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Diffstat (limited to 'node.h')
| -rw-r--r-- | node.h | 118 |
1 files changed, 118 insertions, 0 deletions
@@ -0,0 +1,118 @@ +/* Hurd unionfs + Copyright (C) 2001, 2002 Free Software Foundation, Inc. + Written by Moritz Schulte <moritz@duesseldorf.ccc.de>. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2 of the + License, or * (at your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. */ + +/* node management. */ + +#ifndef INCLUDED_NODE_H +#define INCLUDED_NODE_H + +#include <error.h> +#include <sys/stat.h> +#include <hurd/netfs.h> + +typedef struct node node_t; + +#include "lnode.h" + +/* per-ulfs data for each node. */ +struct node_ulfs +{ + int flags; /* Flags associated for this + underlying filesystem. */ + file_t port; /* A port to the underlying + filesystem. */ +}; +typedef struct node_ulfs node_ulfs_t; + +/* Flags. */ + +/* The according port should not be updated. */ +#define FLAG_NODE_ULFS_FIXED 0x00000001 + +struct netnode +{ + lnode_t *lnode; /* A reference to the according light + node. */ + int flags; /* Associated flags. */ + node_ulfs_t *ulfs; /* Array holding data for each + underlying filesystem. */ + int ulfs_num; /* Number of entries in ULFS. */ + node_t *ncache_next; + node_t *ncache_prev; +}; +typedef struct netnode netnode_t; + +/* Flags. */ +#define FLAG_NODE_INVALIDATE 0x00000001 +#define FLAG_NODE_ULFS_UPTODATE 0x00000002 + +typedef struct node_dirent +{ + struct dirent *dirent; + struct node_dirent *next; +} node_dirent_t; + +/* Create a new node, derived from a light node, add a reference to + the light node. */ +error_t node_create (lnode_t *lnode, node_t **node); + +/* Destroy a node, remove one reference from the associated light + node. */ +void node_destroy (node_t *node); + +/* Make sure that all ports to the underlying filesystems of NODE, + which must be locked, are uptodate. */ +error_t node_update (node_t *node); + +/* Lookup a file named NAME beneath DIR on the underlying filesystems + with FLAGS as openflags. Return the first port successfully looked + up in *PORT and according stat information in *STAT. */ +error_t node_lookup_file (node_t *dir, char *name, int flags, + file_t *port, struct stat *stat); + +/* Initialize per-ulfs data structures for NODE. The ulfs_lock must + be held by the caller. */ +error_t node_ulfs_init (node_t *node); + +/* Read the merged directory entries from NODE, which must be + locked, into *DIRENTS. */ +error_t node_entries_get (node_t *node, node_dirent_t **dirents); + +/* Free DIRENTS. */ +void node_entries_free (node_dirent_t *dirents); + +/* Create the root node (and it's according lnode) and store it in + *ROOT_NODE. */ +error_t node_create_root (node_t **root_node); + +/* Initialize the ports to the underlying filesystems for the root + node. */ +error_t node_init_root (node_t *node); + +/* Return non-zero, if NODE is the root node. */ +#define node_is_root(node) (node)->nn->lnode->dir ? 0 : 1 + +/* Iterate over the per-ulfs data in NODE, which must be locked by the + caller. */ +#define node_ulfs_iterate_unlocked(node) \ + for (node_ulfs_t *node_ulfs = (node)->nn->ulfs; \ + node_ulfs < (node)->nn->ulfs + (node)->nn->ulfs_num; \ + node_ulfs++) + +#endif |