summaryrefslogtreecommitdiff
path: root/linux/dev/glue/block.c
diff options
context:
space:
mode:
Diffstat (limited to 'linux/dev/glue/block.c')
-rw-r--r--linux/dev/glue/block.c41
1 files changed, 27 insertions, 14 deletions
diff --git a/linux/dev/glue/block.c b/linux/dev/glue/block.c
index c450ea4..5ca4456 100644
--- a/linux/dev/glue/block.c
+++ b/linux/dev/glue/block.c
@@ -531,7 +531,9 @@ rdwr_partial (int rw, kdev_t dev, loff_t *off,
for (gd = gendisk_head, nsect = -1; gd; gd = gd->next)
if (gd->major == MAJOR (dev))
{
- nsect = gd->part[MINOR (dev)].nr_sects;
+ unsigned mask = (1 << gd->minor_shift) - 1;
+
+ nsect = gd->part[MINOR (dev) & mask].nr_sects;
break;
}
if (nsect > 0)
@@ -935,7 +937,8 @@ init_partition (struct name_map *np, kdev_t *dev,
struct gendisk *gd = ds->gd;
struct partition *p;
struct temp_data *d = current_thread ()->pcb->data;
-
+ unsigned mask = (1 << gd->minor_shift) - 1;
+
if (! gd)
{
*part = -1;
@@ -951,9 +954,12 @@ init_partition (struct name_map *np, kdev_t *dev,
sizeof (struct disklabel *) * gd->max_nr * gd->max_p);
for (i = 1; i < gd->max_p; i++)
{
+ unsigned part;
+
d->inode.i_rdev = *dev | i;
- if (gd->part[MINOR (d->inode.i_rdev)].nr_sects <= 0
- || gd->part[MINOR (d->inode.i_rdev)].start_sect < 0)
+ part = MINOR (d->inode.i_rdev) & mask;
+ if (gd->part[part].nr_sects <= 0
+ || gd->part[part].start_sect < 0)
continue;
linux_intr_pri = SPL5;
d->file.f_flags = 0;
@@ -975,11 +981,11 @@ init_partition (struct name_map *np, kdev_t *dev,
continue;
/* Sanity check. */
- if (p->p_size > gd->part[MINOR (d->inode.i_rdev)].nr_sects)
- p->p_size = gd->part[MINOR (d->inode.i_rdev)].nr_sects;
+ if (p->p_size > gd->part[part].nr_sects)
+ p->p_size = gd->part[part].nr_sects;
}
}
- ds->labels[MINOR (d->inode.i_rdev)] = lp;
+ ds->labels[part] = lp;
}
check:
@@ -989,8 +995,8 @@ check:
return D_NO_SUCH_DEVICE;
*dev = MKDEV (MAJOR (*dev), MINOR (*dev) | slice);
if (slice >= gd->max_p
- || gd->part[MINOR (*dev)].start_sect < 0
- || gd->part[MINOR (*dev)].nr_sects <= 0)
+ || gd->part[MINOR (*dev) & mask].start_sect < 0
+ || gd->part[MINOR (*dev) & mask].nr_sects <= 0)
return D_NO_SUCH_DEVICE;
if (*part >= 0)
{
@@ -1264,7 +1270,8 @@ check_limit (struct block_data *bd, loff_t *off, long bn, int count)
int major, minor;
long maxsz, sz;
struct disklabel *lp = NULL;
-
+ unsigned mask;
+
if (count <= 0)
return count;
@@ -1273,6 +1280,8 @@ check_limit (struct block_data *bd, loff_t *off, long bn, int count)
if (bd->ds->gd)
{
+ mask = (1 << bd->ds->gd->minor_shift) - 1;
+
if (bd->part >= 0)
{
assert (bd->ds->labels);
@@ -1281,7 +1290,7 @@ check_limit (struct block_data *bd, loff_t *off, long bn, int count)
maxsz = lp->d_partitions[bd->part].p_size;
}
else
- maxsz = bd->ds->gd->part[minor].nr_sects;
+ maxsz = bd->ds->gd->part[minor & mask].nr_sects;
}
else
{
@@ -1296,7 +1305,7 @@ check_limit (struct block_data *bd, loff_t *off, long bn, int count)
count = sz << 9;
if (lp)
bn += (lp->d_partitions[bd->part].p_offset
- - bd->ds->gd->part[minor].start_sect);
+ - bd->ds->gd->part[minor & mask].start_sect);
*off = (loff_t) bn << 9;
bd->iocount++;
return count;
@@ -1610,8 +1619,12 @@ device_get_status (void *d, dev_flavor_t flavor, dev_status_t status,
= lp->d_partitions[bd->part].p_size << 9);
}
else
- (status[DEV_GET_SIZE_DEVICE_SIZE]
- = bd->ds->gd->part[MINOR (bd->dev)].nr_sects << 9);
+ {
+ unsigned mask = (1 << bd->ds->gd->minor_shift) - 1;
+
+ (status[DEV_GET_SIZE_DEVICE_SIZE]
+ = bd->ds->gd->part[MINOR (bd->dev) & mask].nr_sects << 9);
+ }
}
else
{