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LU-4975 doxygen: add comments for lproc_osp.c
[fs/lustre-release.git] / lustre / osp / lproc_osp.c
index 75ebeb1..68adc7a 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) 2012, 2013, Intel Corporation.
+ * Copyright (c) 2012, 2013, 2014 Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -35,7 +31,7 @@
  *
  * lustre/osp/lproc_osp.c
  *
- * Lustre OST Proxy Device, procfs functions
+ * Lustre OST Proxy Device (OSP), procfs functions
  *
  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  */
 #include "osp_internal.h"
 
 #ifdef LPROCFS
-static int osp_rd_active(char *page, char **start, off_t off,
-                        int count, int *eof, void *data)
+/**
+ * Show OSP active status
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_active_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device       *dev = data;
+       struct obd_device       *dev = m->private;
        int                      rc;
 
        LPROCFS_CLIMP_CHECK(dev);
-       rc = snprintf(page, count, "%d\n",
-                     !dev->u.cli.cl_import->imp_deactive);
+       rc = seq_printf(m, "%d\n", !dev->u.cli.cl_import->imp_deactive);
        LPROCFS_CLIMP_EXIT(dev);
        return rc;
 }
 
-static int osp_wr_active(struct file *file, const char *buffer,
-                        unsigned long count, void *data)
+/**
+ * Activate/Deactivate OSP
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string, which is "1" or "0" to activate/deactivate OSP
+ * \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
+osp_active_seq_write(struct file *file, const char *buffer,
+                       size_t count, loff_t *off)
 {
-       struct obd_device       *dev = data;
-       int                      val, rc;
+       struct seq_file   *m = file->private_data;
+       struct obd_device *dev = m->private;
+       int                val, rc;
 
        rc = lprocfs_write_helper(buffer, count, &val);
        if (rc)
@@ -81,67 +95,132 @@ static int osp_wr_active(struct file *file, const char *buffer,
        LPROCFS_CLIMP_EXIT(dev);
        return count;
 }
+LPROC_SEQ_FOPS(osp_active);
 
-static int osp_rd_syn_in_flight(char *page, char **start, off_t off,
-                               int count, int *eof, void *data)
+/**
+ * Show number of RPCs in flight
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_syn_in_flight_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device       *dev = data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
-       int                      rc;
 
        if (osp == NULL)
                return -EINVAL;
 
-       rc = snprintf(page, count, "%u\n", osp->opd_syn_rpc_in_flight);
-       return rc;
+       return seq_printf(m, "%u\n", osp->opd_syn_rpc_in_flight);
 }
+LPROC_SEQ_FOPS_RO(osp_syn_in_flight);
 
-static int osp_rd_syn_in_prog(char *page, char **start, off_t off, int count,
-                             int *eof, void *data)
+/**
+ * Show number of RPCs in processing (including uncommitted by OST)
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_syn_in_prog_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device       *dev = data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
-       int                      rc;
 
        if (osp == NULL)
                return -EINVAL;
 
-       rc = snprintf(page, count, "%u\n", osp->opd_syn_rpc_in_progress);
-       return rc;
+       return seq_printf(m, "%u\n", osp->opd_syn_rpc_in_progress);
 }
+LPROC_SEQ_FOPS_RO(osp_syn_in_prog);
 
-static int osp_rd_syn_changes(char *page, char **start, off_t off,
-                             int count, int *eof, void *data)
+/**
+ * Show number of changes to sync
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_syn_changes_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device       *dev = data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
-       int                      rc;
 
        if (osp == NULL)
                return -EINVAL;
 
-       rc = snprintf(page, count, "%lu\n", osp->opd_syn_changes);
-       return rc;
+       return seq_printf(m, "%lu\n", osp->opd_syn_changes);
 }
 
-static int osp_rd_max_rpcs_in_flight(char *page, char **start, off_t off,
-                                    int count, int *eof, void *data)
+/**
+ * Sync changes
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   unused because any input will do
+ * \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 osp_syn_changes_seq_write(struct file *file, const char *buffer,
+                                        size_t count, loff_t *off)
 {
-       struct obd_device       *dev = data;
-       struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
+       struct seq_file         *m      = file->private_data;
+       struct obd_device       *dev    = m->private;
+       struct osp_device       *osp    = lu2osp_dev(dev->obd_lu_dev);
+       struct lu_env            env;
        int                      rc;
 
