fs/xfs/xfs_trans.h - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
  * All Rights Reserved.
  */
 #ifndef	__XFS_TRANS_H__
 #define	__XFS_TRANS_H__

 /* kernel only transaction subsystem defines */

 struct xfs_buf;
 struct xfs_buftarg;
 struct xfs_efd_log_item;
 struct xfs_efi_log_item;
 struct xfs_inode;
 struct xfs_item_ops;
 struct xfs_log_iovec;
 struct xfs_mount;
 struct xfs_trans;
 struct xfs_trans_res;
 struct xfs_dquot_acct;
 struct xfs_rud_log_item;
 struct xfs_rui_log_item;
 struct xfs_btree_cur;
 struct xfs_cui_log_item;
 struct xfs_cud_log_item;
 struct xfs_bui_log_item;
 struct xfs_bud_log_item;

 struct xfs_log_item {
 	struct list_head		li_ail;		/* AIL pointers */
 	struct list_head		li_trans;	/* transaction list */
 	xfs_lsn_t			li_lsn;		/* last on-disk lsn */
 	struct xfs_mount		*li_mountp;	/* ptr to fs mount */
 	struct xfs_ail			*li_ailp;	/* ptr to AIL */
 	uint				li_type;	/* item type */
 	unsigned long			li_flags;	/* misc flags */
 	struct xfs_buf			*li_buf;	/* real buffer pointer */
 	struct list_head		li_bio_list;	/* buffer item list */
 	const struct xfs_item_ops	*li_ops;	/* function list */

 	/* delayed logging */
 	struct list_head		li_cil;		/* CIL pointers */
 	struct xfs_log_vec		*li_lv;		/* active log vector */
 	struct xfs_log_vec		*li_lv_shadow;	/* standby vector */
 	xfs_csn_t			li_seq;		/* CIL commit seq */
 };

 /*
  * li_flags use the (set/test/clear)_bit atomic interfaces because updates can
  * race with each other and we don't want to have to use the AIL lock to
  * serialise all updates.
  */
 #define	XFS_LI_IN_AIL	0
 #define	XFS_LI_ABORTED	1
 #define	XFS_LI_FAILED	2
 #define	XFS_LI_DIRTY	3	/* log item dirty in transaction */

 #define XFS_LI_FLAGS \
 	{ (1 << XFS_LI_IN_AIL),		"IN_AIL" }, \
 	{ (1 << XFS_LI_ABORTED),	"ABORTED" }, \
 	{ (1 << XFS_LI_FAILED),		"FAILED" }, \
 	{ (1 << XFS_LI_DIRTY),		"DIRTY" }

 struct xfs_item_ops {
 	unsigned flags;
 	void (*iop_size)(struct xfs_log_item *, int *, int *);
 	void (*iop_format)(struct xfs_log_item *, struct xfs_log_vec *);
 	void (*iop_pin)(struct xfs_log_item *);
 	void (*iop_unpin)(struct xfs_log_item *, int remove);
 	uint (*iop_push)(struct xfs_log_item *, struct list_head *);
 	void (*iop_committing)(struct xfs_log_item *lip, xfs_csn_t seq);
 	void (*iop_release)(struct xfs_log_item *);
 	xfs_lsn_t (*iop_committed)(struct xfs_log_item *, xfs_lsn_t);
 	int (*iop_recover)(struct xfs_log_item *lip,
 			   struct list_head *capture_list);
 	bool (*iop_match)(struct xfs_log_item *item, uint64_t id);
 	struct xfs_log_item *(*iop_relog)(struct xfs_log_item *intent,
 			struct xfs_trans *tp);
 };

 /* Is this log item a deferred action intent? */
 static inline bool
 xlog_item_is_intent(struct xfs_log_item *lip)
 {
 	return lip->li_ops->iop_recover != NULL &&
 	       lip->li_ops->iop_match != NULL;
 }

 /* Is this a log intent-done item? */
 static inline bool
 xlog_item_is_intent_done(struct xfs_log_item *lip)
 {
 	return lip->li_ops->iop_unpin == NULL &&
 	       lip->li_ops->iop_push == NULL;
 }

 /*
  * Release the log item as soon as committed.  This is for items just logging
  * intents that never need to be written back in place.
  */
 #define XFS_ITEM_RELEASE_WHEN_COMMITTED	(1 << 0)

 void	xfs_log_item_init(struct xfs_mount *mp, struct xfs_log_item *item,
 			  int type, const struct xfs_item_ops *ops);

