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f2fs: compress: support lzo-rle compress algorithm 

LZO-RLE extension (run length encoding) was introduced to improve
performance of LZO algorithm in scenario of data contains many zeros,
zram has changed to use this extended algorithm by default, this
patch adds to support this algorithm extension, to enable this
extension, it needs to enable F2FS_FS_LZO and F2FS_FS_LZORLE config,
and specifies "compress_algorithm=lzo-rle" mountoption.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-04-08 19:56:32 +08:00 committed by Jaegeuk Kim
parent 5e6bbde959
commit 6d92b20103
6 changed files with 50 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/filesystems/f2fs.rst
View File

@ -244,7 +244,7 @@ checkpoint=%s[:%u[%]] Set to "disable" to turn off checkpointing. Set to "enabl
would be unusable can be viewed at /sys/fs/f2fs/<disk>/unusable
This space is reclaimed once checkpoint=enable.
compress_algorithm=%s Control compress algorithm, currently f2fs supports "lzo",
"lz4" and "zstd" algorithm.
"lz4", "zstd" and "lzo-rle" algorithm.
compress_log_size=%u Support configuring compress cluster size, the size will
be 4KB * (1 << %u), 16KB is minimum size, also it's
default size.

10
fs/f2fs/Kconfig
View File

@ -127,3 +127,13 @@ config F2FS_FS_ZSTD
default y
help
Support ZSTD compress algorithm, if unsure, say Y.
config F2FS_FS_LZORLE
bool "LZO-RLE compression support"
depends on F2FS_FS_COMPRESSION
depends on F2FS_FS_LZO
select LZO_COMPRESS
select LZO_DECOMPRESS
default y
help
Support LZO-RLE compress algorithm, if unsure, say Y.

30
fs/f2fs/compress.c
View File

@ -442,6 +442,31 @@ static const struct f2fs_compress_ops f2fs_zstd_ops = {
};
#endif
#ifdef CONFIG_F2FS_FS_LZO
#ifdef CONFIG_F2FS_FS_LZORLE
static int lzorle_compress_pages(struct compress_ctx *cc)
{
int ret;
ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
&cc->clen, cc->private);
if (ret != LZO_E_OK) {
printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
return -EIO;
}
return 0;
}
static const struct f2fs_compress_ops f2fs_lzorle_ops = {
.init_compress_ctx = lzo_init_compress_ctx,
.destroy_compress_ctx = lzo_destroy_compress_ctx,
.compress_pages = lzorle_compress_pages,
.decompress_pages = lzo_decompress_pages,
};
#endif
#endif
static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
#ifdef CONFIG_F2FS_FS_LZO
&f2fs_lzo_ops,
@ -458,6 +483,11 @@ static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
#else
NULL,
#endif
#if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
&f2fs_lzorle_ops,
#else
NULL,
#endif
};
bool f2fs_is_compress_backend_ready(struct inode *inode)

1
fs/f2fs/f2fs.h
View File

@ -1281,6 +1281,7 @@ enum compress_algorithm_type {
COMPRESS_LZO,
COMPRESS_LZ4,
COMPRESS_ZSTD,
COMPRESS_LZORLE,
COMPRESS_MAX,
};

6
fs/f2fs/super.c
View File

@ -822,6 +822,9 @@ static int parse_options(struct super_block *sb, char *options)
} else if (!strcmp(name, "zstd")) {
F2FS_OPTION(sbi).compress_algorithm =
COMPRESS_ZSTD;
} else if (!strcmp(name, "lzo-rle")) {
F2FS_OPTION(sbi).compress_algorithm =
COMPRESS_LZORLE;
} else {
kfree(name);
return -EINVAL;
@ -1415,6 +1418,9 @@ static inline void f2fs_show_compress_options(struct seq_file *seq,
case COMPRESS_ZSTD:
algtype = "zstd";
break;
case COMPRESS_LZORLE:
algtype = "lzo-rle";
break;
}
seq_printf(seq, ",compress_algorithm=%s", algtype);

3
include/trace/events/f2fs.h
View File

@ -154,7 +154,8 @@ TRACE_DEFINE_ENUM(CP_PAUSE);
__print_symbolic(type, \
{ COMPRESS_LZO, "LZO" }, \
{ COMPRESS_LZ4, "LZ4" }, \
{ COMPRESS_ZSTD, "ZSTD" })
{ COMPRESS_ZSTD, "ZSTD" }, \
{ COMPRESS_LZORLE, "LZO-RLE" })
struct f2fs_sb_info;
struct f2fs_io_info;