v4.19.13 snapshot.
diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c
new file mode 100644
index 0000000..ce45f06
--- /dev/null
+++ b/fs/xfs/xfs_bmap_item.c
@@ -0,0 +1,510 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#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_inode.h"
+#include "xfs_trans.h"
+#include "xfs_trans_priv.h"
+#include "xfs_buf_item.h"
+#include "xfs_bmap_item.h"
+#include "xfs_log.h"
+#include "xfs_bmap.h"
+#include "xfs_icache.h"
+#include "xfs_trace.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_trans_space.h"
+
+
+kmem_zone_t *xfs_bui_zone;
+kmem_zone_t *xfs_bud_zone;
+
+static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip)
+{
+ return container_of(lip, struct xfs_bui_log_item, bui_item);
+}
+
+void
+xfs_bui_item_free(
+ struct xfs_bui_log_item *buip)
+{
+ kmem_zone_free(xfs_bui_zone, buip);
+}
+
+/*
+ * Freeing the BUI requires that we remove it from the AIL if it has already
+ * been placed there. However, the BUI may not yet have been placed in the AIL
+ * when called by xfs_bui_release() from BUD 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 BUI.
+ */
+void
+xfs_bui_release(
+ struct xfs_bui_log_item *buip)
+{
+ ASSERT(atomic_read(&buip->bui_refcount) > 0);
+ if (atomic_dec_and_test(&buip->bui_refcount)) {
+ xfs_trans_ail_remove(&buip->bui_item, SHUTDOWN_LOG_IO_ERROR);
+ xfs_bui_item_free(buip);
+ }
+}
+
+
+STATIC void
+xfs_bui_item_size(
+ struct xfs_log_item *lip,
+ int *nvecs,
+ int *nbytes)
+{
+ struct xfs_bui_log_item *buip = BUI_ITEM(lip);
+
+ *nvecs += 1;
+ *nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents);
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given bui log item. We use only 1 iovec, and we point that
+ * at the bui_log_format structure embedded in the bui item.
+ * It is at this point that we assert that all of the extent
+ * slots in the bui item have been filled.
+ */
+STATIC void
+xfs_bui_item_format(
+ struct xfs_log_item *lip,
+ struct xfs_log_vec *lv)
+{
+ struct xfs_bui_log_item *buip = BUI_ITEM(lip);
+ struct xfs_log_iovec *vecp = NULL;
+
+ ASSERT(atomic_read(&buip->bui_next_extent) ==
+ buip->bui_format.bui_nextents);
+
+ buip->bui_format.bui_type = XFS_LI_BUI;
+ buip->bui_format.bui_size = 1;
+
+ xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format,
+ xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents));
+}
+
+/*
+ * Pinning has no meaning for an bui item, so just return.
+ */
+STATIC void
+xfs_bui_item_pin(
+ struct xfs_log_item *lip)
+{
+}
+
+/*
+ * The unpin operation is the last place an BUI 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 BUI transaction has been successfully committed to make it
+ * this far. Therefore, we expect whoever committed the BUI to either construct
+ * and commit the BUD or drop the BUD's reference in the event of error. Simply
+ * drop the log's BUI reference now that the log is done with it.
+ */
+STATIC void
+xfs_bui_item_unpin(
+ struct xfs_log_item *lip,
+ int remove)
+{
+ struct xfs_bui_log_item *buip = BUI_ITEM(lip);
+
+ xfs_bui_release(buip);
+}
+
+/*
+ * BUI items have no locking or pushing. However, since BUIs are pulled from
+ * the AIL when their corresponding BUDs 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 BUI out of
+ * the AIL.
+ */
+STATIC uint
+xfs_bui_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
+{
+ return XFS_ITEM_PINNED;
+}
+
+/*
+ * The BUI has been either committed or aborted if the transaction has been
+ * cancelled. If the transaction was cancelled, an BUD isn't going to be
+ * constructed and thus we free the BUI here directly.
+ */
+STATIC void
+xfs_bui_item_unlock(
+ struct xfs_log_item *lip)
+{
+ if (test_bit(XFS_LI_ABORTED, &lip->li_flags))
+ xfs_bui_release(BUI_ITEM(lip));
+}
+
+/*
+ * The BUI 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_bui_item_committed(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+ return lsn;
+}
+
+/*
+ * The BUI 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_bui_item_committing(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+}
+
+/*
+ * This is the ops vector shared by all bui log items.
+ */
+static const struct xfs_item_ops xfs_bui_item_ops = {
+ .iop_size = xfs_bui_item_size,
+ .iop_format = xfs_bui_item_format,
+ .iop_pin = xfs_bui_item_pin,
+ .iop_unpin = xfs_bui_item_unpin,
+ .iop_unlock = xfs_bui_item_unlock,
+ .iop_committed = xfs_bui_item_committed,
+ .iop_push = xfs_bui_item_push,
+ .iop_committing = xfs_bui_item_committing,
+};
+
+/*
+ * Allocate and initialize an bui item with the given number of extents.
