[Qemu-devel] [PATCH 4/6] vvfat: unify and correct computation of sector count

[Paolo Bonzini <pbonzini@redhat.com>]

The sector count is stored in the partition and hence must not include the
sectors before its start.  At the same time, remove the useless special
casing for 1.44 MB floppies.  This fixes fsck on VVFAT hard disks,
which otherwise tries to seek past the end of the disk.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block/vvfat.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/block/vvfat.c b/block/vvfat.c
index eb91642..a682eae 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1040,8 +1040,6 @@ DLOG(if (stderr == NULL) {
 	bs->cyls = 80; bs->heads = 2; bs->secs = 36;
     }
 
-    s->sector_count=bs->cyls*bs->heads*bs->secs;
-
     if (strstr(dirname, ":32:")) {
 	fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. You are welcome to do so!\n");
 	s->fat_type = 32;
@@ -1049,9 +1047,11 @@ DLOG(if (stderr == NULL) {
 	s->fat_type = 16;
     } else if (strstr(dirname, ":12:")) {
 	s->fat_type = 12;
-	s->sector_count=2880;
+	bs->secs = 18;
     }
 
+    s->sector_count=bs->cyls*bs->heads*bs->secs-(s->first_sectors_number-1);
+
     if (strstr(dirname, ":rw:")) {
 	if (enable_write_target(s))
 	    return -1;
-- 
1.7.6