Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (c) 2013
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Phillip Lougher <phillip@squashfs.org.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/bio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "squashfs_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "squashfs_fs_sb.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "decompressor.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "squashfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * This file implements single-threaded decompression in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * decompressor framework
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct squashfs_stream {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	void		*stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	struct mutex	mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 						void *comp_opts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	struct squashfs_stream *stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	stream = kmalloc(sizeof(*stream), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	if (stream == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	stream->stream = msblk->decompressor->init(msblk, comp_opts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	if (IS_ERR(stream->stream)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		err = PTR_ERR(stream->stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	kfree(comp_opts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	mutex_init(&stream->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	return stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	kfree(stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	struct squashfs_stream *stream = msblk->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	if (stream) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		msblk->decompressor->free(stream->stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		kfree(stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 			int offset, int length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 			struct squashfs_page_actor *output)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	struct squashfs_stream *stream = msblk->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	mutex_lock(&stream->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	res = msblk->decompressor->decompress(msblk, stream->stream, bio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		offset, length, output);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	mutex_unlock(&stream->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	if (res < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 		ERROR("%s decompression failed, data probably corrupt\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 			msblk->decompressor->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int squashfs_max_decompressors(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }