Messages in this thread |  | | Date | Mon, 30 Mar 2020 14:10:33 +0530 | From | Sahitya Tummala <> | Subject | Re: [PATCH] f2fs: prevent meta updates while checkpoint is in progress |
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On Sat, Mar 28, 2020 at 04:38:00PM +0800, Chao Yu wrote: > Hi all, > > On 2020/3/28 3:24, Jaegeuk Kim wrote: > > Hi Sahitya, > > > > On 03/26, Sahitya Tummala wrote: > >> allocate_segment_for_resize() can cause metapage updates if > >> it requires to change the current node/data segments for resizing. > >> Stop these meta updates when there is a checkpoint already > >> in progress to prevent inconsistent CP data. > > > > Doesn't freeze|thaw_bdev(sbi->sb->s_bdev); work for you? > > That can avoid foreground ops racing? rather than background ops like > balance_fs() from kworker? >
Yes, that can only prevent foreground ops but not the background ops invoked in the context of kworker thread.
> BTW, I found that {freeze,thaw}_bdev is not enough to freeze all > foreground fs ops, it needs to use {freeze,thaw}_super instead. >
Yes, I agree.
Thanks,
> --- > fs/f2fs/gc.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c > index 26248c8936db..acdc8b99b543 100644 > --- a/fs/f2fs/gc.c > +++ b/fs/f2fs/gc.c > @@ -1538,7 +1538,7 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) > return -EINVAL; > } > > - freeze_bdev(sbi->sb->s_bdev); > + freeze_super(sbi->sb); > > shrunk_blocks = old_block_count - block_count; > secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi)); > @@ -1551,7 +1551,7 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) > sbi->user_block_count -= shrunk_blocks; > spin_unlock(&sbi->stat_lock); > if (err) { > - thaw_bdev(sbi->sb->s_bdev, sbi->sb); > + thaw_super(sbi->sb); > return err; > } > > @@ -1613,6 +1613,6 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) > } > clear_sbi_flag(sbi, SBI_IS_RESIZEFS); > mutex_unlock(&sbi->resize_mutex); > - thaw_bdev(sbi->sb->s_bdev, sbi->sb); > + thaw_super(sbi->sb); > return err; > } > -- > 2.18.0.rc1 > > > > >> > >> Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> > >> --- > >> fs/f2fs/gc.c | 2 ++ > >> 1 file changed, 2 insertions(+) > >> > >> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c > >> index 5bca560..6122bad 100644 > >> --- a/fs/f2fs/gc.c > >> +++ b/fs/f2fs/gc.c > >> @@ -1399,8 +1399,10 @@ static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start, > >> int err = 0; > >> > >> /* Move out cursegs from the target range */ > >> + f2fs_lock_op(sbi); > >> for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++) > >> allocate_segment_for_resize(sbi, type, start, end); > >> + f2fs_unlock_op(sbi); > >> > >> /* do GC to move out valid blocks in the range */ > >> for (segno = start; segno <= end; segno += sbi->segs_per_sec) { > >> -- > >> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. > >> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project. > > . > >
-- -- Sent by a consultant of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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