[fuse-devel] [PATCH 3/9] implement nonseekable open support

[Tejun H. <tj...@ke...>]

If open sets fi->nonseekable, libfuse will tell the kernel that the
file is not seekable.

Signed-off-by: Tejun Heo <tj...@ke...>
---
 include/fuse_common.h |    6 +++++-
 include/fuse_kernel.h |    2 ++
 lib/fuse_lowlevel.c   |    2 ++
 3 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/include/fuse_common.h b/include/fuse_common.h
index f9c6c72..4d37acf 100644
--- a/include/fuse_common.h
+++ b/include/fuse_common.h
@@ -65,8 +65,12 @@ struct fuse_file_info {
 	    operation.	Introduced in version 2.6 */
 	unsigned int flush : 1;
 
+	/** Can be filled in by open, to indicate that the file is not
+	    seekable.  Introduced in version 2.9 */
+	unsigned int nonseekable : 1;
+
 	/** Padding.  Do not use*/
-	unsigned int padding : 29;
+	unsigned int padding : 28;
 
 	/** File handle.  May be filled in by filesystem in open().
 	    Available in all other file operations */
diff --git a/include/fuse_kernel.h b/include/fuse_kernel.h
index 06f1f1a..3e87106 100644
--- a/include/fuse_kernel.h
+++ b/include/fuse_kernel.h
@@ -134,9 +134,11 @@ struct fuse_file_lock {
  *
  * FOPEN_DIRECT_IO: bypass page cache for this open file
  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
+ * FOPEN_NONSEEKABLE: the file is not seekable
  */
 #define FOPEN_DIRECT_IO		(1 << 0)
 #define FOPEN_KEEP_CACHE	(1 << 1)
+#define FOPEN_NONSEEKABLE	(1 << 2)
 
 /**
  * INIT request/reply flags
diff --git a/lib/fuse_lowlevel.c b/lib/fuse_lowlevel.c
index 9d9424d..35c4608 100644
--- a/lib/fuse_lowlevel.c
+++ b/lib/fuse_lowlevel.c
@@ -325,6 +325,8 @@ static void fill_open(struct fuse_open_out *arg,
 		arg->open_flags |= FOPEN_DIRECT_IO;
 	if (f->keep_cache)
 		arg->open_flags |= FOPEN_KEEP_CACHE;
+	if (f->nonseekable)
+		arg->open_flags |= FOPEN_NONSEEKABLE;
 }
 
 int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
-- 
1.5.6