1 files changed, 279 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h
new file mode 100644
index 0000000000..6bb8d295c3
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_alloc.h
@@ -0,0 +1,279 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_ALLOC_H__
+#define	__XFS_ALLOC_H__
+
+struct xfs_buf;
+struct xfs_btree_cur;
+struct xfs_mount;
+struct xfs_perag;
+struct xfs_trans;
+
+extern struct workqueue_struct *xfs_alloc_wq;
+
+unsigned int xfs_agfl_size(struct xfs_mount *mp);
+
+/*
+ * Flags for xfs_alloc_fix_freelist.
+ */
+#define	XFS_ALLOC_FLAG_TRYLOCK	(1U << 0)  /* use trylock for buffer locking */
+#define	XFS_ALLOC_FLAG_FREEING	(1U << 1)  /* indicate caller is freeing extents*/
+#define	XFS_ALLOC_FLAG_NORMAP	(1U << 2)  /* don't modify the rmapbt */
+#define	XFS_ALLOC_FLAG_NOSHRINK	(1U << 3)  /* don't shrink the freelist */
+#define	XFS_ALLOC_FLAG_CHECK	(1U << 4)  /* test only, don't modify args */
+#define	XFS_ALLOC_FLAG_TRYFLUSH	(1U << 5)  /* don't wait in busy extent flush */
+
+/*
+ * Argument structure for xfs_alloc routines.
+ * This is turned into a structure to avoid having 20 arguments passed
+ * down several levels of the stack.
+ */
+typedef struct xfs_alloc_arg {
+	struct xfs_trans *tp;		/* transaction pointer */
+	struct xfs_mount *mp;		/* file system mount point */
+	struct xfs_buf	*agbp;		/* buffer for a.g. freelist header */
+	struct xfs_perag *pag;		/* per-ag struct for this agno */
+	xfs_fsblock_t	fsbno;		/* file system block number */
+	xfs_agnumber_t	agno;		/* allocation group number */
+	xfs_agblock_t	agbno;		/* allocation group-relative block # */
+	xfs_extlen_t	minlen;		/* minimum size of extent */
+	xfs_extlen_t	maxlen;		/* maximum size of extent */
+	xfs_extlen_t	mod;		/* mod value for extent size */
+	xfs_extlen_t	prod;		/* prod value for extent size */
+	xfs_extlen_t	minleft;	/* min blocks must be left after us */
+	xfs_extlen_t	total;		/* total blocks needed in xaction */
+	xfs_extlen_t	alignment;	/* align answer to multiple of this */
+	xfs_extlen_t	minalignslop;	/* slop for minlen+alignment calcs */
+	xfs_agblock_t	min_agbno;	/* set an agbno range for NEAR allocs */
+	xfs_agblock_t	max_agbno;	/* ... */
+	xfs_extlen_t	len;		/* output: actual size of extent */
+	int		datatype;	/* mask defining data type treatment */
+	char		wasdel;		/* set if allocation was prev delayed */
+	char		wasfromfl;	/* set if allocation is from freelist */
+	struct xfs_owner_info	oinfo;	/* owner of blocks being allocated */
+	enum xfs_ag_resv_type	resv;	/* block reservation to use */
+#ifdef DEBUG
+	bool		alloc_minlen_only; /* allocate exact minlen extent */
+#endif
+} xfs_alloc_arg_t;
+
+/*
+ * Defines for datatype
+ */
+#define XFS_ALLOC_USERDATA		(1 << 0)/* allocation is for user data*/
+#define XFS_ALLOC_INITIAL_USER_DATA	(1 << 1)/* special case start of file */
+#define XFS_ALLOC_NOBUSY		(1 << 2)/* Busy extents not allowed */
+
+/* freespace limit calculations */
+unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
+unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
+
+xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag,
+		xfs_extlen_t need, xfs_extlen_t reserved);
+unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
+		struct xfs_perag *pag);
+int xfs_alloc_get_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
+		struct xfs_buf *agfbp, xfs_agblock_t *bnop, int	 btreeblk);
+int xfs_alloc_put_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
+		struct xfs_buf *agfbp, struct xfs_buf *agflbp,
+		xfs_agblock_t bno, int btreeblk);
+
+/*
+ * Compute and fill in value of m_alloc_maxlevels.
