#include <linux/percpu.h>
#include <linux/list_sort.h>
#include <linux/lockref.h>
+#include <linux/rhashtable.h>
#include "gfs2.h"
#include "incore.h"
#include "trace_gfs2.h"
struct gfs2_glock_iter {
- int hash; /* hash bucket index */
- unsigned nhash; /* Index within current bucket */
struct gfs2_sbd *sdp; /* incore superblock */
+ struct rhashtable_iter hti; /* rhashtable iterator */
struct gfs2_glock *gl; /* current glock struct */
loff_t last_pos; /* last position */
};
#define GFS2_GL_HASH_SHIFT 15
#define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT)
-#define GFS2_GL_HASH_MASK (GFS2_GL_HASH_SIZE - 1)
-static struct hlist_bl_head gl_hash_table[GFS2_GL_HASH_SIZE];
-static struct dentry *gfs2_root;
-
-/**
- * gl_hash() - Turn glock number into hash bucket number
- * @lock: The glock number
- *
- * Returns: The number of the corresponding hash bucket
- */
-
-static unsigned int gl_hash(const struct gfs2_sbd *sdp,
- const struct lm_lockname *name)
-{
- unsigned int h;
-
- h = jhash(&name->ln_number, sizeof(u64), 0);
- h = jhash(&name->ln_type, sizeof(unsigned int), h);
- h = jhash(&sdp, sizeof(struct gfs2_sbd *), h);
- h &= GFS2_GL_HASH_MASK;
-
- return h;
-}
-
-static inline void spin_lock_bucket(unsigned int hash)
-{
- hlist_bl_lock(&gl_hash_table[hash]);
-}
+static struct rhashtable_params ht_parms = {
+ .nelem_hint = GFS2_GL_HASH_SIZE * 3 / 4,
+ .key_len = sizeof(struct lm_lockname),
+ .key_offset = offsetof(struct gfs2_glock, gl_name),
+ .head_offset = offsetof(struct gfs2_glock, gl_node),
+};
-static inline void spin_unlock_bucket(unsigned int hash)
-{
- hlist_bl_unlock(&gl_hash_table[hash]);
-}
+static struct rhashtable gl_hash_table;
-static void gfs2_glock_dealloc(struct rcu_head *rcu)
+void gfs2_glock_free(struct gfs2_glock *gl)
{
- struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu);
+ struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
if (gl->gl_ops->go_flags & GLOF_ASPACE) {
kmem_cache_free(gfs2_glock_aspace_cachep, gl);
kfree(gl->gl_lksb.sb_lvbptr);
kmem_cache_free(gfs2_glock_cachep, gl);
}
-}
-
-void gfs2_glock_free(struct gfs2_glock *gl)
-{
- struct gfs2_sbd *sdp = gl->gl_sbd;
-
- call_rcu(&gl->gl_rcu, gfs2_glock_dealloc);
if (atomic_dec_and_test(&sdp->sd_glock_disposal))
wake_up(&sdp->sd_glock_wait);
}
void gfs2_glock_put(struct gfs2_glock *gl)
{
- struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct address_space *mapping = gfs2_glock2aspace(gl);
if (lockref_put_or_lock(&gl->gl_lockref))
gfs2_glock_remove_from_lru(gl);
spin_unlock(&gl->gl_lockref.lock);
- spin_lock_bucket(gl->gl_hash);
- hlist_bl_del_rcu(&gl->gl_list);
- spin_unlock_bucket(gl->gl_hash);
+ rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms);
GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
GLOCK_BUG_ON(gl, mapping && mapping->nrpages);
trace_gfs2_glock_put(gl);
sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
}
-/**
- * search_bucket() - Find struct gfs2_glock by lock number
- * @bucket: the bucket to search
- * @name: The lock name
- *
- * Returns: NULL, or the struct gfs2_glock with the requested number
- */
-
-static struct gfs2_glock *search_bucket(unsigned int hash,
- const struct gfs2_sbd *sdp,
- const struct lm_lockname *name)
-{
- struct gfs2_glock *gl;
- struct hlist_bl_node *h;
-
- hlist_bl_for_each_entry_rcu(gl, h, &gl_hash_table[hash], gl_list) {
- if (!lm_name_equal(&gl->gl_name, name))
- continue;
- if (gl->gl_sbd != sdp)
- continue;
- if (lockref_get_not_dead(&gl->gl_lockref))
- return gl;
- }
-
- return NULL;
-}
-
/**
* may_grant - check if its ok to grant a new lock
* @gl: The glock
*/
