File 0145-block-raw-posix-Fix-disk-corruption.patch of Package qemu-linux-user.7445

Overview Repositories Revisions Requests Users Attributes Meta

File 0145-block-raw-posix-Fix-disk-corruption.patch of Package qemu-linux-user.7445

From 374b710c58b44728a69d54d8f84bd86a8f63c132 Mon Sep 17 00:00:00 2001
From: Tony Breeds <tony@bakeyournoodle.com>
Date: Fri, 26 Sep 2014 09:14:11 +1000
Subject: [PATCH] block/raw-posix: Fix disk corruption in try_fiemap
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Using fiemap without FIEMAP_FLAG_SYNC is a known corrupter.

Add the FIEMAP_FLAG_SYNC flag to the FS_IOC_FIEMAP ioctl.  This has
the downside of significantly reducing performance.

Reported-By: Michael Steffens <michael_steffens@posteo.de>
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Max Reitz <mreitz@redhat.com>
Cc: Pádraig Brady <pbrady@redhat.com>
Cc: Eric Blake <eblake@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 38c4d0aea3e1264c86e282d99560330adf2b6e25)
[BR: BNC#908380]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 block/raw-posix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/raw-posix.c b/block/raw-posix.c
index eb947557e6..93f2bc4821 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1310,7 +1310,7 @@ static int64_t try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
 
     f.fm.fm_start = start;
     f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;
-    f.fm.fm_flags = 0;
+    f.fm.fm_flags = FIEMAP_FLAG_SYNC;
     f.fm.fm_extent_count = 1;
     f.fm.fm_reserved = 0;
     if (ioctl(s->fd, FS_IOC_FIEMAP, &f) == -1) {

Places

File 0145-block-raw-posix-Fix-disk-corruption.patch of Package qemu-linux-user.7445

Places