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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [io/] [fileio/] [v2_0/] [include/] [inode.h] - Rev 308
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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 Red Hat, 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., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 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. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-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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