#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 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;		int mask; 		req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,					       USE_ANY_MDS);		if (IS_ERR(req))			return ERR_CAST(req); 		mask = CEPH_STAT_CAP_INODE;		if (ceph_security_xattr_wanted(d_inode(sb->s_root)))			mask |= CEPH_CAP_XATTR_SHARED;		req->r_args.getattr.mask = cpu_to_le32(mask); 		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);		if (inode->i_nlink == 0) {			iput(inode);			return ERR_PTR(-ESTALE);		}	} 	return d_obtain_alias(inode);} /* * 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;	int mask;	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,		};	} 	mask = CEPH_STAT_CAP_INODE;	if (ceph_security_xattr_wanted(d_inode(sb->s_root)))		mask |= CEPH_CAP_XATTR_SHARED;	req->r_args.getattr.mask = cpu_to_le32(mask); 	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); 	return d_obtain_alias(inode);} 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 (unlikely(dentry == ERR_PTR(-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); 	inode_lock(d_inode(parent)); 	req->r_inode = d_inode(child);	ihold(d_inode(child));	req->r_ino2 = ceph_vino(d_inode(parent));	req->r_parent = d_inode(parent);	set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);	req->r_num_caps = 2;	err = ceph_mdsc_do_request(mdsc, NULL, req); 	inode_unlock(d_inode(parent)); 	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,};