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ceph: add get_parent() NFS export callback 

The callback uses LOOKUPPARENT MDS request to find parent.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Yan, Zheng 2014-03-01 22:11:45 +08:00
parent 4f32b42dca
commit 9017c2ec78
1 changed files with 60 additions and 0 deletions
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60
fs/ceph/export.c
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@ -121,6 +121,65 @@ static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
return __fh_to_dentry(sb, fh->ino); return __fh_to_dentry(sb, fh->ino);
} }
static struct dentry *__get_parent(struct super_block *sb,
struct dentry *child, u64 ino)
{
struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
struct ceph_mds_request *req;
struct inode *inode;
struct dentry *dentry;
int err;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
USE_ANY_MDS);
if (IS_ERR(req))
return ERR_CAST(req);
if (child) {
req->r_inode = child->d_inode;
ihold(child->d_inode);
} else {
req->r_ino1 = (struct ceph_vino) {
.ino = ino,
.snap = CEPH_NOSNAP,
};
}
req->r_num_caps = 1;
err = ceph_mdsc_do_request(mdsc, NULL, req);
inode = req->r_target_inode;
if (inode)
ihold(inode);
ceph_mdsc_put_request(req);
if (!inode)
return ERR_PTR(-ENOENT);
dentry = d_obtain_alias(inode);
if (IS_ERR(dentry)) {
iput(inode);
return dentry;
}
err = ceph_init_dentry(dentry);
if (err < 0) {
dput(dentry);
return ERR_PTR(err);
}
dout("__get_parent ino %llx parent %p ino %llx.%llx\n",
child ? ceph_ino(child->d_inode) : ino,
dentry, ceph_vinop(inode));
return dentry;
}
struct dentry *ceph_get_parent(struct dentry *child)
{
/* don't re-export snaps */
if (ceph_snap(child->d_inode) != CEPH_NOSNAP)
return ERR_PTR(-EINVAL);
dout("get_parent %p ino %llx.%llx\n",
child, ceph_vinop(child->d_inode));
return __get_parent(child->d_sb, child, 0);
}
/* /*
* get parent, if possible. * get parent, if possible.
* *
@ -171,4 +230,5 @@ const struct export_operations ceph_export_ops = {
.encode_fh = ceph_encode_fh, .encode_fh = ceph_encode_fh,
.fh_to_dentry = ceph_fh_to_dentry, .fh_to_dentry = ceph_fh_to_dentry,
.fh_to_parent = ceph_fh_to_parent, .fh_to_parent = ceph_fh_to_parent,
.get_parent = ceph_get_parent,
}; };