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LU-6447 mdt: mdt_identity_upcall to not block with rwlock held
[fs/lustre-release.git] / lustre / mdt / mdt_lproc.c
index d9347fc..5141394 100644 (file)
@@ -1,6 +1,4 @@
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
  * GPL HEADER START
  *
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  * GPL HEADER END
  */
 /*
- * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2014, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
  * Author: Fan Yong <fanyong@clusterfs.com>
  */
 
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
 #define DEBUG_SUBSYSTEM S_MDS
 
 #include <linux/version.h>
 #include <asm/statfs.h>
 
 #include <linux/module.h>
-
+#include <lnet/nidstr.h>
 /* LUSTRE_VERSION_CODE */
 #include <lustre_ver.h>
 /*
 #include <obd.h>
 #include <obd_class.h>
 #include <lustre_mds.h>
-#include <lustre_mdt.h>
 #include <lprocfs_status.h>
-#include <lu_time.h>
 #include "mdt_internal.h"
-#include <lnet/lib-lnet.h>
 
-static const char *mdt_proc_names[LPROC_MDT_NR] = {
-};
+/**
+ * The rename stats output would be YAML formats, like
+ * rename_stats:
+ * - snapshot_time: 1234567890.123456
+ * - same_dir:
+ *     4kB: { samples: 1230, pct: 33, cum_pct: 45 }
+ *     8kB: { samples: 1242, pct: 33, cum_pct: 78 }
+ *     16kB: { samples: 132, pct: 3, cum_pct: 81 }
+ * - crossdir_src:
+ *     4kB: { samples: 123, pct: 33, cum_pct: 45 }
+ *     8kB: { samples: 124, pct: 33, cum_pct: 78 }
+ *     16kB: { samples: 12, pct: 3, cum_pct: 81 }
+ * - crossdir_tgt:
+ *     4kB: { samples: 123, pct: 33, cum_pct: 45 }
+ *     8kB: { samples: 124, pct: 33, cum_pct: 78 }
+ *     16kB: { samples: 12, pct: 3, cum_pct: 81 }
+ **/
+
+#define pct(a, b) (b ? a * 100 / b : 0)
+
+static void display_rename_stats(struct seq_file *seq, char *name,
+                                 struct obd_histogram *hist)
+{
+        unsigned long tot, t, cum = 0;
+        int i;
+
+        tot = lprocfs_oh_sum(hist);
+        if (tot > 0)
+                seq_printf(seq, "- %-15s\n", name);
+        /* dir size start from 4K, start i from 10(2^10) here */
+        for (i = 0; i < OBD_HIST_MAX; i++) {
+                t = hist->oh_buckets[i];
+                cum += t;
+                if (cum == 0)
+                        continue;
 
-int mdt_procfs_init(struct mdt_device *mdt, const char *name)
-{
-        struct lu_device *ld = &mdt->mdt_md_dev.md_lu_dev;
-        struct obd_device *obd = ld->ld_obd;
-        struct lprocfs_static_vars lvars;
-        int rc;
-        ENTRY;
+                if (i < 10)
+                        seq_printf(seq, "%6s%d%s", " ", 1<< i, "bytes:");
+                else if (i < 20)
+                        seq_printf(seq, "%6s%d%s", " ", 1<<(i-10), "KB:");
+                else
+                        seq_printf(seq, "%6s%d%s", " ", 1<<(i-20), "MB:");
 
-        LASSERT(name != NULL);
+                seq_printf(seq, " { sample: %3lu, pct: %3lu, cum_pct: %3lu }\n",
+                           t, pct(t, tot), pct(cum, tot));
 
-        lprocfs_mdt_init_vars(&lvars);
-        rc = lprocfs_obd_setup(obd, lvars.obd_vars);
-        if (rc) {
-                CERROR("Can't init lprocfs, rc %d\n", rc);
-                return rc;
+                if (cum == tot)
+                        break;
         }
-        ptlrpc_lprocfs_register_obd(obd);
-
-        mdt->mdt_proc_entry = obd->obd_proc_entry;
-        LASSERT(mdt->mdt_proc_entry != NULL);
+}
 
-        rc = lu_time_init(&mdt->mdt_stats, mdt->mdt_proc_entry,
-                          mdt_proc_names, ARRAY_SIZE(mdt_proc_names));
-        if (rc == 0)
-                rc = lu_time_named_init(&ld->ld_site->ls_time_stats,
-                                        "site_time", mdt->mdt_proc_entry,
-                                         lu_time_names,
-                                         ARRAY_SIZE(lu_time_names));
-        if (rc)
-                return rc;
+static void rename_stats_show(struct seq_file *seq,
+                              struct rename_stats *rename_stats)
+{
+        struct timeval now;
 
-        obd->obd_proc_exports_entry = proc_mkdir("exports",
-                                                 obd->obd_proc_entry);
-        if (obd->obd_proc_exports_entry)
-                lprocfs_add_simple(obd->obd_proc_exports_entry,
-                                   "clear", lprocfs_nid_stats_clear_read,
-                                   lprocfs_nid_stats_clear_write, obd, NULL);
-        rc = lprocfs_alloc_md_stats(obd, LPROC_MDT_NR);
+        /* this sampling races with updates */
+        do_gettimeofday(&now);
+        seq_printf(seq, "rename_stats:\n");
+        seq_printf(seq, "- %-15s %lu.%lu\n", "snapshot_time:",
+                   now.tv_sec, now.tv_usec);
 
-        RETURN(rc);
+        display_rename_stats(seq, "same_dir",
+                             &rename_stats->hist[RENAME_SAMEDIR_SIZE]);
+        display_rename_stats(seq, "crossdir_src",
+                             &rename_stats->hist[RENAME_CROSSDIR_SRC_SIZE]);
+        display_rename_stats(seq, "crossdir_tgt",
+                             &rename_stats->hist[RENAME_CROSSDIR_TGT_SIZE]);
 }
 
-int mdt_procfs_fini(struct mdt_device *mdt)
+#undef pct
+
+static int mdt_rename_stats_seq_show(struct seq_file *seq, void *v)
 {
-        struct lu_device *ld = &mdt->mdt_md_dev.md_lu_dev;
-        struct obd_device *obd = ld->ld_obd;
+        struct mdt_device *mdt = seq->private;
 
-        if (mdt->mdt_proc_entry) {
-                lu_time_fini(&ld->ld_site->ls_time_stats);
-                lu_time_fini(&mdt->mdt_stats);
-                mdt->mdt_proc_entry = NULL;
-        }
-        if (obd->obd_proc_exports_entry) {
-                lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
-                obd->obd_proc_exports_entry = NULL;
-        }
-        ptlrpc_lprocfs_unregister_obd(obd);
-        lprocfs_free_md_stats(obd);
-        lprocfs_obd_cleanup(obd);
+        rename_stats_show(seq, &mdt->mdt_rename_stats);
 
