xfs: refactor log recovery buffer item dispatch for pass2 commit functions

Move the log buffer item pass2 commit code into the per-item source code
files and use the dispatch function to call it.  We do these one at a
time because there's a lot of code to move.  No functional changes.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 7 insertions, 791 deletions

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 2511f2874464..eaf2ea8da5d6 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -284,7 +284,7 @@ xlog_header_check_mount(
 	return 0;
 }
 
-STATIC void
+void
 xlog_recover_iodone(
 	struct xfs_buf	*bp)
 {
@@ -1985,7 +1985,7 @@ xlog_add_buffer_cancelled(
 /*
  * Check if there is and entry for blkno, len in the buffer cancel record table.
  */
-static bool
+bool
 xlog_is_buffer_cancelled(
 	struct xlog		*log,
 	xfs_daddr_t		blkno,
@@ -2002,7 +2002,7 @@ xlog_is_buffer_cancelled(
  * buffer is re-used again after its last cancellation we actually replay the
  * changes made at that point.
  */
-static bool
+bool
 xlog_put_buffer_cancelled(
 	struct xlog		*log,
 	xfs_daddr_t		blkno,
@@ -2035,791 +2035,6 @@ xlog_buf_readahead(
 }
 
 /*
- * Perform recovery for a buffer full of inodes.  In these buffers, the only
- * data which should be recovered is that which corresponds to the
- * di_next_unlinked pointers in the on disk inode structures.  The rest of the
- * data for the inodes is always logged through the inodes themselves rather
- * than the inode buffer and is recovered in xlog_recover_inode_pass2().
- *
- * The only time when buffers full of inodes are fully recovered is when the
- * buffer is full of newly allocated inodes.  In this case the buffer will
- * not be marked as an inode buffer and so will be sent to
- * xlog_recover_do_reg_buffer() below during recovery.
- */
-STATIC int
-xlog_recover_do_inode_buffer(
-	struct xfs_mount	*mp,
-	struct xlog_recover_item *item,
-	struct xfs_buf		*bp,
-	xfs_buf_log_format_t	*buf_f)
-{
-	int			i;
-	int			item_index = 0;
-	int			bit = 0;
-	int			nbits = 0;
-	int			reg_buf_offset = 0;
-	int			reg_buf_bytes = 0;
-	int			next_unlinked_offset;
-	int			inodes_per_buf;
-	xfs_agino_t		*logged_nextp;
-	xfs_agino_t		*buffer_nextp;
-
-	trace_xfs_log_recover_buf_inode_buf(mp->m_log, buf_f);
-
-	/*
-	 * Post recovery validation only works properly on CRC enabled
-	 * filesystems.
-	 */
-	if (xfs_sb_version_hascrc(&mp->m_sb))
-		bp->b_ops = &xfs_inode_buf_ops;
-
-	inodes_per_buf = BBTOB(bp->b_length) >> mp->m_sb.sb_inodelog;
-	for (i = 0; i < inodes_per_buf; i++) {
-		next_unlinked_offset = (i * mp->m_sb.sb_inodesize) +
-			offsetof(xfs_dinode_t, di_next_unlinked);
-
-		while (next_unlinked_offset >=
-		       (reg_buf_offset + reg_buf_bytes)) {
-			/*
-			 * The next di_next_unlinked field is beyond
-			 * the current logged region.  Find the next
-			 * logged region that contains or is beyond
-			 * the current di_next_unlinked field.
-			 */
-			bit += nbits;
-			bit = xfs_next_bit(buf_f->blf_data_map,
-					   buf_f->blf_map_size, bit);
-
-			/*
-			 * If there are no more logged regions in the
-			 * buffer, then we're done.
-			 */
-			if (bit == -1)
-				return 0;
-
-			nbits = xfs_contig_bits(buf_f->blf_data_map,
-						buf_f->blf_map_size, bit);
-			ASSERT(nbits > 0);
-			reg_buf_offset = bit << XFS_BLF_SHIFT;
-			reg_buf_bytes = nbits << XFS_BLF_SHIFT;
-			item_index++;
-		}
-
-		/*
-		 * If the current logged region starts after the current
-		 * di_next_unlinked field, then move on to the next
-		 * di_next_unlinked field.
