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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
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_AGF_VERSION 1
34#define XFS_AGI_VERSION 1
Nathan Scotta844f452005-11-02 14:38:42 +110035
36#define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
37#define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39/*
40 * Btree number 0 is bno, 1 is cnt. This value gives the size of the
41 * arrays below.
42 */
43#define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1)
44
45/*
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.
49 */
50
Christoph Hellwig16259e72005-11-02 15:11:25 +110051typedef struct xfs_agf {
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 /*
53 * Common allocation group header information
54 */
Christoph Hellwig16259e72005-11-02 15:11:25 +110055 __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. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 /*
60 * Freespace information
61 */
Christoph Hellwig16259e72005-11-02 15:11:25 +110062 __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 */
David Chinner92821e22007-05-24 15:26:31 +100071 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */
Linus Torvalds1da177e2005-04-16 15:20:36 -070072} xfs_agf_t;
73
74#define XFS_AGF_MAGICNUM 0x00000001
75#define XFS_AGF_VERSIONNUM 0x00000002
76#define XFS_AGF_SEQNO 0x00000004
77#define XFS_AGF_LENGTH 0x00000008
78#define XFS_AGF_ROOTS 0x00000010
79#define XFS_AGF_LEVELS 0x00000020
80#define XFS_AGF_FLFIRST 0x00000040
81#define XFS_AGF_FLLAST 0x00000080
82#define XFS_AGF_FLCOUNT 0x00000100
83#define XFS_AGF_FREEBLKS 0x00000200
84#define XFS_AGF_LONGEST 0x00000400
David Chinner92821e22007-05-24 15:26:31 +100085#define XFS_AGF_BTREEBLKS 0x00000800
86#define XFS_AGF_NUM_BITS 12
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
88
89/* disk block (xfs_daddr_t) in the AG */
90#define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
Nathan Scotta844f452005-11-02 14:38:42 +110091#define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
92#define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)XFS_BUF_PTR(bp))
93
From: Christoph Hellwig48056212008-11-28 14:23:38 +110094extern int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
95 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97/*
98 * Size of the unlinked inode hash table in the agi.
99 */
100#define XFS_AGI_UNLINKED_BUCKETS 64
101
Christoph Hellwig16259e72005-11-02 15:11:25 +1100102typedef struct xfs_agi {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 /*
104 * Common allocation group header information
105 */
Christoph Hellwig16259e72005-11-02 15:11:25 +1100106 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
107 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
108 __be32 agi_seqno; /* sequence # starting from 0 */
109 __be32 agi_length; /* size in blocks of a.g. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 /*
111 * Inode information
112 * Inodes are mapped by interpreting the inode number, so no
113 * mapping data is needed here.
114 */
Christoph Hellwig16259e72005-11-02 15:11:25 +1100115 __be32 agi_count; /* count of allocated inodes */
116 __be32 agi_root; /* root of inode btree */
117 __be32 agi_level; /* levels in inode btree */
118 __be32 agi_freecount; /* number of free inodes */
119 __be32 agi_newino; /* new inode just allocated */
120 __be32 agi_dirino; /* last directory inode chunk */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 /*
122 * Hash table of inodes which have been unlinked but are
123 * still being referenced.
124 */
Christoph Hellwig16259e72005-11-02 15:11:25 +1100125 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126} xfs_agi_t;
127
128#define XFS_AGI_MAGICNUM 0x00000001
129#define XFS_AGI_VERSIONNUM 0x00000002
130#define XFS_AGI_SEQNO 0x00000004
131#define XFS_AGI_LENGTH 0x00000008
132#define XFS_AGI_COUNT 0x00000010
133#define XFS_AGI_ROOT 0x00000020
134#define XFS_AGI_LEVEL 0x00000040
135#define XFS_AGI_FREECOUNT 0x00000080
136#define XFS_AGI_NEWINO 0x00000100
137#define XFS_AGI_DIRINO 0x00000200
138#define XFS_AGI_UNLINKED 0x00000400
139#define XFS_AGI_NUM_BITS 11
140#define XFS_AGI_ALL_BITS ((1 << XFS_AGI_NUM_BITS) - 1)
141
142/* disk block (xfs_daddr_t) in the AG */
143#define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
Nathan Scotta844f452005-11-02 14:38:42 +1100144#define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
145#define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)XFS_BUF_PTR(bp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +1100147extern int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,
148 xfs_agnumber_t agno, struct xfs_buf **bpp);
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150/*
151 * The third a.g. block contains the a.g. freelist, an array
152 * of block pointers to blocks owned by the allocation btree code.
153 */
154#define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
Nathan Scotta844f452005-11-02 14:38:42 +1100155#define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156#define XFS_AGFL_SIZE(mp) ((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t))
Nathan Scotta844f452005-11-02 14:38:42 +1100157#define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)XFS_BUF_PTR(bp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159typedef struct xfs_agfl {
Christoph Hellwige2101002006-09-28 10:56:51 +1000160 __be32 agfl_bno[1]; /* actually XFS_AGFL_SIZE(mp) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161} xfs_agfl_t;
162
163/*
164 * Busy block/extent entry. Used in perag to mark blocks that have been freed
165 * but whose transactions aren't committed to disk yet.
