nilfs2: extend nilfs_sustat ioctl struct
This adds a new argument to the nilfs_sustat structure.
The extended field allows to delete volatile active state of segments,
which was needed to protect freshly-created segments from garbage
collection but has confused code dealing with segments. This
extension alleviates the mess and gives room for further
simplifications.
The volatile active flag is not persistent, so it's eliminable on this
occasion without affecting compatibility other than the ioctl change.
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/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 75da373..af566e7 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -51,7 +51,6 @@
* @ns_writer_refcount: number of referrers on ns_writer
* @ns_sbh: buffer head of the on-disk super block
* @ns_sbp: pointer to the super block data
- * @ns_used_segments: list of full segments in volatile active state
* @ns_supers: list of nilfs super block structs
* @ns_seg_seq: segment sequence counter
* @ns_segnum: index number of the latest full segment.
@@ -65,6 +64,7 @@
* @ns_last_pseg: start block number of the latest segment
* @ns_last_seq: sequence value of the latest segment
* @ns_last_cno: checkpoint number of the latest segment
+ * @ns_prot_seq: least sequence number of segments which must not be reclaimed
* @ns_free_segments_count: counter of free segments
* @ns_segctor_sem: segment constructor semaphore
* @ns_dat: DAT file inode
@@ -103,7 +103,6 @@
*/
struct buffer_head *ns_sbh;
struct nilfs_super_block *ns_sbp;
- struct list_head ns_used_segments;
unsigned ns_mount_state;
struct list_head ns_supers;
@@ -132,6 +131,7 @@
sector_t ns_last_pseg;
u64 ns_last_seq;
__u64 ns_last_cno;
+ u64 ns_prot_seq;
unsigned long ns_free_segments_count;
struct rw_semaphore ns_segctor_sem;
@@ -188,7 +188,6 @@
int init_nilfs(struct the_nilfs *, struct nilfs_sb_info *, char *);
int load_nilfs(struct the_nilfs *, struct nilfs_sb_info *);
int nilfs_count_free_blocks(struct the_nilfs *, sector_t *);
-void nilfs_dispose_used_segments(struct the_nilfs *);
int nilfs_checkpoint_is_mounted(struct the_nilfs *, __u64, int);
int nilfs_near_disk_full(struct the_nilfs *);