static int do_promote(struct gfs2_glock *gl)
-__releases(&gl->gl_spin)
-__acquires(&gl->gl_spin)
+__releases(&gl->gl_lockref.lock)
+__acquires(&gl->gl_lockref.lock)
{
const struct gfs2_glock_operations *glops = gl->gl_ops;
struct gfs2_holder *gh, *tmp;
if (may_grant(gl, gh)) {
if (gh->gh_list.prev == &gl->gl_holders &&
glops->go_lock) {
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
/* FIXME: eliminate this eventually */
ret = glops->go_lock(gh);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (ret) {
if (ret == 1)
return 2;
unsigned state = ret & LM_OUT_ST_MASK;
int rv;
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
trace_gfs2_glock_state_change(gl, state);
state_change(gl, state);
gh = find_first_waiter(gl);
pr_err("wanted %u got %u\n", gl->gl_target, state);
GLOCK_BUG_ON(gl, 1);
}
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
return;
}
gfs2_demote_wake(gl);
if (state != LM_ST_UNLOCKED) {
if (glops->go_xmote_bh) {
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
rv = glops->go_xmote_bh(gl, gh);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (rv) {
do_error(gl, rv);
goto out;
out:
clear_bit(GLF_LOCK, &gl->gl_flags);
out_locked:
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
}
/**
*/
static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target)
-__releases(&gl->gl_spin)
-__acquires(&gl->gl_spin)
+__releases(&gl->gl_lockref.lock)
+__acquires(&gl->gl_lockref.lock)
{
const struct gfs2_glock_operations *glops = gl->gl_ops;
- struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
unsigned int lck_flags = gh ? gh->gh_flags : 0;
int ret;
(gl->gl_state == LM_ST_EXCLUSIVE) ||
(lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB)))
clear_bit(GLF_BLOCKING, &gl->gl_flags);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (glops->go_sync)
glops->go_sync(gl);
if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags))
gfs2_glock_put(gl);
}
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
}
/**
*/
static void run_queue(struct gfs2_glock *gl, const int nonblock)
-__releases(&gl->gl_spin)
-__acquires(&gl->gl_spin)
+__releases(&gl->gl_lockref.lock)
+__acquires(&gl->gl_lockref.lock)
{
struct gfs2_holder *gh = NULL;
int ret;
static void delete_work_func(struct work_struct *work)
{
struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete);
- struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct gfs2_inode *ip;
struct inode *inode;
u64 no_addr = gl->gl_name.ln_number;
finish_xmote(gl, gl->gl_reply);
drop_ref = 1;
}
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
gl->gl_state != LM_ST_UNLOCKED &&
gl->gl_demote_state != LM_ST_EXCLUSIVE) {
}
}
run_queue(gl, 0);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (!delay)
gfs2_glock_put(gl);
else {
struct gfs2_glock **glp)
{
struct super_block *s = sdp->sd_vfs;
- struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type };
- struct gfs2_glock *gl, *tmp;
- unsigned int hash = gl_hash(sdp, &name);
+ struct lm_lockname name = { .ln_number = number,
+ .ln_type = glops->go_type,
+ .ln_sbd = sdp };
+ struct gfs2_glock *gl, *tmp = NULL;
struct address_space *mapping;
struct kmem_cache *cachep;
+ int ret, tries = 0;
- rcu_read_lock();
- gl = search_bucket(hash, sdp, &name);
- rcu_read_unlock();
+ gl = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
+ if (gl && !lockref_get_not_dead(&gl->gl_lockref))
+ gl = NULL;
*glp = gl;
if (gl)
}
atomic_inc(&sdp->sd_glock_disposal);
- gl->gl_sbd = sdp;
+ gl->gl_node.next = NULL;
gl->gl_flags = 0;
gl->gl_name = name;
gl->gl_lockref.count = 1;
gl->gl_state = LM_ST_UNLOCKED;
gl->gl_target = LM_ST_UNLOCKED;
gl->gl_demote_state = LM_ST_EXCLUSIVE;
