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LU-11420 mdt: export mdt_dom_read_open_fops
[fs/lustre-release.git] / lustre / mdt / mdt_lproc.c
index 010caf4..b41eeee 100644 (file)
  *
  * You should have received a copy of the GNU General Public License
  * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
  *
  * GPL HEADER END
  */
@@ -27,7 +23,7 @@
  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2013, Intel Corporation.
+ * Copyright (c) 2011, 2017, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -45,9 +41,9 @@
 #include <asm/statfs.h>
 
 #include <linux/module.h>
-
+#include <uapi/linux/lnet/nidstr.h>
 /* LUSTRE_VERSION_CODE */
-#include <lustre_ver.h>
+#include <uapi/linux/lustre/lustre_ver.h>
 /*
  * struct OBD_{ALLOC,FREE}*()
  * MDT_FAIL_CHECK
@@ -61,7 +57,6 @@
 #include <lustre_mds.h>
 #include <lprocfs_status.h>
 #include "mdt_internal.h"
-#include <lnet/lib-lnet.h>
 
 /**
  * The rename stats output would be YAML formats, like
@@ -117,13 +112,13 @@ static void display_rename_stats(struct seq_file *seq, char *name,
 static void rename_stats_show(struct seq_file *seq,
                               struct rename_stats *rename_stats)
 {
-        struct timeval now;
+       struct timespec64 now;
 
-        /* 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);
+       /* this sampling races with updates */
+       ktime_get_real_ts64(&now);
+       seq_printf(seq, "rename_stats:\n");
+       seq_printf(seq, "- %-15s %llu.%9lu\n", "snapshot_time:",
+                  (s64)now.tv_sec, now.tv_nsec);
 
         display_rename_stats(seq, "same_dir",
                              &rename_stats->hist[RENAME_SAMEDIR_SIZE]);
@@ -144,8 +139,9 @@ static int mdt_rename_stats_seq_show(struct seq_file *seq, void *v)
         return 0;
 }
 
-static ssize_t mdt_rename_stats_seq_write(struct file *file, const char *buf,
-                                          size_t len, loff_t *off)
+static ssize_t
+mdt_rename_stats_seq_write(struct file *file, const char __user *buf,
+                          size_t len, loff_t *off)
 {
         struct seq_file *seq = file->private_data;
         struct mdt_device *mdt = seq->private;
@@ -156,7 +152,6 @@ static ssize_t mdt_rename_stats_seq_write(struct file *file, const char *buf,
 
         return len;
 }
-
 LPROC_SEQ_FOPS(mdt_rename_stats);
 
 static int lproc_mdt_attach_rename_seqstat(struct mdt_device *mdt)
@@ -213,143 +208,89 @@ void mdt_rename_counter_tally(struct mdt_thread_info *info,
                               (unsigned int)ma->ma_attr.la_size);
 }
 
-int mdt_procfs_init(struct mdt_device *mdt, const char *name)
+static int mdt_identity_expire_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device               *obd = mdt2obd_dev(mdt);
-       struct lprocfs_static_vars       lvars;
-       int                              rc;
-       ENTRY;
-
-       LASSERT(name != NULL);
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-       lprocfs_mdt_init_vars(&lvars);
-       rc = lprocfs_obd_setup(obd, lvars.obd_vars);
-       if (rc) {
-               CERROR("%s: cannot create proc entries: rc = %d\n",
-                      mdt_obd_name(mdt), rc);
-               return rc;
-       }
+       seq_printf(m, "%lld\n", mdt->mdt_identity_cache->uc_entry_expire);
+       return 0;
+}
 
-       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;
-       }
+static ssize_t
+mdt_identity_expire_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);
+       time64_t val;
+       int 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", lprocfs_nid_stats_clear_read,
-                                  lprocfs_nid_stats_clear_write, obd, NULL);
-       rc = lprocfs_alloc_md_stats(obd, LPROC_MDT_LAST);
+       rc = kstrtoll_from_user(buffer, count, 0, &val);
        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 (val < 0)
+               return -ERANGE;
 
-       if (obd->obd_proc_exports_entry != NULL) {
-               lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
-               obd->obd_proc_exports_entry = NULL;
-       }
+       mdt->mdt_identity_cache->uc_entry_expire = val;
 
-       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);
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_identity_expire);
 
