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authorDavid S. Miller <davem@davemloft.net>2017-02-15 22:29:51 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-15 22:29:51 -0500
commitbf3f14d6342cfb37eab8f0cddd0e4d4063fd9fc9 (patch)
tree2907cdfb8da2c43bf4c599bc3d398274e21dfc91
parent75224c93fa985f4a6fb983f53208f5c5aa555fbf (diff)
downloadlinux-stericsson-bf3f14d6342cfb37eab8f0cddd0e4d4063fd9fc9.tar.gz
rhashtable: Revert nested table changes.
This reverts commits: 6a25478077d987edc5e2f880590a2bc5fcab4441 9dbbfb0ab6680c6a85609041011484e6658e7d3c 40137906c5f55c252194ef5834130383e639536f It's too risky to put in this late in the release cycle. We'll put these changes into the next merge window instead. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--fs/gfs2/glock.c28
-rw-r--r--include/linux/rhashtable.h78
-rw-r--r--lib/rhashtable.c270
-rw-r--r--net/tipc/net.c4
-rw-r--r--net/tipc/socket.c30
5 files changed, 94 insertions, 316 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 70e94170af85..94f50cac91c6 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1420,32 +1420,26 @@ static struct shrinker glock_shrinker = {
* @sdp: the filesystem
* @bucket: the bucket
*
- * Note that the function can be called multiple times on the same
- * object. So the user must ensure that the function can cope with
- * that.
*/
static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
{
struct gfs2_glock *gl;
- struct rhashtable_iter iter;
-
- rhashtable_walk_enter(&gl_hash_table, &iter);
-
- do {
- gl = ERR_PTR(rhashtable_walk_start(&iter));
- if (gl)
- continue;
+ struct rhash_head *pos;
+ const struct bucket_table *tbl;
+ int i;
- while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl))
+ rcu_read_lock();
+ tbl = rht_dereference_rcu(gl_hash_table.tbl, &gl_hash_table);
+ for (i = 0; i < tbl->size; i++) {
+ rht_for_each_entry_rcu(gl, pos, tbl, i, gl_node) {
if ((gl->gl_name.ln_sbd == sdp) &&
lockref_get_not_dead(&gl->gl_lockref))
examiner(gl);
-
- rhashtable_walk_stop(&iter);
- } while (cond_resched(), gl == ERR_PTR(-EAGAIN));
-
- rhashtable_walk_exit(&iter);
+ }
+ }
+ rcu_read_unlock();
+ cond_resched();
}
/**
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h
index f2e12a845910..5c132d3188be 100644
--- a/include/linux/rhashtable.h
+++ b/include/linux/rhashtable.h
@@ -61,7 +61,6 @@ struct rhlist_head {
/**
* struct bucket_table - Table of hash buckets
* @size: Number of hash buckets
- * @nest: Number of bits of first-level nested table.
* @rehash: Current bucket being rehashed
* @hash_rnd: Random seed to fold into hash
* @locks_mask: Mask to apply before accessing locks[]
@@ -69,12 +68,10 @@ struct rhlist_head {
* @walkers: List of active walkers
* @rcu: RCU structure for freeing the table
* @future_tbl: Table under construction during rehashing
- * @ntbl: Nested table used when out of memory.
