linux_kernel/fs/xfs/libxfs/xfs_rmap.h

/*
 * 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_RMAP_H__
#define __XFS_RMAP_H__

static inline void
xfs_rmap_ag_owner(
	struct xfs_owner_info	*oi,
	uint64_t		owner)
{
	oi->oi_owner = owner;
	oi->oi_offset = 0;
	oi->oi_flags = 0;
}

static inline void
xfs_rmap_ino_bmbt_owner(
	struct xfs_owner_info	*oi,
	xfs_ino_t		ino,
	int			whichfork)
{
	oi->oi_owner = ino;
	oi->oi_offset = 0;
	oi->oi_flags = XFS_OWNER_INFO_BMBT_BLOCK;
	if (whichfork == XFS_ATTR_FORK)
		oi->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
}

static inline void
xfs_rmap_ino_owner(
	struct xfs_owner_info	*oi,
	xfs_ino_t		ino,
	int			whichfork,
	xfs_fileoff_t		offset)
{
	oi->oi_owner = ino;
	oi->oi_offset = offset;
	oi->oi_flags = 0;
	if (whichfork == XFS_ATTR_FORK)
		oi->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
}

static inline void
xfs_rmap_skip_owner_update(
	struct xfs_owner_info	*oi)
{
	xfs_rmap_ag_owner(oi, XFS_RMAP_OWN_NULL);
}

static inline bool
xfs_rmap_should_skip_owner_update(
	struct xfs_owner_info	*oi)
{
	return oi->oi_owner == XFS_RMAP_OWN_NULL;
}

static inline void
xfs_rmap_any_owner_update(
	struct xfs_owner_info	*oi)
{
	xfs_rmap_ag_owner(oi, XFS_RMAP_OWN_UNKNOWN);
}

/* Reverse mapping functions. */

struct xfs_buf;

static inline __u64
xfs_rmap_irec_offset_pack(
	const struct xfs_rmap_irec	*irec)
{
	__u64			x;

	x = XFS_RMAP_OFF(irec->rm_offset);
	if (irec->rm_flags & XFS_RMAP_ATTR_FORK)
		x |= XFS_RMAP_OFF_ATTR_FORK;
	if (irec->rm_flags & XFS_RMAP_BMBT_BLOCK)
		x |= XFS_RMAP_OFF_BMBT_BLOCK;
	if (irec->rm_flags & XFS_RMAP_UNWRITTEN)
		x |= XFS_RMAP_OFF_UNWRITTEN;
	return x;
}

static inline int
xfs_rmap_irec_offset_unpack(
	__u64			offset,
	struct xfs_rmap_irec	*irec)
{
	if (offset & ~(XFS_RMAP_OFF_MASK | XFS_RMAP_OFF_FLAGS))
		return -EFSCORRUPTED;
	irec->rm_offset = XFS_RMAP_OFF(offset);
	if (offset & XFS_RMAP_OFF_ATTR_FORK)
		irec->rm_flags |= XFS_RMAP_ATTR_FORK;
	if (offset & XFS_RMAP_OFF_BMBT_BLOCK)
		irec->rm_flags |= XFS_RMAP_BMBT_BLOCK;
	if (offset & XFS_RMAP_OFF_UNWRITTEN)
		irec->rm_flags |= XFS_RMAP_UNWRITTEN;
	return 0;
}

static inline void
xfs_owner_info_unpack(
	struct xfs_owner_info	*oinfo,
	uint64_t		*owner,
	uint64_t		*offset,
	unsigned int		*flags)
{
	unsigned int		r = 0;

	*owner = oinfo->oi_owner;
	*offset = oinfo->oi_offset;
	if (oinfo->oi_flags & XFS_OWNER_INFO_ATTR_FORK)
		r |= XFS_RMAP_ATTR_FORK;
	if (oinfo->oi_flags & XFS_OWNER_INFO_BMBT_BLOCK)
		r |= XFS_RMAP_BMBT_BLOCK;
	*flags = r;
}

static inline void
xfs_owner_info_pack(
	struct xfs_owner_info	*oinfo,
	uint64_t		owner,
	uint64_t		offset,
	unsigned int		flags)
{
	oinfo->oi_owner = owner;
	oinfo->oi_offset = XFS_RMAP_OFF(offset);
	oinfo->oi_flags = 0;
	if (flags & XFS_RMAP_ATTR_FORK)
		oinfo->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
	if (flags & XFS_RMAP_BMBT_BLOCK)
		oinfo->oi_flags |= XFS_OWNER_INFO_BMBT_BLOCK;
}

