vnode.c

linux 内核源代码

	_enter("%s{%x:%u.%u},%x,%s",
	       vnode->volume->vlocation->vldb.name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key),
	       name);

	/* this op will fetch the status on the directory we're removing from */
	spin_lock(&vnode->lock);
	vnode->update_cnt++;
	spin_unlock(&vnode->lock);

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(vnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_remove(server, key, vnode, name, isdir,
				    &afs_sync_call);

	} while (!afs_volume_release_fileserver(vnode, server, ret));

	/* adjust the flags */
	if (ret == 0) {
		afs_vnode_finalise_status_update(vnode, server);
		afs_put_server(server);
	} else {
		afs_vnode_status_update_failed(vnode, ret);
	}

	_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
	return ret;

no_server:
	spin_lock(&vnode->lock);
	vnode->update_cnt--;
	ASSERTCMP(vnode->update_cnt, >=, 0);
	spin_unlock(&vnode->lock);
	_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
	return PTR_ERR(server);
}

/*
 * create a hard link
 */
int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode,
			  struct key *key, const char *name)
{
	struct afs_server *server;
	int ret;

	_enter("%s{%x:%u.%u},%s{%x:%u.%u},%x,%s",
	       dvnode->volume->vlocation->vldb.name,
	       dvnode->fid.vid,
	       dvnode->fid.vnode,
	       dvnode->fid.unique,
	       vnode->volume->vlocation->vldb.name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key),
	       name);

	/* this op will fetch the status on the directory we're removing from */
	spin_lock(&vnode->lock);
	vnode->update_cnt++;
	spin_unlock(&vnode->lock);
	spin_lock(&dvnode->lock);
	dvnode->update_cnt++;
	spin_unlock(&dvnode->lock);

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(dvnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_link(server, key, dvnode, vnode, name,
				  &afs_sync_call);

	} while (!afs_volume_release_fileserver(dvnode, server, ret));

	/* adjust the flags */
	if (ret == 0) {
		afs_vnode_finalise_status_update(vnode, server);
		afs_vnode_finalise_status_update(dvnode, server);
		afs_put_server(server);
	} else {
		afs_vnode_status_update_failed(vnode, ret);
		afs_vnode_status_update_failed(dvnode, ret);
	}

	_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
	return ret;

no_server:
	spin_lock(&vnode->lock);
	vnode->update_cnt--;
	ASSERTCMP(vnode->update_cnt, >=, 0);
	spin_unlock(&vnode->lock);
	spin_lock(&dvnode->lock);
	dvnode->update_cnt--;
	ASSERTCMP(dvnode->update_cnt, >=, 0);
	spin_unlock(&dvnode->lock);
	_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
	return PTR_ERR(server);
}

/*
 * create a symbolic link
 */
int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key,
		      const char *name, const char *content,
		      struct afs_fid *newfid,
		      struct afs_file_status *newstatus,
		      struct afs_server **_server)
{
	struct afs_server *server;
	int ret;

	_enter("%s{%x:%u.%u},%x,%s,%s,,,",
	       vnode->volume->vlocation->vldb.name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key),
	       name, content);

	/* this op will fetch the status on the directory we're creating in */
	spin_lock(&vnode->lock);
	vnode->update_cnt++;
	spin_unlock(&vnode->lock);

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(vnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_symlink(server, key, vnode, name, content,
				     newfid, newstatus, &afs_sync_call);

	} while (!afs_volume_release_fileserver(vnode, server, ret));

	/* adjust the flags */
	if (ret == 0) {
		afs_vnode_finalise_status_update(vnode, server);
		*_server = server;
	} else {
		afs_vnode_status_update_failed(vnode, ret);
		*_server = NULL;
	}

	_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
	return ret;

no_server:
	spin_lock(&vnode->lock);
	vnode->update_cnt--;
	ASSERTCMP(vnode->update_cnt, >=, 0);
	spin_unlock(&vnode->lock);
	_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
	return PTR_ERR(server);
}

/*
 * rename a file
 */
int afs_vnode_rename(struct afs_vnode *orig_dvnode,
		     struct afs_vnode *new_dvnode,
		     struct key *key,
		     const char *orig_name,
		     const char *new_name)
{
	struct afs_server *server;
	int ret;

	_enter("%s{%x:%u.%u},%s{%u,%u,%u},%x,%s,%s",
	       orig_dvnode->volume->vlocation->vldb.name,
	       orig_dvnode->fid.vid,
	       orig_dvnode->fid.vnode,
	       orig_dvnode->fid.unique,
	       new_dvnode->volume->vlocation->vldb.name,
	       new_dvnode->fid.vid,
	       new_dvnode->fid.vnode,
	       new_dvnode->fid.unique,
	       key_serial(key),
	       orig_name,
	       new_name);

	/* this op will fetch the status on both the directories we're dealing
	 * with */
	spin_lock(&orig_dvnode->lock);
	orig_dvnode->update_cnt++;
	spin_unlock(&orig_dvnode->lock);
	if (new_dvnode != orig_dvnode) {
		spin_lock(&new_dvnode->lock);
		new_dvnode->update_cnt++;
		spin_unlock(&new_dvnode->lock);
	}

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(orig_dvnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_rename(server, key, orig_dvnode, orig_name,
				    new_dvnode, new_name, &afs_sync_call);

	} while (!afs_volume_release_fileserver(orig_dvnode, server, ret));

	/* adjust the flags */
	if (ret == 0) {
		afs_vnode_finalise_status_update(orig_dvnode, server);
		if (new_dvnode != orig_dvnode)
			afs_vnode_finalise_status_update(new_dvnode, server);
		afs_put_server(server);
	} else {
		afs_vnode_status_update_failed(orig_dvnode, ret);
		if (new_dvnode != orig_dvnode)
			afs_vnode_status_update_failed(new_dvnode, ret);
	}

