| 1 | /* |
| 2 | * Copyright (c) 2000,2005 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_IALLOC_BTREE_H__ |
| 19 | #define __XFS_IALLOC_BTREE_H__ |
| 20 | |
| 21 | /* |
| 22 | * Inode map on-disk structures |
| 23 | */ |
| 24 | |
| 25 | struct xfs_buf; |
| 26 | struct xfs_btree_cur; |
| 27 | struct xfs_mount; |
| 28 | |
| 29 | /* |
| 30 | * There is a btree for the inode map per allocation group. |
| 31 | */ |
| 32 | #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ |
| 33 | #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ |
| 34 | |
| 35 | typedef __uint64_t xfs_inofree_t; |
| 36 | #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) |
| 37 | #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) |
| 38 | #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) |
| 39 | #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) |
| 40 | |
| 41 | static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) |
| 42 | { |
| 43 | return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; |
| 44 | } |
| 45 | |
| 46 | /* |
| 47 | * Data record structure |
| 48 | */ |
| 49 | typedef struct xfs_inobt_rec { |
| 50 | __be32 ir_startino; /* starting inode number */ |
| 51 | __be32 ir_freecount; /* count of free inodes (set bits) */ |
| 52 | __be64 ir_free; /* free inode mask */ |
| 53 | } xfs_inobt_rec_t; |
| 54 | |
| 55 | typedef struct xfs_inobt_rec_incore { |
| 56 | xfs_agino_t ir_startino; /* starting inode number */ |
| 57 | __int32_t ir_freecount; /* count of free inodes (set bits) */ |
| 58 | xfs_inofree_t ir_free; /* free inode mask */ |
| 59 | } xfs_inobt_rec_incore_t; |
| 60 | |
| 61 | |
| 62 | /* |
| 63 | * Key structure |
| 64 | */ |
| 65 | typedef struct xfs_inobt_key { |
| 66 | __be32 ir_startino; /* starting inode number */ |
| 67 | } xfs_inobt_key_t; |
| 68 | |
| 69 | /* btree pointer type */ |
| 70 | typedef __be32 xfs_inobt_ptr_t; |
| 71 | |
| 72 | /* |
| 73 | * block numbers in the AG. |
| 74 | */ |
| 75 | #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) |
| 76 | #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) |
| 77 | |
| 78 | /* |
| 79 | * Btree block header size depends on a superblock flag. |
| 80 | */ |
| 81 | #define XFS_INOBT_BLOCK_LEN(mp) \ |
| 82 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ |
| 83 | XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN) |
| 84 | |
| 85 | /* |
| 86 | * Record, key, and pointer address macros for btree blocks. |
| 87 | * |
| 88 | * (note that some of these may appear unused, but they are used in userspace) |
| 89 | */ |
| 90 | #define XFS_INOBT_REC_ADDR(mp, block, index) \ |
| 91 | ((xfs_inobt_rec_t *) \ |
| 92 | ((char *)(block) + \ |
| 93 | XFS_INOBT_BLOCK_LEN(mp) + \ |
| 94 | (((index) - 1) * sizeof(xfs_inobt_rec_t)))) |
| 95 | |
| 96 | #define XFS_INOBT_KEY_ADDR(mp, block, index) \ |
| 97 | ((xfs_inobt_key_t *) \ |
| 98 | ((char *)(block) + \ |
| 99 | XFS_INOBT_BLOCK_LEN(mp) + \ |
| 100 | ((index) - 1) * sizeof(xfs_inobt_key_t))) |
| 101 | |
| 102 | #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \ |
| 103 | ((xfs_inobt_ptr_t *) \ |
| 104 | ((char *)(block) + \ |
| 105 | XFS_INOBT_BLOCK_LEN(mp) + \ |
| 106 | (maxrecs) * sizeof(xfs_inobt_key_t) + \ |
| 107 | ((index) - 1) * sizeof(xfs_inobt_ptr_t))) |
| 108 | |
| 109 | extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *, |
| 110 | struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t); |
| 111 | extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int); |
| 112 | |
| 113 | extern const struct xfs_buf_ops xfs_inobt_buf_ops; |
| 114 | |
| 115 | #endif /* __XFS_IALLOC_BTREE_H__ */ |