+ */
+void
+xfs_alloc_compute_maxlevels(
+	struct xfs_mount	*mp);	/* file system mount structure */
+
+/*
+ * Log the given fields from the agf structure.
+ */
+void
+xfs_alloc_log_agf(
+	struct xfs_trans *tp,	/* transaction pointer */
+	struct xfs_buf	*bp,	/* buffer for a.g. freelist header */
+	uint32_t	fields);/* mask of fields to be logged (XFS_AGF_...) */
+
+/*
+ * Allocate an extent anywhere in the specific AG given. If there is no
+ * space matching the requirements in that AG, then the allocation will fail.
+ */
+int xfs_alloc_vextent_this_ag(struct xfs_alloc_arg *args, xfs_agnumber_t agno);
+
+/*
+ * Allocate an extent as close to the target as possible. If there are not
+ * viable candidates in the AG, then fail the allocation.
+ */
+int xfs_alloc_vextent_near_bno(struct xfs_alloc_arg *args,
+		xfs_fsblock_t target);
+
+/*
+ * Allocate an extent exactly at the target given. If this is not possible
+ * then the allocation fails.
+ */
+int xfs_alloc_vextent_exact_bno(struct xfs_alloc_arg *args,
+		xfs_fsblock_t target);
+
+/*
+ * Best effort full filesystem allocation scan.
+ *
+ * Locality aware allocation will be attempted in the initial AG, but on failure
+ * non-localised attempts will be made. The AGs are constrained by previous
+ * allocations in the current transaction. Two passes will be made - the first
+ * non-blocking, the second blocking.
+ */
+int xfs_alloc_vextent_start_ag(struct xfs_alloc_arg *args,
+		xfs_fsblock_t target);
+
+/*
+ * Iterate from the AG indicated from args->fsbno through to the end of the
+ * filesystem attempting blocking allocation. This is for use in last
+ * resort allocation attempts when everything else has failed.
+ */
+int xfs_alloc_vextent_first_ag(struct xfs_alloc_arg *args,
+		xfs_fsblock_t target);
+
+/*
+ * Free an extent.
+ */
+int				/* error */
+__xfs_free_extent(
+	struct xfs_trans	*tp,	/* transaction pointer */
+	struct xfs_perag	*pag,
+	xfs_agblock_t		agbno,
+	xfs_extlen_t		len,	/* length of extent */
+	const struct xfs_owner_info	*oinfo,	/* extent owner */
+	enum xfs_ag_resv_type	type,	/* block reservation type */
+	bool			skip_discard);
+
+static inline int
+xfs_free_extent(
+	struct xfs_trans	*tp,
+	struct xfs_perag	*pag,
+	xfs_agblock_t		agbno,
+	xfs_extlen_t		len,
+	const struct xfs_owner_info	*oinfo,
+	enum xfs_ag_resv_type	type)
+{
+	return __xfs_free_extent(tp, pag, agbno, len, oinfo, type, false);
+}
+
+int				/* error */
+xfs_alloc_lookup_le(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	xfs_agblock_t		bno,	/* starting block of extent */
+	xfs_extlen_t		len,	/* length of extent */
+	int			*stat);	/* success/failure */
+
+int				/* error */
+xfs_alloc_lookup_ge(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	xfs_agblock_t		bno,	/* starting block of extent */
+	xfs_extlen_t		len,	/* length of extent */
+	int			*stat);	/* success/failure */
+
+int					/* error */
+xfs_alloc_get_rec(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	xfs_agblock_t		*bno,	/* output: starting block of extent */
+	xfs_extlen_t		*len,	/* output: length of extent */
+	int			*stat);	/* output: success/failure */
+
+union xfs_btree_rec;
