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fuse: Turn writeback cache on

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Introduce a bit kernel and userspace exchange between each-other on
the init stage and turn writeback on if the userspace want this and
mount option 'allow_wbcache' is present (controlled by fusermount).

Also add each writable file into per-inode write list and call the
generic_file_aio_write to make use of the Linux page cache engine.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Pavel Emelyanov
2013-10-10 17:12:18 +04:00
committed by Miklos Szeredi
parent ea8cd33390
commit 4d99ff8f12
3 changed files with 21 additions and 2 deletions
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7
include/uapi/linux/fuse.h
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@@ -93,6 +93,9 @@
*
* 7.22
* - add FUSE_ASYNC_DIO
*
* 7.23
* - add FUSE_WRITEBACK_CACHE
*/
#ifndef _LINUX_FUSE_H
@@ -128,7 +131,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 22
#define FUSE_KERNEL_MINOR_VERSION 23
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -219,6 +222,7 @@ struct fuse_file_lock {
* FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one)
* FUSE_READDIRPLUS_AUTO: adaptive readdirplus
* FUSE_ASYNC_DIO: asynchronous direct I/O submission
* FUSE_WRITEBACK_CACHE: use writeback cache for buffered writes
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@@ -236,6 +240,7 @@ struct fuse_file_lock {
#define FUSE_DO_READDIRPLUS (1 << 13)
#define FUSE_READDIRPLUS_AUTO (1 << 14)
#define FUSE_ASYNC_DIO (1 << 15)
#define FUSE_WRITEBACK_CACHE (1 << 16)
/**
* CUSE INIT request/reply flags