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Date: Wed, 2 Dec 2020 14:31:15 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Daeho Jeong <daeho43@...il.com>, <linux-kernel@...r.kernel.org>,
<linux-f2fs-devel@...ts.sourceforge.net>, <kernel-team@...roid.com>
CC: Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v2 1/2] f2fs: add compress_mode mount option
On 2020/12/1 12:08, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
>
> We will add a new "compress_mode" mount option to control file
> compression mode. This supports "fs" and "user". In "fs" mode (default),
> f2fs does automatic compression on the compression enabled files.
> In "user" mode, f2fs disables the automaic compression and gives the
> user discretion of choosing the target file and the timing. It means
> the user can do manual compression/decompression on the compression
> enabled files using ioctls.
>
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---
> v2: changed mount option name and added more explanation of mount option
> ---
> Documentation/filesystems/f2fs.rst | 35 ++++++++++++++++++++++++++++++
> fs/f2fs/compress.c | 2 +-
> fs/f2fs/data.c | 2 +-
> fs/f2fs/f2fs.h | 30 +++++++++++++++++++++++++
> fs/f2fs/segment.c | 2 +-
> fs/f2fs/super.c | 23 ++++++++++++++++++++
> 6 files changed, 91 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index b8ee761c9922..5eb8d63439ec 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -260,6 +260,13 @@ compress_extension=%s Support adding specified extension, so that f2fs can enab
> For other files, we can still enable compression via ioctl.
> Note that, there is one reserved special extension '*', it
> can be set to enable compression for all files.
> +compress_mode=%s Control file compression mode. This supports "fs" and "user"
> + modes. In "fs" mode (default), f2fs does automatic compression
> + on the compression enabled files. In "user" mode, f2fs disables
> + the automaic compression and gives the user discretion of
> + choosing the target file and the timing. The user can do manual
> + compression/decompression on the compression enabled files using
> + ioctls.
> 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
> @@ -810,6 +817,34 @@ Compress metadata layout::
> | data length | data chksum | reserved | compressed data |
> +-------------+-------------+----------+----------------------------+
>
> +Compression mode
> +--------------------------
> +
> +f2fs supports "fs" and "user" compression modes with "compression_mode" mount option.
> +With this option, f2fs provides a choice to select the way how to compress the
> +compression enabled files (refer to "Compression implementation" section for how to
> +enable compression on a regular inode).
> +
> +1) compress_mode=fs
> +This is the default option. f2fs does automatic compression in the writeback of the
> +compression enabled files.
> +
> +2) compress_mode=user
> +This disables the automaic compression and gives the user discretion of choosing the
> +target file and the timing. The user can do manual compression/decompression on the
> +compression enabled files using F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE
> +ioctls like the below.
> +
> +To decompress a file,
> +
> +fd = open(filename, O_WRONLY, 0);
> +ret = ioctl(fd, F2FS_IOC_DECOMPRESS_FILE);
> +
> +To compress a file,
> +
> +fd = open(filename, O_WRONLY, 0);
> +ret = ioctl(fd, F2FS_IOC_COMPRESS_FILE);
> +
> NVMe Zoned Namespace devices
> ----------------------------
>
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index 3957a84a185e..87090da8693d 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -926,7 +926,7 @@ int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
>
> static bool cluster_may_compress(struct compress_ctx *cc)
> {
> - if (!f2fs_compressed_file(cc->inode))
> + if (!f2fs_need_compress_data(cc->inode))
> return false;
> if (f2fs_is_atomic_file(cc->inode))
> return false;
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index be4da52604ed..42254d3859c7 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -3164,7 +3164,7 @@ static inline bool __should_serialize_io(struct inode *inode,
> if (IS_NOQUOTA(inode))
> return false;
>
> - if (f2fs_compressed_file(inode))
> + if (f2fs_need_compress_data(inode))
> return true;
> if (wbc->sync_mode != WB_SYNC_ALL)
> return true;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index e0826779a101..94d16bde5e24 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -149,6 +149,7 @@ struct f2fs_mount_info {
> unsigned char compress_algorithm; /* algorithm type */
> unsigned compress_log_size; /* cluster log size */
> unsigned char compress_ext_cnt; /* extension count */
> + int compress_mode; /* compression mode */
> unsigned char extensions[COMPRESS_EXT_NUM][F2FS_EXTENSION_LEN]; /* extensions */
> };
>
> @@ -677,6 +678,7 @@ enum {
> FI_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
> FI_COMPRESSED_FILE, /* indicate file's data can be compressed */
> FI_MMAP_FILE, /* indicate file was mmapped */
> + FI_ENABLE_COMPRESS, /* enable compression in "user" compression mode */
> FI_MAX, /* max flag, never be used */
> };
>
> @@ -1243,6 +1245,18 @@ enum fsync_mode {
> FSYNC_MODE_NOBARRIER, /* fsync behaves nobarrier based on posix */
> };
>
> +enum {
> + COMPR_MODE_FS, /*
> + * automatically compress compression
> + * enabled files
> + */
> + COMPR_MODE_USER, /*
> + * automatical compression is disabled.
