Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1012 insertions, 0 deletions

diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
new file mode 100644
index 000000000..ca2941ab6
--- /dev/null
+++ b/fs/xfs/xfs_inode_item.c
@@ -0,0 +1,1012 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_trans.h"
+#include "xfs_inode_item.h"
+#include "xfs_trace.h"
+#include "xfs_trans_priv.h"
+#include "xfs_buf_item.h"
+#include "xfs_log.h"
+#include "xfs_log_priv.h"
+#include "xfs_error.h"
+
+#include <linux/iversion.h>
+
+struct kmem_cache	*xfs_ili_cache;		/* inode log item */
+
+static inline struct xfs_inode_log_item *INODE_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_inode_log_item, ili_item);
+}
+
+/*
+ * The logged size of an inode fork is always the current size of the inode
+ * fork. This means that when an inode fork is relogged, the size of the logged
+ * region is determined by the current state, not the combination of the
+ * previously logged state + the current state. This is different relogging
+ * behaviour to most other log items which will retain the size of the
+ * previously logged changes when smaller regions are relogged.
+ *
+ * Hence operations that remove data from the inode fork (e.g. shortform
+ * dir/attr remove, extent form extent removal, etc), the size of the relogged
+ * inode gets -smaller- rather than stays the same size as the previously logged
+ * size and this can result in the committing transaction reducing the amount of
+ * space being consumed by the CIL.
+ */
+STATIC void
+xfs_inode_item_data_fork_size(
+	struct xfs_inode_log_item *iip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	struct xfs_inode	*ip = iip->ili_inode;
+
+	switch (ip->i_df.if_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		if ((iip->ili_fields & XFS_ILOG_DEXT) &&
+		    ip->i_df.if_nextents > 0 &&
+		    ip->i_df.if_bytes > 0) {
+			/* worst case, doesn't subtract delalloc extents */
+			*nbytes += xfs_inode_data_fork_size(ip);
+			*nvecs += 1;
+		}
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
+		    ip->i_df.if_broot_bytes > 0) {
+			*nbytes += ip->i_df.if_broot_bytes;
+			*nvecs += 1;
+		}
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+		if ((iip->ili_fields & XFS_ILOG_DDATA) &&
+		    ip->i_df.if_bytes > 0) {
+			*nbytes += xlog_calc_iovec_len(ip->i_df.if_bytes);
+			*nvecs += 1;
+		}
+		break;
+
+	case XFS_DINODE_FMT_DEV:
+		break;
+	default:
+		ASSERT(0);
+		break;
+	}
+}
+
+STATIC void
+xfs_inode_item_attr_fork_size(
+	struct xfs_inode_log_item *iip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	struct xfs_inode	*ip = iip->ili_inode;
+
+	switch (ip->i_af.if_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		if ((iip->ili_fields & XFS_ILOG_AEXT) &&
+		    ip->i_af.if_nextents > 0 &&
+		    ip->i_af.if_bytes > 0) {
+			/* worst case, doesn't subtract unused space */
+			*nbytes += xfs_inode_attr_fork_size(ip);
+			*nvecs += 1;
+		}
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
+		    ip->i_af.if_broot_bytes > 0) {
+			*nbytes += ip->i_af.if_broot_bytes;
+			*nvecs += 1;
+		}
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+		if ((iip->ili_fields & XFS_ILOG_ADATA) &&
+		    ip->i_af.if_bytes > 0) {
+			*nbytes += xlog_calc_iovec_len(ip->i_af.if_bytes);
+			*nvecs += 1;
+		}
+		break;
+	default:
+		ASSERT(0);
+		break;
+	}
+}
+
+/*
+ * This returns the number of iovecs needed to log the given inode item.
+ *
+ * We need one iovec for the inode log format structure, one for the
+ * inode core, and possibly one for the inode data/extents/b-tree root
+ * and one for the inode attribute data/extents/b-tree root.
