Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 578 deletions

diff --git a/ANDROID_3.4.5/fs/ecryptfs/messaging.c b/ANDROID_3.4.5/fs/ecryptfs/messaging.c
deleted file mode 100644
index ab224809..00000000
--- a/ANDROID_3.4.5/fs/ecryptfs/messaging.c
+++ /dev/null
@@ -1,578 +0,0 @@
-/**
- * eCryptfs: Linux filesystem encryption layer
- *
- * Copyright (C) 2004-2008 International Business Machines Corp.
- *   Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
- *		Tyler Hicks <tyhicks@ou.edu>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version
- * 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/user_namespace.h>
-#include <linux/nsproxy.h>
-#include "ecryptfs_kernel.h"
-
-static LIST_HEAD(ecryptfs_msg_ctx_free_list);
-static LIST_HEAD(ecryptfs_msg_ctx_alloc_list);
-static struct mutex ecryptfs_msg_ctx_lists_mux;
-
-static struct hlist_head *ecryptfs_daemon_hash;
-struct mutex ecryptfs_daemon_hash_mux;
-static int ecryptfs_hash_bits;
-#define ecryptfs_uid_hash(uid) \
-        hash_long((unsigned long)uid, ecryptfs_hash_bits)
-
-static u32 ecryptfs_msg_counter;
-static struct ecryptfs_msg_ctx *ecryptfs_msg_ctx_arr;
-
-/**
- * ecryptfs_acquire_free_msg_ctx
- * @msg_ctx: The context that was acquired from the free list
- *
- * Acquires a context element from the free list and locks the mutex
- * on the context.  Sets the msg_ctx task to current.  Returns zero on
- * success; non-zero on error or upon failure to acquire a free
- * context element.  Must be called with ecryptfs_msg_ctx_lists_mux
- * held.
- */
-static int ecryptfs_acquire_free_msg_ctx(struct ecryptfs_msg_ctx **msg_ctx)
-{
-	struct list_head *p;
-	int rc;
-
-	if (list_empty(&ecryptfs_msg_ctx_free_list)) {
-		printk(KERN_WARNING "%s: The eCryptfs free "
-		       "context list is empty.  It may be helpful to "
-		       "specify the ecryptfs_message_buf_len "
-		       "parameter to be greater than the current "
-		       "value of [%d]\n", __func__, ecryptfs_message_buf_len);
-		rc = -ENOMEM;
-		goto out;
-	}
-	list_for_each(p, &ecryptfs_msg_ctx_free_list) {
-		*msg_ctx = list_entry(p, struct ecryptfs_msg_ctx, node);
-		if (mutex_trylock(&(*msg_ctx)->mux)) {
-			(*msg_ctx)->task = current;
-			rc = 0;
-			goto out;
-		}
-	}
-	rc = -ENOMEM;
-out:
-	return rc;
-}
-
-/**
- * ecryptfs_msg_ctx_free_to_alloc
- * @msg_ctx: The context to move from the free list to the alloc list
- *
- * Must be called with ecryptfs_msg_ctx_lists_mux held.
- */
-static void ecryptfs_msg_ctx_free_to_alloc(struct ecryptfs_msg_ctx *msg_ctx)
-{
-	list_move(&msg_ctx->node, &ecryptfs_msg_ctx_alloc_list);
-	msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_PENDING;
-	msg_ctx->counter = ++ecryptfs_msg_counter;
-}
-
-/**
- * ecryptfs_msg_ctx_alloc_to_free
- * @msg_ctx: The context to move from the alloc list to the free list
- *
- * Must be called with ecryptfs_msg_ctx_lists_mux held.
- */
-void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx)
-{
-	list_move(&(msg_ctx->node), &ecryptfs_msg_ctx_free_list);
-	if (msg_ctx->msg)
-		kfree(msg_ctx->msg);
-	msg_ctx->msg = NULL;
-	msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_FREE;
-}
-
-/**
- * ecryptfs_find_daemon_by_euid
- * @euid: The effective user id which maps to the desired daemon id
- * @user_ns: The namespace in which @euid applies
- * @daemon: If return value is zero, points to the desired daemon pointer
- *
- * Must be called with ecryptfs_daemon_hash_mux held.
- *
- * Search the hash list for the given user id.
- *
- * Returns zero if the user id exists in the list; non-zero otherwise.
