349 lines
12 KiB
C
349 lines
12 KiB
C
/****************************************************************************
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* fs/inode/inode.h
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*
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* Copyright (C) 2007, 2009, 2012, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __FS_INODE_H
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#define __FS_INODE_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <dirent.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/compiler.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Inode i_flag values */
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#define FSNODEFLAG_TYPE_MASK 0x00000007 /* Isolates type field */
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#define FSNODEFLAG_TYPE_DRIVER 0x00000000 /* Character driver */
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#define FSNODEFLAG_TYPE_BLOCK 0x00000001 /* Block driver */
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#define FSNODEFLAG_TYPE_MOUNTPT 0x00000002 /* Mount point */
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#define FSNODEFLAG_TYPE_SPECIAL 0x00000004 /* Special OS type */
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#define FSNODEFLAG_TYPE_NAMEDSEM 0x00000004 /* Named semaphore */
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#define FSNODEFLAG_TYPE_MQUEUE 0x00000005 /* Message Queue */
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#define FSNODEFLAG_TYPE_SHM 0x00000006 /* Shared memory region */
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#define FSNODEFLAG_DELETED 0x00000008 /* Unlinked */
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#define INODE_IS_TYPE(i,t) \
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(((i)->i_flags & FSNODEFLAG_TYPE_MASK) == (t))
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#define INODE_IS_SPECIAL(i) \
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(((i)->i_flags & FSNODEFLAG_TYPE_SPECIAL) != 0)
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#define INODE_IS_DRIVER(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_DRIVER)
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#define INODE_IS_BLOCK(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_BLOCK)
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#define INODE_IS_MOUNTPT(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_MOUNTPT)
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#define INODE_IS_NAMEDSEM(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_NAMEDSEM)
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#define INODE_IS_MQUEUE(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_MQUEUE)
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#define INODE_IS_SHM(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_SHM)
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#define INODE_GET_TYPE(i) ((i)->i_flags & FSNODEFLAG_TYPE_MASK)
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#define INODE_SET_TYPE(i,t) \
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do \
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{ \
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(i)->i_flags = ((i)->i_flags & ~FSNODEFLAG_TYPE_MASK) | (t); \
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} \
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while (0)
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#define INODE_SET_DRIVER(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_DRIVER)
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#define INODE_SET_BLOCK(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_BLOCK)
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#define INODE_SET_MOUNTPT(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_MOUNTPT)
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#define INODE_SET_NAMEDSEM(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_NAMEDSEM)
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#define INODE_SET_MQUEUE(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_MQUEUE)
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#define INODE_SET_SHM(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_SHM)
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/* Mountpoint fd_flags values */
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#define DIRENTFLAGS_PSEUDONODE 1
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#define DIRENT_SETPSEUDONODE(f) do (f) |= DIRENTFLAGS_PSEUDONODE; while (0)
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#define DIRENT_ISPSEUDONODE(f) (((f) & DIRENTFLAGS_PSEUDONODE) != 0)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* Callback used by foreach_inode to traverse all inodes in the pseudo-
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* file system.
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*/
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typedef int (*foreach_inode_t)(FAR struct inode *node,
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FAR char dirpath[PATH_MAX],
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FAR void *arg);
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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EXTERN FAR struct inode *root_inode;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* fs_inode.c ***************************************************************/
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/****************************************************************************
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* Name: inode_initialize
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*
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* Description:
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* This is called from the OS initialization logic to configure the file
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* system.
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*
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****************************************************************************/
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void inode_initialize(void);
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/****************************************************************************
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* Name: inode_semtake
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*
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* Description:
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* Get exclusive access to the in-memory inode tree (tree_sem).
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*
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****************************************************************************/
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void inode_semtake(void);
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/****************************************************************************
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* Name: inode_semgive
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*
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* Description:
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* Relinquish exclusive access to the in-memory inode tree (tree_sem).
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*
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****************************************************************************/
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void inode_semgive(void);
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/****************************************************************************
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* Name: inode_search
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*
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* Description:
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* Find the inode associated with 'path' returning the inode references
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* and references to its companion nodes.
