mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-11-17 10:01:01 +03:00
6dccdf501e
On Linux the ioctl_ficlonerange() and ioctl_ficlone() system calls are expected to either fully clone the specified range or return an error. The range may be for an entire file. While internally ZFS supports cloning partial ranges there's no way to return the length cloned to the caller so we need to make this all or nothing. As part of this change support for the REMAP_FILE_CAN_SHORTEN flag has been added. When REMAP_FILE_CAN_SHORTEN is set zfs_clone_range() will return a shortened range when encountering pending dirty records. When it's clear zfs_clone_range() will block and wait for the records to be written out allowing the blocks to be cloned. Furthermore, the file range lock is held over the region being cloned to prevent it from being modified while cloning. This doesn't quite provide an atomic semantics since if an error is encountered only a portion of the range may be cloned. This will be converted to an error if REMAP_FILE_CAN_SHORTEN was not provided and returned to the caller. However, the destination file range is left in an undefined state. A test case has been added which exercises this functionality by verifying that `cp --reflink=never|auto|always` works correctly. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #15728 Closes #15842
63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License (the "License").
|
|
* You may not use this file except in compliance with the License.
|
|
*
|
|
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
* or https://opensource.org/licenses/CDDL-1.0.
|
|
* See the License for the specific language governing permissions
|
|
* and limitations under the License.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
* If applicable, add the following below this CDDL HEADER, with the
|
|
* fields enclosed by brackets "[]" replaced with your own identifying
|
|
* information: Portions Copyright [yyyy] [name of copyright owner]
|
|
*
|
|
* CDDL HEADER END
|
|
*/
|
|
/*
|
|
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
|
|
*/
|
|
|
|
#ifndef _SYS_FS_ZFS_VNOPS_H
|
|
#define _SYS_FS_ZFS_VNOPS_H
|
|
|
|
#include <sys/zfs_vnops_os.h>
|
|
|
|
extern int zfs_bclone_enabled;
|
|
|
|
extern int zfs_fsync(znode_t *, int, cred_t *);
|
|
extern int zfs_read(znode_t *, zfs_uio_t *, int, cred_t *);
|
|
extern int zfs_write(znode_t *, zfs_uio_t *, int, cred_t *);
|
|
extern int zfs_holey(znode_t *, ulong_t, loff_t *);
|
|
extern int zfs_access(znode_t *, int, int, cred_t *);
|
|
extern int zfs_clone_range(znode_t *, uint64_t *, znode_t *, uint64_t *,
|
|
uint64_t *, cred_t *);
|
|
extern int zfs_clone_range_replay(znode_t *, uint64_t, uint64_t, uint64_t,
|
|
const blkptr_t *, size_t);
|
|
|
|
extern int zfs_getsecattr(znode_t *, vsecattr_t *, int, cred_t *);
|
|
extern int zfs_setsecattr(znode_t *, vsecattr_t *, int, cred_t *);
|
|
|
|
extern int mappedread(znode_t *, int, zfs_uio_t *);
|
|
extern int mappedread_sf(znode_t *, int, zfs_uio_t *);
|
|
extern void update_pages(znode_t *, int64_t, int, objset_t *);
|
|
|
|
/*
|
|
* Platform code that asynchronously drops zp's inode / vnode_t.
|
|
*
|
|
* Asynchronous dropping ensures that the caller will never drop the
|
|
* last reference on an inode / vnode_t in the current context.
|
|
* Doing so while holding open a tx could result in a deadlock if
|
|
* the platform calls into filesystem again in the implementation
|
|
* of inode / vnode_t dropping (e.g. call from iput_final()).
|
|
*/
|
|
extern void zfs_zrele_async(znode_t *zp);
|
|
|
|
extern zil_get_data_t zfs_get_data;
|
|
|
|
#endif
|