1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2022 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_swapext.h"
#include "xfs_xchgrange.h"
/* Lock (and optionally join) two inodes for a file range exchange. */
void
xfs_xchg_range_ilock(
struct xfs_trans *tp,
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
if (ip1 != ip2)
xfs_lock_two_inodes(ip1, XFS_ILOCK_EXCL,
ip2, XFS_ILOCK_EXCL);
else
xfs_ilock(ip1, XFS_ILOCK_EXCL);
if (tp) {
xfs_trans_ijoin(tp, ip1, 0);
if (ip2 != ip1)
xfs_trans_ijoin(tp, ip2, 0);
}
}
/* Unlock two inodes after a file range exchange operation. */
void
xfs_xchg_range_iunlock(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
if (ip2 != ip1)
xfs_iunlock(ip2, XFS_ILOCK_EXCL);
xfs_iunlock(ip1, XFS_ILOCK_EXCL);
}
/*
* Estimate the resource requirements to exchange file contents between the two
* files. The caller is required to hold the IOLOCK and the MMAPLOCK and to
* have flushed both inodes' pagecache and active direct-ios.
*/
int
xfs_xchg_range_estimate(
struct xfs_swapext_req *req)
{
int error;
xfs_xchg_range_ilock(NULL, req->ip1, req->ip2);
error = xfs_swapext_estimate(req);
xfs_xchg_range_iunlock(req->ip1, req->ip2);
return error;
}
|
