b814246764
Changes: - Add fs::sync function - Make correct file system in mkfs - Add few assertions to ensure that all assumptions are correct Signed-off-by: Franciszek Zdobylak <fzdobylak@antmicro.com>
102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
/*
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* Copyright (c) 2023 Antmicro <www.antmicro.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __EXT2_H__
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#define __EXT2_H__
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#define EXT2_SUPERBLOCK_OFFSET 1024
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#define EXT2_MAGIC_NUMBER 0xEF53
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#define EXT2_MAX_FILE_NAME 255
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#define EXT2_ROOT_INODE 2
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#define EXT2_RESERVED_INODES 10
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#define EXT2_GOOD_OLD_INODE_SIZE 128
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#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 /* Disk/File compression is used */
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#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 /* Directory entries record the file type */
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#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Filesystem needs recovery */
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#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Filesystem has a separate journal device */
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#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 /* Meta block groups */
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#define EXT2_FEATURE_INCOMPAT_SUPPORTED (EXT2_FEATURE_INCOMPAT_FILETYPE)
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#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 /* Sparse Superblock */
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#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 /* Large file support, 64-bit file size */
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#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 /* Binary tree sorted directory files */
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#define EXT2_FEATURE_RO_COMPAT_SUPPORTED (0)
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#define EXT2_INODE_BLOCKS 15 /* number of blocks referenced by inode i_block field */
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#define EXT2_INODE_BLOCK_DIRECT 12
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#define EXT2_INODE_BLOCK_1LVL 12
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#define EXT2_INODE_BLOCK_2LVL 13
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#define EXT2_INODE_BLOCK_3LVL 14
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/* Inode mode flags */
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#define EXT2_S_IFMT 0xF000 /* format mask */
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#define EXT2_S_IFSOCK 0xC000 /* socket */
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#define EXT2_S_IFLNK 0xA000 /* symbolic link */
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#define EXT2_S_IFREG 0x8000 /* regular file */
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#define EXT2_S_IFBLK 0x6000 /* block device */
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#define EXT2_S_IFDIR 0x4000 /* directory */
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#define EXT2_S_IFCHR 0x2000 /* character device */
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#define EXT2_S_IFIFO 0x1000 /* fifo */
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#define EXT2_S_IRUSR 0x100 /* owner may read */
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#define EXT2_S_IWUSR 0x080 /* owner may write */
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#define EXT2_S_IXUSR 0x040 /* owner may execute */
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#define EXT2_S_IRGRP 0x020 /* group members may read */
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#define EXT2_S_IWGRP 0x010 /* group members may write */
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#define EXT2_S_IXGRP 0x008 /* group members may execute */
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#define EXT2_S_IROTH 0x004 /* others may read */
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#define EXT2_S_IWOTH 0x002 /* others may write */
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#define EXT2_S_IXOTH 0x001 /* others may execute */
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/* Default file mode: rw-r--r-- */
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#define EXT2_DEF_FILE_MODE \
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(EXT2_S_IFREG | \
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EXT2_S_IRUSR | EXT2_S_IWUSR | \
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EXT2_S_IRGRP | \
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EXT2_S_IROTH)
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/* Default dir mode: rwxr-xr-x */
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#define EXT2_DEF_DIR_MODE \
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(EXT2_S_IFDIR | \
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EXT2_S_IRUSR | EXT2_S_IWUSR | EXT2_S_IXUSR | \
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EXT2_S_IRGRP | EXT2_S_IXGRP | \
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EXT2_S_IROTH | EXT2_S_IXOTH)
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#define IS_REG_FILE(mode) (((mode) & EXT2_S_IFMT) == EXT2_S_IFREG)
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#define IS_DIR(mode) (((mode) & EXT2_S_IFMT) == EXT2_S_IFDIR)
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/* Directory file type flags */
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#define EXT2_FT_UNKNOWN 0
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#define EXT2_FT_REG_FILE 1
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#define EXT2_FT_DIR 2
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#define EXT2_FT_CHRDEV 3
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#define EXT2_FT_BLKDEV 4
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#define EXT2_FT_FIFO 5
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#define EXT2_FT_SOCK 6
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#define EXT2_FT_SYMLINK 7
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#define EXT2_FT_MAX 8
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/* Superblock status flags.
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* When file system is mounted the status is set to EXT2_ERROR_FS.
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* When file system is cleanly unmounted then flag is reset to EXT2_VALID_FS.
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*/
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#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
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#define EXT2_ERROR_FS 0x0002 /* Errors detected */
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/* Revision flags. */
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#define EXT2_GOOD_OLD_REV 0x0 /* Revision 0 */
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#define EXT2_DYNAMIC_REV 0x1 /* Revision 1 */
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/* Strategy when error detected. */
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#define EXT2_ERRORS_CONTINUE 1 /* Continue as if nothing happened. */
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#define EXT2_ERRORS_RO 2 /* Mount read only. */
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#define EXT2_ERRORS_PANIC 3 /* Cause kernel panic. */
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#endif /* __EXT2_H__ */
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