From: piaojun <piao...@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.2010...@huawei.com
Signed-off-by: Jun Piao <piao...@huawei.com>
Reviewed-by: Alex Chen <alex.c...@huawei.com>
Reviewed-by: Joseph Qi <jiangqi...@gmail.com>
Reviewed-by: Changwei Ge <ge.chang...@h3c.com>
Reviewed-by: Gang He <g...@suse.com>
Cc: Mark Fasheh <mfas...@versity.com>
Cc: Joel Becker <jl...@evilplan.org>
Cc: Junxiao Bi <junxiao...@oracle.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.le...@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 = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
                if (!new) {
                        ocfs2_release_system_inodes(osb);
-                       status = -EINVAL;
+                       status = 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 = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
                if (!new) {
                        ocfs2_release_system_inodes(osb);
-                       status = -EINVAL;
+                       status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
                        mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
                             status, i, osb->slot_num);
                        goto bail;
-- 
2.15.1

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