Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 3627 deletions

diff --git a/ANDROID_3.4.5/fs/xfs/xfs_log.c b/ANDROID_3.4.5/fs/xfs/xfs_log.c
deleted file mode 100644
index 6db1fef3..00000000
--- a/ANDROID_3.4.5/fs/xfs/xfs_log.c
+++ /dev/null
@@ -1,3627 +0,0 @@
-/*
- * Copyright (c) 2000-2005 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_error.h"
-#include "xfs_log_priv.h"
-#include "xfs_buf_item.h"
-#include "xfs_bmap_btree.h"
-#include "xfs_alloc_btree.h"
-#include "xfs_ialloc_btree.h"
-#include "xfs_log_recover.h"
-#include "xfs_trans_priv.h"
-#include "xfs_dinode.h"
-#include "xfs_inode.h"
-#include "xfs_rw.h"
-#include "xfs_trace.h"
-
-kmem_zone_t	*xfs_log_ticket_zone;
-
-/* Local miscellaneous function prototypes */
-STATIC int	 xlog_commit_record(struct log *log, struct xlog_ticket *ticket,
-				    xlog_in_core_t **, xfs_lsn_t *);
-STATIC xlog_t *  xlog_alloc_log(xfs_mount_t	*mp,
-				xfs_buftarg_t	*log_target,
-				xfs_daddr_t	blk_offset,
-				int		num_bblks);
-STATIC int	 xlog_space_left(struct log *log, atomic64_t *head);
-STATIC int	 xlog_sync(xlog_t *log, xlog_in_core_t *iclog);
-STATIC void	 xlog_dealloc_log(xlog_t *log);
-
-/* local state machine functions */
-STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int);
-STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog);
-STATIC int  xlog_state_get_iclog_space(xlog_t		*log,
-				       int		len,
-				       xlog_in_core_t	**iclog,
-				       xlog_ticket_t	*ticket,
-				       int		*continued_write,
-				       int		*logoffsetp);
-STATIC int  xlog_state_release_iclog(xlog_t		*log,
-				     xlog_in_core_t	*iclog);
-STATIC void xlog_state_switch_iclogs(xlog_t		*log,
-				     xlog_in_core_t *iclog,
-				     int		eventual_size);
-STATIC void xlog_state_want_sync(xlog_t	*log, xlog_in_core_t *iclog);
-
-STATIC void xlog_grant_push_ail(struct log	*log,
-				int		need_bytes);
-STATIC void xlog_regrant_reserve_log_space(xlog_t	 *log,
-					   xlog_ticket_t *ticket);
-STATIC void xlog_ungrant_log_space(xlog_t	 *log,
-				   xlog_ticket_t *ticket);
-
-#if defined(DEBUG)
-STATIC void	xlog_verify_dest_ptr(xlog_t *log, char *ptr);
-STATIC void	xlog_verify_grant_tail(struct log *log);
-STATIC void	xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog,
-				  int count, boolean_t syncing);
-STATIC void	xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
-				     xfs_lsn_t tail_lsn);
-#else
-#define xlog_verify_dest_ptr(a,b)
-#define xlog_verify_grant_tail(a)
-#define xlog_verify_iclog(a,b,c,d)
-#define xlog_verify_tail_lsn(a,b,c)
-#endif
-
-STATIC int	xlog_iclogs_empty(xlog_t *log);
-
-static void
-xlog_grant_sub_space(
-	struct log	*log,
-	atomic64_t	*head,
-	int		bytes)
-{
-	int64_t	head_val = atomic64_read(head);
-	int64_t new, old;
-
-	do {
-		int	cycle, space;
-
-		xlog_crack_grant_head_val(head_val, &cycle, &space);
-
-		space -= bytes;
-		if (space < 0) {
-			space += log->l_logsize;
-			cycle--;
-		}
-
-		old = head_val;
-		new = xlog_assign_grant_head_val(cycle, space);
-		head_val = atomic64_cmpxchg(head, old, new);
-	} while (head_val != old);
-}
-
-static void
-xlog_grant_add_space(
-	struct log	*log,
-	atomic64_t	*head,
-	int		bytes)
-{
-	int64_t	head_val = atomic64_read(head);
-	int64_t new, old;
-
-	do {
-		int		tmp;
-		int		cycle, space;
-
-		xlog_crack_grant_head_val(head_val, &cycle, &space);
-
-		tmp = log->l_logsize - space;
-		if (tmp > bytes)
-			space += bytes;
-		else {
-			space = bytes - tmp;
-			cycle++;
-		}
-
-		old = head_val;
-		new = xlog_assign_grant_head_val(cycle, space);
-		head_val = atomic64_cmpxchg(head, old, new);
-	} while (head_val != old);
-}
-
-STATIC void
-xlog_grant_head_init(
-	struct xlog_grant_head	*head)
-{
-	xlog_assign_grant_head(&head->grant, 1, 0);
-	INIT_LIST_HEAD(&head->waiters);
-	spin_lock_init(&head->lock);
-}
-
-STATIC void
-xlog_grant_head_wake_all(
-	struct xlog_grant_head	*head)
-{
-	struct xlog_ticket	*tic;
-
-	spin_lock(&head->lock);
-	list_for_each_entry(tic, &head->waiters, t_queue)
-		wake_up_process(tic->t_task);
-	spin_unlock(&head->lock);
-}
-
-static inline int
-xlog_ticket_reservation(
-	struct log		*log,
-	struct xlog_grant_head	*head,
-	struct xlog_ticket	*tic)
-{
-	if (head == &log->l_write_head) {
-		ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
-		return tic->t_unit_res;
-	} else {
-		if (tic->t_flags & XLOG_TIC_PERM_RESERV)
-			return tic->t_unit_res * tic->t_cnt;
-		else
-			return tic->t_unit_res;
-	}
-}
-
-STATIC bool
-xlog_grant_head_wake(
-	struct log		*log,
-	struct xlog_grant_head	*head,
-	int			*free_bytes)
-{
-	struct xlog_ticket	*tic;
-	int			need_bytes;
-
-	list_for_each_entry(tic, &head->waiters, t_queue) {
-		need_bytes = xlog_ticket_reservation(log, head, tic);
-		if (*free_bytes < need_bytes)
-			return false;
-
-		*free_bytes -= need_bytes;
-		trace_xfs_log_grant_wake_up(log, tic);
-		wake_up_process(tic->t_task);
-	}
-
-	return true;
-}
-
-STATIC int
-xlog_grant_head_wait(
-	struct log		*log,
-	struct xlog_grant_head	*head,
-	struct xlog_ticket	*tic,
-	int			need_bytes)
-{
-	list_add_tail(&tic->t_queue, &head->waiters);
-
-	do {
-		if (XLOG_FORCED_SHUTDOWN(log))
-			goto shutdown;
-		xlog_grant_push_ail(log, need_bytes);
-
-		__set_current_state(TASK_UNINTERRUPTIBLE);
-		spin_unlock(&head->lock);
-
-		XFS_STATS_INC(xs_sleep_logspace);
-
-		trace_xfs_log_grant_sleep(log, tic);
-		schedule();
-		trace_xfs_log_grant_wake(log, tic);
-
-		spin_lock(&head->lock);
-		if (XLOG_FORCED_SHUTDOWN(log))
-			goto shutdown;
-	} while (xlog_space_left(log, &head->grant) < need_bytes);
-
-	list_del_init(&tic->t_queue);
-	return 0;
-shutdown:
-	list_del_init(&tic->t_queue);
-	return XFS_ERROR(EIO);
-}
-
-/*
- * Atomically get the log space required for a log ticket.
- *
- * Once a ticket gets put onto head->waiters, it will only return after the
- * needed reservation is satisfied.
- *
- * This function is structured so that it has a lock free fast path. This is
- * necessary because every new transaction reservation will come through this
- * path. Hence any lock will be globally hot if we take it unconditionally on
- * every pass.
- *
- * As tickets are only ever moved on and off head->waiters under head->lock, we
- * only need to take that lock if we are going to add the ticket to the queue
- * and sleep. We can avoid taking the lock if the ticket was never added to
- * head->waiters because the t_queue list head will be empty and we hold the
- * only reference to it so it can safely be checked unlocked.
- */
-STATIC int
-xlog_grant_head_check(
-	struct log		*log,
-	struct xlog_grant_head	*head,
-	struct xlog_ticket	*tic,
-	int			*need_bytes)
-{
-	int			free_bytes;
-	int			error = 0;
-
-	ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY));
-
-	/*
-	 * If there are other waiters on the queue then give them a chance at
-	 * logspace before us.  Wake up the first waiters, if we do not wake
-	 * up all the waiters then go to sleep waiting for more free space,
-	 * otherwise try to get some space for this transaction.
-	 */
-	*need_bytes = xlog_ticket_reservation(log, head, tic);
-	free_bytes = xlog_space_left(log, &head->grant);
-	if (!list_empty_careful(&head->waiters)) {
-		spin_lock(&head->lock);
-		if (!xlog_grant_head_wake(log, head, &free_bytes) ||
-		    free_bytes < *need_bytes) {
-			error = xlog_grant_head_wait(log, head, tic,
-						     *need_bytes);
-		}
-		spin_unlock(&head->lock);
-	} else if (free_bytes < *need_bytes) {
-		spin_lock(&head->lock);
-		error = xlog_grant_head_wait(log, head, tic, *need_bytes);
-		spin_unlock(&head->lock);
-	}
-
-	return error;
-}
-
-static void
-xlog_tic_reset_res(xlog_ticket_t *tic)
-{
-	tic->t_res_num = 0;
-	tic->t_res_arr_sum = 0;
-	tic->t_res_num_ophdrs = 0;
-}
-
-static void
-xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type)
-{
-	if (tic->t_res_num == XLOG_TIC_LEN_MAX) {
-		/* add to overflow and start again */
-		tic->t_res_o_flow += tic->t_res_arr_sum;
-		tic->t_res_num = 0;
-		tic->t_res_arr_sum = 0;
-	}
-
-	tic->t_res_arr[tic->t_res_num].r_len = len;
-	tic->t_res_arr[tic->t_res_num].r_type = type;
-	tic->t_res_arr_sum += len;
-	tic->t_res_num++;
-}
-
-/*
- * Replenish the byte reservation required by moving the grant write head.
- */
-int
-xfs_log_regrant(
-	struct xfs_mount	*mp,
-	struct xlog_ticket	*tic)
-{
-	struct log		*log = mp->m_log;
-	int			need_bytes;
-	int			error = 0;
-
-	if (XLOG_FORCED_SHUTDOWN(log))
-		return XFS_ERROR(EIO);
-
-	XFS_STATS_INC(xs_try_logspace);
-
-	/*
-	 * This is a new transaction on the ticket, so we need to change the
-	 * transaction ID so that the next transaction has a different TID in
-	 * the log. Just add one to the existing tid so that we can see chains
-	 * of rolling transactions in the log easily.
-	 */
-	tic->t_tid++;
-
-	xlog_grant_push_ail(log, tic->t_unit_res);
-
-	tic->t_curr_res = tic->t_unit_res;
-	xlog_tic_reset_res(tic);
-
-	if (tic->t_cnt > 0)
-		return 0;
-
-	trace_xfs_log_regrant(log, tic);
-
-	error = xlog_grant_head_check(log, &log->l_write_head, tic,
-				      &need_bytes);
-	if (error)
-		goto out_error;
-
-	xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes);
-	trace_xfs_log_regrant_exit(log, tic);
-	xlog_verify_grant_tail(log);
-	return 0;
-
-out_error:
-	/*
-	 * If we are failing, make sure the ticket doesn't have any current
-	 * reservations.  We don't want to add this back when the ticket/
-	 * transaction gets cancelled.
-	 */
-	tic->t_curr_res = 0;
-	tic->t_cnt = 0;	/* ungrant will give back unit_res * t_cnt. */
-	return error;
-}
-
-/*
- * Reserve log space and return a ticket corresponding the reservation.
- *
- * Each reservation is going to reserve extra space for a log record header.
- * When writes happen to the on-disk log, we don't subtract the length of the
- * log record header from any reservation.  By wasting space in each
- * reservation, we prevent over allocation problems.
- */
-int
-xfs_log_reserve(
-	struct xfs_mount	*mp,
-	int		 	unit_bytes,
-	int		 	cnt,
-	struct xlog_ticket	**ticp,
-	__uint8_t	 	client,
-	bool			permanent,
-	uint		 	t_type)
-{
-	struct log		*log = mp->m_log;
-	struct xlog_ticket	*tic;
-	int			need_bytes;
-	int			error = 0;
-
-	ASSERT(client == XFS_TRANSACTION || client == XFS_LOG);
-
-	if (XLOG_FORCED_SHUTDOWN(log))
-		return XFS_ERROR(EIO);
-
-	XFS_STATS_INC(xs_try_logspace);
-
-	ASSERT(*ticp == NULL);
-	tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent,
-				KM_SLEEP | KM_MAYFAIL);
-	if (!tic)
-		return XFS_ERROR(ENOMEM);
-
-	tic->t_trans_type = t_type;
-	*ticp = tic;
-
-	xlog_grant_push_ail(log, tic->t_unit_res * tic->t_cnt);
-
-	trace_xfs_log_reserve(log, tic);
-
-	error = xlog_grant_head_check(log, &log->l_reserve_head, tic,
-				      &need_bytes);
-	if (error)
-		goto out_error;
-
-	xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes);
-	xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes);
-	trace_xfs_log_reserve_exit(log, tic);
-	xlog_verify_grant_tail(log);
-	return 0;
-
-out_error:
-	/*
-	 * If we are failing, make sure the ticket doesn't have any current
-	 * reservations.  We don't want to add this back when the ticket/
-	 * transaction gets cancelled.
-	 */
-	tic->t_curr_res = 0;
-	tic->t_cnt = 0;	/* ungrant will give back unit_res * t_cnt. */
-	return error;
-}
-
-
-/*
- * NOTES:
- *
- *	1. currblock field gets updated at startup and after in-core logs
- *		marked as with WANT_SYNC.
- */
-
-/*
- * This routine is called when a user of a log manager ticket is done with
- * the reservation.  If the ticket was ever used, then a commit record for
- * the associated transaction is written out as a log operation header with
- * no data.  The flag XLOG_TIC_INITED is set when the first write occurs with
- * a given ticket.  If the ticket was one with a permanent reservation, then
- * a few operations are done differently.  Permanent reservation tickets by
- * default don't release the reservation.  They just commit the current
- * transaction with the belief that the reservation is still needed.  A flag
- * must be passed in before permanent reservations are actually released.
- * When these type of tickets are not released, they need to be set into
- * the inited state again.  By doing this, a start record will be written
- * out when the next write occurs.
- */
-xfs_lsn_t
-xfs_log_done(
-	struct xfs_mount	*mp,
-	struct xlog_ticket	*ticket,
-	struct xlog_in_core	**iclog,
-	uint			flags)
-{
-	struct log		*log = mp->m_log;
-	xfs_lsn_t		lsn = 0;
-
-	if (XLOG_FORCED_SHUTDOWN(log) ||
-	    /*
-	     * If nothing was ever written, don't write out commit record.
