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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 <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2015-06-04 09:19:15 +10:00 committed by Dave Chinner
parent 9969441f9f
commit 6e1ba0bcb8
1 changed files with 27 additions and 9 deletions
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36
fs/xfs/xfs_aops.c
View File

@ -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);
}
/*