/**************************************************************************** * include/nuttx/fs/dirent.h * * Copyright (C) 2007, 2009, 2011-2012 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 NuttX 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 __INCLUDE_NUTTX_FS_DIRENT_H #define __INCLUDE_NUTTX_FS_DIRENT_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #ifdef CONFIG_NFS # define DIRENT_NFS_MAXHANDLE 64 /* Maximum length of an NFSv3 file handle */ # define DIRENT_NFS_VERFLEN 8 /* Length of the copy verifier */ #endif /**************************************************************************** * 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 pseudo-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_pseudodir_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 { off_t fd_startcluster; /* Start cluster number of the directory */ off_t fd_currcluster; /* Current cluster number being read */ off_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 { off_t fr_firstoffset; /* Offset to the first entry in the directory */ off_t fr_curroffset; /* Current offset into the directory contents */ }; #endif /* CONFIG_FS_ROMFS */ #ifdef CONFIG_APPS_BINDIR /* The apps/ pseudo bin/ directory. The state value is simply an index */ struct fs_binfsdir_s { unsigned int fb_index; /* Index to the next named entry point */ }; #endif #ifdef CONFIG_FS_NXFFS /* NXFFS is the tiny NuttX wear-leveling FLASH file system. The state value is * the offset in FLASH memory to the next inode entry. */ struct fs_nxffsdir_s { off_t nx_offset; /* Offset to the next inode */ }; #endif #ifdef CONFIG_NFS /* The NFS client file system */ struct nfsdir_s { uint8_t nfs_fhsize; /* Length of the file handle */ uint8_t nfs_fhandle[DIRENT_NFS_MAXHANDLE]; /* File handle (max size allocated) */ uint8_t nfs_verifier[DIRENT_NFS_VERFLEN]; /* Cookie verifier */ uint32_t nfs_cookie[2]; /* Cookie */ }; #endif #endif /* CONFIG_DISABLE_MOUNTPOINT */ struct fs_dirent_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 * pseudo root pseudo-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 pseudo-file system */ struct fs_pseudodir_s pseudo; /* 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 #ifdef CONFIG_APPS_BINDIR struct fs_binfsdir_s binfs; #endif #ifdef CONFIG_FS_NXFFS struct fs_nxffsdir_s nxffs; #endif #ifdef CONFIG_NFS struct nfsdir_s nfs; #endif #endif /* !CONFIG_DISABLE_MOUNTPOINT */ } 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 ****************************************************************************/ /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __INCLUDE_NUTTX_FS_DIRENT_H */