-	     * If we get an error, just continue and give back the log ticket.
-	     */
-	    (((ticket->t_flags & XLOG_TIC_INITED) == 0) &&
-	     (xlog_commit_record(log, ticket, iclog, &lsn)))) {
-		lsn = (xfs_lsn_t) -1;
-		if (ticket->t_flags & XLOG_TIC_PERM_RESERV) {
-			flags |= XFS_LOG_REL_PERM_RESERV;
-		}
-	}
-
-
-	if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 ||
-	    (flags & XFS_LOG_REL_PERM_RESERV)) {
-		trace_xfs_log_done_nonperm(log, ticket);
-
-		/*
-		 * Release ticket if not permanent reservation or a specific
-		 * request has been made to release a permanent reservation.
-		 */
-		xlog_ungrant_log_space(log, ticket);
-		xfs_log_ticket_put(ticket);
-	} else {
-		trace_xfs_log_done_perm(log, ticket);
-
-		xlog_regrant_reserve_log_space(log, ticket);
-		/* If this ticket was a permanent reservation and we aren't
-		 * trying to release it, reset the inited flags; so next time
-		 * we write, a start record will be written out.
-		 */
-		ticket->t_flags |= XLOG_TIC_INITED;
-	}
-
-	return lsn;
-}
-
-/*
- * Attaches a new iclog I/O completion callback routine during
- * transaction commit.  If the log is in error state, a non-zero
- * return code is handed back and the caller is responsible for
- * executing the callback at an appropriate time.
- */
-int
-xfs_log_notify(
-	struct xfs_mount	*mp,
-	struct xlog_in_core	*iclog,
-	xfs_log_callback_t	*cb)
-{
-	int	abortflg;
-
-	spin_lock(&iclog->ic_callback_lock);
-	abortflg = (iclog->ic_state & XLOG_STATE_IOERROR);
-	if (!abortflg) {
-		ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) ||
-			      (iclog->ic_state == XLOG_STATE_WANT_SYNC));
-		cb->cb_next = NULL;
-		*(iclog->ic_callback_tail) = cb;
-		iclog->ic_callback_tail = &(cb->cb_next);
-	}
-	spin_unlock(&iclog->ic_callback_lock);
-	return abortflg;
-}
-
-int
-xfs_log_release_iclog(
-	struct xfs_mount	*mp,
-	struct xlog_in_core	*iclog)
-{
-	if (xlog_state_release_iclog(mp->m_log, iclog)) {
-		xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
-		return EIO;
-	}
-
-	return 0;
-}
-
-/*
- * Mount a log filesystem
- *
- * mp		- ubiquitous xfs mount point structure
- * log_target	- buftarg of on-disk log device
- * blk_offset	- Start block # where block size is 512 bytes (BBSIZE)
- * num_bblocks	- Number of BBSIZE blocks in on-disk log
- *
- * Return error or zero.
- */
-int
-xfs_log_mount(
-	xfs_mount_t	*mp,
-	xfs_buftarg_t	*log_target,
-	xfs_daddr_t	blk_offset,
-	int		num_bblks)
-{
-	int		error;
-
-	if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
-		xfs_notice(mp, "Mounting Filesystem");
-	else {
-		xfs_notice(mp,
-"Mounting filesystem in no-recovery mode.  Filesystem will be inconsistent.");
-		ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
-	}
-
-	mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks);
-	if (IS_ERR(mp->m_log)) {
-		error = -PTR_ERR(mp->m_log);
-		goto out;
-	}
-
-	/*
-	 * Initialize the AIL now we have a log.
-	 */
-	error = xfs_trans_ail_init(mp);
-	if (error) {
-		xfs_warn(mp, "AIL initialisation failed: error %d", error);
-		goto out_free_log;
-	}
-	mp->m_log->l_ailp = mp->m_ail;
-
-	/*
-	 * skip log recovery on a norecovery mount.  pretend it all
-	 * just worked.
-	 */
-	if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) {
-		int	readonly = (mp->m_flags & XFS_MOUNT_RDONLY);
-
-		if (readonly)
-			mp->m_flags &= ~XFS_MOUNT_RDONLY;
-
-		error = xlog_recover(mp->m_log);
-
-		if (readonly)
-			mp->m_flags |= XFS_MOUNT_RDONLY;
-		if (error) {
-			xfs_warn(mp, "log mount/recovery failed: error %d",
-				error);
-			goto out_destroy_ail;
-		}
-	}
-
-	/* Normal transactions can now occur */
-	mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
-
-	/*
-	 * Now the log has been fully initialised and we know were our
-	 * space grant counters are, we can initialise the permanent ticket
-	 * needed for delayed logging to work.
-	 */
-	xlog_cil_init_post_recovery(mp->m_log);
-
-	return 0;
-
-out_destroy_ail:
-	xfs_trans_ail_destroy(mp);
-out_free_log:
-	xlog_dealloc_log(mp->m_log);
-out:
-	return error;
-}
-
-/*
- * Finish the recovery of the file system.  This is separate from
- * the xfs_log_mount() call, because it depends on the code in
- * xfs_mountfs() to read in the root and real-time bitmap inodes
- * between calling xfs_log_mount() and here.
- *
- * mp		- ubiquitous xfs mount point structure
- */
-int
-xfs_log_mount_finish(xfs_mount_t *mp)
-{
-	int	error;
-
-	if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
-		error = xlog_recover_finish(mp->m_log);
-	else {
-		error = 0;
-		ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
-	}
-
-	return error;
-}
-
-/*
- * Final log writes as part of unmount.
- *
- * Mark the filesystem clean as unmount happens.  Note that during relocation
- * this routine needs to be executed as part of source-bag while the
- * deallocation must not be done until source-end.
- */
-
-/*
- * Unmount record used to have a string "Unmount filesystem--" in the
- * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE).
- * We just write the magic number now since that particular field isn't
- * currently architecture converted and "nUmount" is a bit foo.
- * As far as I know, there weren't any dependencies on the old behaviour.
- */
-
-int
-xfs_log_unmount_write(xfs_mount_t *mp)
-{
-	xlog_t		 *log = mp->m_log;
-	xlog_in_core_t	 *iclog;
-#ifdef DEBUG
-	xlog_in_core_t	 *first_iclog;
-#endif
-	xlog_ticket_t	*tic = NULL;
-	xfs_lsn_t	 lsn;
-	int		 error;
-
-	/*
-	 * Don't write out unmount record on read-only mounts.
-	 * Or, if we are doing a forced umount (typically because of IO errors).
-	 */
-	if (mp->m_flags & XFS_MOUNT_RDONLY)
-		return 0;
-
-	error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL);
-	ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log)));
-
-#ifdef DEBUG
-	first_iclog = iclog = log->l_iclog;
-	do {
-		if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
-			ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE);
-			ASSERT(iclog->ic_offset == 0);
-		}
-		iclog = iclog->ic_next;
-	} while (iclog != first_iclog);
-#endif
-	if (! (XLOG_FORCED_SHUTDOWN(log))) {
-		error = xfs_log_reserve(mp, 600, 1, &tic,
-					XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE);
-		if (!error) {
-			/* the data section must be 32 bit size aligned */
-			struct {
-			    __uint16_t magic;
-			    __uint16_t pad1;
-			    __uint32_t pad2; /* may as well make it 64 bits */
-			} magic = {
-				.magic = XLOG_UNMOUNT_TYPE,
-			};
-			struct xfs_log_iovec reg = {
-				.i_addr = &magic,
-				.i_len = sizeof(magic),
-				.i_type = XLOG_REG_TYPE_UNMOUNT,
-			};
-			struct xfs_log_vec vec = {
-				.lv_niovecs = 1,
-				.lv_iovecp = &reg,
-			};
-
-			/* remove inited flag, and account for space used */
-			tic->t_flags = 0;
-			tic->t_curr_res -= sizeof(magic);
-			error = xlog_write(log, &vec, tic, &lsn,
-					   NULL, XLOG_UNMOUNT_TRANS);
-			/*
-			 * At this point, we're umounting anyway,
-			 * so there's no point in transitioning log state
-			 * to IOERROR. Just continue...
-			 */
-		}
-
-		if (error)
-			xfs_alert(mp, "%s: unmount record failed", __func__);
-
-
-		spin_lock(&log->l_icloglock);
-		iclog = log->l_iclog;
-		atomic_inc(&iclog->ic_refcnt);
-		xlog_state_want_sync(log, iclog);
-		spin_unlock(&log->l_icloglock);
-		error = xlog_state_release_iclog(log, iclog);
-
-		spin_lock(&log->l_icloglock);
-		if (!(iclog->ic_state == XLOG_STATE_ACTIVE ||
-		      iclog->ic_state == XLOG_STATE_DIRTY)) {
-			if (!XLOG_FORCED_SHUTDOWN(log)) {
-				xlog_wait(&iclog->ic_force_wait,
-							&log->l_icloglock);
-			} else {
-				spin_unlock(&log->l_icloglock);
-			}
-		} else {
-			spin_unlock(&log->l_icloglock);
-		}
-		if (tic) {
-			trace_xfs_log_umount_write(log, tic);
-			xlog_ungrant_log_space(log, tic);
-			xfs_log_ticket_put(tic);
-		}
-	} else {
-		/*
-		 * We're already in forced_shutdown mode, couldn't
-		 * even attempt to write out the unmount transaction.
-		 *
-		 * Go through the motions of sync'ing and releasing
-		 * the iclog, even though no I/O will actually happen,
-		 * we need to wait for other log I/Os that may already
-		 * be in progress.  Do this as a separate section of
-		 * code so we'll know if we ever get stuck here that
-		 * we're in this odd situation of trying to unmount
-		 * a file system that went into forced_shutdown as
-		 * the result of an unmount..
-		 */
-		spin_lock(&log->l_icloglock);
-		iclog = log->l_iclog;
-		atomic_inc(&iclog->ic_refcnt);
-
-		xlog_state_want_sync(log, iclog);
-		spin_unlock(&log->l_icloglock);
-		error =  xlog_state_release_iclog(log, iclog);
-
-		spin_lock(&log->l_icloglock);
-
-		if ( ! (   iclog->ic_state == XLOG_STATE_ACTIVE
-			|| iclog->ic_state == XLOG_STATE_DIRTY
-			|| iclog->ic_state == XLOG_STATE_IOERROR) ) {
-
-				xlog_wait(&iclog->ic_force_wait,
-							&log->l_icloglock);
-		} else {
-			spin_unlock(&log->l_icloglock);
-		}
-	}
-
-	return error;
-}	/* xfs_log_unmount_write */
-
-/*
- * Deallocate log structures for unmount/relocation.
- *
- * We need to stop the aild from running before we destroy
- * and deallocate the log as the aild references the log.
- */
-void
-xfs_log_unmount(xfs_mount_t *mp)
-{
-	xfs_trans_ail_destroy(mp);
-	xlog_dealloc_log(mp->m_log);
-}
-
-void
-xfs_log_item_init(
-	struct xfs_mount	*mp,
-	struct xfs_log_item	*item,
-	int			type,
-	const struct xfs_item_ops *ops)
-{
-	item->li_mountp = mp;
-	item->li_ailp = mp->m_ail;
-	item->li_type = type;
-	item->li_ops = ops;
-	item->li_lv = NULL;
-
-	INIT_LIST_HEAD(&item->li_ail);
-	INIT_LIST_HEAD(&item->li_cil);
-}
-
-/*
- * Wake up processes waiting for log space after we have moved the log tail.
- */
-void
-xfs_log_space_wake(
-	struct xfs_mount	*mp)
-{
-	struct log		*log = mp->m_log;
-	int			free_bytes;
-
-	if (XLOG_FORCED_SHUTDOWN(log))
-		return;
-
-	if (!list_empty_careful(&log->l_write_head.waiters)) {
-		ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY));
-
-		spin_lock(&log->l_write_head.lock);
-		free_bytes = xlog_space_left(log, &log->l_write_head.grant);
-		xlog_grant_head_wake(log, &log->l_write_head, &free_bytes);
-		spin_unlock(&log->l_write_head.lock);
-	}
-
-	if (!list_empty_careful(&log->l_reserve_head.waiters)) {
-		ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY));
-
-		spin_lock(&log->l_reserve_head.lock);
-		free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
-		xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes);
-		spin_unlock(&log->l_reserve_head.lock);
-	}
-}
-
-/*
- * Determine if we have a transaction that has gone to disk
- * that needs to be covered. To begin the transition to the idle state
- * firstly the log needs to be idle (no AIL and nothing in the iclogs).
- * If we are then in a state where covering is needed, the caller is informed
- * that dummy transactions are required to move the log into the idle state.
- *
- * Because this is called as part of the sync process, we should also indicate
- * that dummy transactions should be issued in anything but the covered or
- * idle states. This ensures that the log tail is accurately reflected in
- * the log at the end of the sync, hence if a crash occurrs avoids replay
- * of transactions where the metadata is already on disk.
- */
-int
-xfs_log_need_covered(xfs_mount_t *mp)
-{
-	int		needed = 0;
-	xlog_t		*log = mp->m_log;
-
-	if (!xfs_fs_writable(mp))
-		return 0;
-
-	spin_lock(&log->l_icloglock);
-	switch (log->l_covered_state) {
-	case XLOG_STATE_COVER_DONE:
-	case XLOG_STATE_COVER_DONE2:
-	case XLOG_STATE_COVER_IDLE:
-		break;
-	case XLOG_STATE_COVER_NEED:
-	case XLOG_STATE_COVER_NEED2:
-		if (!xfs_ail_min_lsn(log->l_ailp) &&
-		    xlog_iclogs_empty(log)) {
-			if (log->l_covered_state == XLOG_STATE_COVER_NEED)
-				log->l_covered_state = XLOG_STATE_COVER_DONE;
-			else
-				log->l_covered_state = XLOG_STATE_COVER_DONE2;
-		}
-		/* FALLTHRU */
-	default:
-		needed = 1;
-		break;
-	}
-	spin_unlock(&log->l_icloglock);
-	return needed;
-}
-
-/*
- * We may be holding the log iclog lock upon entering this routine.
- */
-xfs_lsn_t
-xlog_assign_tail_lsn(
-	struct xfs_mount	*mp)
-{
-	xfs_lsn_t		tail_lsn;
-	struct log		*log = mp->m_log;
-
-	/*
-	 * To make sure we always have a valid LSN for the log tail we keep
-	 * track of the last LSN which was committed in log->l_last_sync_lsn,
-	 * and use that when the AIL was empty and xfs_ail_min_lsn returns 0.
-	 *
-	 * If the AIL has been emptied we also need to wake any process
-	 * waiting for this condition.
-	 */
-	tail_lsn = xfs_ail_min_lsn(mp->m_ail);
-	if (!tail_lsn)
-		tail_lsn = atomic64_read(&log->l_last_sync_lsn);
-	atomic64_set(&log->l_tail_lsn, tail_lsn);
-	return tail_lsn;
-}
-
-/*
- * Return the space in the log between the tail and the head.  The head
- * is passed in the cycle/bytes formal parms.  In the special case where
- * the reserve head has wrapped passed the tail, this calculation is no
- * longer valid.  In this case, just return 0 which means there is no space
- * in the log.  This works for all places where this function is called
- * with the reserve head.  Of course, if the write head were to ever
- * wrap the tail, we should blow up.  Rather than catch this case here,
- * we depend on other ASSERTions in other parts of the code.   XXXmiken
- *
- * This code also handles the case where the reservation head is behind
- * the tail.  The details of this case are described below, but the end
- * result is that we return the size of the log as the amount of space left.
