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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#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_inode.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_inode_item.h"
#include <linux/iversion.h>
/*
* Add a locked inode to the transaction.
*
* The inode must be locked, and it cannot be associated with any transaction.
* If lock_flags is non-zero the inode will be unlocked on transaction commit.
*/
void
xfs_trans_ijoin(
struct xfs_trans *tp,
struct xfs_inode *ip,
uint lock_flags)
{
struct xfs_inode_log_item *iip;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (ip->i_itemp == NULL)
xfs_inode_item_init(ip, ip->i_mount);
iip = ip->i_itemp;
ASSERT(iip->ili_lock_flags == 0);
iip->ili_lock_flags = lock_flags;
ASSERT(!xfs_iflags_test(ip, XFS_ISTALE));
/*
* Get a log_item_desc to point at the new item.
*/
xfs_trans_add_item(tp, &iip->ili_item);
}
/*
* Transactional inode timestamp update. Requires the inode to be locked and
* joined to the transaction supplied. Relies on the transaction subsystem to
* track dirty state and update/writeback the inode accordingly.
*/
void
xfs_trans_ichgtime(
struct xfs_trans *tp,
struct xfs_inode *ip,
int flags)
{
struct inode *inode = VFS_I(ip);
struct timespec64 tv;
ASSERT(tp);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
tv = current_time(inode);
if (flags & XFS_ICHGTIME_MOD)
inode->i_mtime = tv;
if (flags & XFS_ICHGTIME_CHG)
inode->i_ctime = tv;
if (flags & XFS_ICHGTIME_CREATE)
ip->i_d.di_crtime = tv;
}
/*
* This is called to mark the fields indicated in fieldmask as needing to be
* logged when the transaction is committed. The inode must already be
* associated with the given transaction.
*
* The values for fieldmask are defined in xfs_inode_item.h. We always log all
* of the core inode if any of it has changed, and we always log all of the
* inline data/extents/b-tree root if any of them has changed.
*
* Grab and pin the cluster buffer associated with this inode to avoid RMW
* cycles at inode writeback time. Avoid the need to add error handling to every
* xfs_trans_log_inode() call by shutting down on read error. This will cause
* transactions to fail and everything to error out, just like if we return a
* read error in a dirty transaction and cancel it.
*/
void
xfs_trans_log_inode(
struct xfs_trans *tp,
struct xfs_inode *ip,
uint flags)
{
struct xfs_inode_log_item *iip = ip->i_itemp;
struct inode *inode = VFS_I(ip);
uint iversion_flags = 0;
ASSERT(iip);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(!xfs_iflags_test(ip, XFS_ISTALE));
tp->t_flags |= XFS_TRANS_DIRTY;
/*
* Don't bother with i_lock for the I_DIRTY_TIME check here, as races
* don't matter - we either will need an extra transaction in 24 hours
* to log the timestamps, or will clear already cleared fields in the
* worst case.
*/
if (inode->i_state & I_DIRTY_TIME) {
spin_lock(&inode->i_lock);
inode->i_state &= ~I_DIRTY_TIME;
spin_unlock(&inode->i_lock);
}
/*
* First time we log the inode in a transaction, bump the inode change
* counter if it is configured for this to occur. While we have the
* inode locked exclusively for metadata modification, we can usually
* avoid setting XFS_ILOG_CORE if no one has queried the value since
* the last time it was incremented. If we have XFS_ILOG_CORE already
* set however, then go ahead and bump the i_version counter
* unconditionally.
*/
if (!test_and_set_bit(XFS_LI_DIRTY, &iip->ili_item.li_flags)) {
if (IS_I_VERSION(inode) &&
inode_maybe_inc_iversion(inode, flags & XFS_ILOG_CORE))
iversion_flags = XFS_ILOG_CORE;
}
/*
* Record the specific change for fdatasync optimisation. This allows
* fdatasync to skip log forces for inodes that are only timestamp
* dirty.
*/
spin_lock(&iip->ili_lock);
iip->ili_fsync_fields |= flags;
if (!iip->ili_item.li_buf) {
struct xfs_buf *bp;
int error;
/*
* We hold the ILOCK here, so this inode is not going to be
* flushed while we are here. Further, because there is no
* buffer attached to the item, we know that there is no IO in
* progress, so nothing will clear the ili_fields while we read
* in the buffer. Hence we can safely drop the spin lock and
* read the buffer knowing that the state will not change from
* here.
*/
spin_unlock(&iip->ili_lock);
error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, NULL,
&bp, 0);
if (error) {
xfs_force_shutdown(ip->i_mount, SHUTDOWN_META_IO_ERROR);
return;
}
/*
* We need an explicit buffer reference for the log item but
* don't want the buffer to remain attached to the transaction.
* Hold the buffer but release the transaction reference once
* we've attached the inode log item to the buffer log item
* list.
*/
xfs_buf_hold(bp);
spin_lock(&iip->ili_lock);
iip->ili_item.li_buf = bp;
bp->b_flags |= _XBF_INODES;
list_add_tail(&iip->ili_item.li_bio_list, &bp->b_li_list);
xfs_trans_brelse(tp, bp);
}
/*
* Always OR in the bits from the ili_last_fields field. This is to
* coordinate with the xfs_iflush() and xfs_iflush_done() routines in
* the eventual clearing of the ili_fields bits. See the big comment in
* xfs_iflush() for an explanation of this coordination mechanism.
*/
iip->ili_fields |= (flags | iip->ili_last_fields | iversion_flags);
spin_unlock(&iip->ili_lock);
}
int
xfs_trans_roll_inode(
struct xfs_trans **tpp,
struct xfs_inode *ip)
{
int error;
xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
error = xfs_trans_roll(tpp);
if (!error)
xfs_trans_ijoin(*tpp, ip, 0);
return error;
}
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