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a41ac15b96
1) on Mac OS X >=10.3, fcntl() is recommended over fsync (from the man page: "[With fsync()] the disk drive may also re-order the data so that later writes may be present while earlier writes are not. Applications such as databases that require a strict ordering of writes should use F_FULLFSYNC to ensure their data is written in the order they expect"). I have seen two other pieces of software changing from fsync to F_FULLFSYNC on Mac OS X. 2) to make a file creation/deletion/renaming durable on Linux (at least ext2 as I have tested) (see "man fsync"), a fsync() on the directory is needed: new functions to do that, and a flag MY_SYNC_DIR to do it in my_create/my_delete/my_rename. 3) now using this directory syncing when creating he frm if opt_sync_frm, and for Maria's control file when it is created. include/my_sys.h: new flag to my_create/my_delete/my_rename, which asks to sync the directory after the operation is done (currently does nothing except on Linux) libmysql/CMakeLists.txt: my_create() now depends on my_sync() so my_sync is needed for libmysql libmysql/Makefile.shared: my_create() now depends on my_sync() so my_sync is needed for libmysql mysys/my_create.c: my_create() can now sync the directory if asked for mysys/my_delete.c: my_delete() can now sync the directory if asked for mysys/my_open.c: it was a bug that my_close() is done on fd but a positive fd would still be returned, by my_register_filename(). mysys/my_rename.c: my_rename() can now sync the two directories (the one of "from" and the one of "to") if asked for. mysys/my_sync.c: On recent Mac OS X, fcntl(F_FULLFSYNC) is recommended over fsync() (see "man fsync" on Mac OS X 10.3). my_sync_dir(): to sync a directory after a file creation/deletion/ renaming; can be called directly or via MY_SYNC_DIR in my_create/ my_delete/my_rename(). No-op except on Linux (see "man fsync" on Linux). my_sync_dir_from_file(): same as above, just more practical when the caller has a file name but no directory name ready. Should the #warning even be a #error? I mean do we want to release binaries which don't guarantee any durability? sql/log.cc: a TODO for the future. sql/unireg.cc: If we sync the frm it makes sense to also sync its creation in the directory. storage/maria/ma_control_file.c: control file is vital, try to make it to disk
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "mysys_priv.h"
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#include <my_dir.h>
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#include "mysys_err.h"
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#include <errno.h>
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#if defined(__WIN__)
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#include <share.h>
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#endif
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/*
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** Create a new file
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** Arguments:
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** Path-name of file
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** Read | write on file (umask value)
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** Read & Write on open file
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** Special flags
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*/
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File my_create(const char *FileName, int CreateFlags, int access_flags,
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myf MyFlags)
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{
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int fd;
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DBUG_ENTER("my_create");
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DBUG_PRINT("my",("Name: '%s' CreateFlags: %d AccessFlags: %d MyFlags: %d",
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FileName, CreateFlags, access_flags, MyFlags));
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#if !defined(NO_OPEN_3)
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fd = open((my_string) FileName, access_flags | O_CREAT,
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CreateFlags ? CreateFlags : my_umask);
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#elif defined(VMS)
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fd = open((my_string) FileName, access_flags | O_CREAT, 0,
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"ctx=stm","ctx=bin");
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#elif defined(__WIN__)
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fd= my_sopen((my_string) FileName, access_flags | O_CREAT | O_BINARY,
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SH_DENYNO, MY_S_IREAD | MY_S_IWRITE);
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#else
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fd = open(FileName, access_flags);
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#endif
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if ((MyFlags & MY_SYNC_DIR) && (fd >=0))
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my_sync_dir_by_file(FileName, MyFlags);
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DBUG_RETURN(my_register_filename(fd, FileName, FILE_BY_CREATE,
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EE_CANTCREATEFILE, MyFlags));
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} /* my_create */
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