init android origin source code

1 files changed, 1565 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/fs/xfs/xfs_trans.c b/ANDROID_3.4.5/fs/xfs/xfs_trans.c
new file mode 100644
index 00000000..103b00c9
--- /dev/null
+++ b/ANDROID_3.4.5/fs/xfs/xfs_trans.c
@@ -0,0 +1,1565 @@
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * Copyright (C) 2010 Red Hat, 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_da_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_alloc.h"
+#include "xfs_bmap.h"
+#include "xfs_quota.h"
+#include "xfs_trans_priv.h"
+#include "xfs_trans_space.h"
+#include "xfs_inode_item.h"
+#include "xfs_trace.h"
+
+kmem_zone_t	*xfs_trans_zone;
+kmem_zone_t	*xfs_log_item_desc_zone;
+
+
+/*
+ * Various log reservation values.
+ *
+ * These are based on the size of the file system block because that is what
+ * most transactions manipulate.  Each adds in an additional 128 bytes per
+ * item logged to try to account for the overhead of the transaction mechanism.
+ *
+ * Note:  Most of the reservations underestimate the number of allocation
+ * groups into which they could free extents in the xfs_bmap_finish() call.
+ * This is because the number in the worst case is quite high and quite
+ * unusual.  In order to fix this we need to change xfs_bmap_finish() to free
+ * extents in only a single AG at a time.  This will require changes to the
+ * EFI code as well, however, so that the EFI for the extents not freed is
+ * logged again in each transaction.  See SGI PV #261917.
+ *
+ * Reservation functions here avoid a huge stack in xfs_trans_init due to
+ * register overflow from temporaries in the calculations.
+ */
+
+
+/*
+ * In a write transaction we can allocate a maximum of 2
+ * extents.  This gives:
+ *    the inode getting the new extents: inode size
+ *    the inode's bmap btree: max depth * block size
+ *    the agfs of the ags from which the extents are allocated: 2 * sector
+ *    the superblock free block counter: sector size
+ *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
+ * And the bmap_finish transaction can free bmap blocks in a join:
+ *    the agfs of the ags containing the blocks: 2 * sector size
+ *    the agfls of the ags containing the blocks: 2 * sector size
+ *    the super block free block counter: sector size
+ *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_write_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		MAX((mp->m_sb.sb_inodesize +
+		     XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK)) +
+		     2 * mp->m_sb.sb_sectsize +
+		     mp->m_sb.sb_sectsize +
+		     XFS_ALLOCFREE_LOG_RES(mp, 2) +
+		     128 * (4 + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) +
+			    XFS_ALLOCFREE_LOG_COUNT(mp, 2))),
+		    (2 * mp->m_sb.sb_sectsize +
+		     2 * mp->m_sb.sb_sectsize +
+		     mp->m_sb.sb_sectsize +
+		     XFS_ALLOCFREE_LOG_RES(mp, 2) +
+		     128 * (5 + XFS_ALLOCFREE_LOG_COUNT(mp, 2))));
+}
+
+/*
+ * In truncating a file we free up to two extents at once.  We can modify:
+ *    the inode being truncated: inode size
+ *    the inode's bmap btree: (max depth + 1) * block size
+ * And the bmap_finish transaction can free the blocks and bmap blocks:
+ *    the agf for each of the ags: 4 * sector size
+ *    the agfl for each of the ags: 4 * sector size
+ *    the super block to reflect the freed blocks: sector size
+ *    worst case split in allocation btrees per extent assuming 4 extents:
+ *		4 exts * 2 trees * (2 * max depth - 1) * block size
+ *    the inode btree: max depth * blocksize
+ *    the allocation btrees: 2 trees * (max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_itruncate_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		MAX((mp->m_sb.sb_inodesize +
+		     XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1) +
+		     128 * (2 + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK))),
+		    (4 * mp->m_sb.sb_sectsize +
+		     4 * mp->m_sb.sb_sectsize +
+		     mp->m_sb.sb_sectsize +
+		     XFS_ALLOCFREE_LOG_RES(mp, 4) +
+		     128 * (9 + XFS_ALLOCFREE_LOG_COUNT(mp, 4)) +
+		     128 * 5 +
+		     XFS_ALLOCFREE_LOG_RES(mp, 1) +
+		     128 * (2 + XFS_IALLOC_BLOCKS(mp) + mp->m_in_maxlevels +
+			    XFS_ALLOCFREE_LOG_COUNT(mp, 1))));
+}
+
+/*
+ * In renaming a files we can modify:
+ *    the four inodes involved: 4 * inode size
+ *    the two directory btrees: 2 * (max depth + v2) * dir block size
+ *    the two directory bmap btrees: 2 * max depth * block size
+ * And the bmap_finish transaction can free dir and bmap blocks (two sets
+ *	of bmap blocks) giving:
+ *    the agf for the ags in which the blocks live: 3 * sector size
+ *    the agfl for the ags in which the blocks live: 3 * sector size
+ *    the superblock for the free block count: sector size
+ *    the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_rename_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		MAX((4 * mp->m_sb.sb_inodesize +
+		     2 * XFS_DIROP_LOG_RES(mp) +
+		     128 * (4 + 2 * XFS_DIROP_LOG_COUNT(mp))),
+		    (3 * mp->m_sb.sb_sectsize +
+		     3 * mp->m_sb.sb_sectsize +
+		     mp->m_sb.sb_sectsize +
+		     XFS_ALLOCFREE_LOG_RES(mp, 3) +
+		     128 * (7 + XFS_ALLOCFREE_LOG_COUNT(mp, 3))));
+}
+
+/*
+ * For creating a link to an inode:
+ *    the parent directory inode: inode size
+ *    the linked inode: inode size
+ *    the directory btree could split: (max depth + v2) * dir block size
+ *    the directory bmap btree could join or split: (max depth + v2) * blocksize
+ * And the bmap_finish transaction can free some bmap blocks giving:
+ *    the agf for the ag in which the blocks live: sector size
+ *    the agfl for the ag in which the blocks live: sector size
+ *    the superblock for the free block count: sector size