-static int lprocfs_rd_identity_expire(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 obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        *eof = 1;
-        return snprintf(page, count, "%u\n",
-                        mdt->mdt_identity_cache->uc_entry_expire);
+       seq_printf(m, "%lld\n", mdt->mdt_identity_cache->uc_acquire_expire);
+       return 0;
 }
 
-static int lprocfs_wr_identity_expire(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);
-        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);
+       time64_t val;
+       int rc;
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       rc = kstrtoll_from_user(buffer, count, 0, &val);
+       if (rc)
+               return rc;
 
-        mdt->mdt_identity_cache->uc_entry_expire = val;
-        return count;
-}
+       if (val < 0 || val > INT_MAX)
+               return -ERANGE;
 
-static int lprocfs_rd_identity_acquire_expire(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);
+       mdt->mdt_identity_cache->uc_acquire_expire = val;
 
-        *eof = 1;
-        return snprintf(page, count, "%u\n",
-                        mdt->mdt_identity_cache->uc_acquire_expire);
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_identity_acquire_expire);
 
-static int lprocfs_wr_identity_acquire_expire(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, val;
-
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
-
-        mdt->mdt_identity_cache->uc_acquire_expire = val;
-        return count;
-}
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct upcall_cache *hash = mdt->mdt_identity_cache;
 
-static int lprocfs_rd_identity_upcall(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);
-        struct upcall_cache *hash = mdt->mdt_identity_cache;
-        int len;
-
-       *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;
+       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_upcall(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 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;
@@ -366,9 +307,9 @@ static int lprocfs_wr_identity_upcall(struct file *file, const char *buffer,
                GOTO(failed, rc = -EFAULT);
 
        /* Remove any extraneous bits from the upcall (e.g. linefeeds) */
-       write_lock(&hash->uc_upcall_rwlock);
+       down_write(&hash->uc_upcall_rwsem);
        sscanf(kernbuf, "%s", hash->uc_upcall);
-       write_unlock(&hash->uc_upcall_rwlock);
+       up_write(&hash->uc_upcall_rwsem);
 
        if (strcmp(hash->uc_name, mdt_obd_name(mdt)) != 0)
                CWARN("%s: write to upcall name %s\n",
@@ -388,26 +329,33 @@ static int lprocfs_wr_identity_upcall(struct file *file, const char *buffer,
                OBD_FREE(kernbuf, count + 1);
        RETURN(rc);
 }
+LPROC_SEQ_FOPS(mdt_identity_upcall);
 
-static int lprocfs_wr_identity_flush(struct file *file, const char *buffer,
-                                     unsigned long count, void *data)
+static ssize_t
+lprocfs_identity_flush_seq_write(struct file *file, const char __user *buffer,
+                                size_t count, void *data)
 {
-        struct obd_device *obd = data;
-        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-        int rc, uid;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       int uid;
+       int rc;
 
-        rc = lprocfs_write_helper(buffer, count, &uid);
-        if (rc)
-                return rc;
+       rc = kstrtoint_from_user(buffer, count, 0, &uid);
+       if (rc)
+               return rc;
 
-        mdt_flush_identity(mdt->mdt_identity_cache, uid);
-        return count;
+       mdt_flush_identity(mdt->mdt_identity_cache, uid);
+       return count;
 }
+LPROC_SEQ_FOPS_WR_ONLY(mdt, identity_flush);
 
-static int lprocfs_wr_identity_info(struct file *file, const char *buffer,
-                                   unsigned long count, void *data)
+static ssize_t
+lprocfs_identity_info_seq_write(struct file *file, const char __user *buffer,
+                               size_t count, void *data)
 {
-       struct obd_device *obd = 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;
@@ -415,7 +363,7 @@ static int lprocfs_wr_identity_info(struct file *file, const char *buffer,
 again:
        if (count < size) {
                CERROR("%s: invalid data count = %lu, size = %d\n",
-                      mdt_obd_name(mdt), count, size);
+                      mdt_obd_name(mdt), (unsigned long) count, size);
                return -EINVAL;
        }
 
@@ -468,593 +416,653 @@ out:
 
        return rc ? rc : count;
 }
+LPROC_SEQ_FOPS_WR_ONLY(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 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_lut.lut_oss_capa ? "oss" : "",
-                       mdt->mdt_lut.lut_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 seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-       int val, rc;
+       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));
 
-       /* 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;
+       if (strncmp(tmpbuf, "nid:", 4) != 0) {
+               count = lprocfs_evict_client_seq_write(file, buf, count, off);
+               goto out;
        }
 
