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Date: Tue, 29 Jul 2014 05:22:55 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao2.yu@...sung.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 01/11] f2fs: add nobarrier mount option
Hi Chao,
On Tue, Jul 29, 2014 at 07:28:16PM +0800, Chao Yu wrote:
> Hi Jaegeuk,
>
> > -----Original Message-----
> > From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> > Sent: Saturday, July 26, 2014 6:47 AM
> > To: linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org;
> > linux-f2fs-devel@...ts.sourceforge.net
> > Cc: Jaegeuk Kim
> > Subject: [f2fs-dev] [PATCH 01/11] f2fs: add nobarrier mount option
> >
> > This patch adds a mount option, nobarrier, in f2fs.
> > The assumption in here is that file system keeps the IO ordering, but
> > doesn't care about cache flushes inside the storages.
>
> Looks good to me.
> But it's better to add some description in f2fs document.
Good catch. :)
I'll add that.
Thanks,
>
> >
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>
> Reviewed-by: Chao Yu <chao2.yu@...sung.com>
>
> > ---
> > fs/f2fs/data.c | 5 ++++-
> > fs/f2fs/f2fs.h | 1 +
> > fs/f2fs/segment.c | 3 +++
> > fs/f2fs/super.c | 7 +++++++
> > 4 files changed, 15 insertions(+), 1 deletion(-)
> >
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index c77c667..482313d 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -139,7 +139,10 @@ void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
> > /* change META to META_FLUSH in the checkpoint procedure */
> > if (type >= META_FLUSH) {
> > io->fio.type = META_FLUSH;
> > - io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
> > + if (test_opt(sbi, NOBARRIER))
> > + io->fio.rw = WRITE_FLUSH | REQ_META | REQ_PRIO;
> > + else
> > + io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
> > }
> > __submit_merged_bio(io);
> > up_write(&io->io_rwsem);
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 8f507d4..e999eec 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -41,6 +41,7 @@
> > #define F2FS_MOUNT_INLINE_XATTR 0x00000080
> > #define F2FS_MOUNT_INLINE_DATA 0x00000100
> > #define F2FS_MOUNT_FLUSH_MERGE 0x00000200
> > +#define F2FS_MOUNT_NOBARRIER 0x00000400
> >
> > #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/segment.c b/fs/f2fs/segment.c
> > index 8a6e57d..9fce0f47 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -239,6 +239,9 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
> > struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
> > struct flush_cmd cmd;
> >
> > + if (test_opt(sbi, NOBARRIER))
> > + return 0;
> > +
> > if (!test_opt(sbi, FLUSH_MERGE))
> > return blkdev_issue_flush(sbi->sb->s_bdev, GFP_KERNEL, NULL);
> >
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index 34649aa..eec89a2 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -52,6 +52,7 @@ enum {
> > Opt_inline_xattr,
> > Opt_inline_data,
> > Opt_flush_merge,
> > + Opt_nobarrier,
> > Opt_err,
> > };
> >
> > @@ -69,6 +70,7 @@ static match_table_t f2fs_tokens = {
> > {Opt_inline_xattr, "inline_xattr"},
> > {Opt_inline_data, "inline_data"},
> > {Opt_flush_merge, "flush_merge"},
> > + {Opt_nobarrier, "nobarrier"},
> > {Opt_err, NULL},
> > };
> >
> > @@ -339,6 +341,9 @@ static int parse_options(struct super_block *sb, char *options)
> > case Opt_flush_merge:
> > set_opt(sbi, FLUSH_MERGE);
> > break;
> > + case Opt_nobarrier:
> > + set_opt(sbi, NOBARRIER);
> > + break;
> > default:
> > f2fs_msg(sb, KERN_ERR,
> > "Unrecognized mount option \"%s\" or missing value",
> > @@ -544,6 +549,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> > seq_puts(seq, ",inline_data");
> > if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
> > seq_puts(seq, ",flush_merge");
> > + if (!f2fs_readonly(sbi->sb) && test_opt(sbi, NOBARRIER))
> > + seq_puts(seq, ",nobarrier");
> > seq_printf(seq, ",active_logs=%u", sbi->active_logs);
> >
> > return 0;
> > --
> > 1.8.5.2 (Apple Git-48)
> >
> >
> > ------------------------------------------------------------------------------
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> > _______________________________________________
> > Linux-f2fs-devel mailing list
> > Linux-f2fs-devel@...ts.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
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