+       rc = lu_env_init(&env, LCT_LOCAL);
+       if (rc != 0)
+               return rc;
+
+       rc = dt_sync(&env, &osp->opd_dt_dev);
+       lu_env_fini(&env);
+
+       return rc == 0 ? count : rc;
+}
+LPROC_SEQ_FOPS(osp_syn_changes);
+
+/**
+ * Show maximum number of RPCs in flight allowed
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_max_rpcs_in_flight_seq_show(struct seq_file *m, void *data)
+{
+       struct obd_device       *dev = m->private;
+       struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
+
        if (osp == NULL)
                return -EINVAL;
 
-       rc = snprintf(page, count, "%u\n", osp->opd_syn_max_rpc_in_flight);
-       return rc;
+       return seq_printf(m, "%u\n", osp->opd_syn_max_rpc_in_flight);
 }
 
-static int osp_wr_max_rpcs_in_flight(struct file *file, const char *buffer,
-                                    unsigned long count, void *data)
+/**
+ * Change maximum number of RPCs in flight allowed
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents maximum number
+ * \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
+osp_max_rpcs_in_flight_seq_write(struct file *file, const char *buffer,
+                               size_t count, loff_t *off)
 {
-       struct obd_device       *dev = data;
+       struct seq_file         *m = file->private_data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
        int                      val, rc;
 
@@ -158,25 +237,43 @@ static int osp_wr_max_rpcs_in_flight(struct file *file, const char *buffer,
        osp->opd_syn_max_rpc_in_flight = val;
        return count;
 }
+LPROC_SEQ_FOPS(osp_max_rpcs_in_flight);
 
-static int osp_rd_max_rpcs_in_prog(char *page, char **start, off_t off,
-                                  int count, int *eof, void *data)
+/**
+ * Show maximum number of RPCs in processing allowed
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_max_rpcs_in_prog_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device       *dev = data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
-       int                      rc;
 
        if (osp == NULL)
                return -EINVAL;
 
-       rc = snprintf(page, count, "%u\n", osp->opd_syn_max_rpc_in_progress);
-       return rc;
+       return seq_printf(m, "%u\n", osp->opd_syn_max_rpc_in_progress);
 }
 
-static int osp_wr_max_rpcs_in_prog(struct file *file, const char *buffer,
-                                  unsigned long count, void *data)
+/**
+ * Change maximum number of RPCs in processing allowed
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents maximum number
+ * \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
+osp_max_rpcs_in_prog_seq_write(struct file *file, const char *buffer,
+                               size_t count, loff_t *off)
 {
-       struct obd_device       *dev = data;
+       struct seq_file         *m = file->private_data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
        int                      val, rc;
 
@@ -194,23 +291,43 @@ static int osp_wr_max_rpcs_in_prog(struct file *file, const char *buffer,
 
        return count;
 }
+LPROC_SEQ_FOPS(osp_max_rpcs_in_prog);
 
-static int osp_rd_create_count(char *page, char **start, off_t off, int count,
-                              int *eof, void *data)
+/**
+ * Show number of objects to precreate next time
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_create_count_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev);
 
        if (osp == NULL || osp->opd_pre == NULL)
                return 0;
 
-       return snprintf(page, count, "%d\n", osp->opd_pre_grow_count);
+       return seq_printf(m, "%d\n", osp->opd_pre_grow_count);
 }
 
-static int osp_wr_create_count(struct file *file, const char *buffer,
-                              unsigned long count, void *data)
+/**
+ * Change number of objects to precreate next time
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents number of objects to precreate
+ * \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
+osp_create_count_seq_write(struct file *file, const char *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 osp_device       *osp = lu2osp_dev(obd->obd_lu_dev);
        int                      val, rc, i;
 
@@ -242,23 +359,43 @@ static int osp_wr_create_count(struct file *file, const char *buffer,
 
        return count;
 }
+LPROC_SEQ_FOPS(osp_create_count);
 