+ */
+STATIC void
+xfs_inode_item_size(
+	struct xfs_log_item	*lip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
+	struct xfs_inode	*ip = iip->ili_inode;
+
+	*nvecs += 2;
+	*nbytes += sizeof(struct xfs_inode_log_format) +
+		   xfs_log_dinode_size(ip->i_mount);
+
+	xfs_inode_item_data_fork_size(iip, nvecs, nbytes);
+	if (xfs_inode_has_attr_fork(ip))
+		xfs_inode_item_attr_fork_size(iip, nvecs, nbytes);
+}
+
+STATIC void
+xfs_inode_item_format_data_fork(
+	struct xfs_inode_log_item *iip,
+	struct xfs_inode_log_format *ilf,
+	struct xfs_log_vec	*lv,
+	struct xfs_log_iovec	**vecp)
+{
+	struct xfs_inode	*ip = iip->ili_inode;
+	size_t			data_bytes;
+
+	switch (ip->i_df.if_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		iip->ili_fields &=
+			~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT | XFS_ILOG_DEV);
+
+		if ((iip->ili_fields & XFS_ILOG_DEXT) &&
+		    ip->i_df.if_nextents > 0 &&
+		    ip->i_df.if_bytes > 0) {
+			struct xfs_bmbt_rec *p;
+
+			ASSERT(xfs_iext_count(&ip->i_df) > 0);
+
+			p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IEXT);
+			data_bytes = xfs_iextents_copy(ip, p, XFS_DATA_FORK);
+			xlog_finish_iovec(lv, *vecp, data_bytes);
+
+			ASSERT(data_bytes <= ip->i_df.if_bytes);
+
+			ilf->ilf_dsize = data_bytes;
+			ilf->ilf_size++;
+		} else {
+			iip->ili_fields &= ~XFS_ILOG_DEXT;
+		}
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		iip->ili_fields &=
+			~(XFS_ILOG_DDATA | XFS_ILOG_DEXT | XFS_ILOG_DEV);
+
+		if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
+		    ip->i_df.if_broot_bytes > 0) {
+			ASSERT(ip->i_df.if_broot != NULL);
+			xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IBROOT,
+					ip->i_df.if_broot,
+					ip->i_df.if_broot_bytes);
+			ilf->ilf_dsize = ip->i_df.if_broot_bytes;
+			ilf->ilf_size++;
+		} else {
+			ASSERT(!(iip->ili_fields &
+				 XFS_ILOG_DBROOT));
+			iip->ili_fields &= ~XFS_ILOG_DBROOT;
+		}
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+		iip->ili_fields &=
+			~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT | XFS_ILOG_DEV);
+		if ((iip->ili_fields & XFS_ILOG_DDATA) &&
+		    ip->i_df.if_bytes > 0) {
+			ASSERT(ip->i_df.if_u1.if_data != NULL);
+			ASSERT(ip->i_disk_size > 0);
+			xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_ILOCAL,
+					ip->i_df.if_u1.if_data,
+					ip->i_df.if_bytes);
+			ilf->ilf_dsize = (unsigned)ip->i_df.if_bytes;
+			ilf->ilf_size++;
+		} else {
+			iip->ili_fields &= ~XFS_ILOG_DDATA;
+		}
+		break;
+	case XFS_DINODE_FMT_DEV:
+		iip->ili_fields &=
+			~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT | XFS_ILOG_DEXT);
+		if (iip->ili_fields & XFS_ILOG_DEV)
+			ilf->ilf_u.ilfu_rdev = sysv_encode_dev(VFS_I(ip)->i_rdev);
+		break;
+	default:
+		ASSERT(0);
+		break;
+	}
+}
+
+STATIC void
+xfs_inode_item_format_attr_fork(
+	struct xfs_inode_log_item *iip,
+	struct xfs_inode_log_format *ilf,
+	struct xfs_log_vec	*lv,
+	struct xfs_log_iovec	**vecp)
+{
+	struct xfs_inode	*ip = iip->ili_inode;
+	size_t			data_bytes;
+
+	switch (ip->i_af.if_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		iip->ili_fields &=
+			~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
+
+		if ((iip->ili_fields & XFS_ILOG_AEXT) &&
+		    ip->i_af.if_nextents > 0 &&
+		    ip->i_af.if_bytes > 0) {
+			struct xfs_bmbt_rec *p;
+
+			ASSERT(xfs_iext_count(&ip->i_af) ==
+				ip->i_af.if_nextents);
+
+			p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_EXT);
+			data_bytes = xfs_iextents_copy(ip, p, XFS_ATTR_FORK);
+			xlog_finish_iovec(lv, *vecp, data_bytes);
+
+			ilf->ilf_asize = data_bytes;
+			ilf->ilf_size++;
+		} else {
+			iip->ili_fields &= ~XFS_ILOG_AEXT;
+		}
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		iip->ili_fields &=
+			~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
+
+		if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
+		    ip->i_af.if_broot_bytes > 0) {
+			ASSERT(ip->i_af.if_broot != NULL);
+
+			xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_BROOT,
+					ip->i_af.if_broot,
+					ip->i_af.if_broot_bytes);
+			ilf->ilf_asize = ip->i_af.if_broot_bytes;
+			ilf->ilf_size++;
+		} else {
+			iip->ili_fields &= ~XFS_ILOG_ABROOT;
+		}
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+		iip->ili_fields &=
+			~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
+
+		if ((iip->ili_fields & XFS_ILOG_ADATA) &&
+		    ip->i_af.if_bytes > 0) {
+			ASSERT(ip->i_af.if_u1.if_data != NULL);
+			xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_LOCAL,
+					ip->i_af.if_u1.if_data,
+					ip->i_af.if_bytes);
+			ilf->ilf_asize = (unsigned)ip->i_af.if_bytes;
+			ilf->ilf_size++;
+		} else {
+			iip->ili_fields &= ~XFS_ILOG_ADATA;
+		}
+		break;
+	default:
+		ASSERT(0);
+		break;
+	}
+}
+
+/*
+ * Convert an incore timestamp to a log timestamp.  Note that the log format
+ * specifies host endian format!
