From 153322f7536a181e4d1b288aa6f01c0ce65f5c7c Mon Sep 17 00:00:00 2001 From: Steve French Date: Thu, 28 Mar 2019 22:32:49 -0500 Subject: smb3: Fix enumerating snapshots to Azure Some servers (see MS-SMB2 protocol specification section 3.3.5.15.1) expect that the FSCTL enumerate snapshots is done twice, with the first query having EXACTLY the minimum size response buffer requested (16 bytes) which refreshes the snapshot list (otherwise that and subsequent queries get an empty list returned). So had to add code to set the maximum response size differently for the first snapshot query (which gets the size needed for the second query which contains the actual list of snapshots). Signed-off-by: Steve French Reviewed-by: Ronnie Sahlberg Reviewed-by: Pavel Shilovsky CC: Stable # 4.19+ --- fs/cifs/smb2file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/cifs/smb2file.c') diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c index b204e84b87fb..ac97e0c01d4e 100644 --- a/fs/cifs/smb2file.c +++ b/fs/cifs/smb2file.c @@ -74,7 +74,7 @@ smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms, fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY, true /* is_fsctl */, (char *)&nr_ioctl_req, sizeof(nr_ioctl_req), - NULL, NULL /* no return info */); + CIFSMaxBufSize, NULL, NULL /* no return info */); if (rc == -EOPNOTSUPP) { cifs_dbg(VFS, "resiliency not supported by server, disabling\n"); -- cgit v1.2.3-59-g8ed1b