#include "trace.h"
#include "qemu/bitops.h"
#include "qemu/iov.h"
+#include "block/snapshot.h"
+#include "block/qapi.h"
#define SELF_ANNOUNCE_ROUNDS 5
struct QEMUFile {
const QEMUFileOps *ops;
void *opaque;
- int is_write;
int64_t bytes_xfer;
int64_t xfer_limit;
QEMUFile *file;
} QEMUFileSocket;
-typedef struct {
- Coroutine *co;
- int fd;
-} FDYieldUntilData;
-
-static void fd_coroutine_enter(void *opaque)
-{
- FDYieldUntilData *data = opaque;
- qemu_set_fd_handler(data->fd, NULL, NULL, NULL);
- qemu_coroutine_enter(data->co, NULL);
-}
-
-/**
- * Yield until a file descriptor becomes readable
- *
- * Note that this function clobbers the handlers for the file descriptor.
- */
-static void coroutine_fn yield_until_fd_readable(int fd)
-{
- FDYieldUntilData data;
-
- assert(qemu_in_coroutine());
- data.co = qemu_coroutine_self();
- data.fd = fd;
- qemu_set_fd_handler(fd, fd_coroutine_enter, NULL, &data);
- qemu_coroutine_yield();
-}
-
-static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt)
+static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
+ int64_t pos)
{
QEMUFileSocket *s = opaque;
ssize_t len;
return len;
}
-static int socket_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
-{
- QEMUFileSocket *s = opaque;
- ssize_t len;
-
- len = qemu_send_full(s->fd, buf, size, 0);
- if (len < size) {
- len = -socket_error();
- }
- return len;
-}
-
static int socket_close(void *opaque)
{
QEMUFileSocket *s = opaque;
FILE *stdio_file;
QEMUFileStdio *s;
- stdio_file = popen(command, mode);
- if (stdio_file == NULL) {
+ if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
+ fprintf(stderr, "qemu_popen: Argument validity check failed\n");
return NULL;
}
- if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
- fprintf(stderr, "qemu_popen: Argument validity check failed\n");
+ stdio_file = popen(command, mode);
+ if (stdio_file == NULL) {
return NULL;
}
.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)
{
- QEMUFileStdio *s;
+ QEMUFileSocket *s;
if (mode == NULL ||
(mode[0] != 'r' && mode[0] != 'w') ||
return NULL;
}
- s = g_malloc0(sizeof(QEMUFileStdio));
- s->stdio_file = fdopen(fd, mode);
- if (!s->stdio_file)
- goto fail;
+ s = g_malloc0(sizeof(QEMUFileSocket));
+ s->fd = fd;
if(mode[0] == 'r') {
- s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
+ s->file = qemu_fopen_ops(s, &unix_read_ops);
} else {
- s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
+ s->file = qemu_fopen_ops(s, &unix_write_ops);
}
return s->file;
-
-fail:
- g_free(s);
- return NULL;
}
static const QEMUFileOps socket_read_ops = {
static const QEMUFileOps socket_write_ops = {
.get_fd = socket_get_fd,
- .put_buffer = socket_put_buffer,
.writev_buffer = socket_writev_buffer,
.close = socket_close
};
-QEMUFile *qemu_fopen_socket(int fd, const char *mode)
+bool qemu_file_mode_is_not_valid(const char *mode)
{
- QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
-
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') {
- socket_set_block(s->fd);
+ qemu_set_block(s->fd);
s->file = qemu_fopen_ops(s, &socket_write_ops);
} else {
s->file = qemu_fopen_ops(s, &socket_read_ops);
{
QEMUFileStdio *s;
- if (mode == NULL ||
- (mode[0] != 'r' && mode[0] != 'w') ||
- mode[1] != 'b' || mode[2] != 0) {
- fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
+ if (qemu_file_mode_is_not_valid(mode)) {
return NULL;
}
return NULL;
}
+static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
+ int64_t pos)
+{
+ int ret;
+ QEMUIOVector qiov;
+
+ qemu_iovec_init_external(&qiov, iov, iovcnt);
+ ret = bdrv_writev_vmstate(opaque, &qiov, pos);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return qiov.size;
+}
+
static int block_put_buffer(void *opaque, const uint8_t *buf,
int64_t pos, int size)
{
};
static const QEMUFileOps bdrv_write_ops = {
- .put_buffer = block_put_buffer,
- .close = bdrv_fclose
+ .put_buffer = block_put_buffer,
+ .writev_buffer = block_writev_buffer,
+ .close = bdrv_fclose
};
static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
f->opaque = opaque;
f->ops = ops;
- f->is_write = 0;
return f;
}
}
}
+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.
