Return to dmapi_lib.c CVS log

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dm_handle_to_path() will now work in most cases, and in the other cases
there's just a little more grunt work that has to be done in the library.  If
the directory that contains some component of the path has never had a lookup
performed on it, then the kernel won't have that dir in its dcache.  In that
case it'll create an anonymous dentry for the filesystem's root dir, and the
library detects that this happened.

If the library detects that an anonymous dentry was created, then it returns
an error indicating that it didn't find the path.  Before I take this another
step, I'd like to know if this scenario happens in actual practice.  I'm
betting the directory of interest has almost always been loaded into the
dcache by a user process before the HSM uses dm_handle_to_path().  We'll see.

It seems that ioctl(XFS_IOC_OPEN_BY_HANDLE) would have the same restriction,
though it looks like it's never used in a case where the path hasn't already
been accessed.

This mod also removes libdm's dependence on libhandle.
Add DM_OPEN_BY_HANDLE case.

/*
 * Copyright (c) 1995-2001 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307,
 * USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#include <fcntl.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/errno.h>

#include <dmapi.h>
#include <dmapi_kern.h>
#include "dmapi_lib.h"

#define ARG(y)	(long)va_arg(ap,y)

static int dmapi_fd = -1;

int
dmi_init_service( char *versionstr )
{
	dmapi_fd = open( "/proc/fs/xfs_dmapi", O_RDWR );
	if( dmapi_fd == -1 )
		return -1;
	return 0;
}


int
dmi( int opcode, ... )
{
	va_list ap;
	sys_dmapi_args_t u;
	int ret = 0;

	if( dmapi_fd == -1 ){
		/* dm_init_service wasn't called, or failed.  The spec
		 * says my behavior is undefined.
		 */
		errno = ENOSYS;
		return -1;
	}

