1 /*- 2 * Copyright (c) 2012, 2010 Zheng Liu <lz@freebsd.org> 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 #ifndef _FS_EXT2FS_EXT2_EXTENTS_H_ 29 #define _FS_EXT2FS_EXT2_EXTENTS_H_ 30 31 #include <sys/types.h> 32 33 #define EXT4_EXT_MAGIC 0xf30a 34 35 #define EXT4_EXT_CACHE_NO 0 36 #define EXT4_EXT_CACHE_GAP 1 37 #define EXT4_EXT_CACHE_IN 2 38 39 /* 40 * Ext4 file system extent on disk. 41 */ 42 struct ext4_extent { 43 uint32_t e_blk; /* first logical block */ 44 uint16_t e_len; /* number of blocks */ 45 uint16_t e_start_hi; /* high 16 bits of physical block */ 46 uint32_t e_start_lo; /* low 32 bits of physical block */ 47 }; 48 49 /* 50 * Extent index on disk. 51 */ 52 struct ext4_extent_index { 53 uint32_t ei_blk; /* indexes logical blocks */ 54 uint32_t ei_leaf_lo; /* points to physical block of the 55 * next level */ 56 uint16_t ei_leaf_hi; /* high 16 bits of physical block */ 57 uint16_t ei_unused; 58 }; 59 60 /* 61 * Extent tree header. 62 */ 63 struct ext4_extent_header { 64 uint16_t eh_magic; /* magic number: 0xf30a */ 65 uint16_t eh_ecount; /* number of valid entries */ 66 uint16_t eh_max; /* capacity of store in entries */ 67 uint16_t eh_depth; /* the depth of extent tree */ 68 uint32_t eh_gen; /* generation of extent tree */ 69 }; 70 71 /* 72 * Save cached extent. 73 */ 74 struct ext4_extent_cache { 75 daddr_t ec_start; /* extent start */ 76 uint32_t ec_blk; /* logical block */ 77 uint32_t ec_len; 78 uint32_t ec_type; 79 }; 80 81 /* 82 * Save path to some extent. 83 */ 84 struct ext4_extent_path { 85 uint16_t ep_depth; 86 struct buf *ep_bp; 87 int ep_is_sparse; 88 union { 89 struct ext4_extent ep_sparse_ext; 90 struct ext4_extent *ep_ext; 91 }; 92 struct ext4_extent_index *ep_index; 93 struct ext4_extent_header *ep_header; 94 }; 95 96 struct inode; 97 struct m_ext2fs; 98 int ext4_ext_in_cache(struct inode *, daddr_t, struct ext4_extent *); 99 void ext4_ext_put_cache(struct inode *, struct ext4_extent *, int); 100 struct ext4_extent_path *ext4_ext_find_extent(struct m_ext2fs *fs, 101 struct inode *, daddr_t, struct ext4_extent_path *); 102 103 #endif /* !_FS_EXT2FS_EXT2_EXTENTS_H_ */ 104