/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * 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.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2015, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/llite/llite_lib.c
 *
 * Lustre Light Super operations
 */

#define DEBUG_SUBSYSTEM S_LLITE

#include <linux/module.h>
#include <linux/statfs.h>
#include <linux/types.h>
#include <linux/mm.h>

#include "../include/lustre_lite.h"
#include "../include/lustre_ha.h"
#include "../include/lustre_dlm.h"
#include "../include/lprocfs_status.h"
#include "../include/lustre_disk.h"
#include "../include/lustre_param.h"
#include "../include/lustre_log.h"
#include "../include/cl_object.h"
#include "../include/obd_cksum.h"
#include "llite_internal.h"

struct kmem_cache *ll_file_data_slab;
struct dentry *llite_root;
struct kset *llite_kset;

#ifndef log2
#define log2(n) ffz(~(n))
#endif

static struct ll_sb_info *ll_init_sbi(struct super_block *sb)
{
        struct ll_sb_info *sbi = NULL;
        unsigned long pages;
        unsigned long lru_page_max;
        struct sysinfo si;
        class_uuid_t uuid;
        int i;

        sbi = kzalloc(sizeof(*sbi), GFP_NOFS);
        if (!sbi)
                return NULL;

        spin_lock_init(&sbi->ll_lock);
        mutex_init(&sbi->ll_lco.lco_lock);
        spin_lock_init(&sbi->ll_pp_extent_lock);
        spin_lock_init(&sbi->ll_process_lock);
        sbi->ll_rw_stats_on = 0;

        si_meminfo(&si);
        pages = si.totalram - si.totalhigh;
        if (pages >> (20 - PAGE_SHIFT) < 512)
                lru_page_max = pages / 2;
        else
                lru_page_max = (pages / 4) * 3;

        /* initialize lru data */
        atomic_set(&sbi->ll_cache.ccc_users, 0);
        sbi->ll_cache.ccc_lru_max = lru_page_max;
        atomic_set(&sbi->ll_cache.ccc_lru_left, lru_page_max);
        spin_lock_init(&sbi->ll_cache.ccc_lru_lock);
        INIT_LIST_HEAD(&sbi->ll_cache.ccc_lru);

        sbi->ll_ra_info.ra_max_pages_per_file = min(pages / 32,
                                           SBI_DEFAULT_READAHEAD_MAX);
        sbi->ll_ra_info.ra_max_pages = sbi->ll_ra_info.ra_max_pages_per_file;
        sbi->ll_ra_info.ra_max_read_ahead_whole_pages =
                                           SBI_DEFAULT_READAHEAD_WHOLE_MAX;

        ll_generate_random_uuid(uuid);
        class_uuid_unparse(uuid, &sbi->ll_sb_uuid);
        CDEBUG(D_CONFIG, "generated uuid: %s\n", sbi->ll_sb_uuid.uuid);

        sbi->ll_flags |= LL_SBI_VERBOSE;
        sbi->ll_flags |= LL_SBI_CHECKSUM;

        sbi->ll_flags |= LL_SBI_LRU_RESIZE;

        for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
                spin_lock_init(&sbi->ll_rw_extents_info.pp_extents[i].
                               pp_r_hist.oh_lock);
                spin_lock_init(&sbi->ll_rw_extents_info.pp_extents[i].
                               pp_w_hist.oh_lock);
        }

        /* metadata statahead is enabled by default */
        sbi->ll_sa_max = LL_SA_RPC_DEF;
        atomic_set(&sbi->ll_sa_total, 0);
        atomic_set(&sbi->ll_sa_wrong, 0);
        atomic_set(&sbi->ll_agl_total, 0);
        sbi->ll_flags |= LL_SBI_AGL_ENABLED;

        sbi->ll_sb = sb;

        return sbi;
}

static void ll_free_sbi(struct super_block *sb)
{
        struct ll_sb_info *sbi = ll_s2sbi(sb);

        kfree(sbi);
}

static int client_common_fill_super(struct super_block *sb, char *md, char *dt,
                                    struct vfsmount *mnt)
{
        struct inode *root = NULL;
        struct ll_sb_info *sbi = ll_s2sbi(sb);
        struct obd_device *obd;
        struct obd_statfs *osfs = NULL;
        struct ptlrpc_request *request = NULL;
        struct obd_connect_data *data = NULL;
        struct obd_uuid *uuid;
        struct md_op_data *op_data;
        struct lustre_md lmd;
        u64 valid;
        int size, err, checksum;

        obd = class_name2obd(md);
        if (!obd) {
                CERROR("MD %s: not setup or attached\n", md);
                return -EINVAL;
        }

        data = kzalloc(sizeof(*data), GFP_NOFS);
        if (!data)
                return -ENOMEM;

        osfs = kzalloc(sizeof(*osfs), GFP_NOFS);
        if (!osfs) {
                kfree(data);
                return -ENOMEM;
        }

        if (llite_root) {
                err = ldebugfs_register_mountpoint(llite_root, sb, dt, md);
                if (err < 0)
                        CERROR("could not register mount in <debugfs>/lustre/llite\n");
        }

        /* indicate the features supported by this client */
        data->ocd_connect_flags = OBD_CONNECT_IBITS    | OBD_CONNECT_NODEVOH  |
                                  OBD_CONNECT_ATTRFID  |
                                  OBD_CONNECT_VERSION  | OBD_CONNECT_BRW_SIZE |
                                  OBD_CONNECT_CANCELSET | OBD_CONNECT_FID     |
                                  OBD_CONNECT_AT       | OBD_CONNECT_LOV_V3   |
                                  OBD_CONNECT_RMT_CLIENT | OBD_CONNECT_VBR    |
                                  OBD_CONNECT_FULL20   | OBD_CONNECT_64BITHASH|
                                  OBD_CONNECT_EINPROGRESS |
                                  OBD_CONNECT_JOBSTATS | OBD_CONNECT_LVB_TYPE |
                                  OBD_CONNECT_LAYOUTLOCK |
                                  OBD_CONNECT_PINGLESS |
                                  OBD_CONNECT_MAX_EASIZE |
                                  OBD_CONNECT_FLOCK_DEAD |
                                  OBD_CONNECT_DISP_STRIPE;

        if (sbi->ll_flags & LL_SBI_SOM_PREVIEW)
                data->ocd_connect_flags |= OBD_CONNECT_SOM;

        if (sbi->ll_flags & LL_SBI_LRU_RESIZE)
                data->ocd_connect_flags |= OBD_CONNECT_LRU_RESIZE;
#ifdef CONFIG_FS_POSIX_ACL
        data->ocd_connect_flags |= OBD_CONNECT_ACL | OBD_CONNECT_UMASK;
#endif

        if (OBD_FAIL_CHECK(OBD_FAIL_MDC_LIGHTWEIGHT))
                /* flag mdc connection as lightweight, only used for test
                 * purpose, use with care
                 */
                data->ocd_connect_flags |= OBD_CONNECT_LIGHTWEIGHT;

        data->ocd_ibits_known = MDS_INODELOCK_FULL;
        data->ocd_version = LUSTRE_VERSION_CODE;

        if (sb->s_flags & MS_RDONLY)
                data->ocd_connect_flags |= OBD_CONNECT_RDONLY;
        if (sbi->ll_flags & LL_SBI_USER_XATTR)
                data->ocd_connect_flags |= OBD_CONNECT_XATTR;

        if (sbi->ll_flags & LL_SBI_FLOCK)
                sbi->ll_fop = &ll_file_operations_flock;
        else if (sbi->ll_flags & LL_SBI_LOCALFLOCK)
                sbi->ll_fop = &ll_file_operations;
        else
                sbi->ll_fop = &ll_file_operations_noflock;

        /* real client */
        data->ocd_connect_flags |= OBD_CONNECT_REAL;
        if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
                data->ocd_connect_flags |= OBD_CONNECT_RMT_CLIENT_FORCE;

        data->ocd_brw_size = MD_MAX_BRW_SIZE;

        err = obd_connect(NULL, &sbi->ll_md_exp, obd, &sbi->ll_sb_uuid,
                          data, NULL);
        if (err == -EBUSY) {
                LCONSOLE_ERROR_MSG(0x14f, "An MDT (md %s) is performing recovery, of which this client is not a part. Please wait for recovery to complete, abort, or time out.\n",
                                   md);
                goto out;
        } else if (err) {
                CERROR("cannot connect to %s: rc = %d\n", md, err);
                goto out;
        }

        sbi->ll_md_exp->exp_connect_data = *data;

        err = obd_fid_init(sbi->ll_md_exp->exp_obd, sbi->ll_md_exp,
                           LUSTRE_SEQ_METADATA);
        if (err) {
                CERROR("%s: Can't init metadata layer FID infrastructure, rc = %d\n",
                       sbi->ll_md_exp->exp_obd->obd_name, err);
                goto out_md;
        }

        /* For mount, we only need fs info from MDT0, and also in DNE, it
         * can make sure the client can be mounted as long as MDT0 is
         * available
         */
        err = obd_statfs(NULL, sbi->ll_md_exp, osfs,
                         cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
                         OBD_STATFS_FOR_MDT0);
        if (err)
                goto out_md_fid;

        /* This needs to be after statfs to ensure connect has finished.
         * Note that "data" does NOT contain the valid connect reply.
         * If connecting to a 1.8 server there will be no LMV device, so
         * we can access the MDC export directly and exp_connect_flags will
         * be non-zero, but if accessing an upgraded 2.1 server it will
         * have the correct flags filled in.
         * XXX: fill in the LMV exp_connect_flags from MDC(s).
         */
        valid = exp_connect_flags(sbi->ll_md_exp) & CLIENT_CONNECT_MDT_REQD;
        if (exp_connect_flags(sbi->ll_md_exp) != 0 &&
            valid != CLIENT_CONNECT_MDT_REQD) {
                char *buf;

                buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
                if (!buf) {
                        err = -ENOMEM;
                        goto out_md_fid;
                }
                obd_connect_flags2str(buf, PAGE_SIZE,
                                      valid ^ CLIENT_CONNECT_MDT_REQD, ",");
                LCONSOLE_ERROR_MSG(0x170, "Server %s does not support feature(s) needed for correct operation of this client (%s). Please upgrade server or downgrade client.\n",
                                   sbi->ll_md_exp->exp_obd->obd_name, buf);
                kfree(buf);
                err = -EPROTO;
                goto out_md_fid;
        }

        size = sizeof(*data);
        err = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_CONN_DATA),
                           KEY_CONN_DATA,  &size, data, NULL);
        if (err) {
                CERROR("%s: Get connect data failed: rc = %d\n",
                       sbi->ll_md_exp->exp_obd->obd_name, err);
                goto out_md_fid;
        }