- gl->gl_hash = hash;
gl->gl_ops = glops;
gl->gl_dstamp = ktime_set(0, 0);
preempt_disable();
mapping->writeback_index = 0;
}
- spin_lock_bucket(hash);
- tmp = search_bucket(hash, sdp, &name);
- if (tmp) {
- spin_unlock_bucket(hash);
- kfree(gl->gl_lksb.sb_lvbptr);
- kmem_cache_free(cachep, gl);
- atomic_dec(&sdp->sd_glock_disposal);
- gl = tmp;
- } else {
- hlist_bl_add_head_rcu(&gl->gl_list, &gl_hash_table[hash]);
- spin_unlock_bucket(hash);
+again:
+ ret = rhashtable_lookup_insert_fast(&gl_hash_table, &gl->gl_node,
+ ht_parms);
+ if (ret == 0) {
+ *glp = gl;
+ return 0;
}
- *glp = gl;
+ if (ret == -EEXIST) {
+ ret = 0;
+ tmp = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
+ if (tmp == NULL || !lockref_get_not_dead(&tmp->gl_lockref)) {
+ if (++tries < 100) {
+ cond_resched();
+ goto again;
+ }
+ tmp = NULL;
+ ret = -ENOMEM;
+ }
+ } else {
+ WARN_ON_ONCE(ret);
+ }
+ kfree(gl->gl_lksb.sb_lvbptr);
+ kmem_cache_free(cachep, gl);
+ atomic_dec(&sdp->sd_glock_disposal);
+ *glp = tmp;
- return 0;
+ return ret;
}
/**
*/
static inline void add_to_queue(struct gfs2_holder *gh)
-__releases(&gl->gl_spin)
-__acquires(&gl->gl_spin)
+__releases(&gl->gl_lockref.lock)
+__acquires(&gl->gl_lockref.lock)
{
struct gfs2_glock *gl = gh->gh_gl;
- struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct list_head *insert_pt = NULL;
struct gfs2_holder *gh2;
int try_futile = 0;
do_cancel:
gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
if (!(gh->gh_flags & LM_FLAG_PRIORITY)) {
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (sdp->sd_lockstruct.ls_ops->lm_cancel)
sdp->sd_lockstruct.ls_ops->lm_cancel(gl);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
}
return;
int gfs2_glock_nq(struct gfs2_holder *gh)
{
struct gfs2_glock *gl = gh->gh_gl;
- struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
int error = 0;
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
if (test_bit(GLF_LRU, &gl->gl_flags))
gfs2_glock_remove_from_lru(gl);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
add_to_queue(gh);
if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) &&
test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) {
gl->gl_lockref.count--;
}
run_queue(gl, 1);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (!(gh->gh_flags & GL_ASYNC))
error = gfs2_glock_wait(gh);
unsigned delay = 0;
int fast_path = 0;
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (gh->gh_flags & GL_NOCACHE)
handle_callback(gl, LM_ST_UNLOCKED, 0, false);
if (find_first_holder(gl) == NULL) {
if (glops->go_unlock) {
GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags));
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
glops->go_unlock(gh);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
clear_bit(GLF_LOCK, &gl->gl_flags);
}
if (list_empty(&gl->gl_holders) &&
!test_bit(GLF_DEMOTE, &gl->gl_flags))
fast_path = 1;
}
- if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl))
+ if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl) &&
+ (glops->go_flags & GLOF_LRU))
gfs2_glock_add_to_lru(gl);
trace_gfs2_glock_queue(gh, 0);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (likely(fast_path))
return;
delay = gl->gl_hold_time;
}
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
handle_callback(gl, state, delay, true);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
gfs2_glock_put(gl);
}
* @gl: Pointer to the glock
* @ret: The return value from the dlm
*
- * The gl_reply field is under the gl_spin lock so that it is ok
+ * The gl_reply field is under the gl_lockref.lock lock so that it is ok
* to use a bitfield shared with other glock state fields.
