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alistair23-linux/fs/jfs/jfs_dmap.h
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  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 either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will 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 to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) International Business Machines Corp., 2000-2002
*/
#ifndef _H_JFS_DMAP
#define _H_JFS_DMAP
#include "jfs_txnmgr.h"
#define BMAPVERSION 1 /* version number */
#define TREESIZE (256+64+16+4+1) /* size of a dmap tree */
#define LEAFIND (64+16+4+1) /* index of 1st leaf of a dmap tree */
#define LPERDMAP 256 /* num leaves per dmap tree */
#define L2LPERDMAP 8 /* l2 number of leaves per dmap tree */
#define DBWORD 32 /* # of blks covered by a map word */
#define L2DBWORD 5 /* l2 # of blks covered by a mword */
#define BUDMIN L2DBWORD /* max free string in a map word */
#define BPERDMAP (LPERDMAP * DBWORD) /* num of blks per dmap */
#define L2BPERDMAP 13 /* l2 num of blks per dmap */
#define CTLTREESIZE (1024+256+64+16+4+1) /* size of a dmapctl tree */
#define CTLLEAFIND (256+64+16+4+1) /* idx of 1st leaf of a dmapctl tree */
#define LPERCTL 1024 /* num of leaves per dmapctl tree */
#define L2LPERCTL 10 /* l2 num of leaves per dmapctl tree */
#define ROOT 0 /* index of the root of a tree */
#define NOFREE ((s8) -1) /* no blocks free */
#define MAXAG 128 /* max number of allocation groups */
#define L2MAXAG 7 /* l2 max num of AG */
#define L2MINAGSZ 25 /* l2 of minimum AG size in bytes */
#define BMAPBLKNO 0 /* lblkno of bmap within the map */
/*
* maximum l2 number of disk blocks at the various dmapctl levels.
*/
#define L2MAXL0SIZE (L2BPERDMAP + 1 * L2LPERCTL)
#define L2MAXL1SIZE (L2BPERDMAP + 2 * L2LPERCTL)
#define L2MAXL2SIZE (L2BPERDMAP + 3 * L2LPERCTL)
/*
* maximum number of disk blocks at the various dmapctl levels.
*/
#define MAXL0SIZE ((s64)1 << L2MAXL0SIZE)
#define MAXL1SIZE ((s64)1 << L2MAXL1SIZE)
#define MAXL2SIZE ((s64)1 << L2MAXL2SIZE)
#define MAXMAPSIZE MAXL2SIZE /* maximum aggregate map size */
/*
* determine the maximum free string for four (lower level) nodes
* of the tree.
*/
static inline signed char TREEMAX(signed char *cp)
{
signed char tmp1, tmp2;
tmp1 = max(*(cp+2), *(cp+3));
tmp2 = max(*(cp), *(cp+1));
return max(tmp1, tmp2);
}
/*
* convert disk block number to the logical block number of the dmap
* describing the disk block. s is the log2(number of logical blocks per page)
*
* The calculation figures out how many logical pages are in front of the dmap.
* - the number of dmaps preceding it
* - the number of L0 pages preceding its L0 page
* - the number of L1 pages preceding its L1 page
* - 3 is added to account for the L2, L1, and L0 page for this dmap
* - 1 is added to account for the control page of the map.
*/
#define BLKTODMAP(b,s) \
((((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1) << (s))
/*
* convert disk block number to the logical block number of the LEVEL 0
* dmapctl describing the disk block. s is the log2(number of logical blocks
* per page)
*
* The calculation figures out how many logical pages are in front of the L0.
* - the number of dmap pages preceding it
* - the number of L0 pages preceding it
* - the number of L1 pages preceding its L1 page
* - 2 is added to account for the L2, and L1 page for this L0
* - 1 is added to account for the control page of the map.
*/
#define BLKTOL0(b,s) \
(((((b) >> 23) << 10) + ((b) >> 23) + ((b) >> 33) + 2 + 1) << (s))
/*
* convert disk block number to the logical block number of the LEVEL 1
* dmapctl describing the disk block. s is the log2(number of logical blocks
* per page)
*
* The calculation figures out how many logical pages are in front of the L1.
* - the number of dmap pages preceding it
* - the number of L0 pages preceding it
* - the number of L1 pages preceding it
* - 1 is added to account for the L2 page
* - 1 is added to account for the control page of the map.
