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263 lines
6.6 KiB
263 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* This file is part of UBIFS. |
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* |
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* Copyright (C) 2006-2008 Nokia Corporation. |
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* Copyright (C) 2006, 2007 University of Szeged, Hungary |
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* |
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* Authors: Adrian Hunter |
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* Artem Bityutskiy (Битюцкий Артём) |
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* Zoltan Sogor |
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*/ |
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/* |
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* This file provides a single place to access to compression and |
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* decompression. |
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*/ |
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#include <linux/crypto.h> |
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#include "ubifs.h" |
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/* Fake description object for the "none" compressor */ |
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static struct ubifs_compressor none_compr = { |
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.compr_type = UBIFS_COMPR_NONE, |
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.name = "none", |
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.capi_name = "", |
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}; |
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#ifdef CONFIG_UBIFS_FS_LZO |
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static DEFINE_MUTEX(lzo_mutex); |
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static struct ubifs_compressor lzo_compr = { |
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.compr_type = UBIFS_COMPR_LZO, |
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.comp_mutex = &lzo_mutex, |
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.name = "lzo", |
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.capi_name = "lzo", |
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}; |
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#else |
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static struct ubifs_compressor lzo_compr = { |
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.compr_type = UBIFS_COMPR_LZO, |
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.name = "lzo", |
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}; |
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#endif |
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#ifdef CONFIG_UBIFS_FS_ZLIB |
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static DEFINE_MUTEX(deflate_mutex); |
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static DEFINE_MUTEX(inflate_mutex); |
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static struct ubifs_compressor zlib_compr = { |
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.compr_type = UBIFS_COMPR_ZLIB, |
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.comp_mutex = &deflate_mutex, |
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.decomp_mutex = &inflate_mutex, |
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.name = "zlib", |
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.capi_name = "deflate", |
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}; |
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#else |
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static struct ubifs_compressor zlib_compr = { |
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.compr_type = UBIFS_COMPR_ZLIB, |
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.name = "zlib", |
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}; |
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#endif |
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#ifdef CONFIG_UBIFS_FS_ZSTD |
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static DEFINE_MUTEX(zstd_enc_mutex); |
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static DEFINE_MUTEX(zstd_dec_mutex); |
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static struct ubifs_compressor zstd_compr = { |
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.compr_type = UBIFS_COMPR_ZSTD, |
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.comp_mutex = &zstd_enc_mutex, |
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.decomp_mutex = &zstd_dec_mutex, |
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.name = "zstd", |
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.capi_name = "zstd", |
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}; |
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#else |
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static struct ubifs_compressor zstd_compr = { |
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.compr_type = UBIFS_COMPR_ZSTD, |
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.name = "zstd", |
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}; |
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#endif |
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/* All UBIFS compressors */ |
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struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT]; |
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/** |
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* ubifs_compress - compress data. |
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* @in_buf: data to compress |
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* @in_len: length of the data to compress |
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* @out_buf: output buffer where compressed data should be stored |
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* @out_len: output buffer length is returned here |
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* @compr_type: type of compression to use on enter, actually used compression |
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* type on exit |
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* |
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* This function compresses input buffer @in_buf of length @in_len and stores |
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* the result in the output buffer @out_buf and the resulting length in |
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* @out_len. If the input buffer does not compress, it is just copied to the |
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* @out_buf. The same happens if @compr_type is %UBIFS_COMPR_NONE or if |
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* compression error occurred. |
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* |
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* Note, if the input buffer was not compressed, it is copied to the output |
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* buffer and %UBIFS_COMPR_NONE is returned in @compr_type. |
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*/ |
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void ubifs_compress(const struct ubifs_info *c, const void *in_buf, |
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int in_len, void *out_buf, int *out_len, int *compr_type) |
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{ |
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int err; |
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struct ubifs_compressor *compr = ubifs_compressors[*compr_type]; |
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if (*compr_type == UBIFS_COMPR_NONE) |
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goto no_compr; |
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/* If the input data is small, do not even try to compress it */ |
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if (in_len < UBIFS_MIN_COMPR_LEN) |
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goto no_compr; |
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if (compr->comp_mutex) |
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mutex_lock(compr->comp_mutex); |
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err = crypto_comp_compress(compr->cc, in_buf, in_len, out_buf, |
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(unsigned int *)out_len); |
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if (compr->comp_mutex) |
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mutex_unlock(compr->comp_mutex); |
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if (unlikely(err)) { |
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ubifs_warn(c, "cannot compress %d bytes, compressor %s, error %d, leave data uncompressed", |
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in_len, compr->name, err); |
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goto no_compr; |
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} |
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/* |
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* If the data compressed only slightly, it is better to leave it |
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* uncompressed to improve read speed. |
