From 1d4457576570627e1702614bc060b55d95b85e39 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 20 Dec 2024 08:47:49 -0700
Subject: [PATCH] mm: call filemap_fdatawrite_range_kick() after IOCB_DONTCACHE
 issue

When a buffered write submitted with IOCB_DONTCACHE has been successfully
submitted, call filemap_fdatawrite_range_kick() to kick off the IO.  File
systems call generic_write_sync() for any successful buffered write
submission, hence add the logic here rather than needing to modify the
file system.

Link: https://lkml.kernel.org/r/20241220154831.1086649-12-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Cc: Brian Foster <bfoster@redhat.com>
Cc: Chris Mason <clm@meta.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/fs.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 653b5efa3d3f..58a618853574 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2912,6 +2912,11 @@ static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count)
 				(iocb->ki_flags & IOCB_SYNC) ? 0 : 1);
 		if (ret)
 			return ret;
+	} else if (iocb->ki_flags & IOCB_DONTCACHE) {
+		struct address_space *mapping = iocb->ki_filp->f_mapping;
+
+		filemap_fdatawrite_range_kick(mapping, iocb->ki_pos,
+					      iocb->ki_pos + count);
 	}
 
 	return count;