-static int osp_rd_max_create_count(char *page, char **start, off_t off,
-                                  int count, int *eof, void *data)
+/**
+ * Show maximum number of objects to precreate
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_max_create_count_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev);
 
        if (osp == NULL || osp->opd_pre == NULL)
                return 0;
 
-       return snprintf(page, count, "%d\n", osp->opd_pre_max_grow_count);
+       return seq_printf(m, "%d\n", osp->opd_pre_max_grow_count);
 }
 
-static int osp_wr_max_create_count(struct file *file, const char *buffer,
-                                  unsigned long count, void *data)
+/**
+ * Change maximum number of objects to precreate
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents maximum number
+ * \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
+osp_max_create_count_seq_write(struct file *file, const char *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 osp_device       *osp = lu2osp_dev(obd->obd_lu_dev);
        int                      val, rc;
 
@@ -281,89 +418,144 @@ static int osp_wr_max_create_count(struct file *file, const char *buffer,
 
        return count;
 }
+LPROC_SEQ_FOPS(osp_max_create_count);
 
-static int osp_rd_prealloc_next_id(char *page, char **start, off_t off,
-                                  int count, int *eof, void *data)
+/**
+ * Show last id to assign in creation
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_prealloc_next_id_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev);
 
        if (osp == NULL || osp->opd_pre == NULL)
                return 0;
 
-       return snprintf(page, count, "%u\n",
-                       fid_oid(&osp->opd_pre_used_fid) + 1);
+       return seq_printf(m, "%u\n", fid_oid(&osp->opd_pre_used_fid) + 1);
 }
+LPROC_SEQ_FOPS_RO(osp_prealloc_next_id);
 
-static int osp_rd_prealloc_last_id(char *page, char **start, off_t off,
-                                  int count, int *eof, void *data)
+/**
+ * Show last created id OST reported
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_prealloc_last_id_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev);
 
        if (osp == NULL || osp->opd_pre == NULL)
                return 0;
 
-       return snprintf(page, count, "%u\n",
-                       fid_oid(&osp->opd_pre_last_created_fid));
+       return seq_printf(m, "%u\n", fid_oid(&osp->opd_pre_last_created_fid));
 }
+LPROC_SEQ_FOPS_RO(osp_prealloc_last_id);
 
-static int osp_rd_prealloc_next_seq(char *page, char **start, off_t off,
-                                   int count, int *eof, void *data)
+/**
+ * Show next FID sequence to precreate
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_prealloc_next_seq_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev);
 
        if (osp == NULL || osp->opd_pre == NULL)
                return 0;
 
-       return snprintf(page, count, LPX64"\n",
-                       fid_seq(&osp->opd_pre_used_fid));
+       return seq_printf(m, LPX64"\n", fid_seq(&osp->opd_pre_used_fid));
 }
+LPROC_SEQ_FOPS_RO(osp_prealloc_next_seq);
 
-static int osp_rd_prealloc_last_seq(char *page, char **start, off_t off,
-                                   int count, int *eof, void *data)
+/**
+ * Show last created FID sequence OST reported
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_prealloc_last_seq_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev);
 
        if (osp == NULL || osp->opd_pre == NULL)
                return 0;
 
-       return snprintf(page, count, LPX64"\n",
+       return seq_printf(m, LPX64"\n",
                        fid_seq(&osp->opd_pre_last_created_fid));
 }
+LPROC_SEQ_FOPS_RO(osp_prealloc_last_seq);
 
-static int osp_rd_prealloc_reserved(char *page, char **start, off_t off,
-                                   int count, int *eof, void *data)
+/**
+ * Show the number of ids reserved by declare
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_prealloc_reserved_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *obd = data;
+       struct obd_device *obd = m->private;
        struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev);
 
        if (osp == NULL || osp->opd_pre == NULL)
                return 0;
 
-       return snprintf(page, count, LPU64"\n", osp->opd_pre_reserved);
+       return seq_printf(m, LPU64"\n", osp->opd_pre_reserved);
 }
+LPROC_SEQ_FOPS_RO(osp_prealloc_reserved);
 
-static int osp_rd_maxage(char *page, char **start, off_t off,
-                        int count, int *eof, void *data)
+/**
+ * Show interval (in seconds) to update statfs data
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_maxage_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device       *dev = data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
-       int                      rc;
 
        if (osp == NULL)
                return -EINVAL;
 
