1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * alloc.h 5 * 6 * Function prototypes 7 * 8 * Copyright (C) 2002, 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 OCFS2_ALLOC_H 27 #define OCFS2_ALLOC_H 28 29 enum ocfs2_extent_tree_type { 30 OCFS2_DINODE_EXTENT = 0, 31 }; 32 33 struct ocfs2_alloc_context; 34 int ocfs2_insert_extent(struct ocfs2_super *osb, 35 handle_t *handle, 36 struct inode *inode, 37 struct buffer_head *root_bh, 38 u32 cpos, 39 u64 start_blk, 40 u32 new_clusters, 41 u8 flags, 42 struct ocfs2_alloc_context *meta_ac, 43 enum ocfs2_extent_tree_type et_type); 44 struct ocfs2_cached_dealloc_ctxt; 45 int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh, 46 handle_t *handle, u32 cpos, u32 len, u32 phys, 47 struct ocfs2_alloc_context *meta_ac, 48 struct ocfs2_cached_dealloc_ctxt *dealloc, 49 enum ocfs2_extent_tree_type et_type); 50 int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh, 51 u32 cpos, u32 len, handle_t *handle, 52 struct ocfs2_alloc_context *meta_ac, 53 struct ocfs2_cached_dealloc_ctxt *dealloc, 54 enum ocfs2_extent_tree_type et_type); 55 int ocfs2_num_free_extents(struct ocfs2_super *osb, 56 struct inode *inode, 57 struct buffer_head *root_bh, 58 enum ocfs2_extent_tree_type et_type); 59 60 /* 61 * how many new metadata chunks would an allocation need at maximum? 62 * 63 * Please note that the caller must make sure that root_el is the root 64 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 65 * the result may be wrong. 66 */ 67 static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el) 68 { 69 /* 70 * Rather than do all the work of determining how much we need 71 * (involves a ton of reads and locks), just ask for the 72 * maximal limit. That's a tree depth shift. So, one block for 73 * level of the tree (current l_tree_depth), one block for the 74 * new tree_depth==0 extent_block, and one block at the new 75 * top-of-the tree. 76 */ 77 return le16_to_cpu(root_el->l_tree_depth) + 2; 78 } 79 80 void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di); 81 void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di); 82 int ocfs2_convert_inline_data_to_extents(struct inode *inode, 83 struct buffer_head *di_bh); 84 85 int ocfs2_truncate_log_init(struct ocfs2_super *osb); 86 void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb); 87 void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb, 88 int cancel); 89 int ocfs2_flush_truncate_log(struct ocfs2_super *osb); 90 int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb, 91 int slot_num, 92 struct ocfs2_dinode **tl_copy); 93 int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb, 94 struct ocfs2_dinode *tl_copy); 95 int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb); 96 int ocfs2_truncate_log_append(struct ocfs2_super *osb, 97 handle_t *handle, 98 u64 start_blk, 99 unsigned int num_clusters); 100 int __ocfs2_flush_truncate_log(struct ocfs2_super *osb); 101 102 /* 103 * Process local structure which describes the block unlinks done 104 * during an operation. This is populated via 105 * ocfs2_cache_block_dealloc(). 106 * 107 * ocfs2_run_deallocs() should be called after the potentially 108 * de-allocating routines. No journal handles should be open, and most 109 * locks should have been dropped. 110 */ 111 struct ocfs2_cached_dealloc_ctxt { 112 struct ocfs2_per_slot_free_list *c_first_suballocator; 113 }; 114 static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c) 115 { 116 c->c_first_suballocator = NULL; 117 } 118 int ocfs2_run_deallocs(struct ocfs2_super *osb, 119 struct ocfs2_cached_dealloc_ctxt *ctxt); 120 121 struct ocfs2_truncate_context { 122 struct ocfs2_cached_dealloc_ctxt tc_dealloc; 123 int tc_ext_alloc_locked; /* is it cluster locked? */ 124 /* these get destroyed once it's passed to ocfs2_commit_truncate. */ 125 struct buffer_head *tc_last_eb_bh; 126 }; 127 128 int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle, 129 u64 range_start, u64 range_end); 130 int ocfs2_prepare_truncate(struct ocfs2_super *osb, 131 struct inode *inode, 132 struct buffer_head *fe_bh, 133 struct ocfs2_truncate_context **tc); 134 int ocfs2_commit_truncate(struct ocfs2_super *osb, 135 struct inode *inode, 136 struct buffer_head *fe_bh, 137 struct ocfs2_truncate_context *tc); 138 int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh, 139 unsigned int start, unsigned int end, int trunc); 140 141 int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el, 142 u32 cpos, struct buffer_head **leaf_bh); 143 int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster); 144 145 /* 146 * Helper function to look at the # of clusters in an extent record. 147 */ 148 static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el, 149 struct ocfs2_extent_rec *rec) 150 { 151 /* 152 * Cluster count in extent records is slightly different 153 * between interior nodes and leaf nodes. This is to support 154 * unwritten extents which need a flags field in leaf node 155 * records, thus shrinking the available space for a clusters 156 * field. 157 */ 158 if (el->l_tree_depth) 159 return le32_to_cpu(rec->e_int_clusters); 160 else 161 return le16_to_cpu(rec->e_leaf_clusters); 162 } 163 164 /* 165 * This is only valid for leaf nodes, which are the only ones that can 166 * have empty extents anyway. 167 */ 168 static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec) 169 { 170 return !rec->e_leaf_clusters; 171 } 172 173 #endif /* OCFS2_ALLOC_H */ 174