From 200fd27c8fa2ba8bb4529033967b69a7cbfa2c2e Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Thu, 17 Mar 2016 14:41:59 +0800 Subject: [PATCH] ceph: use lookup request to revalidate dentry If dentry has no lease, ceph_d_revalidate() previously return 0. This causes VFS to invalidate the dentry and create a new dentry for later lookup. Invalidating a dentry also detach any underneath mount points. So mount point inside cephfs can disapear mystically (even the mount point is not modified by other hosts). The fix is using lookup request to revalidate dentry without lease. This can partly solve the mount points disapear issue (as long as the mount point is not modified by other hosts) Signed-off-by: Yan, Zheng --- fs/ceph/dir.c | 34 ++++++++++++++++++++++++++++++++++ fs/ceph/inode.c | 1 + 2 files changed, 35 insertions(+) diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index c37820b..d6c13f9 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -1111,6 +1111,40 @@ static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) valid = 1; } + if (!valid) { + struct ceph_mds_client *mdsc = + ceph_sb_to_client(dir->i_sb)->mdsc; + struct ceph_mds_request *req; + int op, mask, err; + + op = ceph_snap(dir) == CEPH_SNAPDIR ? + CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; + req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); + if (!IS_ERR(req)) { + req->r_dentry = dget(dentry); + req->r_num_caps = 2; + + mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; + if (ceph_security_xattr_wanted(dir)) + mask |= CEPH_CAP_XATTR_SHARED; + req->r_args.getattr.mask = mask; + + req->r_locked_dir = dir; + err = ceph_mdsc_do_request(mdsc, NULL, req); + if (err == 0 || err == -ENOENT) { + if (dentry == req->r_dentry) { + valid = !d_unhashed(dentry); + } else { + d_invalidate(req->r_dentry); + err = -EAGAIN; + } + } + ceph_mdsc_put_request(req); + dout("d_revalidate %p lookup result=%d\n", + dentry, err); + } + } + dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); if (valid) { ceph_dentry_lru_touch(dentry); diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 8b136dc..ed58b16 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -1265,6 +1265,7 @@ retry_lookup: dout(" %p links to %p %llx.%llx, not %llx.%llx\n", dn, d_inode(dn), ceph_vinop(d_inode(dn)), ceph_vinop(in)); + d_invalidate(dn); have_lease = false; } -- 2.7.4