+ *    the allocation btrees: 2 trees * (2 * max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_link_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		MAX((mp->m_sb.sb_inodesize +
+		     mp->m_sb.sb_inodesize +
+		     XFS_DIROP_LOG_RES(mp) +
+		     128 * (2 + XFS_DIROP_LOG_COUNT(mp))),
+		    (mp->m_sb.sb_sectsize +
+		     mp->m_sb.sb_sectsize +
+		     mp->m_sb.sb_sectsize +
+		     XFS_ALLOCFREE_LOG_RES(mp, 1) +
+		     128 * (3 + XFS_ALLOCFREE_LOG_COUNT(mp, 1))));
+}
+
+/*
+ * For removing a directory entry we can modify:
+ *    the parent directory inode: inode size
+ *    the removed inode: inode size
+ *    the directory btree could join: (max depth + v2) * dir block size
+ *    the directory bmap btree could join or split: (max depth + v2) * blocksize
+ * And the bmap_finish transaction can free the dir and bmap blocks giving:
+ *    the agf for the ag in which the blocks live: 2 * sector size
+ *    the agfl for the ag in which the blocks live: 2 * sector size
+ *    the superblock for the free block count: sector size
+ *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_remove_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		MAX((mp->m_sb.sb_inodesize +
+		     mp->m_sb.sb_inodesize +
+		     XFS_DIROP_LOG_RES(mp) +
+		     128 * (2 + XFS_DIROP_LOG_COUNT(mp))),
+		    (2 * mp->m_sb.sb_sectsize +
+		     2 * mp->m_sb.sb_sectsize +
+		     mp->m_sb.sb_sectsize +
+		     XFS_ALLOCFREE_LOG_RES(mp, 2) +
+		     128 * (5 + XFS_ALLOCFREE_LOG_COUNT(mp, 2))));
+}
+
+/*
+ * For symlink we can modify:
+ *    the parent directory inode: inode size
+ *    the new inode: inode size
+ *    the inode btree entry: 1 block
+ *    the directory btree: (max depth + v2) * dir block size
+ *    the directory inode's bmap btree: (max depth + v2) * block size
+ *    the blocks for the symlink: 1 kB
+ * Or in the first xact we allocate some inodes giving:
+ *    the agi and agf of the ag getting the new inodes: 2 * sectorsize
+ *    the inode blocks allocated: XFS_IALLOC_BLOCKS * blocksize
+ *    the inode btree: max depth * blocksize
+ *    the allocation btrees: 2 trees * (2 * max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_symlink_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		MAX((mp->m_sb.sb_inodesize +
+		     mp->m_sb.sb_inodesize +
+		     XFS_FSB_TO_B(mp, 1) +
+		     XFS_DIROP_LOG_RES(mp) +
+		     1024 +
+		     128 * (4 + XFS_DIROP_LOG_COUNT(mp))),
+		    (2 * mp->m_sb.sb_sectsize +
+		     XFS_FSB_TO_B(mp, XFS_IALLOC_BLOCKS(mp)) +
+		     XFS_FSB_TO_B(mp, mp->m_in_maxlevels) +
+		     XFS_ALLOCFREE_LOG_RES(mp, 1) +
+		     128 * (2 + XFS_IALLOC_BLOCKS(mp) + mp->m_in_maxlevels +
+			    XFS_ALLOCFREE_LOG_COUNT(mp, 1))));
+}
+
+/*
+ * For create we can modify:
+ *    the parent directory inode: inode size
+ *    the new inode: inode size
+ *    the inode btree entry: block size
+ *    the superblock for the nlink flag: sector size
+ *    the directory btree: (max depth + v2) * dir block size
+ *    the directory inode's bmap btree: (max depth + v2) * block size
+ * Or in the first xact we allocate some inodes giving:
+ *    the agi and agf of the ag getting the new inodes: 2 * sectorsize
+ *    the superblock for the nlink flag: sector size
+ *    the inode blocks allocated: XFS_IALLOC_BLOCKS * blocksize
+ *    the inode btree: max depth * blocksize
+ *    the allocation btrees: 2 trees * (max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_create_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		MAX((mp->m_sb.sb_inodesize +
+		     mp->m_sb.sb_inodesize +
+		     mp->m_sb.sb_sectsize +
+		     XFS_FSB_TO_B(mp, 1) +
+		     XFS_DIROP_LOG_RES(mp) +
+		     128 * (3 + XFS_DIROP_LOG_COUNT(mp))),
+		    (3 * mp->m_sb.sb_sectsize +
+		     XFS_FSB_TO_B(mp, XFS_IALLOC_BLOCKS(mp)) +
+		     XFS_FSB_TO_B(mp, mp->m_in_maxlevels) +
+		     XFS_ALLOCFREE_LOG_RES(mp, 1) +
+		     128 * (2 + XFS_IALLOC_BLOCKS(mp) + mp->m_in_maxlevels +
+			    XFS_ALLOCFREE_LOG_COUNT(mp, 1))));
+}
+
+/*
+ * Making a new directory is the same as creating a new file.
+ */
+STATIC uint
+xfs_calc_mkdir_reservation(
+	struct xfs_mount	*mp)
+{
+	return xfs_calc_create_reservation(mp);
+}
+
+/*
+ * In freeing an inode we can modify:
+ *    the inode being freed: inode size
+ *    the super block free inode counter: sector size
+ *    the agi hash list and counters: sector size
+ *    the inode btree entry: block size
+ *    the on disk inode before ours in the agi hash list: inode cluster size
+ *    the inode btree: max depth * blocksize
+ *    the allocation btrees: 2 trees * (max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_ifree_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		mp->m_sb.sb_inodesize +
+		mp->m_sb.sb_sectsize +
+		mp->m_sb.sb_sectsize +
+		XFS_FSB_TO_B(mp, 1) +
+		MAX((__uint16_t)XFS_FSB_TO_B(mp, 1),
+		    XFS_INODE_CLUSTER_SIZE(mp)) +
+		128 * 5 +
+		XFS_ALLOCFREE_LOG_RES(mp, 1) +
+		128 * (2 + XFS_IALLOC_BLOCKS(mp) + mp->m_in_maxlevels +
+		       XFS_ALLOCFREE_LOG_COUNT(mp, 1));
+}
+
+/*
+ * When only changing the inode we log the inode and possibly the superblock
+ * We also add a bit of slop for the transaction stuff.
+ */
+STATIC uint
+xfs_calc_ichange_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		mp->m_sb.sb_inodesize +
+		mp->m_sb.sb_sectsize +
+		512;
+
+}
+
+/*
+ * Growing the data section of the filesystem.
+ *	superblock
+ *	agi and agf
+ *	allocation btrees
+ */
+STATIC uint
+xfs_calc_growdata_reservation(
+	struct xfs_mount	*mp)
+{
+	return mp->m_sb.sb_sectsize * 3 +
+		XFS_ALLOCFREE_LOG_RES(mp, 1) +
+		128 * (3 + XFS_ALLOCFREE_LOG_COUNT(mp, 1));
+}
+
+/*
+ * Growing the rt section of the filesystem.
+ * In the first set of transactions (ALLOC) we allocate space to the
+ * bitmap or summary files.
