/**
* nilfs_bmap_read - read a bmap from an inode
* @bmap: bmap
* @raw_inode: on-disk inode
*
* Description: nilfs_bmap_read() initializes the bmap @bmap.
*
* Return Value: On success, 0 is returned. On error, the following negative
* error code is returned.
*
* %-ENOMEM - Insufficient amount of memory available.
*/
int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
{
if (raw_inode == NULL)
memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE);
else
memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE);
init_rwsem(&bmap->b_sem);
bmap->b_state = 0;
bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
switch (bmap->b_inode->i_ino) {
case NILFS_DAT_INO:
bmap->b_pops = &nilfs_bmap_ptr_ops_p;
bmap->b_last_allocated_key = 0; /* XXX: use macro */
bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
break;
case NILFS_CPFILE_INO:
case NILFS_SUFILE_INO:
bmap->b_pops = &nilfs_bmap_ptr_ops_vmdt;
bmap->b_last_allocated_key = 0; /* XXX: use macro */
bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
break;
default:
bmap->b_pops = &nilfs_bmap_ptr_ops_v;
bmap->b_last_allocated_key = 0; /* XXX: use macro */
bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
break;
}
return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?
nilfs_btree_init(bmap,
NILFS_BMAP_LARGE_LOW,
NILFS_BMAP_LARGE_HIGH) :
nilfs_direct_init(bmap,
NILFS_BMAP_SMALL_LOW,
NILFS_BMAP_SMALL_HIGH);
}
/**
* nilfs_bmap_read - read a bmap from an inode
* @bmap: bmap
* @raw_inode: on-disk inode
*
* Description: nilfs_bmap_read() initializes the bmap @bmap.
*
* Return Value: On success, 0 is returned. On error, the following negative
* error code is returned.
*
* %-ENOMEM - Insufficient amount of memory available.
*/
int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
{
if (raw_inode == NULL)
memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE);
else
memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE);
init_rwsem(&bmap->b_sem);
bmap->b_state = 0;
bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
switch (bmap->b_inode->i_ino) {
case NILFS_DAT_INO:
bmap->b_ptr_type = NILFS_BMAP_PTR_P;
bmap->b_last_allocated_key = 0;
bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
break;
case NILFS_CPFILE_INO:
case NILFS_SUFILE_INO:
bmap->b_ptr_type = NILFS_BMAP_PTR_VS;
bmap->b_last_allocated_key = 0;
bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
break;
case NILFS_IFILE_INO:
lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
/* Fall through */
default:
bmap->b_ptr_type = NILFS_BMAP_PTR_VM;
bmap->b_last_allocated_key = 0;
bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
break;
}
return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?
nilfs_btree_init(bmap) : nilfs_direct_init(bmap);
}
