static struct list_lru nfsd_file_lru;
static unsigned long nfsd_file_flags;
static struct fsnotify_group *nfsd_file_fsnotify_group;
-static atomic_long_t nfsd_filecache_count;
static struct delayed_work nfsd_filecache_laundrette;
static struct rhashtable nfsd_file_rhash_tbl
____cacheline_aligned_in_smp;
static void
nfsd_file_schedule_laundrette(void)
{
- if ((atomic_long_read(&nfsd_filecache_count) == 0) ||
+ if ((atomic_read(&nfsd_file_rhash_tbl.nelems) == 0) ||
test_bit(NFSD_FILE_CACHE_UP, &nfsd_file_flags) == 0)
return;
}
static struct nfsd_file *
-nfsd_file_alloc(struct inode *inode, unsigned int may, struct net *net)
+nfsd_file_alloc(struct nfsd_file_lookup_key *key, unsigned int may)
{
struct nfsd_file *nf;
nf->nf_birthtime = ktime_get();
nf->nf_file = NULL;
nf->nf_cred = get_current_cred();
- nf->nf_net = net;
+ nf->nf_net = key->net;
nf->nf_flags = 0;
- nf->nf_inode = inode;
- refcount_set(&nf->nf_ref, 1);
- nf->nf_may = may & NFSD_FILE_MAY_MASK;
+ __set_bit(NFSD_FILE_HASHED, &nf->nf_flags);
+ __set_bit(NFSD_FILE_PENDING, &nf->nf_flags);
+ nf->nf_inode = key->inode;
+ /* nf_ref is pre-incremented for hash table */
+ refcount_set(&nf->nf_ref, 2);
+ nf->nf_may = key->need;
nf->nf_mark = NULL;
trace_nfsd_file_alloc(nf);
}
}
static void
-nfsd_file_do_unhash(struct nfsd_file *nf)
+nfsd_file_hash_remove(struct nfsd_file *nf)
{
- struct inode *inode = nf->nf_inode;
- unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
- NFSD_FILE_HASH_BITS);
-
- lockdep_assert_held(&nfsd_file_hashtbl[hashval].nfb_lock);
-
trace_nfsd_file_unhash(nf);
if (nfsd_file_check_write_error(nf))
nfsd_reset_write_verifier(net_generic(nf->nf_net, nfsd_net_id));
- --nfsd_file_hashtbl[hashval].nfb_count;
- hlist_del_rcu(&nf->nf_node);
- atomic_long_dec(&nfsd_filecache_count);
-}
-
-static void
-nfsd_file_hash_remove(struct nfsd_file *nf)
-{
- struct inode *inode = nf->nf_inode;
- unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
- NFSD_FILE_HASH_BITS);
-
- spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
- nfsd_file_do_unhash(nf);
- spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
+ rhashtable_remove_fast(&nfsd_file_rhash_tbl, &nf->nf_rhash,
+ nfsd_file_rhash_params);
}
static bool
nfsd_file_unhash(struct nfsd_file *nf)
{
if (test_and_clear_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
- nfsd_file_do_unhash(nf);
+ nfsd_file_hash_remove(nf);
return true;
}
return false;
* Return true if the file was unhashed.
