/*

   * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   * 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.
   *

   * This program is distributed in the hope that it would 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 the Free Software Foundation,
   * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

   */

  #include "xfs.h"

  #include "xfs_fs.h"

  #include "xfs_types.h"

  #include "xfs_bit.h"

  #include "xfs_log.h"

  #include "xfs_inum.h"

  #include "xfs_trans.h"
  #include "xfs_buf_item.h"
  #include "xfs_sb.h"

  #include "xfs_ag.h"

  #include "xfs_dir2.h"
  #include "xfs_dmapi.h"
  #include "xfs_mount.h"
  #include "xfs_trans_priv.h"

  #include "xfs_bmap_btree.h"

  #include "xfs_alloc_btree.h"

  #include "xfs_ialloc_btree.h"

  #include "xfs_dir2_sf.h"

  #include "xfs_attr_sf.h"

  #include "xfs_dinode.h"

  #include "xfs_inode.h"

  #include "xfs_inode_item.h"
  #include "xfs_btree.h"
  #include "xfs_ialloc.h"

  #include "xfs_rw.h"

  #include "xfs_error.h"

  
  
  kmem_zone_t	*xfs_ili_zone;		/* inode log item zone */
  
  /*
   * This returns the number of iovecs needed to log the given inode item.
   *
   * We need one iovec for the inode log format structure, one for the
   * inode core, and possibly one for the inode data/extents/b-tree root
   * and one for the inode attribute data/extents/b-tree root.
   */
  STATIC uint
  xfs_inode_item_size(
  	xfs_inode_log_item_t	*iip)
  {
  	uint		nvecs;
  	xfs_inode_t	*ip;
  
  	ip = iip->ili_inode;
  	nvecs = 2;
  
  	/*
  	 * Only log the data/extents/b-tree root if there is something
  	 * left to log.
  	 */
  	iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
  
  	switch (ip->i_d.di_format) {
  	case XFS_DINODE_FMT_EXTENTS:
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
  			  XFS_ILOG_DEV | XFS_ILOG_UUID);
  		if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
  		    (ip->i_d.di_nextents > 0) &&
  		    (ip->i_df.if_bytes > 0)) {
  			ASSERT(ip->i_df.if_u1.if_extents != NULL);
  			nvecs++;
  		} else {
  			iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
  		}
  		break;
  
  	case XFS_DINODE_FMT_BTREE:
  		ASSERT(ip->i_df.if_ext_max ==
  		       XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
  			  XFS_ILOG_DEV | XFS_ILOG_UUID);
  		if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
  		    (ip->i_df.if_broot_bytes > 0)) {
  			ASSERT(ip->i_df.if_broot != NULL);
  			nvecs++;
  		} else {
  			ASSERT(!(iip->ili_format.ilf_fields &
  				 XFS_ILOG_DBROOT));
  #ifdef XFS_TRANS_DEBUG
  			if (iip->ili_root_size > 0) {
  				ASSERT(iip->ili_root_size ==
  				       ip->i_df.if_broot_bytes);
  				ASSERT(memcmp(iip->ili_orig_root,
  					    ip->i_df.if_broot,
  					    iip->ili_root_size) == 0);
  			} else {
  				ASSERT(ip->i_df.if_broot_bytes == 0);
  			}
  #endif
  			iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
  		}
  		break;
  
  	case XFS_DINODE_FMT_LOCAL:
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
  			  XFS_ILOG_DEV | XFS_ILOG_UUID);
  		if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
  		    (ip->i_df.if_bytes > 0)) {
  			ASSERT(ip->i_df.if_u1.if_data != NULL);
  			ASSERT(ip->i_d.di_size > 0);
  			nvecs++;
  		} else {
  			iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
  		}
  		break;
  
  	case XFS_DINODE_FMT_DEV:
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
  			  XFS_ILOG_DEXT | XFS_ILOG_UUID);
  		break;
  
  	case XFS_DINODE_FMT_UUID:
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
  			  XFS_ILOG_DEXT | XFS_ILOG_DEV);
  		break;
  
  	default:
  		ASSERT(0);
  		break;
  	}
  
  	/*
  	 * If there are no attributes associated with this file,
  	 * then there cannot be anything more to log.
  	 * Clear all attribute-related log flags.
  	 */
  	if (!XFS_IFORK_Q(ip)) {
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
  		return nvecs;
  	}
  
