LXR linux/fs/xfs/libxfs/xfs_trans

   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_inode.h"
  12#include "xfs_trans.h"
  13#include "xfs_trans_priv.h"
  14#include "xfs_inode_item.h"
  15
  16#include <linux/iversion.h>
  17
  18/*
  19 * Add a locked inode to the transaction.
  20 *
  21 * The inode must be locked, and it cannot be associated with any transaction.
  22 * If lock_flags is non-zero the inode will be unlocked on transaction commit.
  23 */
  24void
  25xfs_trans_ijoin(
  26        struct xfs_trans        *tp,
  27        struct xfs_inode        *ip,
  28        uint                    lock_flags)
  29{
  30        xfs_inode_log_item_t    *iip;
  31
  32        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  33        if (ip->i_itemp == NULL)
  34                xfs_inode_item_init(ip, ip->i_mount);
  35        iip = ip->i_itemp;
  36
  37        ASSERT(iip->ili_lock_flags == 0);
  38        iip->ili_lock_flags = lock_flags;
  39
  40        /*
  41         * Get a log_item_desc to point at the new item.
  42         */
  43        xfs_trans_add_item(tp, &iip->ili_item);
  44}
  45
  46/*
  47 * Transactional inode timestamp update. Requires the inode to be locked and
  48 * joined to the transaction supplied. Relies on the transaction subsystem to
  49 * track dirty state and update/writeback the inode accordingly.
  50 */
  51void
  52xfs_trans_ichgtime(
  53        struct xfs_trans        *tp,
  54        struct xfs_inode        *ip,
  55        int                     flags)
  56{
  57        struct inode            *inode = VFS_I(ip);
  58        struct timespec64       tv;
  59
  60        ASSERT(tp);
  61        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  62
  63        tv = current_time(inode);
  64
  65        if (flags & XFS_ICHGTIME_MOD)
  66                inode->i_mtime = tv;
  67        if (flags & XFS_ICHGTIME_CHG)
  68                inode->i_ctime = tv;
  69        if (flags & XFS_ICHGTIME_CREATE)
  70                ip->i_d.di_crtime = tv;
  71}
  72
  73/*
  74 * This is called to mark the fields indicated in fieldmask as needing
  75 * to be logged when the transaction is committed.  The inode must
  76 * already be associated with the given transaction.
  77 *
  78 * The values for fieldmask are defined in xfs_inode_item.h.  We always
  79 * log all of the core inode if any of it has changed, and we always log
  80 * all of the inline data/extents/b-tree root if any of them has changed.
  81 */
  82void
  83xfs_trans_log_inode(
  84        xfs_trans_t     *tp,
  85        xfs_inode_t     *ip,
  86        uint            flags)
  87{
  88        struct inode    *inode = VFS_I(ip);
  89
  90        ASSERT(ip->i_itemp != NULL);
  91        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  92
  93        /*
  94         * Don't bother with i_lock for the I_DIRTY_TIME check here, as races
  95         * don't matter - we either will need an extra transaction in 24 hours
  96         * to log the timestamps, or will clear already cleared fields in the
  97         * worst case.
  98         */
  99        if (inode->i_state & I_DIRTY_TIME) {
 100                spin_lock(&inode->i_lock);
 101                inode->i_state &= ~I_DIRTY_TIME;
 102                spin_unlock(&inode->i_lock);
 103        }
 104
 105        /*
 106         * Record the specific change for fdatasync optimisation. This
 107         * allows fdatasync to skip log forces for inodes that are only
 108         * timestamp dirty. We do this before the change count so that
 109         * the core being logged in this case does not impact on fdatasync
 110         * behaviour.
 111         */
 112        ip->i_itemp->ili_fsync_fields |= flags;
 113
 114        /*
 115         * First time we log the inode in a transaction, bump the inode change
 116         * counter if it is configured for this to occur. While we have the
 117         * inode locked exclusively for metadata modification, we can usually
 118         * avoid setting XFS_ILOG_CORE if no one has queried the value since
 119         * the last time it was incremented. If we have XFS_ILOG_CORE already
 120         * set however, then go ahead and bump the i_version counter
 121         * unconditionally.
 122         */
 123        if (!test_and_set_bit(XFS_LI_DIRTY, &ip->i_itemp->ili_item.li_flags) &&
 124            IS_I_VERSION(VFS_I(ip))) {
 125                if (inode_maybe_inc_iversion(VFS_I(ip), flags & XFS_ILOG_CORE))
 126                        flags |= XFS_ILOG_CORE;
 127        }
 128
 129        tp->t_flags |= XFS_TRANS_DIRTY;
 130
 131        /*
 132         * Always OR in the bits from the ili_last_fields field.
 133         * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 134         * routines in the eventual clearing of the ili_fields bits.
 135         * See the big comment in xfs_iflush() for an explanation of
 136         * this coordination mechanism.
 137         */
 138        flags |= ip->i_itemp->ili_last_fields;
 139        ip->i_itemp->ili_fields |= flags;
 140}
 141
 142int
 143xfs_trans_roll_inode(
 144        struct xfs_trans        **tpp,
 145        struct xfs_inode        *ip)
 146{
 147        int                     error;
 148
 149        xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
 150        error = xfs_trans_roll(tpp);
 151        if (!error)
 152                xfs_trans_ijoin(*tpp, ip, 0);
 153        return error;
 154}
 155