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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2011, Whamcloud, Inc.
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>
43 #define DEBUG_SUBSYSTEM S_MGS
45 #include <linux/module.h>
46 #include <linux/kmod.h>
47 #include <linux/version.h>
48 #include <linux/sched.h>
49 #include <linux/mount.h>
50 #include <obd_class.h>
51 #include <obd_support.h>
52 #include <lustre_disk.h>
53 #include <lustre_lib.h>
54 #include <lustre_fsfilt.h>
55 #include <libcfs/list.h>
56 #include "mgs_internal.h"
58 int mgs_export_stats_init(struct obd_device *obd, struct obd_export *exp,
62 lnet_nid_t *client_nid = localdata;
66 rc = lprocfs_exp_setup(exp, client_nid, &newnid);
68 /* Mask error for already created
75 struct nid_stat *tmp = exp->exp_nid_stats;
78 num_stats = (sizeof(*obd->obd_type->typ_dt_ops) / sizeof(void *)) +
80 tmp->nid_stats = lprocfs_alloc_stats(num_stats,
81 LPROCFS_STATS_FLAG_NOPERCPU);
82 if (tmp->nid_stats == NULL)
84 lprocfs_init_ops_stats(LPROC_MGS_LAST, tmp->nid_stats);
85 mgs_stats_counter_init(tmp->nid_stats);
86 rc = lprocfs_register_stats(tmp->nid_proc, "stats",
91 rc = lprocfs_nid_ldlm_stats_init(tmp);
101 * Add client export data to the MGS. This data is currently NOT stored on
102 * disk in the last_rcvd file or anywhere else. In the event of a MGS
103 * crash all connections are treated as new connections.
105 int mgs_client_add(struct obd_device *obd, 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_lvfs_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_lvfs_fid2dentry(__u64 id, __u32 gen,
122 __u64 gr, void *data)
124 struct fsfilt_fid fid;
125 struct obd_device *obd = (struct obd_device *)data;
128 CDEBUG(D_DENTRY, "--> mgs_fid2dentry: ino/gen %lu/%u, sb %p\n",
129 (unsigned long)id, gen, obd->u.mgs.mgs_sb);
132 RETURN(ERR_PTR(-ESTALE));
137 RETURN(fsfilt_fid2dentry(obd, obd->u.mgs.mgs_vfsmnt, &fid, 0));
140 struct lvfs_callback_ops mgs_lvfs_ops = {
141 l_fid2dentry: mgs_lvfs_fid2dentry,
144 int mgs_fs_setup(struct obd_device *obd, struct vfsmount *mnt)
146 struct mgs_obd *mgs = &obd->u.mgs;
147 struct lvfs_run_ctxt saved;
148 struct dentry *dentry;
152 /* FIXME what's this? Do I need it? */
153 rc = cfs_cleanup_group_info();
157 mgs->mgs_vfsmnt = mnt;
158 mgs->mgs_sb = mnt->mnt_root->d_inode->i_sb;
160 rc = fsfilt_setup(obd, mgs->mgs_sb);
164 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
165 obd->obd_lvfs_ctxt.pwdmnt = mnt;
166 obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
167 obd->obd_lvfs_ctxt.fs = get_ds();
168 obd->obd_lvfs_ctxt.cb_ops = mgs_lvfs_ops;
170 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
172 /* Setup the configs dir */
173 dentry = simple_mkdir(cfs_fs_pwd(current->fs), mnt, MOUNT_CONFIGS_DIR, 0777, 1);
174 if (IS_ERR(dentry)) {
175 rc = PTR_ERR(dentry);
176 CERROR("cannot create %s directory: rc = %d\n",
177 MOUNT_CONFIGS_DIR, rc);
180 mgs->mgs_configs_dir = dentry;
182 /* create directory to store nid table versions */
183 dentry = simple_mkdir(cfs_fs_pwd(current->fs), mnt, MGS_NIDTBL_DIR,
185 if (IS_ERR(dentry)) {
186 rc = PTR_ERR(dentry);
187 CERROR("cannot create %s directory: rc = %d\n",
188 MOUNT_CONFIGS_DIR, rc);
195 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
199 int mgs_fs_cleanup(struct obd_device *obd)
201 struct mgs_obd *mgs = &obd->u.mgs;
202 struct lvfs_run_ctxt saved;
205 class_disconnect_exports(obd); /* cleans up client info too */
207 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
209 if (mgs->mgs_configs_dir) {
210 l_dput(mgs->mgs_configs_dir);
211 mgs->mgs_configs_dir = NULL;
214 shrink_dcache_sb(mgs->mgs_sb);
216 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);