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inode items and EFI/EFDs have different ondisk format for 32bit and 64bit kernels
allow recovery to handle both versions and do the necessary decoding
Merge of xfs-linux-melb:xfs-kern:26011a by kenmcd.

  Code to convert the 32 bit and 64 bit versions of EFIs to the native version.
  We don't convert the EFDs extents because their extents are never used.

/*
 * Copyright (c) 2000-2001,2005 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_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_sb.h"
#include "xfs_dir.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_trans_priv.h"
#include "xfs_extfree_item.h"


kmem_zone_t	*xfs_efi_zone;
kmem_zone_t	*xfs_efd_zone;

STATIC void	xfs_efi_item_unlock(xfs_efi_log_item_t *);
STATIC void	xfs_efi_item_abort(xfs_efi_log_item_t *);
STATIC void	xfs_efd_item_abort(xfs_efd_log_item_t *);


void
xfs_efi_item_free(xfs_efi_log_item_t *efip)
{
	int nexts = efip->efi_format.efi_nextents;

	if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
		kmem_free(efip, sizeof(xfs_efi_log_item_t) +
				(nexts - 1) * sizeof(xfs_extent_t));
	} else {
		kmem_zone_free(xfs_efi_zone, efip);
	}
}

/*
 * This returns the number of iovecs needed to log the given efi item.
 * We only need 1 iovec for an efi item.  It just logs the efi_log_format
 * structure.
 */
/*ARGSUSED*/
STATIC uint
xfs_efi_item_size(xfs_efi_log_item_t *efip)
{
	return 1;
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given efi log item. We use only 1 iovec, and we point that
 * at the efi_log_format structure embedded in the efi item.
 * It is at this point that we assert that all of the extent
 * slots in the efi item have been filled.
 */
STATIC void
xfs_efi_item_format(xfs_efi_log_item_t	*efip,
		    xfs_log_iovec_t	*log_vector)
{
	uint	size;

	ASSERT(efip->efi_next_extent == efip->efi_format.efi_nextents);

	efip->efi_format.efi_type = XFS_LI_EFI;

	size = sizeof(xfs_efi_log_format_t);
	size += (efip->efi_format.efi_nextents - 1) * sizeof(xfs_extent_t);
	efip->efi_format.efi_size = 1;

	log_vector->i_addr = (xfs_caddr_t)&(efip->efi_format);
	log_vector->i_len = size;
	XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_EFI_FORMAT);
	ASSERT(size >= sizeof(xfs_efi_log_format_t));
}


/*
 * Pinning has no meaning for an efi item, so just return.
 */
/*ARGSUSED*/
STATIC void
xfs_efi_item_pin(xfs_efi_log_item_t *efip)
{
	return;
}


/*
 * While EFIs cannot really be pinned, the unpin operation is the
 * last place at which the EFI is manipulated during a transaction.
 * Here we coordinate with xfs_efi_cancel() to determine who gets to
 * free the EFI.
 */
/*ARGSUSED*/
STATIC void
xfs_efi_item_unpin(xfs_efi_log_item_t *efip, int stale)
{
	xfs_mount_t	*mp;
	SPLDECL(s);

	mp = efip->efi_item.li_mountp;
	AIL_LOCK(mp, s);
	if (efip->efi_flags & XFS_EFI_CANCELED) {
		/*
		 * xfs_trans_delete_ail() drops the AIL lock.
		 */
		xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
		xfs_efi_item_free(efip);
	} else {
		efip->efi_flags |= XFS_EFI_COMMITTED;
		AIL_UNLOCK(mp, s);
	}
}

