[PATCH 1/3] libnetfs: new user callback: netfs_get_filemap()

[Joan Lledó]

From: Joan Lledó <jlledom@member.fsf.org>

Provide the user with a new callback so they can implement file
mapping over file system nodes.

* libnetfs/netfs.h: Add prototype for netfs_get_filemap
---
 libnetfs/netfs.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libnetfs/netfs.h b/libnetfs/netfs.h
index 38182ab7..96d1eea8 100644
--- a/libnetfs/netfs.h
+++ b/libnetfs/netfs.h
@@ -303,6 +303,12 @@ error_t netfs_get_dirents (struct iouser *cred, struct 
node *dir,
                           mach_msg_type_number_t *datacnt,
                           vm_size_t bufsize, int *amt);
 
+/* The user may define this function. Return a memory object proxy port (send
+   right) for the file contents of NP. PROT is the maximum allowable
+   access. On errors, return MACH_PORT_NULL and set errno.  */
+mach_port_t __attribute__ ((weak))
+netfs_get_filemap (struct node *np, vm_prot_t prot);
+
 /* The user may define this function.  For a full description,
    see hurd/hurd_types.h.  The default response indicates a network
    store.  If the supplied buffers are not large enough, they should
-- 
2.31.1