diff options
| author | Christoph Hellwig <hch@infradead.org> | 2014-02-10 10:27:11 +1100 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2014-02-10 10:27:11 +1100 |
| commit | 6039257378e4c84da06e68230b14fef955508ce6 (patch) | |
| tree | 87f5681b75c36d4b6d395f92a82ffe7b1b1dde5a /fs/direct-io.c | |
| parent | 38dbfb59d1175ef458d006556061adeaa8751b72 (diff) | |
| download | linux-6039257378e4c84da06e68230b14fef955508ce6.tar.gz linux-6039257378e4c84da06e68230b14fef955508ce6.tar.bz2 linux-6039257378e4c84da06e68230b14fef955508ce6.zip | |
direct-io: add flag to allow aio writes beyond i_size
Some filesystems can handle direct I/O writes beyond i_size safely,
so allow them to opt into receiving them.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/direct-io.c')
| -rw-r--r-- | fs/direct-io.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index 160a5489a939..a701752dd750 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -1194,13 +1194,19 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, } /* - * For file extending writes updating i_size before data - * writeouts complete can expose uninitialized blocks. So - * even for AIO, we need to wait for i/o to complete before - * returning in this case. + * For file extending writes updating i_size before data writeouts + * complete can expose uninitialized blocks in dumb filesystems. + * In that case we need to wait for I/O completion even if asked + * for an asynchronous write. */ - dio->is_async = !is_sync_kiocb(iocb) && !((rw & WRITE) && - (end > i_size_read(inode))); + if (is_sync_kiocb(iocb)) + dio->is_async = false; + else if (!(dio->flags & DIO_ASYNC_EXTEND) && + (rw & WRITE) && end > i_size_read(inode)) + dio->is_async = false; + else + dio->is_async = true; + dio->inode = inode; dio->rw = rw; |