fuse: document fuse_fsync_in.fsync_flags

The FUSE_FSYNC_DATASYNC flag was introduced by commit b6aeadeda22a
("[PATCH] FUSE - file operations") as a magic number.  No new values have
been added to fsync_flags since.

Signed-off-by: Alan Somers <asomers@FreeBSD.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 92ee15dda4c79716c0a3b9c67e487cb2a2f00664..1f9da7a5ad0d947bce9e4292be8bdcfda203d3f3 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -464,7 +464,7 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
 
        memset(&inarg, 0, sizeof(inarg));
        inarg.fh = ff->fh;
-       inarg.fsync_flags = datasync ? 1 : 0;
+       inarg.fsync_flags = datasync ? FUSE_FSYNC_FDATASYNC : 0;
        args.in.h.opcode = opcode;
        args.in.h.nodeid = get_node_id(inode);
        args.in.numargs = 1;

diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 17afe2dd8d1ca82790a665a1e371bbaf17a0423b..59d5048df41e1a6f5aa5dbf3a97330c802554300 100644 (file)
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -360,6 +360,13 @@ struct fuse_file_lock {
  */
 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
 
+/**
+ * Fsync flags
+ *
+ * FUSE_FSYNC_FDATASYNC: Sync data only, not metadata
+ */
+#define FUSE_FSYNC_FDATASYNC   (1 << 0)
+
 enum fuse_opcode {
        FUSE_LOOKUP             = 1,
        FUSE_FORGET             = 2,  /* no reply */