- */
-STATIC int
-xlog_space_left(
-	struct log	*log,
-	atomic64_t	*head)
-{
-	int		free_bytes;
-	int		tail_bytes;
-	int		tail_cycle;
-	int		head_cycle;
-	int		head_bytes;
-
-	xlog_crack_grant_head(head, &head_cycle, &head_bytes);
-	xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes);
-	tail_bytes = BBTOB(tail_bytes);
-	if (tail_cycle == head_cycle && head_bytes >= tail_bytes)
-		free_bytes = log->l_logsize - (head_bytes - tail_bytes);
-	else if (tail_cycle + 1 < head_cycle)
-		return 0;
-	else if (tail_cycle < head_cycle) {
-		ASSERT(tail_cycle == (head_cycle - 1));
-		free_bytes = tail_bytes - head_bytes;
-	} else {
-		/*
-		 * The reservation head is behind the tail.
-		 * In this case we just want to return the size of the
-		 * log as the amount of space left.
-		 */
-		xfs_alert(log->l_mp,
-			"xlog_space_left: head behind tail\n"
-			"  tail_cycle = %d, tail_bytes = %d\n"
-			"  GH   cycle = %d, GH   bytes = %d",
-			tail_cycle, tail_bytes, head_cycle, head_bytes);
-		ASSERT(0);
-		free_bytes = log->l_logsize;
-	}
-	return free_bytes;
-}
-
-
-/*
- * Log function which is called when an io completes.
- *
- * The log manager needs its own routine, in order to control what
- * happens with the buffer after the write completes.
- */
-void
-xlog_iodone(xfs_buf_t *bp)
-{
-	xlog_in_core_t	*iclog = bp->b_fspriv;
-	xlog_t		*l = iclog->ic_log;
-	int		aborted = 0;
-
-	/*
-	 * Race to shutdown the filesystem if we see an error.
-	 */
-	if (XFS_TEST_ERROR((xfs_buf_geterror(bp)), l->l_mp,
-			XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) {
-		xfs_buf_ioerror_alert(bp, __func__);
-		xfs_buf_stale(bp);
-		xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR);
-		/*
-		 * This flag will be propagated to the trans-committed
-		 * callback routines to let them know that the log-commit
-		 * didn't succeed.
-		 */
-		aborted = XFS_LI_ABORTED;
-	} else if (iclog->ic_state & XLOG_STATE_IOERROR) {
-		aborted = XFS_LI_ABORTED;
-	}
-
-	/* log I/O is always issued ASYNC */
-	ASSERT(XFS_BUF_ISASYNC(bp));
-	xlog_state_done_syncing(iclog, aborted);
-	/*
-	 * do not reference the buffer (bp) here as we could race
-	 * with it being freed after writing the unmount record to the
-	 * log.
-	 */
-
-}	/* xlog_iodone */
-
-/*
- * Return size of each in-core log record buffer.
- *
- * All machines get 8 x 32kB buffers by default, unless tuned otherwise.
- *
- * If the filesystem blocksize is too large, we may need to choose a
- * larger size since the directory code currently logs entire blocks.
- */
-
-STATIC void
-xlog_get_iclog_buffer_size(xfs_mount_t	*mp,
-			   xlog_t	*log)
-{
-	int size;
-	int xhdrs;
-
-	if (mp->m_logbufs <= 0)
-		log->l_iclog_bufs = XLOG_MAX_ICLOGS;
-	else
-		log->l_iclog_bufs = mp->m_logbufs;
-
-	/*
-	 * Buffer size passed in from mount system call.
-	 */
-	if (mp->m_logbsize > 0) {
-		size = log->l_iclog_size = mp->m_logbsize;
-		log->l_iclog_size_log = 0;
-		while (size != 1) {
-			log->l_iclog_size_log++;
-			size >>= 1;
-		}
-
-		if (xfs_sb_version_haslogv2(&mp->m_sb)) {
-			/* # headers = size / 32k
-			 * one header holds cycles from 32k of data
-			 */
-
-			xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE;
-			if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE)
-				xhdrs++;
-			log->l_iclog_hsize = xhdrs << BBSHIFT;
-			log->l_iclog_heads = xhdrs;
-		} else {
-			ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE);
-			log->l_iclog_hsize = BBSIZE;
-			log->l_iclog_heads = 1;
-		}
-		goto done;
-	}
-
-	/* All machines use 32kB buffers by default. */
-	log->l_iclog_size = XLOG_BIG_RECORD_BSIZE;
-	log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
-
-	/* the default log size is 16k or 32k which is one header sector */
-	log->l_iclog_hsize = BBSIZE;
-	log->l_iclog_heads = 1;
-
-done:
-	/* are we being asked to make the sizes selected above visible? */
-	if (mp->m_logbufs == 0)
-		mp->m_logbufs = log->l_iclog_bufs;
-	if (mp->m_logbsize == 0)
-		mp->m_logbsize = log->l_iclog_size;
-}	/* xlog_get_iclog_buffer_size */
-
-
-/*
- * This routine initializes some of the log structure for a given mount point.
- * Its primary purpose is to fill in enough, so recovery can occur.  However,
- * some other stuff may be filled in too.
- */
-STATIC xlog_t *
-xlog_alloc_log(xfs_mount_t	*mp,
-	       xfs_buftarg_t	*log_target,
-	       xfs_daddr_t	blk_offset,
-	       int		num_bblks)
-{
-	xlog_t			*log;
-	xlog_rec_header_t	*head;
-	xlog_in_core_t		**iclogp;
-	xlog_in_core_t		*iclog, *prev_iclog=NULL;
-	xfs_buf_t		*bp;
-	int			i;
-	int			error = ENOMEM;
-	uint			log2_size = 0;
-
-	log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL);
-	if (!log) {
-		xfs_warn(mp, "Log allocation failed: No memory!");
-		goto out;
-	}
-
-	log->l_mp	   = mp;
-	log->l_targ	   = log_target;
-	log->l_logsize     = BBTOB(num_bblks);
-	log->l_logBBstart  = blk_offset;
-	log->l_logBBsize   = num_bblks;
-	log->l_covered_state = XLOG_STATE_COVER_IDLE;
-	log->l_flags	   |= XLOG_ACTIVE_RECOVERY;
-
-	log->l_prev_block  = -1;
-	/* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */
-	xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0);
-	xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0);
-	log->l_curr_cycle  = 1;	    /* 0 is bad since this is initial value */
-
-	xlog_grant_head_init(&log->l_reserve_head);
-	xlog_grant_head_init(&log->l_write_head);
-
-	error = EFSCORRUPTED;
-	if (xfs_sb_version_hassector(&mp->m_sb)) {
-	        log2_size = mp->m_sb.sb_logsectlog;
-		if (log2_size < BBSHIFT) {
-			xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)",
-				log2_size, BBSHIFT);
-			goto out_free_log;
-		}
-
-	        log2_size -= BBSHIFT;
-		if (log2_size > mp->m_sectbb_log) {
-			xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)",
-				log2_size, mp->m_sectbb_log);
-			goto out_free_log;
-		}
-
-		/* for larger sector sizes, must have v2 or external log */
-		if (log2_size && log->l_logBBstart > 0 &&
-			    !xfs_sb_version_haslogv2(&mp->m_sb)) {
-			xfs_warn(mp,
-		"log sector size (0x%x) invalid for configuration.",
-				log2_size);
-			goto out_free_log;
-		}
-	}
-	log->l_sectBBsize = 1 << log2_size;
-
-	xlog_get_iclog_buffer_size(mp, log);
-
-	error = ENOMEM;
-	bp = xfs_buf_alloc(mp->m_logdev_targp, 0, log->l_iclog_size, 0);
-	if (!bp)
-		goto out_free_log;
-	bp->b_iodone = xlog_iodone;
-	ASSERT(xfs_buf_islocked(bp));
-	log->l_xbuf = bp;
-
-	spin_lock_init(&log->l_icloglock);
-	init_waitqueue_head(&log->l_flush_wait);
-
-	/* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
-	ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0);
-
-	iclogp = &log->l_iclog;
-	/*
-	 * The amount of memory to allocate for the iclog structure is
-	 * rather funky due to the way the structure is defined.  It is
-	 * done this way so that we can use different sizes for machines
-	 * with different amounts of memory.  See the definition of
-	 * xlog_in_core_t in xfs_log_priv.h for details.
-	 */
-	ASSERT(log->l_iclog_size >= 4096);
-	for (i=0; i < log->l_iclog_bufs; i++) {
-		*iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL);
-		if (!*iclogp)
-			goto out_free_iclog;
-
-		iclog = *iclogp;
-		iclog->ic_prev = prev_iclog;
-		prev_iclog = iclog;
-
-		bp = xfs_buf_get_uncached(mp->m_logdev_targp,
-						log->l_iclog_size, 0);
-		if (!bp)
-			goto out_free_iclog;
-
-		bp->b_iodone = xlog_iodone;
-		iclog->ic_bp = bp;
-		iclog->ic_data = bp->b_addr;
-#ifdef DEBUG
-		log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header);
-#endif
-		head = &iclog->ic_header;
-		memset(head, 0, sizeof(xlog_rec_header_t));
-		head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
-		head->h_version = cpu_to_be32(
-			xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1);
-		head->h_size = cpu_to_be32(log->l_iclog_size);
-		/* new fields */
-		head->h_fmt = cpu_to_be32(XLOG_FMT);
-		memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t));
-
-		iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize;
-		iclog->ic_state = XLOG_STATE_ACTIVE;
-		iclog->ic_log = log;
-		atomic_set(&iclog->ic_refcnt, 0);
-		spin_lock_init(&iclog->ic_callback_lock);
-		iclog->ic_callback_tail = &(iclog->ic_callback);
-		iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize;
-
-		ASSERT(xfs_buf_islocked(iclog->ic_bp));
-		init_waitqueue_head(&iclog->ic_force_wait);
-		init_waitqueue_head(&iclog->ic_write_wait);
-
-		iclogp = &iclog->ic_next;
-	}
-	*iclogp = log->l_iclog;			/* complete ring */
-	log->l_iclog->ic_prev = prev_iclog;	/* re-write 1st prev ptr */
-
-	error = xlog_cil_init(log);
-	if (error)
-		goto out_free_iclog;
-	return log;
-
-out_free_iclog:
-	for (iclog = log->l_iclog; iclog; iclog = prev_iclog) {
-		prev_iclog = iclog->ic_next;
-		if (iclog->ic_bp)
-			xfs_buf_free(iclog->ic_bp);
-		kmem_free(iclog);
-	}
-	spinlock_destroy(&log->l_icloglock);
-	xfs_buf_free(log->l_xbuf);
-out_free_log:
-	kmem_free(log);
-out:
-	return ERR_PTR(-error);
-}	/* xlog_alloc_log */
-
-
-/*
- * Write out the commit record of a transaction associated with the given
- * ticket.  Return the lsn of the commit record.
- */
-STATIC int
-xlog_commit_record(
-	struct log		*log,
-	struct xlog_ticket	*ticket,
-	struct xlog_in_core	**iclog,
-	xfs_lsn_t		*commitlsnp)
-{
-	struct xfs_mount *mp = log->l_mp;
-	int	error;
-	struct xfs_log_iovec reg = {
-		.i_addr = NULL,
-		.i_len = 0,
-		.i_type = XLOG_REG_TYPE_COMMIT,
-	};
-	struct xfs_log_vec vec = {
-		.lv_niovecs = 1,
-		.lv_iovecp = &reg,
-	};
-
-	ASSERT_ALWAYS(iclog);
-	error = xlog_write(log, &vec, ticket, commitlsnp, iclog,
-					XLOG_COMMIT_TRANS);
-	if (error)
-		xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
-	return error;
-}
-
-/*
- * Push on the buffer cache code if we ever use more than 75% of the on-disk
- * log space.  This code pushes on the lsn which would supposedly free up
- * the 25% which we want to leave free.  We may need to adopt a policy which
- * pushes on an lsn which is further along in the log once we reach the high
- * water mark.  In this manner, we would be creating a low water mark.
- */
-STATIC void
-xlog_grant_push_ail(
-	struct log	*log,
-	int		need_bytes)
-{
-	xfs_lsn_t	threshold_lsn = 0;
-	xfs_lsn_t	last_sync_lsn;
-	int		free_blocks;
-	int		free_bytes;
-	int		threshold_block;
-	int		threshold_cycle;
-	int		free_threshold;
-
-	ASSERT(BTOBB(need_bytes) < log->l_logBBsize);
-
-	free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
-	free_blocks = BTOBBT(free_bytes);
-
-	/*
-	 * Set the threshold for the minimum number of free blocks in the
-	 * log to the maximum of what the caller needs, one quarter of the
-	 * log, and 256 blocks.
-	 */
-	free_threshold = BTOBB(need_bytes);
-	free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2));
-	free_threshold = MAX(free_threshold, 256);
-	if (free_blocks >= free_threshold)
-		return;
-
-	xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle,
-						&threshold_block);
-	threshold_block += free_threshold;
-	if (threshold_block >= log->l_logBBsize) {
-		threshold_block -= log->l_logBBsize;
-		threshold_cycle += 1;
-	}
-	threshold_lsn = xlog_assign_lsn(threshold_cycle,
-					threshold_block);
-	/*
-	 * Don't pass in an lsn greater than the lsn of the last
-	 * log record known to be on disk. Use a snapshot of the last sync lsn
-	 * so that it doesn't change between the compare and the set.
-	 */
-	last_sync_lsn = atomic64_read(&log->l_last_sync_lsn);
-	if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0)
-		threshold_lsn = last_sync_lsn;
-
-	/*
-	 * Get the transaction layer to kick the dirty buffers out to
-	 * disk asynchronously. No point in trying to do this if
-	 * the filesystem is shutting down.
-	 */
-	if (!XLOG_FORCED_SHUTDOWN(log))
-		xfs_ail_push(log->l_ailp, threshold_lsn);
-}
-
-/*
- * The bdstrat callback function for log bufs. This gives us a central
- * place to trap bufs in case we get hit by a log I/O error and need to
- * shutdown. Actually, in practice, even when we didn't get a log error,
- * we transition the iclogs to IOERROR state *after* flushing all existing
- * iclogs to disk. This is because we don't want anymore new transactions to be
- * started or completed afterwards.
- */
-STATIC int
-xlog_bdstrat(
-	struct xfs_buf		*bp)
-{
-	struct xlog_in_core	*iclog = bp->b_fspriv;
-
-	if (iclog->ic_state & XLOG_STATE_IOERROR) {
-		xfs_buf_ioerror(bp, EIO);
-		xfs_buf_stale(bp);
-		xfs_buf_ioend(bp, 0);
-		/*
-		 * It would seem logical to return EIO here, but we rely on
-		 * the log state machine to propagate I/O errors instead of
-		 * doing it here.
