fuse: implement nonseekable open

Let the client request nonseekable open using FOPEN_NONSEEKABLE and
call nonseekable_open() on the file if requested.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

2 files changed, 8 insertions, 1 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 98079aa800e8..34930a964b82 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -101,6 +101,8 @@ void fuse_finish_open(struct inode *inode, struct file *file,
                 file->f_op = &fuse_direct_io_file_operations;
         if (!(outarg->open_flags & FOPEN_KEEP_CACHE))
                 invalidate_inode_pages2(inode->i_mapping);
+        if (outarg->open_flags & FOPEN_NONSEEKABLE)
+                nonseekable_open(inode, file);
         ff->fh = outarg->fh;
         file->private_data = fuse_file_get(ff);
 }
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index 8bc1101e9b35..350fe9767bbc 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -17,6 +17,9 @@
  *  - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
  *  - add blksize field to fuse_attr
  *  - add file flags field to fuse_read_in and fuse_write_in
+ *
+ * 7.10
+ *  - add nonseekable open flag
  */
 
 #ifndef _LINUX_FUSE_H
@@ -29,7 +32,7 @@
 #define FUSE_KERNEL_VERSION 7
 
 /** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 9
+#define FUSE_KERNEL_MINOR_VERSION 10
 
 /** The node ID of the root inode */
 #define FUSE_ROOT_ID 1
@@ -101,9 +104,11 @@ 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