2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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.
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.
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
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).
31 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
32 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
33 #define XFS_AGF_VERSION 1
34 #define XFS_AGI_VERSION 1
36 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
37 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
40 * Btree number 0 is bno, 1 is cnt. This value gives the size of the
43 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1)
46 * The second word of agf_levels in the first a.g. overlaps the EFS
47 * superblock's magic number. Since the magic numbers valid for EFS
48 * are > 64k, our value cannot be confused for an EFS superblock's.
51 typedef struct xfs_agf
{
53 * Common allocation group header information
55 __be32 agf_magicnum
; /* magic number == XFS_AGF_MAGIC */
56 __be32 agf_versionnum
; /* header version == XFS_AGF_VERSION */
57 __be32 agf_seqno
; /* sequence # starting from 0 */
58 __be32 agf_length
; /* size in blocks of a.g. */
60 * Freespace information
62 __be32 agf_roots
[XFS_BTNUM_AGF
]; /* root blocks */
63 __be32 agf_spare0
; /* spare field */
64 __be32 agf_levels
[XFS_BTNUM_AGF
]; /* btree levels */
65 __be32 agf_spare1
; /* spare field */
66 __be32 agf_flfirst
; /* first freelist block's index */
67 __be32 agf_fllast
; /* last freelist block's index */
68 __be32 agf_flcount
; /* count of blocks in freelist */
69 __be32 agf_freeblks
; /* total free blocks */
70 __be32 agf_longest
; /* longest free space */
73 #define XFS_AGF_MAGICNUM 0x00000001
74 #define XFS_AGF_VERSIONNUM 0x00000002
75 #define XFS_AGF_SEQNO 0x00000004
76 #define XFS_AGF_LENGTH 0x00000008
77 #define XFS_AGF_ROOTS 0x00000010
78 #define XFS_AGF_LEVELS 0x00000020
79 #define XFS_AGF_FLFIRST 0x00000040
80 #define XFS_AGF_FLLAST 0x00000080
81 #define XFS_AGF_FLCOUNT 0x00000100
82 #define XFS_AGF_FREEBLKS 0x00000200
83 #define XFS_AGF_LONGEST 0x00000400
84 #define XFS_AGF_NUM_BITS 11
85 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
87 /* disk block (xfs_daddr_t) in the AG */
88 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
89 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
90 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)XFS_BUF_PTR(bp))
94 * Size of the unlinked inode hash table in the agi.
96 #define XFS_AGI_UNLINKED_BUCKETS 64
98 typedef struct xfs_agi
{
100 * Common allocation group header information
102 __be32 agi_magicnum
; /* magic number == XFS_AGI_MAGIC */
103 __be32 agi_versionnum
; /* header version == XFS_AGI_VERSION */
104 __be32 agi_seqno
; /* sequence # starting from 0 */
105 __be32 agi_length
; /* size in blocks of a.g. */
108 * Inodes are mapped by interpreting the inode number, so no
109 * mapping data is needed here.
111 __be32 agi_count
; /* count of allocated inodes */
112 __be32 agi_root
; /* root of inode btree */
113 __be32 agi_level
; /* levels in inode btree */
114 __be32 agi_freecount
; /* number of free inodes */
115 __be32 agi_newino
; /* new inode just allocated */
116 __be32 agi_dirino
; /* last directory inode chunk */
118 * Hash table of inodes which have been unlinked but are
119 * still being referenced.
121 __be32 agi_unlinked
[XFS_AGI_UNLINKED_BUCKETS
];
124 #define XFS_AGI_MAGICNUM 0x00000001
125 #define XFS_AGI_VERSIONNUM 0x00000002
126 #define XFS_AGI_SEQNO 0x00000004
127 #define XFS_AGI_LENGTH 0x00000008
128 #define XFS_AGI_COUNT 0x00000010
129 #define XFS_AGI_ROOT 0x00000020
130 #define XFS_AGI_LEVEL 0x00000040
131 #define XFS_AGI_FREECOUNT 0x00000080
132 #define XFS_AGI_NEWINO 0x00000100
133 #define XFS_AGI_DIRINO 0x00000200
134 #define XFS_AGI_UNLINKED 0x00000400
135 #define XFS_AGI_NUM_BITS 11
136 #define XFS_AGI_ALL_BITS ((1 << XFS_AGI_NUM_BITS) - 1)
138 /* disk block (xfs_daddr_t) in the AG */
139 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
140 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
141 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)XFS_BUF_PTR(bp))
144 * The third a.g. block contains the a.g. freelist, an array
145 * of block pointers to blocks owned by the allocation btree code.
