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Commit 05ba1f08 authored by Anatol Pomozov's avatar Anatol Pomozov Committed by Miklos Szeredi
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fuse: add FALLOCATE operation 



fallocate filesystem operation preallocates media space for the given file.
If fallocate returns success then any subsequent write to the given range
never fails with 'not enough space' error.

Signed-off-by: default avatarAnatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
parent e2690695

fs/fuse/file.c

+33 −0
Original line number Diff line number Diff line
@@ -2171,6 +2171,37 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, 
	return ret;

}



long fuse_file_fallocate(struct file *file, int mode, loff_t offset,

			    loff_t length)

{

	struct fuse_file *ff = file->private_data;

	struct fuse_conn *fc = ff->fc;

	struct fuse_req *req;

	struct fuse_fallocate_in inarg = {

		.fh = ff->fh,

		.offset = offset,

		.length = length,

		.mode = mode

	};

	int err;



	req = fuse_get_req(fc);

	if (IS_ERR(req))

		return PTR_ERR(req);



	req->in.h.opcode = FUSE_FALLOCATE;

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

	req->in.numargs = 1;

	req->in.args[0].size = sizeof(inarg);

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

	fuse_request_send(fc, req);

	err = req->out.h.error;

	fuse_put_request(fc, req);



	return err;

}

EXPORT_SYMBOL_GPL(fuse_file_fallocate);



static const struct file_operations fuse_file_operations = {

	.llseek		= fuse_file_llseek,

	.read		= do_sync_read,
@@ -2188,6 +2219,7 @@ static const struct file_operations fuse_file_operations = { 
	.unlocked_ioctl	= fuse_file_ioctl,

	.compat_ioctl	= fuse_file_compat_ioctl,

	.poll		= fuse_file_poll,

	.fallocate	= fuse_file_fallocate,

};



static const struct file_operations fuse_direct_io_file_operations = {
@@ -2204,6 +2236,7 @@ static const struct file_operations fuse_direct_io_file_operations = { 
	.unlocked_ioctl	= fuse_file_ioctl,

	.compat_ioctl	= fuse_file_compat_ioctl,

	.poll		= fuse_file_poll,

	.fallocate	= fuse_file_fallocate,

	/* no splice_read */

};

include/linux/fuse.h

+13 −1
Original line number Diff line number Diff line
@@ -54,6 +54,9 @@ 
 * 7.18

 *  - add FUSE_IOCTL_DIR flag

 *  - add FUSE_NOTIFY_DELETE

 *

 * 7.19

 *  - add FUSE_FALLOCATE

 */



#ifndef _LINUX_FUSE_H
@@ -85,7 +88,7 @@ 
#define FUSE_KERNEL_VERSION 7



/** Minor version number of this interface */

#define FUSE_KERNEL_MINOR_VERSION 18

#define FUSE_KERNEL_MINOR_VERSION 19



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

#define FUSE_ROOT_ID 1
@@ -278,6 +281,7 @@ enum fuse_opcode { 
	FUSE_POLL          = 40,

	FUSE_NOTIFY_REPLY  = 41,

	FUSE_BATCH_FORGET  = 42,

	FUSE_FALLOCATE     = 43,



	/* CUSE specific operations */

	CUSE_INIT          = 4096,
@@ -571,6 +575,14 @@ struct fuse_notify_poll_wakeup_out { 
	__u64	kh;

};



struct fuse_fallocate_in {

	__u64	fh;

	__u64	offset;

	__u64	length;

	__u32	mode;

	__u32	padding;

};



struct fuse_in_header {

	__u32	len;

	__u32	opcode;