- */
-int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
-				 struct user_namespace *user_ns)
-{
-	struct hlist_node *elem;
-	int rc;
-
-	hlist_for_each_entry(*daemon, elem,
-			     &ecryptfs_daemon_hash[ecryptfs_uid_hash(euid)],
-			     euid_chain) {
-		if ((*daemon)->euid == euid && (*daemon)->user_ns == user_ns) {
-			rc = 0;
-			goto out;
-		}
-	}
-	rc = -EINVAL;
-out:
-	return rc;
-}
-
-/**
- * ecryptfs_spawn_daemon - Create and initialize a new daemon struct
- * @daemon: Pointer to set to newly allocated daemon struct
- * @euid: Effective user id for the daemon
- * @user_ns: The namespace in which @euid applies
- * @pid: Process id for the daemon
- *
- * Must be called ceremoniously while in possession of
- * ecryptfs_sacred_daemon_hash_mux
- *
- * Returns zero on success; non-zero otherwise
- */
-int
-ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
-		      struct user_namespace *user_ns, struct pid *pid)
-{
-	int rc = 0;
-
-	(*daemon) = kzalloc(sizeof(**daemon), GFP_KERNEL);
-	if (!(*daemon)) {
-		rc = -ENOMEM;
-		printk(KERN_ERR "%s: Failed to allocate [%zd] bytes of "
-		       "GFP_KERNEL memory\n", __func__, sizeof(**daemon));
-		goto out;
-	}
-	(*daemon)->euid = euid;
-	(*daemon)->user_ns = get_user_ns(user_ns);
-	(*daemon)->pid = get_pid(pid);
-	(*daemon)->task = current;
-	mutex_init(&(*daemon)->mux);
-	INIT_LIST_HEAD(&(*daemon)->msg_ctx_out_queue);
-	init_waitqueue_head(&(*daemon)->wait);
-	(*daemon)->num_queued_msg_ctx = 0;
-	hlist_add_head(&(*daemon)->euid_chain,
-		       &ecryptfs_daemon_hash[ecryptfs_uid_hash(euid)]);
-out:
-	return rc;
-}
-
-/**
- * ecryptfs_exorcise_daemon - Destroy the daemon struct
- *
- * Must be called ceremoniously while in possession of
- * ecryptfs_daemon_hash_mux and the daemon's own mux.
- */
-int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon)
-{
-	struct ecryptfs_msg_ctx *msg_ctx, *msg_ctx_tmp;
-	int rc = 0;
-
-	mutex_lock(&daemon->mux);
-	if ((daemon->flags & ECRYPTFS_DAEMON_IN_READ)
-	    || (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)) {
-		rc = -EBUSY;
-		printk(KERN_WARNING "%s: Attempt to destroy daemon with pid "
-		       "[0x%p], but it is in the midst of a read or a poll\n",
-		       __func__, daemon->pid);
-		mutex_unlock(&daemon->mux);
-		goto out;
-	}
-	list_for_each_entry_safe(msg_ctx, msg_ctx_tmp,
-				 &daemon->msg_ctx_out_queue, daemon_out_list) {
-		list_del(&msg_ctx->daemon_out_list);
-		daemon->num_queued_msg_ctx--;
-		printk(KERN_WARNING "%s: Warning: dropping message that is in "
-		       "the out queue of a dying daemon\n", __func__);
-		ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
-	}
-	hlist_del(&daemon->euid_chain);
-	if (daemon->task)
-		wake_up_process(daemon->task);
-	if (daemon->pid)
-		put_pid(daemon->pid);
-	if (daemon->user_ns)
-		put_user_ns(daemon->user_ns);
-	mutex_unlock(&daemon->mux);
-	kzfree(daemon);
-out:
-	return rc;
-}
-
-/**
- * ecryptfs_process_quit
- * @euid: The user ID owner of the message
- * @user_ns: The namespace in which @euid applies
- * @pid: The process ID for the userspace program that sent the
- *       message
- *
- * Deletes the corresponding daemon for the given euid and pid, if
- * it is the registered that is requesting the deletion. Returns zero
- * after deleting the desired daemon; non-zero otherwise.
