migration: delete QEMUSizedBuffer struct
Now that we don't have have a buffer based QemuFile implementation, the QEMUSizedBuffer code is also unused and can be deleted. A simpler buffer class also exists in util/buffer.c which other code can used as needed. Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1461751518-12128-21-git-send-email-berrange@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
parent
8b7c5c0f52
commit
2a22b4f370
@ -126,13 +126,6 @@ typedef struct QEMUFileHooks {
|
||||
QEMURamSaveFunc *save_page;
|
||||
} QEMUFileHooks;
|
||||
|
||||
struct QEMUSizedBuffer {
|
||||
struct iovec *iov;
|
||||
size_t n_iov;
|
||||
size_t size; /* total allocated size in all iov's */
|
||||
size_t used; /* number of used bytes */
|
||||
};
|
||||
|
||||
QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops);
|
||||
QEMUFile *qemu_fopen(const char *filename, const char *mode);
|
||||
QEMUFile *qemu_fdopen(int fd, const char *mode);
|
||||
@ -155,15 +148,6 @@ void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, size_t size);
|
||||
bool qemu_file_mode_is_not_valid(const char *mode);
|
||||
bool qemu_file_is_writable(QEMUFile *f);
|
||||
|
||||
QEMUSizedBuffer *qsb_create(const uint8_t *buffer, size_t len);
|
||||
void qsb_free(QEMUSizedBuffer *);
|
||||
size_t qsb_set_length(QEMUSizedBuffer *qsb, size_t length);
|
||||
size_t qsb_get_length(const QEMUSizedBuffer *qsb);
|
||||
ssize_t qsb_get_buffer(const QEMUSizedBuffer *, off_t start, size_t count,
|
||||
uint8_t *buf);
|
||||
ssize_t qsb_write_at(QEMUSizedBuffer *qsb, const uint8_t *buf,
|
||||
off_t pos, size_t count);
|
||||
|
||||
|
||||
static inline void qemu_put_ubyte(QEMUFile *f, unsigned int v)
|
||||
{
|
||||
|
@ -82,7 +82,6 @@ typedef struct QemuOpt QemuOpt;
|
||||
typedef struct QemuOpts QemuOpts;
|
||||
typedef struct QemuOptsList QemuOptsList;
|
||||
typedef struct QEMUSGList QEMUSGList;
|
||||
typedef struct QEMUSizedBuffer QEMUSizedBuffer;
|
||||
typedef struct QEMUTimer QEMUTimer;
|
||||
typedef struct QEMUTimerListGroup QEMUTimerListGroup;
|
||||
typedef struct QObject QObject;
|
||||
|
@ -1,6 +1,6 @@
|
||||
common-obj-y += migration.o socket.o fd.o exec.o
|
||||
common-obj-y += vmstate.o
|
||||
common-obj-y += qemu-file.o qemu-file-buf.o qemu-file-unix.o qemu-file-stdio.o
|
||||
common-obj-y += qemu-file.o qemu-file-unix.o qemu-file-stdio.o
|
||||
common-obj-y += qemu-file-channel.o
|
||||
common-obj-y += xbzrle.o postcopy-ram.o
|
||||
common-obj-y += qjson.o
|
||||
|
@ -1,368 +0,0 @@
|
||||
/*
|
||||
* QEMU System Emulator
|
||||
*
|
||||
* Copyright (c) 2003-2008 Fabrice Bellard
|
||||
* Copyright (c) 2014 IBM Corp.
|
||||
*
|
||||
* Authors:
|
||||
* Stefan Berger <stefanb@linux.vnet.ibm.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
||||
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
#include "qemu/osdep.h"
|
||||
#include "qemu-common.h"
|
||||
#include "qemu/error-report.h"
|
||||
#include "qemu/iov.h"
|
||||
#include "qemu/sockets.h"
|
||||
#include "qemu/coroutine.h"
|
||||
#include "migration/migration.h"
|
||||
#include "migration/qemu-file.h"
|
||||
#include "migration/qemu-file-internal.h"
|
||||
#include "trace.h"
|
||||
|
||||
#define QSB_CHUNK_SIZE (1 << 10)
|
||||
#define QSB_MAX_CHUNK_SIZE (16 * QSB_CHUNK_SIZE)
|
||||
|
||||
/**
|
||||
* Create a QEMUSizedBuffer
|
||||
* This type of buffer uses scatter-gather lists internally and
|
||||
* can grow to any size. Any data array in the scatter-gather list
|
||||
* can hold different amount of bytes.
