315 lines
11 KiB
C
315 lines
11 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2002
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _H_JFS_DMAP
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#define _H_JFS_DMAP
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#include "jfs_txnmgr.h"
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#define BMAPVERSION 1 /* version number */
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#define TREESIZE (256+64+16+4+1) /* size of a dmap tree */
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#define LEAFIND (64+16+4+1) /* index of 1st leaf of a dmap tree */
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#define LPERDMAP 256 /* num leaves per dmap tree */
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#define L2LPERDMAP 8 /* l2 number of leaves per dmap tree */
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#define DBWORD 32 /* # of blks covered by a map word */
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#define L2DBWORD 5 /* l2 # of blks covered by a mword */
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#define BUDMIN L2DBWORD /* max free string in a map word */
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#define BPERDMAP (LPERDMAP * DBWORD) /* num of blks per dmap */
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#define L2BPERDMAP 13 /* l2 num of blks per dmap */
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#define CTLTREESIZE (1024+256+64+16+4+1) /* size of a dmapctl tree */
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#define CTLLEAFIND (256+64+16+4+1) /* idx of 1st leaf of a dmapctl tree */
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#define LPERCTL 1024 /* num of leaves per dmapctl tree */
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#define L2LPERCTL 10 /* l2 num of leaves per dmapctl tree */
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#define ROOT 0 /* index of the root of a tree */
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#define NOFREE ((s8) -1) /* no blocks free */
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#define MAXAG 128 /* max number of allocation groups */
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#define L2MAXAG 7 /* l2 max num of AG */
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#define L2MINAGSZ 25 /* l2 of minimum AG size in bytes */
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#define BMAPBLKNO 0 /* lblkno of bmap within the map */
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/*
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* maximum l2 number of disk blocks at the various dmapctl levels.
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*/
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#define L2MAXL0SIZE (L2BPERDMAP + 1 * L2LPERCTL)
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#define L2MAXL1SIZE (L2BPERDMAP + 2 * L2LPERCTL)
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#define L2MAXL2SIZE (L2BPERDMAP + 3 * L2LPERCTL)
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/*
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* maximum number of disk blocks at the various dmapctl levels.
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*/
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#define MAXL0SIZE ((s64)1 << L2MAXL0SIZE)
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#define MAXL1SIZE ((s64)1 << L2MAXL1SIZE)
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#define MAXL2SIZE ((s64)1 << L2MAXL2SIZE)
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#define MAXMAPSIZE MAXL2SIZE /* maximum aggregate map size */
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/*
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* determine the maximum free string for four (lower level) nodes
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* of the tree.
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*/
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static __inline signed char TREEMAX(signed char *cp)
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{
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signed char tmp1, tmp2;
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tmp1 = max(*(cp+2), *(cp+3));
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tmp2 = max(*(cp), *(cp+1));
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return max(tmp1, tmp2);
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}
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/*
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* convert disk block number to the logical block number of the dmap
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* describing the disk block. s is the log2(number of logical blocks per page)
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*
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* The calculation figures out how many logical pages are in front of the dmap.
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* - the number of dmaps preceding it
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* - the number of L0 pages preceding its L0 page
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* - the number of L1 pages preceding its L1 page
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* - 3 is added to account for the L2, L1, and L0 page for this dmap
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* - 1 is added to account for the control page of the map.
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*/
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#define BLKTODMAP(b,s) \
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((((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1) << (s))
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/*
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* convert disk block number to the logical block number of the LEVEL 0
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* dmapctl describing the disk block. s is the log2(number of logical blocks
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* per page)
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*
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* The calculation figures out how many logical pages are in front of the L0.
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* - the number of dmap pages preceding it
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* - the number of L0 pages preceding it
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* - the number of L1 pages preceding its L1 page
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* - 2 is added to account for the L2, and L1 page for this L0
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* - 1 is added to account for the control page of the map.
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*/
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#define BLKTOL0(b,s) \
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(((((b) >> 23) << 10) + ((b) >> 23) + ((b) >> 33) + 2 + 1) << (s))
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/*
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* convert disk block number to the logical block number of the LEVEL 1
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* dmapctl describing the disk block. s is the log2(number of logical blocks
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* per page)
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*
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* The calculation figures out how many logical pages are in front of the L1.
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* - the number of dmap pages preceding it
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* - the number of L0 pages preceding it
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* - the number of L1 pages preceding it
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* - 1 is added to account for the L2 page
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* - 1 is added to account for the control page of the map.