+ *	superblock: sector size
+ *	agf of the ag from which the extent is allocated: sector size
+ *	bmap btree for bitmap/summary inode: max depth * blocksize
+ *	bitmap/summary inode: inode size
+ *	allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize
+ */
+STATIC uint
+xfs_calc_growrtalloc_reservation(
+	struct xfs_mount	*mp)
+{
+	return 2 * mp->m_sb.sb_sectsize +
+		XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK)) +
+		mp->m_sb.sb_inodesize +
+		XFS_ALLOCFREE_LOG_RES(mp, 1) +
+		128 * (3 + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) +
+		       XFS_ALLOCFREE_LOG_COUNT(mp, 1));
+}
+
+/*
+ * Growing the rt section of the filesystem.
+ * In the second set of transactions (ZERO) we zero the new metadata blocks.
+ *	one bitmap/summary block: blocksize
+ */
+STATIC uint
+xfs_calc_growrtzero_reservation(
+	struct xfs_mount	*mp)
+{
+	return mp->m_sb.sb_blocksize + 128;
+}
+
+/*
+ * Growing the rt section of the filesystem.
+ * In the third set of transactions (FREE) we update metadata without
+ * allocating any new blocks.
+ *	superblock: sector size
+ *	bitmap inode: inode size
+ *	summary inode: inode size
+ *	one bitmap block: blocksize
+ *	summary blocks: new summary size
+ */
+STATIC uint
+xfs_calc_growrtfree_reservation(
+	struct xfs_mount	*mp)
+{
+	return mp->m_sb.sb_sectsize +
+		2 * mp->m_sb.sb_inodesize +
+		mp->m_sb.sb_blocksize +
+		mp->m_rsumsize +
+		128 * 5;
+}
+
+/*
+ * Logging the inode modification timestamp on a synchronous write.
+ *	inode
+ */
+STATIC uint
+xfs_calc_swrite_reservation(
+	struct xfs_mount	*mp)
+{
+	return mp->m_sb.sb_inodesize + 128;
+}
+
+/*
+ * Logging the inode mode bits when writing a setuid/setgid file
+ *	inode
+ */
+STATIC uint
+xfs_calc_writeid_reservation(xfs_mount_t *mp)
+{
+	return mp->m_sb.sb_inodesize + 128;
+}
+
+/*
+ * Converting the inode from non-attributed to attributed.
+ *	the inode being converted: inode size
+ *	agf block and superblock (for block allocation)
+ *	the new block (directory sized)
+ *	bmap blocks for the new directory block
+ *	allocation btrees
+ */
+STATIC uint
+xfs_calc_addafork_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		mp->m_sb.sb_inodesize +
+		mp->m_sb.sb_sectsize * 2 +
+		mp->m_dirblksize +
+		XFS_FSB_TO_B(mp, XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1) +
+		XFS_ALLOCFREE_LOG_RES(mp, 1) +
+		128 * (4 + XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1 +
+		       XFS_ALLOCFREE_LOG_COUNT(mp, 1));
+}
+
+/*
+ * Removing the attribute fork of a file
+ *    the inode being truncated: inode size
+ *    the inode's bmap btree: max depth * block size
+ * And the bmap_finish transaction can free the blocks and bmap blocks:
+ *    the agf for each of the ags: 4 * sector size
+ *    the agfl for each of the ags: 4 * sector size
+ *    the super block to reflect the freed blocks: sector size
+ *    worst case split in allocation btrees per extent assuming 4 extents:
+ *		4 exts * 2 trees * (2 * max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_attrinval_reservation(
+	struct xfs_mount	*mp)
+{
+	return MAX((mp->m_sb.sb_inodesize +
+		    XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) +
+		    128 * (1 + XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK))),
+		   (4 * mp->m_sb.sb_sectsize +
+		    4 * mp->m_sb.sb_sectsize +
+		    mp->m_sb.sb_sectsize +
+		    XFS_ALLOCFREE_LOG_RES(mp, 4) +
+		    128 * (9 + XFS_ALLOCFREE_LOG_COUNT(mp, 4))));
+}
+
+/*
+ * Setting an attribute.
+ *	the inode getting the attribute
+ *	the superblock for allocations
+ *	the agfs extents are allocated from
+ *	the attribute btree * max depth
+ *	the inode allocation btree
+ * Since attribute transaction space is dependent on the size of the attribute,
+ * the calculation is done partially at mount time and partially at runtime.
+ */
+STATIC uint
+xfs_calc_attrset_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		mp->m_sb.sb_inodesize +
+		mp->m_sb.sb_sectsize +
+		XFS_FSB_TO_B(mp, XFS_DA_NODE_MAXDEPTH) +
+		128 * (2 + XFS_DA_NODE_MAXDEPTH);
+}
+
+/*
+ * Removing an attribute.
+ *    the inode: inode size
+ *    the attribute btree could join: max depth * block size
+ *    the inode bmap btree could join or split: max depth * block size
+ * And the bmap_finish transaction can free the attr blocks freed giving:
+ *    the agf for the ag in which the blocks live: 2 * sector size
+ *    the agfl for the ag in which the blocks live: 2 * sector size
+ *    the superblock for the free block count: sector size
+ *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
+ */
+STATIC uint
+xfs_calc_attrrm_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_DQUOT_LOGRES(mp) +
+		MAX((mp->m_sb.sb_inodesize +
+		     XFS_FSB_TO_B(mp, XFS_DA_NODE_MAXDEPTH) +
+		     XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) +
+		     128 * (1 + XFS_DA_NODE_MAXDEPTH +
+			    XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK))),
+		    (2 * mp->m_sb.sb_sectsize +
+		     2 * mp->m_sb.sb_sectsize +
+		     mp->m_sb.sb_sectsize +
+		     XFS_ALLOCFREE_LOG_RES(mp, 2) +
+		     128 * (5 + XFS_ALLOCFREE_LOG_COUNT(mp, 2))));
+}
+
+/*
+ * Clearing a bad agino number in an agi hash bucket.
+ */
+STATIC uint
+xfs_calc_clear_agi_bucket_reservation(
+	struct xfs_mount	*mp)
+{
+	return mp->m_sb.sb_sectsize + 128;
+}
+
+/*
+ * Initialize the precomputed transaction reservation values
+ * in the mount structure.