*/
void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
{
- struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
+ struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
gl->gl_reply = ret;
if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) {
if (gfs2_should_freeze(gl)) {
set_bit(GLF_FROZEN, &gl->gl_flags);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
return;
}
}
gl->gl_lockref.count++;
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
while(!list_empty(list)) {
gl = list_entry(list->next, struct gfs2_glock, gl_lru);
list_del_init(&gl->gl_lru);
- if (!spin_trylock(&gl->gl_spin)) {
+ if (!spin_trylock(&gl->gl_lockref.lock)) {
add_back_to_lru:
list_add(&gl->gl_lru, &lru_list);
atomic_inc(&lru_count);
continue;
}
if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
goto add_back_to_lru;
}
clear_bit(GLF_LRU, &gl->gl_flags);
WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags));
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gl->gl_lockref.count--;
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
cond_resched_lock(&lru_lock);
}
}
*
*/
-static void examine_bucket(glock_examiner examiner, const struct gfs2_sbd *sdp,
- unsigned int hash)
+static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
{
struct gfs2_glock *gl;
- struct hlist_bl_head *head = &gl_hash_table[hash];
- struct hlist_bl_node *pos;
+ struct rhash_head *pos, *next;
+ const struct bucket_table *tbl;
+ int i;
rcu_read_lock();
- hlist_bl_for_each_entry_rcu(gl, pos, head, gl_list) {
- if ((gl->gl_sbd == sdp) && lockref_get_not_dead(&gl->gl_lockref))
- examiner(gl);
+ tbl = rht_dereference_rcu(gl_hash_table.tbl, &gl_hash_table);
+ for (i = 0; i < tbl->size; i++) {
+ rht_for_each_entry_safe(gl, pos, next, tbl, i, gl_node) {
+ if ((gl->gl_name.ln_sbd == sdp) &&
+ lockref_get_not_dead(&gl->gl_lockref))
+ examiner(gl);
+ }
}
rcu_read_unlock();
cond_resched();
}
-static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
-{
- unsigned x;
-
- for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
- examine_bucket(examiner, sdp, x);
-}
-
-
/**
* thaw_glock - thaw out a glock which has an unprocessed reply waiting
* @gl: The glock to thaw
{
gfs2_glock_remove_from_lru(gl);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (gl->gl_state != LM_ST_UNLOCKED)
handle_callback(gl, LM_ST_UNLOCKED, 0, false);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
}
static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl)
{
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
gfs2_dump_glock(seq, gl);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
}
static void dump_glock_func(struct gfs2_glock *gl)
int ret;
ret = gfs2_truncatei_resume(ip);
- gfs2_assert_withdraw(gl->gl_sbd, ret == 0);
+ gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
clear_bit(GLF_LOCK, &gl->gl_flags);
run_queue(gl, 1);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
}
static const char *state2str(unsigned state)
{
struct gfs2_glock *gl = iter_ptr;
- seq_printf(seq, "G: n:%u/%llx rtt:%lld/%lld rttb:%lld/%lld irt:%lld/%lld dcnt: %lld qcnt: %lld\n",
+ seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n",
gl->gl_name.ln_type,
(unsigned long long)gl->gl_name.ln_number,
- (long long)gl->gl_stats.stats[GFS2_LKS_SRTT],
- (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR],
- (long long)gl->gl_stats.stats[GFS2_LKS_SRTTB],
