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1 | /* |
2 | * segbuf.h - NILFS Segment buffer prototypes and definitions |
3 | * |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
19 | * |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> |
21 | * |
22 | */ |
23 | #ifndef _NILFS_SEGBUF_H |
24 | #define _NILFS_SEGBUF_H |
25 | |
26 | #include <linux/fs.h> |
27 | #include <linux/buffer_head.h> |
28 | #include <linux/bio.h> |
29 | #include <linux/completion.h> |
30 | |
31 | /** |
32 | * struct nilfs_segsum_info - On-memory segment summary |
33 | * @flags: Flags |
34 | * @nfinfo: Number of file information structures |
35 | * @nblocks: Number of blocks included in the partial segment |
36 | * @nsumblk: Number of summary blocks |
37 | * @sumbytes: Byte count of segment summary |
38 | * @nfileblk: Total number of file blocks |
39 | * @seg_seq: Segment sequence number |
40 | * @cno: Checkpoint number |
41 | * @ctime: Creation time |
42 | * @next: Block number of the next full segment |
43 | */ |
44 | struct nilfs_segsum_info { |
45 | unsigned int flags; |
46 | unsigned long nfinfo; |
47 | unsigned long nblocks; |
48 | unsigned long nsumblk; |
49 | unsigned long sumbytes; |
50 | unsigned long nfileblk; |
51 | u64 seg_seq; |
52 | __u64 cno; |
53 | time_t ctime; |
54 | sector_t next; |
55 | }; |
56 | |
57 | /** |
58 | * struct nilfs_segment_buffer - Segment buffer |
59 | * @sb_super: back pointer to a superblock struct |
60 | * @sb_list: List head to chain this structure |
61 | * @sb_sum: On-memory segment summary |
62 | * @sb_segnum: Index number of the full segment |
63 | * @sb_nextnum: Index number of the next full segment |
64 | * @sb_fseg_start: Start block number of the full segment |
65 | * @sb_fseg_end: End block number of the full segment |
66 | * @sb_pseg_start: Disk block number of partial segment |
67 | * @sb_rest_blocks: Number of residual blocks in the current segment |
68 | * @sb_segsum_buffers: List of buffers for segment summaries |
69 | * @sb_payload_buffers: List of buffers for segment payload |
70 | * @sb_super_root: Pointer to buffer storing a super root block (if exists) |
71 | * @sb_nbio: Number of flying bio requests |
72 | * @sb_err: I/O error status |
73 | * @sb_bio_event: Completion event of log writing |
74 | */ |
75 | struct nilfs_segment_buffer { |
76 | struct super_block *sb_super; |
77 | struct list_head sb_list; |
78 | |
79 | /* Segment information */ |
80 | struct nilfs_segsum_info sb_sum; |
81 | __u64 sb_segnum; |
82 | __u64 sb_nextnum; |
83 | sector_t sb_fseg_start, sb_fseg_end; |
84 | sector_t sb_pseg_start; |
85 | unsigned sb_rest_blocks; |
86 | |
87 | /* Buffers */ |
88 | struct list_head sb_segsum_buffers; |
89 | struct list_head sb_payload_buffers; /* including super root */ |
90 | struct buffer_head *sb_super_root; |
91 | |
92 | /* io status */ |
93 | int sb_nbio; |
94 | atomic_t sb_err; |
95 | struct completion sb_bio_event; |
96 | }; |
97 | |
98 | #define NILFS_LIST_SEGBUF(head) \ |
99 | list_entry((head), struct nilfs_segment_buffer, sb_list) |
100 | #define NILFS_NEXT_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.next) |
101 | #define NILFS_PREV_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.prev) |
102 | #define NILFS_LAST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->prev) |
103 | #define NILFS_FIRST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->next) |
104 | #define NILFS_SEGBUF_IS_LAST(segbuf, head) ((segbuf)->sb_list.next == (head)) |
105 | |
106 | #define nilfs_for_each_segbuf_before(s, t, h) \ |
107 | for ((s) = NILFS_FIRST_SEGBUF(h); (s) != (t); \ |
108 | (s) = NILFS_NEXT_SEGBUF(s)) |
109 | |
110 | #define NILFS_SEGBUF_FIRST_BH(head) \ |
111 | (list_entry((head)->next, struct buffer_head, b_assoc_buffers)) |
112 | #define NILFS_SEGBUF_NEXT_BH(bh) \ |
113 | (list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \ |
114 | b_assoc_buffers)) |
115 | #define NILFS_SEGBUF_BH_IS_LAST(bh, head) ((bh)->b_assoc_buffers.next == head) |
116 | |
117 | extern struct kmem_cache *nilfs_segbuf_cachep; |
118 | |
119 | struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *); |
120 | void nilfs_segbuf_free(struct nilfs_segment_buffer *); |
121 | void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long, |
122 | struct the_nilfs *); |
123 | void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf, |
124 | struct nilfs_segment_buffer *prev); |
125 | void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64, |
126 | struct the_nilfs *); |
127 | int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t, __u64); |
128 | int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *); |
129 | int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *, |
130 | struct buffer_head **); |
131 | void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *); |
132 | |
133 | static inline int nilfs_segbuf_simplex(struct nilfs_segment_buffer *segbuf) |
134 | { |
135 | unsigned int flags = segbuf->sb_sum.flags; |
136 | |
137 | return (flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) == |
138 | (NILFS_SS_LOGBGN | NILFS_SS_LOGEND); |
139 | } |
140 | |
141 | static inline int nilfs_segbuf_empty(struct nilfs_segment_buffer *segbuf) |
142 | { |
143 | return segbuf->sb_sum.nblocks == segbuf->sb_sum.nsumblk; |
144 | } |
145 | |
146 | static inline void |
147 | nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf, |
148 | struct buffer_head *bh) |
149 | { |
150 | list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers); |
151 | segbuf->sb_sum.nblocks++; |
152 | segbuf->sb_sum.nsumblk++; |
153 | } |
154 | |
155 | static inline void |
156 | nilfs_segbuf_add_payload_buffer(struct nilfs_segment_buffer *segbuf, |
157 | struct buffer_head *bh) |
158 | { |
159 | list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers); |
160 | segbuf->sb_sum.nblocks++; |
161 | } |
162 | |
163 | static inline void |
164 | nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf, |
165 | struct buffer_head *bh) |
166 | { |
167 | get_bh(bh); |
168 | nilfs_segbuf_add_payload_buffer(segbuf, bh); |
169 | segbuf->sb_sum.nfileblk++; |
170 | } |
171 | |
172 | void nilfs_clear_logs(struct list_head *logs); |
173 | void nilfs_truncate_logs(struct list_head *logs, |
174 | struct nilfs_segment_buffer *last); |
175 | int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs); |
176 | int nilfs_wait_on_logs(struct list_head *logs); |
177 | void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed); |
178 | |
179 | static inline void nilfs_destroy_logs(struct list_head *logs) |
180 | { |
181 | nilfs_truncate_logs(logs, NULL); |
182 | } |
183 | |
184 | #endif /* _NILFS_SEGBUF_H */ |
185 |
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