projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
| 3 | * | |
| 4 | * suballoc.h | |
| 5 | * | |
| 6 | * Defines sub allocator api | |
| 7 | * | |
| 8 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or | |
| 11 | * modify it under the terms of the GNU General Public | |
| 12 | * License as published by the Free Software Foundation; either | |
| 13 | * version 2 of the License, or (at your option) any later version. | |
| 14 | * | |
| 15 | * This program is distributed in the hope that it will be useful, | |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 18 | * General Public License for more details. | |
| 19 | * | |
| 20 | * You should have received a copy of the GNU General Public | |
| 21 | * License along with this program; if not, write to the | |
| 22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 23 | * Boston, MA 021110-1307, USA. | |
| 24 | */ | |
| 25 | ||
| 26 | #ifndef _CHAINALLOC_H_ | |
| 27 | #define _CHAINALLOC_H_ | |
| 28 | ||
| 29 | typedef int (group_search_t)(struct inode *, | |
| 30 | struct buffer_head *, | |
| 31 | u32, | |
| 32 | u32, | |
| 33 | u16 *, | |
| 34 | u16 *); | |
| 35 | ||
| 36 | struct ocfs2_alloc_context { | |
| 37 | struct inode *ac_inode; /* which bitmap are we allocating from? */ | |
| 38 | struct buffer_head *ac_bh; /* file entry bh */ | |
| 39 | u32 ac_bits_wanted; | |
| 40 | u32 ac_bits_given; | |
| 41 | #define OCFS2_AC_USE_LOCAL 1 | |
| 42 | #define OCFS2_AC_USE_MAIN 2 | |
| 43 | #define OCFS2_AC_USE_INODE 3 | |
| 44 | #define OCFS2_AC_USE_META 4 | |
| 45 | u32 ac_which; | |
| ccd979bd MF |
46 | |
| 47 | /* these are used by the chain search */ | |
| 48 | u16 ac_chain; | |
| 49 | int ac_allow_chain_relink; | |
| 50 | group_search_t *ac_group_search; | |
| 883d4cae MF |
51 | |
| 52 | u64 ac_last_group; | |
| ccd979bd MF |
53 | }; |
| 54 | ||
| 55 | void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); | |
| 56 | static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) | |
| 57 | { | |
| 58 | return ac->ac_bits_wanted - ac->ac_bits_given; | |
| 59 | } | |
| 60 | ||
| 61 | int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, | |
| ccd979bd MF |
62 | struct ocfs2_dinode *fe, |
| 63 | struct ocfs2_alloc_context **ac); | |
| 64 | int ocfs2_reserve_new_inode(struct ocfs2_super *osb, | |
| ccd979bd MF |
65 | struct ocfs2_alloc_context **ac); |
| 66 | int ocfs2_reserve_clusters(struct ocfs2_super *osb, | |
| ccd979bd MF |
67 | u32 bits_wanted, |
| 68 | struct ocfs2_alloc_context **ac); | |
| 69 | ||
| 70 | int ocfs2_claim_metadata(struct ocfs2_super *osb, | |
| 1fabe148 | 71 | handle_t *handle, |
| ccd979bd MF |
72 | struct ocfs2_alloc_context *ac, |
| 73 | u32 bits_wanted, | |
| 74 | u16 *suballoc_bit_start, | |
| 75 | u32 *num_bits, | |
| 76 | u64 *blkno_start); | |
| 77 | int ocfs2_claim_new_inode(struct ocfs2_super *osb, | |
| 1fabe148 | 78 | handle_t *handle, |
| ccd979bd MF |
79 | struct ocfs2_alloc_context *ac, |
| 80 | u16 *suballoc_bit, | |
| 81 | u64 *fe_blkno); | |
| 82 | int ocfs2_claim_clusters(struct ocfs2_super *osb, | |
| 1fabe148 | 83 | handle_t *handle, |
| ccd979bd MF |
84 | struct ocfs2_alloc_context *ac, |
| 85 | u32 min_clusters, | |
| 86 | u32 *cluster_start, | |
| 87 | u32 *num_clusters); | |
| 88 | ||
| 2b604351 MF |
89 | int ocfs2_free_suballoc_bits(handle_t *handle, |
| 90 | struct inode *alloc_inode, | |
| 91 | struct buffer_head *alloc_bh, | |
| 92 | unsigned int start_bit, | |
| 93 | u64 bg_blkno, | |
| 94 | unsigned int count); | |
| 1fabe148 | 95 | int ocfs2_free_dinode(handle_t *handle, |
| ccd979bd MF |
96 | struct inode *inode_alloc_inode, |
| 97 | struct buffer_head *inode_alloc_bh, | |
| 98 | struct ocfs2_dinode *di); | |
| 1fabe148 | 99 | int ocfs2_free_clusters(handle_t *handle, |
| ccd979bd MF |
100 | struct inode *bitmap_inode, |
| 101 | struct buffer_head *bitmap_bh, | |
| 102 | u64 start_blk, | |
| 103 | unsigned int num_clusters); | |
| 104 | ||
| 2b604351 MF |
105 | static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) |
| 106 | { | |
| 107 | u64 group = block - (u64) bit; | |
| 108 | ||
| 109 | return group; | |
| 110 | } | |
| 111 | ||
| ccd979bd MF |
112 | static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, |
| 113 | u64 bg_blkno) | |
| 114 | { | |
| 115 | /* This should work for all block group descriptors as only | |
| 116 | * the 1st group descriptor of the cluster bitmap is | |
| 117 | * different. */ | |
| 118 | ||
| 119 | if (bg_blkno == osb->first_cluster_group_blkno) | |
| 120 | return 0; | |
| 121 | ||
| 122 | /* the rest of the block groups are located at the beginning | |
| 123 | * of their 1st cluster, so a direct translation just | |
| 124 | * works. */ | |
| 125 | return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); | |
| 126 | } | |
| 127 | ||
| 128 | static inline int ocfs2_is_cluster_bitmap(struct inode *inode) | |
| 129 | { | |
| 130 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
| 131 | return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; | |
| 132 | } | |
| 133 | ||
| 134 | /* This is for local alloc ONLY. Others should use the task-specific | |
| 135 | * apis above. */ | |
| 136 | int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, | |
| 137 | struct ocfs2_alloc_context *ac); | |
| 138 | ||
| 139 | #endif /* _CHAINALLOC_H_ */ |