linux-kernel - [PATCH 3.16 233/366] cifs: store the leaseKey in the fid on SMB2

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Date:   Sun, 11 Nov 2018 19:49:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Steve French" <smfrench@...il.com>,
        "Ronnie Sahlberg" <lsahlber@...hat.com>,
        "Pavel Shilovsky" <pshilov@...rosoft.com>
Subject: [PATCH 3.16 233/366] cifs: store the leaseKey in the fid on SMB2_open

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ronnie Sahlberg <lsahlber@...hat.com>

commit 96164ab2d880c9539989bea68d4790f6fd619b1f upstream.

In SMB2_open(), if we got a lease we need to store this in the fid structure
or else we will never be able to map a lease break back to which file/fid
it applies to.

Signed-off-by: Ronnie Sahlberg <lsahlber@...hat.com>
Reviewed-by: Pavel Shilovsky <pshilov@...rosoft.com>
Signed-off-by: Steve French <smfrench@...il.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/cifs/cifsglob.h | 2 +-
 fs/cifs/smb2ops.c  | 7 +++++--
 fs/cifs/smb2pdu.c  | 8 +++++---
 3 files changed, 11 insertions(+), 6 deletions(-)

--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -383,7 +383,7 @@ struct smb_version_operations {
 	/* create lease context buffer for CREATE request */
 	char * (*create_lease_buf)(u8 *, u8);
 	/* parse lease context buffer and return oplock/epoch info */
-	__u8 (*parse_lease_buf)(void *, unsigned int *);
+	__u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
 	int (*clone_range)(const unsigned int, struct cifsFileInfo *src_file,
 			struct cifsFileInfo *target_file, u64 src_off, u64 len,
 			u64 dest_off);
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1118,7 +1118,7 @@ smb3_create_lease_buf(u8 *lease_key, u8
 }
 
 static __u8
-smb2_parse_lease_buf(void *buf, unsigned int *epoch)
+smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
 {
 	struct create_lease *lc = (struct create_lease *)buf;
 
@@ -1129,13 +1129,16 @@ smb2_parse_lease_buf(void *buf, unsigned
 }
 
 static __u8
-smb3_parse_lease_buf(void *buf, unsigned int *epoch)
+smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
 {
 	struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
 
 	*epoch = le16_to_cpu(lc->lcontext.Epoch);
 	if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 		return SMB2_OPLOCK_LEVEL_NOCHANGE;
+	if (lease_key)
+		memcpy(lease_key, &lc->lcontext.LeaseKeyLow,
+		       SMB2_LEASE_KEY_SIZE);
 	return le32_to_cpu(lc->lcontext.LeaseState);
 }
 
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1054,7 +1054,7 @@ create_reconnect_durable_buf(struct cifs
 
 static __u8
 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
-		  unsigned int *epoch)
+		  unsigned int *epoch, char *lease_key)
 {
 	char *data_offset;
 	struct create_context *cc;
@@ -1069,7 +1069,8 @@ parse_lease_state(struct TCP_Server_Info
 		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
 		if (le16_to_cpu(cc->NameLength) == 4 &&
 		    strncmp(name, "RqLs", 4) == 0)
-			return server->ops->parse_lease_buf(cc, epoch);
+			return server->ops->parse_lease_buf(cc, epoch,
+							    lease_key);
 
 		next = le32_to_cpu(cc->Next);
 		if (!next)
@@ -1262,7 +1263,8 @@ SMB2_open(const unsigned int xid, struct
 	}
 
 	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
-		*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
+		*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
+					    oparms->fid->lease_key);
 	else
 		*oplock = rsp->OplockLevel;
 creat_exit: