1 /* 2 * Copyright (c) 2023 Antmicro <www.antmicro.com> 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #ifndef __EXT2_H__ 8 #define __EXT2_H__ 9 10 #define EXT2_SUPERBLOCK_OFFSET 1024 11 #define EXT2_MAGIC_NUMBER 0xEF53 12 #define EXT2_MAX_FILE_NAME 255 13 #define EXT2_ROOT_INODE 2 14 #define EXT2_RESERVED_INODES 10 15 #define EXT2_GOOD_OLD_INODE_SIZE 128 16 17 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 /* Disk/File compression is used */ 18 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 /* Directory entries record the file type */ 19 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Filesystem needs recovery */ 20 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Filesystem has a separate journal device */ 21 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 /* Meta block groups */ 22 23 #define EXT2_FEATURE_INCOMPAT_SUPPORTED (EXT2_FEATURE_INCOMPAT_FILETYPE) 24 25 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 /* Sparse Superblock */ 26 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 /* Large file support, 64-bit file size */ 27 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 /* Binary tree sorted directory files */ 28 29 #define EXT2_FEATURE_RO_COMPAT_SUPPORTED (0) 30 31 #define EXT2_INODE_BLOCKS 15 /* number of blocks referenced by inode i_block field */ 32 #define EXT2_INODE_BLOCK_DIRECT 12 33 #define EXT2_INODE_BLOCK_1LVL 12 34 #define EXT2_INODE_BLOCK_2LVL 13 35 #define EXT2_INODE_BLOCK_3LVL 14 36 37 /* Inode mode flags */ 38 #define EXT2_S_IFMT 0xF000 /* format mask */ 39 #define EXT2_S_IFSOCK 0xC000 /* socket */ 40 #define EXT2_S_IFLNK 0xA000 /* symbolic link */ 41 #define EXT2_S_IFREG 0x8000 /* regular file */ 42 #define EXT2_S_IFBLK 0x6000 /* block device */ 43 #define EXT2_S_IFDIR 0x4000 /* directory */ 44 #define EXT2_S_IFCHR 0x2000 /* character device */ 45 #define EXT2_S_IFIFO 0x1000 /* fifo */ 46 47 #define EXT2_S_IRUSR 0x100 /* owner may read */ 48 #define EXT2_S_IWUSR 0x080 /* owner may write */ 49 #define EXT2_S_IXUSR 0x040 /* owner may execute */ 50 #define EXT2_S_IRGRP 0x020 /* group members may read */ 51 #define EXT2_S_IWGRP 0x010 /* group members may write */ 52 #define EXT2_S_IXGRP 0x008 /* group members may execute */ 53 #define EXT2_S_IROTH 0x004 /* others may read */ 54 #define EXT2_S_IWOTH 0x002 /* others may write */ 55 #define EXT2_S_IXOTH 0x001 /* others may execute */ 56 57 /* Default file mode: rw-r--r-- */ 58 #define EXT2_DEF_FILE_MODE \ 59 (EXT2_S_IFREG | \ 60 EXT2_S_IRUSR | EXT2_S_IWUSR | \ 61 EXT2_S_IRGRP | \ 62 EXT2_S_IROTH) 63 64 /* Default dir mode: rwxr-xr-x */ 65 #define EXT2_DEF_DIR_MODE \ 66 (EXT2_S_IFDIR | \ 67 EXT2_S_IRUSR | EXT2_S_IWUSR | EXT2_S_IXUSR | \ 68 EXT2_S_IRGRP | EXT2_S_IXGRP | \ 69 EXT2_S_IROTH | EXT2_S_IXOTH) 70 71 #define IS_REG_FILE(mode) (((mode) & EXT2_S_IFMT) == EXT2_S_IFREG) 72 #define IS_DIR(mode) (((mode) & EXT2_S_IFMT) == EXT2_S_IFDIR) 73 74 /* Directory file type flags */ 75 #define EXT2_FT_UNKNOWN 0 76 #define EXT2_FT_REG_FILE 1 77 #define EXT2_FT_DIR 2 78 #define EXT2_FT_CHRDEV 3 79 #define EXT2_FT_BLKDEV 4 80 #define EXT2_FT_FIFO 5 81 #define EXT2_FT_SOCK 6 82 #define EXT2_FT_SYMLINK 7 83 #define EXT2_FT_MAX 8 84 85 /* Superblock status flags. 86 * When file system is mounted the status is set to EXT2_ERROR_FS. 87 * When file system is cleanly unmounted then flag is reset to EXT2_VALID_FS. 88 */ 89 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 90 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 91 92 /* Revision flags. */ 93 #define EXT2_GOOD_OLD_REV 0x0 /* Revision 0 */ 94 #define EXT2_DYNAMIC_REV 0x1 /* Revision 1 */ 95 96 /* Strategy when error detected. */ 97 #define EXT2_ERRORS_CONTINUE 1 /* Continue as if nothing happened. */ 98 #define EXT2_ERRORS_RO 2 /* Mount read only. */ 99 #define EXT2_ERRORS_PANIC 3 /* Cause kernel panic. */ 100 101 #endif /* __EXT2_H__ */ 102