-       mdt->mdt_lut.lut_oss_capa = !!(val & 0x1);
-       mdt->mdt_lut.lut_mds_capa = !!(val & 0x2);
-       mdt->mdt_capa_conf = 1;
-       LCONSOLE_INFO("MDS %s %s MDS fid capability.\n",
-                     mdt_obd_name(mdt),
-                     mdt->mdt_lut.lut_mds_capa ? "enabled" : "disabled");
-       LCONSOLE_INFO("MDS %s %s OSS fid capability.\n",
-                     mdt_obd_name(mdt),
-                     mdt->mdt_lut.lut_oss_capa ? "enabled" : "disabled");
-       return count;
-}
+       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);
+       }
 
-static int lprocfs_rd_capa_count(char *page, char **start, off_t off,
-                                 int count, int *eof, void *data)
-{
-        return snprintf(page, count, "%d %d\n",
-                        capa_count[CAPA_SITE_CLIENT],
-                        capa_count[CAPA_SITE_SERVER]);
-}
+       /* 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);
 
-static int lprocfs_rd_site_stats(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 lu_site_stats_print(mdt_lu_site(mdt), page, count);
+out:
+       OBD_FREE(kbuf, BUFLEN);
+       return rc < 0 ? rc : count;
 }
 
-static int lprocfs_rd_capa_timeout(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)
 {
-        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->mdt_opts.mo_evict_tgt_nids);
+       return 0;
 }
 
-static int lprocfs_wr_capa_timeout(struct file *file, const char *buffer,
-                                   unsigned long count, 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);
-        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);
+       bool val;
+       int rc;
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       rc = kstrtobool_from_user(buffer, count, &val);
+       if (rc)
+               return rc;
 
-        mdt->mdt_capa_timeout = (unsigned long)val;
-        mdt->mdt_capa_conf = 1;
-        return count;
+       mdt->mdt_opts.mo_evict_tgt_nids = val;
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_evict_tgt_nids);
 
-static int lprocfs_rd_ck_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_ck_timeout);
+       seq_printf(m, "%u\n", mdt_cos_is_enabled(mdt));
+       return 0;
 }
 
-static int lprocfs_wr_ck_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);
+       bool val;
+       int rc;
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       rc = kstrtobool_from_user(buffer, count, &val);
+       if (rc)
+               return rc;
 
-        mdt->mdt_ck_timeout = (unsigned long)val;
-        mdt->mdt_capa_conf = 1;
-        return count;
+       mdt_enable_cos(mdt, val);
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_cos);
 
-#define BUFLEN (UUID_MAX + 4)
-
-static int lprocfs_mdt_wr_evict_client(struct file *file, const char *buffer,
-                                       unsigned long count, void *data)
+static int mdt_root_squash_seq_show(struct seq_file *m, void *data)
 {
-        char *kbuf;
-        char *tmpbuf;
-
-        OBD_ALLOC(kbuf, BUFLEN);
-        if (kbuf == NULL)
-                return -ENOMEM;
-
-        /*
-         * 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, buffer,
-                          min_t(unsigned long, BUFLEN - 1, count))) {
-                count = -EFAULT;
-                goto out;
-        }
-        tmpbuf = cfs_firststr(kbuf, min_t(unsigned long, BUFLEN - 1, count));
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct root_squash_info *squash = &mdt->mdt_squash;
 
-        if (strncmp(tmpbuf, "nid:", 4) != 0) {
-                count = lprocfs_wr_evict_client(file, buffer, count, data);
-                goto out;
-        }
+       seq_printf(m, "%u:%u\n", squash->rsi_uid,
+                  squash->rsi_gid);
+       return 0;
+}
 
-        CERROR("NOT implement evict client by nid %s\n", tmpbuf);
+static ssize_t
+mdt_root_squash_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;
 
-out:
-        OBD_FREE(kbuf, BUFLEN);
-        return count;
+       return lprocfs_wr_root_squash(buffer, count, squash,
+                                     mdt_obd_name(mdt));
 }
+LPROC_SEQ_FOPS(mdt_root_squash);
 
-#undef BUFLEN
+static int mdt_nosquash_nids_seq_show(struct seq_file *m, void *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;
+       int len = 0;
+
+       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);
+
+       return 0;
+}
 
-static int lprocfs_rd_sec_level(char *page, char **start, off_t off,
-                                int count, int *eof, void *data)
+static ssize_t
+mdt_nosquash_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);
+       struct root_squash_info *squash = &mdt->mdt_squash;
 
