[PATCH v5 4/4] ceph: Remove S_ISGID clear code in ceph_finish_async_create

[Yang Xu <xuyang2018.jy@xxxxxxxxxxx>]

Since vfs has stripped S_ISGID in the previous patch, the calltrace
as below:

vfs:	lookup_open
	...
	  if (open_flag & O_CREAT) {
                if (open_flag & O_EXCL)
                        open_flag &= ~O_TRUNC;
                mode = prepare_mode(mnt_userns, dir->d_inode, mode);
	...
	   dir_inode->i_op->atomic_open

ceph:	ceph_atomic_open
	...
	      if (flags & O_CREAT)
            		ceph_finish_async_create

We have stripped sgid in prepare_mode, so remove this useless clear
code directly.

Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxx>
---
 fs/ceph/file.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 6c9e837aa1d3..8e3b99853333 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -651,10 +651,6 @@ static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry,
 		/* Directories always inherit the setgid bit. */
 		if (S_ISDIR(mode))
 			mode |= S_ISGID;
-		else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
-			 !in_group_p(dir->i_gid) &&
-			 !capable_wrt_inode_uidgid(&init_user_ns, dir, CAP_FSETID))
-			mode &= ~S_ISGID;
 	} else {
 		in.gid = cpu_to_le32(from_kgid(&init_user_ns, current_fsgid()));
 	}
-- 
2.27.0