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fuse: add flag to turn on async direct IO

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Without async DIO write requests to a single file were always serialized.
With async DIO that's no longer the case.

So don't turn on async DIO by default for fear of breaking backward
compatibility.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Miklos Szeredi 2013-05-01 14:37:21 +02:00
parent efb9fa9e91
commit 60b9df7a54
4 changed files with 16 additions and 6 deletions
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7
include/uapi/linux/fuse.h
View file

@ -90,6 +90,9 @@
* 7.21
* - add FUSE_READDIRPLUS
* - send the requested events in POLL request
*
* 7.22
* - add FUSE_ASYNC_DIO
*/
#ifndef _LINUX_FUSE_H
@ -125,7 +128,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 21
#define FUSE_KERNEL_MINOR_VERSION 22
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@ -215,6 +218,7 @@ struct fuse_file_lock {
* FUSE_AUTO_INVAL_DATA: automatically invalidate cached pages
* FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one)
* FUSE_READDIRPLUS_AUTO: adaptive readdirplus
* FUSE_ASYNC_DIO: asynchronous direct I/O submission
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@ -231,6 +235,7 @@ struct fuse_file_lock {
#define FUSE_AUTO_INVAL_DATA (1 << 12)
#define FUSE_DO_READDIRPLUS (1 << 13)
#define FUSE_READDIRPLUS_AUTO (1 << 14)
#define FUSE_ASYNC_DIO (1 << 15)
/**
* CUSE INIT request/reply flags