1c799aca3SRichard Purdie /* 2c799aca3SRichard Purdie * JFFS2 -- Journalling Flash File System, Version 2. 3c799aca3SRichard Purdie * 4c799aca3SRichard Purdie * Copyright © 2007 Nokia Corporation. All rights reserved. 5c799aca3SRichard Purdie * 6c799aca3SRichard Purdie * Created by Richard Purdie <rpurdie@openedhand.com> 7c799aca3SRichard Purdie * 8c799aca3SRichard Purdie * For licensing information, see the file 'LICENCE' in this directory. 9c799aca3SRichard Purdie * 10c799aca3SRichard Purdie */ 11c799aca3SRichard Purdie 12c799aca3SRichard Purdie #include <linux/kernel.h> 13c799aca3SRichard Purdie #include <linux/sched.h> 14c799aca3SRichard Purdie #include <linux/slab.h> 15c799aca3SRichard Purdie #include <linux/vmalloc.h> 16c799aca3SRichard Purdie #include <linux/init.h> 17c799aca3SRichard Purdie #include <linux/lzo.h> 18c799aca3SRichard Purdie #include "compr.h" 19c799aca3SRichard Purdie 20c799aca3SRichard Purdie static void *lzo_mem; 21c799aca3SRichard Purdie static void *lzo_compress_buf; 22c799aca3SRichard Purdie static DEFINE_MUTEX(deflate_mutex); 23c799aca3SRichard Purdie 24c799aca3SRichard Purdie static void free_workspace(void) 25c799aca3SRichard Purdie { 26c799aca3SRichard Purdie vfree(lzo_mem); 27c799aca3SRichard Purdie vfree(lzo_compress_buf); 28c799aca3SRichard Purdie } 29c799aca3SRichard Purdie 30c799aca3SRichard Purdie static int __init alloc_workspace(void) 31c799aca3SRichard Purdie { 32c799aca3SRichard Purdie lzo_mem = vmalloc(LZO1X_MEM_COMPRESS); 33c799aca3SRichard Purdie lzo_compress_buf = vmalloc(lzo1x_worst_compress(PAGE_SIZE)); 34c799aca3SRichard Purdie 35c799aca3SRichard Purdie if (!lzo_mem || !lzo_compress_buf) { 36c799aca3SRichard Purdie printk(KERN_WARNING "Failed to allocate lzo deflate workspace\n"); 37c799aca3SRichard Purdie free_workspace(); 38c799aca3SRichard Purdie return -ENOMEM; 39c799aca3SRichard Purdie } 40c799aca3SRichard Purdie 41c799aca3SRichard Purdie return 0; 42c799aca3SRichard Purdie } 43c799aca3SRichard Purdie 44c799aca3SRichard Purdie static int jffs2_lzo_compress(unsigned char *data_in, unsigned char *cpage_out, 45c799aca3SRichard Purdie uint32_t *sourcelen, uint32_t *dstlen, void *model) 46c799aca3SRichard Purdie { 47c799aca3SRichard Purdie size_t compress_size; 48c799aca3SRichard Purdie int ret; 49c799aca3SRichard Purdie 50c799aca3SRichard Purdie mutex_lock(&deflate_mutex); 51c799aca3SRichard Purdie ret = lzo1x_1_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem); 52c799aca3SRichard Purdie mutex_unlock(&deflate_mutex); 53c799aca3SRichard Purdie 54c799aca3SRichard Purdie if (ret != LZO_E_OK) 55c799aca3SRichard Purdie return -1; 56c799aca3SRichard Purdie 57c799aca3SRichard Purdie if (compress_size > *dstlen) 58c799aca3SRichard Purdie return -1; 59c799aca3SRichard Purdie 60c799aca3SRichard Purdie memcpy(cpage_out, lzo_compress_buf, compress_size); 61c799aca3SRichard Purdie *dstlen = compress_size; 62c799aca3SRichard Purdie 63c799aca3SRichard Purdie return 0; 64c799aca3SRichard Purdie } 65c799aca3SRichard Purdie 66c799aca3SRichard Purdie static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out, 67c799aca3SRichard Purdie uint32_t srclen, uint32_t destlen, void *model) 68c799aca3SRichard Purdie { 69c799aca3SRichard Purdie size_t dl = destlen; 70c799aca3SRichard Purdie int ret; 71c799aca3SRichard Purdie 72c799aca3SRichard Purdie ret = lzo1x_decompress_safe(data_in, srclen, cpage_out, &dl); 73c799aca3SRichard Purdie 74c799aca3SRichard Purdie if (ret != LZO_E_OK || dl != destlen) 75c799aca3SRichard Purdie return -1; 76c799aca3SRichard Purdie 77c799aca3SRichard Purdie return 0; 78c799aca3SRichard Purdie } 79c799aca3SRichard Purdie 80c799aca3SRichard Purdie static struct jffs2_compressor jffs2_lzo_comp = { 81c799aca3SRichard Purdie .priority = JFFS2_LZO_PRIORITY, 82c799aca3SRichard Purdie .name = "lzo", 83c799aca3SRichard Purdie .compr = JFFS2_COMPR_LZO, 84c799aca3SRichard Purdie .compress = &jffs2_lzo_compress, 85c799aca3SRichard Purdie .decompress = &jffs2_lzo_decompress, 86c799aca3SRichard Purdie .disabled = 0, 87c799aca3SRichard Purdie }; 88c799aca3SRichard Purdie 89c799aca3SRichard Purdie int __init jffs2_lzo_init(void) 90c799aca3SRichard Purdie { 91c799aca3SRichard Purdie int ret; 92c799aca3SRichard Purdie 93c799aca3SRichard Purdie ret = alloc_workspace(); 94c799aca3SRichard Purdie if (ret < 0) 95c799aca3SRichard Purdie return ret; 96c799aca3SRichard Purdie 97c799aca3SRichard Purdie ret = jffs2_register_compressor(&jffs2_lzo_comp); 98c799aca3SRichard Purdie if (ret) 99c799aca3SRichard Purdie free_workspace(); 100c799aca3SRichard Purdie 101c799aca3SRichard Purdie return ret; 102c799aca3SRichard Purdie } 103c799aca3SRichard Purdie 104c799aca3SRichard Purdie void jffs2_lzo_exit(void) 105c799aca3SRichard Purdie { 106c799aca3SRichard Purdie jffs2_unregister_compressor(&jffs2_lzo_comp); 107c799aca3SRichard Purdie free_workspace(); 108c799aca3SRichard Purdie } 109