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ccd979bd MF |
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 | ||
e7d4cb6b TM |
29 | enum ocfs2_extent_tree_type { |
30 | OCFS2_DINODE_EXTENT = 0, | |
f56654c4 | 31 | OCFS2_XATTR_VALUE_EXTENT, |
ba492615 | 32 | OCFS2_XATTR_TREE_EXTENT, |
e7d4cb6b TM |
33 | }; |
34 | ||
ccd979bd | 35 | struct ocfs2_alloc_context; |
f56654c4 TM |
36 | int ocfs2_dinode_insert_extent(struct ocfs2_super *osb, |
37 | handle_t *handle, | |
38 | struct inode *inode, | |
39 | struct buffer_head *root_bh, | |
40 | u32 cpos, | |
41 | u64 start_blk, | |
42 | u32 new_clusters, | |
43 | u8 flags, | |
44 | struct ocfs2_alloc_context *meta_ac); | |
45 | int ocfs2_xattr_value_insert_extent(struct ocfs2_super *osb, | |
46 | handle_t *handle, | |
47 | struct inode *inode, | |
48 | struct buffer_head *root_bh, | |
49 | u32 cpos, | |
50 | u64 start_blk, | |
51 | u32 new_clusters, | |
52 | u8 flags, | |
53 | struct ocfs2_alloc_context *meta_ac, | |
54 | void *private); | |
ba492615 TM |
55 | int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb, |
56 | handle_t *handle, | |
57 | struct inode *inode, | |
58 | struct buffer_head *root_bh, | |
59 | u32 cpos, | |
60 | u64 start_blk, | |
61 | u32 new_clusters, | |
62 | u8 flags, | |
63 | struct ocfs2_alloc_context *meta_ac); | |
0eb8d47e TM |
64 | enum ocfs2_alloc_restarted { |
65 | RESTART_NONE = 0, | |
66 | RESTART_TRANS, | |
67 | RESTART_META | |
68 | }; | |
69 | int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb, | |
70 | struct inode *inode, | |
71 | u32 *logical_offset, | |
72 | u32 clusters_to_add, | |
73 | int mark_unwritten, | |
74 | struct buffer_head *root_bh, | |
75 | struct ocfs2_extent_list *root_el, | |
76 | handle_t *handle, | |
77 | struct ocfs2_alloc_context *data_ac, | |
78 | struct ocfs2_alloc_context *meta_ac, | |
79 | enum ocfs2_alloc_restarted *reason_ret, | |
f56654c4 TM |
80 | enum ocfs2_extent_tree_type type, |
81 | void *private); | |
328d5752 | 82 | struct ocfs2_cached_dealloc_ctxt; |
e7d4cb6b | 83 | int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh, |
328d5752 MF |
84 | handle_t *handle, u32 cpos, u32 len, u32 phys, |
85 | struct ocfs2_alloc_context *meta_ac, | |
e7d4cb6b | 86 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
f56654c4 TM |
87 | enum ocfs2_extent_tree_type et_type, |
88 | void *private); | |
e7d4cb6b | 89 | int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh, |
063c4561 MF |
90 | u32 cpos, u32 len, handle_t *handle, |
91 | struct ocfs2_alloc_context *meta_ac, | |
e7d4cb6b | 92 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
f56654c4 TM |
93 | enum ocfs2_extent_tree_type et_type, |
94 | void *private); | |
ccd979bd MF |
95 | int ocfs2_num_free_extents(struct ocfs2_super *osb, |
96 | struct inode *inode, | |
e7d4cb6b | 97 | struct buffer_head *root_bh, |
f56654c4 TM |
98 | enum ocfs2_extent_tree_type et_type, |
99 | void *private); | |
e7d4cb6b | 100 | |
811f933d TM |
101 | /* |
102 | * how many new metadata chunks would an allocation need at maximum? | |
103 | * | |
104 | * Please note that the caller must make sure that root_el is the root | |
105 | * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise | |
106 | * the result may be wrong. | |
107 | */ | |
108 | static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el) | |
ccd979bd MF |
109 | { |
110 | /* | |
111 | * Rather than do all the work of determining how much we need | |
112 | * (involves a ton of reads and locks), just ask for the | |
113 | * maximal limit. That's a tree depth shift. So, one block for | |
114 | * level of the tree (current l_tree_depth), one block for the | |
115 | * new tree_depth==0 extent_block, and one block at the new | |
116 | * top-of-the tree. | |
117 | */ | |
811f933d | 118 | return le16_to_cpu(root_el->l_tree_depth) + 2; |
ccd979bd MF |
119 | } |
120 | ||
5b6a3a2b | 121 | void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di); |
1afc32b9 MF |
122 | void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di); |
