text: /*
   * 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, 2012, 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/types.h>
  #include <linux/mm.h>
  
  #include <lustre_lite.h>
  #include <lustre_ha.h>
  #include <lustre_dlm.h>
  #include <lprocfs_status.h>
  #include <lustre_disk.h>
  #include <lustre_param.h>
  #include <lustre_log.h>
  #include <cl_object.h>
  #include <obd_cksum.h>
  #include "llite_internal.h"
  
  struct kmem_cache *ll_file_data_slab;
  
  LIST_HEAD(ll_super_blocks);
  DEFINE_SPINLOCK(ll_sb_lock);
  
  #ifndef MS_HAS_NEW_AOPS
  extern struct address_space_operations ll_aops;
  #else
  extern struct address_space_operations_ext ll_aops;
  #endif
  
  #ifndef log2
  #define log2(n) ffz(~(n))
  #endif
  
  static struct ll_sb_info *ll_init_sbi(void)
  {
  	struct ll_sb_info *sbi = NULL;
  	unsigned long pages;
  	unsigned long lru_page_max;
  	struct sysinfo si;
  	class_uuid_t uuid;
  	int i;
  
  	OBD_ALLOC(sbi, sizeof(*sbi));
  	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_CACHE_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;
  	INIT_LIST_HEAD(&sbi->ll_conn_chain);
  	INIT_LIST_HEAD(&sbi->ll_orphan_dentry_list);
  
  	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);
  
  	spin_lock(&ll_sb_lock);
  	list_add_tail(&sbi->ll_list, &ll_super_blocks);
  	spin_unlock(&ll_sb_lock);
  
  	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;
  
  	return sbi;
  }
  
  void ll_free_sbi(struct super_block *sb)
  {
  	struct ll_sb_info *sbi = ll_s2sbi(sb);
  
  	if (sbi != NULL) {
  		spin_lock(&ll_sb_lock);
  		list_del(&sbi->ll_list);
  		spin_unlock(&ll_sb_lock);
  		OBD_FREE(sbi, sizeof(*sbi));
  	}
  }
  
  static struct dentry_operations ll_d_root_ops = {
  	.d_compare = ll_dcompare,
  	.d_revalidate = ll_revalidate_nd,
  };
  
  static int client_common_fill_super(struct super_block *sb, char *md, char *dt,
  				    struct vfsmount *mnt)
  {
  	struct inode *root = 0;
  	struct ll_sb_info *sbi = ll_s2sbi(sb);
  	struct obd_device *obd;
  	struct obd_capa *oc = NULL;
  	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;
  	obd_valid valid;
  	int size, err, checksum;
  
  	obd = class_name2obd(md);
  	if (!obd) {
  		CERROR("MD %s: not setup or attached\n", md);
  		return -EINVAL;
  	}
  
  	OBD_ALLOC_PTR(data);
  	if (data == NULL)
  		return -ENOMEM;
  
  	OBD_ALLOC_PTR(osfs);
  	if (osfs == NULL) {
  		OBD_FREE_PTR(data);
  		return -ENOMEM;
  	}
  
  	if (proc_lustre_fs_root) {
  		err = lprocfs_register_mountpoint(proc_lustre_fs_root, sb,
  						  dt, md);
  		if (err < 0)
  			CERROR("could not register mount in /proc/fs/lustre\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_MDS_CAPA | OBD_CONNECT_OSS_CAPA |
  				  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;
  
  	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;
  
  #ifdef HAVE_MS_FLOCK_LOCK
  	/* force vfs to use lustre handler for flock() calls - bug 10743 */
  	sb->s_flags |= MS_FLOCK_LOCK;
  #endif
  #ifdef MS_HAS_NEW_AOPS
  	sb->s_flags |= MS_HAS_NEW_AOPS;
  #endif
  
  	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, err);
  	} else if (err) {
  		CERROR("cannot connect to %s: rc = %d\n", md, err);
  		GOTO(out, err);
  	}
  
  	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, err);
  	}
  
  	/* 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
  	 * avaible */
  	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, err);
  
  	/* 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;
  
