Commit eef36cf6 authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

fuse: optmize missing FUSE_LINK support 



If filesystem doesn't support FUSE_LINK (i.e. returns -ENOSYS), then
remember this and next time return immediately, without incurring the
overhead of a round trip to the server.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 83442135

fs/fuse/dir.c

+8 −1
Original line number Diff line number Diff line
@@ -1123,6 +1123,9 @@ static int fuse_link(struct dentry *entry, struct inode *newdir, 
	struct fuse_mount *fm = get_fuse_mount(inode);

	FUSE_ARGS(args);



	if (fm->fc->no_link)

		goto out;



	memset(&inarg, 0, sizeof(inarg));

	inarg.oldnodeid = get_node_id(inode);

	args.opcode = FUSE_LINK;
@@ -1138,7 +1141,11 @@ static int fuse_link(struct dentry *entry, struct inode *newdir, 
		fuse_invalidate_attr(inode);



	if (err == -ENOSYS)

		err = -EPERM;

		fm->fc->no_link = 1;

out:

	if (fm->fc->no_link)

		return -EPERM;



	return err;

}

fs/fuse/fuse_i.h

+3 −0
Original line number Diff line number Diff line
@@ -870,6 +870,9 @@ struct fuse_conn { 
	/* Use pages instead of pointer for kernel I/O */

	unsigned int use_pages_for_kvec_io:1;



	/* Is link not implemented by fs? */

	unsigned int no_link:1;



	/* Use io_uring for communication */

	unsigned int io_uring;