[PATCH V11 02/11] fs: Remove unneeded IS_DAX() check in io_is_direct()

ira.weiny
2020-04-28T00:22:42Z

From: Ira Weiny <ira.weiny@intel.com>

Remove the check because DAX now has it's own read/write methods and
file systems which support DAX check IS_DAX() prior to IOCB_DIRECT on
their own. Therefore, it does not matter if the file state is DAX when
the iocb flags are created.

Also remove io_is_direct() as it is just a simple flag check.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
Changes from v8:
Rebase to latest Linus tree

Changes from v6:
remove io_is_direct() as well.
Remove Reviews since this is quite a bit different.

Changes from v3:
Reword commit message.
Reordered to be a 'pre-cleanup' patch
---
drivers/block/loop.c | 6 +++---
include/linux/fs.h | 7 +------
2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index da693e6a834e..14372df0f354 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -634,8 +634,8 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)

static inline void loop_update_dio(struct loop_device *lo)
{
- __loop_update_dio(lo, io_is_direct(lo->lo_backing_file) |
- lo->use_dio);
+ __loop_update_dio(lo, (lo->lo_backing_file->f_flags & O_DIRECT) |
+ lo->use_dio);
}

static void loop_reread_partitions(struct loop_device *lo,
@@ -1028,7 +1028,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync)
blk_queue_write_cache(lo->lo_queue, true, false);

- if (io_is_direct(lo->lo_backing_file) && inode->i_sb->s_bdev) {
+ if ((lo->lo_backing_file->f_flags & O_DIRECT) && inode->i_sb->s_bdev) {
/* In case of direct I/O, match underlying block size */
unsigned short bsize = bdev_logical_block_size(
inode->i_sb->s_bdev);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4f6f59b4f22a..a87cc5845a02 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3394,11 +3394,6 @@ extern void setattr_copy(struct inode *inode, const struct iattr *attr);

extern int file_update_time(struct file *file);

-static inline bool io_is_direct(struct file *filp)
-{
- return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host);
-}
-
static inline bool vma_is_dax(const struct vm_area_struct *vma)
{
return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
@@ -3423,7 +3418,7 @@ static inline int iocb_flags(struct file *file)
int res = 0;
if (file->f_flags & O_APPEND)
res |= IOCB_APPEND;
- if (io_is_direct(file))
+ if (file->f_flags & O_DIRECT)
res |= IOCB_DIRECT;
if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
res |= IOCB_DSYNC;
--
2.25.1