Commit f93af2a4 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe

block: cleanup __alloc_disk_node

Use early returns and goto-based unwinding to simplify the flow a bit.
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e5c7fb40
......@@ -1729,45 +1729,48 @@ struct gendisk *__alloc_disk_node(int minors, int node_id)
}
disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id);
if (disk) {
disk->part0.dkstats = alloc_percpu(struct disk_stats);
if (!disk->part0.dkstats) {
kfree(disk);
return NULL;
}
init_rwsem(&disk->lookup_sem);
disk->node_id = node_id;
if (disk_expand_part_tbl(disk, 0)) {
free_percpu(disk->part0.dkstats);
kfree(disk);
return NULL;
}
ptbl = rcu_dereference_protected(disk->part_tbl, 1);
rcu_assign_pointer(ptbl->part[0], &disk->part0);
if (!disk)
return NULL;
/*
* set_capacity() and get_capacity() currently don't use
* seqcounter to read/update the part0->nr_sects. Still init
* the counter as we can read the sectors in IO submission
* patch using seqence counters.
*
* TODO: Ideally set_capacity() and get_capacity() should be
* converted to make use of bd_mutex and sequence counters.
*/
hd_sects_seq_init(&disk->part0);
if (hd_ref_init(&disk->part0)) {
hd_free_part(&disk->part0);
kfree(disk);
return NULL;
}
disk->part0.dkstats = alloc_percpu(struct disk_stats);
if (!disk->part0.dkstats)
goto out_free_disk;
disk->minors = minors;
rand_initialize_disk(disk);
disk_to_dev(disk)->class = &block_class;
disk_to_dev(disk)->type = &disk_type;
device_initialize(disk_to_dev(disk));
init_rwsem(&disk->lookup_sem);
disk->node_id = node_id;
if (disk_expand_part_tbl(disk, 0)) {
free_percpu(disk->part0.dkstats);
goto out_free_disk;
}
ptbl = rcu_dereference_protected(disk->part_tbl, 1);
rcu_assign_pointer(ptbl->part[0], &disk->part0);
/*
* set_capacity() and get_capacity() currently don't use
* seqcounter to read/update the part0->nr_sects. Still init
* the counter as we can read the sectors in IO submission
* patch using seqence counters.
*
* TODO: Ideally set_capacity() and get_capacity() should be
* converted to make use of bd_mutex and sequence counters.
*/
hd_sects_seq_init(&disk->part0);
if (hd_ref_init(&disk->part0))
goto out_free_part0;
disk->minors = minors;
rand_initialize_disk(disk);
disk_to_dev(disk)->class = &block_class;
disk_to_dev(disk)->type = &disk_type;
device_initialize(disk_to_dev(disk));
return disk;
out_free_part0:
hd_free_part(&disk->part0);
out_free_disk:
kfree(disk);
return NULL;
}
EXPORT_SYMBOL(__alloc_disk_node);
......
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