  	/*
  	 * Log any necessary attribute data.
  	 */
  	switch (ip->i_d.di_aformat) {
  	case XFS_DINODE_FMT_EXTENTS:
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
  		if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
  		    (ip->i_d.di_anextents > 0) &&
  		    (ip->i_afp->if_bytes > 0)) {
  			ASSERT(ip->i_afp->if_u1.if_extents != NULL);
  			nvecs++;
  		} else {
  			iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
  		}
  		break;
  
  	case XFS_DINODE_FMT_BTREE:
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
  		if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
  		    (ip->i_afp->if_broot_bytes > 0)) {
  			ASSERT(ip->i_afp->if_broot != NULL);
  			nvecs++;
  		} else {
  			iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
  		}
  		break;
  
  	case XFS_DINODE_FMT_LOCAL:
  		iip->ili_format.ilf_fields &=
  			~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
  		if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
  		    (ip->i_afp->if_bytes > 0)) {
  			ASSERT(ip->i_afp->if_u1.if_data != NULL);
  			nvecs++;
  		} else {
  			iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
  		}
  		break;
  
  	default:
  		ASSERT(0);
  		break;
  	}
  
  	return nvecs;
  }
  
  /*
   * This is called to fill in the vector of log iovecs for the
   * given inode log item.  It fills the first item with an inode
   * log format structure, the second with the on-disk inode structure,
   * and a possible third and/or fourth with the inode data/extents/b-tree
   * root and inode attributes data/extents/b-tree root.
   */
  STATIC void
  xfs_inode_item_format(
  	xfs_inode_log_item_t	*iip,
  	xfs_log_iovec_t		*log_vector)
  {
  	uint			nvecs;
  	xfs_log_iovec_t		*vecp;
  	xfs_inode_t		*ip;
  	size_t			data_bytes;
  	xfs_bmbt_rec_t		*ext_buffer;
  	int			nrecs;
  	xfs_mount_t		*mp;
  
  	ip = iip->ili_inode;
  	vecp = log_vector;
  
  	vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
  	vecp->i_len  = sizeof(xfs_inode_log_format_t);

  	XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);

  	vecp++;
  	nvecs	     = 1;
  
  	/*
  	 * Clear i_update_core if the timestamps (or any other
  	 * non-transactional modification) need flushing/logging
  	 * and we're about to log them with the rest of the core.
  	 *
  	 * This is the same logic as xfs_iflush() but this code can't
  	 * run at the same time as xfs_iflush because we're in commit
  	 * processing here and so we have the inode lock held in
  	 * exclusive mode.  Although it doesn't really matter
  	 * for the timestamps if both routines were to grab the
  	 * timestamps or not.  That would be ok.
  	 *
  	 * We clear i_update_core before copying out the data.
  	 * This is for coordination with our timestamp updates
  	 * that don't hold the inode lock. They will always
  	 * update the timestamps BEFORE setting i_update_core,
  	 * so if we clear i_update_core after they set it we
  	 * are guaranteed to see their updates to the timestamps
  	 * either here.  Likewise, if they set it after we clear it
  	 * here, we'll see it either on the next commit of this
  	 * inode or the next time the inode gets flushed via
  	 * xfs_iflush().  This depends on strongly ordered memory
  	 * semantics, but we have that.  We use the SYNCHRONIZE
  	 * macro to make sure that the compiler does not reorder
  	 * the i_update_core access below the data copy below.
  	 */
  	if (ip->i_update_core)  {
  		ip->i_update_core = 0;
  		SYNCHRONIZE();
  	}
  
  	/*
  	 * We don't have to worry about re-ordering here because
  	 * the update_size field is protected by the inode lock
  	 * and we have that held in exclusive mode.
  	 */
  	if (ip->i_update_size)
  		ip->i_update_size = 0;

  	/*
  	 * Make sure to get the latest atime from the Linux inode.
  	 */
  	xfs_synchronize_atime(ip);

  	/*
  	 * make sure the linux inode is dirty
  	 */
  	xfs_mark_inode_dirty_sync(ip);

  	vecp->i_addr = (xfs_caddr_t)&ip->i_d;

  	vecp->i_len  = sizeof(struct xfs_icdinode);

  	XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);

  	vecp++;
  	nvecs++;
  	iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
  
  	/*
  	 * If this is really an old format inode, then we need to
  	 * log it as such.  This means that we have to copy the link
  	 * count from the new field to the old.  We don't have to worry
  	 * about the new fields, because nothing trusts them as long as
  	 * the old inode version number is there.  If the superblock already
  	 * has a new version number, then we don't bother converting back.
  	 */
  	mp = ip->i_mount;

