linux-kernel - [PATCH 09/11] fat: enable non-blocking timestamp updates

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Message-ID: <20251223003756.409543-10-hch@lst.de>
Date: Tue, 23 Dec 2025 09:37:52 +0900
From: Christoph Hellwig <hch@....de>
To: Christian Brauner <brauner@...nel.org>
Cc: Al Viro <viro@...iv.linux.org.uk>,
	David Sterba <dsterba@...e.com>,
	Jan Kara <jack@...e.cz>,
	Mike Marshall <hubcap@...ibond.com>,
	Martin Brandenburg <martin@...ibond.com>,
	Carlos Maiolino <cem@...nel.org>,
	Stefan Roesch <shr@...com>,
	Jeff Layton <jlayton@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	gfs2@...ts.linux.dev,
	io-uring@...r.kernel.org,
	devel@...ts.orangefs.org,
	linux-unionfs@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	linux-xfs@...r.kernel.org,
	linux-nfs@...r.kernel.org
Subject: [PATCH 09/11] fat: enable non-blocking timestamp updates

As fat dosn't implement ->dirty_inode, nothing in fat_update_time can
block, and fat can thus trivially implement non-blocking timestamp
updates.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/fat/misc.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 5df3193c35f9..950da09f0961 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -346,9 +346,6 @@ int fat_update_time(struct inode *inode, int flags)
 	if (inode->i_ino == MSDOS_ROOT_INO)
 		return 0;
 
-	if (flags & S_NOWAIT)
-		return -EAGAIN;
-
 	if (flags & (S_ATIME | S_CTIME | S_MTIME)) {
 		fat_truncate_time(inode, NULL, flags);
 		if (inode->i_sb->s_flags & SB_LAZYTIME)
-- 
2.47.3