1ccd979bdSMark Fasheh /* -*- mode: c; c-basic-offset: 8; -*- 2ccd979bdSMark Fasheh * vim: noexpandtab sw=8 ts=8 sts=0: 3ccd979bdSMark Fasheh * 4ccd979bdSMark Fasheh * alloc.h 5ccd979bdSMark Fasheh * 6ccd979bdSMark Fasheh * Function prototypes 7ccd979bdSMark Fasheh * 8ccd979bdSMark Fasheh * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9ccd979bdSMark Fasheh * 10ccd979bdSMark Fasheh * This program is free software; you can redistribute it and/or 11ccd979bdSMark Fasheh * modify it under the terms of the GNU General Public 12ccd979bdSMark Fasheh * License as published by the Free Software Foundation; either 13ccd979bdSMark Fasheh * version 2 of the License, or (at your option) any later version. 14ccd979bdSMark Fasheh * 15ccd979bdSMark Fasheh * This program is distributed in the hope that it will be useful, 16ccd979bdSMark Fasheh * but WITHOUT ANY WARRANTY; without even the implied warranty of 17ccd979bdSMark Fasheh * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18ccd979bdSMark Fasheh * General Public License for more details. 19ccd979bdSMark Fasheh * 20ccd979bdSMark Fasheh * You should have received a copy of the GNU General Public 21ccd979bdSMark Fasheh * License along with this program; if not, write to the 22ccd979bdSMark Fasheh * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23ccd979bdSMark Fasheh * Boston, MA 021110-1307, USA. 24ccd979bdSMark Fasheh */ 25ccd979bdSMark Fasheh 26ccd979bdSMark Fasheh #ifndef OCFS2_ALLOC_H 27ccd979bdSMark Fasheh #define OCFS2_ALLOC_H 28ccd979bdSMark Fasheh 29e7d4cb6bSTao Ma 30ca12b7c4STao Ma /* 31ca12b7c4STao Ma * For xattr tree leaf, we limit the leaf byte size to be 64K. 32ca12b7c4STao Ma */ 33ca12b7c4STao Ma #define OCFS2_MAX_XATTR_TREE_LEAF_SIZE 65536 34ca12b7c4STao Ma 35f99b9b7cSJoel Becker /* 36f99b9b7cSJoel Becker * ocfs2_extent_tree and ocfs2_extent_tree_operations are used to abstract 37f99b9b7cSJoel Becker * the b-tree operations in ocfs2. Now all the b-tree operations are not 38f99b9b7cSJoel Becker * limited to ocfs2_dinode only. Any data which need to allocate clusters 39f99b9b7cSJoel Becker * to store can use b-tree. And it only needs to implement its ocfs2_extent_tree 40f99b9b7cSJoel Becker * and operation. 41f99b9b7cSJoel Becker * 42f99b9b7cSJoel Becker * ocfs2_extent_tree becomes the first-class object for extent tree 43f99b9b7cSJoel Becker * manipulation. Callers of the alloc.c code need to fill it via one of 448d6220d6SJoel Becker * the ocfs2_init_*_extent_tree() operations below. 45f99b9b7cSJoel Becker * 46f99b9b7cSJoel Becker * ocfs2_extent_tree contains info for the root of the b-tree, it must have a 47f99b9b7cSJoel Becker * root ocfs2_extent_list and a root_bh so that they can be used in the b-tree 48d9a0a1f8SJoel Becker * functions. It needs the ocfs2_caching_info structure associated with 49d9a0a1f8SJoel Becker * I/O on the tree. With metadata ecc, we now call different journal_access 5013723d00SJoel Becker * functions for each type of metadata, so it must have the 5113723d00SJoel Becker * root_journal_access function. 52f99b9b7cSJoel Becker * ocfs2_extent_tree_operations abstract the normal operations we do for 53f99b9b7cSJoel Becker * the root of extent b-tree. 54f99b9b7cSJoel Becker */ 55f99b9b7cSJoel Becker struct ocfs2_extent_tree_operations; 56f99b9b7cSJoel Becker struct ocfs2_extent_tree { 57f99b9b7cSJoel Becker struct ocfs2_extent_tree_operations *et_ops; 58f99b9b7cSJoel Becker struct buffer_head *et_root_bh; 59f99b9b7cSJoel Becker struct ocfs2_extent_list *et_root_el; 60d9a0a1f8SJoel Becker struct ocfs2_caching_info *et_ci; 6113723d00SJoel Becker ocfs2_journal_access_func et_root_journal_access; 62f99b9b7cSJoel Becker void *et_object; 63f99b9b7cSJoel Becker unsigned int et_max_leaf_clusters; 64f99b9b7cSJoel Becker }; 65f99b9b7cSJoel Becker 66f99b9b7cSJoel Becker /* 678d6220d6SJoel Becker * ocfs2_init_*_extent_tree() will fill an ocfs2_extent_tree from the 688d6220d6SJoel Becker * specified object buffer. 