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When log recovery tries to recover a transaction that had log intent items attached to it, it has to save certain parts of the transaction state (reservation, dfops chain, inodes with no automatic unlock) so that it can finish single-stepping the recovered transactions before finishing the chains. This is done with the xfs_defer_ops_capture and xfs_defer_ops_continue functions. Right now they open-code this functionality, so let's port this to the formalized resource capture structure that we introduced in the previous patch. This enables us to hold up to two inodes and two buffers during log recovery, the same way we do for regular runtime. With this patch applied, we'll be ready to support atomic extent swap which holds two inodes; and logged xattrs which holds one inode and one xattr leaf buffer. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#ifndef __XFS_DEFER_H__
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#define __XFS_DEFER_H__
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struct xfs_btree_cur;
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struct xfs_defer_op_type;
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struct xfs_defer_capture;
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/*
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* Header for deferred operation list.
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*/
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enum xfs_defer_ops_type {
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XFS_DEFER_OPS_TYPE_BMAP,
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XFS_DEFER_OPS_TYPE_REFCOUNT,
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XFS_DEFER_OPS_TYPE_RMAP,
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XFS_DEFER_OPS_TYPE_FREE,
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XFS_DEFER_OPS_TYPE_AGFL_FREE,
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XFS_DEFER_OPS_TYPE_MAX,
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};
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/*
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* Save a log intent item and a list of extents, so that we can replay
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* whatever action had to happen to the extent list and file the log done
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* item.
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*/
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struct xfs_defer_pending {
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struct list_head dfp_list; /* pending items */
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struct list_head dfp_work; /* work items */
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struct xfs_log_item *dfp_intent; /* log intent item */
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struct xfs_log_item *dfp_done; /* log done item */
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unsigned int dfp_count; /* # extent items */
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enum xfs_defer_ops_type dfp_type;
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};
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void xfs_defer_add(struct xfs_trans *tp, enum xfs_defer_ops_type type,
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struct list_head *h);
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int xfs_defer_finish_noroll(struct xfs_trans **tp);
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int xfs_defer_finish(struct xfs_trans **tp);
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void xfs_defer_cancel(struct xfs_trans *);
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void xfs_defer_move(struct xfs_trans *dtp, struct xfs_trans *stp);
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/* Description of a deferred type. */
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struct xfs_defer_op_type {
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struct xfs_log_item *(*create_intent)(struct xfs_trans *tp,
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struct list_head *items, unsigned int count, bool sort);
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void (*abort_intent)(struct xfs_log_item *intent);
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struct xfs_log_item *(*create_done)(struct xfs_trans *tp,
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struct xfs_log_item *intent, unsigned int count);
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int (*finish_item)(struct xfs_trans *tp, struct xfs_log_item *done,
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struct list_head *item, struct xfs_btree_cur **state);
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void (*finish_cleanup)(struct xfs_trans *tp,
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struct xfs_btree_cur *state, int error);
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void (*cancel_item)(struct list_head *item);
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unsigned int max_items;
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};
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extern const struct xfs_defer_op_type xfs_bmap_update_defer_type;
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extern const struct xfs_defer_op_type xfs_refcount_update_defer_type;
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extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
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extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
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extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
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/*
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* Deferred operation item relogging limits.
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*/
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#define XFS_DEFER_OPS_NR_INODES 2 /* join up to two inodes */
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#define XFS_DEFER_OPS_NR_BUFS 2 /* join up to two buffers */
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/* Resources that must be held across a transaction roll. */
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struct xfs_defer_resources {
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/* held buffers */
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struct xfs_buf *dr_bp[XFS_DEFER_OPS_NR_BUFS];
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/* inodes with no unlock flags */
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struct xfs_inode *dr_ip[XFS_DEFER_OPS_NR_INODES];
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/* number of held buffers */
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unsigned short dr_bufs;
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/* bitmap of ordered buffers */
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unsigned short dr_ordered;
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/* number of held inodes */
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unsigned short dr_inos;
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};
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/*
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* This structure enables a dfops user to detach the chain of deferred
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* operations from a transaction so that they can be continued later.
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*/
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struct xfs_defer_capture {
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/* List of other capture structures. */
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struct list_head dfc_list;
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/* Deferred ops state saved from the transaction. */
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struct list_head dfc_dfops;
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unsigned int dfc_tpflags;
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/* Block reservations for the data and rt devices. */
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unsigned int dfc_blkres;
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unsigned int dfc_rtxres;
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/* Log reservation saved from the transaction. */
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unsigned int dfc_logres;
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struct xfs_defer_resources dfc_held;
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};
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/*
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* Functions to capture a chain of deferred operations and continue them later.
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* This doesn't normally happen except log recovery.
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*/
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int xfs_defer_ops_capture_and_commit(struct xfs_trans *tp,
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struct list_head *capture_list);
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void xfs_defer_ops_continue(struct xfs_defer_capture *d, struct xfs_trans *tp,
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struct xfs_defer_resources *dres);
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void xfs_defer_ops_capture_free(struct xfs_mount *mp,
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struct xfs_defer_capture *d);
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void xfs_defer_resources_rele(struct xfs_defer_resources *dres);
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#endif /* __XFS_DEFER_H__ */
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