int
sfs_unlink(struct inode *dp, char *name){
struct inode *ip;
struct sfs_dirent de;
uint off;
vop_ilock(dp);
// Cannot unlink "." or "..".
if(namecmp(name, ".") == 0 || namecmp(name, "..") == 0)
goto bad;
if((ip = vop_dirlookup(dp, name, &off)) == 0)
goto bad;
vop_ilock(ip);
if(vop_getnlink(ip) < 1)
panic("unlink: nlink < 1");
if(vop_gettype(ip) == T_DIR && !vop_isdirempty(ip)){
vop_iunlockput(ip);
goto bad;
}
memset(&de, 0, sizeof(de));
if(vop_write(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
panic("unlink: writei");
if(vop_gettype(ip) == T_DIR){
vop_link_dec(dp);
vop_iupdate(dp);
}
vop_iunlockput(dp);
vop_link_dec(ip);
vop_iupdate(ip);
vop_iunlockput(ip);
return 0;
bad:
vop_iunlockput(dp);
return -1;
}
int file_write(int fd, void *base, size_t len, size_t * copied_store)
{
int ret;
struct file *file;
*copied_store = 0;
if ((ret = fd2file(fd, &file)) != 0) {
return ret;
}
if (!file->writable) {
return -E_INVAL;
}
filemap_acquire(file);
struct iobuf __iob, *iob = iobuf_init(&__iob, base, len, file->pos);
ret = vop_write(file->node, iob, file->io_flags);
size_t copied = iobuf_used(iob);
file->pos += copied;
*copied_store = copied;
filemap_release(file);
return ret;
}
// write file
int
file_write(int fd, void *base, size_t len, size_t *copied_store) {
int ret;
struct file *file;
*copied_store = 0;
if ((ret = fd2file(fd, &file)) != 0) {
return ret;
}
if (!file->writable) {
return -E_INVAL;
}
fd_array_acquire(file);
struct iobuf __iob, *iob = iobuf_init(&__iob, base, len, file->pos);
ret = vop_write(file->node, iob);
size_t copied = iobuf_used(iob);
if (file->status == FD_OPENED) {
file->pos += copied;
}
*copied_store = copied;
fd_array_release(file);
return ret;
}
