linux-ext4 - [PATCH 1/4] libfuse: add strictatime/lazytime mount options

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Message-ID: <176169814339.1428390.3706681659823223489.stgit@frogsfrogsfrogs>
Date: Tue, 28 Oct 2025 18:05:33 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: djwong@...nel.org, bschubert@....com
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 bernd@...ernd.com, miklos@...redi.hu, joannelkoong@...il.com, neal@...pa.dev
Subject: [PATCH 1/4] libfuse: add strictatime/lazytime mount options

From: Darrick J. Wong <djwong@...nel.org>

fuse+iomap leaves the kernel completely in charge of handling
timestamps.  Add the lazytime and strictatime mount options so that
fuse+iomap filesystems can take advantage of those options.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 lib/mount.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)


diff --git a/lib/mount.c b/lib/mount.c
index c82fd4c293ce66..1b20c4eab92d46 100644
--- a/lib/mount.c
+++ b/lib/mount.c
@@ -117,9 +117,16 @@ static const struct fuse_opt fuse_mount_opts[] = {
 	FUSE_OPT_KEY("dirsync",			KEY_KERN_FLAG),
 	FUSE_OPT_KEY("noatime",			KEY_KERN_FLAG),
 	FUSE_OPT_KEY("nodiratime",		KEY_KERN_FLAG),
-	FUSE_OPT_KEY("nostrictatime",		KEY_KERN_FLAG),
 	FUSE_OPT_KEY("symfollow",		KEY_KERN_FLAG),
 	FUSE_OPT_KEY("nosymfollow",		KEY_KERN_FLAG),
+#ifdef MS_LAZYTIME
+	FUSE_OPT_KEY("lazytime",		KEY_KERN_FLAG),
+	FUSE_OPT_KEY("nolazytime",		KEY_KERN_FLAG),
+#endif
+#ifdef MS_STRICTATIME
+	FUSE_OPT_KEY("strictatime",		KEY_KERN_FLAG),
+	FUSE_OPT_KEY("nostrictatime",		KEY_KERN_FLAG),
+#endif
 	FUSE_OPT_END
 };
 
@@ -189,11 +196,18 @@ static const struct mount_flags mount_flags[] = {
 	{"noatime", MS_NOATIME,	    1},
 	{"nodiratime",	    MS_NODIRATIME,	1},
 	{"norelatime",	    MS_RELATIME,	0},
-	{"nostrictatime",   MS_STRICTATIME,	0},
 	{"symfollow",	    MS_NOSYMFOLLOW,	0},
 	{"nosymfollow",	    MS_NOSYMFOLLOW,	1},
 #ifndef __NetBSD__
 	{"dirsync", MS_DIRSYNC,	    1},
+#endif
+#ifdef MS_LAZYTIME
+	{"lazytime",	    MS_LAZYTIME,	1},
+	{"nolazytime",	    MS_LAZYTIME,	0},
+#endif
+#ifdef MS_STRICTATIME
+	{"strictatime",	    MS_STRICTATIME,	1},
+	{"nostrictatime",   MS_STRICTATIME,	0},
 #endif
 	{NULL,	    0,		    0}
 };