123 | int ocfs2_convert_inline_data_to_extents(struct inode *inode, | |
124 | struct buffer_head *di_bh); | |
125 | ||
ccd979bd MF |
126 | int ocfs2_truncate_log_init(struct ocfs2_super *osb); |
127 | void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb); | |
128 | void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb, | |
129 | int cancel); | |
130 | int ocfs2_flush_truncate_log(struct ocfs2_super *osb); | |
131 | int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb, | |
132 | int slot_num, | |
133 | struct ocfs2_dinode **tl_copy); | |
134 | int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb, | |
135 | struct ocfs2_dinode *tl_copy); | |
063c4561 MF |
136 | int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb); |
137 | int ocfs2_truncate_log_append(struct ocfs2_super *osb, | |
138 | handle_t *handle, | |
139 | u64 start_blk, | |
140 | unsigned int num_clusters); | |
141 | int __ocfs2_flush_truncate_log(struct ocfs2_super *osb); | |
ccd979bd | 142 | |
2b604351 MF |
143 | /* |
144 | * Process local structure which describes the block unlinks done | |
145 | * during an operation. This is populated via | |
146 | * ocfs2_cache_block_dealloc(). | |
147 | * | |
148 | * ocfs2_run_deallocs() should be called after the potentially | |
149 | * de-allocating routines. No journal handles should be open, and most | |
150 | * locks should have been dropped. | |
151 | */ | |
152 | struct ocfs2_cached_dealloc_ctxt { | |
153 | struct ocfs2_per_slot_free_list *c_first_suballocator; | |
154 | }; | |
155 | static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c) | |
156 | { | |
157 | c->c_first_suballocator = NULL; | |
158 | } | |
159 | int ocfs2_run_deallocs(struct ocfs2_super *osb, | |
160 | struct ocfs2_cached_dealloc_ctxt *ctxt); | |
161 | ||
ccd979bd | 162 | struct ocfs2_truncate_context { |
59a5e416 | 163 | struct ocfs2_cached_dealloc_ctxt tc_dealloc; |
ccd979bd MF |
164 | int tc_ext_alloc_locked; /* is it cluster locked? */ |
165 | /* these get destroyed once it's passed to ocfs2_commit_truncate. */ | |
166 | struct buffer_head *tc_last_eb_bh; | |
167 | }; | |
168 | ||
35edec1d MF |
169 | int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle, |
170 | u64 range_start, u64 range_end); | |
ccd979bd MF |
171 | int ocfs2_prepare_truncate(struct ocfs2_super *osb, |
172 | struct inode *inode, | |
173 | struct buffer_head *fe_bh, | |
174 | struct ocfs2_truncate_context **tc); | |
175 | int ocfs2_commit_truncate(struct ocfs2_super *osb, | |
176 | struct inode *inode, | |
177 | struct buffer_head *fe_bh, | |
178 | struct ocfs2_truncate_context *tc); | |
1afc32b9 MF |
179 | int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh, |
180 | unsigned int start, unsigned int end, int trunc); | |
ccd979bd | 181 | |
363041a5 MF |
182 | int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el, |
183 | u32 cpos, struct buffer_head **leaf_bh); | |
328d5752 | 184 | int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster); |
363041a5 | 185 | |
e48edee2 MF |
186 | /* |
187 | * Helper function to look at the # of clusters in an extent record. | |
188 | */ | |
189 | static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el, | |
190 | struct ocfs2_extent_rec *rec) | |
191 | { | |
192 | /* | |
193 | * Cluster count in extent records is slightly different | |
194 | * between interior nodes and leaf nodes. This is to support | |
195 | * unwritten extents which need a flags field in leaf node | |
196 | * records, thus shrinking the available space for a clusters | |
197 | * field. | |
198 | */ | |
199 | if (el->l_tree_depth) | |
200 | return le32_to_cpu(rec->e_int_clusters); | |
201 | else | |
202 | return le16_to_cpu(rec->e_leaf_clusters); | |
203 | } | |
204 | ||
00dc417f MF |
205 | /* |
206 | * This is only valid for leaf nodes, which are the only ones that can | |
207 | * have empty extents anyway. | |
208 | */ | |
209 | static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec) | |
210 | { | |
211 | return !rec->e_leaf_clusters; | |
212 | } | |
213 | ||
ccd979bd | 214 | #endif /* OCFS2_ALLOC_H */ |