drivers/staging/lustre/lustre/llite/llite_nfs.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/lustre/llite/llite_nfs.c
  37  *
  38  * NFS export of Lustre Light File System
  39  *
  40  * Author: Yury Umanets <umka@clusterfs.com>
  41  * Author: Huang Hua <huanghua@clusterfs.com>
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_LLITE
  45 #include "../include/lustre_lite.h"
  46 #include "llite_internal.h"
  47 #include <linux/exportfs.h>
  48
  49 __u32 get_uuid2int(const char *name, int len)
  50 {
  51         __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
  52
  53         while (len--) {
  54                 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
  55
  56                 if (key & 0x80000000)
  57                         key -= 0x7fffffff;
  58                 key1 = key0;
  59                 key0 = key;
  60         }
  61         return (key0 << 1);
  62 }
  63
  64 void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
  65 {
  66         __u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
  67
  68         while (len--) {
  69                 key = key1 + (key0 ^ (*name++ * 7152373));
  70                 if (key & 0x8000000000000000ULL)
  71                         key -= 0x7fffffffffffffffULL;
  72                 key1 = key0;
  73                 key0 = key;
  74         }
  75
  76         fsid->val[0] = key;
  77         fsid->val[1] = key >> 32;
  78 }
  79
  80 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
  81 {
  82         return lu_fid_eq(&ll_i2info(inode)->lli_fid, opaque);
  83 }
  84
  85 struct inode *search_inode_for_lustre(struct super_block *sb,
  86                                       const struct lu_fid *fid)
  87 {
  88         struct ll_sb_info     *sbi = ll_s2sbi(sb);
  89         struct ptlrpc_request *req = NULL;
  90         struct inode      *inode = NULL;
  91         int                eadatalen = 0;
  92         unsigned long         hash = cl_fid_build_ino(fid,
  93                                                       ll_need_32bit_api(sbi));
  94         struct  md_op_data    *op_data;
  95         int                rc;
  96
  97         CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
  98
  99         inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
 100         if (inode)
 101                 return inode;
 102
 103         rc = ll_get_default_mdsize(sbi, &eadatalen);
 104         if (rc)
 105                 return ERR_PTR(rc);
 106
 107         /* Because inode is NULL, ll_prep_md_op_data can not
 108          * be used here. So we allocate op_data ourselves */
 109         op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
 110         if (!op_data)
 111                 return ERR_PTR(-ENOMEM);
 112
 113         op_data->op_fid1 = *fid;
 114         op_data->op_mode = eadatalen;
 115         op_data->op_valid = OBD_MD_FLEASIZE;
 116
 117         /* mds_fid2dentry ignores f_type */
 118         rc = md_getattr(sbi->ll_md_exp, op_data, &req);
 119         kfree(op_data);
 120         if (rc) {
 121                 CERROR("can't get object attrs, fid "DFID", rc %d\n",
 122                        PFID(fid), rc);
 123                 return ERR_PTR(rc);
 124         }
 125         rc = ll_prep_inode(&inode, req, sb, NULL);
 126         ptlrpc_req_finished(req);
 127         if (rc)
 128                 return ERR_PTR(rc);
 129
 130         return inode;
 131 }
 132
 133 struct lustre_nfs_fid {
 134         struct lu_fid   lnf_child;
 135         struct lu_fid   lnf_parent;
 136 };
 137
 138 static struct dentry *
 139 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
 140 {
 141         struct inode  *inode;
 142         struct dentry *result;
 143
 144         CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
 145         if (!fid_is_sane(fid))
 146                 return ERR_PTR(-ESTALE);
 147
 148         inode = search_inode_for_lustre(sb, fid);
 149         if (IS_ERR(inode))
 150                 return ERR_CAST(inode);
 151
 152         if (is_bad_inode(inode)) {
 153                 /* we didn't find the right inode.. */
 154                 iput(inode);
 155                 return ERR_PTR(-ESTALE);
 156         }
 157
 158         /**
 159          * It is an anonymous dentry without OST objects created yet.
 160          * We have to find the parent to tell MDS how to init lov objects.
 161          */
 162         if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
 163             parent != NULL) {
 164                 struct ll_inode_info *lli = ll_i2info(inode);
 165
 166                 spin_lock(&lli->lli_lock);
 167                 lli->lli_pfid = *parent;
 168                 spin_unlock(&lli->lli_lock);
 169         }
 170
 171         /* N.B. d_obtain_alias() drops inode ref on error */
 172         result = d_obtain_alias(inode);
 173
 174         return result;
 175 }
 176
 177 #define LUSTRE_NFS_FID    0x97
 178
 179 /**
 180  * \a connectable - is nfsd will connect himself or this should be done
 181  *                at lustre
 182  *
 183  * The return value is file handle type:
 184  * 1 -- contains child file handle;
 185  * 2 -- contains child file handle and parent file handle;
 186  * 255 -- error.