-       return snprintf(page, count, "%d\n", mdt->mdt_lut.lut_sec_level);
+       return lprocfs_wr_nosquash_nids(buffer, count, squash,
+                                       mdt_obd_name(mdt));
 }
+LPROC_SEQ_FOPS(mdt_nosquash_nids);
 
-static int lprocfs_wr_sec_level(struct file *file, const char *buffer,
-                                unsigned long count, 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);
-        int val, rc;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
+       seq_printf(m, "%u\n", mdt->mdt_enable_remote_dir);
+       return 0;
+}
 
-        if (val > LUSTRE_SEC_ALL || val < LUSTRE_SEC_NONE)
-                return -EINVAL;
+static ssize_t
+mdt_enable_remote_dir_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);
+       bool val;
+       int rc;
 
-        if (val == LUSTRE_SEC_SPECIFY) {
-                CWARN("security level %d will be supported in future.\n",
-                      LUSTRE_SEC_SPECIFY);
-                return -EINVAL;
-        }
+       rc = kstrtobool_from_user(buffer, count, &val);
+       if (rc)
+               return rc;
 
-       mdt->mdt_lut.lut_sec_level = val;
+       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;
-
-        rc = lprocfs_write_helper(buffer, count, &val);
-        if (rc)
-                return rc;
-        mdt_enable_cos(mdt, val);
-        return count;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       int val;
+       int rc;
+
+       rc = kstrtoint_from_user(buffer, count, 0, &val);
+       if (rc)
+               return rc;
+
+       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);
+       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];
-
-        *res = simple_strtoul(str, endp, 0);
-        if (str == *endp)
-                return 1;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-        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 seq_file *m = file->private_data;
+       struct obd_device *obd = m->private;
        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       int val;
        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;
-       }
-
-       /* 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;
-
-       if (nouid && nogid) {
-               errmsg = "needs uid:gid format";
-               GOTO(failed, rc = -EINVAL);
-       }
+       rc = kstrtoint_from_user(buffer, count, 0, &val);
+       if (rc)
+               return rc;
 
-       LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
-                     mdt_obd_name(mdt),
-                     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",
-             mdt_obd_name(mdt), 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);
+       struct seq_file *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct lu_target *tgt = obd->u.obt.obt_lut;
+       int val;
        int rc;
-       char *kernbuf, *errmsg;
-       cfs_list_t 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 (!cfs_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",
-                             mdt_obd_name(mdt));
-               OBD_FREE(kernbuf, count + 1);
-               RETURN(count);
-       }
+       rc = kstrtoint_from_user(buffer, count, 0, &val);
+       if (rc)
+               return rc;
 
-       CFS_INIT_LIST_HEAD(&tmp);
-       if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
-               errmsg = "can't parse";
-               GOTO(failed, rc = -EINVAL);
-       }
+       atomic_set(&tgt->lut_sync_count, val);
 
-       down_write(&mdt->mdt_squash_sem);
-       if (!cfs_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;
-       cfs_list_splice(&tmp, &mdt->mdt_nosquash_nids);
+       return count;
+}
+LPROC_SEQ_FOPS(mdt_sync_count);
 
-       LCONSOLE_INFO("%s: nosquash_nids is set to %s\n",
-                     mdt_obd_name(mdt), kernbuf);
-       up_write(&mdt->mdt_squash_sem);
-       RETURN(count);
+static char *dom_open_lock_modes[NUM_DOM_LOCK_ON_OPEN_MODES] = {
+       [NO_DOM_LOCK_ON_OPEN] = "never",
+       [TRYLOCK_DOM_ON_OPEN] = "trylock",
+       [ALWAYS_DOM_LOCK_ON_OPEN] = "always",
+};
 
-failed:
-       CWARN("%s: failed to set nosquash_nids to \"%s\", %s: rc %d\n",
-             mdt_obd_name(mdt), kernbuf, errmsg, rc);
-       if (kernbuf)
-               OBD_FREE(kernbuf, count + 1);
-       RETURN(rc);
-}
+/* This must be longer than the longest string above */
+#define DOM_LOCK_MODES_MAXLEN 16
 
-static int lprocfs_rd_mdt_som(char *page, char **start, off_t off,
-                              int count, int *eof, void *data)
+/**
+ * Show MDT policy for data prefetch on open for DoM files..
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused
+ *
+ * \retval             0 on success
+ * \retval             negative value on error
+ */
+static int mdt_dom_lock_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, "%sabled\n",
-                        mdt->mdt_som_conf ? "en" : "dis");
+       seq_printf(m, "%s\n", dom_open_lock_modes[mdt->mdt_opts.mo_dom_lock]);
+       return 0;
 }
 
