1 files changed, 170 insertions, 148 deletions

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 1998b4d5f692a2..45b2c9e3f63600 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -324,8 +324,7 @@ nfsd_file_alloc(struct nfsd_file_lookup_key *key, unsigned int may)
 		if (key->gc)
 			__set_bit(NFSD_FILE_GC, &nf->nf_flags);
 		nf->nf_inode = key->inode;
-		/* nf_ref is pre-incremented for hash table */
-		refcount_set(&nf->nf_ref, 2);
+		refcount_set(&nf->nf_ref, 1);
 		nf->nf_may = key->need;
 		nf->nf_mark = NULL;
 	}
@@ -377,24 +376,35 @@ nfsd_file_unhash(struct nfsd_file *nf)
 	return false;
 }
 
-static bool
+static void
 nfsd_file_free(struct nfsd_file *nf)
 {
 	s64 age = ktime_to_ms(ktime_sub(ktime_get(), nf->nf_birthtime));
-	bool flush = false;
 
 	trace_nfsd_file_free(nf);
 
 	this_cpu_inc(nfsd_file_releases);
 	this_cpu_add(nfsd_file_total_age, age);
 
+	nfsd_file_unhash(nf);
+
+	/*
+	 * We call fsync here in order to catch writeback errors. It's not
+	 * strictly required by the protocol, but an nfsd_file could get
+	 * evicted from the cache before a COMMIT comes in. If another
+	 * task were to open that file in the interim and scrape the error,
+	 * then the client may never see it. By calling fsync here, we ensure
+	 * that writeback happens before the entry is freed, and that any
+	 * errors reported result in the write verifier changing.
+	 */
+	nfsd_file_fsync(nf);
+
 	if (nf->nf_mark)
 		nfsd_file_mark_put(nf->nf_mark);
 	if (nf->nf_file) {
 		get_file(nf->nf_file);
 		filp_close(nf->nf_file, NULL);
 		fput(nf->nf_file);
-		flush = true;
 	}
 
 	/*
@@ -402,10 +412,9 @@ nfsd_file_free(struct nfsd_file *nf)
 	 * WARN and leak it to preserve system stability.
 	 */
 	if (WARN_ON_ONCE(!list_empty(&nf->nf_lru)))
-		return flush;
+		return;
 
 	call_rcu(&nf->nf_rcu, nfsd_file_slab_free);
-	return flush;
 }
 
 static bool
@@ -421,17 +430,23 @@ nfsd_file_check_writeback(struct nfsd_file *nf)
 		mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK);
 }
 
-static void nfsd_file_lru_add(struct nfsd_file *nf)
+static bool nfsd_file_lru_add(struct nfsd_file *nf)
 {
 	set_bit(NFSD_FILE_REFERENCED, &nf->nf_flags);
-	if (list_lru_add(&nfsd_file_lru, &nf->nf_lru))
+	if (list_lru_add(&nfsd_file_lru, &nf->nf_lru)) {
 		trace_nfsd_file_lru_add(nf);
+		return true;
+	}
+	return false;
 }
 
-static void nfsd_file_lru_remove(struct nfsd_file *nf)
+static bool nfsd_file_lru_remove(struct nfsd_file *nf)
 {
-	if (list_lru_del(&nfsd_file_lru, &nf->nf_lru))
+	if (list_lru_del(&nfsd_file_lru, &nf->nf_lru)) {
 		trace_nfsd_file_lru_del(nf);
+		return true;
+	}
+	return false;
 }
 
 struct nfsd_file *
@@ -442,86 +457,60 @@ nfsd_file_get(struct nfsd_file *nf)
 	return NULL;
 }
 
