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#ifndef CYGONCE_IO_FILEIO_INODE_H
#define CYGONCE_IO_FILEIO_INODE_H
//=============================================================================
//
// inode.h
//
// Header describing eCos inodes
//
//=============================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors:
// Date: 2002-01-18
// Purpose: Describe inodes
// Description: This header contains the definitions that may be useful to a
// filesystem implementation with the concept of inodes.
// There should remain no *requirement* for a FS to use inodes.
// Instead these are just useful functions and definitions.
//
// Usage:
// #include <cyg/fileio/inode.h>
// ...
//
//
//####DESCRIPTIONEND####
//
//=============================================================================
#include <cyg/infra/cyg_type.h>
#include <sys/types.h>
#include <time.h> // time_t
#include <cyg/fileio/fileio.h>
#include <cyg/io/io.h>
#include <limits.h>
// some members are named for compatibility for Linux inodes
typedef struct CYG_INODE_TAG {
cyg_uint32 i_ino; // inode number
mode_t i_mode; // mode
nlink_t i_nlink; // number of (hard) links
uid_t i_uid; // UID
gid_t i_gid; // GID
cyg_io_handle_t i_device; // underlying device
off_t i_size; // file size
time_t i_atime; // file access time
time_t i_mtime; // file modification time
time_t i_ctime; // file metadata change time
struct CYG_INODE_TAG *i_parent; // parent inode
// these duplicate the contents of a cyg_file, but that's okay
cyg_mtab_entry* i_mte; // mount table entry
struct CYG_FILEOPS_TAG *i_fop; // file operations
// inode cache related members
cyg_atomic i_count; // number of references to this inode
struct CYG_INODE_TAG *i_cache_prev; // previous in icache
struct CYG_INODE_TAG *i_cache_next; // next in icache
// This allows us to use a GCC extension to extend the size as appropriate
// for individual FS's requirements.
// Obviously anything here cannot be shared between FSs.
CYG_ADDRWORD i_private[];
} cyg_inode;
// There should be one cyg_inodecache per FS instance (to preserve inode number
// uniqueness)
typedef void (*cyg_inodecache_freecallback_t)( cyg_inode *);
typedef struct {
cyg_inode *head;
#if CYGNUM_IO_FILEIO_MAX_INODE_CACHE_DEAD > 0
cyg_inode *freeable;
cyg_atomic freeablelistlen;
#endif
cyg_inodecache_freecallback_t freecallback;
size_t privatespace;
// should be some locking eventually
} cyg_inodecache;
static __inline__ int
cyg_inodecache_init( cyg_inodecache *ic, size_t extraprivatespace,
cyg_inodecache_freecallback_t freecb )
{
ic->head = NULL;
#if CYGNUM_IO_FILEIO_MAX_INODE_CACHE_DEAD > 0
ic->freeable = NULL;
ic->freeablelistlen = 0;
#endif
ic->privatespace = extraprivatespace;
ic->freecallback = freecb;
return 0;
}
// Create an inode, with extra private space. Returns NULL on error.
__externC cyg_inode *
cyg_inode_create( cyg_inodecache *ic );
__externC cyg_inode *
cyg_inode_get( cyg_inodecache *ic, cyg_uint32 ino );
__externC void
cyg_inode_put( cyg_inodecache *ic, cyg_inode *ino );
__externC void
cyg_inodecache_destroy( cyg_inodecache *ic );
#endif // CYGONCE_IO_FILEIO_INODE_H
// EOF inode.h
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