/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ext4_utils/wipe.h"
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#include "ext4_utils/ext4_utils.h"
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#include <android-base/file.h>
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#if WIPE_IS_SUPPORTED
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#if defined(__linux__)
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#include <linux/fs.h>
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#include <sys/ioctl.h>
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#ifndef BLKDISCARD
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#define BLKDISCARD _IO(0x12,119)
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#endif
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#ifndef BLKSECDISCARD
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#define BLKSECDISCARD _IO(0x12,125)
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#endif
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int wipe_block_device(int fd, s64 len)
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{
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u64 range[2];
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int ret;
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if (!is_block_device_fd(fd)) {
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// Wiping only makes sense on a block device.
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return 0;
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}
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range[0] = 0;
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range[1] = len;
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ret = ioctl(fd, BLKSECDISCARD, &range);
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if (ret < 0) {
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range[0] = 0;
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range[1] = len;
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ret = ioctl(fd, BLKDISCARD, &range);
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if (ret < 0) {
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warn("Discard failed\n");
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return 1;
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} else {
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char buf[4096] = {0};
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if (!android::base::WriteFully(fd, buf, 4096)) {
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warn("Writing zeros failed\n");
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return 1;
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}
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fsync(fd);
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warn("Wipe via secure discard failed, used discard instead\n");
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return 0;
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}
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}
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return 0;
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}
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#else /* __linux__ */
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#error "Missing block device wiping implementation for this platform!"
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#endif
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#else /* WIPE_IS_SUPPORTED */
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int wipe_block_device(int fd __attribute__((unused)), s64 len __attribute__((unused)))
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{
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/* Wiping is not supported on this platform. */
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return 1;
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}
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#endif /* WIPE_IS_SUPPORTED */
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