+ */
+void
+xfs_trans_init(
+	struct xfs_mount	*mp)
+{
+	struct xfs_trans_reservations *resp = &mp->m_reservations;
+
+	resp->tr_write = xfs_calc_write_reservation(mp);
+	resp->tr_itruncate = xfs_calc_itruncate_reservation(mp);
+	resp->tr_rename = xfs_calc_rename_reservation(mp);
+	resp->tr_link = xfs_calc_link_reservation(mp);
+	resp->tr_remove = xfs_calc_remove_reservation(mp);
+	resp->tr_symlink = xfs_calc_symlink_reservation(mp);
+	resp->tr_create = xfs_calc_create_reservation(mp);
+	resp->tr_mkdir = xfs_calc_mkdir_reservation(mp);
+	resp->tr_ifree = xfs_calc_ifree_reservation(mp);
+	resp->tr_ichange = xfs_calc_ichange_reservation(mp);
+	resp->tr_growdata = xfs_calc_growdata_reservation(mp);
+	resp->tr_swrite = xfs_calc_swrite_reservation(mp);
+	resp->tr_writeid = xfs_calc_writeid_reservation(mp);
+	resp->tr_addafork = xfs_calc_addafork_reservation(mp);
+	resp->tr_attrinval = xfs_calc_attrinval_reservation(mp);
+	resp->tr_attrset = xfs_calc_attrset_reservation(mp);
+	resp->tr_attrrm = xfs_calc_attrrm_reservation(mp);
+	resp->tr_clearagi = xfs_calc_clear_agi_bucket_reservation(mp);
+	resp->tr_growrtalloc = xfs_calc_growrtalloc_reservation(mp);
+	resp->tr_growrtzero = xfs_calc_growrtzero_reservation(mp);
+	resp->tr_growrtfree = xfs_calc_growrtfree_reservation(mp);
+}
+
+/*
+ * This routine is called to allocate a transaction structure.
+ * The type parameter indicates the type of the transaction.  These
+ * are enumerated in xfs_trans.h.
+ *
+ * Dynamically allocate the transaction structure from the transaction
+ * zone, initialize it, and return it to the caller.
+ */
+xfs_trans_t *
+xfs_trans_alloc(
+	xfs_mount_t	*mp,
+	uint		type)
+{
+	xfs_wait_for_freeze(mp, SB_FREEZE_TRANS);
+	return _xfs_trans_alloc(mp, type, KM_SLEEP);
+}
+
+xfs_trans_t *
+_xfs_trans_alloc(
+	xfs_mount_t	*mp,
+	uint		type,
+	uint		memflags)
+{
+	xfs_trans_t	*tp;
+
+	atomic_inc(&mp->m_active_trans);
+
+	tp = kmem_zone_zalloc(xfs_trans_zone, memflags);
+	tp->t_magic = XFS_TRANS_MAGIC;
+	tp->t_type = type;
+	tp->t_mountp = mp;
+	INIT_LIST_HEAD(&tp->t_items);
+	INIT_LIST_HEAD(&tp->t_busy);
+	return tp;
+}
+
+/*
+ * Free the transaction structure.  If there is more clean up
+ * to do when the structure is freed, add it here.
+ */
+STATIC void
+xfs_trans_free(
+	struct xfs_trans	*tp)
+{
+	xfs_alloc_busy_sort(&tp->t_busy);
+	xfs_alloc_busy_clear(tp->t_mountp, &tp->t_busy, false);
+
+	atomic_dec(&tp->t_mountp->m_active_trans);
+	xfs_trans_free_dqinfo(tp);
+	kmem_zone_free(xfs_trans_zone, tp);
+}
+
+/*
+ * This is called to create a new transaction which will share the
+ * permanent log reservation of the given transaction.  The remaining
+ * unused block and rt extent reservations are also inherited.  This
+ * implies that the original transaction is no longer allowed to allocate
+ * blocks.  Locks and log items, however, are no inherited.  They must
+ * be added to the new transaction explicitly.
+ */
+xfs_trans_t *
+xfs_trans_dup(
+	xfs_trans_t	*tp)
+{
+	xfs_trans_t	*ntp;
+
+	ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
+
+	/*
+	 * Initialize the new transaction structure.
+	 */
+	ntp->t_magic = XFS_TRANS_MAGIC;
+	ntp->t_type = tp->t_type;
+	ntp->t_mountp = tp->t_mountp;
+	INIT_LIST_HEAD(&ntp->t_items);
+	INIT_LIST_HEAD(&ntp->t_busy);
+
+	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
+	ASSERT(tp->t_ticket != NULL);
+
+	ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE);
+	ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
+	ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
+	tp->t_blk_res = tp->t_blk_res_used;
+	ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
+	tp->t_rtx_res = tp->t_rtx_res_used;
+	ntp->t_pflags = tp->t_pflags;
+
+	xfs_trans_dup_dqinfo(tp, ntp);
+
+	atomic_inc(&tp->t_mountp->m_active_trans);
+	return ntp;
+}
+
+/*
+ * This is called to reserve free disk blocks and log space for the
+ * given transaction.  This must be done before allocating any resources
+ * within the transaction.
+ *
+ * This will return ENOSPC if there are not enough blocks available.
+ * It will sleep waiting for available log space.
+ * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
+ * is used by long running transactions.  If any one of the reservations
+ * fails then they will all be backed out.
+ *
+ * This does not do quota reservations. That typically is done by the
+ * caller afterwards.
+ */
+int
+xfs_trans_reserve(
+	xfs_trans_t	*tp,
+	uint		blocks,
+	uint		logspace,
+	uint		rtextents,
+	uint		flags,
+	uint		logcount)
+{
+	int		error = 0;
+	int		rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
+
+	/* Mark this thread as being in a transaction */
+	current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
+
+	/*
+	 * Attempt to reserve the needed disk blocks by decrementing
+	 * the number needed from the number available.  This will
+	 * fail if the count would go below zero.
+	 */
+	if (blocks > 0) {
+		error = xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS,
+					  -((int64_t)blocks), rsvd);
+		if (error != 0) {
+			current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+			return (XFS_ERROR(ENOSPC));
+		}
+		tp->t_blk_res += blocks;
+	}
+
+	/*
+	 * Reserve the log space needed for this transaction.
+	 */
+	if (logspace > 0) {
+		bool	permanent = false;
+
+		ASSERT(tp->t_log_res == 0 || tp->t_log_res == logspace);
+		ASSERT(tp->t_log_count == 0 || tp->t_log_count == logcount);
+
+		if (flags & XFS_TRANS_PERM_LOG_RES) {
+			tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
+			permanent = true;
+		} else {
+			ASSERT(tp->t_ticket == NULL);
+			ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
+		}
+
+		if (tp->t_ticket != NULL) {
+			ASSERT(flags & XFS_TRANS_PERM_LOG_RES);
+			error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
+		} else {
+			error = xfs_log_reserve(tp->t_mountp, logspace,
+						logcount, &tp->t_ticket,
+						XFS_TRANSACTION, permanent,
+						tp->t_type);
+		}
+
+		if (error)
+			goto undo_blocks;
+
+		tp->t_log_res = logspace;
+		tp->t_log_count = logcount;
+	}
+
+	/*
+	 * Attempt to reserve the needed realtime extents by decrementing
+	 * the number needed from the number available.  This will
+	 * fail if the count would go below zero.
