linux-kernel - Re: [PATCH 4.19 082/114] fuse: Add FOPEN_STREAM to use stream

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Date:   Tue, 28 May 2019 18:47:18 +0000
From:   Kirill Smelkov <kirr@...edi.com>
To:     Pavel Machek <pavel@....cz>
Cc:     <linux-kernel@...r.kernel.org>,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: Re: [PATCH 4.19 082/114] fuse: Add FOPEN_STREAM to use stream_open()

On Tue, May 28, 2019 at 01:16:58PM +0200, Pavel Machek wrote:
> Hi!
> 
> > +++ b/include/uapi/linux/fuse.h
> > @@ -219,10 +219,12 @@ 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
> > + * FOPEN_STREAM: the file is stream-like (no file position at all)
> >   */
> >  #define FOPEN_DIRECT_IO		(1 << 0)
> >  #define FOPEN_KEEP_CACHE	(1 << 1)
> >  #define FOPEN_NONSEEKABLE	(1 << 2)
> > +#define FOPEN_STREAM		(1 << 4)
> 
> Interesting choice of constants. It is too late to change it now, but
> was (1 << 3) meant here?

It is just because this is 4.19 backport of original patch. There (on
5.2) it was like this:

--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -232,11 +232,13 @@ struct fuse_file_lock {
  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
  * FOPEN_NONSEEKABLE: the file is not seekable
  * FOPEN_CACHE_DIR: allow caching this directory
+ * FOPEN_STREAM: the file is stream-like (no file position at all)
  */
 #define FOPEN_DIRECT_IO        (1 << 0)
 #define FOPEN_KEEP_CACHE       (1 << 1)
 #define FOPEN_NONSEEKABLE      (1 << 2)
 #define FOPEN_CACHE_DIR        (1 << 3)
+#define FOPEN_STREAM           (1 << 4)
 

i.e. (1 << 3) was already occupied by FOPEN_CACHE_DIR which was added by commit
6433b8998a21 (fuse: add FOPEN_CACHE_DIR)

Kirill