-static void
-nfsd_file_unhash_and_queue(struct nfsd_file *nf, struct list_head *dispose)
-{
-	trace_nfsd_file_unhash_and_queue(nf);
-	if (nfsd_file_unhash(nf)) {
-		/* caller must call nfsd_file_dispose_list() later */
-		nfsd_file_lru_remove(nf);
-		list_add(&nf->nf_lru, dispose);
-	}
-}
-
-static void
-nfsd_file_put_noref(struct nfsd_file *nf)
-{
-	trace_nfsd_file_put(nf);
-
-	if (refcount_dec_and_test(&nf->nf_ref)) {
-		WARN_ON(test_bit(NFSD_FILE_HASHED, &nf->nf_flags));
-		nfsd_file_lru_remove(nf);
-		nfsd_file_free(nf);
-	}
-}
-
-static void
-nfsd_file_unhash_and_put(struct nfsd_file *nf)
-{
-	if (nfsd_file_unhash(nf))
-		nfsd_file_put_noref(nf);
-}
-
+/**
+ * nfsd_file_put - put the reference to a nfsd_file
+ * @nf: nfsd_file of which to put the reference
+ *
+ * Put a reference to a nfsd_file. In the non-GC case, we just put the
+ * reference immediately. In the GC case, if the reference would be
+ * the last one, the put it on the LRU instead to be cleaned up later.
+ */
 void
 nfsd_file_put(struct nfsd_file *nf)
 {
 	might_sleep();
+	trace_nfsd_file_put(nf);
 
-	if (test_bit(NFSD_FILE_GC, &nf->nf_flags))
-		nfsd_file_lru_add(nf);
-	else if (refcount_read(&nf->nf_ref) == 2)
-		nfsd_file_unhash_and_put(nf);
-
-	if (!test_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
-		nfsd_file_fsync(nf);
-		nfsd_file_put_noref(nf);
-	} else if (nf->nf_file && test_bit(NFSD_FILE_GC, &nf->nf_flags)) {
-		nfsd_file_put_noref(nf);
-		nfsd_file_schedule_laundrette();
-	} else
-		nfsd_file_put_noref(nf);
-}
-
-static void
-nfsd_file_dispose_list(struct list_head *dispose)
-{
-	struct nfsd_file *nf;
+	if (test_bit(NFSD_FILE_GC, &nf->nf_flags) &&
+	    test_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
+		/*
+		 * If this is the last reference (nf_ref == 1), then try to
+		 * transfer it to the LRU.
+		 */
+		if (refcount_dec_not_one(&nf->nf_ref))
+			return;
+
+		/* Try to add it to the LRU.  If that fails, decrement. */
+		if (nfsd_file_lru_add(nf)) {
+			/* If it's still hashed, we're done */
+			if (test_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
+				nfsd_file_schedule_laundrette();
+				return;
+			}
 
-	while(!list_empty(dispose)) {
-		nf = list_first_entry(dispose, struct nfsd_file, nf_lru);
-		list_del_init(&nf->nf_lru);
-		nfsd_file_fsync(nf);
-		nfsd_file_put_noref(nf);
+			/*
+			 * We're racing with unhashing, so try to remove it from
+			 * the LRU. If removal fails, then someone else already
+			 * has our reference.
+			 */
+			if (!nfsd_file_lru_remove(nf))
+				return;
+		}
 	}
+	if (refcount_dec_and_test(&nf->nf_ref))
+		nfsd_file_free(nf);
 }
 
 static void
-nfsd_file_dispose_list_sync(struct list_head *dispose)
+nfsd_file_dispose_list(struct list_head *dispose)
 {
-	bool flush = false;
 	struct nfsd_file *nf;
 
-	while(!list_empty(dispose)) {
+	while (!list_empty(dispose)) {
 		nf = list_first_entry(dispose, struct nfsd_file, nf_lru);
 		list_del_init(&nf->nf_lru);
-		nfsd_file_fsync(nf);
-		if (!refcount_dec_and_test(&nf->nf_ref))
-			continue;
-		if (nfsd_file_free(nf))
-			flush = true;
+		nfsd_file_free(nf);
 	}
-	if (flush)
-		flush_delayed_fput();
 }
 
 static void
@@ -591,21 +580,8 @@ nfsd_file_lru_cb(struct list_head *item, struct list_lru_one *lru,
 	struct list_head *head = arg;
 	struct nfsd_file *nf = list_entry(item, struct nfsd_file, nf_lru);
 