-        RETURN(0);
+        return 0;
 }
 
-void mdt_time_start(const struct mdt_thread_info *info)
+static ssize_t
+mdt_rename_stats_seq_write(struct file *file, const char __user *buf,
+                          size_t len, loff_t *off)
 {
-        lu_lprocfs_time_start(info->mti_env);
-}
+        struct seq_file *seq = file->private_data;
+        struct mdt_device *mdt = seq->private;
+        int i;
 
-void mdt_time_end(const struct mdt_thread_info *info, int idx)
-{
-        lu_lprocfs_time_end(info->mti_env, info->mti_mdt->mdt_stats, idx);
+        for (i = 0; i < RENAME_LAST; i++)
+                lprocfs_oh_clear(&mdt->mdt_rename_stats.hist[i]);
+
+        return len;
 }
+LPROC_SEQ_FOPS(mdt_rename_stats);
 
-static int lprocfs_rd_identity_expire(char *page, char **start, off_t off,
-                                      int count, int *eof, void *data)
+static int lproc_mdt_attach_rename_seqstat(struct mdt_device *mdt)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       int i;
+
+       for (i = 0; i < RENAME_LAST; i++)
+               spin_lock_init(&mdt->mdt_rename_stats.hist[i].oh_lock);
 
-        *eof = 1;
-        return snprintf(page, count, "%lu\n",
-                        mdt->mdt_identity_cache->uc_entry_expire / HZ);
+       return lprocfs_obd_seq_create(mdt2obd_dev(mdt), "rename_stats", 0644,
+                                     &mdt_rename_stats_fops, mdt);
 }
 
-static int lprocfs_wr_identity_expire(struct file *file, const char *buffer,
-                                      unsigned long count, void *data)
+void mdt_rename_counter_tally(struct mdt_thread_info *info,
+                             struct mdt_device *mdt,
+                             struct ptlrpc_request *req,
+                             struct mdt_object *src,
+                             struct mdt_object *tgt)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int rc, val;
+        struct md_attr *ma = &info->mti_attr;
+        struct rename_stats *rstats = &mdt->mdt_rename_stats;
+        int rc;
+
+        ma->ma_need = MA_INODE;
+        ma->ma_valid = 0;
+        rc = mo_attr_get(info->mti_env, mdt_object_child(src), ma);
+        if (rc) {
+                CERROR("%s: "DFID" attr_get, rc = %d\n",
+                      mdt_obd_name(mdt), PFID(mdt_object_fid(src)), rc);
+                return;
+        }
+
+        if (src == tgt) {
+               mdt_counter_incr(req, LPROC_MDT_SAMEDIR_RENAME);
+                lprocfs_oh_tally_log2(&rstats->hist[RENAME_SAMEDIR_SIZE],
+                                      (unsigned int)ma->ma_attr.la_size);
+                return;
+        }
+
+       mdt_counter_incr(req, LPROC_MDT_CROSSDIR_RENAME);
+        lprocfs_oh_tally_log2(&rstats->hist[RENAME_CROSSDIR_SRC_SIZE],
+                              (unsigned int)ma->ma_attr.la_size);
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+        ma->ma_need = MA_INODE;
+        ma->ma_valid = 0;
+        rc = mo_attr_get(info->mti_env, mdt_object_child(tgt), ma);
+        if (rc) {
+                CERROR("%s: "DFID" attr_get, rc = %d\n",
+                      mdt_obd_name(mdt), PFID(mdt_object_fid(tgt)), rc);
+                return;
+        }
 
-        mdt->mdt_identity_cache->uc_entry_expire = val * HZ;
-        return count;
+        lprocfs_oh_tally_log2(&rstats->hist[RENAME_CROSSDIR_TGT_SIZE],
+                              (unsigned int)ma->ma_attr.la_size);
 }
 
-static int lprocfs_rd_identity_acquire_expire(char *page, char **start,
-                                              off_t off, int count, int *eof,
-                                              void *data)
+static int mdt_identity_expire_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        *eof = 1;
-        return snprintf(page, count, "%lu\n",
-                        mdt->mdt_identity_cache->uc_acquire_expire / HZ);
+       seq_printf(m, "%u\n", mdt->mdt_identity_cache->uc_entry_expire);
+       return 0;
 }
 
-static int lprocfs_wr_identity_acquire_expire(struct file *file,
-                                              const char *buffer,
-                                              unsigned long count,
-                                              void *data)
+static ssize_t
+mdt_identity_expire_seq_write(struct file *file, const char __user *buffer,
+                             size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int rc, val;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       int rc;
+       __s64 val;
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       rc = lprocfs_str_to_s64(buffer, count, &val);
+       if (rc)
+               return rc;
+       if (val < 0 || val > INT_MAX)
+               return -ERANGE;
 
-        mdt->mdt_identity_cache->uc_acquire_expire = val * HZ;
-        return count;
+       mdt->mdt_identity_cache->uc_entry_expire = val;
+
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_identity_expire);
 
-static int lprocfs_rd_identity_upcall(char *page, char **start, off_t off,
-                                      int count, int *eof, void *data)
+static int mdt_identity_acquire_expire_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        struct upcall_cache *hash = mdt->mdt_identity_cache;
-        int len;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        *eof = 1;
-        read_lock(&hash->uc_upcall_rwlock);
-        len = snprintf(page, count, "%s\n", hash->uc_upcall);
-        read_unlock(&hash->uc_upcall_rwlock);
-        return len;
+       seq_printf(m, "%u\n", mdt->mdt_identity_cache->uc_acquire_expire);
+       return 0;
 }
 
-static int lprocfs_wr_identity_upcall(struct file *file, const char *buffer,
-                                      unsigned long count, void *data)
+static ssize_t
+mdt_identity_acquire_expire_seq_write(struct file *file,
+                                     const char __user *buffer,
+                                     size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        struct upcall_cache *hash = mdt->mdt_identity_cache;
-        char kernbuf[UC_CACHE_UPCALL_MAXPATH] = { '\0' };
-
-        if (count >= UC_CACHE_UPCALL_MAXPATH) {
-                CERROR("%s: identity upcall too long\n", obd->obd_name);
-                return -EINVAL;
-        }
-
-        if (copy_from_user(kernbuf, buffer, min_t(unsigned long, count,
-                                                  UC_CACHE_UPCALL_MAXPATH - 1)))
-                return -EFAULT;
-
-        /* Remove any extraneous bits from the upcall (e.g. linefeeds) */
-        write_lock(&hash->uc_upcall_rwlock);
-        sscanf(kernbuf, "%s", hash->uc_upcall);
-        write_unlock(&hash->uc_upcall_rwlock);
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       int rc;
+       __s64 val;
 
-        if (strcmp(hash->uc_name, obd->obd_name) != 0)
-                CWARN("%s: write to upcall name %s\n",
-                      obd->obd_name, hash->uc_upcall);
+       rc = lprocfs_str_to_s64(buffer, count, &val);
+       if (rc)
+               return rc;
+       if (val < 0 || val > INT_MAX)
+               return -ERANGE;
 
-        if (strcmp(hash->uc_upcall, "NONE") == 0 && mdt->mdt_opts.mo_acl)
-                CWARN("%s: disable \"identity_upcall\" with ACL enabled maybe "
-                      "cause unexpected \"EACCESS\"\n", obd->obd_name);
+       mdt->mdt_identity_cache->uc_acquire_expire = val;
 
