--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020-2022, Red Hat, 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_trans_priv.h"
+#include "xfs_ag.h"
+#include "xfs_iunlink_item.h"
+#include "xfs_trace.h"
+#include "xfs_error.h"
+
+struct kmem_cache *xfs_iunlink_cache;
+
+static inline struct xfs_iunlink_item *IUL_ITEM(struct xfs_log_item *lip)
+{
+ return container_of(lip, struct xfs_iunlink_item, item);
+}
+
+static void
+xfs_iunlink_item_release(
+ struct xfs_log_item *lip)
+{
+ struct xfs_iunlink_item *iup = IUL_ITEM(lip);
+
+ xfs_perag_put(iup->pag);
+ kmem_cache_free(xfs_iunlink_cache, IUL_ITEM(lip));
+}
+
+
+static uint64_t
+xfs_iunlink_item_sort(
+ struct xfs_log_item *lip)
+{
+ return IUL_ITEM(lip)->ip->i_ino;
+}
+
+/*
+ * Look up the inode cluster buffer and log the on-disk unlinked inode change
+ * we need to make.
+ */
+static int
+xfs_iunlink_log_dinode(
+ struct xfs_trans *tp,
+ struct xfs_iunlink_item *iup)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ struct xfs_inode *ip = iup->ip;
+ struct xfs_dinode *dip;
+ struct xfs_buf *ibp;
+ int offset;
+ int error;
+
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &ibp);
+ if (error)
+ return error;
+ /*
+ * Don't log the unlinked field on stale buffers as this may be the
+ * transaction that frees the inode cluster and relogging the buffer
+ * here will incorrectly remove the stale state.
+ */
+ if (ibp->b_flags & XBF_STALE)
+ goto out;
+
+ dip = xfs_buf_offset(ibp, ip->i_imap.im_boffset);
+
+ /* Make sure the old pointer isn't garbage. */
+ if (be32_to_cpu(dip->di_next_unlinked) != iup->old_agino) {
+ xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip,
+ sizeof(*dip), __this_address);
+ error = -EFSCORRUPTED;
+ goto out;
+ }
+
+ trace_xfs_iunlink_update_dinode(mp, iup->pag->pag_agno,
+ XFS_INO_TO_AGINO(mp, ip->i_ino),
+ be32_to_cpu(dip->di_next_unlinked), iup->next_agino);
+
+ dip->di_next_unlinked = cpu_to_be32(iup->next_agino);
+ offset = ip->i_imap.im_boffset +
+ offsetof(struct xfs_dinode, di_next_unlinked);
+
+ xfs_dinode_calc_crc(mp, dip);
+ xfs_trans_inode_buf(tp, ibp);
+ xfs_trans_log_buf(tp, ibp, offset, offset + sizeof(xfs_agino_t) - 1);
+ return 0;
+out:
+ xfs_trans_brelse(tp, ibp);
+ return error;
+}
+
+/*
+ * On precommit, we grab the inode cluster buffer for the inode number we were
+ * passed, then update the next unlinked field for that inode in the buffer and
+ * log the buffer. This ensures that the inode cluster buffer was logged in the
+ * correct order w.r.t. other inode cluster buffers. We can then remove the
+ * iunlink item from the transaction and release it as it is has now served it's
+ * purpose.
+ */
+static int
+xfs_iunlink_item_precommit(
+ struct xfs_trans *tp,
+ struct xfs_log_item *lip)
+{
+ struct xfs_iunlink_item *iup = IUL_ITEM(lip);
+ int error;
+
+ error = xfs_iunlink_log_dinode(tp, iup);
+ list_del(&lip->li_trans);
+ xfs_iunlink_item_release(lip);
+ return error;
+}
+
+static const struct xfs_item_ops xfs_iunlink_item_ops = {
+ .iop_release = xfs_iunlink_item_release,
+ .iop_sort = xfs_iunlink_item_sort,
+ .iop_precommit = xfs_iunlink_item_precommit,
+};
+
+
+/*
+ * Initialize the inode log item for a newly allocated (in-core) inode.
+ *
+ * Inode extents can only reside within an AG. Hence specify the starting
+ * block for the inode chunk by offset within an AG as well as the
+ * length of the allocated extent.
+ *
+ * This joins the item to the transaction and marks it dirty so
+ * that we don't need a separate call to do this, nor does the
+ * caller need to know anything about the iunlink item.
+ */
+int
+xfs_iunlink_log_inode(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ struct xfs_perag *pag,
+ xfs_agino_t next_agino)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ struct xfs_iunlink_item *iup;
+
+ ASSERT(xfs_verify_agino_or_null(pag, next_agino));
+ ASSERT(xfs_verify_agino_or_null(pag, ip->i_next_unlinked));
+
+ /*
+ * Since we're updating a linked list, we should never find that the
+ * current pointer is the same as the new value, unless we're
+ * terminating the list.
+ */
+ if (ip->i_next_unlinked == next_agino) {
+ if (next_agino != NULLAGINO)
+ return -EFSCORRUPTED;
+ return 0;
+ }
+
+ iup = kmem_cache_zalloc(xfs_iunlink_cache, GFP_KERNEL | __GFP_NOFAIL);
+ xfs_log_item_init(mp, &iup->item, XFS_LI_IUNLINK,
+ &xfs_iunlink_item_ops);
+
+ iup->ip = ip;
+ iup->next_agino = next_agino;
+ iup->old_agino = ip->i_next_unlinked;
+
+ atomic_inc(&pag->pag_ref);
+ iup->pag = pag;
+
+ xfs_trans_add_item(tp, &iup->item);
+ tp->t_flags |= XFS_TRANS_DIRTY;
+ set_bit(XFS_LI_DIRTY, &iup->item.li_flags);
+ return 0;
+}
+
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