From 6e1ba0bcb84b3f97616feb07c27f974509ba57be Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Thu, 4 Jun 2015 09:19:15 +1000 Subject: xfs: add DAX IO path support DAX does not do buffered IO (can't buffer direct access!) and hence all read/write IO is vectored through the direct IO path. Hence we need to add the DAX IO path callouts to the direct IO infrastructure. Signed-off-by: Dave Chinner Reviewed-by: Brian Foster Signed-off-by: Dave Chinner --- fs/xfs/xfs_aops.c | 36 +++++++++++++++++++++++++++--------- 1 file changed, 27 insertions(+), 9 deletions(-) (limited to 'fs/xfs') diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 1d195e80d62e..e5e9fc23f230 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -1657,6 +1657,29 @@ xfs_end_io_dax_write( void xfs_end_io_dax_write(struct buffer_head *bh, int uptodate) { } #endif +static inline ssize_t +xfs_vm_do_dio( + struct inode *inode, + struct kiocb *iocb, + struct iov_iter *iter, + loff_t offset, + void (*endio)(struct kiocb *iocb, + loff_t offset, + ssize_t size, + void *private), + int flags) +{ + struct block_device *bdev; + + if (IS_DAX(inode)) + return dax_do_io(iocb, inode, iter, offset, + xfs_get_blocks_direct, endio, 0); + + bdev = xfs_find_bdev_for_inode(inode); + return __blockdev_direct_IO(iocb, inode, bdev, iter, offset, + xfs_get_blocks_direct, endio, NULL, flags); +} + STATIC ssize_t xfs_vm_direct_IO( struct kiocb *iocb, @@ -1664,16 +1687,11 @@ xfs_vm_direct_IO( loff_t offset) { struct inode *inode = iocb->ki_filp->f_mapping->host; - struct block_device *bdev = xfs_find_bdev_for_inode(inode); - if (iov_iter_rw(iter) == WRITE) { - return __blockdev_direct_IO(iocb, inode, bdev, iter, offset, - xfs_get_blocks_direct, - xfs_end_io_direct_write, NULL, - DIO_ASYNC_EXTEND); - } - return __blockdev_direct_IO(iocb, inode, bdev, iter, offset, - xfs_get_blocks_direct, NULL, NULL, 0); + if (iov_iter_rw(iter) == WRITE) + return xfs_vm_do_dio(inode, iocb, iter, offset, + xfs_end_io_direct_write, DIO_ASYNC_EXTEND); + return xfs_vm_do_dio(inode, iocb, iter, offset, NULL, 0); } /* -- cgit v1.2.3