12-07-2009
The only major distribution that I know has already adopted ext4 is Ubuntu. And what I've been following on various reports on it, Theodor Tso is still adding and modifying features ,mostly, I think, because he's got (understandable) beef with the way KDE and GNOME use a huge load of very small files, and the way a lot applications use fsync() instead of fdatasync().
Generally, I'd advise against ext4 for a production system just yet.
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LEARN ABOUT OSF1
fdatasync
fdatasync(2) System Calls Manual fdatasync(2)
NAME
fdatasync - Writes data changes in a file to permanent storage
SYNOPSIS
#include <unistd.h>
int fdatasync ( int fildes );
PARAMETERS
Specifies a valid open file descriptor.
DESCRIPTION
The fdatasync function causes system buffers containing a file's modified data to be written to permanent storage. The fdatasync function
does not return until the operation has been completed. The fdatasync function provides data integrity, ensuring that data in permanent
storage is identical to data in the buffer. However, use of fdatasync does not guarantee that file control information such as owner and
modification time has been updated to permanent storage (see the fsync function).
NOTES
The file identified by the fildes parameter must be open for writing when the fdatasync function is issued or the call will fail.
RETURN VALUES
Upon successful completion, the fdatasync function returns a value of 0 (zero). If the fdatasync function fails, a value of -1 is returned
and errno is set to indicate the error. If fdatasync fails, outstanding I/O operations are not guaranteed to have been completed.
ERRORS
If the fdatasync function fails, errno may be set to one of the following values:
[EBADF] The fildes parameter is not a valid file descriptor.
[EINVAL] The fildes parameter does not refer to a file on which this operation is possible.
If any queued I/O operations fail, the fdatasync function returns error conditions defined for the read and write functions.
RELATED INFORMATION
Functions: fcntl(2), fsync(2), open(2), read(2), sync(2), write(2) delim off
fdatasync(2)