166 */
167typedef struct xfs_perag_busy {
168 xfs_agblock_t busy_start;
169 xfs_extlen_t busy_length;
170 struct xfs_trans *busy_tp; /* transaction that did the free */
171} xfs_perag_busy_t;
172
173/*
174 * Per-ag incore structure, copies of information in agf and agi,
175 * to improve the performance of allocation group selection.
176 *
177 * pick sizes which fit in allocation buckets well
178 */
179#if (BITS_PER_LONG == 32)
180#define XFS_PAGB_NUM_SLOTS 84
181#elif (BITS_PER_LONG == 64)
182#define XFS_PAGB_NUM_SLOTS 128
183#endif
184
185typedef struct xfs_perag
186{
187 char pagf_init; /* this agf's entry is initialized */
188 char pagi_init; /* this agi's entry is initialized */
Nathan Scottc41564b2006-03-29 08:55:14 +1000189 char pagf_metadata; /* the agf is preferred to be metadata */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 char pagi_inodeok; /* The agi is ok for inodes */
191 __uint8_t pagf_levels[XFS_BTNUM_AGF];
192 /* # of levels in bno & cnt btree */
193 __uint32_t pagf_flcount; /* count of blocks in freelist */
194 xfs_extlen_t pagf_freeblks; /* total free blocks */
195 xfs_extlen_t pagf_longest; /* longest free space */
David Chinner92821e22007-05-24 15:26:31 +1000196 __uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 xfs_agino_t pagi_freecount; /* number of free inodes */
David Chinner92821e22007-05-24 15:26:31 +1000198 xfs_agino_t pagi_count; /* number of allocated inodes */
199 int pagb_count; /* pagb slots in use */
Barry Naujok847fff52008-10-30 17:05:38 +1100200 xfs_perag_busy_t *pagb_list; /* unstable blocks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201#ifdef __KERNEL__
Eric Sandeen64137e52007-10-11 17:38:28 +1000202 spinlock_t pagb_lock; /* lock for pagb_list */
Barry Naujok847fff52008-10-30 17:05:38 +1100203
David Chinner2a82b8b2007-07-11 11:09:12 +1000204 atomic_t pagf_fstrms; /* # of filestreams active in this AG */
David Chinnerda353b02007-08-28 14:00:13 +1000205
206 int pag_ici_init; /* incore inode cache initialised */
207 rwlock_t pag_ici_lock; /* incore inode lock */
208 struct radix_tree_root pag_ici_root; /* incore inode cache root */
Barry Naujok847fff52008-10-30 17:05:38 +1100209#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210} xfs_perag_t;
211
David Chinner396beb82008-10-30 17:37:26 +1100212/*
213 * tags for inode radix tree
214 */
215#define XFS_ICI_RECLAIM_TAG 0 /* inode is to be reclaimed */
216
Nathan Scotta844f452005-11-02 14:38:42 +1100217#define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218#define XFS_MIN_FREELIST_RAW(bl,cl,mp) \
Nathan Scotta844f452005-11-02 14:38:42 +1100219 (MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
220#define XFS_MIN_FREELIST(a,mp) \
221 (XFS_MIN_FREELIST_RAW( \
Christoph Hellwig16259e72005-11-02 15:11:25 +1100222 be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \
223 be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp))
Nathan Scotta844f452005-11-02 14:38:42 +1100224#define XFS_MIN_FREELIST_PAG(pag,mp) \
225 (XFS_MIN_FREELIST_RAW( \
226 (uint_t)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
227 (uint_t)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Nathan Scotta844f452005-11-02 14:38:42 +1100229#define XFS_AGB_TO_FSB(mp,agno,agbno) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
Nathan Scotta844f452005-11-02 14:38:42 +1100231#define XFS_FSB_TO_AGNO(mp,fsbno) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
Nathan Scotta844f452005-11-02 14:38:42 +1100233#define XFS_FSB_TO_AGBNO(mp,fsbno) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 ((xfs_agblock_t)((fsbno) & XFS_MASK32LO((mp)->m_sb.sb_agblklog)))
Nathan Scotta844f452005-11-02 14:38:42 +1100235#define XFS_AGB_TO_DADDR(mp,agno,agbno) \
236 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
237 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
238#define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240/*
241 * For checking for bad ranges of xfs_daddr_t's, covering multiple
242 * allocation groups or a single xfs_daddr_t that's a superblock copy.
243 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244#define XFS_AG_CHECK_DADDR(mp,d,len) \
245 ((len) == 1 ? \
246 ASSERT((d) == XFS_SB_DADDR || \
247 XFS_DADDR_TO_AGBNO(mp, d) != XFS_SB_DADDR) : \
248 ASSERT(XFS_DADDR_TO_AGNO(mp, d) == \
249 XFS_DADDR_TO_AGNO(mp, (d) + (len) - 1)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251#endif /* __XFS_AG_H__ */