[07a3253d] | 1 | /* |
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| 2 | * Header file for the In-Memory File System |
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| 3 | * |
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[08311cc3] | 4 | * COPYRIGHT (c) 1989-1999. |
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[07a3253d] | 5 | * On-Line Applications Research Corporation (OAR). |
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| 6 | * |
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| 7 | * The license and distribution terms for this file may be |
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| 8 | * found in the file LICENSE in this distribution or at |
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| 9 | * http://www.OARcorp.com/rtems/license.html. |
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| 10 | * |
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| 11 | * $Id$ |
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| 12 | */ |
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| 13 | |
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| 14 | #ifndef __IMFS_h |
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| 15 | #define __IMFS_h |
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| 16 | |
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| 17 | #ifdef __cplusplus |
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| 18 | extern "C" { |
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| 19 | #endif |
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| 20 | |
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| 21 | #include <rtems.h> |
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| 22 | #include <chain.h> |
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| 23 | |
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| 24 | #include <sys/types.h> |
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| 25 | #include <limits.h> |
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| 26 | #include <rtems/libio.h> |
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| 27 | |
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| 28 | /* |
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| 29 | * File name macros |
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| 30 | */ |
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| 31 | |
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| 32 | #define IMFS_is_valid_name_char( _ch ) ( 1 ) |
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| 33 | |
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| 34 | #define IMFS_is_separator( _ch ) \ |
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| 35 | rtems_filesystem_is_separator( _ch ) |
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| 36 | |
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| 37 | /* |
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| 38 | * Data types |
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| 39 | */ |
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| 40 | |
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| 41 | struct IMFS_jnode_tt; |
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| 42 | typedef struct IMFS_jnode_tt IMFS_jnode_t; |
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| 43 | |
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| 44 | typedef struct { |
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| 45 | Chain_Control Entries; |
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| 46 | rtems_filesystem_mount_table_entry_t *mt_fs; |
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| 47 | } IMFS_directory_t; |
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| 48 | |
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| 49 | typedef struct { |
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| 50 | rtems_device_major_number major; |
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| 51 | rtems_device_minor_number minor; |
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| 52 | } IMFS_device_t; |
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| 53 | |
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| 54 | typedef struct { |
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| 55 | IMFS_jnode_t *link_node; |
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| 56 | } IMFS_link_t; |
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| 57 | |
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| 58 | typedef struct { |
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| 59 | const char *name; |
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| 60 | } IMFS_sym_link_t; |
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| 61 | |
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| 62 | /* |
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| 63 | * IMFS "memfile" information |
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| 64 | * |
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| 65 | * The data structure for the in-memory "memfiles" is based on classic UNIX. |
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| 66 | * |
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| 67 | * block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in |
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| 68 | * length which could be data or a table of pointers to blocks. |
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[562e7ed1] | 69 | * |
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| 70 | * Setting IMFS_MEMFILE_BYTES_PER_BLOCK to different values has a significant |
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| 71 | * impact on the maximum file size supported as well as the amount of |
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| 72 | * memory wasted due to internal file fragmentation. The following |
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| 73 | * is a list of maximum file sizes based on various settings |
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| 74 | * |
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| 75 | * max_filesize with blocks of 16 is 1,328 |
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| 76 | * max_filesize with blocks of 32 is 18,656 |
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| 77 | * max_filesize with blocks of 64 is 279,488 |
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| 78 | * max_filesize with blocks of 128 is 4,329,344 |
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| 79 | * max_filesize with blocks of 256 is 68,173,568 |
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| 80 | * max_filesize with blocks of 512 is 1,082,195,456 |
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[07a3253d] | 81 | */ |
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| 82 | |
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[562e7ed1] | 83 | #define IMFS_MEMFILE_BYTES_PER_BLOCK 128 |
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[07a3253d] | 84 | #define IMFS_MEMFILE_BLOCK_SLOTS \ |
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| 85 | (IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *)) |
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| 86 | |
