ref: a45154a49b743eba4669442e6993c50583329d99
dir: /src/ext4_inode.c/
/* * Copyright (c) 2013 Grzegorz Kostka ([email protected]) * * * 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_inode.c * @brief Inode handle functions */ #include "ext4_config.h" #include "ext4_types.h" #include "ext4_inode.h" #include "ext4_super.h" /**@brief Compute number of bits for block count. * @param block_size Filesystem block_size * @return Number of bits */ static uint32_t ext4_inode_block_bits_count(uint32_t block_size) { uint32_t bits = 8; uint32_t size = block_size; do { bits++; size = size >> 1; } while (size > 256); return bits; } uint32_t ext4_inode_get_mode(struct ext4_sblock *sb, struct ext4_inode *inode) { uint32_t v = to_le16(inode->mode); if (ext4_get32(sb, creator_os) == EXT4_SUPERBLOCK_OS_HURD) { v |= ((uint32_t)to_le16(inode->osd2.hurd2.mode_high)) << 16; } return v; } void ext4_inode_set_mode(struct ext4_sblock *sb, struct ext4_inode *inode, uint32_t mode) { inode->mode = to_le16((mode << 16) >> 16); if (ext4_get32(sb, creator_os) == EXT4_SUPERBLOCK_OS_HURD) inode->osd2.hurd2.mode_high = to_le16(mode >> 16); } uint32_t ext4_inode_get_uid(struct ext4_inode *inode) { return to_le32(inode->uid); } void ext4_inode_set_uid(struct ext4_inode *inode, uint32_t uid) { inode->uid = to_le32(uid); } uint64_t ext4_inode_get_size(struct ext4_sblock *sb, struct ext4_inode *inode) { uint64_t v = to_le32(inode->size_lo); if ((ext4_get32(sb, rev_level) > 0) && (ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_FILE))) v |= ((uint64_t)to_le32(inode->size_hi)) << 32; return v; } void ext4_inode_set_size(struct ext4_inode *inode, uint64_t size) { inode->size_lo = to_le32((size << 32) >> 32); inode->size_hi = to_le32(size >> 32); } uint32_t ext4_inode_get_csum(struct ext4_sblock *sb, struct ext4_inode *inode) { uint16_t inode_size = ext4_get16(sb, inode_size); uint32_t v = to_le16(inode->osd2.linux2.checksum_lo); if (inode_size > EXT4_GOOD_OLD_INODE_SIZE) v |= ((uint32_t)to_le16(inode->checksum_hi)) << 16; return v; } void ext4_inode_set_csum(struct ext4_sblock *sb, struct ext4_inode *inode, uint32_t checksum) { uint16_t inode_size = ext4_get16(sb, inode_size); inode->osd2.linux2.checksum_lo = to_le16((checksum << 16) >> 16); if (inode_size > EXT4_GOOD_OLD_INODE_SIZE) inode->checksum_hi = to_le16(checksum >> 16); } uint32_t ext4_inode_get_access_time(struct ext4_inode *inode) { return to_le32(inode->access_time); } void ext4_inode_set_access_time(struct ext4_inode *inode, uint32_t time) { inode->access_time = to_le32(time); } uint32_t ext4_inode_get_change_inode_time(struct ext4_inode *inode) { return to_le32(inode->change_inode_time); } void ext4_inode_set_change_inode_time(struct ext4_inode *inode, uint32_t time) { inode->change_inode_time = to_le32(time); } uint32_t ext4_inode_get_modif_time(struct ext4_inode *inode) { return to_le32(inode->modification_time); } void ext4_inode_set_modif_time(struct ext4_inode *inode, uint32_t time) { inode->modification_time = to_le32(time); } uint32_t ext4_inode_get_del_time(struct ext4_inode *inode) { return to_le32(inode->deletion_time); } void ext4_inode_set_del_time(struct ext4_inode *inode, uint32_t time) { inode->deletion_time = to_le32(time); } uint32_t ext4_inode_get_gid(struct ext4_inode *inode) { return to_le32(inode->gid); } void ext4_inode_set_gid(struct ext4_inode *inode, uint32_t gid) { inode->gid = to_le32(gid); } uint16_t ext4_inode_get_links_cnt(struct ext4_inode *inode) { return to_le16(inode->links_count); } void ext4_inode_set_links_cnt(struct ext4_inode *inode, uint16_t cnt) { inode->links_count = to_le16(cnt); } uint64_t ext4_inode_get_blocks_count(struct ext4_sblock *sb, struct ext4_inode *inode) { uint64_t cnt = to_le32(inode->blocks_count_lo); if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_HUGE_FILE)) { /* 48-bit field */ cnt |= (uint64_t)to_le16(inode->osd2.linux2.blocks_high) << 32; if (ext4_inode_has_flag(inode, EXT4_INODE_FLAG_HUGE_FILE)) { uint32_t block_count = ext4_sb_get_block_size(sb); uint32_t b = ext4_inode_block_bits_count(block_count); return cnt << (b - 9); } } return