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 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
  62 {
  63         return lu_fid_eq(&ll_i2info(inode)->lli_fid,
  64                          (struct lu_fid *)opaque);
  65 }
  66
  67 struct inode *search_inode_for_lustre(struct super_block *sb,
  68                                       const struct lu_fid *fid)
  69 {
  70         struct ll_sb_info     *sbi = ll_s2sbi(sb);
  71         struct ptlrpc_request *req = NULL;
  72         struct inode      *inode = NULL;
  73         int                eadatalen = 0;
  74         unsigned long         hash = cl_fid_build_ino(fid,
  75                                                       ll_need_32bit_api(sbi));
  76         struct  md_op_data    *op_data;
  77         int                rc;
  78         ENTRY;
  79
  80         CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
  81
  82         inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
  83         if (inode)
  84                 RETURN(inode);
  85
  86         rc = ll_get_max_mdsize(sbi, &eadatalen);
  87         if (rc)
  88                 RETURN(ERR_PTR(rc));
  89
  90         /* Because inode is NULL, ll_prep_md_op_data can not
  91          * be used here. So we allocate op_data ourselves */
  92         OBD_ALLOC_PTR(op_data);
  93         if (op_data == NULL)
  94                 return ERR_PTR(-ENOMEM);
  95
  96         op_data->op_fid1 = *fid;
  97         op_data->op_mode = eadatalen;
  98         op_data->op_valid = OBD_MD_FLEASIZE;
  99
 100         /* mds_fid2dentry ignores f_type */
 101         rc = md_getattr(sbi->ll_md_exp, op_data, &req);
 102         OBD_FREE_PTR(op_data);
 103         if (rc) {
 104                 CERROR("can't get object attrs, fid "DFID", rc %d\n",
 105                        PFID(fid), rc);
 106                 RETURN(ERR_PTR(rc));
 107         }
 108         rc = ll_prep_inode(&inode, req, sb, NULL);
 109         ptlrpc_req_finished(req);
 110         if (rc)
 111                 RETURN(ERR_PTR(rc));
 112
 113         RETURN(inode);
 114 }
 115
 116 struct lustre_nfs_fid {
 117         struct lu_fid   lnf_child;
 118         struct lu_fid   lnf_parent;
 119 };
 120
 121 static struct dentry *
 122 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
 123 {
 124         struct inode  *inode;
 125         struct dentry *result;
 126         ENTRY;
 127
 128         CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
 129         if (!fid_is_sane(fid))
 130                 RETURN(ERR_PTR(-ESTALE));
 131
 132         inode = search_inode_for_lustre(sb, fid);
 133         if (IS_ERR(inode))
 134                 RETURN(ERR_PTR(PTR_ERR(inode)));
 135
 136         if (is_bad_inode(inode)) {
 137                 /* we didn't find the right inode.. */
 138                 iput(inode);
 139                 RETURN(ERR_PTR(-ESTALE));
 140         }
 141
 142         /**
 143          * It is an anonymous dentry without OST objects created yet.
 144          * We have to find the parent to tell MDS how to init lov objects.
 145          */
 146         if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
 147             parent != NULL) {
 148                 struct ll_inode_info *lli = ll_i2info(inode);
 149
 150                 spin_lock(&lli->lli_lock);
 151                 lli->lli_pfid = *parent;
 152                 spin_unlock(&lli->lli_lock);
 153         }
 154
 155         result = d_obtain_alias(inode);
 156         if (IS_ERR(result))
 157                 RETURN(result);
 158
 159         ll_dops_init(result, 1, 0);
 160
 161         RETURN(result);
 162 }
 163
 164 #define LUSTRE_NFS_FID    0x97
 165
 166 /**
 167  * \a connectable - is nfsd will connect himself or this should be done
 168  *                at lustre
 169  *
 170  * The return value is file handle type:
 171  * 1 -- contains child file handle;
 172  * 2 -- contains child file handle and parent file handle;
 173  * 255 -- error.
