fuse: notify: don't move pages

commit 0d2783626a53d4c922f82d51fa675cb5d13f0d36 upstream.

fuse_try_move_page() is not prepared for replacing pages that have already
been read.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Zefan Li <lizefan@huawei.com>

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index f4246cfc8d876db6ac39a6ef058b144c73d503af..8b3fd48a491e250128459aab95fcdd28efa4e62c 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1634,6 +1634,9 @@ copy_finish:
 static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
                       unsigned int size, struct fuse_copy_state *cs)
 {
+       /* Don't try to move pages (yet) */
+       cs->move_pages = 0;
+
        switch (code) {
        case FUSE_NOTIFY_POLL:
                return fuse_notify_poll(fc, size, cs);