nilfs2: add routines to save and restore bmap state

This adds routines to save and restore the state of bmap structure.
The bmap state is stored in a given nilfs_bmap_store object.

These routines will be used to roll back the state of dat inode
without using gcdat inode.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

2 files changed, 26 insertions, 0 deletions

diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c
index 3dbdc1d356bf..00244402d59e 100644
--- a/fs/nilfs2/bmap.c
+++ b/fs/nilfs2/bmap.c
@@ -548,3 +548,21 @@ void nilfs_bmap_commit_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap)
         lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
         bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
 }
+
+void nilfs_bmap_save(const struct nilfs_bmap *bmap,
+                     struct nilfs_bmap_store *store)
+{
+        memcpy(store->data, bmap->b_u.u_data, sizeof(store->data));
+        store->last_allocated_key = bmap->b_last_allocated_key;
+        store->last_allocated_ptr = bmap->b_last_allocated_ptr;
+        store->state = bmap->b_state;
+}
+
+void nilfs_bmap_restore(struct nilfs_bmap *bmap,
+                        const struct nilfs_bmap_store *store)
+{
+        memcpy(bmap->b_u.u_data, store->data, sizeof(store->data));
+        bmap->b_last_allocated_key = store->last_allocated_key;
+        bmap->b_last_allocated_ptr = store->last_allocated_ptr;
+        bmap->b_state = store->state;
+}
diff --git a/fs/nilfs2/bmap.h b/fs/nilfs2/bmap.h
index a20569b19929..5f3339e3eac9 100644
--- a/fs/nilfs2/bmap.h
+++ b/fs/nilfs2/bmap.h
@@ -135,6 +135,12 @@ struct nilfs_bmap {
 /* state */
 #define NILFS_BMAP_DIRTY        0x00000001
 
+struct nilfs_bmap_store {
+        __le64 data[NILFS_BMAP_SIZE / sizeof(__le64)];
+        __u64 last_allocated_key;
+        __u64 last_allocated_ptr;
+        int state;
+};
 
 int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *);
 int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *);
@@ -156,6 +162,8 @@ void nilfs_bmap_init_gc(struct nilfs_bmap *);
 void nilfs_bmap_init_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
 void nilfs_bmap_commit_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
 
+void nilfs_bmap_save(const struct nilfs_bmap *, struct nilfs_bmap_store *);
+void nilfs_bmap_restore(struct nilfs_bmap *, const struct nilfs_bmap_store *);
 
 static inline int nilfs_bmap_lookup(struct nilfs_bmap *bmap, __u64 key,
                                     __u64 *ptr)