        LASSERT(osfs->os_bsize);
        sb->s_blocksize = osfs->os_bsize;
        sb->s_blocksize_bits = log2(osfs->os_bsize);
        sb->s_magic = LL_SUPER_MAGIC;
        sb->s_maxbytes = MAX_LFS_FILESIZE;
        sbi->ll_namelen = osfs->os_namelen;

        if ((sbi->ll_flags & LL_SBI_USER_XATTR) &&
            !(data->ocd_connect_flags & OBD_CONNECT_XATTR)) {
                LCONSOLE_INFO("Disabling user_xattr feature because it is not supported on the server\n");
                sbi->ll_flags &= ~LL_SBI_USER_XATTR;
        }

        if (data->ocd_connect_flags & OBD_CONNECT_ACL) {
                sb->s_flags |= MS_POSIXACL;
                sbi->ll_flags |= LL_SBI_ACL;
        } else {
                LCONSOLE_INFO("client wants to enable acl, but mdt not!\n");
                sb->s_flags &= ~MS_POSIXACL;
                sbi->ll_flags &= ~LL_SBI_ACL;
        }

        if (data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT) {
                if (!(sbi->ll_flags & LL_SBI_RMT_CLIENT)) {
                        sbi->ll_flags |= LL_SBI_RMT_CLIENT;
                        LCONSOLE_INFO("client is set as remote by default.\n");
                }
        } else {
                if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
                        sbi->ll_flags &= ~LL_SBI_RMT_CLIENT;
                        LCONSOLE_INFO("client claims to be remote, but server rejected, forced to be local.\n");
                }
        }

        if (data->ocd_connect_flags & OBD_CONNECT_64BITHASH)
                sbi->ll_flags |= LL_SBI_64BIT_HASH;

        if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE)
                sbi->ll_md_brw_size = data->ocd_brw_size;
        else
                sbi->ll_md_brw_size = PAGE_SIZE;

        if (data->ocd_connect_flags & OBD_CONNECT_LAYOUTLOCK) {
                LCONSOLE_INFO("Layout lock feature supported.\n");
                sbi->ll_flags |= LL_SBI_LAYOUT_LOCK;
        }

        if (data->ocd_ibits_known & MDS_INODELOCK_XATTR) {
                if (!(data->ocd_connect_flags & OBD_CONNECT_MAX_EASIZE)) {
                        LCONSOLE_INFO(
                                "%s: disabling xattr cache due to unknown maximum xattr size.\n",
                                dt);
                } else {
                        sbi->ll_flags |= LL_SBI_XATTR_CACHE;
                        sbi->ll_xattr_cache_enabled = 1;
                }
        }

        obd = class_name2obd(dt);
        if (!obd) {
                CERROR("DT %s: not setup or attached\n", dt);
                err = -ENODEV;
                goto out_md_fid;
        }

        data->ocd_connect_flags = OBD_CONNECT_GRANT     | OBD_CONNECT_VERSION  |
                                  OBD_CONNECT_REQPORTAL | OBD_CONNECT_BRW_SIZE |
                                  OBD_CONNECT_CANCELSET | OBD_CONNECT_FID      |
                                  OBD_CONNECT_SRVLOCK   | OBD_CONNECT_TRUNCLOCK|
                                  OBD_CONNECT_AT | OBD_CONNECT_RMT_CLIENT |
                                  OBD_CONNECT_OSS_CAPA | OBD_CONNECT_VBR|
                                  OBD_CONNECT_FULL20 | OBD_CONNECT_64BITHASH |
                                  OBD_CONNECT_MAXBYTES |
                                  OBD_CONNECT_EINPROGRESS |
                                  OBD_CONNECT_JOBSTATS | OBD_CONNECT_LVB_TYPE |
                                  OBD_CONNECT_LAYOUTLOCK | OBD_CONNECT_PINGLESS;

        if (sbi->ll_flags & LL_SBI_SOM_PREVIEW)
                data->ocd_connect_flags |= OBD_CONNECT_SOM;

        if (!OBD_FAIL_CHECK(OBD_FAIL_OSC_CONNECT_CKSUM)) {
                /* OBD_CONNECT_CKSUM should always be set, even if checksums are
                 * disabled by default, because it can still be enabled on the
                 * fly via /sys. As a consequence, we still need to come to an
                 * agreement on the supported algorithms at connect time
                 */
                data->ocd_connect_flags |= OBD_CONNECT_CKSUM;

                if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CKSUM_ADLER_ONLY))
                        data->ocd_cksum_types = OBD_CKSUM_ADLER;
                else
                        data->ocd_cksum_types = cksum_types_supported_client();
        }

        data->ocd_connect_flags |= OBD_CONNECT_LRU_RESIZE;
        if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
                data->ocd_connect_flags |= OBD_CONNECT_RMT_CLIENT_FORCE;

        CDEBUG(D_RPCTRACE, "ocd_connect_flags: %#llx ocd_version: %d ocd_grant: %d\n",
               data->ocd_connect_flags,
               data->ocd_version, data->ocd_grant);

        obd->obd_upcall.onu_owner = &sbi->ll_lco;
        obd->obd_upcall.onu_upcall = cl_ocd_update;

        data->ocd_brw_size = DT_MAX_BRW_SIZE;

        err = obd_connect(NULL, &sbi->ll_dt_exp, obd, &sbi->ll_sb_uuid, data,
                          NULL);
        if (err == -EBUSY) {
                LCONSOLE_ERROR_MSG(0x150, "An OST (dt %s) is performing recovery, of which this client is not a part.  Please wait for recovery to complete, abort, or time out.\n",
                                   dt);
                goto out_md;
        } else if (err) {
                CERROR("%s: Cannot connect to %s: rc = %d\n",
                       sbi->ll_dt_exp->exp_obd->obd_name, dt, err);
                goto out_md;
        }

        sbi->ll_dt_exp->exp_connect_data = *data;

        err = obd_fid_init(sbi->ll_dt_exp->exp_obd, sbi->ll_dt_exp,
                           LUSTRE_SEQ_METADATA);
        if (err) {
                CERROR("%s: Can't init data layer FID infrastructure, rc = %d\n",
                       sbi->ll_dt_exp->exp_obd->obd_name, err);
                goto out_dt;
        }

        mutex_lock(&sbi->ll_lco.lco_lock);
        sbi->ll_lco.lco_flags = data->ocd_connect_flags;
        sbi->ll_lco.lco_md_exp = sbi->ll_md_exp;
        sbi->ll_lco.lco_dt_exp = sbi->ll_dt_exp;
        mutex_unlock(&sbi->ll_lco.lco_lock);

        fid_zero(&sbi->ll_root_fid);
        err = md_getstatus(sbi->ll_md_exp, &sbi->ll_root_fid);
        if (err) {
                CERROR("cannot mds_connect: rc = %d\n", err);
                goto out_lock_cn_cb;
        }
        if (!fid_is_sane(&sbi->ll_root_fid)) {
                CERROR("%s: Invalid root fid "DFID" during mount\n",
                       sbi->ll_md_exp->exp_obd->obd_name,
                       PFID(&sbi->ll_root_fid));
                err = -EINVAL;
                goto out_lock_cn_cb;
        }
        CDEBUG(D_SUPER, "rootfid "DFID"\n", PFID(&sbi->ll_root_fid));

        sb->s_op = &lustre_super_operations;
#if THREAD_SIZE >= 8192 /*b=17630*/
        sb->s_export_op = &lustre_export_operations;
#endif

        /* make root inode
         * XXX: move this to after cbd setup?
         */
        valid = OBD_MD_FLGETATTR | OBD_MD_FLBLOCKS;
        if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
                valid |= OBD_MD_FLRMTPERM;
        else if (sbi->ll_flags & LL_SBI_ACL)
                valid |= OBD_MD_FLACL;

        op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
        if (!op_data) {
                err = -ENOMEM;
                goto out_lock_cn_cb;
        }

        op_data->op_fid1 = sbi->ll_root_fid;
        op_data->op_mode = 0;
        op_data->op_valid = valid;

        err = md_getattr(sbi->ll_md_exp, op_data, &request);
        kfree(op_data);
        if (err) {
                CERROR("%s: md_getattr failed for root: rc = %d\n",
                       sbi->ll_md_exp->exp_obd->obd_name, err);
                goto out_lock_cn_cb;
        }

        err = md_get_lustre_md(sbi->ll_md_exp, request, sbi->ll_dt_exp,
                               sbi->ll_md_exp, &lmd);
        if (err) {
                CERROR("failed to understand root inode md: rc = %d\n", err);
                ptlrpc_req_finished(request);
                goto out_lock_cn_cb;
        }

        LASSERT(fid_is_sane(&sbi->ll_root_fid));
        root = ll_iget(sb, cl_fid_build_ino(&sbi->ll_root_fid,
                                            sbi->ll_flags & LL_SBI_32BIT_API),
                       &lmd);
        md_free_lustre_md(sbi->ll_md_exp, &lmd);
        ptlrpc_req_finished(request);

        if (!(root)) {
                if (lmd.lsm)
                        obd_free_memmd(sbi->ll_dt_exp, &lmd.lsm);
#ifdef CONFIG_FS_POSIX_ACL
                if (lmd.posix_acl) {
                        posix_acl_release(lmd.posix_acl);
                        lmd.posix_acl = NULL;
                }
#endif
                err = -EBADF;
                CERROR("lustre_lite: bad iget4 for root\n");
                goto out_root;
        }

        err = ll_close_thread_start(&sbi->ll_lcq);
        if (err) {
                CERROR("cannot start close thread: rc %d\n", err);
                goto out_root;
        }

#ifdef CONFIG_FS_POSIX_ACL
        if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
                rct_init(&sbi->ll_rct);
                et_init(&sbi->ll_et);
        }
#endif

        checksum = sbi->ll_flags & LL_SBI_CHECKSUM;
        err = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
                                 KEY_CHECKSUM, sizeof(checksum), &checksum,
                                 NULL);
        cl_sb_init(sb);

        err = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CACHE_SET),
                                 KEY_CACHE_SET, sizeof(sbi->ll_cache),
                                 &sbi->ll_cache, NULL);

        sb->s_root = d_make_root(root);
        if (!sb->s_root) {
                CERROR("%s: can't make root dentry\n",
                       ll_get_fsname(sb, NULL, 0));
                err = -ENOMEM;
                goto out_lock_cn_cb;
        }

        sbi->ll_sdev_orig = sb->s_dev;

