[linux-2.6-block.git] / fs / jfs / jfs_xtree.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *   Copyright (C) International Business Machines Corp., 2000-2002
 */
#ifndef _H_JFS_XTREE
#define _H_JFS_XTREE

/*
 *	jfs_xtree.h: extent allocation descriptor B+-tree manager
 */

#include "jfs_btree.h"


/*
 *	extent allocation descriptor (xad)
 */
typedef struct xad {
	__u8 flag;	/* 1: flag */
	__u8 rsvrd[2];	/* 2: reserved */
	__u8 off1;	/* 1: offset in unit of fsblksize */
	__le32 off2;	/* 4: offset in unit of fsblksize */
	pxd_t loc;	/* 8: length and address in unit of fsblksize */
} xad_t;			/* (16) */

#define MAXXLEN		((1 << 24) - 1)

#define XTSLOTSIZE	16
#define L2XTSLOTSIZE	4

/* xad_t field construction */
#define XADoffset(xad, offset64)\
{\
	(xad)->off1 = ((u64)offset64) >> 32;\
	(xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
}
#define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64)
#define XADlength(xad, length32) PXDlength(&(xad)->loc, length32)

/* xad_t field extraction */
#define offsetXAD(xad)\
	( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
#define addressXAD(xad) addressPXD(&(xad)->loc)
#define lengthXAD(xad) lengthPXD(&(xad)->loc)

/* xad list */
struct xadlist {
	s16 maxnxad;
	s16 nxad;
	xad_t *xad;
};

/* xad_t flags */
#define XAD_NEW		0x01	/* new */
#define XAD_EXTENDED	0x02	/* extended */
#define XAD_COMPRESSED	0x04	/* compressed with recorded length */
#define XAD_NOTRECORDED 0x08	/* allocated but not recorded */
#define XAD_COW		0x10	/* copy-on-write */


/* possible values for maxentry */
#define XTROOTINITSLOT_DIR 6
#define XTROOTINITSLOT	10
#define XTROOTMAXSLOT	18
#define XTPAGEMAXSLOT	256
#define XTENTRYSTART	2

struct xtheader {
	__le64 next;	/* 8: */
	__le64 prev;	/* 8: */

	u8 flag;	/* 1: */
	u8 rsrvd1;	/* 1: */
	__le16 nextindex;	/* 2: next index = number of entries */
	__le16 maxentry;	/* 2: max number of entries */
	__le16 rsrvd2;	/* 2: */

	pxd_t self;	/* 8: self */
};

/*
 *	xtree root (in inode):
 */
typedef union {
	struct xtheader header;
	xad_t xad[XTROOTMAXSLOT];	/* 16 * maxentry: xad array */
} xtroot_t;

/*
 *	xtree page:
 */
typedef union {
	struct xtheader header;
	xad_t xad[XTPAGEMAXSLOT];	/* 16 * maxentry: xad array */
} xtpage_t;