-static int lprocfs_wr_mdt_som(struct file *file, const char *buffer,
-                              unsigned long count, void *data)
+/**
+ * Change MDT policy for data prefetch on open for DoM files.
+ *
+ * This variable defines how DOM lock is taken at open enqueue.
+ * There are three possible modes:
+ * 1) never - never take DoM lock on open. DoM lock will be taken as separate
+ *    IO lock with own enqueue.
+ * 2) trylock - DoM lock will be taken only if non-blocked.
+ * 3) always - DoM lock will be taken always even if it is blocking lock.
+ *
+ * If dom_read_open is enabled too then DoM lock is taken in PR mode and
+ * is paired with LAYOUT lock when possible.
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents policy
+ * \param[in] count    \a buffer length
+ * \param[in] off      unused for single entry
+ *
+ * \retval             \a count on success
+ * \retval             negative number on error
+ */
+static ssize_t
+mdt_dom_lock_seq_write(struct file *file, const char __user *buffer,
+                      size_t count, loff_t *off)
 {
-        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;
+       struct seq_file *m = file->private_data;
+       struct obd_device *obd = m->private;
+       struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       char kernbuf[DOM_LOCK_MODES_MAXLEN];
+       int val = -1;
+       int i, rc;
 
-        if (count > (sizeof(kernbuf) - 1))
-                return -EINVAL;
+       if (count == 0 || count >= sizeof(kernbuf))
+               return -EINVAL;
 
        if (copy_from_user(kernbuf, buffer, count))
-                return -EFAULT;
-
-        kernbuf[count] = '\0';
+               return -EFAULT;
 
-        if (!strcmp(kernbuf, "enabled"))
-                val = 1;
-        else if (strcmp(kernbuf, "disabled"))
-                return -EINVAL;
+       kernbuf[count] = 0;
+       if (kernbuf[count - 1] == '\n')
+               kernbuf[count - 1] = 0;
 
-        if (mdt->mdt_som_conf == val)
-                return count;
-
-        if (!obd->obd_process_conf) {
-                CERROR("Temporary SOM change is not supported, use lctl "
-                       "conf_param for permanent setting\n");
-                return count;
-        }
+       for (i = 0 ; i < NUM_DOM_LOCK_ON_OPEN_MODES; i++) {
+               if (strcmp(kernbuf, dom_open_lock_modes[i]) == 0) {
+                       val = i;
+                       break;
+               }
+       }
 
-        /* 1 stands for self export. */
-        cfs_list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
-                if (exp == obd->obd_self_export)
-                        continue;
-               if (exp_connect_flags(exp) & 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;
-        }
+       /* Legacy numeric codes */
+       if (val == -1) {
+               rc = kstrtoint_from_user(buffer, count, 0, &val);
+               if (rc)
+                       return rc;
+       }
 
-        mdt->mdt_som_conf = val;
-        LCONSOLE_INFO("Enabling SOM\n");
+       if (val < 0 || val >= NUM_DOM_LOCK_ON_OPEN_MODES)
+               return -EINVAL;
 
-        return count;
+       mdt->mdt_opts.mo_dom_lock = val;
+       return count;
 }
+LPROC_SEQ_FOPS(mdt_dom_lock);
 
-static int lprocfs_rd_enable_remote_dir(char *page, char **start, off_t off,
-                                       int count, int *eof, void *data)
+/**
+ * Show MDT policy for data prefetch on open for DoM files..
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused
+ *
+ * \retval             0 on success
+ * \retval             negative value on error
+ */
+static int mdt_dom_read_open_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-       return snprintf(page, count, "%u\n", mdt->mdt_enable_remote_dir);
+       seq_printf(m, "%u\n", !!mdt->mdt_opts.mo_dom_read_open);
+       return 0;
 }
 
