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Message-ID: <20191203222833.GB3430290@kroah.com> Date: Tue, 3 Dec 2019 23:28:33 +0100 From: Greg KH <greg@...ah.com> To: linux-kernel@...r.kernel.org Cc: zhengliang6@...wei.com, stable-commits@...r.kernel.org Subject: Re: Patch "f2fs: fix to data block override node segment by mistake" has been added to the 4.14-stable tree On Sun, Dec 01, 2019 at 10:19:12AM -0500, Sasha Levin wrote: > This is a note to let you know that I've just added the patch titled > > f2fs: fix to data block override node segment by mistake > > to the 4.14-stable tree which can be found at: > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary > > The filename of the patch is: > f2fs-fix-to-data-block-override-node-segment-by-mist.patch > and it can be found in the queue-4.14 subdirectory. > > If you, or anyone else, feels it should not be added to the stable tree, > please let <stable@...r.kernel.org> know about it. > > > > commit 533b6950b413fd564fb6a3e1f64f53e959c9b999 > Author: zhengliang <zhengliang6@...wei.com> > Date: Mon Mar 4 09:32:25 2019 +0800 > > f2fs: fix to data block override node segment by mistake > > [ Upstream commit a0770e13c8da83bdb64738c0209ab02dd3cfff8b ] > > v4: Rearrange the previous three versions. > > The following scenario could lead to data block override by mistake. > > TASK A | TASK kworker | TASK B | TASK C > | | | > open | | | > write | | | > close | | | > | f2fs_write_data_pages | | > | f2fs_write_cache_pages | | > | f2fs_outplace_write_data | | > | f2fs_allocate_data_block (get block in seg S, | | > | S is full, and only | | > | have this valid data | | > | block) | | > | allocate_segment | | > | locate_dirty_segment (mark S as PRE) | | > | f2fs_submit_page_write (submit but is not | | > | written on dev) | | > unlink | | | > iput_final | | | > f2fs_drop_inode | | | > f2fs_truncate | | | > (not evict) | | | > | | write_checkpoint | > | | flush merged bio but not wait file data writeback | > | | set_prefree_as_free (mark S as FREE) | > | | | update NODE/DATA > | | | allocate_segment (select S) > | writeback done | | > > So we need to guarantee io complete before truncate inode in f2fs_drop_inode. > > Reviewed-by: Chao Yu <yuchao0@...wei.com> > Signed-off-by: Zheng Liang <zhengliang6@...wei.com> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org> > Signed-off-by: Sasha Levin <sashal@...nel.org> > > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c > index e4aabfc21bd43..9554338f9c35d 100644 > --- a/fs/f2fs/super.c > +++ b/fs/f2fs/super.c > @@ -668,6 +668,10 @@ static int f2fs_drop_inode(struct inode *inode) > sb_start_intwrite(inode->i_sb); > f2fs_i_size_write(inode, 0); > > + f2fs_submit_merged_write_cond(F2FS_I_SB(inode), > + inode, NULL, 0, DATA); > + truncate_inode_pages_final(inode->i_mapping); > + > if (F2FS_HAS_BLOCKS(inode)) > f2fs_truncate(inode); > Also dropped from 4.14.y queue as this gives the same warning as on 4.19.y greg k-h
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