f0d64cb729
Add function opposite to qemu_get_counted_string. qemu_put_counted_string puts one-byte length of the string (string should not be longer than 255 characters), and then it puts the string, without last zero byte. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: John Snow <jsnow@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20180313180320.339796-9-vsementsov@virtuozzo.com
761 lines
19 KiB
C
761 lines
19 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include <zlib.h>
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#include "qemu-common.h"
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#include "qemu/error-report.h"
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#include "qemu/iov.h"
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#include "migration.h"
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#include "qemu-file.h"
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#include "trace.h"
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#define IO_BUF_SIZE 32768
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#define MAX_IOV_SIZE MIN(IOV_MAX, 64)
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struct QEMUFile {
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const QEMUFileOps *ops;
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const QEMUFileHooks *hooks;
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void *opaque;
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int64_t bytes_xfer;
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int64_t xfer_limit;
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int64_t pos; /* start of buffer when writing, end of buffer
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when reading */
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int buf_index;
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int buf_size; /* 0 when writing */
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uint8_t buf[IO_BUF_SIZE];
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DECLARE_BITMAP(may_free, MAX_IOV_SIZE);
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struct iovec iov[MAX_IOV_SIZE];
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unsigned int iovcnt;
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int last_error;
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};
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/*
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* Stop a file from being read/written - not all backing files can do this
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* typically only sockets can.
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*/
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int qemu_file_shutdown(QEMUFile *f)
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{
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if (!f->ops->shut_down) {
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return -ENOSYS;
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}
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return f->ops->shut_down(f->opaque, true, true);
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}
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/*
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* Result: QEMUFile* for a 'return path' for comms in the opposite direction
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* NULL if not available
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*/
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QEMUFile *qemu_file_get_return_path(QEMUFile *f)
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{
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if (!f->ops->get_return_path) {
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return NULL;
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}
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return f->ops->get_return_path(f->opaque);
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}
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bool qemu_file_mode_is_not_valid(const char *mode)
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{
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if (mode == NULL ||
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(mode[0] != 'r' && mode[0] != 'w') ||
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mode[1] != 'b' || mode[2] != 0) {
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fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
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return true;
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}
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return false;
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}
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QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
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{
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QEMUFile *f;
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f = g_new0(QEMUFile, 1);
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f->opaque = opaque;
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f->ops = ops;
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return f;
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}
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void qemu_file_set_hooks(QEMUFile *f, const QEMUFileHooks *hooks)
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{
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f->hooks = hooks;
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}
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/*
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* Get last error for stream f
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*
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* Return negative error value if there has been an error on previous
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* operations, return 0 if no error happened.
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*
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*/
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int qemu_file_get_error(QEMUFile *f)
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{
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return f->last_error;
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}
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void qemu_file_set_error(QEMUFile *f, int ret)
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{
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if (f->last_error == 0) {
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f->last_error = ret;
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}
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}
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bool qemu_file_is_writable(QEMUFile *f)
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{
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return f->ops->writev_buffer;
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}
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static void qemu_iovec_release_ram(QEMUFile *f)
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{
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struct iovec iov;
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unsigned long idx;
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/* Find and release all the contiguous memory ranges marked as may_free. */
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idx = find_next_bit(f->may_free, f->iovcnt, 0);
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if (idx >= f->iovcnt) {
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return;
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}
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iov = f->iov[idx];
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/* The madvise() in the loop is called for iov within a continuous range and
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* then reinitialize the iov. And in the end, madvise() is called for the
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* last iov.
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*/
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while ((idx = find_next_bit(f->may_free, f->iovcnt, idx + 1)) < f->iovcnt) {
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/* check for adjacent buffer and coalesce them */
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if (iov.iov_base + iov.iov_len == f->iov[idx].iov_base) {
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iov.iov_len += f->iov[idx].iov_len;
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continue;
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}
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if (qemu_madvise(iov.iov_base, iov.iov_len, QEMU_MADV_DONTNEED) < 0) {
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error_report("migrate: madvise DONTNEED failed %p %zd: %s",
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iov.iov_base, iov.iov_len, strerror(errno));
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}
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iov = f->iov[idx];
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}
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if (qemu_madvise(iov.iov_base, iov.iov_len, QEMU_MADV_DONTNEED) < 0) {
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error_report("migrate: madvise DONTNEED failed %p %zd: %s",
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iov.iov_base, iov.iov_len, strerror(errno));
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}
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memset(f->may_free, 0, sizeof(f->may_free));
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}
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/**
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* Flushes QEMUFile buffer
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*
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* If there is writev_buffer QEMUFileOps it uses it otherwise uses
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* put_buffer ops. This will flush all pending data. If data was
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* only partially flushed, it will set an error state.
