336 lines
8.5 KiB
C
336 lines
8.5 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see
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* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 2011, 2012, Intel Corporation.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Sun Microsystems, Inc.
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*
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* lustre/lustre/llite/llite_nfs.c
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*
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* NFS export of Lustre Light File System
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*
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* Author: Yury Umanets <umka@clusterfs.com>
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* Author: Huang Hua <huanghua@clusterfs.com>
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*/
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#define DEBUG_SUBSYSTEM S_LLITE
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#include "../include/lustre_lite.h"
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#include "llite_internal.h"
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#include <linux/exportfs.h>
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__u32 get_uuid2int(const char *name, int len)
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{
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__u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
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while (len--) {
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__u32 key = key1 + (key0 ^ (*name++ * 7152373));
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if (key & 0x80000000)
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key -= 0x7fffffff;
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key1 = key0;
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key0 = key;
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}
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return (key0 << 1);
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}
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void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
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{
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__u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
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while (len--) {
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key = key1 + (key0 ^ (*name++ * 7152373));
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if (key & 0x8000000000000000ULL)
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key -= 0x7fffffffffffffffULL;
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key1 = key0;
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key0 = key;
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}
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fsid->val[0] = key;
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fsid->val[1] = key >> 32;
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}
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static int ll_nfs_test_inode(struct inode *inode, void *opaque)
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{
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return lu_fid_eq(&ll_i2info(inode)->lli_fid,
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(struct lu_fid *)opaque);
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}
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struct inode *search_inode_for_lustre(struct super_block *sb,
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const struct lu_fid *fid)
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{
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struct ll_sb_info *sbi = ll_s2sbi(sb);
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struct ptlrpc_request *req = NULL;
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struct inode *inode = NULL;
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int eadatalen = 0;
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unsigned long hash = cl_fid_build_ino(fid,
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ll_need_32bit_api(sbi));
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struct md_op_data *op_data;
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int rc;
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CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
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inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
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if (inode)
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return inode;
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rc = ll_get_default_mdsize(sbi, &eadatalen);
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if (rc)
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return ERR_PTR(rc);
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/* Because inode is NULL, ll_prep_md_op_data can not
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* be used here. So we allocate op_data ourselves */
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op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
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if (!op_data)
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return ERR_PTR(-ENOMEM);
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op_data->op_fid1 = *fid;
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op_data->op_mode = eadatalen;
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op_data->op_valid = OBD_MD_FLEASIZE;
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/* mds_fid2dentry ignores f_type */
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rc = md_getattr(sbi->ll_md_exp, op_data, &req);
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OBD_FREE_PTR(op_data);
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if (rc) {
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CERROR("can't get object attrs, fid "DFID", rc %d\n",
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PFID(fid), rc);
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return ERR_PTR(rc);
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}
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rc = ll_prep_inode(&inode, req, sb, NULL);
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ptlrpc_req_finished(req);
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if (rc)
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return ERR_PTR(rc);
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return inode;
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}
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struct lustre_nfs_fid {
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struct lu_fid lnf_child;
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struct lu_fid lnf_parent;
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};
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static struct dentry *
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ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
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{
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struct inode *inode;
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struct dentry *result;
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CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
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if (!fid_is_sane(fid))
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return ERR_PTR(-ESTALE);
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inode = search_inode_for_lustre(sb, fid);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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if (is_bad_inode(inode)) {
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/* we didn't find the right inode.. */
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iput(inode);
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return ERR_PTR(-ESTALE);
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}
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/**
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* It is an anonymous dentry without OST objects created yet.
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* We have to find the parent to tell MDS how to init lov objects.
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*/
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if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
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parent != NULL) {
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struct ll_inode_info *lli = ll_i2info(inode);
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spin_lock(&lli->lli_lock);
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lli->lli_pfid = *parent;
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spin_unlock(&lli->lli_lock);
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}
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result = d_obtain_alias(inode);
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if (IS_ERR(result)) {
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iput(inode);
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return result;
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}
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return result;
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}
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#define LUSTRE_NFS_FID 0x97
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/**
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* \a connectable - is nfsd will connect himself or this should be done
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* at lustre
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*
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* The return value is file handle type:
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* 1 -- contains child file handle;
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* 2 -- contains child file handle and parent file handle;
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* 255 -- error.
