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162 lines
5.8 KiB
162 lines
5.8 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2002 |
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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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