From 0d045540ed57e68b9ddcf5c325279a7e5ede7bbf Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 3 Nov 2017 10:34:39 -0700 Subject: [PATCH] xfs: treat idx as a cursor in xfs_bmap_add_extent_delay_real Stop poking before and after the index and just increment or decrement it while doing our operations on it to prepare for a new extent list implementation. Signed-off-by: Christoph Hellwig Reviewed-by: Brian Foster Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- fs/xfs/libxfs/xfs_bmap.c | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index e1d61fa..c0216e9 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -1648,12 +1648,13 @@ xfs_bmap_add_extent_delay_real( * Filling in all of a previously delayed allocation extent. * The left and right neighbors are both contiguous with new. */ - bma->idx--; LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount; - xfs_iext_update_extent(bma->ip, state, bma->idx, &LEFT); - xfs_iext_remove(bma->ip, bma->idx + 1, 2, state); + xfs_iext_remove(bma->ip, bma->idx, 2, state); + bma->idx--; + xfs_iext_update_extent(bma->ip, state, bma->idx, &LEFT); (*nextents)--; + if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { @@ -1681,13 +1682,13 @@ xfs_bmap_add_extent_delay_real( * Filling in all of a previously delayed allocation extent. * The left neighbor is contiguous, the right is not. */ - bma->idx--; - old = LEFT; LEFT.br_blockcount += PREV.br_blockcount; + + xfs_iext_remove(bma->ip, bma->idx, 1, state); + bma->idx--; xfs_iext_update_extent(bma->ip, state, bma->idx, &LEFT); - xfs_iext_remove(bma->ip, bma->idx + 1, 1, state); if (bma->cur == NULL) rval = XFS_ILOG_DEXT; else { @@ -1709,9 +1710,12 @@ xfs_bmap_add_extent_delay_real( */ PREV.br_startblock = new->br_startblock; PREV.br_blockcount += RIGHT.br_blockcount; + + bma->idx++; + xfs_iext_remove(bma->ip, bma->idx, 1, state); + bma->idx--; xfs_iext_update_extent(bma->ip, state, bma->idx, &PREV); - xfs_iext_remove(bma->ip, bma->idx + 1, 1, state); if (bma->cur == NULL) rval = XFS_ILOG_DEXT; else { @@ -1763,12 +1767,14 @@ xfs_bmap_add_extent_delay_real( startblockval(PREV.br_startblock)); LEFT.br_blockcount += new->br_blockcount; - xfs_iext_update_extent(bma->ip, state, bma->idx - 1, &LEFT); PREV.br_blockcount = temp; PREV.br_startoff += new->br_blockcount; PREV.br_startblock = nullstartblock(da_new); + xfs_iext_update_extent(bma->ip, state, bma->idx, &PREV); + bma->idx--; + xfs_iext_update_extent(bma->ip, state, bma->idx, &LEFT); if (bma->cur == NULL) rval = XFS_ILOG_DEXT; @@ -1783,7 +1789,6 @@ xfs_bmap_add_extent_delay_real( goto done; } - bma->idx--; break; case BMAP_LEFT_FILLING: @@ -1836,7 +1841,6 @@ xfs_bmap_add_extent_delay_real( RIGHT.br_startoff = new->br_startoff; RIGHT.br_startblock = new->br_startblock; RIGHT.br_blockcount += new->br_blockcount; - xfs_iext_update_extent(bma->ip, state, bma->idx + 1, &RIGHT); if (bma->cur == NULL) rval = XFS_ILOG_DEXT; @@ -1857,9 +1861,10 @@ xfs_bmap_add_extent_delay_real( PREV.br_blockcount = temp; PREV.br_startblock = nullstartblock(da_new); - xfs_iext_update_extent(bma->ip, state, bma->idx, &PREV); + xfs_iext_update_extent(bma->ip, state, bma->idx, &PREV); bma->idx++; + xfs_iext_update_extent(bma->ip, state, bma->idx, &RIGHT); break; case BMAP_RIGHT_FILLING: -- 2.7.4