xfs: move the di_flushiter field to struct xfs_inode

In preparation of removing the historic icinode struct, move the
flushiter field into the containing xfs_inode structure.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_inode_buf.c

@@ -193,7 +193,7 @@ xfs_inode_from_disk(
 	 * inode. If the inode is unused, mode is zero and we shouldn't mess
 	 * with the uninitialized part of it.
 	 */
-	to->di_flushiter = be16_to_cpu(from->di_flushiter);
+	ip->i_flushiter = be16_to_cpu(from->di_flushiter);
 	inode->i_generation = be32_to_cpu(from->di_gen);
 	inode->i_mode = be16_to_cpu(from->di_mode);
 	if (!inode->i_mode)
@@ -327,7 +327,7 @@ xfs_inode_to_disk(
 		to->di_flushiter = 0;
 	} else {
 		to->di_version = 2;
-		to->di_flushiter = cpu_to_be16(from->di_flushiter);
+		to->di_flushiter = cpu_to_be16(ip->i_flushiter);
 	}
 }
 

fs/xfs/libxfs/xfs_inode_buf.h

@@ -16,7 +16,6 @@ struct xfs_dinode;
  * format specific structures at the appropriate time.
  */
 struct xfs_icdinode {
-	uint16_t	di_flushiter;	/* incremented on flush */
 	uint8_t		di_forkoff;	/* attr fork offs, <<3 for 64b align */
 	uint16_t	di_flags;	/* random flags, XFS_DIFLAG_... */
 

fs/xfs/xfs_icache.c

@@ -499,7 +499,7 @@ xfs_iget_cache_miss(
 	 * simply build the new inode core with a random generation number.
 	 *
 	 * For version 4 (and older) superblocks, log recovery is dependent on
-	 * the di_flushiter field being initialised from the current on-disk
+	 * the i_flushiter field being initialised from the current on-disk
 	 * value and hence we must also read the inode off disk even when
 	 * initializing new inodes.
 	 */

fs/xfs/xfs_inode.c

@@ -3454,16 +3454,15 @@ xfs_iflush(
 	}
 
 	/*
-	 * Inode item log recovery for v2 inodes are dependent on the
-	 * di_flushiter count for correct sequencing. We bump the flush
-	 * iteration count so we can detect flushes which postdate a log record
-	 * during recovery. This is redundant as we now log every change and
-	 * hence this can't happen but we need to still do it to ensure
-	 * backwards compatibility with old kernels that predate logging all
-	 * inode changes.
+	 * Inode item log recovery for v2 inodes are dependent on the flushiter
+	 * count for correct sequencing.  We bump the flush iteration count so
+	 * we can detect flushes which postdate a log record during recovery.
+	 * This is redundant as we now log every change and hence this can't
+	 * happen but we need to still do it to ensure backwards compatibility
+	 * with old kernels that predate logging all inode changes.
 	 */
 	if (!xfs_sb_version_has_v3inode(&mp->m_sb))
-		ip->i_d.di_flushiter++;
+		ip->i_flushiter++;
 
 	/*
 	 * If there are inline format data / attr forks attached to this inode,
@@ -3484,8 +3483,8 @@ xfs_iflush(
 	xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn);
 
 	/* Wrap, we never let the log put out DI_MAX_FLUSH */
-	if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
-		ip->i_d.di_flushiter = 0;
+	if (ip->i_flushiter == DI_MAX_FLUSH)
+		ip->i_flushiter = 0;
 
 	xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
 	if (XFS_IFORK_Q(ip))

fs/xfs/xfs_inode.h

@@ -59,6 +59,7 @@ typedef struct xfs_inode {
 	prid_t			i_projid;	/* owner's project id */
 	xfs_extlen_t		i_extsize;	/* basic/minimum extent size */
 	xfs_extlen_t		i_cowextsize;	/* basic cow extent size */
+	uint16_t		i_flushiter;	/* incremented on flush */
 
 	struct xfs_icdinode	i_d;		/* most of ondisk inode */
 

fs/xfs/xfs_inode_item.c

@@ -396,7 +396,7 @@ xfs_inode_to_log_dinode(
 		to->di_flushiter = 0;
 	} else {
 		to->di_version = 2;
-		to->di_flushiter = from->di_flushiter;
+		to->di_flushiter = ip->i_flushiter;
 	}
 }