1 files changed, 0 insertions, 286 deletions
diff --git a/ANDROID_3.4.5/drivers/md/dm-log-userspace-transfer.c b/ANDROID_3.4.5/drivers/md/dm-log-userspace-transfer.c
deleted file mode 100644
index 08d9a207..00000000
--- a/ANDROID_3.4.5/drivers/md/dm-log-userspace-transfer.c
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- * Copyright (C) 2006-2009 Red Hat, Inc.
- *
- * This file is released under the LGPL.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <net/sock.h>
-#include <linux/workqueue.h>
-#include <linux/connector.h>
-#include <linux/device-mapper.h>
-#include <linux/dm-log-userspace.h>
-
-#include "dm-log-userspace-transfer.h"
-
-static uint32_t dm_ulog_seq;
-
-/*
- * Netlink/Connector is an unreliable protocol.  How long should
- * we wait for a response before assuming it was lost and retrying?
- * (If we do receive a response after this time, it will be discarded
- * and the response to the resent request will be waited for.
- */
-#define DM_ULOG_RETRY_TIMEOUT (15 * HZ)
-
-/*
- * Pre-allocated space for speed
- */
-#define DM_ULOG_PREALLOCED_SIZE 512
-static struct cn_msg *prealloced_cn_msg;
-static struct dm_ulog_request *prealloced_ulog_tfr;
-
-static struct cb_id ulog_cn_id = {
-	.idx = CN_IDX_DM,
-	.val = CN_VAL_DM_USERSPACE_LOG
-};
-
-static DEFINE_MUTEX(dm_ulog_lock);
-
-struct receiving_pkg {
-	struct list_head list;
-	struct completion complete;
-
-	uint32_t seq;
-
-	int error;
-	size_t *data_size;
-	char *data;
-};
-
-static DEFINE_SPINLOCK(receiving_list_lock);
-static struct list_head receiving_list;
-
-static int dm_ulog_sendto_server(struct dm_ulog_request *tfr)
-{
-	int r;
-	struct cn_msg *msg = prealloced_cn_msg;
-
-	memset(msg, 0, sizeof(struct cn_msg));
-
-	msg->id.idx = ulog_cn_id.idx;
-	msg->id.val = ulog_cn_id.val;
-	msg->ack = 0;
-	msg->seq = tfr->seq;
-	msg->len = sizeof(struct dm_ulog_request) + tfr->data_size;
-
-	r = cn_netlink_send(msg, 0, gfp_any());
-
-	return r;
-}
-
-/*
- * Parameters for this function can be either msg or tfr, but not
- * both.  This function fills in the reply for a waiting request.
- * If just msg is given, then the reply is simply an ACK from userspace
- * that the request was received.
- *
- * Returns: 0 on success, -ENOENT on failure
- */
-static int fill_pkg(struct cn_msg *msg, struct dm_ulog_request *tfr)
-{
-	uint32_t rtn_seq = (msg) ? msg->seq : (tfr) ? tfr->seq : 0;
-	struct receiving_pkg *pkg;
-
-	/*
-	 * The 'receiving_pkg' entries in this list are statically
-	 * allocated on the stack in 'dm_consult_userspace'.
-	 * Each process that is waiting for a reply from the user
-	 * space server will have an entry in this list.
-	 *
-	 * We are safe to do it this way because the stack space
-	 * is unique to each process, but still addressable by
-	 * other processes.
-	 */
-	list_for_each_entry(pkg, &receiving_list, list) {
-		if (rtn_seq != pkg->seq)
-			continue;
-
-		if (msg) {
-			pkg->error = -msg->ack;
-			/*
-			 * If we are trying again, we will need to know our
-			 * storage capacity.  Otherwise, along with the
-			 * error code, we make explicit that we have no data.
-			 */
-			if (pkg->error != -EAGAIN)
-				*(pkg->data_size) = 0;
-		} else if (tfr->data_size > *(pkg->data_size)) {
-			DMERR("Insufficient space to receive package [%u] "
-			      "(%u vs %zu)", tfr->request_type,
-			      tfr->data_size, *(pkg->data_size));
-
-			*(pkg->data_size) = 0;
-			pkg->error = -ENOSPC;
-		} else {
-			pkg->error = tfr->error;
-			memcpy(pkg->data, tfr->data, tfr->data_size);
-			*(pkg->data_size) = tfr->data_size;
-		}
-		complete(&pkg->complete);
-		return 0;
-	}
-
-	return -ENOENT;
-}
-
-/*
- * This is the connector callback that delivers data
- * that was sent from userspace.