 /*
  * Return values for the iop_push() routines.
  */
 #define XFS_ITEM_SUCCESS	0
 #define XFS_ITEM_PINNED		1
 #define XFS_ITEM_LOCKED		2
 #define XFS_ITEM_FLUSHING	3

 /*
  * Deferred operation item relogging limits.
  */
 #define XFS_DEFER_OPS_NR_INODES	2	/* join up to two inodes */
 #define XFS_DEFER_OPS_NR_BUFS	2	/* join up to two buffers */

 /*
  * This is the structure maintained for every active transaction.
  */
 typedef struct xfs_trans {
 	unsigned int		t_magic;	/* magic number */
 	unsigned int		t_log_res;	/* amt of log space resvd */
 	unsigned int		t_log_count;	/* count for perm log res */
 	unsigned int		t_blk_res;	/* # of blocks resvd */
 	unsigned int		t_blk_res_used;	/* # of resvd blocks used */
 	unsigned int		t_rtx_res;	/* # of rt extents resvd */
 	unsigned int		t_rtx_res_used;	/* # of resvd rt extents used */
 	unsigned int		t_flags;	/* misc flags */
 	xfs_fsblock_t		t_firstblock;	/* first block allocated */
 	struct xlog_ticket	*t_ticket;	/* log mgr ticket */
 	struct xfs_mount	*t_mountp;	/* ptr to fs mount struct */
 	struct xfs_dquot_acct   *t_dqinfo;	/* acctg info for dquots */
 	int64_t			t_icount_delta;	/* superblock icount change */
 	int64_t			t_ifree_delta;	/* superblock ifree change */
 	int64_t			t_fdblocks_delta; /* superblock fdblocks chg */
 	int64_t			t_res_fdblocks_delta; /* on-disk only chg */
 	int64_t			t_frextents_delta;/* superblock freextents chg*/
 	int64_t			t_res_frextents_delta; /* on-disk only chg */
 	int64_t			t_dblocks_delta;/* superblock dblocks change */
 	int64_t			t_agcount_delta;/* superblock agcount change */
 	int64_t			t_imaxpct_delta;/* superblock imaxpct change */
 	int64_t			t_rextsize_delta;/* superblock rextsize chg */
 	int64_t			t_rbmblocks_delta;/* superblock rbmblocks chg */
 	int64_t			t_rblocks_delta;/* superblock rblocks change */
 	int64_t			t_rextents_delta;/* superblocks rextents chg */
 	int64_t			t_rextslog_delta;/* superblocks rextslog chg */
 	struct list_head	t_items;	/* log item descriptors */
 	struct list_head	t_busy;		/* list of busy extents */
 	struct list_head	t_dfops;	/* deferred operations */
 	unsigned long		t_pflags;	/* saved process flags state */
 } xfs_trans_t;

 /*
  * XFS transaction mechanism exported interfaces that are
  * actually macros.
  */
 #define	xfs_trans_set_sync(tp)		((tp)->t_flags |= XFS_TRANS_SYNC)

 /*
  * XFS transaction mechanism exported interfaces.
  */
 int		xfs_trans_alloc(struct xfs_mount *mp, struct xfs_trans_res *resp,
 			uint blocks, uint rtextents, uint flags,
 			struct xfs_trans **tpp);
 int		xfs_trans_alloc_empty(struct xfs_mount *mp,
 			struct xfs_trans **tpp);
 void		xfs_trans_mod_sb(xfs_trans_t *, uint, int64_t);

 int xfs_trans_get_buf_map(struct xfs_trans *tp, struct xfs_buftarg *target,
 		struct xfs_buf_map *map, int nmaps, xfs_buf_flags_t flags,
 		struct xfs_buf **bpp);

 static inline int
 xfs_trans_get_buf(
 	struct xfs_trans	*tp,
 	struct xfs_buftarg	*target,
 	xfs_daddr_t		blkno,
 	int			numblks,
 	uint			flags,
 	struct xfs_buf		**bpp)
 {
 	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
 	return xfs_trans_get_buf_map(tp, target, &map, 1, flags, bpp);
 }

 int		xfs_trans_read_buf_map(struct xfs_mount *mp,
 				       struct xfs_trans *tp,
 				       struct xfs_buftarg *target,
 				       struct xfs_buf_map *map, int nmaps,
 				       xfs_buf_flags_t flags,
 				       struct xfs_buf **bpp,
 				       const struct xfs_buf_ops *ops);

