cifs: set up recurring workqueue job to do SMB echo requests

[mv-sheeva.git] / fs / cifs / cifsglob.h

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 606ca8bb710245484d32b3ec91415d2901812da4..9c728dd5b146452b1c7b8a7400c44526a3e3d729 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -218,6 +218,7 @@ struct TCP_Server_Info {
        bool    sec_kerberosu2u;        /* supports U2U Kerberos */
        bool    sec_ntlmssp;            /* supports NTLMSSP */
        bool session_estab; /* mark when very first sess is established */
+       struct delayed_work     echo; /* echo ping workqueue job */
 #ifdef CONFIG_CIFS_FSCACHE
        struct fscache_cookie   *fscache; /* client index cache cookie */
 #endif
@@ -508,6 +509,18 @@ static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 
 #endif
 
+struct mid_q_entry;
+
+/*
+ * This is the prototype for the mid callback function. When creating one,
+ * take special care to avoid deadlocks. Things to bear in mind:
+ *
+ * - it will be called by cifsd
+ * - the GlobalMid_Lock will be held
+ * - the mid will be removed from the pending_mid_q list
+ */
+typedef void (mid_callback_t)(struct mid_q_entry *mid);
+
 /* one of these for every pending CIFS request to the server */
 struct mid_q_entry {
        struct list_head qhead; /* mids waiting on reply from this server */
@@ -519,7 +532,8 @@ struct mid_q_entry {
        unsigned long when_sent; /* time when smb send finished */
        unsigned long when_received; /* when demux complete (taken off wire) */
 #endif
-       struct task_struct *tsk;        /* task waiting for response */
+       mid_callback_t *callback; /* call completion callback */
+       void *callback_data;      /* general purpose pointer for callback */
        struct smb_hdr *resp_buf;       /* response buffer */
        int midState;   /* wish this were enum but can not pass to wait_event */
        __u8 command;   /* smb command code */