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| 87 | typedef unsigned char * block_p; |
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| 88 | typedef block_p *block_ptr; |
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| 89 | |
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| 90 | typedef struct { |
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| 91 | off_t size; /* size of file in bytes */ |
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| 92 | block_ptr indirect; /* array of 128 data blocks pointers */ |
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| 93 | block_ptr doubly_indirect; /* 128 indirect blocks */ |
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| 94 | block_ptr triply_indirect; /* 128 doubly indirect blocks */ |
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| 95 | } IMFS_memfile_t; |
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| 96 | |
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| 97 | /* |
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| 98 | * Important block numbers for "memfiles" |
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| 99 | */ |
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| 100 | |
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| 101 | #define FIRST_INDIRECT (0) |
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| 102 | #define LAST_INDIRECT (IMFS_MEMFILE_BLOCK_SLOTS - 1) |
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| 103 | |
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| 104 | #define FIRST_DOUBLY_INDIRECT (LAST_INDIRECT + 1) |
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| 105 | #define LAST_DOUBLY_INDIRECT \ |
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| 106 | (LAST_INDIRECT + \ |
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| 107 | (IMFS_MEMFILE_BLOCK_SLOTS * IMFS_MEMFILE_BLOCK_SLOTS)) |
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| 108 | |
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| 109 | #define FIRST_TRIPLY_INDIRECT (LAST_DOUBLY_INDIRECT + 1) |
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| 110 | #define LAST_TRIPLY_INDIRECT \ |
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| 111 | (LAST_DOUBLY_INDIRECT +\ |
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| 112 | (IMFS_MEMFILE_BLOCK_SLOTS * \ |
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| 113 | IMFS_MEMFILE_BLOCK_SLOTS * IMFS_MEMFILE_BLOCK_SLOTS)) |
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| 114 | |
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| 115 | #define IMFS_MEMFILE_MAXIMUM_SIZE \ |
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| 116 | (LAST_TRIPLY_INDIRECT * IMFS_MEMFILE_BYTES_PER_BLOCK) |
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| 117 | |
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| 118 | /* |
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| 119 | * What types of IMFS file systems entities there can be. |
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| 120 | */ |
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| 121 | |
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| 122 | #define IMFS_jnode_types_t rtems_filesystem_node_types_t |
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| 123 | #define IMFS_DIRECTORY RTEMS_FILESYSTEM_DIRECTORY |
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| 124 | #define IMFS_DEVICE RTEMS_FILESYSTEM_DEVICE |
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| 125 | #define IMFS_HARD_LINK RTEMS_FILESYSTEM_HARD_LINK |
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| 126 | #define IMFS_SYM_LINK RTEMS_FILESYSTEM_SYM_LINK |
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| 127 | #define IMFS_MEMORY_FILE RTEMS_FILESYSTEM_MEMORY_FILE |
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| 128 | |
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| 129 | #define IMFS_NUMBER_OF_TYPES (IMFS_MEMORY_FILE + 1) |
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| 130 | |
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| 131 | typedef union { |
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| 132 | IMFS_directory_t directory; |
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| 133 | IMFS_device_t device; |
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| 134 | IMFS_link_t hard_link; |
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| 135 | IMFS_sym_link_t sym_link; |
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| 136 | IMFS_memfile_t file; |
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| 137 | } IMFS_types_union; |
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| 138 | |
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[3cf8394] | 139 | /* |
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| 140 | * Maximum length of a "basename" of an IMFS file/node. |
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| 141 | */ |
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| 142 | |
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| 143 | #define IMFS_NAME_MAX 32 |
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| 144 | |
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[07a3253d] | 145 | /* |
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| 146 | * The control structure for an IMFS jnode. |
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| 147 | */ |
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| 148 | |
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| 149 | struct IMFS_jnode_tt { |
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[3cf8394] | 150 | Chain_Node Node; /* for chaining them together */ |
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| 151 | IMFS_jnode_t *Parent; /* Parent node */ |
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| 152 | char name[IMFS_NAME_MAX+1]; /* "basename" */ |
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| 153 | mode_t st_mode; /* File mode */ |
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| 154 | nlink_t st_nlink; /* Link count */ |
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| 155 | ino_t st_ino; /* inode */ |
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| 156 | |
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| 157 | uid_t st_uid; /* User ID of owner */ |
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| 158 | gid_t st_gid; /* Group ID of owner */ |
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| 159 | |
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| 160 | time_t st_atime; /* Time of last access */ |
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| 161 | time_t st_mtime; /* Time of last modification */ |
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| 162 | time_t st_ctime; /* Time of last status change */ |
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| 163 | IMFS_jnode_types_t type; /* Type of this entry */ |
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| 164 | IMFS_types_union info; |
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[07a3253d] | 165 | }; |
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| 166 | |
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| 167 | #define IMFS_update_atime( _jnode ) \ |
