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>

2 files changed, 10 insertions, 0 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index e3fee88831d4..bbfd571b37e1 100644
--- 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 572cefc78012..f38fb795f03c 100644
--- 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;