int xfs_rmap_alloc(struct xfs_trans *tp, struct xfs_buf *agbp,
		   xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
		   struct xfs_owner_info *oinfo);
int xfs_rmap_free(struct xfs_trans *tp, struct xfs_buf *agbp,
		  xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
		  struct xfs_owner_info *oinfo);

int xfs_rmap_lookup_le(struct xfs_btree_cur *cur, xfs_agblock_t bno,
		xfs_extlen_t len, uint64_t owner, uint64_t offset,
		unsigned int flags, int *stat);
int xfs_rmap_lookup_eq(struct xfs_btree_cur *cur, xfs_agblock_t bno,
		xfs_extlen_t len, uint64_t owner, uint64_t offset,
		unsigned int flags, int *stat);
int xfs_rmap_insert(struct xfs_btree_cur *rcur, xfs_agblock_t agbno,
		xfs_extlen_t len, uint64_t owner, uint64_t offset,
		unsigned int flags);
int xfs_rmap_get_rec(struct xfs_btree_cur *cur, struct xfs_rmap_irec *irec,
		int *stat);

typedef int (*xfs_rmap_query_range_fn)(
	struct xfs_btree_cur	*cur,
	struct xfs_rmap_irec	*rec,
	void			*priv);

int xfs_rmap_query_range(struct xfs_btree_cur *cur,
		struct xfs_rmap_irec *low_rec, struct xfs_rmap_irec *high_rec,
		xfs_rmap_query_range_fn fn, void *priv);
int xfs_rmap_query_all(struct xfs_btree_cur *cur, xfs_rmap_query_range_fn fn,
		void *priv);

enum xfs_rmap_intent_type {
	XFS_RMAP_MAP,
	XFS_RMAP_MAP_SHARED,
	XFS_RMAP_UNMAP,
	XFS_RMAP_UNMAP_SHARED,
	XFS_RMAP_CONVERT,
	XFS_RMAP_CONVERT_SHARED,
	XFS_RMAP_ALLOC,
	XFS_RMAP_FREE,
};

struct xfs_rmap_intent {
	struct list_head			ri_list;
	enum xfs_rmap_intent_type		ri_type;
	uint64_t				ri_owner;
	int					ri_whichfork;
	struct xfs_bmbt_irec			ri_bmap;
};

/* functions for updating the rmapbt based on bmbt map/unmap operations */
int xfs_rmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
		struct xfs_inode *ip, int whichfork,
		struct xfs_bmbt_irec *imap);
int xfs_rmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
		struct xfs_inode *ip, int whichfork,
		struct xfs_bmbt_irec *imap);
int xfs_rmap_convert_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
		struct xfs_inode *ip, int whichfork,
		struct xfs_bmbt_irec *imap);
int xfs_rmap_alloc_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
		xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
		uint64_t owner);
int xfs_rmap_free_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
		xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
		uint64_t owner);

void xfs_rmap_finish_one_cleanup(struct xfs_trans *tp,
		struct xfs_btree_cur *rcur, int error);
int xfs_rmap_finish_one(struct xfs_trans *tp, enum xfs_rmap_intent_type type,
		uint64_t owner, int whichfork, xfs_fileoff_t startoff,
		xfs_fsblock_t startblock, xfs_filblks_t blockcount,
		xfs_exntst_t state, struct xfs_btree_cur **pcur);

int xfs_rmap_find_left_neighbor(struct xfs_btree_cur *cur, xfs_agblock_t bno,
		uint64_t owner, uint64_t offset, unsigned int flags,
		struct xfs_rmap_irec *irec, int	*stat);
int xfs_rmap_lookup_le_range(struct xfs_btree_cur *cur, xfs_agblock_t bno,
		uint64_t owner, uint64_t offset, unsigned int flags,
		struct xfs_rmap_irec *irec, int	*stat);
int xfs_rmap_compare(const struct xfs_rmap_irec *a,
		const struct xfs_rmap_irec *b);
union xfs_btree_rec;
int xfs_rmap_btrec_to_irec(union xfs_btree_rec *rec,
		struct xfs_rmap_irec *irec);
int xfs_rmap_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno,
		xfs_extlen_t len, bool *exists);
int xfs_rmap_record_exists(struct xfs_btree_cur *cur, xfs_agblock_t bno,
		xfs_extlen_t len, struct xfs_owner_info *oinfo,
		bool *has_rmap);

#endif	/* __XFS_RMAP_H__ */