-		 */
-		return 0;
-	}
-
-	xfs_buf_iorequest(bp);
-	return 0;
-}
-
-/*
- * Flush out the in-core log (iclog) to the on-disk log in an asynchronous 
- * fashion.  Previously, we should have moved the current iclog
- * ptr in the log to point to the next available iclog.  This allows further
- * write to continue while this code syncs out an iclog ready to go.
- * Before an in-core log can be written out, the data section must be scanned
- * to save away the 1st word of each BBSIZE block into the header.  We replace
- * it with the current cycle count.  Each BBSIZE block is tagged with the
- * cycle count because there in an implicit assumption that drives will
- * guarantee that entire 512 byte blocks get written at once.  In other words,
- * we can't have part of a 512 byte block written and part not written.  By
- * tagging each block, we will know which blocks are valid when recovering
- * after an unclean shutdown.
- *
- * This routine is single threaded on the iclog.  No other thread can be in
- * this routine with the same iclog.  Changing contents of iclog can there-
- * fore be done without grabbing the state machine lock.  Updating the global
- * log will require grabbing the lock though.
- *
- * The entire log manager uses a logical block numbering scheme.  Only
- * log_sync (and then only bwrite()) know about the fact that the log may
- * not start with block zero on a given device.  The log block start offset
- * is added immediately before calling bwrite().
- */
-
-STATIC int
-xlog_sync(xlog_t		*log,
-	  xlog_in_core_t	*iclog)
-{
-	xfs_caddr_t	dptr;		/* pointer to byte sized element */
-	xfs_buf_t	*bp;
-	int		i;
-	uint		count;		/* byte count of bwrite */
-	uint		count_init;	/* initial count before roundup */
-	int		roundoff;       /* roundoff to BB or stripe */
-	int		split = 0;	/* split write into two regions */
-	int		error;
-	int		v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb);
-
-	XFS_STATS_INC(xs_log_writes);
-	ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
-
-	/* Add for LR header */
-	count_init = log->l_iclog_hsize + iclog->ic_offset;
-
-	/* Round out the log write size */
-	if (v2 && log->l_mp->m_sb.sb_logsunit > 1) {
-		/* we have a v2 stripe unit to use */
-		count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init));
-	} else {
-		count = BBTOB(BTOBB(count_init));
-	}
-	roundoff = count - count_init;
-	ASSERT(roundoff >= 0);
-	ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && 
-                roundoff < log->l_mp->m_sb.sb_logsunit)
-		|| 
-		(log->l_mp->m_sb.sb_logsunit <= 1 && 
-		 roundoff < BBTOB(1)));
-
-	/* move grant heads by roundoff in sync */
-	xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff);
-	xlog_grant_add_space(log, &log->l_write_head.grant, roundoff);
-
-	/* put cycle number in every block */
-	xlog_pack_data(log, iclog, roundoff); 
-
-	/* real byte length */
-	if (v2) {
-		iclog->ic_header.h_len =
-			cpu_to_be32(iclog->ic_offset + roundoff);
-	} else {
-		iclog->ic_header.h_len =
-			cpu_to_be32(iclog->ic_offset);
-	}
-
-	bp = iclog->ic_bp;
-	XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn)));
-
-	XFS_STATS_ADD(xs_log_blocks, BTOBB(count));
-
-	/* Do we need to split this write into 2 parts? */
-	if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) {
-		split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)));
-		count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp));
-		iclog->ic_bwritecnt = 2;	/* split into 2 writes */
-	} else {
-		iclog->ic_bwritecnt = 1;
-	}
-	XFS_BUF_SET_COUNT(bp, count);
-	bp->b_fspriv = iclog;
-	XFS_BUF_ZEROFLAGS(bp);
-	XFS_BUF_ASYNC(bp);
-	bp->b_flags |= XBF_SYNCIO;
-
-	if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) {
-		bp->b_flags |= XBF_FUA;
-
-		/*
-		 * Flush the data device before flushing the log to make
-		 * sure all meta data written back from the AIL actually made
-		 * it to disk before stamping the new log tail LSN into the
-		 * log buffer.  For an external log we need to issue the
-		 * flush explicitly, and unfortunately synchronously here;
-		 * for an internal log we can simply use the block layer
-		 * state machine for preflushes.
-		 */
-		if (log->l_mp->m_logdev_targp != log->l_mp->m_ddev_targp)
-			xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp);
-		else
-			bp->b_flags |= XBF_FLUSH;
-	}
-
-	ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
-	ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
-
-	xlog_verify_iclog(log, iclog, count, B_TRUE);
-
-	/* account for log which doesn't start at block #0 */
-	XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
-	/*
-	 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem
-	 * is shutting down.
-	 */
-	XFS_BUF_WRITE(bp);
-
-	error = xlog_bdstrat(bp);
-	if (error) {
-		xfs_buf_ioerror_alert(bp, "xlog_sync");
-		return error;
-	}
-	if (split) {
-		bp = iclog->ic_log->l_xbuf;
-		XFS_BUF_SET_ADDR(bp, 0);	     /* logical 0 */
-		xfs_buf_associate_memory(bp,
-				(char *)&iclog->ic_header + count, split);
-		bp->b_fspriv = iclog;
-		XFS_BUF_ZEROFLAGS(bp);
-		XFS_BUF_ASYNC(bp);
-		bp->b_flags |= XBF_SYNCIO;
-		if (log->l_mp->m_flags & XFS_MOUNT_BARRIER)
-			bp->b_flags |= XBF_FUA;
-		dptr = bp->b_addr;
-		/*
-		 * Bump the cycle numbers at the start of each block
-		 * since this part of the buffer is at the start of
-		 * a new cycle.  Watch out for the header magic number
-		 * case, though.
-		 */
-		for (i = 0; i < split; i += BBSIZE) {
-			be32_add_cpu((__be32 *)dptr, 1);
-			if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM)
-				be32_add_cpu((__be32 *)dptr, 1);
-			dptr += BBSIZE;
-		}
-
-		ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
-		ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
-
-		/* account for internal log which doesn't start at block #0 */
-		XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
-		XFS_BUF_WRITE(bp);
-		error = xlog_bdstrat(bp);
-		if (error) {
-			xfs_buf_ioerror_alert(bp, "xlog_sync (split)");
-			return error;
-		}
-	}
-	return 0;
-}	/* xlog_sync */
-
-
-/*
- * Deallocate a log structure
- */
-STATIC void
-xlog_dealloc_log(xlog_t *log)
-{
-	xlog_in_core_t	*iclog, *next_iclog;
-	int		i;
-
-	xlog_cil_destroy(log);
-
-	/*
-	 * always need to ensure that the extra buffer does not point to memory
-	 * owned by another log buffer before we free it.
-	 */
-	xfs_buf_set_empty(log->l_xbuf, log->l_iclog_size);
-	xfs_buf_free(log->l_xbuf);
-
-	iclog = log->l_iclog;
-	for (i=0; i<log->l_iclog_bufs; i++) {
-		xfs_buf_free(iclog->ic_bp);
-		next_iclog = iclog->ic_next;
-		kmem_free(iclog);
-		iclog = next_iclog;
-	}
-	spinlock_destroy(&log->l_icloglock);
-
-	log->l_mp->m_log = NULL;
-	kmem_free(log);
-}	/* xlog_dealloc_log */
-
-/*
- * Update counters atomically now that memcpy is done.
- */
-/* ARGSUSED */
-static inline void
-xlog_state_finish_copy(xlog_t		*log,
-		       xlog_in_core_t	*iclog,
-		       int		record_cnt,
-		       int		copy_bytes)
-{
-	spin_lock(&log->l_icloglock);
-
-	be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt);
-	iclog->ic_offset += copy_bytes;
-
-	spin_unlock(&log->l_icloglock);
-}	/* xlog_state_finish_copy */
-
-
-
-
-/*
- * print out info relating to regions written which consume
- * the reservation
- */
-void
-xlog_print_tic_res(
-	struct xfs_mount	*mp,
-	struct xlog_ticket	*ticket)
-{
-	uint i;
-	uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t);
-
-	/* match with XLOG_REG_TYPE_* in xfs_log.h */
-	static char *res_type_str[XLOG_REG_TYPE_MAX] = {
-	    "bformat",
-	    "bchunk",
-	    "efi_format",
-	    "efd_format",
-	    "iformat",
-	    "icore",
-	    "iext",
-	    "ibroot",
-	    "ilocal",
-	    "iattr_ext",
-	    "iattr_broot",
-	    "iattr_local",
-	    "qformat",
-	    "dquot",
-	    "quotaoff",
-	    "LR header",
-	    "unmount",
-	    "commit",
-	    "trans header"
-	};
-	static char *trans_type_str[XFS_TRANS_TYPE_MAX] = {
-	    "SETATTR_NOT_SIZE",
-	    "SETATTR_SIZE",
-	    "INACTIVE",
-	    "CREATE",
-	    "CREATE_TRUNC",
-	    "TRUNCATE_FILE",
-	    "REMOVE",
-	    "LINK",
-	    "RENAME",
-	    "MKDIR",
-	    "RMDIR",
-	    "SYMLINK",
-	    "SET_DMATTRS",
-	    "GROWFS",
-	    "STRAT_WRITE",
-	    "DIOSTRAT",
-	    "WRITE_SYNC",
-	    "WRITEID",
-	    "ADDAFORK",
-	    "ATTRINVAL",
-	    "ATRUNCATE",
-	    "ATTR_SET",
-	    "ATTR_RM",
-	    "ATTR_FLAG",
-	    "CLEAR_AGI_BUCKET",
-	    "QM_SBCHANGE",
-	    "DUMMY1",
-	    "DUMMY2",
-	    "QM_QUOTAOFF",
-	    "QM_DQALLOC",
-	    "QM_SETQLIM",
-	    "QM_DQCLUSTER",
-	    "QM_QINOCREATE",
-	    "QM_QUOTAOFF_END",
-	    "SB_UNIT",
-	    "FSYNC_TS",
-	    "GROWFSRT_ALLOC",
-	    "GROWFSRT_ZERO",
-	    "GROWFSRT_FREE",
-	    "SWAPEXT"
-	};
-
-	xfs_warn(mp,
-		"xlog_write: reservation summary:\n"
-		"  trans type  = %s (%u)\n"
-		"  unit res    = %d bytes\n"
-		"  current res = %d bytes\n"
-		"  total reg   = %u bytes (o/flow = %u bytes)\n"
-		"  ophdrs      = %u (ophdr space = %u bytes)\n"
-		"  ophdr + reg = %u bytes\n"
-		"  num regions = %u\n",
-		((ticket->t_trans_type <= 0 ||
-		  ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ?
-		  "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]),
-		ticket->t_trans_type,
-		ticket->t_unit_res,
-		ticket->t_curr_res,
-		ticket->t_res_arr_sum, ticket->t_res_o_flow,
-		ticket->t_res_num_ophdrs, ophdr_spc,
-		ticket->t_res_arr_sum +
-		ticket->t_res_o_flow + ophdr_spc,
-		ticket->t_res_num);
-
-	for (i = 0; i < ticket->t_res_num; i++) {
-		uint r_type = ticket->t_res_arr[i].r_type;
-		xfs_warn(mp, "region[%u]: %s - %u bytes\n", i,
-			    ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ?
-			    "bad-rtype" : res_type_str[r_type-1]),
-			    ticket->t_res_arr[i].r_len);
-	}
-
-	xfs_alert_tag(mp, XFS_PTAG_LOGRES,
-		"xlog_write: reservation ran out. Need to up reservation");
-	xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
-}
-
-/*
- * Calculate the potential space needed by the log vector.  Each region gets
- * its own xlog_op_header_t and may need to be double word aligned.
- */
-static int
-xlog_write_calc_vec_length(
-	struct xlog_ticket	*ticket,
-	struct xfs_log_vec	*log_vector)
-{
-	struct xfs_log_vec	*lv;
-	int			headers = 0;
-	int			len = 0;
-	int			i;
-
-	/* acct for start rec of xact */
-	if (ticket->t_flags & XLOG_TIC_INITED)
-		headers++;
-
-	for (lv = log_vector; lv; lv = lv->lv_next) {
-		headers += lv->lv_niovecs;
-
-		for (i = 0; i < lv->lv_niovecs; i++) {
-			struct xfs_log_iovec	*vecp = &lv->lv_iovecp[i];
-
-			len += vecp->i_len;
-			xlog_tic_add_region(ticket, vecp->i_len, vecp->i_type);
-		}
-	}
-
-	ticket->t_res_num_ophdrs += headers;
-	len += headers * sizeof(struct xlog_op_header);
-
-	return len;
-}
-
-/*
- * If first write for transaction, insert start record  We can't be trying to
- * commit if we are inited.  We can't have any "partial_copy" if we are inited.
- */
-static int
-xlog_write_start_rec(
-	struct xlog_op_header	*ophdr,
-	struct xlog_ticket	*ticket)
-{
-	if (!(ticket->t_flags & XLOG_TIC_INITED))
-		return 0;
-
-	ophdr->oh_tid	= cpu_to_be32(ticket->t_tid);
-	ophdr->oh_clientid = ticket->t_clientid;
-	ophdr->oh_len = 0;
-	ophdr->oh_flags = XLOG_START_TRANS;
-	ophdr->oh_res2 = 0;
-
-	ticket->t_flags &= ~XLOG_TIC_INITED;
-
-	return sizeof(struct xlog_op_header);
-}
-
-static xlog_op_header_t *
-xlog_write_setup_ophdr(
-	struct log		*log,
-	struct xlog_op_header	*ophdr,
-	struct xlog_ticket	*ticket,
-	uint			flags)
-{
-	ophdr->oh_tid = cpu_to_be32(ticket->t_tid);
-	ophdr->oh_clientid = ticket->t_clientid;
-	ophdr->oh_res2 = 0;
-
-	/* are we copying a commit or unmount record? */
-	ophdr->oh_flags = flags;
-
-	/*
-	 * We've seen logs corrupted with bad transaction client ids.  This
-	 * makes sure that XFS doesn't generate them on.  Turn this into an EIO
-	 * and shut down the filesystem.
-	 */
-	switch (ophdr->oh_clientid)  {
-	case XFS_TRANSACTION:
-	case XFS_VOLUME:
-	case XFS_LOG:
-		break;
-	default:
-		xfs_warn(log->l_mp,
-			"Bad XFS transaction clientid 0x%x in ticket 0x%p",
-			ophdr->oh_clientid, ticket);
-		return NULL;
-	}
-
-	return ophdr;
-}
-
-/*
- * Set up the parameters of the region copy into the log. This has
- * to handle region write split across multiple log buffers - this
- * state is kept external to this function so that this code can
- * can be written in an obvious, self documenting manner.