  		OBD_ALLOC_WAIT(buf, PAGE_CACHE_SIZE);
  		obd_connect_flags2str(buf, PAGE_CACHE_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);
  		OBD_FREE(buf, PAGE_CACHE_SIZE);
  		GOTO(out_md_fid, err = -EPROTO);
  	}
  
  	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, err);
  	}
  
  	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;
  	sbi->ll_max_rw_chunk = LL_DEFAULT_MAX_RW_CHUNK;
  
  	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) {
  #ifdef MS_POSIXACL
  		sb->s_flags |= MS_POSIXACL;
  #endif
  		sbi->ll_flags |= LL_SBI_ACL;
  	} else {
  		LCONSOLE_INFO("client wants to enable acl, but mdt not!\n");
  #ifdef MS_POSIXACL
  		sb->s_flags &= ~MS_POSIXACL;
  #endif
  		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_MDS_CAPA) {
  		LCONSOLE_INFO("client enabled MDS capability!\n");
  		sbi->ll_flags |= LL_SBI_MDS_CAPA;
  	}
  
  	if (data->ocd_connect_flags & OBD_CONNECT_OSS_CAPA) {
  		LCONSOLE_INFO("client enabled OSS capability!\n");
  		sbi->ll_flags |= LL_SBI_OSS_CAPA;
  	}
  
  	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_CACHE_SIZE;
  
  	if (data->ocd_connect_flags & OBD_CONNECT_LAYOUTLOCK) {
  		LCONSOLE_INFO("Layout lock feature supported.\n");
  		sbi->ll_flags |= LL_SBI_LAYOUT_LOCK;
  	}
  
  	obd = class_name2obd(dt);
  	if (!obd) {
  		CERROR("DT %s: not setup or attached\n", dt);
  		GOTO(out_md_fid, err = -ENODEV);
  	}
  
  	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 /proc. 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: "LPX64" 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, err);
  	} 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, err);
  	}
  
  	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, err);
  	}
  
  	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, &oc);
  	if (err) {
  		CERROR("cannot mds_connect: rc = %d\n", err);
  		GOTO(out_lock_cn_cb, err);
  	}
  	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));
  		GOTO(out_lock_cn_cb, err = -EINVAL);
  	}
  	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 | OBD_MD_FLMDSCAPA;
  	if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
  		valid |= OBD_MD_FLRMTPERM;
  	else if (sbi->ll_flags & LL_SBI_ACL)
  		valid |= OBD_MD_FLACL;
  
  	OBD_ALLOC_PTR(op_data);
  	if (op_data == NULL)
  		GOTO(out_lock_cn_cb, err = -ENOMEM);
  
  	op_data->op_fid1 = sbi->ll_root_fid;
  	op_data->op_mode = 0;
  	op_data->op_capa1 = oc;
  	op_data->op_valid = valid;
  
  	err = md_getattr(sbi->ll_md_exp, op_data, &request);
  	if (oc)
  		capa_put(oc);
  	OBD_FREE_PTR(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);
  	}
  
  	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, err);
  	}
  
  	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 == NULL || IS_ERR(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 = IS_ERR(root) ? PTR_ERR(root) : -EBADF;
  		root = NULL;
  		CERROR("lustre_lite: bad iget4 for root\n");
  		GOTO(out_root, err);
  	}
  
  	err = ll_close_thread_start(&sbi->ll_lcq);
  	if (err) {
  		CERROR("cannot start close thread: rc %d\n", err);
  		GOTO(out_root, err);
  	}
  
  #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 == NULL) {
  		CERROR("%s: can't make root dentry\n",
  			ll_get_fsname(sb, NULL, 0));
  		GOTO(out_root, err = -ENOMEM);
  	}
  
  	/* kernel >= 2.6.38 store dentry operations in sb->s_d_op. */
  	d_set_d_op(sb->s_root, &ll_d_root_ops);
  	sb->s_d_op = &ll_d_ops;
  
