1 /*
2  *   Copyright (C) International Business Machines Corp., 2000-2003
3  *
4  *   This program is free software;  you can redistribute it and/or modify
5  *   it under the terms of the GNU General Public License as published by
6  *   the Free Software Foundation; either version 2 of the License, or
7  *   (at your option) any later version.
8  *
9  *   This program is distributed in the hope that it will be useful,
10  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12  *   the GNU General Public License for more details.
13  *
14  *   You should have received a copy of the GNU General Public License
15  *   along with this program;  if not, write to the Free Software
16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  */
18 #ifndef _H_JFS_FILSYS
19 #define _H_JFS_FILSYS
20 
21 /*
22  *	jfs_filsys.h
23  *
24  * file system (implementation-dependent) constants
25  *
26  * refer to <limits.h> for system wide implementation-dependent constants
27  */
28 
29 /*
30  *	 file system option (superblock flag)
31  */
32 
33 /* directory option */
34 #define JFS_UNICODE	0x00000001	/* unicode name */
35 
36 /* mount time flags for error handling */
37 #define JFS_ERR_REMOUNT_RO 0x00000002	/* remount read-only */
38 #define JFS_ERR_CONTINUE   0x00000004	/* continue */
39 #define JFS_ERR_PANIC      0x00000008	/* panic */
40 
41 /* Quota support */
42 #define	JFS_USRQUOTA	0x00000010
43 #define	JFS_GRPQUOTA	0x00000020
44 
45 /* mount time flag to disable journaling to disk */
46 #define JFS_NOINTEGRITY 0x00000040
47 
48 /* mount time flag to enable TRIM to ssd disks */
49 #define JFS_DISCARD     0x00000080
50 
51 /* commit option */
52 #define	JFS_COMMIT	0x00000f00	/* commit option mask */
53 #define	JFS_GROUPCOMMIT	0x00000100	/* group (of 1) commit */
54 #define	JFS_LAZYCOMMIT	0x00000200	/* lazy commit */
55 #define	JFS_TMPFS	0x00000400	/* temporary file system -
56 					 * do not log/commit:
57 					 * Never implemented
58 					 */
59 
60 /* log logical volume option */
61 #define	JFS_INLINELOG	0x00000800	/* inline log within file system */
62 #define JFS_INLINEMOVE	0x00001000	/* inline log being moved */
63 
64 /* Secondary aggregate inode table */
65 #define JFS_BAD_SAIT	0x00010000	/* current secondary ait is bad */
66 
67 /* sparse regular file support */
68 #define JFS_SPARSE	0x00020000	/* sparse regular file */
69 
70 /* DASD Limits		F226941 */
71 #define JFS_DASD_ENABLED 0x00040000	/* DASD limits enabled */
72 #define	JFS_DASD_PRIME	0x00080000	/* Prime DASD usage on boot */
73 
74 /* big endian flag */
75 #define	JFS_SWAP_BYTES	0x00100000	/* running on big endian computer */
76 
77 /* Directory index */
78 #define JFS_DIR_INDEX	0x00200000	/* Persistent index for */
79 
80 /* platform options */
81 #define JFS_LINUX	0x10000000	/* Linux support */
82 #define JFS_DFS		0x20000000	/* DCE DFS LFS support */
83 /*	Never implemented */
84 
85 #define JFS_OS2		0x40000000	/* OS/2 support */
86 /*	case-insensitive name/directory support */
87 
88 #define JFS_AIX		0x80000000	/* AIX support */
89 
90 /*
91  *	buffer cache configuration
92  */
93 /* page size */
94 #ifdef PSIZE