-        CWARN("%s: identity upcall set to %s\n", obd->obd_name, hash->uc_upcall);
-        return count;
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_identity_acquire_expire);
 
-static int lprocfs_wr_identity_flush(struct file *file, const char *buffer,
-                                     unsigned long count, void *data)
+static int mdt_identity_upcall_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int rc, uid;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct upcall_cache *hash = mdt->mdt_identity_cache;
 
-        rc = lprocfs_write_helper(buffer, count, &uid);
-        if (rc)
-                return rc;
-
-        mdt_flush_identity(mdt->mdt_identity_cache, uid);
-        return count;
+       down_read(&hash->uc_upcall_rwsem);
+       seq_printf(m, "%s\n", hash->uc_upcall);
+       up_read(&hash->uc_upcall_rwsem);
+       return 0;
 }
 
-static int lprocfs_wr_identity_info(struct file *file, const char *buffer,
-                                    unsigned long count, void *data)
+static ssize_t
+mdt_identity_upcall_seq_write(struct file *file, const char __user *buffer,
+                             size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        struct identity_downcall_data sparam, *param = &sparam;
-        int size = 0, rc = 0;
+       struct seq_file         *m = file->private_data;
+       struct obd_device       *obd = m->private;
+       struct mdt_device       *mdt = mdt_dev(obd->obd_lu_dev);
+       struct upcall_cache     *hash = mdt->mdt_identity_cache;
+       int                      rc;
+       char                    *kernbuf;
 
-        if (count < sizeof(*param)) {
-                CERROR("%s: invalid data size %lu\n", obd->obd_name, count);
-                return count;
-        }
+       if (count >= UC_CACHE_UPCALL_MAXPATH) {
+               CERROR("%s: identity upcall too long\n", mdt_obd_name(mdt));
+               return -EINVAL;
+       }
+       OBD_ALLOC(kernbuf, count + 1);
+       if (kernbuf == NULL)
+               GOTO(failed, rc = -ENOMEM);
+       if (copy_from_user(kernbuf, buffer, count))
+               GOTO(failed, rc = -EFAULT);
 
-        if (copy_from_user(&sparam, buffer, sizeof(sparam))) {
-                CERROR("%s: bad identity data\n", obd->obd_name);
-                GOTO(out, rc = -EFAULT);
-        }
+       /* Remove any extraneous bits from the upcall (e.g. linefeeds) */
+       down_write(&hash->uc_upcall_rwsem);
+       sscanf(kernbuf, "%s", hash->uc_upcall);
+       up_write(&hash->uc_upcall_rwsem);
 
-        if (sparam.idd_magic != IDENTITY_DOWNCALL_MAGIC) {
-                CERROR("%s: MDS identity downcall bad params\n", obd->obd_name);
-                GOTO(out, rc = -EINVAL);
-        }
+       if (strcmp(hash->uc_name, mdt_obd_name(mdt)) != 0)
+               CWARN("%s: write to upcall name %s\n",
+                     mdt_obd_name(mdt), hash->uc_upcall);
 
-        if (sparam.idd_nperms > N_PERMS_MAX) {
-                CERROR("%s: perm count %d more than maximum %d\n",
-                       obd->obd_name, sparam.idd_nperms, N_PERMS_MAX);
-                GOTO(out, rc = -EINVAL);
-        }
-
-        if (sparam.idd_ngroups > NGROUPS_MAX) {
-                CERROR("%s: group count %d more than maximum %d\n",
-                       obd->obd_name, sparam.idd_ngroups, NGROUPS_MAX);
-                GOTO(out, rc = -EINVAL);
-        }
+       if (strcmp(hash->uc_upcall, "NONE") == 0 && mdt->mdt_opts.mo_acl)
+               CWARN("%s: disable \"identity_upcall\" with ACL enabled maybe "
+                     "cause unexpected \"EACCESS\"\n", mdt_obd_name(mdt));
 
-        if (sparam.idd_ngroups) {
-                size = offsetof(struct identity_downcall_data,
-                                idd_groups[sparam.idd_ngroups]);
-                OBD_ALLOC(param, size);
-                if (!param) {
-                        CERROR("%s: fail to alloc %d bytes for uid %u"
-                               " with %d groups\n", obd->obd_name, size,
-                               sparam.idd_uid, sparam.idd_ngroups);
-                        param = &sparam;
-                        param->idd_ngroups = 0;
-                } else if (copy_from_user(param, buffer, size)) {
-                        CERROR("%s: uid %u bad supplementary group data\n",
-                               obd->obd_name, sparam.idd_uid);
-                        OBD_FREE(param, size);
-                        param = &sparam;
-                        param->idd_ngroups = 0;
-                }
-        }
+       CDEBUG(D_CONFIG, "%s: identity upcall set to %s\n", mdt_obd_name(mdt),
+              hash->uc_upcall);
+       OBD_FREE(kernbuf, count + 1);
+       RETURN(count);
 
-        rc = upcall_cache_downcall(mdt->mdt_identity_cache, param->idd_err,
-                                   param->idd_uid, param);
+ failed:
+       if (kernbuf)
+               OBD_FREE(kernbuf, count + 1);
+       RETURN(rc);
+}
+LPROC_SEQ_FOPS(mdt_identity_upcall);
+
+static ssize_t
+lprocfs_identity_flush_seq_write(struct file *file, const char __user *buffer,
+                                size_t count, void *data)
+{
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       int rc;
+       __s64 uid;
+
+       rc = lprocfs_str_to_s64(buffer, count, &uid);
+       if (rc)
+               return rc;
+       if (uid < INT_MIN || uid > INT_MAX)
+               return -ERANGE;
+
+       mdt_flush_identity(mdt->mdt_identity_cache, uid);
+       return count;
+}
+LPROC_SEQ_FOPS_WO_TYPE(mdt, identity_flush);
+
+static ssize_t
+lprocfs_identity_info_seq_write(struct file *file, const char __user *buffer,
+                               size_t count, void *data)
+{
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct identity_downcall_data *param;
+       int size = sizeof(*param), rc, checked = 0;
+
+again:
+       if (count < size) {
+               CERROR("%s: invalid data count = %lu, size = %d\n",
+                      mdt_obd_name(mdt), (unsigned long) count, size);
+               return -EINVAL;
+       }
+
+       OBD_ALLOC(param, size);
+       if (param == NULL)
+               return -ENOMEM;
+
+       if (copy_from_user(param, buffer, size)) {
+               CERROR("%s: bad identity data\n", mdt_obd_name(mdt));
+               GOTO(out, rc = -EFAULT);
+       }
+
+       if (checked == 0) {
+               checked = 1;
+               if (param->idd_magic != IDENTITY_DOWNCALL_MAGIC) {
+                       CERROR("%s: MDS identity downcall bad params\n",
+                              mdt_obd_name(mdt));
+                       GOTO(out, rc = -EINVAL);
+               }
+
+               if (param->idd_nperms > N_PERMS_MAX) {
+                       CERROR("%s: perm count %d more than maximum %d\n",
+                              mdt_obd_name(mdt), param->idd_nperms,
+                              N_PERMS_MAX);
+                       GOTO(out, rc = -EINVAL);
+               }
+
+               if (param->idd_ngroups > NGROUPS_MAX) {
+                       CERROR("%s: group count %d more than maximum %d\n",
+                              mdt_obd_name(mdt), param->idd_ngroups,
+                              NGROUPS_MAX);
+                       GOTO(out, rc = -EINVAL);
+               }
+
+               if (param->idd_ngroups) {
+                       rc = param->idd_ngroups; /* save idd_ngroups */
+                       OBD_FREE(param, size);
+                       size = offsetof(struct identity_downcall_data,
+                                       idd_groups[rc]);
+                       goto again;
+               }
+       }
+
+       rc = upcall_cache_downcall(mdt->mdt_identity_cache, param->idd_err,
+                                  param->idd_uid, param);
 