|
||||
*
|
||||
* @buffer: Optional buffer to copy into the QSB
|
||||
* @len: size of initial buffer; if @buffer is given, buffer must
|
||||
* hold at least len bytes
|
||||
*
|
||||
* Returns a pointer to a QEMUSizedBuffer or NULL on allocation failure
|
||||
*/
|
||||
QEMUSizedBuffer *qsb_create(const uint8_t *buffer, size_t len)
|
||||
{
|
||||
QEMUSizedBuffer *qsb;
|
||||
size_t alloc_len, num_chunks, i, to_copy;
|
||||
size_t chunk_size = (len > QSB_MAX_CHUNK_SIZE)
|
||||
? QSB_MAX_CHUNK_SIZE
|
||||
: QSB_CHUNK_SIZE;
|
||||
|
||||
num_chunks = DIV_ROUND_UP(len ? len : QSB_CHUNK_SIZE, chunk_size);
|
||||
alloc_len = num_chunks * chunk_size;
|
||||
|
||||
qsb = g_try_new0(QEMUSizedBuffer, 1);
|
||||
if (!qsb) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
qsb->iov = g_try_new0(struct iovec, num_chunks);
|
||||
if (!qsb->iov) {
|
||||
g_free(qsb);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
qsb->n_iov = num_chunks;
|
||||
|
||||
for (i = 0; i < num_chunks; i++) {
|
||||
qsb->iov[i].iov_base = g_try_malloc0(chunk_size);
|
||||
if (!qsb->iov[i].iov_base) {
|
||||
/* qsb_free is safe since g_free can cope with NULL */
|
||||
qsb_free(qsb);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
qsb->iov[i].iov_len = chunk_size;
|
||||
if (buffer) {
|
||||
to_copy = (len - qsb->used) > chunk_size
|
||||
? chunk_size : (len - qsb->used);
|
||||
memcpy(qsb->iov[i].iov_base, &buffer[qsb->used], to_copy);
|
||||
qsb->used += to_copy;
|
||||
}
|
||||
}
|
||||
|
||||
qsb->size = alloc_len;
|
||||
|
||||
return qsb;
|
||||
}
|
||||
|
||||
/**
|
||||
* Free the QEMUSizedBuffer
|
||||
*
|
||||
* @qsb: The QEMUSizedBuffer to free
|
||||
*/
|
||||
void qsb_free(QEMUSizedBuffer *qsb)
|
||||
{
|
||||
size_t i;
|
||||
|
||||
if (!qsb) {
|
||||
return;
|
||||
}
|
||||
|
||||
for (i = 0; i < qsb->n_iov; i++) {
|
||||
g_free(qsb->iov[i].iov_base);
|
||||
}
|
||||
g_free(qsb->iov);
|
||||
g_free(qsb);
|
||||
}
|
||||
|
||||
/**
|
||||
* Get the number of used bytes in the QEMUSizedBuffer
|
||||
*
|
||||
* @qsb: A QEMUSizedBuffer
|
||||
*
|
||||
* Returns the number of bytes currently used in this buffer
|
||||
*/
|
||||
size_t qsb_get_length(const QEMUSizedBuffer *qsb)
|
||||
{
|
||||
return qsb->used;
|
||||
}
|
||||
|
||||
/**
|
||||
* Set the length of the buffer; the primary usage of this
|
||||
* function is to truncate the number of used bytes in the buffer.
|
||||
* The size will not be extended beyond the current number of
|
||||
* allocated bytes in the QEMUSizedBuffer.
