1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
38 * Lustre Management Server (MGS) filesystem interface code
40 * Author: Nathan Rutman <nathan@clusterfs.com>
44 # define EXPORT_SYMTAB
46 #define DEBUG_SUBSYSTEM S_MGS
48 #include <linux/module.h>
49 #include <linux/kmod.h>
50 #include <linux/version.h>
51 #include <linux/sched.h>
52 #include <linux/mount.h>
53 #include <obd_class.h>
54 #include <obd_support.h>
55 #include <lustre_disk.h>
56 #include <lustre_lib.h>
57 #include <lustre_fsfilt.h>
58 #include <libcfs/list.h>
59 #include "mgs_internal.h"
62 int mgs_export_stats_init(struct obd_device *obd,
63 struct obd_export *exp,
67 lnet_nid_t *client_nid = localdata;
68 int rc, num_stats, newnid = 0;
70 rc = lprocfs_exp_setup(exp, client_nid, reconnect, &newnid);
72 /* Mask error for already created
80 struct nid_stat *tmp = exp->exp_nid_stats;
82 num_stats = (sizeof(*obd->obd_type->typ_ops) / sizeof(void *)) +
84 tmp->nid_stats = lprocfs_alloc_stats(num_stats,
85 LPROCFS_STATS_FLAG_NOPERCPU);
86 if (tmp->nid_stats == NULL)
89 lprocfs_init_ops_stats(LPROC_MGS_LAST, tmp->nid_stats);
90 mgs_stats_counter_init(tmp->nid_stats);
92 rc = lprocfs_nid_ldlm_stats_init(tmp);
100 /* Add client export data to the MGS. This data is currently NOT stored on
101 * disk in the last_rcvd file or anywhere else. In the event of a MGS
102 * crash all connections are treated as new connections.
104 int mgs_client_add(struct obd_device *obd,
105 struct obd_export *exp,
111 /* Remove client export data from the MGS */
112 int mgs_client_free(struct obd_export *exp)
117 /* Same as mds_fid2dentry */
118 /* Look up an entry by inode number. */
119 /* this function ONLY returns valid dget'd dentries with an initialized inode
121 static struct dentry *mgs_fid2dentry(struct mgs_obd *mgs, struct ll_fid *fid)
124 unsigned long ino = fid->id;
125 __u32 generation = fid->generation;
127 struct dentry *result;
129 CDEBUG(D_DENTRY, "--> mgs_fid2dentry: ino/gen %lu/%u, sb %p\n",
130 ino, generation, mgs->mgs_sb);
133 RETURN(ERR_PTR(-ESTALE));
135 snprintf(fid_name, sizeof(fid_name), "0x%lx", ino);
137 /* under ext3 this is neither supposed to return bad inodes
139 result = ll_lookup_one_len(fid_name, mgs->mgs_fid_de, strlen(fid_name));
143 inode = result->d_inode;
145 RETURN(ERR_PTR(-ENOENT));
147 if (inode->i_generation == 0 || inode->i_nlink == 0) {
148 LCONSOLE_WARN("Found inode with zero generation or link -- this"
149 " may indicate disk corruption (inode: %lu, link:"
150 " %lu, count: %d)\n", inode->i_ino,
151 (unsigned long)inode->i_nlink,
152 atomic_read(&inode->i_count));
154 RETURN(ERR_PTR(-ENOENT));
157 if (generation && inode->i_generation != generation) {
158 /* we didn't find the right inode.. */
159 CDEBUG(D_INODE, "found wrong generation: inode %lu, link: %lu, "
160 "count: %d, generation %u/%u\n", inode->i_ino,
161 (unsigned long)inode->i_nlink,
162 atomic_read(&inode->i_count), inode->i_generation,
165 RETURN(ERR_PTR(-ENOENT));
171 static struct dentry *mgs_lvfs_fid2dentry(__u64 id, __u32 gen, __u64 gr,
174 struct obd_device *obd = data;
177 fid.generation = gen;
178 return mgs_fid2dentry(&obd->u.mgs, &fid);
181 struct lvfs_callback_ops mgs_lvfs_ops = {
182 l_fid2dentry: mgs_lvfs_fid2dentry,
185 int mgs_fs_setup(struct obd_device *obd, struct vfsmount *mnt)
187 struct mgs_obd *mgs = &obd->u.mgs;
188 struct lvfs_run_ctxt saved;
189 struct dentry *dentry;
193 /* FIXME what's this? Do I need it? */
194 rc = cleanup_group_info();
198 mgs->mgs_vfsmnt = mnt;
199 mgs->mgs_sb = mnt->mnt_root->d_inode->i_sb;
201 rc = fsfilt_setup(obd, mgs->mgs_sb);
203 CWARN("fail to set fsfilter options\n");
205 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
206 obd->obd_lvfs_ctxt.pwdmnt = mnt;
207 obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
208 obd->obd_lvfs_ctxt.fs = get_ds();
209 obd->obd_lvfs_ctxt.cb_ops = mgs_lvfs_ops;
211 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
213 /* Setup the configs dir */
214 dentry = simple_mkdir(cfs_fs_pwd(current->fs), mnt, MOUNT_CONFIGS_DIR, 0777, 1);
215 if (IS_ERR(dentry)) {
216 rc = PTR_ERR(dentry);
217 CERROR("cannot create %s directory: rc = %d\n",
218 MOUNT_CONFIGS_DIR, rc);
221 mgs->mgs_configs_dir = dentry;
223 /* Need the iopen dir for fid2dentry, required by
224 LLOG_ORIGIN_HANDLE_READ_HEADER */
225 dentry = lookup_one_len("__iopen__", cfs_fs_pwd(current->fs),
226 strlen("__iopen__"));
227 if (IS_ERR(dentry)) {
228 rc = PTR_ERR(dentry);
229 CERROR("cannot lookup __iopen__ directory: rc = %d\n", rc);
230 GOTO(err_configs, rc);
232 mgs->mgs_fid_de = dentry;
233 if (!dentry->d_inode || is_bad_inode(dentry->d_inode)) {
235 CERROR("__iopen__ directory has no inode? rc = %d\n", rc);
240 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
243 dput(mgs->mgs_fid_de);
245 dput(mgs->mgs_configs_dir);
249 int mgs_fs_cleanup(struct obd_device *obd)
251 struct mgs_obd *mgs = &obd->u.mgs;
252 struct lvfs_run_ctxt saved;
255 class_disconnect_exports(obd); /* cleans up client info too */
257 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
259 if (mgs->mgs_configs_dir) {
260 l_dput(mgs->mgs_configs_dir);
261 mgs->mgs_configs_dir = NULL;
264 dput(mgs->mgs_fid_de);
265 shrink_dcache_sb(mgs->mgs_sb);
267 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);