Btrfs: make SNAP_DESTROY async

[linux.git] / fs / xfs / xfs_inode_item.c

/*
 * 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_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_trans_priv.h"
#include "xfs_bmap_btree.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_error.h"
#include "xfs_trace.h"


kmem_zone_t	*xfs_ili_zone;		/* inode log item zone */

static inline struct xfs_inode_log_item *INODE_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_inode_log_item, ili_item);
}


/*
 * 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(
	struct xfs_log_item	*lip)
{
	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
	struct xfs_inode	*ip = iip->ili_inode;
	uint			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(
	struct xfs_log_item	*lip,
	struct xfs_log_iovec	*vecp)
{
	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
	struct xfs_inode	*ip = iip->ili_inode;
	uint			nvecs;
	size_t			data_bytes;
	xfs_bmbt_rec_t		*ext_buffer;
	xfs_mount_t		*mp;

	vecp->i_addr = &iip->ili_format;
	vecp->i_len  = sizeof(xfs_inode_log_format_t);
	vecp->i_type = XLOG_REG_TYPE_IFORMAT;
	vecp++;
	nvecs	     = 1;

	/*
	 * Make sure the linux inode is dirty. We do this before
	 * clearing i_update_core as the VFS will call back into
	 * XFS here and set i_update_core, so we need to dirty the
	 * inode first so that the ordering of i_update_core and
	 * unlogged modifications still works as described below.
	 */
	xfs_mark_inode_dirty_sync(ip);

	/*
	 * 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();
	}

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

	vecp->i_addr = &ip->i_d;
	vecp->i_len  = sizeof(struct xfs_icdinode);
	vecp->i_type = 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);
			ASSERT((ip->i_df.if_bytes /
				(uint)sizeof(xfs_bmbt_rec_t)) > 0);
#ifdef XFS_NATIVE_HOST
                       if (ip->i_d.di_nextents == ip->i_df.if_bytes /
                                               (uint)sizeof(xfs_bmbt_rec_t)) {
				/*
				 * There are no delayed allocation
				 * extents, so just point to the
				 * real extents array.
				 */
				vecp->i_addr = ip->i_df.if_u1.if_extents;
				vecp->i_len = ip->i_df.if_bytes;
				vecp->i_type = 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 = ext_buffer;
				vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
						XFS_DATA_FORK);
				vecp->i_type = 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 = ip->i_df.if_broot;
			vecp->i_len = ip->i_df.if_broot_bytes;
			vecp->i_type = 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 = 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;
			vecp->i_type = 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 == lip->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) {
#ifdef DEBUG
			int nrecs = ip->i_afp->if_bytes /
				(uint)sizeof(xfs_bmbt_rec_t);
			ASSERT(nrecs > 0);
			ASSERT(nrecs == ip->i_d.di_anextents);
			ASSERT(ip->i_afp->if_bytes > 0);
			ASSERT(ip->i_afp->if_u1.if_extents != NULL);
			ASSERT(ip->i_d.di_anextents > 0);
#endif
#ifdef XFS_NATIVE_HOST
			/*
			 * There are not delayed allocation extents
			 * for attributes, so just point at the array.
			 */
			vecp->i_addr = 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 = ext_buffer;
			vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
					XFS_ATTR_FORK);
#endif
			vecp->i_type = 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 = ip->i_afp->if_broot;
			vecp->i_len = ip->i_afp->if_broot_bytes;
			vecp->i_type = 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 = 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;
			vecp->i_type = XLOG_REG_TYPE_IATTR_LOCAL;
			vecp++;
			nvecs++;
			iip->ili_format.ilf_asize = (unsigned)data_bytes;
		}
		break;

	default:
		ASSERT(0);
		break;
	}

	ASSERT(nvecs == lip->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.
 */
STATIC void
xfs_inode_item_pin(
	struct xfs_log_item	*lip)
{
	struct xfs_inode	*ip = INODE_ITEM(lip)->ili_inode;

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

	trace_xfs_inode_pin(ip, _RET_IP_);
	atomic_inc(&ip->i_pincount);
}


/*
 * 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().
 *
 * Also wake up anyone in xfs_iunpin_wait() if the count goes to 0.
 */
STATIC void
xfs_inode_item_unpin(
	struct xfs_log_item	*lip,
	int			remove)
{
	struct xfs_inode	*ip = INODE_ITEM(lip)->ili_inode;

	trace_xfs_inode_unpin(ip, _RET_IP_);
	ASSERT(atomic_read(&ip->i_pincount) > 0);
	if (atomic_dec_and_test(&ip->i_pincount))
		wake_up(&ip->i_ipin_wait);
}

/*
 * 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(
	struct xfs_log_item	*lip)
{
	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
	struct xfs_inode	*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)) {
		/*
		 * inode has already been flushed to the backing buffer,
		 * leave it locked in shared mode, pushbuf routine will
		 * unlock it.
		 */
		return XFS_ITEM_PUSHBUF;
	}

