From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- fs/xfs/xfs_refcount_item.h | 87 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 fs/xfs/xfs_refcount_item.h (limited to 'fs/xfs/xfs_refcount_item.h') diff --git a/fs/xfs/xfs_refcount_item.h b/fs/xfs/xfs_refcount_item.h new file mode 100644 index 000000000..3896dcc23 --- /dev/null +++ b/fs/xfs/xfs_refcount_item.h @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * Author: Darrick J. Wong + */ +#ifndef __XFS_REFCOUNT_ITEM_H__ +#define __XFS_REFCOUNT_ITEM_H__ + +/* + * There are (currently) two pairs of refcount btree redo item types: + * increase and decrease. The log items for these are CUI (refcount + * update intent) and CUD (refcount update done). The redo item type + * is encoded in the flags field of each xfs_map_extent. + * + * *I items should be recorded in the *first* of a series of rolled + * transactions, and the *D items should be recorded in the same + * transaction that records the associated refcountbt updates. + * + * Should the system crash after the commit of the first transaction + * but before the commit of the final transaction in a series, log + * recovery will use the redo information recorded by the intent items + * to replay the refcountbt metadata updates. + */ + +/* kernel only CUI/CUD definitions */ + +struct xfs_mount; +struct kmem_zone; + +/* + * Max number of extents in fast allocation path. + */ +#define XFS_CUI_MAX_FAST_EXTENTS 16 + +/* + * Define CUI flag bits. Manipulated by set/clear/test_bit operators. + */ +#define XFS_CUI_RECOVERED 1 + +/* + * This is the "refcount update intent" log item. It is used to log + * the fact that some reverse mappings need to change. It is used in + * conjunction with the "refcount update done" log item described + * below. + * + * These log items follow the same rules as struct xfs_efi_log_item; + * see the comments about that structure (in xfs_extfree_item.h) for + * more details. + */ +struct xfs_cui_log_item { + struct xfs_log_item cui_item; + atomic_t cui_refcount; + atomic_t cui_next_extent; + unsigned long cui_flags; /* misc flags */ + struct xfs_cui_log_format cui_format; +}; + +static inline size_t +xfs_cui_log_item_sizeof( + unsigned int nr) +{ + return offsetof(struct xfs_cui_log_item, cui_format) + + xfs_cui_log_format_sizeof(nr); +} + +/* + * This is the "refcount update done" log item. It is used to log the + * fact that some refcountbt updates mentioned in an earlier cui item + * have been performed. + */ +struct xfs_cud_log_item { + struct xfs_log_item cud_item; + struct xfs_cui_log_item *cud_cuip; + struct xfs_cud_log_format cud_format; +}; + +extern struct kmem_zone *xfs_cui_zone; +extern struct kmem_zone *xfs_cud_zone; + +struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint); +struct xfs_cud_log_item *xfs_cud_init(struct xfs_mount *, + struct xfs_cui_log_item *); +void xfs_cui_item_free(struct xfs_cui_log_item *); +void xfs_cui_release(struct xfs_cui_log_item *); +int xfs_cui_recover(struct xfs_trans *parent_tp, struct xfs_cui_log_item *cuip); + +#endif /* __XFS_REFCOUNT_ITEM_H__ */ -- cgit v1.2.3