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  1/*
  2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
  3 * All Rights Reserved.
  4 *
  5 * This program is free software; you can redistribute it and/or
  6 * modify it under the terms of the GNU General Public License as
  7 * published by the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it would be useful,
 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12 * 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 the Free Software Foundation,
 16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17 */
 18#ifndef __XFS_AG_H__
 19#define	__XFS_AG_H__
 20
 21/*
 22 * Allocation group header
 23 * This is divided into three structures, placed in sequential 512-byte
 24 * buffers after a copy of the superblock (also in a 512-byte buffer).
 25 */
 26
 27struct xfs_buf;
 28struct xfs_mount;
 29struct xfs_trans;
 30
 31#define	XFS_AGF_MAGIC	0x58414746	/* 'XAGF' */
 32#define	XFS_AGI_MAGIC	0x58414749	/* 'XAGI' */
 33#define	XFS_AGFL_MAGIC	0x5841464c	/* 'XAFL' */
 34#define	XFS_AGF_VERSION	1
 35#define	XFS_AGI_VERSION	1
 36
 37#define	XFS_AGF_GOOD_VERSION(v)	((v) == XFS_AGF_VERSION)
 38#define	XFS_AGI_GOOD_VERSION(v)	((v) == XFS_AGI_VERSION)
 39
 40/*
 41 * Btree number 0 is bno, 1 is cnt.  This value gives the size of the
 42 * arrays below.
 43 */
 44#define	XFS_BTNUM_AGF	((int)XFS_BTNUM_CNTi + 1)
 45
 46/*
 47 * The second word of agf_levels in the first a.g. overlaps the EFS
 48 * superblock's magic number.  Since the magic numbers valid for EFS
 49 * are > 64k, our value cannot be confused for an EFS superblock's.
 50 */
 51
 52typedef struct xfs_agf {
 53	/*
 54	 * Common allocation group header information
 55	 */
 56	__be32		agf_magicnum;	/* magic number == XFS_AGF_MAGIC */
 57	__be32		agf_versionnum;	/* header version == XFS_AGF_VERSION */
 58	__be32		agf_seqno;	/* sequence # starting from 0 */
 59	__be32		agf_length;	/* size in blocks of a.g. */
 60	/*
 61	 * Freespace information
 62	 */
 63	__be32		agf_roots[XFS_BTNUM_AGF];	/* root blocks */
 64	__be32		agf_spare0;	/* spare field */
 65	__be32		agf_levels[XFS_BTNUM_AGF];	/* btree levels */
 66	__be32		agf_spare1;	/* spare field */
 67
 68	__be32		agf_flfirst;	/* first freelist block's index */
 69	__be32		agf_fllast;	/* last freelist block's index */
 70	__be32		agf_flcount;	/* count of blocks in freelist */
 71	__be32		agf_freeblks;	/* total free blocks */
 72
 73	__be32		agf_longest;	/* longest free space */
 74	__be32		agf_btreeblks;	/* # of blocks held in AGF btrees */
 75	uuid_t		agf_uuid;	/* uuid of filesystem */
 76
 77	/*
 78	 * reserve some contiguous space for future logged fields before we add
 79	 * the unlogged fields. This makes the range logging via flags and
 80	 * structure offsets much simpler.