+	 */
+	if (rtextents > 0) {
+		error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
+					  -((int64_t)rtextents), rsvd);
+		if (error) {
+			error = XFS_ERROR(ENOSPC);
+			goto undo_log;
+		}
+		tp->t_rtx_res += rtextents;
+	}
+
+	return 0;
+
+	/*
+	 * Error cases jump to one of these labels to undo any
+	 * reservations which have already been performed.
+	 */
+undo_log:
+	if (logspace > 0) {
+		int		log_flags;
+
+		if (flags & XFS_TRANS_PERM_LOG_RES) {
+			log_flags = XFS_LOG_REL_PERM_RESERV;
+		} else {
+			log_flags = 0;
+		}
+		xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
+		tp->t_ticket = NULL;
+		tp->t_log_res = 0;
+		tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
+	}
+
+undo_blocks:
+	if (blocks > 0) {
+		xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS,
+					 (int64_t)blocks, rsvd);
+		tp->t_blk_res = 0;
+	}
+
+	current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+
+	return error;
+}
+
+/*
+ * Record the indicated change to the given field for application
+ * to the file system's superblock when the transaction commits.
+ * For now, just store the change in the transaction structure.
+ *
+ * Mark the transaction structure to indicate that the superblock
+ * needs to be updated before committing.
+ *
+ * Because we may not be keeping track of allocated/free inodes and
+ * used filesystem blocks in the superblock, we do not mark the
+ * superblock dirty in this transaction if we modify these fields.
+ * We still need to update the transaction deltas so that they get
+ * applied to the incore superblock, but we don't want them to
+ * cause the superblock to get locked and logged if these are the
+ * only fields in the superblock that the transaction modifies.
+ */
+void
+xfs_trans_mod_sb(
+	xfs_trans_t	*tp,
+	uint		field,
+	int64_t		delta)
+{
+	uint32_t	flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
+	xfs_mount_t	*mp = tp->t_mountp;
+
+	switch (field) {
+	case XFS_TRANS_SB_ICOUNT:
+		tp->t_icount_delta += delta;
+		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+			flags &= ~XFS_TRANS_SB_DIRTY;
+		break;
+	case XFS_TRANS_SB_IFREE:
+		tp->t_ifree_delta += delta;
+		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+			flags &= ~XFS_TRANS_SB_DIRTY;
+		break;
+	case XFS_TRANS_SB_FDBLOCKS:
+		/*
+		 * Track the number of blocks allocated in the
+		 * transaction.  Make sure it does not exceed the
+		 * number reserved.
+		 */
+		if (delta < 0) {
+			tp->t_blk_res_used += (uint)-delta;
+			ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
+		}
+		tp->t_fdblocks_delta += delta;
+		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+			flags &= ~XFS_TRANS_SB_DIRTY;
+		break;
+	case XFS_TRANS_SB_RES_FDBLOCKS:
+		/*
+		 * The allocation has already been applied to the
+		 * in-core superblock's counter.  This should only
+		 * be applied to the on-disk superblock.
+		 */
+		ASSERT(delta < 0);
+		tp->t_res_fdblocks_delta += delta;
+		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+			flags &= ~XFS_TRANS_SB_DIRTY;
+		break;
+	case XFS_TRANS_SB_FREXTENTS:
+		/*
+		 * Track the number of blocks allocated in the
+		 * transaction.  Make sure it does not exceed the
+		 * number reserved.
+		 */
+		if (delta < 0) {
+			tp->t_rtx_res_used += (uint)-delta;
+			ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
+		}
+		tp->t_frextents_delta += delta;
+		break;
+	case XFS_TRANS_SB_RES_FREXTENTS:
+		/*
+		 * The allocation has already been applied to the
+		 * in-core superblock's counter.  This should only
+		 * be applied to the on-disk superblock.
+		 */
+		ASSERT(delta < 0);
+		tp->t_res_frextents_delta += delta;
+		break;
+	case XFS_TRANS_SB_DBLOCKS:
+		ASSERT(delta > 0);
+		tp->t_dblocks_delta += delta;
+		break;
+	case XFS_TRANS_SB_AGCOUNT:
+		ASSERT(delta > 0);
+		tp->t_agcount_delta += delta;
+		break;
+	case XFS_TRANS_SB_IMAXPCT:
+		tp->t_imaxpct_delta += delta;
+		break;
+	case XFS_TRANS_SB_REXTSIZE:
+		tp->t_rextsize_delta += delta;
+		break;
+	case XFS_TRANS_SB_RBMBLOCKS:
+		tp->t_rbmblocks_delta += delta;
+		break;
+	case XFS_TRANS_SB_RBLOCKS:
+		tp->t_rblocks_delta += delta;
+		break;
+	case XFS_TRANS_SB_REXTENTS:
+		tp->t_rextents_delta += delta;
+		break;
+	case XFS_TRANS_SB_REXTSLOG:
+		tp->t_rextslog_delta += delta;
+		break;
+	default:
+		ASSERT(0);
+		return;
+	}
+
+	tp->t_flags |= flags;
+}
+
+/*
+ * xfs_trans_apply_sb_deltas() is called from the commit code
+ * to bring the superblock buffer into the current transaction
+ * and modify it as requested by earlier calls to xfs_trans_mod_sb().
+ *
+ * For now we just look at each field allowed to change and change
+ * it if necessary.
+ */
+STATIC void
+xfs_trans_apply_sb_deltas(
+	xfs_trans_t	*tp)
+{
+	xfs_dsb_t	*sbp;
+	xfs_buf_t	*bp;
+	int		whole = 0;
+
+	bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
+	sbp = XFS_BUF_TO_SBP(bp);
+
+	/*
+	 * Check that superblock mods match the mods made to AGF counters.
+	 */
+	ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
+	       (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
+		tp->t_ag_btree_delta));
+
+	/*
+	 * Only update the superblock counters if we are logging them
+	 */
+	if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
+		if (tp->t_icount_delta)
+			be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
+		if (tp->t_ifree_delta)
+			be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
+		if (tp->t_fdblocks_delta)
+			be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
+		if (tp->t_res_fdblocks_delta)
+			be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
+	}
+
+	if (tp->t_frextents_delta)
+		be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
+	if (tp->t_res_frextents_delta)
+		be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
+
+	if (tp->t_dblocks_delta) {
+		be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
+		whole = 1;
+	}
+	if (tp->t_agcount_delta) {
+		be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
+		whole = 1;
+	}
+	if (tp->t_imaxpct_delta) {
+		sbp->sb_imax_pct += tp->t_imaxpct_delta;
+		whole = 1;
+	}
+	if (tp->t_rextsize_delta) {
+		be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
+		whole = 1;
+	}
+	if (tp->t_rbmblocks_delta) {
+		be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
+		whole = 1;
+	}
+	if (tp->t_rblocks_delta) {
+		be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
+		whole = 1;
+	}
+	if (tp->t_rextents_delta) {
+		be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
+		whole = 1;
+	}
+	if (tp->t_rextslog_delta) {
+		sbp->sb_rextslog += tp->t_rextslog_delta;
+		whole = 1;
+	}
+
+	if (whole)
+		/*
+		 * Log the whole thing, the fields are noncontiguous.
