/**
* initialize the dot(.) and dotdot(..) dir entries for new directory
* @param inode inode for itself
* @return return 0 on success, EIO on failure
*
* inode must have start cluster of itself and start cluster of parent dir
*/
int init_new_dir(struct inode *inode)
{
struct buffer_head *bh = NULL;
struct rfs_dir_entry *dot_ep = NULL;
struct rfs_dir_entry *dotdot_ep = NULL;
unsigned char dummy = 0;
int err = 0;
/* initialize .(itself) and ..(parent) */
dot_ep = get_entry(inode, 0, &bh);
if (IS_ERR(dot_ep)) {
brelse(bh);
return -EIO;
}
dotdot_ep = (struct rfs_dir_entry *) (bh->b_data + DENTRY_SIZE);
init_dir_entry(inode, dot_ep, TYPE_DIR,
RFS_I(inode)->start_clu, DOT, &dummy);
init_dir_entry(inode, dotdot_ep, TYPE_DIR,
RFS_I(inode)->p_start_clu, DOTDOT, &dummy);
rfs_mark_buffer_dirty(bh, inode->i_sb);
brelse(bh);
return err;
}
/**
* block commit write
* @param inode inode
* @param page page pointer
* @param from start offset within page
* @param to last offset within page
* @return return 0 on success, errno on failure
*/
int rfs_block_commit_write(struct inode *inode, struct page *page,
unsigned from, unsigned to)
{
unsigned block_start, block_end;
unsigned blocksize;
struct buffer_head *bh, *head;
blocksize = 1 << inode->i_blkbits;
for(bh = head = page->buffers, block_start = 0;
bh != head || !block_start;
block_start=block_end + 1, bh = bh->b_this_page) {
block_end = block_start + blocksize - 1;
if (block_end < from)
continue;
else if (block_start > to)
break;
else {
set_bit(BH_Uptodate, &bh->b_state);
__mark_buffer_dirty(bh);
down(&RFS_I(inode)->data_mutex);
buffer_insert_inode_data_queue(bh, inode);
up(&RFS_I(inode)->data_mutex);
}
}
return 0;
}