 81	 */
 82	__be64		agf_spare64[16];
 83
 84	/* unlogged fields, written during buffer writeback. */
 85	__be64		agf_lsn;	/* last write sequence */
 86	__be32		agf_crc;	/* crc of agf sector */
 87	__be32		agf_spare2;
 88
 89	/* structure must be padded to 64 bit alignment */
 90} xfs_agf_t;
 91
 92#define XFS_AGF_CRC_OFF		offsetof(struct xfs_agf, agf_crc)
 93
 94#define	XFS_AGF_MAGICNUM	0x00000001
 95#define	XFS_AGF_VERSIONNUM	0x00000002
 96#define	XFS_AGF_SEQNO		0x00000004
 97#define	XFS_AGF_LENGTH		0x00000008
 98#define	XFS_AGF_ROOTS		0x00000010
 99#define	XFS_AGF_LEVELS		0x00000020
100#define	XFS_AGF_FLFIRST		0x00000040
101#define	XFS_AGF_FLLAST		0x00000080
102#define	XFS_AGF_FLCOUNT		0x00000100
103#define	XFS_AGF_FREEBLKS	0x00000200
104#define	XFS_AGF_LONGEST		0x00000400
105#define	XFS_AGF_BTREEBLKS	0x00000800
106#define	XFS_AGF_UUID		0x00001000
107#define	XFS_AGF_NUM_BITS	13
108#define	XFS_AGF_ALL_BITS	((1 << XFS_AGF_NUM_BITS) - 1)
109
110#define XFS_AGF_FLAGS \
111	{ XFS_AGF_MAGICNUM,	"MAGICNUM" }, \
112	{ XFS_AGF_VERSIONNUM,	"VERSIONNUM" }, \
113	{ XFS_AGF_SEQNO,	"SEQNO" }, \
114	{ XFS_AGF_LENGTH,	"LENGTH" }, \
115	{ XFS_AGF_ROOTS,	"ROOTS" }, \
116	{ XFS_AGF_LEVELS,	"LEVELS" }, \
117	{ XFS_AGF_FLFIRST,	"FLFIRST" }, \
118	{ XFS_AGF_FLLAST,	"FLLAST" }, \
119	{ XFS_AGF_FLCOUNT,	"FLCOUNT" }, \
120	{ XFS_AGF_FREEBLKS,	"FREEBLKS" }, \
121	{ XFS_AGF_LONGEST,	"LONGEST" }, \
122	{ XFS_AGF_BTREEBLKS,	"BTREEBLKS" }, \
123	{ XFS_AGF_UUID,		"UUID" }
124
125/* disk block (xfs_daddr_t) in the AG */
126#define XFS_AGF_DADDR(mp)	((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
127#define	XFS_AGF_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
128#define	XFS_BUF_TO_AGF(bp)	((xfs_agf_t *)((bp)->b_addr))
129
130extern int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
131			xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
132
133/*
134 * Size of the unlinked inode hash table in the agi.
135 */
136#define	XFS_AGI_UNLINKED_BUCKETS	64
137
138typedef struct xfs_agi {
139	/*
140	 * Common allocation group header information
141	 */
142	__be32		agi_magicnum;	/* magic number == XFS_AGI_MAGIC */
143	__be32		agi_versionnum;	/* header version == XFS_AGI_VERSION */
144	__be32		agi_seqno;	/* sequence # starting from 0 */
145	__be32		agi_length;	/* size in blocks of a.g. */
146	/*
147	 * Inode information
148	 * Inodes are mapped by interpreting the inode number, so no
149	 * mapping data is needed here.
150	 */
151	__be32		agi_count;	/* count of allocated inodes */
152	__be32		agi_root;	/* root of inode btree */
153	__be32		agi_level;	/* levels in inode btree */
154	__be32		agi_freecount;	/* number of free inodes */
155
156	__be32		agi_newino;	/* new inode just allocated */
157	__be32		agi_dirino;	/* last directory inode chunk */
158	/*
159	 * Hash table of inodes which have been unlinked but are
160	 * still being referenced.
161	 */
162	__be32		agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
163
164	uuid_t		agi_uuid;	/* uuid of filesystem */
165	__be32		agi_crc;	/* crc of agi sector */
166	__be32		agi_pad32;
167	__be64		agi_lsn;	/* last write sequence */
168
169	/* structure must be padded to 64 bit alignment */
170} xfs_agi_t;
171
172#define XFS_AGI_CRC_OFF		offsetof(struct xfs_agi, agi_crc)
173
174#define	XFS_AGI_MAGICNUM	0x00000001
175#define	XFS_AGI_VERSIONNUM	0x00000002
176#define	XFS_AGI_SEQNO		0x00000004
177#define	XFS_AGI_LENGTH		0x00000008
178#define	XFS_AGI_COUNT		0x00000010
179#define	XFS_AGI_ROOT		0x00000020
180#define	XFS_AGI_LEVEL		0x00000040
181#define	XFS_AGI_FREECOUNT	0x00000080
182#define	XFS_AGI_NEWINO		0x00000100
183#define	XFS_AGI_DIRINO		0x00000200
184#define	XFS_AGI_UNLINKED	0x00000400
185#define	XFS_AGI_NUM_BITS	11
186#define	XFS_AGI_ALL_BITS	((1 << XFS_AGI_NUM_BITS) - 1)
187
188/* disk block (xfs_daddr_t) in the AG */
189#define XFS_AGI_DADDR(mp)	((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
190#define	XFS_AGI_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
191#define	XFS_BUF_TO_AGI(bp)	((xfs_agi_t *)((bp)->b_addr))
192
193extern int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,
194				xfs_agnumber_t agno, struct xfs_buf **bpp);
195
196/*
197 * The third a.g. block contains the a.g. freelist, an array
198 * of block pointers to blocks owned by the allocation btree code.
