fs/jfs/jfs_imap.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3  *   Copyright (C) International Business Machines Corp., 2000-2002
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	*/
29 /* convert iag number to logical block number of the iag page */
30 #define IAGTOLBLK(iagno,l2nbperpg)	(((iagno) + 1) << (l2nbperpg))
32 /* get the starting block number of the 4K page of an inode extent
36 	((((ino) & (INOSPEREXT-1)) >> L2INOSPERPAGE) << (l2nbperpg)))
41  * inode allocation map consists of
47  *	inode allocation group page (per 4096 inodes of an AG)
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			*/
58 	/* summary map: 1 bit per inode extent */
59 	__le32 inosmap[SMAPSZ];	/* 16: sum map of mapwords w/ free inodes;
62 				 *	value will be 1.  if the extent is
64 				 *	value will be 1.  if the extent is
65 				 *	backed but at least one of the inodes is
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		*/
73 	/* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
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		*/
92 	int numinos;		/* number of backed inodes		*/
93 	int numfree;		/* number of free inodes		*/
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 */
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		*/
125  *	In-core inode map control page
129 	struct inode *im_ipimap;	/* 4: ptr to inode for imap	*/
130 	struct mutex im_freelock;	/* 4: iag free list lock	*/
133 	atomic_t im_numinos;	/* num of backed inodes */
134 	atomic_t im_numfree;	/* num of free backed inodes */