-		 */
-		if (next_unlinked_offset < reg_buf_offset)
-			continue;
-
-		ASSERT(item->ri_buf[item_index].i_addr != NULL);
-		ASSERT((item->ri_buf[item_index].i_len % XFS_BLF_CHUNK) == 0);
-		ASSERT((reg_buf_offset + reg_buf_bytes) <= BBTOB(bp->b_length));
-
-		/*
-		 * The current logged region contains a copy of the
-		 * current di_next_unlinked field.  Extract its value
-		 * and copy it to the buffer copy.
-		 */
-		logged_nextp = item->ri_buf[item_index].i_addr +
-				next_unlinked_offset - reg_buf_offset;
-		if (XFS_IS_CORRUPT(mp, *logged_nextp == 0)) {
-			xfs_alert(mp,
-		"Bad inode buffer log record (ptr = "PTR_FMT", bp = "PTR_FMT"). "
-		"Trying to replay bad (0) inode di_next_unlinked field.",
-				item, bp);
-			return -EFSCORRUPTED;
-		}
-
-		buffer_nextp = xfs_buf_offset(bp, next_unlinked_offset);
-		*buffer_nextp = *logged_nextp;
-
-		/*
-		 * If necessary, recalculate the CRC in the on-disk inode. We
-		 * have to leave the inode in a consistent state for whoever
-		 * reads it next....
-		 */
-		xfs_dinode_calc_crc(mp,
-				xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize));
-
-	}
-
-	return 0;
-}
-
-/*
- * V5 filesystems know the age of the buffer on disk being recovered. We can
- * have newer objects on disk than we are replaying, and so for these cases we
- * don't want to replay the current change as that will make the buffer contents
- * temporarily invalid on disk.
- *
- * The magic number might not match the buffer type we are going to recover
- * (e.g. reallocated blocks), so we ignore the xfs_buf_log_format flags.  Hence
- * extract the LSN of the existing object in the buffer based on it's current
- * magic number.  If we don't recognise the magic number in the buffer, then
- * return a LSN of -1 so that the caller knows it was an unrecognised block and
- * so can recover the buffer.
- *
- * Note: we cannot rely solely on magic number matches to determine that the
- * buffer has a valid LSN - we also need to verify that it belongs to this
- * filesystem, so we need to extract the object's LSN and compare it to that
- * which we read from the superblock. If the UUIDs don't match, then we've got a
- * stale metadata block from an old filesystem instance that we need to recover
- * over the top of.
- */
-static xfs_lsn_t
-xlog_recover_get_buf_lsn(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp)
-{
-	uint32_t		magic32;
-	uint16_t		magic16;
-	uint16_t		magicda;
-	void			*blk = bp->b_addr;
-	uuid_t			*uuid;
-	xfs_lsn_t		lsn = -1;
-
-	/* v4 filesystems always recover immediately */
-	if (!xfs_sb_version_hascrc(&mp->m_sb))
-		goto recover_immediately;
-
-	magic32 = be32_to_cpu(*(__be32 *)blk);
-	switch (magic32) {
-	case XFS_ABTB_CRC_MAGIC:
-	case XFS_ABTC_CRC_MAGIC:
-	case XFS_ABTB_MAGIC:
-	case XFS_ABTC_MAGIC:
-	case XFS_RMAP_CRC_MAGIC:
-	case XFS_REFC_CRC_MAGIC:
-	case XFS_IBT_CRC_MAGIC:
-	case XFS_IBT_MAGIC: {
-		struct xfs_btree_block *btb = blk;
-
-		lsn = be64_to_cpu(btb->bb_u.s.bb_lsn);
-		uuid = &btb->bb_u.s.bb_uuid;
-		break;
-	}
-	case XFS_BMAP_CRC_MAGIC:
-	case XFS_BMAP_MAGIC: {
-		struct xfs_btree_block *btb = blk;
-
-		lsn = be64_to_cpu(btb->bb_u.l.bb_lsn);
-		uuid = &btb->bb_u.l.bb_uuid;
-		break;
-	}
-	case XFS_AGF_MAGIC:
-		lsn = be64_to_cpu(((struct xfs_agf *)blk)->agf_lsn);
-		uuid = &((struct xfs_agf *)blk)->agf_uuid;
-		break;
-	case XFS_AGFL_MAGIC:
-		lsn = be64_to_cpu(((struct xfs_agfl *)blk)->agfl_lsn);
-		uuid = &((struct xfs_agfl *)blk)->agfl_uuid;
-		break;
-	case XFS_AGI_MAGIC:
-		lsn = be64_to_cpu(((struct xfs_agi *)blk)->agi_lsn);
-		uuid = &((struct xfs_agi *)blk)->agi_uuid;
-		break;
-	case XFS_SYMLINK_MAGIC:
-		lsn = be64_to_cpu(((struct xfs_dsymlink_hdr *)blk)->sl_lsn);
-		uuid = &((struct xfs_dsymlink_hdr *)blk)->sl_uuid;
-		break;
-	case XFS_DIR3_BLOCK_MAGIC:
-	case XFS_DIR3_DATA_MAGIC:
-	case XFS_DIR3_FREE_MAGIC:
-		lsn = be64_to_cpu(((struct xfs_dir3_blk_hdr *)blk)->lsn);
-		uuid = &((struct xfs_dir3_blk_hdr *)blk)->uuid;
-		break;
-	case XFS_ATTR3_RMT_MAGIC:
-		/*
-		 * Remote attr blocks are written synchronously, rather than
-		 * being logged. That means they do not contain a valid LSN
-		 * (i.e. transactionally ordered) in them, and hence any time we
-		 * see a buffer to replay over the top of a remote attribute
-		 * block we should simply do so.
