1 files changed, 536 insertions, 0 deletions
diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c
new file mode 100644
index 000000000000..2500f28689d5
--- /dev/null
+++ b/fs/xfs/xfs_rmap_item.c
@@ -0,0 +1,536 @@
+/*
+ * Copyright (C) 2016 Oracle.  All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * 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; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_bit.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_trans.h"
+#include "xfs_trans_priv.h"
+#include "xfs_buf_item.h"
+#include "xfs_rmap_item.h"
+#include "xfs_log.h"
+#include "xfs_rmap.h"
+
+
+kmem_zone_t	*xfs_rui_zone;
+kmem_zone_t	*xfs_rud_zone;
+
+static inline struct xfs_rui_log_item *RUI_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_rui_log_item, rui_item);
+}
+
+void
+xfs_rui_item_free(
+	struct xfs_rui_log_item	*ruip)
+{
+	if (ruip->rui_format.rui_nextents > XFS_RUI_MAX_FAST_EXTENTS)
+		kmem_free(ruip);
+	else
+		kmem_zone_free(xfs_rui_zone, ruip);
+}
+
+/*
+ * This returns the number of iovecs needed to log the given rui item.
+ * We only need 1 iovec for an rui item.  It just logs the rui_log_format
+ * structure.
+ */
+static inline int
+xfs_rui_item_sizeof(
+	struct xfs_rui_log_item *ruip)
+{
+	return sizeof(struct xfs_rui_log_format) +
+			(ruip->rui_format.rui_nextents - 1) *
+			sizeof(struct xfs_map_extent);
+}
+
+STATIC void
+xfs_rui_item_size(
+	struct xfs_log_item	*lip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	*nvecs += 1;
+	*nbytes += xfs_rui_item_sizeof(RUI_ITEM(lip));
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given rui log item. We use only 1 iovec, and we point that
+ * at the rui_log_format structure embedded in the rui item.
+ * It is at this point that we assert that all of the extent
+ * slots in the rui item have been filled.
+ */
+STATIC void
+xfs_rui_item_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_vec	*lv)
+{
+	struct xfs_rui_log_item	*ruip = RUI_ITEM(lip);
+	struct xfs_log_iovec	*vecp = NULL;
+
+	ASSERT(atomic_read(&ruip->rui_next_extent) ==
+			ruip->rui_format.rui_nextents);
+
+	ruip->rui_format.rui_type = XFS_LI_RUI;
+	ruip->rui_format.rui_size = 1;
+
+	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUI_FORMAT, &ruip->rui_format,
+			xfs_rui_item_sizeof(ruip));
+}
+
+/*
+ * Pinning has no meaning for an rui item, so just return.
+ */
+STATIC void
+xfs_rui_item_pin(
+	struct xfs_log_item	*lip)
+{
+}
+
+/*
+ * The unpin operation is the last place an RUI is manipulated in the log. It is
+ * either inserted in the AIL or aborted in the event of a log I/O error. In
+ * either case, the RUI transaction has been successfully committed to make it
+ * this far. Therefore, we expect whoever committed the RUI to either construct
+ * and commit the RUD or drop the RUD's reference in the event of error. Simply
+ * drop the log's RUI reference now that the log is done with it.
+ */
+STATIC void
+xfs_rui_item_unpin(
+	struct xfs_log_item	*lip,
+	int			remove)
+{
+	struct xfs_rui_log_item	*ruip = RUI_ITEM(lip);
+
+	xfs_rui_release(ruip);
+}
+
+/*
+ * RUI items have no locking or pushing.  However, since RUIs are pulled from
+ * the AIL when their corresponding RUDs are committed to disk, their situation
+ * is very similar to being pinned.  Return XFS_ITEM_PINNED so that the caller
+ * will eventually flush the log.  This should help in getting the RUI out of
+ * the AIL.
+ */
+STATIC uint
+xfs_rui_item_push(
+	struct xfs_log_item	*lip,
+	struct list_head	*buffer_list)
+{
+	return XFS_ITEM_PINNED;
+}
+
+/*
+ * The RUI has been either committed or aborted if the transaction has been
+ * cancelled. If the transaction was cancelled, an RUD isn't going to be
+ * constructed and thus we free the RUI here directly.
