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 <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         while (len--) {
  53                 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
  54                 if (key & 0x80000000) key -= 0x7fffffff;
  55                 key1 = key0;
  56                 key0 = key;
  57         }
  58         return (key0 << 1);
  59 }
  60
  61 void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
  62 {
  63         __u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
  64
  65         while (len--) {
  66                 key = key1 + (key0 ^ (*name++ * 7152373));
  67                 if (key & 0x8000000000000000ULL)
  68                         key -= 0x7fffffffffffffffULL;
  69                 key1 = key0;
  70                 key0 = key;
  71         }
  72
  73         fsid->val[0] = key;
  74         fsid->val[1] = key >> 32;
  75 }
  76
  77 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
  78 {
  79         return lu_fid_eq(&ll_i2info(inode)->lli_fid,
  80                          (struct lu_fid *)opaque);
  81 }
  82
  83 struct inode *search_inode_for_lustre(struct super_block *sb,
  84                                       const struct lu_fid *fid)
  85 {
  86         struct ll_sb_info     *sbi = ll_s2sbi(sb);
  87         struct ptlrpc_request *req = NULL;
  88         struct inode      *inode = NULL;
  89         int                eadatalen = 0;
  90         unsigned long         hash = cl_fid_build_ino(fid,
  91                                                       ll_need_32bit_api(sbi));
  92         struct  md_op_data    *op_data;
  93         int                rc;
  94
  95         CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
  96
  97         inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
  98         if (inode)
  99                 RETURN(inode);
 100
 101         rc = ll_get_max_mdsize(sbi, &eadatalen);
 102         if (rc)
 103                 RETURN(ERR_PTR(rc));
 104
 105         /* Because inode is NULL, ll_prep_md_op_data can not
 106          * be used here. So we allocate op_data ourselves */
 107         OBD_ALLOC_PTR(op_data);
 108         if (op_data == NULL)
 109                 return ERR_PTR(-ENOMEM);
 110
 111         op_data->op_fid1 = *fid;
 112         op_data->op_mode = eadatalen;
 113         op_data->op_valid = OBD_MD_FLEASIZE;
 114
 115         /* mds_fid2dentry ignores f_type */
 116         rc = md_getattr(sbi->ll_md_exp, op_data, &req);
 117         OBD_FREE_PTR(op_data);
 118         if (rc) {
 119                 CERROR("can't get object attrs, fid "DFID", rc %d\n",
 120                        PFID(fid), rc);
 121                 RETURN(ERR_PTR(rc));
 122         }
 123         rc = ll_prep_inode(&inode, req, sb, NULL);
 124         ptlrpc_req_finished(req);
 125         if (rc)
 126                 RETURN(ERR_PTR(rc));
 127
 128         RETURN(inode);
 129 }
 130
 131 struct lustre_nfs_fid {
 132         struct lu_fid   lnf_child;
 133         struct lu_fid   lnf_parent;
 134 };
 135
 136 static struct dentry *
 137 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
 138 {
 139         struct inode  *inode;
 140         struct dentry *result;
 141
 142         CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
 143         if (!fid_is_sane(fid))
 144                 RETURN(ERR_PTR(-ESTALE));
 145
 146         inode = search_inode_for_lustre(sb, fid);
 147         if (IS_ERR(inode))
 148                 RETURN(ERR_CAST(inode));
 149
 150         if (is_bad_inode(inode)) {
 151                 /* we didn't find the right inode.. */
 152                 iput(inode);
 153                 RETURN(ERR_PTR(-ESTALE));
 154         }
 155
 156         /**
 157          * It is an anonymous dentry without OST objects created yet.
 158          * We have to find the parent to tell MDS how to init lov objects.
 159          */
 160         if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
 161             parent != NULL) {
 162                 struct ll_inode_info *lli = ll_i2info(inode);
 163
 164                 spin_lock(&lli->lli_lock);
 165                 lli->lli_pfid = *parent;
 166                 spin_unlock(&lli->lli_lock);
 167         }
 168
 169         result = d_obtain_alias(inode);
 170         if (IS_ERR(result))
 171                 RETURN(result);
 172
 173         ll_dops_init(result, 1, 0);
 174
 175         RETURN(result);
 176 }
 177
 178 #define LUSTRE_NFS_FID    0x97
 179
 180 /**
 181  * \a connectable - is nfsd will connect himself or this should be done
 182  *                at lustre
 183  *
 184  * The return value is file handle type:
 185  * 1 -- contains child file handle;
 186  * 2 -- contains child file handle and parent file handle;
 187  * 255 -- error.