	_leave(" = %d [cnt %d]", ret, orig_dvnode->update_cnt);
	return ret;

no_server:
	spin_lock(&orig_dvnode->lock);
	orig_dvnode->update_cnt--;
	ASSERTCMP(orig_dvnode->update_cnt, >=, 0);
	spin_unlock(&orig_dvnode->lock);
	if (new_dvnode != orig_dvnode) {
		spin_lock(&new_dvnode->lock);
		new_dvnode->update_cnt--;
		ASSERTCMP(new_dvnode->update_cnt, >=, 0);
		spin_unlock(&new_dvnode->lock);
	}
	_leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt);
	return PTR_ERR(server);
}

/*
 * write to a file
 */
int afs_vnode_store_data(struct afs_writeback *wb, pgoff_t first, pgoff_t last,
			 unsigned offset, unsigned to)
{
	struct afs_server *server;
	struct afs_vnode *vnode = wb->vnode;
	int ret;

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

	/* this op will fetch the status */
	spin_lock(&vnode->lock);
	vnode->update_cnt++;
	spin_unlock(&vnode->lock);

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(vnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_store_data(server, wb, first, last, offset, to,
					&afs_sync_call);

	} while (!afs_volume_release_fileserver(vnode, server, ret));

	/* adjust the flags */
	if (ret == 0) {
		afs_vnode_finalise_status_update(vnode, server);
		afs_put_server(server);
	} else {
		afs_vnode_status_update_failed(vnode, ret);
	}

	_leave(" = %d", ret);
	return ret;

no_server:
	spin_lock(&vnode->lock);
	vnode->update_cnt--;
	ASSERTCMP(vnode->update_cnt, >=, 0);
	spin_unlock(&vnode->lock);
	return PTR_ERR(server);
}

/*
 * set the attributes on a file
 */
int afs_vnode_setattr(struct afs_vnode *vnode, struct key *key,
		      struct iattr *attr)
{
	struct afs_server *server;
	int ret;

	_enter("%s{%x:%u.%u},%x",
	       vnode->volume->vlocation->vldb.name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key));

	/* this op will fetch the status */
	spin_lock(&vnode->lock);
	vnode->update_cnt++;
	spin_unlock(&vnode->lock);

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(vnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_setattr(server, key, vnode, attr, &afs_sync_call);

	} while (!afs_volume_release_fileserver(vnode, server, ret));

	/* adjust the flags */
	if (ret == 0) {
		afs_vnode_finalise_status_update(vnode, server);
		afs_put_server(server);
	} else {
		afs_vnode_status_update_failed(vnode, ret);
	}

	_leave(" = %d", ret);
	return ret;

no_server:
	spin_lock(&vnode->lock);
	vnode->update_cnt--;
	ASSERTCMP(vnode->update_cnt, >=, 0);
	spin_unlock(&vnode->lock);
	return PTR_ERR(server);
}

/*
 * get the status of a volume
 */
int afs_vnode_get_volume_status(struct afs_vnode *vnode, struct key *key,
				struct afs_volume_status *vs)
{
	struct afs_server *server;
	int ret;

	_enter("%s{%x:%u.%u},%x,",
	       vnode->volume->vlocation->vldb.name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key));

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(vnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_get_volume_status(server, key, vnode, vs, &afs_sync_call);

	} while (!afs_volume_release_fileserver(vnode, server, ret));

	/* adjust the flags */
	if (ret == 0)
		afs_put_server(server);

	_leave(" = %d", ret);
	return ret;

no_server:
	return PTR_ERR(server);
}

/*
 * get a lock on a file
 */
int afs_vnode_set_lock(struct afs_vnode *vnode, struct key *key,
		       afs_lock_type_t type)
{
	struct afs_server *server;
	int ret;

	_enter("%s{%x:%u.%u},%x,%u",
	       vnode->volume->vlocation->vldb.name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key), type);

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(vnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_set_lock(server, key, vnode, type, &afs_sync_call);

	} while (!afs_volume_release_fileserver(vnode, server, ret));

	/* adjust the flags */
	if (ret == 0)
		afs_put_server(server);

	_leave(" = %d", ret);
	return ret;

no_server:
	return PTR_ERR(server);
}

/*
 * extend a lock on a file
 */
int afs_vnode_extend_lock(struct afs_vnode *vnode, struct key *key)
{
	struct afs_server *server;
	int ret;

	_enter("%s{%x:%u.%u},%x",
	       vnode->volume->vlocation->vldb.name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key));

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(vnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_extend_lock(server, key, vnode, &afs_sync_call);

	} while (!afs_volume_release_fileserver(vnode, server, ret));

	/* adjust the flags */
	if (ret == 0)
		afs_put_server(server);

	_leave(" = %d", ret);
	return ret;

no_server:
	return PTR_ERR(server);
}

/*
 * release a lock on a file
 */
int afs_vnode_release_lock(struct afs_vnode *vnode, struct key *key)
{
	struct afs_server *server;
	int ret;

	_enter("%s{%x:%u.%u},%x",
	       vnode->volume->vlocation->vldb.name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key));

	do {
		/* pick a server to query */
		server = afs_volume_pick_fileserver(vnode);
		if (IS_ERR(server))
			goto no_server;

		_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));

		ret = afs_fs_release_lock(server, key, vnode, &afs_sync_call);

	} while (!afs_volume_release_fileserver(vnode, server, ret));

	/* adjust the flags */
	if (ret == 0)
		afs_put_server(server);

	_leave(" = %d", ret);
	return ret;

no_server:
	return PTR_ERR(server);
}