/*
 * like unpin only we have to also clear the xaction descriptor
 * pointing the log item if we free the item.  This routine duplicates
 * unpin because efi_flags is protected by the AIL lock.  Freeing
 * the descriptor and then calling unpin would force us to drop the AIL
 * lock which would open up a race condition.
 */
STATIC void
xfs_efi_item_unpin_remove(xfs_efi_log_item_t *efip, xfs_trans_t *tp)
{
	xfs_mount_t	*mp;
	xfs_log_item_desc_t	*lidp;
	SPLDECL(s);

	mp = efip->efi_item.li_mountp;
	AIL_LOCK(mp, s);
	if (efip->efi_flags & XFS_EFI_CANCELED) {
		/*
		 * free the xaction descriptor pointing to this item
		 */
		lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) efip);
		xfs_trans_free_item(tp, lidp);
		/*
		 * pull the item off the AIL.
		 * xfs_trans_delete_ail() drops the AIL lock.
		 */
		xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
		xfs_efi_item_free(efip);
	} else {
		efip->efi_flags |= XFS_EFI_COMMITTED;
		AIL_UNLOCK(mp, s);
	}
}

/*
 * Efi items have no locking or pushing.  However, since EFIs are
 * pulled from the AIL when their corresponding EFDs are committed
 * to disk, their situation is very similar to being pinned.  Return
 * XFS_ITEM_PINNED so that the caller will eventually flush the log.
 * This should help in getting the EFI out of the AIL.
 */
/*ARGSUSED*/
STATIC uint
xfs_efi_item_trylock(xfs_efi_log_item_t *efip)
{
	return XFS_ITEM_PINNED;
}

/*
 * Efi items have no locking, so just return.
 */
/*ARGSUSED*/
STATIC void
xfs_efi_item_unlock(xfs_efi_log_item_t *efip)
{
	if (efip->efi_item.li_flags & XFS_LI_ABORTED)
		xfs_efi_item_abort(efip);
	return;
}

/*
 * The EFI is logged only once and cannot be moved in the log, so
 * simply return the lsn at which it's been logged.  The canceled
 * flag is not paid any attention here.  Checking for that is delayed
 * until the EFI is unpinned.
 */
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_efi_item_committed(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
{
	return lsn;
}

/*
 * This is called when the transaction logging the EFI is aborted.
 * Free up the EFI and return.  No need to clean up the slot for
 * the item in the transaction.  That was done by the unpin code
 * which is called prior to this routine in the abort/fs-shutdown path.
 */
STATIC void
xfs_efi_item_abort(xfs_efi_log_item_t *efip)
{
	xfs_efi_item_free(efip);
}

/*
 * There isn't much you can do to push on an efi item.  It is simply
 * stuck waiting for all of its corresponding efd items to be
 * committed to disk.
 */
/*ARGSUSED*/
STATIC void
xfs_efi_item_push(xfs_efi_log_item_t *efip)
{
	return;
}

/*
 * The EFI dependency tracking op doesn't do squat.  It can't because
 * it doesn't know where the free extent is coming from.  The dependency
 * tracking has to be handled by the "enclosing" metadata object.  For
 * example, for inodes, the inode is locked throughout the extent freeing
 * so the dependency should be recorded there.
 */
/*ARGSUSED*/
STATIC void
xfs_efi_item_committing(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
{
	return;
}

/*
 * This is the ops vector shared by all efi log items.
 */
STATIC struct xfs_item_ops xfs_efi_item_ops = {
	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_efi_item_size,
	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
					xfs_efi_item_format,
	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_efi_item_pin,
	.iop_unpin	= (void(*)(xfs_log_item_t*, int))xfs_efi_item_unpin,
	.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *))
					xfs_efi_item_unpin_remove,
	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_efi_item_trylock,
	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_efi_item_unlock,
	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_efi_item_committed,
	.iop_push	= (void(*)(xfs_log_item_t*))xfs_efi_item_push,
	.iop_abort	= (void(*)(xfs_log_item_t*))xfs_efi_item_abort,
	.iop_pushbuf	= NULL,
	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_efi_item_committing
};


/*
 * Allocate and initialize an efi item with the given number of extents.
 */
xfs_efi_log_item_t *
xfs_efi_init(xfs_mount_t	*mp,
	     uint		nextents)

{
	xfs_efi_log_item_t	*efip;
	uint			size;

