4.16-stable review patch. If anyone has any objections, please let me know.
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From: Steve French smfrench@gmail.com
commit 6e70c267e68d77679534dcf4aaf84e66f2cf1425 upstream.
As with NFS, which ignores sync on directory handles, fsync on a directory handle is a noop for CIFS/SMB3. Do not return an error on it. It breaks some database apps otherwise.
Signed-off-by: Steve French smfrench@gmail.com CC: Stable stable@vger.kernel.org Reviewed-by: Ronnie Sahlberg lsahlber@redhat.com Reviewed-by: Pavel Shilovsky pshilov@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/cifs/cifsfs.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
--- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -1047,6 +1047,18 @@ out: return rc; }
+/* + * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync() + * is a dummy operation. + */ +static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync) +{ + cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n", + file, datasync); + + return 0; +} + static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off, struct file *dst_file, loff_t destoff, size_t len, unsigned int flags) @@ -1181,6 +1193,7 @@ const struct file_operations cifs_dir_op .copy_file_range = cifs_copy_file_range, .clone_file_range = cifs_clone_file_range, .llseek = generic_file_llseek, + .fsync = cifs_dir_fsync, };
static void