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Date: Wed, 06 May 2015 13:05:37 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: 'Jaegeuk Kim' <jaegeuk@...nel.org>
Cc: 'Changman Lee' <cm224.lee@...sung.com>,
linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: RE: [PATCH v2 1/3] f2fs: introduce replace_block() for reuse
Hi Jaegeuk,
Sorry for the delay.
> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> Sent: Friday, May 01, 2015 2:04 AM
> To: Chao Yu
> Cc: Changman Lee; linux-f2fs-devel@...ts.sourceforge.net; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2 1/3] f2fs: introduce replace_block() for reuse
>
> Hi Chao,
>
> On Thu, Apr 30, 2015 at 06:11:35PM +0800, Chao Yu wrote:
> > Introduce a generic function replace_block base on recover_data_page,
> > and export it. So wit it we can operate file's meta data which is in
> > CP/SSA area when we invoke fallocate with FALLOC_FL_COLLAPSE_RANGE flag.
> >
> > Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> > ---
> > fs/f2fs/f2fs.h | 4 ++--
> > fs/f2fs/recovery.c | 2 +-
> > fs/f2fs/segment.c | 33 ++++++++++++++++++++++++++-------
> > 3 files changed, 29 insertions(+), 10 deletions(-)
> >
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 8be6cab..7ab06e8 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -1560,8 +1560,8 @@ void write_node_page(struct f2fs_sb_info *, struct page *,
> > void write_data_page(struct page *, struct dnode_of_data *,
> > struct f2fs_io_info *);
> > void rewrite_data_page(struct page *, struct f2fs_io_info *);
> > -void recover_data_page(struct f2fs_sb_info *, struct page *,
> > - struct f2fs_summary *, block_t, block_t);
> > +void replace_block(struct f2fs_sb_info *, struct f2fs_summary *,
> > + block_t, block_t, bool);
> > void allocate_data_block(struct f2fs_sb_info *, struct page *,
> > block_t, block_t *, struct f2fs_summary *, int);
> > void f2fs_wait_on_page_writeback(struct page *, enum page_type);
> > diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
> > index b80d9d4..703ab2f 100644
> > --- a/fs/f2fs/recovery.c
> > +++ b/fs/f2fs/recovery.c
> > @@ -412,7 +412,7 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
> > set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
> >
> > /* write dummy data page */
> > - recover_data_page(sbi, NULL, &sum, src, dest);
> > + replace_block(sbi, &sum, src, dest, true);
>
> It's a little bit confusing.
> The recover_data_page wants not to recover curseg, right?
>
> So, does it need to call replace_block(.., false);
You're right, my mistake. The following code in this patch should be wrong,
let me fix it as you suggested. Thank you for the review!
Regards,
>
> > dn.data_blkaddr = dest;
> > set_data_blkaddr(&dn);
> > f2fs_update_extent_cache(&dn);
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index f939660..3db92fe 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -1258,26 +1258,34 @@ void rewrite_data_page(struct page *page, struct f2fs_io_info *fio)
> > f2fs_submit_page_mbio(F2FS_P_SB(page), page, fio);
> > }
> >
> > -void recover_data_page(struct f2fs_sb_info *sbi,
> > - struct page *page, struct f2fs_summary *sum,
> > - block_t old_blkaddr, block_t new_blkaddr)
> > +void replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
>
> How about f2fs_replace_block()?
>
> > + block_t old_blkaddr, block_t new_blkaddr,
> > + bool recover_curseg)
> > {
> > struct sit_info *sit_i = SIT_I(sbi);
> > struct curseg_info *curseg;
> > unsigned int segno, old_cursegno;
> > struct seg_entry *se;
> > int type;
> > + unsigned short old_blkoff;
> >
> > segno = GET_SEGNO(sbi, new_blkaddr);
> > se = get_seg_entry(sbi, segno);
> > type = se->type;
> >
> > - if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
> > - if (old_blkaddr == NULL_ADDR)
> > - type = CURSEG_COLD_DATA;
> > - else
> > + if (recover_curseg) {
>
> if (!recover_curseg) { ?
>
> > + /* for recovery flow */
> > + if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
> > + if (old_blkaddr == NULL_ADDR)
> > + type = CURSEG_COLD_DATA;
> > + else
> > + type = CURSEG_WARM_DATA;
> > + }
> > + } else {
> > + if (!IS_CURSEG(sbi, segno))
> > type = CURSEG_WARM_DATA;
> > }
> > +
> > curseg = CURSEG_I(sbi, type);
> >
> > mutex_lock(&curseg->curseg_mutex);
> > @@ -1289,6 +1297,10 @@ void recover_data_page(struct f2fs_sb_info *sbi,
> > if (segno != curseg->segno) {
> > curseg->next_segno = segno;
> > change_curseg(sbi, type, true);
> > + recover_curseg = true;
>
> ^---- Why ?
>
> > + } else {
>
> } else if {recover_curseg) {
>
> > + old_blkoff = curseg->next_blkoff;
> > + recover_curseg = false;
>
> ^---- Ditto
>
> > }
> >
> > curseg->next_blkoff = GET_BLKOFF_FROM_SEG0(sbi, new_blkaddr);
> > @@ -1297,6 +1309,13 @@ void recover_data_page(struct f2fs_sb_info *sbi,
> > refresh_sit_entry(sbi, old_blkaddr, new_blkaddr);
> > locate_dirty_segment(sbi, old_cursegno);
> >
> > + if (recover_curseg) {
> > + cureg->next_segno = old_cursegno;
> > + change_curseg(sbi, type, true);
> > + } else {
> > + curseg->next_blkoff = old_blkoff;
> > + }
>
> Do we have to do like this?
>
> if (recover_curseg) {
> cureg->next_segno = old_cursegno;
> change_curseg(sbi, type, true);
> curseg->next_blkoff = old_blkoff;
> }
>
> Thanks,
>
> > +
> > mutex_unlock(&sit_i->sentry_lock);
> > mutex_unlock(&curseg->curseg_mutex);
> > }
> > --
> > 2.3.3
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