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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [imfs.h] - Rev 30
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/* * Header file for the In-Memory File System * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: imfs.h,v 1.2 2001-09-27 12:01:15 chris Exp $ */ #ifndef __IMFS_h #define __IMFS_h #ifdef __cplusplus extern "C" { #endif #include <rtems.h> #include <chain.h> #include <sys/types.h> #include <limits.h> #include <rtems/libio.h> /* * File name macros */ #define IMFS_is_valid_name_char( _ch ) ( 1 ) #define IMFS_is_separator( _ch ) \ rtems_filesystem_is_separator( _ch ) /* * Data types */ struct IMFS_jnode_tt; typedef struct IMFS_jnode_tt IMFS_jnode_t; typedef struct { Chain_Control Entries; rtems_filesystem_mount_table_entry_t *mt_fs; } IMFS_directory_t; typedef struct { rtems_device_major_number major; rtems_device_minor_number minor; } IMFS_device_t; typedef struct { IMFS_jnode_t *link_node; } IMFS_link_t; typedef struct { const char *name; } IMFS_sym_link_t; /* * IMFS "memfile" information * * The data structure for the in-memory "memfiles" is based on classic UNIX. * * block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in * length which could be data or a table of pointers to blocks. * * Setting IMFS_MEMFILE_BYTES_PER_BLOCK to different values has a significant * impact on the maximum file size supported as well as the amount of * memory wasted due to internal file fragmentation. The following * is a list of maximum file sizes based on various settings * * max_filesize with blocks of 16 is 1,328 * max_filesize with blocks of 32 is 18,656 * max_filesize with blocks of 64 is 279,488 * max_filesize with blocks of 128 is 4,329,344 * max_filesize with blocks of 256 is 68,173,568 * max_filesize with blocks of 512 is 1,082,195,456 */ #define IMFS_MEMFILE_BYTES_PER_BLOCK 128 #define IMFS_MEMFILE_BLOCK_SLOTS \ (IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *)) typedef unsigned char * block_p; typedef block_p *block_ptr; typedef struct { off_t size; /* size of file in bytes */ block_ptr indirect; /* array of 128 data blocks pointers */ block_ptr doubly_indirect; /* 128 indirect blocks */ block_ptr triply_indirect; /* 128 doubly indirect blocks */ } IMFS_memfile_t; /* * Important block numbers for "memfiles" */ #define FIRST_INDIRECT (0) #define LAST_INDIRECT (IMFS_MEMFILE_BLOCK_SLOTS - 1) #define FIRST_DOUBLY_INDIRECT (LAST_INDIRECT + 1) #define LAST_DOUBLY_INDIRECT \ (LAST_INDIRECT + \ (IMFS_MEMFILE_BLOCK_SLOTS * IMFS_MEMFILE_BLOCK_SLOTS)) #define FIRST_TRIPLY_INDIRECT (LAST_DOUBLY_INDIRECT + 1) #define LAST_TRIPLY_INDIRECT \ (LAST_DOUBLY_INDIRECT +\ (IMFS_MEMFILE_BLOCK_SLOTS * \ IMFS_MEMFILE_BLOCK_SLOTS * IMFS_MEMFILE_BLOCK_SLOTS)) #define IMFS_MEMFILE_MAXIMUM_SIZE \ (LAST_TRIPLY_INDIRECT * IMFS_MEMFILE_BYTES_PER_BLOCK) /* * What types of IMFS file systems entities there can be. */ #define IMFS_jnode_types_t rtems_filesystem_node_types_t #define IMFS_DIRECTORY RTEMS_FILESYSTEM_DIRECTORY #define IMFS_DEVICE RTEMS_FILESYSTEM_DEVICE #define IMFS_HARD_LINK RTEMS_FILESYSTEM_HARD_LINK #define IMFS_SYM_LINK RTEMS_FILESYSTEM_SYM_LINK #define IMFS_MEMORY_FILE RTEMS_FILESYSTEM_MEMORY_FILE #define IMFS_NUMBER_OF_TYPES (IMFS_MEMORY_FILE + 1) typedef union { IMFS_directory_t directory; IMFS_device_t device; IMFS_link_t hard_link; IMFS_sym_link_t sym_link; IMFS_memfile_t file; } IMFS_types_union; /* * Maximum length of a "basename" of an IMFS file/node. */ #define IMFS_NAME_MAX 32 /* * The control structure for an IMFS jnode. */ struct IMFS_jnode_tt { Chain_Node Node; /* for chaining them together */ IMFS_jnode_t *Parent; /* Parent node */ char name[IMFS_NAME_MAX+1]; /* "basename" */ mode_t st_mode; /* File mode */ nlink_t st_nlink; /* Link count */ ino_t st_ino; /* inode */ uid_t st_uid; /* User ID of owner */ gid_t st_gid; /* Group ID of owner */ time_t stat_atime; /* Time of last access */ time_t stat_mtime; /* Time of last modification */ time_t stat_ctime; /* Time of last status change */ IMFS_jnode_types_t type; /* Type of this entry */ IMFS_types_union info; }; #define IMFS_update_atime( _jnode ) \ do { \ struct timeval tv; \ gettimeofday( &tv, 0 ); \ _jnode->stat_atime = (time_t) tv.tv_sec; \ } while (0) #define IMFS_update_mtime( _jnode ) \ do { \ struct timeval tv; \ gettimeofday( &tv, 0 ); \ _jnode->stat_mtime = (time_t) tv.tv_sec; \ } while (0) #define IMFS_update_ctime( _jnode ) \ do { \ struct timeval tv; \ gettimeofday( &tv, 0 ); \ _jnode->stat_ctime = (time_t) tv.tv_sec; \ } while (0) #define IMFS_atime_mtime_update( _jnode ) \ do { \ struct timeval tv; \ gettimeofday( &tv, 0 ); \ _jnode->stat_mtime = (time_t) tv.tv_sec; \ _jnode->stat_atime = (time_t) tv.tv_sec; \ } while (0) typedef struct { ino_t ino_count; rtems_filesystem_file_handlers_r *memfile_handlers; rtems_filesystem_file_handlers_r *directory_handlers; } IMFS_fs_info_t; #define increment_and_check_linkcounts( _fs_info ) \ ((IMFS_fs_info_t * )_fs_info)->link_counts++; \ if ( ((IMFS_fs_info_t * )_fs_info)->link_counts > MAXSYMLINKS ) \ set_errno_and_return_minus_one( ELOOP ) #define decrement_linkcounts( _fs_info ) \ ((IMFS_fs_info_t * )_fs_info)->link_counts--; /* * Type defination for tokens returned from IMFS_get_token */ typedef enum { IMFS_NO_MORE_PATH, IMFS_CURRENT_DIR, IMFS_UP_DIR, IMFS_NAME, IMFS_INVALID_TOKEN } IMFS_token_types; /* * Shared Data */ extern rtems_filesystem_file_handlers_r IMFS_directory_handlers; extern rtems_filesystem_file_handlers_r IMFS_device_handlers; extern rtems_filesystem_file_handlers_r IMFS_link_handlers; extern rtems_filesystem_file_handlers_r IMFS_memfile_handlers; extern rtems_filesystem_operations_table IMFS_ops; extern rtems_filesystem_operations_table miniIMFS_ops; extern rtems_filesystem_limits_and_options_t IMFS_LIMITS_AND_OPTIONS; /* * Routines */ int IMFS_initialize( rtems_filesystem_mount_table_entry_t *mt_entry ); int miniIMFS_initialize( rtems_filesystem_mount_table_entry_t *mt_entry ); int IMFS_initialize_support( rtems_filesystem_mount_table_entry_t *mt_entry, rtems_filesystem_operations_table *op_table, rtems_filesystem_file_handlers_r *memfile_handlers, rtems_filesystem_file_handlers_r *directory_handlers ); int IMFS_fsunmount( rtems_filesystem_mount_table_entry_t *mt_entry ); /* * Returns the number of characters copied from path to token. */ IMFS_token_types IMFS_get_token( const char *path, char *token, int *token_len ); void IMFS_dump( void ); void IMFS_initialize_jnode( IMFS_jnode_t *the_jnode, IMFS_jnode_types_t type, IMFS_jnode_t *the_parent, char *name, mode_t mode ); IMFS_jnode_t *IMFS_find_match_in_dir( IMFS_jnode_t *directory, /* IN */ char *name /* IN */ ); rtems_filesystem_node_types_t IMFS_node_type( rtems_filesystem_location_info_t *pathloc /* IN */ ); int IMFS_stat( rtems_filesystem_location_info_t *loc, /* IN */ struct stat *buf /* OUT */ ); int IMFS_Set_handlers( rtems_filesystem_location_info_t *loc ); int IMFS_evaluate_link( rtems_filesystem_location_info_t *node, /* IN/OUT */ int flags /* IN */ ); int IMFS_eval_path( const char *pathname, /* IN */ int flags, /* IN */ rtems_filesystem_location_info_t *pathloc /* IN/OUT */ ); int IMFS_link( rtems_filesystem_location_info_t *to_loc, /* IN */ rtems_filesystem_location_info_t *parent_loc, /* IN */ const char *token /* IN */ ); int IMFS_unlink( rtems_filesystem_location_info_t *pathloc /* IN */ ); int IMFS_chown( rtems_filesystem_location_info_t *pathloc, /* IN */ uid_t owner, /* IN */ gid_t group /* IN */ ); int IMFS_freenodinfo( rtems_filesystem_location_info_t *pathloc /* IN */ ); int IMFS_mknod( const char *path, /* IN */ mode_t mode, /* IN */ dev_t dev, /* IN */ rtems_filesystem_location_info_t *pathloc /* IN/OUT */ ); IMFS_jnode_t *IMFS_create_node( rtems_filesystem_location_info_t *parent_loc, /* IN */ IMFS_jnode_types_t type, /* IN */ char *name, /* IN */ mode_t mode, /* IN */ IMFS_types_union *info /* IN */ ); int IMFS_evaluate_for_make( const char *path, /* IN */ rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ const char **name /* OUT */ ); int IMFS_mount( rtems_filesystem_mount_table_entry_t *mt_entry /* IN */ ); int IMFS_unmount( rtems_filesystem_mount_table_entry_t *mt_entry /* IN */ ); int IMFS_freenod( rtems_filesystem_location_info_t *node /* IN/OUT */ ); int IMFS_memfile_remove( IMFS_jnode_t *the_jnode /* IN/OUT */ ); int memfile_ftruncate( rtems_libio_t *iop, /* IN */ off_t length /* IN */ ); int imfs_dir_open( rtems_libio_t *iop, /* IN */ const char *pathname, /* IN */ unsigned32 flag, /* IN */ unsigned32 mode /* IN */ ); int imfs_dir_close( rtems_libio_t *iop /* IN */ ); int imfs_dir_read( rtems_libio_t *iop, /* IN */ void *buffer, /* IN */ unsigned32 count /* IN */ ); int imfs_dir_lseek( rtems_libio_t *iop, /* IN */ off_t offset, /* IN */ int whence /* IN */ ); int imfs_dir_fstat( rtems_filesystem_location_info_t *loc, /* IN */ struct stat *buf /* OUT */ ); int imfs_dir_rmnod( rtems_filesystem_location_info_t *pathloc /* IN */ ); int memfile_open( rtems_libio_t *iop, /* IN */ const char *pathname, /* IN */ unsigned32 flag, /* IN */ unsigned32 mode /* IN */ ); int memfile_close( rtems_libio_t *iop /* IN */ ); int memfile_read( rtems_libio_t *iop, /* IN */ void *buffer, /* IN */ unsigned32 count /* IN */ ); int memfile_write( rtems_libio_t *iop, /* IN */ const void *buffer, /* IN */ unsigned32 count /* IN */ ); int memfile_ioctl( rtems_libio_t *iop, /* IN */ unsigned32 command, /* IN */ void *buffer /* IN */ ); int memfile_lseek( rtems_libio_t *iop, /* IN */ off_t offset, /* IN */ int whence /* IN */ ); int memfile_rmnod( rtems_filesystem_location_info_t *pathloc /* IN */ ); int device_open( rtems_libio_t *iop, /* IN */ const char *pathname, /* IN */ unsigned32 flag, /* IN */ unsigned32 mode /* IN */ ); int device_close( rtems_libio_t *iop /* IN */ ); int device_read( rtems_libio_t *iop, /* IN */ void *buffer, /* IN */ unsigned32 count /* IN */ ); int device_write( rtems_libio_t *iop, /* IN */ const void *buffer, /* IN */ unsigned32 count /* IN */ ); int device_ioctl( rtems_libio_t *iop, /* IN */ unsigned32 command, /* IN */ void *buffer /* IN */ ); int device_lseek( rtems_libio_t *iop, /* IN */ off_t offset, /* IN */ int whence /* IN */ ); int IMFS_utime( rtems_filesystem_location_info_t *pathloc, /* IN */ time_t actime, /* IN */ time_t modtime /* IN */ ); int IMFS_fchmod( rtems_filesystem_location_info_t *loc, mode_t mode ); int IMFS_symlink( rtems_filesystem_location_info_t *parent_loc, /* IN */ const char *link_name, const char *node_name ); int IMFS_readlink( rtems_filesystem_location_info_t *loc, /* IN */ char *buf, /* OUT */ size_t bufsize ); int IMFS_fdatasync( rtems_libio_t *iop ); int IMFS_fcntl( int cmd, rtems_libio_t *iop ); int IMFS_rmnod( rtems_filesystem_location_info_t *pathloc /* IN */ ); #ifdef __cplusplus } #endif #endif /* end of include file */
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