1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
5 * Lustre Management Server (MGS) filesystem interface code
7 * Copyright (C) 2006 Cluster File Systems, Inc.
8 * Author: Nathan Rutman <nathan@clusterfs.com>
10 * This file is part of Lustre, http://www.lustre.org.
12 * Lustre is free software; you can redistribute it and/or
13 * modify it under the terms of version 2 of the GNU General Public
14 * License as published by the Free Software Foundation.
16 * Lustre is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 # define EXPORT_SYMTAB
28 #define DEBUG_SUBSYSTEM S_MGS
30 #include <linux/module.h>
31 #include <linux/kmod.h>
32 #include <linux/version.h>
33 #include <linux/sched.h>
34 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
35 #include <linux/mount.h>
37 #include <obd_class.h>
38 #include <obd_support.h>
39 #include <lustre_disk.h>
40 #include <lustre_lib.h>
41 #include <lustre_fsfilt.h>
42 #include <libcfs/list.h>
43 #include "mgs_internal.h"
45 /* Same as mds_fid2dentry */
46 /* Look up an entry by inode number. */
47 /* this function ONLY returns valid dget'd dentries with an initialized inode
49 static struct dentry *mgs_fid2dentry(struct mgs_obd *mgs,
54 struct dentry *result;
57 CDEBUG(D_DENTRY, "--> mgs_fid2dentry: ino/gen %lu/%u, sb %p\n",
58 (unsigned long)ino, gen, mgs->mgs_sb);
61 RETURN(ERR_PTR(-ESTALE));
63 snprintf(fid_name, sizeof(fid_name), "0x%lx", (unsigned long)ino);
65 /* under ext3 this is neither supposed to return bad inodes nor NULL
67 result = ll_lookup_one_len(fid_name, mgs->mgs_fid_de, strlen(fid_name));
71 inode = result->d_inode;
73 RETURN(ERR_PTR(-ENOENT));
75 if (inode->i_generation == 0 || inode->i_nlink == 0) {
76 LCONSOLE_WARN("Found inode with zero generation or link -- this"
77 " may indicate disk corruption (inode: %lu, link:"
78 " %lu, count: %d)\n", inode->i_ino,
79 (unsigned long)inode->i_nlink,
80 atomic_read(&inode->i_count));
82 RETURN(ERR_PTR(-ENOENT));
85 if (gen && inode->i_generation != gen) {
86 /* we didn't find the right inode.. */
87 CDEBUG(D_INODE, "found wrong generation: inode %lu, link: %lu, "
88 "count: %d, generation %u/%u\n", inode->i_ino,
89 (unsigned long)inode->i_nlink, atomic_read(&inode->i_count),
90 inode->i_generation, gen);
92 RETURN(ERR_PTR(-ENOENT));
98 static struct dentry *mgs_lvfs_fid2dentry(__u64 id, __u32 gen,
101 struct obd_device *obd = data;
102 return mgs_fid2dentry(&obd->u.mgs, id, gen);
105 struct lvfs_callback_ops mgs_lvfs_ops = {
106 l_fid2dentry: mgs_lvfs_fid2dentry,
109 int mgs_fs_setup(struct obd_device *obd, struct vfsmount *mnt)
111 struct mgs_obd *mgs = &obd->u.mgs;
112 struct lvfs_run_ctxt saved;
113 struct dentry *dentry;
117 /* FIXME what's this? Do I need it? */
118 rc = cleanup_group_info();
122 mgs->mgs_vfsmnt = mnt;
123 mgs->mgs_sb = mnt->mnt_root->d_inode->i_sb;
125 fsfilt_setup(obd, mgs->mgs_sb);
127 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
128 obd->obd_lvfs_ctxt.pwdmnt = mnt;
129 obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
130 obd->obd_lvfs_ctxt.fs = get_ds();
131 obd->obd_lvfs_ctxt.cb_ops = mgs_lvfs_ops;
133 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
135 /* Setup the configs dir */
136 dentry = simple_mkdir(current->fs->pwd, MOUNT_CONFIGS_DIR, 0777, 1);
137 if (IS_ERR(dentry)) {
138 rc = PTR_ERR(dentry);
139 CERROR("cannot create %s directory: rc = %d\n",
140 MOUNT_CONFIGS_DIR, rc);
143 mgs->mgs_configs_dir = dentry;
145 /* Need the iopen dir for fid2dentry, required by
146 LLOG_ORIGIN_HANDLE_READ_HEADER */
147 dentry = lookup_one_len("__iopen__", current->fs->pwd,
148 strlen("__iopen__"));
149 if (IS_ERR(dentry)) {
150 rc = PTR_ERR(dentry);
151 CERROR("cannot lookup __iopen__ directory: rc = %d\n", rc);
152 GOTO(err_configs, rc);
154 mgs->mgs_fid_de = dentry;
155 if (!dentry->d_inode || is_bad_inode(dentry->d_inode)) {
157 CERROR("__iopen__ directory has no inode? rc = %d\n", rc);
162 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
165 dput(mgs->mgs_fid_de);
167 dput(mgs->mgs_configs_dir);
171 int mgs_fs_cleanup(struct obd_device *obd)
173 struct mgs_obd *mgs = &obd->u.mgs;
174 struct lvfs_run_ctxt saved;
177 class_disconnect_exports(obd); /* cleans up client info too */
179 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
181 if (mgs->mgs_configs_dir) {
182 /*CERROR("configs dir dcount=%d\n",
183 atomic_read(&mgs->mgs_configs_dir->d_count));*/
184 l_dput(mgs->mgs_configs_dir);
185 mgs->mgs_configs_dir = NULL;
188 shrink_dcache_parent(mgs->mgs_fid_de);
189 /*CERROR("fid dir dcount=%d\n",
190 atomic_read(&mgs->mgs_fid_de->d_count));*/
191 dput(mgs->mgs_fid_de);
193 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);