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*/
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void qemu_fflush(QEMUFile *f)
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{
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ssize_t ret = 0;
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ssize_t expect = 0;
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if (!qemu_file_is_writable(f)) {
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return;
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}
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if (f->iovcnt > 0) {
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expect = iov_size(f->iov, f->iovcnt);
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ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos);
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qemu_iovec_release_ram(f);
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}
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if (ret >= 0) {
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f->pos += ret;
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}
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/* We expect the QEMUFile write impl to send the full
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* data set we requested, so sanity check that.
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*/
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if (ret != expect) {
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qemu_file_set_error(f, ret < 0 ? ret : -EIO);
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}
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f->buf_index = 0;
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f->iovcnt = 0;
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}
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void ram_control_before_iterate(QEMUFile *f, uint64_t flags)
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{
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int ret = 0;
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if (f->hooks && f->hooks->before_ram_iterate) {
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ret = f->hooks->before_ram_iterate(f, f->opaque, flags, NULL);
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if (ret < 0) {
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qemu_file_set_error(f, ret);
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}
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}
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}
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void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
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{
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int ret = 0;
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if (f->hooks && f->hooks->after_ram_iterate) {
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ret = f->hooks->after_ram_iterate(f, f->opaque, flags, NULL);
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if (ret < 0) {
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qemu_file_set_error(f, ret);
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}
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}
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}
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void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data)
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{
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int ret = -EINVAL;
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if (f->hooks && f->hooks->hook_ram_load) {
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ret = f->hooks->hook_ram_load(f, f->opaque, flags, data);
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if (ret < 0) {
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qemu_file_set_error(f, ret);
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}
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} else {
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/*
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* Hook is a hook specifically requested by the source sending a flag
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* that expects there to be a hook on the destination.
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*/
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if (flags == RAM_CONTROL_HOOK) {
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qemu_file_set_error(f, ret);
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}
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}
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}
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size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
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ram_addr_t offset, size_t size,
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uint64_t *bytes_sent)
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{
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if (f->hooks && f->hooks->save_page) {
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int ret = f->hooks->save_page(f, f->opaque, block_offset,
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offset, size, bytes_sent);
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if (ret != RAM_SAVE_CONTROL_DELAYED) {
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if (bytes_sent && *bytes_sent > 0) {
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qemu_update_position(f, *bytes_sent);
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} else if (ret < 0) {
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qemu_file_set_error(f, ret);
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}
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}
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return ret;
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}
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return RAM_SAVE_CONTROL_NOT_SUPP;
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}
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/*
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* Attempt to fill the buffer from the underlying file
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* Returns the number of bytes read, or negative value for an error.
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*
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* Note that it can return a partially full buffer even in a not error/not EOF
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* case if the underlying file descriptor gives a short read, and that can
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* happen even on a blocking fd.
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*/
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static ssize_t qemu_fill_buffer(QEMUFile *f)
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{
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int len;
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int pending;
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assert(!qemu_file_is_writable(f));
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pending = f->buf_size - f->buf_index;
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if (pending > 0) {
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memmove(f->buf, f->buf + f->buf_index, pending);
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}
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f->buf_index = 0;
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f->buf_size = pending;
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len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
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IO_BUF_SIZE - pending);
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if (len > 0) {
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f->buf_size += len;
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f->pos += len;
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} else if (len == 0) {
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qemu_file_set_error(f, -EIO);
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} else if (len != -EAGAIN) {
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qemu_file_set_error(f, len);
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}
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return len;
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}
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void qemu_update_position(QEMUFile *f, size_t size)
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{
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f->pos += size;
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}
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/** Closes the file
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*
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* Returns negative error value if any error happened on previous operations or
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* while closing the file. Returns 0 or positive number on success.
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*
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* The meaning of return value on success depends on the specific backend
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* being used.
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*/
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int qemu_fclose(QEMUFile *f)
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{
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int ret;
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qemu_fflush(f);
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ret = qemu_file_get_error(f);
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if (f->ops->close) {
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int ret2 = f->ops->close(f->opaque);
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if (ret >= 0) {
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ret = ret2;
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}
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}
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/* If any error was spotted before closing, we should report it
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* instead of the close() return value.