> + * user can control the file compression
> + * using ioctls
> + */
> +};
> +
> /*
> * this value is set in page as a private data which indicate that
> * the page is atomically written, and it is in inmem_pages list.
> @@ -2752,6 +2766,22 @@ static inline int f2fs_compressed_file(struct inode *inode)
> is_inode_flag_set(inode, FI_COMPRESSED_FILE);
> }
>
> +static inline bool f2fs_need_compress_data(struct inode *inode)
> +{
> + int compress_mode = F2FS_OPTION(F2FS_I_SB(inode)).compress_mode;
> +
> + if (!f2fs_compressed_file(inode))
> + return false;
> +
> + if (compress_mode == COMPR_MODE_FS)
> + return true;
> + else if (compress_mode == COMPR_MODE_USER &&
> + is_inode_flag_set(inode, FI_ENABLE_COMPRESS))
> + return true;
> +
> + return false;
> +}
> +
> static inline unsigned int addrs_per_inode(struct inode *inode)
> {
> unsigned int addrs = CUR_ADDRS_PER_INODE(inode) -
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 1596502f7375..5d6c9d6f237b 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -3254,7 +3254,7 @@ static int __get_segment_type_6(struct f2fs_io_info *fio)
> else
> return CURSEG_COLD_DATA;
> }
> - if (file_is_cold(inode) || f2fs_compressed_file(inode))
> + if (file_is_cold(inode) || f2fs_need_compress_data(inode))
Can we keep consistent about writting compressed file to code data area?
Or there is other concern about this?
Thanks,
> return CURSEG_COLD_DATA;
> if (file_is_hot(inode) ||
> is_inode_flag_set(inode, FI_HOT_DATA) ||
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 87f7a6e86370..cc6eb4ed80a2 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -146,6 +146,7 @@ enum {
> Opt_compress_algorithm,
> Opt_compress_log_size,
> Opt_compress_extension,
> + Opt_compress_mode,
> Opt_atgc,
> Opt_err,
> };
> @@ -214,6 +215,7 @@ static match_table_t f2fs_tokens = {
> {Opt_compress_algorithm, "compress_algorithm=%s"},
> {Opt_compress_log_size, "compress_log_size=%u"},
> {Opt_compress_extension, "compress_extension=%s"},
> + {Opt_compress_mode, "compress_mode=%s"},
> {Opt_atgc, "atgc"},
> {Opt_err, NULL},
> };
> @@ -934,10 +936,25 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> F2FS_OPTION(sbi).compress_ext_cnt++;
> kfree(name);
> break;
> + case Opt_compress_mode:
> + name = match_strdup(&args[0]);
> + if (!name)
> + return -ENOMEM;
> + if (!strcmp(name, "fs")) {
> + F2FS_OPTION(sbi).compress_mode = COMPR_MODE_FS;
> + } else if (!strcmp(name, "user")) {
> + F2FS_OPTION(sbi).compress_mode = COMPR_MODE_USER;
> + } else {
> + kfree(name);
> + return -EINVAL;
> + }
> + kfree(name);
> + break;
> #else
> case Opt_compress_algorithm:
> case Opt_compress_log_size:
> case Opt_compress_extension:
> + case Opt_compress_mode:
> f2fs_info(sbi, "compression options not supported");
> break;
> #endif
> @@ -1523,6 +1540,11 @@ static inline void f2fs_show_compress_options(struct seq_file *seq,
> seq_printf(seq, ",compress_extension=%s",
> F2FS_OPTION(sbi).extensions[i]);
> }
> +
> + if (F2FS_OPTION(sbi).compress_mode == COMPR_MODE_FS)
> + seq_printf(seq, ",compress_mode=%s", "fs");
> + else if (F2FS_OPTION(sbi).compress_mode == COMPR_MODE_USER)
> + seq_printf(seq, ",compress_mode=%s", "user");
> }
>
> static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> @@ -1672,6 +1694,7 @@ static void default_options(struct f2fs_sb_info *sbi)
> F2FS_OPTION(sbi).compress_algorithm = COMPRESS_LZ4;
> F2FS_OPTION(sbi).compress_log_size = MIN_COMPRESS_LOG_SIZE;
> F2FS_OPTION(sbi).compress_ext_cnt = 0;
> + F2FS_OPTION(sbi).compress_mode = COMPR_MODE_FS;
> F2FS_OPTION(sbi).bggc_mode = BGGC_MODE_ON;
>
> sbi->sb->s_flags &= ~SB_INLINECRYPT;
>
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