linux-ext4 - [PATCH 06/22] libfuse: add upper-level iomap add device function

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Message-ID: <176169813641.1427432.4373717443417893238.stgit@frogsfrogsfrogs>
Date: Tue, 28 Oct 2025 18:00:52 -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 06/22] libfuse: add upper-level iomap add device function

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

Make it so that the upper level fuse library can add iomap devices too.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 include/fuse.h         |   19 +++++++++++++++++++
 lib/fuse.c             |   16 ++++++++++++++++
 lib/fuse_versionscript |    2 ++
 3 files changed, 37 insertions(+)


diff --git a/include/fuse.h b/include/fuse.h
index 958034a539abe6..524b77b5d7bbd0 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -1381,6 +1381,25 @@ void fuse_fs_init(struct fuse_fs *fs, struct fuse_conn_info *conn,
 		struct fuse_config *cfg);
 void fuse_fs_destroy(struct fuse_fs *fs);
 
+/**
+ * Attach an open file descriptor to a fuse+iomap mount.  Currently must be
+ * a block device.
+ *
+ * @param fd file descriptor of an open block device
+ * @param flags flags for the operation; none defined so far
+ * @return positive nonzero device id on success, or negative errno on failure
+ */
+int fuse_fs_iomap_device_add(int fd, unsigned int flags);
+
+/**
+ * Detach an open file from a fuse+iomap mount.  Must be a device id returned
+ * by fuse_lowlevel_iomap_device_add.
+ *
+ * @param device_id device index as returned by fuse_lowlevel_iomap_device_add
+ * @return 0 on success, or negative errno on failure
+ */
+int fuse_fs_iomap_device_remove(int device_id);
+
 int fuse_notify_poll(struct fuse_pollhandle *ph);
 
 /**
diff --git a/lib/fuse.c b/lib/fuse.c
index 6f86edb07ba5d2..0d9dfe83608e1e 100644
--- a/lib/fuse.c
+++ b/lib/fuse.c
@@ -2836,6 +2836,22 @@ static int fuse_fs_iomap_end(struct fuse_fs *fs, const char *path,
 				written, iomap);
 }
 
+int fuse_fs_iomap_device_add(int fd, unsigned int flags)
+{
+	struct fuse_context *ctxt = fuse_get_context();
+	struct fuse_session *se = fuse_get_session(ctxt->fuse);
+
+	return fuse_lowlevel_iomap_device_add(se, fd, flags);
+}
+
+int fuse_fs_iomap_device_remove(int device_id)
+{
+	struct fuse_context *ctxt = fuse_get_context();
+	struct fuse_session *se = fuse_get_session(ctxt->fuse);
+
+	return fuse_lowlevel_iomap_device_remove(se, device_id);
+}
+
 static void fuse_lib_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
 			     int valid, struct fuse_file_info *fi)
 {
diff --git a/lib/fuse_versionscript b/lib/fuse_versionscript
index e796100c5ee414..c42fae5d4a3c50 100644
--- a/lib/fuse_versionscript
+++ b/lib/fuse_versionscript
@@ -224,6 +224,8 @@ FUSE_3.99 {
 		fuse_reply_iomap_begin;
 		fuse_lowlevel_iomap_device_add;
 		fuse_lowlevel_iomap_device_remove;
+		fuse_fs_iomap_device_add;
+		fuse_fs_iomap_device_remove;
 } FUSE_3.18;
 
 # Local Variables: