summaryrefslogtreecommitdiff
path: root/fs/nfsd
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/filecache.c238
-rw-r--r--fs/nfsd/filecache.h2
-rw-r--r--fs/nfsd/nfssvc.c9
3 files changed, 207 insertions, 42 deletions
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index c048e3071db7..e71af553c2ed 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -44,6 +44,17 @@ struct nfsd_fcache_bucket {
static DEFINE_PER_CPU(unsigned long, nfsd_file_cache_hits);
+struct nfsd_fcache_disposal {
+ struct list_head list;
+ struct work_struct work;
+ struct net *net;
+ spinlock_t lock;
+ struct list_head freeme;
+ struct rcu_head rcu;
+};
+
+struct workqueue_struct *nfsd_filecache_wq __read_mostly;
+
static struct kmem_cache *nfsd_file_slab;
static struct kmem_cache *nfsd_file_mark_slab;
static struct nfsd_fcache_bucket *nfsd_file_hashtbl;
@@ -52,32 +63,21 @@ static long nfsd_file_lru_flags;
static struct fsnotify_group *nfsd_file_fsnotify_group;
static atomic_long_t nfsd_filecache_count;
static struct delayed_work nfsd_filecache_laundrette;
+static DEFINE_SPINLOCK(laundrette_lock);
+static LIST_HEAD(laundrettes);
-enum nfsd_file_laundrette_ctl {
- NFSD_FILE_LAUNDRETTE_NOFLUSH = 0,
- NFSD_FILE_LAUNDRETTE_MAY_FLUSH
-};
+static void nfsd_file_gc(void);
static void
-nfsd_file_schedule_laundrette(enum nfsd_file_laundrette_ctl ctl)
+nfsd_file_schedule_laundrette(void)
{
long count = atomic_long_read(&nfsd_filecache_count);
if (count == 0 || test_bit(NFSD_FILE_SHUTDOWN, &nfsd_file_lru_flags))
return;
- /* Be more aggressive about scanning if over the threshold */
- if (count > NFSD_FILE_LRU_THRESHOLD)
- mod_delayed_work(system_wq, &nfsd_filecache_laundrette, 0);
- else
- schedule_delayed_work(&nfsd_filecache_laundrette, NFSD_LAUNDRETTE_DELAY);
-
- if (ctl == NFSD_FILE_LAUNDRETTE_NOFLUSH)
- return;
-
- /* ...and don't delay flushing if we're out of control */
- if (count >= NFSD_FILE_LRU_LIMIT)
- flush_delayed_work(&nfsd_filecache_laundrette);
+ queue_delayed_work(system_wq, &nfsd_filecache_laundrette,
+ NFSD_LAUNDRETTE_DELAY);
}
static void
@@ -312,7 +312,9 @@ nfsd_file_put(struct nfsd_file *nf)
set_bit(NFSD_FILE_REFERENCED, &nf->nf_flags);
if (nfsd_file_put_noref(nf) == 1 && is_hashed && unused)
- nfsd_file_schedule_laundrette(NFSD_FILE_LAUNDRETTE_MAY_FLUSH);
+ nfsd_file_schedule_laundrette();
+ if (atomic_long_read(&nfsd_filecache_count) >= NFSD_FILE_LRU_LIMIT)
+ nfsd_file_gc();
}
struct nfsd_file *
@@ -353,6 +355,58 @@ nfsd_file_dispose_list_sync(struct list_head *dispose)
flush_delayed_fput();
}
+static void
+nfsd_file_list_remove_disposal(struct list_head *dst,
+ struct nfsd_fcache_disposal *l)
+{
+ spin_lock(&l->lock);
+ list_splice_init(&l->freeme, dst);
+ spin_unlock(&l->lock);
+}
+
+static void
+nfsd_file_list_add_disposal(struct list_head *files, struct net *net)
+{
+ struct nfsd_fcache_disposal *l;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(l, &laundrettes, list) {
+ if (l->net == net) {
+ spin_lock(&l->lock);
+ list_splice_tail_init(files, &l->freeme);
+ spin_unlock(&l->lock);
+ queue_work(nfsd_filecache_wq, &l->work);
+ break;
+ }
+ }
+ rcu_read_unlock();
+}
+
+static void
+nfsd_file_list_add_pernet(struct list_head *dst, struct list_head *src,
+ struct net *net)
+{
+ struct nfsd_file *nf, *tmp;
+
+ list_for_each_entry_safe(nf, tmp, src, nf_lru) {
+ if (nf->nf_net == net)
+ list_move_tail(&nf->nf_lru, dst);
+ }
+}
+
+static void
+nfsd_file_dispose_list_delayed(struct list_head *dispose)
+{
+ LIST_HEAD(list);
+ struct nfsd_file *nf;
+
+ while(!list_empty(dispose)) {
+ nf = list_first_entry(dispose, struct nfsd_file, nf_lru);
+ nfsd_file_list_add_pernet(&list, dispose, nf->nf_net);
+ nfsd_file_list_add_disposal(&list, nf->nf_net);
+ }
+}
+
/*
* Note this can deadlock with nfsd_file_cache_purge.
*/
@@ -399,17 +453,40 @@ out_skip:
return LRU_SKIP;
}
-static void
-nfsd_file_lru_dispose(struct list_head *head)
+static unsigned long
+nfsd_file_lru_walk_list(struct shrink_control *sc)
{
+ LIST_HEAD(head);
struct nfsd_file *nf;
+ unsigned long ret;
- list_for_each_entry(nf, head, nf_lru) {
+ if (sc)
+ ret = list_lru_shrink_walk(&nfsd_file_lru, sc,
+ nfsd_file_lru_cb, &head);
+ else
+ ret = list_lru_walk(&nfsd_file_lru,
+ nfsd_file_lru_cb,
+ &head, LONG_MAX);
+ list_for_each_entry(nf, &head, nf_lru) {
spin_lock(&nfsd_file_hashtbl[nf->nf_hashval].nfb_lock);
nfsd_file_do_unhash(nf);
spin_unlock(&nfsd_file_hashtbl[nf->nf_hashval].nfb_lock);
}
- nfsd_file_dispose_list(head);
+ nfsd_file_dispose_list_delayed(&head);
+ return ret;
+}
+
+static void
+nfsd_file_gc(void)
+{
+ nfsd_file_lru_walk_list(NULL);
+}
+
+static void
+nfsd_file_gc_worker(struct work_struct *work)
+{
+ nfsd_file_gc();
+ nfsd_file_schedule_laundrette();
}
static unsigned long
@@ -421,12 +498,7 @@ nfsd_file_lru_count(struct shrinker *s, struct shrink_control *sc)
static unsigned long
nfsd_file_lru_scan(struct shrinker *s, struct shrink_control *sc)
{
- LIST_HEAD(head);
- unsigned long ret;
-
- ret = list_lru_shrink_walk(&nfsd_file_lru, sc, nfsd_file_lru_cb, &head);
- nfsd_file_lru_dispose(&head);
- return ret;
+ return nfsd_file_lru_walk_list(sc);
}
static struct shrinker nfsd_file_shrinker = {
@@ -488,7 +560,7 @@ nfsd_file_close_inode(struct inode *inode)
__nfsd_file_close_inode(inode, hashval, &dispose);
trace_nfsd_file_close_inode(inode, hashval, !list_empty(&dispose));
- nfsd_file_dispose_list(&dispose);
+ nfsd_file_dispose_list_delayed(&dispose);
}
/**
@@ -504,16 +576,11 @@ static void
nfsd_file_delayed_close(struct work_struct *work)
{
LIST_HEAD(head);
+ struct nfsd_fcache_disposal *l = container_of(work,
+ struct nfsd_fcache_disposal, work);
- list_lru_walk(&nfsd_file_lru, nfsd_file_lru_cb, &head, LONG_MAX);
-
- if (test_and_clear_bit(NFSD_FILE_LRU_RESCAN, &nfsd_file_lru_flags))
- nfsd_file_schedule_laundrette(NFSD_FILE_LAUNDRETTE_NOFLUSH);
-
- if (!list_empty(&head)) {
- nfsd_file_lru_dispose(&head);
- flush_delayed_fput();
- }
+ nfsd_file_list_remove_disposal(&head, l);
+ nfsd_file_dispose_list(&head);
}
static int
@@ -574,6 +641,10 @@ nfsd_file_cache_init(void)
if (nfsd_file_hashtbl)
return 0;
+ nfsd_filecache_wq = alloc_workqueue("nfsd_filecache", 0, 0);
+ if (!nfsd_filecache_wq)
+ goto out;
+
nfsd_file_hashtbl = kcalloc(NFSD_FILE_HASH_SIZE,
sizeof(*nfsd_file_hashtbl), GFP_KERNEL);
if (!nfsd_file_hashtbl) {
@@ -627,7 +698,7 @@ nfsd_file_cache_init(void)
spin_lock_init(&nfsd_file_hashtbl[i].nfb_lock);
}
- INIT_DELAYED_WORK(&nfsd_filecache_laundrette, nfsd_file_delayed_close);
+ INIT_DELAYED_WORK(&nfsd_filecache_laundrette, nfsd_file_gc_worker);
out:
return ret;
out_notifier:
@@ -643,6 +714,8 @@ out_err:
nfsd_file_mark_slab = NULL;
kfree(nfsd_file_hashtbl);
nfsd_file_hashtbl = NULL;
+ destroy_workqueue(nfsd_filecache_wq);
+ nfsd_filecache_wq = NULL;
goto out;
}
@@ -681,6 +754,88 @@ nfsd_file_cache_purge(struct net *net)
}
}
+static struct nfsd_fcache_disposal *
+nfsd_alloc_fcache_disposal(struct net *net)
+{
+ struct nfsd_fcache_disposal *l;
+
+ l = kmalloc(sizeof(*l), GFP_KERNEL);
+ if (!l)
+ return NULL;
+ INIT_WORK(&l->work, nfsd_file_delayed_close);
+ l->net = net;
+ spin_lock_init(&l->lock);
+ INIT_LIST_HEAD(&l->freeme);
+ return l;
+}
+
+static void