- */
-int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
-			  struct pid *pid)
-{
-	struct ecryptfs_daemon *daemon;
-	int rc;
-
-	mutex_lock(&ecryptfs_daemon_hash_mux);
-	rc = ecryptfs_find_daemon_by_euid(&daemon, euid, user_ns);
-	if (rc || !daemon) {
-		rc = -EINVAL;
-		printk(KERN_ERR "Received request from user [%d] to "
-		       "unregister unrecognized daemon [0x%p]\n", euid, pid);
-		goto out_unlock;
-	}
-	rc = ecryptfs_exorcise_daemon(daemon);
-out_unlock:
-	mutex_unlock(&ecryptfs_daemon_hash_mux);
-	return rc;
-}
-
-/**
- * ecryptfs_process_reponse
- * @msg: The ecryptfs message received; the caller should sanity check
- *       msg->data_len and free the memory
- * @pid: The process ID of the userspace application that sent the
- *       message
- * @seq: The sequence number of the message; must match the sequence
- *       number for the existing message context waiting for this
- *       response
- *
- * Processes a response message after sending an operation request to
- * userspace. Some other process is awaiting this response. Before
- * sending out its first communications, the other process allocated a
- * msg_ctx from the ecryptfs_msg_ctx_arr at a particular index. The
- * response message contains this index so that we can copy over the
- * response message into the msg_ctx that the process holds a
- * reference to. The other process is going to wake up, check to see
- * that msg_ctx->state == ECRYPTFS_MSG_CTX_STATE_DONE, and then
- * proceed to read off and process the response message. Returns zero
- * upon delivery to desired context element; non-zero upon delivery
- * failure or error.
- *
- * Returns zero on success; non-zero otherwise
- */
-int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
-			      struct user_namespace *user_ns, struct pid *pid,
-			      u32 seq)
-{
-	struct ecryptfs_daemon *uninitialized_var(daemon);
-	struct ecryptfs_msg_ctx *msg_ctx;
-	size_t msg_size;
-	struct nsproxy *nsproxy;
-	struct user_namespace *tsk_user_ns;
-	uid_t ctx_euid;
-	int rc;
-
-	if (msg->index >= ecryptfs_message_buf_len) {
-		rc = -EINVAL;
-		printk(KERN_ERR "%s: Attempt to reference "
-		       "context buffer at index [%d]; maximum "
-		       "allowable is [%d]\n", __func__, msg->index,
-		       (ecryptfs_message_buf_len - 1));
-		goto out;
-	}
-	msg_ctx = &ecryptfs_msg_ctx_arr[msg->index];
-	mutex_lock(&msg_ctx->mux);
-	mutex_lock(&ecryptfs_daemon_hash_mux);
-	rcu_read_lock();
-	nsproxy = task_nsproxy(msg_ctx->task);
-	if (nsproxy == NULL) {
-		rc = -EBADMSG;
-		printk(KERN_ERR "%s: Receiving process is a zombie. Dropping "
-		       "message.\n", __func__);
-		rcu_read_unlock();
-		mutex_unlock(&ecryptfs_daemon_hash_mux);
-		goto wake_up;
-	}
-	tsk_user_ns = __task_cred(msg_ctx->task)->user->user_ns;
-	ctx_euid = task_euid(msg_ctx->task);
-	rc = ecryptfs_find_daemon_by_euid(&daemon, ctx_euid, tsk_user_ns);
-	rcu_read_unlock();
-	mutex_unlock(&ecryptfs_daemon_hash_mux);
-	if (rc) {
-		rc = -EBADMSG;
-		printk(KERN_WARNING "%s: User [%d] received a "
-		       "message response from process [0x%p] but does "
-		       "not have a registered daemon\n", __func__,
-		       ctx_euid, pid);
-		goto wake_up;
-	}
-	if (ctx_euid != euid) {
-		rc = -EBADMSG;
-		printk(KERN_WARNING "%s: Received message from user "
-		       "[%d]; expected message from user [%d]\n", __func__,
-		       euid, ctx_euid);
-		goto unlock;
-	}
-	if (tsk_user_ns != user_ns) {
-		rc = -EBADMSG;
-		printk(KERN_WARNING "%s: Received message from user_ns "
-		       "[0x%p]; expected message from user_ns [0x%p]\n",
-		       __func__, user_ns, tsk_user_ns);
-		goto unlock;
-	}
-	if (daemon->pid != pid) {
-		rc = -EBADMSG;
-		printk(KERN_ERR "%s: User [%d] sent a message response "
-		       "from an unrecognized process [0x%p]\n",
-		       __func__, ctx_euid, pid);
-		goto unlock;
-	}
-	if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_PENDING) {
-		rc = -EINVAL;
-		printk(KERN_WARNING "%s: Desired context element is not "
-		       "pending a response\n", __func__);
-		goto unlock;
-	} else if (msg_ctx->counter != seq) {
-		rc = -EINVAL;
-		printk(KERN_WARNING "%s: Invalid message sequence; "
-		       "expected [%d]; received [%d]\n", __func__,
-		       msg_ctx->counter, seq);
-		goto unlock;
-	}
-	msg_size = (sizeof(*msg) + msg->data_len);
-	msg_ctx->msg = kmalloc(msg_size, GFP_KERNEL);
-	if (!msg_ctx->msg) {
-		rc = -ENOMEM;
-		printk(KERN_ERR "%s: Failed to allocate [%zd] bytes of "
-		       "GFP_KERNEL memory\n", __func__, msg_size);
-		goto unlock;
-	}
-	memcpy(msg_ctx->msg, msg, msg_size);
-	msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_DONE;
-	rc = 0;
-wake_up:
-	wake_up_process(msg_ctx->task);
-unlock:
-	mutex_unlock(&msg_ctx->mux);
-out:
-	return rc;
-}
-
-/**
- * ecryptfs_send_message_locked
- * @data: The data to send
- * @data_len: The length of data
- * @msg_ctx: The message context allocated for the send
- *
- * Must be called with ecryptfs_daemon_hash_mux held.
