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-rw-r--r--fs/nilfs2/dat.c47
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;
+}