|
||||
*
|
||||
* @qsb: A QEMUSizedBuffer
|
||||
* @new_len: The new length of bytes in the buffer
|
||||
*
|
||||
* Returns the number of bytes the buffer was truncated or extended
|
||||
* to.
|
||||
*/
|
||||
size_t qsb_set_length(QEMUSizedBuffer *qsb, size_t new_len)
|
||||
{
|
||||
if (new_len <= qsb->size) {
|
||||
qsb->used = new_len;
|
||||
} else {
|
||||
qsb->used = qsb->size;
|
||||
}
|
||||
return qsb->used;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get the iovec that holds the data for a given position @pos.
|
||||
*
|
||||
* @qsb: A QEMUSizedBuffer
|
||||
* @pos: The index of a byte in the buffer
|
||||
* @d_off: Pointer to an offset that this function will indicate
|
||||
* at what position within the returned iovec the byte
|
||||
* is to be found
|
||||
*
|
||||
* Returns the index of the iovec that holds the byte at the given
|
||||
* index @pos in the byte stream; a negative number if the iovec
|
||||
* for the given position @pos does not exist.
|
||||
*/
|
||||
static ssize_t qsb_get_iovec(const QEMUSizedBuffer *qsb,
|
||||
off_t pos, off_t *d_off)
|
||||
{
|
||||
ssize_t i;
|
||||
off_t curr = 0;
|
||||
|
||||
if (pos > qsb->used) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
for (i = 0; i < qsb->n_iov; i++) {
|
||||
if (curr + qsb->iov[i].iov_len > pos) {
|
||||
*d_off = pos - curr;
|
||||
return i;
|
||||
}
|
||||
curr += qsb->iov[i].iov_len;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Convert the QEMUSizedBuffer into a flat buffer.
|
||||
*
|
||||
* Note: If at all possible, try to avoid this function since it
|
||||
* may unnecessarily copy memory around.
|
||||
*
|
||||
* @qsb: pointer to QEMUSizedBuffer
|
||||
* @start: offset to start at
|
||||
* @count: number of bytes to copy
|
||||
* @buf: a pointer to a buffer to write into (at least @count bytes)
|
||||
*
|
||||
* Returns the number of bytes copied into the output buffer
|
||||
*/
|
||||
ssize_t qsb_get_buffer(const QEMUSizedBuffer *qsb, off_t start,
|
||||
size_t count, uint8_t *buffer)
|
||||
{
|
||||
const struct iovec *iov;
|
||||
size_t to_copy, all_copy;
|
||||
ssize_t index;
|
||||
off_t s_off;
|
||||
off_t d_off = 0;
|
||||
char *s;
|
||||
|
||||
if (start > qsb->used) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
all_copy = qsb->used - start;
|
||||
if (all_copy > count) {
|
||||
all_copy = count;
|
||||
} else {
|
||||
count = all_copy;
|
||||
}
|
||||
|
||||
index = qsb_get_iovec(qsb, start, &s_off);
|
||||
if (index < 0) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
while (all_copy > 0) {
|
||||
iov = &qsb->iov[index];
|
||||
|
||||
s = iov->iov_base;
|
||||
|
||||
to_copy = iov->iov_len - s_off;
|
||||
if (to_copy > all_copy) {
|
||||
to_copy = all_copy;
|
||||
}
|
||||
memcpy(&buffer[d_off], &s[s_off], to_copy);
|
||||
|
||||
d_off += to_copy;
|
||||
all_copy -= to_copy;
|
||||
|
||||
s_off = 0;
|
||||
index++;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
/**
|
||||
* Grow the QEMUSizedBuffer to the given size and allocate
|
||||
* memory for it.
|
||||
*
|
||||
* @qsb: A QEMUSizedBuffer
|
||||
* @new_size: The new size of the buffer
|
||||
*
|
||||
* Return:
|
||||
* a negative error code in case of memory allocation failure
|
||||
* or
|
||||
* the new size of the buffer. The returned size may be greater or equal
|
||||
* to @new_size.
