fs/xfs/libxfs/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_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  */
  24 void
  25 xfs_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  */
  51 void
  52 xfs_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  */
  82 void
  83 xfs_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 | I_DIRTY_TIME_EXPIRED)) {
 100                 spin_lock(&inode->i_lock);
 101                 inode->i_state &= ~(I_DIRTY_TIME | I_DIRTY_TIME_EXPIRED);
 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
 142 int
 143 xfs_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 }