MDEV-16264: Remove IORequest::IGNORE_MISSING

After MDEV-11556, not even crash recovery should attempt to access
non-existing pages. But, buf_load() is not validating its input
and must thus be able to ignore missing pages, so that is why
buf_read_page_background() does that.

storage/innobase/buf/buf0rea.cc

@@ -100,12 +100,11 @@ flag is cleared and the x-lock released by an i/o-handler thread.
 			if we are trying
 			to read from a non-existent tablespace
 @param[in] sync		true if synchronous aio is desired
-@param[in] type		IO type, SIMULATED, IGNORE_MISSING
 @param[in] mode		BUF_READ_IBUF_PAGES_ONLY, ...,
 @param[in] page_id	page id
 @param[in] zip_size	ROW_FORMAT=COMPRESSED page size, or 0
 @param[in] unzip	true=request uncompressed page
-@param[in] ignore_missing_space  true=ignore missing space when reading
+@param[in] ignore	whether to ignore out-of-bounds page_id
 @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
@@ -115,12 +114,11 @@ ulint
 buf_read_page_low(
 	dberr_t*		err,
 	bool			sync,
-	ulint			type,
 	ulint			mode,
 	const page_id_t		page_id,
 	ulint			zip_size,
 	bool			unzip,
-	bool			ignore_missing_space = false)
+	bool			ignore = false)
 {
 	buf_page_t*	bpage;
 
@@ -176,20 +174,17 @@ buf_read_page_low(
 		dst = ((buf_block_t*) bpage)->frame;
 	}
 
-	IORequest	request(type | IORequest::READ);
-
 	*err = fil_io(
-		request, sync, page_id, zip_size, 0,
+		IORequestRead, sync, page_id, zip_size, 0,
 		zip_size ? zip_size : srv_page_size,
-		dst, bpage, ignore_missing_space);
+		dst, bpage, ignore);
 
 	if (sync) {
 		thd_wait_end(NULL);
 	}
 
 	if (UNIV_UNLIKELY(*err != DB_SUCCESS)) {
-		if (IORequest::ignore_missing(type)
-		    || *err == DB_TABLESPACE_DELETED) {
+		if (ignore || *err == DB_TABLESPACE_DELETED) {
 			buf_read_page_handle_error(bpage);
 			return(0);
 		}
@@ -344,7 +339,6 @@ buf_read_ahead_random(const page_id_t page_id, ulint zip_size, bool ibuf)
 		if (!ibuf_bitmap_page(cur_page_id, zip_size)) {
 			count += buf_read_page_low(
 				&err, false,
-				0,
 				ibuf_mode,
 				cur_page_id, zip_size, false);
 
@@ -404,8 +398,7 @@ dberr_t buf_read_page(const page_id_t page_id, ulint zip_size)
 	of the buffer pool mutex becomes an expensive bottleneck. */
 
 	count = buf_read_page_low(
-		&err, true,
-		0, BUF_READ_ANY_PAGE, page_id, zip_size, false);
+		&err, true, BUF_READ_ANY_PAGE, page_id, zip_size, false);
 
 	srv_stats.buf_pool_reads.add(count);
 
@@ -435,9 +428,8 @@ buf_read_page_background(const page_id_t page_id, ulint zip_size, bool sync)
 
 	count = buf_read_page_low(
 		&err, sync,
-		IORequest::IGNORE_MISSING,
 		BUF_READ_ANY_PAGE,
-		page_id, zip_size, false);
+		page_id, zip_size, false, true);
 
 	switch (err) {
 	case DB_SUCCESS:
@@ -707,7 +699,6 @@ buf_read_ahead_linear(const page_id_t page_id, ulint zip_size, bool ibuf)
 		if (!ibuf_bitmap_page(cur_page_id, zip_size)) {
 			count += buf_read_page_low(
 				&err, false,
-				0,
 				ibuf_mode, cur_page_id, zip_size, false);
 
 			switch (err) {
@@ -792,20 +783,9 @@ buf_read_recv_pages(
 		}
 
 		dberr_t err;
-
-		if (sync && i + 1 == n_stored) {
-			buf_read_page_low(
-				&err, true,
-				0,
-				BUF_READ_ANY_PAGE,
-				cur_page_id, zip_size, true);
-		} else {
-			buf_read_page_low(
-				&err, false,
-				0,
-				BUF_READ_ANY_PAGE,
-				cur_page_id, zip_size, true);
-		}
+		buf_read_page_low(
+			&err, sync && i + 1 == n_stored,
+			BUF_READ_ANY_PAGE, cur_page_id, zip_size, true);
 
