linux/fs/xfs/xfs_trans.h

/*
 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * 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.
 *
 * 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_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_log_item_desc;
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_defer_ops;
struct xfs_bui_log_item;
struct xfs_bud_log_item;

typedef struct xfs_log_item {
	struct list_head		li_ail;		/* AIL pointers */
	xfs_lsn_t			li_lsn;		/* last on-disk lsn */
	struct xfs_log_item_desc	*li_desc;	/* ptr to current desc*/
	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 */
	void				(*li_cb)(struct xfs_buf *,
						 struct xfs_log_item *);
							/* buffer item iodone */
							/* callback func */
	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_lsn_t			li_seq;		/* CIL commit seq */
} xfs_log_item_t;

/*
 * 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_FLAGS \
	{ (1 << XFS_LI_IN_AIL),		"IN_AIL" }, \
	{ (1 << XFS_LI_ABORTED),	"ABORTED" }, \
	{ (1 << XFS_LI_FAILED),		"FAILED" }

struct xfs_item_ops {
	void (*iop_size)(xfs_log_item_t *, int *, int *);
	void (*iop_format)(xfs_log_item_t *, struct xfs_log_vec *);
	void (*iop_pin)(xfs_log_item_t *);
	void (*iop_unpin)(xfs_log_item_t *, int remove);
	uint (*iop_push)(struct xfs_log_item *, struct list_head *);
	void (*iop_unlock)(xfs_log_item_t *);
	xfs_lsn_t (*iop_committed)(xfs_log_item_t *, xfs_lsn_t);
	void (*iop_committing)(xfs_log_item_t *, xfs_lsn_t);
	void (*iop_error)(xfs_log_item_t *, xfs_buf_t *);
};

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


/*
 * 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 */
	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 */
	struct xfs_defer_ops	*t_agfl_dfops;	/* optional agfl fixup dfops */
	unsigned int		t_flags;	/* misc flags */
	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 */
#if defined(DEBUG) || defined(XFS_WARN)
	int64_t			t_ag_freeblks_delta; /* debugging counter */
	int64_t			t_ag_flist_delta; /* debugging counter */
	int64_t			t_ag_btree_delta; /* debugging counter */
#endif
	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 */
	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)

#if defined(DEBUG) || defined(XFS_WARN)
#define	xfs_trans_agblocks_delta(tp, d)	((tp)->t_ag_freeblks_delta += (int64_t)d)
#define	xfs_trans_agflist_delta(tp, d)	((tp)->t_ag_flist_delta += (int64_t)d)
#define	xfs_trans_agbtree_delta(tp, d)	((tp)->t_ag_btree_delta += (int64_t)d)
#else
#define	xfs_trans_agblocks_delta(tp, d)
#define	xfs_trans_agflist_delta(tp, d)
#define	xfs_trans_agbtree_delta(tp, d)
#endif

/*
 * 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);

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

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

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(xfs_trans_t *, struct xfs_mount *, int);

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 *);
void		xfs_trans_log_inode(xfs_trans_t *, struct xfs_inode *, uint);

void		xfs_extent_free_init_defer_op(void);
struct xfs_efd_log_item	*xfs_trans_get_efd(struct xfs_trans *,
				  struct xfs_efi_log_item *,
				  uint);
int		xfs_trans_free_extent(struct xfs_trans *,
				      struct xfs_efd_log_item *, xfs_fsblock_t,
				      xfs_extlen_t, struct xfs_owner_info *);
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;
extern kmem_zone_t	*xfs_log_item_desc_zone;

/* rmap updates */
enum xfs_rmap_intent_type;

void xfs_rmap_update_init_defer_op(void);
struct xfs_rud_log_item *xfs_trans_get_rud(struct xfs_trans *tp,
		struct xfs_rui_log_item *ruip);
int xfs_trans_log_finish_rmap_update(struct xfs_trans *tp,
		struct xfs_rud_log_item *rudp, 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);

/* refcount updates */
enum xfs_refcount_intent_type;

void xfs_refcount_update_init_defer_op(void);
struct xfs_cud_log_item *xfs_trans_get_cud(struct xfs_trans *tp,
		struct xfs_cui_log_item *cuip);
int xfs_trans_log_finish_refcount_update(struct xfs_trans *tp,
		struct xfs_cud_log_item *cudp, struct xfs_defer_ops *dfops,
		enum xfs_refcount_intent_type type, xfs_fsblock_t startblock,
		xfs_extlen_t blockcount, xfs_fsblock_t *new_fsb,
		xfs_extlen_t *new_len, struct xfs_btree_cur **pcur);

/* mapping updates */
enum xfs_bmap_intent_type;

void xfs_bmap_update_init_defer_op(void);
struct xfs_bud_log_item *xfs_trans_get_bud(struct xfs_trans *tp,
		struct xfs_bui_log_item *buip);
int xfs_trans_log_finish_bmap_update(struct xfs_trans *tp,
		struct xfs_bud_log_item *rudp, struct xfs_defer_ops *dfops,
		enum xfs_bmap_intent_type type, struct xfs_inode *ip,
		int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock,
		xfs_filblks_t *blockcount, xfs_exntst_t state);

#endif	/* __XFS_TRANS_H__ */