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