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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     piaojun <piaojun@huawei.com>, Mark Fasheh <mfasheh@versity.com>,
        Joel Becker <jlbec@evilplan.org>,
        Junxiao Bi <junxiao.bi@oracle.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 254/293] ocfs2: return -EROFS to mount.ocfs2
 if inode block is invalid
Thread-Topic: [PATCH AUTOSEL for 4.9 254/293] ocfs2: return -EROFS to
 mount.ocfs2 if inode block is invalid
Thread-Index: AQHTz5lc7y3BvHcHckefqAJBPB9tbA==
Date:   Mon, 9 Apr 2018 00:26:10 +0000
Message-ID: <20180409002239.163177-254-alexander.levin@microsoft.com>
References: <20180409002239.163177-1-alexander.levin@microsoft.com>
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From: piaojun <piaojun@huawei.com>

[ Upstream commit 025bcbde3634b2c9b316f227fed13ad6ad6817fb ]

If metadata is corrupted such as 'invalid inode block', we will get
failed by calling 'mount()' and then set filesystem readonly as below:

  ocfs2_mount
    ocfs2_initialize_super
      ocfs2_init_global_system_inodes
        ocfs2_iget
          ocfs2_read_locked_inode
            ocfs2_validate_inode_block
	      ocfs2_error
	        ocfs2_handle_error
	          ocfs2_set_ro_flag(osb, 0);  // set readonly

In this situation we need return -EROFS to 'mount.ocfs2', so that user
can fix it by fsck.  And then mount again.  In addition, 'mount.ocfs2'
should be updated correspondingly as it only return 1 for all errno.
And I will post a patch for 'mount.ocfs2' too.

Link: http://lkml.kernel.org/r/5A4302FA.2010606@huawei.com
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Alex Chen <alex.chen@huawei.com>
Reviewed-by: Joseph Qi <jiangqi903@gmail.com>
Reviewed-by: Changwei Ge <ge.changwei@h3c.com>
Reviewed-by: Gang He <ghe@suse.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 fs/ocfs2/super.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index f56fe39fab04..64dfbe5755da 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -473,9 +473,8 @@ static int ocfs2_init_global_system_inodes(struct ocfs2=
_super *osb)
 		new =3D ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 		if (!new) {
 			ocfs2_release_system_inodes(osb);
-			status =3D -EINVAL;
+			status =3D ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
 			mlog_errno(status);
-			/* FIXME: Should ERROR_RO_FS */
 			mlog(ML_ERROR, "Unable to load system inode %d, "
 			     "possibly corrupt fs?", i);
 			goto bail;
@@ -504,7 +503,7 @@ static int ocfs2_init_local_system_inodes(struct ocfs2_=
super *osb)
 		new =3D ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 		if (!new) {
 			ocfs2_release_system_inodes(osb);
-			status =3D -EINVAL;
+			status =3D ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
 			mlog(ML_ERROR, "status=3D%d, sysfile=3D%d, slot=3D%d\n",
 			     status, i, osb->slot_num);
 			goto bail;
--=20
2.15.1