diff options
Diffstat (limited to 'linux/dev/glue/block.c')
| -rw-r--r-- | linux/dev/glue/block.c | 41 |
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 { |