- */
-static int
-xlog_write_setup_copy(
-	struct xlog_ticket	*ticket,
-	struct xlog_op_header	*ophdr,
-	int			space_available,
-	int			space_required,
-	int			*copy_off,
-	int			*copy_len,
-	int			*last_was_partial_copy,
-	int			*bytes_consumed)
-{
-	int			still_to_copy;
-
-	still_to_copy = space_required - *bytes_consumed;
-	*copy_off = *bytes_consumed;
-
-	if (still_to_copy <= space_available) {
-		/* write of region completes here */
-		*copy_len = still_to_copy;
-		ophdr->oh_len = cpu_to_be32(*copy_len);
-		if (*last_was_partial_copy)
-			ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS);
-		*last_was_partial_copy = 0;
-		*bytes_consumed = 0;
-		return 0;
-	}
-
-	/* partial write of region, needs extra log op header reservation */
-	*copy_len = space_available;
-	ophdr->oh_len = cpu_to_be32(*copy_len);
-	ophdr->oh_flags |= XLOG_CONTINUE_TRANS;
-	if (*last_was_partial_copy)
-		ophdr->oh_flags |= XLOG_WAS_CONT_TRANS;
-	*bytes_consumed += *copy_len;
-	(*last_was_partial_copy)++;
-
-	/* account for new log op header */
-	ticket->t_curr_res -= sizeof(struct xlog_op_header);
-	ticket->t_res_num_ophdrs++;
-
-	return sizeof(struct xlog_op_header);
-}
-
-static int
-xlog_write_copy_finish(
-	struct log		*log,
-	struct xlog_in_core	*iclog,
-	uint			flags,
-	int			*record_cnt,
-	int			*data_cnt,
-	int			*partial_copy,
-	int			*partial_copy_len,
-	int			log_offset,
-	struct xlog_in_core	**commit_iclog)
-{
-	if (*partial_copy) {
-		/*
-		 * This iclog has already been marked WANT_SYNC by
-		 * xlog_state_get_iclog_space.
-		 */
-		xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt);
-		*record_cnt = 0;
-		*data_cnt = 0;
-		return xlog_state_release_iclog(log, iclog);
-	}
-
-	*partial_copy = 0;
-	*partial_copy_len = 0;
-
-	if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) {
-		/* no more space in this iclog - push it. */
-		xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt);
-		*record_cnt = 0;
-		*data_cnt = 0;
-
-		spin_lock(&log->l_icloglock);
-		xlog_state_want_sync(log, iclog);
-		spin_unlock(&log->l_icloglock);
-
-		if (!commit_iclog)
-			return xlog_state_release_iclog(log, iclog);
-		ASSERT(flags & XLOG_COMMIT_TRANS);
-		*commit_iclog = iclog;
-	}
-
-	return 0;
-}
-
-/*
- * Write some region out to in-core log
- *
- * This will be called when writing externally provided regions or when
- * writing out a commit record for a given transaction.
- *
- * General algorithm:
- *	1. Find total length of this write.  This may include adding to the
- *		lengths passed in.
- *	2. Check whether we violate the tickets reservation.
- *	3. While writing to this iclog
- *	    A. Reserve as much space in this iclog as can get
- *	    B. If this is first write, save away start lsn
- *	    C. While writing this region:
- *		1. If first write of transaction, write start record
- *		2. Write log operation header (header per region)
- *		3. Find out if we can fit entire region into this iclog
- *		4. Potentially, verify destination memcpy ptr
- *		5. Memcpy (partial) region
- *		6. If partial copy, release iclog; otherwise, continue
- *			copying more regions into current iclog
- *	4. Mark want sync bit (in simulation mode)
- *	5. Release iclog for potential flush to on-disk log.
- *
- * ERRORS:
- * 1.	Panic if reservation is overrun.  This should never happen since
- *	reservation amounts are generated internal to the filesystem.
- * NOTES:
- * 1. Tickets are single threaded data structures.
- * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the
- *	syncing routine.  When a single log_write region needs to span
- *	multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set
- *	on all log operation writes which don't contain the end of the
- *	region.  The XLOG_END_TRANS bit is used for the in-core log
- *	operation which contains the end of the continued log_write region.
- * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog,
- *	we don't really know exactly how much space will be used.  As a result,
- *	we don't update ic_offset until the end when we know exactly how many
- *	bytes have been written out.
- */
-int
-xlog_write(
-	struct log		*log,
-	struct xfs_log_vec	*log_vector,
-	struct xlog_ticket	*ticket,
-	xfs_lsn_t		*start_lsn,
-	struct xlog_in_core	**commit_iclog,
-	uint			flags)
-{
-	struct xlog_in_core	*iclog = NULL;
-	struct xfs_log_iovec	*vecp;
-	struct xfs_log_vec	*lv;
-	int			len;
-	int			index;
-	int			partial_copy = 0;
-	int			partial_copy_len = 0;
-	int			contwr = 0;
-	int			record_cnt = 0;
-	int			data_cnt = 0;
-	int			error;
-
-	*start_lsn = 0;
-
-	len = xlog_write_calc_vec_length(ticket, log_vector);
-
-	/*
-	 * Region headers and bytes are already accounted for.
-	 * We only need to take into account start records and
-	 * split regions in this function.
-	 */
-	if (ticket->t_flags & XLOG_TIC_INITED)
-		ticket->t_curr_res -= sizeof(xlog_op_header_t);
-
-	/*
-	 * Commit record headers need to be accounted for. These
-	 * come in as separate writes so are easy to detect.
-	 */
-	if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS))
-		ticket->t_curr_res -= sizeof(xlog_op_header_t);
-
-	if (ticket->t_curr_res < 0)
-		xlog_print_tic_res(log->l_mp, ticket);
-
-	index = 0;
-	lv = log_vector;
-	vecp = lv->lv_iovecp;
-	while (lv && index < lv->lv_niovecs) {
-		void		*ptr;
-		int		log_offset;
-
-		error = xlog_state_get_iclog_space(log, len, &iclog, ticket,
-						   &contwr, &log_offset);
-		if (error)
-			return error;
-
-		ASSERT(log_offset <= iclog->ic_size - 1);
-		ptr = iclog->ic_datap + log_offset;
-
-		/* start_lsn is the first lsn written to. That's all we need. */
-		if (!*start_lsn)
-			*start_lsn = be64_to_cpu(iclog->ic_header.h_lsn);
-
-		/*
-		 * This loop writes out as many regions as can fit in the amount
-		 * of space which was allocated by xlog_state_get_iclog_space().
-		 */
-		while (lv && index < lv->lv_niovecs) {
-			struct xfs_log_iovec	*reg = &vecp[index];
-			struct xlog_op_header	*ophdr;
-			int			start_rec_copy;
-			int			copy_len;
-			int			copy_off;
-
-			ASSERT(reg->i_len % sizeof(__int32_t) == 0);
-			ASSERT((unsigned long)ptr % sizeof(__int32_t) == 0);
-
-			start_rec_copy = xlog_write_start_rec(ptr, ticket);
-			if (start_rec_copy) {
-				record_cnt++;
-				xlog_write_adv_cnt(&ptr, &len, &log_offset,
-						   start_rec_copy);
-			}
-
-			ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags);
-			if (!ophdr)
-				return XFS_ERROR(EIO);
-
-			xlog_write_adv_cnt(&ptr, &len, &log_offset,
-					   sizeof(struct xlog_op_header));
-
-			len += xlog_write_setup_copy(ticket, ophdr,
-						     iclog->ic_size-log_offset,
-						     reg->i_len,
-						     &copy_off, &copy_len,
-						     &partial_copy,
-						     &partial_copy_len);
-			xlog_verify_dest_ptr(log, ptr);
-
-			/* copy region */
-			ASSERT(copy_len >= 0);
-			memcpy(ptr, reg->i_addr + copy_off, copy_len);
-			xlog_write_adv_cnt(&ptr, &len, &log_offset, copy_len);
-
-			copy_len += start_rec_copy + sizeof(xlog_op_header_t);
-			record_cnt++;
-			data_cnt += contwr ? copy_len : 0;
-
-			error = xlog_write_copy_finish(log, iclog, flags,
-						       &record_cnt, &data_cnt,
-						       &partial_copy,
-						       &partial_copy_len,
-						       log_offset,
-						       commit_iclog);
-			if (error)
-				return error;
-
-			/*
-			 * if we had a partial copy, we need to get more iclog
-			 * space but we don't want to increment the region
-			 * index because there is still more is this region to
-			 * write.
-			 *
-			 * If we completed writing this region, and we flushed
-			 * the iclog (indicated by resetting of the record
-			 * count), then we also need to get more log space. If
-			 * this was the last record, though, we are done and
-			 * can just return.
-			 */
-			if (partial_copy)
-				break;
-
-			if (++index == lv->lv_niovecs) {
-				lv = lv->lv_next;
-				index = 0;
-				if (lv)
-					vecp = lv->lv_iovecp;
-			}
-			if (record_cnt == 0) {
-				if (!lv)
-					return 0;
-				break;
-			}
-		}
-	}
-
-	ASSERT(len == 0);
-
-	xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
-	if (!commit_iclog)
-		return xlog_state_release_iclog(log, iclog);
-
-	ASSERT(flags & XLOG_COMMIT_TRANS);
-	*commit_iclog = iclog;
-	return 0;
-}
-
-
-/*****************************************************************************
- *
- *		State Machine functions
- *
- *****************************************************************************
- */
-
-/* Clean iclogs starting from the head.  This ordering must be
- * maintained, so an iclog doesn't become ACTIVE beyond one that
- * is SYNCING.  This is also required to maintain the notion that we use
- * a ordered wait queue to hold off would be writers to the log when every
- * iclog is trying to sync to disk.
- *
- * State Change: DIRTY -> ACTIVE
- */
-STATIC void
-xlog_state_clean_log(xlog_t *log)
-{
-	xlog_in_core_t	*iclog;
-	int changed = 0;
-
-	iclog = log->l_iclog;
-	do {
-		if (iclog->ic_state == XLOG_STATE_DIRTY) {
-			iclog->ic_state	= XLOG_STATE_ACTIVE;
-			iclog->ic_offset       = 0;
-			ASSERT(iclog->ic_callback == NULL);
-			/*
-			 * If the number of ops in this iclog indicate it just
-			 * contains the dummy transaction, we can
-			 * change state into IDLE (the second time around).
-			 * Otherwise we should change the state into
-			 * NEED a dummy.
-			 * We don't need to cover the dummy.
-			 */
-			if (!changed &&
-			   (be32_to_cpu(iclog->ic_header.h_num_logops) ==
-			   		XLOG_COVER_OPS)) {
-				changed = 1;
-			} else {
-				/*
-				 * We have two dirty iclogs so start over
-				 * This could also be num of ops indicates
-				 * this is not the dummy going out.
-				 */
-				changed = 2;
-			}
-			iclog->ic_header.h_num_logops = 0;
-			memset(iclog->ic_header.h_cycle_data, 0,
-			      sizeof(iclog->ic_header.h_cycle_data));
-			iclog->ic_header.h_lsn = 0;
-		} else if (iclog->ic_state == XLOG_STATE_ACTIVE)
-			/* do nothing */;
-		else
-			break;	/* stop cleaning */
-		iclog = iclog->ic_next;
-	} while (iclog != log->l_iclog);
-
-	/* log is locked when we are called */
-	/*
-	 * Change state for the dummy log recording.
-	 * We usually go to NEED. But we go to NEED2 if the changed indicates
-	 * we are done writing the dummy record.
-	 * If we are done with the second dummy recored (DONE2), then
-	 * we go to IDLE.
-	 */
-	if (changed) {
-		switch (log->l_covered_state) {
-		case XLOG_STATE_COVER_IDLE:
-		case XLOG_STATE_COVER_NEED:
-		case XLOG_STATE_COVER_NEED2:
-			log->l_covered_state = XLOG_STATE_COVER_NEED;
-			break;
-
-		case XLOG_STATE_COVER_DONE:
-			if (changed == 1)
-				log->l_covered_state = XLOG_STATE_COVER_NEED2;
-			else
-				log->l_covered_state = XLOG_STATE_COVER_NEED;
-			break;
-
-		case XLOG_STATE_COVER_DONE2:
-			if (changed == 1)
-				log->l_covered_state = XLOG_STATE_COVER_IDLE;
-			else
-				log->l_covered_state = XLOG_STATE_COVER_NEED;
-			break;
-
-		default:
-			ASSERT(0);
-		}
-	}
-}	/* xlog_state_clean_log */
-
-STATIC xfs_lsn_t
-xlog_get_lowest_lsn(
-	xlog_t		*log)
-{
-	xlog_in_core_t  *lsn_log;
-	xfs_lsn_t	lowest_lsn, lsn;
-
-	lsn_log = log->l_iclog;
-	lowest_lsn = 0;
-	do {
-	    if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) {
-		lsn = be64_to_cpu(lsn_log->ic_header.h_lsn);
-		if ((lsn && !lowest_lsn) ||
-		    (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) {
-			lowest_lsn = lsn;
-		}
-	    }
-	    lsn_log = lsn_log->ic_next;
-	} while (lsn_log != log->l_iclog);
-	return lowest_lsn;
-}
-
-
-STATIC void
-xlog_state_do_callback(
-	xlog_t		*log,
-	int		aborted,
-	xlog_in_core_t	*ciclog)
-{
-	xlog_in_core_t	   *iclog;
-	xlog_in_core_t	   *first_iclog;	/* used to know when we've
-						 * processed all iclogs once */
-	xfs_log_callback_t *cb, *cb_next;
-	int		   flushcnt = 0;
-	xfs_lsn_t	   lowest_lsn;
-	int		   ioerrors;	/* counter: iclogs with errors */
-	int		   loopdidcallbacks; /* flag: inner loop did callbacks*/
-	int		   funcdidcallbacks; /* flag: function did callbacks */
-	int		   repeats;	/* for issuing console warnings if
-					 * looping too many times */
-	int		   wake = 0;
-
-	spin_lock(&log->l_icloglock);
-	first_iclog = iclog = log->l_iclog;
-	ioerrors = 0;
-	funcdidcallbacks = 0;
-	repeats = 0;
-
-	do {
-		/*
-		 * Scan all iclogs starting with the one pointed to by the
-		 * log.  Reset this starting point each time the log is
-		 * unlocked (during callbacks).
-		 *
-		 * Keep looping through iclogs until one full pass is made
-		 * without running any callbacks.
-		 */
-		first_iclog = log->l_iclog;
-		iclog = log->l_iclog;
-		loopdidcallbacks = 0;
-		repeats++;
-
-		do {
-
-			/* skip all iclogs in the ACTIVE & DIRTY states */
-			if (iclog->ic_state &
-			    (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) {
-				iclog = iclog->ic_next;
-				continue;
-			}
-
-			/*
-			 * Between marking a filesystem SHUTDOWN and stopping
-			 * the log, we do flush all iclogs to disk (if there
-			 * wasn't a log I/O error). So, we do want things to
-			 * go smoothly in case of just a SHUTDOWN  w/o a
-			 * LOG_IO_ERROR.
-			 */
-			if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
-				/*
-				 * Can only perform callbacks in order.  Since
-				 * this iclog is not in the DONE_SYNC/
-				 * DO_CALLBACK state, we skip the rest and
-				 * just try to clean up.  If we set our iclog
-				 * to DO_CALLBACK, we will not process it when
-				 * we retry since a previous iclog is in the
-				 * CALLBACK and the state cannot change since
-				 * we are holding the l_icloglock.
