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ceph: use lookup request to revalidate dentry

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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 <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-03-17 14:41:59 +08:00 committed by Ilya Dryomov
parent 641235d8f8
commit 200fd27c8f
2 changed files with 35 additions and 0 deletions
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34
fs/ceph/dir.c
View File

@ -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);

1
fs/ceph/inode.c
View File

@ -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;
}