  	ASSERT(ip->i_d.di_version == 1 || xfs_sb_version_hasnlink(&mp->m_sb));
  	if (ip->i_d.di_version == 1) {

  		if (!xfs_sb_version_hasnlink(&mp->m_sb)) {

  			/*
  			 * Convert it back.
  			 */
  			ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
  			ip->i_d.di_onlink = ip->i_d.di_nlink;
  		} else {
  			/*
  			 * The superblock version has already been bumped,
  			 * so just make the conversion to the new inode
  			 * format permanent.
  			 */

  			ip->i_d.di_version = 2;

  			ip->i_d.di_onlink = 0;
  			memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
  		}
  	}
  
  	switch (ip->i_d.di_format) {
  	case XFS_DINODE_FMT_EXTENTS:
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
  			  XFS_ILOG_DEV | XFS_ILOG_UUID)));
  		if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
  			ASSERT(ip->i_df.if_bytes > 0);
  			ASSERT(ip->i_df.if_u1.if_extents != NULL);
  			ASSERT(ip->i_d.di_nextents > 0);
  			ASSERT(iip->ili_extents_buf == NULL);
  			nrecs = ip->i_df.if_bytes /
  				(uint)sizeof(xfs_bmbt_rec_t);
  			ASSERT(nrecs > 0);

  #ifdef XFS_NATIVE_HOST

  			if (nrecs == ip->i_d.di_nextents) {
  				/*
  				 * There are no delayed allocation
  				 * extents, so just point to the
  				 * real extents array.
  				 */
  				vecp->i_addr =
  					(char *)(ip->i_df.if_u1.if_extents);
  				vecp->i_len = ip->i_df.if_bytes;

  				XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);

  			} else
  #endif
  			{
  				/*
  				 * There are delayed allocation extents
  				 * in the inode, or we need to convert
  				 * the extents to on disk format.
  				 * Use xfs_iextents_copy()
  				 * to copy only the real extents into
  				 * a separate buffer.  We'll free the
  				 * buffer in the unlock routine.
  				 */
  				ext_buffer = kmem_alloc(ip->i_df.if_bytes,
  					KM_SLEEP);
  				iip->ili_extents_buf = ext_buffer;
  				vecp->i_addr = (xfs_caddr_t)ext_buffer;
  				vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
  						XFS_DATA_FORK);

  				XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);

  			}
  			ASSERT(vecp->i_len <= ip->i_df.if_bytes);
  			iip->ili_format.ilf_dsize = vecp->i_len;
  			vecp++;
  			nvecs++;
  		}
  		break;
  
  	case XFS_DINODE_FMT_BTREE:
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_DDATA | XFS_ILOG_DEXT |
  			  XFS_ILOG_DEV | XFS_ILOG_UUID)));
  		if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
  			ASSERT(ip->i_df.if_broot_bytes > 0);
  			ASSERT(ip->i_df.if_broot != NULL);
  			vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
  			vecp->i_len = ip->i_df.if_broot_bytes;

  			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);

  			vecp++;
  			nvecs++;
  			iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
  		}
  		break;
  
  	case XFS_DINODE_FMT_LOCAL:
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
  			  XFS_ILOG_DEV | XFS_ILOG_UUID)));
  		if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
  			ASSERT(ip->i_df.if_bytes > 0);
  			ASSERT(ip->i_df.if_u1.if_data != NULL);
  			ASSERT(ip->i_d.di_size > 0);
  
  			vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
  			/*
  			 * Round i_bytes up to a word boundary.
  			 * The underlying memory is guaranteed to
  			 * to be there by xfs_idata_realloc().
  			 */
  			data_bytes = roundup(ip->i_df.if_bytes, 4);
  			ASSERT((ip->i_df.if_real_bytes == 0) ||
  			       (ip->i_df.if_real_bytes == data_bytes));
  			vecp->i_len = (int)data_bytes;

  			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);

  			vecp++;
  			nvecs++;
  			iip->ili_format.ilf_dsize = (unsigned)data_bytes;
  		}
  		break;
  
  	case XFS_DINODE_FMT_DEV:
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
  			  XFS_ILOG_DDATA | XFS_ILOG_UUID)));
  		if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
  			iip->ili_format.ilf_u.ilfu_rdev =
  				ip->i_df.if_u2.if_rdev;
  		}
  		break;
  
  	case XFS_DINODE_FMT_UUID:
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
  			  XFS_ILOG_DDATA | XFS_ILOG_DEV)));
  		if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
  			iip->ili_format.ilf_u.ilfu_uuid =
  				ip->i_df.if_u2.if_uuid;
  		}
  		break;
  