199 */
200#define XFS_AGFL_DADDR(mp)	((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
201#define	XFS_AGFL_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
202#define	XFS_BUF_TO_AGFL(bp)	((xfs_agfl_t *)((bp)->b_addr))
203
204#define XFS_BUF_TO_AGFL_BNO(mp, bp) \
205	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
206		&(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
207		(__be32 *)(bp)->b_addr)
208
209/*
210 * Size of the AGFL.  For CRC-enabled filesystes we steal a couple of
211 * slots in the beginning of the block for a proper header with the
212 * location information and CRC.
213 */
214#define XFS_AGFL_SIZE(mp) \
215	(((mp)->m_sb.sb_sectsize - \
216	 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
217		sizeof(struct xfs_agfl) : 0)) / \
218	  sizeof(xfs_agblock_t))
219
220typedef struct xfs_agfl {
221	__be32		agfl_magicnum;
222	__be32		agfl_seqno;
223	uuid_t		agfl_uuid;
224	__be64		agfl_lsn;
225	__be32		agfl_crc;
226	__be32		agfl_bno[];	/* actually XFS_AGFL_SIZE(mp) */
227} xfs_agfl_t;
228
229#define XFS_AGFL_CRC_OFF	offsetof(struct xfs_agfl, agfl_crc)
230
231/*
232 * tags for inode radix tree
233 */
234#define XFS_ICI_NO_TAG		(-1)	/* special flag for an untagged lookup
235					   in xfs_inode_ag_iterator */
236#define XFS_ICI_RECLAIM_TAG	0	/* inode is to be reclaimed */
237#define XFS_ICI_EOFBLOCKS_TAG	1	/* inode has blocks beyond EOF */
238
239#define	XFS_AG_MAXLEVELS(mp)		((mp)->m_ag_maxlevels)
240#define	XFS_MIN_FREELIST_RAW(bl,cl,mp)	\
241	(MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
242#define	XFS_MIN_FREELIST(a,mp)		\
243	(XFS_MIN_FREELIST_RAW(		\
244		be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \
245		be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp))
246#define	XFS_MIN_FREELIST_PAG(pag,mp)	\
247	(XFS_MIN_FREELIST_RAW(		\
248		(unsigned int)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
249		(unsigned int)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp))
250
251#define XFS_AGB_TO_FSB(mp,agno,agbno)	\
252	(((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
253#define	XFS_FSB_TO_AGNO(mp,fsbno)	\
254	((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
255#define	XFS_FSB_TO_AGBNO(mp,fsbno)	\
256	((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
257#define	XFS_AGB_TO_DADDR(mp,agno,agbno)	\
258	((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
259		(xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
260#define	XFS_AG_DADDR(mp,agno,d)		(XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
261
262/*
263 * For checking for bad ranges of xfs_daddr_t's, covering multiple
264 * allocation groups or a single xfs_daddr_t that's a superblock copy.
265 */
266#define	XFS_AG_CHECK_DADDR(mp,d,len)	\
267	((len) == 1 ? \
268	    ASSERT((d) == XFS_SB_DADDR || \
269		   xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
270	    ASSERT(xfs_daddr_to_agno(mp, d) == \
271		   xfs_daddr_to_agno(mp, (d) + (len) - 1)))
272
273#endif	/* __XFS_AG_H__ */