-	/*
-	 * Do a lockless refcount check. The hashtable holds one reference, so
-	 * we look to see if anything else has a reference, or if any have
-	 * been put since the shrinker last ran. Those don't get unhashed and
-	 * released.
-	 *
-	 * Note that in the put path, we set the flag and then decrement the
-	 * counter. Here we check the counter and then test and clear the flag.
-	 * That order is deliberate to ensure that we can do this locklessly.
-	 */
-	if (refcount_read(&nf->nf_ref) > 1) {
-		list_lru_isolate(lru, &nf->nf_lru);
-		trace_nfsd_file_gc_in_use(nf);
-		return LRU_REMOVED;
-	}
+	/* We should only be dealing with GC entries here */
+	WARN_ON_ONCE(!test_bit(NFSD_FILE_GC, &nf->nf_flags));
 
 	/*
 	 * Don't throw out files that are still undergoing I/O or
@@ -616,40 +592,30 @@ nfsd_file_lru_cb(struct list_head *item, struct list_lru_one *lru,
 		return LRU_SKIP;
 	}
 
+	/* If it was recently added to the list, skip it */
 	if (test_and_clear_bit(NFSD_FILE_REFERENCED, &nf->nf_flags)) {
 		trace_nfsd_file_gc_referenced(nf);
 		return LRU_ROTATE;
 	}
 
-	if (!test_and_clear_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
-		trace_nfsd_file_gc_hashed(nf);
-		return LRU_SKIP;
+	/*
+	 * Put the reference held on behalf of the LRU. If it wasn't the last
+	 * one, then just remove it from the LRU and ignore it.
+	 */
+	if (!refcount_dec_and_test(&nf->nf_ref)) {
+		trace_nfsd_file_gc_in_use(nf);
+		list_lru_isolate(lru, &nf->nf_lru);
+		return LRU_REMOVED;
 	}
 
+	/* Refcount went to zero. Unhash it and queue it to the dispose list */
+	nfsd_file_unhash(nf);
 	list_lru_isolate_move(lru, &nf->nf_lru, head);
 	this_cpu_inc(nfsd_file_evictions);
 	trace_nfsd_file_gc_disposed(nf);
 	return LRU_REMOVED;
 }
 
-/*
- * Unhash items on @dispose immediately, then queue them on the
- * disposal workqueue to finish releasing them in the background.
- *
- * cel: Note that between the time list_lru_shrink_walk runs and
- * now, these items are in the hash table but marked unhashed.
- * Why release these outside of lru_cb ? There's no lock ordering
- * problem since lru_cb currently takes no lock.
- */
-static void nfsd_file_gc_dispose_list(struct list_head *dispose)
-{
-	struct nfsd_file *nf;
-
-	list_for_each_entry(nf, dispose, nf_lru)
-		nfsd_file_hash_remove(nf);
-	nfsd_file_dispose_list_delayed(dispose);
-}
-
 static void
 nfsd_file_gc(void)
 {
@@ -659,7 +625,7 @@ nfsd_file_gc(void)
 	ret = list_lru_walk(&nfsd_file_lru, nfsd_file_lru_cb,
 			    &dispose, list_lru_count(&nfsd_file_lru));
 	trace_nfsd_file_gc_removed(ret, list_lru_count(&nfsd_file_lru));
-	nfsd_file_gc_dispose_list(&dispose);
+	nfsd_file_dispose_list_delayed(&dispose);
 }
 
 static void
@@ -685,7 +651,7 @@ nfsd_file_lru_scan(struct shrinker *s, struct shrink_control *sc)
 	ret = list_lru_shrink_walk(&nfsd_file_lru, sc,
 				   nfsd_file_lru_cb, &dispose);
 	trace_nfsd_file_shrinker_removed(ret, list_lru_count(&nfsd_file_lru));
-	nfsd_file_gc_dispose_list(&dispose);
+	nfsd_file_dispose_list_delayed(&dispose);
 	return ret;
 }
 
@@ -695,72 +661,111 @@ static struct shrinker	nfsd_file_shrinker = {
 	.seeks = 1,
 };
 