 static inline int
 xfs_trans_read_buf(
 	struct xfs_mount	*mp,
 	struct xfs_trans	*tp,
 	struct xfs_buftarg	*target,
 	xfs_daddr_t		blkno,
 	int			numblks,
 	xfs_buf_flags_t		flags,
 	struct xfs_buf		**bpp,
 	const struct xfs_buf_ops *ops)
 {
 	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
 	return xfs_trans_read_buf_map(mp, tp, target, &map, 1,
 				      flags, bpp, ops);
 }

 struct xfs_buf	*xfs_trans_getsb(struct xfs_trans *);

 void		xfs_trans_brelse(xfs_trans_t *, struct xfs_buf *);
 void		xfs_trans_bjoin(xfs_trans_t *, struct xfs_buf *);
 void		xfs_trans_bhold(xfs_trans_t *, struct xfs_buf *);
 void		xfs_trans_bhold_release(xfs_trans_t *, struct xfs_buf *);
 void		xfs_trans_binval(xfs_trans_t *, struct xfs_buf *);
 void		xfs_trans_inode_buf(xfs_trans_t *, struct xfs_buf *);
 void		xfs_trans_stale_inode_buf(xfs_trans_t *, struct xfs_buf *);
 bool		xfs_trans_ordered_buf(xfs_trans_t *, struct xfs_buf *);
 void		xfs_trans_dquot_buf(xfs_trans_t *, struct xfs_buf *, uint);
 void		xfs_trans_inode_alloc_buf(xfs_trans_t *, struct xfs_buf *);
 void		xfs_trans_ichgtime(struct xfs_trans *, struct xfs_inode *, int);
 void		xfs_trans_ijoin(struct xfs_trans *, struct xfs_inode *, uint);
 void		xfs_trans_log_buf(struct xfs_trans *, struct xfs_buf *, uint,
 				  uint);
 void		xfs_trans_dirty_buf(struct xfs_trans *, struct xfs_buf *);
 bool		xfs_trans_buf_is_dirty(struct xfs_buf *bp);
 void		xfs_trans_log_inode(xfs_trans_t *, struct xfs_inode *, uint);

 int		xfs_trans_commit(struct xfs_trans *);
 int		xfs_trans_roll(struct xfs_trans **);
 int		xfs_trans_roll_inode(struct xfs_trans **, struct xfs_inode *);
 void		xfs_trans_cancel(xfs_trans_t *);
 int		xfs_trans_ail_init(struct xfs_mount *);
 void		xfs_trans_ail_destroy(struct xfs_mount *);

 void		xfs_trans_buf_set_type(struct xfs_trans *, struct xfs_buf *,
 				       enum xfs_blft);
 void		xfs_trans_buf_copy_type(struct xfs_buf *dst_bp,
 					struct xfs_buf *src_bp);

 extern kmem_zone_t	*xfs_trans_zone;

 static inline struct xfs_log_item *
 xfs_trans_item_relog(
 	struct xfs_log_item	*lip,
 	struct xfs_trans	*tp)
 {
 	return lip->li_ops->iop_relog(lip, tp);
 }

 struct xfs_dquot;

 int xfs_trans_alloc_inode(struct xfs_inode *ip, struct xfs_trans_res *resv,
 		unsigned int dblocks, unsigned int rblocks, bool force,
 		struct xfs_trans **tpp);
 int xfs_trans_alloc_icreate(struct xfs_mount *mp, struct xfs_trans_res *resv,
 		struct xfs_dquot *udqp, struct xfs_dquot *gdqp,
 		struct xfs_dquot *pdqp, unsigned int dblocks,
 		struct xfs_trans **tpp);
 int xfs_trans_alloc_ichange(struct xfs_inode *ip, struct xfs_dquot *udqp,
 		struct xfs_dquot *gdqp, struct xfs_dquot *pdqp, bool force,
 		struct xfs_trans **tpp);
 int xfs_trans_alloc_dir(struct xfs_inode *dp, struct xfs_trans_res *resv,
 		struct xfs_inode *ip, unsigned int *dblocks,
 		struct xfs_trans **tpp, int *nospace_error);

 static inline void
 xfs_trans_set_context(
 	struct xfs_trans	*tp)
 {
 	ASSERT(current->journal_info == NULL);
 	tp->t_pflags = memalloc_nofs_save();
 	current->journal_info = tp;
 }

 static inline void
 xfs_trans_clear_context(
 	struct xfs_trans	*tp)
 {
 	if (current->journal_info == tp) {
 		memalloc_nofs_restore(tp->t_pflags);
 		current->journal_info = NULL;
 	}
 }

 static inline void
 xfs_trans_switch_context(
 	struct xfs_trans	*old_tp,
 	struct xfs_trans	*new_tp)
 {
 	ASSERT(current->journal_info == old_tp);
 	new_tp->t_pflags = old_tp->t_pflags;
 	old_tp->t_pflags = 0;
 	current->journal_info = new_tp;
 }

