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- * unsigned 16 bit little-endian integer, offset 0x1a from the
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- * beginning of the partition.
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- *)
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- let b = Bytes.create 2 in
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- Bytes.unsafe_set b 0 (Char.chr heads);
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- Bytes.unsafe_set b 1 '\000';
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- ignore (g#pwrite_device rootpart (Bytes.to_string b) 0x1a_L)
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+ (* Update NTFS's idea of the number of heads. This is an
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+ * unsigned 16 bit little-endian integer, offset 0x1a from the
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+ * beginning of the partition.
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+ *)
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+ let b = Bytes.create 2 in
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+ Bytes.unsafe_set b 0 (Char.chr heads);
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+ Bytes.unsafe_set b 1 '\000';
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+ ignore (g#pwrite_device rootpart (Bytes.to_string b) 0x1a_L)
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+ )
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)
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)
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