From 7cb9994754f8a36ae9e5ec4597c5c4c2d6c03832 Mon Sep 17 00:00:00 2001 From: Hu Weiwen Date: Fri, 1 Jul 2022 10:52:27 +0800 Subject: ceph: don't truncate file in atomic_open Clear O_TRUNC from the flags sent in the MDS create request. `atomic_open' is called before permission check. We should not do any modification to the file here. The caller will do the truncation afterward. Fixes: 124e68e74099 ("ceph: file operations") Signed-off-by: Hu Weiwen Reviewed-by: Xiubo Li Signed-off-by: Ilya Dryomov --- fs/ceph/file.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'fs/ceph') diff --git a/fs/ceph/file.c b/fs/ceph/file.c index cd025ff25bf0..b4e978420802 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -749,6 +749,11 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry, err = ceph_wait_on_conflict_unlink(dentry); if (err) return err; + /* + * Do not truncate the file, since atomic_open is called before the + * permission check. The caller will do the truncation afterward. + */ + flags &= ~O_TRUNC; if (flags & O_CREAT) { if (ceph_quota_is_max_files_exceeded(dir)) @@ -824,9 +829,7 @@ retry: } set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); - err = ceph_mdsc_do_request(mdsc, - (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, - req); + err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req); if (err == -ENOENT) { dentry = ceph_handle_snapdir(req, dentry); if (IS_ERR(dentry)) { -- cgit v1.2.3-70-g09d2