/**************************************************************************** * fs_internal.h * * Copyright (C) 2007 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include /**************************************************************************** * 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); /* fs_openblockdriver.c ******************************************************/ EXTERN int open_blockdriver(FAR const char *pathname, int mountflags, FAR struct inode **ppinode); /* fs_closeblockdriver.c *****************************************************/ EXTERN int close_blockdriver(FAR struct inode *inode); #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __FS_INTERNAL_H */