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.
29 enum ocfs2_extent_tree_type {
30 OCFS2_DINODE_EXTENT = 0,
33 struct ocfs2_alloc_context;
34 int ocfs2_insert_extent(struct ocfs2_super *osb,
37 struct buffer_head *root_bh,
42 struct ocfs2_alloc_context *meta_ac,
43 enum ocfs2_extent_tree_type et_type);
44 enum ocfs2_alloc_restarted {
49 int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
54 struct buffer_head *root_bh,
55 struct ocfs2_extent_list *root_el,
57 struct ocfs2_alloc_context *data_ac,
58 struct ocfs2_alloc_context *meta_ac,
59 enum ocfs2_alloc_restarted *reason_ret,
60 enum ocfs2_extent_tree_type type);
61 struct ocfs2_cached_dealloc_ctxt;
62 int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,
63 handle_t *handle, u32 cpos, u32 len, u32 phys,
64 struct ocfs2_alloc_context *meta_ac,
65 struct ocfs2_cached_dealloc_ctxt *dealloc,
66 enum ocfs2_extent_tree_type et_type);
67 int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh,
68 u32 cpos, u32 len, handle_t *handle,
69 struct ocfs2_alloc_context *meta_ac,
70 struct ocfs2_cached_dealloc_ctxt *dealloc,
71 enum ocfs2_extent_tree_type et_type);
72 int ocfs2_num_free_extents(struct ocfs2_super *osb,
74 struct buffer_head *root_bh,
75 enum ocfs2_extent_tree_type et_type);
78 * how many new metadata chunks would an allocation need at maximum?
80 * Please note that the caller must make sure that root_el is the root
81 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
82 * the result may be wrong.
84 static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el)
87 * Rather than do all the work of determining how much we need
88 * (involves a ton of reads and locks), just ask for the
89 * maximal limit. That's a tree depth shift. So, one block for
90 * level of the tree (current l_tree_depth), one block for the
91 * new tree_depth==0 extent_block, and one block at the new
94 return le16_to_cpu(root_el->l_tree_depth) + 2;
97 void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di);
98 void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di);
99 int ocfs2_convert_inline_data_to_extents(struct inode *inode,
100 struct buffer_head *di_bh);
102 int ocfs2_truncate_log_init(struct ocfs2_super *osb);
103 void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb);
104 void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
106 int ocfs2_flush_truncate_log(struct ocfs2_super *osb);
107 int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
109 struct ocfs2_dinode **tl_copy);
110 int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
111 struct ocfs2_dinode *tl_copy);
112 int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb);
113 int ocfs2_truncate_log_append(struct ocfs2_super *osb,
116 unsigned int num_clusters);
117 int __ocfs2_flush_truncate_log(struct ocfs2_super *osb);
120 * Process local structure which describes the block unlinks done
121 * during an operation. This is populated via
122 * ocfs2_cache_block_dealloc().
124 * ocfs2_run_deallocs() should be called after the potentially
125 * de-allocating routines. No journal handles should be open, and most
126 * locks should have been dropped.
128 struct ocfs2_cached_dealloc_ctxt {
129 struct ocfs2_per_slot_free_list *c_first_suballocator;
131 static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c)
133 c->c_first_suballocator = NULL;
135 int ocfs2_run_deallocs(struct ocfs2_super *osb,
136 struct ocfs2_cached_dealloc_ctxt *ctxt);
138 struct ocfs2_truncate_context {
139 struct ocfs2_cached_dealloc_ctxt tc_dealloc;
140 int tc_ext_alloc_locked; /* is it cluster locked? */
141 /* these get destroyed once it's passed to ocfs2_commit_truncate. */
142 struct buffer_head *tc_last_eb_bh;
145 int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
146 u64 range_start, u64 range_end);
147 int ocfs2_prepare_truncate(struct ocfs2_super *osb,
149 struct buffer_head *fe_bh,
150 struct ocfs2_truncate_context **tc);
151 int ocfs2_commit_truncate(struct ocfs2_super *osb,
153 struct buffer_head *fe_bh,
154 struct ocfs2_truncate_context *tc);
155 int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
156 unsigned int start, unsigned int end, int trunc);
158 int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
159 u32 cpos, struct buffer_head **leaf_bh);
160 int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster);
163 * Helper function to look at the # of clusters in an extent record.
165 static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el,
166 struct ocfs2_extent_rec *rec)
169 * Cluster count in extent records is slightly different
170 * between interior nodes and leaf nodes. This is to support
171 * unwritten extents which need a flags field in leaf node
172 * records, thus shrinking the available space for a clusters
175 if (el->l_tree_depth)
176 return le32_to_cpu(rec->e_int_clusters);
178 return le16_to_cpu(rec->e_leaf_clusters);
182 * This is only valid for leaf nodes, which are the only ones that can
183 * have empty extents anyway.
185 static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec)
187 return !rec->e_leaf_clusters;
190 #endif /* OCFS2_ALLOC_H */