-				 */
-				if (!(iclog->ic_state &
-					(XLOG_STATE_DONE_SYNC |
-						 XLOG_STATE_DO_CALLBACK))) {
-					if (ciclog && (ciclog->ic_state ==
-							XLOG_STATE_DONE_SYNC)) {
-						ciclog->ic_state = XLOG_STATE_DO_CALLBACK;
-					}
-					break;
-				}
-				/*
-				 * We now have an iclog that is in either the
-				 * DO_CALLBACK or DONE_SYNC states. The other
-				 * states (WANT_SYNC, SYNCING, or CALLBACK were
-				 * caught by the above if and are going to
-				 * clean (i.e. we aren't doing their callbacks)
-				 * see the above if.
-				 */
-
-				/*
-				 * We will do one more check here to see if we
-				 * have chased our tail around.
-				 */
-
-				lowest_lsn = xlog_get_lowest_lsn(log);
-				if (lowest_lsn &&
-				    XFS_LSN_CMP(lowest_lsn,
-						be64_to_cpu(iclog->ic_header.h_lsn)) < 0) {
-					iclog = iclog->ic_next;
-					continue; /* Leave this iclog for
-						   * another thread */
-				}
-
-				iclog->ic_state = XLOG_STATE_CALLBACK;
-
-
-				/*
-				 * update the last_sync_lsn before we drop the
-				 * icloglock to ensure we are the only one that
-				 * can update it.
-				 */
-				ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn),
-					be64_to_cpu(iclog->ic_header.h_lsn)) <= 0);
-				atomic64_set(&log->l_last_sync_lsn,
-					be64_to_cpu(iclog->ic_header.h_lsn));
-
-			} else
-				ioerrors++;
-
-			spin_unlock(&log->l_icloglock);
-
-			/*
-			 * Keep processing entries in the callback list until
-			 * we come around and it is empty.  We need to
-			 * atomically see that the list is empty and change the
-			 * state to DIRTY so that we don't miss any more
-			 * callbacks being added.
-			 */
-			spin_lock(&iclog->ic_callback_lock);
-			cb = iclog->ic_callback;
-			while (cb) {
-				iclog->ic_callback_tail = &(iclog->ic_callback);
-				iclog->ic_callback = NULL;
-				spin_unlock(&iclog->ic_callback_lock);
-
-				/* perform callbacks in the order given */
-				for (; cb; cb = cb_next) {
-					cb_next = cb->cb_next;
-					cb->cb_func(cb->cb_arg, aborted);
-				}
-				spin_lock(&iclog->ic_callback_lock);
-				cb = iclog->ic_callback;
-			}
-
-			loopdidcallbacks++;
-			funcdidcallbacks++;
-
-			spin_lock(&log->l_icloglock);
-			ASSERT(iclog->ic_callback == NULL);
-			spin_unlock(&iclog->ic_callback_lock);
-			if (!(iclog->ic_state & XLOG_STATE_IOERROR))
-				iclog->ic_state = XLOG_STATE_DIRTY;
-
-			/*
-			 * Transition from DIRTY to ACTIVE if applicable.
-			 * NOP if STATE_IOERROR.
-			 */
-			xlog_state_clean_log(log);
-
-			/* wake up threads waiting in xfs_log_force() */
-			wake_up_all(&iclog->ic_force_wait);
-
-			iclog = iclog->ic_next;
-		} while (first_iclog != iclog);
-
-		if (repeats > 5000) {
-			flushcnt += repeats;
-			repeats = 0;
-			xfs_warn(log->l_mp,
-				"%s: possible infinite loop (%d iterations)",
-				__func__, flushcnt);
-		}
-	} while (!ioerrors && loopdidcallbacks);
-
-	/*
-	 * make one last gasp attempt to see if iclogs are being left in
-	 * limbo..
-	 */
-#ifdef DEBUG
-	if (funcdidcallbacks) {
-		first_iclog = iclog = log->l_iclog;
-		do {
-			ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK);
-			/*
-			 * Terminate the loop if iclogs are found in states
-			 * which will cause other threads to clean up iclogs.
-			 *
-			 * SYNCING - i/o completion will go through logs
-			 * DONE_SYNC - interrupt thread should be waiting for
-			 *              l_icloglock
-			 * IOERROR - give up hope all ye who enter here
-			 */
-			if (iclog->ic_state == XLOG_STATE_WANT_SYNC ||
-			    iclog->ic_state == XLOG_STATE_SYNCING ||
-			    iclog->ic_state == XLOG_STATE_DONE_SYNC ||
-			    iclog->ic_state == XLOG_STATE_IOERROR )
-				break;
-			iclog = iclog->ic_next;
-		} while (first_iclog != iclog);
-	}
-#endif
-
-	if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR))
-		wake = 1;
-	spin_unlock(&log->l_icloglock);
-
-	if (wake)
-		wake_up_all(&log->l_flush_wait);
-}
-
-
-/*
- * Finish transitioning this iclog to the dirty state.
- *
- * Make sure that we completely execute this routine only when this is
- * the last call to the iclog.  There is a good chance that iclog flushes,
- * when we reach the end of the physical log, get turned into 2 separate
- * calls to bwrite.  Hence, one iclog flush could generate two calls to this
- * routine.  By using the reference count bwritecnt, we guarantee that only
- * the second completion goes through.
- *
- * Callbacks could take time, so they are done outside the scope of the
- * global state machine log lock.
- */
-STATIC void
-xlog_state_done_syncing(
-	xlog_in_core_t	*iclog,
-	int		aborted)
-{
-	xlog_t		   *log = iclog->ic_log;
-
-	spin_lock(&log->l_icloglock);
-
-	ASSERT(iclog->ic_state == XLOG_STATE_SYNCING ||
-	       iclog->ic_state == XLOG_STATE_IOERROR);
-	ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
-	ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2);
-
-
-	/*
-	 * If we got an error, either on the first buffer, or in the case of
-	 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR,
-	 * and none should ever be attempted to be written to disk
-	 * again.
-	 */
-	if (iclog->ic_state != XLOG_STATE_IOERROR) {
-		if (--iclog->ic_bwritecnt == 1) {
-			spin_unlock(&log->l_icloglock);
-			return;
-		}
-		iclog->ic_state = XLOG_STATE_DONE_SYNC;
-	}
-
-	/*
-	 * Someone could be sleeping prior to writing out the next
-	 * iclog buffer, we wake them all, one will get to do the
-	 * I/O, the others get to wait for the result.
-	 */
-	wake_up_all(&iclog->ic_write_wait);
-	spin_unlock(&log->l_icloglock);
-	xlog_state_do_callback(log, aborted, iclog);	/* also cleans log */
-}	/* xlog_state_done_syncing */
-
-
-/*
- * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must
- * sleep.  We wait on the flush queue on the head iclog as that should be
- * the first iclog to complete flushing. Hence if all iclogs are syncing,
- * we will wait here and all new writes will sleep until a sync completes.
- *
- * The in-core logs are used in a circular fashion. They are not used
- * out-of-order even when an iclog past the head is free.
- *
- * return:
- *	* log_offset where xlog_write() can start writing into the in-core
- *		log's data space.
- *	* in-core log pointer to which xlog_write() should write.
- *	* boolean indicating this is a continued write to an in-core log.
- *		If this is the last write, then the in-core log's offset field
- *		needs to be incremented, depending on the amount of data which
- *		is copied.
- */
-STATIC int
-xlog_state_get_iclog_space(xlog_t	  *log,
-			   int		  len,
-			   xlog_in_core_t **iclogp,
-			   xlog_ticket_t  *ticket,
-			   int		  *continued_write,
-			   int		  *logoffsetp)
-{
-	int		  log_offset;
-	xlog_rec_header_t *head;
-	xlog_in_core_t	  *iclog;
-	int		  error;
-
-restart:
-	spin_lock(&log->l_icloglock);
-	if (XLOG_FORCED_SHUTDOWN(log)) {
-		spin_unlock(&log->l_icloglock);
-		return XFS_ERROR(EIO);
-	}
-
-	iclog = log->l_iclog;
-	if (iclog->ic_state != XLOG_STATE_ACTIVE) {
-		XFS_STATS_INC(xs_log_noiclogs);
-
-		/* Wait for log writes to have flushed */
-		xlog_wait(&log->l_flush_wait, &log->l_icloglock);
-		goto restart;
-	}
-
-	head = &iclog->ic_header;
-
-	atomic_inc(&iclog->ic_refcnt);	/* prevents sync */
-	log_offset = iclog->ic_offset;
-
-	/* On the 1st write to an iclog, figure out lsn.  This works
-	 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are
-	 * committing to.  If the offset is set, that's how many blocks
-	 * must be written.
-	 */
-	if (log_offset == 0) {
-		ticket->t_curr_res -= log->l_iclog_hsize;
-		xlog_tic_add_region(ticket,
-				    log->l_iclog_hsize,
-				    XLOG_REG_TYPE_LRHEADER);
-		head->h_cycle = cpu_to_be32(log->l_curr_cycle);
-		head->h_lsn = cpu_to_be64(
-			xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block));
-		ASSERT(log->l_curr_block >= 0);
-	}
-
-	/* If there is enough room to write everything, then do it.  Otherwise,
-	 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC
-	 * bit is on, so this will get flushed out.  Don't update ic_offset
-	 * until you know exactly how many bytes get copied.  Therefore, wait
-	 * until later to update ic_offset.
-	 *
-	 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's
-	 * can fit into remaining data section.
-	 */
-	if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) {
-		xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
-
-		/*
-		 * If I'm the only one writing to this iclog, sync it to disk.
-		 * We need to do an atomic compare and decrement here to avoid
-		 * racing with concurrent atomic_dec_and_lock() calls in
-		 * xlog_state_release_iclog() when there is more than one
-		 * reference to the iclog.
-		 */
-		if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) {
-			/* we are the only one */
-			spin_unlock(&log->l_icloglock);
-			error = xlog_state_release_iclog(log, iclog);
-			if (error)
-				return error;
-		} else {
-			spin_unlock(&log->l_icloglock);
-		}
-		goto restart;
-	}
-
-	/* Do we have enough room to write the full amount in the remainder
-	 * of this iclog?  Or must we continue a write on the next iclog and
-	 * mark this iclog as completely taken?  In the case where we switch
-	 * iclogs (to mark it taken), this particular iclog will release/sync
-	 * to disk in xlog_write().
-	 */
-	if (len <= iclog->ic_size - iclog->ic_offset) {
-		*continued_write = 0;
-		iclog->ic_offset += len;
-	} else {
-		*continued_write = 1;
-		xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
-	}
-	*iclogp = iclog;
-
-	ASSERT(iclog->ic_offset <= iclog->ic_size);
-	spin_unlock(&log->l_icloglock);
-
-	*logoffsetp = log_offset;
-	return 0;
-}	/* xlog_state_get_iclog_space */
-
-/* The first cnt-1 times through here we don't need to
- * move the grant write head because the permanent
- * reservation has reserved cnt times the unit amount.
- * Release part of current permanent unit reservation and
- * reset current reservation to be one units worth.  Also
- * move grant reservation head forward.
- */
-STATIC void
-xlog_regrant_reserve_log_space(xlog_t	     *log,
-			       xlog_ticket_t *ticket)
-{
-	trace_xfs_log_regrant_reserve_enter(log, ticket);
-
-	if (ticket->t_cnt > 0)
-		ticket->t_cnt--;
-
-	xlog_grant_sub_space(log, &log->l_reserve_head.grant,
-					ticket->t_curr_res);
-	xlog_grant_sub_space(log, &log->l_write_head.grant,
-					ticket->t_curr_res);
-	ticket->t_curr_res = ticket->t_unit_res;
-	xlog_tic_reset_res(ticket);
-
-	trace_xfs_log_regrant_reserve_sub(log, ticket);
-
-	/* just return if we still have some of the pre-reserved space */
-	if (ticket->t_cnt > 0)
-		return;
-
-	xlog_grant_add_space(log, &log->l_reserve_head.grant,
-					ticket->t_unit_res);
-
-	trace_xfs_log_regrant_reserve_exit(log, ticket);
-
-	ticket->t_curr_res = ticket->t_unit_res;
-	xlog_tic_reset_res(ticket);
-}	/* xlog_regrant_reserve_log_space */
-
-
-/*
- * Give back the space left from a reservation.
- *
- * All the information we need to make a correct determination of space left
- * is present.  For non-permanent reservations, things are quite easy.  The
- * count should have been decremented to zero.  We only need to deal with the
- * space remaining in the current reservation part of the ticket.  If the
- * ticket contains a permanent reservation, there may be left over space which
- * needs to be released.  A count of N means that N-1 refills of the current
- * reservation can be done before we need to ask for more space.  The first
- * one goes to fill up the first current reservation.  Once we run out of
- * space, the count will stay at zero and the only space remaining will be
- * in the current reservation field.
- */
-STATIC void
-xlog_ungrant_log_space(xlog_t	     *log,
-		       xlog_ticket_t *ticket)
-{
-	int	bytes;
-
-	if (ticket->t_cnt > 0)
-		ticket->t_cnt--;
-
-	trace_xfs_log_ungrant_enter(log, ticket);
-	trace_xfs_log_ungrant_sub(log, ticket);
-
-	/*
-	 * If this is a permanent reservation ticket, we may be able to free
-	 * up more space based on the remaining count.
-	 */
-	bytes = ticket->t_curr_res;
-	if (ticket->t_cnt > 0) {
-		ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV);
-		bytes += ticket->t_unit_res*ticket->t_cnt;
-	}
-
-	xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes);
-	xlog_grant_sub_space(log, &log->l_write_head.grant, bytes);
-
-	trace_xfs_log_ungrant_exit(log, ticket);
-
-	xfs_log_space_wake(log->l_mp);
-}
-
-/*
- * Flush iclog to disk if this is the last reference to the given iclog and
- * the WANT_SYNC bit is set.
- *
- * When this function is entered, the iclog is not necessarily in the
- * WANT_SYNC state.  It may be sitting around waiting to get filled.
- *
- *
- */
-STATIC int
-xlog_state_release_iclog(
-	xlog_t		*log,
-	xlog_in_core_t	*iclog)
-{
-	int		sync = 0;	/* do we sync? */
-
-	if (iclog->ic_state & XLOG_STATE_IOERROR)
-		return XFS_ERROR(EIO);
-
-	ASSERT(atomic_read(&iclog->ic_refcnt) > 0);
-	if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock))
-		return 0;
-
-	if (iclog->ic_state & XLOG_STATE_IOERROR) {
-		spin_unlock(&log->l_icloglock);
-		return XFS_ERROR(EIO);
-	}
-	ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE ||
-	       iclog->ic_state == XLOG_STATE_WANT_SYNC);
-
-	if (iclog->ic_state == XLOG_STATE_WANT_SYNC) {
-		/* update tail before writing to iclog */
-		xfs_lsn_t tail_lsn = xlog_assign_tail_lsn(log->l_mp);
-		sync++;
-		iclog->ic_state = XLOG_STATE_SYNCING;
-		iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn);
-		xlog_verify_tail_lsn(log, iclog, tail_lsn);
-		/* cycle incremented when incrementing curr_block */
-	}
-	spin_unlock(&log->l_icloglock);
-
-	/*
-	 * We let the log lock go, so it's possible that we hit a log I/O
-	 * error or some other SHUTDOWN condition that marks the iclog
-	 * as XLOG_STATE_IOERROR before the bwrite. However, we know that
-	 * this iclog has consistent data, so we ignore IOERROR
-	 * flags after this point.