-       rc = snprintf(page, count, "%u\n", osp->opd_statfs_maxage);
-       return rc;
+       return seq_printf(m, "%u\n", osp->opd_statfs_maxage);
 }
 
-static int osp_wr_maxage(struct file *file, const char *buffer,
-                        unsigned long count, void *data)
+/**
+ * Change interval to update statfs data
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents statfs interval (in seconds)
+ * \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
+osp_maxage_seq_write(struct file *file, const char *buffer,
+                       size_t count, loff_t *off)
 {
-       struct obd_device       *dev = data;
+       struct seq_file         *m = file->private_data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
        int                      val, rc;
 
@@ -381,156 +573,279 @@ static int osp_wr_maxage(struct file *file, const char *buffer,
 
        return count;
 }
+LPROC_SEQ_FOPS(osp_maxage);
 
-static int osp_rd_pre_status(char *page, char **start, off_t off,
-                            int count, int *eof, void *data)
+/**
+ * Show current precreation status: output 0 means success, otherwise negative
+ * number is printed
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_pre_status_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device       *dev = data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
-       int                      rc;
 
        if (osp == NULL || osp->opd_pre == NULL)
                return -EINVAL;
 
-       rc = snprintf(page, count, "%d\n", osp->opd_pre_status);
-       return rc;
+       return seq_printf(m, "%d\n", osp->opd_pre_status);
 }
+LPROC_SEQ_FOPS_RO(osp_pre_status);
 
-static int osp_rd_destroys_in_flight(char *page, char **start, off_t off,
-                                    int count, int *eof, void *data)
+/**
+ * Show the number of RPCs in processing (including uncommitted by OST) plus
+ * changes to sync, i.e. this is the total number of changes OST needs to apply
+ * and commit.
+ *
+ * This counter is used to determine if OST has space returned. A zero value
+ * indicates that OST storage space consumed by destroyed objects has been freed
+ * on disk, the associated llog records have been cleared, and no synchronous
+ * RPC are being processed.
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_destroys_in_flight_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device *dev = data;
+       struct obd_device *dev = m->private;
        struct osp_device *osp = lu2osp_dev(dev->obd_lu_dev);
 
        if (osp == NULL)
                return -EINVAL;
 
-       /*
-        * This counter used to determine if OST has space returned.
-        * Now we need to wait for the following:
-        * - sync changes are zero - no llog records
-        * - sync in progress are zero - no RPCs in flight
-        */
-       return snprintf(page, count, "%lu\n",
-                       osp->opd_syn_rpc_in_progress + osp->opd_syn_changes);
+       return seq_printf(m, "%lu\n",
+                         osp->opd_syn_rpc_in_progress + osp->opd_syn_changes);
 }
+LPROC_SEQ_FOPS_RO(osp_destroys_in_flight);
 
-static int osp_rd_old_sync_processed(char *page, char **start, off_t off,
-                                    int count, int *eof, void *data)
+/**
+ * Show changes synced from previous mount
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_old_sync_processed_seq_show(struct seq_file *m, void *data)
 {
-       struct obd_device       *dev = data;
+       struct obd_device       *dev = m->private;
        struct osp_device       *osp = lu2osp_dev(dev->obd_lu_dev);
-       int                      rc;
 
        if (osp == NULL)
                return -EINVAL;
 
-       rc = snprintf(page, count, "%d\n", osp->opd_syn_prev_done);
-       return rc;
+       return seq_printf(m, "%d\n", osp->opd_syn_prev_done);
 }
+LPROC_SEQ_FOPS_RO(osp_old_sync_processed);
+
+/**
+ * Show maximum number of RPCs in flight
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int
+osp_lfsck_max_rpcs_in_flight_seq_show(struct seq_file *m, void *data)
+{
+       struct obd_device *dev = m->private;
+       __u32 max;
 
