Esempi in C++ (Cpp) per afs_calc_vnode_cb_break

Esempio n. 1

File: super.c Progetto: Anjali05/linux

/*
 * return information about an AFS volume
 */
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
	struct afs_fs_cursor fc;
	struct afs_volume_status vs;
	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
	struct key *key;
	int ret;

	buf->f_type	= dentry->d_sb->s_magic;
	buf->f_bsize	= AFS_BLOCK_SIZE;
	buf->f_namelen	= AFSNAMEMAX - 1;

	if (as->dyn_root) {
		buf->f_blocks	= 1;
		buf->f_bavail	= 0;
		buf->f_bfree	= 0;
		return 0;
	}

	key = afs_request_key(vnode->volume->cell);
	if (IS_ERR(key))
		return PTR_ERR(key);

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, vnode, key)) {
		fc.flags |= AFS_FS_CURSOR_NO_VSLEEP;
		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(vnode);
			afs_fs_get_volume_status(&fc, &vs);
		}

		afs_check_for_remote_deletion(&fc, fc.vnode);
		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
		ret = afs_end_vnode_operation(&fc);
	}

	key_put(key);

	if (ret == 0) {
		if (vs.max_quota == 0)
			buf->f_blocks = vs.part_max_blocks;
		else
			buf->f_blocks = vs.max_quota;
		buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
	}

	return ret;
}

Esempio n. 2

File: write.c Progetto: krzk/linux

/*
 * write to a file
 */
static int afs_store_data(struct address_space *mapping,
			  pgoff_t first, pgoff_t last,
			  unsigned offset, unsigned to)
{
	struct afs_vnode *vnode = AFS_FS_I(mapping->host);
	struct afs_fs_cursor fc;
	struct afs_wb_key *wbk = NULL;
	struct list_head *p;
	int ret = -ENOKEY, ret2;

	_enter("%s{%x:%u.%u},%lx,%lx,%x,%x",
	       vnode->volume->name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       first, last, offset, to);

	spin_lock(&vnode->wb_lock);
	p = vnode->wb_keys.next;

	/* Iterate through the list looking for a valid key to use. */
try_next_key:
	while (p != &vnode->wb_keys) {
		wbk = list_entry(p, struct afs_wb_key, vnode_link);
		_debug("wbk %u", key_serial(wbk->key));
		ret2 = key_validate(wbk->key);
		if (ret2 == 0)
			goto found_key;
		if (ret == -ENOKEY)
			ret = ret2;
		p = p->next;
	}

	spin_unlock(&vnode->wb_lock);
	afs_put_wb_key(wbk);
	_leave(" = %d [no keys]", ret);
	return ret;

found_key:
	refcount_inc(&wbk->usage);
	spin_unlock(&vnode->wb_lock);

	_debug("USE WB KEY %u", key_serial(wbk->key));

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, vnode, wbk->key)) {
		while (afs_select_fileserver(&fc)) {
			fc.cb_break = afs_calc_vnode_cb_break(vnode);
			afs_fs_store_data(&fc, mapping, first, last, offset, to);
		}

		afs_check_for_remote_deletion(&fc, fc.vnode);
		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
		ret = afs_end_vnode_operation(&fc);
	}

	switch (ret) {
	case 0:
		afs_stat_v(vnode, n_stores);
		atomic_long_add((last * PAGE_SIZE + to) -
				(first * PAGE_SIZE + offset),
				&afs_v2net(vnode)->n_store_bytes);
		break;
	case -EACCES:
	case -EPERM:
	case -ENOKEY:
	case -EKEYEXPIRED:
	case -EKEYREJECTED:
	case -EKEYREVOKED:
		_debug("next");
		spin_lock(&vnode->wb_lock);
		p = wbk->vnode_link.next;
		afs_put_wb_key(wbk);
		goto try_next_key;
	}

	afs_put_wb_key(wbk);
	_leave(" = %d", ret);
	return ret;
}