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*/
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if (f->last_error) {
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ret = f->last_error;
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}
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g_free(f);
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trace_qemu_file_fclose();
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return ret;
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}
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static void add_to_iovec(QEMUFile *f, const uint8_t *buf, size_t size,
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bool may_free)
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{
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/* check for adjacent buffer and coalesce them */
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if (f->iovcnt > 0 && buf == f->iov[f->iovcnt - 1].iov_base +
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f->iov[f->iovcnt - 1].iov_len &&
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may_free == test_bit(f->iovcnt - 1, f->may_free))
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{
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f->iov[f->iovcnt - 1].iov_len += size;
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} else {
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if (may_free) {
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set_bit(f->iovcnt, f->may_free);
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}
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f->iov[f->iovcnt].iov_base = (uint8_t *)buf;
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f->iov[f->iovcnt++].iov_len = size;
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}
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if (f->iovcnt >= MAX_IOV_SIZE) {
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qemu_fflush(f);
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}
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}
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void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, size_t size,
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bool may_free)
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{
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if (f->last_error) {
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return;
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}
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f->bytes_xfer += size;
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add_to_iovec(f, buf, size, may_free);
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}
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void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, size_t size)
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{
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size_t l;
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if (f->last_error) {
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return;
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}
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while (size > 0) {
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l = IO_BUF_SIZE - f->buf_index;
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if (l > size) {
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l = size;
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}
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memcpy(f->buf + f->buf_index, buf, l);
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f->bytes_xfer += l;
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add_to_iovec(f, f->buf + f->buf_index, l, false);
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f->buf_index += l;
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if (f->buf_index == IO_BUF_SIZE) {
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qemu_fflush(f);
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}
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if (qemu_file_get_error(f)) {
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break;
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}
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buf += l;
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size -= l;
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}
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}
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void qemu_put_byte(QEMUFile *f, int v)
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{
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if (f->last_error) {
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return;
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}
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f->buf[f->buf_index] = v;
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f->bytes_xfer++;
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add_to_iovec(f, f->buf + f->buf_index, 1, false);
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f->buf_index++;
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if (f->buf_index == IO_BUF_SIZE) {
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qemu_fflush(f);
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}
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}
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void qemu_file_skip(QEMUFile *f, int size)
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{
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if (f->buf_index + size <= f->buf_size) {
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f->buf_index += size;
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}
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}
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/*
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* Read 'size' bytes from file (at 'offset') without moving the
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* pointer and set 'buf' to point to that data.
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*
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* It will return size bytes unless there was an error, in which case it will
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* return as many as it managed to read (assuming blocking fd's which
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* all current QEMUFile are)
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*/
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size_t qemu_peek_buffer(QEMUFile *f, uint8_t **buf, size_t size, size_t offset)
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{
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ssize_t pending;
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size_t index;
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assert(!qemu_file_is_writable(f));
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assert(offset < IO_BUF_SIZE);
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assert(size <= IO_BUF_SIZE - offset);
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/* The 1st byte to read from */
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index = f->buf_index + offset;
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/* The number of available bytes starting at index */
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pending = f->buf_size - index;
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/*
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* qemu_fill_buffer might return just a few bytes, even when there isn't
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* an error, so loop collecting them until we get enough.
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*/
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while (pending < size) {
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int received = qemu_fill_buffer(f);
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if (received <= 0) {
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break;
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}
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index = f->buf_index + offset;
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pending = f->buf_size - index;
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}
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if (pending <= 0) {
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return 0;
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}
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if (size > pending) {
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size = pending;
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}
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*buf = f->buf + index;
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return size;
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}
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/*
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* Read 'size' bytes of data from the file into buf.
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* 'size' can be larger than the internal buffer.
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*
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* It will return size bytes unless there was an error, in which case it will
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* return as many as it managed to read (assuming blocking fd's which
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* all current QEMUFile are)
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*/
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size_t qemu_get_buffer(QEMUFile *f, uint8_t *buf, size_t size)
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{
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size_t pending = size;
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size_t done = 0;
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while (pending > 0) {
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size_t res;
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uint8_t *src;
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res = qemu_peek_buffer(f, &src, MIN(pending, IO_BUF_SIZE), 0);
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if (res == 0) {
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return done;
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}
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memcpy(buf, src, res);
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qemu_file_skip(f, res);
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buf += res;
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pending -= res;
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done += res;
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}
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return done;
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}
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/*
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* Read 'size' bytes of data from the file.
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* 'size' can be larger than the internal buffer.