+ */
+STATIC void
+xfs_rui_item_unlock(
+	struct xfs_log_item	*lip)
+{
+	if (lip->li_flags & XFS_LI_ABORTED)
+		xfs_rui_item_free(RUI_ITEM(lip));
+}
+
+/*
+ * The RUI is logged only once and cannot be moved in the log, so simply return
+ * the lsn at which it's been logged.
+ */
+STATIC xfs_lsn_t
+xfs_rui_item_committed(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+	return lsn;
+}
+
+/*
+ * The RUI dependency tracking op doesn't do squat.  It can't because
+ * it doesn't know where the free extent is coming from.  The dependency
+ * tracking has to be handled by the "enclosing" metadata object.  For
+ * example, for inodes, the inode is locked throughout the extent freeing
+ * so the dependency should be recorded there.
+ */
+STATIC void
+xfs_rui_item_committing(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+}
+
+/*
+ * This is the ops vector shared by all rui log items.
+ */
+static const struct xfs_item_ops xfs_rui_item_ops = {
+	.iop_size	= xfs_rui_item_size,
+	.iop_format	= xfs_rui_item_format,
+	.iop_pin	= xfs_rui_item_pin,
+	.iop_unpin	= xfs_rui_item_unpin,
+	.iop_unlock	= xfs_rui_item_unlock,
+	.iop_committed	= xfs_rui_item_committed,
+	.iop_push	= xfs_rui_item_push,
+	.iop_committing = xfs_rui_item_committing,
+};
+
+/*
+ * Allocate and initialize an rui item with the given number of extents.
+ */
+struct xfs_rui_log_item *
+xfs_rui_init(
+	struct xfs_mount		*mp,
+	uint				nextents)
+
+{
+	struct xfs_rui_log_item		*ruip;
+	uint				size;
+
+	ASSERT(nextents > 0);
+	if (nextents > XFS_RUI_MAX_FAST_EXTENTS) {
+		size = (uint)(sizeof(struct xfs_rui_log_item) +
+			((nextents - 1) * sizeof(struct xfs_map_extent)));
+		ruip = kmem_zalloc(size, KM_SLEEP);
+	} else {
+		ruip = kmem_zone_zalloc(xfs_rui_zone, KM_SLEEP);
+	}
+
+	xfs_log_item_init(mp, &ruip->rui_item, XFS_LI_RUI, &xfs_rui_item_ops);
+	ruip->rui_format.rui_nextents = nextents;
+	ruip->rui_format.rui_id = (uintptr_t)(void *)ruip;
+	atomic_set(&ruip->rui_next_extent, 0);
+	atomic_set(&ruip->rui_refcount, 2);
+
+	return ruip;
+}
+
+/*
+ * Copy an RUI format buffer from the given buf, and into the destination
+ * RUI format structure.  The RUI/RUD items were designed not to need any
+ * special alignment handling.
+ */
+int
+xfs_rui_copy_format(
+	struct xfs_log_iovec		*buf,
+	struct xfs_rui_log_format	*dst_rui_fmt)
+{
+	struct xfs_rui_log_format	*src_rui_fmt;
+	uint				len;
+
+	src_rui_fmt = buf->i_addr;
+	len = sizeof(struct xfs_rui_log_format) +
+			(src_rui_fmt->rui_nextents - 1) *
+			sizeof(struct xfs_map_extent);
+
+	if (buf->i_len != len)
+		return -EFSCORRUPTED;
+
+	memcpy((char *)dst_rui_fmt, (char *)src_rui_fmt, len);
+	return 0;
+}
+
+/*
+ * Freeing the RUI requires that we remove it from the AIL if it has already
+ * been placed there. However, the RUI may not yet have been placed in the AIL
+ * when called by xfs_rui_release() from RUD processing due to the ordering of
+ * committed vs unpin operations in bulk insert operations. Hence the reference
+ * count to ensure only the last caller frees the RUI.
+ */
+void
+xfs_rui_release(
+	struct xfs_rui_log_item	*ruip)
+{
+	if (atomic_dec_and_test(&ruip->rui_refcount)) {
+		xfs_trans_ail_remove(&ruip->rui_item, SHUTDOWN_LOG_IO_ERROR);
+		xfs_rui_item_free(ruip);
+	}
+}
+
+static inline struct xfs_rud_log_item *RUD_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_rud_log_item, rud_item);
+}
+
+STATIC void
+xfs_rud_item_size(
+	struct xfs_log_item	*lip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	*nvecs += 1;
+	*nbytes += sizeof(struct xfs_rud_log_format);
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given rud log item. We use only 1 iovec, and we point that
+ * at the rud_log_format structure embedded in the rud item.
