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Message-ID: <20200701042222.GA1539525@google.com>
Date: Tue, 30 Jun 2020 21:22:22 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <yuchao0@...wei.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH 1/2] f2fs: split f2fs_allocate_new_segments()
On 07/01, Chao Yu wrote:
> Jaegeuk, could you please help to change __allocate_new_segment() to static
> in your tree?
Sure. :)
>
> On 2020/6/30 4:19, Jaegeuk Kim wrote:
> > On 06/22, Chao Yu wrote:
> >> to two independent functions:
> >> - f2fs_allocate_new_segment() for specified type segment allocation
> >> - f2fs_allocate_new_segments() for all data type segments allocation
> >>
> >> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> >> ---
> >> fs/f2fs/f2fs.h | 3 ++-
> >> fs/f2fs/file.c | 2 +-
> >> fs/f2fs/recovery.c | 2 +-
> >> fs/f2fs/segment.c | 39 +++++++++++++++++++++++----------------
> >> 4 files changed, 27 insertions(+), 19 deletions(-)
> >>
> >> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> >> index 70565d81320b..07290943e91d 100644
> >> --- a/fs/f2fs/f2fs.h
> >> +++ b/fs/f2fs/f2fs.h
> >> @@ -3327,7 +3327,8 @@ void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi);
> >> int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
> >> void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >> unsigned int start, unsigned int end);
> >> -void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi, int type);
> >> +void f2fs_allocate_new_segment(struct f2fs_sb_info *sbi, int type);
> >> +void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi);
> >> int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range);
> >> bool f2fs_exist_trim_candidates(struct f2fs_sb_info *sbi,
> >> struct cp_control *cpc);
> >> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> >> index f196187159e9..67c65e40b22b 100644
> >> --- a/fs/f2fs/file.c
> >> +++ b/fs/f2fs/file.c
> >> @@ -1659,7 +1659,7 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
> >> map.m_seg_type = CURSEG_COLD_DATA_PINNED;
> >>
> >> f2fs_lock_op(sbi);
> >> - f2fs_allocate_new_segments(sbi, CURSEG_COLD_DATA);
> >> + f2fs_allocate_new_segment(sbi, CURSEG_COLD_DATA_PINNED);
> >
> > This should be CURSEG_COLD_DATA. Otherwise it causes the below kernel panic.
> > I fixed this in the -dev, so let me know, if you have other concern.
> >
> > 259 Unable to handle kernel NULL pointer dereference at virtual address 00000008
> > 259 task: 0000000082b4de99 task.stack: 00000000c6b39dbf
> > 259 pc : f2fs_do_write_data_page+0x2b4/0x794
> > 259 lr : f2fs_do_write_data_page+0x290/0x794
> > 259 sp : ffffff800c83b5a0 pstate : 60c00145
> > 259 Call trace:
> > 259 f2fs_do_write_data_page+0x2b4/0x794
> > 259 f2fs_write_single_data_page+0x4a4/0x764
> > 259 f2fs_write_data_pages+0x4dc/0x968
> > 259 do_writepages+0x60/0x124
> > 259 __writeback_single_inode+0xd8/0x490
> > 259 writeback_sb_inodes+0x3a8/0x6e4
> > 259 __writeback_inodes_wb+0xa4/0x14c
> > 259 wb_writeback+0x218/0x434
> > 259 wb_workfn+0x2bc/0x57c
> > 259 process_one_work+0x25c/0x440
> > 259 worker_thread+0x24c/0x480
> > 259 kthread+0x11c/0x12c
> > 259 ret_from_fork+0x10/0x18
> >
> >> f2fs_unlock_op(sbi);
> >>
> >> err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
> >> diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
> >> index ae5310f02e7f..af974ba273b3 100644
> >> --- a/fs/f2fs/recovery.c
> >> +++ b/fs/f2fs/recovery.c
> >> @@ -742,7 +742,7 @@ static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
> >> f2fs_put_page(page, 1);
> >> }
> >> if (!err)
> >> - f2fs_allocate_new_segments(sbi, NO_CHECK_TYPE);
> >> + f2fs_allocate_new_segments(sbi);
> >> return err;
> >> }
> >>
> >> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> >> index 113114f98087..f15711e8ee5b 100644
> >> --- a/fs/f2fs/segment.c
> >> +++ b/fs/f2fs/segment.c
> >> @@ -2707,28 +2707,35 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >> up_read(&SM_I(sbi)->curseg_lock);
> >> }
> >>
> >> -void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi, int type)
> >> +void __allocate_new_segment(struct f2fs_sb_info *sbi, int type)
> >> {
> >> - struct curseg_info *curseg;
> >> + struct curseg_info *curseg = CURSEG_I(sbi, type);
> >> unsigned int old_segno;
> >> - int i;
> >>
> >> - down_write(&SIT_I(sbi)->sentry_lock);
> >> + if (!curseg->next_blkoff &&
> >> + !get_valid_blocks(sbi, curseg->segno, false) &&
> >> + !get_ckpt_valid_blocks(sbi, curseg->segno))
> >> + return;
> >>
> >> - for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
> >> - if (type != NO_CHECK_TYPE && i != type)
> >> - continue;
> >> + old_segno = curseg->segno;
> >> + SIT_I(sbi)->s_ops->allocate_segment(sbi, type, true);
> >> + locate_dirty_segment(sbi, old_segno);
> >> +}
> >>
> >> - curseg = CURSEG_I(sbi, i);
> >> - if (type == NO_CHECK_TYPE || curseg->next_blkoff ||
> >> - get_valid_blocks(sbi, curseg->segno, false) ||
> >> - get_ckpt_valid_blocks(sbi, curseg->segno)) {
> >> - old_segno = curseg->segno;
> >> - SIT_I(sbi)->s_ops->allocate_segment(sbi, i, true);
> >> - locate_dirty_segment(sbi, old_segno);
> >> - }
> >> - }
> >> +void f2fs_allocate_new_segment(struct f2fs_sb_info *sbi, int type)
> >> +{
> >> + down_write(&SIT_I(sbi)->sentry_lock);
> >> + __allocate_new_segment(sbi, type);
> >> + up_write(&SIT_I(sbi)->sentry_lock);
> >> +}
> >>
> >> +void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi)
> >> +{
> >> + int i;
> >> +
> >> + down_write(&SIT_I(sbi)->sentry_lock);
> >> + for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++)
> >> + __allocate_new_segment(sbi, i);
> >> up_write(&SIT_I(sbi)->sentry_lock);
> >> }
> >>
> >> --
> >> 2.26.2
> > .
> >
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