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14 * in the LICENSE file that accompanied this code).
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33 * This file is part of Lustre, http://www.lustre.org/
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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 <lustre_fid.h>
47 #include "mgs_internal.h"
50 * Initialize MGS per-export statistics.
52 * This function sets up procfs entries for various MGS export counters. These
53 * counters are for per-client statistics tracked on the server.
55 * \param[in] obd OBD device
56 * \param[in] exp OBD export
57 * \param[in] localdata NID of client
59 * \retval 0 if successful
60 * \retval negative value on error
62 int mgs_export_stats_init(struct obd_device *obd, struct obd_export *exp,
65 lnet_nid_t *client_nid = localdata;
66 struct nid_stat *stats;
70 rc = lprocfs_exp_setup(exp, client_nid);
72 /* Mask error for already created /proc entries */
73 RETURN(rc == -EALREADY ? 0 : rc);
75 stats = exp->exp_nid_stats;
76 stats->nid_stats = lprocfs_alloc_stats(NUM_OBD_STATS + LPROC_MGS_LAST,
77 LPROCFS_STATS_FLAG_NOPERCPU);
78 if (stats->nid_stats == NULL)
81 lprocfs_init_ops_stats(LPROC_MGS_LAST, stats->nid_stats);
83 mgs_stats_counter_init(stats->nid_stats);
85 rc = lprocfs_register_stats(stats->nid_proc, "stats", stats->nid_stats);
87 lprocfs_free_stats(&stats->nid_stats);
91 rc = lprocfs_nid_ldlm_stats_init(stats);
100 * Add client export data to the MGS. This data is currently NOT stored on
101 * disk in the last_rcvd file or anywhere else. In the event of a MGS
102 * crash all connections are treated as new connections.
104 int mgs_client_add(struct obd_device *obd, struct obd_export *exp,
110 /* Remove client export data from the MGS */
111 int mgs_client_free(struct obd_export *exp)
116 int mgs_fs_setup(const struct lu_env *env, struct mgs_device *mgs)
121 struct dt_object *root;
126 OBD_SET_CTXT_MAGIC(&mgs->mgs_obd->obd_lvfs_ctxt);
127 mgs->mgs_obd->obd_lvfs_ctxt.dt = mgs->mgs_bottom;
129 /* XXX: fix when support for N:1 layering is implemented */
130 LASSERT(mgs->mgs_dt_dev.dd_lu_dev.ld_site);
131 mgs->mgs_dt_dev.dd_lu_dev.ld_site->ls_top_dev =
132 &mgs->mgs_dt_dev.dd_lu_dev;
134 /* Setup the configs dir */
135 fid.f_seq = FID_SEQ_LOCAL_NAME;
138 rc = local_oid_storage_init(env, mgs->mgs_bottom, &fid, &mgs->mgs_los);
142 rc = dt_root_get(env, mgs->mgs_bottom, &rfid);
146 root = dt_locate_at(env, mgs->mgs_bottom, &rfid,
147 &mgs->mgs_dt_dev.dd_lu_dev, NULL);
148 if (unlikely(IS_ERR(root)))
149 GOTO(out_los, rc = PTR_ERR(root));
151 o = local_file_find_or_create(env, mgs->mgs_los, root,
153 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
155 GOTO(out_root, rc = PTR_ERR(o));
157 if (!dt_try_as_dir(env, o)) {
158 lu_object_put(env, &o->do_lu);
159 GOTO(out_root, rc = -ENOTDIR);
162 mgs->mgs_configs_dir = o;
164 /* create directory to store nid table versions */
165 o = local_file_find_or_create(env, mgs->mgs_los, root, MGS_NIDTBL_DIR,
166 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
168 lu_object_put(env, &mgs->mgs_configs_dir->do_lu);
169 mgs->mgs_configs_dir = NULL;
170 GOTO(out_root, rc = PTR_ERR(o));
173 mgs->mgs_nidtbl_dir = o;
176 lu_object_put(env, &root->do_lu);
179 local_oid_storage_fini(env, mgs->mgs_los);
183 mgs->mgs_dt_dev.dd_lu_dev.ld_site->ls_top_dev = NULL;
188 int mgs_fs_cleanup(const struct lu_env *env, struct mgs_device *mgs)
190 if (mgs->mgs_configs_dir) {
191 lu_object_put(env, &mgs->mgs_configs_dir->do_lu);
192 mgs->mgs_configs_dir = NULL;
194 if (mgs->mgs_nidtbl_dir) {
195 lu_object_put(env, &mgs->mgs_nidtbl_dir->do_lu);
196 mgs->mgs_nidtbl_dir = NULL;
199 local_oid_storage_fini(env, mgs->mgs_los);