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175 lines
6.4 KiB
C
175 lines
6.4 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_IMAP
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#define _H_JFS_IMAP
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#include "jfs_txnmgr.h"
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/*
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* jfs_imap.h: disk inode manager
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*/
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#define EXTSPERIAG 128 /* number of disk inode extent per iag */
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#define IMAPBLKNO 0 /* lblkno of dinomap within inode map */
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#define SMAPSZ 4 /* number of words per summary map */
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#define EXTSPERSUM 32 /* number of extents per summary map entry */
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#define L2EXTSPERSUM 5 /* l2 number of extents per summary map */
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#define PGSPERIEXT 4 /* number of 4K pages per dinode extent */
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#define MAXIAGS ((1<<20)-1) /* maximum number of iags */
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#define MAXAG 128 /* maximum number of allocation groups */
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#define AMAPSIZE 512 /* bytes in the IAG allocation maps */
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#define SMAPSIZE 16 /* bytes in the IAG summary maps */
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/* convert inode number to iag number */
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#define INOTOIAG(ino) ((ino) >> L2INOSPERIAG)
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/* convert iag number to logical block number of the iag page */
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#define IAGTOLBLK(iagno,l2nbperpg) (((iagno) + 1) << (l2nbperpg))
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/* get the starting block number of the 4K page of an inode extent
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* that contains ino.
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*/
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#define INOPBLK(pxd,ino,l2nbperpg) (addressPXD((pxd)) + \
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((((ino) & (INOSPEREXT-1)) >> L2INOSPERPAGE) << (l2nbperpg)))
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/*
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* inode allocation map:
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*
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* inode allocation map consists of
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* . the inode map control page and
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* . inode allocation group pages (per 4096 inodes)
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* which are addressed by standard JFS xtree.
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*/
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/*
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* inode allocation group page (per 4096 inodes of an AG)
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*/
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struct iag {
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__le64 agstart; /* 8: starting block of ag */
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__le32 iagnum; /* 4: inode allocation group number */
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__le32 inofreefwd; /* 4: ag inode free list forward */
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__le32 inofreeback; /* 4: ag inode free list back */
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__le32 extfreefwd; /* 4: ag inode extent free list forward */
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__le32 extfreeback; /* 4: ag inode extent free list back */
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__le32 iagfree; /* 4: iag free list */
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/* summary map: 1 bit per inode extent */
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__le32 inosmap[SMAPSZ]; /* 16: sum map of mapwords w/ free inodes;
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* note: this indicates free and backed
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* inodes, if the extent is not backed the
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* value will be 1. if the extent is
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* backed but all inodes are being used the
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* value will be 1. if the extent is
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* backed but at least one of the inodes is
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* free the value will be 0.
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*/
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__le32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */
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__le32 nfreeinos; /* 4: number of free inodes */
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__le32 nfreeexts; /* 4: number of free extents */
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/* (72) */
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u8 pad[1976]; /* 1976: pad to 2048 bytes */
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/* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
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__le32 wmap[EXTSPERIAG]; /* 512: working allocation map */
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__le32 pmap[EXTSPERIAG]; /* 512: persistent allocation map */
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pxd_t inoext[EXTSPERIAG]; /* 1024: inode extent addresses */
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}; /* (4096) */
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/*
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* per AG control information (in inode map control page)
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*/
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struct iagctl_disk {
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__le32 inofree; /* 4: free inode list anchor */
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__le32 extfree; /* 4: free extent list anchor */
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__le32 numinos; /* 4: number of backed inodes */
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__le32 numfree; /* 4: number of free inodes */
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}; /* (16) */
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struct iagctl {
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int inofree; /* free inode list anchor */
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int extfree; /* free extent list anchor */
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int numinos; /* number of backed inodes */
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int numfree; /* number of free inodes */
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};
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/*
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* per fileset/aggregate inode map control page
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*/
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struct dinomap_disk {
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__le32 in_freeiag; /* 4: free iag list anchor */
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__le32 in_nextiag; /* 4: next free iag number */
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__le32 in_numinos; /* 4: num of backed inodes */
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__le32 in_numfree; /* 4: num of free backed inodes */
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__le32 in_nbperiext; /* 4: num of blocks per inode extent */
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__le32 in_l2nbperiext; /* 4: l2 of in_nbperiext */
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__le32 in_diskblock; /* 4: for standalone test driver */
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__le32 in_maxag; /* 4: for standalone test driver */
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u8 pad[2016]; /* 2016: pad to 2048 */
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struct iagctl_disk in_agctl[MAXAG]; /* 2048: AG control information */
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}; /* (4096) */
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struct dinomap {
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int in_freeiag; /* free iag list anchor */
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int in_nextiag; /* next free iag number */
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int in_numinos; /* num of backed inodes */
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int in_numfree; /* num of free backed inodes */
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int in_nbperiext; /* num of blocks per inode extent */
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int in_l2nbperiext; /* l2 of in_nbperiext */
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int in_diskblock; /* for standalone test driver */
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int in_maxag; /* for standalone test driver */
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struct iagctl in_agctl[MAXAG]; /* AG control information */
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};
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/*
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* In-core inode map control page
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*/
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struct inomap {
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struct dinomap im_imap; /* 4096: inode allocation control */
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struct inode *im_ipimap; /* 4: ptr to inode for imap */
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struct mutex im_freelock; /* 4: iag free list lock */
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struct mutex im_aglock[MAXAG]; /* 512: per AG locks */
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u32 *im_DBGdimap;
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atomic_t im_numinos; /* num of backed inodes */
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atomic_t im_numfree; /* num of free backed inodes */
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};
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#define im_freeiag im_imap.in_freeiag
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#define im_nextiag im_imap.in_nextiag
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#define im_agctl im_imap.in_agctl
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#define im_nbperiext im_imap.in_nbperiext
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#define im_l2nbperiext im_imap.in_l2nbperiext
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/* for standalone testdriver
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*/
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#define im_diskblock im_imap.in_diskblock
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#define im_maxag im_imap.in_maxag
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extern int diFree(struct inode *);
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extern int diAlloc(struct inode *, bool, struct inode *);
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extern int diSync(struct inode *);
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/* external references */
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extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
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bool is_free, struct tblock * tblk);
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extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
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extern int diMount(struct inode *);
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extern int diUnmount(struct inode *, int);
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extern int diRead(struct inode *);
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extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
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extern void diWriteSpecial(struct inode *, int);
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extern void diFreeSpecial(struct inode *);
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extern int diWrite(tid_t tid, struct inode *);
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#endif /* _H_JFS_IMAP */
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