fs/xfs/libxfs/xfs_trans_inode.c - third_party/kernel - Git at Google

 // 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_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;
 	}

 	/*
 	 * If we're updating the inode core or the timestamps and it's possible
 	 * to upgrade this inode to bigtime format, do so now.
 	 */
 	if ((flags & (XFS_ILOG_CORE | XFS_ILOG_TIMESTAMP)) &&
 	    xfs_has_bigtime(ip->i_mount) &&
 	    !xfs_inode_has_bigtime(ip)) {
 		ip->i_diflags2 |= XFS_DIFLAG2_BIGTIME;
 		flags |= XFS_ILOG_CORE;
 	}

 	/*
 	 * Inode verifiers do not check that the extent size hint is an integer
 	 * multiple of the rt extent size on a directory with both rtinherit
 	 * and extszinherit flags set.  If we're logging a directory that is
 	 * misconfigured in this way, clear the hint.
 	 */
 	if ((ip->i_diflags & XFS_DIFLAG_RTINHERIT) &&
 	    (ip->i_diflags & XFS_DIFLAG_EXTSZINHERIT) &&
 	    (ip->i_extsize % ip->i_mount->m_sb.sb_rextsize) > 0) {
 		ip->i_diflags &= ~(XFS_DIFLAG_EXTSIZE |
 				   XFS_DIFLAG_EXTSZINHERIT);
 		ip->i_extsize = 0;
 		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, &bp);
 		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_buf_inode_iodone() 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;
 }
	// 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_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;
	}

	/*
	* If we're updating the inode core or the timestamps and it's possible
	* to upgrade this inode to bigtime format, do so now.
	*/
	if ((flags & (XFS_ILOG_CORE \| XFS_ILOG_TIMESTAMP)) &&
	xfs_has_bigtime(ip->i_mount) &&
	!xfs_inode_has_bigtime(ip)) {
	ip->i_diflags2 \|= XFS_DIFLAG2_BIGTIME;
	flags \|= XFS_ILOG_CORE;
	}

	/*
	* Inode verifiers do not check that the extent size hint is an integer
	* multiple of the rt extent size on a directory with both rtinherit
	* and extszinherit flags set. If we're logging a directory that is
	* misconfigured in this way, clear the hint.
	*/
	if ((ip->i_diflags & XFS_DIFLAG_RTINHERIT) &&
	(ip->i_diflags & XFS_DIFLAG_EXTSZINHERIT) &&
	(ip->i_extsize % ip->i_mount->m_sb.sb_rextsize) > 0) {
	ip->i_diflags &= ~(XFS_DIFLAG_EXTSIZE \|
	XFS_DIFLAG_EXTSZINHERIT);
	ip->i_extsize = 0;
	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, &bp);
	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_buf_inode_iodone() 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;
	}