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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> | |
64b5a32e RK |
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 | |
50614bcf | 40 | * @cno: Checkpoint number |
64b5a32e RK |
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; | |
50614bcf | 52 | __u64 cno; |
64b5a32e RK |
53 | time_t ctime; |
54 | sector_t next; | |
55 | }; | |
56 | ||
57 | /* macro for the flags */ | |
58 | #define NILFS_SEG_HAS_SR(sum) ((sum)->flags & NILFS_SS_SR) | |
59 | #define NILFS_SEG_LOGBGN(sum) ((sum)->flags & NILFS_SS_LOGBGN) | |
60 | #define NILFS_SEG_LOGEND(sum) ((sum)->flags & NILFS_SS_LOGEND) | |
61 | #define NILFS_SEG_DSYNC(sum) ((sum)->flags & NILFS_SS_SYNDT) | |
62 | #define NILFS_SEG_SIMPLEX(sum) \ | |
63 | (((sum)->flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) == \ | |
64 | (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) | |
65 | ||
66 | #define NILFS_SEG_EMPTY(sum) ((sum)->nblocks == (sum)->nsumblk) | |
67 | ||
68 | /** | |
69 | * struct nilfs_segment_buffer - Segment buffer | |
70 | * @sb_super: back pointer to a superblock struct | |
71 | * @sb_list: List head to chain this structure | |
64b5a32e RK |
72 | * @sb_sum: On-memory segment summary |
73 | * @sb_segnum: Index number of the full segment | |
74 | * @sb_nextnum: Index number of the next full segment | |
75 | * @sb_fseg_start: Start block number of the full segment | |
76 | * @sb_fseg_end: End block number of the full segment | |
77 | * @sb_pseg_start: Disk block number of partial segment | |
78 | * @sb_rest_blocks: Number of residual blocks in the current segment | |
79 | * @sb_segsum_buffers: List of buffers for segment summaries | |
80 | * @sb_payload_buffers: List of buffers for segment payload | |
1e2b68bf | 81 | * @sb_super_root: Pointer to buffer storing a super root block (if exists) |
9284ad2a RK |
82 | * @sb_nbio: Number of flying bio requests |
83 | * @sb_err: I/O error status | |
84 | * @sb_bio_event: Completion event of log writing | |
64b5a32e RK |
85 | */ |
86 | struct nilfs_segment_buffer { | |
87 | struct super_block *sb_super; | |
88 | struct list_head sb_list; | |
64b5a32e RK |
89 | |
90 | /* Segment information */ | |
91 | struct nilfs_segsum_info sb_sum; | |
92 | __u64 sb_segnum; | |
93 | __u64 sb_nextnum; | |
94 | sector_t sb_fseg_start, sb_fseg_end; | |
95 | sector_t sb_pseg_start; | |
96 | unsigned sb_rest_blocks; | |
97 | ||
98 | /* Buffers */ | |
99 | struct list_head sb_segsum_buffers; | |
100 | struct list_head sb_payload_buffers; /* including super root */ | |
1e2b68bf | 101 | struct buffer_head *sb_super_root; |
64b5a32e RK |
102 | |
103 | /* io status */ | |
9284ad2a RK |
104 | int sb_nbio; |
105 | atomic_t sb_err; | |
106 | struct completion sb_bio_event; | |
64b5a32e RK |
107 | }; |
108 | ||
109 | #define NILFS_LIST_SEGBUF(head) \ | |
110 | list_entry((head), struct nilfs_segment_buffer, sb_list) | |
111 | #define NILFS_NEXT_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.next) | |
112 | #define NILFS_PREV_SEGBUF(segbuf) NILFS_LIST_SEGBUF((segbuf)->sb_list.prev) | |
113 | #define NILFS_LAST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->prev) | |
114 | #define NILFS_FIRST_SEGBUF(head) NILFS_LIST_SEGBUF((head)->next) | |
115 | #define NILFS_SEGBUF_IS_LAST(segbuf, head) ((segbuf)->sb_list.next == (head)) | |
116 | ||
117 | #define nilfs_for_each_segbuf_before(s, t, h) \ | |
118 | for ((s) = NILFS_FIRST_SEGBUF(h); (s) != (t); \ | |
119 | (s) = NILFS_NEXT_SEGBUF(s)) | |
120 | ||
121 | #define NILFS_SEGBUF_FIRST_BH(head) \ | |
122 | (list_entry((head)->next, struct buffer_head, b_assoc_buffers)) | |
123 | #define NILFS_SEGBUF_NEXT_BH(bh) \ | |
124 | (list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \ | |
125 | b_assoc_buffers)) | |
126 | #define NILFS_SEGBUF_BH_IS_LAST(bh, head) ((bh)->b_assoc_buffers.next == head) | |
127 | ||
41c88bd7 | 128 | extern struct kmem_cache *nilfs_segbuf_cachep; |
64b5a32e | 129 | |
64b5a32e RK |
130 | struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *); |
131 | void nilfs_segbuf_free(struct nilfs_segment_buffer *); | |
cece5520 RK |
132 | void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long, |
133 | struct the_nilfs *); | |
a694291a RK |
134 | void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf, |
135 | struct nilfs_segment_buffer *prev); | |
64b5a32e RK |
136 | void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64, |
137 | struct the_nilfs *); | |
50614bcf | 138 | int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t, __u64); |
64b5a32e RK |
139 | int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *); |
140 | int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *, | |
141 | struct buffer_head **); | |
142 | void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *); | |
64b5a32e RK |
143 | |
144 | static inline void | |
145 | nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf, | |
146 | struct buffer_head *bh) | |
147 | { | |
148 | list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers); | |
149 | segbuf->sb_sum.nblocks++; | |
150 | segbuf->sb_sum.nsumblk++; | |
151 | } | |
152 | ||
153 | static inline void | |
154 | nilfs_segbuf_add_payload_buffer(struct nilfs_segment_buffer *segbuf, | |
155 | struct buffer_head *bh) | |
156 | { | |
157 | list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers); | |
158 | segbuf->sb_sum.nblocks++; | |
159 | } | |
160 | ||
161 | static inline void | |
162 | nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf, | |
163 | struct buffer_head *bh) | |
164 | { | |
165 | get_bh(bh); | |
166 | nilfs_segbuf_add_payload_buffer(segbuf, bh); | |
167 | segbuf->sb_sum.nfileblk++; | |
168 | } | |
169 | ||
e29df395 RK |
170 | void nilfs_clear_logs(struct list_head *logs); |
171 | void nilfs_truncate_logs(struct list_head *logs, | |
172 | struct nilfs_segment_buffer *last); | |
d1c6b72a | 173 | int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs); |
e29df395 | 174 | int nilfs_wait_on_logs(struct list_head *logs); |
aaed1d5b | 175 | void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed); |
e29df395 RK |
176 | |
177 | static inline void nilfs_destroy_logs(struct list_head *logs) | |
178 | { | |
179 | nilfs_truncate_logs(logs, NULL); | |
180 | } | |
181 | ||
64b5a32e | 182 | #endif /* _NILFS_SEGBUF_H */ |