 #endif	/* __XFS_TRANS_H__ */
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
	* All Rights Reserved.
	*/
	#ifndef __XFS_TRANS_H__
	#define __XFS_TRANS_H__

	/* kernel only transaction subsystem defines */

	struct xfs_buf;
	struct xfs_buftarg;
	struct xfs_efd_log_item;
	struct xfs_efi_log_item;
	struct xfs_inode;
	struct xfs_item_ops;
	struct xfs_log_iovec;
	struct xfs_mount;
	struct xfs_trans;
	struct xfs_trans_res;
	struct xfs_dquot_acct;
	struct xfs_rud_log_item;
	struct xfs_rui_log_item;
	struct xfs_btree_cur;
	struct xfs_cui_log_item;
	struct xfs_cud_log_item;
	struct xfs_bui_log_item;
	struct xfs_bud_log_item;

	struct xfs_log_item {
	struct list_head li_ail; /* AIL pointers */
	struct list_head li_trans; /* transaction list */
	xfs_lsn_t li_lsn; /* last on-disk lsn */
	struct xfs_mount li_mountp; / ptr to fs mount */
	struct xfs_ail li_ailp; / ptr to AIL */
	uint li_type; /* item type */
	unsigned long li_flags; /* misc flags */
	struct xfs_buf li_buf; / real buffer pointer */
	struct list_head li_bio_list; /* buffer item list */
	const struct xfs_item_ops li_ops; / function list */

	/* delayed logging */
	struct list_head li_cil; /* CIL pointers */
	struct xfs_log_vec li_lv; / active log vector */
	struct xfs_log_vec li_lv_shadow; / standby vector */
	xfs_csn_t li_seq; /* CIL commit seq */
	};

	/*
	* li_flags use the (set/test/clear)_bit atomic interfaces because updates can
	* race with each other and we don't want to have to use the AIL lock to
	* serialise all updates.
	*/
	#define XFS_LI_IN_AIL 0
	#define XFS_LI_ABORTED 1
	#define XFS_LI_FAILED 2
	#define XFS_LI_DIRTY 3 /* log item dirty in transaction */

	#define XFS_LI_FLAGS \
	{ (1 << XFS_LI_IN_AIL), "IN_AIL" }, \
	{ (1 << XFS_LI_ABORTED), "ABORTED" }, \
	{ (1 << XFS_LI_FAILED), "FAILED" }, \
	{ (1 << XFS_LI_DIRTY), "DIRTY" }

	struct xfs_item_ops {
	unsigned flags;
	void (iop_size)(struct xfs_log_item , int , int );
	void (iop_format)(struct xfs_log_item , struct xfs_log_vec *);
	void (iop_pin)(struct xfs_log_item );
	void (iop_unpin)(struct xfs_log_item , int remove);
	uint (iop_push)(struct xfs_log_item , struct list_head *);
	void (iop_committing)(struct xfs_log_item lip, xfs_csn_t seq);
	void (iop_release)(struct xfs_log_item );
	xfs_lsn_t (iop_committed)(struct xfs_log_item , xfs_lsn_t);
	int (iop_recover)(struct xfs_log_item lip,
	struct list_head *capture_list);
	bool (iop_match)(struct xfs_log_item item, uint64_t id);
	struct xfs_log_item (iop_relog)(struct xfs_log_item *intent,
	struct xfs_trans *tp);
	};

	/* Is this log item a deferred action intent? */
	static inline bool
	xlog_item_is_intent(struct xfs_log_item *lip)
	{
	return lip->li_ops->iop_recover != NULL &&
	lip->li_ops->iop_match != NULL;
	}

	/* Is this a log intent-done item? */
	static inline bool
	xlog_item_is_intent_done(struct xfs_log_item *lip)
	{
	return lip->li_ops->iop_unpin == NULL &&
	lip->li_ops->iop_push == NULL;
	}

	/*
	* Release the log item as soon as committed. This is for items just logging
	* intents that never need to be written back in place.
	*/
	#define XFS_ITEM_RELEASE_WHEN_COMMITTED (1 << 0)

	void xfs_log_item_init(struct xfs_mount mp, struct xfs_log_item item,
	int type, const struct xfs_item_ops *ops);