        /* We set sb->s_dev equal on all lustre clients in order to support
         * NFS export clustering.  NFSD requires that the FSID be the same
         * on all clients.
         */
        /* s_dev is also used in lt_compare() to compare two fs, but that is
         * only a node-local comparison.
         */
        uuid = obd_get_uuid(sbi->ll_md_exp);
        if (uuid) {
                sb->s_dev = get_uuid2int(uuid->uuid, strlen(uuid->uuid));
                get_uuid2fsid(uuid->uuid, strlen(uuid->uuid), &sbi->ll_fsid);
        }

        kfree(data);
        kfree(osfs);

        return err;
out_root:
        iput(root);
out_lock_cn_cb:
        obd_fid_fini(sbi->ll_dt_exp->exp_obd);
out_dt:
        obd_disconnect(sbi->ll_dt_exp);
        sbi->ll_dt_exp = NULL;
        /* Make sure all OScs are gone, since cl_cache is accessing sbi. */
        obd_zombie_barrier();
out_md_fid:
        obd_fid_fini(sbi->ll_md_exp->exp_obd);
out_md:
        obd_disconnect(sbi->ll_md_exp);
        sbi->ll_md_exp = NULL;
out:
        kfree(data);
        kfree(osfs);
        ldebugfs_unregister_mountpoint(sbi);
        return err;
}

int ll_get_max_mdsize(struct ll_sb_info *sbi, int *lmmsize)
{
        int size, rc;

        *lmmsize = obd_size_diskmd(sbi->ll_dt_exp, NULL);
        size = sizeof(int);
        rc = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_MAX_EASIZE),
                          KEY_MAX_EASIZE, &size, lmmsize, NULL);
        if (rc)
                CERROR("Get max mdsize error rc %d\n", rc);

        return rc;
}

int ll_get_default_mdsize(struct ll_sb_info *sbi, int *lmmsize)
{
        int size, rc;

        size = sizeof(int);
        rc = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_DEFAULT_EASIZE),
                          KEY_DEFAULT_EASIZE, &size, lmmsize, NULL);
        if (rc)
                CERROR("Get default mdsize error rc %d\n", rc);

        return rc;
}

static void client_common_put_super(struct super_block *sb)
{
        struct ll_sb_info *sbi = ll_s2sbi(sb);

#ifdef CONFIG_FS_POSIX_ACL
        if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
                et_fini(&sbi->ll_et);
                rct_fini(&sbi->ll_rct);
        }
#endif

        ll_close_thread_shutdown(sbi->ll_lcq);

        cl_sb_fini(sb);

        obd_fid_fini(sbi->ll_dt_exp->exp_obd);
        obd_disconnect(sbi->ll_dt_exp);
        sbi->ll_dt_exp = NULL;
        /* wait till all OSCs are gone, since cl_cache is accessing sbi.
         * see LU-2543.
         */
        obd_zombie_barrier();

        ldebugfs_unregister_mountpoint(sbi);

        obd_fid_fini(sbi->ll_md_exp->exp_obd);
        obd_disconnect(sbi->ll_md_exp);
        sbi->ll_md_exp = NULL;
}

void ll_kill_super(struct super_block *sb)
{
        struct ll_sb_info *sbi;

        /* not init sb ?*/
        if (!(sb->s_flags & MS_ACTIVE))
                return;

        sbi = ll_s2sbi(sb);
        /* we need to restore s_dev from changed for clustered NFS before
         * put_super because new kernels have cached s_dev and change sb->s_dev
         * in put_super not affected real removing devices
         */
        if (sbi) {
                sb->s_dev = sbi->ll_sdev_orig;
                sbi->ll_umounting = 1;
        }
}

static inline int ll_set_opt(const char *opt, char *data, int fl)
{
        if (strncmp(opt, data, strlen(opt)) != 0)
                return 0;
        else
                return fl;
}

/* non-client-specific mount options are parsed in lmd_parse */
static int ll_options(char *options, int *flags)
{
        int tmp;
        char *s1 = options, *s2;

        if (!options)
                return 0;

        CDEBUG(D_CONFIG, "Parsing opts %s\n", options);

        while (*s1) {
                CDEBUG(D_SUPER, "next opt=%s\n", s1);
                tmp = ll_set_opt("nolock", s1, LL_SBI_NOLCK);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("flock", s1, LL_SBI_FLOCK);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("localflock", s1, LL_SBI_LOCALFLOCK);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("noflock", s1, LL_SBI_FLOCK|LL_SBI_LOCALFLOCK);
                if (tmp) {
                        *flags &= ~tmp;
                        goto next;
                }
                tmp = ll_set_opt("user_xattr", s1, LL_SBI_USER_XATTR);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("nouser_xattr", s1, LL_SBI_USER_XATTR);
                if (tmp) {
                        *flags &= ~tmp;
                        goto next;
                }
                tmp = ll_set_opt("remote_client", s1, LL_SBI_RMT_CLIENT);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("user_fid2path", s1, LL_SBI_USER_FID2PATH);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("nouser_fid2path", s1, LL_SBI_USER_FID2PATH);
                if (tmp) {
                        *flags &= ~tmp;
                        goto next;
                }

                tmp = ll_set_opt("checksum", s1, LL_SBI_CHECKSUM);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("nochecksum", s1, LL_SBI_CHECKSUM);
                if (tmp) {
                        *flags &= ~tmp;
                        goto next;
                }
                tmp = ll_set_opt("lruresize", s1, LL_SBI_LRU_RESIZE);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("nolruresize", s1, LL_SBI_LRU_RESIZE);
                if (tmp) {
                        *flags &= ~tmp;
                        goto next;
                }
                tmp = ll_set_opt("lazystatfs", s1, LL_SBI_LAZYSTATFS);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("nolazystatfs", s1, LL_SBI_LAZYSTATFS);
                if (tmp) {
                        *flags &= ~tmp;
                        goto next;
                }
                tmp = ll_set_opt("som_preview", s1, LL_SBI_SOM_PREVIEW);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("32bitapi", s1, LL_SBI_32BIT_API);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("verbose", s1, LL_SBI_VERBOSE);
                if (tmp) {
                        *flags |= tmp;
                        goto next;
                }
                tmp = ll_set_opt("noverbose", s1, LL_SBI_VERBOSE);
                if (tmp) {
                        *flags &= ~tmp;
                        goto next;
                }
                LCONSOLE_ERROR_MSG(0x152, "Unknown option '%s', won't mount.\n",
                                   s1);
                return -EINVAL;

next:
                /* Find next opt */
                s2 = strchr(s1, ',');
                if (!s2)
                        break;
                s1 = s2 + 1;
        }
        return 0;
}

void ll_lli_init(struct ll_inode_info *lli)
{
        lli->lli_inode_magic = LLI_INODE_MAGIC;
        lli->lli_flags = 0;
        lli->lli_ioepoch = 0;
        lli->lli_maxbytes = MAX_LFS_FILESIZE;
        spin_lock_init(&lli->lli_lock);
        lli->lli_posix_acl = NULL;
        lli->lli_remote_perms = NULL;
        mutex_init(&lli->lli_rmtperm_mutex);
        /* Do not set lli_fid, it has been initialized already. */
        fid_zero(&lli->lli_pfid);
        INIT_LIST_HEAD(&lli->lli_close_list);
        lli->lli_rmtperm_time = 0;
        lli->lli_pending_och = NULL;
        lli->lli_mds_read_och = NULL;
        lli->lli_mds_write_och = NULL;
        lli->lli_mds_exec_och = NULL;
        lli->lli_open_fd_read_count = 0;
        lli->lli_open_fd_write_count = 0;
        lli->lli_open_fd_exec_count = 0;
        mutex_init(&lli->lli_och_mutex);
        spin_lock_init(&lli->lli_agl_lock);
        lli->lli_has_smd = false;
        spin_lock_init(&lli->lli_layout_lock);
        ll_layout_version_set(lli, LL_LAYOUT_GEN_NONE);
        lli->lli_clob = NULL;

        init_rwsem(&lli->lli_xattrs_list_rwsem);
        mutex_init(&lli->lli_xattrs_enq_lock);

        LASSERT(lli->lli_vfs_inode.i_mode != 0);
        if (S_ISDIR(lli->lli_vfs_inode.i_mode)) {
                mutex_init(&lli->lli_readdir_mutex);
                lli->lli_opendir_key = NULL;
                lli->lli_sai = NULL;
                spin_lock_init(&lli->lli_sa_lock);
                lli->lli_opendir_pid = 0;
        } else {
                mutex_init(&lli->lli_size_mutex);
                lli->lli_symlink_name = NULL;
                init_rwsem(&lli->lli_trunc_sem);
                mutex_init(&lli->lli_write_mutex);
                init_rwsem(&lli->lli_glimpse_sem);
                lli->lli_glimpse_time = 0;
                INIT_LIST_HEAD(&lli->lli_agl_list);
                lli->lli_agl_index = 0;
                lli->lli_async_rc = 0;
        }
        mutex_init(&lli->lli_layout_mutex);
}

static inline int ll_bdi_register(struct backing_dev_info *bdi)
{
        static atomic_t ll_bdi_num = ATOMIC_INIT(0);

        bdi->name = "lustre";
        return bdi_register(bdi, NULL, "lustre-%d",
                            atomic_inc_return(&ll_bdi_num));
}

int ll_fill_super(struct super_block *sb, struct vfsmount *mnt)
{
        struct lustre_profile *lprof = NULL;
        struct lustre_sb_info *lsi = s2lsi(sb);
        struct ll_sb_info *sbi;
        char  *dt = NULL, *md = NULL;
        char  *profilenm = get_profile_name(sb);
        struct config_llog_instance *cfg;
        int    err;

        CDEBUG(D_VFSTRACE, "VFS Op: sb %p\n", sb);

        cfg = kzalloc(sizeof(*cfg), GFP_NOFS);
        if (!cfg)
                return -ENOMEM;

        try_module_get(THIS_MODULE);