147 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
148 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
149 #define XFS_AGFL_SIZE(mp) ((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t))
150 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)XFS_BUF_PTR(bp))
152 typedef struct xfs_agfl
{
153 xfs_agblock_t agfl_bno
[1]; /* actually XFS_AGFL_SIZE(mp) */
157 * Busy block/extent entry. Used in perag to mark blocks that have been freed
158 * but whose transactions aren't committed to disk yet.
160 typedef struct xfs_perag_busy
{
161 xfs_agblock_t busy_start
;
162 xfs_extlen_t busy_length
;
163 struct xfs_trans
*busy_tp
; /* transaction that did the free */
167 * Per-ag incore structure, copies of information in agf and agi,
168 * to improve the performance of allocation group selection.
170 * pick sizes which fit in allocation buckets well
172 #if (BITS_PER_LONG == 32)
173 #define XFS_PAGB_NUM_SLOTS 84
174 #elif (BITS_PER_LONG == 64)
175 #define XFS_PAGB_NUM_SLOTS 128
178 typedef struct xfs_perag
180 char pagf_init
; /* this agf's entry is initialized */
181 char pagi_init
; /* this agi's entry is initialized */
182 char pagf_metadata
; /* the agf is prefered to be metadata */
183 char pagi_inodeok
; /* The agi is ok for inodes */
184 __uint8_t pagf_levels
[XFS_BTNUM_AGF
];
185 /* # of levels in bno & cnt btree */
186 __uint32_t pagf_flcount
; /* count of blocks in freelist */
187 xfs_extlen_t pagf_freeblks
; /* total free blocks */
188 xfs_extlen_t pagf_longest
; /* longest free space */
189 xfs_agino_t pagi_freecount
; /* number of free inodes */
191 lock_t pagb_lock
; /* lock for pagb_list */
193 int pagb_count
; /* pagb slots in use */
194 xfs_perag_busy_t
*pagb_list
; /* unstable blocks */
197 #define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels)
198 #define XFS_MIN_FREELIST_RAW(bl,cl,mp) \
199 (MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
200 #define XFS_MIN_FREELIST(a,mp) \
201 (XFS_MIN_FREELIST_RAW( \
202 be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \
203 be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp))
204 #define XFS_MIN_FREELIST_PAG(pag,mp) \
205 (XFS_MIN_FREELIST_RAW( \
206 (uint_t)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
207 (uint_t)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp))
209 #define XFS_AGB_TO_FSB(mp,agno,agbno) \
210 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
211 #define XFS_FSB_TO_AGNO(mp,fsbno) \
212 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
213 #define XFS_FSB_TO_AGBNO(mp,fsbno) \
214 ((xfs_agblock_t)((fsbno) & XFS_MASK32LO((mp)->m_sb.sb_agblklog)))
215 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
216 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
217 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
218 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
221 * For checking for bad ranges of xfs_daddr_t's, covering multiple
222 * allocation groups or a single xfs_daddr_t that's a superblock copy.
224 #define XFS_AG_CHECK_DADDR(mp,d,len) \
226 ASSERT((d) == XFS_SB_DADDR || \
227 XFS_DADDR_TO_AGBNO(mp, d) != XFS_SB_DADDR) : \
228 ASSERT(XFS_DADDR_TO_AGNO(mp, d) == \
229 XFS_DADDR_TO_AGNO(mp, (d) + (len) - 1)))
231 #endif /* __XFS_AG_H__ */