  	default:
  		ASSERT(0);
  		break;
  	}
  
  	/*
  	 * If there are no attributes associated with the file,
  	 * then we're done.
  	 * Assert that no attribute-related log flags are set.
  	 */
  	if (!XFS_IFORK_Q(ip)) {
  		ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
  		iip->ili_format.ilf_size = nvecs;
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
  		return;
  	}
  
  	switch (ip->i_d.di_aformat) {
  	case XFS_DINODE_FMT_EXTENTS:
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
  		if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
  			ASSERT(ip->i_afp->if_bytes > 0);
  			ASSERT(ip->i_afp->if_u1.if_extents != NULL);
  			ASSERT(ip->i_d.di_anextents > 0);
  #ifdef DEBUG
  			nrecs = ip->i_afp->if_bytes /
  				(uint)sizeof(xfs_bmbt_rec_t);
  #endif
  			ASSERT(nrecs > 0);
  			ASSERT(nrecs == ip->i_d.di_anextents);

  #ifdef XFS_NATIVE_HOST

  			/*
  			 * There are not delayed allocation extents
  			 * for attributes, so just point at the array.
  			 */
  			vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
  			vecp->i_len = ip->i_afp->if_bytes;
  #else
  			ASSERT(iip->ili_aextents_buf == NULL);
  			/*
  			 * Need to endian flip before logging
  			 */
  			ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
  				KM_SLEEP);
  			iip->ili_aextents_buf = ext_buffer;
  			vecp->i_addr = (xfs_caddr_t)ext_buffer;
  			vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
  					XFS_ATTR_FORK);
  #endif

  			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);

  			iip->ili_format.ilf_asize = vecp->i_len;
  			vecp++;
  			nvecs++;
  		}
  		break;
  
  	case XFS_DINODE_FMT_BTREE:
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
  		if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
  			ASSERT(ip->i_afp->if_broot_bytes > 0);
  			ASSERT(ip->i_afp->if_broot != NULL);
  			vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
  			vecp->i_len = ip->i_afp->if_broot_bytes;

  			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);

  			vecp++;
  			nvecs++;
  			iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
  		}
  		break;
  
  	case XFS_DINODE_FMT_LOCAL:
  		ASSERT(!(iip->ili_format.ilf_fields &
  			 (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
  		if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
  			ASSERT(ip->i_afp->if_bytes > 0);
  			ASSERT(ip->i_afp->if_u1.if_data != NULL);
  
  			vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
  			/*
  			 * Round i_bytes up to a word boundary.
  			 * The underlying memory is guaranteed to
  			 * to be there by xfs_idata_realloc().
  			 */
  			data_bytes = roundup(ip->i_afp->if_bytes, 4);
  			ASSERT((ip->i_afp->if_real_bytes == 0) ||
  			       (ip->i_afp->if_real_bytes == data_bytes));
  			vecp->i_len = (int)data_bytes;

  			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);

  			vecp++;
  			nvecs++;
  			iip->ili_format.ilf_asize = (unsigned)data_bytes;
  		}
  		break;
  
  	default:
  		ASSERT(0);
  		break;
  	}
  
  	ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
  	iip->ili_format.ilf_size = nvecs;
  }
  
  
  /*
   * This is called to pin the inode associated with the inode log
   * item in memory so it cannot be written out.  Do this by calling
   * xfs_ipin() to bump the pin count in the inode while holding the
   * inode pin lock.
   */
  STATIC void
  xfs_inode_item_pin(
  	xfs_inode_log_item_t	*iip)
  {

  	ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));

  	xfs_ipin(iip->ili_inode);
  }
  
  
  /*
   * This is called to unpin the inode associated with the inode log
   * item which was previously pinned with a call to xfs_inode_item_pin().
   * Just call xfs_iunpin() on the inode to do this.
   */
  /* ARGSUSED */
  STATIC void
  xfs_inode_item_unpin(
  	xfs_inode_log_item_t	*iip,
  	int			stale)
  {
  	xfs_iunpin(iip->ili_inode);
  }
  
  /* ARGSUSED */
  STATIC void
  xfs_inode_item_unpin_remove(
  	xfs_inode_log_item_t	*iip,
  	xfs_trans_t		*tp)
  {
  	xfs_iunpin(iip->ili_inode);
  }
  
  /*
   * This is called to attempt to lock the inode associated with this
   * inode log item, in preparation for the push routine which does the actual
   * iflush.  Don't sleep on the inode lock or the flush lock.
   *
   * If the flush lock is already held, indicating that the inode has
   * been or is in the process of being flushed, then (ideally) we'd like to
   * see if the inode's buffer is still incore, and if so give it a nudge.
   * We delay doing so until the pushbuf routine, though, to avoid holding

   * the AIL lock across a call to the blackhole which is the buffer cache.

