/* -*- mode: c; c-basic-offset: 8; -*-
   * vim: noexpandtab sw=8 ts=8 sts=0:
   *
   * inode.c
   *
   * vfs' aops, fops, dops and iops
   *
   * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * 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 for more details.
   *
   * You should have received a copy of the GNU General Public
   * License along with this program; if not, write to the
   * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   * Boston, MA 021110-1307, USA.
   */
  
  #include <linux/fs.h>
  #include <linux/types.h>

  #include <linux/highmem.h>
  #include <linux/pagemap.h>

  #include <linux/quotaops.h>

  
  #include <asm/byteorder.h>

  #include <cluster/masklog.h>
  
  #include "ocfs2.h"
  
  #include "alloc.h"

  #include "dir.h"

  #include "blockcheck.h"

  #include "dlmglue.h"
  #include "extent_map.h"
  #include "file.h"

  #include "heartbeat.h"

  #include "inode.h"
  #include "journal.h"
  #include "namei.h"
  #include "suballoc.h"
  #include "super.h"
  #include "symlink.h"
  #include "sysfile.h"
  #include "uptodate.h"

  #include "xattr.h"

  #include "refcounttree.h"

  #include "ocfs2_trace.h"

  
  #include "buffer_head_io.h"

  struct ocfs2_find_inode_args
  {
  	u64		fi_blkno;
  	unsigned long	fi_ino;
  	unsigned int	fi_flags;

  	unsigned int	fi_sysfile_type;

  };

  static struct lock_class_key ocfs2_sysfile_lock_key[NUM_SYSTEM_INODES];

  static int ocfs2_read_locked_inode(struct inode *inode,
  				   struct ocfs2_find_inode_args *args);
  static int ocfs2_init_locked_inode(struct inode *inode, void *opaque);
  static int ocfs2_find_actor(struct inode *inode, void *opaque);
  static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
  				    struct inode *inode,
  				    struct buffer_head *fe_bh);

  void ocfs2_set_inode_flags(struct inode *inode)
  {
  	unsigned int flags = OCFS2_I(inode)->ip_attr;
  
  	inode->i_flags &= ~(S_IMMUTABLE |
  		S_SYNC | S_APPEND | S_NOATIME | S_DIRSYNC);
  
  	if (flags & OCFS2_IMMUTABLE_FL)
  		inode->i_flags |= S_IMMUTABLE;
  
  	if (flags & OCFS2_SYNC_FL)
  		inode->i_flags |= S_SYNC;
  	if (flags & OCFS2_APPEND_FL)
  		inode->i_flags |= S_APPEND;
  	if (flags & OCFS2_NOATIME_FL)
  		inode->i_flags |= S_NOATIME;
  	if (flags & OCFS2_DIRSYNC_FL)
  		inode->i_flags |= S_DIRSYNC;
  }

  /* Propagate flags from i_flags to OCFS2_I(inode)->ip_attr */
  void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi)
  {
  	unsigned int flags = oi->vfs_inode.i_flags;
  
  	oi->ip_attr &= ~(OCFS2_SYNC_FL|OCFS2_APPEND_FL|
  			OCFS2_IMMUTABLE_FL|OCFS2_NOATIME_FL|OCFS2_DIRSYNC_FL);
  	if (flags & S_SYNC)
  		oi->ip_attr |= OCFS2_SYNC_FL;
  	if (flags & S_APPEND)
  		oi->ip_attr |= OCFS2_APPEND_FL;
  	if (flags & S_IMMUTABLE)
  		oi->ip_attr |= OCFS2_IMMUTABLE_FL;
  	if (flags & S_NOATIME)
  		oi->ip_attr |= OCFS2_NOATIME_FL;
  	if (flags & S_DIRSYNC)
  		oi->ip_attr |= OCFS2_DIRSYNC_FL;
  }

  struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
  {
  	struct ocfs2_find_inode_args args;
  
  	args.fi_blkno = blkno;
  	args.fi_flags = 0;
  	args.fi_ino = ino_from_blkno(sb, blkno);
  	args.fi_sysfile_type = 0;
  
  	return ilookup5(sb, blkno, ocfs2_find_actor, &args);
  }

  struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
  			 int sysfile_type)

  {
  	struct inode *inode = NULL;
  	struct super_block *sb = osb->sb;
  	struct ocfs2_find_inode_args args;

  	trace_ocfs2_iget_begin((unsigned long long)blkno, flags,
  			       sysfile_type);

  
  	/* Ok. By now we've either got the offsets passed to us by the
  	 * caller, or we just pulled them off the bh. Lets do some
  	 * sanity checks to make sure they're OK. */
  	if (blkno == 0) {
  		inode = ERR_PTR(-EINVAL);
  		mlog_errno(PTR_ERR(inode));
  		goto bail;
  	}
  
  	args.fi_blkno = blkno;

  	args.fi_flags = flags;

  	args.fi_ino = ino_from_blkno(sb, blkno);

  	args.fi_sysfile_type = sysfile_type;

  
  	inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor,
  			     ocfs2_init_locked_inode, &args);
  	/* inode was *not* in the inode cache. 2.6.x requires
  	 * us to do our own read_inode call and unlock it
  	 * afterwards. */

  	if (inode == NULL) {
  		inode = ERR_PTR(-ENOMEM);
  		mlog_errno(PTR_ERR(inode));
  		goto bail;
  	}

  	trace_ocfs2_iget5_locked(inode->i_state);

  	if (inode->i_state & I_NEW) {

  		ocfs2_read_locked_inode(inode, &args);
  		unlock_new_inode(inode);
  	}

  	if (is_bad_inode(inode)) {
  		iput(inode);
  		inode = ERR_PTR(-ESTALE);

  		goto bail;
  	}
  
  bail:
  	if (!IS_ERR(inode)) {

  		trace_ocfs2_iget_end(inode, 
  			(unsigned long long)OCFS2_I(inode)->ip_blkno);

