This patch introduces a new file system feature flag
NILFS_FEATURE_COMPAT_TRACK_LIVE_BLKS. If it is enabled, the file system
will keep track of the number of live blocks per segment. This
information can be used by the GC to select segments for cleaning more
efficiently.
Signed-off-by: Andreas Rohner <andreas.roh...@gmx.net>
---
fs/nilfs2/the_nilfs.h | 8 ++++++++
include/linux/nilfs2_fs.h | 4 +++-
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 12cd91d..d755b6b 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -401,4 +401,12 @@ static inline int nilfs_flush_device(struct the_nilfs
*nilfs)
return err;
}
+static inline int nilfs_feature_track_live_blks(struct the_nilfs *nilfs)
+{
+ const __u64 required_bits = NILFS_FEATURE_COMPAT_TRACK_LIVE_BLKS |
+ NILFS_FEATURE_COMPAT_SUFILE_LIVE_BLKS_EXT;
+
+ return ((nilfs->ns_feature_compat & required_bits) == required_bits);
+}
+
#endif /* _THE_NILFS_H */
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index 4800daa..5f05bbf 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -221,11 +221,13 @@ struct nilfs_super_block {
* doesn't know about, it should refuse to mount the filesystem.
*/
#define NILFS_FEATURE_COMPAT_SUFILE_LIVE_BLKS_EXT BIT(0)
+#define NILFS_FEATURE_COMPAT_TRACK_LIVE_BLKS BIT(1)
#define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT BIT(0)
#define NILFS_FEATURE_COMPAT_SUPP \
- (NILFS_FEATURE_COMPAT_SUFILE_LIVE_BLKS_EXT)
+ (NILFS_FEATURE_COMPAT_SUFILE_LIVE_BLKS_EXT | \
+ NILFS_FEATURE_COMPAT_TRACK_LIVE_BLKS)
#define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT
#define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
--
2.3.7
--
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