-static int lprocfs_wr_enable_remote_dir(struct file *file, const char *buffer,
-                                       unsigned long count, void *data)
+/**
+ * Modify MDT policy for data prefetch on open for DoM files.
+ *
+ * If enabled then Data-on-MDT file data may be read during open and
+ * returned back in reply. It works only with mo_dom_lock enabled.
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents policy
+ * \param[in] count    \a buffer length
+ * \param[in] off      unused for single entry
+ *
+ * \retval             \a count on success
+ * \retval             negative number on error
+ */
+static ssize_t
+mdt_dom_read_open_seq_write(struct file *file, const char __user *buffer,
+                           size_t count, loff_t *off)
 {
-       struct obd_device *obd = data;
+       struct seq_file *m = file->private_data;
+       struct obd_device *obd = m->private;
        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-       __u32 val;
+       bool val;
        int rc;
 
-       rc = lprocfs_write_helper(buffer, count, &val);
+       rc = kstrtobool_from_user(buffer, count, &val);
        if (rc)
                return rc;
 
-       if (val > 1)
-               return -ERANGE;
-
-       mdt->mdt_enable_remote_dir = val;
+       mdt->mdt_opts.mo_dom_read_open = !!val;
        return count;
 }
+LPROC_SEQ_FOPS(mdt_dom_read_open);
 
-static int lprocfs_rd_enable_remote_dir_gid(char *page, char **start, off_t off,
-                                           int count, int *eof, void *data)
+static int mdt_migrate_hsm_allowed_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
 
-       return snprintf(page, count, "%d\n",
-                       (int)mdt->mdt_enable_remote_dir_gid);
+       seq_printf(m, "%u\n",  (mdt->mdt_opts.mo_migrate_hsm_allowed != 0));
+       return 0;
 }
 
-static int lprocfs_wr_enable_remote_dir_gid(struct file *file,
-                                           const char *buffer,
-                                           unsigned long count, void *data)
+static ssize_t
+mdt_migrate_hsm_allowed_seq_write(struct file *file, const char __user *buffer,
+                                 size_t count, loff_t *off)
 {
-       struct obd_device *obd = data;
+       struct seq_file *m = file->private_data;
+       struct obd_device *obd = m->private;
        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
-       __u32 val;
+       bool val;
        int rc;
 
-       rc = lprocfs_write_helper(buffer, count, &val);
+       rc = kstrtobool_from_user(buffer, count, &val);
        if (rc)
                return rc;
 
-       mdt->mdt_enable_remote_dir_gid = val;
+       mdt->mdt_opts.mo_migrate_hsm_allowed = val;
        return count;
 }
+LPROC_SEQ_FOPS(mdt_migrate_hsm_allowed);
+
+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_WR_ONLY(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);
+
+LPROC_SEQ_FOPS_RW_TYPE(mdt, recovery_time_hard);
+LPROC_SEQ_FOPS_RW_TYPE(mdt, recovery_time_soft);
+
+LPROC_SEQ_FOPS_RO(tgt_tot_dirty);
+LPROC_SEQ_FOPS_RO(tgt_tot_granted);
+LPROC_SEQ_FOPS_RO(tgt_tot_pending);
+LPROC_SEQ_FOPS(tgt_grant_compat_disable);
 
