Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.12 28/45] ceph: dont clobber i_snap_caps on non-I_NEW inode | Date | Thu, 20 May 2021 11:22:16 +0200 |
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From: Jeff Layton <jlayton@kernel.org>
[ Upstream commit d3c51ae1b8cce5bdaf91a1ce32b33cf5626075dc ]
We want the snapdir to mirror the non-snapped directory's attributes for most things, but i_snap_caps represents the caps granted on the snapshot directory by the MDS itself. A misbehaving MDS could issue different caps for the snapdir and we lose them here.
Only reset i_snap_caps when the inode is I_NEW. Also, move the setting of i_op and i_fop inside the if block since they should never change anyway.
Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/ceph/inode.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 4418d4be2907..2fd1c48ac5d7 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -87,14 +87,15 @@ struct inode *ceph_get_snapdir(struct inode *parent) inode->i_mtime = parent->i_mtime; inode->i_ctime = parent->i_ctime; inode->i_atime = parent->i_atime; - inode->i_op = &ceph_snapdir_iops; - inode->i_fop = &ceph_snapdir_fops; - ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ ci->i_rbytes = 0; ci->i_btime = ceph_inode(parent)->i_btime; - if (inode->i_state & I_NEW) + if (inode->i_state & I_NEW) { + inode->i_op = &ceph_snapdir_iops; + inode->i_fop = &ceph_snapdir_fops; + ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ unlock_new_inode(inode); + } return inode; } -- 2.30.2
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