69f99b9b7cSJoel Becker */ 708d6220d6SJoel Becker void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et, 71f56654c4STao Ma struct inode *inode, 72f99b9b7cSJoel Becker struct buffer_head *bh); 738d6220d6SJoel Becker void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et, 74ccd979bdSMark Fasheh struct inode *inode, 75f99b9b7cSJoel Becker struct buffer_head *bh); 762a50a743SJoel Becker struct ocfs2_xattr_value_buf; 778d6220d6SJoel Becker void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et, 78f99b9b7cSJoel Becker struct inode *inode, 792a50a743SJoel Becker struct ocfs2_xattr_value_buf *vb); 809b7895efSMark Fasheh void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et, 819b7895efSMark Fasheh struct inode *inode, 829b7895efSMark Fasheh struct buffer_head *bh); 83f99b9b7cSJoel Becker 845e96581aSJoel Becker /* 855e96581aSJoel Becker * Read an extent block into *bh. If *bh is NULL, a bh will be 865e96581aSJoel Becker * allocated. This is a cached read. The extent block will be validated 875e96581aSJoel Becker * with ocfs2_validate_extent_block(). 885e96581aSJoel Becker */ 893d03a305SJoel Becker int ocfs2_read_extent_block(struct ocfs2_caching_info *ci, u64 eb_blkno, 905e96581aSJoel Becker struct buffer_head **bh); 915e96581aSJoel Becker 92f99b9b7cSJoel Becker struct ocfs2_alloc_context; 93cc79d8c1SJoel Becker int ocfs2_insert_extent(handle_t *handle, 94f99b9b7cSJoel Becker struct ocfs2_extent_tree *et, 95ba492615STao Ma u32 cpos, 96ba492615STao Ma u64 start_blk, 97ba492615STao Ma u32 new_clusters, 98ba492615STao Ma u8 flags, 99ba492615STao Ma struct ocfs2_alloc_context *meta_ac); 100f99b9b7cSJoel Becker 1010eb8d47eSTao Ma enum ocfs2_alloc_restarted { 1020eb8d47eSTao Ma RESTART_NONE = 0, 1030eb8d47eSTao Ma RESTART_TRANS, 1040eb8d47eSTao Ma RESTART_META 1050eb8d47eSTao Ma }; 106cbee7e1aSJoel Becker int ocfs2_add_clusters_in_btree(handle_t *handle, 107cbee7e1aSJoel Becker struct ocfs2_extent_tree *et, 1080eb8d47eSTao Ma u32 *logical_offset, 1090eb8d47eSTao Ma u32 clusters_to_add, 1100eb8d47eSTao Ma int mark_unwritten, 1110eb8d47eSTao Ma struct ocfs2_alloc_context *data_ac, 1120eb8d47eSTao Ma struct ocfs2_alloc_context *meta_ac, 113f99b9b7cSJoel Becker enum ocfs2_alloc_restarted *reason_ret); 114328d5752SMark Fasheh struct ocfs2_cached_dealloc_ctxt; 115f99b9b7cSJoel Becker int ocfs2_mark_extent_written(struct inode *inode, 116f99b9b7cSJoel Becker struct ocfs2_extent_tree *et, 117328d5752SMark Fasheh handle_t *handle, u32 cpos, u32 len, u32 phys, 118328d5752SMark Fasheh struct ocfs2_alloc_context *meta_ac, 119f99b9b7cSJoel Becker struct ocfs2_cached_dealloc_ctxt *dealloc); 120dbdcf6a4SJoel Becker int ocfs2_remove_extent(handle_t *handle, struct ocfs2_extent_tree *et, 121dbdcf6a4SJoel Becker u32 cpos, u32 len, 122063c4561SMark Fasheh struct ocfs2_alloc_context *meta_ac, 123f99b9b7cSJoel Becker struct ocfs2_cached_dealloc_ctxt *dealloc); 124fecc0112SMark Fasheh int ocfs2_remove_btree_range(struct inode *inode, 125fecc0112SMark Fasheh struct ocfs2_extent_tree *et, 126fecc0112SMark Fasheh u32 cpos, u32 phys_cpos, u32 len, 127fecc0112SMark Fasheh struct ocfs2_cached_dealloc_ctxt *dealloc); 128fecc0112SMark Fasheh 129ccd979bdSMark Fasheh int ocfs2_num_free_extents(struct ocfs2_super *osb, 130f99b9b7cSJoel Becker struct ocfs2_extent_tree *et); 131e7d4cb6bSTao Ma 132811f933dSTao Ma /* 133811f933dSTao Ma * how many new metadata chunks would an allocation need at maximum? 