  	}

  
  	return inode;
  }
  
  
  /*
   * here's how inodes get read from disk:
   * iget5_locked -> find_actor -> OCFS2_FIND_ACTOR
   * found? : return the in-memory inode
   * not found? : get_new_inode -> OCFS2_INIT_LOCKED_INODE
   */
  
  static int ocfs2_find_actor(struct inode *inode, void *opaque)
  {
  	struct ocfs2_find_inode_args *args = NULL;
  	struct ocfs2_inode_info *oi = OCFS2_I(inode);
  	int ret = 0;

  	args = opaque;
  
  	mlog_bug_on_msg(!inode, "No inode in find actor!
  ");

  	trace_ocfs2_find_actor(inode, inode->i_ino, opaque, args->fi_blkno);

  	if (oi->ip_blkno != args->fi_blkno)
  		goto bail;

  	ret = 1;
  bail:

  	return ret;
  }
  
  /*
   * initialize the new inode, but don't do anything that would cause
   * us to sleep.
   * return 0 on success, 1 on failure
   */
  static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
  {
  	struct ocfs2_find_inode_args *args = opaque;

  	static struct lock_class_key ocfs2_quota_ip_alloc_sem_key,
  				     ocfs2_file_ip_alloc_sem_key;

  	inode->i_ino = args->fi_ino;
  	OCFS2_I(inode)->ip_blkno = args->fi_blkno;

  	if (args->fi_sysfile_type != 0)
  		lockdep_set_class(&inode->i_mutex,
  			&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);

  	if (args->fi_sysfile_type == USER_QUOTA_SYSTEM_INODE ||
  	    args->fi_sysfile_type == GROUP_QUOTA_SYSTEM_INODE ||
  	    args->fi_sysfile_type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
  	    args->fi_sysfile_type == LOCAL_GROUP_QUOTA_SYSTEM_INODE)
  		lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
  				  &ocfs2_quota_ip_alloc_sem_key);
  	else
  		lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
  				  &ocfs2_file_ip_alloc_sem_key);

  	return 0;
  }

  void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
  			  int create_ino)

  {
  	struct super_block *sb;
  	struct ocfs2_super *osb;

  	int use_plocks = 1;

  	sb = inode->i_sb;
  	osb = OCFS2_SB(sb);

  	if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
  	    ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks())
  		use_plocks = 0;

  	/*
  	 * These have all been checked by ocfs2_read_inode_block() or set
  	 * by ocfs2_mknod_locked(), so a failure is a code bug.
  	 */
  	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));  /* This means that read_inode
  						cannot create a superblock
  						inode today.  change if
  						that is needed. */
  	BUG_ON(!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)));
  	BUG_ON(le32_to_cpu(fe->i_fs_generation) != osb->fs_generation);

  	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
  	OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);

  	OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);

  	inode->i_version = 1;
  	inode->i_generation = le32_to_cpu(fe->i_generation);
  	inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
  	inode->i_mode = le16_to_cpu(fe->i_mode);
  	inode->i_uid = le32_to_cpu(fe->i_uid);
  	inode->i_gid = le32_to_cpu(fe->i_gid);

  
  	/* Fast symlinks will have i_size but no allocated clusters. */
  	if (S_ISLNK(inode->i_mode) && !fe->i_clusters)
  		inode->i_blocks = 0;
  	else

  		inode->i_blocks = ocfs2_inode_sector_count(inode);

  	inode->i_mapping->a_ops = &ocfs2_aops;

  	inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
  	inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
  	inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
  	inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
  	inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
  	inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
  
  	if (OCFS2_I(inode)->ip_blkno != le64_to_cpu(fe->i_blkno))
  		mlog(ML_ERROR,

  		     "ip_blkno %llu != i_blkno %llu!
  ",
  		     (unsigned long long)OCFS2_I(inode)->ip_blkno,

  		     (unsigned long long)le64_to_cpu(fe->i_blkno));

  	set_nlink(inode, ocfs2_read_links_count(fe));

  	trace_ocfs2_populate_inode(OCFS2_I(inode)->ip_blkno,
  				   le32_to_cpu(fe->i_flags));

  	if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) {

  		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE;

  		inode->i_flags |= S_NOQUOTA;
  	}

  	if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) {
  		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;

  	} else if (fe->i_flags & cpu_to_le32(OCFS2_BITMAP_FL)) {
  		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;

  	} else if (fe->i_flags & cpu_to_le32(OCFS2_QUOTA_FL)) {
  		inode->i_flags |= S_NOQUOTA;

  	} else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) {

  		/* we can't actually hit this as read_inode can't
  		 * handle superblocks today ;-) */
  		BUG();
  	}
  
  	switch (inode->i_mode & S_IFMT) {
  	    case S_IFREG:

  		    if (use_plocks)
  			    inode->i_fop = &ocfs2_fops;
  		    else
  			    inode->i_fop = &ocfs2_fops_no_plocks;

  		    inode->i_op = &ocfs2_file_iops;
  		    i_size_write(inode, le64_to_cpu(fe->i_size));
  		    break;
  	    case S_IFDIR:
  		    inode->i_op = &ocfs2_dir_iops;

  		    if (use_plocks)
  			    inode->i_fop = &ocfs2_dops;
  		    else
  			    inode->i_fop = &ocfs2_dops_no_plocks;

  		    i_size_write(inode, le64_to_cpu(fe->i_size));

  		    OCFS2_I(inode)->ip_dir_lock_gen = 1;

  		    break;
  	    case S_IFLNK:
  		    if (ocfs2_inode_is_fast_symlink(inode))
  			inode->i_op = &ocfs2_fast_symlink_inode_operations;
  		    else
  			inode->i_op = &ocfs2_symlink_inode_operations;
  		    i_size_write(inode, le64_to_cpu(fe->i_size));
  		    break;
  	    default:
  		    inode->i_op = &ocfs2_special_file_iops;
  		    init_special_inode(inode, inode->i_mode,
  				       inode->i_rdev);
  		    break;
  	}

  	if (create_ino) {
  		inode->i_ino = ino_from_blkno(inode->i_sb,
  			       le64_to_cpu(fe->i_blkno));
  
  		/*
  		 * If we ever want to create system files from kernel,
  		 * the generation argument to
  		 * ocfs2_inode_lock_res_init() will have to change.
  		 */

  		BUG_ON(le32_to_cpu(fe->i_flags) & OCFS2_SYSTEM_FL);

  		ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,

  					  OCFS2_LOCK_TYPE_META, 0, inode);

  
  		ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
  					  OCFS2_LOCK_TYPE_OPEN, 0, inode);

  	}

  	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_rw_lockres,

  				  OCFS2_LOCK_TYPE_RW, inode->i_generation,
  				  inode);

  	ocfs2_set_inode_flags(inode);

  	OCFS2_I(inode)->ip_last_used_slot = 0;
  	OCFS2_I(inode)->ip_last_used_group = 0;

  
  	if (S_ISDIR(inode->i_mode))
  		ocfs2_resv_set_type(&OCFS2_I(inode)->ip_la_data_resv,
  				    OCFS2_RESV_FLAG_DIR);

  }
  
  static int ocfs2_read_locked_inode(struct inode *inode,
  				   struct ocfs2_find_inode_args *args)
  {
  	struct super_block *sb;
  	struct ocfs2_super *osb;
  	struct ocfs2_dinode *fe;
  	struct buffer_head *bh = NULL;

  	int status, can_lock;
  	u32 generation = 0;

  	status = -EINVAL;
  	if (inode == NULL || inode->i_sb == NULL) {
  		mlog(ML_ERROR, "bad inode
  ");

  		return status;

  	}
  	sb = inode->i_sb;
  	osb = OCFS2_SB(sb);
  
  	if (!args) {
  		mlog(ML_ERROR, "bad inode args
  ");
  		make_bad_inode(inode);

  		return status;
  	}
  
  	/*
  	 * To improve performance of cold-cache inode stats, we take
  	 * the cluster lock here if possible.
  	 *
  	 * Generally, OCFS2 never trusts the contents of an inode
  	 * unless it's holding a cluster lock, so taking it here isn't
  	 * a correctness issue as much as it is a performance
  	 * improvement.
  	 *
  	 * There are three times when taking the lock is not a good idea:
  	 *
  	 * 1) During startup, before we have initialized the DLM.
  	 *
  	 * 2) If we are reading certain system files which never get
  	 *    cluster locks (local alloc, truncate log).
  	 *
  	 * 3) If the process doing the iget() is responsible for
  	 *    orphan dir recovery. We're holding the orphan dir lock and
  	 *    can get into a deadlock with another process on another
  	 *    node in ->delete_inode().
  	 *
  	 * #1 and #2 can be simply solved by never taking the lock
  	 * here for system files (which are the only type we read
  	 * during mount). It's a heavier approach, but our main

  	 * concern is user-accessible files anyway.

  	 *
  	 * #3 works itself out because we'll eventually take the
  	 * cluster lock before trusting anything anyway.
  	 */
  	can_lock = !(args->fi_flags & OCFS2_FI_FLAG_SYSFILE)

  		&& !(args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY)

  		&& !ocfs2_mount_local(osb);

  	trace_ocfs2_read_locked_inode(
  		(unsigned long long)OCFS2_I(inode)->ip_blkno, can_lock);

  	/*
  	 * To maintain backwards compatibility with older versions of
  	 * ocfs2-tools, we still store the generation value for system
  	 * files. The only ones that actually matter to userspace are
  	 * the journals, but it's easier and inexpensive to just flag
  	 * all system files similarly.
  	 */
  	if (args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
  		generation = osb->fs_generation;

  	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,

  				  OCFS2_LOCK_TYPE_META,
  				  generation, inode);

  	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
  				  OCFS2_LOCK_TYPE_OPEN,
  				  0, inode);

  	if (can_lock) {

  		status = ocfs2_open_lock(inode);
  		if (status) {
  			make_bad_inode(inode);
  			mlog_errno(status);
  			return status;
  		}

  		status = ocfs2_inode_lock(inode, NULL, 0);

  		if (status) {
  			make_bad_inode(inode);
  			mlog_errno(status);
  			return status;
  		}

  	}

  	if (args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY) {
  		status = ocfs2_try_open_lock(inode, 0);
  		if (status) {

  			make_bad_inode(inode);

  			return status;
  		}
  	}

  	if (can_lock) {
  		status = ocfs2_read_inode_block_full(inode, &bh,
  						     OCFS2_BH_IGNORE_CACHE);
  	} else {

  		status = ocfs2_read_blocks_sync(osb, args->fi_blkno, 1, &bh);

  		/*
  		 * If buffer is in jbd, then its checksum may not have been
  		 * computed as yet.
  		 */
  		if (!status && !buffer_jbd(bh))

  			status = ocfs2_validate_inode_block(osb->sb, bh);
  	}

  	if (status < 0) {
  		mlog_errno(status);

  		goto bail;
  	}

  	status = -EINVAL;

  	fe = (struct ocfs2_dinode *) bh->b_data;

  	/*
  	 * This is a code bug. Right now the caller needs to
  	 * understand whether it is asking for a system file inode or
  	 * not so the proper lock names can be built.
  	 */
  	mlog_bug_on_msg(!!(fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) !=
  			!!(args->fi_flags & OCFS2_FI_FLAG_SYSFILE),
  			"Inode %llu: system file state is ambigous
  ",
  			(unsigned long long)args->fi_blkno);

  
  	if (S_ISCHR(le16_to_cpu(fe->i_mode)) ||
  	    S_ISBLK(le16_to_cpu(fe->i_mode)))

  		inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));

  	ocfs2_populate_inode(inode, fe, 0);

  
  	BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno));

  	status = 0;
  
  bail:

  	if (can_lock)

  		ocfs2_inode_unlock(inode, 0);

  
  	if (status < 0)
  		make_bad_inode(inode);

  	if (args && bh)
  		brelse(bh);

  	return status;
  }
  
  void ocfs2_sync_blockdev(struct super_block *sb)
  {
  	sync_blockdev(sb->s_bdev);
  }
  
  static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
  				     struct inode *inode,
  				     struct buffer_head *fe_bh)
  {
  	int status = 0;

  	struct ocfs2_dinode *fe;

  	handle_t *handle = NULL;

  	fe = (struct ocfs2_dinode *) fe_bh->b_data;

