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Message-ID: <20241203145403.5yas7kngvf4gzb6d@quack3> Date: Tue, 3 Dec 2024 15:54:03 +0100 From: Jan Kara <jack@...e.cz> To: Zhang Yi <yi.zhang@...weicloud.com> Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz, yi.zhang@...wei.com, chengzhihao1@...wei.com, yukuai3@...wei.com, yangerkun@...wei.com Subject: Re: [PATCH 2/2] jbd2: flush filesystem device before updating tail sequence On Tue 03-12-24 09:44:07, Zhang Yi wrote: > From: Zhang Yi <yi.zhang@...wei.com> > > When committing transaction in jbd2_journal_commit_transaction(), the > disk caches for the filesystem device should be flushed before updating > the journal tail sequence. However, this step is missed if the journal > is not located on the filesystem device. As a result, the filesystem may > become inconsistent following a power failure or system crash. Fix it by > ensuring that the filesystem device is flushed appropriately. > > Fixes: 3339578f0578 ("jbd2: cleanup journal tail after transaction commit") > Signed-off-by: Zhang Yi <yi.zhang@...wei.com> Ah, good catch. Feel free to add: Reviewed-by: Jan Kara <jack@...e.cz> Honza > --- > fs/jbd2/commit.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c > index 4305a1ac808a..f95cf272a1b5 100644 > --- a/fs/jbd2/commit.c > +++ b/fs/jbd2/commit.c > @@ -776,9 +776,9 @@ void jbd2_journal_commit_transaction(journal_t *journal) > /* > * If the journal is not located on the file system device, > * then we must flush the file system device before we issue > - * the commit record > + * the commit record and update the journal tail sequence. > */ > - if (commit_transaction->t_need_data_flush && > + if ((commit_transaction->t_need_data_flush || update_tail) && > (journal->j_fs_dev != journal->j_dev) && > (journal->j_flags & JBD2_BARRIER)) > blkdev_issue_flush(journal->j_fs_dev); > -- > 2.46.1 > -- Jan Kara <jack@...e.com> SUSE Labs, CR
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