nilfs2: simplify handling of active state of segments

will reduce some lines of segment constructor.  Previously, the state was
complexly controlled through a list of segments in order to keep
consistency in meta data of usage state of segments.  Instead, this
presents ``calculated'' active flags to userland cleaner program and stop
maintaining its real flag on disk.

Only by this fake flag, the cleaner cannot exactly know if each segment is
reclaimable or not.  However, the recent extension of nilfs_sustat ioctl
struct (nilfs2-extend-nilfs_sustat-ioctl-struct.patch) can prevent the
cleaner from reclaiming in-use segment wrongly.

So, now I can apply this for simplification.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 4 deletions

diff --git a/fs/nilfs2/segbuf.h b/fs/nilfs2/segbuf.h
index 25f2a5faa483..0c3076f4e592 100644
--- a/fs/nilfs2/segbuf.h
+++ b/fs/nilfs2/segbuf.h
@@ -68,7 +68,6 @@ struct nilfs_segsum_info {
  * struct nilfs_segment_buffer - Segment buffer
  * @sb_super: back pointer to a superblock struct
  * @sb_list: List head to chain this structure
- * @sb_segent: Pointer for attaching a segment entry
  * @sb_sum: On-memory segment summary
  * @sb_segnum: Index number of the full segment
  * @sb_nextnum: Index number of the next full segment
@@ -83,7 +82,6 @@ struct nilfs_segsum_info {
 struct nilfs_segment_buffer {
         struct super_block     *sb_super;
         struct list_head        sb_list;
-        struct nilfs_segment_entry *sb_segent;
 
         /* Segment information */
         struct nilfs_segsum_info sb_sum;
@@ -125,8 +123,8 @@ int __init nilfs_init_segbuf_cache(void);
 void nilfs_destroy_segbuf_cache(void);
 struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *);
 void nilfs_segbuf_free(struct nilfs_segment_buffer *);
-int nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
-                     struct the_nilfs *);
+void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
+                      struct the_nilfs *);
 void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
                                   struct the_nilfs *);
 int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t);