aboutsummaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
authorMarkus Armbruster <armbru@redhat.com>2012-07-10 11:12:28 +0200
committerKevin Wolf <kwolf@redhat.com>2012-07-17 16:48:30 +0200
commitf91cbefe2d0eb3f7b5071bcb1fd3a02970f1a776 (patch)
tree594406d70071e882dc5b273148a727bd5d206a07 /block
parent61a8d649ff1e125966b51d688ff43dc6ef6ca63b (diff)
downloadqemu-f91cbefe2d0eb3f7b5071bcb1fd3a02970f1a776.zip
qemu-f91cbefe2d0eb3f7b5071bcb1fd3a02970f1a776.tar.gz
qemu-f91cbefe2d0eb3f7b5071bcb1fd3a02970f1a776.tar.bz2
vvfat: Fix partition table
Unless parameter ":floppy:" is given, vvfat creates a virtual image with DOS MBR defining a single partition which holds the FAT file system. The size of the virtual image depends on the width of the FAT: 32 MiB (CHS 64, 16, 63) for 12 bit FAT, 504 MiB (CHS 1024, 16, 63) for 16 and 32 bit FAT, leaving (64*16-1)*63 = 64449 and (1024*16-1)*64 = 1032129 sectors for the partition. However, it screws up the end of the partition in the MBR: FAT width param. start CHS end CHS start LBA size :32: 0,1,1 1023,14,63 63 1032065 :16: 0,1,1 1023,14,55 63 1032057 :12: 0,1,1 63,14,55 63 64377 The actual FAT file system nevertheless assumes the partition has 1032129 or 64449 sectors. Oops. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/vvfat.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/block/vvfat.c b/block/vvfat.c
index 0fd3367..e2b83a2 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -394,11 +394,12 @@ static void init_mbr(BDRVVVFATState* s)
/* LBA is used when partition is outside the CHS geometry */
lba = sector2CHS(s->bs, &partition->start_CHS, s->first_sectors_number-1);
- lba|= sector2CHS(s->bs, &partition->end_CHS, s->sector_count);
+ lba |= sector2CHS(s->bs, &partition->end_CHS, s->bs->total_sectors - 1);
/*LBA partitions are identified only by start/length_sector_long not by CHS*/
- partition->start_sector_long =cpu_to_le32(s->first_sectors_number-1);
- partition->length_sector_long=cpu_to_le32(s->sector_count - s->first_sectors_number+1);
+ partition->start_sector_long = cpu_to_le32(s->first_sectors_number - 1);
+ partition->length_sector_long = cpu_to_le32(s->bs->total_sectors
+ - s->first_sectors_number + 1);
/* FAT12/FAT16/FAT32 */
/* DOS uses different types when partition is LBA,