	ASSERT(nextents > 0);
	if (nextents > XFS_EFI_MAX_FAST_EXTENTS) {
		size = (uint)(sizeof(xfs_efi_log_item_t) +
			((nextents - 1) * sizeof(xfs_extent_t)));
		efip = (xfs_efi_log_item_t*)kmem_zalloc(size, KM_SLEEP);
	} else {
		efip = (xfs_efi_log_item_t*)kmem_zone_zalloc(xfs_efi_zone,
							     KM_SLEEP);
	}

	efip->efi_item.li_type = XFS_LI_EFI;
	efip->efi_item.li_ops = &xfs_efi_item_ops;
	efip->efi_item.li_mountp = mp;
	efip->efi_format.efi_nextents = nextents;
	efip->efi_format.efi_id = (__psint_t)(void*)efip;

	return (efip);
}

/*
 * Copy an EFI format buffer from the given buf, and into the destination
 * EFI format structure.
 * The given buffer can be in 32 bit or 64 bit form (which has different padding),
 * one of which will be the native format for this kernel.
 * It will handle the conversion of formats if necessary.
 */
int
xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt)
{
	xfs_efi_log_format_t *src_efi_fmt = (xfs_efi_log_format_t *)buf->i_addr;
	uint i;
	uint len = sizeof(xfs_efi_log_format_t) + 
		(src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_t);  
	uint len32 = sizeof(xfs_efi_log_format_32_t) + 
		(src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_32_t);  
	uint len64 = sizeof(xfs_efi_log_format_64_t) + 
		(src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_64_t);  

	if (buf->i_len == len) {
		memcpy((char *)dst_efi_fmt, (char*)src_efi_fmt, len);
		return 0;
	} else if (buf->i_len == len32) {
		xfs_efi_log_format_32_t *src_efi_fmt_32 =
			(xfs_efi_log_format_32_t *)buf->i_addr;

		dst_efi_fmt->efi_type     = src_efi_fmt_32->efi_type;
		dst_efi_fmt->efi_size     = src_efi_fmt_32->efi_size;
		dst_efi_fmt->efi_nextents = src_efi_fmt_32->efi_nextents;
		dst_efi_fmt->efi_id       = src_efi_fmt_32->efi_id;
		for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
			dst_efi_fmt->efi_extents[i].ext_start =
				src_efi_fmt_32->efi_extents[i].ext_start;
			dst_efi_fmt->efi_extents[i].ext_len =
				src_efi_fmt_32->efi_extents[i].ext_len;
		}
		return 0;
	} else if (buf->i_len == len64) {
		xfs_efi_log_format_64_t *src_efi_fmt_64 =
			(xfs_efi_log_format_64_t *)buf->i_addr;

		dst_efi_fmt->efi_type     = src_efi_fmt_64->efi_type;
		dst_efi_fmt->efi_size     = src_efi_fmt_64->efi_size;
		dst_efi_fmt->efi_nextents = src_efi_fmt_64->efi_nextents;
		dst_efi_fmt->efi_id       = src_efi_fmt_64->efi_id;
		for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
			dst_efi_fmt->efi_extents[i].ext_start =
				src_efi_fmt_64->efi_extents[i].ext_start;
			dst_efi_fmt->efi_extents[i].ext_len =
				src_efi_fmt_64->efi_extents[i].ext_len;
		}
		return 0;
	}
	return EFSCORRUPTED;
}

/*
 * This is called by the efd item code below to release references to
 * the given efi item.  Each efd calls this with the number of
 * extents that it has logged, and when the sum of these reaches
 * the total number of extents logged by this efi item we can free
 * the efi item.
 *
 * Freeing the efi item requires that we remove it from the AIL.
 * We'll use the AIL lock to protect our counters as well as
 * the removal from the AIL.
 */
void
xfs_efi_release(xfs_efi_log_item_t	*efip,
		uint			nextents)
{
	xfs_mount_t	*mp;
	int		extents_left;
	SPLDECL(s);

	mp = efip->efi_item.li_mountp;
	ASSERT(efip->efi_next_extent > 0);
	ASSERT(efip->efi_flags & XFS_EFI_COMMITTED);