+		 */
+		xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
+	else
+		/*
+		 * Since all the modifiable fields are contiguous, we
+		 * can get away with this.
+		 */
+		xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
+				  offsetof(xfs_dsb_t, sb_frextents) +
+				  sizeof(sbp->sb_frextents) - 1);
+}
+
+/*
+ * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
+ * and apply superblock counter changes to the in-core superblock.  The
+ * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
+ * applied to the in-core superblock.  The idea is that that has already been
+ * done.
+ *
+ * This is done efficiently with a single call to xfs_mod_incore_sb_batch().
+ * However, we have to ensure that we only modify each superblock field only
+ * once because the application of the delta values may not be atomic. That can
+ * lead to ENOSPC races occurring if we have two separate modifcations of the
+ * free space counter to put back the entire reservation and then take away
+ * what we used.
+ *
+ * If we are not logging superblock counters, then the inode allocated/free and
+ * used block counts are not updated in the on disk superblock. In this case,
+ * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
+ * still need to update the incore superblock with the changes.
+ */
+void
+xfs_trans_unreserve_and_mod_sb(
+	xfs_trans_t	*tp)
+{
+	xfs_mod_sb_t	msb[9];	/* If you add cases, add entries */
+	xfs_mod_sb_t	*msbp;
+	xfs_mount_t	*mp = tp->t_mountp;
+	/* REFERENCED */
+	int		error;
+	int		rsvd;
+	int64_t		blkdelta = 0;
+	int64_t		rtxdelta = 0;
+	int64_t		idelta = 0;
+	int64_t		ifreedelta = 0;
+
+	msbp = msb;
+	rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
+
+	/* calculate deltas */
+	if (tp->t_blk_res > 0)
+		blkdelta = tp->t_blk_res;
+	if ((tp->t_fdblocks_delta != 0) &&
+	    (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
+	     (tp->t_flags & XFS_TRANS_SB_DIRTY)))
+	        blkdelta += tp->t_fdblocks_delta;
+
+	if (tp->t_rtx_res > 0)
+		rtxdelta = tp->t_rtx_res;
+	if ((tp->t_frextents_delta != 0) &&
+	    (tp->t_flags & XFS_TRANS_SB_DIRTY))
+		rtxdelta += tp->t_frextents_delta;
+
+	if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
+	     (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
+		idelta = tp->t_icount_delta;
+		ifreedelta = tp->t_ifree_delta;
+	}
+
+	/* apply the per-cpu counters */
+	if (blkdelta) {
+		error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
+						 blkdelta, rsvd);
+		if (error)
+			goto out;
+	}
+
+	if (idelta) {
+		error = xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT,
+						 idelta, rsvd);
+		if (error)
+			goto out_undo_fdblocks;
+	}
+
+	if (ifreedelta) {
+		error = xfs_icsb_modify_counters(mp, XFS_SBS_IFREE,
+						 ifreedelta, rsvd);
+		if (error)
+			goto out_undo_icount;
+	}
+
+	/* apply remaining deltas */
+	if (rtxdelta != 0) {
+		msbp->msb_field = XFS_SBS_FREXTENTS;
+		msbp->msb_delta = rtxdelta;
+		msbp++;
+	}
+
+	if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
+		if (tp->t_dblocks_delta != 0) {
+			msbp->msb_field = XFS_SBS_DBLOCKS;
+			msbp->msb_delta = tp->t_dblocks_delta;
+			msbp++;
+		}
+		if (tp->t_agcount_delta != 0) {
+			msbp->msb_field = XFS_SBS_AGCOUNT;
+			msbp->msb_delta = tp->t_agcount_delta;
+			msbp++;
+		}
+		if (tp->t_imaxpct_delta != 0) {
+			msbp->msb_field = XFS_SBS_IMAX_PCT;
+			msbp->msb_delta = tp->t_imaxpct_delta;
+			msbp++;
+		}
+		if (tp->t_rextsize_delta != 0) {
+			msbp->msb_field = XFS_SBS_REXTSIZE;
+			msbp->msb_delta = tp->t_rextsize_delta;
+			msbp++;
+		}
+		if (tp->t_rbmblocks_delta != 0) {
+			msbp->msb_field = XFS_SBS_RBMBLOCKS;
+			msbp->msb_delta = tp->t_rbmblocks_delta;
+			msbp++;
+		}
+		if (tp->t_rblocks_delta != 0) {
+			msbp->msb_field = XFS_SBS_RBLOCKS;
+			msbp->msb_delta = tp->t_rblocks_delta;
+			msbp++;
+		}
+		if (tp->t_rextents_delta != 0) {
+			msbp->msb_field = XFS_SBS_REXTENTS;
+			msbp->msb_delta = tp->t_rextents_delta;
+			msbp++;
+		}
+		if (tp->t_rextslog_delta != 0) {
+			msbp->msb_field = XFS_SBS_REXTSLOG;
+			msbp->msb_delta = tp->t_rextslog_delta;
+			msbp++;
+		}
+	}
+
+	/*
+	 * If we need to change anything, do it.
+	 */
+	if (msbp > msb) {
+		error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
+			(uint)(msbp - msb), rsvd);
+		if (error)
+			goto out_undo_ifreecount;
+	}
+
+	return;
+
+out_undo_ifreecount:
+	if (ifreedelta)
+		xfs_icsb_modify_counters(mp, XFS_SBS_IFREE, -ifreedelta, rsvd);
+out_undo_icount:
+	if (idelta)
+		xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT, -idelta, rsvd);
+out_undo_fdblocks:
+	if (blkdelta)
+		xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, -blkdelta, rsvd);
+out:
+	ASSERT(error == 0);
+	return;
+}
+
+/*
+ * Add the given log item to the transaction's list of log items.
+ *
+ * The log item will now point to its new descriptor with its li_desc field.