134811f933dSTao Ma * 135811f933dSTao Ma * Please note that the caller must make sure that root_el is the root 136811f933dSTao Ma * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise 137811f933dSTao Ma * the result may be wrong. 138811f933dSTao Ma */ 139811f933dSTao Ma static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el) 140ccd979bdSMark Fasheh { 141ccd979bdSMark Fasheh /* 142ccd979bdSMark Fasheh * Rather than do all the work of determining how much we need 143ccd979bdSMark Fasheh * (involves a ton of reads and locks), just ask for the 144ccd979bdSMark Fasheh * maximal limit. That's a tree depth shift. So, one block for 145ccd979bdSMark Fasheh * level of the tree (current l_tree_depth), one block for the 146ccd979bdSMark Fasheh * new tree_depth==0 extent_block, and one block at the new 147ccd979bdSMark Fasheh * top-of-the tree. 148ccd979bdSMark Fasheh */ 149811f933dSTao Ma return le16_to_cpu(root_el->l_tree_depth) + 2; 150ccd979bdSMark Fasheh } 151ccd979bdSMark Fasheh 1525b6a3a2bSMark Fasheh void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di); 1531afc32b9SMark Fasheh void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di); 1541afc32b9SMark Fasheh int ocfs2_convert_inline_data_to_extents(struct inode *inode, 1551afc32b9SMark Fasheh struct buffer_head *di_bh); 1561afc32b9SMark Fasheh 157ccd979bdSMark Fasheh int ocfs2_truncate_log_init(struct ocfs2_super *osb); 158ccd979bdSMark Fasheh void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb); 159ccd979bdSMark Fasheh void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb, 160ccd979bdSMark Fasheh int cancel); 161ccd979bdSMark Fasheh int ocfs2_flush_truncate_log(struct ocfs2_super *osb); 162ccd979bdSMark Fasheh int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb, 163ccd979bdSMark Fasheh int slot_num, 164ccd979bdSMark Fasheh struct ocfs2_dinode **tl_copy); 165ccd979bdSMark Fasheh int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb, 166ccd979bdSMark Fasheh struct ocfs2_dinode *tl_copy); 167063c4561SMark Fasheh int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb); 168063c4561SMark Fasheh int ocfs2_truncate_log_append(struct ocfs2_super *osb, 169063c4561SMark Fasheh handle_t *handle, 170063c4561SMark Fasheh u64 start_blk, 171063c4561SMark Fasheh unsigned int num_clusters); 172063c4561SMark Fasheh int __ocfs2_flush_truncate_log(struct ocfs2_super *osb); 173ccd979bdSMark Fasheh 1742b604351SMark Fasheh /* 1752b604351SMark Fasheh * Process local structure which describes the block unlinks done 1762b604351SMark Fasheh * during an operation. This is populated via 1772b604351SMark Fasheh * ocfs2_cache_block_dealloc(). 1782b604351SMark Fasheh * 1792b604351SMark Fasheh * ocfs2_run_deallocs() should be called after the potentially 1802b604351SMark Fasheh * de-allocating routines. No journal handles should be open, and most 1812b604351SMark Fasheh * locks should have been dropped. 