168252eb5SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 279cb8cedSChan Jeong /* 379cb8cedSChan Jeong * Squashfs - a compressed read only filesystem for Linux 479cb8cedSChan Jeong * 579cb8cedSChan Jeong * Copyright (c) 2010 LG Electronics 679cb8cedSChan Jeong * Chan Jeong <chan.jeong@lge.com> 779cb8cedSChan Jeong * 879cb8cedSChan Jeong * lzo_wrapper.c 979cb8cedSChan Jeong */ 1079cb8cedSChan Jeong 1179cb8cedSChan Jeong #include <linux/mutex.h> 1293e72b3cSPhilippe Liard #include <linux/bio.h> 1379cb8cedSChan Jeong #include <linux/slab.h> 1479cb8cedSChan Jeong #include <linux/vmalloc.h> 1579cb8cedSChan Jeong #include <linux/lzo.h> 1679cb8cedSChan Jeong 1779cb8cedSChan Jeong #include "squashfs_fs.h" 1879cb8cedSChan Jeong #include "squashfs_fs_sb.h" 1979cb8cedSChan Jeong #include "squashfs.h" 2079cb8cedSChan Jeong #include "decompressor.h" 21846b730eSPhillip Lougher #include "page_actor.h" 2279cb8cedSChan Jeong 2379cb8cedSChan Jeong struct squashfs_lzo { 2479cb8cedSChan Jeong void *input; 2579cb8cedSChan Jeong void *output; 2679cb8cedSChan Jeong }; 2779cb8cedSChan Jeong 289508c6b9SPhillip Lougher static void *lzo_init(struct squashfs_sb_info *msblk, void *buff) 2979cb8cedSChan Jeong { 30f3065f60SPhillip Lougher int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); 31f3065f60SPhillip Lougher 3279cb8cedSChan Jeong struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL); 3379cb8cedSChan Jeong if (stream == NULL) 3479cb8cedSChan Jeong goto failed; 35f3065f60SPhillip Lougher stream->input = vmalloc(block_size); 3679cb8cedSChan Jeong if (stream->input == NULL) 3779cb8cedSChan Jeong goto failed; 38f3065f60SPhillip Lougher stream->output = vmalloc(block_size); 3979cb8cedSChan Jeong if (stream->output == NULL) 4079cb8cedSChan Jeong goto failed2; 4179cb8cedSChan Jeong 4279cb8cedSChan Jeong return stream; 4379cb8cedSChan Jeong 4479cb8cedSChan Jeong failed2: 4579cb8cedSChan Jeong vfree(stream->input); 4679cb8cedSChan Jeong failed: 4779cb8cedSChan Jeong ERROR("Failed to allocate lzo workspace\n"); 4879cb8cedSChan Jeong kfree(stream); 49b7fc0ff0SPhillip Lougher return ERR_PTR(-ENOMEM); 5079cb8cedSChan Jeong } 5179cb8cedSChan Jeong 5279cb8cedSChan Jeong 5379cb8cedSChan Jeong static void lzo_free(void *strm) 5479cb8cedSChan Jeong { 5579cb8cedSChan Jeong struct squashfs_lzo *stream = strm; 5679cb8cedSChan Jeong 5779cb8cedSChan Jeong if (stream) { 5879cb8cedSChan Jeong vfree(stream->input); 5979cb8cedSChan Jeong vfree(stream->output); 6079cb8cedSChan Jeong } 6179cb8cedSChan Jeong kfree(stream); 6279cb8cedSChan Jeong } 6379cb8cedSChan Jeong 6479cb8cedSChan Jeong 659508c6b9SPhillip Lougher static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm, 6693e72b3cSPhilippe Liard struct bio *bio, int offset, int length, 67846b730eSPhillip Lougher struct squashfs_page_actor *output) 6879cb8cedSChan Jeong { 6993e72b3cSPhilippe Liard struct bvec_iter_all iter_all = {}; 7093e72b3cSPhilippe Liard struct bio_vec *bvec = bvec_init_iter_all(&iter_all); 719508c6b9SPhillip Lougher struct squashfs_lzo *stream = strm; 72846b730eSPhillip Lougher void *buff = stream->input, *data; 7393e72b3cSPhilippe Liard int bytes = length, res; 74846b730eSPhillip Lougher size_t out_len = output->length; 7579cb8cedSChan Jeong 7693e72b3cSPhilippe Liard while (bio_next_segment(bio, &iter_all)) { 7793e72b3cSPhilippe Liard int avail = min(bytes, ((int)bvec->bv_len) - offset); 7893e72b3cSPhilippe Liard 79*fbc27241SChristoph Hellwig data = bvec_virt(bvec); 8093e72b3cSPhilippe Liard memcpy(buff, data + offset, avail); 8179cb8cedSChan Jeong buff += avail; 8279cb8cedSChan Jeong bytes -= avail; 8379cb8cedSChan Jeong offset = 0; 8479cb8cedSChan Jeong } 8579cb8cedSChan Jeong 8679cb8cedSChan Jeong res = lzo1x_decompress_safe(stream->input, (size_t)length, 8779cb8cedSChan Jeong stream->output, &out_len); 8879cb8cedSChan Jeong if (res != LZO_E_OK) 8979cb8cedSChan Jeong goto failed; 9079cb8cedSChan Jeong 9179cb8cedSChan Jeong res = bytes = (int)out_len; 92846b730eSPhillip Lougher data = squashfs_first_page(output); 93846b730eSPhillip Lougher buff = stream->output; 94846b730eSPhillip Lougher while (data) { 9509cbfeafSKirill A. Shutemov if (bytes <= PAGE_SIZE) { 96846b730eSPhillip Lougher memcpy(data, buff, bytes); 97846b730eSPhillip Lougher break; 98846b730eSPhillip Lougher } else { 9909cbfeafSKirill A. Shutemov memcpy(data, buff, PAGE_SIZE); 10009cbfeafSKirill A. Shutemov buff += PAGE_SIZE; 10109cbfeafSKirill A. Shutemov bytes -= PAGE_SIZE; 102846b730eSPhillip Lougher data = squashfs_next_page(output); 10379cb8cedSChan Jeong } 104846b730eSPhillip Lougher } 105846b730eSPhillip Lougher squashfs_finish_page(output); 10679cb8cedSChan Jeong 10779cb8cedSChan Jeong return res; 10879cb8cedSChan Jeong 10979cb8cedSChan Jeong failed: 11079cb8cedSChan Jeong return -EIO; 11179cb8cedSChan Jeong } 11279cb8cedSChan Jeong 11379cb8cedSChan Jeong const struct squashfs_decompressor squashfs_lzo_comp_ops = { 11479cb8cedSChan Jeong .init = lzo_init, 11579cb8cedSChan Jeong .free = lzo_free, 11679cb8cedSChan Jeong .decompress = lzo_uncompress, 11779cb8cedSChan Jeong .id = LZO_COMPRESSION, 11879cb8cedSChan Jeong .name = "lzo", 11979cb8cedSChan Jeong .supported = 1 12079cb8cedSChan Jeong }; 121