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Diffstat (limited to 'fs/partitions')
-rw-r--r--fs/partitions/check.c31
1 files changed, 26 insertions, 5 deletions
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index f517869e8d1..772b2ed8d23 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -312,14 +312,18 @@ static void delete_partition_rcu_cb(struct rcu_head *head)
void delete_partition(struct gendisk *disk, int partno)
{
+ struct disk_part_tbl *ptbl = disk->part_tbl;
struct hd_struct *part;
- part = disk->__part[partno];
+ if (partno >= ptbl->len)
+ return;
+
+ part = ptbl->part[partno];
if (!part)
return;
blk_free_devt(part_devt(part));
- rcu_assign_pointer(disk->__part[partno], NULL);
+ rcu_assign_pointer(ptbl->part[partno], NULL);
kobject_put(part->holder_dir);
device_del(part_to_dev(part));
@@ -341,10 +345,16 @@ int add_partition(struct gendisk *disk, int partno,
dev_t devt = MKDEV(0, 0);
struct device *ddev = disk_to_dev(disk);
struct device *pdev;
+ struct disk_part_tbl *ptbl;
const char *dname;
int err;
- if (disk->__part[partno])
+ err = disk_expand_part_tbl(disk, partno);
+ if (err)
+ return err;
+ ptbl = disk->part_tbl;
+
+ if (ptbl->part[partno])
return -EBUSY;
p = kzalloc(sizeof(*p), GFP_KERNEL);
@@ -398,7 +408,7 @@ int add_partition(struct gendisk *disk, int partno,
/* everything is up and running, commence */
INIT_RCU_HEAD(&p->rcu_head);
- rcu_assign_pointer(disk->__part[partno], p);
+ rcu_assign_pointer(ptbl->part[partno], p);
/* suppress uevent if the disk supresses it */
if (!ddev->uevent_suppress)
@@ -487,7 +497,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
struct disk_part_iter piter;
struct hd_struct *part;
struct parsed_partitions *state;
- int p, res;
+ int p, highest, res;
if (bdev->bd_part_count)
return -EBUSY;
@@ -511,6 +521,17 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
/* tell userspace that the media / partition table may have changed */
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+ /* Detect the highest partition number and preallocate
+ * disk->part_tbl. This is an optimization and not strictly
+ * necessary.
+ */
+ for (p = 1, highest = 0; p < state->limit; p++)
+ if (state->parts[p].size)
+ highest = p;
+
+ disk_expand_part_tbl(disk, highest);
+
+ /* add partitions */
for (p = 1; p < state->limit; p++) {
sector_t size = state->parts[p].size;
sector_t from = state->parts[p].from;