-static struct lprocfs_vars lprocfs_osp_obd_vars[] = {
-       { "uuid",               lprocfs_rd_uuid, 0, 0 },
-       { "ping",               0, lprocfs_wr_ping, 0, 0, 0222 },
-       { "connect_flags",      lprocfs_rd_connect_flags, 0, 0 },
-       { "ost_server_uuid",    lprocfs_rd_server_uuid, 0, 0 },
-       { "ost_conn_uuid",      lprocfs_rd_conn_uuid, 0, 0 },
-       { "active",             osp_rd_active, osp_wr_active, 0 },
-       { "max_rpcs_in_flight", osp_rd_max_rpcs_in_flight,
-                               osp_wr_max_rpcs_in_flight, 0 },
-       { "max_rpcs_in_progress", osp_rd_max_rpcs_in_prog,
-                                 osp_wr_max_rpcs_in_prog, 0 },
-       { "create_count",       osp_rd_create_count,
-                               osp_wr_create_count, 0 },
-       { "max_create_count",   osp_rd_max_create_count,
-                               osp_wr_max_create_count, 0 },
-       { "prealloc_next_id",   osp_rd_prealloc_next_id, 0, 0 },
-       { "prealloc_next_seq",  osp_rd_prealloc_next_seq, 0, 0 },
-       { "prealloc_last_id",   osp_rd_prealloc_last_id,  0, 0 },
-       { "prealloc_last_seq",  osp_rd_prealloc_last_seq, 0, 0 },
-       { "prealloc_reserved",  osp_rd_prealloc_reserved, 0, 0 },
-       { "timeouts",           lprocfs_rd_timeouts, 0, 0 },
-       { "import",             lprocfs_rd_import, lprocfs_wr_import, 0 },
-       { "state",              lprocfs_rd_state, 0, 0 },
-       { "maxage",             osp_rd_maxage, osp_wr_maxage, 0 },
-       { "prealloc_status",    osp_rd_pre_status, 0, 0 },
-       { "sync_changes",       osp_rd_syn_changes, 0, 0 },
-       { "sync_in_flight",     osp_rd_syn_in_flight, 0, 0 },
-       { "sync_in_progress",   osp_rd_syn_in_prog, 0, 0 },
-       { "old_sync_processed", osp_rd_old_sync_processed, 0, 0 },
+       max = obd_get_max_rpcs_in_flight(&dev->u.cli);
+       return seq_printf(m, "%u\n", max);
+}
 
