[PATCH 1/2] split original if-condition code into separate ones

From: Dongbo Cao
Date: Tue Sep 25 2018 - 02:10:14 EST


to make it clearly to debug.

Signed-off-by: Dongbo Cao <cdbdyx@xxxxxxx>
---
drivers/md/bcache/super.c | 81 +++++++++++++++++++++++++++++++--------
1 file changed, 66 insertions(+), 15 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index fa4058e4..0c0f6d8f 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2017,6 +2017,8 @@ static int cache_alloc(struct cache *ca)
size_t free;
size_t btree_buckets;
struct bucket *b;
+ int ret = -ENOMEM;
+ const char *err = NULL;

__module_get(THIS_MODULE);
kobject_init(&ca->kobj, &bch_cache_ktype);
@@ -2034,27 +2036,76 @@ static int cache_alloc(struct cache *ca)
*/
btree_buckets = ca->sb.njournal_buckets ?: 8;
free = roundup_pow_of_two(ca->sb.nbuckets) >> 10;
-
- if (!init_fifo(&ca->free[RESERVE_BTREE], btree_buckets, GFP_KERNEL) ||
- !init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) ||
- !init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL) ||
- !init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL) ||
- !init_fifo(&ca->free_inc, free << 2, GFP_KERNEL) ||
- !init_heap(&ca->heap, free << 3, GFP_KERNEL) ||
- !(ca->buckets = vzalloc(array_size(sizeof(struct bucket),
- ca->sb.nbuckets))) ||
- !(ca->prio_buckets = kzalloc(array3_size(sizeof(uint64_t),
- prio_buckets(ca), 2),
- GFP_KERNEL)) ||
- !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)))
- return -ENOMEM;
+
+ if (!init_fifo(&ca->free[RESERVE_BTREE], btree_buckets,
+ GFP_KERNEL)) {
+ err = "ca->free[RESERVE_BTREE] alloc failed";
+ goto err_btree_alloc;
+ }
+ if (!init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca),
+ GFP_KERNEL)) {
+ err = "ca->free[RESERVE_PRIO] alloc failed";
+ goto err_prio_alloc;
+ }
+ if (!init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL)) {
+ err = "ca->free[RESERVE_MOVINGGC] alloc failed";
+ goto err_movinggc_alloc;
+ }
+ if (!init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL)) {
+ err = "ca->free[RESERVE_NONE] alloc failed";
+ goto err_none_alloc;
+ }
+ if (!init_fifo(&ca->free_inc, free << 2, GFP_KERNEL)) {
+ err = "ca->free_inc alloc failed";
+ goto err_free_inc_alloc;
+ }
+ if (!init_heap(&ca->heap, free << 3, GFP_KERNEL)) {
+ err = "ca->heap alloc failed";
+ goto err_heap_alloc;
+ }
+ if (!(ca->buckets = vzalloc(array_size(sizeof(struct bucket),
+ ca->sb.nbuckets)))) {
+ err = "ca->buckets alloc failed";
+ goto err_buckets_alloc;
+ }
+ if (!(ca->prio_buckets = kzalloc(array3_size(sizeof(uint64_t),
+ prio_buckets(ca), 2),
+ GFP_KERNEL))) {
+ err = "ca->prio_buckets alloc failed";
+ goto err_prio_buckets_alloc;
+ }
+ if (!(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca))) {
+ err = "ca->disk_buckets alloc failed";
+ goto err_disk_buckets_alloc;
+ }

ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca);

for_each_bucket(b, ca)
atomic_set(&b->pin, 0);
-
return 0;
+
+err_disk_buckets_alloc:
+ kfree(ca->prio_buckets);
+err_prio_buckets_alloc:
+ vfree(ca->buckets);
+err_buckets_alloc:
+ free_heap(&ca->heap);
+err_heap_alloc:
+ free_fifo(&ca->free_inc);
+err_free_inc_alloc:
+ free_fifo(&ca->free[RESERVE_NONE]);
+err_none_alloc:
+ free_fifo(&ca->free[RESERVE_MOVINGGC]);
+err_movinggc_alloc:
+ free_fifo(&ca->free[RESERVE_PRIO]);
+err_prio_alloc:
+ free_fifo(&ca->free[RESERVE_BTREE]);
+err_btree_alloc:
+ module_put(THIS_MODULE);
+ if (err)
+ pr_notice("error %s: %s", ca->cache_dev_name, err);
+ return ret;
}

static int register_cache(struct cache_sb *sb, struct page *sb_page,
--
2.17.1