*/
#define BLKTOL1(b,s) \
(((((b) >> 33) << 20) + (((b) >> 33) << 10) + ((b) >> 33) + 1 + 1) << (s))
/*
* convert disk block number to the logical block number of the dmapctl
* at the specified level which describes the disk block.
*/
#define BLKTOCTL(b,s,l) \
(((l) == 2) ? 1 : ((l) == 1) ? BLKTOL1((b),(s)) : BLKTOL0((b),(s)))
/*
* convert aggregate map size to the zero origin dmapctl level of the
* top dmapctl.
*/
#define BMAPSZTOLEV(size) \
(((size) <= MAXL0SIZE) ? 0 : ((size) <= MAXL1SIZE) ? 1 : 2)
/* convert disk block number to allocation group number.
*/
#define BLKTOAG(b,sbi) ((b) >> ((sbi)->bmap->db_agl2size))
/* convert allocation group number to starting disk block
* number.
*/
#define AGTOBLK(a,ip) \
((s64)(a) << (JFS_SBI((ip)->i_sb)->bmap->db_agl2size))
/*
* dmap summary tree
*
* dmaptree must be consistent with dmapctl.
*/
struct dmaptree {
__le32 nleafs; /* 4: number of tree leafs */
__le32 l2nleafs; /* 4: l2 number of tree leafs */
__le32 leafidx; /* 4: index of first tree leaf */
__le32 height; /* 4: height of the tree */
s8 budmin; /* 1: min l2 tree leaf value to combine */
s8 stree[TREESIZE]; /* TREESIZE: tree */
u8 pad[2]; /* 2: pad to word boundary */
}; /* - 360 - */
/*
* dmap page per 8K blocks bitmap
*/
struct dmap {
__le32 nblocks; /* 4: num blks covered by this dmap */
__le32 nfree; /* 4: num of free blks in this dmap */
__le64 start; /* 8: starting blkno for this dmap */
struct dmaptree tree; /* 360: dmap tree */
u8 pad[1672]; /* 1672: pad to 2048 bytes */
__le32 wmap[LPERDMAP]; /* 1024: bits of the working map */
__le32 pmap[LPERDMAP]; /* 1024: bits of the persistent map */
}; /* - 4096 - */
/*
* disk map control page per level.
*
* dmapctl must be consistent with dmaptree.
*/
struct dmapctl {
__le32 nleafs; /* 4: number of tree leafs */
__le32 l2nleafs; /* 4: l2 number of tree leafs */
__le32 leafidx; /* 4: index of the first tree leaf */
__le32 height; /* 4: height of tree */
s8 budmin; /* 1: minimum l2 tree leaf value */
s8 stree[CTLTREESIZE]; /* CTLTREESIZE: dmapctl tree */
u8 pad[2714]; /* 2714: pad to 4096 */
}; /* - 4096 - */
/*
* common definition for dmaptree within dmap and dmapctl
*/
typedef union dmtree {
struct dmaptree t1;
struct dmapctl t2;
} dmtree_t;
/* macros for accessing fields within dmtree */
#define dmt_nleafs t1.nleafs
#define dmt_l2nleafs t1.l2nleafs
#define dmt_leafidx t1.leafidx
#define dmt_height t1.height
#define dmt_budmin t1.budmin
#define dmt_stree t1.stree
/*
* on-disk aggregate disk allocation map descriptor.
*/
struct dbmap_disk {
__le64 dn_mapsize; /* 8: number of blocks in aggregate */
__le64 dn_nfree; /* 8: num free blks in aggregate map */
__le32 dn_l2nbperpage; /* 4: number of blks per page */
__le32 dn_numag; /* 4: total number of ags */
__le32 dn_maxlevel; /* 4: number of active ags */
__le32 dn_maxag; /* 4: max active alloc group number */
__le32 dn_agpref; /* 4: preferred alloc group (hint) */
__le32 dn_aglevel; /* 4: dmapctl level holding the AG */
__le32 dn_agheight; /* 4: height in dmapctl of the AG */
__le32 dn_agwidth; /* 4: width in dmapctl of the AG */
__le32 dn_agstart; /* 4: start tree index at AG height */
__le32 dn_agl2size; /* 4: l2 num of blks per alloc group */
__le64 dn_agfree[MAXAG];/* 8*MAXAG: per AG free count */
__le64 dn_agsize; /* 8: num of blks per alloc group */
s8 dn_maxfreebud; /* 1: max free buddy system */
u8 pad[3007]; /* 3007: pad to 4096 */
}; /* - 4096 - */
struct dbmap {
s64 dn_mapsize; /* number of blocks in aggregate */
s64 dn_nfree; /* num free blks in aggregate map */
int dn_l2nbperpage; /* number of blks per page */
int dn_numag; /* total number of ags */
int dn_maxlevel; /* number of active ags */
int dn_maxag; /* max active alloc group number */
int dn_agpref; /* preferred alloc group (hint) */
int dn_aglevel; /* dmapctl level holding the AG */
int dn_agheight; /* height in dmapctl of the AG */
int dn_agwidth; /* width in dmapctl of the AG */
int dn_agstart; /* start tree index at AG height */
int dn_agl2size; /* l2 num of blks per alloc group */
s64 dn_agfree[MAXAG]; /* per AG free count */
s64 dn_agsize; /* num of blks per alloc group */
signed char dn_maxfreebud; /* max free buddy system */
}; /* - 4096 - */
/*
* in-memory aggregate disk allocation map descriptor.