   * Also we don't want to sleep in any device strategy routines, which can happen
   * if we do the subsequent bawrite in here.
   */
  STATIC uint
  xfs_inode_item_trylock(
  	xfs_inode_log_item_t	*iip)
  {
  	register xfs_inode_t	*ip;
  
  	ip = iip->ili_inode;
  
  	if (xfs_ipincount(ip) > 0) {
  		return XFS_ITEM_PINNED;
  	}
  
  	if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
  		return XFS_ITEM_LOCKED;
  	}
  
  	if (!xfs_iflock_nowait(ip)) {
  		/*
  		 * If someone else isn't already trying to push the inode
  		 * buffer, we get to do it.
  		 */
  		if (iip->ili_pushbuf_flag == 0) {
  			iip->ili_pushbuf_flag = 1;
  #ifdef DEBUG

  			iip->ili_push_owner = current_pid();

  #endif
  			/*
  			 * Inode is left locked in shared mode.
  			 * Pushbuf routine gets to unlock it.
  			 */
  			return XFS_ITEM_PUSHBUF;
  		} else {
  			/*

  			 * We hold the AIL lock, so we must specify the

  			 * NONOTIFY flag so that we won't double trip.
  			 */
  			xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
  			return XFS_ITEM_FLUSHING;
  		}
  		/* NOTREACHED */
  	}
  
  	/* Stale items should force out the iclog */
  	if (ip->i_flags & XFS_ISTALE) {
  		xfs_ifunlock(ip);
  		xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
  		return XFS_ITEM_PINNED;
  	}
  
  #ifdef DEBUG
  	if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
  		ASSERT(iip->ili_format.ilf_fields != 0);
  		ASSERT(iip->ili_logged == 0);
  		ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
  	}
  #endif
  	return XFS_ITEM_SUCCESS;
  }
  
  /*
   * Unlock the inode associated with the inode log item.
   * Clear the fields of the inode and inode log item that
   * are specific to the current transaction.  If the
   * hold flags is set, do not unlock the inode.
   */
  STATIC void
  xfs_inode_item_unlock(
  	xfs_inode_log_item_t	*iip)
  {
  	uint		hold;
  	uint		iolocked;
  	uint		lock_flags;
  	xfs_inode_t	*ip;
  
  	ASSERT(iip != NULL);
  	ASSERT(iip->ili_inode->i_itemp != NULL);

  	ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));

  	ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
  		  XFS_ILI_IOLOCKED_EXCL)) ||

  	       xfs_isilocked(iip->ili_inode, XFS_IOLOCK_EXCL));

  	ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
  		  XFS_ILI_IOLOCKED_SHARED)) ||

  	       xfs_isilocked(iip->ili_inode, XFS_IOLOCK_SHARED));

  	/*
  	 * Clear the transaction pointer in the inode.
  	 */
  	ip = iip->ili_inode;
  	ip->i_transp = NULL;
  
  	/*
  	 * If the inode needed a separate buffer with which to log
  	 * its extents, then free it now.
  	 */
  	if (iip->ili_extents_buf != NULL) {
  		ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
  		ASSERT(ip->i_d.di_nextents > 0);
  		ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
  		ASSERT(ip->i_df.if_bytes > 0);

  		kmem_free(iip->ili_extents_buf);

  		iip->ili_extents_buf = NULL;
  	}
  	if (iip->ili_aextents_buf != NULL) {
  		ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
  		ASSERT(ip->i_d.di_anextents > 0);
  		ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
  		ASSERT(ip->i_afp->if_bytes > 0);

  		kmem_free(iip->ili_aextents_buf);

  		iip->ili_aextents_buf = NULL;
  	}
  
  	/*
  	 * Figure out if we should unlock the inode or not.
  	 */
  	hold = iip->ili_flags & XFS_ILI_HOLD;
  
  	/*
  	 * Before clearing out the flags, remember whether we
  	 * are holding the inode's IO lock.
  	 */
  	iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
  
  	/*
  	 * Clear out the fields of the inode log item particular
  	 * to the current transaction.
  	 */
  	iip->ili_ilock_recur = 0;
  	iip->ili_iolock_recur = 0;
  	iip->ili_flags = 0;
  
