dq_list_lock is no longer responsible for any synchronization,
get rid it completely.
Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
---
fs/quota/dquot.c | 36 ++----------------------------------
1 files changed, 2 insertions(+), 34 deletions(-)
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 99dc7a3..2aa8faf 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -88,7 +88,8 @@
* in inode_add_bytes() and inode_sub_bytes().
*
* The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
- * dq_list_lock > sb->s_dquot->dq_list_lock > hlist_bl_head
+ * dq_list_lock > hlist_bl_head
+
* Note that some things (eg. sb pointer, type, id) doesn't change during
* the life of the dquot structure and so needn't to be protected by a lock
*
@@ -123,7 +124,6 @@
* i_mutex on quota files is special (it's below dqio_mutex)
*/
-static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_fmt_lock);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
EXPORT_SYMBOL(dq_data_lock);
@@ -338,7 +338,6 @@ int dquot_mark_dquot_dirty(struct dquot *dquot)
if (test_bit(DQ_MOD_B, &dquot->dq_flags))
return 1;
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {
list_add(&dquot->dq_dirty,
@@ -346,7 +345,6 @@ int dquot_mark_dquot_dirty(struct dquot *dquot)
ret = 0;
}
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
return ret;
}
EXPORT_SYMBOL(dquot_mark_dquot_dirty);
@@ -438,15 +436,12 @@ int dquot_commit(struct dquot *dquot)
struct quota_info *dqopt = sb_dqopts(dquot);
mutex_lock(&dqopt->dqio_mutex);
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
if (!clear_dquot_dirty(dquot)) {
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
goto out_sem;
}
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
/* Inactive dquot can be only if there was error during read/init
* => we have better not writing it */
if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
@@ -518,7 +513,6 @@ static void invalidate_dquots(struct super_block *sb, int type)
struct quota_info *dqopt = dqopts(sb);
restart:
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
list_for_each_entry_safe(dquot, tmp, &dqopt->dq_inuse_list, dq_inuse) {
if (dquot->dq_sb != sb)
@@ -533,7 +527,6 @@ restart:
prepare_to_wait(&dquot->dq_wait_unused, &wait,
TASK_UNINTERRUPTIBLE);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
/* Once dqput() wakes us up, we know it's time to free
* the dquot.
* IMPORTANT: we rely on the fact that there is always
@@ -560,7 +553,6 @@ restart:
do_destroy_dquot(dquot);
}
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
}
/* Call callback for every active dquot on given filesystem */
@@ -574,7 +566,6 @@ int dquot_scan_active(struct super_block *sb,
mutex_lock(&dqctl(sb)->dqonoff_mutex);
dqopt = dqopts(sb);
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
list_for_each_entry(dquot, &dqopt->dq_inuse_list, dq_inuse) {
if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
@@ -584,20 +575,17 @@ int dquot_scan_active(struct super_block *sb,
/* Now we have active dquot so we can just increase use count */
atomic_inc(&dquot->dq_count);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
dqstats_inc(DQST_LOOKUPS);
dqput(old_dquot);
old_dquot = dquot;
ret = fn(dquot, priv);
if (ret < 0)
goto out;
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
/* We are safe to continue now because our dquot could not
* be moved out of the inuse list while we hold the reference */
}
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
out:
dqput(old_dquot);
mutex_unlock(&dqctl(sb)->dqonoff_mutex);
@@ -619,7 +607,6 @@ int dquot_quota_sync(struct super_block *sb, int type, int wait)
continue;
if (!sb_has_quota_active(sb, cnt))
continue;
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
dirty = &dqopt->info[cnt].dqi_dirty_list;
while (!list_empty(dirty)) {
@@ -635,15 +622,12 @@ int dquot_quota_sync(struct super_block *sb, int type, int wait)
* use count */
atomic_inc(&dquot->dq_count);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
dqstats_inc(DQST_LOOKUPS);
dqctl(sb)->dq_op->write_dquot(dquot);
dqput(dquot);
spin_lock(&dqopt->dq_list_lock);
- spin_lock(&dq_list_lock);
}
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
}
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
@@ -723,9 +707,7 @@ static void prune_dqcache(int count)
static int shrink_dqcache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
{
if (nr) {
- spin_lock(&dq_list_lock);
prune_dqcache(nr);
- spin_unlock(&dq_list_lock);
}
return ((unsigned)
percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])
@@ -758,7 +740,6 @@ void dqput(struct dquot *dquot)
dqopt = sb_dqopts(dquot);
dqstats_inc(DQST_DROPS);
we_slept:
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
if (atomic_read(&dquot->dq_count) > 1) {
/* We have more than one user... nothing to do */
@@ -768,13 +749,11 @@ we_slept:
atomic_read(&dquot->dq_count) == 1)
wake_up(&dquot->dq_wait_unused);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
return;
}
/* Need to release dquot? */
if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
/* Commit dquot before releasing */
ret = dqctl(dquot->dq_sb)->dq_op->write_dquot(dquot);
if (ret < 0) {
@@ -785,11 +764,9 @@ we_slept:
* We clear dirty bit anyway, so that we avoid
* infinite loop here
*/
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
clear_dquot_dirty(dquot);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
}
goto we_slept;
}
@@ -797,7 +774,6 @@ we_slept:
clear_dquot_dirty(dquot);
if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
dqctl(dquot->dq_sb)->dq_op->release_dquot(dquot);
goto we_slept;
}
@@ -808,7 +784,6 @@ we_slept:
#endif
put_dquot_last(dquot);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
}
EXPORT_SYMBOL(dqput);
@@ -863,11 +838,9 @@ struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
idx = srcu_read_lock(&dqopt->dq_srcu);
rcu_read_unlock();
we_slept:
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
if (!sb_has_quota_active(sb, type)) {
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
goto out;
}
hlist_bl_lock(blh);
@@ -876,7 +849,6 @@ we_slept:
if (!empty) {
hlist_bl_unlock(blh);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
empty = get_empty_dquot(sb, type);
if (!empty)
schedule(); /* Try to wait for a moment... */
@@ -891,7 +863,6 @@ we_slept:
/* all dquots go on the inuse_list */
put_inuse(dquot);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
dqstats_inc(DQST_LOOKUPS);
} else {
if (!atomic_read(&dquot->dq_count))
@@ -899,7 +870,6 @@ we_slept:
atomic_inc(&dquot->dq_count);
hlist_bl_unlock(blh);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
dqstats_inc(DQST_CACHE_HITS);
dqstats_inc(DQST_LOOKUPS);
}
@@ -1016,13 +986,11 @@ static int remove_inode_dquot_ref(struct inode *inode, int type,
"dq_count %d to dispose list",
atomic_read(&dquot->dq_count));
#endif
- spin_lock(&dq_list_lock);
spin_lock(&dqopt->dq_list_lock);
/* As dquot must have currently users it can't be on
* the free list... */
list_add(&dquot->dq_free, tofree_head);
spin_unlock(&dqopt->dq_list_lock);
- spin_unlock(&dq_list_lock);
return 1;
}
else
--
1.6.5.2
--
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