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ceph: improve fragtree change detection 

check if number of splits in i_fragtree is equal to number of splits
in mds reply

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-05-04 11:40:30 +08:00 committed by Ilya Dryomov
parent a4b7431f39
commit 1b1bc16d66
2 changed files with 21 additions and 4 deletions
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24
fs/ceph/inode.c
View File

@ -326,13 +326,15 @@ static int ceph_fill_fragtree(struct inode *inode,
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_inode_frag *frag, *prev_frag = NULL;
struct rb_node *rb_node;
int i;
u32 id, nsplits;
unsigned i, split_by, nsplits;
u32 id;
bool update = false;
mutex_lock(&ci->i_fragtree_mutex);
nsplits = le32_to_cpu(fragtree->nsplits);
if (nsplits) {
if (nsplits != ci->i_fragtree_nsplits) {
update = true;
} else if (nsplits) {
i = prandom_u32() % nsplits;
id = le32_to_cpu(fragtree->splits[i].frag);
if (!__ceph_find_frag(ci, id))
@ -360,6 +362,13 @@ static int ceph_fill_fragtree(struct inode *inode,
rb_node = rb_first(&ci->i_fragtree);
for (i = 0; i < nsplits; i++) {
id = le32_to_cpu(fragtree->splits[i].frag);
split_by = le32_to_cpu(fragtree->splits[i].by);
if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
"frag %x split by %d\n", ceph_vinop(inode),
i, nsplits, id, split_by);
continue;
}
frag = NULL;
while (rb_node) {
frag = rb_entry(rb_node, struct ceph_inode_frag, node);
@ -375,6 +384,8 @@ static int ceph_fill_fragtree(struct inode *inode,
if (frag->split_by > 0 ||
!is_frag_child(frag->frag, prev_frag)) {
rb_erase(&frag->node, &ci->i_fragtree);
if (frag->split_by > 0)
ci->i_fragtree_nsplits--;
kfree(frag);
}
frag = NULL;
@ -384,7 +395,9 @@ static int ceph_fill_fragtree(struct inode *inode,
if (IS_ERR(frag))
continue;
}
frag->split_by = le32_to_cpu(fragtree->splits[i].by);
if (frag->split_by == 0)
ci->i_fragtree_nsplits++;
frag->split_by = split_by;
dout(" frag %x split by %d\n", frag->frag, frag->split_by);
prev_frag = frag;
}
@ -395,6 +408,8 @@ static int ceph_fill_fragtree(struct inode *inode,
if (frag->split_by > 0 ||
!is_frag_child(frag->frag, prev_frag)) {
rb_erase(&frag->node, &ci->i_fragtree);
if (frag->split_by > 0)
ci->i_fragtree_nsplits--;
kfree(frag);
}
}
@ -546,6 +561,7 @@ void ceph_destroy_inode(struct inode *inode)
rb_erase(n, &ci->i_fragtree);
kfree(frag);
}
ci->i_fragtree_nsplits = 0;
__ceph_destroy_xattrs(ci);
if (ci->i_xattrs.blob)

1
fs/ceph/super.h
View File

@ -297,6 +297,7 @@ struct ceph_inode_info {
u64 i_files, i_subdirs;
struct rb_root i_fragtree;
int i_fragtree_nsplits;
struct mutex i_fragtree_mutex;
struct ceph_inode_xattrs_info i_xattrs;