From fa8d972d055c723cc427e14d4d7919640f418730 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 20 Jul 2016 11:38:01 +1000 Subject: [PATCH] xfs: direct calls in the direct I/O path We control both the callers and callees of ->direct_IO, so remove the indirect calls. Signed-off-by: Christoph Hellwig Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_aops.c | 24 +++++------------------- fs/xfs/xfs_aops.h | 3 +++ fs/xfs/xfs_file.c | 17 +++++++++++++++-- 3 files changed, 23 insertions(+), 21 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 4c463b9..3ba0809 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -1336,7 +1336,7 @@ xfs_get_blocks_dax_fault( * whereas if we have flags set we will always be called in task context * (i.e. from a workqueue). */ -STATIC int +int xfs_end_io_direct_write( struct kiocb *iocb, loff_t offset, @@ -1407,24 +1407,10 @@ xfs_vm_direct_IO( struct kiocb *iocb, struct iov_iter *iter) { - struct inode *inode = iocb->ki_filp->f_mapping->host; - dio_iodone_t *endio = NULL; - int flags = 0; - struct block_device *bdev; - - if (iov_iter_rw(iter) == WRITE) { - endio = xfs_end_io_direct_write; - flags = DIO_ASYNC_EXTEND; - } - - if (IS_DAX(inode)) { - return dax_do_io(iocb, inode, iter, - xfs_get_blocks_direct, endio, 0); - } - - bdev = xfs_find_bdev_for_inode(inode); - return __blockdev_direct_IO(iocb, inode, bdev, iter, - xfs_get_blocks_direct, endio, NULL, flags); + /* + * We just need the method present so that open/fcntl allow direct I/O. + */ + return -EINVAL; } /* diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h index 814aab7..bf2d9a1 100644 --- a/fs/xfs/xfs_aops.h +++ b/fs/xfs/xfs_aops.h @@ -60,6 +60,9 @@ int xfs_get_blocks_direct(struct inode *inode, sector_t offset, int xfs_get_blocks_dax_fault(struct inode *inode, sector_t offset, struct buffer_head *map_bh, int create); +int xfs_end_io_direct_write(struct kiocb *iocb, loff_t offset, + ssize_t size, void *private); + extern void xfs_count_page_state(struct page *, int *, int *); extern struct block_device *xfs_find_bdev_for_inode(struct inode *); diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 440bb8b..dd5185d 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -360,7 +360,13 @@ xfs_file_dio_aio_read( } data = *to; - ret = mapping->a_ops->direct_IO(iocb, &data); + if (IS_DAX(inode)) { + ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct, + NULL, 0); + } else { + ret = __blockdev_direct_IO(iocb, inode, target->bt_bdev, &data, + xfs_get_blocks_direct, NULL, NULL, 0); + } if (ret > 0) { iocb->ki_pos += ret; iov_iter_advance(to, ret); @@ -819,7 +825,14 @@ xfs_file_dio_aio_write( trace_xfs_file_direct_write(ip, count, iocb->ki_pos); data = *from; - ret = mapping->a_ops->direct_IO(iocb, &data); + if (IS_DAX(inode)) { + ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct, + xfs_end_io_direct_write, 0); + } else { + ret = __blockdev_direct_IO(iocb, inode, target->bt_bdev, &data, + xfs_get_blocks_direct, xfs_end_io_direct_write, + NULL, DIO_ASYNC_EXTEND); + } /* see generic_file_direct_write() for why this is necessary */ if (mapping->nrpages) { -- 2.7.4