* @buckets: size * hash buckets
*/
struct bucket_table {
unsigned int size;
- unsigned int nest;
unsigned int rehash;
u32 hash_rnd;
unsigned int locks_mask;
@@ -84,7 +81,7 @@ struct bucket_table {
struct bucket_table __rcu *future_tbl;
- struct rhash_head __rcu *buckets[] ____cacheline_aligned_in_smp;
+ struct rhash_head __rcu *buckets[] ____cacheline_aligned_in_smp;
};
/**
@@ -377,12 +374,6 @@ void rhashtable_free_and_destroy(struct rhashtable *ht,
void *arg);
void rhashtable_destroy(struct rhashtable *ht);
-struct rhash_head __rcu **rht_bucket_nested(const struct bucket_table *tbl,
- unsigned int hash);
-struct rhash_head __rcu **rht_bucket_nested_insert(struct rhashtable *ht,
- struct bucket_table *tbl,
- unsigned int hash);
-
#define rht_dereference(p, ht) \
rcu_dereference_protected(p, lockdep_rht_mutex_is_held(ht))
@@ -398,27 +389,6 @@ struct rhash_head __rcu **rht_bucket_nested_insert(struct rhashtable *ht,
#define rht_entry(tpos, pos, member) \
({ tpos = container_of(pos, typeof(*tpos), member); 1; })
-static inline struct rhash_head __rcu *const *rht_bucket(
- const struct bucket_table *tbl, unsigned int hash)
-{
- return unlikely(tbl->nest) ? rht_bucket_nested(tbl, hash) :
- &tbl->buckets[hash];
-}
-
-static inline struct rhash_head __rcu **rht_bucket_var(
- struct bucket_table *tbl, unsigned int hash)
-{
- return unlikely(tbl->nest) ? rht_bucket_nested(tbl, hash) :
- &tbl->buckets[hash];
-}
-
-static inline struct rhash_head __rcu **rht_bucket_insert(
- struct rhashtable *ht, struct bucket_table *tbl, unsigned int hash)
-{
- return unlikely(tbl->nest) ? rht_bucket_nested_insert(ht, tbl, hash) :
- &tbl->buckets[hash];
-}
-
/**
* rht_for_each_continue - continue iterating over hash chain
* @pos: the &struct rhash_head to use as a loop cursor.
@@ -438,7 +408,7 @@ static inline struct rhash_head __rcu **rht_bucket_insert(
* @hash: the hash value / bucket index
*/
#define rht_for_each(pos, tbl, hash) \
- rht_for_each_continue(pos, *rht_bucket(tbl, hash), tbl, hash)
+ rht_for_each_continue(pos, (tbl)->buckets[hash], tbl, hash)
/**
* rht_for_each_entry_continue - continue iterating over hash chain
@@ -463,7 +433,7 @@ static inline struct rhash_head __rcu **rht_bucket_insert(
* @member: name of the &struct rhash_head within the hashable struct.
*/
#define rht_for_each_entry(tpos, pos, tbl, hash, member) \
- rht_for_each_entry_continue(tpos, pos, *rht_bucket(tbl, hash), \
+ rht_for_each_entry_continue(tpos, pos, (tbl)->buckets[hash], \
tbl, hash, member)
/**
@@ -478,13 +448,13 @@ static inline struct rhash_head __rcu **rht_bucket_insert(
* This hash chain list-traversal primitive allows for the looped code to
* remove the loop cursor from the list.
*/
-#define rht_for_each_entry_safe(tpos, pos, next, tbl, hash, member) \
- for (pos = rht_dereference_bucket(*rht_bucket(tbl, hash), tbl, hash), \
- next = !rht_is_a_nulls(pos) ? \
- rht_dereference_bucket(pos->next, tbl, hash) : NULL; \
- (!rht_is_a_nulls(pos)) && rht_entry(tpos, pos, member); \
- pos = next, \
- next = !rht_is_a_nulls(pos) ? \
+#define rht_for_each_entry_safe(tpos, pos, next, tbl, hash, member) \
+ for (pos = rht_dereference_bucket((tbl)->buckets[hash], tbl, hash), \
+ next = !rht_is_a_nulls(pos) ? \
+ rht_dereference_bucket(pos->next, tbl, hash) : NULL; \
+ (!rht_is_a_nulls(pos)) && rht_entry(tpos, pos, member); \
+ pos = next, \
+ next = !rht_is_a_nulls(pos) ? \
rht_dereference_bucket(pos->next, tbl, hash) : NULL)
/**
@@ -515,7 +485,7 @@ static inline struct rhash_head __rcu **rht_bucket_insert(
* traversal is guarded by rcu_read_lock().
*/
#define rht_for_each_rcu(pos, tbl, hash) \
- rht_for_each_rcu_continue(pos, *rht_bucket(tbl, hash), tbl, hash)
+ rht_for_each_rcu_continue(pos, (tbl)->buckets[hash], tbl, hash)
/**
* rht_for_each_entry_rcu_continue - continue iterating over rcu hash chain
@@ -548,8 +518,8 @@ static inline struct rhash_head __rcu **rht_bucket_insert(
* the _rcu mutation primitives such as rhashtable_insert() as long as the
* traversal is guarded by rcu_read_lock().