-	 */
-	if (sync)
-		return xlog_sync(log, iclog);
-	return 0;
-}	/* xlog_state_release_iclog */
-
-
-/*
- * This routine will mark the current iclog in the ring as WANT_SYNC
- * and move the current iclog pointer to the next iclog in the ring.
- * When this routine is called from xlog_state_get_iclog_space(), the
- * exact size of the iclog has not yet been determined.  All we know is
- * that every data block.  We have run out of space in this log record.
- */
-STATIC void
-xlog_state_switch_iclogs(xlog_t		*log,
-			 xlog_in_core_t *iclog,
-			 int		eventual_size)
-{
-	ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
-	if (!eventual_size)
-		eventual_size = iclog->ic_offset;
-	iclog->ic_state = XLOG_STATE_WANT_SYNC;
-	iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block);
-	log->l_prev_block = log->l_curr_block;
-	log->l_prev_cycle = log->l_curr_cycle;
-
-	/* roll log?: ic_offset changed later */
-	log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize);
-
-	/* Round up to next log-sunit */
-	if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) &&
-	    log->l_mp->m_sb.sb_logsunit > 1) {
-		__uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit);
-		log->l_curr_block = roundup(log->l_curr_block, sunit_bb);
-	}
-
-	if (log->l_curr_block >= log->l_logBBsize) {
-		log->l_curr_cycle++;
-		if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM)
-			log->l_curr_cycle++;
-		log->l_curr_block -= log->l_logBBsize;
-		ASSERT(log->l_curr_block >= 0);
-	}
-	ASSERT(iclog == log->l_iclog);
-	log->l_iclog = iclog->ic_next;
-}	/* xlog_state_switch_iclogs */
-
-/*
- * Write out all data in the in-core log as of this exact moment in time.
- *
- * Data may be written to the in-core log during this call.  However,
- * we don't guarantee this data will be written out.  A change from past
- * implementation means this routine will *not* write out zero length LRs.
- *
- * Basically, we try and perform an intelligent scan of the in-core logs.
- * If we determine there is no flushable data, we just return.  There is no
- * flushable data if:
- *
- *	1. the current iclog is active and has no data; the previous iclog
- *		is in the active or dirty state.
- *	2. the current iclog is drity, and the previous iclog is in the
- *		active or dirty state.
- *
- * We may sleep if:
- *
- *	1. the current iclog is not in the active nor dirty state.
- *	2. the current iclog dirty, and the previous iclog is not in the
- *		active nor dirty state.
- *	3. the current iclog is active, and there is another thread writing
- *		to this particular iclog.
- *	4. a) the current iclog is active and has no other writers
- *	   b) when we return from flushing out this iclog, it is still
- *		not in the active nor dirty state.
- */
-int
-_xfs_log_force(
-	struct xfs_mount	*mp,
-	uint			flags,
-	int			*log_flushed)
-{
-	struct log		*log = mp->m_log;
-	struct xlog_in_core	*iclog;
-	xfs_lsn_t		lsn;
-
-	XFS_STATS_INC(xs_log_force);
-
-	xlog_cil_force(log);
-
-	spin_lock(&log->l_icloglock);
-
-	iclog = log->l_iclog;
-	if (iclog->ic_state & XLOG_STATE_IOERROR) {
-		spin_unlock(&log->l_icloglock);
-		return XFS_ERROR(EIO);
-	}
-
-	/* If the head iclog is not active nor dirty, we just attach
-	 * ourselves to the head and go to sleep.
-	 */
-	if (iclog->ic_state == XLOG_STATE_ACTIVE ||
-	    iclog->ic_state == XLOG_STATE_DIRTY) {
-		/*
-		 * If the head is dirty or (active and empty), then
-		 * we need to look at the previous iclog.  If the previous
-		 * iclog is active or dirty we are done.  There is nothing
-		 * to sync out.  Otherwise, we attach ourselves to the
-		 * previous iclog and go to sleep.
-		 */
-		if (iclog->ic_state == XLOG_STATE_DIRTY ||
-		    (atomic_read(&iclog->ic_refcnt) == 0
-		     && iclog->ic_offset == 0)) {
-			iclog = iclog->ic_prev;
-			if (iclog->ic_state == XLOG_STATE_ACTIVE ||
-			    iclog->ic_state == XLOG_STATE_DIRTY)
-				goto no_sleep;
-			else
-				goto maybe_sleep;
-		} else {
-			if (atomic_read(&iclog->ic_refcnt) == 0) {
-				/* We are the only one with access to this
-				 * iclog.  Flush it out now.  There should
-				 * be a roundoff of zero to show that someone
-				 * has already taken care of the roundoff from
-				 * the previous sync.
-				 */
-				atomic_inc(&iclog->ic_refcnt);
-				lsn = be64_to_cpu(iclog->ic_header.h_lsn);
-				xlog_state_switch_iclogs(log, iclog, 0);
-				spin_unlock(&log->l_icloglock);
-
-				if (xlog_state_release_iclog(log, iclog))
-					return XFS_ERROR(EIO);
-
-				if (log_flushed)
-					*log_flushed = 1;
-				spin_lock(&log->l_icloglock);
-				if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn &&
-				    iclog->ic_state != XLOG_STATE_DIRTY)
-					goto maybe_sleep;
-				else
-					goto no_sleep;
-			} else {
-				/* Someone else is writing to this iclog.
-				 * Use its call to flush out the data.  However,
-				 * the other thread may not force out this LR,
-				 * so we mark it WANT_SYNC.
-				 */
-				xlog_state_switch_iclogs(log, iclog, 0);
-				goto maybe_sleep;
-			}
-		}
-	}
-
-	/* By the time we come around again, the iclog could've been filled
-	 * which would give it another lsn.  If we have a new lsn, just
-	 * return because the relevant data has been flushed.
-	 */
-maybe_sleep:
-	if (flags & XFS_LOG_SYNC) {
-		/*
-		 * We must check if we're shutting down here, before
-		 * we wait, while we're holding the l_icloglock.
-		 * Then we check again after waking up, in case our
-		 * sleep was disturbed by a bad news.
-		 */
-		if (iclog->ic_state & XLOG_STATE_IOERROR) {
-			spin_unlock(&log->l_icloglock);
-			return XFS_ERROR(EIO);
-		}
-		XFS_STATS_INC(xs_log_force_sleep);
-		xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
-		/*
-		 * No need to grab the log lock here since we're
-		 * only deciding whether or not to return EIO
-		 * and the memory read should be atomic.
-		 */
-		if (iclog->ic_state & XLOG_STATE_IOERROR)
-			return XFS_ERROR(EIO);
-		if (log_flushed)
-			*log_flushed = 1;
-	} else {
-
-no_sleep:
-		spin_unlock(&log->l_icloglock);
-	}
-	return 0;
-}
-
-/*
- * Wrapper for _xfs_log_force(), to be used when caller doesn't care
- * about errors or whether the log was flushed or not. This is the normal
- * interface to use when trying to unpin items or move the log forward.
- */
-void
-xfs_log_force(
-	xfs_mount_t	*mp,
-	uint		flags)
-{
-	int	error;
-
-	error = _xfs_log_force(mp, flags, NULL);
-	if (error)
-		xfs_warn(mp, "%s: error %d returned.", __func__, error);
-}
-
-/*
- * Force the in-core log to disk for a specific LSN.
- *
- * Find in-core log with lsn.
- *	If it is in the DIRTY state, just return.
- *	If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
- *		state and go to sleep or return.
- *	If it is in any other state, go to sleep or return.
- *
- * Synchronous forces are implemented with a signal variable. All callers
- * to force a given lsn to disk will wait on a the sv attached to the
- * specific in-core log.  When given in-core log finally completes its
- * write to disk, that thread will wake up all threads waiting on the
- * sv.
- */
-int
-_xfs_log_force_lsn(
-	struct xfs_mount	*mp,
-	xfs_lsn_t		lsn,
-	uint			flags,
-	int			*log_flushed)
-{
-	struct log		*log = mp->m_log;
-	struct xlog_in_core	*iclog;
-	int			already_slept = 0;
-
-	ASSERT(lsn != 0);
-
-	XFS_STATS_INC(xs_log_force);
-
-	lsn = xlog_cil_force_lsn(log, lsn);
-	if (lsn == NULLCOMMITLSN)
-		return 0;
-
-try_again:
-	spin_lock(&log->l_icloglock);
-	iclog = log->l_iclog;
-	if (iclog->ic_state & XLOG_STATE_IOERROR) {
-		spin_unlock(&log->l_icloglock);
-		return XFS_ERROR(EIO);
-	}
-
-	do {
-		if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) {
-			iclog = iclog->ic_next;
-			continue;
-		}
-
-		if (iclog->ic_state == XLOG_STATE_DIRTY) {
-			spin_unlock(&log->l_icloglock);
-			return 0;
-		}
-
-		if (iclog->ic_state == XLOG_STATE_ACTIVE) {
-			/*
-			 * We sleep here if we haven't already slept (e.g.
-			 * this is the first time we've looked at the correct
-			 * iclog buf) and the buffer before us is going to
-			 * be sync'ed. The reason for this is that if we
-			 * are doing sync transactions here, by waiting for
-			 * the previous I/O to complete, we can allow a few
-			 * more transactions into this iclog before we close
-			 * it down.
-			 *
-			 * Otherwise, we mark the buffer WANT_SYNC, and bump
-			 * up the refcnt so we can release the log (which
-			 * drops the ref count).  The state switch keeps new
-			 * transaction commits from using this buffer.  When
-			 * the current commits finish writing into the buffer,
-			 * the refcount will drop to zero and the buffer will
-			 * go out then.
-			 */
-			if (!already_slept &&
-			    (iclog->ic_prev->ic_state &
-			     (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) {
-				ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR));
-
-				XFS_STATS_INC(xs_log_force_sleep);
-
-				xlog_wait(&iclog->ic_prev->ic_write_wait,
-							&log->l_icloglock);
-				if (log_flushed)
-					*log_flushed = 1;
-				already_slept = 1;
-				goto try_again;
-			}
-			atomic_inc(&iclog->ic_refcnt);
-			xlog_state_switch_iclogs(log, iclog, 0);
-			spin_unlock(&log->l_icloglock);
-			if (xlog_state_release_iclog(log, iclog))
-				return XFS_ERROR(EIO);
-			if (log_flushed)
-				*log_flushed = 1;
-			spin_lock(&log->l_icloglock);
-		}
-
-		if ((flags & XFS_LOG_SYNC) && /* sleep */
-		    !(iclog->ic_state &
-		      (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) {
-			/*
-			 * Don't wait on completion if we know that we've
-			 * gotten a log write error.
-			 */
-			if (iclog->ic_state & XLOG_STATE_IOERROR) {
-				spin_unlock(&log->l_icloglock);
-				return XFS_ERROR(EIO);
-			}
-			XFS_STATS_INC(xs_log_force_sleep);
-			xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
-			/*
-			 * No need to grab the log lock here since we're
-			 * only deciding whether or not to return EIO
-			 * and the memory read should be atomic.
-			 */
-			if (iclog->ic_state & XLOG_STATE_IOERROR)
-				return XFS_ERROR(EIO);
-
-			if (log_flushed)
-				*log_flushed = 1;
-		} else {		/* just return */
-			spin_unlock(&log->l_icloglock);
-		}
-
-		return 0;
-	} while (iclog != log->l_iclog);
-
-	spin_unlock(&log->l_icloglock);
-	return 0;
-}
-
-/*
- * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care
- * about errors or whether the log was flushed or not. This is the normal
- * interface to use when trying to unpin items or move the log forward.
- */
-void
-xfs_log_force_lsn(
-	xfs_mount_t	*mp,
-	xfs_lsn_t	lsn,
-	uint		flags)
-{
-	int	error;
-
-	error = _xfs_log_force_lsn(mp, lsn, flags, NULL);
-	if (error)
-		xfs_warn(mp, "%s: error %d returned.", __func__, error);
-}
-
-/*
- * Called when we want to mark the current iclog as being ready to sync to
- * disk.
- */
-STATIC void
-xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog)
-{
-	assert_spin_locked(&log->l_icloglock);
-
-	if (iclog->ic_state == XLOG_STATE_ACTIVE) {
-		xlog_state_switch_iclogs(log, iclog, 0);
-	} else {
-		ASSERT(iclog->ic_state &
-			(XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR));
-	}
-}
-
-
-/*****************************************************************************
- *
- *		TICKET functions
- *
- *****************************************************************************
- */
-
-/*
- * Free a used ticket when its refcount falls to zero.
- */
-void
-xfs_log_ticket_put(
-	xlog_ticket_t	*ticket)
-{
-	ASSERT(atomic_read(&ticket->t_ref) > 0);
-	if (atomic_dec_and_test(&ticket->t_ref))
-		kmem_zone_free(xfs_log_ticket_zone, ticket);
-}
-
-xlog_ticket_t *
-xfs_log_ticket_get(
-	xlog_ticket_t	*ticket)
-{
-	ASSERT(atomic_read(&ticket->t_ref) > 0);
-	atomic_inc(&ticket->t_ref);
-	return ticket;
-}
-
-/*
- * Allocate and initialise a new log ticket.
- */
-xlog_ticket_t *
-xlog_ticket_alloc(
-	struct log	*log,
-	int		unit_bytes,
-	int		cnt,
-	char		client,
-	bool		permanent,
-	int		alloc_flags)
-{
-	struct xlog_ticket *tic;
-	uint		num_headers;
-	int		iclog_space;
-
-	tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags);
-	if (!tic)
-		return NULL;
-
-	/*
-	 * Permanent reservations have up to 'cnt'-1 active log operations
-	 * in the log.  A unit in this case is the amount of space for one
-	 * of these log operations.  Normal reservations have a cnt of 1
-	 * and their unit amount is the total amount of space required.
-	 *
-	 * The following lines of code account for non-transaction data
-	 * which occupy space in the on-disk log.
-	 *
-	 * Normal form of a transaction is:
-	 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph>
-	 * and then there are LR hdrs, split-recs and roundoff at end of syncs.
-	 *
-	 * We need to account for all the leadup data and trailer data
-	 * around the transaction data.
-	 * And then we need to account for the worst case in terms of using
-	 * more space.
-	 * The worst case will happen if:
-	 * - the placement of the transaction happens to be such that the
-	 *   roundoff is at its maximum
-	 * - the transaction data is synced before the commit record is synced
-	 *   i.e. <transaction-data><roundoff> | <commit-rec><roundoff>
-	 *   Therefore the commit record is in its own Log Record.
-	 *   This can happen as the commit record is called with its
-	 *   own region to xlog_write().
-	 *   This then means that in the worst case, roundoff can happen for
-	 *   the commit-rec as well.
-	 *   The commit-rec is smaller than padding in this scenario and so it is
-	 *   not added separately.