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*/ |
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if (in_len - *out_len < UBIFS_MIN_COMPRESS_DIFF) |
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goto no_compr; |
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return; |
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no_compr: |
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memcpy(out_buf, in_buf, in_len); |
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*out_len = in_len; |
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*compr_type = UBIFS_COMPR_NONE; |
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} |
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/** |
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* ubifs_decompress - decompress data. |
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* @in_buf: data to decompress |
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* @in_len: length of the data to decompress |
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* @out_buf: output buffer where decompressed data should |
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* @out_len: output length is returned here |
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* @compr_type: type of compression |
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* |
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* This function decompresses data from buffer @in_buf into buffer @out_buf. |
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* The length of the uncompressed data is returned in @out_len. This functions |
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* returns %0 on success or a negative error code on failure. |
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*/ |
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int ubifs_decompress(const struct ubifs_info *c, const void *in_buf, |
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int in_len, void *out_buf, int *out_len, int compr_type) |
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{ |
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int err; |
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struct ubifs_compressor *compr; |
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if (unlikely(compr_type < 0 || compr_type >= UBIFS_COMPR_TYPES_CNT)) { |
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ubifs_err(c, "invalid compression type %d", compr_type); |
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return -EINVAL; |
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} |
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compr = ubifs_compressors[compr_type]; |
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if (unlikely(!compr->capi_name)) { |
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ubifs_err(c, "%s compression is not compiled in", compr->name); |
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return -EINVAL; |
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} |
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if (compr_type == UBIFS_COMPR_NONE) { |
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memcpy(out_buf, in_buf, in_len); |
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*out_len = in_len; |
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return 0; |
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} |
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if (compr->decomp_mutex) |
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mutex_lock(compr->decomp_mutex); |
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err = crypto_comp_decompress(compr->cc, in_buf, in_len, out_buf, |
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(unsigned int *)out_len); |
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if (compr->decomp_mutex) |
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mutex_unlock(compr->decomp_mutex); |
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if (err) |
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ubifs_err(c, "cannot decompress %d bytes, compressor %s, error %d", |
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in_len, compr->name, err); |
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return err; |
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} |
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/** |
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* compr_init - initialize a compressor. |
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* @compr: compressor description object |
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* |
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* This function initializes the requested compressor and returns zero in case |
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* of success or a negative error code in case of failure. |
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*/ |
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static int __init compr_init(struct ubifs_compressor *compr) |
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{ |
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if (compr->capi_name) { |
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compr->cc = crypto_alloc_comp(compr->capi_name, 0, 0); |
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if (IS_ERR(compr->cc)) { |
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pr_err("UBIFS error (pid %d): cannot initialize compressor %s, error %ld", |
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current->pid, compr->name, PTR_ERR(compr->cc)); |
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return PTR_ERR(compr->cc); |
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} |
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} |
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ubifs_compressors[compr->compr_type] = compr; |
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return 0; |
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} |
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/** |
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* compr_exit - de-initialize a compressor. |
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* @compr: compressor description object |
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*/ |
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static void compr_exit(struct ubifs_compressor *compr) |
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{ |
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if (compr->capi_name) |
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crypto_free_comp(compr->cc); |
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return; |
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} |
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/** |
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* ubifs_compressors_init - initialize UBIFS compressors. |
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* |
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* This function initializes the compressor which were compiled in. Returns |
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* zero in case of success and a negative error code in case of failure. |
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*/ |
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int __init ubifs_compressors_init(void) |
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{ |
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int err; |
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err = compr_init(&lzo_compr); |
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if (err) |
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return err; |
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err = compr_init(&zstd_compr); |
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if (err) |
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goto out_lzo; |
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err = compr_init(&zlib_compr); |
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if (err) |
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goto out_zstd; |
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ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr; |
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return 0; |
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out_zstd: |
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compr_exit(&zstd_compr); |
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out_lzo: |
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compr_exit(&lzo_compr); |
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return err; |
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} |
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/** |
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* ubifs_compressors_exit - de-initialize UBIFS compressors. |
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*/ |
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void ubifs_compressors_exit(void) |
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{ |
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compr_exit(&lzo_compr); |
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compr_exit(&zlib_compr); |
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compr_exit(&zstd_compr); |
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}
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