+nfsd_free_fcache_disposal(struct nfsd_fcache_disposal *l)
+{
+ rcu_assign_pointer(l->net, NULL);
+ cancel_work_sync(&l->work);
+ nfsd_file_dispose_list(&l->freeme);
+ kfree_rcu(l, rcu);
+}
+
+static void
+nfsd_add_fcache_disposal(struct nfsd_fcache_disposal *l)
+{
+ spin_lock(&laundrette_lock);
+ list_add_tail_rcu(&l->list, &laundrettes);
+ spin_unlock(&laundrette_lock);
+}
+
+static void
+nfsd_del_fcache_disposal(struct nfsd_fcache_disposal *l)
+{
+ spin_lock(&laundrette_lock);
+ list_del_rcu(&l->list);
+ spin_unlock(&laundrette_lock);
+}
+
+static int
+nfsd_alloc_fcache_disposal_net(struct net *net)
+{
+ struct nfsd_fcache_disposal *l;
+
+ l = nfsd_alloc_fcache_disposal(net);
+ if (!l)
+ return -ENOMEM;
+ nfsd_add_fcache_disposal(l);
+ return 0;
+}
+
+static void
+nfsd_free_fcache_disposal_net(struct net *net)
+{
+ struct nfsd_fcache_disposal *l;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(l, &laundrettes, list) {
+ if (l->net != net)
+ continue;
+ nfsd_del_fcache_disposal(l);
+ rcu_read_unlock();
+ nfsd_free_fcache_disposal(l);
+ return;
+ }
+ rcu_read_unlock();
+}
+
+int
+nfsd_file_cache_start_net(struct net *net)
+{
+ return nfsd_alloc_fcache_disposal_net(net);
+}
+
+void
+nfsd_file_cache_shutdown_net(struct net *net)
+{
+ nfsd_file_cache_purge(net);
+ nfsd_free_fcache_disposal_net(net);
+}
+
void
nfsd_file_cache_shutdown(void)
{
@@ -705,6 +860,8 @@ nfsd_file_cache_shutdown(void)
nfsd_file_mark_slab = NULL;
kfree(nfsd_file_hashtbl);
nfsd_file_hashtbl = NULL;
+ destroy_workqueue(nfsd_filecache_wq);
+ nfsd_filecache_wq = NULL;
}
static bool
@@ -872,7 +1029,8 @@ open_file:
nfsd_file_hashtbl[hashval].nfb_maxcount = max(nfsd_file_hashtbl[hashval].nfb_maxcount,
nfsd_file_hashtbl[hashval].nfb_count);
spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
- atomic_long_inc(&nfsd_filecache_count);
+ if (atomic_long_inc_return(&nfsd_filecache_count) >= NFSD_FILE_LRU_THRESHOLD)
+ nfsd_file_gc();
nf->nf_mark = nfsd_file_mark_find_or_create(nf);
if (nf->nf_mark)
diff --git a/fs/nfsd/filecache.h b/fs/nfsd/filecache.h
index 851d9abf54c2..79a7d6808d97 100644
--- a/fs/nfsd/filecache.h
+++ b/fs/nfsd/filecache.h
@@ -51,6 +51,8 @@ struct nfsd_file {
int nfsd_file_cache_init(void);
void nfsd_file_cache_purge(struct net *);
void nfsd_file_cache_shutdown(void);
+int nfsd_file_cache_start_net(struct net *net);
+void nfsd_file_cache_shutdown_net(struct net *net);
void nfsd_file_put(struct nfsd_file *nf);
struct nfsd_file *nfsd_file_get(struct nfsd_file *nf);
void nfsd_file_close_inode_sync(struct inode *inode);
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 7900f3494ecb..3b77b904212d 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -400,13 +400,18 @@ static int nfsd_startup_net(int nrservs, struct net *net, const struct cred *cre
nn->lockd_up = true;
}
- ret = nfs4_state_start_net(net);
+ ret = nfsd_file_cache_start_net(net);
if (ret)
goto out_lockd;
+ ret = nfs4_state_start_net(net);
+ if (ret)
+ goto out_filecache;
nn->nfsd_net_up = true;
return 0;
+out_filecache:
+ nfsd_file_cache_shutdown_net(net);
out_lockd:
if (nn->lockd_up) {
lockd_down(net);
@@ -421,7 +426,7 @@ static void nfsd_shutdown_net(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- nfsd_file_cache_purge(net);
+ nfsd_file_cache_shutdown_net(net);
nfs4_state_shutdown_net(net);
if (nn->lockd_up) {
lockd_down(net);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-16 21:49:30 +0300