1822b604351SMark Fasheh */ 1832b604351SMark Fasheh struct ocfs2_cached_dealloc_ctxt { 1842b604351SMark Fasheh struct ocfs2_per_slot_free_list *c_first_suballocator; 1852891d290STao Ma struct ocfs2_cached_block_free *c_global_allocator; 1862b604351SMark Fasheh }; 1872b604351SMark Fasheh static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c) 1882b604351SMark Fasheh { 1892b604351SMark Fasheh c->c_first_suballocator = NULL; 1902891d290STao Ma c->c_global_allocator = NULL; 1912b604351SMark Fasheh } 1922891d290STao Ma int ocfs2_cache_cluster_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt, 1932891d290STao Ma u64 blkno, unsigned int bit); 19478f30c31STao Ma static inline int ocfs2_dealloc_has_cluster(struct ocfs2_cached_dealloc_ctxt *c) 19578f30c31STao Ma { 19678f30c31STao Ma return c->c_global_allocator != NULL; 19778f30c31STao Ma } 1982b604351SMark Fasheh int ocfs2_run_deallocs(struct ocfs2_super *osb, 1992b604351SMark Fasheh struct ocfs2_cached_dealloc_ctxt *ctxt); 2002b604351SMark Fasheh 201ccd979bdSMark Fasheh struct ocfs2_truncate_context { 20259a5e416SMark Fasheh struct ocfs2_cached_dealloc_ctxt tc_dealloc; 203ccd979bdSMark Fasheh int tc_ext_alloc_locked; /* is it cluster locked? */ 204ccd979bdSMark Fasheh /* these get destroyed once it's passed to ocfs2_commit_truncate. */ 205ccd979bdSMark Fasheh struct buffer_head *tc_last_eb_bh; 206ccd979bdSMark Fasheh }; 207ccd979bdSMark Fasheh 20835edec1dSMark Fasheh int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle, 20935edec1dSMark Fasheh u64 range_start, u64 range_end); 210ccd979bdSMark Fasheh int ocfs2_prepare_truncate(struct ocfs2_super *osb, 211ccd979bdSMark Fasheh struct inode *inode, 212ccd979bdSMark Fasheh struct buffer_head *fe_bh, 213ccd979bdSMark Fasheh struct ocfs2_truncate_context **tc); 214ccd979bdSMark Fasheh int ocfs2_commit_truncate(struct ocfs2_super *osb, 215ccd979bdSMark Fasheh struct inode *inode, 216ccd979bdSMark Fasheh struct buffer_head *fe_bh, 217ccd979bdSMark Fasheh struct ocfs2_truncate_context *tc); 2181afc32b9SMark Fasheh int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh, 2191afc32b9SMark Fasheh unsigned int start, unsigned int end, int trunc); 220ccd979bdSMark Fasheh 221facdb77fSJoel Becker int ocfs2_find_leaf(struct ocfs2_caching_info *ci, 222facdb77fSJoel Becker struct ocfs2_extent_list *root_el, u32 cpos, 223facdb77fSJoel Becker struct buffer_head **leaf_bh); 224328d5752SMark Fasheh int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster); 225363041a5SMark Fasheh 226e48edee2SMark Fasheh /* 227e48edee2SMark Fasheh * Helper function to look at the # of clusters in an extent record. 228e48edee2SMark Fasheh */ 229e48edee2SMark Fasheh static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el, 230e48edee2SMark Fasheh struct ocfs2_extent_rec *rec) 231e48edee2SMark Fasheh { 232e48edee2SMark Fasheh /* 233e48edee2SMark Fasheh * Cluster count in extent records is slightly different 234e48edee2SMark Fasheh * between interior nodes and leaf nodes. This is to support 235e48edee2SMark Fasheh * unwritten extents which need a flags field in leaf node 236e48edee2SMark Fasheh * records, thus shrinking the available space for a clusters 237e48edee2SMark Fasheh * field. 238e48edee2SMark Fasheh */ 239e48edee2SMark Fasheh if (el->l_tree_depth) 240e48edee2SMark Fasheh return le32_to_cpu(rec->e_int_clusters); 241e48edee2SMark Fasheh else 242e48edee2SMark Fasheh return le16_to_cpu(rec->e_leaf_clusters); 243e48edee2SMark Fasheh } 244e48edee2SMark Fasheh 24500dc417fSMark Fasheh /* 24600dc417fSMark Fasheh * This is only valid for leaf nodes, which are the only ones that can 24700dc417fSMark Fasheh * have empty extents anyway. 24800dc417fSMark Fasheh */ 24900dc417fSMark Fasheh static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec) 25000dc417fSMark Fasheh { 25100dc417fSMark Fasheh return !rec->e_leaf_clusters; 25200dc417fSMark Fasheh } 25300dc417fSMark Fasheh 254ccd979bdSMark Fasheh #endif /* OCFS2_ALLOC_H */ 255