diff options
Diffstat (limited to 'fs/nilfs2/dat.c')
| -rw-r--r-- | fs/nilfs2/dat.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/fs/nilfs2/dat.c b/fs/nilfs2/dat.c index 1ff8e15bd36b..187dd07ba86c 100644 --- a/fs/nilfs2/dat.c +++ b/fs/nilfs2/dat.c @@ -33,6 +33,16 @@ #define NILFS_CNO_MIN ((__u64)1) #define NILFS_CNO_MAX (~(__u64)0) +struct nilfs_dat_info { + struct nilfs_mdt_info mi; + struct nilfs_palloc_cache palloc_cache; +}; + +static inline struct nilfs_dat_info *NILFS_DAT_I(struct inode *dat) +{ + return (struct nilfs_dat_info *)NILFS_MDT(dat); +} + static int nilfs_dat_prepare_entry(struct inode *dat, struct nilfs_palloc_req *req, int create) { @@ -425,3 +435,40 @@ ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned visz, return nvi; } + +/** + * nilfs_dat_read - read dat inode + * @dat: dat inode + * @raw_inode: on-disk dat inode + */ +int nilfs_dat_read(struct inode *dat, struct nilfs_inode *raw_inode) +{ + return nilfs_read_inode_common(dat, raw_inode); +} + +/** + * nilfs_dat_new - create dat file + * @nilfs: nilfs object + * @entry_size: size of a dat entry + */ +struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size) +{ + static struct lock_class_key dat_lock_key; + struct inode *dat; + struct nilfs_dat_info *di; + int err; + + dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO, sizeof(*di)); + if (dat) { + err = nilfs_palloc_init_blockgroup(dat, entry_size); + if (unlikely(err)) { + nilfs_mdt_destroy(dat); + return NULL; + } + + di = NILFS_DAT_I(dat); + lockdep_set_class(&di->mi.mi_sem, &dat_lock_key); + nilfs_palloc_setup_cache(dat, &di->palloc_cache); + } + return dat; +} |