	/*
	* Return values for the iop_push() routines.
	*/
	#define XFS_ITEM_SUCCESS 0
	#define XFS_ITEM_PINNED 1
	#define XFS_ITEM_LOCKED 2
	#define XFS_ITEM_FLUSHING 3

	/*
	* Deferred operation item relogging limits.
	*/
	#define XFS_DEFER_OPS_NR_INODES 2 /* join up to two inodes */
	#define XFS_DEFER_OPS_NR_BUFS 2 /* join up to two buffers */

	/*
	* This is the structure maintained for every active transaction.
	*/
	typedef struct xfs_trans {
	unsigned int t_magic; /* magic number */
	unsigned int t_log_res; /* amt of log space resvd */
	unsigned int t_log_count; /* count for perm log res */
	unsigned int t_blk_res; /* # of blocks resvd */
	unsigned int t_blk_res_used; /* # of resvd blocks used */
	unsigned int t_rtx_res; /* # of rt extents resvd */
	unsigned int t_rtx_res_used; /* # of resvd rt extents used */
	unsigned int t_flags; /* misc flags */
	xfs_fsblock_t t_firstblock; /* first block allocated */
	struct xlog_ticket t_ticket; / log mgr ticket */
	struct xfs_mount t_mountp; / ptr to fs mount struct */
	struct xfs_dquot_acct t_dqinfo; / acctg info for dquots */
	int64_t t_icount_delta; /* superblock icount change */
	int64_t t_ifree_delta; /* superblock ifree change */
	int64_t t_fdblocks_delta; /* superblock fdblocks chg */
	int64_t t_res_fdblocks_delta; /* on-disk only chg */
	int64_t t_frextents_delta;/* superblock freextents chg*/
	int64_t t_res_frextents_delta; /* on-disk only chg */
	int64_t t_dblocks_delta;/* superblock dblocks change */
	int64_t t_agcount_delta;/* superblock agcount change */
	int64_t t_imaxpct_delta;/* superblock imaxpct change */
	int64_t t_rextsize_delta;/* superblock rextsize chg */
	int64_t t_rbmblocks_delta;/* superblock rbmblocks chg */
	int64_t t_rblocks_delta;/* superblock rblocks change */
	int64_t t_rextents_delta;/* superblocks rextents chg */
	int64_t t_rextslog_delta;/* superblocks rextslog chg */
	struct list_head t_items; /* log item descriptors */
	struct list_head t_busy; /* list of busy extents */
	struct list_head t_dfops; /* deferred operations */
	unsigned long t_pflags; /* saved process flags state */
	} xfs_trans_t;

	/*
	* XFS transaction mechanism exported interfaces that are
	* actually macros.
	*/
	#define xfs_trans_set_sync(tp) ((tp)->t_flags \|= XFS_TRANS_SYNC)

	/*
	* XFS transaction mechanism exported interfaces.
	*/
	int xfs_trans_alloc(struct xfs_mount mp, struct xfs_trans_res resp,
	uint blocks, uint rtextents, uint flags,
	struct xfs_trans **tpp);
	int xfs_trans_alloc_empty(struct xfs_mount *mp,
	struct xfs_trans **tpp);
	void xfs_trans_mod_sb(xfs_trans_t *, uint, int64_t);

	int xfs_trans_get_buf_map(struct xfs_trans tp, struct xfs_buftarg target,
	struct xfs_buf_map *map, int nmaps, xfs_buf_flags_t flags,
	struct xfs_buf **bpp);

	static inline int
	xfs_trans_get_buf(
	struct xfs_trans *tp,
	struct xfs_buftarg *target,
	xfs_daddr_t blkno,
	int numblks,
	uint flags,
	struct xfs_buf **bpp)
	{
	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
	return xfs_trans_get_buf_map(tp, target, &map, 1, flags, bpp);
	}

	int xfs_trans_read_buf_map(struct xfs_mount *mp,
	struct xfs_trans *tp,
	struct xfs_buftarg *target,
	struct xfs_buf_map *map, int nmaps,
	xfs_buf_flags_t flags,
	struct xfs_buf **bpp,
	const struct xfs_buf_ops *ops);

