linux-ext4 - [RFCv4 4/9] ext2: Use generic_buffer

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Message-Id: <ab353c31861853abe4836143dc2674c463bdd986.1681544352.git.ritesh.list@gmail.com>
Date:   Sat, 15 Apr 2023 13:14:25 +0530
From:   "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
To:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Cc:     Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@...radead.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
        Disha Goel <disgoel@...ux.ibm.com>,
        "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Subject: [RFCv4 4/9] ext2: Use generic_buffer_fsync() implementation

Next patch converts ext2 to use iomap interface for DIO.
iomap layer can call generic_write_sync() -> ext2_fsync() from
iomap_dio_complete while still holding the inode_lock().

Now writeback from other paths doesn't need inode_lock().
It seems there is also no need of an inode_lock() for
sync_mapping_buffers(). It uses it's own mapping->private_lock
for it's buffer list handling.
Hence this patch is in preparation to move ext2 to iomap.
This uses generic_buffer_fsync() which does not take any inode_lock()
in ext2_fsync().

Tested-by: Disha Goel <disgoel@...ux.ibm.com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
---
 fs/ext2/file.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 6b4bebe982ca..7603427fb38f 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -25,6 +25,7 @@
 #include <linux/quotaops.h>
 #include <linux/iomap.h>
 #include <linux/uio.h>
+#include <linux/buffer_head.h>
 #include "ext2.h"
 #include "xattr.h"
 #include "acl.h"
@@ -153,7 +154,9 @@ int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 	int ret;
 	struct super_block *sb = file->f_mapping->host->i_sb;
 
-	ret = generic_file_fsync(file, start, end, datasync);
+	ret = generic_buffer_fsync(file, start, end, datasync);
+	if (!ret)
+		ret = blkdev_issue_flush(sb->s_bdev);
 	if (ret == -EIO)
 		/* We don't really know where the IO error happened... */
 		ext2_error(sb, __func__,
-- 
2.39.2