-		 */
-		goto recover_immediately;
-	case XFS_SB_MAGIC:
-		/*
-		 * superblock uuids are magic. We may or may not have a
-		 * sb_meta_uuid on disk, but it will be set in the in-core
-		 * superblock. We set the uuid pointer for verification
-		 * according to the superblock feature mask to ensure we check
-		 * the relevant UUID in the superblock.
-		 */
-		lsn = be64_to_cpu(((struct xfs_dsb *)blk)->sb_lsn);
-		if (xfs_sb_version_hasmetauuid(&mp->m_sb))
-			uuid = &((struct xfs_dsb *)blk)->sb_meta_uuid;
-		else
-			uuid = &((struct xfs_dsb *)blk)->sb_uuid;
-		break;
-	default:
-		break;
-	}
-
-	if (lsn != (xfs_lsn_t)-1) {
-		if (!uuid_equal(&mp->m_sb.sb_meta_uuid, uuid))
-			goto recover_immediately;
-		return lsn;
-	}
-
-	magicda = be16_to_cpu(((struct xfs_da_blkinfo *)blk)->magic);
-	switch (magicda) {
-	case XFS_DIR3_LEAF1_MAGIC:
-	case XFS_DIR3_LEAFN_MAGIC:
-	case XFS_DA3_NODE_MAGIC:
-		lsn = be64_to_cpu(((struct xfs_da3_blkinfo *)blk)->lsn);
-		uuid = &((struct xfs_da3_blkinfo *)blk)->uuid;
-		break;
-	default:
-		break;
-	}
-
-	if (lsn != (xfs_lsn_t)-1) {
-		if (!uuid_equal(&mp->m_sb.sb_uuid, uuid))
-			goto recover_immediately;
-		return lsn;
-	}
-
-	/*
-	 * We do individual object checks on dquot and inode buffers as they
-	 * have their own individual LSN records. Also, we could have a stale
-	 * buffer here, so we have to at least recognise these buffer types.
-	 *
-	 * A notd complexity here is inode unlinked list processing - it logs
-	 * the inode directly in the buffer, but we don't know which inodes have
-	 * been modified, and there is no global buffer LSN. Hence we need to
-	 * recover all inode buffer types immediately. This problem will be
-	 * fixed by logical logging of the unlinked list modifications.
-	 */
-	magic16 = be16_to_cpu(*(__be16 *)blk);
-	switch (magic16) {
-	case XFS_DQUOT_MAGIC:
-	case XFS_DINODE_MAGIC:
-		goto recover_immediately;
-	default:
-		break;
-	}
-
-	/* unknown buffer contents, recover immediately */
-
-recover_immediately:
-	return (xfs_lsn_t)-1;
-
-}
-
-/*
- * Validate the recovered buffer is of the correct type and attach the
- * appropriate buffer operations to them for writeback. Magic numbers are in a
- * few places:
- *	the first 16 bits of the buffer (inode buffer, dquot buffer),
- *	the first 32 bits of the buffer (most blocks),
- *	inside a struct xfs_da_blkinfo at the start of the buffer.