  	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 != NULL) {
  		sb->s_dev = get_uuid2int(uuid->uuid, strlen(uuid->uuid));
  		get_uuid2fsid(uuid->uuid, strlen(uuid->uuid), &sbi->ll_fsid);
  	}
  
  	if (data != NULL)
  		OBD_FREE_PTR(data);
  	if (osfs != NULL)
  		OBD_FREE_PTR(osfs);
  
  	return err;
  out_root:
  	if (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:
  	if (data != NULL)
  		OBD_FREE_PTR(data);
  	if (osfs != NULL)
  		OBD_FREE_PTR(osfs);
  	lprocfs_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;
  }
  
  void ll_dump_inode(struct inode *inode)
  {
  	struct ll_d_hlist_node *tmp;
  	int dentry_count = 0;
  
  	LASSERT(inode != NULL);
  
  	ll_d_hlist_for_each(tmp, &inode->i_dentry)
  		dentry_count++;
  
  	CERROR("inode %p dump: dev=%s ino=%lu mode=%o count=%u, %d dentries\n",
  	       inode, ll_i2mdexp(inode)->exp_obd->obd_name, inode->i_ino,
  	       inode->i_mode, atomic_read(&inode->i_count), dentry_count);
  }
  
  void lustre_dump_dentry(struct dentry *dentry, int recur)
  {
  	struct list_head *tmp;
  	int subdirs = 0;
  
  	LASSERT(dentry != NULL);
  
  	list_for_each(tmp, &dentry->d_subdirs)
  		subdirs++;
  
  	CERROR("dentry %p dump: name=%.*s parent=%.*s (%p), inode=%p, count=%u,"
  	       " flags=0x%x, fsdata=%p, %d subdirs\n", dentry,
  	       dentry->d_name.len, dentry->d_name.name,
  	       dentry->d_parent->d_name.len, dentry->d_parent->d_name.name,
  	       dentry->d_parent, dentry->d_inode, d_count(dentry),
  	       dentry->d_flags, dentry->d_fsdata, subdirs);
  	if (dentry->d_inode != NULL)
  		ll_dump_inode(dentry->d_inode);
  
  	if (recur == 0)
  		return;
  
  	list_for_each(tmp, &dentry->d_subdirs) {
  		struct dentry *d = list_entry(tmp, struct dentry, d_child);
  		lustre_dump_dentry(d, recur - 1);
  	}
  }
  
  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);
  
  	list_del(&sbi->ll_conn_chain);
  
  	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();
  
  	lprocfs_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 restore s_dev from changed for clustred 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;
  	}
  }
  
  char *ll_read_opt(const char *opt, char *data)
  {
  	char *value;
  	char *retval;
  
  	CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  	if (strncmp(opt, data, strlen(opt)))
  		return NULL;
  	if ((value = strchr(data, '=')) == NULL)
  		return NULL;
  
  	value++;
  	OBD_ALLOC(retval, strlen(value) + 1);
  	if (!retval) {
  		CERROR("out of memory!\n");
  		return NULL;
  	}
  
  	memcpy(retval, value, strlen(value)+1);
  	CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  	return retval;
  }
  
  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;
  		}
  #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 5, 50, 0)
  		tmp = ll_set_opt("acl", s1, LL_SBI_ACL);
  		if (tmp) {
  			/* Ignore deprecated mount option.  The client will
  			 * always try to mount with ACL support, whether this
  			 * is used depends on whether server supports it. */
  			LCONSOLE_ERROR_MSG(0x152, "Ignoring deprecated "
  						  "mount option 'acl'.\n");
  			goto next;
  		}
  		tmp = ll_set_opt("noacl", s1, LL_SBI_ACL);
  		if (tmp) {
  			LCONSOLE_ERROR_MSG(0x152, "Ignoring deprecated "
  						  "mount option 'noacl'.\n");
  			goto next;
  		}
  #else
  #warning "{no}acl options have been deprecated since 1.8, please remove them"
  #endif
  		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 == NULL)
  			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);
  	INIT_LIST_HEAD(&lli->lli_oss_capas);
  	atomic_set(&lli->lli_open_count, 0);
  	lli->lli_mds_capa = NULL;
  	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;
  	lli->lli_layout_gen = LL_LAYOUT_GEN_NONE;
  	lli->lli_clob = NULL;
  