  	/*
  	 * Unlock the inode if XFS_ILI_HOLD was not set.
  	 */
  	if (!hold) {
  		lock_flags = XFS_ILOCK_EXCL;
  		if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
  			lock_flags |= XFS_IOLOCK_EXCL;
  		} else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
  			lock_flags |= XFS_IOLOCK_SHARED;
  		}
  		xfs_iput(iip->ili_inode, lock_flags);
  	}
  }
  
  /*
   * This is called to find out where the oldest active copy of the
   * inode log item in the on disk log resides now that the last log
   * write of it completed at the given lsn.  Since we always re-log
   * all dirty data in an inode, the latest copy in the on disk log
   * is the only one that matters.  Therefore, simply return the
   * given lsn.
   */
  /*ARGSUSED*/
  STATIC xfs_lsn_t
  xfs_inode_item_committed(
  	xfs_inode_log_item_t	*iip,
  	xfs_lsn_t		lsn)
  {
  	return (lsn);
  }
  
  /*

   * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
   * failed to get the inode flush lock but did get the inode locked SHARED.
   * Here we're trying to see if the inode buffer is incore, and if so whether it's
   * marked delayed write. If that's the case, we'll initiate a bawrite on that
   * buffer to expedite the process.
   *

   * We aren't holding the AIL lock (or the flush lock) when this gets called,

   * so it is inherently race-y.
   */
  STATIC void
  xfs_inode_item_pushbuf(
  	xfs_inode_log_item_t	*iip)
  {
  	xfs_inode_t	*ip;
  	xfs_mount_t	*mp;
  	xfs_buf_t	*bp;
  	uint		dopush;
  
  	ip = iip->ili_inode;

  	ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));

  
  	/*
  	 * The ili_pushbuf_flag keeps others from
  	 * trying to duplicate our effort.
  	 */
  	ASSERT(iip->ili_pushbuf_flag != 0);

  	ASSERT(iip->ili_push_owner == current_pid());

  
  	/*

  	 * If a flush is not in progress anymore, chances are that the
  	 * inode was taken off the AIL. So, just get out.

  	 */

  	if (completion_done(&ip->i_flush) ||

  	    ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
  		iip->ili_pushbuf_flag = 0;
  		xfs_iunlock(ip, XFS_ILOCK_SHARED);
  		return;
  	}
  
  	mp = ip->i_mount;
  	bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
  		    iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);
  
  	if (bp != NULL) {
  		if (XFS_BUF_ISDELAYWRITE(bp)) {
  			/*
  			 * We were racing with iflush because we don't hold

  			 * the AIL lock or the flush lock. However, at this point,

  			 * we have the buffer, and we know that it's dirty.
  			 * So, it's possible that iflush raced with us, and
  			 * this item is already taken off the AIL.
  			 * If not, we can flush it async.
  			 */
  			dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&

  				  !completion_done(&ip->i_flush));

  			iip->ili_pushbuf_flag = 0;
  			xfs_iunlock(ip, XFS_ILOCK_SHARED);
  			xfs_buftrace("INODE ITEM PUSH", bp);
  			if (XFS_BUF_ISPINNED(bp)) {
  				xfs_log_force(mp, (xfs_lsn_t)0,
  					      XFS_LOG_FORCE);
  			}
  			if (dopush) {

  				int	error;
  				error = xfs_bawrite(mp, bp);
  				if (error)
  					xfs_fs_cmn_err(CE_WARN, mp,
  		"xfs_inode_item_pushbuf: pushbuf error %d on iip %p, bp %p",
  							error, iip, bp);

  			} else {
  				xfs_buf_relse(bp);
  			}
  		} else {
  			iip->ili_pushbuf_flag = 0;
  			xfs_iunlock(ip, XFS_ILOCK_SHARED);
  			xfs_buf_relse(bp);
  		}
  		return;
  	}
  	/*
  	 * We have to be careful about resetting pushbuf flag too early (above).
  	 * Even though in theory we can do it as soon as we have the buflock,
  	 * we don't want others to be doing work needlessly. They'll come to
  	 * this function thinking that pushing the buffer is their
  	 * responsibility only to find that the buffer is still locked by
  	 * another doing the same thing
  	 */
  	iip->ili_pushbuf_flag = 0;
  	xfs_iunlock(ip, XFS_ILOCK_SHARED);
  	return;
  }
  
  
  /*
   * This is called to asynchronously write the inode associated with this
   * inode log item out to disk. The inode will already have been locked by
   * a successful call to xfs_inode_item_trylock().
   */
  STATIC void
  xfs_inode_item_push(
  	xfs_inode_log_item_t	*iip)
  {
  	xfs_inode_t	*ip;
  
  	ip = iip->ili_inode;

