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Date: Sun, 21 Jun 2020 09:38:34 -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 1/5] f2fs: fix to wait page writeback before update
On 06/20, Chao Yu wrote:
> On 2020/6/20 6:47, Jaegeuk Kim wrote:
> > On 06/19, Chao Yu wrote:
> >> On 2020/6/19 13:49, Jaegeuk Kim wrote:
> >>> On 06/19, Chao Yu wrote:
> >>>> Hi Jaegeuk,
> >>>>
> >>>> On 2020/6/19 7:59, Jaegeuk Kim wrote:
> >>>>> Hi Chao,
> >>>>>
> >>>>> On 06/18, Chao Yu wrote:
> >>>>>> to make page content stable for special device like raid.
> >>>>>
> >>>>> Could you elaborate the problem a bit?
> >>>>
> >>>> Some devices like raid5 wants page content to be stable, because
> >>>> it will calculate parity info based page content, if page is not
> >>>> stable, parity info could be corrupted, result in data inconsistency
> >>>> in stripe.
> >>>
> >>> I don't get the point, since those pages are brand new pages which were not
> >>> modified before. If it's on writeback, we should not modify them regardless
> >>> of whatever raid configuration. For example, f2fs_new_node_page() waits for
> >>> writeback. Am I missing something?
> >>
> >> I think we should use f2fs_bug_on(, PageWriteback()) rather than
> >> f2fs_wait_on_page_writeback() for brand new page which is allocated just now.
> >> For other paths, we can keep rule that waiting for writeback before updating.
> >>
> >> How do you think?
> >>
> >> Thanks,
> >>
> >>>
> >>>>
> >>>> Thanks,
> >>>>
> >>>>>
> >>>>>>
> >>>>>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> >>>>>> ---
> >>>>>> fs/f2fs/dir.c | 2 ++
> >>>>>> fs/f2fs/extent_cache.c | 18 +++++++++---------
> >>>>>> fs/f2fs/f2fs.h | 2 +-
> >>>>>> fs/f2fs/file.c | 1 +
> >>>>>> fs/f2fs/inline.c | 2 ++
> >>>>>> fs/f2fs/inode.c | 3 +--
> >>>>>> 6 files changed, 16 insertions(+), 12 deletions(-)
> >>>>>>
> >>>>>> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
> >>>>>> index d35976785e8c..91e86747a604 100644
> >>>>>> --- a/fs/f2fs/dir.c
> >>>>>> +++ b/fs/f2fs/dir.c
> >>>>>> @@ -495,6 +495,8 @@ static int make_empty_dir(struct inode *inode,
> >>>>>> if (IS_ERR(dentry_page))
> >>>>>> return PTR_ERR(dentry_page);
> >>>>>>
> >>>>>> + f2fs_bug_on(F2FS_I_SB(inode), PageWriteback(dentry_page));
> >>>>>> +
> >>>>>> dentry_blk = page_address(dentry_page);
> >>>>>>
> >>>>>> make_dentry_ptr_block(NULL, &d, dentry_blk);
> >>>>>> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
> >>>>>> index e60078460ad1..686c68b98610 100644
> >>>>>> --- a/fs/f2fs/extent_cache.c
> >>>>>> +++ b/fs/f2fs/extent_cache.c
> >>>>>> @@ -325,9 +325,10 @@ static void __drop_largest_extent(struct extent_tree *et,
> >>>>>> }
> >>>>>>
> >>>>>> /* return true, if inode page is changed */
> >>>>>> -static bool __f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext)
> >>>>>> +static void __f2fs_init_extent_tree(struct inode *inode, struct page *ipage)
> >>>>>> {
> >>>>>> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> >>>>>> + struct f2fs_extent *i_ext = ipage ? &F2FS_INODE(ipage)->i_ext : NULL;
> >>>>>> struct extent_tree *et;
> >>>>>> struct extent_node *en;
> >>>>>> struct extent_info ei;
> >>>>>> @@ -335,16 +336,18 @@ static bool __f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_e
> >>>>>> if (!f2fs_may_extent_tree(inode)) {
> >>>>>> /* drop largest extent */
> >>>>>> if (i_ext && i_ext->len) {
> >>>>>> + f2fs_wait_on_page_writeback(ipage, NODE, true, true);
> >>>>>> i_ext->len = 0;
> >>>>>> - return true;
> >>>>>> + set_page_dirty(ipage);
> >>>>>> + return;
> >>>>>> }
> >>>>>> - return false;
> >>>>>> + return;
> >>>>>> }
> >>>>>>
