1/*
  2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
  3 * All Rights Reserved.
  4 *
  5 * This program is free software; you can redistribute it and/or
  6 * modify it under the terms of the GNU General Public License as
  7 * published by the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it would be useful,
 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12 * GNU General Public License for more details.
 13 *
 14 * You should have received a copy of the GNU General Public License
 15 * along with this program; if not, write the Free Software Foundation,
 16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17 */
 18#include "xfs.h"
 19#include "xfs_fs.h"
 20#include "xfs_shared.h"
 21#include "xfs_format.h"
 22#include "xfs_log_format.h"
 23#include "xfs_trans_resv.h"
 24#include "xfs_mount.h"
 25#include "xfs_inode.h"
 26#include "xfs_trans.h"
 27#include "xfs_trans_priv.h"
 28#include "xfs_inode_item.h"
 29#include "xfs_trace.h"
 30
 31#include <linux/iversion.h>
 32
 33/*
 34 * Add a locked inode to the transaction.
 35 *
 36 * The inode must be locked, and it cannot be associated with any transaction.
 37 * If lock_flags is non-zero the inode will be unlocked on transaction commit.
 38 */
 39void
 40xfs_trans_ijoin(
 41	struct xfs_trans	*tp,
 42	struct xfs_inode	*ip,
 43	uint			lock_flags)
 44{
 45	xfs_inode_log_item_t	*iip;
 46
 47	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 48	if (ip->i_itemp == NULL)
 49		xfs_inode_item_init(ip, ip->i_mount);
 50	iip = ip->i_itemp;
 51
 52	ASSERT(iip->ili_lock_flags == 0);
 53	iip->ili_lock_flags = lock_flags;
 54
 55	/*
 56	 * Get a log_item_desc to point at the new item.
 57	 */
 58	xfs_trans_add_item(tp, &iip->ili_item);
 59}
 60
 61/*
 62 * Transactional inode timestamp update. Requires the inode to be locked and
 63 * joined to the transaction supplied. Relies on the transaction subsystem to
 64 * track dirty state and update/writeback the inode accordingly.
 65 */
 66void
 67xfs_trans_ichgtime(
 68	struct xfs_trans	*tp,
 69	struct xfs_inode	*ip,
 70	int			flags)
 71{
 72	struct inode		*inode = VFS_I(ip);
 73	struct timespec		tv;
 74
 75	ASSERT(tp);
 76	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 77
 78	tv = current_time(inode);
 79
 80	if (flags & XFS_ICHGTIME_MOD)
 81		inode->i_mtime = tv;
 82	if (flags & XFS_ICHGTIME_CHG)
 83		inode->i_ctime = tv;
 84}
 85
 86/*
 87 * This is called to mark the fields indicated in fieldmask as needing
 88 * to be logged when the transaction is committed.  The inode must
 89 * already be associated with the given transaction.
 90 *
 91 * The values for fieldmask are defined in xfs_inode_item.h.  We always
 92 * log all of the core inode if any of it has changed, and we always log
 93 * all of the inline data/extents/b-tree root if any of them has changed.
 94 */
 95void
 96xfs_trans_log_inode(
 97	xfs_trans_t	*tp,
 98	xfs_inode_t	*ip,
 99	uint		flags)
100{
101	struct inode	*inode = VFS_I(ip);
102
103	ASSERT(ip->i_itemp != NULL);
104	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
105
106	/*
107	 * Don't bother with i_lock for the I_DIRTY_TIME check here, as races
108	 * don't matter - we either will need an extra transaction in 24 hours
109	 * to log the timestamps, or will clear already cleared fields in the
110	 * worst case.
111	 */
112	if (inode->i_state & (I_DIRTY_TIME | I_DIRTY_TIME_EXPIRED)) {
113		spin_lock(&inode->i_lock);
114		inode->i_state &= ~(I_DIRTY_TIME | I_DIRTY_TIME_EXPIRED);
115		spin_unlock(&inode->i_lock);
116	}
117
118	/*
119	 * Record the specific change for fdatasync optimisation. This
120	 * allows fdatasync to skip log forces for inodes that are only
121	 * timestamp dirty. We do this before the change count so that
122	 * the core being logged in this case does not impact on fdatasync
123	 * behaviour.
124	 */
125	ip->i_itemp->ili_fsync_fields |= flags;
126
127	/*
128	 * First time we log the inode in a transaction, bump the inode change
129	 * counter if it is configured for this to occur. While we have the
130	 * inode locked exclusively for metadata modification, we can usually
131	 * avoid setting XFS_ILOG_CORE if no one has queried the value since
132	 * the last time it was incremented. If we have XFS_ILOG_CORE already
133	 * set however, then go ahead and bump the i_version counter
134	 * unconditionally.
135	 */
136	if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
137	    IS_I_VERSION(VFS_I(ip))) {
138		if (inode_maybe_inc_iversion(VFS_I(ip), flags & XFS_ILOG_CORE))
139			flags |= XFS_ILOG_CORE;
140	}
141
142	tp->t_flags |= XFS_TRANS_DIRTY;
143	ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;
144
145	/*
146	 * Always OR in the bits from the ili_last_fields field.
147	 * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
148	 * routines in the eventual clearing of the ili_fields bits.
149	 * See the big comment in xfs_iflush() for an explanation of
150	 * this coordination mechanism.
151	 */
152	flags |= ip->i_itemp->ili_last_fields;
153	ip->i_itemp->ili_fields |= flags;
154}
155
156int
157xfs_trans_roll_inode(
158	struct xfs_trans	**tpp,
159	struct xfs_inode	*ip)
160{
161	int			error;
162
163	xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
164	error = xfs_trans_roll(tpp);
165	if (!error)
166		xfs_trans_ijoin(*tpp, ip, 0);
167	return error;
168}