+ * It is at this point that we assert that all of the extent
+ * slots in the rud item have been filled.
+ */
+STATIC void
+xfs_rud_item_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_vec	*lv)
+{
+	struct xfs_rud_log_item	*rudp = RUD_ITEM(lip);
+	struct xfs_log_iovec	*vecp = NULL;
+
+	rudp->rud_format.rud_type = XFS_LI_RUD;
+	rudp->rud_format.rud_size = 1;
+
+	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUD_FORMAT, &rudp->rud_format,
+			sizeof(struct xfs_rud_log_format));
+}
+
+/*
+ * Pinning has no meaning for an rud item, so just return.
+ */
+STATIC void
+xfs_rud_item_pin(
+	struct xfs_log_item	*lip)
+{
+}
+
+/*
+ * Since pinning has no meaning for an rud item, unpinning does
+ * not either.
+ */
+STATIC void
+xfs_rud_item_unpin(
+	struct xfs_log_item	*lip,
+	int			remove)
+{
+}
+
+/*
+ * There isn't much you can do to push on an rud item.  It is simply stuck
+ * waiting for the log to be flushed to disk.
+ */
+STATIC uint
+xfs_rud_item_push(
+	struct xfs_log_item	*lip,
+	struct list_head	*buffer_list)
+{
+	return XFS_ITEM_PINNED;
+}
+
+/*
+ * The RUD is either committed or aborted if the transaction is cancelled. If
+ * the transaction is cancelled, drop our reference to the RUI and free the
+ * RUD.
+ */
+STATIC void
+xfs_rud_item_unlock(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_rud_log_item	*rudp = RUD_ITEM(lip);
+
+	if (lip->li_flags & XFS_LI_ABORTED) {
+		xfs_rui_release(rudp->rud_ruip);
+		kmem_zone_free(xfs_rud_zone, rudp);
+	}
+}
+
+/*
+ * When the rud item is committed to disk, all we need to do is delete our
+ * reference to our partner rui item and then free ourselves. Since we're
+ * freeing ourselves we must return -1 to keep the transaction code from
+ * further referencing this item.
+ */
+STATIC xfs_lsn_t
+xfs_rud_item_committed(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+	struct xfs_rud_log_item	*rudp = RUD_ITEM(lip);
+
+	/*
+	 * Drop the RUI reference regardless of whether the RUD has been
+	 * aborted. Once the RUD transaction is constructed, it is the sole
+	 * responsibility of the RUD to release the RUI (even if the RUI is
+	 * aborted due to log I/O error).
+	 */
+	xfs_rui_release(rudp->rud_ruip);
+	kmem_zone_free(xfs_rud_zone, rudp);
+
+	return (xfs_lsn_t)-1;
+}
+
+/*
+ * The RUD dependency tracking op doesn't do squat.  It can't because
+ * it doesn't know where the free extent is coming from.  The dependency
+ * tracking has to be handled by the "enclosing" metadata object.  For
+ * example, for inodes, the inode is locked throughout the extent freeing
+ * so the dependency should be recorded there.
+ */
+STATIC void
+xfs_rud_item_committing(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+}
+
+/*
+ * This is the ops vector shared by all rud log items.
+ */
+static const struct xfs_item_ops xfs_rud_item_ops = {
+	.iop_size	= xfs_rud_item_size,
+	.iop_format	= xfs_rud_item_format,
+	.iop_pin	= xfs_rud_item_pin,
+	.iop_unpin	= xfs_rud_item_unpin,
+	.iop_unlock	= xfs_rud_item_unlock,
+	.iop_committed	= xfs_rud_item_committed,
+	.iop_push	= xfs_rud_item_push,
+	.iop_committing = xfs_rud_item_committing,
+};
+
+/*
+ * Allocate and initialize an rud item with the given number of extents.
+ */
+struct xfs_rud_log_item *
+xfs_rud_init(
+	struct xfs_mount		*mp,
+	struct xfs_rui_log_item		*ruip)
+
+{
+	struct xfs_rud_log_item	*rudp;
+
+	rudp = kmem_zone_zalloc(xfs_rud_zone, KM_SLEEP);
+	xfs_log_item_init(mp, &rudp->rud_item, XFS_LI_RUD, &xfs_rud_item_ops);
+	rudp->rud_ruip = ruip;
+	rudp->rud_format.rud_rui_id = ruip->rui_format.rui_id;
+
+	return rudp;
+}
+
+/*
+ * Process an rmap update intent item that was recovered from the log.