- *
- * Returns zero on success; non-zero otherwise
- */
-static int
-ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
-			     struct ecryptfs_msg_ctx **msg_ctx)
-{
-	struct ecryptfs_daemon *daemon;
-	uid_t euid = current_euid();
-	int rc;
-
-	rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
-	if (rc || !daemon) {
-		rc = -ENOTCONN;
-		printk(KERN_ERR "%s: User [%d] does not have a daemon "
-		       "registered\n", __func__, euid);
-		goto out;
-	}
-	mutex_lock(&ecryptfs_msg_ctx_lists_mux);
-	rc = ecryptfs_acquire_free_msg_ctx(msg_ctx);
-	if (rc) {
-		mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
-		printk(KERN_WARNING "%s: Could not claim a free "
-		       "context element\n", __func__);
-		goto out;
-	}
-	ecryptfs_msg_ctx_free_to_alloc(*msg_ctx);
-	mutex_unlock(&(*msg_ctx)->mux);
-	mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
-	rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type, 0,
-				   daemon);
-	if (rc)
-		printk(KERN_ERR "%s: Error attempting to send message to "
-		       "userspace daemon; rc = [%d]\n", __func__, rc);
-out:
-	return rc;
-}
-
-/**
- * ecryptfs_send_message
- * @data: The data to send
- * @data_len: The length of data
- * @msg_ctx: The message context allocated for the send
- *
- * Grabs ecryptfs_daemon_hash_mux.
- *
- * Returns zero on success; non-zero otherwise
- */
-int ecryptfs_send_message(char *data, int data_len,
-			  struct ecryptfs_msg_ctx **msg_ctx)
-{
-	int rc;
-
-	mutex_lock(&ecryptfs_daemon_hash_mux);
-	rc = ecryptfs_send_message_locked(data, data_len, ECRYPTFS_MSG_REQUEST,
-					  msg_ctx);
-	mutex_unlock(&ecryptfs_daemon_hash_mux);
-	return rc;
-}
-
-/**
- * ecryptfs_wait_for_response
- * @msg_ctx: The context that was assigned when sending a message
- * @msg: The incoming message from userspace; not set if rc != 0
- *
- * Sleeps until awaken by ecryptfs_receive_message or until the amount
- * of time exceeds ecryptfs_message_wait_timeout.  If zero is
- * returned, msg will point to a valid message from userspace; a
- * non-zero value is returned upon failure to receive a message or an
- * error occurs. Callee must free @msg on success.