  	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;
  		lli->lli_def_acl = NULL;
  		spin_lock_init(&lli->lli_sa_lock);
  		lli->lli_opendir_pid = 0;
  	} else {
  		sema_init(&lli->lli_size_sem, 1);
  		lli->lli_size_sem_owner = NULL;
  		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;
  		lli->lli_volatile = false;
  	}
  	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;
  	/* %p for void* in printf needs 16+2 characters: 0xffffffffffffffff */
  	const int instlen = sizeof(cfg->cfg_instance) * 2 + 2;
  	int    err;
  
  	CDEBUG(D_VFSTRACE, "VFS Op: sb %p\n", sb);
  
  	OBD_ALLOC_PTR(cfg);
  	if (cfg == NULL)
  		return -ENOMEM;
  
  	try_module_get(THIS_MODULE);
  
  	/* client additional sb info */
  	lsi->lsi_llsbi = sbi = ll_init_sbi();
  	if (!sbi) {
  		module_put(THIS_MODULE);
  		OBD_FREE_PTR(cfg);
  		return -ENOMEM;
  	}
  
  	err = ll_options(lsi->lsi_lmd->lmd_opts, &sbi->ll_flags);
  	if (err)
  		GOTO(out_free, err);
  
  	err = bdi_init(&lsi->lsi_bdi);
  	if (err)
  		GOTO(out_free, err);
  	lsi->lsi_flags |= LSI_BDI_INITIALIZED;
  	lsi->lsi_bdi.capabilities = BDI_CAP_MAP_COPY;
  	err = ll_bdi_register(&lsi->lsi_bdi);
  	if (err)
  		GOTO(out_free, err);
  
  	sb->s_bdi = &lsi->lsi_bdi;
  
  	/* 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, err);
  	}
  
  	/* Profile set with LCFG_MOUNTOPT so we can find our mdc and osc obds */
  	lprof = class_get_profile(profilenm);
  	if (lprof == NULL) {
  		LCONSOLE_ERROR_MSG(0x156, "The client profile '%s' could not be"
  				   " read from the MGS.  Does that filesystem "
  				   "exist?\n", profilenm);
  		GOTO(out_free, err = -EINVAL);
  	}
  	CDEBUG(D_CONFIG, "Found profile %s: mdc=%s osc=%s\n", profilenm,
  	       lprof->lp_md, lprof->lp_dt);
  
  	OBD_ALLOC(dt, strlen(lprof->lp_dt) + instlen + 2);
  	if (!dt)
  		GOTO(out_free, err = -ENOMEM);
  	sprintf(dt, "%s-%p", lprof->lp_dt, cfg->cfg_instance);
  
  	OBD_ALLOC(md, strlen(lprof->lp_md) + instlen + 2);
  	if (!md)
  		GOTO(out_free, err = -ENOMEM);
  	sprintf(md, "%s-%p", lprof->lp_md, cfg->cfg_instance);
  
  	/* connections, registrations, sb setup */
  	err = client_common_fill_super(sb, md, dt, mnt);
  
  out_free:
  	if (md)
  		OBD_FREE(md, strlen(lprof->lp_md) + instlen + 2);
  	if (dt)
  		OBD_FREE(dt, strlen(lprof->lp_dt) + instlen + 2);
  	if (err)
  		ll_put_super(sb);
  	else if (sbi->ll_flags & LL_SBI_VERBOSE)
  		LCONSOLE_WARN("Mounted %s\n", profilenm);
  
  	OBD_FREE_PTR(cfg);
  	return err;
  } /* ll_fill_super */
  
  void ll_put_super(struct super_block *sb)
  {
  	struct config_llog_instance 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);
  
  	ll_print_capa_stat(sbi);
  
  	cfg.cfg_instance = sb;
  	lustre_end_log(sb, profilenm, &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)) !=NULL) {
  		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;
  }
  