*/
-#define rht_for_each_entry_rcu(tpos, pos, tbl, hash, member) \
- rht_for_each_entry_rcu_continue(tpos, pos, *rht_bucket(tbl, hash), \
+#define rht_for_each_entry_rcu(tpos, pos, tbl, hash, member) \
+ rht_for_each_entry_rcu_continue(tpos, pos, (tbl)->buckets[hash],\
tbl, hash, member)
/**
@@ -595,7 +565,7 @@ static inline struct rhash_head *__rhashtable_lookup(
.ht = ht,
.key = key,
};
- struct bucket_table *tbl;
+ const struct bucket_table *tbl;
struct rhash_head *he;
unsigned int hash;
@@ -727,12 +697,8 @@ slow_path:
}
elasticity = ht->elasticity;
- pprev = rht_bucket_insert(ht, tbl, hash);
- data = ERR_PTR(-ENOMEM);
- if (!pprev)
- goto out;
-
- rht_for_each_continue(head, *pprev, tbl, hash) {
+ pprev = &tbl->buckets[hash];
+ rht_for_each(head, tbl, hash) {
struct rhlist_head *plist;
struct rhlist_head *list;
@@ -770,7 +736,7 @@ slow_path:
if (unlikely(rht_grow_above_100(ht, tbl)))
goto slow_path;
- head = rht_dereference_bucket(*pprev, tbl, hash);
+ head = rht_dereference_bucket(tbl->buckets[hash], tbl, hash);
RCU_INIT_POINTER(obj->next, head);
if (rhlist) {
@@ -780,7 +746,7 @@ slow_path:
RCU_INIT_POINTER(list->next, NULL);
}
- rcu_assign_pointer(*pprev, obj);
+ rcu_assign_pointer(tbl->buckets[hash], obj);
atomic_inc(&ht->nelems);
if (rht_grow_above_75(ht, tbl))
@@ -989,8 +955,8 @@ static inline int __rhashtable_remove_fast_one(
spin_lock_bh(lock);
- pprev = rht_bucket_var(tbl, hash);
- rht_for_each_continue(he, *pprev, tbl, hash) {
+ pprev = &tbl->buckets[hash];
+ rht_for_each(he, tbl, hash) {
struct rhlist_head *list;
list = container_of(he, struct rhlist_head, rhead);
@@ -1141,8 +1107,8 @@ static inline int __rhashtable_replace_fast(
spin_lock_bh(lock);
- pprev = rht_bucket_var(tbl, hash);
- rht_for_each_continue(he, *pprev, tbl, hash) {
+ pprev = &tbl->buckets[hash];
+ rht_for_each(he, tbl, hash) {
if (he != obj_old) {
pprev = &he->next;
continue;
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 172454e6b979..32d0ad058380 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -32,11 +32,6 @@
#define HASH_MIN_SIZE 4U
#define BUCKET_LOCKS_PER_CPU 32UL
-union nested_table {
- union nested_table __rcu *table;
- struct rhash_head __rcu *bucket;
-};
-
static u32 head_hashfn(struct rhashtable *ht,
const struct bucket_table *tbl,
const struct rhash_head *he)
@@ -81,9 +76,6 @@ static int alloc_bucket_locks(struct rhashtable *ht, struct bucket_table *tbl,
/* Never allocate more than 0.5 locks per bucket */
size = min_t(unsigned int, size, tbl->size >> 1);
- if (tbl->nest)
- size = min(size, 1U << tbl->nest);
-
if (sizeof(spinlock_t) != 0) {
tbl->locks = NULL;
#ifdef CONFIG_NUMA
@@ -107,45 +99,8 @@ static int alloc_bucket_locks(struct rhashtable *ht, struct bucket_table *tbl,
return 0;
}
-static void nested_table_free(union nested_table *ntbl, unsigned int size)
-{
- const unsigned int shift = PAGE_SHIFT - ilog2(sizeof(void *));
- const unsigned int len = 1 << shift;
- unsigned int i;
-
