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nuttx/fs/fs_internal.h
patacongo ad93759c76 Share block driver helpers outside of fs/ 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1069 42af7a65-404d-4744-a932-0658087f49c3
2008-10-23 20:52:32 +00:00

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/****************************************************************************
* fs_internal.h
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __FS_INTERNAL_H
#define __FS_INTERNAL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/fs.h>
#include <dirent.h>
#include <nuttx/compiler.h>
/****************************************************************************
* Definitions
****************************************************************************/
#define FSNODEFLAG_TYPE_MASK 0x00000003
#define FSNODEFLAG_TYPE_DRIVER 0x00000000
#define FSNODEFLAG_TYPE_BLOCK 0x00000001
#define FSNODEFLAG_TYPE_MOUNTPT 0x00000002
#define FSNODEFLAG_DELETED 0x00000004
#define INODE_IS_DRIVER(i) \
(((i)->i_flags & FSNODEFLAG_TYPE_MASK) == FSNODEFLAG_TYPE_DRIVER)
#define INODE_IS_BLOCK(i) \
(((i)->i_flags & FSNODEFLAG_TYPE_BLOCK) == FSNODEFLAG_TYPE_BLOCK)
#define INODE_IS_MOUNTPT(i) \
(((i)->i_flags & FSNODEFLAG_TYPE_MOUNTPT) == FSNODEFLAG_TYPE_MOUNTPT)
#define INODE_SET_DRIVER(i) \
((i)->i_flags &= ~FSNODEFLAG_TYPE_MASK)
#define INODE_SET_BLOCK(i) \
((i)->i_flags = (((i)->i_flags & ~FSNODEFLAG_TYPE_MASK) | FSNODEFLAG_TYPE_BLOCK))
#define INODE_SET_MOUNTPT(i) \
((i)->i_flags = (((i)->i_flags & ~FSNODEFLAG_TYPE_MASK) | FSNODEFLAG_TYPE_MOUNTPT))
/* Mountpoint fd_flags values */
#define DIRENTFLAGS_PSUEDONODE 1
#define DIRENT_SETPSUEDONODE(f) do (f) |= DIRENTFLAGS_PSUEDONODE; while (0)
#define DIRENT_ISPSUEDONODE(f) (((f) & DIRENTFLAGS_PSUEDONODE) != 0)
/****************************************************************************
* Public Types
****************************************************************************/
/* The internal representation of type DIR is just a container for an inode
* reference, a position, a dirent structure, and file-system-specific
* information.
*
* For the root psuedo-file system, we need retain only the 'next' inode
* need for the next readdir() operation. We hold a reference on this
* inode so we know that it will persist until closedir is called.
*/
struct fs_psuedodir_s
{
struct inode *fd_next; /* The inode for the next call to readdir() */
};
#ifndef CONFIG_DISABLE_MOUNTPOINT
#ifdef CONFIG_FS_FAT
/* For fat, we need to return the start cluster, current cluster, current
* sector and current directory index.
*/
struct fs_fatdir_s
{
uint32 fd_startcluster; /* Start cluster number of the directory */
uint32 fd_currcluster; /* Current cluster number being read */
size_t fd_currsector; /* Current sector being read */
unsigned int fd_index; /* Current index of the directory entry to read */
};
#endif /* CONFIG_FS_FAT */
#ifdef CONFIG_FS_ROMFS
/* For ROMFS, we need to return the offset to the current and start positions
* of the directory entry being read
*/
struct fs_romfsdir_s
{
uint32 fr_firstoffset; /* Offset to the first entry in the directory */
uint32 fr_curroffset; /* Current offset into the directory contents */
};
#endif /* CONFIG_FS_ROMFS */
#endif /* CONFIG_DISABLE_MOUNTPOINT */
struct internal_dir_s
{
/* This is the node that was opened by opendir. The type of the inode
* determines the way that the readdir() operations are performed. For the
* psuedo root psuedo-file system, it is also used to support rewind.
*
* We hold a reference on this inode so we know that it will persist until
* closedir() is called (although inodes linked to this inode may change).
*/
struct inode *fd_root;
/* At present, only mountpoints require special handling flags */
#ifndef CONFIG_DISABLE_MOUNTPOINT
unsigned int fd_flags;
#endif
/* This keeps track of the current directory position for telldir */
off_t fd_position;
/* Retained control information depends on the type of file system that
* provides is provides the mountpoint. Ideally this information should
* be hidden behind an opaque, file-system-dependent void *, but we put
* the private definitions in line here for now to reduce allocations.
*/
union
{
/* Private data used by the built-in psuedo-file system */
struct fs_psuedodir_s psuedo;
/* Private data used by other file systems */
#ifndef CONFIG_DISABLE_MOUNTPOINT
#ifdef CONFIG_FS_FAT
struct fs_fatdir_s fat;
#endif
#ifdef CONFIG_FS_ROMFS
struct fs_romfsdir_s romfs;
#endif
#endif
} u;
/* In any event, this the actual struct dirent that is returned by readdir */
struct dirent fd_dir; /* Populated when readdir is called */
};
/****************************************************************************
* Global Variables
****************************************************************************/
extern FAR struct inode *root_inode;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/* fs_inode.c ***************************************************************/
EXTERN void inode_semtake(void);
EXTERN void inode_semgive(void);
EXTERN FAR struct inode *inode_search(FAR const char **path,
FAR struct inode **peer,
FAR struct inode **parent,
FAR const char **relpath);
EXTERN void inode_free(FAR struct inode *node);
EXTERN const char *inode_nextname(const char *name);
/* fs_inodereserver.c ********************************************************/
EXTERN FAR struct inode *inode_reserve(const char *path);
/* fs_inoderemove.c **********************************************************/
EXTERN STATUS inode_remove(const char *path);
/* fs_inodefind.c ************************************************************/
EXTERN FAR struct inode *inode_find(const char *path, const char **relpath);
/* fs_inodeaddref.c **********************************************************/
EXTERN void inode_addref(FAR struct inode *inode);
/* fs_inoderelease.c *********************************************************/
EXTERN void inode_release(FAR struct inode *inode);
/* fs_files.c ****************************************************************/
EXTERN void weak_function files_initialize(void);
EXTERN int files_allocate(FAR struct inode *inode, int oflags, off_t pos);
EXTERN int files_close(int filedes);
EXTERN void files_release(int filedes);
/* fs_findblockdriver.c ******************************************************/
EXTERN int find_blockdriver(FAR const char *pathname, int mountflags,
FAR struct inode **ppinode);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __FS_INTERNAL_H */
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