        /* client additional sb info */
        lsi->lsi_llsbi = sbi = ll_init_sbi(sb);
        if (!sbi) {
                module_put(THIS_MODULE);
                kfree(cfg);
                return -ENOMEM;
        }

        err = ll_options(lsi->lsi_lmd->lmd_opts, &sbi->ll_flags);
        if (err)
                goto out_free;

        err = bdi_init(&lsi->lsi_bdi);
        if (err)
                goto out_free;
        lsi->lsi_flags |= LSI_BDI_INITIALIZED;
        lsi->lsi_bdi.capabilities = 0;
        err = ll_bdi_register(&lsi->lsi_bdi);
        if (err)
                goto out_free;

        sb->s_bdi = &lsi->lsi_bdi;
        /* kernel >= 2.6.38 store dentry operations in sb->s_d_op. */
        sb->s_d_op = &ll_d_ops;

        /* Generate a string unique to this super, in case some joker tries
         * to mount the same fs at two mount points.
         * Use the address of the super itself.
         */
        cfg->cfg_instance = sb;
        cfg->cfg_uuid = lsi->lsi_llsbi->ll_sb_uuid;
        cfg->cfg_callback = class_config_llog_handler;
        /* set up client obds */
        err = lustre_process_log(sb, profilenm, cfg);
        if (err < 0) {
                CERROR("Unable to process log: %d\n", err);
                goto out_free;
        }

        /* Profile set with LCFG_MOUNTOPT so we can find our mdc and osc obds */
        lprof = class_get_profile(profilenm);
        if (!lprof) {
                LCONSOLE_ERROR_MSG(0x156, "The client profile '%s' could not be read from the MGS.  Does that filesystem exist?\n",
                                   profilenm);
                err = -EINVAL;
                goto out_free;
        }
        CDEBUG(D_CONFIG, "Found profile %s: mdc=%s osc=%s\n", profilenm,
               lprof->lp_md, lprof->lp_dt);

        dt = kasprintf(GFP_NOFS, "%s-%p", lprof->lp_dt, cfg->cfg_instance);
        if (!dt) {
                err = -ENOMEM;
                goto out_free;
        }

        md = kasprintf(GFP_NOFS, "%s-%p", lprof->lp_md, cfg->cfg_instance);
        if (!md) {
                err = -ENOMEM;
                goto out_free;
        }

        /* connections, registrations, sb setup */
        err = client_common_fill_super(sb, md, dt, mnt);

out_free:
        kfree(md);
        kfree(dt);
        if (err)
                ll_put_super(sb);
        else if (sbi->ll_flags & LL_SBI_VERBOSE)
                LCONSOLE_WARN("Mounted %s\n", profilenm);

        kfree(cfg);
        return err;
} /* ll_fill_super */

void ll_put_super(struct super_block *sb)
{
        struct config_llog_instance cfg, params_cfg;
        struct obd_device *obd;
        struct lustre_sb_info *lsi = s2lsi(sb);
        struct ll_sb_info *sbi = ll_s2sbi(sb);
        char *profilenm = get_profile_name(sb);
        int next, force = 1;

        CDEBUG(D_VFSTRACE, "VFS Op: sb %p - %s\n", sb, profilenm);

        cfg.cfg_instance = sb;
        lustre_end_log(sb, profilenm, &cfg);

        params_cfg.cfg_instance = sb;
        lustre_end_log(sb, PARAMS_FILENAME, &params_cfg);

        if (sbi->ll_md_exp) {
                obd = class_exp2obd(sbi->ll_md_exp);
                if (obd)
                        force = obd->obd_force;
        }

        /* We need to set force before the lov_disconnect in
         * lustre_common_put_super, since l_d cleans up osc's as well.
         */
        if (force) {
                next = 0;
                while ((obd = class_devices_in_group(&sbi->ll_sb_uuid,
                                                     &next)) != NULL) {
                        obd->obd_force = force;
                }
        }

        if (sbi->ll_lcq) {
                /* Only if client_common_fill_super succeeded */
                client_common_put_super(sb);
        }

        next = 0;
        while ((obd = class_devices_in_group(&sbi->ll_sb_uuid, &next)))
                class_manual_cleanup(obd);

        if (sbi->ll_flags & LL_SBI_VERBOSE)
                LCONSOLE_WARN("Unmounted %s\n", profilenm ? profilenm : "");

        if (profilenm)
                class_del_profile(profilenm);

        if (lsi->lsi_flags & LSI_BDI_INITIALIZED) {
                bdi_destroy(&lsi->lsi_bdi);
                lsi->lsi_flags &= ~LSI_BDI_INITIALIZED;
        }

        ll_free_sbi(sb);
        lsi->lsi_llsbi = NULL;

        lustre_common_put_super(sb);

        module_put(THIS_MODULE);
} /* client_put_super */

struct inode *ll_inode_from_resource_lock(struct ldlm_lock *lock)
{
        struct inode *inode = NULL;

        /* NOTE: we depend on atomic igrab() -bzzz */
        lock_res_and_lock(lock);
        if (lock->l_resource->lr_lvb_inode) {
                struct ll_inode_info *lli;

                lli = ll_i2info(lock->l_resource->lr_lvb_inode);
                if (lli->lli_inode_magic == LLI_INODE_MAGIC) {
                        inode = igrab(lock->l_resource->lr_lvb_inode);
                } else {
                        inode = lock->l_resource->lr_lvb_inode;
                        LDLM_DEBUG_LIMIT(inode->i_state & I_FREEING ?  D_INFO :
                                         D_WARNING, lock, "lr_lvb_inode %p is bogus: magic %08x",
                                         lock->l_resource->lr_lvb_inode,
                                         lli->lli_inode_magic);
                        inode = NULL;
                }
        }
        unlock_res_and_lock(lock);
        return inode;
}

void ll_clear_inode(struct inode *inode)
{
        struct ll_inode_info *lli = ll_i2info(inode);
        struct ll_sb_info *sbi = ll_i2sbi(inode);

        CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n", inode->i_ino,
               inode->i_generation, inode);

        if (S_ISDIR(inode->i_mode)) {
                /* these should have been cleared in ll_file_release */
                LASSERT(!lli->lli_opendir_key);
                LASSERT(!lli->lli_sai);
                LASSERT(lli->lli_opendir_pid == 0);
        }

        spin_lock(&lli->lli_lock);
        ll_i2info(inode)->lli_flags &= ~LLIF_MDS_SIZE_LOCK;
        spin_unlock(&lli->lli_lock);
        md_null_inode(sbi->ll_md_exp, ll_inode2fid(inode));

        LASSERT(!lli->lli_open_fd_write_count);
        LASSERT(!lli->lli_open_fd_read_count);
        LASSERT(!lli->lli_open_fd_exec_count);

        if (lli->lli_mds_write_och)
                ll_md_real_close(inode, FMODE_WRITE);
        if (lli->lli_mds_exec_och)
                ll_md_real_close(inode, FMODE_EXEC);
        if (lli->lli_mds_read_och)
                ll_md_real_close(inode, FMODE_READ);

        if (S_ISLNK(inode->i_mode)) {
                kfree(lli->lli_symlink_name);
                lli->lli_symlink_name = NULL;
        }

        ll_xattr_cache_destroy(inode);

        if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
                LASSERT(!lli->lli_posix_acl);
                if (lli->lli_remote_perms) {
                        free_rmtperm_hash(lli->lli_remote_perms);
                        lli->lli_remote_perms = NULL;
                }
        }
#ifdef CONFIG_FS_POSIX_ACL
        else if (lli->lli_posix_acl) {
                LASSERT(atomic_read(&lli->lli_posix_acl->a_refcount) == 1);
                LASSERT(!lli->lli_remote_perms);
                posix_acl_release(lli->lli_posix_acl);
                lli->lli_posix_acl = NULL;
        }
#endif
        lli->lli_inode_magic = LLI_INODE_DEAD;

        if (!S_ISDIR(inode->i_mode))
                LASSERT(list_empty(&lli->lli_agl_list));

        /*
         * XXX This has to be done before lsm is freed below, because
         * cl_object still uses inode lsm.
         */
        cl_inode_fini(inode);
        lli->lli_has_smd = false;
}

#define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)

static int ll_md_setattr(struct dentry *dentry, struct md_op_data *op_data,
                         struct md_open_data **mod)
{
        struct lustre_md md;
        struct inode *inode = d_inode(dentry);
        struct ll_sb_info *sbi = ll_i2sbi(inode);
        struct ptlrpc_request *request = NULL;
        int rc, ia_valid;

        op_data = ll_prep_md_op_data(op_data, inode, NULL, NULL, 0, 0,
                                     LUSTRE_OPC_ANY, NULL);
        if (IS_ERR(op_data))
                return PTR_ERR(op_data);

        rc = md_setattr(sbi->ll_md_exp, op_data, NULL, 0, NULL, 0,
                        &request, mod);
        if (rc) {
                ptlrpc_req_finished(request);
                if (rc == -ENOENT) {
                        clear_nlink(inode);
                        /* Unlinked special device node? Or just a race?
                         * Pretend we did everything.
                         */
                        if (!S_ISREG(inode->i_mode) &&
                            !S_ISDIR(inode->i_mode)) {
                                ia_valid = op_data->op_attr.ia_valid;
                                op_data->op_attr.ia_valid &= ~TIMES_SET_FLAGS;
                                rc = simple_setattr(dentry, &op_data->op_attr);
                                op_data->op_attr.ia_valid = ia_valid;
                        }
                } else if (rc != -EPERM && rc != -EACCES && rc != -ETXTBSY) {
                        CERROR("md_setattr fails: rc = %d\n", rc);
                }
                return rc;
        }

        rc = md_get_lustre_md(sbi->ll_md_exp, request, sbi->ll_dt_exp,
                              sbi->ll_md_exp, &md);
        if (rc) {
                ptlrpc_req_finished(request);
                return rc;
        }

        ia_valid = op_data->op_attr.ia_valid;
        /* inode size will be in cl_setattr_ost, can't do it now since dirty
         * cache is not cleared yet.
         */
        op_data->op_attr.ia_valid &= ~(TIMES_SET_FLAGS | ATTR_SIZE);
        rc = simple_setattr(dentry, &op_data->op_attr);
        op_data->op_attr.ia_valid = ia_valid;

        /* Extract epoch data if obtained. */
        op_data->op_handle = md.body->handle;
        op_data->op_ioepoch = md.body->ioepoch;

        ll_update_inode(inode, &md);
        ptlrpc_req_finished(request);

        return rc;
}

/* Close IO epoch and send Size-on-MDS attribute update. */
static int ll_setattr_done_writing(struct inode *inode,
                                   struct md_op_data *op_data,
                                   struct md_open_data *mod)
{
        struct ll_inode_info *lli = ll_i2info(inode);
        int rc = 0;

        if (!S_ISREG(inode->i_mode))
                return 0;