*/
static bool
-nfsd_file_unhash_and_release_locked(struct nfsd_file *nf, struct list_head *dispose)
+nfsd_file_unhash_and_dispose(struct nfsd_file *nf, struct list_head *dispose)
{
- trace_nfsd_file_unhash_and_release_locked(nf);
+ trace_nfsd_file_unhash_and_dispose(nf);
if (!nfsd_file_unhash(nf))
return false;
/* keep final reference for nfsd_file_lru_dispose */
static unsigned int
__nfsd_file_close_inode(struct inode *inode, struct list_head *dispose)
{
- unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
- NFSD_FILE_HASH_BITS);
- unsigned int count = 0;
- struct nfsd_file *nf;
- struct hlist_node *tmp;
-
- spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
- hlist_for_each_entry_safe(nf, tmp, &nfsd_file_hashtbl[hashval].nfb_head, nf_node) {
- if (inode == nf->nf_inode) {
- nfsd_file_unhash_and_release_locked(nf, dispose);
- count++;
- }
- }
- spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
+ struct nfsd_file_lookup_key key = {
+ .type = NFSD_FILE_KEY_INODE,
+ .inode = inode,
+ };
+ unsigned int count = 0;
+ struct nfsd_file *nf;
+
+ rcu_read_lock();
+ do {
+ nf = rhashtable_lookup(&nfsd_file_rhash_tbl, &key,
+ nfsd_file_rhash_params);
+ if (!nf)
+ break;
+ nfsd_file_unhash_and_dispose(nf, dispose);
+ count++;
+ } while (1);
+ rcu_read_unlock();
return count;
}
static void
__nfsd_file_cache_purge(struct net *net)
{
- unsigned int i;
- struct nfsd_file *nf;
- struct hlist_node *next;
+ struct rhashtable_iter iter;
+ struct nfsd_file *nf;
LIST_HEAD(dispose);
bool del;
- for (i = 0; i < NFSD_FILE_HASH_SIZE; i++) {
- struct nfsd_fcache_bucket *nfb = &nfsd_file_hashtbl[i];
+ rhashtable_walk_enter(&nfsd_file_rhash_tbl, &iter);
+ do {
+ rhashtable_walk_start(&iter);
- spin_lock(&nfb->nfb_lock);
- hlist_for_each_entry_safe(nf, next, &nfb->nfb_head, nf_node) {
+ nf = rhashtable_walk_next(&iter);
+ while (!IS_ERR_OR_NULL(nf)) {
if (net && nf->nf_net != net)
continue;
- del = nfsd_file_unhash_and_release_locked(nf, &dispose);
+ del = nfsd_file_unhash_and_dispose(nf, &dispose);
/*
* Deadlock detected! Something marked this entry as
* unhased, but hasn't removed it from the hash list.
*/
WARN_ON_ONCE(!del);
+
+ nf = rhashtable_walk_next(&iter);
}
- spin_unlock(&nfb->nfb_lock);
- nfsd_file_dispose_list(&dispose);
- }
+
+ rhashtable_walk_stop(&iter);
+ } while (nf == ERR_PTR(-EAGAIN));
+ rhashtable_walk_exit(&iter);
+
+ nfsd_file_dispose_list(&dispose);
}
static struct nfsd_fcache_disposal *
}
}
-static struct nfsd_file *
-nfsd_file_find_locked(struct inode *inode, unsigned int may_flags,
- unsigned int hashval, struct net *net)
-{
- struct nfsd_file *nf;
- unsigned char need = may_flags & NFSD_FILE_MAY_MASK;
-
- hlist_for_each_entry_rcu(nf, &nfsd_file_hashtbl[hashval].nfb_head,
- nf_node, lockdep_is_held(&nfsd_file_hashtbl[hashval].nfb_lock)) {
- if (nf->nf_may != need)
- continue;
- if (nf->nf_inode != inode)
- continue;
- if (nf->nf_net != net)
- continue;
- if (!nfsd_match_cred(nf->nf_cred, current_cred()))
- continue;
- if (!test_bit(NFSD_FILE_HASHED, &nf->nf_flags))
- continue;
- if (nfsd_file_get(nf) != NULL)
- return nf;
- }
- return NULL;
-}
-
/**
- * nfsd_file_is_cached - are there any cached open files for this fh?
- * @inode: inode of the file to check
+ * nfsd_file_is_cached - are there any cached open files for this inode?
+ * @inode: inode to check
+ *
+ * The lookup matches inodes in all net namespaces and is atomic wrt
+ * nfsd_file_acquire().
*
- * Scan the hashtable for open files that match this fh. Returns true if there
- * are any, and false if not.