- */
-static void
-xlog_recover_validate_buf_type(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	xfs_buf_log_format_t	*buf_f,
-	xfs_lsn_t		current_lsn)
-{
-	struct xfs_da_blkinfo	*info = bp->b_addr;
-	uint32_t		magic32;
-	uint16_t		magic16;
-	uint16_t		magicda;
-	char			*warnmsg = NULL;
-
-	/*
-	 * We can only do post recovery validation on items on CRC enabled
-	 * fielsystems as we need to know when the buffer was written to be able
-	 * to determine if we should have replayed the item. If we replay old
-	 * metadata over a newer buffer, then it will enter a temporarily
-	 * inconsistent state resulting in verification failures. Hence for now
-	 * just avoid the verification stage for non-crc filesystems
-	 */
-	if (!xfs_sb_version_hascrc(&mp->m_sb))
-		return;
-
-	magic32 = be32_to_cpu(*(__be32 *)bp->b_addr);
-	magic16 = be16_to_cpu(*(__be16*)bp->b_addr);
-	magicda = be16_to_cpu(info->magic);
-	switch (xfs_blft_from_flags(buf_f)) {
-	case XFS_BLFT_BTREE_BUF:
-		switch (magic32) {
-		case XFS_ABTB_CRC_MAGIC:
-		case XFS_ABTB_MAGIC:
-			bp->b_ops = &xfs_bnobt_buf_ops;
-			break;
-		case XFS_ABTC_CRC_MAGIC:
-		case XFS_ABTC_MAGIC:
-			bp->b_ops = &xfs_cntbt_buf_ops;
-			break;
-		case XFS_IBT_CRC_MAGIC:
-		case XFS_IBT_MAGIC:
-			bp->b_ops = &xfs_inobt_buf_ops;
-			break;
-		case XFS_FIBT_CRC_MAGIC:
-		case XFS_FIBT_MAGIC:
-			bp->b_ops = &xfs_finobt_buf_ops;
-			break;
-		case XFS_BMAP_CRC_MAGIC:
-		case XFS_BMAP_MAGIC:
-			bp->b_ops = &xfs_bmbt_buf_ops;
-			break;
-		case XFS_RMAP_CRC_MAGIC:
-			bp->b_ops = &xfs_rmapbt_buf_ops;
-			break;
-		case XFS_REFC_CRC_MAGIC:
-			bp->b_ops = &xfs_refcountbt_buf_ops;
-			break;
-		default:
-			warnmsg = "Bad btree block magic!";
-			break;
-		}
-		break;
-	case XFS_BLFT_AGF_BUF:
-		if (magic32 != XFS_AGF_MAGIC) {
-			warnmsg = "Bad AGF block magic!";
-			break;
-		}
-		bp->b_ops = &xfs_agf_buf_ops;
-		break;
-	case XFS_BLFT_AGFL_BUF:
-		if (magic32 != XFS_AGFL_MAGIC) {
-			warnmsg = "Bad AGFL block magic!";
-			break;
-		}
-		bp->b_ops = &xfs_agfl_buf_ops;
-		break;
-	case XFS_BLFT_AGI_BUF:
-		if (magic32 != XFS_AGI_MAGIC) {
-			warnmsg = "Bad AGI block magic!";
-			break;
-		}
-		bp->b_ops = &xfs_agi_buf_ops;
-		break;
-	case XFS_BLFT_UDQUOT_BUF:
-	case XFS_BLFT_PDQUOT_BUF:
-	case XFS_BLFT_GDQUOT_BUF:
-#ifdef CONFIG_XFS_QUOTA
-		if (magic16 != XFS_DQUOT_MAGIC) {
-			warnmsg = "Bad DQUOT block magic!";
-			break;
-		}
-		bp->b_ops = &xfs_dquot_buf_ops;
-#else
-		xfs_alert(mp,
-	"Trying to recover dquots without QUOTA support built in!");
-		ASSERT(0);
-#endif
-		break;
-	case XFS_BLFT_DINO_BUF:
-		if (magic16 != XFS_DINODE_MAGIC) {
-			warnmsg = "Bad INODE block magic!";
-			break;
-		}
-		bp->b_ops = &xfs_inode_buf_ops;
-		break;
-	case XFS_BLFT_SYMLINK_BUF:
-		if (magic32 != XFS_SYMLINK_MAGIC) {
-			warnmsg = "Bad symlink block magic!";
