qemu-file: Move QEMUFile code to qemu-file.c

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 0 insertions, 820 deletions

diff --git a/savevm.c b/savevm.c
index 3f13a6a..8eeb5ef 100644
--- a/savevm.c
+++ b/savevm.c
@@ -114,396 +114,6 @@ void qemu_announce_self(void)
 /***********************************************************/
 /* savevm/loadvm support */
 
-#define IO_BUF_SIZE 32768
-#define MAX_IOV_SIZE MIN(IOV_MAX, 64)
-
-struct QEMUFile {
-    const QEMUFileOps *ops;
-    void *opaque;
-
-    int64_t bytes_xfer;
-    int64_t xfer_limit;
-
-    int64_t pos; /* start of buffer when writing, end of buffer
-                    when reading */
-    int buf_index;
-    int buf_size; /* 0 when writing */
-    uint8_t buf[IO_BUF_SIZE];
-
-    struct iovec iov[MAX_IOV_SIZE];
-    unsigned int iovcnt;
-
-    int last_error;
-};
-
-typedef struct QEMUFileStdio {
-    FILE *stdio_file;
-    QEMUFile *file;
-} QEMUFileStdio;
-
-typedef struct QEMUFileSocket {
-    int fd;
-    QEMUFile *file;
-} QEMUFileSocket;
-
-static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
-                                    int64_t pos)
-{
-    QEMUFileSocket *s = opaque;
-    ssize_t len;
-    ssize_t size = iov_size(iov, iovcnt);
-
-    len = iov_send(s->fd, iov, iovcnt, 0, size);
-    if (len < size) {
-        len = -socket_error();
-    }
-    return len;
-}
-
-static int socket_get_fd(void *opaque)
-{
-    QEMUFileSocket *s = opaque;
-
-    return s->fd;
-}
-
-static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
-{
-    QEMUFileSocket *s = opaque;
-    ssize_t len;
-
-    for (;;) {
-        len = qemu_recv(s->fd, buf, size, 0);
-        if (len != -1) {
-            break;
-        }
-        if (socket_error() == EAGAIN) {
-            yield_until_fd_readable(s->fd);
-        } else if (socket_error() != EINTR) {
-            break;
-        }
-    }
-
-    if (len == -1) {
-        len = -socket_error();
-    }
-    return len;
-}
-
-static int socket_close(void *opaque)
-{
-    QEMUFileSocket *s = opaque;
-    closesocket(s->fd);
-    g_free(s);
-    return 0;
-}
-
-static int stdio_get_fd(void *opaque)
-{
-    QEMUFileStdio *s = opaque;
-
-    return fileno(s->stdio_file);
-}
-
-static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos,
-                            int size)
-{
-    QEMUFileStdio *s = opaque;
-    return fwrite(buf, 1, size, s->stdio_file);
-}
-
-static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
-{
-    QEMUFileStdio *s = opaque;
-    FILE *fp = s->stdio_file;
-    int bytes;
-
-    for (;;) {
-        clearerr(fp);
-        bytes = fread(buf, 1, size, fp);
-        if (bytes != 0 || !ferror(fp)) {
-            break;
-        }
-        if (errno == EAGAIN) {
-            yield_until_fd_readable(fileno(fp));
-        } else if (errno != EINTR) {
-            break;
-        }
-    }
-    return bytes;
-}
-
-static int stdio_pclose(void *opaque)
-{
-    QEMUFileStdio *s = opaque;
-    int ret;
-    ret = pclose(s->stdio_file);
-    if (ret == -1) {
-        ret = -errno;
-    } else if (!WIFEXITED(ret) || WEXITSTATUS(ret) != 0) {
-        /* close succeeded, but non-zero exit code: */
-        ret = -EIO; /* fake errno value */
-    }
-    g_free(s);
-    return ret;
-}
-
-static int stdio_fclose(void *opaque)
-{
-    QEMUFileStdio *s = opaque;
-    int ret = 0;
-
-    if (s->file->ops->put_buffer || s->file->ops->writev_buffer) {
-        int fd = fileno(s->stdio_file);
-        struct stat st;
-
-        ret = fstat(fd, &st);
-        if (ret == 0 && S_ISREG(st.st_mode)) {
-            /*
-             * If the file handle is a regular file make sure the
-             * data is flushed to disk before signaling success.
-             */
-            ret = fsync(fd);
-            if (ret != 0) {
-                ret = -errno;
-                return ret;
-            }
-        }
-    }
-    if (fclose(s->stdio_file) == EOF) {
-        ret = -errno;
-    }
-    g_free(s);
-    return ret;
-}
-
-static const QEMUFileOps stdio_pipe_read_ops = {
-    .get_fd =     stdio_get_fd,
-    .get_buffer = stdio_get_buffer,
-    .close =      stdio_pclose
-};
-
-static const QEMUFileOps stdio_pipe_write_ops = {
-    .get_fd =     stdio_get_fd,
-    .put_buffer = stdio_put_buffer,
-    .close =      stdio_pclose
-};
-
-QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
-{
-    FILE *stdio_file;
-    QEMUFileStdio *s;
-
-    if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
-        fprintf(stderr, "qemu_popen: Argument validity check failed\n");
-        return NULL;
-    }
-
-    stdio_file = popen(command, mode);
-    if (stdio_file == NULL) {
-        return NULL;
-    }
-
-    s = g_malloc0(sizeof(QEMUFileStdio));
-
-    s->stdio_file = stdio_file;
-
-    if (mode[0] == 'r') {
-        s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