 187  */
 188 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
 189                         struct inode *parent)
 190 {
 191         struct lustre_nfs_fid *nfs_fid = (void *)fh;
 192
 193         CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
 194               inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
 195               (int)sizeof(struct lustre_nfs_fid));
 196
 197         if (*plen < sizeof(struct lustre_nfs_fid) / 4)
 198                 return 255;
 199
 200         nfs_fid->lnf_child = *ll_inode2fid(inode);
 201         nfs_fid->lnf_parent = *ll_inode2fid(parent);
 202         *plen = sizeof(struct lustre_nfs_fid) / 4;
 203
 204         return LUSTRE_NFS_FID;
 205 }
 206
 207 static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name,
 208                                    int namelen, loff_t hash, u64 ino,
 209                                    unsigned type)
 210 {
 211         /* It is hack to access lde_fid for comparison with lgd_fid.
 212          * So the input 'name' must be part of the 'lu_dirent'. */
 213         struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
 214         struct ll_getname_data *lgd =
 215                 container_of(ctx, struct ll_getname_data, ctx);
 216         struct lu_fid fid;
 217
 218         fid_le_to_cpu(&fid, &lde->lde_fid);
 219         if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
 220                 memcpy(lgd->lgd_name, name, namelen);
 221                 lgd->lgd_name[namelen] = 0;
 222                 lgd->lgd_found = 1;
 223         }
 224         return lgd->lgd_found;
 225 }
 226
 227 static int ll_get_name(struct dentry *dentry, char *name,
 228                        struct dentry *child)
 229 {
 230         struct inode *dir = d_inode(dentry);
 231         int rc;
 232         struct ll_getname_data lgd = {
 233                 .lgd_name = name,
 234                 .lgd_fid = ll_i2info(d_inode(child))->lli_fid,
 235                 .ctx.actor = ll_nfs_get_name_filldir,
 236         };
 237
 238         if (!dir || !S_ISDIR(dir->i_mode)) {
 239                 rc = -ENOTDIR;
 240                 goto out;
 241         }
 242
 243         if (!dir->i_fop) {
 244                 rc = -EINVAL;
 245                 goto out;
 246         }
 247
 248         inode_lock(dir);
 249         rc = ll_dir_read(dir, &lgd.ctx);
 250         inode_unlock(dir);
 251         if (!rc && !lgd.lgd_found)
 252                 rc = -ENOENT;
 253 out:
 254         return rc;
 255 }
 256
 257 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
 258                                       int fh_len, int fh_type)
 259 {
 260         struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
 261
 262         if (fh_type != LUSTRE_NFS_FID)
 263                 return ERR_PTR(-EPROTO);
 264
 265         return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
 266 }
 267
 268 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
 269                                       int fh_len, int fh_type)
 270 {
 271         struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
 272
 273         if (fh_type != LUSTRE_NFS_FID)
 274                 return ERR_PTR(-EPROTO);
 275
 276         return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
 277 }
 278
 279 static struct dentry *ll_get_parent(struct dentry *dchild)
 280 {
 281         struct ptlrpc_request *req = NULL;
 282         struct inode      *dir = d_inode(dchild);
 283         struct ll_sb_info     *sbi;
 284         struct dentry    *result = NULL;
 285         struct mdt_body       *body;
 286         static char        dotdot[] = "..";
 287         struct md_op_data     *op_data;
 288         int                rc;
 289         int                   lmmsize;
 290
 291         LASSERT(dir && S_ISDIR(dir->i_mode));
 292
 293         sbi = ll_s2sbi(dir->i_sb);
 294
 295         CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
 296                         dir->i_ino, PFID(ll_inode2fid(dir)));
 297
 298         rc = ll_get_default_mdsize(sbi, &lmmsize);
 299         if (rc != 0)
 300                 return ERR_PTR(rc);
 301
 302         op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
 303                                      strlen(dotdot), lmmsize,
 304                                      LUSTRE_OPC_ANY, NULL);
 305         if (IS_ERR(op_data))
 306                 return (void *)op_data;
 307
 308         rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
 309         ll_finish_md_op_data(op_data);
 310         if (rc) {
 311                 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
 312                 return ERR_PTR(rc);
 313         }
 314         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 315         LASSERT(body->valid & OBD_MD_FLID);
 316
 317         CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
 318                 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
 319
 320         result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
 321
 322         ptlrpc_req_finished(req);
 323         return result;
 324 }
 325
 326 struct export_operations lustre_export_operations = {
 327        .get_parent = ll_get_parent,
 328        .encode_fh  = ll_encode_fh,
 329        .get_name   = ll_get_name,
 330         .fh_to_dentry = ll_fh_to_dentry,
 331         .fh_to_parent = ll_fh_to_parent,
 332 };