/********************************************************************//**
Low-level function which reads a page asynchronously from a file to the
buffer buf_pool if it is not already there, in which case does nothing.
Sets the io_fix flag and sets an exclusive lock on the buffer frame. The
flag is cleared and the x-lock released by an i/o-handler thread.
@return 1 if a read request was queued, 0 if the page already resided
in buf_pool, or if the page is in the doublewrite buffer blocks in
which case it is never read into the pool, or if the tablespace does
not exist or is being dropped
@return 1 if read request is issued. 0 if it is not */
UNIV_INTERN
ulint
buf_read_page_low(
/*==============*/
ulint* err, /*!< out: DB_SUCCESS or DB_TABLESPACE_DELETED if we are
trying to read from a non-existent tablespace, or a
tablespace which is just now being dropped */
ibool sync, /*!< in: TRUE if synchronous aio is desired */
ulint mode, /*!< in: BUF_READ_IBUF_PAGES_ONLY, ...,
ORed to OS_AIO_SIMULATED_WAKE_LATER (see below
at read-ahead functions) */
ulint space, /*!< in: space id */
ulint zip_size,/*!< in: compressed page size, or 0 */
ibool unzip, /*!< in: TRUE=request uncompressed page */
ib_int64_t tablespace_version, /*!< in: if the space memory object has
this timestamp different from what we are giving here,
treat the tablespace as dropped; this is a timestamp we
use to stop dangling page reads from a tablespace
which we have DISCARDed + IMPORTed back */
ulint offset, /*!< in: page number */
trx_t* trx)
{
buf_page_t* bpage;
ulint wake_later;
*err = DB_SUCCESS;
wake_later = mode & OS_AIO_SIMULATED_WAKE_LATER;
mode = mode & ~OS_AIO_SIMULATED_WAKE_LATER;
if (trx_doublewrite
&& (space == TRX_SYS_SPACE
|| (srv_doublewrite_file && space == TRX_DOUBLEWRITE_SPACE))
&& ( (offset >= trx_doublewrite->block1
&& offset < trx_doublewrite->block1
+ TRX_SYS_DOUBLEWRITE_BLOCK_SIZE)
|| (offset >= trx_doublewrite->block2
&& offset < trx_doublewrite->block2
+ TRX_SYS_DOUBLEWRITE_BLOCK_SIZE))) {
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: Warning: trying to read"
" doublewrite buffer page %lu\n",
(ulong) offset);
return(0);
}
if (ibuf_bitmap_page(zip_size, 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. Ibuf bitmap pages must always be read with
syncronous i/o, to make sure they do not get involved in
thread deadlocks. */
sync = TRUE;
}
/* The following call will also check if the tablespace does not exist
or is being dropped; if we succeed in initing the page in the buffer
pool for read, then DISCARD cannot proceed until the read has
completed */
bpage = buf_page_init_for_read(err, mode, space, zip_size, unzip,
tablespace_version, offset);
if (bpage == NULL) {
/* bugfix: http://bugs.mysql.com/bug.php?id=43948 */
if (recv_recovery_is_on() && *err == DB_TABLESPACE_DELETED) {
/* hashed log recs must be treated here */
recv_addr_t* recv_addr;
mutex_enter(&(recv_sys->mutex));
if (recv_sys->apply_log_recs == FALSE) {
mutex_exit(&(recv_sys->mutex));
goto not_to_recover;
}
/* recv_get_fil_addr_struct() */
recv_addr = HASH_GET_FIRST(recv_sys->addr_hash,
hash_calc_hash(ut_fold_ulint_pair(space, offset),
recv_sys->addr_hash));
while (recv_addr) {
if ((recv_addr->space == space)
&& (recv_addr->page_no == offset)) {
break;
}
recv_addr = HASH_GET_NEXT(addr_hash, recv_addr);
}
if ((recv_addr == NULL)
|| (recv_addr->state == RECV_BEING_PROCESSED)
|| (recv_addr->state == RECV_PROCESSED)) {
mutex_exit(&(recv_sys->mutex));
goto not_to_recover;
}
fprintf(stderr, " (cannot find space: %lu)", space);
recv_addr->state = RECV_PROCESSED;
ut_a(recv_sys->n_addrs);
recv_sys->n_addrs--;
mutex_exit(&(recv_sys->mutex));
}
not_to_recover:
return(0);
}
#ifdef UNIV_DEBUG
if (buf_debug_prints) {
fprintf(stderr,
"Posting read request for page %lu, sync %lu\n",
(ulong) offset,
(ulong) sync);
}
#endif
ut_ad(buf_page_in_file(bpage));
if(sync) {
thd_wait_begin(NULL, THD_WAIT_DISKIO);
}
if (zip_size) {
*err = _fil_io(OS_FILE_READ | wake_later,
sync, space, zip_size, offset, 0, zip_size,
bpage->zip.data, bpage, trx);
} else {
ut_a(buf_page_get_state(bpage) == BUF_BLOCK_FILE_PAGE);
*err = _fil_io(OS_FILE_READ | wake_later,
sync, space, 0, offset, 0, UNIV_PAGE_SIZE,
((buf_block_t*) bpage)->frame, bpage, trx);
}
if (sync) {
thd_wait_end(NULL);
}
if (*err == DB_TABLESPACE_DELETED) {
buf_read_page_handle_error(bpage);
return(0);
}
if (srv_pass_corrupt_table) {
if (*err != DB_SUCCESS) {
bpage->is_corrupt = TRUE;
}
} else {
ut_a(*err == DB_SUCCESS);
}
if (sync) {
/* The i/o is already completed when we arrive from
fil_read */
if (!buf_page_io_complete(bpage)) {
return(0);
}
}
return(1);
}
/********************************************************************//**
Low-level function which reads a page asynchronously from a file to the
buffer buf_pool if it is not already there, in which case does nothing.