-			break;
-		}
-		bp->b_ops = &xfs_symlink_buf_ops;
-		break;
-	case XFS_BLFT_DIR_BLOCK_BUF:
-		if (magic32 != XFS_DIR2_BLOCK_MAGIC &&
-		    magic32 != XFS_DIR3_BLOCK_MAGIC) {
-			warnmsg = "Bad dir block magic!";
-			break;
-		}
-		bp->b_ops = &xfs_dir3_block_buf_ops;
-		break;
-	case XFS_BLFT_DIR_DATA_BUF:
-		if (magic32 != XFS_DIR2_DATA_MAGIC &&
-		    magic32 != XFS_DIR3_DATA_MAGIC) {
-			warnmsg = "Bad dir data magic!";
-			break;
-		}
-		bp->b_ops = &xfs_dir3_data_buf_ops;
-		break;
-	case XFS_BLFT_DIR_FREE_BUF:
-		if (magic32 != XFS_DIR2_FREE_MAGIC &&
-		    magic32 != XFS_DIR3_FREE_MAGIC) {
-			warnmsg = "Bad dir3 free magic!";
-			break;
-		}
-		bp->b_ops = &xfs_dir3_free_buf_ops;
-		break;
-	case XFS_BLFT_DIR_LEAF1_BUF:
-		if (magicda != XFS_DIR2_LEAF1_MAGIC &&
-		    magicda != XFS_DIR3_LEAF1_MAGIC) {
-			warnmsg = "Bad dir leaf1 magic!";
-			break;
-		}
-		bp->b_ops = &xfs_dir3_leaf1_buf_ops;
-		break;
-	case XFS_BLFT_DIR_LEAFN_BUF:
-		if (magicda != XFS_DIR2_LEAFN_MAGIC &&
-		    magicda != XFS_DIR3_LEAFN_MAGIC) {
-			warnmsg = "Bad dir leafn magic!";
-			break;
-		}
-		bp->b_ops = &xfs_dir3_leafn_buf_ops;
-		break;
-	case XFS_BLFT_DA_NODE_BUF:
-		if (magicda != XFS_DA_NODE_MAGIC &&
-		    magicda != XFS_DA3_NODE_MAGIC) {
-			warnmsg = "Bad da node magic!";
-			break;
-		}
-		bp->b_ops = &xfs_da3_node_buf_ops;
-		break;
-	case XFS_BLFT_ATTR_LEAF_BUF:
-		if (magicda != XFS_ATTR_LEAF_MAGIC &&
-		    magicda != XFS_ATTR3_LEAF_MAGIC) {
-			warnmsg = "Bad attr leaf magic!";
-			break;
-		}
-		bp->b_ops = &xfs_attr3_leaf_buf_ops;
-		break;
-	case XFS_BLFT_ATTR_RMT_BUF:
-		if (magic32 != XFS_ATTR3_RMT_MAGIC) {
-			warnmsg = "Bad attr remote magic!";
-			break;
-		}
-		bp->b_ops = &xfs_attr3_rmt_buf_ops;
-		break;
-	case XFS_BLFT_SB_BUF:
-		if (magic32 != XFS_SB_MAGIC) {
-			warnmsg = "Bad SB block magic!";
-			break;
-		}
-		bp->b_ops = &xfs_sb_buf_ops;
-		break;
-#ifdef CONFIG_XFS_RT
-	case XFS_BLFT_RTBITMAP_BUF:
-	case XFS_BLFT_RTSUMMARY_BUF:
-		/* no magic numbers for verification of RT buffers */
-		bp->b_ops = &xfs_rtbuf_ops;
-		break;
-#endif /* CONFIG_XFS_RT */
-	default:
-		xfs_warn(mp, "Unknown buffer type %d!",
-			 xfs_blft_from_flags(buf_f));
-		break;
-	}
-
-	/*
-	 * Nothing else to do in the case of a NULL current LSN as this means
-	 * the buffer is more recent than the change in the log and will be
-	 * skipped.
-	 */
-	if (current_lsn == NULLCOMMITLSN)
-		return;
-
-	if (warnmsg) {
-		xfs_warn(mp, warnmsg);
-		ASSERT(0);
-	}
-
-	/*
-	 * We must update the metadata LSN of the buffer as it is written out to
-	 * ensure that older transactions never replay over this one and corrupt
-	 * the buffer. This can occur if log recovery is interrupted at some
-	 * point after the current transaction completes, at which point a
-	 * subsequent mount starts recovery from the beginning.
