renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-11-18 23:54:26 +08:00
Code

[PATCH] fuse: fix async read for legacy filesystems

Browse Source 
While asynchronous reads mean a performance improvement in most cases, if
the filesystem assumed that reads are synchronous, then async reads may
degrade performance (filesystem may receive reads out of order, which can
confuse it's own readahead logic).

With sshfs a 1.5 to 4 times slowdown can be measured.

There's also a need for userspace filesystems to know whether asynchronous
reads are supported by the kernel or not.

To achive these, negotiate in the INIT request whether async reads will be
used and the maximum readahead value.  Update interface version to 7.6

If userspace uses a version earlier than 7.6, then disable async reads, and
set maximum readahead value to the maximum read size, as done in previous
versions.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Miklos Szeredi 2006-02-01 03:04:40 -08:00 committed by Linus Torvalds
parent caf736085f
commit 9cd6845511
4 changed files with 36 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/fuse/file.c
View File

@ -335,9 +335,14 @@ static void fuse_send_readpages(struct fuse_req *req, struct file *file,
loff_t pos = page_offset(req->pages[0]);
size_t count = req->num_pages << PAGE_CACHE_SHIFT;
req->out.page_zeroing = 1;
req->end = fuse_readpages_end;
fuse_read_fill(req, file, inode, pos, count, FUSE_READ);
request_send_background(fc, req);
if (fc->async_read) {
req->end = fuse_readpages_end;
request_send_background(fc, req);
} else {
request_send(fc, req);
fuse_readpages_end(fc, req);
}
}
struct fuse_readpages_data {

3
fs/fuse/fuse_i.h
View File

@ -272,6 +272,9 @@ struct fuse_conn {
reply, before any other request, and never cleared */
unsigned conn_error : 1;
/** Do readpages asynchronously? Only set in INIT */
unsigned async_read : 1;
/*
* The following bitfields are only for optimization purposes
* and hence races in setting them will not cause malfunction

14
fs/fuse/inode.c
View File

@ -473,6 +473,16 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
fc->conn_error = 1;
else {
unsigned long ra_pages;
if (arg->minor >= 6) {
ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
if (arg->flags & FUSE_ASYNC_READ)
fc->async_read = 1;
} else
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
fc->minor = arg->minor;
fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
}
@ -496,6 +506,8 @@ static void fuse_send_init(struct fuse_conn *fc)
arg->major = FUSE_KERNEL_VERSION;
arg->minor = FUSE_KERNEL_MINOR_VERSION;
arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
arg->flags |= FUSE_ASYNC_READ;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
@ -552,8 +564,6 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
fc->user_id = d.user_id;
fc->group_id = d.group_id;
fc->max_read = d.max_read;
if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages)
fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE;
/* Used by get_root_inode() */
sb->s_fs_info = fc;

16
include/linux/fuse.h
View File

@ -14,7 +14,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 5
#define FUSE_KERNEL_MINOR_VERSION 6
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@ -58,6 +58,9 @@ struct fuse_kstatfs {
__u32 spare[6];
};
/**
* Bitmasks for fuse_setattr_in.valid
*/
#define FATTR_MODE (1 << 0)
#define FATTR_UID (1 << 1)
#define FATTR_GID (1 << 2)
@ -75,6 +78,11 @@ struct fuse_kstatfs {
#define FOPEN_DIRECT_IO (1 << 0)
#define FOPEN_KEEP_CACHE (1 << 1)
/**
* INIT request/reply flags
*/
#define FUSE_ASYNC_READ (1 << 0)
enum fuse_opcode {
FUSE_LOOKUP = 1,
FUSE_FORGET = 2, /* no reply */
@ -247,12 +255,16 @@ struct fuse_access_in {
struct fuse_init_in {
__u32 major;
__u32 minor;
__u32 max_readahead;
__u32 flags;
};
struct fuse_init_out {
__u32 major;
__u32 minor;
__u32 unused[3];
__u32 max_readahead;
__u32 flags;
__u32 unused;
__u32 max_write;
};