 out:
-        if (param && (param != &sparam))
-                OBD_FREE(param, size);
+       if (param != NULL)
+               OBD_FREE(param, size);
 
-        return rc ?: count;
+       return rc ? rc : count;
 }
+LPROC_SEQ_FOPS_WO_TYPE(mdt, identity_info);
 
-/* for debug only */
-static int lprocfs_rd_capa(char *page, char **start, off_t off,
-                           int count, int *eof, void *data)
+static int mdt_site_stats_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        return snprintf(page, count, "capability on: %s %s\n",
-                        mdt->mdt_opts.mo_oss_capa ? "oss" : "",
-                        mdt->mdt_opts.mo_mds_capa ? "mds" : "");
+       return lu_site_stats_seq_print(mdt_lu_site(mdt), m);
 }
+LPROC_SEQ_FOPS_RO(mdt_site_stats);
 
-static int lprocfs_wr_capa(struct file *file, const char *buffer,
-                           unsigned long count, void *data)
+#define BUFLEN (UUID_MAX + 4)
+
+static ssize_t
+lprocfs_mds_evict_client_seq_write(struct file *file, const char __user *buf,
+                                  size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int val, rc;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       char *kbuf;
+       char *tmpbuf;
+       int rc = 0;
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       OBD_ALLOC(kbuf, BUFLEN);
+       if (kbuf == NULL)
+               return -ENOMEM;
 
-        if (val < 0 || val > 3) {
-                CERROR("invalid capability mode, only 0/2/3 is accepted.\n"
-                       " 0:  disable fid capability\n"
-                       " 2:  enable MDS fid capability\n"
-                       " 3:  enable both MDS and OSS fid capability\n");
-                return -EINVAL;
-        }
+       /*
+        * OBD_ALLOC() will zero kbuf, but we only copy BUFLEN - 1
+        * bytes into kbuf, to ensure that the string is NUL-terminated.
+        * UUID_MAX should include a trailing NUL already.
+        */
+       if (copy_from_user(kbuf, buf, min_t(unsigned long, BUFLEN - 1, count)))
+               GOTO(out, rc = -EFAULT);
+       tmpbuf = cfs_firststr(kbuf, min_t(unsigned long, BUFLEN - 1, count));
+
+       if (strncmp(tmpbuf, "nid:", 4) != 0) {
+               count = lprocfs_evict_client_seq_write(file, buf, count, off);
+               goto out;
+       }
+
+       if (mdt->mdt_opts.mo_evict_tgt_nids) {
+               rc = obd_set_info_async(NULL, mdt->mdt_child_exp,
+                                       sizeof(KEY_EVICT_BY_NID),
+                                       KEY_EVICT_BY_NID,
+                                       strlen(tmpbuf + 4) + 1,
+                                       tmpbuf + 4, NULL);
+               if (rc)
+                       CERROR("Failed to evict nid %s from OSTs: rc %d\n",
+                              tmpbuf + 4, rc);
+       }
+
+       /* See the comments in function lprocfs_wr_evict_client()
+        * in ptlrpc/lproc_ptlrpc.c for details. - jay */
+       class_incref(obd, __func__, current);
+       obd_export_evict_by_nid(obd, tmpbuf + 4);
+       class_decref(obd, __func__, current);
 
-        /* OSS fid capability needs enable both MDS and OSS fid capability on
-         * MDS */
-        if (val == 1) {
-                CERROR("can't enable OSS fid capability only, you should use "
-                       "'3' to enable both MDS and OSS fid capability.\n");
-                return -EINVAL;
-        }
 
-        mdt->mdt_opts.mo_oss_capa = (val & 0x1);
-        mdt->mdt_opts.mo_mds_capa = !!(val & 0x2);
-        mdt->mdt_capa_conf = 1;
-        LCONSOLE_INFO("MDS %s %s MDS fid capability.\n",
-                      obd->obd_name,
-                      mdt->mdt_opts.mo_mds_capa ? "enabled" : "disabled");
-        LCONSOLE_INFO("MDS %s %s OSS fid capability.\n",
-                      obd->obd_name,
-                      mdt->mdt_opts.mo_oss_capa ? "enabled" : "disabled");
-        return count;
+out:
+       OBD_FREE(kbuf, BUFLEN);
+       return rc < 0 ? rc : count;
 }
 
-static int lprocfs_rd_capa_count(char *page, char **start, off_t off,
-                                 int count, int *eof, void *data)
+#undef BUFLEN
+
+static int mdt_evict_tgt_nids_seq_show(struct seq_file *m, void *data)
 {
-        return snprintf(page, count, "%d %d\n",
-                        capa_count[CAPA_SITE_CLIENT],
-                        capa_count[CAPA_SITE_SERVER]);
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+
+       seq_printf(m, "%u\n", mdt->mdt_opts.mo_evict_tgt_nids);
+       return 0;
 }
 
-static int lprocfs_rd_site_stats(char *page, char **start, off_t off,
-                                 int count, int *eof, void *data)
+static ssize_t
+mdt_evict_tgt_nids_seq_write(struct file *file, const char __user *buffer,
+                              size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       __s64 val;
+       int rc;
 
-        return lu_site_stats_print(mdt_lu_site(mdt), page, count);
+       rc = lprocfs_str_to_s64(buffer, count, &val);
+       if (rc)
+               return rc;
+       mdt->mdt_opts.mo_evict_tgt_nids = !!val;
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_evict_tgt_nids);
 
-static int lprocfs_rd_capa_timeout(char *page, char **start, off_t off,
-                                   int count, int *eof, void *data)
+static int mdt_cos_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        return snprintf(page, count, "%lu\n", mdt->mdt_capa_timeout);
+       seq_printf(m, "%u\n", mdt_cos_is_enabled(mdt));
+       return 0;
 }
 
-static int lprocfs_wr_capa_timeout(struct file *file, const char *buffer,
-                                   unsigned long count, void *data)
+static ssize_t
+mdt_cos_seq_write(struct file *file, const char __user *buffer,
+                 size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int val, rc;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       int rc;
+       __s64 val;
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       rc = lprocfs_str_to_s64(buffer, count, &val);
+       if (rc)
+               return rc;
+       if (val < INT_MIN || val > INT_MAX)
+               return -ERANGE;
 