- ntbl = rcu_dereference_raw(ntbl->table);
- if (!ntbl)
- return;
-
- if (size > len) {
- size >>= shift;
- for (i = 0; i < len; i++)
- nested_table_free(ntbl + i, size);
- }
-
- kfree(ntbl);
-}
-
-static void nested_bucket_table_free(const struct bucket_table *tbl)
-{
- unsigned int size = tbl->size >> tbl->nest;
- unsigned int len = 1 << tbl->nest;
- union nested_table *ntbl;
- unsigned int i;
-
- ntbl = (union nested_table *)rcu_dereference_raw(tbl->buckets[0]);
-
- for (i = 0; i < len; i++)
- nested_table_free(ntbl + i, size);
-
- kfree(ntbl);
-}
-
static void bucket_table_free(const struct bucket_table *tbl)
{
- if (tbl->nest)
- nested_bucket_table_free(tbl);
-
if (tbl)
kvfree(tbl->locks);
@@ -157,59 +112,6 @@ static void bucket_table_free_rcu(struct rcu_head *head)
bucket_table_free(container_of(head, struct bucket_table, rcu));
}
-static union nested_table *nested_table_alloc(struct rhashtable *ht,
- union nested_table __rcu **prev,
- unsigned int shifted,
- unsigned int nhash)
-{
- union nested_table *ntbl;
- int i;
-
- ntbl = rcu_dereference(*prev);
- if (ntbl)
- return ntbl;
-
- ntbl = kzalloc(PAGE_SIZE, GFP_ATOMIC);
-
- if (ntbl && shifted) {
- for (i = 0; i < PAGE_SIZE / sizeof(ntbl[0].bucket); i++)
- INIT_RHT_NULLS_HEAD(ntbl[i].bucket, ht,
- (i << shifted) | nhash);
- }
-
- rcu_assign_pointer(*prev, ntbl);
-
- return ntbl;
-}
-
-static struct bucket_table *nested_bucket_table_alloc(struct rhashtable *ht,
- size_t nbuckets,
- gfp_t gfp)
-{
- const unsigned int shift = PAGE_SHIFT - ilog2(sizeof(void *));
- struct bucket_table *tbl;
- size_t size;
-
- if (nbuckets < (1 << (shift + 1)))
- return NULL;
-
- size = sizeof(*tbl) + sizeof(tbl->buckets[0]);
-
- tbl = kzalloc(size, gfp);
- if (!tbl)
- return NULL;
-
- if (!nested_table_alloc(ht, (union nested_table __rcu **)tbl->buckets,
- 0, 0)) {
- kfree(tbl);
- return NULL;
- }
-
- tbl->nest = (ilog2(nbuckets) - 1) % shift + 1;
-
- return tbl;
-}
-
static struct bucket_table *bucket_table_alloc(struct rhashtable *ht,
size_t nbuckets,
gfp_t gfp)
@@ -224,17 +126,10 @@ static struct bucket_table *bucket_table_alloc(struct rhashtable *ht,
tbl = kzalloc(size, gfp | __GFP_NOWARN | __GFP_NORETRY);
if (tbl == NULL && gfp == GFP_KERNEL)
tbl = vzalloc(size);
-
- size = nbuckets;
-
- if (tbl == NULL && gfp != GFP_KERNEL) {
- tbl = nested_bucket_table_alloc(ht, nbuckets, gfp);
- nbuckets = 0;
- }
if (tbl == NULL)
return NULL;
- tbl->size = size;
+ tbl->size = nbuckets;
if (alloc_bucket_locks(ht, tbl, gfp) < 0) {
bucket_table_free(tbl);
@@ -269,17 +164,12 @@ static int rhashtable_rehash_one(struct rhashtable *ht, unsigned int old_hash)
struct bucket_table *old_tbl = rht_dereference(ht->tbl, ht);
struct bucket_table *new_tbl = rhashtable_last_table(ht,
rht_dereference_rcu(old_tbl->future_tbl, ht));
- struct rhash_head __rcu **pprev = rht_bucket_var(old_tbl, old_hash);
- int err = -EAGAIN;
+ struct rhash_head __rcu **pprev = &old_tbl->buckets[old_hash];
+ int err = -ENOENT;