  	ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));

  	ASSERT(!completion_done(&ip->i_flush));

  	/*
  	 * Since we were able to lock the inode's flush lock and
  	 * we found it on the AIL, the inode must be dirty.  This
  	 * is because the inode is removed from the AIL while still
  	 * holding the flush lock in xfs_iflush_done().  Thus, if
  	 * we found it in the AIL and were able to obtain the flush
  	 * lock without sleeping, then there must not have been
  	 * anyone in the process of flushing the inode.
  	 */
  	ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
  	       iip->ili_format.ilf_fields != 0);
  
  	/*
  	 * Write out the inode.  The completion routine ('iflush_done') will
  	 * pull it from the AIL, mark it clean, unlock the flush lock.
  	 */
  	(void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
  	xfs_iunlock(ip, XFS_ILOCK_SHARED);
  
  	return;
  }
  
  /*
   * XXX rcc - this one really has to do something.  Probably needs
   * to stamp in a new field in the incore inode.
   */
  /* ARGSUSED */
  STATIC void
  xfs_inode_item_committing(
  	xfs_inode_log_item_t	*iip,
  	xfs_lsn_t		lsn)
  {
  	iip->ili_last_lsn = lsn;
  	return;
  }
  
  /*
   * This is the ops vector shared by all buf log items.
   */

  static struct xfs_item_ops xfs_inode_item_ops = {

  	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
  	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
  					xfs_inode_item_format,
  	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
  	.iop_unpin	= (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
  	.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
  					xfs_inode_item_unpin_remove,
  	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
  	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
  	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
  					xfs_inode_item_committed,
  	.iop_push	= (void(*)(xfs_log_item_t*))xfs_inode_item_push,

  	.iop_pushbuf	= (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
  	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
  					xfs_inode_item_committing
  };
  
  
  /*
   * Initialize the inode log item for a newly allocated (in-core) inode.
   */
  void
  xfs_inode_item_init(
  	xfs_inode_t	*ip,
  	xfs_mount_t	*mp)
  {
  	xfs_inode_log_item_t	*iip;
  
  	ASSERT(ip->i_itemp == NULL);
  	iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
  
  	iip->ili_item.li_type = XFS_LI_INODE;
  	iip->ili_item.li_ops = &xfs_inode_item_ops;
  	iip->ili_item.li_mountp = mp;

  	iip->ili_item.li_ailp = mp->m_ail;

  	iip->ili_inode = ip;
  
  	/*
  	   We have zeroed memory. No need ...
  	   iip->ili_extents_buf = NULL;
  	   iip->ili_pushbuf_flag = 0;
  	 */
  
  	iip->ili_format.ilf_type = XFS_LI_INODE;
  	iip->ili_format.ilf_ino = ip->i_ino;

  	iip->ili_format.ilf_blkno = ip->i_imap.im_blkno;
  	iip->ili_format.ilf_len = ip->i_imap.im_len;
  	iip->ili_format.ilf_boffset = ip->i_imap.im_boffset;

  }
  
  /*
   * Free the inode log item and any memory hanging off of it.
   */
  void
  xfs_inode_item_destroy(
  	xfs_inode_t	*ip)
  {
  #ifdef XFS_TRANS_DEBUG
  	if (ip->i_itemp->ili_root_size != 0) {

  		kmem_free(ip->i_itemp->ili_orig_root);

  	}
  #endif
  	kmem_zone_free(xfs_ili_zone, ip->i_itemp);
  }
  
  
  /*
   * This is the inode flushing I/O completion routine.  It is called
   * from interrupt level when the buffer containing the inode is
   * flushed to disk.  It is responsible for removing the inode item
   * from the AIL if it has not been re-logged, and unlocking the inode's
   * flush lock.
   */
  /*ARGSUSED*/
  void
  xfs_iflush_done(
  	xfs_buf_t		*bp,
  	xfs_inode_log_item_t	*iip)
  {

  	xfs_inode_t		*ip = iip->ili_inode;
  	struct xfs_ail		*ailp = iip->ili_item.li_ailp;

  
  	/*
  	 * We only want to pull the item from the AIL if it is
  	 * actually there and its location in the log has not
  	 * changed since we started the flush.  Thus, we only bother
  	 * if the ili_logged flag is set and the inode's lsn has not
  	 * changed.  First we check the lsn outside
  	 * the lock since it's cheaper, and then we recheck while
  	 * holding the lock before removing the inode from the AIL.
  	 */
  	if (iip->ili_logged &&
  	    (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {

  		spin_lock(&ailp->xa_lock);

  		if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {

  			/* xfs_trans_ail_delete() drops the AIL lock. */
  			xfs_trans_ail_delete(ailp, (xfs_log_item_t*)iip);