-        mdt->mdt_capa_timeout = (unsigned long)val;
-        mdt->mdt_capa_conf = 1;
-        return count;
+       mdt_enable_cos(mdt, val);
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_cos);
 
-static int lprocfs_rd_ck_timeout(char *page, char **start, off_t off, int count,
-                                 int *eof, void *data)
+static int mdt_root_squash_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct root_squash_info *squash = &mdt->mdt_squash;
 
-        return snprintf(page, count, "%lu\n", mdt->mdt_ck_timeout);
+       seq_printf(m, "%u:%u\n", squash->rsi_uid,
+                  squash->rsi_gid);
+       return 0;
 }
 
-static int lprocfs_wr_ck_timeout(struct file *file, const char *buffer,
-                                 unsigned long count, void *data)
+static ssize_t
+mdt_root_squash_seq_write(struct file *file, const char __user *buffer,
+                         size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int val, rc;
-
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct root_squash_info *squash = &mdt->mdt_squash;
 
-        mdt->mdt_ck_timeout = (unsigned long)val;
-        mdt->mdt_capa_conf = 1;
-        return count;
+       return lprocfs_wr_root_squash(buffer, count, squash,
+                                     mdt_obd_name(mdt));
 }
+LPROC_SEQ_FOPS(mdt_root_squash);
 
-static int lprocfs_mdt_wr_evict_client(struct file *file, const char *buffer,
-                                       unsigned long count, void *data)
+static int mdt_nosquash_nids_seq_show(struct seq_file *m, void *data)
 {
-        char tmpbuf[sizeof(struct obd_uuid)];
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct root_squash_info *squash = &mdt->mdt_squash;
+       int len = 0;
 
-        sscanf(buffer, "%40s", tmpbuf);
+       down_read(&squash->rsi_sem);
+       if (!list_empty(&squash->rsi_nosquash_nids)) {
+               len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
+                                       &squash->rsi_nosquash_nids);
+               m->count += len;
+               seq_putc(m, '\n');
+       } else
+               seq_puts(m, "NONE\n");
+       up_read(&squash->rsi_sem);
 
-        if (strncmp(tmpbuf, "nid:", 4) != 0)
-                return lprocfs_wr_evict_client(file, buffer, count, data);
+       return 0;
+}
 
-        CERROR("NOT implement evict client by nid %s\n", tmpbuf);
+static ssize_t
+mdt_nosquash_nids_seq_write(struct file *file, const char __user *buffer,
+                           size_t count, loff_t *off)
+{
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct root_squash_info *squash = &mdt->mdt_squash;
 
-        return count;
+       return lprocfs_wr_nosquash_nids(buffer, count, squash,
+                                       mdt_obd_name(mdt));
 }
+LPROC_SEQ_FOPS(mdt_nosquash_nids);
 
-static int lprocfs_rd_sec_level(char *page, char **start, off_t off,
-                                int count, int *eof, void *data)
+static int mdt_enable_remote_dir_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        return snprintf(page, count, "%d\n", mdt->mdt_sec_level);
+       seq_printf(m, "%u\n", mdt->mdt_enable_remote_dir);
+       return 0;
 }
 
-static int lprocfs_wr_sec_level(struct file *file, const char *buffer,
-                                unsigned long count, void *data)
+static ssize_t
+mdt_enable_remote_dir_seq_write(struct file *file, const char __user *buffer,
+                               size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int val, rc;
-
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       __s64 val;
+       int rc;
 
-        if (val > LUSTRE_SEC_ALL || val < LUSTRE_SEC_NONE)
-                return -EINVAL;
+       rc = lprocfs_str_to_s64(buffer, count, &val);
+       if (rc)
+               return rc;
 
-        if (val == LUSTRE_SEC_SPECIFY) {
-                CWARN("security level %d will be supported in future.\n",
-                      LUSTRE_SEC_SPECIFY);
-                return -EINVAL;
-        }
+       if (val > 1 || val < 0)
+               return -ERANGE;
 
-        mdt->mdt_sec_level = val;
-        return count;
+       mdt->mdt_enable_remote_dir = val;
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_enable_remote_dir);
 
-static int lprocfs_rd_cos(char *page, char **start, off_t off,
-                              int count, int *eof, void *data)
+static int mdt_enable_remote_dir_gid_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        return snprintf(page, count, "%u\n", mdt_cos_is_enabled(mdt));
+       seq_printf(m, "%d\n",
+                 (int)mdt->mdt_enable_remote_dir_gid);
+       return 0;
 }
 
-static int lprocfs_wr_cos(struct file *file, const char *buffer,
-                                  unsigned long count, void *data)
+static ssize_t
+mdt_enable_remote_dir_gid_seq_write(struct file *file,
+                                   const char __user *buffer,
+                                   size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int val, rc;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       __s64 val;
+       int rc;
+
+       rc = lprocfs_str_to_s64(buffer, count, &val);
+       if (rc)
+               return rc;
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
-        mdt_enable_cos(mdt, val);
-        return count;
+       mdt->mdt_enable_remote_dir_gid = val;
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_enable_remote_dir_gid);
 
-static int lprocfs_rd_root_squash(char *page, char **start, off_t off,
-                                  int count, int *eof, void *data)
+/**
+ * Show MDT policy for handling dirty metadata under a lock being cancelled.
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ *
+ * \retval             0 on success
+ * \retval             negative value on error
+ */
+static int mdt_slc_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        ENTRY;
+       struct obd_device *obd = m->private;
+       struct lu_target *tgt = obd->u.obt.obt_lut;
+       char *slc_states[] = {"never", "blocking", "always" };
 
-        return snprintf(page, count, "%u:%u\n", mdt->mdt_squash_uid,
-                        mdt->mdt_squash_gid);
+       seq_printf(m, "%s\n", slc_states[tgt->lut_sync_lock_cancel]);
+       return 0;
 }
+LPROC_SEQ_FOPS_RO(mdt_slc);
 
-static int safe_strtoul(const char *str, char **endp, unsigned long *res)
+/**
+ * Show MDT async commit count.
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ *
+ * \retval             0 on success
+ * \retval             negative value on error
+ */
+static int mdt_async_commit_count_seq_show(struct seq_file *m, void *data)
 {
-        char n[24];
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        *res = simple_strtoul(str, endp, 0);
-        if (str == *endp)
-                return 1;
-
-        sprintf(n, "%lu", *res);
-        if (strncmp(n, str, *endp - str))
-                /* overflow */
-                return 1;
-        return 0;
+       seq_printf(m, "%d\n", atomic_read(&mdt->mdt_async_commit_count));
+       return 0;
 }
 