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| 168 | do { \ |
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| 169 | struct timeval tv; \ |
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| 170 | gettimeofday( &tv, 0 ); \ |
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| 171 | _jnode->st_atime = (time_t) tv.tv_sec; \ |
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| 172 | } while (0) |
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| 173 | |
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| 174 | #define IMFS_update_mtime( _jnode ) \ |
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| 175 | do { \ |
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| 176 | struct timeval tv; \ |
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| 177 | gettimeofday( &tv, 0 ); \ |
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| 178 | _jnode->st_mtime = (time_t) tv.tv_sec; \ |
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| 179 | } while (0) |
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| 180 | |
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| 181 | #define IMFS_update_ctime( _jnode ) \ |
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| 182 | do { \ |
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| 183 | struct timeval tv; \ |
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| 184 | gettimeofday( &tv, 0 ); \ |
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| 185 | _jnode->st_ctime = (time_t) tv.tv_sec; \ |
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| 186 | } while (0) |
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| 187 | |
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| 188 | #define IMFS_atime_mtime_update( _jnode ) \ |
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| 189 | do { \ |
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| 190 | struct timeval tv; \ |
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| 191 | gettimeofday( &tv, 0 ); \ |
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| 192 | _jnode->st_mtime = (time_t) tv.tv_sec; \ |
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| 193 | _jnode->st_atime = (time_t) tv.tv_sec; \ |
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| 194 | } while (0) |
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| 195 | |
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| 196 | typedef struct { |
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[657e1bf6] | 197 | ino_t ino_count; |
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| 198 | rtems_filesystem_file_handlers_r *memfile_handlers; |
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| 199 | rtems_filesystem_file_handlers_r *directory_handlers; |
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[07a3253d] | 200 | } IMFS_fs_info_t; |
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| 201 | |
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| 202 | #define increment_and_check_linkcounts( _fs_info ) \ |
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| 203 | ((IMFS_fs_info_t * )_fs_info)->link_counts++; \ |
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| 204 | if ( ((IMFS_fs_info_t * )_fs_info)->link_counts > MAXSYMLINKS ) \ |
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| 205 | set_errno_and_return_minus_one( ELOOP ) |
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| 206 | |
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| 207 | #define decrement_linkcounts( _fs_info ) \ |
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| 208 | ((IMFS_fs_info_t * )_fs_info)->link_counts--; |
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| 209 | |
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| 210 | /* |
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| 211 | * Type defination for tokens returned from IMFS_get_token |
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| 212 | */ |
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| 213 | |
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| 214 | typedef enum { |
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| 215 | IMFS_NO_MORE_PATH, |
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| 216 | IMFS_CURRENT_DIR, |
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| 217 | IMFS_UP_DIR, |
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| 218 | IMFS_NAME, |
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| 219 | IMFS_INVALID_TOKEN |
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| 220 | } IMFS_token_types; |
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| 221 | |
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| 222 | /* |
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| 223 | * Shared Data |
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| 224 | */ |
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| 225 | |
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[94b357c2] | 226 | extern rtems_filesystem_file_handlers_r IMFS_directory_handlers; |
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[51435fc7] | 227 | extern rtems_filesystem_file_handlers_r IMFS_device_handlers; |
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[94b357c2] | 228 | extern rtems_filesystem_file_handlers_r IMFS_link_handlers; |
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[51435fc7] | 229 | extern rtems_filesystem_file_handlers_r IMFS_memfile_handlers; |
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[07a3253d] | 230 | extern rtems_filesystem_operations_table IMFS_ops; |
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[657e1bf6] | 231 | extern rtems_filesystem_operations_table miniIMFS_ops; |
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[07a3253d] | 232 | extern rtems_filesystem_limits_and_options_t IMFS_LIMITS_AND_OPTIONS; |
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| 233 | |
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| 234 | /* |
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| 235 | * Routines |
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| 236 | */ |
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| 237 | |
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| 238 | int IMFS_initialize( |
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| 239 | rtems_filesystem_mount_table_entry_t *mt_entry |
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| 240 | ); |
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| 241 | |
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[657e1bf6] | 242 | int miniIMFS_initialize( |
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| 243 | rtems_filesystem_mount_table_entry_t *mt_entry |
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| 244 | ); |
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| 245 | |
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| 246 | int IMFS_initialize_support( |
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| 247 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 248 | rtems_filesystem_operations_table *op_table, |
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| 249 | rtems_filesystem_file_handlers_r *memfile_handlers, |
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| 250 | rtems_filesystem_file_handlers_r *directory_handlers |
