[PATCH 06/14] libfuse: add upper level iomap ioend commands

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Teach the upper level fuse library about iomap ioend events, which
happen when a write that isn't a pure overwrite completes.

Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
 include/fuse.h |    8 ++++++++
 lib/fuse.c     |   45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)


diff --git a/include/fuse.h b/include/fuse.h
index 6b25586e768285..e2e7c950bf144d 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -868,6 +868,14 @@ struct fuse_operations {
 			  off_t pos_in, uint64_t length_in,
 			  uint32_t opflags_in, ssize_t written_in,
 			  const struct fuse_iomap *iomap_in);
+
+	/**
+	 * Respond to the outcome of a file IO operation.
+	 */
+	int (*iomap_ioend) (const char *path, uint64_t nodeid,
+			    uint64_t attr_ino, off_t pos_in, size_t written_in,
+			    uint32_t ioendflags_in, int error_in,
+			    uint64_t new_addr_in);
 #endif /* FUSE_USE_VERSION >= 318 */
 };
 
diff --git a/lib/fuse.c b/lib/fuse.c
index aa4287e0896761..8dbf88877dd37c 100644
--- a/lib/fuse.c
+++ b/lib/fuse.c
@@ -2776,6 +2776,26 @@ static int fuse_fs_iomap_end(struct fuse_fs *fs, const char *path,
 				written, iomap);
 }
 
+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,
+			       uint64_t new_addr)
+{
+	fuse_get_context()->private_data = fs->user_data;
+	if (!fs->op.iomap_ioend)
+		return 0;
+
+	if (fs->debug) {
+		fuse_log(FUSE_LOG_DEBUG,
+			 "iomap_ioend[%s] nodeid %llu attr_ino %llu pos %llu written %zu ioendflags 0x%x error %d\n",
+			 path, nodeid, attr_ino, pos, written, ioendflags,
+			 error);
+	}
+
+	return fs->op.iomap_ioend(path, nodeid, attr_ino, pos, written,
+				  ioendflags, error, new_addr);
+}
+
 static void fuse_lib_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
 			     int valid, struct fuse_file_info *fi)
 {
@@ -4466,6 +4486,30 @@ static void fuse_lib_iomap_end(fuse_req_t req, fuse_ino_t nodeid,
 	reply_err(req, err);
 }
 
+static void fuse_lib_iomap_ioend(fuse_req_t req, fuse_ino_t nodeid,
+				 uint64_t attr_ino, off_t pos, size_t written,
+				 uint32_t ioendflags, int error,
+				 uint64_t new_addr)
+{
+	struct fuse *f = req_fuse_prepare(req);
+	struct fuse_intr_data d;
+	char *path;
+	int err;
+
+	err = get_path_nullok(f, nodeid, &path);
+	if (err) {
+		reply_err(req, err);
+		return;
+	}
+
+	fuse_prepare_interrupt(f, req, &d);
+	err = fuse_fs_iomap_ioend(f->fs, path, nodeid, attr_ino, pos, written,
+				  ioendflags, error, new_addr);
+	fuse_finish_interrupt(f, req, &d);
+	free_path(f, nodeid, path);
+	reply_err(req, err);
+}
+
 static int clean_delay(struct fuse *f)
 {
 	/*
@@ -4566,6 +4610,7 @@ static struct fuse_lowlevel_ops fuse_path_ops = {
 	.lseek = fuse_lib_lseek,
 	.iomap_begin = fuse_lib_iomap_begin,
 	.iomap_end = fuse_lib_iomap_end,
+	.iomap_ioend = fuse_lib_iomap_ioend,
 };
 
 int fuse_notify_poll(struct fuse_pollhandle *ph)