-static int lprocfs_wr_root_squash(struct file *file, const char *buffer,
-                                  unsigned long count, void *data)
+static ssize_t
+mdt_async_commit_count_seq_write(struct file *file, const char __user *buffer,
+                                size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int rc;
-        char kernbuf[50], *tmp, *end, *errmsg;
-        unsigned long uid, gid;
-        int nouid, nogid;
-        ENTRY;
-
-        if (count >= sizeof(kernbuf)) {
-                errmsg = "string too long";
-                GOTO(failed, rc = -EINVAL);
-        }
-        if (copy_from_user(kernbuf, buffer, count)) {
-                errmsg = "bad address";
-                GOTO(failed, rc = -EFAULT);
-        }
-        kernbuf[count] = '\0';
-
-        nouid = nogid = 0;
-        if (safe_strtoul(buffer, &tmp, &uid)) {
-                uid = mdt->mdt_squash_uid;
-                nouid = 1;
-        }
+       struct seq_file *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       __s64 val;
+       int rc;
 
-        /* skip ':' */
-        if (*tmp == ':') {
-                tmp++;
-                if (safe_strtoul(tmp, &end, &gid)) {
-                        gid = mdt->mdt_squash_gid;
-                        nogid = 1;
-                }
-        } else {
-                gid = mdt->mdt_squash_gid;
-                nogid = 1;
-        }
-
-        mdt->mdt_squash_uid = uid;
-        mdt->mdt_squash_gid = gid;
+       rc = lprocfs_str_to_s64(buffer, count, &val);
+       if (rc)
+               return rc;
 
-        if (nouid && nogid) {
-                errmsg = "needs uid:gid format";
-                GOTO(failed, rc = -EINVAL);
-        }
+       if (val < INT_MIN || val > INT_MAX)
+               return -ERANGE;
 
-        LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
-                      obd->obd_name,
-                      mdt->mdt_squash_uid,  mdt->mdt_squash_gid);
-        RETURN(count);
+       atomic_set(&mdt->mdt_async_commit_count, val);
 
- failed:
-        CWARN("%s: failed to set root_squash to \"%s\", %s: rc %d\n",
-              obd->obd_name, buffer, errmsg, rc);
-        RETURN(rc);
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_async_commit_count);
 
-static int lprocfs_rd_nosquash_nids(char *page, char **start, off_t off,
-                                    int count, int *eof, void *data)
+/**
+ * Show MDT sync count.
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ *
+ * \retval             0 on success
+ * \retval             negative value on error
+ */
+static int mdt_sync_count_seq_show(struct seq_file *m, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct obd_device *obd = m->private;
+       struct lu_target *tgt = obd->u.obt.obt_lut;
 
-        if (mdt->mdt_nosquash_str)
-                return snprintf(page, count, "%s\n", mdt->mdt_nosquash_str);
-        return snprintf(page, count, "NONE\n");
+       seq_printf(m, "%d\n", atomic_read(&tgt->lut_sync_count));
+       return 0;
 }
 
-static int lprocfs_wr_nosquash_nids(struct file *file, const char *buffer,
-                                    unsigned long count, void *data)
+static ssize_t
+mdt_sync_count_seq_write(struct file *file, const char __user *buffer,
+                        size_t count, loff_t *off)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int rc;
-        char *kernbuf, *errmsg;
-        struct list_head tmp;
-        ENTRY;
-
-        OBD_ALLOC(kernbuf, count + 1);
-        if (kernbuf == NULL) {
-                errmsg = "no memory";
-                GOTO(failed, rc = -ENOMEM);
-        }
-        if (copy_from_user(kernbuf, buffer, count)) {
-                errmsg = "bad address";
-                GOTO(failed, rc = -EFAULT);
-        }
-        kernbuf[count] = '\0';
-
-        if (!strcmp(kernbuf, "NONE") || !strcmp(kernbuf, "clear")) {
-                /* empty string is special case */
-                down_write(&mdt->mdt_squash_sem);
-                if (!list_empty(&mdt->mdt_nosquash_nids)) {
-                        cfs_free_nidlist(&mdt->mdt_nosquash_nids);
-                        OBD_FREE(mdt->mdt_nosquash_str,
-                                 mdt->mdt_nosquash_strlen);
-                        mdt->mdt_nosquash_str = NULL;
-                        mdt->mdt_nosquash_strlen = 0;
-                }
-                up_write(&mdt->mdt_squash_sem);
-                LCONSOLE_INFO("%s: nosquash_nids is cleared\n",
-                              obd->obd_name);
-                OBD_FREE(kernbuf, count + 1);
-                RETURN(count);
-        }
+       struct seq_file *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct lu_target *tgt = obd->u.obt.obt_lut;
+       __s64 val;
+       int rc;
 
-        CFS_INIT_LIST_HEAD(&tmp);
-        if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
-                errmsg = "can't parse";
-                GOTO(failed, rc = -EINVAL);
-        }
+       rc = lprocfs_str_to_s64(buffer, count, &val);
+       if (rc)
+               return rc;
 
-        down_write(&mdt->mdt_squash_sem);
-        if (!list_empty(&mdt->mdt_nosquash_nids)) {
-                cfs_free_nidlist(&mdt->mdt_nosquash_nids);
-                OBD_FREE(mdt->mdt_nosquash_str, mdt->mdt_nosquash_strlen);
-        }
-        mdt->mdt_nosquash_str = kernbuf;
-        mdt->mdt_nosquash_strlen = count + 1;
-        list_splice(&tmp, &mdt->mdt_nosquash_nids);
+       if (val < INT_MIN || val > INT_MAX)
+               return -ERANGE;
 
-        LCONSOLE_INFO("%s: nosquash_nids is set to %s\n",
-                      obd->obd_name, kernbuf);
-        up_write(&mdt->mdt_squash_sem);
-        RETURN(count);
+       atomic_set(&tgt->lut_sync_count, val);
 
- failed:
-        CWARN("%s: failed to set nosquash_nids to \"%s\", %s: rc %d\n",
-              obd->obd_name, kernbuf, errmsg, rc);
-        if (kernbuf)
-                OBD_FREE(kernbuf, count + 1);
-        RETURN(rc);
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_sync_count);
 
-static int lprocfs_rd_mdt_som(char *page, char **start, off_t off,
-                              int count, int *eof, void *data)
-{
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        return snprintf(page, count, "%sabled\n",
-                        mdt->mdt_som_conf ? "en" : "dis");
-}
+LPROC_SEQ_FOPS_RO_TYPE(mdt, uuid);
+LPROC_SEQ_FOPS_RO_TYPE(mdt, recovery_status);
+LPROC_SEQ_FOPS_RO_TYPE(mdt, num_exports);
+LPROC_SEQ_FOPS_RO_TYPE(mdt, target_instance);
+LPROC_SEQ_FOPS_RO_TYPE(mdt, hash);
+LPROC_SEQ_FOPS_WO_TYPE(mdt, mds_evict_client);
+LPROC_SEQ_FOPS_RW_TYPE(mdt, job_interval);
+LPROC_SEQ_FOPS_RW_TYPE(mdt, ir_factor);
+LPROC_SEQ_FOPS_RW_TYPE(mdt, nid_stats_clear);
+LPROC_SEQ_FOPS(mdt_hsm_cdt_control);
 
