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/* Private data structures for tmpfs.
Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at your option)
any later version.
The GNU Hurd 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 the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef _tmpfs_h
#define _tmpfs_h 1
#include <hurd/diskfs.h>
#include <sys/types.h>
#include <dirent.h>
#include <stdint.h>
struct disknode
{
uint_fast8_t type; /* DT_REG et al */
unsigned int gen;
off_t size;
mode_t mode;
nlink_t nlink;
uid_t uid, author;
gid_t gid;
struct timespec atime, mtime, ctime;
unsigned int flags;
char *trans;
size_t translen;
union
{
char *lnk; /* malloc'd symlink target */
struct
{
mach_port_t memobj;
vm_address_t memref;
unsigned int allocpages; /* largest size while memobj was live */
} reg;
struct
{
struct tmpfs_dirent *entries;
struct disknode *dotdot;
} dir;
dev_t chr, blk;
} u;
struct node *hnext, **hprevp;
};
struct tmpfs_dirent
{
struct tmpfs_dirent *next;
struct disknode *dn;
uint8_t namelen;
char name[0];
};
extern off_t tmpfs_page_limit;
extern mach_port_t default_pager;
/* These two must be accessed using atomic operations. */
extern unsigned int num_files;
extern off_t tmpfs_space_used;
/* Convenience function to adjust tmpfs_space_used. */
static inline void
adjust_used (off_t change)
{
__atomic_add_fetch (&num_files, change, __ATOMIC_RELAXED);
}
/* Convenience function to get tmpfs_space_used. */
static inline off_t
get_used (void)
{
return __atomic_load_n (&num_files, __ATOMIC_RELAXED);
}
#endif
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