cnt; } int ext4_inode_set_blocks_count(struct ext4_sblock *sb, struct ext4_inode *inode, uint64_t count) { /* 32-bit maximum */ uint64_t max = 0; max = ~max >> 32; if (count <= max) { inode->blocks_count_lo = to_le32((uint32_t)count); inode->osd2.linux2.blocks_high = 0; ext4_inode_clear_flag(inode, EXT4_INODE_FLAG_HUGE_FILE); return EOK; } /* Check if there can be used huge files (many blocks) */ if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_HUGE_FILE)) return EINVAL; /* 48-bit maximum */ max = 0; max = ~max >> 16; if (count <= max) { inode->blocks_count_lo = to_le32((uint32_t)count); inode->osd2.linux2.blocks_high = to_le16((uint16_t)(count >> 32)); ext4_inode_clear_flag(inode, EXT4_INODE_FLAG_HUGE_FILE); } else { uint32_t block_count = ext4_sb_get_block_size(sb); uint32_t block_bits =ext4_inode_block_bits_count(block_count); ext4_inode_set_flag(inode, EXT4_INODE_FLAG_HUGE_FILE); count = count >> (block_bits - 9); inode->blocks_count_lo = to_le32((uint32_t)count); inode->osd2.linux2.blocks_high = to_le16((uint16_t)(count >> 32)); } return EOK; } uint32_t ext4_inode_get_flags(struct ext4_inode *inode) { return to_le32(inode->flags); } void ext4_inode_set_flags(struct ext4_inode *inode, uint32_t flags) { inode->flags = to_le32(flags); } uint32_t ext4_inode_get_generation(struct ext4_inode *inode) { return to_le32(inode->generation); } void ext4_inode_set_generation(struct ext4_inode *inode, uint32_t gen) { inode->generation = to_le32(gen); } uint16_t ext4_inode_get_extra_isize(struct ext4_inode *inode) { return to_le16(inode->extra_isize); } void ext4_inode_set_extra_isize(struct ext4_inode *inode, uint16_t size) { inode->extra_isize = to_le16(size); } uint64_t ext4_inode_get_file_acl(struct ext4_inode *inode, struct ext4_sblock *sb) { uint64_t v = to_le32(inode->file_acl_lo); if (ext4_get32(sb, creator_os) == EXT4_SUPERBLOCK_OS_LINUX) v |= (uint32_t)to_le16(inode->osd2.linux2.file_acl_high) << 16; return v; } void ext4_inode_set_file_acl(struct ext4_inode *inode, struct ext4_sblock *sb, uint64_t acl) { inode->file_acl_lo = to_le32((acl << 32) >> 32); if (ext4_get32(sb, creator_os) == EXT4_SUPERBLOCK_OS_LINUX) inode->osd2.linux2.file_acl_high = to_le16((uint16_t)(acl >> 32)); } uint32_t ext4_inode_get_direct_block(struct ext4_inode *inode, uint32_t idx) { return to_le32(inode->blocks[idx]); } void ext4_inode_set_direct_block(struct ext4_inode *inode, uint32_t idx, uint32_t block) { inode->blocks[idx] = to_le32(block); } uint32_t ext4_inode_get_indirect_block(struct ext4_inode *inode, uint32_t idx) { return to_le32(inode->blocks[idx + EXT4_INODE_INDIRECT_BLOCK]); } void ext4_inode_set_indirect_block(struct ext4_inode *inode, uint32_t idx, uint32_t block) { inode->blocks[idx + EXT4_INODE_INDIRECT_BLOCK] = to_le32(block); } uint32_t ext4_inode_type(struct ext4_sblock *sb, struct ext4_inode *inode) { return (ext4_inode_get_mode(sb, inode) & EXT4_INODE_MODE_TYPE_MASK); } bool ext4_inode_is_type(struct ext4_sblock *sb, struct ext4_inode *inode, uint32_t type) { return ext4_inode_type(sb, inode) == type; } bool ext4_inode_has_flag(struct ext4_inode *inode, uint32_t f) { return ext4_inode_get_flags(inode) & f; } void ext4_inode_clear_flag(struct ext4_inode *inode, uint32_t f) { uint32_t flags = ext4_inode_get_flags(inode); flags = flags & (~f); ext4_inode_set_flags(inode, flags); } void ext4_inode_set_flag(struct ext4_inode *inode, uint32_t f) { uint32_t flags = ext4_inode_get_flags(inode); flags = flags | f; ext4_inode_set_flags(inode, flags); } bool ext4_inode_can_truncate(struct ext4_sblock *sb, struct ext4_inode *inode) { if ((ext4_inode_has_flag(inode, EXT4_INODE_FLAG_APPEND)) || (ext4_inode_has_flag(inode, EXT4_INODE_FLAG_IMMUTABLE))) return false; if ((ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_FILE)) || (ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_DIRECTORY)) || (ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_SOFTLINK))) return true; return false; } struct ext4_extent_header * ext4_inode_get_extent_header(struct ext4_inode *inode) { return (struct ext4_extent_header *)inode->blocks; } /** * @} */