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>
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 4cf47e0..c774cf3 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -158,7 +158,6 @@
if (!nilfs_segment_usage_clean(su))
continue;
/* found a clean segment */
- nilfs_segment_usage_set_active(su);
nilfs_segment_usage_set_dirty(su);
kunmap_atomic(kaddr, KM_USER0);
@@ -591,6 +590,7 @@
struct buffer_head *su_bh;
struct nilfs_segment_usage *su;
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
+ struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
void *kaddr;
unsigned long nsegs, segusages_per_block;
ssize_t n;
@@ -623,7 +623,11 @@
for (j = 0; j < n; j++, su = (void *)su + susz) {
si[i + j].sui_lastmod = le64_to_cpu(su->su_lastmod);
si[i + j].sui_nblocks = le32_to_cpu(su->su_nblocks);
- si[i + j].sui_flags = le32_to_cpu(su->su_flags);
+ si[i + j].sui_flags = le32_to_cpu(su->su_flags) &
+ ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
+ if (nilfs_segment_is_active(nilfs, segnum + i + j))
+ si[i + j].sui_flags |=
+ (1UL << NILFS_SEGMENT_USAGE_ACTIVE);
}
kunmap_atomic(kaddr, KM_USER0);
brelse(su_bh);