+ */
+void
+xfs_trans_add_item(
+	struct xfs_trans	*tp,
+	struct xfs_log_item	*lip)
+{
+	struct xfs_log_item_desc *lidp;
+
+	ASSERT(lip->li_mountp == tp->t_mountp);
+	ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
+
+	lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
+
+	lidp->lid_item = lip;
+	lidp->lid_flags = 0;
+	list_add_tail(&lidp->lid_trans, &tp->t_items);
+
+	lip->li_desc = lidp;
+}
+
+STATIC void
+xfs_trans_free_item_desc(
+	struct xfs_log_item_desc *lidp)
+{
+	list_del_init(&lidp->lid_trans);
+	kmem_zone_free(xfs_log_item_desc_zone, lidp);
+}
+
+/*
+ * Unlink and free the given descriptor.
+ */
+void
+xfs_trans_del_item(
+	struct xfs_log_item	*lip)
+{
+	xfs_trans_free_item_desc(lip->li_desc);
+	lip->li_desc = NULL;
+}
+
+/*
+ * Unlock all of the items of a transaction and free all the descriptors
+ * of that transaction.
+ */
+void
+xfs_trans_free_items(
+	struct xfs_trans	*tp,
+	xfs_lsn_t		commit_lsn,
+	int			flags)
+{
+	struct xfs_log_item_desc *lidp, *next;
+
+	list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
+		struct xfs_log_item	*lip = lidp->lid_item;
+
+		lip->li_desc = NULL;
+
+		if (commit_lsn != NULLCOMMITLSN)
+			IOP_COMMITTING(lip, commit_lsn);
+		if (flags & XFS_TRANS_ABORT)
+			lip->li_flags |= XFS_LI_ABORTED;
+		IOP_UNLOCK(lip);
+
+		xfs_trans_free_item_desc(lidp);
+	}
+}
+
+static inline void
+xfs_log_item_batch_insert(
+	struct xfs_ail		*ailp,
+	struct xfs_ail_cursor	*cur,
+	struct xfs_log_item	**log_items,
+	int			nr_items,
+	xfs_lsn_t		commit_lsn)
+{
+	int	i;
+
+	spin_lock(&ailp->xa_lock);
+	/* xfs_trans_ail_update_bulk drops ailp->xa_lock */
+	xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
+
+	for (i = 0; i < nr_items; i++)
+		IOP_UNPIN(log_items[i], 0);
+}
+
+/*
+ * Bulk operation version of xfs_trans_committed that takes a log vector of
+ * items to insert into the AIL. This uses bulk AIL insertion techniques to
+ * minimise lock traffic.
+ *
+ * If we are called with the aborted flag set, it is because a log write during
+ * a CIL checkpoint commit has failed. In this case, all the items in the
+ * checkpoint have already gone through IOP_COMMITED and IOP_UNLOCK, which
+ * means that checkpoint commit abort handling is treated exactly the same
+ * as an iclog write error even though we haven't started any IO yet. Hence in
+ * this case all we need to do is IOP_COMMITTED processing, followed by an
+ * IOP_UNPIN(aborted) call.
+ *
+ * The AIL cursor is used to optimise the insert process. If commit_lsn is not
+ * at the end of the AIL, the insert cursor avoids the need to walk
+ * the AIL to find the insertion point on every xfs_log_item_batch_insert()
+ * call. This saves a lot of needless list walking and is a net win, even
+ * though it slightly increases that amount of AIL lock traffic to set it up
+ * and tear it down.
+ */
+void
+xfs_trans_committed_bulk(
+	struct xfs_ail		*ailp,
+	struct xfs_log_vec	*log_vector,
+	xfs_lsn_t		commit_lsn,
+	int			aborted)
+{
+#define LOG_ITEM_BATCH_SIZE	32
+	struct xfs_log_item	*log_items[LOG_ITEM_BATCH_SIZE];
+	struct xfs_log_vec	*lv;
+	struct xfs_ail_cursor	cur;
+	int			i = 0;
+
+	spin_lock(&ailp->xa_lock);
+	xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
+	spin_unlock(&ailp->xa_lock);
+
+	/* unpin all the log items */
+	for (lv = log_vector; lv; lv = lv->lv_next ) {
+		struct xfs_log_item	*lip = lv->lv_item;
+		xfs_lsn_t		item_lsn;
+
+		if (aborted)
+			lip->li_flags |= XFS_LI_ABORTED;
+		item_lsn = IOP_COMMITTED(lip, commit_lsn);
+
+		/* item_lsn of -1 means the item needs no further processing */
+		if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
+			continue;
+
+		/*
+		 * if we are aborting the operation, no point in inserting the
+		 * object into the AIL as we are in a shutdown situation.
+		 */
+		if (aborted) {
+			ASSERT(XFS_FORCED_SHUTDOWN(ailp->xa_mount));
+			IOP_UNPIN(lip, 1);
+			continue;
+		}
+
+		if (item_lsn != commit_lsn) {
+
+			/*
+			 * Not a bulk update option due to unusual item_lsn.
+			 * Push into AIL immediately, rechecking the lsn once
+			 * we have the ail lock. Then unpin the item. This does
+			 * not affect the AIL cursor the bulk insert path is
+			 * using.
+			 */
+			spin_lock(&ailp->xa_lock);
+			if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
+				xfs_trans_ail_update(ailp, lip, item_lsn);
+			else
+				spin_unlock(&ailp->xa_lock);
+			IOP_UNPIN(lip, 0);
+			continue;
+		}
+
+		/* Item is a candidate for bulk AIL insert.  */
+		log_items[i++] = lv->lv_item;
+		if (i >= LOG_ITEM_BATCH_SIZE) {
+			xfs_log_item_batch_insert(ailp, &cur, log_items,
+					LOG_ITEM_BATCH_SIZE, commit_lsn);
+			i = 0;
+		}
+	}
+
+	/* make sure we insert the remainder! */
+	if (i)
+		xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
+
+	spin_lock(&ailp->xa_lock);
+	xfs_trans_ail_cursor_done(ailp, &cur);
+	spin_unlock(&ailp->xa_lock);
+}
+
+/*
+ * Commit the given transaction to the log.
+ *
+ * XFS disk error handling mechanism is not based on a typical
+ * transaction abort mechanism. Logically after the filesystem
+ * gets marked 'SHUTDOWN', we can't let any new transactions
+ * be durable - ie. committed to disk - because some metadata might
+ * be inconsistent. In such cases, this returns an error, and the
+ * caller may assume that all locked objects joined to the transaction
+ * have already been unlocked as if the commit had succeeded.
+ * Do not reference the transaction structure after this call.
+ */
+int
+xfs_trans_commit(
+	struct xfs_trans	*tp,
+	uint			flags)
+{
+	struct xfs_mount	*mp = tp->t_mountp;
+	xfs_lsn_t		commit_lsn = -1;
+	int			error = 0;
+	int			log_flags = 0;
+	int			sync = tp->t_flags & XFS_TRANS_SYNC;
+
+	/*
+	 * Determine whether this commit is releasing a permanent
+	 * log reservation or not.
