block/iscsi: fix rounding in iscsi_allocationmap_set
when setting clusters as alloacted the boundaries have
to be expanded. As Paolo pointed out the calculation of
the number of clusters is wrong:
Suppose cluster_sectors is 2, sector_num = 1, nb_sectors = 6:
In the "mark allocated" case, you want to set 0..8, i.e.
cluster_num=0, nb_clusters=4.
0--.--2--.--4--.--6--.--8
<--|_________________|--> (<--> = expanded)
Instead you are setting nb_clusters=3, so that 6..8 is not marked.
0--.--2--.--4--.--6--.--8
<--|______________|!!! (! = wrong)
Cc: qemu-stable@nongnu.org
Reported-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <1468831940-15556-2-git-send-email-pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit eb36b953e0
)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-2.6
parent
b6ece2c6f3
commit
5634eb8ffb
|
@ -425,12 +425,14 @@ static unsigned long *iscsi_allocationmap_init(IscsiLun *iscsilun)
|
|||
static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num,
|
||||
int nb_sectors)
|
||||
{
|
||||
int64_t cluster_num, nb_clusters;
|
||||
if (iscsilun->allocationmap == NULL) {
|
||||
return;
|
||||
}
|
||||
bitmap_set(iscsilun->allocationmap,
|
||||
sector_num / iscsilun->cluster_sectors,
|
||||
DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors));
|
||||
cluster_num = sector_num / iscsilun->cluster_sectors;
|
||||
nb_clusters = DIV_ROUND_UP(sector_num + nb_sectors,
|
||||
iscsilun->cluster_sectors) - cluster_num;
|
||||
bitmap_set(iscsilun->allocationmap, cluster_num, nb_clusters);
|
||||
}
|
||||
|
||||
static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num,
|
||||
|
|
Loading…
Reference in New Issue