struct rhash_head *head, *next, *entry;
spinlock_t *new_bucket_lock;
unsigned int new_hash;
- if (new_tbl->nest)
- goto out;
-
- err = -ENOENT;
-
rht_for_each(entry, old_tbl, old_hash) {
err = 0;
next = rht_dereference_bucket(entry->next, old_tbl, old_hash);
@@ -312,26 +202,19 @@ out:
return err;
}
-static int rhashtable_rehash_chain(struct rhashtable *ht,
+static void rhashtable_rehash_chain(struct rhashtable *ht,
unsigned int old_hash)
{
struct bucket_table *old_tbl = rht_dereference(ht->tbl, ht);
spinlock_t *old_bucket_lock;
- int err;
old_bucket_lock = rht_bucket_lock(old_tbl, old_hash);
spin_lock_bh(old_bucket_lock);
- while (!(err = rhashtable_rehash_one(ht, old_hash)))
+ while (!rhashtable_rehash_one(ht, old_hash))
;
-
- if (err == -ENOENT) {
- old_tbl->rehash++;
- err = 0;
- }
+ old_tbl->rehash++;
spin_unlock_bh(old_bucket_lock);
-
- return err;
}
static int rhashtable_rehash_attach(struct rhashtable *ht,
@@ -363,17 +246,13 @@ static int rhashtable_rehash_table(struct rhashtable *ht)
struct bucket_table *new_tbl;
struct rhashtable_walker *walker;
unsigned int old_hash;
- int err;
new_tbl = rht_dereference(old_tbl->future_tbl, ht);
if (!new_tbl)
return 0;
- for (old_hash = 0; old_hash < old_tbl->size; old_hash++) {
- err = rhashtable_rehash_chain(ht, old_hash);
- if (err)
- return err;
- }
+ for (old_hash = 0; old_hash < old_tbl->size; old_hash++)
+ rhashtable_rehash_chain(ht, old_hash);
/* Publish the new table pointer. */
rcu_assign_pointer(ht->tbl, new_tbl);
@@ -392,16 +271,31 @@ static int rhashtable_rehash_table(struct rhashtable *ht)
return rht_dereference(new_tbl->future_tbl, ht) ? -EAGAIN : 0;
}
-static int rhashtable_rehash_alloc(struct rhashtable *ht,
- struct bucket_table *old_tbl,
- unsigned int size)
+/**
+ * rhashtable_expand - Expand hash table while allowing concurrent lookups
+ * @ht: the hash table to expand
+ *
+ * A secondary bucket array is allocated and the hash entries are migrated.
+ *
+ * This function may only be called in a context where it is safe to call
+ * synchronize_rcu(), e.g. not within a rcu_read_lock() section.
+ *
+ * The caller must ensure that no concurrent resizing occurs by holding
+ * ht->mutex.
+ *
+ * It is valid to have concurrent insertions and deletions protected by per
+ * bucket locks or concurrent RCU protected lookups and traversals.
+ */
+static int rhashtable_expand(struct rhashtable *ht)
{
- struct bucket_table *new_tbl;
+ struct bucket_table *new_tbl, *old_tbl = rht_dereference(ht->tbl, ht);
int err;
ASSERT_RHT_MUTEX(ht);
- new_tbl = bucket_table_alloc(ht, size, GFP_KERNEL);
+ old_tbl = rhashtable_last_table(ht, old_tbl);
+
+ new_tbl = bucket_table_alloc(ht, old_tbl->size * 2, GFP_KERNEL);
if (new_tbl == NULL)
return -ENOMEM;
@@ -430,9 +324,12 @@ static int rhashtable_rehash_alloc(struct rhashtable *ht,
*/
static int rhashtable_shrink(struct rhashtable *ht)
{
- struct bucket_table *old_tbl = rht_dereference(ht->tbl, ht);
