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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, 2012, 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>
41 * Author: Alex Zhuravlev <bzzz@whamcloud.com>
44 #define DEBUG_SUBSYSTEM S_MGS
46 #include <linux/module.h>
47 #include <linux/kmod.h>
48 #include <linux/version.h>
49 #include <linux/sched.h>
50 #include <linux/mount.h>
51 #include <obd_class.h>
52 #include <obd_support.h>
53 #include <lustre_disk.h>
54 #include <lustre_lib.h>
55 #include <lustre_fsfilt.h>
56 #include <libcfs/list.h>
57 #include "mgs_internal.h"
59 int mgs_export_stats_init(struct obd_device *obd, struct obd_export *exp,
63 lnet_nid_t *client_nid = localdata;
67 rc = lprocfs_exp_setup(exp, client_nid, &newnid);
69 /* Mask error for already created
76 struct nid_stat *tmp = exp->exp_nid_stats;
79 num_stats = (sizeof(*obd->obd_type->typ_dt_ops) / sizeof(void *)) +
81 tmp->nid_stats = lprocfs_alloc_stats(num_stats,
82 LPROCFS_STATS_FLAG_NOPERCPU);
83 if (tmp->nid_stats == NULL)
85 lprocfs_init_ops_stats(LPROC_MGS_LAST, tmp->nid_stats);
86 mgs_stats_counter_init(tmp->nid_stats);
87 rc = lprocfs_register_stats(tmp->nid_proc, "stats",
92 rc = lprocfs_nid_ldlm_stats_init(tmp);
102 * Add client export data to the MGS. This data is currently NOT stored on
103 * disk in the last_rcvd file or anywhere else. In the event of a MGS
104 * crash all connections are treated as new connections.
106 int mgs_client_add(struct obd_device *obd, struct obd_export *exp,
112 /* Remove client export data from the MGS */
113 int mgs_client_free(struct obd_export *exp)
118 /* Same as mds_lvfs_fid2dentry */
119 /* Look up an entry by inode number. */
120 /* this function ONLY returns valid dget'd dentries with an initialized inode
122 static struct dentry *mgs_lvfs_fid2dentry(__u64 id, __u32 gen,
123 __u64 gr, void *data)
125 struct fsfilt_fid fid;
126 struct obd_device *obd = (struct obd_device *)data;
127 struct mgs_device *mgs = lu2mgs_dev(obd->obd_lu_dev);
130 CDEBUG(D_DENTRY, "--> mgs_fid2dentry: ino/gen %lu/%u, sb %p\n",
131 (unsigned long)id, gen, mgs->mgs_sb);
134 RETURN(ERR_PTR(-ESTALE));
139 RETURN(fsfilt_fid2dentry(obd, mgs->mgs_vfsmnt, &fid, 0));
142 struct lvfs_callback_ops mgs_lvfs_ops = {
143 l_fid2dentry: mgs_lvfs_fid2dentry,
146 int mgs_fs_setup(const struct lu_env *env, struct mgs_device *mgs)
148 struct obd_device *obd = mgs->mgs_obd;
149 struct dt_device_param p;
150 struct vfsmount *mnt;
151 struct lvfs_run_ctxt saved;
152 struct dentry *dentry;
156 dt_conf_get(env, mgs->mgs_bottom, &p);
159 CERROR("%s: no proper support for OSD yet\n", obd->obd_name);
163 /* FIXME what's this? Do I need it? */
164 rc = cfs_cleanup_group_info();
168 mgs->mgs_vfsmnt = mnt;
169 mgs->mgs_sb = mnt->mnt_root->d_inode->i_sb;
171 obd->obd_fsops = fsfilt_get_ops(mt_str(p.ddp_mount_type));
172 if (IS_ERR(obd->obd_fsops))
173 RETURN(PTR_ERR(obd->obd_fsops));
175 rc = fsfilt_setup(obd, mgs->mgs_sb);
179 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
180 obd->obd_lvfs_ctxt.pwdmnt = mnt;
181 obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
182 obd->obd_lvfs_ctxt.fs = get_ds();
183 obd->obd_lvfs_ctxt.cb_ops = mgs_lvfs_ops;
185 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
187 /* Setup the configs dir */
188 dentry = simple_mkdir(cfs_fs_pwd(current->fs), mnt, MOUNT_CONFIGS_DIR, 0777, 1);
189 if (IS_ERR(dentry)) {
190 rc = PTR_ERR(dentry);
191 CERROR("cannot create %s directory: rc = %d\n",
192 MOUNT_CONFIGS_DIR, rc);
195 mgs->mgs_configs_dir = dentry;
197 /* create directory to store nid table versions */
198 dentry = simple_mkdir(cfs_fs_pwd(current->fs), mnt, MGS_NIDTBL_DIR,
200 if (IS_ERR(dentry)) {
201 rc = PTR_ERR(dentry);
202 CERROR("cannot create %s directory: rc = %d\n",
203 MOUNT_CONFIGS_DIR, rc);
210 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
214 int mgs_fs_cleanup(const struct lu_env *env, struct mgs_device *mgs)
216 struct obd_device *obd = mgs->mgs_obd;
217 struct lvfs_run_ctxt saved;
220 class_disconnect_exports(obd); /* cleans up client info too */
222 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
224 if (mgs->mgs_configs_dir) {
225 l_dput(mgs->mgs_configs_dir);
226 mgs->mgs_configs_dir = NULL;
229 shrink_dcache_sb(mgs->mgs_sb);
231 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
234 fsfilt_put_ops(obd->obd_fsops);