Commit 3ec870d5 authored by Miklos Szeredi's avatar Miklos Szeredi Committed by Linus Torvalds
Browse files

[PATCH] fuse: make maximum write data configurable 



Make the maximum size of write data configurable by the filesystem.  The
previous fixed 4096 limit only worked on architectures where the page size is
less or equal to this.  This change make writing work on other architectures
too, and also lets the filesystem receive bigger write requests in direct_io
mode.

Normal writes which go through the page cache are still limited to a page
sized chunk per request.

Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1d3d752b

fs/fuse/dev.c

+30 −18
Original line number Diff line number Diff line
@@ -148,6 +148,26 @@ void fuse_release_background(struct fuse_req *req) 
	spin_unlock(&fuse_lock);

}



static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)

{

	int i;

	struct fuse_init_out *arg = &req->misc.init_out;



	if (arg->major != FUSE_KERNEL_VERSION)

		fc->conn_error = 1;

	else {

		fc->minor = arg->minor;

		fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;

	}



	/* After INIT reply is received other requests can go

	   out.  So do (FUSE_MAX_OUTSTANDING - 1) number of

	   up()s on outstanding_sem.  The last up() is done in

	   fuse_putback_request() */

	for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)

		up(&fc->outstanding_sem);

}



/*

 * This function is called when a request is finished.  Either a reply

 * has arrived or it was interrupted (and not yet sent) or some error
@@ -172,21 +192,9 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req) 
		up_read(&fc->sbput_sem);

	}

	wake_up(&req->waitq);

	if (req->in.h.opcode == FUSE_INIT) {

		int i;



		if (req->misc.init_in_out.major != FUSE_KERNEL_VERSION)

			fc->conn_error = 1;



		fc->minor = req->misc.init_in_out.minor;



		/* After INIT reply is received other requests can go

		   out.  So do (FUSE_MAX_OUTSTANDING - 1) number of

		   up()s on outstanding_sem.  The last up() is done in

		   fuse_putback_request() */

		for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)

			up(&fc->outstanding_sem);

	} else if (req->in.h.opcode == FUSE_RELEASE && req->inode == NULL) {

	if (req->in.h.opcode == FUSE_INIT)

		process_init_reply(fc, req);

	else if (req->in.h.opcode == FUSE_RELEASE && req->inode == NULL) {

		/* Special case for failed iget in CREATE */

		u64 nodeid = req->in.h.nodeid;

		__fuse_get_request(req);
@@ -359,7 +367,7 @@ void fuse_send_init(struct fuse_conn *fc) 
	/* This is called from fuse_read_super() so there's guaranteed

	   to be a request available */

	struct fuse_req *req = do_get_request(fc);

	struct fuse_init_in_out *arg = &req->misc.init_in_out;

	struct fuse_init_in *arg = &req->misc.init_in;

	arg->major = FUSE_KERNEL_VERSION;

	arg->minor = FUSE_KERNEL_MINOR_VERSION;

	req->in.h.opcode = FUSE_INIT;
@@ -367,8 +375,12 @@ void fuse_send_init(struct fuse_conn *fc) 
	req->in.args[0].size = sizeof(*arg);

	req->in.args[0].value = arg;

	req->out.numargs = 1;

	req->out.args[0].size = sizeof(*arg);

	req->out.args[0].value = arg;

	/* Variable length arguement used for backward compatibility

	   with interface version < 7.5.  Rest of init_out is zeroed

	   by do_get_request(), so a short reply is not a problem */

	req->out.argvar = 1;

	req->out.args[0].size = sizeof(struct fuse_init_out);

	req->out.args[0].value = &req->misc.init_out;

	request_send_background(fc, req);

}

fs/fuse/fuse_i.h

+2 −4
Original line number Diff line number Diff line
@@ -21,9 +21,6 @@ 
/** If more requests are outstanding, then the operation will block */

#define FUSE_MAX_OUTSTANDING 10



/** Maximum size of data in a write request */

#define FUSE_MAX_WRITE 4096



/** It could be as large as PATH_MAX, but would that have any uses? */

#define FUSE_NAME_MAX 1024
@@ -162,7 +159,8 @@ struct fuse_req { 
	union {

		struct fuse_forget_in forget_in;

		struct fuse_release_in release_in;

		struct fuse_init_in_out init_in_out;

		struct fuse_init_in init_in;

		struct fuse_init_out init_out;

	} misc;



	/** page vector */

fs/fuse/inode.c

+0 −1
Original line number Diff line number Diff line
@@ -485,7 +485,6 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent) 
	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;

	fc->max_write = FUSE_MAX_WRITE;



	err = -ENOMEM;

	root = get_root_inode(sb, d.rootmode);

include/linux/fuse.h

+9 −2
Original line number Diff line number Diff line
@@ -14,7 +14,7 @@ 
#define FUSE_KERNEL_VERSION 7



/** Minor version number of this interface */

#define FUSE_KERNEL_MINOR_VERSION 4

#define FUSE_KERNEL_MINOR_VERSION 5



/** The node ID of the root inode */

#define FUSE_ROOT_ID 1
@@ -244,11 +244,18 @@ struct fuse_access_in { 
	__u32	padding;

};



struct fuse_init_in_out {

struct fuse_init_in {

	__u32	major;

	__u32	minor;

};



struct fuse_init_out {

	__u32	major;

	__u32	minor;

	__u32	unused[3];

	__u32	max_write;

};



struct fuse_in_header {

	__u32	len;

	__u32	opcode;

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