        CDEBUG(D_INODE, "Epoch %llu closed on "DFID" for truncate\n",
               op_data->op_ioepoch, PFID(&lli->lli_fid));

        op_data->op_flags = MF_EPOCH_CLOSE;
        ll_done_writing_attr(inode, op_data);
        ll_pack_inode2opdata(inode, op_data, NULL);

        rc = md_done_writing(ll_i2sbi(inode)->ll_md_exp, op_data, mod);
        if (rc == -EAGAIN)
                /* MDS has instructed us to obtain Size-on-MDS attribute
                 * from OSTs and send setattr to back to MDS.
                 */
                rc = ll_som_update(inode, op_data);
        else if (rc)
                CERROR("inode %lu mdc truncate failed: rc = %d\n",
                       inode->i_ino, rc);
        return rc;
}

/* If this inode has objects allocated to it (lsm != NULL), then the OST
 * object(s) determine the file size and mtime.  Otherwise, the MDS will
 * keep these values until such a time that objects are allocated for it.
 * We do the MDS operations first, as it is checking permissions for us.
 * We don't to the MDS RPC if there is nothing that we want to store there,
 * otherwise there is no harm in updating mtime/atime on the MDS if we are
 * going to do an RPC anyways.
 *
 * If we are doing a truncate, we will send the mtime and ctime updates
 * to the OST with the punch RPC, otherwise we do an explicit setattr RPC.
 * I don't believe it is possible to get e.g. ATTR_MTIME_SET and ATTR_SIZE
 * at the same time.
 *
 * In case of HSMimport, we only set attr on MDS.
 */
int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import)
{
        struct inode *inode = d_inode(dentry);
        struct ll_inode_info *lli = ll_i2info(inode);
        struct md_op_data *op_data = NULL;
        struct md_open_data *mod = NULL;
        bool file_is_released = false;
        int rc = 0, rc1 = 0;

        CDEBUG(D_VFSTRACE,
               "%s: setattr inode %p/fid:" DFID
               " from %llu to %llu, valid %x, hsm_import %d\n",
               ll_get_fsname(inode->i_sb, NULL, 0), inode,
               PFID(&lli->lli_fid), i_size_read(inode), attr->ia_size,
               attr->ia_valid, hsm_import);

        if (attr->ia_valid & ATTR_SIZE) {
                /* Check new size against VFS/VM file size limit and rlimit */
                rc = inode_newsize_ok(inode, attr->ia_size);
                if (rc)
                        return rc;

                /* The maximum Lustre file size is variable, based on the
                 * OST maximum object size and number of stripes.  This
                 * needs another check in addition to the VFS check above.
                 */
                if (attr->ia_size > ll_file_maxbytes(inode)) {
                        CDEBUG(D_INODE, "file "DFID" too large %llu > %llu\n",
                               PFID(&lli->lli_fid), attr->ia_size,
                               ll_file_maxbytes(inode));
                        return -EFBIG;
                }

                attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
        }

        /* POSIX: check before ATTR_*TIME_SET set (from inode_change_ok) */
        if (attr->ia_valid & TIMES_SET_FLAGS) {
                if ((!uid_eq(current_fsuid(), inode->i_uid)) &&
                    !capable(CFS_CAP_FOWNER))
                        return -EPERM;
        }

        /* We mark all of the fields "set" so MDS/OST does not re-set them */
        if (attr->ia_valid & ATTR_CTIME) {
                attr->ia_ctime = CURRENT_TIME;
                attr->ia_valid |= ATTR_CTIME_SET;
        }
        if (!(attr->ia_valid & ATTR_ATIME_SET) &&
            (attr->ia_valid & ATTR_ATIME)) {
                attr->ia_atime = CURRENT_TIME;
                attr->ia_valid |= ATTR_ATIME_SET;
        }
        if (!(attr->ia_valid & ATTR_MTIME_SET) &&
            (attr->ia_valid & ATTR_MTIME)) {
                attr->ia_mtime = CURRENT_TIME;
                attr->ia_valid |= ATTR_MTIME_SET;
        }

        if (attr->ia_valid & (ATTR_MTIME | ATTR_CTIME))
                CDEBUG(D_INODE, "setting mtime %lu, ctime %lu, now = %llu\n",
                       LTIME_S(attr->ia_mtime), LTIME_S(attr->ia_ctime),
                       (s64)ktime_get_real_seconds());

        /* If we are changing file size, file content is modified, flag it. */
        if (attr->ia_valid & ATTR_SIZE) {
                attr->ia_valid |= MDS_OPEN_OWNEROVERRIDE;
                spin_lock(&lli->lli_lock);
                lli->lli_flags |= LLIF_DATA_MODIFIED;
                spin_unlock(&lli->lli_lock);
        }

        /* We always do an MDS RPC, even if we're only changing the size;
         * only the MDS knows whether truncate() should fail with -ETXTBUSY
         */

        op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
        if (!op_data)
                return -ENOMEM;

        if (!S_ISDIR(inode->i_mode))
                inode_unlock(inode);

        memcpy(&op_data->op_attr, attr, sizeof(*attr));

        /* Open epoch for truncate. */
        if (exp_connect_som(ll_i2mdexp(inode)) &&
            (attr->ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MTIME_SET)))
                op_data->op_flags = MF_EPOCH_OPEN;

        /* truncate on a released file must failed with -ENODATA,
         * so size must not be set on MDS for released file
         * but other attributes must be set
         */
        if (S_ISREG(inode->i_mode)) {
                struct lov_stripe_md *lsm;
                __u32 gen;

                ll_layout_refresh(inode, &gen);
                lsm = ccc_inode_lsm_get(inode);
                if (lsm && lsm->lsm_pattern & LOV_PATTERN_F_RELEASED)
                        file_is_released = true;
                ccc_inode_lsm_put(inode, lsm);
        }

        /* if not in HSM import mode, clear size attr for released file
         * we clear the attribute send to MDT in op_data, not the original
         * received from caller in attr which is used later to
         * decide return code
         */
        if (file_is_released && (attr->ia_valid & ATTR_SIZE) && !hsm_import)
                op_data->op_attr.ia_valid &= ~ATTR_SIZE;

        rc = ll_md_setattr(dentry, op_data, &mod);
        if (rc)
                goto out;

        /* truncate failed (only when non HSM import), others succeed */
        if (file_is_released) {
                if ((attr->ia_valid & ATTR_SIZE) && !hsm_import)
                        rc = -ENODATA;
                else
                        rc = 0;
                goto out;
        }

        /* RPC to MDT is sent, cancel data modification flag */
        if (op_data->op_bias & MDS_DATA_MODIFIED) {
                spin_lock(&lli->lli_lock);
                lli->lli_flags &= ~LLIF_DATA_MODIFIED;
                spin_unlock(&lli->lli_lock);
        }

        ll_ioepoch_open(lli, op_data->op_ioepoch);
        if (!S_ISREG(inode->i_mode)) {
                rc = 0;
                goto out;
        }

        if (attr->ia_valid & (ATTR_SIZE |
                              ATTR_ATIME | ATTR_ATIME_SET |
                              ATTR_MTIME | ATTR_MTIME_SET)) {
                /* For truncate and utimes sending attributes to OSTs, setting
                 * mtime/atime to the past will be performed under PW [0:EOF]
                 * extent lock (new_size:EOF for truncate).  It may seem
                 * excessive to send mtime/atime updates to OSTs when not
                 * setting times to past, but it is necessary due to possible
                 * time de-synchronization between MDT inode and OST objects
                 */
                if (attr->ia_valid & ATTR_SIZE)
                        down_write(&lli->lli_trunc_sem);
                rc = cl_setattr_ost(inode, attr);
                if (attr->ia_valid & ATTR_SIZE)
                        up_write(&lli->lli_trunc_sem);
        }
out:
        if (op_data->op_ioepoch) {
                rc1 = ll_setattr_done_writing(inode, op_data, mod);
                if (!rc)
                        rc = rc1;
        }
        ll_finish_md_op_data(op_data);

        if (!S_ISDIR(inode->i_mode)) {
                inode_lock(inode);
                if ((attr->ia_valid & ATTR_SIZE) && !hsm_import)
                        inode_dio_wait(inode);
        }

        ll_stats_ops_tally(ll_i2sbi(inode), (attr->ia_valid & ATTR_SIZE) ?
                        LPROC_LL_TRUNC : LPROC_LL_SETATTR, 1);

        return rc;
}

int ll_setattr(struct dentry *de, struct iattr *attr)
{
        int mode = d_inode(de)->i_mode;

        if ((attr->ia_valid & (ATTR_CTIME|ATTR_SIZE|ATTR_MODE)) ==
                              (ATTR_CTIME|ATTR_SIZE|ATTR_MODE))
                attr->ia_valid |= MDS_OPEN_OWNEROVERRIDE;

        if (((attr->ia_valid & (ATTR_MODE|ATTR_FORCE|ATTR_SIZE)) ==
                               (ATTR_SIZE|ATTR_MODE)) &&
            (((mode & S_ISUID) && !(attr->ia_mode & S_ISUID)) ||
             (((mode & (S_ISGID|S_IXGRP)) == (S_ISGID|S_IXGRP)) &&
              !(attr->ia_mode & S_ISGID))))
                attr->ia_valid |= ATTR_FORCE;

        if ((attr->ia_valid & ATTR_MODE) &&
            (mode & S_ISUID) &&
            !(attr->ia_mode & S_ISUID) &&
            !(attr->ia_valid & ATTR_KILL_SUID))
                attr->ia_valid |= ATTR_KILL_SUID;

        if ((attr->ia_valid & ATTR_MODE) &&
            ((mode & (S_ISGID|S_IXGRP)) == (S_ISGID|S_IXGRP)) &&
            !(attr->ia_mode & S_ISGID) &&
            !(attr->ia_valid & ATTR_KILL_SGID))
                attr->ia_valid |= ATTR_KILL_SGID;

        return ll_setattr_raw(de, attr, false);
}

int ll_statfs_internal(struct super_block *sb, struct obd_statfs *osfs,
                       __u64 max_age, __u32 flags)
{
        struct ll_sb_info *sbi = ll_s2sbi(sb);
        struct obd_statfs obd_osfs;
        int rc;

        rc = obd_statfs(NULL, sbi->ll_md_exp, osfs, max_age, flags);
        if (rc) {
                CERROR("md_statfs fails: rc = %d\n", rc);
                return rc;
        }

        osfs->os_type = sb->s_magic;

