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Commit a6827c18 authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
Browse files

cifs: add cifs_call_async 



Add a function that will send a request, and set up the mid for an
async reply.

Reviewed-by: default avatarSuresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 2b84a36c

fs/cifs/cifsproto.h

+5 −0
Original line number Diff line number Diff line
@@ -61,6 +61,11 @@ extern char *cifs_compose_mount_options(const char *sb_mountdata, 
		const char *fullpath, const struct dfs_info3_param *ref,

		char **devname);

/* extern void renew_parental_timestamps(struct dentry *direntry);*/

extern struct mid_q_entry *AllocMidQEntry(const struct smb_hdr *smb_buffer,

					struct TCP_Server_Info *server);

extern int cifs_call_async(struct TCP_Server_Info *server,

			   struct smb_hdr *in_buf, mid_callback_t *callback,

			   void *cbdata);

extern int SendReceive(const unsigned int /* xid */ , struct cifsSesInfo *,

			struct smb_hdr * /* input */ ,

			struct smb_hdr * /* out */ ,

fs/cifs/transport.c

+57 −1
Original line number Diff line number Diff line
@@ -42,7 +42,7 @@ wake_up_task(struct mid_q_entry *mid) 
	wake_up_process(mid->callback_data);

}



static struct mid_q_entry *

struct mid_q_entry *

AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)

{

	struct mid_q_entry *temp;
@@ -344,6 +344,62 @@ wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) 
}





/*

 * Send a SMB request and set the callback function in the mid to handle

 * the result. Caller is responsible for dealing with timeouts.

 */

int

cifs_call_async(struct TCP_Server_Info *server, struct smb_hdr *in_buf,

		mid_callback_t *callback, void *cbdata)

{

	int rc;

	struct mid_q_entry *mid;



	rc = wait_for_free_request(server, CIFS_ASYNC_OP);

	if (rc)

		return rc;



	mutex_lock(&server->srv_mutex);

	mid = AllocMidQEntry(in_buf, server);

	if (mid == NULL) {

		mutex_unlock(&server->srv_mutex);

		return -ENOMEM;

	}



	/* put it on the pending_mid_q */

	spin_lock(&GlobalMid_Lock);

	list_add_tail(&mid->qhead, &server->pending_mid_q);

	spin_unlock(&GlobalMid_Lock);



	rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);

	if (rc) {

		mutex_unlock(&server->srv_mutex);

		goto out_err;

	}



	mid->callback = callback;

	mid->callback_data = cbdata;

	mid->midState = MID_REQUEST_SUBMITTED;

#ifdef CONFIG_CIFS_STATS2

	atomic_inc(&server->inSend);

#endif

	rc = smb_send(server, in_buf, in_buf->smb_buf_length);

#ifdef CONFIG_CIFS_STATS2

	atomic_dec(&server->inSend);

	mid->when_sent = jiffies;

#endif

	mutex_unlock(&server->srv_mutex);

	if (rc)

		goto out_err;



	return rc;

out_err:

	delete_mid(mid);

	atomic_dec(&server->inFlight);

	wake_up(&server->request_q);

	return rc;

}



/*

 *

 * Send an SMB Request.  No response info (other than return code)