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*
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* The data:
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* may be held on an internal buffer (in which case *buf is updated
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* to point to it) that is valid until the next qemu_file operation.
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* OR
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* will be copied to the *buf that was passed in.
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*
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* The code tries to avoid the copy if possible.
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*
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* It will return size bytes unless there was an error, in which case it will
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* return as many as it managed to read (assuming blocking fd's which
|
|
* all current QEMUFile are)
|
|
*
|
|
* Note: Since **buf may get changed, the caller should take care to
|
|
* keep a pointer to the original buffer if it needs to deallocate it.
|
|
*/
|
|
size_t qemu_get_buffer_in_place(QEMUFile *f, uint8_t **buf, size_t size)
|
|
{
|
|
if (size < IO_BUF_SIZE) {
|
|
size_t res;
|
|
uint8_t *src;
|
|
|
|
res = qemu_peek_buffer(f, &src, size, 0);
|
|
|
|
if (res == size) {
|
|
qemu_file_skip(f, res);
|
|
*buf = src;
|
|
return res;
|
|
}
|
|
}
|
|
|
|
return qemu_get_buffer(f, *buf, size);
|
|
}
|
|
|
|
/*
|
|
* Peeks a single byte from the buffer; this isn't guaranteed to work if
|
|
* offset leaves a gap after the previous read/peeked data.
|
|
*/
|
|
int qemu_peek_byte(QEMUFile *f, int offset)
|
|
{
|
|
int index = f->buf_index + offset;
|
|
|
|
assert(!qemu_file_is_writable(f));
|
|
assert(offset < IO_BUF_SIZE);
|
|
|
|
if (index >= f->buf_size) {
|
|
qemu_fill_buffer(f);
|
|
index = f->buf_index + offset;
|
|
if (index >= f->buf_size) {
|
|
return 0;
|
|
}
|
|
}
|
|
return f->buf[index];
|
|
}
|
|
|
|
int qemu_get_byte(QEMUFile *f)
|
|
{
|
|
int result;
|
|
|
|
result = qemu_peek_byte(f, 0);
|
|
qemu_file_skip(f, 1);
|
|
return result;
|
|
}
|
|
|
|
int64_t qemu_ftell_fast(QEMUFile *f)
|
|
{
|
|
int64_t ret = f->pos;
|
|
int i;
|
|
|
|
for (i = 0; i < f->iovcnt; i++) {
|
|
ret += f->iov[i].iov_len;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int64_t qemu_ftell(QEMUFile *f)
|
|
{
|
|
qemu_fflush(f);
|
|
return f->pos;
|
|
}
|
|
|
|
int qemu_file_rate_limit(QEMUFile *f)
|
|
{
|
|
if (qemu_file_get_error(f)) {
|
|
return 1;
|
|
}
|
|
if (f->xfer_limit > 0 && f->bytes_xfer > f->xfer_limit) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int64_t qemu_file_get_rate_limit(QEMUFile *f)
|
|
{
|
|
return f->xfer_limit;
|
|
}
|
|
|
|
void qemu_file_set_rate_limit(QEMUFile *f, int64_t limit)
|
|
{
|
|
f->xfer_limit = limit;
|
|
}
|
|
|
|
void qemu_file_reset_rate_limit(QEMUFile *f)
|
|
{
|
|
f->bytes_xfer = 0;
|
|
}
|
|
|
|
void qemu_put_be16(QEMUFile *f, unsigned int v)
|
|
{
|
|
qemu_put_byte(f, v >> 8);
|
|
qemu_put_byte(f, v);
|
|
}
|
|
|
|
void qemu_put_be32(QEMUFile *f, unsigned int v)
|
|
{
|
|
qemu_put_byte(f, v >> 24);
|
|
qemu_put_byte(f, v >> 16);
|
|
qemu_put_byte(f, v >> 8);
|
|
qemu_put_byte(f, v);
|
|
}
|
|
|
|
void qemu_put_be64(QEMUFile *f, uint64_t v)
|
|
{
|
|
qemu_put_be32(f, v >> 32);
|
|
qemu_put_be32(f, v);
|
|
}
|
|
|
|
unsigned int qemu_get_be16(QEMUFile *f)
|
|
{
|
|
unsigned int v;
|
|
v = qemu_get_byte(f) << 8;
|
|
v |= qemu_get_byte(f);
|
|
return v;
|
|
}
|
|
|
|
unsigned int qemu_get_be32(QEMUFile *f)
|
|
{
|
|
unsigned int v;
|
|
v = (unsigned int)qemu_get_byte(f) << 24;
|
|
v |= qemu_get_byte(f) << 16;
|
|
v |= qemu_get_byte(f) << 8;
|
|
v |= qemu_get_byte(f);
|
|
return v;
|
|
}
|
|
|
|
uint64_t qemu_get_be64(QEMUFile *f)
|
|
{
|
|
uint64_t v;
|
|
v = (uint64_t)qemu_get_be32(f) << 32;
|
|
v |= qemu_get_be32(f);
|
|
return v;
|
|
}
|
|
|
|
/* Compress size bytes of data start at p with specific compression
|
|
* level and store the compressed data to the buffer of f.