> >>>>>> et = __grab_extent_tree(inode);
> >>>>>>
> >>>>>> if (!i_ext || !i_ext->len)
> >>>>>> - return false;
> >>>>>> + return;
> >>>>>>
> >>>>>> get_extent_info(&ei, i_ext);
> >>>>>>
> >>>>>> @@ -360,17 +363,14 @@ static bool __f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_e
> >>>>>> }
> >>>>>> out:
> >>>>>> write_unlock(&et->lock);
> >>>>>> - return false;
> >>>>>> }
> >>>>>>
> >>>>>> -bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext)
> >>>>>> +void f2fs_init_extent_tree(struct inode *inode, struct page *ipage)
> >>>>>> {
> >>>>>> - bool ret = __f2fs_init_extent_tree(inode, i_ext);
> >>>>>> + __f2fs_init_extent_tree(inode, ipage);
> >>>>>>
> >>>>>> if (!F2FS_I(inode)->extent_tree)
> >>>>>> set_inode_flag(inode, FI_NO_EXTENT);
> >>>>>> -
> >>>>>> - return ret;
> >>>>>> }
> >>>>>>
> >>>>>> static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
> >>>>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> >>>>>> index b35a50f4953c..326c12fa0da5 100644
> >>>>>> --- a/fs/f2fs/f2fs.h
> >>>>>> +++ b/fs/f2fs/f2fs.h
> >>>>>> @@ -3795,7 +3795,7 @@ struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root_cached *root,
> >>>>>> bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi,
> >>>>>> struct rb_root_cached *root);
> >>>>>> unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink);
> >>>>>> -bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext);
> >>>>>> +void f2fs_init_extent_tree(struct inode *inode, struct page *ipage);
> >>>>>> void f2fs_drop_extent_tree(struct inode *inode);
> >>>>>> unsigned int f2fs_destroy_extent_node(struct inode *inode);
> >>>>>> void f2fs_destroy_extent_tree(struct inode *inode);
> >>>>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> >>>>>> index 3268f8dd59bb..1862073b96d2 100644
> >>>>>> --- a/fs/f2fs/file.c
> >>>>>> +++ b/fs/f2fs/file.c
> >>>>>> @@ -1250,6 +1250,7 @@ static int __clone_blkaddrs(struct inode *src_inode, struct inode *dst_inode,
> >>>>>> f2fs_put_page(psrc, 1);
> >>>>>> return PTR_ERR(pdst);
> >>>>>> }
> >>>>>> + f2fs_wait_on_page_writeback(pdst, DATA, true, true);
> >
> > Do you mean pdst can be under writeback?
>
> Use f2fs_bug_on(, dirty || writeback) here?
>
> >
> >>>>>> f2fs_copy_page(psrc, pdst);
> >>>>>> set_page_dirty(pdst);
> >>>>>> f2fs_put_page(pdst, 1);
> >>>>>> diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
> >>>>>> index dbade310dc79..4bcbc486c9e2 100644
> >>>>>> --- a/fs/f2fs/inline.c
> >>>>>> +++ b/fs/f2fs/inline.c
> >>>>>> @@ -340,6 +340,8 @@ int f2fs_make_empty_inline_dir(struct inode *inode, struct inode *parent,
> >>>>>> struct f2fs_dentry_ptr d;
> >>>>>> void *inline_dentry;
> >>>>>>
> >>>>>> + f2fs_wait_on_page_writeback(ipage, NODE, true, true);
>
> f2fs_bug_on(, writeback)?
So, which case do you suspect unstable page for raid?
>
> Thanks,
>
> >>>>>> +
> >>>>>> inline_dentry = inline_data_addr(inode, ipage);
> >>>>>>
> >>>>>> make_dentry_ptr_inline(inode, &d, inline_dentry);
> >>>>>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> >>>>>> index 44582a4db513..7c156eb26dd7 100644
> >>>>>> --- a/fs/f2fs/inode.c
> >>>>>> +++ b/fs/f2fs/inode.c
> >>>>>> @@ -367,8 +367,7 @@ static int do_read_inode(struct inode *inode)
> >>>>>> fi->i_pino = le32_to_cpu(ri->i_pino);
> >>>>>> fi->i_dir_level = ri->i_dir_level;
> >>>>>>
> >>>>>> - if (f2fs_init_extent_tree(inode, &ri->i_ext))
> >>>>>> - set_page_dirty(node_page);
> >>>>>> + f2fs_init_extent_tree(inode, node_page);
> >>>>>>
> >>>>>> get_inline_info(inode, ri);
> >>>>>>
> >>>>>> --
> >>>>>> 2.18.0.rc1
> >>>>> .
> >>>>>
> >>> .
> >>>
> > .
> >
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