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#ifndef CEPH_CLIENT_DENTRY_H
#define CEPH_CLIENT_DENTRY_H
#include "include/lru.h"
#include "include/xlist.h"
#include "mds/mdstypes.h"
#include "Inode.h"
#include "InodeRef.h"
#include "Dir.h"
class Dentry : public LRUObject {
public:
explicit Dentry(Dir *_dir, const std::string &_name) :
dir(_dir), name(_name), inode_xlist_link(this)
{
auto r = dir->dentries.insert(make_pair(name, this));
ceph_assert(r.second);
dir->num_null_dentries++;
}
~Dentry() {
ceph_assert(ref == 0);
ceph_assert(dir == nullptr);
}
/*
* ref==1 -> cached, unused
* ref >1 -> pinned in lru
*/
void get() {
ceph_assert(ref > 0);
if (++ref == 2)
lru_pin();
//cout << "dentry.get on " << this << " " << name << " now " << ref << std::endl;
}
void put() {
ceph_assert(ref > 0);
if (--ref == 1)
lru_unpin();
//cout << "dentry.put on " << this << " " << name << " now " << ref << std::endl;
if (ref == 0)
delete this;
}
void link(InodeRef in) {
inode = in;
inode->dentries.push_back(&inode_xlist_link);
if (inode->is_dir()) {
if (inode->dir)
get(); // dir -> dn pin
if (inode->ll_ref)
get(); // ll_ref -> dn pin
}
dir->num_null_dentries--;
}
void unlink(void) {
if (inode->is_dir()) {
if (inode->dir)
put(); // dir -> dn pin
if (inode->ll_ref)
put(); // ll_ref -> dn pin
}
ceph_assert(inode_xlist_link.get_list() == &inode->dentries);
inode_xlist_link.remove_myself();
inode.reset();
dir->num_null_dentries++;
}
void mark_primary() {
if (inode && inode->dentries.front() != this)
inode->dentries.push_front(&inode_xlist_link);
}
void detach(void) {
ceph_assert(!inode);
auto p = dir->dentries.find(name);
ceph_assert(p != dir->dentries.end());
dir->dentries.erase(p);
dir->num_null_dentries--;
dir = nullptr;
}
void dump(Formatter *f) const;
friend std::ostream &operator<<(std::ostream &oss, const Dentry &Dentry);
Dir *dir;
const string name;
InodeRef inode;
int ref = 1; // 1 if there's a dir beneath me.
int64_t offset = 0;
mds_rank_t lease_mds = -1;
utime_t lease_ttl;
uint64_t lease_gen = 0;
ceph_seq_t lease_seq = 0;
int cap_shared_gen = 0;
std::string alternate_name;
private:
xlist<Dentry *>::item inode_xlist_link;
};
#endif
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