mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Markus Armbruster](/assets/img/avatar_default.png)
Reviewers accepted v2 of the patch, but what got committed was v1,
with the R-bys for v2. This is the v1->v2 followup fix.
[Amit:
This fixes commit aded6539d9
]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
834 lines
18 KiB
C
834 lines
18 KiB
C
#include "qemu-common.h"
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#include "qemu/iov.h"
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#include "qemu/sockets.h"
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#include "block/coroutine.h"
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#include "migration/migration.h"
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#include "migration/qemu-file.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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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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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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typedef struct QEMUFileStdio {
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FILE *stdio_file;
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QEMUFile *file;
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} QEMUFileStdio;
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typedef struct QEMUFileSocket {
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int fd;
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QEMUFile *file;
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} QEMUFileSocket;
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static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
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int64_t pos)
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{
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QEMUFileSocket *s = opaque;
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ssize_t len;
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ssize_t size = iov_size(iov, iovcnt);
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len = iov_send(s->fd, iov, iovcnt, 0, size);
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if (len < size) {
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len = -socket_error();
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}
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return len;
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}
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static int socket_get_fd(void *opaque)
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{
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QEMUFileSocket *s = opaque;
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return s->fd;
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}
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static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
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{
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QEMUFileSocket *s = opaque;
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ssize_t len;
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for (;;) {
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len = qemu_recv(s->fd, buf, size, 0);
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if (len != -1) {
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break;
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}
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if (socket_error() == EAGAIN) {
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yield_until_fd_readable(s->fd);
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} else if (socket_error() != EINTR) {
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break;
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}
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}
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if (len == -1) {
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len = -socket_error();
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}
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return len;
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}
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static int socket_close(void *opaque)
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{
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QEMUFileSocket *s = opaque;
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closesocket(s->fd);
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g_free(s);
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return 0;
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}
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static int stdio_get_fd(void *opaque)
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{
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QEMUFileStdio *s = opaque;
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return fileno(s->stdio_file);
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}
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static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos,
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int size)
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{
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QEMUFileStdio *s = opaque;
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int res;
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res = fwrite(buf, 1, size, s->stdio_file);
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if (res != size) {
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return -errno;
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}
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return res;
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}
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static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
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{
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QEMUFileStdio *s = opaque;
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FILE *fp = s->stdio_file;
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int bytes;
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for (;;) {
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clearerr(fp);
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bytes = fread(buf, 1, size, fp);
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if (bytes != 0 || !ferror(fp)) {
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break;
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}
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if (errno == EAGAIN) {
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yield_until_fd_readable(fileno(fp));
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} else if (errno != EINTR) {
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break;
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}
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}
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return bytes;
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}
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static int stdio_pclose(void *opaque)
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{
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QEMUFileStdio *s = opaque;
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int ret;
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ret = pclose(s->stdio_file);
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if (ret == -1) {
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ret = -errno;
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} else if (!WIFEXITED(ret) || WEXITSTATUS(ret) != 0) {
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/* close succeeded, but non-zero exit code: */
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ret = -EIO; /* fake errno value */
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}
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g_free(s);
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return ret;
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}
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static int stdio_fclose(void *opaque)
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{
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QEMUFileStdio *s = opaque;
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int ret = 0;
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if (s->file->ops->put_buffer || s->file->ops->writev_buffer) {
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int fd = fileno(s->stdio_file);
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struct stat st;
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ret = fstat(fd, &st);
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if (ret == 0 && S_ISREG(st.st_mode)) {
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/*
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* If the file handle is a regular file make sure the
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* data is flushed to disk before signaling success.
