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Date: Thu, 3 Dec 2020 09:30:28 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Daeho Jeong <daeho43@...il.com>
CC: <linux-kernel@...r.kernel.org>,
<linux-f2fs-devel@...ts.sourceforge.net>,
<kernel-team@...roid.com>, Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v2 1/2] f2fs: add compress_mode mount option
Alright, that makes sense. :)
On 2020/12/3 9:23, Daeho Jeong wrote:
> Yep, you're right~ :)
>
> 2020년 12월 3일 (목) 오전 10:16, Chao Yu <yuchao0@...wei.com>님이 작성:
>>
>> On 2020/12/2 18:54, Daeho Jeong wrote:
>>> We might use compress_extension=*,compress_option=user.
>>> In this option, we're gonna allocate all the writes in cold zone.
>>
>> Oh, so all files in data partition will be tagged as compressed file,
>> but the compressing time will be controlled by user, then, only blocks
>> belong to in-compress-process inode will go to cold area, right?
>>
>> Thanks,
>>
>>>
>>>
>>> 2020년 12월 2일 (수) 오후 3:31, Chao Yu <yuchao0@...wei.com <mailto:yuchao0@...wei.com>>님이 작성:
>>>
>>> On 2020/12/1 12:08, Daeho Jeong wrote:
>>> > From: Daeho Jeong <daehojeong@...gle.com <mailto: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 <mailto: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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