+ */
+static inline xfs_log_timestamp_t
+xfs_inode_to_log_dinode_ts(
+	struct xfs_inode		*ip,
+	const struct timespec64		tv)
+{
+	struct xfs_log_legacy_timestamp	*lits;
+	xfs_log_timestamp_t		its;
+
+	if (xfs_inode_has_bigtime(ip))
+		return xfs_inode_encode_bigtime(tv);
+
+	lits = (struct xfs_log_legacy_timestamp *)&its;
+	lits->t_sec = tv.tv_sec;
+	lits->t_nsec = tv.tv_nsec;
+
+	return its;
+}
+
+/*
+ * The legacy DMAPI fields are only present in the on-disk and in-log inodes,
+ * but not in the in-memory one.  But we are guaranteed to have an inode buffer
+ * in memory when logging an inode, so we can just copy it from the on-disk
+ * inode to the in-log inode here so that recovery of file system with these
+ * fields set to non-zero values doesn't lose them.  For all other cases we zero
+ * the fields.
+ */
+static void
+xfs_copy_dm_fields_to_log_dinode(
+	struct xfs_inode	*ip,
+	struct xfs_log_dinode	*to)
+{
+	struct xfs_dinode	*dip;
+
+	dip = xfs_buf_offset(ip->i_itemp->ili_item.li_buf,
+			     ip->i_imap.im_boffset);
+
+	if (xfs_iflags_test(ip, XFS_IPRESERVE_DM_FIELDS)) {
+		to->di_dmevmask = be32_to_cpu(dip->di_dmevmask);
+		to->di_dmstate = be16_to_cpu(dip->di_dmstate);
+	} else {
+		to->di_dmevmask = 0;
+		to->di_dmstate = 0;
+	}
+}
+
+static inline void
+xfs_inode_to_log_dinode_iext_counters(
+	struct xfs_inode	*ip,
+	struct xfs_log_dinode	*to)
+{
+	if (xfs_inode_has_large_extent_counts(ip)) {
+		to->di_big_nextents = xfs_ifork_nextents(&ip->i_df);
+		to->di_big_anextents = xfs_ifork_nextents(&ip->i_af);
+		to->di_nrext64_pad = 0;
+	} else {
+		to->di_nextents = xfs_ifork_nextents(&ip->i_df);
+		to->di_anextents = xfs_ifork_nextents(&ip->i_af);
+	}
+}
+
+static void
+xfs_inode_to_log_dinode(
+	struct xfs_inode	*ip,
+	struct xfs_log_dinode	*to,
+	xfs_lsn_t		lsn)
+{
+	struct inode		*inode = VFS_I(ip);
+
+	to->di_magic = XFS_DINODE_MAGIC;
+	to->di_format = xfs_ifork_format(&ip->i_df);
+	to->di_uid = i_uid_read(inode);
+	to->di_gid = i_gid_read(inode);
+	to->di_projid_lo = ip->i_projid & 0xffff;
+	to->di_projid_hi = ip->i_projid >> 16;
+
+	memset(to->di_pad3, 0, sizeof(to->di_pad3));
+	to->di_atime = xfs_inode_to_log_dinode_ts(ip, inode->i_atime);
+	to->di_mtime = xfs_inode_to_log_dinode_ts(ip, inode->i_mtime);
+	to->di_ctime = xfs_inode_to_log_dinode_ts(ip, inode->i_ctime);
+	to->di_nlink = inode->i_nlink;
+	to->di_gen = inode->i_generation;
+	to->di_mode = inode->i_mode;
+
+	to->di_size = ip->i_disk_size;
+	to->di_nblocks = ip->i_nblocks;
+	to->di_extsize = ip->i_extsize;
+	to->di_forkoff = ip->i_forkoff;
+	to->di_aformat = xfs_ifork_format(&ip->i_af);
+	to->di_flags = ip->i_diflags;
+
+	xfs_copy_dm_fields_to_log_dinode(ip, to);
+
+	/* log a dummy value to ensure log structure is fully initialised */
+	to->di_next_unlinked = NULLAGINO;
+
+	if (xfs_has_v3inodes(ip->i_mount)) {
+		to->di_version = 3;
+		to->di_changecount = inode_peek_iversion(inode);
+		to->di_crtime = xfs_inode_to_log_dinode_ts(ip, ip->i_crtime);
+		to->di_flags2 = ip->i_diflags2;
+		to->di_cowextsize = ip->i_cowextsize;
+		to->di_ino = ip->i_ino;
+		to->di_lsn = lsn;
+		memset(to->di_pad2, 0, sizeof(to->di_pad2));
+		uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
+		to->di_v3_pad = 0;
+	} else {
+		to->di_version = 2;
+		to->di_flushiter = ip->i_flushiter;
+		memset(to->di_v2_pad, 0, sizeof(to->di_v2_pad));
+	}
+
+	xfs_inode_to_log_dinode_iext_counters(ip, to);
+}
+
+/*
+ * Format the inode core. Current timestamp data is only in the VFS inode
+ * fields, so we need to grab them from there. Hence rather than just copying
+ * the XFS inode core structure, format the fields directly into the iovec.
