tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_trans.h"
15#include "xfs_trans_priv.h"
16#include "xfs_inode_item.h"
17#include "xfs_trace.h"
18
19#include <linux/iversion.h>
20
21/*
22 * Add a locked inode to the transaction.
23 *
24 * The inode must be locked, and it cannot be associated with any transaction.
25 * If lock_flags is non-zero the inode will be unlocked on transaction commit.
26 */
27void
28xfs_trans_ijoin(
29 struct xfs_trans *tp,
30 struct xfs_inode *ip,
31 uint lock_flags)
32{
33 xfs_inode_log_item_t *iip;
34
35 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
36 if (ip->i_itemp == NULL)
37 xfs_inode_item_init(ip, ip->i_mount);
38 iip = ip->i_itemp;
39
40 ASSERT(iip->ili_lock_flags == 0);
41 iip->ili_lock_flags = lock_flags;
42
43 /*
44 * Get a log_item_desc to point at the new item.
45 */
46 xfs_trans_add_item(tp, &iip->ili_item);
47}
48
49/*
50 * Transactional inode timestamp update. Requires the inode to be locked and
51 * joined to the transaction supplied. Relies on the transaction subsystem to
52 * track dirty state and update/writeback the inode accordingly.
53 */
54void
55xfs_trans_ichgtime(
56 struct xfs_trans *tp,
57 struct xfs_inode *ip,
58 int flags)
59{
60 struct inode *inode = VFS_I(ip);
61 struct timespec64 tv;
62
63 ASSERT(tp);
64 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
65
66 tv = current_time(inode);
67
68 if (flags & XFS_ICHGTIME_MOD)
69 inode->i_mtime = tv;
70 if (flags & XFS_ICHGTIME_CHG)
71 inode->i_ctime = tv;
72}
73
74/*
75 * This is called to mark the fields indicated in fieldmask as needing
76 * to be logged when the transaction is committed. The inode must
77 * already be associated with the given transaction.
78 *
79 * The values for fieldmask are defined in xfs_inode_item.h. We always
80 * log all of the core inode if any of it has changed, and we always log
81 * all of the inline data/extents/b-tree root if any of them has changed.
82 */
83void
84xfs_trans_log_inode(
85 xfs_trans_t *tp,
86 xfs_inode_t *ip,
87 uint flags)
88{
89 struct inode *inode = VFS_I(ip);
90
91 ASSERT(ip->i_itemp != NULL);
92 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
93
94 /*
95 * Don't bother with i_lock for the I_DIRTY_TIME check here, as races
96 * don't matter - we either will need an extra transaction in 24 hours
97 * to log the timestamps, or will clear already cleared fields in the
98 * worst case.
99 */
100 if (inode->i_state & (I_DIRTY_TIME | I_DIRTY_TIME_EXPIRED)) {
101 spin_lock(&inode->i_lock);
102 inode->i_state &= ~(I_DIRTY_TIME | I_DIRTY_TIME_EXPIRED);
103 spin_unlock(&inode->i_lock);
104 }
105
106 /*
107 * Record the specific change for fdatasync optimisation. This
108 * allows fdatasync to skip log forces for inodes that are only
109 * timestamp dirty. We do this before the change count so that
110 * the core being logged in this case does not impact on fdatasync
111 * behaviour.
112 */
113 ip->i_itemp->ili_fsync_fields |= flags;
114
115 /*
116 * First time we log the inode in a transaction, bump the inode change
117 * counter if it is configured for this to occur. While we have the
118 * inode locked exclusively for metadata modification, we can usually
119 * avoid setting XFS_ILOG_CORE if no one has queried the value since
120 * the last time it was incremented. If we have XFS_ILOG_CORE already
121 * set however, then go ahead and bump the i_version counter
122 * unconditionally.
123 */
124 if (!test_and_set_bit(XFS_LI_DIRTY, &ip->i_itemp->ili_item.li_flags) &&
125 IS_I_VERSION(VFS_I(ip))) {
126 if (inode_maybe_inc_iversion(VFS_I(ip), flags & XFS_ILOG_CORE))
127 flags |= XFS_ILOG_CORE;
128 }
129
130 tp->t_flags |= XFS_TRANS_DIRTY;
131
132 /*
133 * Always OR in the bits from the ili_last_fields field.
134 * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
135 * routines in the eventual clearing of the ili_fields bits.
136 * See the big comment in xfs_iflush() for an explanation of
137 * this coordination mechanism.
138 */
139 flags |= ip->i_itemp->ili_last_fields;
140 ip->i_itemp->ili_fields |= flags;
141}
142
143int
144xfs_trans_roll_inode(
145 struct xfs_trans **tpp,
146 struct xfs_inode *ip)
147{
148 int error;
149
150 xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
151 error = xfs_trans_roll(tpp);
152 if (!error)
153 xfs_trans_ijoin(*tpp, ip, 0);
154 return error;
155}