-	 *
-	 * Write verifiers update the metadata LSN from log items attached to
-	 * the buffer. Therefore, initialize a bli purely to carry the LSN to
-	 * the verifier. We'll clean it up in our ->iodone() callback.
-	 */
-	if (bp->b_ops) {
-		struct xfs_buf_log_item	*bip;
-
-		ASSERT(!bp->b_iodone || bp->b_iodone == xlog_recover_iodone);
-		bp->b_iodone = xlog_recover_iodone;
-		xfs_buf_item_init(bp, mp);
-		bip = bp->b_log_item;
-		bip->bli_item.li_lsn = current_lsn;
-	}
-}
-
-/*
- * Perform a 'normal' buffer recovery.  Each logged region of the
- * buffer should be copied over the corresponding region in the
- * given buffer.  The bitmap in the buf log format structure indicates
- * where to place the logged data.
- */
-STATIC void
-xlog_recover_do_reg_buffer(
-	struct xfs_mount	*mp,
-	struct xlog_recover_item *item,
-	struct xfs_buf		*bp,
-	xfs_buf_log_format_t	*buf_f,
-	xfs_lsn_t		current_lsn)
-{
-	int			i;
-	int			bit;
-	int			nbits;
-	xfs_failaddr_t		fa;
-	const size_t		size_disk_dquot = sizeof(struct xfs_disk_dquot);
-
-	trace_xfs_log_recover_buf_reg_buf(mp->m_log, buf_f);
-
-	bit = 0;
-	i = 1;  /* 0 is the buf format structure */
-	while (1) {
-		bit = xfs_next_bit(buf_f->blf_data_map,
-				   buf_f->blf_map_size, bit);
-		if (bit == -1)
-			break;
-		nbits = xfs_contig_bits(buf_f->blf_data_map,
-					buf_f->blf_map_size, bit);
-		ASSERT(nbits > 0);
-		ASSERT(item->ri_buf[i].i_addr != NULL);
-		ASSERT(item->ri_buf[i].i_len % XFS_BLF_CHUNK == 0);
-		ASSERT(BBTOB(bp->b_length) >=
-		       ((uint)bit << XFS_BLF_SHIFT) + (nbits << XFS_BLF_SHIFT));
-
-		/*
-		 * The dirty regions logged in the buffer, even though
-		 * contiguous, may span multiple chunks. This is because the
-		 * dirty region may span a physical page boundary in a buffer
-		 * and hence be split into two separate vectors for writing into
-		 * the log. Hence we need to trim nbits back to the length of
-		 * the current region being copied out of the log.
-		 */
-		if (item->ri_buf[i].i_len < (nbits << XFS_BLF_SHIFT))
-			nbits = item->ri_buf[i].i_len >> XFS_BLF_SHIFT;
-
-		/*
-		 * Do a sanity check if this is a dquot buffer. Just checking
-		 * the first dquot in the buffer should do. XXXThis is
-		 * probably a good thing to do for other buf types also.
-		 */
-		fa = NULL;
-		if (buf_f->blf_flags &
-		   (XFS_BLF_UDQUOT_BUF|XFS_BLF_PDQUOT_BUF|XFS_BLF_GDQUOT_BUF)) {
-			if (item->ri_buf[i].i_addr == NULL) {
-				xfs_alert(mp,
-					"XFS: NULL dquot in %s.", __func__);
-				goto next;
-			}
-			if (item->ri_buf[i].i_len < size_disk_dquot) {
-				xfs_alert(mp,
-					"XFS: dquot too small (%d) in %s.",
-					item->ri_buf[i].i_len, __func__);
-				goto next;
-			}
-			fa = xfs_dquot_verify(mp, item->ri_buf[i].i_addr,
-					       -1, 0);
-			if (fa) {
-				xfs_alert(mp,
-	"dquot corrupt at %pS trying to replay into block 0x%llx",
-					fa, bp->b_bn);
-				goto next;
-			}
-		}
-
-		memcpy(xfs_buf_offset(bp,
-			(uint)bit << XFS_BLF_SHIFT),	/* dest */
-			item->ri_buf[i].i_addr,		/* source */
-			nbits<<XFS_BLF_SHIFT);		/* length */
- next:
-		i++;
-		bit += nbits;
-	}
-
-	/* Shouldn't be any more regions */
-	ASSERT(i == item->ri_total);
-
-	xlog_recover_validate_buf_type(mp, bp, buf_f, current_lsn);
-}
-
-/*
- * Perform a dquot buffer recovery.