+ */
+static void
+xfs_inode_item_format_core(
+	struct xfs_inode	*ip,
+	struct xfs_log_vec	*lv,
+	struct xfs_log_iovec	**vecp)
+{
+	struct xfs_log_dinode	*dic;
+
+	dic = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_ICORE);
+	xfs_inode_to_log_dinode(ip, dic, ip->i_itemp->ili_item.li_lsn);
+	xlog_finish_iovec(lv, *vecp, xfs_log_dinode_size(ip->i_mount));
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the given inode
+ * log item.  It fills the first item with an inode log format structure,
+ * the second with the on-disk inode structure, and a possible third and/or
+ * fourth with the inode data/extents/b-tree root and inode attributes
+ * data/extents/b-tree root.
+ *
+ * Note: Always use the 64 bit inode log format structure so we don't
+ * leave an uninitialised hole in the format item on 64 bit systems. Log
+ * recovery on 32 bit systems handles this just fine, so there's no reason
+ * for not using an initialising the properly padded structure all the time.
+ */
+STATIC void
+xfs_inode_item_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_vec	*lv)
+{
+	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
+	struct xfs_inode	*ip = iip->ili_inode;
+	struct xfs_log_iovec	*vecp = NULL;
+	struct xfs_inode_log_format *ilf;
+
+	ilf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_IFORMAT);
+	ilf->ilf_type = XFS_LI_INODE;
+	ilf->ilf_ino = ip->i_ino;
+	ilf->ilf_blkno = ip->i_imap.im_blkno;
+	ilf->ilf_len = ip->i_imap.im_len;
+	ilf->ilf_boffset = ip->i_imap.im_boffset;
+	ilf->ilf_fields = XFS_ILOG_CORE;
+	ilf->ilf_size = 2; /* format + core */
+
+	/*
+	 * make sure we don't leak uninitialised data into the log in the case
+	 * when we don't log every field in the inode.
+	 */
+	ilf->ilf_dsize = 0;
+	ilf->ilf_asize = 0;
+	ilf->ilf_pad = 0;
+	memset(&ilf->ilf_u, 0, sizeof(ilf->ilf_u));
+
+	xlog_finish_iovec(lv, vecp, sizeof(*ilf));
+
+	xfs_inode_item_format_core(ip, lv, &vecp);
+	xfs_inode_item_format_data_fork(iip, ilf, lv, &vecp);
+	if (xfs_inode_has_attr_fork(ip)) {
+		xfs_inode_item_format_attr_fork(iip, ilf, lv, &vecp);
+	} else {
+		iip->ili_fields &=
+			~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
+	}
+
+	/* update the format with the exact fields we actually logged */
+	ilf->ilf_fields |= (iip->ili_fields & ~XFS_ILOG_TIMESTAMP);
+}
+
+/*
+ * This is called to pin the inode associated with the inode log
+ * item in memory so it cannot be written out.
+ */
+STATIC void
+xfs_inode_item_pin(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_inode	*ip = INODE_ITEM(lip)->ili_inode;
+
+	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+	ASSERT(lip->li_buf);
+
+	trace_xfs_inode_pin(ip, _RET_IP_);
+	atomic_inc(&ip->i_pincount);
+}
+
+
+/*
+ * This is called to unpin the inode associated with the inode log
+ * item which was previously pinned with a call to xfs_inode_item_pin().
+ *
+ * Also wake up anyone in xfs_iunpin_wait() if the count goes to 0.