- */
-static void cn_ulog_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
-{
-	struct dm_ulog_request *tfr = (struct dm_ulog_request *)(msg + 1);
-
-	if (!capable(CAP_SYS_ADMIN))
-		return;
-
-	spin_lock(&receiving_list_lock);
-	if (msg->len == 0)
-		fill_pkg(msg, NULL);
-	else if (msg->len < sizeof(*tfr))
-		DMERR("Incomplete message received (expected %u, got %u): [%u]",
-		      (unsigned)sizeof(*tfr), msg->len, msg->seq);
-	else
-		fill_pkg(NULL, tfr);
-	spin_unlock(&receiving_list_lock);
-}
-
-/**
- * dm_consult_userspace
- * @uuid: log's universal unique identifier (must be DM_UUID_LEN in size)
- * @luid: log's local unique identifier
- * @request_type:  found in include/linux/dm-log-userspace.h
- * @data: data to tx to the server
- * @data_size: size of data in bytes
- * @rdata: place to put return data from server
- * @rdata_size: value-result (amount of space given/amount of space used)
- *
- * rdata_size is undefined on failure.
- *
- * Memory used to communicate with userspace is zero'ed
- * before populating to ensure that no unwanted bits leak
- * from kernel space to user-space.  All userspace log communications
- * between kernel and user space go through this function.
- *
- * Returns: 0 on success, -EXXX on failure
- **/
-int dm_consult_userspace(const char *uuid, uint64_t luid, int request_type,
-			 char *data, size_t data_size,
-			 char *rdata, size_t *rdata_size)
-{
-	int r = 0;
-	size_t dummy = 0;
-	int overhead_size = sizeof(struct dm_ulog_request) + sizeof(struct cn_msg);
-	struct dm_ulog_request *tfr = prealloced_ulog_tfr;
-	struct receiving_pkg pkg;
-
-	/*
-	 * Given the space needed to hold the 'struct cn_msg' and
-	 * 'struct dm_ulog_request' - do we have enough payload
-	 * space remaining?
-	 */
-	if (data_size > (DM_ULOG_PREALLOCED_SIZE - overhead_size)) {
-		DMINFO("Size of tfr exceeds preallocated size");
-		return -EINVAL;
-	}
-
-	if (!rdata_size)
-		rdata_size = &dummy;
-resend:
-	/*
-	 * We serialize the sending of requests so we can
-	 * use the preallocated space.
-	 */
-	mutex_lock(&dm_ulog_lock);
-
-	memset(tfr, 0, DM_ULOG_PREALLOCED_SIZE - sizeof(struct cn_msg));
-	memcpy(tfr->uuid, uuid, DM_UUID_LEN);
-	tfr->version = DM_ULOG_REQUEST_VERSION;
-	tfr->luid = luid;
-	tfr->seq = dm_ulog_seq++;
-
-	/*
-	 * Must be valid request type (all other bits set to
-	 * zero).  This reserves other bits for possible future
-	 * use.
-	 */
-	tfr->request_type = request_type & DM_ULOG_REQUEST_MASK;
-
-	tfr->data_size = data_size;
-	if (data && data_size)
-		memcpy(tfr->data, data, data_size);
-
-	memset(&pkg, 0, sizeof(pkg));
-	init_completion(&pkg.complete);
-	pkg.seq = tfr->seq;
-	pkg.data_size = rdata_size;
-	pkg.data = rdata;
-	spin_lock(&receiving_list_lock);
-	list_add(&(pkg.list), &receiving_list);
-	spin_unlock(&receiving_list_lock);
-
-	r = dm_ulog_sendto_server(tfr);
-
-	mutex_unlock(&dm_ulog_lock);
-
-	if (r) {
-		DMERR("Unable to send log request [%u] to userspace: %d",
-		      request_type, r);
-		spin_lock(&receiving_list_lock);
-		list_del_init(&(pkg.list));
-		spin_unlock(&receiving_list_lock);
-
-		goto out;
-	}
-
-	r = wait_for_completion_timeout(&(pkg.complete), DM_ULOG_RETRY_TIMEOUT);
-	spin_lock(&receiving_list_lock);
-	list_del_init(&(pkg.list));
-	spin_unlock(&receiving_list_lock);
-	if (!r) {
-		DMWARN("[%s] Request timed out: [%u/%u] - retrying",
-		       (strlen(uuid) > 8) ?
-		       (uuid + (strlen(uuid) - 8)) : (uuid),
-		       request_type, pkg.seq);
-		goto resend;
-	}
-
-	r = pkg.error;
-	if (r == -EAGAIN)
-		goto resend;
-
-out:
-	return r;
-}
-
-int dm_ulog_tfr_init(void)
-{
-	int r;
-	void *prealloced;
-
-	INIT_LIST_HEAD(&receiving_list);
-
-	prealloced = kmalloc(DM_ULOG_PREALLOCED_SIZE, GFP_KERNEL);
-	if (!prealloced)
-		return -ENOMEM;
-
-	prealloced_cn_msg = prealloced;
-	prealloced_ulog_tfr = prealloced + sizeof(struct cn_msg);
-
-	r = cn_add_callback(&ulog_cn_id, "dmlogusr", cn_ulog_callback);
-	if (r) {
-		cn_del_callback(&ulog_cn_id);
-		return r;
-	}
-
-	return 0;
-}
-
-void dm_ulog_tfr_exit(void)
-{
-	cn_del_callback(&ulog_cn_id);
-	kfree(prealloced_cn_msg);
-}