-#ifdef HAVE_QUOTA_SUPPORT
-static int mdt_quota_off(struct mdt_device *mdt)
-{
-        struct md_device *next = mdt->mdt_child;
-        const struct md_quota_operations *mqo = &next->md_ops->mdo_quota;
-        struct lu_env env;
-        int rc;
+LPROC_SEQ_FOPS_RW_TYPE(mdt, recovery_time_hard);
+LPROC_SEQ_FOPS_RW_TYPE(mdt, recovery_time_soft);
 
-        lu_env_init(&env, LCT_MD_THREAD);
-        rc = mqo->mqo_off(&env, next, UGQUOTA | IMMQUOTA);
-        lu_env_fini(&env);
-        return rc;
-}
-#else
-static int mdt_quota_off(struct mdt_device *mdt)
-{
-        return 0;
-}
-#endif
+static struct lprocfs_vars lprocfs_mdt_obd_vars[] = {
+       { .name =       "uuid",
+         .fops =       &mdt_uuid_fops                          },
+       { .name =       "recovery_status",
+         .fops =       &mdt_recovery_status_fops               },
+       { .name =       "num_exports",
+         .fops =       &mdt_num_exports_fops                   },
+       { .name =       "identity_expire",
+         .fops =       &mdt_identity_expire_fops               },
+       { .name =       "identity_acquire_expire",
+         .fops =       &mdt_identity_acquire_expire_fops       },
+       { .name =       "identity_upcall",
+         .fops =       &mdt_identity_upcall_fops               },
+       { .name =       "identity_flush",
+         .fops =       &mdt_identity_flush_fops                },
+       { .name =       "identity_info",
+         .fops =       &mdt_identity_info_fops                 },
+       { .name =       "site_stats",
+         .fops =       &mdt_site_stats_fops                    },
+       { .name =       "evict_client",
+         .fops =       &mdt_mds_evict_client_fops              },
+       { .name =       "evict_tgt_nids",
+         .fops =       &mdt_evict_tgt_nids_fops                },
+       { .name =       "hash_stats",
+         .fops =       &mdt_hash_fops                          },
+       { .name =       "commit_on_sharing",
+         .fops =       &mdt_cos_fops                           },
+       { .name =       "root_squash",
+         .fops =       &mdt_root_squash_fops                   },
+       { .name =       "nosquash_nids",
+         .fops =       &mdt_nosquash_nids_fops                 },
+       { .name =       "instance",
+         .fops =       &mdt_target_instance_fops               },
+       { .name =       "ir_factor",
+         .fops =       &mdt_ir_factor_fops                     },
+       { .name =       "job_cleanup_interval",
+         .fops =       &mdt_job_interval_fops                  },
+       { .name =       "enable_remote_dir",
+         .fops =       &mdt_enable_remote_dir_fops             },
+       { .name =       "enable_remote_dir_gid",
+         .fops =       &mdt_enable_remote_dir_gid_fops         },
+       { .name =       "hsm_control",
+         .fops =       &mdt_hsm_cdt_control_fops               },
+       { .name =       "recovery_time_hard",
+         .fops =       &mdt_recovery_time_hard_fops    },
+       { .name =       "recovery_time_soft",
+         .fops =       &mdt_recovery_time_soft_fops    },
+       { .name =       "sync_lock_cancel",
+         .fops =       &mdt_slc_fops                           },
+       { .name =       "async_commit_count",
+         .fops =       &mdt_async_commit_count_fops            },
+       { .name =       "sync_count",
+         .fops =       &mdt_sync_count_fops                    },
+       { NULL }
+};
 
-static int lprocfs_wr_mdt_som(struct file *file, const char *buffer,
-                              unsigned long count, void *data)
+static int
+lprocfs_mdt_print_open_files(struct cfs_hash *hs, struct cfs_hash_bd *bd,
+                            struct hlist_node *hnode, void *v)
 {
-        struct obd_export *exp;
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        char kernbuf[16];
-        unsigned long val = 0;
-        int rc;
+       struct obd_export       *exp = cfs_hash_object(hs, hnode);
+       struct seq_file         *seq = v;
 
-        if (count > (sizeof(kernbuf) - 1))
-                return -EINVAL;
+       if (exp->exp_lock_hash != NULL) {
+               struct mdt_export_data  *med = &exp->exp_mdt_data;
+               struct mdt_file_data    *mfd;
 
-        if (copy_from_user(kernbuf, buffer, count))
-                return -EFAULT;
+               spin_lock(&med->med_open_lock);
+               list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
+                       seq_printf(seq, DFID"\n",
+                                  PFID(mdt_object_fid(mfd->mfd_object)));
+               }
+               spin_unlock(&med->med_open_lock);
+       }
 
-        kernbuf[count] = '\0';
+       return 0;
+}
 
-        if (!strcmp(kernbuf, "enabled"))
-                val = 1;
-        else if (strcmp(kernbuf, "disabled"))
-                return -EINVAL;
+static int lprocfs_mdt_open_files_seq_show(struct seq_file *seq, void *v)
+{
+       struct nid_stat *stats = seq->private;
+       struct obd_device *obd = stats->nid_obd;
 
-        if (mdt->mdt_som_conf == val)
-                return count;
+       cfs_hash_for_each_key(obd->obd_nid_hash, &stats->nid,
+                             lprocfs_mdt_print_open_files, seq);
 
-        if (!obd->obd_process_conf) {
-                CERROR("Temporary SOM change is not supported, use lctl "
-                       "conf_param for permanent setting\n");
-                return count;
-        }
+       return 0;
+}
 
-        /* 1 stands for self export. */
-        list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
-                if (exp == obd->obd_self_export)
-                        continue;
-                if (exp->exp_connect_flags & OBD_CONNECT_MDS_MDS)
-                        continue;
-                /* Some clients are already connected, skip the change */
-                LCONSOLE_INFO("%s is already connected, SOM will be %s on "
-                              "the next mount\n", exp->exp_client_uuid.uuid,
-                              val ? "enabled" : "disabled");
-                return count;
-        }
+int lprocfs_mdt_open_files_seq_open(struct inode *inode, struct file *file)
+{
+       struct seq_file         *seq;
+       int                     rc;
 
-        if ((rc = mdt_quota_off(mdt))) {
-                if (rc == -EALREADY)
-                        rc = 0;
-                else
-                        return rc;
-        }
+       rc = single_open(file, &lprocfs_mdt_open_files_seq_show, NULL);
+       if (rc != 0)
+               return rc;
 
-        mdt->mdt_som_conf = val;
-        LCONSOLE_INFO("Enabling SOM\n");
+       seq = file->private_data;
+       seq->private = PDE_DATA(inode);
 
