This is a note to let you know that I've just added the patch titled
ceph: don't truncate file in atomic_open
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ceph-don-t-truncate-file-in-atomic_open.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7cb9994754f8a36ae9e5ec4597c5c4c2d6c03832 Mon Sep 17 00:00:00 2001
From: Hu Weiwen <sehuww@xxxxxxxxxxxxxxxx>
Date: Fri, 1 Jul 2022 10:52:27 +0800
Subject: ceph: don't truncate file in atomic_open
From: Hu Weiwen <sehuww@xxxxxxxxxxxxxxxx>
commit 7cb9994754f8a36ae9e5ec4597c5c4c2d6c03832 upstream.
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 <sehuww@xxxxxxxxxxxxxxxx>
Reviewed-by: Xiubo Li <xiubli@xxxxxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
[Xiubo: fixed a trivial conflict for 5.10 backport]
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ceph/file.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -703,6 +703,12 @@ int ceph_atomic_open(struct inode *dir,
if (dentry->d_name.len > NAME_MAX)
return -ENAMETOOLONG;
+ /*
+ * 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))
return -EDQUOT;
@@ -769,9 +775,7 @@ 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);
err = ceph_handle_snapdir(req, dentry, err);
if (err)
goto out_req;
Patches currently in stable-queue which might be from sehuww@xxxxxxxxxxxxxxxx are
queue-5.10/ceph-don-t-truncate-file-in-atomic_open.patch
