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Subject[PATCH] ubifs: Add support for zstd compression.
Date
From: Michele Dionisio <michele.dionisio@gmail.com>

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>
---
fs/ubifs/Kconfig | 10 ++++++++++
fs/ubifs/compress.c | 27 ++++++++++++++++++++++++++-
fs/ubifs/super.c | 2 ++
fs/ubifs/ubifs-media.h | 2 ++
4 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/fs/ubifs/Kconfig b/fs/ubifs/Kconfig
index 9da2f135121b..8d84d2ed096d 100644
--- a/fs/ubifs/Kconfig
+++ b/fs/ubifs/Kconfig
@@ -5,8 +5,10 @@ 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
@@ -37,6 +39,14 @@ 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
diff --git a/fs/ubifs/compress.c b/fs/ubifs/compress.c
index 565cb56d7225..89183aeeeb7a 100644
--- a/fs/ubifs/compress.c
+++ b/fs/ubifs/compress.c
@@ -71,6 +71,24 @@ 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];

@@ -228,13 +246,19 @@ 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;
@@ -247,4 +271,5 @@ void ubifs_compressors_exit(void)
{
compr_exit(&lzo_compr);
compr_exit(&zlib_compr);
+ compr_exit(&zstd_compr);
}
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 04b8ecfd3470..ea8615261936 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1055,6 +1055,8 @@ 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);
diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h
index 8b7c1844014f..697b1b89066a 100644
--- a/fs/ubifs/ubifs-media.h
+++ b/fs/ubifs/ubifs-media.h
@@ -348,12 +348,14 @@ 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,
};

--
2.16.4
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