-/*
- * Find all cache items across all net namespaces that match @inode and
- * move them to @dispose. The lookup is atomic wrt nfsd_file_acquire().
+/**
+ * nfsd_file_queue_for_close: try to close out any open nfsd_files for an inode
+ * @inode:   inode on which to close out nfsd_files
+ * @dispose: list on which to gather nfsd_files to close out
+ *
+ * An nfsd_file represents a struct file being held open on behalf of nfsd. An
+ * open file however can block other activity (such as leases), or cause
+ * undesirable behavior (e.g. spurious silly-renames when reexporting NFS).
+ *
+ * This function is intended to find open nfsd_files when this sort of
+ * conflicting access occurs and then attempt to close those files out.
+ *
+ * Populates the dispose list with entries that have already had their
+ * refcounts go to zero. The actual free of an nfsd_file can be expensive,
+ * so we leave it up to the caller whether it wants to wait or not.
  */
-static unsigned int
-__nfsd_file_close_inode(struct inode *inode, struct list_head *dispose)
+static void
+nfsd_file_queue_for_close(struct inode *inode, struct list_head *dispose)
 {
 	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 {
+		int decrement = 1;
+
 		nf = rhashtable_lookup(&nfsd_file_rhash_tbl, &key,
 				       nfsd_file_rhash_params);
 		if (!nf)
 			break;
-		nfsd_file_unhash_and_queue(nf, dispose);
-		count++;
+
+		/* If we raced with someone else unhashing, ignore it */
+		if (!nfsd_file_unhash(nf))
+			continue;
+
+		/* If we can't get a reference, ignore it */
+		if (!nfsd_file_get(nf))
+			continue;
+
+		/* Extra decrement if we remove from the LRU */
+		if (nfsd_file_lru_remove(nf))
+			++decrement;
+
+		/* If refcount goes to 0, then put on the dispose list */
+		if (refcount_sub_and_test(decrement, &nf->nf_ref)) {
+			list_add(&nf->nf_lru, dispose);
+			trace_nfsd_file_closing(nf);
+		}
 	} while (1);
 	rcu_read_unlock();
-	return count;
 }
 
 /**
- * nfsd_file_close_inode_sync - attempt to forcibly close a nfsd_file
+ * nfsd_file_close_inode - attempt a delayed close of a nfsd_file
  * @inode: inode of the file to attempt to remove
  *
- * Unhash and put, then flush and fput all cache items associated with @inode.
+ * Close out any open nfsd_files that can be reaped for @inode. The
+ * actual freeing is deferred to the dispose_list_delayed infrastructure.
+ *
+ * This is used by the fsnotify callbacks and setlease notifier.
  */
-void
-nfsd_file_close_inode_sync(struct inode *inode)
+static void
+nfsd_file_close_inode(struct inode *inode)
 {
 	LIST_HEAD(dispose);
-	unsigned int count;
 
-	count = __nfsd_file_close_inode(inode, &dispose);
-	trace_nfsd_file_close_inode_sync(inode, count);
-	nfsd_file_dispose_list_sync(&dispose);
+	nfsd_file_queue_for_close(inode, &dispose);
+	nfsd_file_dispose_list_delayed(&dispose);
 }
 
 /**
- * nfsd_file_close_inode - attempt a delayed close of a nfsd_file
+ * nfsd_file_close_inode_sync - attempt to forcibly close a nfsd_file
  * @inode: inode of the file to attempt to remove
  *
- * Unhash and put all cache item associated with @inode.
+ * Close out any open nfsd_files that can be reaped for @inode. The
+ * nfsd_files are closed out synchronously.
+ *
+ * This is called from nfsd_rename and nfsd_unlink to avoid silly-renames
+ * when reexporting NFS.
  */
-static void
-nfsd_file_close_inode(struct inode *inode)
+void
+nfsd_file_close_inode_sync(struct inode *inode)
 {
+	struct nfsd_file *nf;
 	LIST_HEAD(dispose);
-	unsigned int count;
 