/*
 *	external declaration
 */
extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
		    int *pflag, s64 * paddr, int *plen, int flag);
extern void xtInitRoot(tid_t tid, struct inode *ip);
extern int xtInsert(tid_t tid, struct inode *ip,
		    int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
		    int flag);
extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
extern int xtAppend(tid_t tid,
		    struct inode *ip, int xflag, s64 xoff, int maxblocks,
		    int *xlenp, s64 * xaddrp, int flag);
#endif				/* !_H_JFS_XTREE */
Commit	Line	Data
1a59d1b8	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4	2	/*
63f83c9f	3	* Copyright (C) International Business Machines Corp., 2000-2002
1da177e4 LT	4	*/
	5	#ifndef _H_JFS_XTREE
	6	#define _H_JFS_XTREE
	7
	8	/*
f720e3ba	9	* jfs_xtree.h: extent allocation descriptor B+-tree manager
1da177e4 LT	10	*/
	11
	12	#include "jfs_btree.h"
	13
	14
	15	/*
f720e3ba	16	* extent allocation descriptor (xad)
1da177e4 LT	17	*/
1da177e4 LT	18	typedef struct xad {
e1f1fe79 AV	19	__u8 flag; /* 1: flag */
	20	__u8 rsvrd[2]; /* 2: reserved */
	21	__u8 off1; /* 1: offset in unit of fsblksize */
	22	__le32 off2; /* 4: offset in unit of fsblksize */
	23	pxd_t loc; /* 8: length and address in unit of fsblksize */
1da177e4 LT	24	} xad_t; /* (16) */
1da177e4 LT	25
f720e3ba	26	#define MAXXLEN ((1 << 24) - 1)
1da177e4	27
f720e3ba DK	28	#define XTSLOTSIZE 16
f720e3ba DK	29	#define L2XTSLOTSIZE 4
1da177e4 LT	30
	31	/* xad_t field construction */
	32	#define XADoffset(xad, offset64)\
	33	{\
f720e3ba DK	34	(xad)->off1 = ((u64)offset64) >> 32;\
f720e3ba DK	35	(xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
1da177e4	36	}
e1f1fe79 AV	37	#define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64)
e1f1fe79 AV	38	#define XADlength(xad, length32) PXDlength(&(xad)->loc, length32)
1da177e4 LT	39
	40	/* xad_t field extraction */
	41	#define offsetXAD(xad)\
f720e3ba	42	( ((s64)((xad)->off1)) << 32 \| __le32_to_cpu((xad)->off2))
e1f1fe79 AV	43	#define addressXAD(xad) addressPXD(&(xad)->loc)
e1f1fe79 AV	44	#define lengthXAD(xad) lengthPXD(&(xad)->loc)
1da177e4 LT	45
	46	/* xad list */
	47	struct xadlist {
	48	s16 maxnxad;
	49	s16 nxad;
	50	xad_t *xad;
	51	};
	52
	53	/* xad_t flags */
f720e3ba DK	54	#define XAD_NEW 0x01 /* new */
	55	#define XAD_EXTENDED 0x02 /* extended */
	56	#define XAD_COMPRESSED 0x04 /* compressed with recorded length */
1da177e4	57	#define XAD_NOTRECORDED 0x08 /* allocated but not recorded */
f720e3ba	58	#define XAD_COW 0x10 /* copy-on-write */
1da177e4 LT	59
	60
	61	/* possible values for maxentry */
f720e3ba DK	62	#define XTROOTINITSLOT_DIR 6
	63	#define XTROOTINITSLOT 10
	64	#define XTROOTMAXSLOT 18
	65	#define XTPAGEMAXSLOT 256
	66	#define XTENTRYSTART 2
1da177e4	67
a779ed75 DK	68	struct xtheader {
	69	__le64 next; /* 8: */
	70	__le64 prev; /* 8: */
1da177e4	71
a779ed75 DK	72	u8 flag; /* 1: */
	73	u8 rsrvd1; /* 1: */
	74	__le16 nextindex; /* 2: next index = number of entries */
	75	__le16 maxentry; /* 2: max number of entries */
	76	__le16 rsrvd2; /* 2: */
1da177e4	77
a779ed75 DK	78	pxd_t self; /* 8: self */
a779ed75 DK	79	};
1da177e4	80
a779ed75 DK	81	/*
	82	* xtree root (in inode):
	83	*/
	84	typedef union {
	85	struct xtheader header;
1da177e4	86	xad_t xad[XTROOTMAXSLOT]; /* 16 * maxentry: xad array */
a779ed75 DK	87	} xtroot_t;
	88
	89	/*
	90	* xtree page:
	91	*/
	92	typedef union {
	93	struct xtheader header;
	94	xad_t xad[XTPAGEMAXSLOT]; /* 16 * maxentry: xad array */
1da177e4 LT	95	} xtpage_t;
	96
	97	/*
f720e3ba	98	* external declaration
1da177e4 LT	99	*/
	100	extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
	101	int pflag, s64 paddr, int *plen, int flag);
1da177e4 LT	102	extern void xtInitRoot(tid_t tid, struct inode *ip);
	103	extern int xtInsert(tid_t tid, struct inode *ip,
	104	int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
	105	extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
	106	int flag);
1da177e4	107	extern int xtUpdate(tid_t tid, struct inode ip, struct xad nxad);
1da177e4 LT	108	extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
1da177e4 LT	109	extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
1da177e4 LT	110	extern int xtAppend(tid_t tid,
	111	struct inode *ip, int xflag, s64 xoff, int maxblocks,
	112	int xlenp, s64 xaddrp, int flag);
1da177e4	113	#endif /* !_H_JFS_XTREE */