On 2018/2/13 18:57, Junling Zheng wrote:
> Commit "0a007b97aad6"(f2fs: recover directory operations by fsync)
> fixed xfstest generic/342 case, but it also increased the written
> data and caused the performance degradation. In most cases, there's
> no need to do so heavy fsync actually.
>
> So we introduce two new mount options "fsync={posix,strict}" to
> control the policy of fsync. "fsync=posix" is set by default, and
> means that f2fs uses a light fsync, which follows POSIX semantics.
> And "fsync=strict" means that it's a heavy fsync, which behaves in
> line with xfs, ext4 and btrfs, where generic/342 will pass, but the
> performance will regress.
>
> Signed-off-by: Junling Zheng <[email protected]>
> ---
> Changes from v2:
> - Change to "fsync={posix,strict}" format
> - Set "fsync=posix" default
> Changes from v1:
> - Add document modify
> - Add reviewer
> Documentation/filesystems/f2fs.txt | 7 +++++++
> fs/f2fs/dir.c | 3 ++-
> fs/f2fs/f2fs.h | 1 +
> fs/f2fs/file.c | 3 ++-
> fs/f2fs/namei.c | 9 ++++++---
> fs/f2fs/super.c | 10 ++++++++++
> 6 files changed, 28 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/filesystems/f2fs.txt
> b/Documentation/filesystems/f2fs.txt
> index 0caf7da0a532..c00d40655bbc 100644
> --- a/Documentation/filesystems/f2fs.txt
> +++ b/Documentation/filesystems/f2fs.txt
> @@ -180,6 +180,13 @@ whint_mode=%s Control which write hints are
> passed down to block
> down hints. In "user-based" mode, f2fs tries to pass
> down hints given by users. And in "fs-based" mode,
> f2fs
> passes down hints with its policy.
> +fsync=%s Control the policy of fsync. This supports "posix" and
> + "strict" modes. In "posix" mode, which is default,
> fsync
> + will follow POSIX semantics and does a light
> operation to
> + improve the filesystem performance. In "strict" mode,
> fsync
> + will be heavy and behaves in line with xfs, ext4 and
> btrfs,
> + where xfstest generic/342 will pass, but the
> performance
> + will regress.
>
>
> ================================================================================
> DEBUGFS ENTRIES
> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
> index f00b5ed8c011..37d1259f1b92 100644
> --- a/fs/f2fs/dir.c
> +++ b/fs/f2fs/dir.c
> @@ -713,7 +713,8 @@ void f2fs_delete_entry(struct f2fs_dir_entry *dentry,
> struct page *page,
>
> f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
>
> - add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO);
> + if (test_opt(F2FS_I_SB(dir), STRICT_FSYNC))
> + add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO);
>
> if (f2fs_has_inline_dentry(dir))
> return f2fs_delete_inline_entry(dentry, page, dir, inode);
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index dbe87c7a266e..8cf914d12f17 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -97,6 +97,7 @@ extern char *fault_name[FAULT_MAX];
> #define F2FS_MOUNT_QUOTA 0x00400000
> #define F2FS_MOUNT_INLINE_XATTR_SIZE 0x00800000
> #define F2FS_MOUNT_RESERVE_ROOT 0x01000000
> +#define F2FS_MOUNT_STRICT_FSYNC 0x02000000
>
> #define clear_opt(sbi, option) ((sbi)->mount_opt.opt &=
> ~F2FS_MOUNT_##option)
> #define set_opt(sbi, option) ((sbi)->mount_opt.opt |= F2FS_MOUNT_##option)
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 672a542e5464..509b3e045247 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -165,7 +165,8 @@ static inline enum cp_reason_type
> need_do_checkpoint(struct inode *inode)
> cp_reason = CP_FASTBOOT_MODE;
> else if (sbi->active_logs == 2)
> cp_reason = CP_SPEC_LOG_NUM;
> - else if (need_dentry_mark(sbi, inode->i_ino) &&
> + else if (test_opt(sbi, STRICT_FSYNC) &&
> + need_dentry_mark(sbi, inode->i_ino) &&
> exist_written_data(sbi, F2FS_I(inode)->i_pino, TRANS_DIR_INO))
> cp_reason = CP_RECOVER_DIR;
>
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index c4c94c7e9f4f..5a385b8ab172 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -936,7 +936,8 @@ static int f2fs_rename(struct inode *old_dir, struct
> dentry *old_dentry,
> }
> f2fs_i_links_write(old_dir, false);
> }
> - add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
> + if (test_opt(sbi, STRICT_FSYNC))
> + add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
>
> f2fs_unlock_op(sbi);
>
> @@ -1091,8 +1092,10 @@ static int f2fs_cross_rename(struct inode *old_dir,
> struct dentry *old_dentry,
> }
> f2fs_mark_inode_dirty_sync(new_dir, false);
>
> - add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
> - add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
> + if (test_opt(sbi, STRICT_FSYNC)) {
> + add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
> + add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
> + }
>
> f2fs_unlock_op(sbi);
>
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 7966cf7bfb8e..8429e7b3cc7f 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -130,6 +130,8 @@ enum {
> Opt_jqfmt_vfsv0,
> Opt_jqfmt_vfsv1,
> Opt_whint,
> + Opt_posix_fsync,
> + Opt_strict_fsync,
Opt_fsync_mode,
> Opt_err,
> };
>
> @@ -184,6 +186,8 @@ static match_table_t f2fs_tokens = {
> {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
> {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
> {Opt_whint, "whint_mode=%s"},
> + {Opt_posix_fsync, "fsync=posix"},
> + {Opt_strict_fsync, "fsync=strict"},
{Opt_fsync_mode, "fsync=%s"},
> {Opt_err, NULL},
> };
>
> @@ -700,6 +704,12 @@ static int parse_options(struct super_block *sb, char
> *options)
> }
> kfree(name);
> break;
> + case Opt_posix_fsync:
> + clear_opt(sbi, STRICT_FSYNC);
> + break;
> + case Opt_strict_fsync:
> + set_opt(sbi, STRICT_FSYNC);
> + break;
case Opt_fsync_mode:
if ()
sbi->fsync_mode = F2FS_STRICT_FSYNC_MODE;
else if()
sbi->fsync_mode = F2FS_POSIX_FSYNC_MODE;
Thanks,
> default:
> f2fs_msg(sb, KERN_ERR,
> "Unrecognized mount option \"%s\" or missing
> value",
>
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