	AIL_LOCK(mp, s);
	ASSERT(efip->efi_next_extent >= nextents);
	efip->efi_next_extent -= nextents;
	extents_left = efip->efi_next_extent;
	if (extents_left == 0) {
		/*
		 * xfs_trans_delete_ail() drops the AIL lock.
		 */
		xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
		xfs_efi_item_free(efip);
	} else {
		AIL_UNLOCK(mp, s);
	}
}

/*
 * This is called when the transaction that should be committing the
 * EFD corresponding to the given EFI is aborted.  The committed and
 * canceled flags are used to coordinate the freeing of the EFI and
 * the references by the transaction that committed it.
 */
STATIC void
xfs_efi_cancel(
	xfs_efi_log_item_t	*efip)
{
	xfs_mount_t	*mp;
	SPLDECL(s);

	mp = efip->efi_item.li_mountp;
	AIL_LOCK(mp, s);
	if (efip->efi_flags & XFS_EFI_COMMITTED) {
		/*
		 * xfs_trans_delete_ail() drops the AIL lock.
		 */
		xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
		xfs_efi_item_free(efip);
	} else {
		efip->efi_flags |= XFS_EFI_CANCELED;
		AIL_UNLOCK(mp, s);
	}
}

STATIC void
xfs_efd_item_free(xfs_efd_log_item_t *efdp)
{
	int nexts = efdp->efd_format.efd_nextents;

	if (nexts > XFS_EFD_MAX_FAST_EXTENTS) {
		kmem_free(efdp, sizeof(xfs_efd_log_item_t) +
				(nexts - 1) * sizeof(xfs_extent_t));
	} else {
		kmem_zone_free(xfs_efd_zone, efdp);
	}
}

/*
 * This returns the number of iovecs needed to log the given efd item.
 * We only need 1 iovec for an efd item.  It just logs the efd_log_format
 * structure.
 */
/*ARGSUSED*/
STATIC uint
xfs_efd_item_size(xfs_efd_log_item_t *efdp)
{
	return 1;
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given efd log item. We use only 1 iovec, and we point that
 * at the efd_log_format structure embedded in the efd item.
 * It is at this point that we assert that all of the extent
 * slots in the efd item have been filled.
 */
STATIC void
xfs_efd_item_format(xfs_efd_log_item_t	*efdp,
		    xfs_log_iovec_t	*log_vector)
{
	uint	size;

	ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents);

	efdp->efd_format.efd_type = XFS_LI_EFD;

	size = sizeof(xfs_efd_log_format_t);
	size += (efdp->efd_format.efd_nextents - 1) * sizeof(xfs_extent_t);
	efdp->efd_format.efd_size = 1;

	log_vector->i_addr = (xfs_caddr_t)&(efdp->efd_format);
	log_vector->i_len = size;
	XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_EFD_FORMAT);
	ASSERT(size >= sizeof(xfs_efd_log_format_t));
}


/*
 * Pinning has no meaning for an efd item, so just return.
 */
/*ARGSUSED*/
STATIC void
xfs_efd_item_pin(xfs_efd_log_item_t *efdp)
{
	return;
}


/*
 * Since pinning has no meaning for an efd item, unpinning does
 * not either.
 */
/*ARGSUSED*/
STATIC void
xfs_efd_item_unpin(xfs_efd_log_item_t *efdp, int stale)
{
	return;
}

/*ARGSUSED*/
STATIC void
xfs_efd_item_unpin_remove(xfs_efd_log_item_t *efdp, xfs_trans_t *tp)
{
	return;
}

/*
 * Efd items have no locking, so just return success.
 */
/*ARGSUSED*/
STATIC uint
xfs_efd_item_trylock(xfs_efd_log_item_t *efdp)
{
	return XFS_ITEM_LOCKED;
}

/*
 * Efd items have no locking or pushing, so return failure
 * so that the caller doesn't bother with us.
 */
/*ARGSUSED*/
STATIC void
xfs_efd_item_unlock(xfs_efd_log_item_t *efdp)
{
	if (efdp->efd_item.li_flags & XFS_LI_ABORTED)
		xfs_efd_item_abort(efdp);
	return;
}

