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         ENTRY;
  95
  96         CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
  97
  98         inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
  99         if (inode)
 100                 RETURN(inode);
 101
 102         rc = ll_get_max_mdsize(sbi, &eadatalen);
 103         if (rc)
 104                 RETURN(ERR_PTR(rc));
 105
 106         /* Because inode is NULL, ll_prep_md_op_data can not
 107          * be used here. So we allocate op_data ourselves */
 108         OBD_ALLOC_PTR(op_data);
 109         if (op_data == NULL)
 110                 return ERR_PTR(-ENOMEM);
 111
 112         op_data->op_fid1 = *fid;
 113         op_data->op_mode = eadatalen;
 114         op_data->op_valid = OBD_MD_FLEASIZE;
 115
 116         /* mds_fid2dentry ignores f_type */
 117         rc = md_getattr(sbi->ll_md_exp, op_data, &req);
 118         OBD_FREE_PTR(op_data);
 119         if (rc) {
 120                 CERROR("can't get object attrs, fid "DFID", rc %d\n",
 121                        PFID(fid), rc);
 122                 RETURN(ERR_PTR(rc));
 123         }
 124         rc = ll_prep_inode(&inode, req, sb, NULL);
 125         ptlrpc_req_finished(req);
 126         if (rc)
 127                 RETURN(ERR_PTR(rc));
 128
 129         RETURN(inode);
 130 }
 131
 132 struct lustre_nfs_fid {
 133         struct lu_fid   lnf_child;
 134         struct lu_fid   lnf_parent;
 135 };
 136
 137 static struct dentry *
 138 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
 139 {
 140         struct inode  *inode;
 141         struct dentry *result;
 142         ENTRY;
 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_PTR(PTR_ERR(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         result = d_obtain_alias(inode);
 172         if (IS_ERR(result))
 173                 RETURN(result);
 174
 175         ll_dops_init(result, 1, 0);
 176
 177         RETURN(result);
 178 }
 179
 180 #define LUSTRE_NFS_FID    0x97
 181
 182 /**
 183  * \a connectable - is nfsd will connect himself or this should be done
 184  *                at lustre
 185  *
 186  * The return value is file handle type:
 187  * 1 -- contains child file handle;
 188  * 2 -- contains child file handle and parent file handle;
 189  * 255 -- error.
 190  */
 191 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
 192                         struct inode *parent)
 193 {
 194         struct lustre_nfs_fid *nfs_fid = (void *)fh;
 195         ENTRY;
 196
 197         CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
 198               inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
 199               (int)sizeof(struct lustre_nfs_fid));
 200
 201         if (*plen < sizeof(struct lustre_nfs_fid) / 4)
 202                 RETURN(255);
 203
 204         nfs_fid->lnf_child = *ll_inode2fid(inode);
 205         nfs_fid->lnf_parent = *ll_inode2fid(parent);
 206         *plen = sizeof(struct lustre_nfs_fid) / 4;
 207
 208         RETURN(LUSTRE_NFS_FID);
 209 }
 210
 211 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
 212                                    loff_t hash, u64 ino, unsigned type)
 213 {
 214         /* It is hack to access lde_fid for comparison with lgd_fid.
 215          * So the input 'name' must be part of the 'lu_dirent'. */
 216         struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
 217         struct ll_getname_data *lgd = cookie;
 218         struct lu_fid fid;
 219
 220         fid_le_to_cpu(&fid, &lde->lde_fid);
 221         if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
 222                 memcpy(lgd->lgd_name, name, namelen);
 223                 lgd->lgd_name[namelen] = 0;
 224                 lgd->lgd_found = 1;
 225         }
 226         return lgd->lgd_found;
 227 }
 228
 229 static int ll_get_name(struct dentry *dentry, char *name,
 230                        struct dentry *child)
 231 {
 232         struct inode *dir = dentry->d_inode;
 233         int rc;
 234         struct ll_getname_data lgd = {
 235                 .lgd_name = name,
 236                 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
 237                 .ctx.actor = ll_nfs_get_name_filldir,
 238         };
 239         ENTRY;
 240
 241         if (!dir || !S_ISDIR(dir->i_mode))
 242                 GOTO(out, rc = -ENOTDIR);
 243
 244         if (!dir->i_fop)
 245                 GOTO(out, rc = -EINVAL);
 246
 247         mutex_lock(&dir->i_mutex);
 248         rc = ll_dir_read(dir, &lgd.ctx);
 249         mutex_unlock(&dir->i_mutex);
 250         if (!rc && !lgd.lgd_found)
 251                 rc = -ENOENT;
 252         EXIT;
 253
 254 out:
 255         return rc;
 256 }
 257
 258 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
 259                                       int fh_len, int fh_type)
 260 {
 261         struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
 262
 263         if (fh_type != LUSTRE_NFS_FID)
 264                 RETURN(ERR_PTR(-EPROTO));
 265
 266         RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
 267 }
 268
 269 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
 270                                       int fh_len, int fh_type)
 271 {
 272         struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
 273
 274         if (fh_type != LUSTRE_NFS_FID)
 275                 RETURN(ERR_PTR(-EPROTO));
 276
 277         RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
 278 }
 279
 280 static struct dentry *ll_get_parent(struct dentry *dchild)
 281 {
 282         struct ptlrpc_request *req = NULL;
 283         struct inode      *dir = dchild->d_inode;
 284         struct ll_sb_info     *sbi;
 285         struct dentry    *result = NULL;
 286         struct mdt_body       *body;
 287         static char        dotdot[] = "..";
 288         struct md_op_data     *op_data;
 289         int                rc;
 290         int                   lmmsize;
 291         ENTRY;
 292
 293         LASSERT(dir && S_ISDIR(dir->i_mode));
 294
 295         sbi = ll_s2sbi(dir->i_sb);
 296
 297         CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
 298                         dir->i_ino, PFID(ll_inode2fid(dir)));
 299
 300         rc = ll_get_max_mdsize(sbi, &lmmsize);
 301         if (rc != 0)
 302                 RETURN(ERR_PTR(rc));
 303
 304         op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
 305                                      strlen(dotdot), lmmsize,
 306                                      LUSTRE_OPC_ANY, NULL);
 307         if (IS_ERR(op_data))
 308                 RETURN((void *)op_data);
 309
 310         rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
 311         ll_finish_md_op_data(op_data);
 312         if (rc) {
 313                 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
 314                 RETURN(ERR_PTR(rc));
 315         }
 316         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 317         LASSERT(body->valid & OBD_MD_FLID);
 318
 319         CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
 320                 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
 321
 322         result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
 323
 324         ptlrpc_req_finished(req);
 325         RETURN(result);
 326 }
 327
 328 struct export_operations lustre_export_operations = {
 329        .get_parent = ll_get_parent,
 330        .encode_fh  = ll_encode_fh,
 331        .get_name   = ll_get_name,
 332         .fh_to_dentry = ll_fh_to_dentry,
 333         .fh_to_parent = ll_fh_to_parent,
 334 };