Hi Fengnan,
On 04/28, Fengnan Chang wrote:
> When we create a directory with enable compression, all file write into
> directory will try to compress.But sometimes we may know, new file
> cannot meet compression ratio requirements.
> We need a nocompress extension to skip those files to avoid unnecessary
> compress page test.
>
> Signed-off-by: Fengnan Chang <[email protected]>
> ---
> Documentation/filesystems/f2fs.rst | 8 +++
> fs/f2fs/f2fs.h | 2 +
> fs/f2fs/namei.c | 18 +++++--
> fs/f2fs/super.c | 79 +++++++++++++++++++++++++++++-
> 4 files changed, 103 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/filesystems/f2fs.rst
> b/Documentation/filesystems/f2fs.rst
> index 63c0c49b726d..f9248a36cd53 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -281,6 +281,14 @@ 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.
> +nocompress_extension=%s Support adding specified extension, so that
> f2fs can disable
> + compression on those corresponding files, just
> contrary to compression extension.
> + If you know exactly which files cannot be compressed,
> you can use this.
> + The same extension name cannot not appear in both
> compress and nocompress
----------
typo?
> + extension at the same time.
> + If the compress extension specifies all files, the
> types specified by the
why do we need this?
> + nocompress extension will be treated as special cases
> and will not be compressed.
> + Don't allow the nocompress extension specifies all
> files.
What does this mean?
> compress_chksum Support verifying chksum of raw data in
> compressed cluster.
> compress_mode=%s Control file compression mode. This supports "fs" and
> "user"
> modes. In "fs" mode (default), f2fs does automatic
> compression
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 87d734f5589d..3d5d28a2568f 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -150,8 +150,10 @@ struct f2fs_mount_info {
> unsigned char compress_level; /* compress level */
> bool compress_chksum; /* compressed data chksum */
> unsigned char compress_ext_cnt; /* extension count */
> + unsigned char nocompress_ext_cnt; /* nocompress extension
> count */
> int compress_mode; /* compression mode */
> unsigned char extensions[COMPRESS_EXT_NUM][F2FS_EXTENSION_LEN]; /*
> extensions */
> + unsigned char noextensions[COMPRESS_EXT_NUM][F2FS_EXTENSION_LEN]; /*
> extensions */
> };
>
> #define F2FS_FEATURE_ENCRYPT 0x0001
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index 405d85dbf9f1..84ca322a22ee 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -279,14 +279,16 @@ static void set_compress_inode(struct f2fs_sb_info
> *sbi, struct inode *inode,
> const unsigned char *name)
> {
> __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
> + unsigned char (*noext)[F2FS_EXTENSION_LEN] =
> F2FS_OPTION(sbi).noextensions;
> unsigned char (*ext)[F2FS_EXTENSION_LEN];
> - unsigned int ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
> + unsigned char ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
> + unsigned char noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
> int i, cold_count, hot_count;
>
> if (!f2fs_sb_has_compression(sbi) ||
> - is_inode_flag_set(inode, FI_COMPRESSED_FILE) ||
> F2FS_I(inode)->i_flags & F2FS_NOCOMP_FL ||
> - !f2fs_may_compress(inode))
> + !f2fs_may_compress(inode) ||
> + (!ext_cnt && !noext_cnt))
> return;
>
> down_read(&sbi->sb_lock);
> @@ -303,6 +305,16 @@ static void set_compress_inode(struct f2fs_sb_info *sbi,
> struct inode *inode,
>
> up_read(&sbi->sb_lock);
>
> + for (i = 0; i < noext_cnt; i++) {
> + if (is_extension_exist(name, noext[i])) {
> + f2fs_disable_compressed_file(inode);
> + return;
> + }
> + }
> +
> + if (is_inode_flag_set(inode, FI_COMPRESSED_FILE))
> + return;
> +
> ext = F2FS_OPTION(sbi).extensions;
>
> for (i = 0; i < ext_cnt; i++) {
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 5020152aa8fc..865191339625 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -148,6 +148,7 @@ enum {
> Opt_compress_algorithm,
> Opt_compress_log_size,
> Opt_compress_extension,
> + Opt_nocompress_extension,
> Opt_compress_chksum,
> Opt_compress_mode,
> Opt_atgc,
> @@ -222,6 +223,7 @@ 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_nocompress_extension, "nocompress_extension=%s"},
> {Opt_compress_chksum, "compress_chksum"},
> {Opt_compress_mode, "compress_mode=%s"},
> {Opt_atgc, "atgc"},
> @@ -473,6 +475,43 @@ static int f2fs_set_test_dummy_encryption(struct
> super_block *sb,
> }
>
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> +/*
> + * 1. The same extension name cannot not appear in both compress and
> non-compress extension
> + * at the same time.