 174  */
 175 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
 176                         struct inode *parent)
 177 {
 178         struct lustre_nfs_fid *nfs_fid = (void *)fh;
 179         ENTRY;
 180
 181         CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
 182               inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
 183               (int)sizeof(struct lustre_nfs_fid));
 184
 185         if (*plen < sizeof(struct lustre_nfs_fid) / 4)
 186                 RETURN(255);
 187
 188         nfs_fid->lnf_child = *ll_inode2fid(inode);
 189         nfs_fid->lnf_parent = *ll_inode2fid(parent);
 190         *plen = sizeof(struct lustre_nfs_fid) / 4;
 191
 192         RETURN(LUSTRE_NFS_FID);
 193 }
 194
 195 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
 196                                    loff_t hash, u64 ino, unsigned type)
 197 {
 198         /* It is hack to access lde_fid for comparison with lgd_fid.
 199          * So the input 'name' must be part of the 'lu_dirent'. */
 200         struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
 201         struct ll_getname_data *lgd = cookie;
 202         struct lu_fid fid;
 203
 204         fid_le_to_cpu(&fid, &lde->lde_fid);
 205         if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
 206                 memcpy(lgd->lgd_name, name, namelen);
 207                 lgd->lgd_name[namelen] = 0;
 208                 lgd->lgd_found = 1;
 209         }
 210         return lgd->lgd_found;
 211 }
 212
 213 static int ll_get_name(struct dentry *dentry, char *name,
 214                        struct dentry *child)
 215 {
 216         struct inode *dir = dentry->d_inode;
 217         struct ll_getname_data lgd;
 218         __u64 offset = 0;
 219         int rc;
 220         ENTRY;
 221
 222         if (!dir || !S_ISDIR(dir->i_mode))
 223                 GOTO(out, rc = -ENOTDIR);
 224
 225         if (!dir->i_fop)
 226                 GOTO(out, rc = -EINVAL);
 227
 228         lgd.lgd_name = name;
 229         lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid;
 230         lgd.lgd_found = 0;
 231
 232         mutex_lock(&dir->i_mutex);
 233         rc = ll_dir_read(dir, &offset, &lgd, ll_nfs_get_name_filldir);
 234         mutex_unlock(&dir->i_mutex);
 235         if (!rc && !lgd.lgd_found)
 236                 rc = -ENOENT;
 237         EXIT;
 238
 239 out:
 240         return rc;
 241 }
 242
 243 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
 244                                       int fh_len, int fh_type)
 245 {
 246         struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
 247
 248         if (fh_type != LUSTRE_NFS_FID)
 249                 RETURN(ERR_PTR(-EPROTO));
 250
 251         RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
 252 }
 253
 254 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
 255                                       int fh_len, int fh_type)
 256 {
 257         struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
 258
 259         if (fh_type != LUSTRE_NFS_FID)
 260                 RETURN(ERR_PTR(-EPROTO));
 261
 262         RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
 263 }
 264
 265 static struct dentry *ll_get_parent(struct dentry *dchild)
 266 {
 267         struct ptlrpc_request *req = NULL;
 268         struct inode      *dir = dchild->d_inode;
 269         struct ll_sb_info     *sbi;
 270         struct dentry    *result = NULL;
 271         struct mdt_body       *body;
 272         static char        dotdot[] = "..";
 273         struct md_op_data     *op_data;
 274         int                rc;
 275         int                   lmmsize;
 276         ENTRY;
 277
 278         LASSERT(dir && S_ISDIR(dir->i_mode));
 279
 280         sbi = ll_s2sbi(dir->i_sb);
 281
 282         CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
 283                         dir->i_ino, PFID(ll_inode2fid(dir)));
 284
 285         rc = ll_get_max_mdsize(sbi, &lmmsize);
 286         if (rc != 0)
 287                 RETURN(ERR_PTR(rc));
 288
 289         op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
 290                                      strlen(dotdot), lmmsize,
 291                                      LUSTRE_OPC_ANY, NULL);
 292         if (IS_ERR(op_data))
 293                 RETURN((void *)op_data);
 294
 295         rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
 296         ll_finish_md_op_data(op_data);
 297         if (rc) {
 298                 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
 299                 RETURN(ERR_PTR(rc));
 300         }
 301         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 302         LASSERT(body->valid & OBD_MD_FLID);
 303
 304         CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
 305                 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
 306
 307         result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
 308
 309         ptlrpc_req_finished(req);
 310         RETURN(result);
 311 }
 312
 313 struct export_operations lustre_export_operations = {
 314        .get_parent = ll_get_parent,
 315        .encode_fh  = ll_encode_fh,
 316        .get_name   = ll_get_name,
 317         .fh_to_dentry = ll_fh_to_dentry,
 318         .fh_to_parent = ll_fh_to_parent,
 319 };