linux-kernel - [PATCH 5.15 066/171] jbd2: export jbd2_journal_[grab|put]_journal

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Date:   Mon, 31 Jan 2022 11:55:31 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Junxiao Bi <junxiao.bi@...cle.com>,
        Changwei Ge <gechangwei@...e.cn>, Gang He <ghe@...e.com>,
        Jun Piao <piaojun@...wei.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Gautham Ananthakrishna <gautham.ananthakrishna@...cle.com>,
        Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>,
        "Theodore Tso" <tytso@....edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.15 066/171] jbd2: export jbd2_journal_[grab|put]_journal_head

From: Joseph Qi <joseph.qi@...ux.alibaba.com>

commit 4cd1103d8c66b2cdb7e64385c274edb0ac5e8887 upstream.

Patch series "ocfs2: fix a deadlock case".

This fixes a deadlock case in ocfs2.  We firstly export jbd2 symbols
jbd2_journal_[grab|put]_journal_head as preparation and later use them
in ocfs2 insread of jbd_[lock|unlock]_bh_journal_head to fix the
deadlock.

This patch (of 2):

This exports symbols jbd2_journal_[grab|put]_journal_head, which will be
used outside modules, e.g.  ocfs2.

Link: https://lkml.kernel.org/r/20220121071205.100648-2-joseph.qi@linux.alibaba.com
Signed-off-by: Joseph Qi <joseph.qi@...ux.alibaba.com>
Cc: Mark Fasheh <mark@...heh.com>
Cc: Joel Becker <jlbec@...lplan.org>
Cc: Junxiao Bi <junxiao.bi@...cle.com>
Cc: Changwei Ge <gechangwei@...e.cn>
Cc: Gang He <ghe@...e.com>
Cc: Jun Piao <piaojun@...wei.com>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>
Cc: Gautham Ananthakrishna <gautham.ananthakrishna@...cle.com>
Cc: Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/jbd2/journal.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2970,6 +2970,7 @@ struct journal_head *jbd2_journal_grab_j
 	jbd_unlock_bh_journal_head(bh);
 	return jh;
 }
+EXPORT_SYMBOL(jbd2_journal_grab_journal_head);
 
 static void __journal_remove_journal_head(struct buffer_head *bh)
 {
@@ -3022,6 +3023,7 @@ void jbd2_journal_put_journal_head(struc
 		jbd_unlock_bh_journal_head(bh);
 	}
 }
+EXPORT_SYMBOL(jbd2_journal_put_journal_head);
 
 /*
  * Initialize jbd inode head