- * Simple algorithm: if we have found a QUOTAOFF log item of the same type
- * (ie. USR or GRP), then just toss this buffer away; don't recover it.
- * Else, treat it as a regular buffer and do recovery.
- *
- * Return false if the buffer was tossed and true if we recovered the buffer to
- * indicate to the caller if the buffer needs writing.
- */
-STATIC bool
-xlog_recover_do_dquot_buffer(
-	struct xfs_mount		*mp,
-	struct xlog			*log,
-	struct xlog_recover_item	*item,
-	struct xfs_buf			*bp,
-	struct xfs_buf_log_format	*buf_f)
-{
-	uint			type;
-
-	trace_xfs_log_recover_buf_dquot_buf(log, buf_f);
-
-	/*
-	 * Filesystems are required to send in quota flags at mount time.
-	 */
-	if (!mp->m_qflags)
-		return false;
-
-	type = 0;
-	if (buf_f->blf_flags & XFS_BLF_UDQUOT_BUF)
-		type |= XFS_DQ_USER;
-	if (buf_f->blf_flags & XFS_BLF_PDQUOT_BUF)
-		type |= XFS_DQ_PROJ;
-	if (buf_f->blf_flags & XFS_BLF_GDQUOT_BUF)
-		type |= XFS_DQ_GROUP;
-	/*
-	 * This type of quotas was turned off, so ignore this buffer
-	 */
-	if (log->l_quotaoffs_flag & type)
-		return false;
-
-	xlog_recover_do_reg_buffer(mp, item, bp, buf_f, NULLCOMMITLSN);
-	return true;
-}
-
-/*
- * This routine replays a modification made to a buffer at runtime.
- * There are actually two types of buffer, regular and inode, which
- * are handled differently.  Inode buffers are handled differently
- * in that we only recover a specific set of data from them, namely
- * the inode di_next_unlinked fields.  This is because all other inode
- * data is actually logged via inode records and any data we replay
- * here which overlaps that may be stale.
- *
- * When meta-data buffers are freed at run time we log a buffer item
- * with the XFS_BLF_CANCEL bit set to indicate that previous copies
- * of the buffer in the log should not be replayed at recovery time.
- * This is so that if the blocks covered by the buffer are reused for
- * file data before we crash we don't end up replaying old, freed
- * meta-data into a user's file.
- *
- * To handle the cancellation of buffer log items, we make two passes
- * over the log during recovery.  During the first we build a table of
- * those buffers which have been cancelled, and during the second we
- * only replay those buffers which do not have corresponding cancel
- * records in the table.  See xlog_recover_buffer_pass[1,2] above
- * for more details on the implementation of the table of cancel records.
- */
-STATIC int
-xlog_recover_buffer_pass2(
-	struct xlog			*log,
-	struct list_head		*buffer_list,
-	struct xlog_recover_item	*item,
-	xfs_lsn_t			current_lsn)
-{
-	xfs_buf_log_format_t	*buf_f = item->ri_buf[0].i_addr;
-	xfs_mount_t		*mp = log->l_mp;
-	xfs_buf_t		*bp;
-	int			error;
-	uint			buf_flags;
-	xfs_lsn_t		lsn;
-
-	/*
-	 * In this pass we only want to recover all the buffers which have
-	 * not been cancelled and are not cancellation buffers themselves.
-	 */
-	if (buf_f->blf_flags & XFS_BLF_CANCEL) {
-		if (xlog_put_buffer_cancelled(log, buf_f->blf_blkno,
-				buf_f->blf_len))
-			goto cancelled;
-	} else {
-
-		if (xlog_is_buffer_cancelled(log, buf_f->blf_blkno,
-				buf_f->blf_len))
-			goto cancelled;
-	}
-
-	trace_xfs_log_recover_buf_recover(log, buf_f);
-
-	buf_flags = 0;
-	if (buf_f->blf_flags & XFS_BLF_INODE_BUF)
-		buf_flags |= XBF_UNMAPPED;
-
-	error = xfs_buf_read(mp->m_ddev_targp, buf_f->blf_blkno, buf_f->blf_len,
-			  buf_flags, &bp, NULL);
-	if (error)
-		return error;
-
-	/*
-	 * Recover the buffer only if we get an LSN from it and it's less than
-	 * the lsn of the transaction we are replaying.
