| 1 | /*
|
|---|
| 2 | * Copyright (c) 2011 Maurizio Lombardi
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup fs
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 |
|
|---|
| 33 | #ifndef _MFS_SUPER_H_
|
|---|
| 34 | #define _MFS_SUPER_H_
|
|---|
| 35 |
|
|---|
| 36 | #include "mfs_const.h"
|
|---|
| 37 |
|
|---|
| 38 | /* Super block table. The root file system and every mounted file system
|
|---|
| 39 | * has an entry here. The entry holds information about the sizes of the bit
|
|---|
| 40 | * maps and inodes. The s_ninodes field gives the number of inodes available
|
|---|
| 41 | * for files and directories, including the root directory. Inode 0 is
|
|---|
| 42 | * on the disk, but not used. Thus s_ninodes = 4 means that 5 bits will be
|
|---|
| 43 | * used in the bit map, bit 0, which is always 1 and not used, and bits 1-4
|
|---|
| 44 | * for files and directories. The disk layout is:
|
|---|
| 45 | *
|
|---|
| 46 | * Item # blocks
|
|---|
| 47 | * boot block 1
|
|---|
| 48 | * super block 1 (offset 1kB)
|
|---|
| 49 | * inode map s_imap_blocks
|
|---|
| 50 | * zone map s_zmap_blocks
|
|---|
| 51 | * inodes (s_ninodes + 'inodes per block' - 1)/'inodes per block'
|
|---|
| 52 | * unused whatever is needed to fill out the current zone
|
|---|
| 53 | * data zones (s_zones - s_firstdatazone) << s_log_zone_size
|
|---|
| 54 | *
|
|---|
| 55 | */
|
|---|
| 56 |
|
|---|
| 57 | struct mfs_v3_superblock {
|
|---|
| 58 | uint32_t s_ninodes; /*# usable inodes on the device*/
|
|---|
| 59 | uint16_t s_nzones; /*total device size including bitmaps etc*/
|
|---|
| 60 | int16_t s_imap_blocks; /*# of blocks used by inode bitmap*/
|
|---|
| 61 | int16_t s_zmap_blocks; /*# of blocks used by zone bitmap*/
|
|---|
| 62 | uint16_t s_firstdatazone_old; /*# of first data zone (small)*/
|
|---|
| 63 | int16_t s_log_zone_size; /*log2 of blocks / zone*/
|
|---|
| 64 | int16_t s_pad; /*try to avoid compiler dependent padding*/
|
|---|
| 65 | int32_t s_max_size; /*maximum file size*/
|
|---|
| 66 | uint32_t s_zones; /*number of zones*/
|
|---|
| 67 | int16_t s_magic; /*magic number to recognize superblocks*/
|
|---|
| 68 |
|
|---|
| 69 | /* The following items are valid on disk only for V3 and above */
|
|---|
| 70 |
|
|---|
| 71 | int16_t s_pad2;
|
|---|
| 72 | uint16_t s_block_size; /*block size in bytes*/
|
|---|
| 73 | int8_t s_disk_version; /*filesystem format sub-version*/
|
|---|
| 74 | } __attribute__ ((packed));
|
|---|
| 75 |
|
|---|
| 76 | #endif
|
|---|
| 77 |
|
|---|
| 78 | /**
|
|---|
| 79 | * @}
|
|---|
| 80 | */
|
|---|