- (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB],
- (long long)gl->gl_stats.stats[GFS2_LKS_SIRT],
- (long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR],
- (long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT],
- (long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]);
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]);
return 0;
}
static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr)
{
- struct gfs2_glock_iter *gi = seq->private;
- struct gfs2_sbd *sdp = gi->sdp;
- unsigned index = gi->hash >> 3;
- unsigned subindex = gi->hash & 0x07;
- s64 value;
+ struct gfs2_sbd *sdp = seq->private;
+ loff_t pos = *(loff_t *)iter_ptr;
+ unsigned index = pos >> 3;
+ unsigned subindex = pos & 0x07;
int i;
if (index == 0 && subindex != 0)
for_each_possible_cpu(i) {
const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i);
- if (index == 0) {
- value = i;
- } else {
- value = lkstats->lkstats[index - 1].stats[subindex];
- }
- seq_printf(seq, " %15lld", (long long)value);
+
+ if (index == 0)
+ seq_printf(seq, " %15u", i);
+ else
+ seq_printf(seq, " %15llu", (unsigned long long)lkstats->
+ lkstats[index - 1].stats[subindex]);
}
seq_putc(seq, '\n');
return 0;
int __init gfs2_glock_init(void)
{
- unsigned i;
- for(i = 0; i < GFS2_GL_HASH_SIZE; i++) {
- INIT_HLIST_BL_HEAD(&gl_hash_table[i]);
- }
+ int ret;
+
+ ret = rhashtable_init(&gl_hash_table, &ht_parms);
+ if (ret < 0)
+ return ret;
glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM |
WQ_HIGHPRI | WQ_FREEZABLE, 0);
- if (!glock_workqueue)
+ if (!glock_workqueue) {
+ rhashtable_destroy(&gl_hash_table);
return -ENOMEM;
+ }
gfs2_delete_workqueue = alloc_workqueue("delete_workqueue",
WQ_MEM_RECLAIM | WQ_FREEZABLE,
0);
if (!gfs2_delete_workqueue) {
destroy_workqueue(glock_workqueue);
+ rhashtable_destroy(&gl_hash_table);
return -ENOMEM;
}
void gfs2_glock_exit(void)
{
unregister_shrinker(&glock_shrinker);
+ rhashtable_destroy(&gl_hash_table);
destroy_workqueue(glock_workqueue);
destroy_workqueue(gfs2_delete_workqueue);
}
-static inline struct gfs2_glock *glock_hash_chain(unsigned hash)
-{
- return hlist_bl_entry(hlist_bl_first_rcu(&gl_hash_table[hash]),
- struct gfs2_glock, gl_list);
-}
-
-static inline struct gfs2_glock *glock_hash_next(struct gfs2_glock *gl)
+static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
{
- return hlist_bl_entry(rcu_dereference(gl->gl_list.next),
- struct gfs2_glock, gl_list);
-}
-
-static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
-{
- struct gfs2_glock *gl;
-
do {
- gl = gi->gl;
- if (gl) {
- gi->gl = glock_hash_next(gl);
- gi->nhash++;
- } else {
- if (gi->hash >= GFS2_GL_HASH_SIZE) {
- rcu_read_unlock();
- return 1;
- }
- gi->gl = glock_hash_chain(gi->hash);
- gi->nhash = 0;
- }
- while (gi->gl == NULL) {
- gi->hash++;
- if (gi->hash >= GFS2_GL_HASH_SIZE) {
- rcu_read_unlock();
- return 1;
- }
- gi->gl = glock_hash_chain(gi->hash);
- gi->nhash = 0;
+ gi->gl = rhashtable_walk_next(&gi->hti);
+ if (IS_ERR(gi->gl)) {
+ if (PTR_ERR(gi->gl) == -EAGAIN)
+ continue;
+ gi->gl = NULL;
}
/* Skip entries for other sb and dead entries */
- } while (gi->sdp != gi->gl->gl_sbd ||
- __lockref_is_dead(&gi->gl->gl_lockref));
-
- return 0;
+ } while ((gi->gl) && ((gi->sdp != gi->gl->gl_name.ln_sbd) ||
+ __lockref_is_dead(&gi->gl->gl_lockref)));
}
static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos)
{
struct gfs2_glock_iter *gi = seq->private;