*/
-static void qemu_fflush(QEMUFile *f)
+void qemu_fflush(QEMUFile *f)
{
ssize_t ret = 0;
- int i = 0;
- if (!f->ops->writev_buffer && !f->ops->put_buffer) {
+ if (!qemu_file_is_writable(f)) {
return;
}
- if (f->is_write && f->iovcnt > 0) {
- if (f->ops->writev_buffer) {
- ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt);
- if (ret >= 0) {
- f->pos += ret;
- }
- } else {
- for (i = 0; i < f->iovcnt && ret >= 0; i++) {
- ret = f->ops->put_buffer(f->opaque, f->iov[i].iov_base, f->pos,
- f->iov[i].iov_len);
- if (ret >= 0) {
- f->pos += ret;
- }
- }
+ if (f->ops->writev_buffer) {
+ if (f->iovcnt > 0) {
+ ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos);
}
- f->buf_index = 0;
- f->iovcnt = 0;
+ } 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 = 0;
+
+ 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;
- if (!f->ops->get_buffer)
- return;
-
- if (f->is_write)
- abort();
+ assert(!qemu_file_is_writable(f));
pending = f->buf_size - f->buf_index;
if (pending > 0) {
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
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->last_error) {
+ if (!f->ops->writev_buffer) {
+ qemu_put_buffer(f, buf, size);
return;
}
- if (f->is_write == 0 && f->buf_index > 0) {
- fprintf(stderr,
- "Attempted to write to buffer while read buffer is not empty\n");
- abort();
+ if (f->last_error) {
+ return;
}
- add_to_iovec(f, buf, size);
-
- f->is_write = 1;
f->bytes_xfer += size;
-
- if (f->buf_index >= IO_BUF_SIZE || f->iovcnt >= MAX_IOV_SIZE) {
- qemu_fflush(f);
- }
+ add_to_iovec(f, buf, size);
}
void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
return;
}
- if (f->is_write == 0 && f->buf_index > 0) {
- fprintf(stderr,
- "Attempted to write to buffer while read buffer is not empty\n");
- abort();
- }
-
while (size > 0) {
l = IO_BUF_SIZE - f->buf_index;
if (l > size)
l = size;
memcpy(f->buf + f->buf_index, buf, l);
- f->is_write = 1;
+ f->bytes_xfer += size;
+ if (f->ops->writev_buffer) {
+ add_to_iovec(f, f->buf + f->buf_index, l);
+ }
f->buf_index += l;
- qemu_put_buffer_async(f, f->buf + (f->buf_index - l), l);
+ if (f->buf_index == IO_BUF_SIZE) {
+ qemu_fflush(f);
+ }
if (qemu_file_get_error(f)) {
break;
}
return;
}
- if (f->is_write == 0 && f->buf_index > 0) {
- fprintf(stderr,
- "Attempted to write to buffer while read buffer is not empty\n");
- abort();
- }
-
- f->buf[f->buf_index++] = v;
- f->is_write = 1;
+ f->buf[f->buf_index] = v;
f->bytes_xfer++;
-
- add_to_iovec(f, f->buf + (f->buf_index - 1), 1);
-
- if (f->buf_index >= IO_BUF_SIZE || f->iovcnt >= MAX_IOV_SIZE) {
+ 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);
}
}
int pending;
int index;
- if (f->is_write) {
- abort();
- }
+ assert(!qemu_file_is_writable(f));
index = f->buf_index + offset;
pending = f->buf_size - index;
{
int index = f->buf_index + offset;
- if (f->is_write) {
- abort();
- }
+ assert(!qemu_file_is_writable(f));
if (index >= f->buf_size) {
qemu_fill_buffer(f);
return ret;
}
-static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
- const char *name)
+static BlockDriverState *find_vmstate_bs(void)
{
- QEMUSnapshotInfo *sn_tab, *sn;
- int nb_sns, i, ret;
-
- ret = -ENOENT;
- nb_sns = bdrv_snapshot_list(bs, &sn_tab);
- if (nb_sns < 0)
- return ret;
- for(i = 0; i < nb_sns; i++) {
- sn = &sn_tab[i];
- if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
- *sn_info = *sn;
- ret = 0;
- break;
+ BlockDriverState *bs = NULL;
+ while ((bs = bdrv_next(bs))) {
+ if (bdrv_can_snapshot(bs)) {
+ return bs;
}
}
- g_free(sn_tab);
- return ret;
+ return NULL;
}
/*
}
}
- bs = bdrv_snapshots();
+ bs = find_vmstate_bs();
if (!bs) {
monitor_printf(mon, "No block device can accept snapshots\n");
return;
f = qemu_fopen(filename, "wb");
if (!f) {
- error_set(errp, QERR_OPEN_FILE_FAILED, filename);
+ error_setg_file_open(errp, errno, filename);
goto the_end;
}
ret = qemu_save_device_state(f);
QEMUFile *f;
int ret;
- bs_vm_state = bdrv_snapshots();
+ bs_vm_state = find_vmstate_bs();
if (!bs_vm_state) {
error_report("No block device supports snapshots");
return -ENOTSUP;
int ret;
const char *name = qdict_get_str(qdict, "name");
- bs = bdrv_snapshots();
+ bs = find_vmstate_bs();
if (!bs) {
monitor_printf(mon, "No block device supports snapshots\n");
return;
int nb_sns, i, ret, available;
int total;
int *available_snapshots;
- char buf[256];
- bs = bdrv_snapshots();
+ bs = find_vmstate_bs();
if (!bs) {
monitor_printf(mon, "No available block device supports snapshots\n");
return;
}
if (total > 0) {
- monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
+ bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);
+ monitor_printf(mon, "\n");
for (i = 0; i < total; i++) {
sn = &sn_tab[available_snapshots[i]];
- monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
+ bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn);
+ monitor_printf(mon, "\n");
}
} else {
monitor_printf(mon, "There is no suitable snapshot available\n");
projects / qemu.git / blobdiff