+ * Return values:
+ * %true: filecache contains at least one file matching this inode
+ * %false: filecache contains no files matching this inode
*/
bool
nfsd_file_is_cached(struct inode *inode)
{
- bool ret = false;
- struct nfsd_file *nf;
- unsigned int hashval;
-
- hashval = (unsigned int)hash_long(inode->i_ino, NFSD_FILE_HASH_BITS);
-
- rcu_read_lock();
- hlist_for_each_entry_rcu(nf, &nfsd_file_hashtbl[hashval].nfb_head,
- nf_node) {
- if (inode == nf->nf_inode) {
- ret = true;
- break;
- }
- }
- rcu_read_unlock();
+ struct nfsd_file_lookup_key key = {
+ .type = NFSD_FILE_KEY_INODE,
+ .inode = inode,
+ };
+ bool ret = false;
+
+ if (rhashtable_lookup_fast(&nfsd_file_rhash_tbl, &key,
+ nfsd_file_rhash_params) != NULL)
+ ret = true;
trace_nfsd_file_is_cached(inode, (int)ret);
return ret;
}
nfsd_do_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
unsigned int may_flags, struct nfsd_file **pnf, bool open)
{
- __be32 status;
- struct net *net = SVC_NET(rqstp);
+ struct nfsd_file_lookup_key key = {
+ .type = NFSD_FILE_KEY_FULL,
+ .need = may_flags & NFSD_FILE_MAY_MASK,
+ .net = SVC_NET(rqstp),
+ };
struct nfsd_file *nf, *new;
- struct inode *inode;
- unsigned int hashval;
bool retry = true;
+ __be32 status;
- /* FIXME: skip this if fh_dentry is already set? */
status = fh_verify(rqstp, fhp, S_IFREG,
may_flags|NFSD_MAY_OWNER_OVERRIDE);
if (status != nfs_ok)
return status;
+ key.inode = d_inode(fhp->fh_dentry);
+ key.cred = get_current_cred();
- inode = d_inode(fhp->fh_dentry);
- hashval = (unsigned int)hash_long(inode->i_ino, NFSD_FILE_HASH_BITS);
retry:
- rcu_read_lock();
- nf = nfsd_file_find_locked(inode, may_flags, hashval, net);
- rcu_read_unlock();
+ /* Avoid allocation if the item is already in cache */
+ nf = rhashtable_lookup_fast(&nfsd_file_rhash_tbl, &key,
+ nfsd_file_rhash_params);
+ if (nf)
+ nf = nfsd_file_get(nf);
if (nf)
goto wait_for_construction;
- new = nfsd_file_alloc(inode, may_flags, net);
+ new = nfsd_file_alloc(&key, may_flags);
if (!new) {
status = nfserr_jukebox;
goto out_status;
}
- spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
- nf = nfsd_file_find_locked(inode, may_flags, hashval, net);
- if (nf == NULL)
+ nf = rhashtable_lookup_get_insert_key(&nfsd_file_rhash_tbl,
+ &key, &new->nf_rhash,
+ nfsd_file_rhash_params);
+ if (!nf) {
+ nf = new;
+ goto open_file;
+ }
+ if (IS_ERR(nf))
+ goto insert_err;
+ nf = nfsd_file_get(nf);
+ if (nf == NULL) {
+ nf = new;
goto open_file;
- spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
+ }
nfsd_file_slab_free(&new->nf_rcu);
wait_for_construction:
/* Did construction of this file fail? */
if (!test_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
+ trace_nfsd_file_cons_err(rqstp, key.inode, may_flags, nf);
if (!retry) {
status = nfserr_jukebox;
goto out;
}
out_status:
- trace_nfsd_file_acquire(rqstp, inode, may_flags, nf, status);
+ put_cred(key.cred);
+ trace_nfsd_file_acquire(rqstp, key.inode, may_flags, nf, status);
return status;
open_file:
- nf = new;
- /* Take reference for the hashtable */
- refcount_inc(&nf->nf_ref);
- __set_bit(NFSD_FILE_HASHED, &nf->nf_flags);
- __set_bit(NFSD_FILE_PENDING, &nf->nf_flags);
- hlist_add_head_rcu(&nf->nf_node, &nfsd_file_hashtbl[hashval].nfb_head);
- ++nfsd_file_hashtbl[hashval].nfb_count;
- 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);
-
nf->nf_mark = nfsd_file_mark_find_or_create(nf);
if (nf->nf_mark) {
if (open) {
* If construction failed, or we raced with a call to unlink()
* then unhash.
