fs/squashfs: new filesystem

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>

1 files changed, 58 insertions, 0 deletions

diff --git a/fs/squashfs/sqfs_decompressor.h b/fs/squashfs/sqfs_decompressor.h
new file mode 100644
index 0000000000..378965dda8
--- /dev/null
+++ b/fs/squashfs/sqfs_decompressor.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Bootlin
+ *
+ * Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
+ */
+
+#ifndef SQFS_DECOMPRESSOR_H
+#define SQFS_DECOMPRESSOR_H
+
+#include <stdint.h>
+
+#define SQFS_COMP_ZLIB 1
+#define SQFS_COMP_LZMA 2
+#define SQFS_COMP_LZO 3
+#define SQFS_COMP_XZ 4
+#define SQFS_COMP_LZ4 5
+#define SQFS_COMP_ZSTD 6
+
+/* LZMA does not support any compression options */
+
+struct squashfs_gzip_opts {
+	u32 compression_level;
+	u16 window_size;
+	u16 strategies;
+};
+
+struct squashfs_xz_opts {
+	u32 dictionary_size;
+	u32 executable_filters;
+};
+
+struct squashfs_lz4_opts {
+	u32 version;
+	u32 flags;
+};
+
+struct squashfs_zstd_opts {
+	u32 compression_level;
+};
+
+struct squashfs_lzo_opts {
+	u32 algorithm;
+	u32 level;
+};
+
+union squashfs_compression_opts {
+	struct squashfs_gzip_opts *gzip;
+	struct squashfs_xz_opts *xz;
+	struct squashfs_lz4_opts *lz4;
+	struct squashfs_zstd_opts *zstd;
+	struct squashfs_lzo_opts *lzo;
+};
+
+int sqfs_decompress(u16 comp_type, void *dest, unsigned long *dest_len,
+		    void *source, u32 lenp);
+
+#endif /* SQFS_DECOMPRESSOR_H */