--- /dev/null
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/exportfs.h>
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+
+#include "super.h"
+#include "mds_client.h"
+
+/*
+ * Basic fh
+ */
+struct ceph_nfs_fh {
+ u64 ino;
+} __attribute__ ((packed));
+
+/*
+ * Larger fh that includes parent ino.
+ */
+struct ceph_nfs_confh {
+ u64 ino, parent_ino;
+} __attribute__ ((packed));
+
+static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
+ struct inode *parent_inode)
+{
+ int type;
+ struct ceph_nfs_fh *fh = (void *)rawfh;
+ struct ceph_nfs_confh *cfh = (void *)rawfh;
+ int connected_handle_length = sizeof(*cfh)/4;
+ int handle_length = sizeof(*fh)/4;
+
+ /* don't re-export snaps */
+ if (ceph_snap(inode) != CEPH_NOSNAP)
+ return -EINVAL;
+
+ if (parent_inode && (*max_len < connected_handle_length)) {
+ *max_len = connected_handle_length;
+ return FILEID_INVALID;
+ } else if (*max_len < handle_length) {
+ *max_len = handle_length;
+ return FILEID_INVALID;
+ }
+
+ if (parent_inode) {
+ dout("encode_fh %llx with parent %llx\n",
+ ceph_ino(inode), ceph_ino(parent_inode));
+ cfh->ino = ceph_ino(inode);
+ cfh->parent_ino = ceph_ino(parent_inode);
+ *max_len = connected_handle_length;
+ type = FILEID_INO32_GEN_PARENT;
+ } else {
+ dout("encode_fh %llx\n", ceph_ino(inode));
+ fh->ino = ceph_ino(inode);
+ *max_len = handle_length;
+ type = FILEID_INO32_GEN;
+ }
+ return type;
+}
+
+static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
+{
+ struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
+ struct inode *inode;
+ struct dentry *dentry;
+ struct ceph_vino vino;
+ int err;
+
+ vino.ino = ino;
+ vino.snap = CEPH_NOSNAP;
+ inode = ceph_find_inode(sb, vino);
+ if (!inode) {
+ struct ceph_mds_request *req;
+
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
+ USE_ANY_MDS);
+ if (IS_ERR(req))
+ return ERR_CAST(req);
+
+ req->r_ino1 = vino;
+ 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(-ESTALE);
+ }
+
+ 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("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
+ return dentry;
+}
+
+/*
+ * convert regular fh to dentry
+ */
+static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
+ struct fid *fid,
+ int fh_len, int fh_type)
+{
+ struct ceph_nfs_fh *fh = (void *)fid->raw;
+
+ if (fh_type != FILEID_INO32_GEN &&
+ fh_type != FILEID_INO32_GEN_PARENT)
+ return NULL;
+ if (fh_len < sizeof(*fh) / 4)
+ return NULL;
+
+ dout("fh_to_dentry %llx\n", 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 = d_inode(child);
+ ihold(d_inode(child));
+ } 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(d_inode(child)) : ino,
+ dentry, ceph_vinop(inode));
+ return dentry;
+}
+
+static struct dentry *ceph_get_parent(struct dentry *child)
+{
+ /* don't re-export snaps */
+ if (ceph_snap(d_inode(child)) != CEPH_NOSNAP)
+ return ERR_PTR(-EINVAL);
+
+ dout("get_parent %p ino %llx.%llx\n",
+ child, ceph_vinop(d_inode(child)));
+ return __get_parent(child->d_sb, child, 0);
+}
+
+/*
+ * convert regular fh to parent
+ */
+static struct dentry *ceph_fh_to_parent(struct super_block *sb,
+ struct fid *fid,
+ int fh_len, int fh_type)
+{
+ struct ceph_nfs_confh *cfh = (void *)fid->raw;
+ struct dentry *dentry;
+
+ if (fh_type != FILEID_INO32_GEN_PARENT)
+ return NULL;
+ if (fh_len < sizeof(*cfh) / 4)
+ return NULL;
+
+ dout("fh_to_parent %llx\n", cfh->parent_ino);
+ dentry = __get_parent(sb, NULL, cfh->ino);
+ if (IS_ERR(dentry) && PTR_ERR(dentry) == -ENOENT)
+ dentry = __fh_to_dentry(sb, cfh->parent_ino);
+ return dentry;
+}
+
+static int ceph_get_name(struct dentry *parent, char *name,
+ struct dentry *child)
+{
+ struct ceph_mds_client *mdsc;
+ struct ceph_mds_request *req;
+ int err;
+
+ mdsc = ceph_inode_to_client(d_inode(child))->mdsc;
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
+ USE_ANY_MDS);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ mutex_lock(&d_inode(parent)->i_mutex);
+
+ req->r_inode = d_inode(child);
+ ihold(d_inode(child));
+ req->r_ino2 = ceph_vino(d_inode(parent));
+ req->r_locked_dir = d_inode(parent);
+ req->r_num_caps = 2;
+ err = ceph_mdsc_do_request(mdsc, NULL, req);
+
+ mutex_unlock(&d_inode(parent)->i_mutex);
+
+ if (!err) {
+ struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
+ memcpy(name, rinfo->dname, rinfo->dname_len);
+ name[rinfo->dname_len] = 0;
+ dout("get_name %p ino %llx.%llx name %s\n",
+ child, ceph_vinop(d_inode(child)), name);
+ } else {
+ dout("get_name %p ino %llx.%llx err %d\n",
+ child, ceph_vinop(d_inode(child)), err);
+ }
+
+ ceph_mdsc_put_request(req);
+ return err;
+}
+
+const struct export_operations ceph_export_ops = {
+ .encode_fh = ceph_encode_fh,
+ .fh_to_dentry = ceph_fh_to_dentry,
+ .fh_to_parent = ceph_fh_to_parent,
+ .get_parent = ceph_get_parent,
+ .get_name = ceph_get_name,
+};
Code Review / kvmfornfv.git / blobdiff