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Diffstat (limited to 'fs/xfs/libxfs/xfs_defer.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_defer.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h new file mode 100644 index 000000000000..cc3981c48296 --- /dev/null +++ b/fs/xfs/libxfs/xfs_defer.h @@ -0,0 +1,97 @@ +/* + * 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. + */ +#ifndef __XFS_DEFER_H__ +#define __XFS_DEFER_H__ + +struct xfs_defer_op_type; + +/* + * Save a log intent item and a list of extents, so that we can replay + * whatever action had to happen to the extent list and file the log done + * item. + */ +struct xfs_defer_pending { + const struct xfs_defer_op_type *dfp_type; /* function pointers */ + struct list_head dfp_list; /* pending items */ + bool dfp_committed; /* committed trans? */ + void *dfp_intent; /* log intent item */ + struct list_head dfp_work; /* work items */ + unsigned int dfp_count; /* # extent items */ +}; + +/* + * Header for deferred operation list. + * + * dop_low is used by the allocator to activate the lowspace algorithm - + * when free space is running low the extent allocator may choose to + * allocate an extent from an AG without leaving sufficient space for + * a btree split when inserting the new extent. In this case the allocator + * will enable the lowspace algorithm which is supposed to allow further + * allocations (such as btree splits and newroots) to allocate from + * sequential AGs. In order to avoid locking AGs out of order the lowspace + * algorithm will start searching for free space from AG 0. If the correct + * transaction reservations have been made then this algorithm will eventually + * find all the space it needs. + */ +enum xfs_defer_ops_type { + XFS_DEFER_OPS_TYPE_RMAP, + XFS_DEFER_OPS_TYPE_FREE, + XFS_DEFER_OPS_TYPE_MAX, +}; + +#define XFS_DEFER_OPS_NR_INODES 2 /* join up to two inodes */ + +struct xfs_defer_ops { + bool dop_committed; /* did any trans commit? */ + bool dop_low; /* alloc in low mode */ + struct list_head dop_intake; /* unlogged pending work */ + struct list_head dop_pending; /* logged pending work */ + + /* relog these inodes with each roll */ + struct xfs_inode *dop_inodes[XFS_DEFER_OPS_NR_INODES]; +}; + +void xfs_defer_add(struct xfs_defer_ops *dop, enum xfs_defer_ops_type type, + struct list_head *h); +int xfs_defer_finish(struct xfs_trans **tp, struct xfs_defer_ops *dop, + struct xfs_inode *ip); +void xfs_defer_cancel(struct xfs_defer_ops *dop); +void xfs_defer_init(struct xfs_defer_ops *dop, xfs_fsblock_t *fbp); +bool xfs_defer_has_unfinished_work(struct xfs_defer_ops *dop); +int xfs_defer_join(struct xfs_defer_ops *dop, struct xfs_inode *ip); + +/* Description of a deferred type. */ +struct xfs_defer_op_type { + enum xfs_defer_ops_type type; + unsigned int max_items; + void (*abort_intent)(void *); + void *(*create_done)(struct xfs_trans *, void *, unsigned int); + int (*finish_item)(struct xfs_trans *, struct xfs_defer_ops *, + struct list_head *, void *, void **); + void (*finish_cleanup)(struct xfs_trans *, void *, int); + void (*cancel_item)(struct list_head *); + int (*diff_items)(void *, struct list_head *, struct list_head *); + void *(*create_intent)(struct xfs_trans *, uint); + void (*log_item)(struct xfs_trans *, void *, struct list_head *); +}; + +void xfs_defer_init_op_type(const struct xfs_defer_op_type *type); + +#endif /* __XFS_DEFER_H__ */ |