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c510061303
Add support for SquashFS filesystem. Right now, it does not support compression but support for zlib will be added in a follow-up commit. Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020 Bootlin
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*
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* Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
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*/
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#ifndef SQFS_UTILS_H
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#define SQFS_UTILS_H
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#include <linux/bitops.h>
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#include <linux/kernel.h>
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#include <stdbool.h>
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#define SQFS_FRAGMENT_INDEX_OFFSET(A) ((A) % SQFS_MAX_ENTRIES)
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#define SQFS_FRAGMENT_INDEX(A) ((A) / SQFS_MAX_ENTRIES)
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#define SQFS_BLOCK_SIZE(A) ((A) & GENMASK(23, 0))
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#define SQFS_CHECK_FLAG(flag, bit) (((flag) >> (bit)) & 1)
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/* Useful for both fragment and data blocks */
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#define SQFS_COMPRESSED_BLOCK(A) (!((A) & BIT(24)))
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/* SQFS_COMPRESSED_DATA strictly used with super block's 'flags' member */
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#define SQFS_COMPRESSED_DATA(A) (!((A) & 0x0002))
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#define SQFS_IS_FRAGMENTED(A) ((A) != 0xFFFFFFFF)
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/*
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* These two macros work as getters for a metada block header, retrieving the
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* data size and if it is compressed/uncompressed
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*/
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#define SQFS_COMPRESSED_METADATA(A) (!((A) & BIT(15)))
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#define SQFS_METADATA_SIZE(A) ((A) & GENMASK(14, 0))
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struct squashfs_super_block_flags {
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/* check: unused
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* uncompressed_ids: not supported
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*/
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bool uncompressed_inodes;
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bool uncompressed_data;
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bool check;
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bool uncompressed_frags;
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bool no_frags;
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bool always_frags;
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bool duplicates;
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bool exportable;
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bool uncompressed_xattrs;
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bool no_xattrs;
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bool compressor_options;
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bool uncompressed_ids;
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};
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#endif /* SQFS_UTILS_H */
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