fs/hpfs/namei.c

Source file repositories/reference/linux-study-clean/fs/hpfs/namei.c

File Facts

System
Linux kernel
Corpus path
fs/hpfs/namei.c
Extension
.c
Size
15972 bytes
Lines
622
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) {
			if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, new_name, new_len, NULL, &qbh1))) {
				clear_nlink(new_inode);
				copy_de(nde, &de);
				memcpy(nde->name, new_name, new_len);
				hpfs_mark_4buffers_dirty(&qbh1);
				hpfs_brelse4(&qbh1);
				goto end;
			}
			hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent");
			err = -EFSERROR;
			goto end1;
		}
		err = -ENOSPC;
		goto end1;
	}

	if (new_dir == old_dir) hpfs_brelse4(&qbh);

	if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de))) {
		if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!");
		err = r == 1 ? -ENOSPC : -EFSERROR;
		if (new_dir != old_dir) hpfs_brelse4(&qbh);
		goto end1;
	}
	
	if (new_dir == old_dir)
		if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
			hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2");
			err = -ENOENT;
			goto end1;
		}

	if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) {
		hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent");
		err = r == 2 ? -ENOSPC : -EFSERROR;
		goto end1;
	}

end:
	hpfs_i(i)->i_parent_dir = new_dir->i_ino;
	if (S_ISDIR(i->i_mode)) {
		inc_nlink(new_dir);
		drop_nlink(old_dir);
	}
	if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) {
		fnode->up = cpu_to_le32(new_dir->i_ino);
		fnode->len = new_len;
		memcpy(fnode->name, new_name, new_len>15?15:new_len);
		if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len);
		mark_buffer_dirty(bh);
		brelse(bh);
	}
end1:
	if (!err) {
		hpfs_update_directory_times(old_dir);
		hpfs_update_directory_times(new_dir);
	}
	hpfs_unlock(i->i_sb);
	return err;
}

const struct inode_operations hpfs_dir_iops =
{
	.create		= hpfs_create,
	.lookup		= hpfs_lookup,
	.unlink		= hpfs_unlink,
	.symlink	= hpfs_symlink,
	.mkdir		= hpfs_mkdir,
	.rmdir		= hpfs_rmdir,
	.mknod		= hpfs_mknod,
	.rename		= hpfs_rename,
	.setattr	= hpfs_setattr,
};

Annotation

Implementation Notes