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*/
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static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
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struct inode *parent)
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{
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struct lustre_nfs_fid *nfs_fid = (void *)fh;
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CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
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inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
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(int)sizeof(struct lustre_nfs_fid));
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if (*plen < sizeof(struct lustre_nfs_fid) / 4)
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return 255;
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nfs_fid->lnf_child = *ll_inode2fid(inode);
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nfs_fid->lnf_parent = *ll_inode2fid(parent);
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*plen = sizeof(struct lustre_nfs_fid) / 4;
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return LUSTRE_NFS_FID;
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}
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static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name,
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int namelen, loff_t hash, u64 ino,
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unsigned type)
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{
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/* It is hack to access lde_fid for comparison with lgd_fid.
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* So the input 'name' must be part of the 'lu_dirent'. */
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struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
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struct ll_getname_data *lgd =
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container_of(ctx, struct ll_getname_data, ctx);
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struct lu_fid fid;
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fid_le_to_cpu(&fid, &lde->lde_fid);
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if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
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memcpy(lgd->lgd_name, name, namelen);
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lgd->lgd_name[namelen] = 0;
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lgd->lgd_found = 1;
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}
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return lgd->lgd_found;
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}
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static int ll_get_name(struct dentry *dentry, char *name,
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struct dentry *child)
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{
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struct inode *dir = dentry->d_inode;
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int rc;
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struct ll_getname_data lgd = {
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.lgd_name = name,
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.lgd_fid = ll_i2info(child->d_inode)->lli_fid,
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.ctx.actor = ll_nfs_get_name_filldir,
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};
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if (!dir || !S_ISDIR(dir->i_mode)) {
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rc = -ENOTDIR;
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goto out;
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}
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if (!dir->i_fop) {
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rc = -EINVAL;
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goto out;
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}
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mutex_lock(&dir->i_mutex);
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rc = ll_dir_read(dir, &lgd.ctx);
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mutex_unlock(&dir->i_mutex);
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if (!rc && !lgd.lgd_found)
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rc = -ENOENT;
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out:
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return rc;
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}
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static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type)
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{
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struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
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if (fh_type != LUSTRE_NFS_FID)
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return ERR_PTR(-EPROTO);
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return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
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}
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static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type)
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{
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struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
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if (fh_type != LUSTRE_NFS_FID)
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return ERR_PTR(-EPROTO);
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return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
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}
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static struct dentry *ll_get_parent(struct dentry *dchild)
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{
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struct ptlrpc_request *req = NULL;
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struct inode *dir = dchild->d_inode;
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struct ll_sb_info *sbi;
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struct dentry *result = NULL;
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struct mdt_body *body;
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static char dotdot[] = "..";
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struct md_op_data *op_data;
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int rc;
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int lmmsize;
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LASSERT(dir && S_ISDIR(dir->i_mode));
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sbi = ll_s2sbi(dir->i_sb);
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CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
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dir->i_ino, PFID(ll_inode2fid(dir)));
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rc = ll_get_default_mdsize(sbi, &lmmsize);
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if (rc != 0)
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return ERR_PTR(rc);
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op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
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strlen(dotdot), lmmsize,
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LUSTRE_OPC_ANY, NULL);
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if (IS_ERR(op_data))
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return (void *)op_data;
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rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
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ll_finish_md_op_data(op_data);
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if (rc) {
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CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
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return ERR_PTR(rc);
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}
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body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
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LASSERT(body->valid & OBD_MD_FLID);
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CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
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PFID(ll_inode2fid(dir)), PFID(&body->fid1));
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result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
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ptlrpc_req_finished(req);
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return result;
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}
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struct export_operations lustre_export_operations = {
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.get_parent = ll_get_parent,
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.encode_fh = ll_encode_fh,
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.get_name = ll_get_name,
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.fh_to_dentry = ll_fh_to_dentry,
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.fh_to_parent = ll_fh_to_parent,
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};
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