jfs_imap.h

  1/* SPDX-License-Identifier: GPL-2.0-or-later */
  2/*
  3 *   Copyright (C) International Business Machines Corp., 2000-2002
  4 */
  5#ifndef	_H_JFS_IMAP
  6#define _H_JFS_IMAP
  7
  8#include "jfs_txnmgr.h"
  9
 10/*
 11 *	jfs_imap.h: disk inode manager
 12 */
 13
 14#define	EXTSPERIAG	128	/* number of disk inode extent per iag	*/
 15#define IMAPBLKNO	0	/* lblkno of dinomap within inode map	*/
 16#define SMAPSZ		4	/* number of words per summary map	*/
 17#define	EXTSPERSUM	32	/* number of extents per summary map entry */
 18#define	L2EXTSPERSUM	5	/* l2 number of extents per summary map */
 19#define	PGSPERIEXT	4	/* number of 4K pages per dinode extent */
 20#define	MAXIAGS		((1<<20)-1)	/* maximum number of iags	*/
 21#define	MAXAG		128	/* maximum number of allocation groups	*/
 22
 23#define AMAPSIZE	512	/* bytes in the IAG allocation maps */
 24#define SMAPSIZE	16	/* bytes in the IAG summary maps */
 25
 26/* convert inode number to iag number */
 27#define	INOTOIAG(ino)	((ino) >> L2INOSPERIAG)
 28
 29/* convert iag number to logical block number of the iag page */
 30#define IAGTOLBLK(iagno,l2nbperpg)	(((iagno) + 1) << (l2nbperpg))
 31
 32/* get the starting block number of the 4K page of an inode extent
 33 * that contains ino.
 34 */
 35#define INOPBLK(pxd,ino,l2nbperpg)	(addressPXD((pxd)) +		\
 36	((((ino) & (INOSPEREXT-1)) >> L2INOSPERPAGE) << (l2nbperpg)))
 37
 38/*
 39 *	inode allocation map:
 40 *
 41 * inode allocation map consists of
 42 * . the inode map control page and
 43 * . inode allocation group pages (per 4096 inodes)
 44 * which are addressed by standard JFS xtree.
 45 */
 46/*
 47 *	inode allocation group page (per 4096 inodes of an AG)
 48 */
 49struct iag {
 50	__le64 agstart;		/* 8: starting block of ag		*/
 51	__le32 iagnum;		/* 4: inode allocation group number	*/
 52	__le32 inofreefwd;	/* 4: ag inode free list forward	*/
 53	__le32 inofreeback;	/* 4: ag inode free list back		*/
 54	__le32 extfreefwd;	/* 4: ag inode extent free list forward	*/
 55	__le32 extfreeback;	/* 4: ag inode extent free list back	*/
 56	__le32 iagfree;		/* 4: iag free list			*/
 57
 58	/* summary map: 1 bit per inode extent */
 59	__le32 inosmap[SMAPSZ];	/* 16: sum map of mapwords w/ free inodes;
 60				 *	note: this indicates free and backed
 61				 *	inodes, if the extent is not backed the
 62				 *	value will be 1.  if the extent is
 63				 *	backed but all inodes are being used the
 64				 *	value will be 1.  if the extent is
 65				 *	backed but at least one of the inodes is
 66				 *	free the value will be 0.