  	/*
  	 * This check will also skip truncate of inodes with inline
  	 * data and fast symlinks.
  	 */

  	if (fe->i_clusters) {

  		if (ocfs2_should_order_data(inode))
  			ocfs2_begin_ordered_truncate(inode, 0);

  		handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
  		if (IS_ERR(handle)) {
  			status = PTR_ERR(handle);

  			handle = NULL;

  			mlog_errno(status);
  			goto out;
  		}

  		status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
  						 fe_bh,

  						 OCFS2_JOURNAL_ACCESS_WRITE);

  		if (status < 0) {
  			mlog_errno(status);
  			goto out;
  		}
  
  		i_size_write(inode, 0);
  
  		status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
  		if (status < 0) {
  			mlog_errno(status);
  			goto out;
  		}
  
  		ocfs2_commit_trans(osb, handle);
  		handle = NULL;

  		status = ocfs2_commit_truncate(osb, inode, fe_bh);

  		if (status < 0) {
  			mlog_errno(status);
  			goto out;
  		}

  	}

  out:
  	if (handle)
  		ocfs2_commit_trans(osb, handle);

  	return status;
  }
  
  static int ocfs2_remove_inode(struct inode *inode,
  			      struct buffer_head *di_bh,
  			      struct inode *orphan_dir_inode,
  			      struct buffer_head *orphan_dir_bh)
  {
  	int status;
  	struct inode *inode_alloc_inode = NULL;
  	struct buffer_head *inode_alloc_bh = NULL;

  	handle_t *handle;

  	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  	struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
  
  	inode_alloc_inode =
  		ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
  					    le16_to_cpu(di->i_suballoc_slot));
  	if (!inode_alloc_inode) {
  		status = -EEXIST;
  		mlog_errno(status);
  		goto bail;
  	}

  	mutex_lock(&inode_alloc_inode->i_mutex);

  	status = ocfs2_inode_lock(inode_alloc_inode, &inode_alloc_bh, 1);

  	if (status < 0) {

  		mutex_unlock(&inode_alloc_inode->i_mutex);

  
  		mlog_errno(status);
  		goto bail;
  	}

  	handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS +

  				   ocfs2_quota_trans_credits(inode->i_sb));

  	if (IS_ERR(handle)) {
  		status = PTR_ERR(handle);
  		mlog_errno(status);
  		goto bail_unlock;
  	}

  	if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
  		status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
  					  orphan_dir_bh);
  		if (status < 0) {
  			mlog_errno(status);
  			goto bail_commit;
  		}

  	}
  
  	/* set the inodes dtime */

  	status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,

  					 OCFS2_JOURNAL_ACCESS_WRITE);

  	if (status < 0) {
  		mlog_errno(status);
  		goto bail_commit;
  	}
  
  	di->i_dtime = cpu_to_le64(CURRENT_TIME.tv_sec);

  	di->i_flags &= cpu_to_le32(~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL));

  	ocfs2_journal_dirty(handle, di_bh);

  	ocfs2_remove_from_cache(INODE_CACHE(inode), di_bh);

  	dquot_free_inode(inode);

  
  	status = ocfs2_free_dinode(handle, inode_alloc_inode,
  				   inode_alloc_bh, di);
  	if (status < 0)
  		mlog_errno(status);
  
  bail_commit:

  	ocfs2_commit_trans(osb, handle);

  bail_unlock:

  	ocfs2_inode_unlock(inode_alloc_inode, 1);

  	mutex_unlock(&inode_alloc_inode->i_mutex);

  	brelse(inode_alloc_bh);
  bail:
  	iput(inode_alloc_inode);
  
  	return status;
  }

  /*

   * Serialize with orphan dir recovery. If the process doing
   * recovery on this orphan dir does an iget() with the dir
   * i_mutex held, we'll deadlock here. Instead we detect this
   * and exit early - recovery will wipe this inode for us.
   */
  static int ocfs2_check_orphan_recovery_state(struct ocfs2_super *osb,
  					     int slot)
  {
  	int ret = 0;
  
  	spin_lock(&osb->osb_lock);
  	if (ocfs2_node_map_test_bit(osb, &osb->osb_recovering_orphan_dirs, slot)) {

  		ret = -EDEADLK;
  		goto out;
  	}
  	/* This signals to the orphan recovery process that it should
  	 * wait for us to handle the wipe. */
  	osb->osb_orphan_wipes[slot]++;
  out:
  	spin_unlock(&osb->osb_lock);

  	trace_ocfs2_check_orphan_recovery_state(slot, ret);

  	return ret;
  }
  
  static void ocfs2_signal_wipe_completion(struct ocfs2_super *osb,
  					 int slot)
  {
  	spin_lock(&osb->osb_lock);
  	osb->osb_orphan_wipes[slot]--;
  	spin_unlock(&osb->osb_lock);
  
  	wake_up(&osb->osb_wipe_event);
  }

  static int ocfs2_wipe_inode(struct inode *inode,
  			    struct buffer_head *di_bh)
  {

  	int status, orphaned_slot = -1;

  	struct inode *orphan_dir_inode = NULL;
  	struct buffer_head *orphan_dir_bh = NULL;
  	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

  	struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;

  	if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
  		orphaned_slot = le16_to_cpu(di->i_orphaned_slot);

  		status = ocfs2_check_orphan_recovery_state(osb, orphaned_slot);
  		if (status)
  			return status;

  		orphan_dir_inode = ocfs2_get_system_file_inode(osb,
  							       ORPHAN_DIR_SYSTEM_INODE,
  							       orphaned_slot);
  		if (!orphan_dir_inode) {
  			status = -EEXIST;
  			mlog_errno(status);
  			goto bail;
  		}

  		/* Lock the orphan dir. The lock will be held for the entire
  		 * delete_inode operation. We do this now to avoid races with
  		 * recovery completion on other nodes. */
  		mutex_lock(&orphan_dir_inode->i_mutex);
  		status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
  		if (status < 0) {
  			mutex_unlock(&orphan_dir_inode->i_mutex);

  			mlog_errno(status);
  			goto bail;
  		}

  	}
  
  	/* we do this while holding the orphan dir lock because we

  	 * don't want recovery being run from another node to try an
  	 * inode delete underneath us -- this will result in two nodes