+ *
+ * Note that unpin can race with inode cluster buffer freeing marking the buffer
+ * stale. In that case, flush completions are run from the buffer unpin call,
+ * which may happen before the inode is unpinned. If we lose the race, there
+ * will be no buffer attached to the log item, but the inode will be marked
+ * XFS_ISTALE.
+ */
+STATIC void
+xfs_inode_item_unpin(
+	struct xfs_log_item	*lip,
+	int			remove)
+{
+	struct xfs_inode	*ip = INODE_ITEM(lip)->ili_inode;
+
+	trace_xfs_inode_unpin(ip, _RET_IP_);
+	ASSERT(lip->li_buf || xfs_iflags_test(ip, XFS_ISTALE));
+	ASSERT(atomic_read(&ip->i_pincount) > 0);
+	if (atomic_dec_and_test(&ip->i_pincount))
+		wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);
+}
+
+STATIC uint
+xfs_inode_item_push(
+	struct xfs_log_item	*lip,
+	struct list_head	*buffer_list)
+		__releases(&lip->li_ailp->ail_lock)
+		__acquires(&lip->li_ailp->ail_lock)
+{
+	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
+	struct xfs_inode	*ip = iip->ili_inode;
+	struct xfs_buf		*bp = lip->li_buf;
+	uint			rval = XFS_ITEM_SUCCESS;
+	int			error;
+
+	if (!bp || (ip->i_flags & XFS_ISTALE)) {
+		/*
+		 * Inode item/buffer is being aborted due to cluster
+		 * buffer deletion. Trigger a log force to have that operation
+		 * completed and items removed from the AIL before the next push
+		 * attempt.
+		 */
+		return XFS_ITEM_PINNED;
+	}
+
+	if (xfs_ipincount(ip) > 0 || xfs_buf_ispinned(bp))
+		return XFS_ITEM_PINNED;
+
+	if (xfs_iflags_test(ip, XFS_IFLUSHING))
+		return XFS_ITEM_FLUSHING;
+
+	if (!xfs_buf_trylock(bp))
+		return XFS_ITEM_LOCKED;
+
+	spin_unlock(&lip->li_ailp->ail_lock);
+
+	/*
+	 * We need to hold a reference for flushing the cluster buffer as it may
+	 * fail the buffer without IO submission. In which case, we better get a
+	 * reference for that completion because otherwise we don't get a
+	 * reference for IO until we queue the buffer for delwri submission.
+	 */
+	xfs_buf_hold(bp);
+	error = xfs_iflush_cluster(bp);
+	if (!error) {
+		if (!xfs_buf_delwri_queue(bp, buffer_list))
+			rval = XFS_ITEM_FLUSHING;
+		xfs_buf_relse(bp);
+	} else {
+		/*
+		 * Release the buffer if we were unable to flush anything. On
+		 * any other error, the buffer has already been released.
+		 */
+		if (error == -EAGAIN)
+			xfs_buf_relse(bp);
+		rval = XFS_ITEM_LOCKED;
+	}
+
+	spin_lock(&lip->li_ailp->ail_lock);
+	return rval;
+}
+
+/*
+ * Unlock the inode associated with the inode log item.
+ */
+STATIC void
+xfs_inode_item_release(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
+	struct xfs_inode	*ip = iip->ili_inode;
+	unsigned short		lock_flags;
+
+	ASSERT(ip->i_itemp != NULL);
+	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+	lock_flags = iip->ili_lock_flags;
+	iip->ili_lock_flags = 0;
+	if (lock_flags)
+		xfs_iunlock(ip, lock_flags);
+}
+
+/*
+ * This is called to find out where the oldest active copy of the inode log
+ * item in the on disk log resides now that the last log write of it completed
+ * at the given lsn.  Since we always re-log all dirty data in an inode, the
+ * latest copy in the on disk log is the only one that matters.  Therefore,
+ * simply return the given lsn.
+ *
+ * If the inode has been marked stale because the cluster is being freed, we
+ * don't want to (re-)insert this inode into the AIL. There is a race condition
+ * where the cluster buffer may be unpinned before the inode is inserted into
+ * the AIL during transaction committed processing. If the buffer is unpinned
+ * before the inode item has been committed and inserted, then it is possible
+ * for the buffer to be written and IO completes before the inode is inserted
+ * into the AIL. In that case, we'd be inserting a clean, stale inode into the
+ * AIL which will never get removed. It will, however, get reclaimed which
+ * triggers an assert in xfs_inode_free() complaining about freein an inode
+ * still in the AIL.
+ *
+ * To avoid this, just unpin the inode directly and return a LSN of -1 so the
+ * transaction committed code knows that it does not need to do any further
+ * processing on the item.
