[PATCH 2/5] ceph: Propagate dentry down to inode_change_ok()

[Jan Kara <jack@xxxxxxx>]

To avoid clearing of capabilities or security related extended
attributes too early, inode_change_ok() will need to take dentry instead
of inode. ceph_setattr() has the dentry easily available but
__ceph_setattr() is also called from ceph_set_acl() where dentry is not
easily available. Luckily that call path does not need inode_change_ok()
to be called anyway. So reorganize functions a bit so that
inode_change_ok() is called only from paths where dentry is available.

Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 fs/ceph/acl.c   |  5 +++++
 fs/ceph/inode.c | 19 +++++++++++--------
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
index 013151d50069..a2cedfde75eb 100644
--- a/fs/ceph/acl.c
+++ b/fs/ceph/acl.c
@@ -127,6 +127,11 @@ int ceph_set_acl(struct inode *inode, struct posix_acl 
*acl, int type)
                        goto out_free;
        }
 
+       if (ceph_snap(inode) != CEPH_NOSNAP) {
+               ret = -EROFS;
+               goto out_free;
+       }
+
        if (new_mode != old_mode) {
                newattrs.ia_mode = new_mode;
                newattrs.ia_valid = ATTR_MODE;
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index dd3a6dbf71eb..2aa3c0bcf3a5 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1905,13 +1905,6 @@ int __ceph_setattr(struct inode *inode, struct iattr 
*attr)
        int inode_dirty_flags = 0;
        bool lock_snap_rwsem = false;
 
-       if (ceph_snap(inode) != CEPH_NOSNAP)
-               return -EROFS;
-
-       err = inode_change_ok(inode, attr);
-       if (err != 0)
-               return err;
-
        prealloc_cf = ceph_alloc_cap_flush();
        if (!prealloc_cf)
                return -ENOMEM;
@@ -2124,7 +2117,17 @@ out_put:
  */
 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
 {
-       return __ceph_setattr(d_inode(dentry), attr);
+       struct inode *inode = d_inode(dentry);
+       int err;
+
+       if (ceph_snap(inode) != CEPH_NOSNAP)
+               return -EROFS;
+
+       err = inode_change_ok(inode, attr);
+       if (err != 0)
+               return err;
+
+       return __ceph_setattr(inode, attr);
 }
 
 /*
-- 
2.6.6