  struct inode *ll_inode_from_lock(struct ldlm_lock *lock)
  {
  	struct inode *inode = NULL;
  	/* NOTE: we depend on atomic igrab() -bzzz */
  	lock_res_and_lock(lock);
  	if (lock->l_ast_data) {
  		struct ll_inode_info *lli = ll_i2info(lock->l_ast_data);
  		if (lli->lli_inode_magic == LLI_INODE_MAGIC) {
  			inode = igrab(lock->l_ast_data);
  		} else {
  			inode = lock->l_ast_data;
  			LDLM_DEBUG_LIMIT(inode->i_state & I_FREEING ?  D_INFO :
  					 D_WARNING, lock, "l_ast_data %p is "
  					 "bogus: magic %08x", lock->l_ast_data,
  					 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 == NULL);
  		LASSERT(lli->lli_sai == NULL);
  		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) && lli->lli_symlink_name) {
  		OBD_FREE(lli->lli_symlink_name,
  			 strlen(lli->lli_symlink_name) + 1);
  		lli->lli_symlink_name = NULL;
  	}
  
  	if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
  		LASSERT(lli->lli_posix_acl == NULL);
  		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 == NULL);
  		posix_acl_release(lli->lli_posix_acl);
  		lli->lli_posix_acl = NULL;
  	}
  #endif
  	lli->lli_inode_magic = LLI_INODE_DEAD;
  
  	ll_clear_inode_capas(inode);
  	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;
  }
  
  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 = dentry->d_inode;
  	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 done 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 ll_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;
  
  	LASSERT(op_data != NULL);
  	if (!S_ISREG(inode->i_mode))
  		return 0;
  
  	CDEBUG(D_INODE, "Epoch "LPU64" 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;
  }
  
  static int ll_setattr_ost(struct inode *inode, struct iattr *attr)
  {
  	struct obd_capa *capa;
  	int rc;
  
  	if (attr->ia_valid & ATTR_SIZE)
  		capa = ll_osscapa_get(inode, CAPA_OPC_OSS_TRUNC);
  	else
  		capa = ll_mdscapa_get(inode);
  
  	rc = cl_setattr_ost(inode, attr, capa);
  
  	if (attr->ia_valid & ATTR_SIZE)
  		ll_truncate_free_capa(capa);
  	else
  		capa_put(capa);
  
  	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.
   */
  int ll_setattr_raw(struct dentry *dentry, struct iattr *attr)
  {
  	struct inode *inode = dentry->d_inode;
  	struct ll_inode_info *lli = ll_i2info(inode);
  	struct md_op_data *op_data = NULL;
  	struct md_open_data *mod = NULL;
  	int rc = 0, rc1 = 0;
  
  	CDEBUG(D_VFSTRACE, "%s: setattr inode %p/fid:"DFID" from %llu to %llu, "
  		"valid %x\n", ll_get_fsname(inode->i_sb, NULL, 0), inode,
  		PFID(&lli->lli_fid), i_size_read(inode), attr->ia_size,
  		attr->ia_valid);
  
  	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 > "LPU64"\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)) &&
  		    !cfs_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 = %lu\n",
  		       LTIME_S(attr->ia_mtime), LTIME_S(attr->ia_ctime),
  		       cfs_time_current_sec());
  
  	/* 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 */
  
  	OBD_ALLOC_PTR(op_data);
  	if (op_data == NULL)
  		return -ENOMEM;
  
  	if (!S_ISDIR(inode->i_mode)) {
  		if (attr->ia_valid & ATTR_SIZE)
  			inode_dio_write_done(inode);
  		mutex_unlock(&inode->i_mutex);
  		down_write(&lli->lli_trunc_sem);
  	}
  
  	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;
  
  	rc = ll_md_setattr(dentry, op_data, &mod);
  	if (rc)
  		GOTO(out, rc);
  
  	/* RPC to MDT is sent, cancel data modification flag */
  	if (rc == 0 && (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))
  		GOTO(out, rc = 0);
  