+ */
+STATIC xfs_lsn_t
+xfs_inode_item_committed(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
+	struct xfs_inode	*ip = iip->ili_inode;
+
+	if (xfs_iflags_test(ip, XFS_ISTALE)) {
+		xfs_inode_item_unpin(lip, 0);
+		return -1;
+	}
+	return lsn;
+}
+
+STATIC void
+xfs_inode_item_committing(
+	struct xfs_log_item	*lip,
+	xfs_csn_t		seq)
+{
+	INODE_ITEM(lip)->ili_commit_seq = seq;
+	return xfs_inode_item_release(lip);
+}
+
+static const struct xfs_item_ops xfs_inode_item_ops = {
+	.iop_size	= xfs_inode_item_size,
+	.iop_format	= xfs_inode_item_format,
+	.iop_pin	= xfs_inode_item_pin,
+	.iop_unpin	= xfs_inode_item_unpin,
+	.iop_release	= xfs_inode_item_release,
+	.iop_committed	= xfs_inode_item_committed,
+	.iop_push	= xfs_inode_item_push,
+	.iop_committing	= xfs_inode_item_committing,
+};
+
+
+/*
+ * Initialize the inode log item for a newly allocated (in-core) inode.
+ */
+void
+xfs_inode_item_init(
+	struct xfs_inode	*ip,
+	struct xfs_mount	*mp)
+{
+	struct xfs_inode_log_item *iip;
+
+	ASSERT(ip->i_itemp == NULL);
+	iip = ip->i_itemp = kmem_cache_zalloc(xfs_ili_cache,
+					      GFP_KERNEL | __GFP_NOFAIL);
+
+	iip->ili_inode = ip;
+	spin_lock_init(&iip->ili_lock);
+	xfs_log_item_init(mp, &iip->ili_item, XFS_LI_INODE,
+						&xfs_inode_item_ops);
+}
+
+/*
+ * Free the inode log item and any memory hanging off of it.
+ */
+void
+xfs_inode_item_destroy(
+	struct xfs_inode	*ip)
+{
+	struct xfs_inode_log_item *iip = ip->i_itemp;
+
+	ASSERT(iip->ili_item.li_buf == NULL);
+
+	ip->i_itemp = NULL;
+	kmem_free(iip->ili_item.li_lv_shadow);
+	kmem_cache_free(xfs_ili_cache, iip);
+}
+
+
+/*
+ * We only want to pull the item from the AIL if it is actually there
+ * and its location in the log has not changed since we started the
+ * flush.  Thus, we only bother if the inode's lsn has not changed.
+ */
+static void
+xfs_iflush_ail_updates(
+	struct xfs_ail		*ailp,
+	struct list_head	*list)
+{
+	struct xfs_log_item	*lip;
+	xfs_lsn_t		tail_lsn = 0;
+
+	/* this is an opencoded batch version of xfs_trans_ail_delete */
+	spin_lock(&ailp->ail_lock);
+	list_for_each_entry(lip, list, li_bio_list) {
+		xfs_lsn_t	lsn;
+
+		clear_bit(XFS_LI_FAILED, &lip->li_flags);
+		if (INODE_ITEM(lip)->ili_flush_lsn != lip->li_lsn)
+			continue;
+
+		/*
+		 * dgc: Not sure how this happens, but it happens very
+		 * occassionaly via generic/388.  xfs_iflush_abort() also
+		 * silently handles this same "under writeback but not in AIL at
+		 * shutdown" condition via xfs_trans_ail_delete().
+		 */
+		if (!test_bit(XFS_LI_IN_AIL, &lip->li_flags)) {
+			ASSERT(xlog_is_shutdown(lip->li_log));
+			continue;
+		}
+
+		lsn = xfs_ail_delete_one(ailp, lip);
+		if (!tail_lsn && lsn)
+			tail_lsn = lsn;
+	}
+	xfs_ail_update_finish(ailp, tail_lsn);
+}
+
+/*
+ * Walk the list of inodes that have completed their IOs. If they are clean
+ * remove them from the list and dissociate them from the buffer. Buffers that
+ * are still dirty remain linked to the buffer and on the list. Caller must
+ * handle them appropriately.
+ */
+static void
+xfs_iflush_finish(
+	struct xfs_buf		*bp,
+	struct list_head	*list)
+{
+	struct xfs_log_item	*lip, *n;
+
+	list_for_each_entry_safe(lip, n, list, li_bio_list) {
+		struct xfs_inode_log_item *iip = INODE_ITEM(lip);
+		bool	drop_buffer = false;
+
+		spin_lock(&iip->ili_lock);
+
+		/*
+		 * Remove the reference to the cluster buffer if the inode is
+		 * clean in memory and drop the buffer reference once we've
+		 * dropped the locks we hold.
