[PATCH] smb/client: return EOPNOTSUPP for unsupported O_TMPFILE

[ChenXiaoSong]

From: ChenXiaoSong <chenxiaosong at kylinos.cn>

Some SMB servers return STATUS_OBJECT_NAME_NOT_FOUND or
STATUS_DELETE_PENDING when creating an O_TMPFILE.
The SMB client maps them to ENOENT.

The ENOENT error is supposed to be returned when the path
(a target directory in this case) does not exist, while a
lack of support of O_TMPFILE by the target file system should
be indicated by EOPNOTSUPP.

Reported-by: Mikhail Stefantsev <mikhail at mstefan99.com>
Fixes: 3e7d63037a2b ("smb: client: add support for O_TMPFILE")
Closes: https://lore.kernel.org/linux-cifs/75fb5359-b268-492d-8d4a-504d1af60f2a@app.fastmail.com/
Signed-off-by: ChenXiaoSong <chenxiaosong at kylinos.cn>
---
 fs/smb/client/dir.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/smb/client/dir.c b/fs/smb/client/dir.c
index 88a4a1787ff0..b0ddcaa2d815 100644
--- a/fs/smb/client/dir.c
+++ b/fs/smb/client/dir.c
@@ -1138,6 +1138,8 @@ int cifs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
 	} while (unlikely(rc == -EEXIST) && ++retries < max_retries);
 
 	if (rc) {
+		if (rc == -ENOENT)
+			rc = -EOPNOTSUPP;
 		cifs_del_pending_open(&open);
 		goto out;
 	}
-- 
2.54.0