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xfs: handle zero entries case in xfs_iext_rebalance_leaf

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And also rename fill to nr_entries to match the rest of the code.

Reported-by: Brian Foster <bfoster@redhat.com>
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 2017-11-09 09:11:43 -08:00 committed by Darrick J. Wong
parent 3e27c418a7
commit ae82968ee9
1 changed files with 17 additions and 7 deletions
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24
fs/xfs/libxfs/xfs_iext_tree.c
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@ -787,13 +787,21 @@ xfs_iext_rebalance_leaf(
struct xfs_iext_cursor *cur,
struct xfs_iext_leaf *leaf,
xfs_fileoff_t offset,
int fill)
int nr_entries)
{
/*
* If the neighbouring nodes are completely full we might never be able
* to merge our node, and will only delete it once the number of
* entries hits zero.
*/
if (nr_entries == 0)
goto remove_node;
if (leaf->prev) {
int nr_prev = xfs_iext_leaf_nr_entries(ifp, leaf->prev, 0), i;
if (nr_prev + fill <= RECS_PER_LEAF) {
for (i = 0; i < fill; i++)
if (nr_prev + nr_entries <= RECS_PER_LEAF) {
for (i = 0; i < nr_entries; i++)
leaf->prev->recs[nr_prev + i] = leaf->recs[i];
if (cur->leaf == leaf) {
@ -807,18 +815,20 @@ xfs_iext_rebalance_leaf(
if (leaf->next) {
int nr_next = xfs_iext_leaf_nr_entries(ifp, leaf->next, 0), i;
if (fill + nr_next <= RECS_PER_LEAF) {
if (nr_entries + nr_next <= RECS_PER_LEAF) {
/*
* Merge the next node into this node so that we don't
* have to do an additional update of the keys in the
* higher levels.
*/
for (i = 0; i < nr_next; i++)
leaf->recs[fill + i] = leaf->next->recs[i];
for (i = 0; i < nr_next; i++) {
leaf->recs[nr_entries + i] =
leaf->next->recs[i];
}
if (cur->leaf == leaf->next) {
cur->leaf = leaf;
cur->pos += fill;
cur->pos += nr_entries;
}
offset = xfs_iext_leaf_key(leaf->next, 0);