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// SPDX-License-Identifier: LGPL-2.1
/*
* Copyright (c) 1995, 2001-2002, 2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "platform_defs.h"
#include "xfs.h"
#include "handle.h"
#include "jdm.h"
#include "parent.h"
/* internal fshandle - typecast to a void for external use */
#define FSHANDLE_SZ 8
typedef struct fshandle {
char fsh_space[FSHANDLE_SZ];
} fshandle_t;
/* private file handle - for use by open_by_fshandle */
#define FILEHANDLE_SZ 24
#define FILEHANDLE_SZ_FOLLOWING 14
#define FILEHANDLE_SZ_PAD 2
typedef struct filehandle {
fshandle_t fh_fshandle; /* handle of fs containing this inode */
int16_t fh_sz_following; /* bytes in handle after this member */
char fh_pad[FILEHANDLE_SZ_PAD]; /* padding, must be zeroed */
uint32_t fh_gen; /* generation count */
xfs_ino_t fh_ino; /* 64 bit ino */
} filehandle_t;
static void
jdm_fill_filehandle( filehandle_t *handlep,
fshandle_t *fshandlep,
xfs_bstat_t *statp )
{
handlep->fh_fshandle = *fshandlep;
handlep->fh_sz_following = FILEHANDLE_SZ_FOLLOWING;
memset(handlep->fh_pad, 0, FILEHANDLE_SZ_PAD);
handlep->fh_gen = statp->bs_gen;
handlep->fh_ino = statp->bs_ino;
}
jdm_fshandle_t *
jdm_getfshandle( char *mntpnt )
{
fshandle_t *fshandlep;
size_t fshandlesz;
char resolved[MAXPATHLEN];
/* sanity checks */
ASSERT( sizeof( fshandle_t ) == FSHANDLE_SZ );
ASSERT( sizeof( filehandle_t ) == FILEHANDLE_SZ );
ASSERT( sizeof( filehandle_t )
-
offsetofmember( filehandle_t, fh_pad )
==
FILEHANDLE_SZ_FOLLOWING );
ASSERT( sizeofmember( filehandle_t, fh_pad ) == FILEHANDLE_SZ_PAD );
ASSERT( FILEHANDLE_SZ_PAD == sizeof( int16_t ));
fshandlep = NULL; /* for lint */
fshandlesz = sizeof( *fshandlep );
if (!realpath( mntpnt, resolved ))
return NULL;
if (path_to_fshandle( resolved, ( void ** )&fshandlep, &fshandlesz ))
return NULL;
assert( fshandlesz == sizeof( *fshandlep ));
return ( jdm_fshandle_t * )fshandlep;
}
/* externally visible functions */
void
jdm_new_filehandle( jdm_filehandle_t **handlep,
size_t *hlen,
jdm_fshandle_t *fshandlep,
xfs_bstat_t *statp)
{
/* allocate and fill filehandle */
*hlen = sizeof(filehandle_t);
*handlep = (filehandle_t *) malloc(*hlen);
if (*handlep)
jdm_fill_filehandle(*handlep, (fshandle_t *) fshandlep, statp);
}
/* ARGSUSED */
void
jdm_delete_filehandle( jdm_filehandle_t *handlep, size_t hlen )
{
free(handlep);
}
intgen_t
jdm_open( jdm_fshandle_t *fshp, xfs_bstat_t *statp, intgen_t oflags )
{
fshandle_t *fshandlep = ( fshandle_t * )fshp;
filehandle_t filehandle;
intgen_t fd;
jdm_fill_filehandle( &filehandle, fshandlep, statp );
fd = open_by_fshandle( ( void * )&filehandle,
sizeof( filehandle ),
oflags );
return fd;
}
intgen_t
jdm_readlink( jdm_fshandle_t *fshp,
xfs_bstat_t *statp,
char *bufp, size_t bufsz )
{
fshandle_t *fshandlep = ( fshandle_t * )fshp;
filehandle_t filehandle;
intgen_t rval;
jdm_fill_filehandle( &filehandle, fshandlep, statp );
rval = readlink_by_handle( ( void * )&filehandle,
sizeof( filehandle ),
( void * )bufp,
bufsz );
return rval;
}
int
jdm_attr_multi( jdm_fshandle_t *fshp,
xfs_bstat_t *statp,
char *bufp, int rtrvcnt, int flags)
{
fshandle_t *fshandlep = ( fshandle_t * )fshp;
filehandle_t filehandle;
int rval;
jdm_fill_filehandle( &filehandle, fshandlep, statp );
rval = attr_multi_by_handle ( ( void * )&filehandle,
sizeof( filehandle ),
(void *) bufp,
rtrvcnt, flags);
return rval;
}
int
jdm_attr_list( jdm_fshandle_t *fshp,
xfs_bstat_t *statp,
char *bufp, size_t bufsz, int flags,
struct attrlist_cursor *cursor)
{
fshandle_t *fshandlep = ( fshandle_t * )fshp;
filehandle_t filehandle;
int rval;
/* prevent needless EINVAL from the kernel */
if (bufsz > XFS_XATTR_LIST_MAX)
bufsz = XFS_XATTR_LIST_MAX;
jdm_fill_filehandle( &filehandle, fshandlep, statp );
rval = attr_list_by_handle (( void * )&filehandle,
sizeof( filehandle ),
bufp, bufsz, flags, cursor);
return rval;
}
int
jdm_parents( jdm_fshandle_t *fshp,
xfs_bstat_t *statp,
parent_t *bufp, size_t bufsz,
unsigned int *count)
{
errno = EOPNOTSUPP;
return -1;
}
int
jdm_parentpaths( jdm_fshandle_t *fshp,
xfs_bstat_t *statp,
parent_t *bufp, size_t bufsz,
unsigned int *count)
{
errno = EOPNOTSUPP;
return -1;
}
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