1 files changed, 262 insertions, 0 deletions
diff --git a/fs/xfs/xfs_icreate_item.c b/fs/xfs/xfs_icreate_item.c
new file mode 100644
index 000000000..b05314d48
--- /dev/null
+++ b/fs/xfs/xfs_icreate_item.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2008-2010, 2013 Dave Chinner
+ * 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_icreate_item.h"
+#include "xfs_log.h"
+#include "xfs_log_priv.h"
+#include "xfs_log_recover.h"
+#include "xfs_ialloc.h"
+#include "xfs_trace.h"
+
+struct kmem_cache	*xfs_icreate_cache;		/* inode create item */
+
+static inline struct xfs_icreate_item *ICR_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_icreate_item, ic_item);
+}
+
+/*
+ * This returns the number of iovecs needed to log the given inode item.
+ *
+ * We only need one iovec for the icreate log structure.
+ */
+STATIC void
+xfs_icreate_item_size(
+	struct xfs_log_item	*lip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	*nvecs += 1;
+	*nbytes += sizeof(struct xfs_icreate_log);
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given inode create log item.
+ */
+STATIC void
+xfs_icreate_item_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_vec	*lv)
+{
+	struct xfs_icreate_item	*icp = ICR_ITEM(lip);
+	struct xfs_log_iovec	*vecp = NULL;
+
+	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ICREATE,
+			&icp->ic_format,
+			sizeof(struct xfs_icreate_log));
+}
+
+STATIC void
+xfs_icreate_item_release(
+	struct xfs_log_item	*lip)
+{
+	kmem_free(ICR_ITEM(lip)->ic_item.li_lv_shadow);
+	kmem_cache_free(xfs_icreate_cache, ICR_ITEM(lip));
+}
+
+static const struct xfs_item_ops xfs_icreate_item_ops = {
+	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED,
+	.iop_size	= xfs_icreate_item_size,
+	.iop_format	= xfs_icreate_item_format,
+	.iop_release	= xfs_icreate_item_release,
+};
+
+
+/*
+ * 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 icreate item.
+ */
+void
+xfs_icreate_log(
+	struct xfs_trans	*tp,
+	xfs_agnumber_t		agno,
+	xfs_agblock_t		agbno,
+	unsigned int		count,
+	unsigned int		inode_size,
+	xfs_agblock_t		length,
+	unsigned int		generation)
+{
+	struct xfs_icreate_item	*icp;
+
+	icp = kmem_cache_zalloc(xfs_icreate_cache, GFP_KERNEL | __GFP_NOFAIL);
+
+	xfs_log_item_init(tp->t_mountp, &icp->ic_item, XFS_LI_ICREATE,
+			  &xfs_icreate_item_ops);
+
+	icp->ic_format.icl_type = XFS_LI_ICREATE;
+	icp->ic_format.icl_size = 1;	/* single vector */
+	icp->ic_format.icl_ag = cpu_to_be32(agno);
+	icp->ic_format.icl_agbno = cpu_to_be32(agbno);
+	icp->ic_format.icl_count = cpu_to_be32(count);
+	icp->ic_format.icl_isize = cpu_to_be32(inode_size);
+	icp->ic_format.icl_length = cpu_to_be32(length);
+	icp->ic_format.icl_gen = cpu_to_be32(generation);
+
+	xfs_trans_add_item(tp, &icp->ic_item);
+	tp->t_flags |= XFS_TRANS_DIRTY;
+	set_bit(XFS_LI_DIRTY, &icp->ic_item.li_flags);
+}
+
+static enum xlog_recover_reorder
+xlog_recover_icreate_reorder(
+		struct xlog_recover_item *item)
+{
+	/*
+	 * Inode allocation buffers must be replayed before subsequent inode
+	 * items try to modify those buffers.  ICREATE items are the logical
+	 * equivalent of logging a newly initialized inode buffer, so recover
+	 * these at the same time that we recover logged buffers.
+	 */
+	return XLOG_REORDER_BUFFER_LIST;
+}
+
+/*
+ * This routine is called when an inode create format structure is found in a
+ * committed transaction in the log.  It's purpose is to initialise the inodes
+ * being allocated on disk. This requires us to get inode cluster buffers that
+ * match the range to be initialised, stamped with inode templates and written
+ * by delayed write so that subsequent modifications will hit the cached buffer
+ * and only need writing out at the end of recovery.