*/
struct bmap {
struct dbmap db_bmap; /* on-disk aggregate map descriptor */
struct inode *db_ipbmap; /* ptr to aggregate map incore inode */
struct mutex db_bmaplock; /* aggregate map lock */
atomic_t db_active[MAXAG]; /* count of active, open files in AG */
u32 *db_DBmap;
};
/* macros for accessing fields within in-memory aggregate map descriptor */
#define db_mapsize db_bmap.dn_mapsize
#define db_nfree db_bmap.dn_nfree
#define db_agfree db_bmap.dn_agfree
#define db_agsize db_bmap.dn_agsize
#define db_agl2size db_bmap.dn_agl2size
#define db_agwidth db_bmap.dn_agwidth
#define db_agheight db_bmap.dn_agheight
#define db_agstart db_bmap.dn_agstart
#define db_numag db_bmap.dn_numag
#define db_maxlevel db_bmap.dn_maxlevel
#define db_aglevel db_bmap.dn_aglevel
#define db_agpref db_bmap.dn_agpref
#define db_maxag db_bmap.dn_maxag
#define db_maxfreebud db_bmap.dn_maxfreebud
#define db_l2nbperpage db_bmap.dn_l2nbperpage
/*
* macros for various conversions needed by the allocators.
* blkstol2(), cntlz(), and cnttz() are operating system dependent functions.
*/
/* convert number of blocks to log2 number of blocks, rounding up to
* the next log2 value if blocks is not a l2 multiple.
*/
#define BLKSTOL2(d) (blkstol2(d))
/* convert number of leafs to log2 leaf value */
#define NLSTOL2BSZ(n) (31 - cntlz((n)) + BUDMIN)
/* convert leaf index to log2 leaf value */
#define LITOL2BSZ(n,m,b) ((((n) == 0) ? (m) : cnttz((n))) + (b))
/* convert a block number to a dmap control leaf index */
#define BLKTOCTLLEAF(b,m) \
(((b) & (((s64)1 << ((m) + L2LPERCTL)) - 1)) >> (m))
/* convert log2 leaf value to buddy size */
#define BUDSIZE(s,m) (1 << ((s) - (m)))
/*
* external references.
*/
extern int dbMount(struct inode *ipbmap);
extern int dbUnmount(struct inode *ipbmap, int mounterror);
extern int dbFree(struct inode *ipbmap, s64 blkno, s64 nblocks);
extern int dbUpdatePMap(struct inode *ipbmap,
int free, s64 blkno, s64 nblocks, struct tblock * tblk);
extern int dbNextAG(struct inode *ipbmap);
extern int dbAlloc(struct inode *ipbmap, s64 hint, s64 nblocks, s64 * results);
extern int dbReAlloc(struct inode *ipbmap,
s64 blkno, s64 nblocks, s64 addnblocks, s64 * results);
extern int dbSync(struct inode *ipbmap);
extern int dbAllocBottomUp(struct inode *ip, s64 blkno, s64 nblocks);
extern int dbExtendFS(struct inode *ipbmap, s64 blkno, s64 nblocks);
extern void dbFinalizeBmap(struct inode *ipbmap);
extern s64 dbMapFileSizeToMapSize(struct inode *ipbmap);
extern s64 dbDiscardAG(struct inode *ip, int agno, s64 minlen);
#endif /* _H_JFS_DMAP */
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