- */
-int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
-			       struct ecryptfs_message **msg)
-{
-	signed long timeout = ecryptfs_message_wait_timeout * HZ;
-	int rc = 0;
-
-sleep:
-	timeout = schedule_timeout_interruptible(timeout);
-	mutex_lock(&ecryptfs_msg_ctx_lists_mux);
-	mutex_lock(&msg_ctx->mux);
-	if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_DONE) {
-		if (timeout) {
-			mutex_unlock(&msg_ctx->mux);
-			mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
-			goto sleep;
-		}
-		rc = -ENOMSG;
-	} else {
-		*msg = msg_ctx->msg;
-		msg_ctx->msg = NULL;
-	}
-	ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
-	mutex_unlock(&msg_ctx->mux);
-	mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
-	return rc;
-}
-
-int __init ecryptfs_init_messaging(void)
-{
-	int i;
-	int rc = 0;
-
-	if (ecryptfs_number_of_users > ECRYPTFS_MAX_NUM_USERS) {
-		ecryptfs_number_of_users = ECRYPTFS_MAX_NUM_USERS;
-		printk(KERN_WARNING "%s: Specified number of users is "
-		       "too large, defaulting to [%d] users\n", __func__,
-		       ecryptfs_number_of_users);
-	}
-	mutex_init(&ecryptfs_daemon_hash_mux);
-	mutex_lock(&ecryptfs_daemon_hash_mux);
-	ecryptfs_hash_bits = 1;
-	while (ecryptfs_number_of_users >> ecryptfs_hash_bits)
-		ecryptfs_hash_bits++;
-	ecryptfs_daemon_hash = kmalloc((sizeof(struct hlist_head)
-					* (1 << ecryptfs_hash_bits)),
-				       GFP_KERNEL);
-	if (!ecryptfs_daemon_hash) {
-		rc = -ENOMEM;
-		printk(KERN_ERR "%s: Failed to allocate memory\n", __func__);
-		mutex_unlock(&ecryptfs_daemon_hash_mux);
-		goto out;
-	}
-	for (i = 0; i < (1 << ecryptfs_hash_bits); i++)
-		INIT_HLIST_HEAD(&ecryptfs_daemon_hash[i]);
-	mutex_unlock(&ecryptfs_daemon_hash_mux);
-	ecryptfs_msg_ctx_arr = kmalloc((sizeof(struct ecryptfs_msg_ctx)
-					* ecryptfs_message_buf_len),
-				       GFP_KERNEL);
-	if (!ecryptfs_msg_ctx_arr) {
-		rc = -ENOMEM;
-		printk(KERN_ERR "%s: Failed to allocate memory\n", __func__);
-		goto out;
-	}
-	mutex_init(&ecryptfs_msg_ctx_lists_mux);
-	mutex_lock(&ecryptfs_msg_ctx_lists_mux);
-	ecryptfs_msg_counter = 0;
-	for (i = 0; i < ecryptfs_message_buf_len; i++) {
-		INIT_LIST_HEAD(&ecryptfs_msg_ctx_arr[i].node);
-		INIT_LIST_HEAD(&ecryptfs_msg_ctx_arr[i].daemon_out_list);
-		mutex_init(&ecryptfs_msg_ctx_arr[i].mux);
-		mutex_lock(&ecryptfs_msg_ctx_arr[i].mux);
-		ecryptfs_msg_ctx_arr[i].index = i;
-		ecryptfs_msg_ctx_arr[i].state = ECRYPTFS_MSG_CTX_STATE_FREE;
-		ecryptfs_msg_ctx_arr[i].counter = 0;
-		ecryptfs_msg_ctx_arr[i].task = NULL;
-		ecryptfs_msg_ctx_arr[i].msg = NULL;
-		list_add_tail(&ecryptfs_msg_ctx_arr[i].node,
-			      &ecryptfs_msg_ctx_free_list);
-		mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
-	}
-	mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
-	rc = ecryptfs_init_ecryptfs_miscdev();
-	if (rc)
-		ecryptfs_release_messaging();
-out:
-	return rc;
-}
-
-void ecryptfs_release_messaging(void)
-{
-	if (ecryptfs_msg_ctx_arr) {
-		int i;
-
-		mutex_lock(&ecryptfs_msg_ctx_lists_mux);
-		for (i = 0; i < ecryptfs_message_buf_len; i++) {
-			mutex_lock(&ecryptfs_msg_ctx_arr[i].mux);
-			if (ecryptfs_msg_ctx_arr[i].msg)
-				kfree(ecryptfs_msg_ctx_arr[i].msg);
-			mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
-		}
-		kfree(ecryptfs_msg_ctx_arr);
-		mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
-	}
-	if (ecryptfs_daemon_hash) {
-		struct hlist_node *elem;
-		struct ecryptfs_daemon *daemon;
-		int i;
-
-		mutex_lock(&ecryptfs_daemon_hash_mux);
-		for (i = 0; i < (1 << ecryptfs_hash_bits); i++) {
-			int rc;
-
-			hlist_for_each_entry(daemon, elem,
-					     &ecryptfs_daemon_hash[i],
-					     euid_chain) {
-				rc = ecryptfs_exorcise_daemon(daemon);
-				if (rc)
-					printk(KERN_ERR "%s: Error whilst "
-					       "attempting to destroy daemon; "
-					       "rc = [%d]. Dazed and confused, "
-					       "but trying to continue.\n",
-					       __func__, rc);
-			}
-		}
-		kfree(ecryptfs_daemon_hash);
-		mutex_unlock(&ecryptfs_daemon_hash_mux);
-	}
-	ecryptfs_destroy_ecryptfs_miscdev();
-	return;
-}