	/* Stale items should force out the iclog */
	if (ip->i_flags & XFS_ISTALE) {
		xfs_ifunlock(ip);
		/*
		 * we hold the AIL lock - notify the unlock routine of this
		 * so it doesn't try to get the lock again.
		 */
		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(lip->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(
	struct xfs_log_item	*lip)
{
	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
	struct xfs_inode	*ip = iip->ili_inode;
	unsigned short		lock_flags;

	ASSERT(iip->ili_inode->i_itemp != NULL);
	ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));

	/*
	 * Clear the transaction pointer in the 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;
	}

	lock_flags = iip->ili_lock_flags;
	iip->ili_lock_flags = 0;
	if (lock_flags) {
		xfs_iunlock(iip->ili_inode, lock_flags);
		IRELE(iip->ili_inode);
	}
}

/*
 * 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.
 */
STATIC xfs_lsn_t
xfs_inode_item_committed(
	struct xfs_log_item	*lip,
	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 promote it and that will
 * allow the caller to write the buffer by triggering the xfsbufd to run.
 */
STATIC void
xfs_inode_item_pushbuf(
	struct xfs_log_item	*lip)
{
	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
	struct xfs_inode	*ip = iip->ili_inode;
	struct xfs_buf		*bp;

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));

	/*
	 * 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) ||
	    !(lip->li_flags & XFS_LI_IN_AIL)) {
		xfs_iunlock(ip, XFS_ILOCK_SHARED);
		return;
	}

	bp = xfs_incore(ip->i_mount->m_ddev_targp, iip->ili_format.ilf_blkno,
			iip->ili_format.ilf_len, XBF_TRYLOCK);

	xfs_iunlock(ip, XFS_ILOCK_SHARED);
	if (!bp)
		return;
	if (XFS_BUF_ISDELAYWRITE(bp))
		xfs_buf_delwri_promote(bp);
	xfs_buf_relse(bp);
}

/*
 * 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(
	struct xfs_log_item	*lip)
{
	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
	struct xfs_inode	*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);

	/*
	 * Push the inode to it's backing buffer. This will not remove the
	 * inode from the AIL - a further push will be required to trigger a
	 * buffer push. However, this allows all the dirty inodes to be pushed
	 * to the buffer before it is pushed to disk. THe buffer IO completion
	 * will pull th einode from the AIL, mark it clean and unlock the flush
	 * lock.
	 */
	(void) xfs_iflush(ip, 0);
	xfs_iunlock(ip, XFS_ILOCK_SHARED);
}

/*
 * XXX rcc - this one really has to do something.  Probably needs
 * to stamp in a new field in the incore inode.
 */
STATIC void
xfs_inode_item_committing(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
	INODE_ITEM(lip)->ili_last_lsn = lsn;
}

/*
 * This is the ops vector shared by all buf log items.
 */
static struct xfs_item_ops xfs_inode_item_ops = {
	.iop_size	= xfs_inode_item_size,
	.iop_format	= xfs_inode_item_format,
	.iop_pin	= xfs_inode_item_pin,
	.iop_unpin	= xfs_inode_item_unpin,
	.iop_trylock	= xfs_inode_item_trylock,
	.iop_unlock	= xfs_inode_item_unlock,
	.iop_committed	= xfs_inode_item_committed,
	.iop_push	= xfs_inode_item_push,
	.iop_pushbuf	= xfs_inode_item_pushbuf,
	.iop_committing = xfs_inode_item_committing
};


/*
 * Initialize the inode log item for a newly allocated (in-core) inode.
 */
void
xfs_inode_item_init(
	struct xfs_inode	*ip,
	struct xfs_mount	*mp)
{
	struct xfs_inode_log_item *iip;

	ASSERT(ip->i_itemp == NULL);
	iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);

	iip->ili_inode = ip;
	xfs_log_item_init(mp, &iip->ili_item, XFS_LI_INODE,
						&xfs_inode_item_ops);
	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.
 */
void
xfs_iflush_done(
	struct xfs_buf		*bp,
	struct xfs_log_item	*lip)
{
	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
	xfs_inode_t		*ip = iip->ili_inode;
	struct xfs_ail		*ailp = lip->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 && lip->li_lsn == iip->ili_flush_lsn) {
		spin_lock(&ailp->xa_lock);
		if (lip->li_lsn == iip->ili_flush_lsn) {
			/* xfs_trans_ail_delete() drops the AIL lock. */
			xfs_trans_ail_delete(ailp, lip);
		} 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);
}

/*
 * 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;

	iip = ip->i_itemp;
	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(
	struct xfs_buf		*bp,
	struct xfs_log_item	*lip)
{
	xfs_iflush_abort(INODE_ITEM(lip)->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 = 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 = 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;
}