/*
 * When the efd item is committed to disk, all we need to do
 * is delete our reference to our partner efi item and then
 * free ourselves.  Since we're freeing ourselves we must
 * return -1 to keep the transaction code from further referencing
 * this item.
 */
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_efd_item_committed(xfs_efd_log_item_t *efdp, xfs_lsn_t lsn)
{
	/*
	 * If we got a log I/O error, it's always the case that the LR with the
	 * EFI got unpinned and freed before the EFD got aborted.
	 */
	if ((efdp->efd_item.li_flags & XFS_LI_ABORTED) == 0)
		xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents);

	xfs_efd_item_free(efdp);
	return (xfs_lsn_t)-1;
}

/*
 * The transaction of which this EFD is a part has been aborted.
 * Inform its companion EFI of this fact and then clean up after
 * ourselves.  No need to clean up the slot for the item in the
 * transaction.  That was done by the unpin code which is called
 * prior to this routine in the abort/fs-shutdown path.
 */
STATIC void
xfs_efd_item_abort(xfs_efd_log_item_t *efdp)
{
	/*
	 * If we got a log I/O error, it's always the case that the LR with the
	 * EFI got unpinned and freed before the EFD got aborted. So don't
	 * reference the EFI at all in that case.
	 */
	if ((efdp->efd_item.li_flags & XFS_LI_ABORTED) == 0)
		xfs_efi_cancel(efdp->efd_efip);

	xfs_efd_item_free(efdp);
}

/*
 * There isn't much you can do to push on an efd item.  It is simply
 * stuck waiting for the log to be flushed to disk.
 */
/*ARGSUSED*/
STATIC void
xfs_efd_item_push(xfs_efd_log_item_t *efdp)
{
	return;
}

/*
 * The EFD dependency tracking op doesn't do squat.  It can't because
 * it doesn't know where the free extent is coming from.  The dependency
 * tracking has to be handled by the "enclosing" metadata object.  For
 * example, for inodes, the inode is locked throughout the extent freeing
 * so the dependency should be recorded there.
 */
/*ARGSUSED*/
STATIC void
xfs_efd_item_committing(xfs_efd_log_item_t *efip, xfs_lsn_t lsn)
{
	return;
}

/*
 * This is the ops vector shared by all efd log items.
 */
STATIC struct xfs_item_ops xfs_efd_item_ops = {
	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_efd_item_size,
	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
					xfs_efd_item_format,
	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_efd_item_pin,
	.iop_unpin	= (void(*)(xfs_log_item_t*, int))xfs_efd_item_unpin,
	.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
					xfs_efd_item_unpin_remove,
	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_efd_item_trylock,
	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_efd_item_unlock,
	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_efd_item_committed,
	.iop_push	= (void(*)(xfs_log_item_t*))xfs_efd_item_push,
	.iop_abort	= (void(*)(xfs_log_item_t*))xfs_efd_item_abort,
	.iop_pushbuf	= NULL,
	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_efd_item_committing
};


/*
 * Allocate and initialize an efd item with the given number of extents.
 */
xfs_efd_log_item_t *
xfs_efd_init(xfs_mount_t	*mp,
	     xfs_efi_log_item_t	*efip,
	     uint		nextents)

{
	xfs_efd_log_item_t	*efdp;
	uint			size;

	ASSERT(nextents > 0);
	if (nextents > XFS_EFD_MAX_FAST_EXTENTS) {
		size = (uint)(sizeof(xfs_efd_log_item_t) +
			((nextents - 1) * sizeof(xfs_extent_t)));
		efdp = (xfs_efd_log_item_t*)kmem_zalloc(size, KM_SLEEP);
	} else {
		efdp = (xfs_efd_log_item_t*)kmem_zone_zalloc(xfs_efd_zone,
							     KM_SLEEP);
	}

	efdp->efd_item.li_type = XFS_LI_EFD;
	efdp->efd_item.li_ops = &xfs_efd_item_ops;
	efdp->efd_item.li_mountp = mp;
	efdp->efd_efip = efip;
	efdp->efd_format.efd_nextents = nextents;
	efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;

	return (efdp);
}