1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * NFS export of Lustre Light File System
6 * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_LLITE
25 #include <linux/lustre_lite.h>
26 #include "llite_internal.h"
28 __u32 get_uuid2int(const char *name, int len)
30 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
32 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
33 if (key & 0x80000000) key -= 0x7fffffff;
40 static struct inode * search_inode_for_lustre(struct super_block *sb,
42 unsigned long generation,
45 struct ptlrpc_request *req = NULL;
46 struct ll_sb_info *sbi = ll_s2sbi(sb);
48 unsigned long valid = 0;
49 int eadatalen = 0, rc;
50 struct inode *inode = NULL;
52 inode = ILOOKUP(sb, ino, NULL, NULL);
57 eadatalen = obd_size_diskmd(sbi->ll_osc_exp, NULL);
58 valid |= OBD_MD_FLEASIZE;
61 fid.generation = generation;
64 rc = mdc_getattr(sbi->ll_mdc_exp, &fid, valid, eadatalen, &req);
66 CERROR("failure %d inode %lu\n", rc, ino);
70 rc = ll_prep_inode(sbi->ll_osc_exp, &inode, req, 0, sb);
72 ptlrpc_req_finished(req);
75 ptlrpc_req_finished(req);
80 extern struct dentry_operations ll_d_ops;
82 static struct dentry *ll_iget_for_nfs(struct super_block *sb, unsigned long ino,
83 __u32 generation, umode_t mode)
86 struct dentry *result;
90 return ERR_PTR(-ESTALE);
92 inode = search_inode_for_lustre(sb, ino, generation, mode);
94 return ERR_PTR(PTR_ERR(inode));
96 if (is_bad_inode(inode)
97 || (generation && inode->i_generation != generation)
99 /* we didn't find the right inode.. */
100 CERROR(" Inode %lu, Bad count: %lu %d or version %u %u\n",
102 (unsigned long)inode->i_nlink,
103 atomic_read(&inode->i_count),
107 return ERR_PTR(-ESTALE);
110 /* now to find a dentry.
111 * If possible, get a well-connected one
113 spin_lock(&dcache_lock);
114 for (lp = inode->i_dentry.next; lp != &inode->i_dentry ; lp=lp->next) {
115 result = list_entry(lp,struct dentry, d_alias);
116 if (!(result->d_flags & DCACHE_DISCONNECTED)) {
118 result->d_vfs_flags |= DCACHE_REFERENCED;
119 spin_unlock(&dcache_lock);
124 spin_unlock(&dcache_lock);
125 result = d_alloc_root(inode);
126 if (result == NULL) {
128 return ERR_PTR(-ENOMEM);
130 result->d_flags |= DCACHE_DISCONNECTED;
133 result->d_op = &ll_d_ops;
137 struct dentry *ll_fh_to_dentry(struct super_block *sb, __u32 *data, int len,
138 int fhtype, int parent)
145 return ll_iget_for_nfs(sb, data[3], 0, data[4]);
151 return ll_iget_for_nfs(sb, data[0], data[1], data[2]);
154 return ERR_PTR(-EINVAL);
157 int ll_dentry_to_fh(struct dentry *dentry, __u32 *datap, int *lenp,
162 *datap++ = dentry->d_inode->i_ino;
163 *datap++ = dentry->d_inode->i_generation;
164 *datap++ = (__u32)(S_IFMT & dentry->d_inode->i_mode);
166 if (*lenp == 3 || S_ISDIR(dentry->d_inode->i_mode)) {
170 if (dentry->d_parent) {
171 *datap++ = dentry->d_parent->d_inode->i_ino;
172 *datap++ = (__u32)(S_IFMT & dentry->d_parent->d_inode->i_mode);