  	 * truncating the same file! */
  	status = ocfs2_truncate_for_delete(osb, inode, di_bh);
  	if (status < 0) {
  		mlog_errno(status);
  		goto bail_unlock_dir;
  	}

  	/* Remove any dir index tree */
  	if (S_ISDIR(inode->i_mode)) {
  		status = ocfs2_dx_dir_truncate(inode, di_bh);
  		if (status) {
  			mlog_errno(status);
  			goto bail_unlock_dir;
  		}
  	}

  	/*Free extended attribute resources associated with this inode.*/
  	status = ocfs2_xattr_remove(inode, di_bh);
  	if (status < 0) {
  		mlog_errno(status);
  		goto bail_unlock_dir;
  	}

  	status = ocfs2_remove_refcount_tree(inode, di_bh);
  	if (status < 0) {
  		mlog_errno(status);
  		goto bail_unlock_dir;
  	}

  	status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode,
  				    orphan_dir_bh);
  	if (status < 0)
  		mlog_errno(status);
  
  bail_unlock_dir:

  	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)
  		return status;

  	ocfs2_inode_unlock(orphan_dir_inode, 1);

  	mutex_unlock(&orphan_dir_inode->i_mutex);

  	brelse(orphan_dir_bh);
  bail:
  	iput(orphan_dir_inode);

  	ocfs2_signal_wipe_completion(osb, orphaned_slot);

  
  	return status;
  }
  
  /* There is a series of simple checks that should be done before a

   * trylock is even considered. Encapsulate those in this function. */

  static int ocfs2_inode_is_valid_to_delete(struct inode *inode)
  {
  	int ret = 0;
  	struct ocfs2_inode_info *oi = OCFS2_I(inode);
  	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

  	trace_ocfs2_inode_is_valid_to_delete(current, osb->dc_task,
  					     (unsigned long long)oi->ip_blkno,
  					     oi->ip_flags);

  	/* We shouldn't be getting here for the root directory
  	 * inode.. */
  	if (inode == osb->root_inode) {
  		mlog(ML_ERROR, "Skipping delete of root inode.
  ");
  		goto bail;
  	}

  	/* If we're coming from downconvert_thread we can't go into our own

  	 * voting [hello, deadlock city!], so unforuntately we just
  	 * have to skip deleting this guy. That's OK though because
  	 * the node who's doing the actual deleting should handle it
  	 * anyway. */

  	if (current == osb->dc_task)

  		goto bail;

  
  	spin_lock(&oi->ip_lock);
  	/* OCFS2 *never* deletes system files. This should technically
  	 * never get here as system file inodes should always have a
  	 * positive link count. */
  	if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) {

  		mlog(ML_ERROR, "Skipping delete of system file %llu
  ",
  		     (unsigned long long)oi->ip_blkno);

  		goto bail_unlock;
  	}

  	/* If we have allowd wipe of this inode for another node, it
  	 * will be marked here so we can safely skip it. Recovery will

  	 * cleanup any inodes we might inadvertently skip here. */

  	if (oi->ip_flags & OCFS2_INODE_SKIP_DELETE)

  		goto bail_unlock;

  
  	ret = 1;
  bail_unlock:
  	spin_unlock(&oi->ip_lock);
  bail:
  	return ret;
  }
  
  /* Query the cluster to determine whether we should wipe an inode from
   * disk or not.
   *
   * Requires the inode to have the cluster lock. */
  static int ocfs2_query_inode_wipe(struct inode *inode,
  				  struct buffer_head *di_bh,
  				  int *wipe)
  {

  	int status = 0, reason = 0;

  	struct ocfs2_inode_info *oi = OCFS2_I(inode);
  	struct ocfs2_dinode *di;
  
  	*wipe = 0;

  	trace_ocfs2_query_inode_wipe_begin((unsigned long long)oi->ip_blkno,
  					   inode->i_nlink);

  	/* While we were waiting for the cluster lock in
  	 * ocfs2_delete_inode, another node might have asked to delete
  	 * the inode. Recheck our flags to catch this. */
  	if (!ocfs2_inode_is_valid_to_delete(inode)) {

  		reason = 1;

  		goto bail;
  	}
  
  	/* Now that we have an up to date inode, we can double check
  	 * the link count. */

  	if (inode->i_nlink)

  		goto bail;

  
  	/* Do some basic inode verification... */
  	di = (struct ocfs2_dinode *) di_bh->b_data;

  	if (!(di->i_flags & cpu_to_le32(OCFS2_ORPHANED_FL)) &&
  	    !(oi->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {

  		/*
  		 * Inodes in the orphan dir must have ORPHANED_FL.  The only
  		 * inodes that come back out of the orphan dir are reflink
  		 * targets. A reflink target may be moved out of the orphan
  		 * dir between the time we scan the directory and the time we
  		 * process it. This would lead to HAS_REFCOUNT_FL being set but
  		 * ORPHANED_FL not.
  		 */
  		if (di->i_dyn_features & cpu_to_le16(OCFS2_HAS_REFCOUNT_FL)) {

  			reason = 2;

  			goto bail;
  		}

  		/* for lack of a better error? */
  		status = -EEXIST;
  		mlog(ML_ERROR,

  		     "Inode %llu (on-disk %llu) not orphaned! "

  		     "Disk flags  0x%x, inode flags 0x%x
  ",

  		     (unsigned long long)oi->ip_blkno,

  		     (unsigned long long)le64_to_cpu(di->i_blkno),
  		     le32_to_cpu(di->i_flags), oi->ip_flags);

  		goto bail;
  	}
  
  	/* has someone already deleted us?! baaad... */
  	if (di->i_dtime) {
  		status = -EEXIST;
  		mlog_errno(status);
  		goto bail;
  	}

  	/*
  	 * This is how ocfs2 determines whether an inode is still live
  	 * within the cluster. Every node takes a shared read lock on
  	 * the inode open lock in ocfs2_read_locked_inode(). When we
  	 * get to ->delete_inode(), each node tries to convert it's
  	 * lock to an exclusive. Trylocks are serialized by the inode