+ */
+struct xfs_bui_log_item *
+xfs_bui_init(
+ struct xfs_mount *mp)
+
+{
+ struct xfs_bui_log_item *buip;
+
+ buip = kmem_zone_zalloc(xfs_bui_zone, KM_SLEEP);
+
+ xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops);
+ buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS;
+ buip->bui_format.bui_id = (uintptr_t)(void *)buip;
+ atomic_set(&buip->bui_next_extent, 0);
+ atomic_set(&buip->bui_refcount, 2);
+
+ return buip;
+}
+
+static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip)
+{
+ return container_of(lip, struct xfs_bud_log_item, bud_item);
+}
+
+STATIC void
+xfs_bud_item_size(
+ struct xfs_log_item *lip,
+ int *nvecs,
+ int *nbytes)
+{
+ *nvecs += 1;
+ *nbytes += sizeof(struct xfs_bud_log_format);
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given bud log item. We use only 1 iovec, and we point that
+ * at the bud_log_format structure embedded in the bud item.
+ * It is at this point that we assert that all of the extent
+ * slots in the bud item have been filled.
+ */
+STATIC void
+xfs_bud_item_format(
+ struct xfs_log_item *lip,
+ struct xfs_log_vec *lv)
+{
+ struct xfs_bud_log_item *budp = BUD_ITEM(lip);
+ struct xfs_log_iovec *vecp = NULL;
+
+ budp->bud_format.bud_type = XFS_LI_BUD;
+ budp->bud_format.bud_size = 1;
+
+ xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format,
+ sizeof(struct xfs_bud_log_format));
+}
+
+/*
+ * Pinning has no meaning for an bud item, so just return.
+ */
+STATIC void
+xfs_bud_item_pin(
+ struct xfs_log_item *lip)
+{
+}
+
+/*
+ * Since pinning has no meaning for an bud item, unpinning does
+ * not either.
+ */
+STATIC void
+xfs_bud_item_unpin(
+ struct xfs_log_item *lip,
+ int remove)
+{
+}
+
+/*
+ * There isn't much you can do to push on an bud item. It is simply stuck
+ * waiting for the log to be flushed to disk.
+ */
+STATIC uint
+xfs_bud_item_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
+{
+ return XFS_ITEM_PINNED;
+}
+
+/*
+ * The BUD is either committed or aborted if the transaction is cancelled. If
+ * the transaction is cancelled, drop our reference to the BUI and free the
+ * BUD.
+ */
+STATIC void
+xfs_bud_item_unlock(
+ struct xfs_log_item *lip)
+{
+ struct xfs_bud_log_item *budp = BUD_ITEM(lip);
+
+ if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) {
+ xfs_bui_release(budp->bud_buip);
+ kmem_zone_free(xfs_bud_zone, budp);
+ }
+}
+
+/*
+ * When the bud item is committed to disk, all we need to do is delete our
+ * reference to our partner bui 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_bud_item_committed(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+ struct xfs_bud_log_item *budp = BUD_ITEM(lip);
+
+ /*
+ * Drop the BUI reference regardless of whether the BUD has been
+ * aborted. Once the BUD transaction is constructed, it is the sole
+ * responsibility of the BUD to release the BUI (even if the BUI is
+ * aborted due to log I/O error).
+ */
+ xfs_bui_release(budp->bud_buip);
+ kmem_zone_free(xfs_bud_zone, budp);
+
+ return (xfs_lsn_t)-1;
+}
+
+/*
+ * The BUD 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_bud_item_committing(
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn)
+{
+}
+
+/*
+ * This is the ops vector shared by all bud log items.
+ */
+static const struct xfs_item_ops xfs_bud_item_ops = {
+ .iop_size = xfs_bud_item_size,
+ .iop_format = xfs_bud_item_format,
+ .iop_pin = xfs_bud_item_pin,
+ .iop_unpin = xfs_bud_item_unpin,
+ .iop_unlock = xfs_bud_item_unlock,
+ .iop_committed = xfs_bud_item_committed,
+ .iop_push = xfs_bud_item_push,
+ .iop_committing = xfs_bud_item_committing,
+};
+
+/*
+ * Allocate and initialize an bud item with the given number of extents.
+ */
+struct xfs_bud_log_item *
+xfs_bud_init(
+ struct xfs_mount *mp,
+ struct xfs_bui_log_item *buip)
+
+{
+ struct xfs_bud_log_item *budp;
+
+ budp = kmem_zone_zalloc(xfs_bud_zone, KM_SLEEP);
+ xfs_log_item_init(mp, &budp->bud_item, XFS_LI_BUD, &xfs_bud_item_ops);
+ budp->bud_buip = buip;
+ budp->bud_format.bud_bui_id = buip->bui_format.bui_id;
+
+ return budp;
+}
+
+/*
+ * Process a bmap update intent item that was recovered from the log.
