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ceph: keep leaf frag when updating fragtree 

Nodes in i_fragtree are sorted according to ceph_compare_frag().
It means frag node in i_fragtree always follow its direct parent
node. To check if a leaf node is valid, we just need to check if
it's child of previous split node.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-05-04 11:05:10 +08:00 committed by Ilya Dryomov
parent 421721195a
commit a4b7431f39
1 changed files with 23 additions and 5 deletions
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28
fs/ceph/inode.c
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@ -310,12 +310,21 @@ static int frag_tree_split_cmp(const void *l, const void *r)
return ceph_frag_compare(ls->frag, rs->frag);
}
static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
{
if (!frag)
return f == ceph_frag_make(0, 0);
if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
return false;
return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
}
static int ceph_fill_fragtree(struct inode *inode,
struct ceph_frag_tree_head *fragtree,
struct ceph_mds_reply_dirfrag *dirinfo)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_inode_frag *frag;
struct ceph_inode_frag *frag, *prev_frag = NULL;
struct rb_node *rb_node;
int i;
u32 id, nsplits;
@ -362,8 +371,12 @@ static int ceph_fill_fragtree(struct inode *inode,
break;
}
rb_node = rb_next(rb_node);
rb_erase(&frag->node, &ci->i_fragtree);
kfree(frag);
/* delete stale split/leaf node */
if (frag->split_by > 0 ||
!is_frag_child(frag->frag, prev_frag)) {
rb_erase(&frag->node, &ci->i_fragtree);
kfree(frag);
}
frag = NULL;
}
if (!frag) {
@ -373,12 +386,17 @@ static int ceph_fill_fragtree(struct inode *inode,
}
frag->split_by = le32_to_cpu(fragtree->splits[i].by);
dout(" frag %x split by %d\n", frag->frag, frag->split_by);
prev_frag = frag;
}
while (rb_node) {
frag = rb_entry(rb_node, struct ceph_inode_frag, node);
rb_node = rb_next(rb_node);
rb_erase(&frag->node, &ci->i_fragtree);
kfree(frag);
/* delete stale split/leaf node */
if (frag->split_by > 0 ||
!is_frag_child(frag->frag, prev_frag)) {
rb_erase(&frag->node, &ci->i_fragtree);
kfree(frag);
}
}
out_unlock:
mutex_unlock(&ci->i_fragtree_mutex);