+ struct bucket_table *new_tbl, *old_tbl = rht_dereference(ht->tbl, ht);
unsigned int nelems = atomic_read(&ht->nelems);
unsigned int size = 0;
+ int err;
+
+ ASSERT_RHT_MUTEX(ht);
if (nelems)
size = roundup_pow_of_two(nelems * 3 / 2);
@@ -445,7 +342,15 @@ static int rhashtable_shrink(struct rhashtable *ht)
if (rht_dereference(old_tbl->future_tbl, ht))
return -EEXIST;
- return rhashtable_rehash_alloc(ht, old_tbl, size);
+ new_tbl = bucket_table_alloc(ht, size, GFP_KERNEL);
+ if (new_tbl == NULL)
+ return -ENOMEM;
+
+ err = rhashtable_rehash_attach(ht, old_tbl, new_tbl);
+ if (err)
+ bucket_table_free(new_tbl);
+
+ return err;
}
static void rht_deferred_worker(struct work_struct *work)
@@ -461,14 +366,11 @@ static void rht_deferred_worker(struct work_struct *work)
tbl = rhashtable_last_table(ht, tbl);
if (rht_grow_above_75(ht, tbl))
- err = rhashtable_rehash_alloc(ht, tbl, tbl->size * 2);
+ rhashtable_expand(ht);
else if (ht->p.automatic_shrinking && rht_shrink_below_30(ht, tbl))
- err = rhashtable_shrink(ht);
- else if (tbl->nest)
- err = rhashtable_rehash_alloc(ht, tbl, tbl->size);
+ rhashtable_shrink(ht);
- if (!err)
- err = rhashtable_rehash_table(ht);
+ err = rhashtable_rehash_table(ht);
mutex_unlock(&ht->mutex);
@@ -537,8 +439,8 @@ static void *rhashtable_lookup_one(struct rhashtable *ht,
int elasticity;
elasticity = ht->elasticity;
- pprev = rht_bucket_var(tbl, hash);
- rht_for_each_continue(head, *pprev, tbl, hash) {
+ pprev = &tbl->buckets[hash];
+ rht_for_each(head, tbl, hash) {
struct rhlist_head *list;
struct rhlist_head *plist;
@@ -575,7 +477,6 @@ static struct bucket_table *rhashtable_insert_one(struct rhashtable *ht,
struct rhash_head *obj,
void *data)
{
- struct rhash_head __rcu **pprev;
struct bucket_table *new_tbl;
struct rhash_head *head;
@@ -598,11 +499,7 @@ static struct bucket_table *rhashtable_insert_one(struct rhashtable *ht,
if (unlikely(rht_grow_above_100(ht, tbl)))
return ERR_PTR(-EAGAIN);
- pprev = rht_bucket_insert(ht, tbl, hash);
- if (!pprev)
- return ERR_PTR(-ENOMEM);
-
- head = rht_dereference_bucket(*pprev, tbl, hash);
+ head = rht_dereference_bucket(tbl->buckets[hash], tbl, hash);
RCU_INIT_POINTER(obj->next, head);
if (ht->rhlist) {
@@ -612,7 +509,7 @@ static struct bucket_table *rhashtable_insert_one(struct rhashtable *ht,
RCU_INIT_POINTER(list->next, NULL);
}
- rcu_assign_pointer(*pprev, obj);
+ rcu_assign_pointer(tbl->buckets[hash], obj);
atomic_inc(&ht->nelems);
if (rht_grow_above_75(ht, tbl))
@@ -1078,7 +975,7 @@ void rhashtable_free_and_destroy(struct rhashtable *ht,
void (*free_fn)(void *ptr, void *arg),
void *arg)
{
- struct bucket_table *tbl;
+ const struct bucket_table *tbl;
unsigned int i;
cancel_work_sync(&ht->run_work);
@@ -1089,7 +986,7 @@ void rhashtable_free_and_destroy(struct rhashtable *ht,
for (i = 0; i < tbl->size; i++) {
struct rhash_head *pos, *next;
- for (pos = rht_dereference(*rht_bucket(tbl, i), ht),
+ for (pos = rht_dereference(tbl->buckets[i], ht),
next = !rht_is_a_nulls(pos) ?