        CDEBUG(D_SUPER, "MDC blocks %llu/%llu objects %llu/%llu\n",
               osfs->os_bavail, osfs->os_blocks, osfs->os_ffree,
               osfs->os_files);

        if (sbi->ll_flags & LL_SBI_LAZYSTATFS)
                flags |= OBD_STATFS_NODELAY;

        rc = obd_statfs_rqset(sbi->ll_dt_exp, &obd_osfs, max_age, flags);
        if (rc) {
                CERROR("obd_statfs fails: rc = %d\n", rc);
                return rc;
        }

        CDEBUG(D_SUPER, "OSC blocks %llu/%llu objects %llu/%llu\n",
               obd_osfs.os_bavail, obd_osfs.os_blocks, obd_osfs.os_ffree,
               obd_osfs.os_files);

        osfs->os_bsize = obd_osfs.os_bsize;
        osfs->os_blocks = obd_osfs.os_blocks;
        osfs->os_bfree = obd_osfs.os_bfree;
        osfs->os_bavail = obd_osfs.os_bavail;

        /* If we don't have as many objects free on the OST as inodes
         * on the MDS, we reduce the total number of inodes to
         * compensate, so that the "inodes in use" number is correct.
         */
        if (obd_osfs.os_ffree < osfs->os_ffree) {
                osfs->os_files = (osfs->os_files - osfs->os_ffree) +
                        obd_osfs.os_ffree;
                osfs->os_ffree = obd_osfs.os_ffree;
        }

        return rc;
}

int ll_statfs(struct dentry *de, struct kstatfs *sfs)
{
        struct super_block *sb = de->d_sb;
        struct obd_statfs osfs;
        int rc;

        CDEBUG(D_VFSTRACE, "VFS Op: at %llu jiffies\n", get_jiffies_64());
        ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_STAFS, 1);

        /* Some amount of caching on the client is allowed */
        rc = ll_statfs_internal(sb, &osfs,
                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
                                0);
        if (rc)
                return rc;

        statfs_unpack(sfs, &osfs);

        /* We need to downshift for all 32-bit kernels, because we can't
         * tell if the kernel is being called via sys_statfs64() or not.
         * Stop before overflowing f_bsize - in which case it is better
         * to just risk EOVERFLOW if caller is using old sys_statfs().
         */
        if (sizeof(long) < 8) {
                while (osfs.os_blocks > ~0UL && sfs->f_bsize < 0x40000000) {
                        sfs->f_bsize <<= 1;

                        osfs.os_blocks >>= 1;
                        osfs.os_bfree >>= 1;
                        osfs.os_bavail >>= 1;
                }
        }

        sfs->f_blocks = osfs.os_blocks;
        sfs->f_bfree = osfs.os_bfree;
        sfs->f_bavail = osfs.os_bavail;
        sfs->f_fsid = ll_s2sbi(sb)->ll_fsid;
        return 0;
}

void ll_inode_size_lock(struct inode *inode)
{
        struct ll_inode_info *lli;

        LASSERT(!S_ISDIR(inode->i_mode));

        lli = ll_i2info(inode);
        mutex_lock(&lli->lli_size_mutex);
}

void ll_inode_size_unlock(struct inode *inode)
{
        struct ll_inode_info *lli;

        lli = ll_i2info(inode);
        mutex_unlock(&lli->lli_size_mutex);
}

void ll_update_inode(struct inode *inode, struct lustre_md *md)
{
        struct ll_inode_info *lli = ll_i2info(inode);
        struct mdt_body *body = md->body;
        struct lov_stripe_md *lsm = md->lsm;
        struct ll_sb_info *sbi = ll_i2sbi(inode);

        LASSERT((lsm != NULL) == ((body->valid & OBD_MD_FLEASIZE) != 0));
        if (lsm) {
                if (!lli->lli_has_smd &&
                    !(sbi->ll_flags & LL_SBI_LAYOUT_LOCK))
                        cl_file_inode_init(inode, md);

                lli->lli_maxbytes = lsm->lsm_maxbytes;
                if (lli->lli_maxbytes > MAX_LFS_FILESIZE)
                        lli->lli_maxbytes = MAX_LFS_FILESIZE;
        }

        if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
                if (body->valid & OBD_MD_FLRMTPERM)
                        ll_update_remote_perm(inode, md->remote_perm);
        }
#ifdef CONFIG_FS_POSIX_ACL
        else if (body->valid & OBD_MD_FLACL) {
                spin_lock(&lli->lli_lock);
                if (lli->lli_posix_acl)
                        posix_acl_release(lli->lli_posix_acl);
                lli->lli_posix_acl = md->posix_acl;
                spin_unlock(&lli->lli_lock);
        }
#endif
        inode->i_ino = cl_fid_build_ino(&body->fid1,
                                        sbi->ll_flags & LL_SBI_32BIT_API);
        inode->i_generation = cl_fid_build_gen(&body->fid1);

        if (body->valid & OBD_MD_FLATIME) {
                if (body->atime > LTIME_S(inode->i_atime))
                        LTIME_S(inode->i_atime) = body->atime;
                lli->lli_lvb.lvb_atime = body->atime;
        }
        if (body->valid & OBD_MD_FLMTIME) {
                if (body->mtime > LTIME_S(inode->i_mtime)) {
                        CDEBUG(D_INODE, "setting ino %lu mtime from %lu to %llu\n",
                               inode->i_ino, LTIME_S(inode->i_mtime),
                               body->mtime);
                        LTIME_S(inode->i_mtime) = body->mtime;
                }
                lli->lli_lvb.lvb_mtime = body->mtime;
        }
        if (body->valid & OBD_MD_FLCTIME) {
                if (body->ctime > LTIME_S(inode->i_ctime))
                        LTIME_S(inode->i_ctime) = body->ctime;
                lli->lli_lvb.lvb_ctime = body->ctime;
        }
        if (body->valid & OBD_MD_FLMODE)
                inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
        if (body->valid & OBD_MD_FLTYPE)
                inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
        LASSERT(inode->i_mode != 0);
        if (S_ISREG(inode->i_mode))
                inode->i_blkbits = min(PTLRPC_MAX_BRW_BITS + 1,
                                       LL_MAX_BLKSIZE_BITS);
        else
                inode->i_blkbits = inode->i_sb->s_blocksize_bits;
        if (body->valid & OBD_MD_FLUID)
                inode->i_uid = make_kuid(&init_user_ns, body->uid);
        if (body->valid & OBD_MD_FLGID)
                inode->i_gid = make_kgid(&init_user_ns, body->gid);
        if (body->valid & OBD_MD_FLFLAGS)
                inode->i_flags = ll_ext_to_inode_flags(body->flags);
        if (body->valid & OBD_MD_FLNLINK)
                set_nlink(inode, body->nlink);
        if (body->valid & OBD_MD_FLRDEV)
                inode->i_rdev = old_decode_dev(body->rdev);

        if (body->valid & OBD_MD_FLID) {
                /* FID shouldn't be changed! */
                if (fid_is_sane(&lli->lli_fid)) {
                        LASSERTF(lu_fid_eq(&lli->lli_fid, &body->fid1),
                                 "Trying to change FID "DFID
                                 " to the "DFID", inode %lu/%u(%p)\n",
                                 PFID(&lli->lli_fid), PFID(&body->fid1),
                                 inode->i_ino, inode->i_generation, inode);
                } else
                        lli->lli_fid = body->fid1;
        }

        LASSERT(fid_seq(&lli->lli_fid) != 0);

        if (body->valid & OBD_MD_FLSIZE) {
                if (exp_connect_som(ll_i2mdexp(inode)) &&
                    S_ISREG(inode->i_mode)) {
                        struct lustre_handle lockh;
                        enum ldlm_mode mode;

                        /* As it is possible a blocking ast has been processed
                         * by this time, we need to check there is an UPDATE
                         * lock on the client and set LLIF_MDS_SIZE_LOCK holding
                         * it.
                         */
                        mode = ll_take_md_lock(inode, MDS_INODELOCK_UPDATE,
                                               &lockh, LDLM_FL_CBPENDING,
                                               LCK_CR | LCK_CW |
                                               LCK_PR | LCK_PW);
                        if (mode) {
                                if (lli->lli_flags & (LLIF_DONE_WRITING |
                                                      LLIF_EPOCH_PENDING |
                                                      LLIF_SOM_DIRTY)) {
                                        CERROR("ino %lu flags %u still has size authority! do not trust the size got from MDS\n",
                                               inode->i_ino, lli->lli_flags);
                                } else {
                                        /* Use old size assignment to avoid
                                         * deadlock bz14138 & bz14326
                                         */
                                        i_size_write(inode, body->size);
                                        spin_lock(&lli->lli_lock);
                                        lli->lli_flags |= LLIF_MDS_SIZE_LOCK;
                                        spin_unlock(&lli->lli_lock);
                                }
                                ldlm_lock_decref(&lockh, mode);
                        }
                } else {
                        /* Use old size assignment to avoid
                         * deadlock bz14138 & bz14326
                         */
                        i_size_write(inode, body->size);

                        CDEBUG(D_VFSTRACE, "inode=%lu, updating i_size %llu\n",
                               inode->i_ino, (unsigned long long)body->size);
                }

                if (body->valid & OBD_MD_FLBLOCKS)
                        inode->i_blocks = body->blocks;
        }

        if (body->valid & OBD_MD_TSTATE) {
                if (body->t_state & MS_RESTORE)
                        lli->lli_flags |= LLIF_FILE_RESTORING;
        }
}

void ll_read_inode2(struct inode *inode, void *opaque)
{
        struct lustre_md *md = opaque;
        struct ll_inode_info *lli = ll_i2info(inode);

        CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
               PFID(&lli->lli_fid), inode);

        LASSERT(!lli->lli_has_smd);

        /* Core attributes from the MDS first.  This is a new inode, and
         * the VFS doesn't zero times in the core inode so we have to do
         * it ourselves.  They will be overwritten by either MDS or OST
         * attributes - we just need to make sure they aren't newer.
         */
        LTIME_S(inode->i_mtime) = 0;
        LTIME_S(inode->i_atime) = 0;
        LTIME_S(inode->i_ctime) = 0;
        inode->i_rdev = 0;
        ll_update_inode(inode, md);