+ * We need to update the rmapbt.
+ */
+int
+xfs_rui_recover(
+	struct xfs_mount		*mp,
+	struct xfs_rui_log_item		*ruip)
+{
+	int				i;
+	int				error = 0;
+	struct xfs_map_extent		*rmap;
+	xfs_fsblock_t			startblock_fsb;
+	bool				op_ok;
+	struct xfs_rud_log_item		*rudp;
+	enum xfs_rmap_intent_type	type;
+	int				whichfork;
+	xfs_exntst_t			state;
+	struct xfs_trans		*tp;
+	struct xfs_btree_cur		*rcur = NULL;
+
+	ASSERT(!test_bit(XFS_RUI_RECOVERED, &ruip->rui_flags));
+
+	/*
+	 * First check the validity of the extents described by the
+	 * RUI.  If any are bad, then assume that all are bad and
+	 * just toss the RUI.
+	 */
+	for (i = 0; i < ruip->rui_format.rui_nextents; i++) {
+		rmap = &ruip->rui_format.rui_extents[i];
+		startblock_fsb = XFS_BB_TO_FSB(mp,
+				   XFS_FSB_TO_DADDR(mp, rmap->me_startblock));
+		switch (rmap->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
+		case XFS_RMAP_EXTENT_MAP:
+		case XFS_RMAP_EXTENT_UNMAP:
+		case XFS_RMAP_EXTENT_CONVERT:
+		case XFS_RMAP_EXTENT_ALLOC:
+		case XFS_RMAP_EXTENT_FREE:
+			op_ok = true;
+			break;
+		default:
+			op_ok = false;
+			break;
+		}
+		if (!op_ok || startblock_fsb == 0 ||
+		    rmap->me_len == 0 ||
+		    startblock_fsb >= mp->m_sb.sb_dblocks ||
+		    rmap->me_len >= mp->m_sb.sb_agblocks ||
+		    (rmap->me_flags & ~XFS_RMAP_EXTENT_FLAGS)) {
+			/*
+			 * This will pull the RUI from the AIL and
+			 * free the memory associated with it.
+			 */
+			set_bit(XFS_RUI_RECOVERED, &ruip->rui_flags);
+			xfs_rui_release(ruip);
+			return -EIO;
+		}
+	}
+
+	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
+	if (error)
+		return error;
+	rudp = xfs_trans_get_rud(tp, ruip);
+
+	for (i = 0; i < ruip->rui_format.rui_nextents; i++) {
+		rmap = &ruip->rui_format.rui_extents[i];
+		state = (rmap->me_flags & XFS_RMAP_EXTENT_UNWRITTEN) ?
+				XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
+		whichfork = (rmap->me_flags & XFS_RMAP_EXTENT_ATTR_FORK) ?
+				XFS_ATTR_FORK : XFS_DATA_FORK;
+		switch (rmap->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
+		case XFS_RMAP_EXTENT_MAP:
+			type = XFS_RMAP_MAP;
+			break;
+		case XFS_RMAP_EXTENT_UNMAP:
+			type = XFS_RMAP_UNMAP;
+			break;
+		case XFS_RMAP_EXTENT_CONVERT:
+			type = XFS_RMAP_CONVERT;
+			break;
+		case XFS_RMAP_EXTENT_ALLOC:
+			type = XFS_RMAP_ALLOC;
+			break;
+		case XFS_RMAP_EXTENT_FREE:
+			type = XFS_RMAP_FREE;
+			break;
+		default:
+			error = -EFSCORRUPTED;
+			goto abort_error;
+		}
+		error = xfs_trans_log_finish_rmap_update(tp, rudp, type,
+				rmap->me_owner, whichfork,
+				rmap->me_startoff, rmap->me_startblock,
+				rmap->me_len, state, &rcur);
+		if (error)
+			goto abort_error;
+
+	}
+
+	xfs_rmap_finish_one_cleanup(tp, rcur, error);
+	set_bit(XFS_RUI_RECOVERED, &ruip->rui_flags);
+	error = xfs_trans_commit(tp);
+	return error;
+
+abort_error:
+	xfs_rmap_finish_one_cleanup(tp, rcur, error);
+	xfs_trans_cancel(tp);
+	return error;
+}