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*
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* Assumptions:
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* The caller holds the tree_sem
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*
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****************************************************************************/
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FAR struct inode *inode_search(FAR const char **path,
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FAR struct inode **peer,
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FAR struct inode **parent,
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FAR const char **relpath);
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/****************************************************************************
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* Name: inode_free
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*
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* Description:
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* Free resources used by an inode
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*
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****************************************************************************/
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void inode_free(FAR struct inode *node);
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/****************************************************************************
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* Name: inode_nextname
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*
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* Description:
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* Given a path with node names separated by '/', return the next node
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* name.
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*
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****************************************************************************/
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const char *inode_nextname(FAR const char *name);
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/* fs_inodereserver.c *******************************************************/
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/****************************************************************************
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* Name: inode_reserve
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*
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* Description:
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* Reserve an (initialized) inode the pseudo file system.
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*
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* NOTE: Caller must hold the inode semaphore
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*
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* Input parameters:
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* path - The path to the inode to create
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* inode - The location to return the inode pointer
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*
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* Returned Value:
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* Zero on success (with the inode point in 'inode'); A negated errno
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* value is returned on failure:
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*
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* EINVAL - 'path' is invalid for this operation
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* EEXIST - An inode already exists at 'path'
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* ENOMEM - Failed to allocate in-memory resources for the operation
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*
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****************************************************************************/
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int inode_reserve(FAR const char *path, FAR struct inode **inode);
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/* fs_inoderemove.c *********************************************************/
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/****************************************************************************
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* Name: inode_unlink
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*
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* Description:
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* Given a path, remove a the node from the in-memory, inode tree that the
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* path refers to. This is normally done in preparation to removing or
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* moving an inode.
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*
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* Assumptions/Limitations:
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* The caller must hold the inode semaphore
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*
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****************************************************************************/
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FAR struct inode *inode_unlink(FAR const char *path);
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/****************************************************************************
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* Name: inode_remove
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*
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* Description:
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* Given a path, remove a the node from the in-memory, inode tree that the
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* path refers to and free all resources related to the inode. If the
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* inode is in-use, then it will be unlinked, but will not be freed until
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* the last reference to the inode is released.
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*
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* Assumptions/Limitations:
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* The caller must hold the inode semaphore
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*
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****************************************************************************/
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int inode_remove(FAR const char *path);
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/* fs_inodefind.c ***********************************************************/
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/****************************************************************************
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* Name: inode_find
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*
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* Description:
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* This is called from the open() logic to get a reference to the inode
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* associated with a path.
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*
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****************************************************************************/
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FAR struct inode *inode_find(FAR const char *path, const char **relpath);
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/* fs_inodeaddref.c *********************************************************/
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void inode_addref(FAR struct inode *inode);
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/* fs_inoderelease.c ********************************************************/
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void inode_release(FAR struct inode *inode);
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/* fs_foreachinode.c ********************************************************/
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/****************************************************************************
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* Name: foreach_inode
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*
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* Description:
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* Visit each inode in the pseudo-file system. The traversal is terminated
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* when the callback 'handler' returns a non-zero value, or when all of
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* the inodes have been visited.
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*
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* NOTE 1: Use with caution... The pseudo-file system is locked throughout
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* the traversal.
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* NOTE 2: The search algorithm is recursive and could, in principle, use
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* an indeterminant amount of stack space. This will not usually be a
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* real work issue.
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*
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****************************************************************************/
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int foreach_inode(foreach_inode_t handler, FAR void *arg);
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/* fs_files.c ***************************************************************/
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/****************************************************************************
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* Name: files_initialize
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*
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* Description:
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* This is called from the FS initialization logic to configure the files.
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*
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****************************************************************************/
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void weak_function files_initialize(void);
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/****************************************************************************
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* Name: files_allocate
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*
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* Description:
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* Allocate a struct files instance and associate it with an inode instance.
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* Returns the file descriptor == index into the files array.
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*
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****************************************************************************/
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int files_allocate(FAR struct inode *inode, int oflags, off_t pos, int minfd);
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/****************************************************************************
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* Name: files_close
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*
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* Description:
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* Close an inode (if open)
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*
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* Assumuptions:
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* Caller holds the list semaphore because the file descriptor will be freed.
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*
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****************************************************************************/
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int files_close(int fd);
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/****************************************************************************
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* Name: files_release
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*
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* Assumuptions:
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* Similar to files_close(). Called only from open() logic on error
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* conditions.
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*
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****************************************************************************/
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void files_release(int fd);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __FS_INODE_H */
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