  		} else {

  			spin_unlock(&ailp->xa_lock);

  		}
  	}
  
  	iip->ili_logged = 0;
  
  	/*
  	 * Clear the ili_last_fields bits now that we know that the
  	 * data corresponding to them is safely on disk.
  	 */
  	iip->ili_last_fields = 0;
  
  	/*
  	 * Release the inode's flush lock since we're done with it.
  	 */
  	xfs_ifunlock(ip);
  
  	return;
  }
  
  /*
   * This is the inode flushing abort routine.  It is called
   * from xfs_iflush when the filesystem is shutting down to clean
   * up the inode state.
   * It is responsible for removing the inode item
   * from the AIL if it has not been re-logged, and unlocking the inode's
   * flush lock.
   */
  void
  xfs_iflush_abort(
  	xfs_inode_t		*ip)
  {

  	xfs_inode_log_item_t	*iip = ip->i_itemp;

  	xfs_mount_t		*mp;

  
  	iip = ip->i_itemp;
  	mp = ip->i_mount;
  	if (iip) {

  		struct xfs_ail	*ailp = iip->ili_item.li_ailp;

  		if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {

  			spin_lock(&ailp->xa_lock);

  			if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {

  				/* xfs_trans_ail_delete() drops the AIL lock. */
  				xfs_trans_ail_delete(ailp, (xfs_log_item_t *)iip);

  			} else

  				spin_unlock(&ailp->xa_lock);

  		}
  		iip->ili_logged = 0;
  		/*
  		 * Clear the ili_last_fields bits now that we know that the
  		 * data corresponding to them is safely on disk.
  		 */
  		iip->ili_last_fields = 0;
  		/*
  		 * Clear the inode logging fields so no more flushes are
  		 * attempted.
  		 */
  		iip->ili_format.ilf_fields = 0;
  	}
  	/*
  	 * Release the inode's flush lock since we're done with it.
  	 */
  	xfs_ifunlock(ip);
  }
  
  void
  xfs_istale_done(
  	xfs_buf_t		*bp,
  	xfs_inode_log_item_t	*iip)
  {
  	xfs_iflush_abort(iip->ili_inode);
  }

  
  /*
   * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
   * (which can have different field alignments) to the native version
   */
  int
  xfs_inode_item_format_convert(
  	xfs_log_iovec_t		*buf,
  	xfs_inode_log_format_t	*in_f)
  {
  	if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
  		xfs_inode_log_format_32_t *in_f32;
  
  		in_f32 = (xfs_inode_log_format_32_t *)buf->i_addr;
  		in_f->ilf_type = in_f32->ilf_type;
  		in_f->ilf_size = in_f32->ilf_size;
  		in_f->ilf_fields = in_f32->ilf_fields;
  		in_f->ilf_asize = in_f32->ilf_asize;
  		in_f->ilf_dsize = in_f32->ilf_dsize;
  		in_f->ilf_ino = in_f32->ilf_ino;
  		/* copy biggest field of ilf_u */
  		memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
  		       in_f32->ilf_u.ilfu_uuid.__u_bits,
  		       sizeof(uuid_t));
  		in_f->ilf_blkno = in_f32->ilf_blkno;
  		in_f->ilf_len = in_f32->ilf_len;
  		in_f->ilf_boffset = in_f32->ilf_boffset;
  		return 0;
  	} else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
  		xfs_inode_log_format_64_t *in_f64;
  
  		in_f64 = (xfs_inode_log_format_64_t *)buf->i_addr;
  		in_f->ilf_type = in_f64->ilf_type;
  		in_f->ilf_size = in_f64->ilf_size;
  		in_f->ilf_fields = in_f64->ilf_fields;
  		in_f->ilf_asize = in_f64->ilf_asize;
  		in_f->ilf_dsize = in_f64->ilf_dsize;
  		in_f->ilf_ino = in_f64->ilf_ino;
  		/* copy biggest field of ilf_u */
  		memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
  		       in_f64->ilf_u.ilfu_uuid.__u_bits,
  		       sizeof(uuid_t));
  		in_f->ilf_blkno = in_f64->ilf_blkno;
  		in_f->ilf_len = in_f64->ilf_len;
  		in_f->ilf_boffset = in_f64->ilf_boffset;
  		return 0;
  	}
  	return EFSCORRUPTED;
  }