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*/
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#define BLKTOL1(b,s) \
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(((((b) >> 33) << 20) + (((b) >> 33) << 10) + ((b) >> 33) + 1 + 1) << (s))
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/*
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* convert disk block number to the logical block number of the dmapctl
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* at the specified level which describes the disk block.
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*/
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#define BLKTOCTL(b,s,l) \
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(((l) == 2) ? 1 : ((l) == 1) ? BLKTOL1((b),(s)) : BLKTOL0((b),(s)))
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/*
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* convert aggregate map size to the zero origin dmapctl level of the
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* top dmapctl.
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*/
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#define BMAPSZTOLEV(size) \
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(((size) <= MAXL0SIZE) ? 0 : ((size) <= MAXL1SIZE) ? 1 : 2)
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/* convert disk block number to allocation group number.
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*/
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#define BLKTOAG(b,sbi) ((b) >> ((sbi)->bmap->db_agl2size))
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/* convert allocation group number to starting disk block
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* number.
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*/
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#define AGTOBLK(a,ip) \
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((s64)(a) << (JFS_SBI((ip)->i_sb)->bmap->db_agl2size))
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/*
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* dmap summary tree
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*
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* dmaptree must be consistent with dmapctl.
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*/
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struct dmaptree {
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__le32 nleafs; /* 4: number of tree leafs */
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__le32 l2nleafs; /* 4: l2 number of tree leafs */
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__le32 leafidx; /* 4: index of first tree leaf */
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__le32 height; /* 4: height of the tree */
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s8 budmin; /* 1: min l2 tree leaf value to combine */
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s8 stree[TREESIZE]; /* TREESIZE: tree */
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u8 pad[2]; /* 2: pad to word boundary */
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}; /* - 360 - */
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/*
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* dmap page per 8K blocks bitmap
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*/
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struct dmap {
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__le32 nblocks; /* 4: num blks covered by this dmap */
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__le32 nfree; /* 4: num of free blks in this dmap */
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__le64 start; /* 8: starting blkno for this dmap */
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struct dmaptree tree; /* 360: dmap tree */
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u8 pad[1672]; /* 1672: pad to 2048 bytes */
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__le32 wmap[LPERDMAP]; /* 1024: bits of the working map */
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__le32 pmap[LPERDMAP]; /* 1024: bits of the persistent map */
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}; /* - 4096 - */
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/*
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* disk map control page per level.
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*
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* dmapctl must be consistent with dmaptree.
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*/
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struct dmapctl {
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__le32 nleafs; /* 4: number of tree leafs */
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__le32 l2nleafs; /* 4: l2 number of tree leafs */
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__le32 leafidx; /* 4: index of the first tree leaf */
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__le32 height; /* 4: height of tree */
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s8 budmin; /* 1: minimum l2 tree leaf value */
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s8 stree[CTLTREESIZE]; /* CTLTREESIZE: dmapctl tree */
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u8 pad[2714]; /* 2714: pad to 4096 */
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}; /* - 4096 - */
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/*
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* common definition for dmaptree within dmap and dmapctl
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*/
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typedef union dmtree {
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struct dmaptree t1;
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struct dmapctl t2;
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} dmtree_t;
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/* macros for accessing fields within dmtree */
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#define dmt_nleafs t1.nleafs
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#define dmt_l2nleafs t1.l2nleafs
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#define dmt_leafidx t1.leafidx
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#define dmt_height t1.height
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#define dmt_budmin t1.budmin
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#define dmt_stree t1.stree
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/*
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* on-disk aggregate disk allocation map descriptor.