|
||||
*/
|
||||
static ssize_t qsb_grow(QEMUSizedBuffer *qsb, size_t new_size)
|
||||
{
|
||||
size_t needed_chunks, i;
|
||||
|
||||
if (qsb->size < new_size) {
|
||||
struct iovec *new_iov;
|
||||
size_t size_diff = new_size - qsb->size;
|
||||
size_t chunk_size = (size_diff > QSB_MAX_CHUNK_SIZE)
|
||||
? QSB_MAX_CHUNK_SIZE : QSB_CHUNK_SIZE;
|
||||
|
||||
needed_chunks = DIV_ROUND_UP(size_diff, chunk_size);
|
||||
|
||||
new_iov = g_try_new(struct iovec, qsb->n_iov + needed_chunks);
|
||||
if (new_iov == NULL) {
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/* Allocate new chunks as needed into new_iov */
|
||||
for (i = qsb->n_iov; i < qsb->n_iov + needed_chunks; i++) {
|
||||
new_iov[i].iov_base = g_try_malloc0(chunk_size);
|
||||
new_iov[i].iov_len = chunk_size;
|
||||
if (!new_iov[i].iov_base) {
|
||||
size_t j;
|
||||
|
||||
/* Free previously allocated new chunks */
|
||||
for (j = qsb->n_iov; j < i; j++) {
|
||||
g_free(new_iov[j].iov_base);
|
||||
}
|
||||
g_free(new_iov);
|
||||
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Now we can't get any allocation errors, copy over to new iov
|
||||
* and switch.
|
||||
*/
|
||||
for (i = 0; i < qsb->n_iov; i++) {
|
||||
new_iov[i] = qsb->iov[i];
|
||||
}
|
||||
|
||||
qsb->n_iov += needed_chunks;
|
||||
g_free(qsb->iov);
|
||||
qsb->iov = new_iov;
|
||||
qsb->size += (needed_chunks * chunk_size);
|
||||
}
|
||||
|
||||
return qsb->size;
|
||||
}
|
||||
|
||||
/**
|
||||
* Write into the QEMUSizedBuffer at a given position and a given
|
||||
* number of bytes. This function will automatically grow the
|
||||
* QEMUSizedBuffer.
|
||||
*
|
||||
* @qsb: A QEMUSizedBuffer
|
||||
* @source: A byte array to copy data from
|
||||
* @pos: The position within the @qsb to write data to
|
||||
* @size: The number of bytes to copy into the @qsb
|
||||
*
|
||||
* Returns @size or a negative error code in case of memory allocation failure,
|
||||
* or with an invalid 'pos'
|
||||
*/
|
||||
ssize_t qsb_write_at(QEMUSizedBuffer *qsb, const uint8_t *source,
|
||||
off_t pos, size_t count)
|
||||
{
|
||||
ssize_t rc = qsb_grow(qsb, pos + count);
|
||||
size_t to_copy;
|
||||
size_t all_copy = count;
|
||||
const struct iovec *iov;
|
||||
ssize_t index;
|
||||
char *dest;
|
||||
off_t d_off, s_off = 0;
|
||||
|
||||
if (rc < 0) {
|
||||
return rc;
|
||||
}
|
||||
|
||||
if (pos + count > qsb->used) {
|
||||
qsb->used = pos + count;
|
||||
}
|
||||
|
||||
index = qsb_get_iovec(qsb, pos, &d_off);
|
||||
if (index < 0) {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
while (all_copy > 0) {
|
||||
iov = &qsb->iov[index];
|
||||
|
||||
dest = iov->iov_base;
|
||||
|
||||
to_copy = iov->iov_len - d_off;
|
||||
if (to_copy > all_copy) {
|
||||
to_copy = all_copy;
|
||||
}
|
||||
|
||||
memcpy(&dest[d_off], &source[s_off], to_copy);
|
||||
|
||||
s_off += to_copy;
|
||||
all_copy -= to_copy;
|
||||
|
||||
d_off = 0;
|
||||
index++;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
Loading…
Reference in New Issue
Block a user