MDEV-21774 Innodb, Windows : restore file sharing logic in Innodb

recv_sys_t opened redo log files along with log_sys_t. That's why I
removed file sharing logic from InnoDB
in 9ef2d29ff44de2013c95666a011b993e5c2e5674
But it was actually used to ensure that only one MariaDB instance
will touch the same InnoDB files.

os0file.cc: revert some changes done previously

mapped_file_t::map(): now has arguments read_only, nvme

file_io::open(): now has argument read_only

class file_os_io: make final

log_file_t::open(): now has argument read_only

1 files changed, 6 insertions, 5 deletions

diff --git a/storage/innobase/include/log0log.h b/storage/innobase/include/log0log.h
index c2348e121a3..3e87e03f646 100644
--- a/storage/innobase/include/log0log.h
+++ b/storage/innobase/include/log0log.h
@@ -468,7 +468,8 @@ public:
   mapped_file_t &operator=(mapped_file_t &&)= delete;
   ~mapped_file_t() noexcept;
 
-  dberr_t map(const char *path, int flags= 0) noexcept;
+  dberr_t map(const char *path, bool read_only= false,
+              bool nvme= false) noexcept;
   dberr_t unmap() noexcept;
   byte *data() noexcept { return m_area.data(); }
 
@@ -482,7 +483,7 @@ class file_io
 public:
   file_io(bool durable_writes= false) : m_durable_writes(durable_writes) {}
   virtual ~file_io() noexcept {};
-  virtual dberr_t open(const char *path) noexcept= 0;
+  virtual dberr_t open(const char *path, bool read_only) noexcept= 0;
   virtual dberr_t rename(const char *old_path,
                          const char *new_path) noexcept= 0;
   virtual dberr_t close() noexcept= 0;
@@ -498,7 +499,7 @@ protected:
   bool m_durable_writes;
 };
 
-class file_os_io : public file_io
+class file_os_io final: public file_io
 {
 public:
   file_os_io()= default;
@@ -508,7 +509,7 @@ public:
   file_os_io &operator=(file_os_io &&rhs);
   ~file_os_io() noexcept;
 
-  dberr_t open(const char *path) noexcept final;
+  dberr_t open(const char *path, bool read_only) noexcept final;
   bool is_opened() const noexcept { return m_fd != OS_FILE_CLOSED; }
   dberr_t rename(const char *old_path, const char *new_path) noexcept final;
   dberr_t close() noexcept final;
@@ -527,7 +528,7 @@ class log_file_t
 public:
   log_file_t(std::string path= "") noexcept : m_path{std::move(path)} {}
 
-  dberr_t open() noexcept;
+  dberr_t open(bool read_only) noexcept;
   bool is_opened() const noexcept;
 
   const std::string &get_path() const noexcept { return m_path; }