chdir_mkdir.c

//
// Created by bruce on 27/04/20.
//

#include <fs/fs.h>

int sys_chdir(struct proc* who, const char* pathname){
    int ret = 0;
    inode_t *inode = NULL, *curr_working;

    if((ret = get_inode_by_path(who, pathname, &inode)))
        return ret;

    if(!inode)
        return -EEXIST;

    if(!(S_ISDIR(inode->i_mode))){
        ret = -ENOTDIR;
        goto error;
    }

    curr_working = who->fp_workdir;
    who->fp_workdir = inode;
    put_inode(curr_working, false);
    return 0;
    error:
    put_inode(inode, false);
    return ret;
}

int sys_mkdir(struct proc* who, const char* pathname, mode_t mode){
    char string[WINIX_NAME_LEN];
    struct inode *lastdir = NULL, *ino = NULL;
    int ret = 0, bnr;
    bool is_dirty = false;

    ret = eat_path(who, pathname, &lastdir, &ino, string);
    if(ret)
        return ret;
    if(ino){
        ret = -EEXIST;
        goto final;
    }
    ino = alloc_inode(lastdir->i_dev, lastdir->i_dev);
    if(!ino){
        ret = -ENOSPC;
        goto final;
    }
    init_inode_proc_field(ino, who, S_IFDIR, mode);
    bnr = alloc_block(ino, lastdir->i_dev);
    if ( bnr <= 0){
        ret = bnr;
        goto final;
    }
    ino->i_zone[0] = bnr;
    ino->i_size = BLOCK_SIZE;
    ret = init_dirent(lastdir, ino);
    if(ret){
        goto final;
    }
    ret = add_inode_to_directory(who, lastdir, ino, string);
    if(ret){
        release_inode(ino);
        goto final_dir;
    }
    is_dirty = true;

    final:
    put_inode(ino, is_dirty);
    final_dir:
    put_inode(lastdir, is_dirty);
    return ret;
}

int do_chdir(struct proc* who, struct message* msg){
    char* path = (char *) get_physical_addr(msg->m1_p1, who);
    if(!is_vaddr_accessible(msg->m1_p1, who))
        return -EFAULT;
    return sys_chdir(who, path);
}

int do_mkdir(struct proc* who, struct message* msg){
    char* path = (char *) get_physical_addr(msg->m1_p1, who);
    if(!is_vaddr_accessible(msg->m1_p1, who))
        return -EFAULT;
    return sys_mkdir(who, path, msg->m1_i1);
}