|
|
*
|
|
* When f is not writable, return -1 if f has no space to save the
|
|
* compressed data.
|
|
* When f is wirtable and it has no space to save the compressed data,
|
|
* do fflush first, if f still has no space to save the compressed
|
|
* data, return -1.
|
|
*/
|
|
|
|
ssize_t qemu_put_compression_data(QEMUFile *f, const uint8_t *p, size_t size,
|
|
int level)
|
|
{
|
|
ssize_t blen = IO_BUF_SIZE - f->buf_index - sizeof(int32_t);
|
|
|
|
if (blen < compressBound(size)) {
|
|
if (!qemu_file_is_writable(f)) {
|
|
return -1;
|
|
}
|
|
qemu_fflush(f);
|
|
blen = IO_BUF_SIZE - sizeof(int32_t);
|
|
if (blen < compressBound(size)) {
|
|
return -1;
|
|
}
|
|
}
|
|
if (compress2(f->buf + f->buf_index + sizeof(int32_t), (uLongf *)&blen,
|
|
(Bytef *)p, size, level) != Z_OK) {
|
|
error_report("Compress Failed!");
|
|
return 0;
|
|
}
|
|
qemu_put_be32(f, blen);
|
|
if (f->ops->writev_buffer) {
|
|
add_to_iovec(f, f->buf + f->buf_index, blen, false);
|
|
}
|
|
f->buf_index += blen;
|
|
if (f->buf_index == IO_BUF_SIZE) {
|
|
qemu_fflush(f);
|
|
}
|
|
return blen + sizeof(int32_t);
|
|
}
|
|
|
|
/* Put the data in the buffer of f_src to the buffer of f_des, and
|
|
* then reset the buf_index of f_src to 0.
|
|
*/
|
|
|
|
int qemu_put_qemu_file(QEMUFile *f_des, QEMUFile *f_src)
|
|
{
|
|
int len = 0;
|
|
|
|
if (f_src->buf_index > 0) {
|
|
len = f_src->buf_index;
|
|
qemu_put_buffer(f_des, f_src->buf, f_src->buf_index);
|
|
f_src->buf_index = 0;
|
|
f_src->iovcnt = 0;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Get a string whose length is determined by a single preceding byte
|
|
* A preallocated 256 byte buffer must be passed in.
|
|
* Returns: len on success and a 0 terminated string in the buffer
|
|
* else 0
|
|
* (Note a 0 length string will return 0 either way)
|
|
*/
|
|
size_t qemu_get_counted_string(QEMUFile *f, char buf[256])
|
|
{
|
|
size_t len = qemu_get_byte(f);
|
|
size_t res = qemu_get_buffer(f, (uint8_t *)buf, len);
|
|
|
|
buf[res] = 0;
|
|
|
|
return res == len ? res : 0;
|
|
}
|
|
|
|
/*
|
|
* Put a string with one preceding byte containing its length. The length of
|
|
* the string should be less than 256.
|
|
*/
|
|
void qemu_put_counted_string(QEMUFile *f, const char *str)
|
|
{
|
|
size_t len = strlen(str);
|
|
|
|
assert(len < 256);
|
|
qemu_put_byte(f, len);
|
|
qemu_put_buffer(f, (const uint8_t *)str, len);
|
|
}
|
|
|
|
/*
|
|
* Set the blocking state of the QEMUFile.
|
|
* Note: On some transports the OS only keeps a single blocking state for
|
|
* both directions, and thus changing the blocking on the main
|
|
* QEMUFile can also affect the return path.
|
|
*/
|
|
void qemu_file_set_blocking(QEMUFile *f, bool block)
|
|
{
|
|
if (f->ops->set_blocking) {
|
|
f->ops->set_blocking(f->opaque, block);
|
|
}
|
|
}
|