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 2008 Sun Microsystems, Inc. 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"
61 static int mgs_export_stats_init(struct obd_device *obd, struct obd_export *exp,
64 lnet_nid_t *client_nid = localdata;
68 rc = lprocfs_exp_setup(exp, client_nid, &newnid);
70 /* Mask error for already created
78 rc = lprocfs_nid_ldlm_stats_init(exp->exp_nid_stats);
84 lprocfs_exp_cleanup(exp);
89 * Add client export data to the MGS. This data is currently NOT stored on
90 * disk in the last_rcvd file or anywhere else. In the event of a MGS
91 * crash all connections are treated as new connections.
93 int mgs_client_add(struct obd_device *obd, struct obd_export *exp,
96 return mgs_export_stats_init(obd, exp, localdata);
99 /* Remove client export data from the MGS */
100 int mgs_client_free(struct obd_export *exp)
105 /* Same as mds_fid2dentry */
106 /* Look up an entry by inode number. */
107 /* this function ONLY returns valid dget'd dentries with an initialized inode
109 static struct dentry *mgs_fid2dentry(struct mgs_obd *mgs,
110 __u64 ino, __u32 gen)
114 struct dentry *result;
117 CDEBUG(D_DENTRY, "--> mgs_fid2dentry: ino/gen %lu/%u, sb %p\n",
118 (unsigned long)ino, gen, mgs->mgs_sb);
121 RETURN(ERR_PTR(-ESTALE));
123 snprintf(fid_name, sizeof(fid_name), "0x%lx", (unsigned long)ino);
125 /* under ext3 this is neither supposed to return bad inodes nor NULL
127 result = ll_lookup_one_len(fid_name, mgs->mgs_fid_de, strlen(fid_name));
131 inode = result->d_inode;
133 RETURN(ERR_PTR(-ENOENT));
135 if (inode->i_generation == 0 || inode->i_nlink == 0) {
136 LCONSOLE_WARN("Found inode with zero generation or link -- this"
137 " may indicate disk corruption (inode: %lu, link:"
138 " %lu, count: %d)\n", inode->i_ino,
139 (unsigned long)inode->i_nlink,
140 atomic_read(&inode->i_count));
142 RETURN(ERR_PTR(-ENOENT));
145 if (gen && inode->i_generation != gen) {
146 /* we didn't find the right inode.. */
147 CDEBUG(D_INODE, "found wrong generation: inode %lu, link: %lu, "
148 "count: %d, generation %u/%u\n", inode->i_ino,
149 (unsigned long)inode->i_nlink,
150 atomic_read(&inode->i_count),
151 inode->i_generation, gen);
153 RETURN(ERR_PTR(-ENOENT));
159 static struct dentry *mgs_lvfs_fid2dentry(__u64 id, __u32 gen,
160 __u64 gr, void *data)
162 struct obd_device *obd = data;
163 return mgs_fid2dentry(&obd->u.mgs, id, gen);
166 struct lvfs_callback_ops mgs_lvfs_ops = {
167 l_fid2dentry: mgs_lvfs_fid2dentry,
170 int mgs_fs_setup(struct obd_device *obd, struct vfsmount *mnt)
172 struct mgs_obd *mgs = &obd->u.mgs;
173 struct lvfs_run_ctxt saved;
174 struct dentry *dentry;
178 /* FIXME what's this? Do I need it? */
179 rc = cfs_cleanup_group_info();
183 mgs->mgs_vfsmnt = mnt;
184 mgs->mgs_sb = mnt->mnt_root->d_inode->i_sb;
186 fsfilt_setup(obd, mgs->mgs_sb);
188 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
189 obd->obd_lvfs_ctxt.pwdmnt = mnt;
190 obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
191 obd->obd_lvfs_ctxt.fs = get_ds();
192 obd->obd_lvfs_ctxt.cb_ops = mgs_lvfs_ops;
194 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
196 /* Setup the configs dir */
197 dentry = simple_mkdir(current->fs->pwd, mnt, MOUNT_CONFIGS_DIR, 0777, 1);
198 if (IS_ERR(dentry)) {
199 rc = PTR_ERR(dentry);
200 CERROR("cannot create %s directory: rc = %d\n",
201 MOUNT_CONFIGS_DIR, rc);
204 mgs->mgs_configs_dir = dentry;
206 /* Need the iopen dir for fid2dentry, required by
207 LLOG_ORIGIN_HANDLE_READ_HEADER */
208 dentry = lookup_one_len("__iopen__", current->fs->pwd,
209 strlen("__iopen__"));
210 if (IS_ERR(dentry)) {
211 rc = PTR_ERR(dentry);
212 CERROR("cannot lookup __iopen__ directory: rc = %d\n", rc);
213 GOTO(err_configs, rc);
215 mgs->mgs_fid_de = dentry;
216 if (!dentry->d_inode || is_bad_inode(dentry->d_inode)) {
218 CERROR("__iopen__ directory has no inode? rc = %d\n", rc);
223 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
226 dput(mgs->mgs_fid_de);
228 dput(mgs->mgs_configs_dir);
232 int mgs_fs_cleanup(struct obd_device *obd)
234 struct mgs_obd *mgs = &obd->u.mgs;
235 struct lvfs_run_ctxt saved;
238 class_disconnect_exports(obd); /* cleans up client info too */
240 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
242 if (mgs->mgs_configs_dir) {
243 l_dput(mgs->mgs_configs_dir);
244 mgs->mgs_configs_dir = NULL;
247 dput(mgs->mgs_fid_de);
248 shrink_dcache_sb(mgs->mgs_sb);
250 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);