fuse: implement nonseekable open

htejun · szmi · commit a7c1b990f715 · 2008-10-16T16:08:57.000+02:00
Let the client request nonseekable open using FOPEN_NONSEEKABLE and
call nonseekable_open() on the file if requested.

Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Signed-off-by: Miklos Szeredi &lt;mszeredi@suse.cz&gt;
diff --git 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
@@ -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

Original file line number	Diff line number	Diff line change
`@@ -101,6 +101,8 @@ void fuse_finish_open(struct inode inode, struct file file,`
`101`	`101`	`file->f_op = &fuse_direct_io_file_operations;`
`102`	`102`	`if (!(outarg->open_flags & FOPEN_KEEP_CACHE))`
`103`	`103`	`invalidate_inode_pages2(inode->i_mapping);`
	`104`	`+ if (outarg->open_flags & FOPEN_NONSEEKABLE)`
	`105`	`+ nonseekable_open(inode, file);`
`104`	`106`	`ff->fh = outarg->fh;`
`105`	`107`	`file->private_data = fuse_file_get(ff);`
`106`	`108`	`}`