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ubifs: Add support for zstd compression.

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zstd shows a good compression rate and is faster than lzo,
also on slow ARM cores.

Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Signed-off-by: Michele Dionisio <michele.dionisio@gmail.com>
[rw: rewrote commit message]
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Michele Dionisio 2019-05-15 23:02:02 +02:00 committed by Richard Weinberger
parent 817aa09484
commit eeabb9866e
4 changed files with 40 additions and 1 deletions
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10
fs/ubifs/Kconfig
View File

@ -6,8 +6,10 @@ config UBIFS_FS
select CRYPTO if UBIFS_FS_ADVANCED_COMPR
select CRYPTO if UBIFS_FS_LZO
select CRYPTO if UBIFS_FS_ZLIB
select CRYPTO if UBIFS_FS_ZSTD
select CRYPTO_LZO if UBIFS_FS_LZO
select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
select CRYPTO_ZSTD if UBIFS_FS_ZSTD
select CRYPTO_HASH_INFO
select UBIFS_FS_XATTR if FS_ENCRYPTION
depends on MTD_UBI
@ -38,6 +40,14 @@ config UBIFS_FS_ZLIB
help
Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
config UBIFS_FS_ZSTD
bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
depends on UBIFS_FS
default y
help
ZSTD compresses is a big win in speed over Zlib and
in compression ratio over LZO. Say 'Y' if unsure.
config UBIFS_ATIME_SUPPORT
bool "Access time support"
default n

27
fs/ubifs/compress.c
View File

@ -59,6 +59,24 @@ static struct ubifs_compressor zlib_compr = {
};
#endif
#ifdef CONFIG_UBIFS_FS_ZSTD
static DEFINE_MUTEX(zstd_enc_mutex);
static DEFINE_MUTEX(zstd_dec_mutex);
static struct ubifs_compressor zstd_compr = {
.compr_type = UBIFS_COMPR_ZSTD,
.comp_mutex = &zstd_enc_mutex,
.decomp_mutex = &zstd_dec_mutex,
.name = "zstd",
.capi_name = "zstd",
};
#else
static struct ubifs_compressor zstd_compr = {
.compr_type = UBIFS_COMPR_ZSTD,
.name = "zstd",
};
#endif
/* All UBIFS compressors */
struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
@ -216,13 +234,19 @@ int __init ubifs_compressors_init(void)
if (err)
return err;
err = compr_init(&zlib_compr);
err = compr_init(&zstd_compr);
if (err)
goto out_lzo;
err = compr_init(&zlib_compr);
if (err)
goto out_zstd;
ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
return 0;
out_zstd:
compr_exit(&zstd_compr);
out_lzo:
compr_exit(&lzo_compr);
return err;
@ -235,4 +259,5 @@ void ubifs_compressors_exit(void)
{
compr_exit(&lzo_compr);
compr_exit(&zlib_compr);
compr_exit(&zstd_compr);
}

2
fs/ubifs/super.c
View File

@ -1045,6 +1045,8 @@ static int ubifs_parse_options(struct ubifs_info *c, char *options,
c->mount_opts.compr_type = UBIFS_COMPR_LZO;
else if (!strcmp(name, "zlib"))
c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
else if (!strcmp(name, "zstd"))
c->mount_opts.compr_type = UBIFS_COMPR_ZSTD;
else {
ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready?
kfree(name);

2
fs/ubifs/ubifs-media.h
View File

@ -340,12 +340,14 @@ enum {
* UBIFS_COMPR_NONE: no compression
* UBIFS_COMPR_LZO: LZO compression
* UBIFS_COMPR_ZLIB: ZLIB compression
* UBIFS_COMPR_ZSTD: ZSTD compression
* UBIFS_COMPR_TYPES_CNT: count of supported compression types
*/
enum {
UBIFS_COMPR_NONE,
UBIFS_COMPR_LZO,
UBIFS_COMPR_ZLIB,
UBIFS_COMPR_ZSTD,
UBIFS_COMPR_TYPES_CNT,
};