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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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8
fs/fuse/file.c
View File

@ -2371,14 +2371,14 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
loff_t offset, unsigned long nr_segs)
{
ssize_t ret = 0;
struct file *file = NULL;
struct file *file = iocb->ki_filp;
struct fuse_file *ff = file->private_data;
loff_t pos = 0;
struct inode *inode;
loff_t i_size;
size_t count = iov_length(iov, nr_segs);
struct fuse_io_priv *io;
file = iocb->ki_filp;
pos = offset;
inode = file->f_mapping->host;
i_size = i_size_read(inode);
@ -2403,9 +2403,9 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
io->file = file;
/*
* By default, we want to optimize all I/Os with async request
* submission to the client filesystem.
* submission to the client filesystem if supported.
*/
io->async = 1;
io->async = ff->fc->async_dio;
io->iocb = iocb;
/*

3
fs/fuse/fuse_i.h
View File

@ -541,6 +541,9 @@ struct fuse_conn {
/** Does the filesystem want adaptive readdirplus? */
unsigned readdirplus_auto:1;
/** Does the filesystem support asynchronous direct-IO submission? */
unsigned async_dio:1;
/** The number of requests waiting for completion */
atomic_t num_waiting;

4
fs/fuse/inode.c
View File

@ -871,6 +871,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->do_readdirplus = 1;
if (arg->flags & FUSE_READDIRPLUS_AUTO)
fc->readdirplus_auto = 1;
if (arg->flags & FUSE_ASYNC_DIO)
fc->async_dio = 1;
} else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->no_lock = 1;
@ -898,7 +900,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO;
FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);

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