 static struct lprocfs_vars lprocfs_mdt_obd_vars[] = {
-       { "uuid",                       lprocfs_rd_uuid, NULL,
-                                       NULL, NULL, 0 },
-       { "recovery_status",            lprocfs_obd_rd_recovery_status, NULL,
-                                       NULL, NULL, 0 },
-       { "num_exports",                lprocfs_rd_num_exports, NULL,
-                                       NULL, NULL, 0 },
-       { "identity_expire",            lprocfs_rd_identity_expire,
-                                       lprocfs_wr_identity_expire,
-                                       NULL, NULL, 0 },
-       { "identity_acquire_expire",    lprocfs_rd_identity_acquire_expire,
-                                       lprocfs_wr_identity_acquire_expire,
-                                       NULL, NULL, 0 },
-       { "identity_upcall",            lprocfs_rd_identity_upcall,
-                                       lprocfs_wr_identity_upcall,
-                                       NULL, NULL, 0 },
-       { "identity_flush",             NULL, lprocfs_wr_identity_flush,
-                                       NULL, NULL, 0 },
-       { "identity_info",              NULL, lprocfs_wr_identity_info,
-                                       NULL, NULL, 0 },
-       { "capa",                       lprocfs_rd_capa,
-                                       lprocfs_wr_capa,
-                                       NULL, NULL, 0 },
-       { "capa_timeout",               lprocfs_rd_capa_timeout,
-                                       lprocfs_wr_capa_timeout,
-                                       NULL, NULL, 0 },
-       { "capa_key_timeout",           lprocfs_rd_ck_timeout,
-                                       lprocfs_wr_ck_timeout,
-                                       NULL, NULL, 0 },
-       { "capa_count",                 lprocfs_rd_capa_count, NULL,
-                                       NULL, NULL, 0 },
-       { "site_stats",                 lprocfs_rd_site_stats, NULL,
-                                       NULL, NULL, 0 },
-       { "evict_client",               NULL, lprocfs_mdt_wr_evict_client,
-                                       NULL, NULL, 0 },
-       { "hash_stats",                 lprocfs_obd_rd_hash, NULL,
-                                       NULL, NULL, 0 },
-       { "sec_level",                  lprocfs_rd_sec_level,
-                                       lprocfs_wr_sec_level,
-                                       NULL, NULL, 0 },
-       { "commit_on_sharing",          lprocfs_rd_cos, lprocfs_wr_cos,
-                                       NULL, NULL, 0 },
-       { "root_squash",                lprocfs_rd_root_squash,
-                                       lprocfs_wr_root_squash,
-                                       NULL, NULL, 0 },
-       { "nosquash_nids",              lprocfs_rd_nosquash_nids,
-                                       lprocfs_wr_nosquash_nids,
-                                       NULL, NULL, 0 },
-       { "som",                        lprocfs_rd_mdt_som,
-                                       lprocfs_wr_mdt_som,
-                                       NULL, NULL, 0 },
-       { "instance",                   lprocfs_target_rd_instance, NULL,
-                                       NULL, NULL, 0},
-       { "ir_factor",                  lprocfs_obd_rd_ir_factor,
-                                       lprocfs_obd_wr_ir_factor,
-                                       NULL, NULL, 0 },
-       { "job_cleanup_interval",       lprocfs_rd_job_interval,
-                                       lprocfs_wr_job_interval,
-                                       NULL, NULL, 0 },
-       { "enable_remote_dir",          lprocfs_rd_enable_remote_dir,
-                                       lprocfs_wr_enable_remote_dir,
-                                       NULL, NULL, 0},
-       { "enable_remote_dir_gid",      lprocfs_rd_enable_remote_dir_gid,
-                                       lprocfs_wr_enable_remote_dir_gid,
-                                       NULL, NULL, 0},
-       { "hsm_control",                lprocfs_rd_hsm_cdt_control,
-                                       lprocfs_wr_hsm_cdt_control,
-                                       NULL, NULL, 0 },
-       { 0 }
+       { .name =       "tot_dirty",
+         .fops =       &tgt_tot_dirty_fops             },
+       { .name =       "tot_pending",
+         .fops =       &tgt_tot_pending_fops           },
+       { .name =       "tot_granted",
+         .fops =       &tgt_tot_granted_fops           },
+       { .name =       "grant_compat_disable",
+         .fops =       &tgt_grant_compat_disable_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                    },
+       { .name =       "dom_lock",
+         .fops =       &mdt_dom_lock_fops                      },
+       { .name =       "dom_read_open",
+         .fops =       &mdt_dom_read_open_fops                 },
+       { .name =       "migrate_hsm_allowed",
+         .fops =       &mdt_migrate_hsm_allowed_fops           },
+       { NULL }
 };
 
-static struct lprocfs_vars lprocfs_mdt_module_vars[] = {
-       { "num_refs",                   lprocfs_rd_numrefs, NULL,
-                                       NULL, NULL, 0 },
-        { 0 }
-};
+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 = cfs_hash_object(hs, hnode);
+       struct seq_file         *seq = v;
+
+       if (exp->exp_lock_hash != NULL) {
+               struct mdt_export_data  *med = &exp->exp_mdt_data;
+               struct mdt_file_data    *mfd;
+
+               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);
+       }
+
+       return 0;
+}
 
-void lprocfs_mdt_init_vars(struct lprocfs_static_vars *lvars)
+static int lprocfs_mdt_open_files_seq_show(struct seq_file *seq, void *v)
 {
-       lvars->module_vars  = lprocfs_mdt_module_vars;
-       lvars->obd_vars     = lprocfs_mdt_obd_vars;
+       struct nid_stat *stats = seq->private;
+       struct obd_device *obd = stats->nid_obd;
+
+       cfs_hash_for_each_key(obd->obd_nid_hash, &stats->nid,
+                             lprocfs_mdt_print_open_files, seq);
+
+       return 0;
 }
 
