From 3f53a96a8bd0cd4a18f819b6857e6a764706ede5 Mon Sep 17 00:00:00 2001 From: Filipe David Manana Date: Thu, 22 Apr 2010 23:40:26 +0100 Subject: Add file:datasync/1 for syncing file contents only file:datasync/1 invokes the POSIX system call "int fdatasync(int fd)". This system call is similar to "fsync" but, unlike fsync, it does not update the metadata associated with the file (like the access time for example). It's used by many DBMSs (MySQL and SQLite of example) to increase disk IO performance, as it avoids disk seeks and disk write operations compared to fsync. More details on it at: http://linux.die.net/man/2/fdatasync An example, from the MySQL source: http://bazaar.launchpad.net/~mysql/mysql-server/mysql-5.1-telco-6.1/annotate/head%3A/mysys/my_sync.c#L61 This new function just calls fsync on systems not implementing fdatasync. --- erts/emulator/drivers/unix/unix_efile.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'erts/emulator/drivers/unix') diff --git a/erts/emulator/drivers/unix/unix_efile.c b/erts/emulator/drivers/unix/unix_efile.c index 1d094ee613..0cece76221 100644 --- a/erts/emulator/drivers/unix/unix_efile.c +++ b/erts/emulator/drivers/unix/unix_efile.c @@ -773,6 +773,17 @@ efile_closefile(int fd) close(fd); } +int +efile_fdatasync(Efile_error *errInfo, /* Where to return error codes. */ + int fd) /* File descriptor for file to sync data. */ +{ +#ifdef HAVE_FDATASYNC + return check_error(fdatasync(fd), errInfo); +#else + return efile_fsync(errInfo, fd); +#endif +} + int efile_fsync(Efile_error *errInfo, /* Where to return error codes. */ int fd) /* File descriptor for file to sync. */ -- cgit v1.2.3