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
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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 /* Same as mds_fid2dentry */
62 /* Look up an entry by inode number. */
63 /* this function ONLY returns valid dget'd dentries with an initialized inode
65 static struct dentry *mgs_fid2dentry(struct mgs_obd *mgs,
70 struct dentry *result;
73 CDEBUG(D_DENTRY, "--> mgs_fid2dentry: ino/gen %lu/%u, sb %p\n",
74 (unsigned long)ino, gen, mgs->mgs_sb);
77 RETURN(ERR_PTR(-ESTALE));
79 snprintf(fid_name, sizeof(fid_name), "0x%lx", (unsigned long)ino);
81 /* under ext3 this is neither supposed to return bad inodes nor NULL
83 result = ll_lookup_one_len(fid_name, mgs->mgs_fid_de, strlen(fid_name));
87 inode = result->d_inode;
89 RETURN(ERR_PTR(-ENOENT));
91 if (inode->i_generation == 0 || inode->i_nlink == 0) {
92 LCONSOLE_WARN("Found inode with zero generation or link -- this"
93 " may indicate disk corruption (inode: %lu, link:"
94 " %lu, count: %d)\n", inode->i_ino,
95 (unsigned long)inode->i_nlink,
96 atomic_read(&inode->i_count));
98 RETURN(ERR_PTR(-ENOENT));
101 if (gen && inode->i_generation != gen) {
102 /* we didn't find the right inode.. */
103 CDEBUG(D_INODE, "found wrong generation: inode %lu, link: %lu, "
104 "count: %d, generation %u/%u\n", inode->i_ino,
105 (unsigned long)inode->i_nlink, atomic_read(&inode->i_count),
106 inode->i_generation, gen);
108 RETURN(ERR_PTR(-ENOENT));
114 static struct dentry *mgs_lvfs_fid2dentry(__u64 id, __u32 gen,
115 __u64 gr, void *data)
117 struct obd_device *obd = data;
118 return mgs_fid2dentry(&obd->u.mgs, id, gen);
121 struct lvfs_callback_ops mgs_lvfs_ops = {
122 l_fid2dentry: mgs_lvfs_fid2dentry,
125 int mgs_fs_setup(struct obd_device *obd, struct vfsmount *mnt)
127 struct mgs_obd *mgs = &obd->u.mgs;
128 struct lvfs_run_ctxt saved;
129 struct dentry *dentry;
133 /* FIXME what's this? Do I need it? */
134 rc = cleanup_group_info();
138 mgs->mgs_vfsmnt = mnt;
139 mgs->mgs_sb = mnt->mnt_root->d_inode->i_sb;
141 fsfilt_setup(obd, mgs->mgs_sb);
143 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
144 obd->obd_lvfs_ctxt.pwdmnt = mnt;
145 obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
146 obd->obd_lvfs_ctxt.fs = get_ds();
147 obd->obd_lvfs_ctxt.cb_ops = mgs_lvfs_ops;
149 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
151 /* Setup the configs dir */
152 dentry = simple_mkdir(current->fs->pwd, mnt, MOUNT_CONFIGS_DIR, 0777, 1);
153 if (IS_ERR(dentry)) {
154 rc = PTR_ERR(dentry);
155 CERROR("cannot create %s directory: rc = %d\n",
156 MOUNT_CONFIGS_DIR, rc);
159 mgs->mgs_configs_dir = dentry;
161 /* Need the iopen dir for fid2dentry, required by
162 LLOG_ORIGIN_HANDLE_READ_HEADER */
163 dentry = lookup_one_len("__iopen__", current->fs->pwd,
164 strlen("__iopen__"));
165 if (IS_ERR(dentry)) {
166 rc = PTR_ERR(dentry);
167 CERROR("cannot lookup __iopen__ directory: rc = %d\n", rc);
168 GOTO(err_configs, rc);
170 mgs->mgs_fid_de = dentry;
171 if (!dentry->d_inode || is_bad_inode(dentry->d_inode)) {
173 CERROR("__iopen__ directory has no inode? rc = %d\n", rc);
178 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
181 dput(mgs->mgs_fid_de);
183 dput(mgs->mgs_configs_dir);
187 int mgs_fs_cleanup(struct obd_device *obd)
189 struct mgs_obd *mgs = &obd->u.mgs;
190 struct lvfs_run_ctxt saved;
193 class_disconnect_exports(obd); /* cleans up client info too */
195 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
197 if (mgs->mgs_configs_dir) {
198 /*CERROR("configs dir dcount=%d\n",
199 atomic_read(&mgs->mgs_configs_dir->d_count));*/
200 l_dput(mgs->mgs_configs_dir);
201 mgs->mgs_configs_dir = NULL;
204 shrink_dcache_parent(mgs->mgs_fid_de);
205 /*CERROR("fid dir dcount=%d\n",
206 atomic_read(&mgs->mgs_fid_de->d_count));*/
207 dput(mgs->mgs_fid_de);
209 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);