 		if (err == DB_DECRYPTION_FAILED || err == DB_PAGE_CORRUPTED) {
 			ib::error() << "Recovery failed to read or decrypt "

storage/innobase/fil/fil0fil.cc

@@ -4097,7 +4097,7 @@ inline void IORequest::set_fil_node(fil_node_t* node)
 			aligned
 @param[in] message	message for aio handler if non-sync aio
 			used, else ignored
-@param[in] ignore_missing_space true=ignore missing space duging read
+@param[in] ignore	whether to ignore out-of-bounds page_id
 @return DB_SUCCESS, or DB_TABLESPACE_DELETED
 	if we are trying to do i/o on a tablespace which does not exist */
 dberr_t
@@ -4110,7 +4110,7 @@ fil_io(
 	ulint			len,
 	void*			buf,
 	void*			message,
-	bool			ignore_missing_space)
+	bool			ignore)
 {
 	os_offset_t		offset;
 	IORequest		req_type(type);
@@ -4181,7 +4181,7 @@ fil_io(
 
 		mutex_exit(&fil_system.mutex);
 
-		if (!req_type.ignore_missing() && !ignore_missing_space) {
+		if (!ignore) {
 			ib::error()
 				<< "Trying to do I/O to a tablespace which"
 				" does not exist. I/O type: "
@@ -4199,8 +4199,7 @@ fil_io(
 	for (;;) {
 
 		if (node == NULL) {
-
-			if (req_type.ignore_missing()) {
+			if (ignore) {
 				mutex_exit(&fil_system.mutex);
 				return(DB_ERROR);
 			}
@@ -4234,7 +4233,7 @@ fil_io(
 		    && fil_is_user_tablespace_id(space->id)) {
 			mutex_exit(&fil_system.mutex);
 
-			if (!req_type.ignore_missing()) {
+			if (!ignore) {
 				ib::error()
 					<< "Trying to do I/O to a tablespace"
 					" which exists without .ibd data file."
@@ -4262,8 +4261,7 @@ fil_io(
 	if (node->size <= cur_page_no
 	    && space->id != TRX_SYS_SPACE
 	    && fil_type_is_data(space->purpose)) {
-
-		if (req_type.ignore_missing()) {
+		if (ignore) {
 			/* If we can tolerate the non-existent pages, we
 			should return with DB_ERROR and let caller decide
 			what to do. */

storage/innobase/include/fil0fil.h

@@ -1420,7 +1420,7 @@ fil_space_extend(
 				aligned
 @param[in]	message		message for aio handler if non-sync aio
 				used, else ignored
-@param[in]	ignore_missing_space true=ignore missing space during read
+@param[in]	ignore		whether to ignore out-of-bounds page_id
 @return DB_SUCCESS, or DB_TABLESPACE_DELETED
 if we are trying to do i/o on a tablespace which does not exist */
 dberr_t
@@ -1433,7 +1433,7 @@ fil_io(
 	ulint			len,
 	void*			buf,
 	void*			message,
-	bool			ignore_missing_space = false);
+	bool			ignore = false);
 
 /**********************************************************************//**
 Waits for an aio operation to complete. This function is used to write the

storage/innobase/include/os0file.h

@@ -215,12 +215,8 @@ class IORequest {
 		/** Disable partial read warnings */
 		DISABLE_PARTIAL_IO_WARNINGS = 32,
 
-
-		/** Ignore failed reads of non-existent pages */
-		IGNORE_MISSING = 128,
-
 		/** Use punch hole if available*/
-		PUNCH_HOLE = 256,
+		PUNCH_HOLE = 64,
 	};
 
 	/** Default constructor */
@@ -269,13 +265,6 @@ class IORequest {
 	/** Destructor */
 	~IORequest() { }
 
-	/** @return true if ignore missing flag is set */
-	static bool ignore_missing(ulint type)
-		MY_ATTRIBUTE((warn_unused_result))
-	{
-		return((type & IGNORE_MISSING) == IGNORE_MISSING);
-	}
-
 	/** @return true if it is a read request */
 	bool is_read() const
 		MY_ATTRIBUTE((warn_unused_result))
@@ -317,13 +306,6 @@ class IORequest {
 		m_type |= DISABLE_PARTIAL_IO_WARNINGS;
 	}
 
-	/** @return true if missing files should be ignored */
-	bool ignore_missing() const
-		MY_ATTRIBUTE((warn_unused_result))
-	{
-		return(ignore_missing(m_type));
-	}
-
 	/** @return true if punch hole should be used */
 	bool punch_hole() const
 		MY_ATTRIBUTE((warn_unused_result))