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os0file.c Always do fsync after a file write to reduce possibility of a partially written page in an OS crash

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buf0rea.c	Fixed a recovery hang associated with ibuf bitmap pages
This commit is contained in:
heikki@donna.mysql.fi 2001-04-26 16:36:59 +03:00
commit 0f9a30ab86
2 changed files with 33 additions and 5 deletions
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6
innobase/buf/buf0rea.c
View file

@ -73,11 +73,13 @@ buf_read_page_low(
sync = TRUE;
}
#endif
if (trx_sys_hdr_page(space, offset)) {
if (ibuf_bitmap_page(offset) || trx_sys_hdr_page(space, offset)) {
/* Trx sys header is so low in the latching order that we play
safe and do not leave the i/o-completion to an asynchronous
i/o-thread: */
i/o-thread. Ibuf bitmap pages must always be read with
syncronous i/o, to make sure they do not get involved in
thread deadlocks. */
sync = TRUE;
}

32
innobase/os/os0file.c
View file

@ -559,10 +559,18 @@ os_file_pwrite(
ulint n, /* in: number of bytes to write */
ulint offset) /* in: offset where to write */
{
#ifdef HAVE_PWRITE
return(pwrite(file, buf, n, (off_t) offset));
#else
ssize_t ret;
#ifdef HAVE_PWRITE
ret = pwrite(file, buf, n, (off_t) offset);
/* Always do fsync to reduce the probability that when the OS crashes,
a database page is only partially physically written to disk. */
ut_a(TRUE == os_file_flush(file));
return(ret);
#else
ulint i;
/* Protect the seek / write operation with a mutex */
@ -580,6 +588,11 @@ os_file_pwrite(
ret = write(file, buf, n);
/* Always do fsync to reduce the probability that when the OS crashes,
a database page is only partially physically written to disk. */
ut_a(TRUE == os_file_flush(file));
os_mutex_exit(os_file_seek_mutexes[i]);
return(ret);
@ -734,6 +747,11 @@ try_again:
ret = WriteFile(file, buf, n, &len, NULL);
/* Always do fsync to reduce the probability that when the OS crashes,
a database page is only partially physically written to disk. */
ut_a(TRUE == os_file_flush(file));
os_mutex_exit(os_file_seek_mutexes[i]);
if (ret && len == n) {
@ -1497,6 +1515,10 @@ os_aio_windows_handle(
if (ret && len == slot->len) {
ret_val = TRUE;
if (slot->type == OS_FILE_WRITE) {
ut_a(TRUE == os_file_flush(slot->file));
}
} else {
err = GetLastError();
ut_error;
@ -1578,6 +1600,10 @@ os_aio_posix_handle(
*message1 = slot->message1;
*message2 = slot->message2;
if (slot->type == OS_FILE_WRITE) {
ut_a(TRUE == os_file_flush(slot->file));
}
os_mutex_exit(array->mutex);
os_aio_array_free_slot(array, slot);