I'm doing the same thing with fsync(). :-)
Jeff
Ulrich Kunitz wrote:
>
> Hi,
>
> this discusses item 5.1 in Alan's list of outstanding fixes before 2.4.
>
> I'm using fsync to write out all dirty pages/blocks of a file in
> generic_file_write to get O_SYNC behaviour. Patch is included below. It
> is the wrong way to do O_SYNC? I've checked this and it seems to do what
> would be expected and it caused no harm to me.
>
> Another idea would be to use sync_page() in generic_file_write() that
> calls block_sync_page() for ext2. block_sync_page() calls only
> run_rask_queue(tq_disk). IMHO adding of sync_page_buffers() to
> block_sync_page() would be required and there is still the inode and
> superblock infos, that need to be written to disk before
> generic_file_write() returns.
>
> Which kernel version did support O_SYNC for ext2? AFAIK 2.2 kernels
> don't support O_SYNC.
>
> This is my patch:
>
> --- linux-2.3.99-pre8/mm/filemap.c Sat May 13 10:13:32 2000
> +++ linux-2.3.99-pre8-uk1/mm/filemap.c Sat May 13 10:43:21 2000
> @@ -39,6 +39,8 @@
> * page-cache, 21.05.1999, Ingo Molnar <mingo@redhat.com>
> *
> * SMP-threaded pagemap-LRU 1999, Andrea Arcangeli <andrea@suse.de>
> + *
> + * O_SYNC support, 29. 4. 2000, Ulrich Kunitz <gefm21@uumail,de>
> */
>
> atomic_t page_cache_size = ATOMIC_INIT(0);
> @@ -2521,7 +2523,14 @@
> if (cached_page)
> page_cache_free(cached_page);
>
> + if ((file->f_flags & O_SYNC) && file->f_op && file->f_op->fsync) {
> + err = file->f_op->fsync(file, file->f_dentry);
> + if (err < 0)
> + status = err;
> + }
> +
> err = written ? written : status;
> +
> out:
> up(&inode->i_sem);
> return err;
>
> Ciao,
>
> Uli Kunitz
>
> --
> Ulrich Kunitz (gefm21@uumail.de)
>
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