linux-ext4 - [PATCH 17/22] libfuse: add upper-level API to invalidate parts of an iomap block device

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Message-ID: <176169813840.1427432.11872191487359495335.stgit@frogsfrogsfrogs>
Date: Tue, 28 Oct 2025 18:03:44 -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 17/22] libfuse: add upper-level API to invalidate parts of an
 iomap block device

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

Wire up the upper-level wrappers to
fuse_lowlevel_iomap_invalidate_device.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 include/fuse.h         |   10 ++++++++++
 lib/fuse.c             |    9 +++++++++
 lib/fuse_versionscript |    1 +
 3 files changed, 20 insertions(+)


diff --git a/include/fuse.h b/include/fuse.h
index 74b86e8d27fb35..e53e92786cea08 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -1422,6 +1422,16 @@ int fuse_fs_iomap_device_add(int fd, unsigned int flags);
  */
 int fuse_fs_iomap_device_remove(int device_id);
 
+/**
+ * Invalidate any pagecache for the given iomap (block) device.
+ *
+ * @param device_id device index as returned by fuse_lowlevel_iomap_device_add
+ * @param offset starting offset of the range to invalidate
+ * @param length length of the range to invalidate
+ * @return 0 on success, or negative errno on failure
+ */
+int fuse_fs_iomap_device_invalidate(int device_id, off_t offset, off_t length);
+
 /**
  * Decide if we can enable iomap mode for a particular file for an upper-level
  * fuse server.
diff --git a/lib/fuse.c b/lib/fuse.c
index 1fec6371b7bc81..ed2bd3da212743 100644
--- a/lib/fuse.c
+++ b/lib/fuse.c
@@ -2921,6 +2921,15 @@ int fuse_fs_iomap_device_remove(int device_id)
 	return fuse_lowlevel_iomap_device_remove(se, device_id);
 }
 
+int fuse_fs_iomap_device_invalidate(int device_id, off_t offset, off_t length)
+{
+	struct fuse_context *ctxt = fuse_get_context();
+	struct fuse_session *se = fuse_get_session(ctxt->fuse);
+
+	return fuse_lowlevel_iomap_device_invalidate(se, device_id, offset,
+						     length);
+}
+
 static int fuse_fs_iomap_ioend(struct fuse_fs *fs, const char *path,
 			       uint64_t nodeid, uint64_t attr_ino, off_t pos,
 			       size_t written, uint32_t ioendflags, int error,
diff --git a/lib/fuse_versionscript b/lib/fuse_versionscript
index d268471ae5bd38..a275b53c6f9f1a 100644
--- a/lib/fuse_versionscript
+++ b/lib/fuse_versionscript
@@ -235,6 +235,7 @@ FUSE_3.99 {
 		fuse_lowlevel_discover_iomap;
 		fuse_reply_iomap_config;
 		fuse_lowlevel_iomap_device_invalidate;
+		fuse_fs_iomap_device_invalidate;
 } FUSE_3.18;
 
 # Local Variables: