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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 | #include <linux/backing-dev.h> |
31 | |
32 | /** |
33 | * struct nilfs_segsum_info - On-memory segment summary |
34 | * @flags: Flags |
35 | * @nfinfo: Number of file information structures |
36 | * @nblocks: Number of blocks included in the partial segment |
37 | * @nsumblk: Number of summary blocks |
38 | * @sumbytes: Byte count of segment summary |
39 | * @nfileblk: Total number of file blocks |
40 | * @seg_seq: Segment sequence 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 | time_t ctime; |
53 | sector_t next; |
54 | }; |
55 | |
56 | /* macro for the flags */ |
57 | #define NILFS_SEG_HAS_SR(sum) ((sum)->flags & NILFS_SS_SR) |
58 | #define NILFS_SEG_LOGBGN(sum) ((sum)->flags & NILFS_SS_LOGBGN) |
59 | #define NILFS_SEG_LOGEND(sum) ((sum)->flags & NILFS_SS_LOGEND) |
60 | #define NILFS_SEG_DSYNC(sum) ((sum)->flags & NILFS_SS_SYNDT) |
61 | #define NILFS_SEG_SIMPLEX(sum) \ |
62 | (((sum)->flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) == \ |
63 | (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) |
64 | |
65 | #define NILFS_SEG_EMPTY(sum) ((sum)->nblocks == (sum)->nsumblk) |
66 | |
67 | /** |
68 | * struct nilfs_segment_buffer - Segment buffer |
69 | * @sb_super: back pointer to a superblock struct |
70 | * @sb_list: List head to chain this structure |
71 | * @sb_sum: On-memory segment summary |
72 | * @sb_segnum: Index number of the full segment |
73 | * @sb_nextnum: Index number of the next full segment |
74 | * @sb_fseg_start: Start block number of the full segment |
75 | * @sb_fseg_end: End block number of the full segment |
76 | * @sb_pseg_start: Disk block number of partial segment |
77 | * @sb_rest_blocks: Number of residual blocks in the current segment |
78 | * @sb_segsum_buffers: List of buffers for segment summaries |
79 | * @sb_payload_buffers: List of buffers for segment payload |
80 | * @sb_io_error: I/O error status |
81 | */ |
82 | struct nilfs_segment_buffer { |
83 | struct super_block *sb_super; |
84 | struct list_head sb_list; |
85 | |
86 | /* Segment information */ |
87 | struct nilfs_segsum_info sb_sum; |
88 | __u64 sb_segnum; |
89 | __u64 sb_nextnum; |
90 | sector_t sb_fseg_start, sb_fseg_end; |
91 | sector_t sb_pseg_start; |
92 | unsigned sb_rest_blocks; |
93 | |
94 | /* Buffers */ |
95 | struct list_head sb_segsum_buffers; |
96 | struct list_head sb_payload_buffers; /* including super root */ |
97 | |
98 | /* io status */ |
99 | int sb_io_error; |
100 | }; |
101 | |
102 | #define NILFS_LIST_SEGBUF(head) \ |
103 | list_entry((head), struct nilfs_segment_buffer, sb_list) |
104 | #define NILFS_NEXT_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.next) |
105 | #define NILFS_PREV_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.prev) |
106 | #define NILFS_LAST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->prev) |
107 | #define NILFS_FIRST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->next) |
108 | #define NILFS_SEGBUF_IS_LAST(segbuf, head) ((segbuf)->sb_list.next == (head)) |
109 | |
110 | #define nilfs_for_each_segbuf_before(s, t, h) \ |
111 | for ((s) = NILFS_FIRST_SEGBUF(h); (s) != (t); \ |
112 | (s) = NILFS_NEXT_SEGBUF(s)) |
113 | |
114 | #define NILFS_SEGBUF_FIRST_BH(head) \ |
115 | (list_entry((head)->next, struct buffer_head, b_assoc_buffers)) |
116 | #define NILFS_SEGBUF_NEXT_BH(bh) \ |
117 | (list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \ |
118 | b_assoc_buffers)) |
119 | #define NILFS_SEGBUF_BH_IS_LAST(bh, head) ((bh)->b_assoc_buffers.next == head) |
120 | |
121 | |
122 | int __init nilfs_init_segbuf_cache(void); |
123 | void nilfs_destroy_segbuf_cache(void); |
124 | struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *); |
125 | void nilfs_segbuf_free(struct nilfs_segment_buffer *); |
126 | void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long, |
127 | struct the_nilfs *); |
128 | void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64, |
129 | struct the_nilfs *); |
130 | int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t); |
131 | int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *); |
132 | int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *, |
133 | struct buffer_head **); |
134 | void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *); |
135 | void nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *, u32); |
136 | void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *, u32); |
137 | |
138 | static inline void |
139 | nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf, |
140 | struct buffer_head *bh) |
141 | { |
142 | list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers); |
143 | segbuf->sb_sum.nblocks++; |
144 | segbuf->sb_sum.nsumblk++; |
145 | } |
146 | |
147 | static inline void |
148 | nilfs_segbuf_add_payload_buffer(struct nilfs_segment_buffer *segbuf, |
149 | struct buffer_head *bh) |
150 | { |
151 | list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers); |
152 | segbuf->sb_sum.nblocks++; |
153 | } |
154 | |
155 | static inline void |
156 | nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf, |
157 | struct buffer_head *bh) |
158 | { |
159 | get_bh(bh); |
160 | nilfs_segbuf_add_payload_buffer(segbuf, bh); |
161 | segbuf->sb_sum.nfileblk++; |
162 | } |
163 | |
164 | void nilfs_release_buffers(struct list_head *); |
165 | |
166 | static inline void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf) |
167 | { |
168 | nilfs_release_buffers(&segbuf->sb_segsum_buffers); |
169 | nilfs_release_buffers(&segbuf->sb_payload_buffers); |
170 | } |
171 | |
172 | struct nilfs_write_info { |
173 | struct bio *bio; |
174 | int start, end; /* The region to be submitted */ |
175 | int rest_blocks; |
176 | int max_pages; |
177 | int nr_vecs; |
178 | sector_t blocknr; |
179 | |
180 | int nbio; |
181 | atomic_t err; |
182 | struct completion bio_event; |
183 | /* completion event of segment write */ |
184 | |
185 | /* |
186 | * The following fields must be set explicitly |
187 | */ |
188 | struct super_block *sb; |
189 | struct backing_dev_info *bdi; /* backing dev info */ |
190 | struct buffer_head *bh_sr; |
191 | }; |
192 | |
193 | |
194 | void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *, |
195 | struct nilfs_write_info *); |
196 | int nilfs_segbuf_write(struct nilfs_segment_buffer *, |
197 | struct nilfs_write_info *); |
198 | int nilfs_segbuf_wait(struct nilfs_segment_buffer *, |
199 | struct nilfs_write_info *); |
200 | |
201 | #endif /* _NILFS_SEGBUF_H */ |
202 |
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