linux-ext4 - [PATCH] ext4: set FMODE_CAN_ODIRECT instead of a dummy direct

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Date:   Mon, 12 Jun 2023 07:37:31 +0200
From:   Christoph Hellwig <hch@....de>
To:     tytso@....edu
Cc:     linux-ext4@...r.kernel.org
Subject: [PATCH] ext4: set FMODE_CAN_ODIRECT instead of a dummy direct_IO method

Since commit a2ad63daa88b ("VFS: add FMODE_CAN_ODIRECT file flag") file
systems can just set the FMODE_CAN_ODIRECT flag at open time instead of
wiring up a dummy direct_IO method to indicate support for direct I/O.

Do that for ext4 so that noop_direct_IO can eventually be removed.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/ext4/file.c  | 2 +-
 fs/ext4/inode.c | 4 ----
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index d101b3b0c7dad8..a1d8ffbf571274 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -900,7 +900,7 @@ static int ext4_file_open(struct inode *inode, struct file *filp)
 	}
 
 	filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC |
-			FMODE_DIO_PARALLEL_WRITE;
+			FMODE_DIO_PARALLEL_WRITE | FMODE_CAN_ODIRECT;
 	return dquot_file_open(inode, filp);
 }
 
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 02de439bf1f04e..b9c1cfa1864779 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3539,7 +3539,6 @@ static const struct address_space_operations ext4_aops = {
 	.bmap			= ext4_bmap,
 	.invalidate_folio	= ext4_invalidate_folio,
 	.release_folio		= ext4_release_folio,
-	.direct_IO		= noop_direct_IO,
 	.migrate_folio		= buffer_migrate_folio,
 	.is_partially_uptodate  = block_is_partially_uptodate,
 	.error_remove_page	= generic_error_remove_page,
@@ -3556,7 +3555,6 @@ static const struct address_space_operations ext4_journalled_aops = {
 	.bmap			= ext4_bmap,
 	.invalidate_folio	= ext4_journalled_invalidate_folio,
 	.release_folio		= ext4_release_folio,
-	.direct_IO		= noop_direct_IO,
 	.migrate_folio		= buffer_migrate_folio_norefs,
 	.is_partially_uptodate  = block_is_partially_uptodate,
 	.error_remove_page	= generic_error_remove_page,
@@ -3573,7 +3571,6 @@ static const struct address_space_operations ext4_da_aops = {
 	.bmap			= ext4_bmap,
 	.invalidate_folio	= ext4_invalidate_folio,
 	.release_folio		= ext4_release_folio,
-	.direct_IO		= noop_direct_IO,
 	.migrate_folio		= buffer_migrate_folio,
 	.is_partially_uptodate  = block_is_partially_uptodate,
 	.error_remove_page	= generic_error_remove_page,
@@ -3582,7 +3579,6 @@ static const struct address_space_operations ext4_da_aops = {
 
 static const struct address_space_operations ext4_dax_aops = {
 	.writepages		= ext4_dax_writepages,
-	.direct_IO		= noop_direct_IO,
 	.dirty_folio		= noop_dirty_folio,
 	.bmap			= ext4_bmap,
 	.swap_activate		= ext4_iomap_swap_activate,
-- 
2.39.2