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*/
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ret = fsync(fd);
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if (ret != 0) {
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ret = -errno;
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return ret;
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}
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}
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}
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if (fclose(s->stdio_file) == EOF) {
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ret = -errno;
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}
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g_free(s);
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return ret;
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}
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static const QEMUFileOps stdio_pipe_read_ops = {
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.get_fd = stdio_get_fd,
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.get_buffer = stdio_get_buffer,
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.close = stdio_pclose
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};
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static const QEMUFileOps stdio_pipe_write_ops = {
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.get_fd = stdio_get_fd,
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.put_buffer = stdio_put_buffer,
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.close = stdio_pclose
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};
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QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
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{
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FILE *stdio_file;
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QEMUFileStdio *s;
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if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
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fprintf(stderr, "qemu_popen: Argument validity check failed\n");
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return NULL;
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}
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stdio_file = popen(command, mode);
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if (stdio_file == NULL) {
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return NULL;
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}
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s = g_malloc0(sizeof(QEMUFileStdio));
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s->stdio_file = stdio_file;
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if (mode[0] == 'r') {
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s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
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} else {
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s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
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}
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return s->file;
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}
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static const QEMUFileOps stdio_file_read_ops = {
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.get_fd = stdio_get_fd,
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.get_buffer = stdio_get_buffer,
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.close = stdio_fclose
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};
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static const QEMUFileOps stdio_file_write_ops = {
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.get_fd = stdio_get_fd,
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.put_buffer = stdio_put_buffer,
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.close = stdio_fclose
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};
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static ssize_t unix_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
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int64_t pos)
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{
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QEMUFileSocket *s = opaque;
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ssize_t len, offset;
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ssize_t size = iov_size(iov, iovcnt);
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ssize_t total = 0;
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assert(iovcnt > 0);
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offset = 0;
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while (size > 0) {
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/* Find the next start position; skip all full-sized vector elements */
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while (offset >= iov[0].iov_len) {
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offset -= iov[0].iov_len;
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iov++, iovcnt--;
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}
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/* skip `offset' bytes from the (now) first element, undo it on exit */
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assert(iovcnt > 0);
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iov[0].iov_base += offset;
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iov[0].iov_len -= offset;
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do {
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len = writev(s->fd, iov, iovcnt);
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} while (len == -1 && errno == EINTR);
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if (len == -1) {
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return -errno;
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}
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/* Undo the changes above */
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iov[0].iov_base -= offset;
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iov[0].iov_len += offset;
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/* Prepare for the next iteration */
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offset += len;
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total += len;
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size -= len;
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}
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return total;
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}
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static int unix_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
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{
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QEMUFileSocket *s = opaque;
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ssize_t len;
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for (;;) {
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len = read(s->fd, buf, size);
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if (len != -1) {
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break;
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}
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if (errno == EAGAIN) {
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yield_until_fd_readable(s->fd);
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} else if (errno != EINTR) {
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break;
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}
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}
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if (len == -1) {
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len = -errno;
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}
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return len;
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}
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static int unix_close(void *opaque)
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{
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QEMUFileSocket *s = opaque;
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close(s->fd);
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g_free(s);
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return 0;
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}
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static const QEMUFileOps unix_read_ops = {
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.get_fd = socket_get_fd,
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.get_buffer = unix_get_buffer,
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.close = unix_close
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};
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static const QEMUFileOps unix_write_ops = {
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.get_fd = socket_get_fd,
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.writev_buffer = unix_writev_buffer,
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.close = unix_close
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};
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QEMUFile *qemu_fdopen(int fd, const char *mode)
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{
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QEMUFileSocket *s;
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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_fdopen: Argument validity check failed\n");
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return NULL;
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}
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s = g_malloc0(sizeof(QEMUFileSocket));
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s->fd = fd;
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if (mode[0] == 'r') {
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s->file = qemu_fopen_ops(s, &unix_read_ops);
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} else {
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s->file = qemu_fopen_ops(s, &unix_write_ops);
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}
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return s->file;
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}
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static const QEMUFileOps socket_read_ops = {
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.get_fd = socket_get_fd,
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.get_buffer = socket_get_buffer,
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.close = socket_close
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};
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static const QEMUFileOps socket_write_ops = {
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.get_fd = socket_get_fd,
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.writev_buffer = socket_writev_buffer,
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.close = socket_close
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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_socket(int fd, const char *mode)
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{
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QEMUFileSocket *s;
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if (qemu_file_mode_is_not_valid(mode)) {
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return NULL;
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}
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s = g_malloc0(sizeof(QEMUFileSocket));
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s->fd = fd;
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if (mode[0] == 'w') {
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qemu_set_block(s->fd);
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s->file = qemu_fopen_ops(s, &socket_write_ops);
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} else {
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s->file = qemu_fopen_ops(s, &socket_read_ops);
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}
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return s->file;
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}
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QEMUFile *qemu_fopen(const char *filename, const char *mode)
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{
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QEMUFileStdio *s;
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if (qemu_file_mode_is_not_valid(mode)) {
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return NULL;
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}
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s = g_malloc0(sizeof(QEMUFileStdio));
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s->stdio_file = fopen(filename, mode);
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if (!s->stdio_file) {
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goto fail;
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}
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if (mode[0] == 'w') {
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s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
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} else {
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s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
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}
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return s->file;
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fail:
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g_free(s);
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return NULL;
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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_malloc0(sizeof(QEMUFile));
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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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/*
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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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static inline bool qemu_file_is_writable(QEMUFile *f)
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{
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return f->ops->writev_buffer || f->ops->put_buffer;
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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.