+ * We need to update some inode's bmbt.
+ */
+int
+xfs_bui_recover(
+ struct xfs_trans *parent_tp,
+ struct xfs_bui_log_item *buip)
+{
+ int error = 0;
+ unsigned int bui_type;
+ struct xfs_map_extent *bmap;
+ xfs_fsblock_t startblock_fsb;
+ xfs_fsblock_t inode_fsb;
+ xfs_filblks_t count;
+ bool op_ok;
+ struct xfs_bud_log_item *budp;
+ enum xfs_bmap_intent_type type;
+ int whichfork;
+ xfs_exntst_t state;
+ struct xfs_trans *tp;
+ struct xfs_inode *ip = NULL;
+ struct xfs_bmbt_irec irec;
+ struct xfs_mount *mp = parent_tp->t_mountp;
+
+ ASSERT(!test_bit(XFS_BUI_RECOVERED, &buip->bui_flags));
+
+ /* Only one mapping operation per BUI... */
+ if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) {
+ set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
+ xfs_bui_release(buip);
+ return -EIO;
+ }
+
+ /*
+ * First check the validity of the extent described by the
+ * BUI. If anything is bad, then toss the BUI.
+ */
+ bmap = &buip->bui_format.bui_extents[0];
+ startblock_fsb = XFS_BB_TO_FSB(mp,
+ XFS_FSB_TO_DADDR(mp, bmap->me_startblock));
+ inode_fsb = XFS_BB_TO_FSB(mp, XFS_FSB_TO_DADDR(mp,
+ XFS_INO_TO_FSB(mp, bmap->me_owner)));
+ switch (bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) {
+ case XFS_BMAP_MAP:
+ case XFS_BMAP_UNMAP:
+ op_ok = true;
+ break;
+ default:
+ op_ok = false;
+ break;
+ }
+ if (!op_ok || startblock_fsb == 0 ||
+ bmap->me_len == 0 ||
+ inode_fsb == 0 ||
+ startblock_fsb >= mp->m_sb.sb_dblocks ||
+ bmap->me_len >= mp->m_sb.sb_agblocks ||
+ inode_fsb >= mp->m_sb.sb_dblocks ||
+ (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS)) {
+ /*
+ * This will pull the BUI from the AIL and
+ * free the memory associated with it.
+ */
+ set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
+ xfs_bui_release(buip);
+ return -EIO;
+ }
+
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
+ XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
+ if (error)
+ return error;
+ /*
+ * Recovery stashes all deferred ops during intent processing and
+ * finishes them on completion. Transfer current dfops state to this
+ * transaction and transfer the result back before we return.
+ */
+ xfs_defer_move(tp, parent_tp);
+ budp = xfs_trans_get_bud(tp, buip);
+
+ /* Grab the inode. */
+ error = xfs_iget(mp, tp, bmap->me_owner, 0, XFS_ILOCK_EXCL, &ip);
+ if (error)
+ goto err_inode;
+
+ if (VFS_I(ip)->i_nlink == 0)
+ xfs_iflags_set(ip, XFS_IRECOVERY);
+
+ /* Process deferred bmap item. */
+ state = (bmap->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ?
+ XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
+ whichfork = (bmap->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+ bui_type = bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK;
+ switch (bui_type) {
+ case XFS_BMAP_MAP:
+ case XFS_BMAP_UNMAP:
+ type = bui_type;
+ break;
+ default:
+ error = -EFSCORRUPTED;
+ goto err_inode;
+ }
+ xfs_trans_ijoin(tp, ip, 0);
+
+ count = bmap->me_len;
+ error = xfs_trans_log_finish_bmap_update(tp, budp, type, ip, whichfork,
+ bmap->me_startoff, bmap->me_startblock, &count, state);
+ if (error)
+ goto err_inode;
+
+ if (count > 0) {
+ ASSERT(type == XFS_BMAP_UNMAP);
+ irec.br_startblock = bmap->me_startblock;
+ irec.br_blockcount = count;
+ irec.br_startoff = bmap->me_startoff;
+ irec.br_state = state;
+ error = xfs_bmap_unmap_extent(tp, ip, &irec);
+ if (error)
+ goto err_inode;
+ }
+
+ set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
+ xfs_defer_move(parent_tp, tp);
+ error = xfs_trans_commit(tp);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_irele(ip);
+
+ return error;
+
+err_inode:
+ xfs_defer_move(parent_tp, tp);
+ xfs_trans_cancel(tp);
+ if (ip) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_irele(ip);
+ }
+ return error;
+}