	static inline int
	xfs_trans_read_buf(
	struct xfs_mount *mp,
	struct xfs_trans *tp,
	struct xfs_buftarg *target,
	xfs_daddr_t blkno,
	int numblks,
	xfs_buf_flags_t flags,
	struct xfs_buf **bpp,
	const struct xfs_buf_ops *ops)
	{
	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
	return xfs_trans_read_buf_map(mp, tp, target, &map, 1,
	flags, bpp, ops);
	}

	struct xfs_buf xfs_trans_getsb(struct xfs_trans );

	void xfs_trans_brelse(xfs_trans_t , struct xfs_buf );
	void xfs_trans_bjoin(xfs_trans_t , struct xfs_buf );
	void xfs_trans_bhold(xfs_trans_t , struct xfs_buf );
	void xfs_trans_bhold_release(xfs_trans_t , struct xfs_buf );
	void xfs_trans_binval(xfs_trans_t , struct xfs_buf );
	void xfs_trans_inode_buf(xfs_trans_t , struct xfs_buf );
	void xfs_trans_stale_inode_buf(xfs_trans_t , struct xfs_buf );
	bool xfs_trans_ordered_buf(xfs_trans_t , struct xfs_buf );
	void xfs_trans_dquot_buf(xfs_trans_t , struct xfs_buf , uint);
	void xfs_trans_inode_alloc_buf(xfs_trans_t , struct xfs_buf );
	void xfs_trans_ichgtime(struct xfs_trans , struct xfs_inode , int);
	void xfs_trans_ijoin(struct xfs_trans , struct xfs_inode , uint);
	void xfs_trans_log_buf(struct xfs_trans , struct xfs_buf , uint,
	uint);
	void xfs_trans_dirty_buf(struct xfs_trans , struct xfs_buf );
	bool xfs_trans_buf_is_dirty(struct xfs_buf *bp);
	void xfs_trans_log_inode(xfs_trans_t , struct xfs_inode , uint);

	int xfs_trans_commit(struct xfs_trans *);
	int xfs_trans_roll(struct xfs_trans **);
	int xfs_trans_roll_inode(struct xfs_trans *, struct xfs_inode );
	void xfs_trans_cancel(xfs_trans_t *);
	int xfs_trans_ail_init(struct xfs_mount *);
	void xfs_trans_ail_destroy(struct xfs_mount *);

	void xfs_trans_buf_set_type(struct xfs_trans , struct xfs_buf ,
	enum xfs_blft);
	void xfs_trans_buf_copy_type(struct xfs_buf *dst_bp,
	struct xfs_buf *src_bp);

	extern kmem_zone_t *xfs_trans_zone;

	static inline struct xfs_log_item *
	xfs_trans_item_relog(
	struct xfs_log_item *lip,
	struct xfs_trans *tp)
	{
	return lip->li_ops->iop_relog(lip, tp);
	}

	struct xfs_dquot;

	int xfs_trans_alloc_inode(struct xfs_inode ip, struct xfs_trans_res resv,
	unsigned int dblocks, unsigned int rblocks, bool force,
	struct xfs_trans **tpp);
	int xfs_trans_alloc_icreate(struct xfs_mount mp, struct xfs_trans_res resv,
	struct xfs_dquot udqp, struct xfs_dquot gdqp,
	struct xfs_dquot *pdqp, unsigned int dblocks,
	struct xfs_trans **tpp);
	int xfs_trans_alloc_ichange(struct xfs_inode ip, struct xfs_dquot udqp,
	struct xfs_dquot gdqp, struct xfs_dquot pdqp, bool force,
	struct xfs_trans **tpp);
	int xfs_trans_alloc_dir(struct xfs_inode dp, struct xfs_trans_res resv,
	struct xfs_inode ip, unsigned int dblocks,
	struct xfs_trans *tpp, int nospace_error);

	static inline void
	xfs_trans_set_context(
	struct xfs_trans *tp)
	{
	ASSERT(current->journal_info == NULL);
	tp->t_pflags = memalloc_nofs_save();
	current->journal_info = tp;
	}

	static inline void
	xfs_trans_clear_context(
	struct xfs_trans *tp)
	{
	if (current->journal_info == tp) {
	memalloc_nofs_restore(tp->t_pflags);
	current->journal_info = NULL;
	}
	}

	static inline void
	xfs_trans_switch_context(
	struct xfs_trans *old_tp,
	struct xfs_trans *new_tp)
	{
	ASSERT(current->journal_info == old_tp);
	new_tp->t_pflags = old_tp->t_pflags;
	old_tp->t_pflags = 0;
	current->journal_info = new_tp;
	}

	#endif /* __XFS_TRANS_H__ */