> + * 2. If the compress extension specifies all files, the types specified by
> the non-compress
> + * extension will be treated as special cases and will not be compressed.
> + * 3. Don't allow the non-compress extension specifies all files.
> + */
> +static int f2fs_test_compress_extension(struct f2fs_sb_info *sbi)
> +{
> + unsigned char (*ext)[F2FS_EXTENSION_LEN];
> + unsigned char (*noext)[F2FS_EXTENSION_LEN];
> + int ext_cnt, noext_cnt, index = 0, no_index = 0;
> +
> + ext = F2FS_OPTION(sbi).extensions;
> + ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
> + noext = F2FS_OPTION(sbi).noextensions;
> + noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
> +
> + if (!ext_cnt || !noext_cnt)
> + return 0;
> +
> + for (no_index = 0; no_index < noext_cnt; no_index++) {
> + if (!strcasecmp("*", noext[no_index])) {
> + f2fs_info(sbi, "Don't allow the non-compress extension
> specifies all files");
> + return -EINVAL;
> + }
> + for (index = 0; index < ext_cnt; index++) {
> + if (!strcasecmp(ext[index], noext[no_index])) {
> + f2fs_info(sbi, "Don't allow the same extension
> %s appear in both compress and non-compress extension",
> + ext[index]);
> + return -EINVAL;
> + }
> + }
> + }
> + return 0;
> +}
> +
> #ifdef CONFIG_F2FS_FS_LZ4
> static int f2fs_set_lz4hc_level(struct f2fs_sb_info *sbi, const char *str)
> {
> @@ -546,7 +585,8 @@ static int parse_options(struct super_block *sb, char
> *options, bool is_remount)
> substring_t args[MAX_OPT_ARGS];
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> unsigned char (*ext)[F2FS_EXTENSION_LEN];
> - int ext_cnt;
> + unsigned char (*noext)[F2FS_EXTENSION_LEN];
> + int ext_cnt, noext_cnt;
> #endif
> char *p, *name;
> int arg = 0;
> @@ -1049,6 +1089,30 @@ static int parse_options(struct super_block *sb, char
> *options, bool is_remount)
> F2FS_OPTION(sbi).compress_ext_cnt++;
> kfree(name);
> break;
> + case Opt_nocompress_extension:
> + if (!f2fs_sb_has_compression(sbi)) {
> + f2fs_info(sbi, "Image doesn't support
> compression");
> + break;
> + }
> + name = match_strdup(&args[0]);
> + if (!name)
> + return -ENOMEM;
> +
> + noext = F2FS_OPTION(sbi).noextensions;
> + noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
> +
> + if (strlen(name) >= F2FS_EXTENSION_LEN ||
> + noext_cnt >= COMPRESS_EXT_NUM) {
> + f2fs_err(sbi,
> + "invalid extension length/number");
> + kfree(name);
> + return -EINVAL;
> + }
> +
> + strcpy(noext[noext_cnt], name);
> + F2FS_OPTION(sbi).nocompress_ext_cnt++;
> + kfree(name);
> + break;
> case Opt_compress_chksum:
> F2FS_OPTION(sbi).compress_chksum = true;
> break;
> @@ -1070,6 +1134,7 @@ static int parse_options(struct super_block *sb, char
> *options, bool is_remount)
> case Opt_compress_algorithm:
> case Opt_compress_log_size:
> case Opt_compress_extension:
> + case Opt_nocompress_extension:
> case Opt_compress_chksum:
> case Opt_compress_mode:
> f2fs_info(sbi, "compression options not supported");
> @@ -1122,6 +1187,13 @@ static int parse_options(struct super_block *sb, char
> *options, bool is_remount)
> }
> #endif
>
> +#ifdef CONFIG_F2FS_FS_COMPRESSION
> + if (f2fs_test_compress_extension(sbi)) {
> + f2fs_err(sbi, "invalid compress or nocompress extension");
> + return -EINVAL;
> + }
> +#endif
> +
> if (F2FS_IO_SIZE_BITS(sbi) && !f2fs_lfs_mode(sbi)) {
> f2fs_err(sbi, "Should set mode=lfs with %uKB-sized IO",
> F2FS_IO_SIZE_KB(sbi));
> @@ -1665,6 +1737,11 @@ static inline void f2fs_show_compress_options(struct
> seq_file *seq,
> F2FS_OPTION(sbi).extensions[i]);
> }
>
> + for (i = 0; i < F2FS_OPTION(sbi).nocompress_ext_cnt; i++) {
> + seq_printf(seq, ",nocompress_extension=%s",
> + F2FS_OPTION(sbi).noextensions[i]);
> + }
> +
> if (F2FS_OPTION(sbi).compress_chksum)
> seq_puts(seq, ",compress_chksum");
>
> --
> 2.29.0
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