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| 251 | ); |
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| 252 | |
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[07a3253d] | 253 | int IMFS_fsunmount( |
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| 254 | rtems_filesystem_mount_table_entry_t *mt_entry |
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| 255 | ); |
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| 256 | |
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| 257 | |
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| 258 | /* |
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| 259 | * Returns the number of characters copied from path to token. |
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| 260 | */ |
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| 261 | IMFS_token_types IMFS_get_token( |
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| 262 | const char *path, |
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| 263 | char *token, |
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| 264 | int *token_len |
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| 265 | ); |
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| 266 | |
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| 267 | void IMFS_dump( void ); |
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| 268 | |
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| 269 | void IMFS_initialize_jnode( |
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| 270 | IMFS_jnode_t *the_jnode, |
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| 271 | IMFS_jnode_types_t type, |
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| 272 | IMFS_jnode_t *the_parent, |
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| 273 | char *name, |
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| 274 | mode_t mode |
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| 275 | ); |
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| 276 | |
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| 277 | IMFS_jnode_t *IMFS_find_match_in_dir( |
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| 278 | IMFS_jnode_t *directory, /* IN */ |
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| 279 | char *name /* IN */ |
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| 280 | ); |
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| 281 | |
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| 282 | rtems_filesystem_node_types_t IMFS_node_type( |
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| 283 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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| 284 | ); |
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| 285 | |
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| 286 | int IMFS_stat( |
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| 287 | rtems_filesystem_location_info_t *loc, /* IN */ |
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| 288 | struct stat *buf /* OUT */ |
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| 289 | ); |
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| 290 | |
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[7f6a0750] | 291 | int IMFS_Set_handlers( |
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| 292 | rtems_filesystem_location_info_t *loc |
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| 293 | ); |
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| 294 | |
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[07a3253d] | 295 | int IMFS_evaluate_link( |
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| 296 | rtems_filesystem_location_info_t *node, /* IN/OUT */ |
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| 297 | int flags /* IN */ |
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| 298 | ); |
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| 299 | |
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| 300 | int IMFS_eval_path( |
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| 301 | const char *pathname, /* IN */ |
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| 302 | int flags, /* IN */ |
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| 303 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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| 304 | ); |
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| 305 | |
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| 306 | |
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| 307 | int IMFS_link( |
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| 308 | rtems_filesystem_location_info_t *to_loc, /* IN */ |
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| 309 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
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| 310 | const char *token /* IN */ |
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| 311 | ); |
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| 312 | |
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| 313 | int IMFS_unlink( |
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| 314 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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| 315 | ); |
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| 316 | |
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| 317 | int IMFS_chown( |
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| 318 | rtems_filesystem_location_info_t *pathloc, /* IN */ |
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| 319 | uid_t owner, /* IN */ |
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| 320 | gid_t group /* IN */ |
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| 321 | ); |
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| 322 | |
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| 323 | int IMFS_freenodinfo( |
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| 324 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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| 325 | ); |
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| 326 | |
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| 327 | int IMFS_mknod( |
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| 328 | const char *path, /* IN */ |
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| 329 | mode_t mode, /* IN */ |
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| 330 | dev_t dev, /* IN */ |
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| 331 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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| 332 | ); |
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| 333 | |
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| 334 | IMFS_jnode_t *IMFS_create_node( |
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| 335 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
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| 336 | IMFS_jnode_types_t type, /* IN */ |
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| 337 | char *name, /* IN */ |
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| 338 | mode_t mode, /* IN */ |
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| 339 | IMFS_types_union *info /* IN */ |