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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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if (!qemu_file_is_writable(f)) {
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return;
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}
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if (f->ops->writev_buffer) {
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if (f->iovcnt > 0) {
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ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos);
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}
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} else {
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if (f->buf_index > 0) {
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ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index);
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}
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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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f->buf_index = 0;
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f->iovcnt = 0;
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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_before_iterate(QEMUFile *f, uint64_t flags)
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|
{
|
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int ret = 0;
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|
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if (f->ops->before_ram_iterate) {
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ret = f->ops->before_ram_iterate(f, f->opaque, flags);
|
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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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void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
|
|
{
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|
int ret = 0;
|
|
|
|
if (f->ops->after_ram_iterate) {
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ret = f->ops->after_ram_iterate(f, f->opaque, flags);
|
|
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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (f->ops->hook_ram_load) {
|
|
ret = f->ops->hook_ram_load(f, f->opaque, flags);
|
|
if (ret < 0) {
|
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qemu_file_set_error(f, ret);
|
|
}
|
|
} else {
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qemu_file_set_error(f, ret);
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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, int *bytes_sent)
|
|
{
|
|
if (f->ops->save_page) {
|
|
int ret = f->ops->save_page(f, f->opaque, block_offset,
|
|
offset, size, bytes_sent);
|
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|
|
if (ret != RAM_SAVE_CONTROL_DELAYED) {
|
|
if (bytes_sent && *bytes_sent > 0) {
|
|
qemu_update_position(f, *bytes_sent);
|
|
} else if (ret < 0) {
|
|
qemu_file_set_error(f, ret);
|
|
}
|
|
}
|
|
|
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return ret;
|
|
}
|
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|
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return RAM_SAVE_CONTROL_NOT_SUPP;
|
|
}
|
|
|
|
static void qemu_fill_buffer(QEMUFile *f)
|
|
{
|
|
int len;
|
|
int pending;
|
|
|
|
assert(!qemu_file_is_writable(f));
|
|
|
|
pending = f->buf_size - f->buf_index;
|
|
if (pending > 0) {
|
|
memmove(f->buf, f->buf + f->buf_index, pending);
|
|
}
|
|
f->buf_index = 0;
|
|
f->buf_size = pending;
|
|
|
|
len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
|
|
IO_BUF_SIZE - pending);
|
|
if (len > 0) {
|
|
f->buf_size += len;
|
|
f->pos += len;
|
|
} else if (len == 0) {
|
|
qemu_file_set_error(f, -EIO);
|
|
} else if (len != -EAGAIN) {
|
|
qemu_file_set_error(f, len);
|
|
}
|
|
}
|
|
|
|
int qemu_get_fd(QEMUFile *f)
|
|
{
|
|
if (f->ops->get_fd) {
|
|
return f->ops->get_fd(f->opaque);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
void qemu_update_position(QEMUFile *f, size_t size)
|
|
{
|
|
f->pos += size;
|
|
}
|
|
|
|
/** Closes the file
|
|
*
|
|
* Returns negative error value if any error happened on previous operations or
|
|
* while closing the file. Returns 0 or positive number on success.
|
|
*
|
|
* The meaning of return value on success depends on the specific backend
|
|
* being used.
|
|
*/
|
|
int qemu_fclose(QEMUFile *f)
|
|
{
|
|
int ret;
|
|
qemu_fflush(f);
|
|
ret = qemu_file_get_error(f);
|
|
|
|
if (f->ops->close) {
|
|
int ret2 = f->ops->close(f->opaque);
|
|
if (ret >= 0) {
|
|
ret = ret2;
|
|
}
|
|
}
|
|
/* If any error was spotted before closing, we should report it
|
|
* instead of the close() return value.
