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Diffstat (limited to 'fs/squashfs/sqfs_utils.h')
| -rw-r--r-- | fs/squashfs/sqfs_utils.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/squashfs/sqfs_utils.h b/fs/squashfs/sqfs_utils.h new file mode 100644 index 0000000000..1260abe22b --- /dev/null +++ b/fs/squashfs/sqfs_utils.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020 Bootlin + * + * Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com> + */ + +#ifndef SQFS_UTILS_H +#define SQFS_UTILS_H + +#include <linux/bitops.h> +#include <linux/kernel.h> +#include <stdbool.h> + +#define SQFS_FRAGMENT_INDEX_OFFSET(A) ((A) % SQFS_MAX_ENTRIES) +#define SQFS_FRAGMENT_INDEX(A) ((A) / SQFS_MAX_ENTRIES) +#define SQFS_BLOCK_SIZE(A) ((A) & GENMASK(23, 0)) +#define SQFS_CHECK_FLAG(flag, bit) (((flag) >> (bit)) & 1) +/* Useful for both fragment and data blocks */ +#define SQFS_COMPRESSED_BLOCK(A) (!((A) & BIT(24))) +/* SQFS_COMPRESSED_DATA strictly used with super block's 'flags' member */ +#define SQFS_COMPRESSED_DATA(A) (!((A) & 0x0002)) +#define SQFS_IS_FRAGMENTED(A) ((A) != 0xFFFFFFFF) +/* + * These two macros work as getters for a metada block header, retrieving the + * data size and if it is compressed/uncompressed + */ +#define SQFS_COMPRESSED_METADATA(A) (!((A) & BIT(15))) +#define SQFS_METADATA_SIZE(A) ((A) & GENMASK(14, 0)) + +struct squashfs_super_block_flags { + /* check: unused + * uncompressed_ids: not supported + */ + bool uncompressed_inodes; + bool uncompressed_data; + bool check; + bool uncompressed_frags; + bool no_frags; + bool always_frags; + bool duplicates; + bool exportable; + bool uncompressed_xattrs; + bool no_xattrs; + bool compressor_options; + bool uncompressed_ids; +}; + +#endif /* SQFS_UTILS_H */ |