+void xfs_alloc_btrec_to_irec(const union xfs_btree_rec *rec,
+		struct xfs_alloc_rec_incore *irec);
+xfs_failaddr_t xfs_alloc_check_irec(struct xfs_btree_cur *cur,
+		const struct xfs_alloc_rec_incore *irec);
+
+int xfs_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
+		struct xfs_buf **agfbpp);
+int xfs_alloc_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
+		struct xfs_buf **agfbpp);
+int xfs_alloc_read_agfl(struct xfs_perag *pag, struct xfs_trans *tp,
+		struct xfs_buf **bpp);
+int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t,
+			struct xfs_buf *, struct xfs_owner_info *);
+int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, uint32_t alloc_flags);
+int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag,
+		struct xfs_buf **agbp);
+
+xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
+
+typedef int (*xfs_alloc_query_range_fn)(
+	struct xfs_btree_cur			*cur,
+	const struct xfs_alloc_rec_incore	*rec,
+	void					*priv);
+
+int xfs_alloc_query_range(struct xfs_btree_cur *cur,
+		const struct xfs_alloc_rec_incore *low_rec,
+		const struct xfs_alloc_rec_incore *high_rec,
+		xfs_alloc_query_range_fn fn, void *priv);
+int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
+		void *priv);
+
+int xfs_alloc_has_records(struct xfs_btree_cur *cur, xfs_agblock_t bno,
+		xfs_extlen_t len, enum xbtree_recpacking *outcome);
+
+typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno,
+		void *priv);
+int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf,
+		struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv);
+
+static inline __be32 *
+xfs_buf_to_agfl_bno(
+	struct xfs_buf		*bp)
+{
+	if (xfs_has_crc(bp->b_mount))
+		return bp->b_addr + sizeof(struct xfs_agfl);
+	return bp->b_addr;
+}
+
+int __xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
+		xfs_filblks_t len, const struct xfs_owner_info *oinfo,
+		enum xfs_ag_resv_type type, bool skip_discard);
+
+/*
+ * List of extents to be free "later".
+ * The list is kept sorted on xbf_startblock.
+ */
+struct xfs_extent_free_item {
+	struct list_head	xefi_list;
+	uint64_t		xefi_owner;
+	xfs_fsblock_t		xefi_startblock;/* starting fs block number */
+	xfs_extlen_t		xefi_blockcount;/* number of blocks in extent */
+	struct xfs_perag	*xefi_pag;
+	unsigned int		xefi_flags;
+	enum xfs_ag_resv_type	xefi_agresv;
+};
+
+void xfs_extent_free_get_group(struct xfs_mount *mp,
+		struct xfs_extent_free_item *xefi);
+
+#define XFS_EFI_SKIP_DISCARD	(1U << 0) /* don't issue discard */
+#define XFS_EFI_ATTR_FORK	(1U << 1) /* freeing attr fork block */
+#define XFS_EFI_BMBT_BLOCK	(1U << 2) /* freeing bmap btree block */
+
+static inline int
+xfs_free_extent_later(
+	struct xfs_trans		*tp,
+	xfs_fsblock_t			bno,
+	xfs_filblks_t			len,
+	const struct xfs_owner_info	*oinfo,
+	enum xfs_ag_resv_type		type)
+{
+	return __xfs_free_extent_later(tp, bno, len, oinfo, type, false);
+}
+
+
+extern struct kmem_cache	*xfs_extfree_item_cache;
+
+int __init xfs_extfree_intent_init_cache(void);
+void xfs_extfree_intent_destroy_cache(void);
+
+xfs_failaddr_t xfs_validate_ag_length(struct xfs_buf *bp, uint32_t seqno,
+		uint32_t length);
+
+#endif	/* __XFS_ALLOC_H__ */