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/* Hurd unionfs
Copyright (C) 2001, 2002, 2005 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. */
/* Underlying filesystem management. */
#ifndef INCLUDED_ULFS_H
#define INCLUDED_ULFS_H
/* The structure for each registered underlying filesystem. */
typedef struct ulfs
{
char *path;
int flags;
int priority;
struct ulfs *next, *prev;
} ulfs_t;
/* Flags. */
/* The according ulfs is marked writable. */
#define FLAG_ULFS_WRITABLE 0x00000001
/* The start of the ulfs chain. */
extern ulfs_t *ulfs_chain_start;
/* The end of the ulfs chain, we need this, to go through the chain in
reversed order. */
extern ulfs_t *ulfs_chain_end;
/* Number of registered underlying filesystems. */
extern unsigned int ulfs_num;
/* The lock protecting the ulfs data structures. */
extern struct mutex ulfs_lock;
/* Register a new underlying filesystem. */
error_t ulfs_register (char *path, int flags, int priority);
/* Unregister an underlying filesystem. */
error_t ulfs_unregister (char *path);
/* Get an ULFS element by it's index. */
error_t ulfs_get_num (int num, ulfs_t **ulfs);
/* Removes invalid ulfs entries. */
void ulfs_check (void);
#define ulfs_iterate \
for (ulfs_t *ulfs = (mutex_lock (&ulfs_lock), \
ulfs_chain_start); \
ulfs || (mutex_unlock (&ulfs_lock), 0); \
ulfs = ulfs->next)
#define ulfs_iterate_unlocked \
for (ulfs_t *ulfs = ulfs_chain_start; \
ulfs; \
ulfs = ulfs->next)
#endif
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