 67				 */
 68	__le32 extsmap[SMAPSZ];	/* 16: sum map of mapwords w/ free extents */
 69	__le32 nfreeinos;	/* 4: number of free inodes		*/
 70	__le32 nfreeexts;	/* 4: number of free extents		*/
 71	/* (72) */
 72	u8 pad[1976];		/* 1976: pad to 2048 bytes */
 73	/* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
 74	__le32 wmap[EXTSPERIAG];	/* 512: working allocation map */
 75	__le32 pmap[EXTSPERIAG];	/* 512: persistent allocation map */
 76	pxd_t inoext[EXTSPERIAG];	/* 1024: inode extent addresses */
 77};				/* (4096) */
 78
 79/*
 80 *	per AG control information (in inode map control page)
 81 */
 82struct iagctl_disk {
 83	__le32 inofree;		/* 4: free inode list anchor		*/
 84	__le32 extfree;		/* 4: free extent list anchor		*/
 85	__le32 numinos;		/* 4: number of backed inodes		*/
 86	__le32 numfree;		/* 4: number of free inodes		*/
 87};				/* (16) */
 88
 89struct iagctl {
 90	int inofree;		/* free inode list anchor		*/
 91	int extfree;		/* free extent list anchor		*/
 92	int numinos;		/* number of backed inodes		*/
 93	int numfree;		/* number of free inodes		*/
 94};
 95
 96/*
 97 *	per fileset/aggregate inode map control page
 98 */
 99struct dinomap_disk {
100	__le32 in_freeiag;	/* 4: free iag list anchor	*/
101	__le32 in_nextiag;	/* 4: next free iag number	*/
102	__le32 in_numinos;	/* 4: num of backed inodes	*/
103	__le32 in_numfree;	/* 4: num of free backed inodes */
104	__le32 in_nbperiext;	/* 4: num of blocks per inode extent */
105	__le32 in_l2nbperiext;	/* 4: l2 of in_nbperiext	*/
106	__le32 in_diskblock;	/* 4: for standalone test driver */
107	__le32 in_maxag;	/* 4: for standalone test driver */
108	u8 pad[2016];		/* 2016: pad to 2048		*/
109	struct iagctl_disk in_agctl[MAXAG]; /* 2048: AG control information */
110};				/* (4096) */
111
112struct dinomap {
113	int in_freeiag;		/* free iag list anchor		*/
114	int in_nextiag;		/* next free iag number		*/
115	int in_numinos;		/* num of backed inodes		*/
116	int in_numfree;		/* num of free backed inodes	*/
117	int in_nbperiext;	/* num of blocks per inode extent */
118	int in_l2nbperiext;	/* l2 of in_nbperiext		*/
119	int in_diskblock;	/* for standalone test driver	*/
120	int in_maxag;		/* for standalone test driver	*/
121	struct iagctl in_agctl[MAXAG];	/* AG control information */
122};
123
124/*
125 *	In-core inode map control page
126 */
127struct inomap {
128	struct dinomap im_imap;		/* 4096: inode allocation control */
129	struct inode *im_ipimap;	/* 4: ptr to inode for imap	*/
130	struct mutex im_freelock;	/* 4: iag free list lock	*/
131	struct mutex im_aglock[MAXAG];	/* 512: per AG locks		*/
132	u32 *im_DBGdimap;
133	atomic_t im_numinos;	/* num of backed inodes */
134	atomic_t im_numfree;	/* num of free backed inodes */
135};
136
137#define	im_freeiag	im_imap.in_freeiag
138#define	im_nextiag	im_imap.in_nextiag
139#define	im_agctl	im_imap.in_agctl
140#define	im_nbperiext	im_imap.in_nbperiext
141#define	im_l2nbperiext	im_imap.in_l2nbperiext
142
143/* for standalone testdriver
144 */
145#define	im_diskblock	im_imap.in_diskblock
146#define	im_maxag	im_imap.in_maxag
147
148extern int diFree(struct inode *);
149extern int diAlloc(struct inode *, bool, struct inode *);
150extern int diSync(struct inode *);
151/* external references */
152extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
153			bool is_free, struct tblock * tblk);
154extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
155extern int diMount(struct inode *);
156extern int diUnmount(struct inode *, int);
157extern int diRead(struct inode *);
158extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
159extern void diWriteSpecial(struct inode *, int);
160extern void diFreeSpecial(struct inode *);
161extern int diWrite(tid_t tid, struct inode *);
162#endif				/* _H_JFS_IMAP */