  	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 */
  		rc = ll_setattr_ost(inode, attr);
  out:
  	if (op_data) {
  		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)) {
  		up_write(&lli->lli_trunc_sem);
  		mutex_lock(&inode->i_mutex);
  		if (attr->ia_valid & ATTR_SIZE)
  			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 = de->d_inode->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 ((mode & S_ISUID) &&
  	    !(attr->ia_mode & S_ISUID) &&
  	    !(attr->ia_valid & ATTR_KILL_SUID))
  		attr->ia_valid |= ATTR_KILL_SUID;
  
  	if (((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);
  }
  
  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 "LPU64"/"LPU64" objects "LPU64"/"LPU64"\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 "LPU64"/"LPU64" objects "LPU64"/"LPU64"\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 "LPU64" 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);
  	LASSERT(lli->lli_size_sem_owner != current);
  	down(&lli->lli_size_sem);
  	LASSERT(lli->lli_size_sem_owner == NULL);
  	lli->lli_size_sem_owner = current;
  }
  
  void ll_inode_size_unlock(struct inode *inode)
  {
  	struct ll_inode_info *lli;
  
  	lli = ll_i2info(inode);
  	LASSERT(lli->lli_size_sem_owner == current);
  	lli->lli_size_sem_owner = NULL;
  	up(&lli->lli_size_sem);
  }
  
  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 != NULL) {
  		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 "LPU64"\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;
  			ldlm_mode_t 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);
  			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_FLMDSCAPA) {
  		LASSERT(md->mds_capa);
  		ll_add_capa(inode, md->mds_capa);
  	}
  	if (body->valid & OBD_MD_FLOSSCAPA) {
  		LASSERT(md->oss_capa);
  		ll_add_capa(inode, md->oss_capa);
  	}
  }
  
  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); */
  
  	/* initializing backing dev info. */
  	inode->i_mapping->backing_dev_info = &s2lsi(inode->i_sb)->lsi_bdi;
  
  
  	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 != NULL)
  		/* 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(&inode->i_data, 0);
  
  	/* Workaround for LU-118 */
  	if (inode->i_data.nrpages) {
  		TREE_READ_LOCK_IRQ(&inode->i_data);
  		TREE_READ_UNLOCK_IRQ(&inode->i_data);
  		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 *)arg);
  	}
  	case FSFILT_IOC_SETFLAGS: {
  		struct lov_stripe_md *lsm;
  		struct obd_info oinfo = { { { 0 } } };
  		struct md_op_data *op_data;
  
  		if (get_user(flags, (int *)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;
  		}
  
  		OBDO_ALLOC(oinfo.oi_oa);
  		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;
  		oinfo.oi_capa = ll_mdscapa_get(inode);
  		obdo_set_parent_fid(oinfo.oi_oa, &ll_i2info(inode)->lli_fid);
  		rc = obd_setattr_rqset(sbi->ll_dt_exp, &oinfo, NULL);
  		capa_put(oinfo.oi_capa);
  		OBDO_FREE(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 == NULL) {
  		CERROR("Invalid MDC connection handle "LPX64"\n",
  		       sbi->ll_md_exp->exp_handle.h_cookie);
  		return;
  	}
  	obd->obd_force = 1;
  
  	obd = class_exp2obd(sbi->ll_dt_exp);
  	if (obd == NULL) {
  		CERROR("Invalid LOV connection handle "LPX64"\n",
  		       sbi->ll_dt_exp->exp_handle.h_cookie);
  		return;
  	}
  	obd->obd_force = 1;
  
  	OBD_ALLOC_PTR(ioc_data);
  	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);
  
  		OBD_FREE_PTR(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;
  }
  
  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;
  	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)
  		return rc;
  
  	if (*inode) {
  		ll_update_inode(*inode, &md);
  	} else {
  		LASSERT(sb != NULL);
  
  		/*
  		 * 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 == NULL || IS_ERR(*inode)) {
  #ifdef CONFIG_FS_POSIX_ACL
  			if (md.posix_acl) {
  				posix_acl_release(md.posix_acl);
  				md.posix_acl = NULL;
  			}
  #endif
  			rc = IS_ERR(*inode) ? PTR_ERR(*inode) : -ENOMEM;
  			*inode = NULL;
  			CERROR("new_inode -fatal: rc %d\n", rc);
  			GOTO(out, rc);
  		}
  	}
  