        /* OIDEBUG(inode); */

        if (S_ISREG(inode->i_mode)) {
                struct ll_sb_info *sbi = ll_i2sbi(inode);

                inode->i_op = &ll_file_inode_operations;
                inode->i_fop = sbi->ll_fop;
                inode->i_mapping->a_ops = (struct address_space_operations *)&ll_aops;
        } else if (S_ISDIR(inode->i_mode)) {
                inode->i_op = &ll_dir_inode_operations;
                inode->i_fop = &ll_dir_operations;
        } else if (S_ISLNK(inode->i_mode)) {
                inode->i_op = &ll_fast_symlink_inode_operations;
        } else {
                inode->i_op = &ll_special_inode_operations;

                init_special_inode(inode, inode->i_mode,
                                   inode->i_rdev);
        }
}

void ll_delete_inode(struct inode *inode)
{
        struct cl_inode_info *lli = cl_i2info(inode);

        if (S_ISREG(inode->i_mode) && lli->lli_clob)
                /* discard all dirty pages before truncating them, required by
                 * osc_extent implementation at LU-1030.
                 */
                cl_sync_file_range(inode, 0, OBD_OBJECT_EOF,
                                   CL_FSYNC_DISCARD, 1);

        truncate_inode_pages_final(&inode->i_data);

        /* Workaround for LU-118 */
        if (inode->i_data.nrpages) {
                spin_lock_irq(&inode->i_data.tree_lock);
                spin_unlock_irq(&inode->i_data.tree_lock);
                LASSERTF(inode->i_data.nrpages == 0,
                         "inode=%lu/%u(%p) nrpages=%lu, see http://jira.whamcloud.com/browse/LU-118\n",
                         inode->i_ino, inode->i_generation, inode,
                         inode->i_data.nrpages);
        }
        /* Workaround end */

        ll_clear_inode(inode);
        clear_inode(inode);
}

int ll_iocontrol(struct inode *inode, struct file *file,
                 unsigned int cmd, unsigned long arg)
{
        struct ll_sb_info *sbi = ll_i2sbi(inode);
        struct ptlrpc_request *req = NULL;
        int rc, flags = 0;

        switch (cmd) {
        case FSFILT_IOC_GETFLAGS: {
                struct mdt_body *body;
                struct md_op_data *op_data;

                op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL,
                                             0, 0, LUSTRE_OPC_ANY,
                                             NULL);
                if (IS_ERR(op_data))
                        return PTR_ERR(op_data);

                op_data->op_valid = OBD_MD_FLFLAGS;
                rc = md_getattr(sbi->ll_md_exp, op_data, &req);
                ll_finish_md_op_data(op_data);
                if (rc) {
                        CERROR("failure %d inode %lu\n", rc, inode->i_ino);
                        return -abs(rc);
                }

                body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);

                flags = body->flags;

                ptlrpc_req_finished(req);

                return put_user(flags, (int __user *)arg);
        }
        case FSFILT_IOC_SETFLAGS: {
                struct lov_stripe_md *lsm;
                struct obd_info oinfo = { };
                struct md_op_data *op_data;

                if (get_user(flags, (int __user *)arg))
                        return -EFAULT;

                op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
                                             LUSTRE_OPC_ANY, NULL);
                if (IS_ERR(op_data))
                        return PTR_ERR(op_data);

                ((struct ll_iattr *)&op_data->op_attr)->ia_attr_flags = flags;
                op_data->op_attr.ia_valid |= ATTR_ATTR_FLAG;
                rc = md_setattr(sbi->ll_md_exp, op_data,
                                NULL, 0, NULL, 0, &req, NULL);
                ll_finish_md_op_data(op_data);
                ptlrpc_req_finished(req);
                if (rc)
                        return rc;

                inode->i_flags = ll_ext_to_inode_flags(flags);

                lsm = ccc_inode_lsm_get(inode);
                if (!lsm_has_objects(lsm)) {
                        ccc_inode_lsm_put(inode, lsm);
                        return 0;
                }

                oinfo.oi_oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
                if (!oinfo.oi_oa) {
                        ccc_inode_lsm_put(inode, lsm);
                        return -ENOMEM;
                }
                oinfo.oi_md = lsm;
                oinfo.oi_oa->o_oi = lsm->lsm_oi;
                oinfo.oi_oa->o_flags = flags;
                oinfo.oi_oa->o_valid = OBD_MD_FLID | OBD_MD_FLFLAGS |
                                       OBD_MD_FLGROUP;
                obdo_set_parent_fid(oinfo.oi_oa, &ll_i2info(inode)->lli_fid);
                rc = obd_setattr_rqset(sbi->ll_dt_exp, &oinfo, NULL);
                kmem_cache_free(obdo_cachep, oinfo.oi_oa);
                ccc_inode_lsm_put(inode, lsm);

                if (rc && rc != -EPERM && rc != -EACCES)
                        CERROR("osc_setattr_async fails: rc = %d\n", rc);

                return rc;
        }
        default:
                return -ENOSYS;
        }

        return 0;
}

int ll_flush_ctx(struct inode *inode)
{
        struct ll_sb_info  *sbi = ll_i2sbi(inode);

        CDEBUG(D_SEC, "flush context for user %d\n",
               from_kuid(&init_user_ns, current_uid()));

        obd_set_info_async(NULL, sbi->ll_md_exp,
                           sizeof(KEY_FLUSH_CTX), KEY_FLUSH_CTX,
                           0, NULL, NULL);
        obd_set_info_async(NULL, sbi->ll_dt_exp,
                           sizeof(KEY_FLUSH_CTX), KEY_FLUSH_CTX,
                           0, NULL, NULL);
        return 0;
}

/* umount -f client means force down, don't save state */
void ll_umount_begin(struct super_block *sb)
{
        struct ll_sb_info *sbi = ll_s2sbi(sb);
        struct obd_device *obd;
        struct obd_ioctl_data *ioc_data;

        CDEBUG(D_VFSTRACE, "VFS Op: superblock %p count %d active %d\n", sb,
               sb->s_count, atomic_read(&sb->s_active));

        obd = class_exp2obd(sbi->ll_md_exp);
        if (!obd) {
                CERROR("Invalid MDC connection handle %#llx\n",
                       sbi->ll_md_exp->exp_handle.h_cookie);
                return;
        }
        obd->obd_force = 1;

        obd = class_exp2obd(sbi->ll_dt_exp);
        if (!obd) {
                CERROR("Invalid LOV connection handle %#llx\n",
                       sbi->ll_dt_exp->exp_handle.h_cookie);
                return;
        }
        obd->obd_force = 1;

        ioc_data = kzalloc(sizeof(*ioc_data), GFP_NOFS);
        if (ioc_data) {
                obd_iocontrol(IOC_OSC_SET_ACTIVE, sbi->ll_md_exp,
                              sizeof(*ioc_data), ioc_data, NULL);

                obd_iocontrol(IOC_OSC_SET_ACTIVE, sbi->ll_dt_exp,
                              sizeof(*ioc_data), ioc_data, NULL);

                kfree(ioc_data);
        }

        /* Really, we'd like to wait until there are no requests outstanding,
         * and then continue.  For now, we just invalidate the requests,
         * schedule() and sleep one second if needed, and hope.
         */
        schedule();
}

int ll_remount_fs(struct super_block *sb, int *flags, char *data)
{
        struct ll_sb_info *sbi = ll_s2sbi(sb);
        char *profilenm = get_profile_name(sb);
        int err;
        __u32 read_only;

        if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
                read_only = *flags & MS_RDONLY;
                err = obd_set_info_async(NULL, sbi->ll_md_exp,
                                         sizeof(KEY_READ_ONLY),
                                         KEY_READ_ONLY, sizeof(read_only),
                                         &read_only, NULL);
                if (err) {
                        LCONSOLE_WARN("Failed to remount %s %s (%d)\n",
                                      profilenm, read_only ?
                                      "read-only" : "read-write", err);
                        return err;
                }

                if (read_only)
                        sb->s_flags |= MS_RDONLY;
                else
                        sb->s_flags &= ~MS_RDONLY;

                if (sbi->ll_flags & LL_SBI_VERBOSE)
                        LCONSOLE_WARN("Remounted %s %s\n", profilenm,
                                      read_only ?  "read-only" : "read-write");
        }
        return 0;
}

/**
 * Cleanup the open handle that is cached on MDT-side.
 *
 * For open case, the client side open handling thread may hit error
 * after the MDT grant the open. Under such case, the client should
 * send close RPC to the MDT as cleanup; otherwise, the open handle
 * on the MDT will be leaked there until the client umount or evicted.
 *
 * In further, if someone unlinked the file, because the open handle
 * holds the reference on such file/object, then it will block the
 * subsequent threads that want to locate such object via FID.
 *
 * \param[in] sb        super block for this file-system
 * \param[in] open_req  pointer to the original open request
 */
void ll_open_cleanup(struct super_block *sb, struct ptlrpc_request *open_req)
{
        struct mdt_body                 *body;
        struct md_op_data               *op_data;
        struct ptlrpc_request           *close_req = NULL;
        struct obd_export               *exp       = ll_s2sbi(sb)->ll_md_exp;

        body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
        op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
        if (!op_data)
                return;

        op_data->op_fid1 = body->fid1;
        op_data->op_ioepoch = body->ioepoch;
        op_data->op_handle = body->handle;
        op_data->op_mod_time = get_seconds();
        md_close(exp, op_data, NULL, &close_req);
        ptlrpc_req_finished(close_req);
        ll_finish_md_op_data(op_data);
}

int ll_prep_inode(struct inode **inode, struct ptlrpc_request *req,
                  struct super_block *sb, struct lookup_intent *it)
{
        struct ll_sb_info *sbi = NULL;
        struct lustre_md md = { NULL };
        int rc;

        LASSERT(*inode || sb);
        sbi = sb ? ll_s2sbi(sb) : ll_i2sbi(*inode);
        rc = md_get_lustre_md(sbi->ll_md_exp, req, sbi->ll_dt_exp,
                              sbi->ll_md_exp, &md);
        if (rc)
                goto cleanup;

        if (*inode) {
                ll_update_inode(*inode, &md);
        } else {
                LASSERT(sb);

                /*
                 * At this point server returns to client's same fid as client
                 * generated for creating. So using ->fid1 is okay here.
                 */
                LASSERT(fid_is_sane(&md.body->fid1));

                *inode = ll_iget(sb, cl_fid_build_ino(&md.body->fid1,
                                             sbi->ll_flags & LL_SBI_32BIT_API),
                                 &md);
                if (!*inode) {
#ifdef CONFIG_FS_POSIX_ACL
                        if (md.posix_acl) {
                                posix_acl_release(md.posix_acl);
                                md.posix_acl = NULL;
                        }
#endif
                        rc = -ENOMEM;
                        CERROR("new_inode -fatal: rc %d\n", rc);
                        goto out;
                }
        }

