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xfs: refactor xfs_bmap_add_extent_hole_delay 

Use xfs_iext_get_extent to find, and xfs_iext_update_extent to update
entries in the in-core extent list.  This isolates the function from
the detailed layout of the extent list, and generally makes the code
a lot more readable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2017-10-17 14:16:23 -07:00 committed by Darrick J. Wong
parent 48fd52b16d
commit 3ffc18ecd3
1 changed files with 11 additions and 10 deletions
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21
fs/xfs/libxfs/xfs_bmap.c
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@ -2688,7 +2688,7 @@ xfs_bmap_add_extent_hole_delay(
xfs_filblks_t oldlen=0; /* old indirect size */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
int state; /* state bits, accessed thru macros */
xfs_filblks_t temp=0; /* temp for indirect calculations */
xfs_filblks_t temp; /* temp for indirect calculations */
ifp = XFS_IFORK_PTR(ip, whichfork);
state = 0;
@ -2751,14 +2751,14 @@ xfs_bmap_add_extent_hole_delay(
right.br_blockcount;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
nullstartblock((int)newlen));
left.br_startblock = nullstartblock(newlen);
left.br_blockcount = temp;
xfs_iext_update_extent(ifp, *idx, &left);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
xfs_iext_remove(ip, *idx + 1, 1, state);
@ -2774,13 +2774,13 @@ xfs_bmap_add_extent_hole_delay(
temp = left.br_blockcount + new->br_blockcount;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
nullstartblock((int)newlen));
left.br_blockcount = temp;
left.br_startblock = nullstartblock(newlen);
xfs_iext_update_extent(ifp, *idx, &left);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
break;
@ -2796,9 +2796,10 @@ xfs_bmap_add_extent_hole_delay(
startblockval(right.br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
new->br_startoff,
nullstartblock((int)newlen), temp, right.br_state);
right.br_startoff = new->br_startoff;
right.br_startblock = nullstartblock(newlen);
right.br_blockcount = temp;
xfs_iext_update_extent(ifp, *idx, &right);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
break;