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*/
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struct dbmap_disk {
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__le64 dn_mapsize; /* 8: number of blocks in aggregate */
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__le64 dn_nfree; /* 8: num free blks in aggregate map */
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__le32 dn_l2nbperpage; /* 4: number of blks per page */
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__le32 dn_numag; /* 4: total number of ags */
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__le32 dn_maxlevel; /* 4: number of active ags */
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__le32 dn_maxag; /* 4: max active alloc group number */
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__le32 dn_agpref; /* 4: preferred alloc group (hint) */
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__le32 dn_aglevel; /* 4: dmapctl level holding the AG */
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__le32 dn_agheigth; /* 4: height in dmapctl of the AG */
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__le32 dn_agwidth; /* 4: width in dmapctl of the AG */
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__le32 dn_agstart; /* 4: start tree index at AG height */
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__le32 dn_agl2size; /* 4: l2 num of blks per alloc group */
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__le64 dn_agfree[MAXAG];/* 8*MAXAG: per AG free count */
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__le64 dn_agsize; /* 8: num of blks per alloc group */
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s8 dn_maxfreebud; /* 1: max free buddy system */
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u8 pad[3007]; /* 3007: pad to 4096 */
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}; /* - 4096 - */
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struct dbmap {
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s64 dn_mapsize; /* number of blocks in aggregate */
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s64 dn_nfree; /* num free blks in aggregate map */
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int dn_l2nbperpage; /* number of blks per page */
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int dn_numag; /* total number of ags */
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int dn_maxlevel; /* number of active ags */
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int dn_maxag; /* max active alloc group number */
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int dn_agpref; /* preferred alloc group (hint) */
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int dn_aglevel; /* dmapctl level holding the AG */
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int dn_agheigth; /* height in dmapctl of the AG */
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int dn_agwidth; /* width in dmapctl of the AG */
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int dn_agstart; /* start tree index at AG height */
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int dn_agl2size; /* l2 num of blks per alloc group */
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s64 dn_agfree[MAXAG]; /* per AG free count */
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s64 dn_agsize; /* num of blks per alloc group */
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signed char dn_maxfreebud; /* max free buddy system */
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}; /* - 4096 - */
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/*
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* in-memory aggregate disk allocation map descriptor.
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*/
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struct bmap {
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struct dbmap db_bmap; /* on-disk aggregate map descriptor */
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struct inode *db_ipbmap; /* ptr to aggregate map incore inode */
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struct mutex db_bmaplock; /* aggregate map lock */
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atomic_t db_active[MAXAG]; /* count of active, open files in AG */
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u32 *db_DBmap;
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};
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/* macros for accessing fields within in-memory aggregate map descriptor */
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#define db_mapsize db_bmap.dn_mapsize
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#define db_nfree db_bmap.dn_nfree
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#define db_agfree db_bmap.dn_agfree
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#define db_agsize db_bmap.dn_agsize
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#define db_agl2size db_bmap.dn_agl2size
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#define db_agwidth db_bmap.dn_agwidth
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#define db_agheigth db_bmap.dn_agheigth
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#define db_agstart db_bmap.dn_agstart
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#define db_numag db_bmap.dn_numag
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#define db_maxlevel db_bmap.dn_maxlevel
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#define db_aglevel db_bmap.dn_aglevel
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#define db_agpref db_bmap.dn_agpref
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#define db_maxag db_bmap.dn_maxag
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#define db_maxfreebud db_bmap.dn_maxfreebud
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#define db_l2nbperpage db_bmap.dn_l2nbperpage
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/*
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* macros for various conversions needed by the allocators.
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* blkstol2(), cntlz(), and cnttz() are operating system dependent functions.
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*/
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/* convert number of blocks to log2 number of blocks, rounding up to
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* the next log2 value if blocks is not a l2 multiple.
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*/
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#define BLKSTOL2(d) (blkstol2(d))
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/* convert number of leafs to log2 leaf value */
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#define NLSTOL2BSZ(n) (31 - cntlz((n)) + BUDMIN)
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/* convert leaf index to log2 leaf value */
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#define LITOL2BSZ(n,m,b) ((((n) == 0) ? (m) : cnttz((n))) + (b))
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/* convert a block number to a dmap control leaf index */
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#define BLKTOCTLLEAF(b,m) \
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(((b) & (((s64)1 << ((m) + L2LPERCTL)) - 1)) >> (m))
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/* convert log2 leaf value to buddy size */
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#define BUDSIZE(s,m) (1 << ((s) - (m)))
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/*
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* external references.
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*/
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extern int dbMount(struct inode *ipbmap);
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extern int dbUnmount(struct inode *ipbmap, int mounterror);
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extern int dbFree(struct inode *ipbmap, s64 blkno, s64 nblocks);
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extern int dbUpdatePMap(struct inode *ipbmap,
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int free, s64 blkno, s64 nblocks, struct tblock * tblk);
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extern int dbNextAG(struct inode *ipbmap);
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extern int dbAlloc(struct inode *ipbmap, s64 hint, s64 nblocks, s64 * results);
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extern int dbReAlloc(struct inode *ipbmap,
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s64 blkno, s64 nblocks, s64 addnblocks, s64 * results);
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extern int dbSync(struct inode *ipbmap);
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extern int dbAllocBottomUp(struct inode *ip, s64 blkno, s64 nblocks);
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extern int dbExtendFS(struct inode *ipbmap, s64 blkno, s64 nblocks);
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extern void dbFinalizeBmap(struct inode *ipbmap);
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extern s64 dbMapFileSizeToMapSize(struct inode *ipbmap);
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#endif /* _H_JFS_DMAP */
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