-       /* for compatibility reasons */
-       { "destroys_in_flight", osp_rd_destroys_in_flight, 0, 0 },
-       { 0 }
-};
+/**
+ * Change maximum number of RPCs in flight
+ *
+ * \param[in] file     proc file
+ * \param[in] buffer   string which represents maximum number of RPCs in flight
+ * \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
+osp_lfsck_max_rpcs_in_flight_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 *dev = m->private;
+       int val;
+       int rc;
+
+       rc = lprocfs_write_helper(buffer, count, &val);
+       if (rc == 0)
+               rc = obd_set_max_rpcs_in_flight(&dev->u.cli, val);
+
+       if (rc != 0)
+               count = rc;
+
+       return count;
+}
+LPROC_SEQ_FOPS(osp_lfsck_max_rpcs_in_flight);
+
+LPROC_SEQ_FOPS_WO_TYPE(osp, ping);
+LPROC_SEQ_FOPS_RO_TYPE(osp, uuid);
+LPROC_SEQ_FOPS_RO_TYPE(osp, connect_flags);
+LPROC_SEQ_FOPS_RO_TYPE(osp, server_uuid);
+LPROC_SEQ_FOPS_RO_TYPE(osp, conn_uuid);
+
+/**
+ * Show maximum pages per bulk RPC
+ *
+ * \param[in] m                seq_file handle
+ * \param[in] data     unused for single entry
+ * \retval             0 on success
+ * \retval             negative number on error
+ */
+static int osp_max_pages_per_rpc_seq_show(struct seq_file *m, void *v)
+{
+       return lprocfs_obd_max_pages_per_rpc_seq_show(m, m->private);
+}
+LPROC_SEQ_FOPS_RO(osp_max_pages_per_rpc);
+LPROC_SEQ_FOPS_RO_TYPE(osp, timeouts);
+
+LPROC_SEQ_FOPS_RW_TYPE(osp, import);
+LPROC_SEQ_FOPS_RO_TYPE(osp, state);
+
+static struct lprocfs_seq_vars lprocfs_osp_obd_vars[] = {
+       { .name =       "uuid",
+         .fops =       &osp_uuid_fops                  },
+       { .name =       "ping",
+         .fops =       &osp_ping_fops,
+         .proc_mode =  0222                            },
+       { .name =       "connect_flags",
+         .fops =       &osp_connect_flags_fops         },
+       { .name =       "ost_server_uuid",
+         .fops =       &osp_server_uuid_fops           },
+       { .name =       "ost_conn_uuid",
+         .fops =       &osp_conn_uuid_fops             },
+       { .name =       "active",
+         .fops =       &osp_active_fops                },
+       { .name =       "max_rpcs_in_flight",
+         .fops =       &osp_max_rpcs_in_flight_fops    },
+       { .name =       "max_rpcs_in_progress",
+         .fops =       &osp_max_rpcs_in_prog_fops      },
+       { .name =       "create_count",
+         .fops =       &osp_create_count_fops          },
+       { .name =       "max_create_count",
+         .fops =       &osp_max_create_count_fops      },
+       { .name =       "prealloc_next_id",
+         .fops =       &osp_prealloc_next_id_fops      },
+       { .name =       "prealloc_next_seq",
+         .fops =       &osp_prealloc_next_seq_fops     },
+       { .name =       "prealloc_last_id",
+         .fops =       &osp_prealloc_last_id_fops      },
+       { .name =       "prealloc_last_seq",
+         .fops =       &osp_prealloc_last_seq_fops     },
+       { .name =       "prealloc_reserved",
+         .fops =       &osp_prealloc_reserved_fops     },
+       { .name =       "timeouts",
+         .fops =       &osp_timeouts_fops              },
+       { .name =       "import",
+         .fops =       &osp_import_fops                },
+       { .name =       "state",
+         .fops =       &osp_state_fops                 },
+       { .name =       "maxage",
+         .fops =       &osp_maxage_fops                },
+       { .name =       "prealloc_status",
+         .fops =       &osp_pre_status_fops            },
+       { .name =       "sync_changes",
+         .fops =       &osp_syn_changes_fops           },
+       { .name =       "sync_in_flight",
+         .fops =       &osp_syn_in_flight_fops         },
+       { .name =       "sync_in_progress",
+         .fops =       &osp_syn_in_prog_fops           },
+       { .name =       "old_sync_processed",
+         .fops =       &osp_old_sync_processed_fops    },
 
-static struct lprocfs_vars lprocfs_osp_osd_vars[] = {
-       { "blocksize",          lprocfs_dt_rd_blksize, 0, 0 },
-       { "kbytestotal",        lprocfs_dt_rd_kbytestotal, 0, 0 },
-       { "kbytesfree",         lprocfs_dt_rd_kbytesfree, 0, 0 },
-       { "kbytesavail",        lprocfs_dt_rd_kbytesavail, 0, 0 },
-       { "filestotal",         lprocfs_dt_rd_filestotal, 0, 0 },
-       { "filesfree",          lprocfs_dt_rd_filesfree, 0, 0 },
+       /* for compatibility reasons */
+       { .name =       "destroys_in_flight",
+         .fops =       &osp_destroys_in_flight_fops            },
+       { .name =       "lfsck_max_rpcs_in_flight",
+         .fops =       &osp_lfsck_max_rpcs_in_flight_fops      },
        { 0 }
 };
 
-static struct lprocfs_vars lprocfs_osp_module_vars[] = {
-       { "num_refs",           lprocfs_rd_numrefs, 0, 0 },
+LPROC_SEQ_FOPS_RO_TYPE(osp, dt_blksize);
+LPROC_SEQ_FOPS_RO_TYPE(osp, dt_kbytestotal);
+LPROC_SEQ_FOPS_RO_TYPE(osp, dt_kbytesfree);
+LPROC_SEQ_FOPS_RO_TYPE(osp, dt_kbytesavail);
+LPROC_SEQ_FOPS_RO_TYPE(osp, dt_filestotal);
+LPROC_SEQ_FOPS_RO_TYPE(osp, dt_filesfree);
+
+static struct lprocfs_seq_vars lprocfs_osp_osd_vars[] = {
+       { .name =       "blocksize",
+         .fops =       &osp_dt_blksize_fops            },
+       { .name =       "kbytestotal",
+         .fops =       &osp_dt_kbytestotal_fops        },
+       { .name =       "kbytesfree",
+         .fops =       &osp_dt_kbytesfree_fops         },
+       { .name =       "kbytesavail",
+         .fops =       &osp_dt_kbytesavail_fops        },
+       { .name =       "filestotal",
+         .fops =       &osp_dt_filestotal_fops         },
+       { .name =       "filesfree",
+         .fops =       &osp_dt_filesfree_fops          },
        { 0 }
 };
 
