fs/xfs/xfs_trans_inode.c

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