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buf: safeguard hash_fn

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This commit is contained in:
Thomas Schoebel-Theuer 2021-03-01 12:08:04 +01:00
parent faa2c9e259
commit 6b64dbb8cd
1 changed files with 5 additions and 4 deletions
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9
kernel/mars_buf.c
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@ -58,10 +58,11 @@
///////////////////////// own helper functions ////////////////////////
static inline
int buf_hash_fn(loff_t base_index)
unsigned int buf_hash_fn(loff_t base_index)
{
// simple and stupid
loff_t tmp;
unsigned long long tmp;
tmp = base_index ^ (base_index / MARS_BUF_HASH_MAX);
//tmp ^= tmp / (MARS_BUF_HASH_MAX * MARS_BUF_HASH_MAX);
return ((unsigned)tmp) % MARS_BUF_HASH_MAX;
@ -72,7 +73,7 @@ static
struct buf_head *_hash_find_insert(struct buf_brick *brick, loff_t base_index, struct buf_head *new)
{
int hash = buf_hash_fn(base_index);
unsigned int hash = buf_hash_fn(base_index);
spinlock_t *lock = &brick->cache_anchors[hash].hash_lock;
struct list_head *start = &brick->cache_anchors[hash].hash_anchor;
struct list_head *tmp;
@ -131,7 +132,7 @@ struct buf_head *_hash_find_insert(struct buf_brick *brick, loff_t base_index, s
static inline
bool _remove_hash(struct buf_brick *brick, struct buf_head *bf)
{
int hash;
unsigned int hash;
spinlock_t *lock;
unsigned long flags;
bool success = false;