From: Steve French stfrench@microsoft.com
commit 716a3cf317456fa01d54398bb14ab354f50ed6a2 upstream.
xfstests generic/392 showed a problem where even after a shutdown call was made on a mount, we would still attempt to use the (now inaccessible) superblock if another mount was attempted for the same share.
Reported-by: David Howells dhowells@redhat.com Reviewed-by: David Howells dhowells@redhat.com Cc: stable@vger.kernel.org Fixes: 087f757b0129 ("cifs: add shutdown support") Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/cifs/connect.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2754,6 +2754,13 @@ cifs_match_super(struct super_block *sb,
spin_lock(&cifs_tcp_ses_lock); cifs_sb = CIFS_SB(sb); + + /* We do not want to use a superblock that has been shutdown */ + if (CIFS_MOUNT_SHUTDOWN & cifs_sb->mnt_cifs_flags) { + spin_unlock(&cifs_tcp_ses_lock); + return 0; + } + tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); if (tlink == NULL) { /* can not match superblock if tlink were ever null */