95 #undef PSIZE
96 #endif
97 #define	PSIZE		4096	/* page size (in byte) */
98 #define	L2PSIZE		12	/* log2(PSIZE) */
99 #define	POFFSET		4095	/* offset within page */
100 
101 /* buffer page size */
102 #define BPSIZE	PSIZE
103 
104 /*
105  *	fs fundamental size
106  *
107  * PSIZE >= file system block size >= PBSIZE >= DISIZE
108  */
109 #define	PBSIZE		512	/* physical block size (in byte) */
110 #define	L2PBSIZE	9	/* log2(PBSIZE) */
111 
112 #define DISIZE		512	/* on-disk inode size (in byte) */
113 #define L2DISIZE	9	/* log2(DISIZE) */
114 
115 #define IDATASIZE	256	/* inode inline data size */
116 #define	IXATTRSIZE	128	/* inode inline extended attribute size */
117 
118 #define XTPAGE_SIZE	4096
119 #define log2_PAGESIZE	12
120 
121 #define IAG_SIZE	4096
122 #define IAG_EXTENT_SIZE 4096
123 #define	INOSPERIAG	4096	/* number of disk inodes per iag */
124 #define	L2INOSPERIAG	12	/* l2 number of disk inodes per iag */
125 #define INOSPEREXT	32	/* number of disk inode per extent */
126 #define L2INOSPEREXT	5	/* l2 number of disk inode per extent */
127 #define	IXSIZE		(DISIZE * INOSPEREXT)	/* inode extent size */
128 #define	INOSPERPAGE	8	/* number of disk inodes per 4K page */
129 #define	L2INOSPERPAGE	3	/* log2(INOSPERPAGE) */
130 
131 #define	IAGFREELIST_LWM	64
132 
133 #define INODE_EXTENT_SIZE	IXSIZE	/* inode extent size */
134 #define NUM_INODE_PER_EXTENT	INOSPEREXT
135 #define NUM_INODE_PER_IAG	INOSPERIAG
136 
137 #define MINBLOCKSIZE		512
138 #define L2MINBLOCKSIZE		9
139 #define MAXBLOCKSIZE		4096
140 #define L2MAXBLOCKSIZE		12
141 #define	MAXFILESIZE		((s64)1 << 52)
142 
143 #define JFS_LINK_MAX		0xffffffff
144 
145 /* Minimum number of bytes supported for a JFS partition */
146 #define MINJFS			(0x1000000)
147 #define MINJFSTEXT		"16"
148 
149 /*
150  * file system block size -> physical block size
151  */
152 #define LBOFFSET(x)	((x) & (PBSIZE - 1))
153 #define LBNUMBER(x)	((x) >> L2PBSIZE)
154 #define	LBLK2PBLK(sb,b)	((b) << (sb->s_blocksize_bits - L2PBSIZE))
155 #define	PBLK2LBLK(sb,b)	((b) >> (sb->s_blocksize_bits - L2PBSIZE))
156 /* size in byte -> last page number */
157 #define	SIZE2PN(size)	( ((s64)((size) - 1)) >> (L2PSIZE) )
158 /* size in byte -> last file system block number */
159 #define	SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
160 
161 /*
162  * fixed physical block address (physical block size = 512 byte)
163  *
164  * NOTE: since we can't guarantee a physical block size of 512 bytes the use of
165  *	 these macros should be removed and the byte offset macros used instead.
166  */
167 #define SUPER1_B	64	/* primary superblock */
168 #define	AIMAP_B		(SUPER1_B + 8)	/* 1st extent of aggregate inode map */
169 #define	AITBL_B		(AIMAP_B + 16)	/*
170 					 * 1st extent of aggregate inode table
171 					 */
172 #define	SUPER2_B	(AITBL_B + 32)	/* 2ndary superblock pbn */
173 #define	BMAP_B		(SUPER2_B + 8)	/* block allocation map */
174 
175 /*
176  * SIZE_OF_SUPER defines the total amount of space reserved on disk for the
177  * superblock.  This is not the same as the superblock structure, since all of
178  * this space is not currently being used.