*/
- if (status != nfs_ok || inode->i_nlink == 0) {
- bool do_free;
- nfsd_file_lru_remove(nf);
- spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
- do_free = nfsd_file_unhash(nf);
- spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
- if (do_free)
+ if (status != nfs_ok || key.inode->i_nlink == 0)
+ if (nfsd_file_unhash(nf))
nfsd_file_put_noref(nf);
- }
clear_bit_unlock(NFSD_FILE_PENDING, &nf->nf_flags);
smp_mb__after_atomic();
wake_up_bit(&nf->nf_flags, NFSD_FILE_PENDING);
goto out;
+
+insert_err:
+ nfsd_file_slab_free(&new->nf_rcu);
+ trace_nfsd_file_insert_err(rqstp, key.inode, may_flags, PTR_ERR(nf));
+ nf = NULL;
+ status = nfserr_jukebox;
+ goto out_status;
}
/**
{
unsigned long releases = 0, pages_flushed = 0, evictions = 0;
unsigned long hits = 0, acquisitions = 0;
- unsigned int i, count = 0, longest = 0;
+ unsigned int i, count = 0, buckets = 0;
unsigned long lru = 0, total_age = 0;
- /*
- * No need for spinlocks here since we're not terribly interested in
- * accuracy. We do take the nfsd_mutex simply to ensure that we
- * don't end up racing with server shutdown
- */
+ /* Serialize with server shutdown */
mutex_lock(&nfsd_mutex);
if (test_bit(NFSD_FILE_CACHE_UP, &nfsd_file_flags) == 1) {
- for (i = 0; i < NFSD_FILE_HASH_SIZE; i++) {
- count += nfsd_file_hashtbl[i].nfb_count;
- longest = max(longest, nfsd_file_hashtbl[i].nfb_count);
- }
+ struct bucket_table *tbl;
+ struct rhashtable *ht;
+
lru = list_lru_count(&nfsd_file_lru);
+
+ rcu_read_lock();
+ ht = &nfsd_file_rhash_tbl;
+ count = atomic_read(&ht->nelems);
+ tbl = rht_dereference_rcu(ht->tbl, ht);
+ buckets = tbl->size;
+ rcu_read_unlock();
}
mutex_unlock(&nfsd_mutex);
}
seq_printf(m, "total entries: %u\n", count);
- seq_printf(m, "longest chain: %u\n", longest);
+ seq_printf(m, "hash buckets: %u\n", buckets);
seq_printf(m, "lru entries: %lu\n", lru);
seq_printf(m, "cache hits: %lu\n", hits);
seq_printf(m, "acquisitions: %lu\n", acquisitions);
DEFINE_NFSD_FILE_EVENT(nfsd_file_put_final);
DEFINE_NFSD_FILE_EVENT(nfsd_file_unhash);
DEFINE_NFSD_FILE_EVENT(nfsd_file_put);
-DEFINE_NFSD_FILE_EVENT(nfsd_file_unhash_and_release_locked);
+DEFINE_NFSD_FILE_EVENT(nfsd_file_unhash_and_dispose);
TRACE_EVENT(nfsd_file_acquire,
TP_PROTO(
__entry->nf_file, __entry->status)
);
+TRACE_EVENT(nfsd_file_insert_err,
+ TP_PROTO(
+ const struct svc_rqst *rqstp,
+ const struct inode *inode,
+ unsigned int may_flags,
+ long error
+ ),
+ TP_ARGS(rqstp, inode, may_flags, error),
+ TP_STRUCT__entry(
+ __field(u32, xid)
+ __field(const void *, inode)
+ __field(unsigned long, may_flags)
+ __field(long, error)
+ ),
+ TP_fast_assign(
+ __entry->xid = be32_to_cpu(rqstp->rq_xid);
+ __entry->inode = inode;
+ __entry->may_flags = may_flags;
+ __entry->error = error;
+ ),
+ TP_printk("xid=0x%x inode=%p may_flags=%s error=%ld",
+ __entry->xid, __entry->inode,
+ show_nfsd_may_flags(__entry->may_flags),
+ __entry->error
+ )
+);
+
+TRACE_EVENT(nfsd_file_cons_err,
+ TP_PROTO(
+ const struct svc_rqst *rqstp,
+ const struct inode *inode,
+ unsigned int may_flags,
+ const struct nfsd_file *nf
+ ),
+ TP_ARGS(rqstp, inode, may_flags, nf),
+ TP_STRUCT__entry(
+ __field(u32, xid)
+ __field(const void *, inode)
+ __field(unsigned long, may_flags)
+ __field(unsigned int, nf_ref)
+ __field(unsigned long, nf_flags)
+ __field(unsigned long, nf_may)
+ __field(const void *, nf_file)
+ ),
+ TP_fast_assign(
+ __entry->xid = be32_to_cpu(rqstp->rq_xid);
+ __entry->inode = inode;
+ __entry->may_flags = may_flags;
+ __entry->nf_ref = refcount_read(&nf->nf_ref);
+ __entry->nf_flags = nf->nf_flags;
+ __entry->nf_may = nf->nf_may;
+ __entry->nf_file = nf->nf_file;
+ ),
+ TP_printk("xid=0x%x inode=%p may_flags=%s ref=%u nf_flags=%s nf_may=%s nf_file=%p",
+ __entry->xid, __entry->inode,
+ show_nfsd_may_flags(__entry->may_flags), __entry->nf_ref,
+ show_nf_flags(__entry->nf_flags),
+ show_nfsd_may_flags(__entry->nf_may), __entry->nf_file
+ )
+);
+
TRACE_EVENT(nfsd_file_open,
TP_PROTO(struct nfsd_file *nf, __be32 status),
TP_ARGS(nf, status),
projects / users / hch / dma-mapping.git / commitdiff