	va_start(ap, opcode);
	switch( opcode ){
/* dm_session */
	case DM_CREATE_SESSION:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(char*);
		u.arg3 = ARG(dm_sessid_t*);
		break;
	case DM_QUERY_SESSION:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(size_t);
		u.arg3 = ARG(void*);
		u.arg4 = ARG(size_t*);
		break;
	case DM_GETALL_SESSIONS:
		u.arg1 = ARG(u_int);
		u.arg2 = ARG(dm_sessid_t*);
		u.arg3 = ARG(u_int*);
		break;
	case DM_DESTROY_SESSION:
		u.arg1 = ARG(dm_sessid_t);
		break;
	case DM_GETALL_TOKENS:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(u_int);
		u.arg3 = ARG(dm_token_t*);
		u.arg4 = ARG(u_int*);
		break;
	case DM_FIND_EVENTMSG:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(dm_token_t);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(void*);
		u.arg5 = ARG(size_t*);
		break;
/* dm_config */
	case DM_GET_CONFIG:
		u.arg1 = ARG(void*);
		u.arg2 = ARG(size_t);
		u.arg3 = ARG(dm_config_t);
		u.arg4 = ARG(dm_size_t*);
		break;
	case DM_GET_CONFIG_EVENTS:
		u.arg1 = ARG(void*);
		u.arg2 = ARG(size_t);
		u.arg3 = ARG(u_int);
		u.arg4 = ARG(dm_eventset_t*);
		u.arg5 = ARG(u_int*);
		break;
/* dm_attr */
	case DM_GET_FILEATTR:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_stat_t*);
		break;
	case DM_SET_FILEATTR:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_fileattr_t*);
		break;
/* dm_bulkattr */
	case DM_INIT_ATTRLOC:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_attrloc_t*);
		break;
	case DM_GET_BULKATTR:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_attrloc_t*);
		u.arg7 = ARG(size_t);
		u.arg8 = ARG(void*);
		u.arg9 = ARG(size_t*);
		break;
	case DM_GET_DIRATTRS:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_attrloc_t*);
		u.arg7 = ARG(size_t);
		u.arg8 = ARG(void*);
		u.arg9 = ARG(size_t*);
		break;
	case DM_GET_BULKALL:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_attrname_t*);
		u.arg7 = ARG(dm_attrloc_t*);
		u.arg8 = ARG(size_t);
		u.arg9 = ARG(void*);
		u.arg10 = ARG(size_t*);
		break;
/* dm_dmattr */
	case DM_CLEAR_INHERIT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_attrname_t*);
		break;
	case DM_GET_DMATTR:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_attrname_t*);
		u.arg6 = ARG(size_t);
		u.arg7 = ARG(void*);
		u.arg8 = ARG(size_t*);
		break;
	case DM_GETALL_DMATTR:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(size_t);
		u.arg6 = ARG(void*);
		u.arg7 = ARG(size_t*);
		break;
	case DM_GETALL_INHERIT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_inherit_t*);
		u.arg7 = ARG(u_int*);
		break;
	case DM_REMOVE_DMATTR:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(int);
		u.arg6 = ARG(dm_attrname_t*);
		break;
	case DM_SET_DMATTR:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_attrname_t*);
		u.arg6 = ARG(int);
		u.arg7 = ARG(size_t);
		u.arg8 = ARG(void*);
		break;
	case DM_SET_INHERIT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_attrname_t*);
		u.arg6 = ARG(mode_t);
		break;
	case DM_SET_RETURN_ON_DESTROY:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_attrname_t*);
		u.arg6 = ARG(dm_boolean_t);
		break;
/* dm_event */
	case DM_GET_EVENTS:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(u_int);
		u.arg3 = ARG(u_int);
		u.arg4 = ARG(size_t);
		u.arg5 = ARG(void*);
		u.arg6 = ARG(size_t*);
		break;
	case DM_RESPOND_EVENT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(dm_token_t);
		u.arg3 = ARG(dm_response_t);
		u.arg4 = ARG(int);
		u.arg5 = ARG(size_t);
		u.arg6 = ARG(void*);
		break;
	case DM_GET_EVENTLIST:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_eventset_t*);
		u.arg7 = ARG(u_int*);
		break;
	case DM_SET_EVENTLIST:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_eventset_t*);
		u.arg6 = ARG(u_int);
		break;
	case DM_SET_DISP:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_eventset_t*);
		u.arg6 = ARG(u_int);
		break;
	case DM_CREATE_USEREVENT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(size_t);
		u.arg3 = ARG(void*);
		u.arg4 = ARG(dm_token_t*);
		break;
	case DM_SEND_MSG:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(dm_msgtype_t);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(void*);
		break;
	case DM_MOVE_EVENT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(dm_token_t);
		u.arg3 = ARG(dm_sessid_t);
		u.arg4 = ARG(dm_token_t*);
		break;
	case DM_PENDING:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(dm_token_t);
		u.arg3 = ARG(dm_timestruct_t*);
		break;
	case DM_GETALL_DISP:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(size_t);
		u.arg3 = ARG(void*);
		u.arg4 = ARG(size_t*);
		break;
/* dm_handle */
	case DM_PATH_TO_HANDLE:
		u.arg1 = ARG(char*);
		u.arg2 = ARG(char*);
		u.arg3 = ARG(size_t*);
		break;
	case DM_PATH_TO_FSHANDLE:
		u.arg1 = ARG(char*);
		u.arg2 = ARG(char*);
		u.arg3 = ARG(size_t*);
		break;
	case DM_FD_TO_HANDLE:
		u.arg1 = ARG(int);
		u.arg2 = ARG(char*);
		u.arg3 = ARG(size_t*);
		break;
	case DM_CREATE_BY_HANDLE:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(void*);
		u.arg6 = ARG(size_t);
		u.arg7 = ARG(char*);
		break;
	case DM_MKDIR_BY_HANDLE:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(void*);
		u.arg6 = ARG(size_t);
		u.arg7 = ARG(char*);
		break;
	case DM_SYMLINK_BY_HANDLE:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(void*);
		u.arg6 = ARG(size_t);
		u.arg7 = ARG(char*);
		u.arg8 = ARG(char*);
		break;
/* dm_handle2path */
	case DM_OPEN_BY_HANDLE:
		u.arg1 = ARG(void*);
		u.arg2 = ARG(size_t);
		u.arg3 = ARG(int);
		break;
/* dm_hole */
	case DM_GET_ALLOCINFO:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_off_t*);
		u.arg6 = ARG(u_int);
		u.arg7 = ARG(dm_extent_t*);
		u.arg8 = ARG(u_int*);
		break;
	case DM_PROBE_HOLE:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_off_t);
		u.arg6 = ARG(dm_size_t);
		u.arg7 = ARG(dm_off_t*);
		u.arg8 = ARG(dm_size_t*);
		break;
	case DM_PUNCH_HOLE:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_off_t);
		u.arg6 = ARG(dm_size_t);
		break;
/* dm_mountinfo */
	case DM_GET_MOUNTINFO:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(size_t);
		u.arg6 = ARG(void*);
		u.arg7 = ARG(size_t*);
		break;
/* dm_rdwr */
	case DM_READ_INVIS:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_off_t);
		u.arg6 = ARG(dm_size_t);
		u.arg7 = ARG(void*);
		break;
	case DM_WRITE_INVIS:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(int);
		u.arg6 = ARG(dm_off_t);
		u.arg7 = ARG(dm_size_t);
		u.arg8 = ARG(void*);
		break;
	case DM_SYNC_BY_HANDLE:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		break;
	case DM_GET_DIOINFO:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_dioinfo_t*);
		break;
/* dm_region */
	case DM_GET_REGION:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_region_t*);
		u.arg7 = ARG(u_int*);
		break;
	case DM_SET_REGION:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_region_t*);
		u.arg7 = ARG(dm_boolean_t*);
		break;
/* dm_right */
	case DM_DOWNGRADE_RIGHT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		break;
	case DM_OBJ_REF_HOLD:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(dm_token_t);
		u.arg3 = ARG(void*);
		u.arg4 = ARG(size_t);
		break;
	case DM_OBJ_REF_QUERY:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(dm_token_t);
		u.arg3 = ARG(void*);
		u.arg4 = ARG(size_t);
		break;
	case DM_OBJ_REF_RELE:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(dm_token_t);
		u.arg3 = ARG(void*);
		u.arg4 = ARG(size_t);
		break;
	case DM_QUERY_RIGHT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(dm_right_t*);
		break;
	case DM_RELEASE_RIGHT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		break;
	case DM_REQUEST_RIGHT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		u.arg5 = ARG(u_int);
		u.arg6 = ARG(dm_right_t);
		break;
	case DM_UPGRADE_RIGHT:
		u.arg1 = ARG(dm_sessid_t);
		u.arg2 = ARG(void*);
		u.arg3 = ARG(size_t);
		u.arg4 = ARG(dm_token_t);
		break;
	default:
		errno = ENOSYS;
		ret = -1;
		break;
	}
	va_end(ap);

	if( ret != -1 )
		ret = ioctl( dmapi_fd, opcode, &u );

	return(ret);
}