-void lprocfs_osp_init_vars(struct lprocfs_static_vars *lvars)
-{
-       lvars->module_vars = lprocfs_osp_module_vars;
-       lvars->obd_vars = lprocfs_osp_obd_vars;
-}
-
+/**
+ * Initialize OSP lprocfs
+ *
+ * param[in] osp       OSP device
+ */
 void osp_lprocfs_init(struct osp_device *osp)
 {
        struct obd_device       *obd = osp->opd_obd;
-       struct proc_dir_entry   *osc_proc_dir;
+       struct proc_dir_entry   *osc_proc_dir = NULL;
+       struct obd_type         *type;
        int                      rc;
 
-       obd->obd_proc_entry = lprocfs_register(obd->obd_name,
-                                              obd->obd_type->typ_procroot,
-                                              lprocfs_osp_osd_vars,
-                                              &osp->opd_dt_dev);
-       if (IS_ERR(obd->obd_proc_entry)) {
-               CERROR("%s: can't register in lprocfs: %ld\n",
-                      obd->obd_name, PTR_ERR(obd->obd_proc_entry));
-               obd->obd_proc_entry = NULL;
+       obd->obd_vars = lprocfs_osp_obd_vars;
+       if (lprocfs_seq_obd_setup(obd) != 0)
                return;
-       }
 
-       rc = lprocfs_add_vars(obd->obd_proc_entry, lprocfs_osp_obd_vars, obd);
+       rc = lprocfs_seq_add_vars(obd->obd_proc_entry, lprocfs_osp_osd_vars,
+                                 &osp->opd_dt_dev);
        if (rc) {
-               CERROR("%s: can't register in lprocfs: %ld\n",
-                      obd->obd_name, PTR_ERR(obd->obd_proc_entry));
+               CERROR("%s: can't register in lprocfs, rc %d\n",
+                      obd->obd_name, rc);
                return;
        }
 
        ptlrpc_lprocfs_register_obd(obd);
 
+       if (osp->opd_connect_mdt || !strstr(obd->obd_name, "osc"))
+               return;
+
+       /* If the real OSC is present which is the case for setups
+        * with both server and clients on the same node then use
+        * the OSC's proc root */
+       type = class_search_type(LUSTRE_OSC_NAME);
+       if (type != NULL && type->typ_procroot != NULL)
+               osc_proc_dir = type->typ_procroot;
+       else
+               osc_proc_dir = obd->obd_type->typ_procsym;
+
+       if (osc_proc_dir == NULL)
+               return;
+
        /* for compatibility we link old procfs's OSC entries to osp ones */
-       if (!osp->opd_connect_mdt) {
-               osc_proc_dir = lprocfs_srch(proc_lustre_root, "osc");
-               if (osc_proc_dir) {
-                       cfs_proc_dir_entry_t    *symlink = NULL;
-                       char                    *name;
-
-                       OBD_ALLOC(name, strlen(obd->obd_name) + 1);
-                       if (name == NULL)
-                               return;
-
-                       strcpy(name, obd->obd_name);
-                       if (strstr(name, "osc"))
-                               symlink = lprocfs_add_symlink(name,
-                                               osc_proc_dir, "../osp/%s",
-                                               obd->obd_name);
-                       OBD_FREE(name, strlen(obd->obd_name) + 1);
-                       osp->opd_symlink = symlink;
-               }
-       }
+       osp->opd_symlink = lprocfs_add_symlink(obd->obd_name, osc_proc_dir,
+                                              "../osp/%s", obd->obd_name);
+       if (osp->opd_symlink == NULL)
+               CERROR("could not register OSC symlink for "
+                      "/proc/fs/lustre/osp/%s.", obd->obd_name);
 }
 
 #endif /* LPROCFS */