179  */
180 #define SIZE_OF_SUPER	PSIZE
181 
182 /*
183  * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
184  */
185 #define SIZE_OF_AG_TABLE	PSIZE
186 
187 /*
188  * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
189  * the inode allocation map (to hold iag)
190  */
191 #define SIZE_OF_MAP_PAGE	PSIZE
192 
193 /*
194  * fixed byte offset address
195  */
196 #define SUPER1_OFF	0x8000	/* primary superblock */
197 #define AIMAP_OFF	(SUPER1_OFF + SIZE_OF_SUPER)
198 					/*
199 					 * Control page of aggregate inode map
200 					 * followed by 1st extent of map
201 					 */
202 #define AITBL_OFF	(AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
203 					/*
204 					 * 1st extent of aggregate inode table
205 					 */
206 #define SUPER2_OFF	(AITBL_OFF + INODE_EXTENT_SIZE)
207 					/*
208 					 * secondary superblock
209 					 */
210 #define BMAP_OFF	(SUPER2_OFF + SIZE_OF_SUPER)
211 					/*
212 					 * block allocation map
213 					 */
214 
215 /*
216  * The following macro is used to indicate the number of reserved disk blocks at
217  * the front of an aggregate, in terms of physical blocks.  This value is
218  * currently defined to be 32K.  This turns out to be the same as the primary
219  * superblock's address, since it directly follows the reserved blocks.
220  */
221 #define AGGR_RSVD_BLOCKS	SUPER1_B
222 
223 /*
224  * The following macro is used to indicate the number of reserved bytes at the
225  * front of an aggregate.  This value is currently defined to be 32K.  This
226  * turns out to be the same as the primary superblock's byte offset, since it
227  * directly follows the reserved blocks.
228  */
229 #define AGGR_RSVD_BYTES	SUPER1_OFF
230 
231 /*
232  * The following macro defines the byte offset for the first inode extent in
233  * the aggregate inode table.  This allows us to find the self inode to find the
234  * rest of the table.  Currently this value is 44K.
235  */
236 #define AGGR_INODE_TABLE_START	AITBL_OFF
237 
238 /*
239  *	fixed reserved inode number
240  */
241 /* aggregate inode */
242 #define AGGR_RESERVED_I	0	/* aggregate inode (reserved) */
243 #define	AGGREGATE_I	1	/* aggregate inode map inode */
244 #define	BMAP_I		2	/* aggregate block allocation map inode */
245 #define	LOG_I		3	/* aggregate inline log inode */
246 #define BADBLOCK_I	4	/* aggregate bad block inode */
247 #define	FILESYSTEM_I	16	/* 1st/only fileset inode in ait:
248 				 * fileset inode map inode
249 				 */
250 
251 /* per fileset inode */
252 #define FILESET_RSVD_I	0	/* fileset inode (reserved) */
253 #define FILESET_EXT_I	1	/* fileset inode extension */
254 #define	ROOT_I		2	/* fileset root inode */
255 #define ACL_I		3	/* fileset ACL inode */
256 
257 #define FILESET_OBJECT_I 4	/* the first fileset inode available for a file
258 				 * or directory or link...
259 				 */
260 #define FIRST_FILESET_INO 16	/* the first aggregate inode which describes
261 				 * an inode.  (To fsck this is also the first
262 				 * inode in part 2 of the agg inode table.)
263 				 */
264 
265 /*
266  *	directory configuration
267  */
268 #define JFS_NAME_MAX	255
269 #define JFS_PATH_MAX	BPSIZE
270 
271 
272 /*
273  *	file system state (superblock state)
274  */
275 #define FM_CLEAN 0x00000000	/* file system is unmounted and clean */
276 #define FM_MOUNT 0x00000001	/* file system is mounted cleanly */
277 #define FM_DIRTY 0x00000002	/* file system was not unmounted and clean
278 				 * when mounted or
279 				 * commit failure occurred while being mounted:
280 				 * fsck() must be run to repair
281 				 */
282 #define	FM_LOGREDO 0x00000004	/* log based recovery (logredo()) failed:
283 				 * fsck() must be run to repair
284 				 */
285 #define	FM_EXTENDFS 0x00000008	/* file system extendfs() in progress */
286 #define	FM_STATE_MAX 0x0000000f	/* max value of s_state */
287 
288 #endif				/* _H_JFS_FILSYS */
289