-	count = __nfsd_file_close_inode(inode, &dispose);
-	trace_nfsd_file_close_inode(inode, count);
-	nfsd_file_dispose_list_delayed(&dispose);
+	trace_nfsd_file_close(inode);
+
+	nfsd_file_queue_for_close(inode, &dispose);
+	while (!list_empty(&dispose)) {
+		nf = list_first_entry(&dispose, struct nfsd_file, nf_lru);
+		list_del_init(&nf->nf_lru);
+		nfsd_file_free(nf);
+	}
+	flush_delayed_fput();
 }
 
 /**
  * nfsd_file_delayed_close - close unused nfsd_files
  * @work: dummy
  *
- * Walk the LRU list and close any entries that have not been used since
+ * Walk the LRU list and destroy any entries that have not been used since
  * the last scan.
  */
 static void
@@ -782,7 +787,7 @@ nfsd_file_lease_notifier_call(struct notifier_block *nb, unsigned long arg,
 
 	/* Only close files for F_SETLEASE leases */
 	if (fl->fl_flags & FL_LEASE)
-		nfsd_file_close_inode_sync(file_inode(fl->fl_file));
+		nfsd_file_close_inode(file_inode(fl->fl_file));
 	return 0;
 }
 
@@ -903,6 +908,13 @@ out_err:
 	goto out;
 }
 
+/**
+ * __nfsd_file_cache_purge: clean out the cache for shutdown
+ * @net: net-namespace to shut down the cache (may be NULL)
+ *
+ * Walk the nfsd_file cache and close out any that match @net. If @net is NULL,
+ * then close out everything. Called when an nfsd instance is being shut down.
+ */
 static void
 __nfsd_file_cache_purge(struct net *net)
 {
@@ -916,8 +928,11 @@ __nfsd_file_cache_purge(struct net *net)
 
 		nf = rhashtable_walk_next(&iter);
 		while (!IS_ERR_OR_NULL(nf)) {
-			if (!net || nf->nf_net == net)
-				nfsd_file_unhash_and_queue(nf, &dispose);
+			if (!net || nf->nf_net == net) {
+				nfsd_file_unhash(nf);
+				nfsd_file_lru_remove(nf);
+				list_add(&nf->nf_lru, &dispose);
+			}
 			nf = rhashtable_walk_next(&iter);
 		}
 
@@ -1084,8 +1099,12 @@ retry:
 	if (nf)
 		nf = nfsd_file_get(nf);
 	rcu_read_unlock();
-	if (nf)
+
+	if (nf) {
+		if (nfsd_file_lru_remove(nf))
+			WARN_ON_ONCE(refcount_dec_and_test(&nf->nf_ref));
 		goto wait_for_construction;
+	}
 
 	nf = nfsd_file_alloc(&key, may_flags);
 	if (!nf) {
@@ -1118,11 +1137,11 @@ wait_for_construction:
 			goto out;
 		}
 		open_retry = false;
-		nfsd_file_put_noref(nf);
+		if (refcount_dec_and_test(&nf->nf_ref))
+			nfsd_file_free(nf);
 		goto retry;
 	}
 
-	nfsd_file_lru_remove(nf);
 	this_cpu_inc(nfsd_file_cache_hits);
 
 	status = nfserrno(nfsd_open_break_lease(file_inode(nf->nf_file), may_flags));
@@ -1132,7 +1151,8 @@ out:
 			this_cpu_inc(nfsd_file_acquisitions);
 		*pnf = nf;
 	} else {
-		nfsd_file_put(nf);
+		if (refcount_dec_and_test(&nf->nf_ref))
+			nfsd_file_free(nf);
 		nf = NULL;
 	}
 
@@ -1158,8 +1178,10 @@ open_file:
 	 * If construction failed, or we raced with a call to unlink()
 	 * then unhash.
 	 */
-	if (status != nfs_ok || key.inode->i_nlink == 0)
-		nfsd_file_unhash_and_put(nf);
+	if (status == nfs_ok && key.inode->i_nlink == 0)
+		status = nfserr_jukebox;
+	if (status != nfs_ok)
+		nfsd_file_unhash(nf);
 	clear_bit_unlock(NFSD_FILE_PENDING, &nf->nf_flags);
 	smp_mb__after_atomic();
 	wake_up_bit(&nf->nf_flags, NFSD_FILE_PENDING);