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Date: Mon, 30 Nov 2020 19:26:48 +0800
From: Chao Yu <yuchao0@...wei.com>
To: <jaegeuk@...nel.org>
CC: <linux-f2fs-devel@...ts.sourceforge.net>,
<linux-kernel@...r.kernel.org>, <chao@...nel.org>,
Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] f2fs: compress: support lz4hc compression
Add a new mount option "compress_lz4hc_clevel=%u" to enable lz4hc compress
algorithm and specify the compress level of lz4hc.
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
Documentation/filesystems/f2fs.rst | 2 ++
fs/f2fs/compress.c | 22 +++++++++++++++++-----
fs/f2fs/f2fs.h | 8 ++++++++
fs/f2fs/inode.c | 4 ++++
fs/f2fs/super.c | 15 +++++++++++++++
5 files changed, 46 insertions(+), 5 deletions(-)
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index 8830a11a11be..cda30ea124ee 100644
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -264,6 +264,8 @@ compress_chksum Support verifying chksum of raw data in compressed cluster.
compress_cache Support to use address space of inner inode to cache
compressed block, in order to improve cache hit ratio of
random read.
+compress_lz4hc_clevel Support to enable LZ4 high compression algorithm, compress
+ level range is [3, 16].
inlinecrypt When possible, encrypt/decrypt the contents of encrypted
files using the blk-crypto framework rather than
filesystem-layer encryption. This allows the use of
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 2ec34168adbb..233be7f71e48 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -253,17 +253,24 @@ static const struct f2fs_compress_ops f2fs_lzo_ops = {
#ifdef CONFIG_F2FS_FS_LZ4
static int lz4_init_compress_ctx(struct compress_ctx *cc)
{
- cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
- LZ4_MEM_COMPRESS, GFP_NOFS);
+ unsigned int size;
+
+ size = F2FS_I(cc->inode)->i_lz4hc_clevel ?
+ LZ4HC_MEM_COMPRESS : LZ4_MEM_COMPRESS;
+
+ cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
if (!cc->private)
return -ENOMEM;
/*
* we do not change cc->clen to LZ4_compressBound(inputsize) to
* adapt worst compress case, because lz4 compressor can handle
- * output budget properly.
+ * output budget properly; for lz4hc case, keep it as it is.
*/
- cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
+ if (F2FS_I(cc->inode)->i_lz4hc_clevel)
+ cc->clen = LZ4_compressBound(cc->rlen);
+ else
+ cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
return 0;
}
@@ -275,9 +282,14 @@ static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
static int lz4_compress_pages(struct compress_ctx *cc)
{
+ unsigned char clevel = F2FS_I(cc->inode)->i_lz4hc_clevel;
int len;
- len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
+ if (clevel)
+ len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
+ cc->clen, clevel, cc->private);
+ else
+ len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
cc->clen, cc->private);
if (!len)
return -EAGAIN;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d32065417616..d3d5583ea9e5 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -149,6 +149,7 @@ struct f2fs_mount_info {
/* For compression */
unsigned char compress_algorithm; /* algorithm type */
unsigned char compress_log_size; /* cluster log size */
+ unsigned char lz4hc_clevel; /* lz4hc compress level */
bool compress_chksum; /* compressed data chksum */
unsigned char compress_ext_cnt; /* extension count */
unsigned char extensions[COMPRESS_EXT_NUM][F2FS_EXTENSION_LEN]; /* extensions */
@@ -736,6 +737,10 @@ struct f2fs_inode_info {
unsigned char i_log_cluster_size; /* log of cluster size */
unsigned short i_compress_flag; /* compress flag */
unsigned int i_cluster_size; /* cluster size */
+ unsigned char i_lz4hc_clevel; /*
+ * lz4hc compress level,
+ * range: 3-16, disable: 0
+ */
};
static inline void get_extent_info(struct extent_info *ext,
@@ -3932,6 +3937,9 @@ static inline void set_compress_context(struct inode *inode)
1 << COMPRESS_CHKSUM : 0;
F2FS_I(inode)->i_cluster_size =
1 << F2FS_I(inode)->i_log_cluster_size;
+ if (F2FS_I(inode)->i_compress_algorithm == COMPRESS_LZ4 &&
+ F2FS_OPTION(sbi).lz4hc_clevel)
+ F2FS_I(inode)->i_lz4hc_clevel = F2FS_OPTION(sbi).lz4hc_clevel;
F2FS_I(inode)->i_flags |= F2FS_COMPR_FL;
set_inode_flag(inode, FI_COMPRESSED_FILE);
stat_inc_compr_inode(inode);
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 39fad324ca52..98be4d87e067 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -461,6 +461,10 @@ static int do_read_inode(struct inode *inode)
fi->i_compress_algorithm = ri->i_compress_algorithm;
fi->i_log_cluster_size = ri->i_log_cluster_size;
fi->i_compress_flag = le16_to_cpu(ri->i_compress_flag);
+ if (fi->i_compress_algorithm == COMPRESS_LZ4 &&
+ F2FS_OPTION(sbi).lz4hc_clevel)
+ fi->i_lz4hc_clevel =
+ F2FS_OPTION(sbi).lz4hc_clevel;
fi->i_cluster_size = 1 << fi->i_log_cluster_size;
set_inode_flag(inode, FI_COMPRESSED_FILE);
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index b0c6ef2df7b8..2cd7fcc400b8 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -25,6 +25,7 @@
#include <linux/quota.h>
#include <linux/unicode.h>
#include <linux/part_stat.h>
+#include <linux/lz4.h>
#include "f2fs.h"
#include "node.h"
@@ -148,6 +149,7 @@ enum {
Opt_compress_extension,
Opt_compress_chksum,
Opt_compress_cache,
+ Opt_compress_lz4hc_clevel,
Opt_atgc,
Opt_err,
};
@@ -218,6 +220,7 @@ static match_table_t f2fs_tokens = {
{Opt_compress_extension, "compress_extension=%s"},
{Opt_compress_chksum, "compress_chksum"},
{Opt_compress_cache, "compress_cache"},
+ {Opt_compress_lz4hc_clevel, "compress_lz4hc_clevel=%u"},
{Opt_atgc, "atgc"},
{Opt_err, NULL},
};
@@ -944,12 +947,20 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
case Opt_compress_cache:
set_opt(sbi, COMPRESS_CACHE);
break;
+ case Opt_compress_lz4hc_clevel:
+ if (args->from && match_int(args, &arg))
+ return -EINVAL;
+ if (arg < LZ4HC_MIN_CLEVEL || arg > LZ4HC_MAX_CLEVEL)
+ return -EINVAL;
+ F2FS_OPTION(sbi).lz4hc_clevel = arg;
+ break;
#else
case Opt_compress_algorithm:
case Opt_compress_log_size:
case Opt_compress_extension:
case Opt_compress_chksum:
case Opt_compress_cache:
+ case Opt_compress_lz4hc_clevel:
f2fs_info(sbi, "compression options not supported");
break;
#endif
@@ -1543,6 +1554,10 @@ static inline void f2fs_show_compress_options(struct seq_file *seq,
if (test_opt(sbi, COMPRESS_CACHE))
seq_puts(seq, ",compress_cache");
+
+ if (F2FS_OPTION(sbi).lz4hc_clevel)
+ seq_printf(seq, ",compress_lz4hc_clevel=%u",
+ F2FS_OPTION(sbi).lz4hc_clevel);
}
static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
--
2.26.2
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