-        return count;
+       return 0;
 }
 
-/* Temporary; for testing purposes only */
-static int lprocfs_mdt_wr_mdc(struct file *file, const char *buffer,
-                              unsigned long count, void *data)
+void mdt_counter_incr(struct ptlrpc_request *req, int opcode)
 {
-        struct obd_device *obd = data;
-        struct obd_export *exp = NULL;
-        struct obd_uuid uuid;
-        char tmpbuf[sizeof(struct obd_uuid)];
-
-        sscanf(buffer, "%40s", tmpbuf);
-
-        obd_str2uuid(&uuid, tmpbuf);
-        exp = cfs_hash_lookup(obd->obd_uuid_hash, &uuid);
-        if (exp == NULL) {
-                CERROR("%s: no export %s found\n",
-                       obd->obd_name, obd_uuid2str(&uuid));
-        } else {
-                mdt_hsm_copytool_send(exp);
-                class_export_put(exp);
-        }
+       struct obd_export *exp = req->rq_export;
 
-        return count;
+       if (exp->exp_obd && exp->exp_obd->obd_md_stats)
+               lprocfs_counter_incr(exp->exp_obd->obd_md_stats, opcode);
+       if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
+               lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
+       if (exp->exp_obd && exp->exp_obd->u.obt.obt_jobstats.ojs_hash &&
+           (exp_connect_flags(exp) & OBD_CONNECT_JOBSTATS))
+               lprocfs_job_stats_log(exp->exp_obd,
+                                     lustre_msg_get_jobid(req->rq_reqmsg),
+                                     opcode, 1);
 }
 
-static struct lprocfs_vars lprocfs_mdt_obd_vars[] = {
-        { "uuid",                       lprocfs_rd_uuid,                 0, 0 },
-        { "recovery_status",            lprocfs_obd_rd_recovery_status,  0, 0 },
-        { "num_exports",                lprocfs_rd_num_exports,          0, 0 },
-        { "identity_expire",            lprocfs_rd_identity_expire,
-                                        lprocfs_wr_identity_expire,         0 },
-        { "identity_acquire_expire",    lprocfs_rd_identity_acquire_expire,
-                                        lprocfs_wr_identity_acquire_expire, 0 },
-        { "identity_upcall",            lprocfs_rd_identity_upcall,
-                                        lprocfs_wr_identity_upcall,         0 },
-        { "identity_flush",             0, lprocfs_wr_identity_flush,       0 },
-        { "identity_info",              0, lprocfs_wr_identity_info,        0 },
-        { "capa",                       lprocfs_rd_capa,
-                                        lprocfs_wr_capa,                    0 },
-        { "capa_timeout",               lprocfs_rd_capa_timeout,
-                                        lprocfs_wr_capa_timeout,            0 },
-        { "capa_key_timeout",           lprocfs_rd_ck_timeout,
-                                        lprocfs_wr_ck_timeout,              0 },
-        { "capa_count",                 lprocfs_rd_capa_count,           0, 0 },
-        { "site_stats",                 lprocfs_rd_site_stats,           0, 0 },
-        { "evict_client",               0, lprocfs_mdt_wr_evict_client,     0 },
-        { "hash_stats",                 lprocfs_obd_rd_hash,    0, 0 },
-        { "sec_level",                  lprocfs_rd_sec_level,
-                                        lprocfs_wr_sec_level,               0 },
-        { "commit_on_sharing",          lprocfs_rd_cos, lprocfs_wr_cos, 0 },
-        { "root_squash",                lprocfs_rd_root_squash,
-                                        lprocfs_wr_root_squash,             0 },
-        { "nosquash_nids",              lprocfs_rd_nosquash_nids,
-                                        lprocfs_wr_nosquash_nids,           0 },
-        { "som",                        lprocfs_rd_mdt_som,
-                                        lprocfs_wr_mdt_som, 0 },
-        { "mdccomm",                    0, lprocfs_mdt_wr_mdc,              0 },
-        { 0 }
-};
-
-static struct lprocfs_vars lprocfs_mdt_module_vars[] = {
-        { "num_refs",                   lprocfs_rd_numrefs,              0, 0 },
-        { 0 }
-};
+void mdt_stats_counter_init(struct lprocfs_stats *stats)
+{
+        lprocfs_counter_init(stats, LPROC_MDT_OPEN, 0, "open", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_CLOSE, 0, "close", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_MKNOD, 0, "mknod", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_LINK, 0, "link", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_UNLINK, 0, "unlink", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_MKDIR, 0, "mkdir", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_RMDIR, 0, "rmdir", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_RENAME, 0, "rename", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_GETATTR, 0, "getattr", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_SETATTR, 0, "setattr", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_GETXATTR, 0, "getxattr", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_SETXATTR, 0, "setxattr", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_STATFS, 0, "statfs", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_SYNC, 0, "sync", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_SAMEDIR_RENAME, 0,
+                             "samedir_rename", "reqs");
+        lprocfs_counter_init(stats, LPROC_MDT_CROSSDIR_RENAME, 0,
+                             "crossdir_rename", "reqs");
+}
 
-void lprocfs_mdt_init_vars(struct lprocfs_static_vars *lvars)
+int mdt_procfs_init(struct mdt_device *mdt, const char *name)
 {
-    lvars->module_vars  = lprocfs_mdt_module_vars;
-    lvars->obd_vars     = lprocfs_mdt_obd_vars;
+       struct obd_device               *obd = mdt2obd_dev(mdt);
+       int                              rc;
+       ENTRY;
+
+       LASSERT(name != NULL);
+
+       obd->obd_vars = lprocfs_mdt_obd_vars;
+       rc = lprocfs_obd_setup(obd);
+       if (rc) {
+               CERROR("%s: cannot create proc entries: rc = %d\n",
+                      mdt_obd_name(mdt), rc);
+               return rc;
+       }
+
+       rc = hsm_cdt_procfs_init(mdt);
+       if (rc) {
+               CERROR("%s: cannot create hsm proc entries: rc = %d\n",
+                      mdt_obd_name(mdt), rc);
+               return rc;
+       }
+
+       obd->obd_proc_exports_entry = proc_mkdir("exports",
+                                                obd->obd_proc_entry);
+       if (obd->obd_proc_exports_entry)
+               lprocfs_add_simple(obd->obd_proc_exports_entry, "clear",
+                                  obd, &mdt_nid_stats_clear_fops);
+       rc = lprocfs_alloc_md_stats(obd, LPROC_MDT_LAST);
+       if (rc)
+               return rc;
+       mdt_stats_counter_init(obd->obd_md_stats);
+
+       rc = lprocfs_job_stats_init(obd, LPROC_MDT_LAST,
+                                   mdt_stats_counter_init);
+
+       rc = lproc_mdt_attach_rename_seqstat(mdt);
+       if (rc)
+               CERROR("%s: MDT can not create rename stats rc = %d\n",
+                      mdt_obd_name(mdt), rc);
+
+       RETURN(rc);
+}
+
+void mdt_procfs_fini(struct mdt_device *mdt)
+{
+       struct obd_device *obd = mdt2obd_dev(mdt);
+
+       if (obd->obd_proc_exports_entry != NULL) {
+               lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
+               obd->obd_proc_exports_entry = NULL;
+       }
+
+       lprocfs_free_per_client_stats(obd);
+       hsm_cdt_procfs_fini(mdt);
+       lprocfs_obd_cleanup(obd);
+       lprocfs_free_md_stats(obd);
+       lprocfs_free_obd_stats(obd);
+       lprocfs_job_stats_fini(obd);
 }