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_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
  18 #include <linux/iversion.h>
  19
  20 /*
  21  * Add a locked inode to the transaction.
  22  *
  23  * The inode must be locked, and it cannot be associated with any transaction.
  24  * If lock_flags is non-zero the inode will be unlocked on transaction commit.
  25  */
  26 void
  27 xfs_trans_ijoin(
  28         struct xfs_trans        *tp,
  29         struct xfs_inode        *ip,
  30         uint                    lock_flags)
  31 {
  32         struct xfs_inode_log_item *iip;
  33
  34         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  35         if (ip->i_itemp == NULL)
  36                 xfs_inode_item_init(ip, ip->i_mount);
  37         iip = ip->i_itemp;
  38
  39         ASSERT(iip->ili_lock_flags == 0);
  40         iip->ili_lock_flags = lock_flags;
  41         ASSERT(!xfs_iflags_test(ip, XFS_ISTALE));
  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         if (flags & XFS_ICHGTIME_CREATE)
  73                 ip->i_d.di_crtime = tv;
  74 }
  75
  76 /*
  77  * This is called to mark the fields indicated in fieldmask as needing to be
  78  * logged when the transaction is committed.  The inode must already be
  79  * associated with the given transaction.
  80  *
  81  * The values for fieldmask are defined in xfs_inode_item.h.  We always log all
  82  * of the core inode if any of it has changed, and we always log all of the
  83  * inline data/extents/b-tree root if any of them has changed.
  84  *
  85  * Grab and pin the cluster buffer associated with this inode to avoid RMW
  86  * cycles at inode writeback time. Avoid the need to add error handling to every
  87  * xfs_trans_log_inode() call by shutting down on read error.  This will cause
  88  * transactions to fail and everything to error out, just like if we return a
  89  * read error in a dirty transaction and cancel it.
  90  */
  91 void
  92 xfs_trans_log_inode(
  93         struct xfs_trans        *tp,
  94         struct xfs_inode        *ip,
  95         uint                    flags)
  96 {
  97         struct xfs_inode_log_item *iip = ip->i_itemp;
  98         struct inode            *inode = VFS_I(ip);
  99         uint                    iversion_flags = 0;
 100
 101         ASSERT(iip);
 102         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 103         ASSERT(!xfs_iflags_test(ip, XFS_ISTALE));
 104
 105         tp->t_flags |= XFS_TRANS_DIRTY;
 106
 107         /*
 108          * Don't bother with i_lock for the I_DIRTY_TIME check here, as races
 109          * don't matter - we either will need an extra transaction in 24 hours
 110          * to log the timestamps, or will clear already cleared fields in the
 111          * worst case.
 112          */
 113         if (inode->i_state & I_DIRTY_TIME) {
 114                 spin_lock(&inode->i_lock);
 115                 inode->i_state &= ~I_DIRTY_TIME;
 116                 spin_unlock(&inode->i_lock);
 117         }
 118
 119         /*
 120          * First time we log the inode in a transaction, bump the inode change
 121          * counter if it is configured for this to occur. While we have the
 122          * inode locked exclusively for metadata modification, we can usually
 123          * avoid setting XFS_ILOG_CORE if no one has queried the value since
 124          * the last time it was incremented. If we have XFS_ILOG_CORE already
 125          * set however, then go ahead and bump the i_version counter
 126          * unconditionally.
 127          */
 128         if (!test_and_set_bit(XFS_LI_DIRTY, &iip->ili_item.li_flags)) {
 129                 if (IS_I_VERSION(inode) &&
 130                     inode_maybe_inc_iversion(inode, flags & XFS_ILOG_CORE))
 131                         iversion_flags = XFS_ILOG_CORE;
 132         }
 133
 134         /*
 135          * If we're updating the inode core or the timestamps and it's possible
 136          * to upgrade this inode to bigtime format, do so now.
 137          */
 138         if ((flags & (XFS_ILOG_CORE | XFS_ILOG_TIMESTAMP)) &&
 139             xfs_sb_version_hasbigtime(&ip->i_mount->m_sb) &&
 140             !xfs_inode_has_bigtime(ip)) {
 141                 ip->i_d.di_flags2 |= XFS_DIFLAG2_BIGTIME;
 142                 flags |= XFS_ILOG_CORE;
 143         }
 144
 145         /*
 146          * Record the specific change for fdatasync optimisation. This allows
 147          * fdatasync to skip log forces for inodes that are only timestamp
 148          * dirty.
 149          */
 150         spin_lock(&iip->ili_lock);
 151         iip->ili_fsync_fields |= flags;
 152
 153         if (!iip->ili_item.li_buf) {
 154                 struct xfs_buf  *bp;
 155                 int             error;
 156
 157                 /*
 158                  * We hold the ILOCK here, so this inode is not going to be
 159                  * flushed while we are here. Further, because there is no
 160                  * buffer attached to the item, we know that there is no IO in
 161                  * progress, so nothing will clear the ili_fields while we read
 162                  * in the buffer. Hence we can safely drop the spin lock and
 163                  * read the buffer knowing that the state will not change from
 164                  * here.
 165                  */
 166                 spin_unlock(&iip->ili_lock);
 167                 error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, NULL,
 168                                         &bp, 0);
 169                 if (error) {
 170                         xfs_force_shutdown(ip->i_mount, SHUTDOWN_META_IO_ERROR);
 171                         return;
 172                 }
 173
 174                 /*
 175                  * We need an explicit buffer reference for the log item but
 176                  * don't want the buffer to remain attached to the transaction.
 177                  * Hold the buffer but release the transaction reference once
 178                  * we've attached the inode log item to the buffer log item
 179                  * list.
 180                  */
 181                 xfs_buf_hold(bp);
 182                 spin_lock(&iip->ili_lock);
 183                 iip->ili_item.li_buf = bp;
 184                 bp->b_flags |= _XBF_INODES;
 185                 list_add_tail(&iip->ili_item.li_bio_list, &bp->b_li_list);
 186                 xfs_trans_brelse(tp, bp);
 187         }
 188
 189         /*
 190          * Always OR in the bits from the ili_last_fields field.  This is to
 191          * coordinate with the xfs_iflush() and xfs_buf_inode_iodone() routines
 192          * in the eventual clearing of the ili_fields bits.  See the big comment
 193          * in xfs_iflush() for an explanation of this coordination mechanism.
 194          */
 195         iip->ili_fields |= (flags | iip->ili_last_fields | iversion_flags);
 196         spin_unlock(&iip->ili_lock);
 197 }
 198
 199 int
 200 xfs_trans_roll_inode(
 201         struct xfs_trans        **tpp,
 202         struct xfs_inode        *ip)
 203 {
 204         int                     error;
 205
 206         xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
 207         error = xfs_trans_roll(tpp);
 208         if (!error)
 209                 xfs_trans_ijoin(*tpp, ip, 0);
 210         return error;
 211 }