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fs/squashfs: new filesystem

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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>
This commit is contained in:
Joao Marcos Costa
2020-07-30 15:33:47 +02:00
committed by Tom Rini
parent 550a9e7902
commit c510061303
16 changed files with 2297 additions and 0 deletions
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49
fs/squashfs/sqfs_utils.h Normal file
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/* 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 */