        /* Handling piggyback layout lock.
         * Layout lock can be piggybacked by getattr and open request.
         * The lsm can be applied to inode only if it comes with a layout lock
         * otherwise correct layout may be overwritten, for example:
         * 1. proc1: mdt returns a lsm but not granting layout
         * 2. layout was changed by another client
         * 3. proc2: refresh layout and layout lock granted
         * 4. proc1: to apply a stale layout
         */
        if (it && it->d.lustre.it_lock_mode != 0) {
                struct lustre_handle lockh;
                struct ldlm_lock *lock;

                lockh.cookie = it->d.lustre.it_lock_handle;
                lock = ldlm_handle2lock(&lockh);
                LASSERT(lock);
                if (ldlm_has_layout(lock)) {
                        struct cl_object_conf conf;

                        memset(&conf, 0, sizeof(conf));
                        conf.coc_opc = OBJECT_CONF_SET;
                        conf.coc_inode = *inode;
                        conf.coc_lock = lock;
                        conf.u.coc_md = &md;
                        (void)ll_layout_conf(*inode, &conf);
                }
                LDLM_LOCK_PUT(lock);
        }

out:
        if (md.lsm)
                obd_free_memmd(sbi->ll_dt_exp, &md.lsm);
        md_free_lustre_md(sbi->ll_md_exp, &md);

cleanup:
        if (rc != 0 && it && it->it_op & IT_OPEN)
                ll_open_cleanup(sb ? sb : (*inode)->i_sb, req);

        return rc;
}

int ll_obd_statfs(struct inode *inode, void __user *arg)
{
        struct ll_sb_info *sbi = NULL;
        struct obd_export *exp;
        char *buf = NULL;
        struct obd_ioctl_data *data = NULL;
        __u32 type;
        int len = 0, rc;

        if (!inode) {
                rc = -EINVAL;
                goto out_statfs;
        }

        sbi = ll_i2sbi(inode);
        if (!sbi) {
                rc = -EINVAL;
                goto out_statfs;
        }

        rc = obd_ioctl_getdata(&buf, &len, arg);
        if (rc)
                goto out_statfs;

        data = (void *)buf;
        if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2 ||
            !data->ioc_pbuf1 || !data->ioc_pbuf2) {
                rc = -EINVAL;
                goto out_statfs;
        }

        if (data->ioc_inllen1 != sizeof(__u32) ||
            data->ioc_inllen2 != sizeof(__u32) ||
            data->ioc_plen1 != sizeof(struct obd_statfs) ||
            data->ioc_plen2 != sizeof(struct obd_uuid)) {
                rc = -EINVAL;
                goto out_statfs;
        }

        memcpy(&type, data->ioc_inlbuf1, sizeof(__u32));
        if (type & LL_STATFS_LMV)
                exp = sbi->ll_md_exp;
        else if (type & LL_STATFS_LOV)
                exp = sbi->ll_dt_exp;
        else {
                rc = -ENODEV;
                goto out_statfs;
        }

        rc = obd_iocontrol(IOC_OBD_STATFS, exp, len, buf, NULL);
        if (rc)
                goto out_statfs;
out_statfs:
        if (buf)
                obd_ioctl_freedata(buf, len);
        return rc;
}

int ll_process_config(struct lustre_cfg *lcfg)
{
        char *ptr;
        void *sb;
        struct lprocfs_static_vars lvars;
        unsigned long x;
        int rc = 0;

        lprocfs_llite_init_vars(&lvars);

        /* The instance name contains the sb: lustre-client-aacfe000 */
        ptr = strrchr(lustre_cfg_string(lcfg, 0), '-');
        if (!ptr || !*(++ptr))
                return -EINVAL;
        rc = kstrtoul(ptr, 16, &x);
        if (rc != 0)
                return -EINVAL;
        sb = (void *)x;
        /* This better be a real Lustre superblock! */
        LASSERT(s2lsi((struct super_block *)sb)->lsi_lmd->lmd_magic == LMD_MAGIC);

        /* Note we have not called client_common_fill_super yet, so
         * proc fns must be able to handle that!
         */
        rc = class_process_proc_param(PARAM_LLITE, lvars.obd_vars,
                                      lcfg, sb);
        if (rc > 0)
                rc = 0;
        return rc;
}

/* this function prepares md_op_data hint for passing ot down to MD stack. */
struct md_op_data *ll_prep_md_op_data(struct md_op_data *op_data,
                                      struct inode *i1, struct inode *i2,
                                      const char *name, int namelen,
                                      int mode, __u32 opc, void *data)
{
        if (namelen > ll_i2sbi(i1)->ll_namelen)
                return ERR_PTR(-ENAMETOOLONG);

        if (!op_data)
                op_data = kzalloc(sizeof(*op_data), GFP_NOFS);

        if (!op_data)
                return ERR_PTR(-ENOMEM);

        ll_i2gids(op_data->op_suppgids, i1, i2);
        op_data->op_fid1 = *ll_inode2fid(i1);

        if (i2)
                op_data->op_fid2 = *ll_inode2fid(i2);
        else
                fid_zero(&op_data->op_fid2);

        op_data->op_name = name;
        op_data->op_namelen = namelen;
        op_data->op_mode = mode;
        op_data->op_mod_time = ktime_get_real_seconds();
        op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
        op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
        op_data->op_cap = cfs_curproc_cap_pack();
        op_data->op_bias = 0;
        op_data->op_cli_flags = 0;
        if ((opc == LUSTRE_OPC_CREATE) && name &&
            filename_is_volatile(name, namelen, NULL))
                op_data->op_bias |= MDS_CREATE_VOLATILE;
        op_data->op_opc = opc;
        op_data->op_mds = 0;
        op_data->op_data = data;

        /* If the file is being opened after mknod() (normally due to NFS)
         * try to use the default stripe data from parent directory for
         * allocating OST objects.  Try to pass the parent FID to MDS.
         */
        if (opc == LUSTRE_OPC_CREATE && i1 == i2 && S_ISREG(i2->i_mode) &&
            !ll_i2info(i2)->lli_has_smd) {
                struct ll_inode_info *lli = ll_i2info(i2);

                spin_lock(&lli->lli_lock);
                if (likely(!lli->lli_has_smd && !fid_is_zero(&lli->lli_pfid)))
                        op_data->op_fid1 = lli->lli_pfid;
                spin_unlock(&lli->lli_lock);
        }

        /* When called by ll_setattr_raw, file is i1. */
        if (ll_i2info(i1)->lli_flags & LLIF_DATA_MODIFIED)
                op_data->op_bias |= MDS_DATA_MODIFIED;

        return op_data;
}

void ll_finish_md_op_data(struct md_op_data *op_data)
{
        kfree(op_data);
}

int ll_show_options(struct seq_file *seq, struct dentry *dentry)
{
        struct ll_sb_info *sbi;

        LASSERT(seq && dentry);
        sbi = ll_s2sbi(dentry->d_sb);

        if (sbi->ll_flags & LL_SBI_NOLCK)
                seq_puts(seq, ",nolock");

        if (sbi->ll_flags & LL_SBI_FLOCK)
                seq_puts(seq, ",flock");

        if (sbi->ll_flags & LL_SBI_LOCALFLOCK)
                seq_puts(seq, ",localflock");

        if (sbi->ll_flags & LL_SBI_USER_XATTR)
                seq_puts(seq, ",user_xattr");

        if (sbi->ll_flags & LL_SBI_LAZYSTATFS)
                seq_puts(seq, ",lazystatfs");

        if (sbi->ll_flags & LL_SBI_USER_FID2PATH)
                seq_puts(seq, ",user_fid2path");

        return 0;
}

/**
 * Get obd name by cmd, and copy out to user space
 */
int ll_get_obd_name(struct inode *inode, unsigned int cmd, unsigned long arg)
{
        struct ll_sb_info *sbi = ll_i2sbi(inode);
        struct obd_device *obd;

        if (cmd == OBD_IOC_GETDTNAME)
                obd = class_exp2obd(sbi->ll_dt_exp);
        else if (cmd == OBD_IOC_GETMDNAME)
                obd = class_exp2obd(sbi->ll_md_exp);
        else
                return -EINVAL;

        if (!obd)
                return -ENOENT;

        if (copy_to_user((void __user *)arg, obd->obd_name,
                         strlen(obd->obd_name) + 1))
                return -EFAULT;

        return 0;
}

/**
 * Get lustre file system name by \a sbi. If \a buf is provided(non-NULL), the
 * fsname will be returned in this buffer; otherwise, a static buffer will be
 * used to store the fsname and returned to caller.
 */
char *ll_get_fsname(struct super_block *sb, char *buf, int buflen)
{
        static char fsname_static[MTI_NAME_MAXLEN];
        struct lustre_sb_info *lsi = s2lsi(sb);
        char *ptr;
        int len;

        if (!buf) {
                /* this means the caller wants to use static buffer
                 * and it doesn't care about race. Usually this is
                 * in error reporting path
                 */
                buf = fsname_static;
                buflen = sizeof(fsname_static);
        }

        len = strlen(lsi->lsi_lmd->lmd_profile);
        ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
        if (ptr && (strcmp(ptr, "-client") == 0))
                len -= 7;

        if (unlikely(len >= buflen))
                len = buflen - 1;
        strncpy(buf, lsi->lsi_lmd->lmd_profile, len);
        buf[len] = '\0';

        return buf;
}

void ll_dirty_page_discard_warn(struct page *page, int ioret)
{
        char *buf, *path = NULL;
        struct dentry *dentry = NULL;
        struct ccc_object *obj = cl_inode2ccc(page->mapping->host);

        /* this can be called inside spin lock so use GFP_ATOMIC. */
        buf = (char *)__get_free_page(GFP_ATOMIC);
        if (buf) {
                dentry = d_find_alias(page->mapping->host);
                if (dentry)
                        path = dentry_path_raw(dentry, buf, PAGE_SIZE);
        }

        CDEBUG(D_WARNING,
               "%s: dirty page discard: %s/fid: " DFID "/%s may get corrupted (rc %d)\n",
               ll_get_fsname(page->mapping->host->i_sb, NULL, 0),
               s2lsi(page->mapping->host->i_sb)->lsi_lmd->lmd_dev,
               PFID(&obj->cob_header.coh_lu.loh_fid),
               (path && !IS_ERR(path)) ? path : "", ioret);

        if (dentry)
                dput(dentry);

        if (buf)
                free_page((unsigned long)buf);
}