1 files changed, 32 insertions, 12 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 7e70506297bc..77bcc303c3ae 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -127,7 +127,15 @@ static void fuse_file_put(struct fuse_file *ff, bool sync)
 	if (atomic_dec_and_test(&ff->count)) {
 		struct fuse_req *req = ff->reserved_req;
 
-		if (sync) {
+		if (ff->fc->no_open) {
+			/*
+			 * Drop the release request when client does not
+			 * implement 'open'
+			 */
+			req->background = 0;
+			path_put(&req->misc.release.path);
+			fuse_put_request(ff->fc, req);
+		} else if (sync) {
 			req->background = 0;
 			fuse_request_send(ff->fc, req);
 			path_put(&req->misc.release.path);
@@ -144,27 +152,36 @@ static void fuse_file_put(struct fuse_file *ff, bool sync)
 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
 		 bool isdir)
 {
-	struct fuse_open_out outarg;
 	struct fuse_file *ff;
-	int err;
 	int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
 
 	ff = fuse_file_alloc(fc);
 	if (!ff)
 		return -ENOMEM;
 
-	err = fuse_send_open(fc, nodeid, file, opcode, &outarg);
-	if (err) {
-		fuse_file_free(ff);
-		return err;
+	ff->fh = 0;
+	ff->open_flags = FOPEN_KEEP_CACHE; /* Default for no-open */
+	if (!fc->no_open || isdir) {
+		struct fuse_open_out outarg;
+		int err;
+
+		err = fuse_send_open(fc, nodeid, file, opcode, &outarg);
+		if (!err) {
+			ff->fh = outarg.fh;
+			ff->open_flags = outarg.open_flags;
+
+		} else if (err != -ENOSYS || isdir) {
+			fuse_file_free(ff);
+			return err;
+		} else {
+			fc->no_open = 1;
+		}
 	}
 
 	if (isdir)
-		outarg.open_flags &= ~FOPEN_DIRECT_IO;
+		ff->open_flags &= ~FOPEN_DIRECT_IO;
 
-	ff->fh = outarg.fh;
 	ff->nodeid = nodeid;
-	ff->open_flags = outarg.open_flags;
 	file->private_data = fuse_file_get(ff);
 
 	return 0;
@@ -687,7 +704,7 @@ static int fuse_readpage(struct file *file, struct page *page)
 		SetPageUptodate(page);
 	}
 
-	fuse_invalidate_attr(inode); /* atime changed */
+	fuse_invalidate_atime(inode);
  out:
 	unlock_page(page);
 	return err;
@@ -716,7 +733,7 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
 			fuse_read_update_size(inode, pos,
 					      req->misc.read.attr_ver);
 		}
-		fuse_invalidate_attr(inode); /* atime changed */
+		fuse_invalidate_atime(inode);
 	}
 
 	for (i = 0; i < req->num_pages; i++) {
@@ -2710,6 +2727,9 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 	inode = file->f_mapping->host;
 	i_size = i_size_read(inode);
 
+	if ((rw == READ) && (offset > i_size))
+		return 0;
+
 	/* optimization for short read */
 	if (async_dio && rw != WRITE && offset + count > i_size) {
 		if (offset >= i_size)