+		 */
+		ASSERT(iip->ili_item.li_buf == bp);
+		if (!iip->ili_fields) {
+			iip->ili_item.li_buf = NULL;
+			list_del_init(&lip->li_bio_list);
+			drop_buffer = true;
+		}
+		iip->ili_last_fields = 0;
+		iip->ili_flush_lsn = 0;
+		spin_unlock(&iip->ili_lock);
+		xfs_iflags_clear(iip->ili_inode, XFS_IFLUSHING);
+		if (drop_buffer)
+			xfs_buf_rele(bp);
+	}
+}
+
+/*
+ * Inode buffer IO completion routine.  It is responsible for removing inodes
+ * attached to the buffer from the AIL if they have not been re-logged and
+ * completing the inode flush.
+ */
+void
+xfs_buf_inode_iodone(
+	struct xfs_buf		*bp)
+{
+	struct xfs_log_item	*lip, *n;
+	LIST_HEAD(flushed_inodes);
+	LIST_HEAD(ail_updates);
+
+	/*
+	 * Pull the attached inodes from the buffer one at a time and take the
+	 * appropriate action on them.
+	 */
+	list_for_each_entry_safe(lip, n, &bp->b_li_list, li_bio_list) {
+		struct xfs_inode_log_item *iip = INODE_ITEM(lip);
+
+		if (xfs_iflags_test(iip->ili_inode, XFS_ISTALE)) {
+			xfs_iflush_abort(iip->ili_inode);
+			continue;
+		}
+		if (!iip->ili_last_fields)
+			continue;
+
+		/* Do an unlocked check for needing the AIL lock. */
+		if (iip->ili_flush_lsn == lip->li_lsn ||
+		    test_bit(XFS_LI_FAILED, &lip->li_flags))
+			list_move_tail(&lip->li_bio_list, &ail_updates);
+		else
+			list_move_tail(&lip->li_bio_list, &flushed_inodes);
+	}
+
+	if (!list_empty(&ail_updates)) {
+		xfs_iflush_ail_updates(bp->b_mount->m_ail, &ail_updates);
+		list_splice_tail(&ail_updates, &flushed_inodes);
+	}
+
+	xfs_iflush_finish(bp, &flushed_inodes);
+	if (!list_empty(&flushed_inodes))
+		list_splice_tail(&flushed_inodes, &bp->b_li_list);
+}
+
+void
+xfs_buf_inode_io_fail(
+	struct xfs_buf		*bp)
+{
+	struct xfs_log_item	*lip;
+
+	list_for_each_entry(lip, &bp->b_li_list, li_bio_list)
+		set_bit(XFS_LI_FAILED, &lip->li_flags);
+}
+
+/*
+ * Clear the inode logging fields so no more flushes are attempted.  If we are
+ * on a buffer list, it is now safe to remove it because the buffer is
+ * guaranteed to be locked. The caller will drop the reference to the buffer
+ * the log item held.
+ */
+static void
+xfs_iflush_abort_clean(
+	struct xfs_inode_log_item *iip)
+{
+	iip->ili_last_fields = 0;
+	iip->ili_fields = 0;
+	iip->ili_fsync_fields = 0;
+	iip->ili_flush_lsn = 0;
+	iip->ili_item.li_buf = NULL;
+	list_del_init(&iip->ili_item.li_bio_list);
+}
+
+/*
+ * Abort flushing the inode from a context holding the cluster buffer locked.
+ *
+ * This is the normal runtime method of aborting writeback of an inode that is
+ * attached to a cluster buffer. It occurs when the inode and the backing
+ * cluster buffer have been freed (i.e. inode is XFS_ISTALE), or when cluster
+ * flushing or buffer IO completion encounters a log shutdown situation.
+ *
+ * If we need to abort inode writeback and we don't already hold the buffer
+ * locked, call xfs_iflush_shutdown_abort() instead as this should only ever be
+ * necessary in a shutdown situation.
+ */
+void
+xfs_iflush_abort(
+	struct xfs_inode	*ip)
+{
+	struct xfs_inode_log_item *iip = ip->i_itemp;
+	struct xfs_buf		*bp;
+
+	if (!iip) {
+		/* clean inode, nothing to do */
+		xfs_iflags_clear(ip, XFS_IFLUSHING);
+		return;
+	}
+
+	/*
+	 * Remove the inode item from the AIL before we clear its internal
+	 * state. Whilst the inode is in the AIL, it should have a valid buffer
+	 * pointer for push operations to access - it is only safe to remove the
+	 * inode from the buffer once it has been removed from the AIL.