loff_t n = *pos;
+ int ret;
if (gi->last_pos <= *pos)
- n = gi->nhash + (*pos - gi->last_pos);
- else
- gi->hash = 0;
+ n = (*pos - gi->last_pos);
- gi->nhash = 0;
- rcu_read_lock();
+ ret = rhashtable_walk_start(&gi->hti);
+ if (ret)
+ return NULL;
do {
- if (gfs2_glock_iter_next(gi))
- return NULL;
- } while (n--);
+ gfs2_glock_iter_next(gi);
+ } while (gi->gl && n--);
gi->last_pos = *pos;
return gi->gl;
(*pos)++;
gi->last_pos = *pos;
- if (gfs2_glock_iter_next(gi))
- return NULL;
-
+ gfs2_glock_iter_next(gi);
return gi->gl;
}
{
struct gfs2_glock_iter *gi = seq->private;
- if (gi->gl)
- rcu_read_unlock();
gi->gl = NULL;
+ rhashtable_walk_stop(&gi->hti);
}
static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr)
static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos)
{
- struct gfs2_glock_iter *gi = seq->private;
-
- gi->hash = *pos;
+ preempt_disable();
if (*pos >= GFS2_NR_SBSTATS)
return NULL;
- preempt_disable();
- return SEQ_START_TOKEN;
+ return pos;
}
static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr,
loff_t *pos)
{
- struct gfs2_glock_iter *gi = seq->private;
(*pos)++;
- gi->hash++;
- if (gi->hash >= GFS2_NR_SBSTATS) {
- preempt_enable();
+ if (*pos >= GFS2_NR_SBSTATS)
return NULL;
- }
- return SEQ_START_TOKEN;
+ return pos;
}
static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr)
if (ret == 0) {
struct seq_file *seq = file->private_data;
struct gfs2_glock_iter *gi = seq->private;
+
gi->sdp = inode->i_private;
+ gi->last_pos = 0;
seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);
if (seq->buf)
seq->size = GFS2_SEQ_GOODSIZE;
+ gi->gl = NULL;
+ ret = rhashtable_walk_init(&gl_hash_table, &gi->hti);
}
return ret;
}
+static int gfs2_glocks_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = file->private_data;
+ struct gfs2_glock_iter *gi = seq->private;
+
+ gi->gl = NULL;
+ rhashtable_walk_exit(&gi->hti);
+ return seq_release_private(inode, file);
+}
+
static int gfs2_glstats_open(struct inode *inode, struct file *file)
{
int ret = seq_open_private(file, &gfs2_glstats_seq_ops,
struct seq_file *seq = file->private_data;
struct gfs2_glock_iter *gi = seq->private;
gi->sdp = inode->i_private;
+ gi->last_pos = 0;
seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);
if (seq->buf)
seq->size = GFS2_SEQ_GOODSIZE;
+ gi->gl = NULL;
+ ret = rhashtable_walk_init(&gl_hash_table, &gi->hti);
}
return ret;
}
static int gfs2_sbstats_open(struct inode *inode, struct file *file)
{
- int ret = seq_open_private(file, &gfs2_sbstats_seq_ops,
- sizeof(struct gfs2_glock_iter));
+ int ret = seq_open(file, &gfs2_sbstats_seq_ops);
if (ret == 0) {
struct seq_file *seq = file->private_data;
- struct gfs2_glock_iter *gi = seq->private;
- gi->sdp = inode->i_private;
+ seq->private = inode->i_private; /* sdp */
}
return ret;
}
.open = gfs2_glocks_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release_private,
+ .release = gfs2_glocks_release,
};
static const struct file_operations gfs2_glstats_fops = {
.open = gfs2_glstats_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release_private,
+ .release = gfs2_glocks_release,
};
static const struct file_operations gfs2_sbstats_fops = {
.open = gfs2_sbstats_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release_private,
+ .release = seq_release,
};
int gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
Code Review / kvmfornfv.git / blobdiff