linux-ext4 - [PATCH V7 2/9] fs: Remove unneeded IS_DAX() check in io_is

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Date:   Sun, 12 Apr 2020 22:40:39 -0700
From:   ira.weiny@...el.com
To:     linux-kernel@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>,
        Jeff Moyer <jmoyer@...hat.com>, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH V7 2/9] fs: Remove unneeded IS_DAX() check in io_is_direct()

From: Ira Weiny <ira.weiny@...el.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.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
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 739b372a5112..9a9af78974ac 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -631,8 +631,8 @@ 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,
@@ -1006,7 +1006,7 @@ 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 abedbffe2c9e..a818ced22961 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3387,11 +3387,6 @@ 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(struct vm_area_struct *vma)
 {
 	return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
@@ -3416,7 +3411,7 @@ 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