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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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