+	 */
+	if (flags & XFS_TRANS_RELEASE_LOG_RES) {
+		ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
+		log_flags = XFS_LOG_REL_PERM_RESERV;
+	}
+
+	/*
+	 * If there is nothing to be logged by the transaction,
+	 * then unlock all of the items associated with the
+	 * transaction and free the transaction structure.
+	 * Also make sure to return any reserved blocks to
+	 * the free pool.
+	 */
+	if (!(tp->t_flags & XFS_TRANS_DIRTY))
+		goto out_unreserve;
+
+	if (XFS_FORCED_SHUTDOWN(mp)) {
+		error = XFS_ERROR(EIO);
+		goto out_unreserve;
+	}
+
+	ASSERT(tp->t_ticket != NULL);
+
+	/*
+	 * If we need to update the superblock, then do it now.
+	 */
+	if (tp->t_flags & XFS_TRANS_SB_DIRTY)
+		xfs_trans_apply_sb_deltas(tp);
+	xfs_trans_apply_dquot_deltas(tp);
+
+	error = xfs_log_commit_cil(mp, tp, &commit_lsn, flags);
+	if (error == ENOMEM) {
+		xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
+		error = XFS_ERROR(EIO);
+		goto out_unreserve;
+	}
+
+	current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+	xfs_trans_free(tp);
+
+	/*
+	 * If the transaction needs to be synchronous, then force the
+	 * log out now and wait for it.
+	 */
+	if (sync) {
+		if (!error) {
+			error = _xfs_log_force_lsn(mp, commit_lsn,
+				      XFS_LOG_SYNC, NULL);
+		}
+		XFS_STATS_INC(xs_trans_sync);
+	} else {
+		XFS_STATS_INC(xs_trans_async);
+	}
+
+	return error;
+
+out_unreserve:
+	xfs_trans_unreserve_and_mod_sb(tp);
+
+	/*
+	 * It is indeed possible for the transaction to be not dirty but
+	 * the dqinfo portion to be.  All that means is that we have some
+	 * (non-persistent) quota reservations that need to be unreserved.
+	 */
+	xfs_trans_unreserve_and_mod_dquots(tp);
+	if (tp->t_ticket) {
+		commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
+		if (commit_lsn == -1 && !error)
+			error = XFS_ERROR(EIO);
+	}
+	current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+	xfs_trans_free_items(tp, NULLCOMMITLSN, error ? XFS_TRANS_ABORT : 0);
+	xfs_trans_free(tp);
+
+	XFS_STATS_INC(xs_trans_empty);
+	return error;
+}
+
+/*
+ * Unlock all of the transaction's items and free the transaction.
+ * The transaction must not have modified any of its items, because
+ * there is no way to restore them to their previous state.
+ *
+ * If the transaction has made a log reservation, make sure to release
+ * it as well.
+ */
+void
+xfs_trans_cancel(
+	xfs_trans_t		*tp,
+	int			flags)
+{
+	int			log_flags;
+	xfs_mount_t		*mp = tp->t_mountp;
+
+	/*
+	 * See if the caller is being too lazy to figure out if
+	 * the transaction really needs an abort.
+	 */
+	if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
+		flags &= ~XFS_TRANS_ABORT;
+	/*
+	 * See if the caller is relying on us to shut down the
+	 * filesystem.  This happens in paths where we detect
+	 * corruption and decide to give up.
+	 */
+	if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
+		XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
+		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+	}
+#ifdef DEBUG
+	if (!(flags & XFS_TRANS_ABORT) && !XFS_FORCED_SHUTDOWN(mp)) {
+		struct xfs_log_item_desc *lidp;
+
+		list_for_each_entry(lidp, &tp->t_items, lid_trans)
+			ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
+	}
+#endif
+	xfs_trans_unreserve_and_mod_sb(tp);
+	xfs_trans_unreserve_and_mod_dquots(tp);
+
+	if (tp->t_ticket) {
+		if (flags & XFS_TRANS_RELEASE_LOG_RES) {
+			ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
+			log_flags = XFS_LOG_REL_PERM_RESERV;
+		} else {
+			log_flags = 0;
+		}
+		xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
+	}
+
+	/* mark this thread as no longer being in a transaction */
+	current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
+
+	xfs_trans_free_items(tp, NULLCOMMITLSN, flags);
+	xfs_trans_free(tp);
+}
+
+/*
+ * Roll from one trans in the sequence of PERMANENT transactions to
+ * the next: permanent transactions are only flushed out when
+ * committed with XFS_TRANS_RELEASE_LOG_RES, but we still want as soon
+ * as possible to let chunks of it go to the log. So we commit the
+ * chunk we've been working on and get a new transaction to continue.
+ */
+int
+xfs_trans_roll(
+	struct xfs_trans	**tpp,
+	struct xfs_inode	*dp)
+{
+	struct xfs_trans	*trans;
+	unsigned int		logres, count;
+	int			error;
+
+	/*
+	 * Ensure that the inode is always logged.
+	 */
+	trans = *tpp;
+	xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
+
+	/*
+	 * Copy the critical parameters from one trans to the next.
+	 */
+	logres = trans->t_log_res;
+	count = trans->t_log_count;
+	*tpp = xfs_trans_dup(trans);
+
+	/*
+	 * Commit the current transaction.
+	 * If this commit failed, then it'd just unlock those items that
+	 * are not marked ihold. That also means that a filesystem shutdown
+	 * is in progress. The caller takes the responsibility to cancel
+	 * the duplicate transaction that gets returned.
+	 */
+	error = xfs_trans_commit(trans, 0);
+	if (error)
+		return (error);
+
+	trans = *tpp;
+
+	/*
+	 * transaction commit worked ok so we can drop the extra ticket
+	 * reference that we gained in xfs_trans_dup()
+	 */
+	xfs_log_ticket_put(trans->t_ticket);
+
+
+	/*
+	 * Reserve space in the log for th next transaction.
+	 * This also pushes items in the "AIL", the list of logged items,
+	 * out to disk if they are taking up space at the tail of the log
+	 * that we want to use.  This requires that either nothing be locked
+	 * across this call, or that anything that is locked be logged in
+	 * the prior and the next transactions.
+	 */
+	error = xfs_trans_reserve(trans, 0, logres, 0,
+				  XFS_TRANS_PERM_LOG_RES, count);
+	/*
+	 *  Ensure that the inode is in the new transaction and locked.
+	 */
+	if (error)
+		return error;
+
+	xfs_trans_ijoin(trans, dp, 0);
+	return 0;
+}