fuse: optimize fallocate on permanent failure

If userspace filesystem doesn't support fallocate, remember this and don't send
request next time.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index e3fee88..bbfd571 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2185,6 +2185,9 @@ long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
        };
        int err;
 
+       if (fc->no_fallocate)
+               return -EOPNOTSUPP;
+
        req = fuse_get_req(fc);
        if (IS_ERR(req))
                return PTR_ERR(req);
@@ -2196,6 +2199,10 @@ long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
        req->in.args[0].value = &inarg;
        fuse_request_send(fc, req);
        err = req->out.h.error;
+       if (err == -ENOSYS) {
+               fc->no_fallocate = 1;
+               err = -EOPNOTSUPP;
+       }
        fuse_put_request(fc, req);
 
        return err;

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 572cefc..f38fb79 100644 (file)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -478,6 +478,9 @@ struct fuse_conn {
        /** Are BSD file locking primitives not implemented by fs? */
        unsigned no_flock:1;
 
+       /** Is fallocate not implemented by fs? */
+       unsigned no_fallocate:1;
+
        /** The number of requests waiting for completion */
        atomic_t num_waiting;