fs/nilfs2/segbuf.h

1 /* SPDX-License-Identifier: GPL-2.0+ */
3  * segbuf.h - NILFS Segment buffer prototypes and definitions
5  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
19  * struct nilfs_segsum_info - On-memory segment summary
23  * @nsumblk: Number of summary blocks
24  * @sumbytes: Byte count of segment summary
33 	unsigned long		nfinfo;
34 	unsigned long		nblocks;
35 	unsigned long		nsumblk;
36 	unsigned long		sumbytes;
37 	unsigned long		nfileblk;
45  * struct nilfs_segment_buffer - Segment buffer
48  * @sb_sum: On-memory segment summary
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))
98 	(list_entry((head)->next, struct buffer_head, b_assoc_buffers))
100 	(list_entry((bh)->b_assoc_buffers.next, struct buffer_head, \
102 #define NILFS_SEGBUF_BH_IS_LAST(bh, head)  ((bh)->b_assoc_buffers.next == head)
108 void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
123 	unsigned int flags = segbuf->sb_sum.flags;  in nilfs_segbuf_simplex()
131 	return segbuf->sb_sum.nblocks == segbuf->sb_sum.nsumblk;  in nilfs_segbuf_empty()
138 	list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_segsum_buffers);  in nilfs_segbuf_add_segsum_buffer()
139 	segbuf->sb_sum.nblocks++;  in nilfs_segbuf_add_segsum_buffer()
140 	segbuf->sb_sum.nsumblk++;  in nilfs_segbuf_add_segsum_buffer()
147 	list_add_tail(&bh->b_assoc_buffers, &segbuf->sb_payload_buffers);  in nilfs_segbuf_add_payload_buffer()
148 	segbuf->sb_sum.nblocks++;  in nilfs_segbuf_add_payload_buffer()
157 	segbuf->sb_sum.nfileblk++;  in nilfs_segbuf_add_file_buffer()