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TOMOYO Linux Cross Reference
Linux/fs/nilfs2/segbuf.h

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  1 /* SPDX-License-Identifier: GPL-2.0+ */
  2 /*
  3  * segbuf.h - NILFS Segment buffer prototypes and definitions
  4  *
  5  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
  6  *
  7  * Written by Ryusuke Konishi.
  8  *
  9  */
 10 #ifndef _NILFS_SEGBUF_H
 11 #define _NILFS_SEGBUF_H
 12 
 13 #include <linux/fs.h>
 14 #include <linux/buffer_head.h>
 15 #include <linux/bio.h>
 16 #include <linux/completion.h>
 17 
 18 /**
 19  * struct nilfs_segsum_info - On-memory segment summary
 20  * @flags: Flags
 21  * @nfinfo: Number of file information structures
 22  * @nblocks: Number of blocks included in the partial segment
 23  * @nsumblk: Number of summary blocks
 24  * @sumbytes: Byte count of segment summary
 25  * @nfileblk: Total number of file blocks
 26  * @seg_seq: Segment sequence number
 27  * @cno: Checkpoint number
 28  * @ctime: Creation time
 29  * @next: Block number of the next full segment
 30  */
 31 struct nilfs_segsum_info {
 32         unsigned int            flags;
 33         unsigned long           nfinfo;
 34         unsigned long           nblocks;
 35         unsigned long           nsumblk;
 36         unsigned long           sumbytes;
 37         unsigned long           nfileblk;
 38         u64                     seg_seq;
 39         __u64                   cno;
 40         time64_t                ctime;
 41         sector_t                next;
 42 };
 43 
 44 /**
 45  * struct nilfs_segment_buffer - Segment buffer
 46  * @sb_super: back pointer to a superblock struct
 47  * @sb_list: List head to chain this structure
 48  * @sb_sum: On-memory segment summary
 49  * @sb_segnum: Index number of the full segment
 50  * @sb_nextnum: Index number of the next full segment
 51  * @sb_fseg_start: Start block number of the full segment
 52  * @sb_fseg_end: End block number of the full segment
 53  * @sb_pseg_start: Disk block number of partial segment
 54  * @sb_rest_blocks: Number of residual blocks in the current segment
 55  * @sb_segsum_buffers: List of buffers for segment summaries
 56  * @sb_payload_buffers: List of buffers for segment payload
 57  * @sb_super_root: Pointer to buffer storing a super root block (if exists)
 58  * @sb_nbio: Number of flying bio requests
 59  * @sb_err: I/O error status
 60  * @sb_bio_event: Completion event of log writing
 61  */
 62 struct nilfs_segment_buffer {
 63         struct super_block     *sb_super;
 64         struct list_head        sb_list;
 65 
 66         /* Segment information */
 67         struct nilfs_segsum_info sb_sum;
 68         __u64                   sb_segnum;
 69         __u64                   sb_nextnum;
 70         sector_t                sb_fseg_start, sb_fseg_end;
 71         sector_t                sb_pseg_start;
 72         unsigned int            sb_rest_blocks;
 73 
 74         /* Buffers */
 75         struct list_head        sb_segsum_buffers;
 76         struct list_head        sb_payload_buffers; /* including super root */
 77         struct buffer_head     *sb_super_root;
 78 
 79         /* io status */
 80         int                     sb_nbio;
 81         atomic_t                sb_err;
 82         struct completion       sb_bio_event;
 83 };
 84 
 85 #define NILFS_LIST_SEGBUF(head)  \
 86         list_entry((head), struct nilfs_segment_buffer, sb_list)
 87 #define NILFS_NEXT_SEGBUF(segbuf)  NILFS_LIST_SEGBUF((segbuf)->sb_list.next)
 88 #define NILFS_PREV_SEGBUF(segbuf)  NILFS_LIST_SEGBUF((segbuf)->sb_list.prev)
 89 #define NILFS_LAST_SEGBUF(head)    NILFS_LIST_SEGBUF((head)->prev)
 90 #define NILFS_FIRST_SEGBUF(head)   NILFS_LIST_SEGBUF((head)->next)
 91 #define NILFS_SEGBUF_IS_LAST(segbuf, head)  ((segbuf)->sb_list.next == (head))
 92 
 93 #define nilfs_for_each_segbuf_before(s, t, h) \
 94         for ((s) = NILFS_FIRST_SEGBUF(h); (s) != (t); \
 95              (s) = NILFS_NEXT_SEGBUF(s))
 96 
 97 #define NILFS_SEGBUF_FIRST_BH(head)  \
 98         (list_entry((head)->next, struct buffer_head, b_assoc_buffers))
 99 #define NILFS_SEGBUF_NEXT_BH(bh)  \
100         (list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \
101                     b_assoc_buffers))
102 #define NILFS_SEGBUF_BH_IS_LAST(bh, head)  ((bh)->b_assoc_buffers.next == head)
103 
104 extern struct kmem_cache *nilfs_segbuf_cachep;
105 
106 struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *);
107 void nilfs_segbuf_free(struct nilfs_segment_buffer *);
108 void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
109                       struct the_nilfs *);
110 void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
111                            struct nilfs_segment_buffer *prev);
112 void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
113                                   struct the_nilfs *);
114 int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned int, time64_t,
115                        __u64);
116 int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *);
117 int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *,
118                                 struct buffer_head **);
119 void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *);
120 
121 static inline int nilfs_segbuf_simplex(struct nilfs_segment_buffer *segbuf)
122 {
123         unsigned int flags = segbuf->sb_sum.flags;
124 
125         return (flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) ==
126                 (NILFS_SS_LOGBGN | NILFS_SS_LOGEND);
127 }
128 
129 static inline int nilfs_segbuf_empty(struct nilfs_segment_buffer *segbuf)
130 {
131         return segbuf->sb_sum.nblocks == segbuf->sb_sum.nsumblk;
132 }
133 
134 static inline void
135 nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf,
136                                struct buffer_head *bh)
137 {
138         list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers);
139         segbuf->sb_sum.nblocks++;
140         segbuf->sb_sum.nsumblk++;
141 }
142 
143 static inline void
144 nilfs_segbuf_add_payload_buffer(struct nilfs_segment_buffer *segbuf,
145                                 struct buffer_head *bh)
146 {
147         list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers);
148         segbuf->sb_sum.nblocks++;
149 }
150 
151 static inline void
152 nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf,
153                              struct buffer_head *bh)
154 {
155         get_bh(bh);
156         nilfs_segbuf_add_payload_buffer(segbuf, bh);
157         segbuf->sb_sum.nfileblk++;
158 }
159 
160 void nilfs_clear_logs(struct list_head *logs);
161 void nilfs_truncate_logs(struct list_head *logs,
162                          struct nilfs_segment_buffer *last);
163 int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs);
164 int nilfs_wait_on_logs(struct list_head *logs);
165 void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed);
166 
167 static inline void nilfs_destroy_logs(struct list_head *logs)
168 {
169         nilfs_truncate_logs(logs, NULL);
170 }
171 
172 #endif /* _NILFS_SEGBUF_H */
173 

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