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nilfs2: add routines to save and restore bmap state

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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>
This commit is contained in:
Ryusuke Konishi 2010-08-30 23:42:18 +09:00
parent adbb39b548
commit a8070dd365
2 changed files with 26 additions and 0 deletions
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18
fs/nilfs2/bmap.c
View File

@ -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); lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode; 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;
}

8
fs/nilfs2/bmap.h
View File

@ -135,6 +135,12 @@ struct nilfs_bmap {
/* state */ /* state */
#define NILFS_BMAP_DIRTY 0x00000001 #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_test_and_clear_dirty(struct nilfs_bmap *);
int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *); 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_init_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
void nilfs_bmap_commit_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, static inline int nilfs_bmap_lookup(struct nilfs_bmap *bmap, __u64 key,
__u64 *ptr) __u64 *ptr)