linux-ext4 - [PATCH 21/22] fuse2fs: add strictatime/lazytime mount options

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Message-ID: <175279461413.715479.7362461117350070043.stgit@frogsfrogsfrogs>
Date: Thu, 17 Jul 2025 16:44:51 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: tytso@....edu
Cc: joannelkoong@...il.com, miklos@...redi.hu, John@...ves.net,
 linux-fsdevel@...r.kernel.org, bernd@...ernd.com, linux-ext4@...r.kernel.org,
 neal@...pa.dev
Subject: [PATCH 21/22] fuse2fs: add strictatime/lazytime mount options

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

In iomap mode, we can support the strictatime/lazytime mount options.
Add them to fuse2fs.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 misc/fuse2fs.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)


diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index e71fcbaeeaf0c6..b5f665ada36991 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -262,6 +262,7 @@ struct fuse2fs {
 	uint8_t unmount_in_destroy;
 	uint8_t noblkdev;
 	uint8_t can_hardlink;
+	uint8_t iomap_passthrough_options;
 
 	enum fuse2fs_opstate opstate;
 	int blocklog;
@@ -1370,6 +1371,10 @@ static void *op_init(struct fuse_conn_info *conn
 		err_printf(ff, "%s\n", _("could not enable iomap."));
 		goto mount_fail;
 	}
+	if (ff->iomap_passthrough_options && !fuse2fs_iomap_enabled(ff)) {
+		err_printf(ff, "%s\n", _("some mount options require iomap."));
+		goto mount_fail;
+	}
 #endif
 #if defined(HAVE_FUSE_IOMAP) && defined(FUSE_CAP_IOMAP_DIRECTIO)
 	if (fuse2fs_iomap_enabled(ff))
@@ -6228,6 +6233,7 @@ enum {
 	FUSE2FS_ERRORS_BEHAVIOR,
 #ifdef HAVE_FUSE_IOMAP
 	FUSE2FS_IOMAP,
+	FUSE2FS_IOMAP_PASSTHROUGH,
 #endif
 };
 
@@ -6251,6 +6257,17 @@ static struct fuse_opt fuse2fs_opts[] = {
 	FUSE2FS_OPT("lockfile=%s",	lockfile,		0),
 	FUSE2FS_OPT("noblkdev",		noblkdev,		1),
 
+#ifdef HAVE_FUSE_IOMAP
+#ifdef MS_LAZYTIME
+	FUSE_OPT_KEY("lazytime",	FUSE2FS_IOMAP_PASSTHROUGH),
+	FUSE_OPT_KEY("nolazytime",	FUSE2FS_IOMAP_PASSTHROUGH),
+#endif
+#ifdef MS_STRICTATIME
+	FUSE_OPT_KEY("strictatime",	FUSE2FS_IOMAP_PASSTHROUGH),
+	FUSE_OPT_KEY("nostrictatime",	FUSE2FS_IOMAP_PASSTHROUGH),
+#endif
+#endif
+
 	FUSE_OPT_KEY("user_xattr",	FUSE2FS_IGNORED),
 	FUSE_OPT_KEY("noblock_validity", FUSE2FS_IGNORED),
 	FUSE_OPT_KEY("nodelalloc",	FUSE2FS_IGNORED),
@@ -6277,6 +6294,12 @@ static int fuse2fs_opt_proc(void *data, const char *arg,
 	struct fuse2fs *ff = data;
 
 	switch (key) {
+#ifdef HAVE_FUSE_IOMAP
+	case FUSE2FS_IOMAP_PASSTHROUGH:
+		ff->iomap_passthrough_options = 1;
+		/* pass through to libfuse */
+		return 1;
+#endif
 	case FUSE2FS_DIRSYNC:
 		ff->dirsync = 1;
 		/* pass through to libfuse */