  	/* 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 != NULL && 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 != NULL);
  		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 != NULL)
  		obd_free_memmd(sbi->ll_dt_exp, &md.lsm);
  	md_free_lustre_md(sbi->ll_md_exp, &md);
  	return rc;
  }
  
  int ll_obd_statfs(struct inode *inode, void *arg)
  {
  	struct ll_sb_info *sbi = NULL;
  	struct obd_export *exp;
  	char *buf = NULL;
  	struct obd_ioctl_data *data = NULL;
  	__u32 type;
  	__u32 flags;
  	int len = 0, rc;
  
  	if (!inode || !(sbi = ll_i2sbi(inode)))
  		GOTO(out_statfs, rc = -EINVAL);
  
  	rc = obd_ioctl_getdata(&buf, &len, arg);
  	if (rc)
  		GOTO(out_statfs, rc);
  
  	data = (void*)buf;
  	if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2 ||
  	    !data->ioc_pbuf1 || !data->ioc_pbuf2)
  		GOTO(out_statfs, rc = -EINVAL);
  
  	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))
  		GOTO(out_statfs, rc = -EINVAL);
  
  	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
  		GOTO(out_statfs, rc = -ENODEV);
  
  	flags = (type & LL_STATFS_NODELAY) ? OBD_STATFS_NODELAY : 0;
  	rc = obd_iocontrol(IOC_OBD_STATFS, exp, len, buf, &flags);
  	if (rc)
  		GOTO(out_statfs, rc);
  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;
  	if (sscanf(ptr, "%lx", &x) != 1)
  		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)
  {
  	LASSERT(i1 != NULL);
  
  	if (namelen > ll_i2sbi(i1)->ll_namelen)
  		return ERR_PTR(-ENAMETOOLONG);
  
  	if (op_data == NULL)
  		OBD_ALLOC_PTR(op_data);
  
  	if (op_data == NULL)
  		return ERR_PTR(-ENOMEM);
  
  	ll_i2gids(op_data->op_suppgids, i1, i2);
  	op_data->op_fid1 = *ll_inode2fid(i1);
  	op_data->op_capa1 = ll_mdscapa_get(i1);
  
  	if (i2) {
  		op_data->op_fid2 = *ll_inode2fid(i2);
  		op_data->op_capa2 = ll_mdscapa_get(i2);
  	} else {
  		fid_zero(&op_data->op_fid2);
  		op_data->op_capa2 = NULL;
  	}
  
  	op_data->op_name = name;
  	op_data->op_namelen = namelen;
  	op_data->op_mode = mode;
  	op_data->op_mod_time = cfs_time_current_sec();
  	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 != NULL) &&
  	     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);
  		/** We ignore parent's capability temporary. */
  	}
  
  	/* When called by ll_setattr_raw, file is i1. */
  	if (LLIF_DATA_MODIFIED & ll_i2info(i1)->lli_flags)
  		op_data->op_bias |= MDS_DATA_MODIFIED;
  
  	return op_data;
  }
  
  void ll_finish_md_op_data(struct md_op_data *op_data)
  {
  	capa_put(op_data->op_capa1);
  	capa_put(op_data->op_capa2);
  	OBD_FREE_PTR(op_data);
  }
  
  int ll_show_options(struct seq_file *seq, struct dentry *dentry)
  {
  	struct ll_sb_info *sbi;
  
  	LASSERT((seq != NULL) && (dentry != NULL));
  	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 *)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 == NULL) {
  		/* 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;
  }
  
  static char* ll_d_path(struct dentry *dentry, char *buf, int bufsize)
  {
  	char *path = NULL;
  
  	struct path p;
  
  	p.dentry = dentry;
  	p.mnt = current->fs->root.mnt;
  	path_get(&p);
  	path = d_path(&p, buf, bufsize);
  	path_put(&p);
  
  	return path;
  }
  
  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 != NULL) {
  		dentry = d_find_alias(page->mapping->host);
  		if (dentry != NULL)
  			path = ll_d_path(dentry, buf, PAGE_SIZE);
  	}
  
  	CWARN("%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 != NULL)
  		dput(dentry);
  
  	if (buf != NULL)
  		free_page((unsigned long)buf);
  }
  