  	 * meta data lock. If the upconvert succeeds, we know the inode

  	 * is no longer live and can be deleted.
  	 *
  	 * Though we call this with the meta data lock held, the
  	 * trylock keeps us from ABBA deadlock.
  	 */
  	status = ocfs2_try_open_lock(inode, 1);

  	if (status == -EAGAIN) {

  		status = 0;

  		reason = 3;

  		goto bail;
  	}
  	if (status < 0) {
  		mlog_errno(status);
  		goto bail;
  	}

  	*wipe = 1;

  	trace_ocfs2_query_inode_wipe_succ(le16_to_cpu(di->i_orphaned_slot));

  
  bail:

  	trace_ocfs2_query_inode_wipe_end(status, reason);

  	return status;
  }
  
  /* Support function for ocfs2_delete_inode. Will help us keep the
   * inode data in a consistent state for clear_inode. Always truncates
   * pages, optionally sync's them first. */
  static void ocfs2_cleanup_delete_inode(struct inode *inode,
  				       int sync_data)
  {

  	trace_ocfs2_cleanup_delete_inode(
  		(unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data);

  	if (sync_data)

  		filemap_write_and_wait(inode->i_mapping);

  	truncate_inode_pages(&inode->i_data, 0);
  }

  static void ocfs2_delete_inode(struct inode *inode)

  {
  	int wipe, status;

  	sigset_t oldset;

  	struct buffer_head *di_bh = NULL;

  	trace_ocfs2_delete_inode(inode->i_ino,
  				 (unsigned long long)OCFS2_I(inode)->ip_blkno,
  				 is_bad_inode(inode));

  	/* When we fail in read_inode() we mark inode as bad. The second test
  	 * catches the case when inode allocation fails before allocating
  	 * a block for inode. */

  	if (is_bad_inode(inode) || !OCFS2_I(inode)->ip_blkno)

  		goto bail;

  	dquot_initialize(inode);

  	if (!ocfs2_inode_is_valid_to_delete(inode)) {
  		/* It's probably not necessary to truncate_inode_pages
  		 * here but we do it for safety anyway (it will most
  		 * likely be a no-op anyway) */
  		ocfs2_cleanup_delete_inode(inode, 0);
  		goto bail;
  	}
  
  	/* We want to block signals in delete_inode as the lock and
  	 * messaging paths may return us -ERESTARTSYS. Which would
  	 * cause us to exit early, resulting in inodes being orphaned
  	 * forever. */

  	ocfs2_block_signals(&oldset);

  	/*
  	 * Synchronize us against ocfs2_get_dentry. We take this in
  	 * shared mode so that all nodes can still concurrently
  	 * process deletes.
  	 */
  	status = ocfs2_nfs_sync_lock(OCFS2_SB(inode->i_sb), 0);
  	if (status < 0) {
  		mlog(ML_ERROR, "getting nfs sync lock(PR) failed %d
  ", status);
  		ocfs2_cleanup_delete_inode(inode, 0);
  		goto bail_unblock;
  	}

  	/* Lock down the inode. This gives us an up to date view of
  	 * it's metadata (for verification), and allows us to

  	 * serialize delete_inode on multiple nodes.

  	 *
  	 * Even though we might be doing a truncate, we don't take the
  	 * allocation lock here as it won't be needed - nobody will
  	 * have the file open.
  	 */

  	status = ocfs2_inode_lock(inode, &di_bh, 1);

  	if (status < 0) {
  		if (status != -ENOENT)
  			mlog_errno(status);
  		ocfs2_cleanup_delete_inode(inode, 0);

  		goto bail_unlock_nfs_sync;

  	}
  
  	/* Query the cluster. This will be the final decision made
  	 * before we go ahead and wipe the inode. */
  	status = ocfs2_query_inode_wipe(inode, di_bh, &wipe);
  	if (!wipe || status < 0) {

  		/* Error and remote inode busy both mean we won't be

  		 * removing the inode, so they take almost the same
  		 * path. */
  		if (status < 0)
  			mlog_errno(status);

  		/* Someone in the cluster has disallowed a wipe of
  		 * this inode, or it was never completely
  		 * orphaned. Write out the pages and exit now. */

  		ocfs2_cleanup_delete_inode(inode, 1);
  		goto bail_unlock_inode;
  	}
  
  	ocfs2_cleanup_delete_inode(inode, 0);
  
  	status = ocfs2_wipe_inode(inode, di_bh);
  	if (status < 0) {

  		if (status != -EDEADLK)
  			mlog_errno(status);

  		goto bail_unlock_inode;
  	}

  	/*
  	 * Mark the inode as successfully deleted.
  	 *
  	 * This is important for ocfs2_clear_inode() as it will check
  	 * this flag and skip any checkpointing work
  	 *
  	 * ocfs2_stuff_meta_lvb() also uses this flag to invalidate
  	 * the LVB for other nodes.
  	 */

  	OCFS2_I(inode)->ip_flags |= OCFS2_INODE_DELETED;
  
  bail_unlock_inode:

  	ocfs2_inode_unlock(inode, 1);

  	brelse(di_bh);

  
  bail_unlock_nfs_sync:
  	ocfs2_nfs_sync_unlock(OCFS2_SB(inode->i_sb), 0);

  bail_unblock:

  	ocfs2_unblock_signals(&oldset);

  bail:

  	return;

  }

  static void ocfs2_clear_inode(struct inode *inode)

  {
  	int status;
  	struct ocfs2_inode_info *oi = OCFS2_I(inode);

  	end_writeback(inode);

  	trace_ocfs2_clear_inode((unsigned long long)oi->ip_blkno,
  				inode->i_nlink);

  
  	mlog_bug_on_msg(OCFS2_SB(inode->i_sb) == NULL,
  			"Inode=%lu
  ", inode->i_ino);

  	dquot_drop(inode);

  	/* To preven remote deletes we hold open lock before, now it
  	 * is time to unlock PR and EX open locks. */

  	ocfs2_open_unlock(inode);