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| 340 | ); |
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| 341 | |
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| 342 | int IMFS_evaluate_for_make( |
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| 343 | const char *path, /* IN */ |
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| 344 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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| 345 | const char **name /* OUT */ |
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| 346 | ); |
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| 347 | |
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| 348 | int IMFS_mount( |
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| 349 | rtems_filesystem_mount_table_entry_t *mt_entry /* IN */ |
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| 350 | ); |
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| 351 | |
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| 352 | int IMFS_unmount( |
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| 353 | rtems_filesystem_mount_table_entry_t *mt_entry /* IN */ |
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| 354 | ); |
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| 355 | |
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| 356 | int IMFS_freenod( |
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| 357 | rtems_filesystem_location_info_t *node /* IN/OUT */ |
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| 358 | ); |
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| 359 | |
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| 360 | int IMFS_memfile_remove( |
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| 361 | IMFS_jnode_t *the_jnode /* IN/OUT */ |
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| 362 | ); |
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| 363 | |
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| 364 | int memfile_ftruncate( |
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| 365 | rtems_libio_t *iop, /* IN */ |
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| 366 | off_t length /* IN */ |
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| 367 | ); |
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[b568ccb] | 368 | |
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[07a3253d] | 369 | int imfs_dir_open( |
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| 370 | rtems_libio_t *iop, /* IN */ |
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| 371 | const char *pathname, /* IN */ |
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| 372 | unsigned32 flag, /* IN */ |
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| 373 | unsigned32 mode /* IN */ |
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| 374 | ); |
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[b568ccb] | 375 | |
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[07a3253d] | 376 | int imfs_dir_close( |
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| 377 | rtems_libio_t *iop /* IN */ |
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| 378 | ); |
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[b568ccb] | 379 | |
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[07a3253d] | 380 | int imfs_dir_read( |
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| 381 | rtems_libio_t *iop, /* IN */ |
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| 382 | void *buffer, /* IN */ |
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| 383 | unsigned32 count /* IN */ |
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| 384 | ); |
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[b568ccb] | 385 | |
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[07a3253d] | 386 | int imfs_dir_lseek( |
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| 387 | rtems_libio_t *iop, /* IN */ |
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| 388 | off_t offset, /* IN */ |
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| 389 | int whence /* IN */ |
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| 390 | ); |
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[b568ccb] | 391 | |
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[07a3253d] | 392 | int imfs_dir_fstat( |
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| 393 | rtems_filesystem_location_info_t *loc, /* IN */ |
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| 394 | struct stat *buf /* OUT */ |
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| 395 | ); |
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[b568ccb] | 396 | |
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| 397 | int imfs_dir_rmnod( |
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| 398 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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| 399 | ); |
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| 400 | |
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[07a3253d] | 401 | int memfile_open( |
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| 402 | rtems_libio_t *iop, /* IN */ |
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| 403 | const char *pathname, /* IN */ |
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| 404 | unsigned32 flag, /* IN */ |
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| 405 | unsigned32 mode /* IN */ |
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| 406 | ); |
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[b568ccb] | 407 | |
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[07a3253d] | 408 | int memfile_close( |
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| 409 | rtems_libio_t *iop /* IN */ |
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| 410 | ); |
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[b568ccb] | 411 | |
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[07a3253d] | 412 | int memfile_read( |
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| 413 | rtems_libio_t *iop, /* IN */ |
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| 414 | void *buffer, /* IN */ |
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| 415 | unsigned32 count /* IN */ |
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| 416 | ); |
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[b568ccb] | 417 | |
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[07a3253d] | 418 | int memfile_write( |
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| 419 | rtems_libio_t *iop, /* IN */ |
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| 420 | const void *buffer, /* IN */ |
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| 421 | unsigned32 count /* IN */ |
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| 422 | ); |
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[b568ccb] | 423 | |
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[07a3253d] | 424 | int memfile_ioctl( |
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| 425 | rtems_libio_t *iop, /* IN */ |
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| 426 | unsigned32 command, /* IN */ |
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| 427 | void *buffer /* IN */ |
