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/******************************************************
Copyright (c) 2012 Percona LLC and/or its affiliates.
tmpfile datasink for XtraBackup.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*******************************************************/
/* Do all writes to temporary files first, then pipe them to the specified
datasink in a serialized way in deinit(). */
#include <my_global.h>
#include <my_base.h>
#include "common.h"
#include "datasink.h"
typedef struct {
pthread_mutex_t mutex;
LIST *file_list;
} ds_tmpfile_ctxt_t;
typedef struct {
LIST list;
File fd;
char *orig_path;
MY_STAT mystat;
ds_file_t *file;
} ds_tmp_file_t;
static ds_ctxt_t *tmpfile_init(const char *root);
static ds_file_t *tmpfile_open(ds_ctxt_t *ctxt, const char *path,
MY_STAT *mystat);
static int tmpfile_write(ds_file_t *file, const uchar *buf, size_t len);
static int tmpfile_close(ds_file_t *file);
static void tmpfile_deinit(ds_ctxt_t *ctxt);
datasink_t datasink_tmpfile = {
&tmpfile_init,
&tmpfile_open,
&tmpfile_write,
&tmpfile_close,
&tmpfile_deinit
};
static ds_ctxt_t *
tmpfile_init(const char *root)
{
ds_ctxt_t *ctxt;
ds_tmpfile_ctxt_t *tmpfile_ctxt;
ctxt = (ds_ctxt_t *)my_malloc(sizeof(ds_ctxt_t) + sizeof(ds_tmpfile_ctxt_t),
MYF(MY_FAE));
tmpfile_ctxt = (ds_tmpfile_ctxt_t *) (ctxt + 1);
tmpfile_ctxt->file_list = NULL;
if (pthread_mutex_init(&tmpfile_ctxt->mutex, NULL)) {
my_free(ctxt);
return NULL;
}
ctxt->ptr = tmpfile_ctxt;
ctxt->root = my_strdup(root, MYF(MY_FAE));
return ctxt;
}
static ds_file_t *
tmpfile_open(ds_ctxt_t *ctxt, const char *path,
MY_STAT *mystat)
{
ds_tmpfile_ctxt_t *tmpfile_ctxt;
char tmp_path[FN_REFLEN];
ds_tmp_file_t *tmp_file;
ds_file_t *file;
size_t path_len;
File fd;
/* Create a temporary file in tmpdir. The file will be automatically
removed on close. Code copied from mysql_tmpfile(). */
fd = create_temp_file(tmp_path,xtrabackup_tmpdir,
"xbtemp", O_BINARY | O_SEQUENTIAL,
MYF(MY_WME | MY_TEMPORARY));
if (fd < 0) {
return NULL;
}
path_len = strlen(path) + 1; /* terminating '\0' */
file = (ds_file_t *) my_malloc(sizeof(ds_file_t) +
sizeof(ds_tmp_file_t) + path_len,
MYF(MY_FAE));
tmp_file = (ds_tmp_file_t *) (file + 1);
tmp_file->file = file;
memcpy(&tmp_file->mystat, mystat, sizeof(MY_STAT));
/* Save a copy of 'path', since it may not be accessible later */
tmp_file->orig_path = (char *) tmp_file + sizeof(ds_tmp_file_t);
tmp_file->fd = fd;
memcpy(tmp_file->orig_path, path, path_len);
/* Store the real temporary file name in file->path */
file->path = my_strdup(tmp_path, MYF(MY_FAE));
file->ptr = tmp_file;
/* Store the file object in the list to be piped later */
tmpfile_ctxt = (ds_tmpfile_ctxt_t *) ctxt->ptr;
tmp_file->list.data = tmp_file;
pthread_mutex_lock(&tmpfile_ctxt->mutex);
tmpfile_ctxt->file_list = list_add(tmpfile_ctxt->file_list,
&tmp_file->list);
pthread_mutex_unlock(&tmpfile_ctxt->mutex);
return file;
}
static int
tmpfile_write(ds_file_t *file, const uchar *buf, size_t len)
{
File fd = ((ds_tmp_file_t *) file->ptr)->fd;
if (!my_write(fd, buf, len, MYF(MY_WME | MY_NABP))) {
posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED);
return 0;
}
return 1;
}
static int
tmpfile_close(ds_file_t *file)
{
/* Do nothing -- we will close (and thus remove) the file after piping
it to the destination datasink in tmpfile_deinit(). */
my_free(file->path);
return 0;
}
static void
tmpfile_deinit(ds_ctxt_t *ctxt)
{
LIST *list;
ds_tmpfile_ctxt_t *tmpfile_ctxt;
MY_STAT mystat;
ds_tmp_file_t *tmp_file;
ds_file_t *dst_file;
ds_ctxt_t *pipe_ctxt;
void *buf = NULL;
const size_t buf_size = 10 * 1024 * 1024;
size_t bytes;
size_t offset;
pipe_ctxt = ctxt->pipe_ctxt;
xb_a(pipe_ctxt != NULL);
buf = my_malloc(buf_size, MYF(MY_FAE));
tmpfile_ctxt = (ds_tmpfile_ctxt_t *) ctxt->ptr;
list = tmpfile_ctxt->file_list;
/* Walk the files in the order they have been added */
list = list_reverse(list);
while (list != NULL) {
tmp_file = (ds_tmp_file_t *)list->data;
/* Stat the file to replace size and mtime on the original
* mystat struct */
if (my_fstat(tmp_file->fd, &mystat, MYF(0))) {
die("my_fstat() failed.");
}
tmp_file->mystat.st_size = mystat.st_size;
tmp_file->mystat.st_mtime = mystat.st_mtime;
dst_file = ds_open(pipe_ctxt, tmp_file->orig_path,
&tmp_file->mystat);
if (dst_file == NULL) {
die("could not stream a temporary file to "
"'%s'", tmp_file->orig_path);
}
/* copy to the destination datasink */
posix_fadvise(tmp_file->fd, 0, 0, POSIX_FADV_SEQUENTIAL);
if (my_seek(tmp_file->fd, 0, SEEK_SET, MYF(0)) ==
MY_FILEPOS_ERROR) {
die("my_seek() failed for '%s', errno = %d.",
tmp_file->file->path, my_errno);
}
offset = 0;
while ((bytes = my_read(tmp_file->fd, (unsigned char *)buf, buf_size,
MYF(MY_WME))) > 0) {
posix_fadvise(tmp_file->fd, offset, buf_size, POSIX_FADV_DONTNEED);
offset += buf_size;
if (ds_write(dst_file, buf, bytes)) {
die("cannot write to stream for '%s'.",
tmp_file->orig_path);
}
}
if (bytes == (size_t) -1) {
die("my_read failed for %s", tmp_file->orig_path);
}
my_close(tmp_file->fd, MYF(MY_WME));
ds_close(dst_file);
list = list_rest(list);
my_free(tmp_file->file);
}
pthread_mutex_destroy(&tmpfile_ctxt->mutex);
my_free(buf);
my_free(ctxt->root);
my_free(ctxt);
}
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