Hi,
JD wrote:
>
>
> On 09/16/2010 09:42 AM, Sameer Naik wrote:
>
>>
> Remember that a directory can only be opened by
> DIR *opendir(const char *name);
> DIR *fdopendir(int fd);
>
> Problem is, how can you fsync a dir if you cannot open it
> with the open(2) system call?
> fsync(2) needs a file descriptor.
> DIR * is not a file descriptor.
>
> And yet, the man page for fsync says:
>
> Calling fsync() does not necessarily ensure that the entry
> in the
> directory containing the file has also reached disk. For
> that an
> explicit fsync() on a file descriptor for the directory is also
> needed.
>
> Maybe someone can clear this up a bit?
You can open(2) a directory in read-only mode :
f = create("dir/file",0664);
d = open("dir",O_RDONLY);
fsync(d);
close(d);
The manual says that all dirty pages for the "*file*"
referenced by the descriptor should be flushed
(even pages not written using the descriptor).
But ntfs-3g does not sort the dirty pages by file
so any fsync(2) will flush all the dirty pages in
the partition.
Regards
Jean-Pierre
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