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| 428 | ); |
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[b568ccb] | 429 | |
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[07a3253d] | 430 | int memfile_lseek( |
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| 431 | rtems_libio_t *iop, /* IN */ |
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| 432 | off_t offset, /* IN */ |
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| 433 | int whence /* IN */ |
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| 434 | ); |
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[b568ccb] | 435 | |
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| 436 | int memfile_rmnod( |
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| 437 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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| 438 | ); |
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| 439 | |
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[07a3253d] | 440 | int device_open( |
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| 441 | rtems_libio_t *iop, /* IN */ |
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| 442 | const char *pathname, /* IN */ |
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| 443 | unsigned32 flag, /* IN */ |
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| 444 | unsigned32 mode /* IN */ |
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| 445 | ); |
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[b568ccb] | 446 | |
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[07a3253d] | 447 | int device_close( |
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| 448 | rtems_libio_t *iop /* IN */ |
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| 449 | ); |
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[b568ccb] | 450 | |
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[07a3253d] | 451 | int device_read( |
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| 452 | rtems_libio_t *iop, /* IN */ |
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| 453 | void *buffer, /* IN */ |
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| 454 | unsigned32 count /* IN */ |
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| 455 | ); |
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[b568ccb] | 456 | |
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[07a3253d] | 457 | int device_write( |
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| 458 | rtems_libio_t *iop, /* IN */ |
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| 459 | const void *buffer, /* IN */ |
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| 460 | unsigned32 count /* IN */ |
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| 461 | ); |
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[b568ccb] | 462 | |
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[07a3253d] | 463 | int device_ioctl( |
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| 464 | rtems_libio_t *iop, /* IN */ |
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| 465 | unsigned32 command, /* IN */ |
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| 466 | void *buffer /* IN */ |
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| 467 | ); |
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[b568ccb] | 468 | |
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[07a3253d] | 469 | int device_lseek( |
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| 470 | rtems_libio_t *iop, /* IN */ |
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| 471 | off_t offset, /* IN */ |
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| 472 | int whence /* IN */ |
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| 473 | ); |
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[b568ccb] | 474 | |
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[07a3253d] | 475 | int IMFS_utime( |
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| 476 | rtems_filesystem_location_info_t *pathloc, /* IN */ |
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| 477 | time_t actime, /* IN */ |
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| 478 | time_t modtime /* IN */ |
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| 479 | ); |
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[b568ccb] | 480 | |
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[07a3253d] | 481 | int IMFS_fchmod( |
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| 482 | rtems_filesystem_location_info_t *loc, |
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| 483 | mode_t mode |
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| 484 | ); |
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| 485 | |
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| 486 | int IMFS_symlink( |
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| 487 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
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| 488 | const char *link_name, |
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| 489 | const char *node_name |
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| 490 | ); |
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| 491 | |
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| 492 | int IMFS_readlink( |
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| 493 | rtems_filesystem_location_info_t *loc, /* IN */ |
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| 494 | char *buf, /* OUT */ |
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| 495 | size_t bufsize |
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| 496 | ); |
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| 497 | |
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[49629bd8] | 498 | int IMFS_fdatasync( |
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| 499 | rtems_libio_t *iop |
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| 500 | ); |
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| 501 | |
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[578a415] | 502 | int IMFS_fcntl( |
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| 503 | int cmd, |
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| 504 | rtems_libio_t *iop |
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| 505 | ); |
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| 506 | |
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[94b357c2] | 507 | int IMFS_rmnod( |
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| 508 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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| 509 | ); |
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| 510 | |
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[07a3253d] | 511 | #ifdef __cplusplus |
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| 512 | } |
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| 513 | #endif |
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| 514 | |
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| 515 | #endif |
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| 516 | /* end of include file */ |
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