fs/jfs/jfs_dmap.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3  *   Copyright (C) International Business Machines Corp., 2000-2002
12 #define	LEAFIND		(64+16+4+1)	/* index of 1st leaf of a dmap tree */
24 #define	ROOT		0	/* index of the root of a tree */
25 #define	NOFREE		((s8) -1)	/* no blocks free */
66  *	- the number of dmaps preceding it
67  *	- the number of L0 pages preceding its L0 page
68  *	- the number of L1 pages preceding its L1 page
69  *	- 3 is added to account for the L2, L1, and L0 page for this dmap
70  *	- 1 is added to account for the control page of the map.
81  *	- the number of dmap pages preceding it
82  *	- the number of L0 pages preceding it
83  *	- the number of L1 pages preceding its L1 page
84  *	- 2 is added to account for the L2, and L1 page for this L0
85  *	- 1 is added to account for the control page of the map.
96  *	- the number of dmap pages preceding it
97  *	- the number of L0 pages preceding it
98  *	- the number of L1 pages preceding it
99  *	- 1 is added to account for the L2 page
100  *	- 1 is added to account for the control page of the map.
119 /* convert disk block number to allocation group number.
121 #define BLKTOAG(b,sbi)	((b) >> ((sbi)->bmap->db_agl2size))
123 /* convert allocation group number to starting disk block
127 	((s64)(a) << (JFS_SBI((ip)->i_sb)->bmap->db_agl2size))
137 	__le32 leafidx;		/* 4: index of first tree leaf	*/
142 };				/* - 360 -			*/
153 	__le32 wmap[LPERDMAP];	/* 1024: bits of the working map	*/
154 	__le32 pmap[LPERDMAP];	/* 1024: bits of the persistent map	*/
155 };				/* - 4096 -				*/
165 	__le32 leafidx;		/* 4: index of the first tree leaf	*/
170 };				/* - 4096 -			*/
189  *	on-disk aggregate disk allocation map descriptor.
197 	__le32 dn_maxag;	/* 4: max active alloc group number	*/
198 	__le32 dn_agpref;	/* 4: preferred alloc group (hint)	*/
202 	__le32 dn_agstart;	/* 4: start tree index at AG height	*/
203 	__le32 dn_agl2size;	/* 4: l2 num of blks per alloc group	*/
205 	__le64 dn_agsize;	/* 8: num of blks per alloc group	*/
208 };				/* - 4096 -				*/
216 	int dn_maxag;		/* max active alloc group number	*/
217 	int dn_agpref;		/* preferred alloc group (hint)		*/
221 	int dn_agstart;		/* start tree index at AG height	*/
222 	int dn_agl2size;	/* l2 num of blks per alloc group	*/
224 	s64 dn_agsize;		/* num of blks per alloc group		*/
226 };				/* - 4096 -				*/
228  *	in-memory aggregate disk allocation map descriptor.
231 	struct dbmap db_bmap;		/* on-disk aggregate map descriptor */
238 /* macros for accessing fields within in-memory aggregate map descriptor */
265 #define	NLSTOL2BSZ(n)		(31 - cntlz((n)) + BUDMIN)
267 /* convert leaf index to log2 leaf value */
270 /* convert a block number to a dmap control leaf index */
272 	(((b) & (((s64)1 << ((m) + L2LPERCTL)) - 1)) >> (m))
275 #define	BUDSIZE(s,m)		(1 << ((s) - (m)))