Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 27 | struct xfs_buf; |
| 28 | struct xfs_mount; |
| 29 | struct 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 Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 35 | |
| 36 | #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) |
| 37 | #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 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 Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 51 | typedef struct xfs_agf { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | /* |
| 53 | * Common allocation group header information |
| 54 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 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. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /* |
| 60 | * Freespace information |
| 61 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 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 */ |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 71 | __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | } 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 Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 85 | #define XFS_AGF_BTREEBLKS 0x00000800 |
| 86 | #define XFS_AGF_NUM_BITS 12 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | #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 Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 91 | #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 Hellwig | 4805621 | 2008-11-28 14:23:38 +1100 | [diff] [blame] | 94 | extern int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, |
| 95 | xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | /* |
| 98 | * Size of the unlinked inode hash table in the agi. |
| 99 | */ |
| 100 | #define XFS_AGI_UNLINKED_BUCKETS 64 |
| 101 | |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 102 | typedef struct xfs_agi { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | /* |
| 104 | * Common allocation group header information |
| 105 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 106 | __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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | /* |
| 111 | * Inode information |
| 112 | * Inodes are mapped by interpreting the inode number, so no |
| 113 | * mapping data is needed here. |
| 114 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 115 | __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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | /* |
| 122 | * Hash table of inodes which have been unlinked but are |
| 123 | * still being referenced. |
| 124 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 125 | __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } 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 Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 144 | #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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Christoph Hellwig | 5e1be0f | 2008-11-28 14:23:37 +1100 | [diff] [blame] | 147 | extern int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp, |
| 148 | xfs_agnumber_t agno, struct xfs_buf **bpp); |
| 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | /* |
| 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 Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 155 | #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | #define XFS_AGFL_SIZE(mp) ((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t)) |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 157 | #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)XFS_BUF_PTR(bp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | typedef struct xfs_agfl { |
Christoph Hellwig | e210100 | 2006-09-28 10:56:51 +1000 | [diff] [blame] | 160 | __be32 agfl_bno[1]; /* actually XFS_AGFL_SIZE(mp) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } 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 | */ |
| 167 | typedef 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 | |
| 185 | typedef 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 Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 189 | char pagf_metadata; /* the agf is preferred to be metadata */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | 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 Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 196 | __uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | xfs_agino_t pagi_freecount; /* number of free inodes */ |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 198 | xfs_agino_t pagi_count; /* number of allocated inodes */ |
| 199 | int pagb_count; /* pagb slots in use */ |
Barry Naujok | 847fff5 | 2008-10-30 17:05:38 +1100 | [diff] [blame] | 200 | xfs_perag_busy_t *pagb_list; /* unstable blocks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | #ifdef __KERNEL__ |
Eric Sandeen | 64137e5 | 2007-10-11 17:38:28 +1000 | [diff] [blame] | 202 | spinlock_t pagb_lock; /* lock for pagb_list */ |
Barry Naujok | 847fff5 | 2008-10-30 17:05:38 +1100 | [diff] [blame] | 203 | |
David Chinner | 2a82b8b | 2007-07-11 11:09:12 +1000 | [diff] [blame] | 204 | atomic_t pagf_fstrms; /* # of filestreams active in this AG */ |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 205 | |
| 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 Naujok | 847fff5 | 2008-10-30 17:05:38 +1100 | [diff] [blame] | 209 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } xfs_perag_t; |
| 211 | |
David Chinner | 396beb8 | 2008-10-30 17:37:26 +1100 | [diff] [blame] | 212 | /* |
| 213 | * tags for inode radix tree |
| 214 | */ |
| 215 | #define XFS_ICI_RECLAIM_TAG 0 /* inode is to be reclaimed */ |
| 216 | |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 217 | #define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | #define XFS_MIN_FREELIST_RAW(bl,cl,mp) \ |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 219 | (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 Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 222 | be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \ |
| 223 | be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp)) |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 224 | #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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 229 | #define XFS_AGB_TO_FSB(mp,agno,agbno) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 231 | #define XFS_FSB_TO_AGNO(mp,fsbno) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 233 | #define XFS_FSB_TO_AGBNO(mp,fsbno) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | ((xfs_agblock_t)((fsbno) & XFS_MASK32LO((mp)->m_sb.sb_agblklog))) |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 235 | #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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | #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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | #endif /* __XFS_AG_H__ */ |