diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/genhd.c | 40 | ||||
| -rw-r--r-- | block/ioctl.c | 4 |
2 files changed, 25 insertions, 19 deletions
diff --git a/block/genhd.c b/block/genhd.c index 0a2f16bd54b..65b7386c26d 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -54,10 +54,10 @@ struct hd_struct *disk_get_part(struct gendisk *disk, int partno) { struct hd_struct *part; - if (unlikely(partno < 1 || partno > disk_max_parts(disk))) + if (unlikely(partno < 0 || partno >= disk_max_parts(disk))) return NULL; rcu_read_lock(); - part = rcu_dereference(disk->__part[partno - 1]); + part = rcu_dereference(disk->__part[partno]); if (part) get_device(part_to_dev(part)); rcu_read_unlock(); @@ -85,8 +85,10 @@ void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, if (flags & DISK_PITER_REVERSE) piter->idx = disk_max_parts(piter->disk) - 1; - else + else if (flags & DISK_PITER_INCL_PART0) piter->idx = 0; + else + piter->idx = 1; piter->flags = flags; } @@ -114,7 +116,10 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) /* determine iteration parameters */ if (piter->flags & DISK_PITER_REVERSE) { inc = -1; - end = -1; + if (piter->flags & DISK_PITER_INCL_PART0) + end = -1; + else + end = 0; } else { inc = 1; end = disk_max_parts(piter->disk); @@ -177,7 +182,7 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) { int i; - for (i = 0; i < disk_max_parts(disk); i++) { + for (i = 1; i < disk_max_parts(disk); i++) { struct hd_struct *part = rcu_dereference(disk->__part[i]); if (part && part->start_sect <= sector && @@ -669,7 +674,7 @@ static int show_partition(struct seq_file *seqf, void *v) char buf[BDEVNAME_SIZE]; /* Don't show non-partitionable removeable devices or empty devices */ - if (!get_capacity(sgp) || (!disk_max_parts(sgp) && + if (!get_capacity(sgp) || (!disk_partitionable(sgp) && (sgp->flags & GENHD_FL_REMOVABLE))) return 0; if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) @@ -742,7 +747,7 @@ static ssize_t disk_ext_range_show(struct device *dev, { struct gendisk *disk = dev_to_disk(dev); - return sprintf(buf, "%d\n", disk_max_parts(disk) + 1); + return sprintf(buf, "%d\n", disk_max_parts(disk)); } static ssize_t disk_removable_show(struct device *dev, @@ -998,7 +1003,7 @@ dev_t blk_lookup_devt(const char *name, int partno) if (strcmp(dev->bus_id, name)) continue; - if (partno < 0 || partno > disk_max_parts(disk)) + if (partno < 0 || partno >= disk_max_parts(disk)) continue; if (partno == 0) @@ -1045,21 +1050,22 @@ struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id) GFP_KERNEL | __GFP_ZERO, node_id); if (disk) { int tot_minors = minors + ext_minors; + int size = tot_minors * sizeof(struct hd_struct *); if (!init_disk_stats(disk)) { kfree(disk); return NULL; } - if (tot_minors > 1) { - int size = (tot_minors - 1) * sizeof(struct hd_struct *); - disk->__part = kmalloc_node(size, - GFP_KERNEL | __GFP_ZERO, node_id); - if (!disk->__part) { - free_disk_stats(disk); - kfree(disk); - return NULL; - } + + disk->__part = kmalloc_node(size, GFP_KERNEL | __GFP_ZERO, + node_id); + if (!disk->__part) { + free_disk_stats(disk); + kfree(disk); + return NULL; } + disk->__part[0] = &disk->part0; + disk->minors = minors; disk->ext_minors = ext_minors; rand_initialize_disk(disk); diff --git a/block/ioctl.c b/block/ioctl.c index a5f672ad55f..64e7c67a64b 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -30,7 +30,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user if (bdev != bdev->bd_contains) return -EINVAL; partno = p.pno; - if (partno <= 0 || partno > disk_max_parts(disk)) + if (partno <= 0 || partno >= disk_max_parts(disk)) return -EINVAL; switch (a.op) { case BLKPG_ADD_PARTITION: @@ -102,7 +102,7 @@ static int blkdev_reread_part(struct block_device *bdev) struct gendisk *disk = bdev->bd_disk; int res; - if (!disk_max_parts(disk) || bdev != bdev->bd_contains) + if (!disk_partitionable(disk) || bdev != bdev->bd_contains) return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EACCES; |