-	 */
-
-	/* for trans header */
-	unit_bytes += sizeof(xlog_op_header_t);
-	unit_bytes += sizeof(xfs_trans_header_t);
-
-	/* for start-rec */
-	unit_bytes += sizeof(xlog_op_header_t);
-
-	/*
-	 * for LR headers - the space for data in an iclog is the size minus
-	 * the space used for the headers. If we use the iclog size, then we
-	 * undercalculate the number of headers required.
-	 *
-	 * Furthermore - the addition of op headers for split-recs might
-	 * increase the space required enough to require more log and op
-	 * headers, so take that into account too.
-	 *
-	 * IMPORTANT: This reservation makes the assumption that if this
-	 * transaction is the first in an iclog and hence has the LR headers
-	 * accounted to it, then the remaining space in the iclog is
-	 * exclusively for this transaction.  i.e. if the transaction is larger
-	 * than the iclog, it will be the only thing in that iclog.
-	 * Fundamentally, this means we must pass the entire log vector to
-	 * xlog_write to guarantee this.
-	 */
-	iclog_space = log->l_iclog_size - log->l_iclog_hsize;
-	num_headers = howmany(unit_bytes, iclog_space);
-
-	/* for split-recs - ophdrs added when data split over LRs */
-	unit_bytes += sizeof(xlog_op_header_t) * num_headers;
-
-	/* add extra header reservations if we overrun */
-	while (!num_headers ||
-	       howmany(unit_bytes, iclog_space) > num_headers) {
-		unit_bytes += sizeof(xlog_op_header_t);
-		num_headers++;
-	}
-	unit_bytes += log->l_iclog_hsize * num_headers;
-
-	/* for commit-rec LR header - note: padding will subsume the ophdr */
-	unit_bytes += log->l_iclog_hsize;
-
-	/* for roundoff padding for transaction data and one for commit record */
-	if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) &&
-	    log->l_mp->m_sb.sb_logsunit > 1) {
-		/* log su roundoff */
-		unit_bytes += 2*log->l_mp->m_sb.sb_logsunit;
-	} else {
-		/* BB roundoff */
-		unit_bytes += 2*BBSIZE;
-        }
-
-	atomic_set(&tic->t_ref, 1);
-	tic->t_task		= current;
-	INIT_LIST_HEAD(&tic->t_queue);
-	tic->t_unit_res		= unit_bytes;
-	tic->t_curr_res		= unit_bytes;
-	tic->t_cnt		= cnt;
-	tic->t_ocnt		= cnt;
-	tic->t_tid		= random32();
-	tic->t_clientid		= client;
-	tic->t_flags		= XLOG_TIC_INITED;
-	tic->t_trans_type	= 0;
-	if (permanent)
-		tic->t_flags |= XLOG_TIC_PERM_RESERV;
-
-	xlog_tic_reset_res(tic);
-
-	return tic;
-}
-
-
-/******************************************************************************
- *
- *		Log debug routines
- *
- ******************************************************************************
- */
-#if defined(DEBUG)
-/*
- * Make sure that the destination ptr is within the valid data region of
- * one of the iclogs.  This uses backup pointers stored in a different
- * part of the log in case we trash the log structure.
- */
-void
-xlog_verify_dest_ptr(
-	struct log	*log,
-	char		*ptr)
-{
-	int i;
-	int good_ptr = 0;
-
-	for (i = 0; i < log->l_iclog_bufs; i++) {
-		if (ptr >= log->l_iclog_bak[i] &&
-		    ptr <= log->l_iclog_bak[i] + log->l_iclog_size)
-			good_ptr++;
-	}
-
-	if (!good_ptr)
-		xfs_emerg(log->l_mp, "%s: invalid ptr", __func__);
-}
-
-/*
- * Check to make sure the grant write head didn't just over lap the tail.  If
- * the cycles are the same, we can't be overlapping.  Otherwise, make sure that
- * the cycles differ by exactly one and check the byte count.
- *
- * This check is run unlocked, so can give false positives. Rather than assert
- * on failures, use a warn-once flag and a panic tag to allow the admin to
- * determine if they want to panic the machine when such an error occurs. For
- * debug kernels this will have the same effect as using an assert but, unlinke
- * an assert, it can be turned off at runtime.
- */
-STATIC void
-xlog_verify_grant_tail(
-	struct log	*log)
-{
-	int		tail_cycle, tail_blocks;
-	int		cycle, space;
-
-	xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space);
-	xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks);
-	if (tail_cycle != cycle) {
-		if (cycle - 1 != tail_cycle &&
-		    !(log->l_flags & XLOG_TAIL_WARN)) {
-			xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,
-				"%s: cycle - 1 != tail_cycle", __func__);
-			log->l_flags |= XLOG_TAIL_WARN;
-		}
-
-		if (space > BBTOB(tail_blocks) &&
-		    !(log->l_flags & XLOG_TAIL_WARN)) {
-			xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,
-				"%s: space > BBTOB(tail_blocks)", __func__);
-			log->l_flags |= XLOG_TAIL_WARN;
-		}
-	}
-}
-
-/* check if it will fit */
-STATIC void
-xlog_verify_tail_lsn(xlog_t	    *log,
-		     xlog_in_core_t *iclog,
-		     xfs_lsn_t	    tail_lsn)
-{
-    int blocks;
-
-    if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) {
-	blocks =
-	    log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn));
-	if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize))
-		xfs_emerg(log->l_mp, "%s: ran out of log space", __func__);
-    } else {
-	ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle);
-
-	if (BLOCK_LSN(tail_lsn) == log->l_prev_block)
-		xfs_emerg(log->l_mp, "%s: tail wrapped", __func__);
-
-	blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block;
-	if (blocks < BTOBB(iclog->ic_offset) + 1)
-		xfs_emerg(log->l_mp, "%s: ran out of log space", __func__);
-    }
-}	/* xlog_verify_tail_lsn */
-
-/*
- * Perform a number of checks on the iclog before writing to disk.
- *
- * 1. Make sure the iclogs are still circular
- * 2. Make sure we have a good magic number
- * 3. Make sure we don't have magic numbers in the data
- * 4. Check fields of each log operation header for:
- *	A. Valid client identifier
- *	B. tid ptr value falls in valid ptr space (user space code)
- *	C. Length in log record header is correct according to the
- *		individual operation headers within record.
- * 5. When a bwrite will occur within 5 blocks of the front of the physical
- *	log, check the preceding blocks of the physical log to make sure all
- *	the cycle numbers agree with the current cycle number.
- */
-STATIC void
-xlog_verify_iclog(xlog_t	 *log,
-		  xlog_in_core_t *iclog,
-		  int		 count,
-		  boolean_t	 syncing)
-{
-	xlog_op_header_t	*ophead;
-	xlog_in_core_t		*icptr;
-	xlog_in_core_2_t	*xhdr;
-	xfs_caddr_t		ptr;
-	xfs_caddr_t		base_ptr;
-	__psint_t		field_offset;
-	__uint8_t		clientid;
-	int			len, i, j, k, op_len;
-	int			idx;
-
-	/* check validity of iclog pointers */
-	spin_lock(&log->l_icloglock);
-	icptr = log->l_iclog;
-	for (i=0; i < log->l_iclog_bufs; i++) {
-		if (icptr == NULL)
-			xfs_emerg(log->l_mp, "%s: invalid ptr", __func__);
-		icptr = icptr->ic_next;
-	}
-	if (icptr != log->l_iclog)
-		xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__);
-	spin_unlock(&log->l_icloglock);
-
-	/* check log magic numbers */
-	if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM))
-		xfs_emerg(log->l_mp, "%s: invalid magic num", __func__);
-
-	ptr = (xfs_caddr_t) &iclog->ic_header;
-	for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count;
-	     ptr += BBSIZE) {
-		if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM))
-			xfs_emerg(log->l_mp, "%s: unexpected magic num",
-				__func__);
-	}
-
-	/* check fields */
-	len = be32_to_cpu(iclog->ic_header.h_num_logops);
-	ptr = iclog->ic_datap;
-	base_ptr = ptr;
-	ophead = (xlog_op_header_t *)ptr;
-	xhdr = iclog->ic_data;
-	for (i = 0; i < len; i++) {
-		ophead = (xlog_op_header_t *)ptr;
-
-		/* clientid is only 1 byte */
-		field_offset = (__psint_t)
-			       ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr);
-		if (syncing == B_FALSE || (field_offset & 0x1ff)) {
-			clientid = ophead->oh_clientid;
-		} else {
-			idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap);
-			if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
-				j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
-				k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
-				clientid = xlog_get_client_id(
-					xhdr[j].hic_xheader.xh_cycle_data[k]);
-			} else {
-				clientid = xlog_get_client_id(
-					iclog->ic_header.h_cycle_data[idx]);
-			}
-		}
-		if (clientid != XFS_TRANSACTION && clientid != XFS_LOG)
-			xfs_warn(log->l_mp,
-				"%s: invalid clientid %d op 0x%p offset 0x%lx",
-				__func__, clientid, ophead,
-				(unsigned long)field_offset);
-
-		/* check length */
-		field_offset = (__psint_t)
-			       ((xfs_caddr_t)&(ophead->oh_len) - base_ptr);
-		if (syncing == B_FALSE || (field_offset & 0x1ff)) {
-			op_len = be32_to_cpu(ophead->oh_len);
-		} else {
-			idx = BTOBBT((__psint_t)&ophead->oh_len -
-				    (__psint_t)iclog->ic_datap);
-			if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
-				j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
-				k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
-				op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]);
-			} else {
-				op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]);
-			}
-		}
-		ptr += sizeof(xlog_op_header_t) + op_len;
-	}
-}	/* xlog_verify_iclog */
-#endif
-
-/*
- * Mark all iclogs IOERROR. l_icloglock is held by the caller.
- */
-STATIC int
-xlog_state_ioerror(
-	xlog_t	*log)
-{
-	xlog_in_core_t	*iclog, *ic;
-
-	iclog = log->l_iclog;
-	if (! (iclog->ic_state & XLOG_STATE_IOERROR)) {
-		/*
-		 * Mark all the incore logs IOERROR.
-		 * From now on, no log flushes will result.
-		 */
-		ic = iclog;
-		do {
-			ic->ic_state = XLOG_STATE_IOERROR;
-			ic = ic->ic_next;
-		} while (ic != iclog);
-		return 0;
-	}
-	/*
-	 * Return non-zero, if state transition has already happened.
-	 */
-	return 1;
-}
-
-/*
- * This is called from xfs_force_shutdown, when we're forcibly
- * shutting down the filesystem, typically because of an IO error.
- * Our main objectives here are to make sure that:
- *	a. the filesystem gets marked 'SHUTDOWN' for all interested
- *	   parties to find out, 'atomically'.
- *	b. those who're sleeping on log reservations, pinned objects and
- *	    other resources get woken up, and be told the bad news.
- *	c. nothing new gets queued up after (a) and (b) are done.
- *	d. if !logerror, flush the iclogs to disk, then seal them off
- *	   for business.
- *
- * Note: for delayed logging the !logerror case needs to flush the regions
- * held in memory out to the iclogs before flushing them to disk. This needs
- * to be done before the log is marked as shutdown, otherwise the flush to the
- * iclogs will fail.
- */
-int
-xfs_log_force_umount(
-	struct xfs_mount	*mp,
-	int			logerror)
-{
-	xlog_t		*log;
-	int		retval;
-
-	log = mp->m_log;
-
-	/*
-	 * If this happens during log recovery, don't worry about
-	 * locking; the log isn't open for business yet.
-	 */
-	if (!log ||
-	    log->l_flags & XLOG_ACTIVE_RECOVERY) {
-		mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
-		if (mp->m_sb_bp)
-			XFS_BUF_DONE(mp->m_sb_bp);
-		return 0;
-	}
-
-	/*
-	 * Somebody could've already done the hard work for us.
-	 * No need to get locks for this.
-	 */
-	if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) {
-		ASSERT(XLOG_FORCED_SHUTDOWN(log));
-		return 1;
-	}
-	retval = 0;
-
-	/*
-	 * Flush the in memory commit item list before marking the log as
-	 * being shut down. We need to do it in this order to ensure all the
-	 * completed transactions are flushed to disk with the xfs_log_force()
-	 * call below.
-	 */
-	if (!logerror)
-		xlog_cil_force(log);
-
-	/*
-	 * mark the filesystem and the as in a shutdown state and wake
-	 * everybody up to tell them the bad news.
-	 */
-	spin_lock(&log->l_icloglock);
-	mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
-	if (mp->m_sb_bp)
-		XFS_BUF_DONE(mp->m_sb_bp);
-
-	/*
-	 * This flag is sort of redundant because of the mount flag, but
-	 * it's good to maintain the separation between the log and the rest
-	 * of XFS.
-	 */
-	log->l_flags |= XLOG_IO_ERROR;
-
-	/*
-	 * If we hit a log error, we want to mark all the iclogs IOERROR
-	 * while we're still holding the loglock.
-	 */
-	if (logerror)
-		retval = xlog_state_ioerror(log);
-	spin_unlock(&log->l_icloglock);
-
-	/*
-	 * We don't want anybody waiting for log reservations after this. That
-	 * means we have to wake up everybody queued up on reserveq as well as
-	 * writeq.  In addition, we make sure in xlog_{re}grant_log_space that
-	 * we don't enqueue anything once the SHUTDOWN flag is set, and this
-	 * action is protected by the grant locks.
-	 */
-	xlog_grant_head_wake_all(&log->l_reserve_head);
-	xlog_grant_head_wake_all(&log->l_write_head);
-
-	if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) {
-		ASSERT(!logerror);
-		/*
-		 * Force the incore logs to disk before shutting the
-		 * log down completely.
-		 */
-		_xfs_log_force(mp, XFS_LOG_SYNC, NULL);
-
-		spin_lock(&log->l_icloglock);
-		retval = xlog_state_ioerror(log);
-		spin_unlock(&log->l_icloglock);
-	}
-	/*
-	 * Wake up everybody waiting on xfs_log_force.
-	 * Callback all log item committed functions as if the
-	 * log writes were completed.
-	 */
-	xlog_state_do_callback(log, XFS_LI_ABORTED, NULL);
-
-#ifdef XFSERRORDEBUG
-	{
-		xlog_in_core_t	*iclog;
-
-		spin_lock(&log->l_icloglock);
-		iclog = log->l_iclog;
-		do {
-			ASSERT(iclog->ic_callback == 0);
-			iclog = iclog->ic_next;
-		} while (iclog != log->l_iclog);
-		spin_unlock(&log->l_icloglock);
-	}
-#endif
-	/* return non-zero if log IOERROR transition had already happened */
-	return retval;
-}
-
-STATIC int
-xlog_iclogs_empty(xlog_t *log)
-{
-	xlog_in_core_t	*iclog;
-
-	iclog = log->l_iclog;
-	do {
-		/* endianness does not matter here, zero is zero in
-		 * any language.
-		 */
-		if (iclog->ic_header.h_num_logops)
-			return 0;
-		iclog = iclog->ic_next;
-	} while (iclog != log->l_iclog);
-	return 1;
-}