 188  */
 189 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
 190                         struct inode *parent)
 191 {
 192         struct lustre_nfs_fid *nfs_fid = (void *)fh;
 193
 194         CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
 195               inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
 196               (int)sizeof(struct lustre_nfs_fid));
 197
 198         if (*plen < sizeof(struct lustre_nfs_fid) / 4)
 199                 RETURN(255);
 200
 201         nfs_fid->lnf_child = *ll_inode2fid(inode);
 202         nfs_fid->lnf_parent = *ll_inode2fid(parent);
 203         *plen = sizeof(struct lustre_nfs_fid) / 4;
 204
 205         RETURN(LUSTRE_NFS_FID);
 206 }
 207
 208 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
 209                                    loff_t hash, u64 ino, 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 = cookie;
 215         struct lu_fid fid;
 216
 217         fid_le_to_cpu(&fid, &lde->lde_fid);
 218         if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
 219                 memcpy(lgd->lgd_name, name, namelen);
 220                 lgd->lgd_name[namelen] = 0;
 221                 lgd->lgd_found = 1;
 222         }
 223         return lgd->lgd_found;
 224 }
 225
 226 static int ll_get_name(struct dentry *dentry, char *name,
 227                        struct dentry *child)
 228 {
 229         struct inode *dir = dentry->d_inode;
 230         int rc;
 231         struct ll_getname_data lgd = {
 232                 .lgd_name = name,
 233                 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
 234                 .ctx.actor = ll_nfs_get_name_filldir,
 235         };
 236
 237         if (!dir || !S_ISDIR(dir->i_mode))
 238                 GOTO(out, rc = -ENOTDIR);
 239
 240         if (!dir->i_fop)
 241                 GOTO(out, rc = -EINVAL);
 242
 243         mutex_lock(&dir->i_mutex);
 244         rc = ll_dir_read(dir, &lgd.ctx);
 245         mutex_unlock(&dir->i_mutex);
 246         if (!rc && !lgd.lgd_found)
 247                 rc = -ENOENT;
 248 out:
 249         return rc;
 250 }
 251
 252 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
 253                                       int fh_len, int fh_type)
 254 {
 255         struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
 256
 257         if (fh_type != LUSTRE_NFS_FID)
 258                 RETURN(ERR_PTR(-EPROTO));
 259
 260         RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
 261 }
 262
 263 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
 264                                       int fh_len, int fh_type)
 265 {
 266         struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
 267
 268         if (fh_type != LUSTRE_NFS_FID)
 269                 RETURN(ERR_PTR(-EPROTO));
 270
 271         RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
 272 }
 273
 274 static struct dentry *ll_get_parent(struct dentry *dchild)
 275 {
 276         struct ptlrpc_request *req = NULL;
 277         struct inode      *dir = dchild->d_inode;
 278         struct ll_sb_info     *sbi;
 279         struct dentry    *result = NULL;
 280         struct mdt_body       *body;
 281         static char        dotdot[] = "..";
 282         struct md_op_data     *op_data;
 283         int                rc;
 284         int                   lmmsize;
 285
 286         LASSERT(dir && S_ISDIR(dir->i_mode));
 287
 288         sbi = ll_s2sbi(dir->i_sb);
 289
 290         CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
 291                         dir->i_ino, PFID(ll_inode2fid(dir)));
 292
 293         rc = ll_get_max_mdsize(sbi, &lmmsize);
 294         if (rc != 0)
 295                 RETURN(ERR_PTR(rc));
 296
 297         op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
 298                                      strlen(dotdot), lmmsize,
 299                                      LUSTRE_OPC_ANY, NULL);
 300         if (IS_ERR(op_data))
 301                 RETURN((void *)op_data);
 302
 303         rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
 304         ll_finish_md_op_data(op_data);
 305         if (rc) {
 306                 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
 307                 RETURN(ERR_PTR(rc));
 308         }
 309         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 310         LASSERT(body->valid & OBD_MD_FLID);
 311
 312         CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
 313                 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
 314
 315         result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
 316
 317         ptlrpc_req_finished(req);
 318         RETURN(result);
 319 }
 320
 321 struct export_operations lustre_export_operations = {
 322        .get_parent = ll_get_parent,
 323        .encode_fh  = ll_encode_fh,
 324        .get_name   = ll_get_name,
 325         .fh_to_dentry = ll_fh_to_dentry,
 326         .fh_to_parent = ll_fh_to_parent,
 327 };