gecko/netwerk/cache/nsDeleteDir.cpp
2011-10-17 10:59:28 -04:00

145 lines
4.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Google Inc.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
* Jason Duell <jduell.mcbugs@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsDeleteDir.h"
#include "nsIFile.h"
#include "nsString.h"
#include "prthread.h"
#include "mozilla/Telemetry.h"
#include "nsITimer.h"
using namespace mozilla;
static void DeleteDirThreadFunc(void *arg)
{
Telemetry::AutoTimer<Telemetry::NETWORK_DISK_CACHE_DELETEDIR> timer;
nsIFile *dir = static_cast<nsIFile *>(arg);
dir->Remove(true);
NS_RELEASE(dir);
}
static void CreateDeleterThread(nsITimer *aTimer, void *arg)
{
nsIFile *dir = static_cast<nsIFile *>(arg);
// create the worker thread
PR_CreateThread(PR_USER_THREAD, DeleteDirThreadFunc, dir, PR_PRIORITY_LOW,
PR_GLOBAL_THREAD, PR_UNJOINABLE_THREAD, 0);
}
nsresult DeleteDir(nsIFile *dirIn, bool moveToTrash, bool sync,
PRUint32 delay)
{
Telemetry::AutoTimer<Telemetry::NETWORK_DISK_CACHE_TRASHRENAME> timer;
nsresult rv;
nsCOMPtr<nsIFile> trash, dir;
// Need to make a clone of this since we don't want to modify the input
// file object.
rv = dirIn->Clone(getter_AddRefs(dir));
if (NS_FAILED(rv))
return rv;
if (moveToTrash) {
rv = GetTrashDir(dir, &trash);
if (NS_FAILED(rv))
return rv;
nsCAutoString leaf;
rv = trash->GetNativeLeafName(leaf);
if (NS_FAILED(rv))
return rv;
// Important: must rename directory w/o changing parent directory: else on
// NTFS we'll wait (with cache lock) while nsIFile's ACL reset walks file
// tree: was hanging GUI for *minutes* on large cache dirs.
rv = dir->MoveToNative(nsnull, leaf);
if (NS_FAILED(rv)) {
nsresult rvMove = rv;
// TrashDir may already exist (if we crashed while deleting it, etc.)
// In that case current Cache dir should be small--just move it to
// subdirectory of TrashDir and eat the NTFS ACL overhead.
leaf.AppendInt(rand()); // support this happening multiple times
rv = dir->MoveToNative(trash, leaf);
if (NS_FAILED(rv))
return rvMove;
// Be paranoid and delete immediately if we're seeing old trash when
// we're creating a new one
delay = 0;
}
} else {
// we want to pass a clone of the original off to the worker thread.
trash.swap(dir);
}
// Steal ownership of trash directory; let the thread release it.
nsIFile *trashRef = nsnull;
trash.swap(trashRef);
if (sync) {
DeleteDirThreadFunc(trashRef);
} else {
if (delay) {
nsCOMPtr<nsITimer> timer = do_CreateInstance("@mozilla.org/timer;1", &rv);
if (NS_FAILED(rv))
return NS_ERROR_UNEXPECTED;
timer->InitWithFuncCallback(CreateDeleterThread, trashRef, delay,
nsITimer::TYPE_ONE_SHOT);
} else {
CreateDeleterThread(nsnull, trashRef);
}
}
return NS_OK;
}
nsresult GetTrashDir(nsIFile *target, nsCOMPtr<nsIFile> *result)
{
nsresult rv = target->Clone(getter_AddRefs(*result));
if (NS_FAILED(rv))
return rv;
nsCAutoString leaf;
rv = (*result)->GetNativeLeafName(leaf);
if (NS_FAILED(rv))
return rv;
leaf.AppendLiteral(".Trash");
return (*result)->SetNativeLeafName(leaf);
}