4.4-stable review patch. If anyone has any objections, please let me know.
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From: Steve French stfrench@microsoft.com
commit fd09b7d3b352105f08b8e02f7afecf7e816380ef upstream.
An earlier commit had a typo which prevented the optimization from working:
commit 18dd8e1a65dd ("Do not send SMB3 SET_INFO request if nothing is changing")
Thank you to Metze for noticing this. Also clear a reserved field in the FILE_BASIC_INFO struct we send that should be zero (all the other fields in that struct were set or cleared explicitly already in cifs_set_file_info).
Reviewed-by: Pavel Shilovsky pshilov@microsoft.com CC: Stable stable@vger.kernel.org # 4.9.x+ Reported-by: Stefan Metzmacher metze@samba.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/cifs/inode.c | 2 ++ fs/cifs/smb2inode.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-)
--- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -1063,6 +1063,8 @@ cifs_set_file_info(struct inode *inode, if (!server->ops->set_file_info) return -ENOSYS;
+ info_buf.Pad = 0; + if (attrs->ia_valid & ATTR_ATIME) { set_time = true; info_buf.LastAccessTime = --- a/fs/cifs/smb2inode.c +++ b/fs/cifs/smb2inode.c @@ -267,7 +267,7 @@ smb2_set_file_info(struct inode *inode, int rc;
if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) && - (buf->LastWriteTime == 0) && (buf->ChangeTime) && + (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) && (buf->Attributes == 0)) return 0; /* would be a no op, no sense sending this */