diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/partitions/check.c | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/fs/partitions/check.c b/fs/partitions/check.c index f517869e8d10..772b2ed8d239 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; |