  	/* Do these before all the other work so that we don't bounce

  	 * the downconvert thread while waiting to destroy the locks. */

  	ocfs2_mark_lockres_freeing(&oi->ip_rw_lockres);

  	ocfs2_mark_lockres_freeing(&oi->ip_inode_lockres);

  	ocfs2_mark_lockres_freeing(&oi->ip_open_lockres);

  	ocfs2_resv_discard(&OCFS2_SB(inode->i_sb)->osb_la_resmap,
  			   &oi->ip_la_data_resv);
  	ocfs2_resv_init_once(&oi->ip_la_data_resv);

  	/* We very well may get a clear_inode before all an inodes
  	 * metadata has hit disk. Of course, we can't drop any cluster
  	 * locks until the journal has finished with it. The only
  	 * exception here are successfully wiped inodes - their
  	 * metadata can now be considered to be part of the system
  	 * inodes from which it came. */
  	if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED))
  		ocfs2_checkpoint_inode(inode);
  
  	mlog_bug_on_msg(!list_empty(&oi->ip_io_markers),

  			"Clear inode of %llu, inode has io markers
  ",
  			(unsigned long long)oi->ip_blkno);

  	ocfs2_extent_map_trunc(inode, 0);

  	status = ocfs2_drop_inode_locks(inode);
  	if (status < 0)
  		mlog_errno(status);
  
  	ocfs2_lock_res_free(&oi->ip_rw_lockres);

  	ocfs2_lock_res_free(&oi->ip_inode_lockres);

  	ocfs2_lock_res_free(&oi->ip_open_lockres);

  	ocfs2_metadata_cache_exit(INODE_CACHE(inode));

  	mlog_bug_on_msg(INODE_CACHE(inode)->ci_num_cached,

  			"Clear inode of %llu, inode has %u cache items
  ",

  			(unsigned long long)oi->ip_blkno,
  			INODE_CACHE(inode)->ci_num_cached);

  	mlog_bug_on_msg(!(INODE_CACHE(inode)->ci_flags & OCFS2_CACHE_FL_INLINE),

  			"Clear inode of %llu, inode has a bad flag
  ",
  			(unsigned long long)oi->ip_blkno);

  
  	mlog_bug_on_msg(spin_is_locked(&oi->ip_lock),

  			"Clear inode of %llu, inode is locked
  ",
  			(unsigned long long)oi->ip_blkno);

  	mlog_bug_on_msg(!mutex_trylock(&oi->ip_io_mutex),

  			"Clear inode of %llu, io_mutex is locked
  ",
  			(unsigned long long)oi->ip_blkno);

  	mutex_unlock(&oi->ip_io_mutex);

  
  	/*
  	 * down_trylock() returns 0, down_write_trylock() returns 1
  	 * kernel 1, world 0
  	 */
  	mlog_bug_on_msg(!down_write_trylock(&oi->ip_alloc_sem),

  			"Clear inode of %llu, alloc_sem is locked
  ",
  			(unsigned long long)oi->ip_blkno);

  	up_write(&oi->ip_alloc_sem);
  
  	mlog_bug_on_msg(oi->ip_open_count,

  			"Clear inode of %llu has open count %d
  ",
  			(unsigned long long)oi->ip_blkno, oi->ip_open_count);

  
  	/* Clear all other flags. */

  	oi->ip_flags = 0;

  	oi->ip_dir_start_lookup = 0;
  	oi->ip_blkno = 0ULL;

  
  	/*
  	 * ip_jinode is used to track txns against this inode. We ensure that
  	 * the journal is flushed before journal shutdown. Thus it is safe to
  	 * have inodes get cleaned up after journal shutdown.
  	 */

  	jbd2_journal_release_jbd_inode(OCFS2_SB(inode->i_sb)->journal->j_journal,
  				       &oi->ip_jinode);

  }

  void ocfs2_evict_inode(struct inode *inode)
  {
  	if (!inode->i_nlink ||
  	    (OCFS2_I(inode)->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)) {
  		ocfs2_delete_inode(inode);
  	} else {
  		truncate_inode_pages(&inode->i_data, 0);
  	}
  	ocfs2_clear_inode(inode);
  }

  /* Called under inode_lock, with no more references on the
   * struct inode, so it's safe here to check the flags field
   * and to manipulate i_nlink without any other locks. */

  int ocfs2_drop_inode(struct inode *inode)

  {
  	struct ocfs2_inode_info *oi = OCFS2_I(inode);

  	int res;

  	trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno,
  				inode->i_nlink, oi->ip_flags);

  	if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)

  		res = 1;

  	else

  		res = generic_drop_inode(inode);

  	return res;

  }
  
  /*

   * This is called from our getattr.
   */
  int ocfs2_inode_revalidate(struct dentry *dentry)
  {
  	struct inode *inode = dentry->d_inode;
  	int status = 0;

  	trace_ocfs2_inode_revalidate(inode,
  		inode ? (unsigned long long)OCFS2_I(inode)->ip_blkno : 0ULL,
  		inode ? (unsigned long long)OCFS2_I(inode)->ip_flags : 0);

  
  	if (!inode) {

  		status = -ENOENT;
  		goto bail;
  	}
  
  	spin_lock(&OCFS2_I(inode)->ip_lock);
  	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
  		spin_unlock(&OCFS2_I(inode)->ip_lock);

  		status = -ENOENT;
  		goto bail;
  	}
  	spin_unlock(&OCFS2_I(inode)->ip_lock);

  	/* Let ocfs2_inode_lock do the work of updating our struct

  	 * inode for us. */

  	status = ocfs2_inode_lock(inode, NULL, 0);

  	if (status < 0) {
  		if (status != -ENOENT)
  			mlog_errno(status);
  		goto bail;
  	}

  	ocfs2_inode_unlock(inode, 0);

  bail:

  	return status;
  }
  
  /*
   * Updates a disk inode from a
   * struct inode.
   * Only takes ip_lock.
   */

  int ocfs2_mark_inode_dirty(handle_t *handle,

  			   struct inode *inode,
  			   struct buffer_head *bh)
  {
  	int status;
  	struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;

  	trace_ocfs2_mark_inode_dirty((unsigned long long)OCFS2_I(inode)->ip_blkno);

  	status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,

  					 OCFS2_JOURNAL_ACCESS_WRITE);

  	if (status < 0) {
  		mlog_errno(status);
  		goto leave;
  	}
  
  	spin_lock(&OCFS2_I(inode)->ip_lock);
  	fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);