-struct lprocfs_vars lprocfs_mds_obd_vars[] = {
-       { "uuid",       lprocfs_rd_uuid, NULL, NULL, NULL, 0 },
-       { 0 }
-};
+int lprocfs_mdt_open_files_seq_open(struct inode *inode, struct file *file)
+{
+       struct seq_file         *seq;
+       int                     rc;
 
-struct lprocfs_vars lprocfs_mds_module_vars[] = {
-       { "num_refs",   lprocfs_rd_numrefs, NULL, NULL, NULL, 0 },
-       { 0 }
-};
+       rc = single_open(file, &lprocfs_mdt_open_files_seq_show, NULL);
+       if (rc != 0)
+               return rc;
+
+       seq = file->private_data;
+       seq->private = PDE_DATA(inode);
+
+       return 0;
+}
 
 void mdt_counter_incr(struct ptlrpc_request *req, int opcode)
 {
        struct obd_export *exp = req->rq_export;
 
        if (exp->exp_obd && exp->exp_obd->obd_md_stats)
-               lprocfs_counter_incr(exp->exp_obd->obd_md_stats, opcode);
+               lprocfs_counter_incr(exp->exp_obd->obd_md_stats,
+                                    opcode + LPROC_MD_LAST_OPC);
        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 &&
@@ -1064,24 +1072,114 @@ void mdt_counter_incr(struct ptlrpc_request *req, int opcode)
                                      opcode, 1);
 }
 
+static const char * const mdt_stats[] = {
+       [LPROC_MDT_OPEN]                = "open",
+       [LPROC_MDT_CLOSE]               = "close",
+       [LPROC_MDT_MKNOD]               = "mknod",
+       [LPROC_MDT_LINK]                = "link",
+       [LPROC_MDT_UNLINK]              = "unlink",
+       [LPROC_MDT_MKDIR]               = "mkdir",
+       [LPROC_MDT_RMDIR]               = "rmdir",
+       [LPROC_MDT_RENAME]              = "rename",
+       [LPROC_MDT_GETATTR]             = "getattr",
+       [LPROC_MDT_SETATTR]             = "setattr",
+       [LPROC_MDT_GETXATTR]            = "getxattr",
+       [LPROC_MDT_SETXATTR]            = "setxattr",
+       [LPROC_MDT_STATFS]              = "statfs",
+       [LPROC_MDT_SYNC]                = "sync",
+       [LPROC_MDT_SAMEDIR_RENAME]      = "samedir_rename",
+       [LPROC_MDT_CROSSDIR_RENAME]     = "crossdir_rename",
+       [LPROC_MDT_IO_READ]             = "read_bytes",
+       [LPROC_MDT_IO_WRITE]            = "write_bytes",
+       [LPROC_MDT_IO_PUNCH]            = "punch",
+};
+
 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");
+       int idx;
+
+       LASSERT(stats && stats->ls_num >= ARRAY_SIZE(mdt_stats));
+
+       for (idx = 0; idx < ARRAY_SIZE(mdt_stats); idx++) {
+               int flags = 0;
+
+               if (idx == LPROC_MDT_IO_WRITE || idx == LPROC_MDT_IO_READ)
+                       flags = LPROCFS_CNTR_AVGMINMAX;
+
+               lprocfs_counter_init(stats, idx, flags, mdt_stats[idx], "reqs");
+       }
+}
+
+int mdt_procfs_init(struct mdt_device *mdt, const char *name)
+{
+       struct obd_device *obd = mdt2obd_dev(mdt);
+       int rc;
+       int i;
+
+       ENTRY;
+       LASSERT(name != NULL);
+
+       obd->obd_vars = lprocfs_mdt_obd_vars;
+       rc = lprocfs_obd_setup(obd, true);
+       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, ARRAY_SIZE(mdt_stats));
+       if (rc)
+               return rc;
+
+       /* add additional MDT md_stats after the default ones */
+       for (i = 0; i < ARRAY_SIZE(mdt_stats); i++) {
+               int idx = i + LPROC_MD_LAST_OPC;
+               int flags = 0;
+
+               if (idx == LPROC_MDT_IO_WRITE || idx == LPROC_MDT_IO_READ)
+                       flags = LPROCFS_CNTR_AVGMINMAX;
+
+               lprocfs_counter_init(obd->obd_md_stats, idx, flags,
+                                    mdt_stats[i], "reqs");
+       }
+
+       rc = lprocfs_job_stats_init(obd, ARRAY_SIZE(mdt_stats),
+                                   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);
 }