1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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.
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.
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.
31 * For xattr tree leaf, we limit the leaf byte size to be 64K.
33 #define OCFS2_MAX_XATTR_TREE_LEAF_SIZE 65536
36 * ocfs2_extent_tree and ocfs2_extent_tree_operations are used to abstract
37 * the b-tree operations in ocfs2. Now all the b-tree operations are not
38 * limited to ocfs2_dinode only. Any data which need to allocate clusters
39 * to store can use b-tree. And it only needs to implement its ocfs2_extent_tree
42 * ocfs2_extent_tree becomes the first-class object for extent tree
43 * manipulation. Callers of the alloc.c code need to fill it via one of
44 * the ocfs2_init_*_extent_tree() operations below.
46 * ocfs2_extent_tree contains info for the root of the b-tree, it must have a
47 * root ocfs2_extent_list and a root_bh so that they can be used in the b-tree
49 * ocfs2_extent_tree_operations abstract the normal operations we do for
50 * the root of extent b-tree.
52 struct ocfs2_extent_tree_operations;
53 struct ocfs2_extent_tree {
54 struct ocfs2_extent_tree_operations *et_ops;
55 struct buffer_head *et_root_bh;
56 struct ocfs2_extent_list *et_root_el;
58 unsigned int et_max_leaf_clusters;
62 * ocfs2_init_*_extent_tree() will fill an ocfs2_extent_tree from the
63 * specified object buffer.
65 void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
67 struct buffer_head *bh);
68 void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
70 struct buffer_head *bh);
71 void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
73 struct buffer_head *bh,
74 struct ocfs2_xattr_value_root *xv);
77 * Read an extent block into *bh. If *bh is NULL, a bh will be
78 * allocated. This is a cached read. The extent block will be validated
79 * with ocfs2_validate_extent_block().
81 int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno,
82 struct buffer_head **bh);
84 struct ocfs2_alloc_context;
85 int ocfs2_insert_extent(struct ocfs2_super *osb,
88 struct ocfs2_extent_tree *et,
93 struct ocfs2_alloc_context *meta_ac);
95 enum ocfs2_alloc_restarted {
100 int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
105 struct ocfs2_extent_tree *et,
107 struct ocfs2_alloc_context *data_ac,
108 struct ocfs2_alloc_context *meta_ac,
109 enum ocfs2_alloc_restarted *reason_ret);
110 struct ocfs2_cached_dealloc_ctxt;
111 int ocfs2_mark_extent_written(struct inode *inode,
112 struct ocfs2_extent_tree *et,
113 handle_t *handle, u32 cpos, u32 len, u32 phys,
114 struct ocfs2_alloc_context *meta_ac,
115 struct ocfs2_cached_dealloc_ctxt *dealloc);
116 int ocfs2_remove_extent(struct inode *inode,
117 struct ocfs2_extent_tree *et,
118 u32 cpos, u32 len, handle_t *handle,
119 struct ocfs2_alloc_context *meta_ac,
120 struct ocfs2_cached_dealloc_ctxt *dealloc);
121 int ocfs2_remove_btree_range(struct inode *inode,
122 struct ocfs2_extent_tree *et,
123 u32 cpos, u32 phys_cpos, u32 len,
124 struct ocfs2_cached_dealloc_ctxt *dealloc);
126 int ocfs2_num_free_extents(struct ocfs2_super *osb,
128 struct ocfs2_extent_tree *et);
131 * how many new metadata chunks would an allocation need at maximum?
133 * Please note that the caller must make sure that root_el is the root
134 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
135 * the result may be wrong.
137 static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el)
140 * Rather than do all the work of determining how much we need
141 * (involves a ton of reads and locks), just ask for the
142 * maximal limit. That's a tree depth shift. So, one block for
143 * level of the tree (current l_tree_depth), one block for the
144 * new tree_depth==0 extent_block, and one block at the new
147 return le16_to_cpu(root_el->l_tree_depth) + 2;
150 void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di);
151 void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di);
152 int ocfs2_convert_inline_data_to_extents(struct inode *inode,
153 struct buffer_head *di_bh);
155 int ocfs2_truncate_log_init(struct ocfs2_super *osb);
156 void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb);
157 void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
159 int ocfs2_flush_truncate_log(struct ocfs2_super *osb);
160 int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
162 struct ocfs2_dinode **tl_copy);
163 int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
164 struct ocfs2_dinode *tl_copy);
165 int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb);
166 int ocfs2_truncate_log_append(struct ocfs2_super *osb,
169 unsigned int num_clusters);
170 int __ocfs2_flush_truncate_log(struct ocfs2_super *osb);
173 * Process local structure which describes the block unlinks done
174 * during an operation. This is populated via
175 * ocfs2_cache_block_dealloc().
177 * ocfs2_run_deallocs() should be called after the potentially
178 * de-allocating routines. No journal handles should be open, and most
179 * locks should have been dropped.
181 struct ocfs2_cached_dealloc_ctxt {
182 struct ocfs2_per_slot_free_list *c_first_suballocator;
183 struct ocfs2_cached_block_free *c_global_allocator;
185 static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c)
187 c->c_first_suballocator = NULL;
188 c->c_global_allocator = NULL;
190 int ocfs2_cache_cluster_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
191 u64 blkno, unsigned int bit);
192 static inline int ocfs2_dealloc_has_cluster(struct ocfs2_cached_dealloc_ctxt *c)
194 return c->c_global_allocator != NULL;
196 int ocfs2_run_deallocs(struct ocfs2_super *osb,
197 struct ocfs2_cached_dealloc_ctxt *ctxt);
199 struct ocfs2_truncate_context {
200 struct ocfs2_cached_dealloc_ctxt tc_dealloc;
201 int tc_ext_alloc_locked; /* is it cluster locked? */
202 /* these get destroyed once it's passed to ocfs2_commit_truncate. */
203 struct buffer_head *tc_last_eb_bh;
206 int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
207 u64 range_start, u64 range_end);
208 int ocfs2_prepare_truncate(struct ocfs2_super *osb,
210 struct buffer_head *fe_bh,
211 struct ocfs2_truncate_context **tc);
212 int ocfs2_commit_truncate(struct ocfs2_super *osb,
214 struct buffer_head *fe_bh,
215 struct ocfs2_truncate_context *tc);
216 int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
217 unsigned int start, unsigned int end, int trunc);
219 int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
220 u32 cpos, struct buffer_head **leaf_bh);
221 int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster);
224 * Helper function to look at the # of clusters in an extent record.
226 static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el,
227 struct ocfs2_extent_rec *rec)
230 * Cluster count in extent records is slightly different
231 * between interior nodes and leaf nodes. This is to support
232 * unwritten extents which need a flags field in leaf node
233 * records, thus shrinking the available space for a clusters
236 if (el->l_tree_depth)
237 return le32_to_cpu(rec->e_int_clusters);
239 return le16_to_cpu(rec->e_leaf_clusters);
243 * This is only valid for leaf nodes, which are the only ones that can
244 * have empty extents anyway.
246 static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec)
248 return !rec->e_leaf_clusters;
251 #endif /* OCFS2_ALLOC_H */