ref: 151cd9f6e9120e3c41600875c6cfa42dc1321a0b
dir: /include/ext4_super.h/
/* * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com) * * * HelenOS: * Copyright (c) 2012 Martin Sucha * Copyright (c) 2012 Frantisek Princ * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - 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. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /** @addtogroup lwext4 * @{ */ /** * @file ext4_super.c * @brief Superblock operations. */ #ifndef EXT4_SUPER_H_ #define EXT4_SUPER_H_ #ifdef __cplusplus extern "C" { #endif #include <ext4_config.h> #include <ext4_types.h> #include <ext4_misc.h> /**@brief Blocks count get stored in superblock. * @param s superblock descriptor * @return count of blocks*/ static inline uint64_t ext4_sb_get_blocks_cnt(struct ext4_sblock *s) { return ((uint64_t)to_le32(s->blocks_count_hi) << 32) | to_le32(s->blocks_count_lo); } /**@brief Blocks count set in superblock. * @param s superblock descriptor * @return count of blocks*/ static inline void ext4_sb_set_blocks_cnt(struct ext4_sblock *s, uint64_t cnt) { s->blocks_count_lo = to_le32((cnt << 32) >> 32); s->blocks_count_hi = to_le32(cnt >> 32); } /**@brief Free blocks count get stored in superblock. * @param s superblock descriptor * @return free blocks*/ static inline uint64_t ext4_sb_get_free_blocks_cnt(struct ext4_sblock *s) { return ((uint64_t)to_le32(s->free_blocks_count_hi) << 32) | to_le32(s->free_blocks_count_lo); } /**@brief Free blocks count set. * @param s superblock descriptor * @param cnt new value of free blocks*/ static inline void ext4_sb_set_free_blocks_cnt(struct ext4_sblock *s, uint64_t cnt) { s->free_blocks_count_lo = to_le32((cnt << 32) >> 32); s->free_blocks_count_hi = to_le32(cnt >> 32); } /**@brief Block size get from superblock. * @param s superblock descriptor * @return block size in bytes*/ static inline uint32_t ext4_sb_get_block_size(struct ext4_sblock *s) { return 1024 << to_le32(s->log_block_size); } /**@brief Block group descriptor size. * @param s superblock descriptor * @return block group descriptor size in bytes*/ static inline uint16_t ext4_sb_get_desc_size(struct ext4_sblock *s) { uint16_t size = to_le16(s->desc_size); return size < EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE ? EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE : size; } /*************************Flags and features*********************************/ /**@brief Support check of flag. * @param s superblock descriptor * @param v flag to check * @return true if flag is supported*/ static inline bool ext4_sb_check_flag(struct ext4_sblock *s, uint32_t v) { return to_le32(s->flags) & v; } /**@brief Support check of feature compatible. * @param s superblock descriptor * @param v feature to check * @return true if feature is supported*/ static inline bool ext4_sb_feature_com(struct ext4_sblock *s, uint32_t v) { return to_le32(s->features_compatible) & v; } /**@brief Support check of feature incompatible. * @param s superblock descriptor * @param v feature to check * @return true if feature is supported*/ static inline bool ext4_sb_feature_incom(struct ext4_sblock *s, uint32_t v) { return to_le32(s->features_incompatible) & v; } /**@brief Support check of read only flag. * @param s superblock descriptor * @param v flag to check * @return true if flag is supported*/ static inline bool ext4_sb_feature_ro_com(struct ext4_sblock *s, uint32_t v) { return to_le32(s->features_read_only) & v; } /**@brief Block group to flex group. * @param s superblock descriptor * @param block_group block group * @return flex group id*/ static inline uint32_t ext4_sb_bg_to_flex(struct ext4_sblock *s, uint32_t block_group) { return block_group >> to_le32(s->log_groups_per_flex); } /**@brief Flex block group size. * @param s superblock descriptor * @return flex bg size*/ static inline uint32_t ext4_sb_flex_bg_size(struct ext4_sblock *s) { return 1 << to_le32(s->log_groups_per_flex); } /**@brief Return first meta block group id. * @param s superblock descriptor * @return first meta_bg id */ static inline uint32_t ext4_sb_first_meta_bg(struct ext4_sblock *s) { return to_le32(s->first_meta_bg); } /**************************More complex functions****************************/ /**@brief Returns a block group count. * @param s superblock descriptor * @return count of block groups*/ uint32_t ext4_block_group_cnt(struct ext4_sblock *s); /**@brief Returns block count in block group * (last block group may have less blocks) * @param s superblock descriptor * @param bgid block group id * @return blocks count*/ uint32_t ext4_blocks_in_group_cnt(struct ext4_sblock *s, uint32_t bgid); /**@brief Returns inodes count in block group * (last block group may have less inodes) * @param s superblock descriptor * @param bgid block group id * @return inodes count*/ uint32_t ext4_inodes_in_group_cnt(struct ext4_sblock *s, uint32_t bgid); /***************************Read/write/check superblock**********************/ /**@brief Superblock write. * @param bdev block device descriptor. * @param s superblock descriptor * @return Standard error code */ int ext4_sb_write(struct ext4_blockdev *bdev, struct ext4_sblock *s); /**@brief Superblock read. * @param bdev block device descriptor. * @param s superblock descriptor * @return Standard error code */ int ext4_sb_read(struct ext4_blockdev *bdev, struct ext4_sblock *s); /**@brief Superblock simple validation. * @param s superblock descriptor * @return true if OK*/ bool ext4_sb_check(struct ext4_sblock *s); /**@brief Superblock presence in block group. * @param s superblock descriptor * @param block_group block group id * @return true if block group has superblock*/ bool ext4_sb_is_super_in_bg(struct ext4_sblock *s, uint32_t block_group); /**@brief TODO:*/ bool ext4_sb_sparse(uint32_t group); /**@brief TODO:*/ uint32_t ext4_bg_num_gdb(struct ext4_sblock *s, uint32_t group); /**@brief TODO:*/ uint32_t ext4_num_base_meta_clusters(struct ext4_sblock *s, uint32_t block_group); #ifdef __cplusplus } #endif #endif /* EXT4_SUPER_H_ */ /** * @} */