-    } else {
-        s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
-    }
-    return s->file;
-}
-
-static const QEMUFileOps stdio_file_read_ops = {
-    .get_fd =     stdio_get_fd,
-    .get_buffer = stdio_get_buffer,
-    .close =      stdio_fclose
-};
-
-static const QEMUFileOps stdio_file_write_ops = {
-    .get_fd =     stdio_get_fd,
-    .put_buffer = stdio_put_buffer,
-    .close =      stdio_fclose
-};
-
-static ssize_t unix_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
-                                  int64_t pos)
-{
-    QEMUFileSocket *s = opaque;
-    ssize_t len, offset;
-    ssize_t size = iov_size(iov, iovcnt);
-    ssize_t total = 0;
-
-    assert(iovcnt > 0);
-    offset = 0;
-    while (size > 0) {
-        /* Find the next start position; skip all full-sized vector elements  */
-        while (offset >= iov[0].iov_len) {
-            offset -= iov[0].iov_len;
-            iov++, iovcnt--;
-        }
-
-        /* skip `offset' bytes from the (now) first element, undo it on exit */
-        assert(iovcnt > 0);
-        iov[0].iov_base += offset;
-        iov[0].iov_len -= offset;
-
-        do {
-            len = writev(s->fd, iov, iovcnt);
-        } while (len == -1 && errno == EINTR);
-        if (len == -1) {
-            return -errno;
-        }
-
-        /* Undo the changes above */
-        iov[0].iov_base -= offset;
-        iov[0].iov_len += offset;
-
-        /* Prepare for the next iteration */
-        offset += len;
-        total += len;
-        size -= len;
-    }
-
-    return total;
-}
-
-static int unix_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
-{
-    QEMUFileSocket *s = opaque;
-    ssize_t len;
-
-    for (;;) {
-        len = read(s->fd, buf, size);
-        if (len != -1) {
-            break;
-        }
-        if (errno == EAGAIN) {
-            yield_until_fd_readable(s->fd);
-        } else if (errno != EINTR) {
-            break;
-        }
-    }
-
-    if (len == -1) {
-        len = -errno;
-    }
-    return len;
-}
-
-static int unix_close(void *opaque)
-{
-    QEMUFileSocket *s = opaque;
-    close(s->fd);
-    g_free(s);
-    return 0;
-}
-
-static const QEMUFileOps unix_read_ops = {
-    .get_fd =     socket_get_fd,
-    .get_buffer = unix_get_buffer,
-    .close =      unix_close
-};
-
-static const QEMUFileOps unix_write_ops = {
-    .get_fd =     socket_get_fd,
-    .writev_buffer = unix_writev_buffer,
-    .close =      unix_close
-};
-
-QEMUFile *qemu_fdopen(int fd, const char *mode)
-{
-    QEMUFileSocket *s;
-
-    if (mode == NULL ||
-        (mode[0] != 'r' && mode[0] != 'w') ||
-        mode[1] != 'b' || mode[2] != 0) {
-        fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
-        return NULL;
-    }
-
-    s = g_malloc0(sizeof(QEMUFileSocket));
-    s->fd = fd;
-
-    if (mode[0] == 'r') {
-        s->file = qemu_fopen_ops(s, &unix_read_ops);
-    } else {
-        s->file = qemu_fopen_ops(s, &unix_write_ops);
-    }
-    return s->file;
-}
-
-static const QEMUFileOps socket_read_ops = {
-    .get_fd =     socket_get_fd,
-    .get_buffer = socket_get_buffer,
-    .close =      socket_close
-};
-
-static const QEMUFileOps socket_write_ops = {
-    .get_fd =     socket_get_fd,
-    .writev_buffer = socket_writev_buffer,
-    .close =      socket_close
-};
-
-bool qemu_file_mode_is_not_valid(const char *mode)
-{
-    if (mode == NULL ||
-        (mode[0] != 'r' && mode[0] != 'w') ||
-        mode[1] != 'b' || mode[2] != 0) {
-        fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
-        return true;
-    }
-
-    return false;
-}
-
-QEMUFile *qemu_fopen_socket(int fd, const char *mode)
-{
-    QEMUFileSocket *s;
-
-    if (qemu_file_mode_is_not_valid(mode)) {
-        return NULL;
-    }
-
-    s = g_malloc0(sizeof(QEMUFileSocket));
-    s->fd = fd;
-    if (mode[0] == 'w') {
-        qemu_set_block(s->fd);
-        s->file = qemu_fopen_ops(s, &socket_write_ops);
-    } else {
-        s->file = qemu_fopen_ops(s, &socket_read_ops);
-    }
-    return s->file;
-}
-
-QEMUFile *qemu_fopen(const char *filename, const char *mode)
-{
-    QEMUFileStdio *s;
-
-    if (qemu_file_mode_is_not_valid(mode)) {
-        return NULL;
-    }
-
-    s = g_malloc0(sizeof(QEMUFileStdio));
-
-    s->stdio_file = fopen(filename, mode);
-    if (!s->stdio_file) {
-        goto fail;
-    }
-
-    if (mode[0] == 'w') {
-        s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
-    } else {
-        s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
-    }
-    return s->file;
-fail:
-    g_free(s);
-    return NULL;
-}
-
 static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
                                    int64_t pos)
 {
@@ -555,436 +165,6 @@ static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
     return qemu_fopen_ops(bs, &bdrv_read_ops);
 }
 
-QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
-{
-    QEMUFile *f;
-
-    f = g_malloc0(sizeof(QEMUFile));
-
-    f->opaque = opaque;
-    f->ops = ops;
-    return f;
-}
-
-/*
- * Get last error for stream f
- *
- * Return negative error value if there has been an error on previous
- * operations, return 0 if no error happened.
- *
- */
-int qemu_file_get_error(QEMUFile *f)
-{
-    return f->last_error;
-}
-
-void qemu_file_set_error(QEMUFile *f, int ret)
-{
-    if (f->last_error == 0) {
-        f->last_error = ret;
-    }
-}
-
-static inline bool qemu_file_is_writable(QEMUFile *f)
-{
-    return f->ops->writev_buffer || f->ops->put_buffer;
-}
-
-/**
- * Flushes QEMUFile buffer
- *
- * If there is writev_buffer QEMUFileOps it uses it otherwise uses
- * put_buffer ops.
- */
-void qemu_fflush(QEMUFile *f)
-{
-    ssize_t ret = 0;
-
-    if (!qemu_file_is_writable(f)) {
-        return;
-    }
-
-    if (f->ops->writev_buffer) {
-        if (f->iovcnt > 0) {
-            ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos);
-        }
-    } else {
-        if (f->buf_index > 0) {
-            ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index);
-        }
-    }
-    if (ret >= 0) {
-        f->pos += ret;
-    }
-    f->buf_index = 0;
-    f->iovcnt = 0;
-    if (ret < 0) {
-        qemu_file_set_error(f, ret);
-    }
-}
-
-void ram_control_before_iterate(QEMUFile *f, uint64_t flags)
-{
-    int ret = 0;
-
-    if (f->ops->before_ram_iterate) {
-        ret = f->ops->before_ram_iterate(f, f->opaque, flags);
-        if (ret < 0) {
-            qemu_file_set_error(f, ret);
-        }
-    }
-}
-
-void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
-{
-    int ret = 0;
-
-    if (f->ops->after_ram_iterate) {
-        ret = f->ops->after_ram_iterate(f, f->opaque, flags);
-        if (ret < 0) {
-            qemu_file_set_error(f, ret);
-        }
-    }
-}
-
-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) {
-            qemu_file_set_error(f, ret);
-        }
-    } else {
-        qemu_file_set_error(f, ret);
-    }
-}
-
-size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
-                         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);
-
-        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);
-            }
-        }
-
-        return ret;
-    }
-
-    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;
-}
-
 
 /* timer */