+ */
+STATIC int
+xlog_recover_icreate_commit_pass2(
+	struct xlog			*log,
+	struct list_head		*buffer_list,
+	struct xlog_recover_item	*item,
+	xfs_lsn_t			lsn)
+{
+	struct xfs_mount		*mp = log->l_mp;
+	struct xfs_icreate_log		*icl;
+	struct xfs_ino_geometry		*igeo = M_IGEO(mp);
+	xfs_agnumber_t			agno;
+	xfs_agblock_t			agbno;
+	unsigned int			count;
+	unsigned int			isize;
+	xfs_agblock_t			length;
+	int				bb_per_cluster;
+	int				cancel_count;
+	int				nbufs;
+	int				i;
+
+	icl = (struct xfs_icreate_log *)item->ri_buf[0].i_addr;
+	if (icl->icl_type != XFS_LI_ICREATE) {
+		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad type");
+		return -EINVAL;
+	}
+
+	if (icl->icl_size != 1) {
+		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad icl size");
+		return -EINVAL;
+	}
+
+	agno = be32_to_cpu(icl->icl_ag);
+	if (agno >= mp->m_sb.sb_agcount) {
+		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad agno");
+		return -EINVAL;
+	}
+	agbno = be32_to_cpu(icl->icl_agbno);
+	if (!agbno || agbno == NULLAGBLOCK || agbno >= mp->m_sb.sb_agblocks) {
+		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad agbno");
+		return -EINVAL;
+	}
+	isize = be32_to_cpu(icl->icl_isize);
+	if (isize != mp->m_sb.sb_inodesize) {
+		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad isize");
+		return -EINVAL;
+	}
+	count = be32_to_cpu(icl->icl_count);
+	if (!count) {
+		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad count");
+		return -EINVAL;
+	}
+	length = be32_to_cpu(icl->icl_length);
+	if (!length || length >= mp->m_sb.sb_agblocks) {
+		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad length");
+		return -EINVAL;
+	}
+
+	/*
+	 * The inode chunk is either full or sparse and we only support
+	 * m_ino_geo.ialloc_min_blks sized sparse allocations at this time.
+	 */
+	if (length != igeo->ialloc_blks &&
+	    length != igeo->ialloc_min_blks) {
+		xfs_warn(log->l_mp,
+			 "%s: unsupported chunk length", __func__);
+		return -EINVAL;
+	}
+
+	/* verify inode count is consistent with extent length */
+	if ((count >> mp->m_sb.sb_inopblog) != length) {
+		xfs_warn(log->l_mp,
+			 "%s: inconsistent inode count and chunk length",
+			 __func__);
+		return -EINVAL;
+	}
+
+	/*
+	 * The icreate transaction can cover multiple cluster buffers and these
+	 * buffers could have been freed and reused. Check the individual
+	 * buffers for cancellation so we don't overwrite anything written after
+	 * a cancellation.
+	 */
+	bb_per_cluster = XFS_FSB_TO_BB(mp, igeo->blocks_per_cluster);
+	nbufs = length / igeo->blocks_per_cluster;
+	for (i = 0, cancel_count = 0; i < nbufs; i++) {
+		xfs_daddr_t	daddr;
+
+		daddr = XFS_AGB_TO_DADDR(mp, agno,
+				agbno + i * igeo->blocks_per_cluster);
+		if (xlog_is_buffer_cancelled(log, daddr, bb_per_cluster))
+			cancel_count++;
+	}
+
+	/*
+	 * We currently only use icreate for a single allocation at a time. This
+	 * means we should expect either all or none of the buffers to be
+	 * cancelled. Be conservative and skip replay if at least one buffer is
+	 * cancelled, but warn the user that something is awry if the buffers
+	 * are not consistent.
+	 *
+	 * XXX: This must be refined to only skip cancelled clusters once we use
+	 * icreate for multiple chunk allocations.
+	 */
+	ASSERT(!cancel_count || cancel_count == nbufs);
+	if (cancel_count) {
+		if (cancel_count != nbufs)
+			xfs_warn(mp,
+	"WARNING: partial inode chunk cancellation, skipped icreate.");
+		trace_xfs_log_recover_icreate_cancel(log, icl);
+		return 0;
+	}
+
+	trace_xfs_log_recover_icreate_recover(log, icl);
+	return xfs_ialloc_inode_init(mp, NULL, buffer_list, count, agno, agbno,
+				     length, be32_to_cpu(icl->icl_gen));
+}
+
+const struct xlog_recover_item_ops xlog_icreate_item_ops = {
+	.item_type		= XFS_LI_ICREATE,
+	.reorder		= xlog_recover_icreate_reorder,
+	.commit_pass2		= xlog_recover_icreate_commit_pass2,
+};