CIFS: Respect epoch value from create lease context v2
that force a client to purge cache pages when a server requests it.
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 3811893..cfa14c8 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -373,11 +373,12 @@
/* if we can do cache read operations */
bool (*is_read_op)(__u32);
/* set oplock level for the inode */
- void (*set_oplock_level)(struct cifsInodeInfo *, __u32);
+ void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
+ bool *);
/* create lease context buffer for CREATE request */
char * (*create_lease_buf)(u8 *, u8);
- /* parse lease context buffer and return oplock info */
- __u8 (*parse_lease_buf)(void *);
+ /* parse lease context buffer and return oplock/epoch info */
+ __u8 (*parse_lease_buf)(void *, unsigned int *);
};
struct smb_version_values {
@@ -940,6 +941,8 @@
__u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
#endif
struct cifs_pending_open *pending_open;
+ unsigned int epoch;
+ bool purge_cache;
};
struct cifs_fid_locks {
@@ -1039,7 +1042,10 @@
#define CIFS_CACHE_READ_FLG 1
#define CIFS_CACHE_HANDLE_FLG 2
+#define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_WRITE_FLG 4
+#define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
+#define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_READ(cinode) (cinode->oplock & CIFS_CACHE_READ_FLG)
#define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
@@ -1057,6 +1063,7 @@
struct list_head openFileList;
__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
unsigned int oplock; /* oplock/lease level we have */
+ unsigned int epoch; /* used to track lease state changes */
bool delete_pending; /* DELETE_ON_CLOSE is set */
bool invalid_mapping; /* pagecache is invalid */
unsigned long time; /* jiffies of last update of inode */