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_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_diflags2 |= 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, &bp); 168 if (error) { 169 xfs_force_shutdown(ip->i_mount, SHUTDOWN_META_IO_ERROR); 170 return; 171 } 172 173 /* 174 * We need an explicit buffer reference for the log item but 175 * don't want the buffer to remain attached to the transaction. 176 * Hold the buffer but release the transaction reference once 177 * we've attached the inode log item to the buffer log item 178 * list. 179 */ 180 xfs_buf_hold(bp); 181 spin_lock(&iip->ili_lock); 182 iip->ili_item.li_buf = bp; 183 bp->b_flags |= _XBF_INODES; 184 list_add_tail(&iip->ili_item.li_bio_list, &bp->b_li_list); 185 xfs_trans_brelse(tp, bp); 186 } 187 188 /* 189 * Always OR in the bits from the ili_last_fields field. This is to 190 * coordinate with the xfs_iflush() and xfs_buf_inode_iodone() routines 191 * in the eventual clearing of the ili_fields bits. See the big comment 192 * in xfs_iflush() for an explanation of this coordination mechanism. 193 */ 194 iip->ili_fields |= (flags | iip->ili_last_fields | iversion_flags); 195 spin_unlock(&iip->ili_lock); 196 } 197 198 int 199 xfs_trans_roll_inode( 200 struct xfs_trans **tpp, 201 struct xfs_inode *ip) 202 { 203 int error; 204 205 xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE); 206 error = xfs_trans_roll(tpp); 207 if (!error) 208 xfs_trans_ijoin(*tpp, ip, 0); 209 return error; 210 } 211