  	ocfs2_get_inode_flags(OCFS2_I(inode));

  	fe->i_attr = cpu_to_le32(OCFS2_I(inode)->ip_attr);

  	fe->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);

  	spin_unlock(&OCFS2_I(inode)->ip_lock);
  
  	fe->i_size = cpu_to_le64(i_size_read(inode));

  	ocfs2_set_links_count(fe, inode->i_nlink);

  	fe->i_uid = cpu_to_le32(inode->i_uid);
  	fe->i_gid = cpu_to_le32(inode->i_gid);
  	fe->i_mode = cpu_to_le16(inode->i_mode);
  	fe->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
  	fe->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
  	fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
  	fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
  	fe->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
  	fe->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);

  	ocfs2_journal_dirty(handle, bh);

  leave:

  	return status;
  }
  
  /*
   *
   * Updates a struct inode from a disk inode.
   * does no i/o, only takes ip_lock.
   */
  void ocfs2_refresh_inode(struct inode *inode,
  			 struct ocfs2_dinode *fe)
  {

  	spin_lock(&OCFS2_I(inode)->ip_lock);
  
  	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);

  	OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);

  	OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);

  	ocfs2_set_inode_flags(inode);

  	i_size_write(inode, le64_to_cpu(fe->i_size));

  	set_nlink(inode, ocfs2_read_links_count(fe));

  	inode->i_uid = le32_to_cpu(fe->i_uid);
  	inode->i_gid = le32_to_cpu(fe->i_gid);
  	inode->i_mode = le16_to_cpu(fe->i_mode);

  	if (S_ISLNK(inode->i_mode) && le32_to_cpu(fe->i_clusters) == 0)
  		inode->i_blocks = 0;
  	else

  		inode->i_blocks = ocfs2_inode_sector_count(inode);

  	inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
  	inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
  	inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
  	inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
  	inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
  	inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
  
  	spin_unlock(&OCFS2_I(inode)->ip_lock);
  }

  
  int ocfs2_validate_inode_block(struct super_block *sb,
  			       struct buffer_head *bh)
  {

  	int rc;

  	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;

  	trace_ocfs2_validate_inode_block((unsigned long long)bh->b_blocknr);

  	BUG_ON(!buffer_uptodate(bh));

  	/*
  	 * If the ecc fails, we return the error but otherwise
  	 * leave the filesystem running.  We know any error is
  	 * local to this block.
  	 */
  	rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check);

  	if (rc) {
  		mlog(ML_ERROR, "Checksum failed for dinode %llu
  ",
  		     (unsigned long long)bh->b_blocknr);

  		goto bail;

  	}

  
  	/*
  	 * Errors after here are fatal.
  	 */
  
  	rc = -EINVAL;

  	if (!OCFS2_IS_VALID_DINODE(di)) {
  		ocfs2_error(sb, "Invalid dinode #%llu: signature = %.*s
  ",
  			    (unsigned long long)bh->b_blocknr, 7,
  			    di->i_signature);
  		goto bail;
  	}
  
  	if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
  		ocfs2_error(sb, "Invalid dinode #%llu: i_blkno is %llu
  ",
  			    (unsigned long long)bh->b_blocknr,
  			    (unsigned long long)le64_to_cpu(di->i_blkno));
  		goto bail;
  	}
  
  	if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
  		ocfs2_error(sb,
  			    "Invalid dinode #%llu: OCFS2_VALID_FL not set
  ",
  			    (unsigned long long)bh->b_blocknr);
  		goto bail;
  	}
  
  	if (le32_to_cpu(di->i_fs_generation) !=
  	    OCFS2_SB(sb)->fs_generation) {
  		ocfs2_error(sb,
  			    "Invalid dinode #%llu: fs_generation is %u
  ",
  			    (unsigned long long)bh->b_blocknr,
  			    le32_to_cpu(di->i_fs_generation));
  		goto bail;
  	}
  
  	rc = 0;
  
  bail:
  	return rc;
  }
  
  int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
  				int flags)
  {
  	int rc;
  	struct buffer_head *tmp = *bh;

  	rc = ocfs2_read_blocks(INODE_CACHE(inode), OCFS2_I(inode)->ip_blkno,
  			       1, &tmp, flags, ocfs2_validate_inode_block);

  
  	/* If ocfs2_read_blocks() got us a new bh, pass it up. */

  	if (!rc && !*bh)

  		*bh = tmp;

  	return rc;
  }
  
  int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh)
  {
  	return ocfs2_read_inode_block_full(inode, bh, 0);
  }

  
  static u64 ocfs2_inode_cache_owner(struct ocfs2_caching_info *ci)
  {
  	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
  
  	return oi->ip_blkno;
  }

  static struct super_block *ocfs2_inode_cache_get_super(struct ocfs2_caching_info *ci)
  {
  	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
  
  	return oi->vfs_inode.i_sb;
  }

  static void ocfs2_inode_cache_lock(struct ocfs2_caching_info *ci)
  {
  	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
  
  	spin_lock(&oi->ip_lock);
  }
  
  static void ocfs2_inode_cache_unlock(struct ocfs2_caching_info *ci)
  {
  	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
  
  	spin_unlock(&oi->ip_lock);
  }
  
  static void ocfs2_inode_cache_io_lock(struct ocfs2_caching_info *ci)
  {
  	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
  
  	mutex_lock(&oi->ip_io_mutex);
  }
  
  static void ocfs2_inode_cache_io_unlock(struct ocfs2_caching_info *ci)
  {
  	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
  
  	mutex_unlock(&oi->ip_io_mutex);
  }
  
  const struct ocfs2_caching_operations ocfs2_inode_caching_ops = {
  	.co_owner		= ocfs2_inode_cache_owner,

  	.co_get_super		= ocfs2_inode_cache_get_super,

  	.co_cache_lock		= ocfs2_inode_cache_lock,
  	.co_cache_unlock	= ocfs2_inode_cache_unlock,
  	.co_io_lock		= ocfs2_inode_cache_io_lock,
  	.co_io_unlock		= ocfs2_inode_cache_io_unlock,
  };