-	 *
-	 * Note that we have to be extremely careful of readahead here.
-	 * Readahead does not attach verfiers to the buffers so if we don't
-	 * actually do any replay after readahead because of the LSN we found
-	 * in the buffer if more recent than that current transaction then we
-	 * need to attach the verifier directly. Failure to do so can lead to
-	 * future recovery actions (e.g. EFI and unlinked list recovery) can
-	 * operate on the buffers and they won't get the verifier attached. This
-	 * can lead to blocks on disk having the correct content but a stale
-	 * CRC.
-	 *
-	 * It is safe to assume these clean buffers are currently up to date.
-	 * If the buffer is dirtied by a later transaction being replayed, then
-	 * the verifier will be reset to match whatever recover turns that
-	 * buffer into.
-	 */
-	lsn = xlog_recover_get_buf_lsn(mp, bp);
-	if (lsn && lsn != -1 && XFS_LSN_CMP(lsn, current_lsn) >= 0) {
-		trace_xfs_log_recover_buf_skip(log, buf_f);
-		xlog_recover_validate_buf_type(mp, bp, buf_f, NULLCOMMITLSN);
-		goto out_release;
-	}
-
-	if (buf_f->blf_flags & XFS_BLF_INODE_BUF) {
-		error = xlog_recover_do_inode_buffer(mp, item, bp, buf_f);
-		if (error)
-			goto out_release;
-	} else if (buf_f->blf_flags &
-		  (XFS_BLF_UDQUOT_BUF|XFS_BLF_PDQUOT_BUF|XFS_BLF_GDQUOT_BUF)) {
-		bool	dirty;
-
-		dirty = xlog_recover_do_dquot_buffer(mp, log, item, bp, buf_f);
-		if (!dirty)
-			goto out_release;
-	} else {
-		xlog_recover_do_reg_buffer(mp, item, bp, buf_f, current_lsn);
-	}
-
-	/*
-	 * Perform delayed write on the buffer.  Asynchronous writes will be
-	 * slower when taking into account all the buffers to be flushed.
-	 *
-	 * Also make sure that only inode buffers with good sizes stay in
-	 * the buffer cache.  The kernel moves inodes in buffers of 1 block
-	 * or inode_cluster_size bytes, whichever is bigger.  The inode
-	 * buffers in the log can be a different size if the log was generated
-	 * by an older kernel using unclustered inode buffers or a newer kernel
-	 * running with a different inode cluster size.  Regardless, if the
-	 * the inode buffer size isn't max(blocksize, inode_cluster_size)
-	 * for *our* value of inode_cluster_size, then we need to keep
-	 * the buffer out of the buffer cache so that the buffer won't
-	 * overlap with future reads of those inodes.
-	 */
-	if (XFS_DINODE_MAGIC ==
-	    be16_to_cpu(*((__be16 *)xfs_buf_offset(bp, 0))) &&
-	    (BBTOB(bp->b_length) != M_IGEO(log->l_mp)->inode_cluster_size)) {
-		xfs_buf_stale(bp);
-		error = xfs_bwrite(bp);
-	} else {
-		ASSERT(bp->b_mount == mp);
-		bp->b_iodone = xlog_recover_iodone;
-		xfs_buf_delwri_queue(bp, buffer_list);
-	}
-
-out_release:
-	xfs_buf_relse(bp);
-	return error;
-cancelled:
-	trace_xfs_log_recover_buf_cancel(log, buf_f);
-	return 0;
-}
-
-/*
  * Inode fork owner changes
  *
  * If we have been told that we have to reparent the inode fork, it's because an
@@ -3846,10 +3061,11 @@ xlog_recover_commit_pass2(
 {
 	trace_xfs_log_recover_item_recover(log, trans, item, XLOG_RECOVER_PASS2);
 
+	if (item->ri_ops->commit_pass2)
+		return item->ri_ops->commit_pass2(log, buffer_list, item,
+				trans->r_lsn);
+
 	switch (ITEM_TYPE(item)) {
-	case XFS_LI_BUF:
-		return xlog_recover_buffer_pass2(log, buffer_list, item,
-						 trans->r_lsn);
 	case XFS_LI_INODE:
 		return xlog_recover_inode_pass2(log, buffer_list, item,
 						 trans->r_lsn);