+	 *
+	 * We also clear the failed bit before removing the item from the AIL
+	 * as xfs_trans_ail_delete()->xfs_clear_li_failed() will release buffer
+	 * references the inode item owns and needs to hold until we've fully
+	 * aborted the inode log item and detached it from the buffer.
+	 */
+	clear_bit(XFS_LI_FAILED, &iip->ili_item.li_flags);
+	xfs_trans_ail_delete(&iip->ili_item, 0);
+
+	/*
+	 * Grab the inode buffer so can we release the reference the inode log
+	 * item holds on it.
+	 */
+	spin_lock(&iip->ili_lock);
+	bp = iip->ili_item.li_buf;
+	xfs_iflush_abort_clean(iip);
+	spin_unlock(&iip->ili_lock);
+
+	xfs_iflags_clear(ip, XFS_IFLUSHING);
+	if (bp)
+		xfs_buf_rele(bp);
+}
+
+/*
+ * Abort an inode flush in the case of a shutdown filesystem. This can be called
+ * from anywhere with just an inode reference and does not require holding the
+ * inode cluster buffer locked. If the inode is attached to a cluster buffer,
+ * it will grab and lock it safely, then abort the inode flush.
+ */
+void
+xfs_iflush_shutdown_abort(
+	struct xfs_inode	*ip)
+{
+	struct xfs_inode_log_item *iip = ip->i_itemp;
+	struct xfs_buf		*bp;
+
+	if (!iip) {
+		/* clean inode, nothing to do */
+		xfs_iflags_clear(ip, XFS_IFLUSHING);
+		return;
+	}
+
+	spin_lock(&iip->ili_lock);
+	bp = iip->ili_item.li_buf;
+	if (!bp) {
+		spin_unlock(&iip->ili_lock);
+		xfs_iflush_abort(ip);
+		return;
+	}
+
+	/*
+	 * We have to take a reference to the buffer so that it doesn't get
+	 * freed when we drop the ili_lock and then wait to lock the buffer.
+	 * We'll clean up the extra reference after we pick up the ili_lock
+	 * again.
+	 */
+	xfs_buf_hold(bp);
+	spin_unlock(&iip->ili_lock);
+	xfs_buf_lock(bp);
+
+	spin_lock(&iip->ili_lock);
+	if (!iip->ili_item.li_buf) {
+		/*
+		 * Raced with another removal, hold the only reference
+		 * to bp now. Inode should not be in the AIL now, so just clean
+		 * up and return;
+		 */
+		ASSERT(list_empty(&iip->ili_item.li_bio_list));
+		ASSERT(!test_bit(XFS_LI_IN_AIL, &iip->ili_item.li_flags));
+		xfs_iflush_abort_clean(iip);
+		spin_unlock(&iip->ili_lock);
+		xfs_iflags_clear(ip, XFS_IFLUSHING);
+		xfs_buf_relse(bp);
+		return;
+	}
+
+	/*
+	 * Got two references to bp. The first will get dropped by
+	 * xfs_iflush_abort() when the item is removed from the buffer list, but
+	 * we can't drop our reference until _abort() returns because we have to
+	 * unlock the buffer as well. Hence we abort and then unlock and release
+	 * our reference to the buffer.
+	 */
+	ASSERT(iip->ili_item.li_buf == bp);
+	spin_unlock(&iip->ili_lock);
+	xfs_iflush_abort(ip);
+	xfs_buf_relse(bp);
+}
+
+
+/*
+ * convert an xfs_inode_log_format struct from the old 32 bit version
+ * (which can have different field alignments) to the native 64 bit version
+ */
+int
+xfs_inode_item_format_convert(
+	struct xfs_log_iovec		*buf,
+	struct xfs_inode_log_format	*in_f)
+{
+	struct xfs_inode_log_format_32	*in_f32 = buf->i_addr;
+
+	if (buf->i_len != sizeof(*in_f32)) {
+		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, NULL);
+		return -EFSCORRUPTED;
+	}
+
+	in_f->ilf_type = in_f32->ilf_type;
+	in_f->ilf_size = in_f32->ilf_size;
+	in_f->ilf_fields = in_f32->ilf_fields;
+	in_f->ilf_asize = in_f32->ilf_asize;
+	in_f->ilf_dsize = in_f32->ilf_dsize;
+	in_f->ilf_ino = in_f32->ilf_ino;
+	memcpy(&in_f->ilf_u, &in_f32->ilf_u, sizeof(in_f->ilf_u));
+	in_f->ilf_blkno = in_f32->ilf_blkno;
+	in_f->ilf_len = in_f32->ilf_len;
+	in_f->ilf_boffset = in_f32->ilf_boffset;
+	return 0;
+}