Sets the io_fix flag and sets an exclusive lock on the buffer frame. The
flag is cleared and the x-lock released by an i/o-handler thread.
@return 1 if a read request was queued, 0 if the page already resided
in buf_pool, or if the page is in the doublewrite buffer blocks in
which case it is never read into the pool, or if the tablespace does
not exist or is being dropped
@return 1 if read request is issued. 0 if it is not */
static
ulint
buf_read_page_low(
/*==============*/
ulint* err, /*!< out: DB_SUCCESS or DB_TABLESPACE_DELETED if we are
trying to read from a non-existent tablespace, or a
tablespace which is just now being dropped */
ibool sync, /*!< in: TRUE if synchronous aio is desired */
ulint mode, /*!< in: BUF_READ_IBUF_PAGES_ONLY, ...,
ORed to OS_AIO_SIMULATED_WAKE_LATER (see below
at read-ahead functions) */
ulint space, /*!< in: space id */
ulint zip_size,/*!< in: compressed page size, or 0 */
ibool unzip, /*!< in: TRUE=request uncompressed page */
ib_int64_t tablespace_version, /*!< in: if the space memory object has
this timestamp different from what we are giving here,
treat the tablespace as dropped; this is a timestamp we
use to stop dangling page reads from a tablespace
which we have DISCARDed + IMPORTed back */
ulint offset) /*!< in: page number */
{
buf_page_t* bpage;
ulint wake_later;
*err = DB_SUCCESS;
wake_later = mode & OS_AIO_SIMULATED_WAKE_LATER;
mode = mode & ~OS_AIO_SIMULATED_WAKE_LATER;
if (trx_doublewrite && space == TRX_SYS_SPACE
&& ( (offset >= trx_doublewrite->block1
&& offset < trx_doublewrite->block1
+ TRX_SYS_DOUBLEWRITE_BLOCK_SIZE)
|| (offset >= trx_doublewrite->block2
&& offset < trx_doublewrite->block2
+ TRX_SYS_DOUBLEWRITE_BLOCK_SIZE))) {
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: Warning: trying to read"
" doublewrite buffer page %lu\n",
(ulong) offset);
return(0);
}
if (ibuf_bitmap_page(zip_size, 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. Ibuf bitmap pages must always be read with
syncronous i/o, to make sure they do not get involved in
thread deadlocks. */
sync = TRUE;
}
/* The following call will also check if the tablespace does not exist
or is being dropped; if we succeed in initing the page in the buffer
pool for read, then DISCARD cannot proceed until the read has
completed */
bpage = buf_page_init_for_read(err, mode, space, zip_size, unzip,
tablespace_version, offset);
if (bpage == NULL) {
return(0);
}
#ifdef UNIV_DEBUG
if (buf_debug_prints) {
fprintf(stderr,
"Posting read request for page %lu, sync %lu\n",
(ulong) offset,
(ulong) sync);
}
#endif
ut_ad(buf_page_in_file(bpage));
if (zip_size) {
*err = fil_io(OS_FILE_READ | wake_later,
sync, space, zip_size, offset, 0, zip_size,
bpage->zip.data, bpage);
} else {
ut_a(buf_page_get_state(bpage) == BUF_BLOCK_FILE_PAGE);
*err = fil_io(OS_FILE_READ | wake_later,
sync, space, 0, offset, 0, UNIV_PAGE_SIZE,
((buf_block_t*) bpage)->frame, bpage);
}
ut_a(*err == DB_SUCCESS);
if (sync) {
/* The i/o is already completed when we arrive from
fil_read */
buf_page_io_complete(bpage);
}
return(1);
}
