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
 18#include <linux/iversion.h>
 19
 20/*
 21 * Add a locked inode to the transaction.
 22 *
 23 * The inode must be locked, and it cannot be associated with any transaction.
 24 * If lock_flags is non-zero the inode will be unlocked on transaction commit.
 25 */
 26void
 27xfs_trans_ijoin(
 28	struct xfs_trans	*tp,
 29	struct xfs_inode	*ip,
 30	uint			lock_flags)
 31{
 32	struct xfs_inode_log_item *iip;
 33
 34	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 35	if (ip->i_itemp == NULL)
 36		xfs_inode_item_init(ip, ip->i_mount);
 37	iip = ip->i_itemp;
 38
 39	ASSERT(iip->ili_lock_flags == 0);
 40	iip->ili_lock_flags = lock_flags;
 41	ASSERT(!xfs_iflags_test(ip, XFS_ISTALE));
 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	if (flags & XFS_ICHGTIME_CREATE)
 73		ip->i_d.di_crtime = tv;
 74}
 75
 76/*
 77 * This is called to mark the fields indicated in fieldmask as needing to be
 78 * logged when the transaction is committed.  The inode must already be
 79 * associated with the given transaction.
 80 *
 81 * The values for fieldmask are defined in xfs_inode_item.h.  We always log all
 82 * of the core inode if any of it has changed, and we always log all of the
 83 * inline data/extents/b-tree root if any of them has changed.
 84 *
 85 * Grab and pin the cluster buffer associated with this inode to avoid RMW
 86 * cycles at inode writeback time. Avoid the need to add error handling to every
 87 * xfs_trans_log_inode() call by shutting down on read error.  This will cause
 88 * transactions to fail and everything to error out, just like if we return a
 89 * read error in a dirty transaction and cancel it.
 90 */
 91void
 92xfs_trans_log_inode(
 93	struct xfs_trans	*tp,
 94	struct xfs_inode	*ip,
 95	uint			flags)
 96{
 97	struct xfs_inode_log_item *iip = ip->i_itemp;
 98	struct inode		*inode = VFS_I(ip);
 99	uint			iversion_flags = 0;
100
101	ASSERT(iip);
102	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
103	ASSERT(!xfs_iflags_test(ip, XFS_ISTALE));
104
105	tp->t_flags |= XFS_TRANS_DIRTY;
106
107	/*
108	 * Don't bother with i_lock for the I_DIRTY_TIME check here, as races
109	 * don't matter - we either will need an extra transaction in 24 hours
110	 * to log the timestamps, or will clear already cleared fields in the
111	 * worst case.
112	 */
113	if (inode->i_state & I_DIRTY_TIME) {
114		spin_lock(&inode->i_lock);
115		inode->i_state &= ~I_DIRTY_TIME;
116		spin_unlock(&inode->i_lock);
117	}
118
119	/*
120	 * First time we log the inode in a transaction, bump the inode change
121	 * counter if it is configured for this to occur. While we have the
122	 * inode locked exclusively for metadata modification, we can usually
123	 * avoid setting XFS_ILOG_CORE if no one has queried the value since
124	 * the last time it was incremented. If we have XFS_ILOG_CORE already
125	 * set however, then go ahead and bump the i_version counter
126	 * unconditionally.
127	 */
128	if (!test_and_set_bit(XFS_LI_DIRTY, &iip->ili_item.li_flags)) {
129		if (IS_I_VERSION(inode) &&
130		    inode_maybe_inc_iversion(inode, flags & XFS_ILOG_CORE))
131			iversion_flags = XFS_ILOG_CORE;
132	}
133
134	/*
135	 * Record the specific change for fdatasync optimisation. This allows
136	 * fdatasync to skip log forces for inodes that are only timestamp
137	 * dirty.
138	 */
139	spin_lock(&iip->ili_lock);
140	iip->ili_fsync_fields |= flags;
141
142	if (!iip->ili_item.li_buf) {
143		struct xfs_buf	*bp;
144		int		error;
145
146		/*
147		 * We hold the ILOCK here, so this inode is not going to be
148		 * flushed while we are here. Further, because there is no
149		 * buffer attached to the item, we know that there is no IO in
150		 * progress, so nothing will clear the ili_fields while we read
151		 * in the buffer. Hence we can safely drop the spin lock and
152		 * read the buffer knowing that the state will not change from
153		 * here.
154		 */
155		spin_unlock(&iip->ili_lock);
156		error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, NULL,
157					&bp, 0);
158		if (error) {
159			xfs_force_shutdown(ip->i_mount, SHUTDOWN_META_IO_ERROR);
160			return;
161		}
162
163		/*
164		 * We need an explicit buffer reference for the log item but
165		 * don't want the buffer to remain attached to the transaction.
166		 * Hold the buffer but release the transaction reference once
167		 * we've attached the inode log item to the buffer log item
168		 * list.
169		 */
170		xfs_buf_hold(bp);
171		spin_lock(&iip->ili_lock);
172		iip->ili_item.li_buf = bp;
173		bp->b_flags |= _XBF_INODES;
174		list_add_tail(&iip->ili_item.li_bio_list, &bp->b_li_list);
175		xfs_trans_brelse(tp, bp);
176	}
177
178	/*
179	 * Always OR in the bits from the ili_last_fields field.  This is to
180	 * coordinate with the xfs_iflush() and xfs_iflush_done() routines in
181	 * the eventual clearing of the ili_fields bits.  See the big comment in
182	 * xfs_iflush() for an explanation of this coordination mechanism.
183	 */
184	iip->ili_fields |= (flags | iip->ili_last_fields | iversion_flags);
185	spin_unlock(&iip->ili_lock);
186}
187
188int
189xfs_trans_roll_inode(
190	struct xfs_trans	**tpp,
191	struct xfs_inode	*ip)
192{
193	int			error;
194
195	xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
196	error = xfs_trans_roll(tpp);
197	if (!error)
198		xfs_trans_ijoin(*tpp, ip, 0);
199	return error;
200}