|
|
*/
|
|
if (f->last_error) {
|
|
ret = f->last_error;
|
|
}
|
|
g_free(f);
|
|
return ret;
|
|
}
|
|
|
|
static void add_to_iovec(QEMUFile *f, const uint8_t *buf, int size)
|
|
{
|
|
/* check for adjacent buffer and coalesce them */
|
|
if (f->iovcnt > 0 && buf == f->iov[f->iovcnt - 1].iov_base +
|
|
f->iov[f->iovcnt - 1].iov_len) {
|
|
f->iov[f->iovcnt - 1].iov_len += size;
|
|
} else {
|
|
f->iov[f->iovcnt].iov_base = (uint8_t *)buf;
|
|
f->iov[f->iovcnt++].iov_len = size;
|
|
}
|
|
|
|
if (f->iovcnt >= MAX_IOV_SIZE) {
|
|
qemu_fflush(f);
|
|
}
|
|
}
|
|
|
|
void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size)
|
|
{
|
|
if (!f->ops->writev_buffer) {
|
|
qemu_put_buffer(f, buf, size);
|
|
return;
|
|
}
|
|
|
|
if (f->last_error) {
|
|
return;
|
|
}
|
|
|
|
f->bytes_xfer += size;
|
|
add_to_iovec(f, buf, size);
|
|
}
|
|
|
|
void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
|
|
{
|
|
int l;
|
|
|
|
if (f->last_error) {
|
|
return;
|
|
}
|
|
|
|
while (size > 0) {
|
|
l = IO_BUF_SIZE - f->buf_index;
|
|
if (l > size) {
|
|
l = size;
|
|
}
|
|
memcpy(f->buf + f->buf_index, buf, l);
|
|
f->bytes_xfer += l;
|
|
if (f->ops->writev_buffer) {
|
|
add_to_iovec(f, f->buf + f->buf_index, l);
|
|
}
|
|
f->buf_index += l;
|
|
if (f->buf_index == IO_BUF_SIZE) {
|
|
qemu_fflush(f);
|
|
}
|
|
if (qemu_file_get_error(f)) {
|
|
break;
|
|
}
|
|
buf += l;
|
|
size -= l;
|
|
}
|
|
}
|
|
|
|
void qemu_put_byte(QEMUFile *f, int v)
|
|
{
|
|
if (f->last_error) {
|
|
return;
|
|
}
|
|
|
|
f->buf[f->buf_index] = v;
|
|
f->bytes_xfer++;
|
|
if (f->ops->writev_buffer) {
|
|
add_to_iovec(f, f->buf + f->buf_index, 1);
|
|
}
|
|
f->buf_index++;
|
|
if (f->buf_index == IO_BUF_SIZE) {
|
|
qemu_fflush(f);
|
|
}
|
|
}
|
|
|
|
void qemu_file_skip(QEMUFile *f, int size)
|
|
{
|
|
if (f->buf_index + size <= f->buf_size) {
|
|
f->buf_index += size;
|
|
}
|
|
}
|
|
|
|
int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
|
|
{
|
|
int pending;
|
|
int index;
|
|
|
|
assert(!qemu_file_is_writable(f));
|
|
|
|
index = f->buf_index + offset;
|
|
pending = f->buf_size - index;
|
|
if (pending < size) {
|
|
qemu_fill_buffer(f);
|
|
index = f->buf_index + offset;
|
|
pending = f->buf_size - index;
|
|
}
|
|
|
|
if (pending <= 0) {
|
|
return 0;
|
|
}
|
|
if (size > pending) {
|
|
size = pending;
|
|
}
|
|
|
|
memcpy(buf, f->buf + index, size);
|
|
return size;
|
|
}
|
|
|
|
int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
|
|
{
|
|
int pending = size;
|
|
int done = 0;
|
|
|
|
while (pending > 0) {
|
|
int res;
|
|
|
|
res = qemu_peek_buffer(f, buf, pending, 0);
|
|
if (res == 0) {
|
|
return done;
|
|
}
|
|
qemu_file_skip(f, res);
|
|
buf += res;
|
|
pending -= res;
|
|
done += res;
|
|
}
|
|
return done;
|
|
}
|
|
|
|
int qemu_peek_byte(QEMUFile *f, int offset)
|
|
{
|
|
int index = f->buf_index + offset;
|
|
|
|
assert(!qemu_file_is_writable(f));
|
|
|
|
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(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 = 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;
|
|
}
|