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 */
27 void
xfs_trans_ijoin(struct xfs_trans * tp,struct xfs_inode * ip,uint lock_flags)28 xfs_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 ASSERT(!xfs_iflags_test(ip, XFS_ISTALE));
43
44 /*
45 * Get a log_item_desc to point at the new item.
46 */
47 xfs_trans_add_item(tp, &iip->ili_item);
48 }
49
50 /*
51 * Transactional inode timestamp update. Requires the inode to be locked and
52 * joined to the transaction supplied. Relies on the transaction subsystem to
53 * track dirty state and update/writeback the inode accordingly.
54 */
55 void
xfs_trans_ichgtime(struct xfs_trans * tp,struct xfs_inode * ip,int flags)56 xfs_trans_ichgtime(
57 struct xfs_trans *tp,
58 struct xfs_inode *ip,
59 int flags)
60 {
61 struct inode *inode = VFS_I(ip);
62 struct timespec64 tv;
63
64 ASSERT(tp);
65 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
66
67 tv = current_time(inode);
68
69 if (flags & XFS_ICHGTIME_MOD)
70 inode->i_mtime = tv;
71 if (flags & XFS_ICHGTIME_CHG)
72 inode->i_ctime = tv;
73 }
74
75 /*
76 * This is called to mark the fields indicated in fieldmask as needing
77 * to be logged when the transaction is committed. The inode must
78 * already be associated with the given transaction.
79 *
80 * The values for fieldmask are defined in xfs_inode_item.h. We always
81 * log all of the core inode if any of it has changed, and we always log
82 * all of the inline data/extents/b-tree root if any of them has changed.
83 */
84 void
xfs_trans_log_inode(xfs_trans_t * tp,xfs_inode_t * ip,uint flags)85 xfs_trans_log_inode(
86 xfs_trans_t *tp,
87 xfs_inode_t *ip,
88 uint flags)
89 {
90 struct inode *inode = VFS_I(ip);
91
92 ASSERT(ip->i_itemp != NULL);
93 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
94 ASSERT(!xfs_iflags_test(ip, XFS_ISTALE));
95
96 /*
97 * Don't bother with i_lock for the I_DIRTY_TIME check here, as races
98 * don't matter - we either will need an extra transaction in 24 hours
99 * to log the timestamps, or will clear already cleared fields in the
100 * worst case.
101 */
102 if (inode->i_state & I_DIRTY_TIME) {
103 spin_lock(&inode->i_lock);
104 inode->i_state &= ~I_DIRTY_TIME;
105 spin_unlock(&inode->i_lock);
106 }
107
108 /*
109 * Record the specific change for fdatasync optimisation. This
110 * allows fdatasync to skip log forces for inodes that are only
111 * timestamp dirty. We do this before the change count so that
112 * the core being logged in this case does not impact on fdatasync
113 * behaviour.
114 */
115 ip->i_itemp->ili_fsync_fields |= flags;
116
117 /*
118 * First time we log the inode in a transaction, bump the inode change
119 * counter if it is configured for this to occur. While we have the
120 * inode locked exclusively for metadata modification, we can usually
121 * avoid setting XFS_ILOG_CORE if no one has queried the value since
122 * the last time it was incremented. If we have XFS_ILOG_CORE already
123 * set however, then go ahead and bump the i_version counter
124 * unconditionally.
125 */
126 if (!test_and_set_bit(XFS_LI_DIRTY, &ip->i_itemp->ili_item.li_flags) &&
127 IS_I_VERSION(VFS_I(ip))) {
128 if (inode_maybe_inc_iversion(VFS_I(ip), flags & XFS_ILOG_CORE))
129 flags |= XFS_ILOG_CORE;
130 }
131
132 tp->t_flags |= XFS_TRANS_DIRTY;
133
134 /*
135 * Always OR in the bits from the ili_last_fields field.
136 * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
137 * routines in the eventual clearing of the ili_fields bits.
138 * See the big comment in xfs_iflush() for an explanation of
139 * this coordination mechanism.
140 */
141 flags |= ip->i_itemp->ili_last_fields;
142 ip->i_itemp->ili_fields |= flags;
143 }
144
145 int
xfs_trans_roll_inode(struct xfs_trans ** tpp,struct xfs_inode * ip)146 xfs_trans_roll_inode(
147 struct xfs_trans **tpp,
148 struct xfs_inode *ip)
149 {
150 int error;
151
152 xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
153 error = xfs_trans_roll(tpp);
154 if (!error)
155 xfs_trans_ijoin(*tpp, ip, 0);
156 return error;
157 }
158