rht_dereference(pos->next, ht) : NULL;
!rht_is_a_nulls(pos);
@@ -1110,70 +1007,3 @@ void rhashtable_destroy(struct rhashtable *ht)
return rhashtable_free_and_destroy(ht, NULL, NULL);
}
EXPORT_SYMBOL_GPL(rhashtable_destroy);
-
-struct rhash_head __rcu **rht_bucket_nested(const struct bucket_table *tbl,
- unsigned int hash)
-{
- const unsigned int shift = PAGE_SHIFT - ilog2(sizeof(void *));
- static struct rhash_head __rcu *rhnull =
- (struct rhash_head __rcu *)NULLS_MARKER(0);
- unsigned int index = hash & ((1 << tbl->nest) - 1);
- unsigned int size = tbl->size >> tbl->nest;
- unsigned int subhash = hash;
- union nested_table *ntbl;
-
- ntbl = (union nested_table *)rcu_dereference_raw(tbl->buckets[0]);
- ntbl = rht_dereference_bucket(ntbl[index].table, tbl, hash);
- subhash >>= tbl->nest;
-
- while (ntbl && size > (1 << shift)) {
- index = subhash & ((1 << shift) - 1);
- ntbl = rht_dereference_bucket(ntbl[index].table, tbl, hash);
- size >>= shift;
- subhash >>= shift;
- }
-
- if (!ntbl)
- return &rhnull;
-
- return &ntbl[subhash].bucket;
-
-}
-EXPORT_SYMBOL_GPL(rht_bucket_nested);
-
-struct rhash_head __rcu **rht_bucket_nested_insert(struct rhashtable *ht,
- struct bucket_table *tbl,
- unsigned int hash)
-{
- const unsigned int shift = PAGE_SHIFT - ilog2(sizeof(void *));
- unsigned int index = hash & ((1 << tbl->nest) - 1);
- unsigned int size = tbl->size >> tbl->nest;
- union nested_table *ntbl;
- unsigned int shifted;
- unsigned int nhash;
-
- ntbl = (union nested_table *)rcu_dereference_raw(tbl->buckets[0]);
- hash >>= tbl->nest;
- nhash = index;
- shifted = tbl->nest;
- ntbl = nested_table_alloc(ht, &ntbl[index].table,
- size <= (1 << shift) ? shifted : 0, nhash);
-
- while (ntbl && size > (1 << shift)) {
- index = hash & ((1 << shift) - 1);
- size >>= shift;
- hash >>= shift;
- nhash |= index << shifted;
- shifted += shift;
- ntbl = nested_table_alloc(ht, &ntbl[index].table,
- size <= (1 << shift) ? shifted : 0,
- nhash);
- }
-
- if (!ntbl)
- return NULL;
-
- return &ntbl[hash].bucket;
-
-}
-EXPORT_SYMBOL_GPL(rht_bucket_nested_insert);
diff --git a/net/tipc/net.c b/net/tipc/net.c
index ab8a2d5d1e32..28bf4feeb81c 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -110,10 +110,6 @@ int tipc_net_start(struct net *net, u32 addr)
char addr_string[16];
tn->own_addr = addr;
-
- /* Ensure that the new address is visible before we reinit. */
- smp_mb();
-
tipc_named_reinit(net);
tipc_sk_reinit(net);
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 370a5912bcb5..800caaa699a1 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -384,6 +384,8 @@ static int tipc_sk_create(struct net *net, struct socket *sock,
INIT_LIST_HEAD(&tsk->publications);
msg = &tsk->phdr;
tn = net_generic(sock_net(sk), tipc_net_id);
+ tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
+ NAMED_H_SIZE, 0);
/* Finish initializing socket data structures */
sock->ops = ops;
@@ -393,13 +395,6 @@ static int tipc_sk_create(struct net *net, struct socket *sock,
pr_warn("Socket create failed; port number exhausted\n");
return -EINVAL;
}
-
- /* Ensure tsk is visible before we read own_addr. */
- smp_mb();
-
- tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
- NAMED_H_SIZE, 0);
-
msg_set_origport(msg, tsk->portid);
setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk);
sk->sk_shutdown = 0;
@@ -2274,27 +2269,24 @@ static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
void tipc_sk_reinit(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
- struct rhashtable_iter iter;
+ const struct bucket_table *tbl;
+ struct rhash_head *pos;
struct tipc_sock *tsk;
struct tipc_msg *msg;
+ int i;
- rhashtable_walk_enter(&tn->sk_rht, &iter);
-
- do {
- tsk = ERR_PTR(rhashtable_walk_start(&iter));
- if (tsk)
- continue;
-
- while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
+ rcu_read_lock();
+ tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
+ for (i = 0; i < tbl->size; i++) {
+ rht_for_each_entry_rcu(tsk, pos, tbl, i, node) {
spin_lock_bh(&tsk->sk.sk_lock.slock);
msg = &tsk->phdr;
msg_set_prevnode(msg, tn->own_addr);
msg_set_orignode(msg, tn->own_addr);
spin_unlock_bh(&tsk->sk.sk_lock.slock);
}
-
- rhashtable_walk_stop(&iter);
- } while (tsk == ERR_PTR(-EAGAIN));
+ }
+ rcu_read_unlock();
}
static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)