minix/lib/libpuffs/subr.c

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/* $NetBSD: subr.c,v 1.23 2008/08/12 19:44:39 pooka Exp $ */
/*
* Copyright (c) 2006 Antti Kantee. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if !defined(lint)
__RCSID("$NetBSD: subr.c,v 1.23 2008/08/12 19:44:39 pooka Exp $");
#endif /* !lint */
#include <sys/types.h>
#include <sys/dirent.h>
#include <sys/time.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include "puffs.h"
#include "puffs_priv.h"
int
puffs_gendotdent(struct dirent **dent, ino_t id, int dotdot, size_t *reslen)
{
const char *name;
assert(dotdot == 0 || dotdot == 1);
name = dotdot == 0 ? "." : "..";
return puffs_nextdent(dent, name, id, DT_DIR, reslen);
}
int
puffs_nextdent(struct dirent **dent, const char *name, ino_t id, uint8_t dtype,
size_t *reslen)
{
struct dirent *d = *dent;
unsigned int len, reclen;
int o;
char *cp;
/* check if we have enough room for our dent-aligned dirent */
if (_DIRENT_RECLEN(d, strlen(name)) > *reslen)
return 0;
d->d_ino = id;
/* Compute the length of the name */
cp = memchr(name, '\0', NAME_MAX);
if (cp == NULL)
len = NAME_MAX;
else
len = cp - (name);
/* Compute record length */
reclen = offsetof(struct dirent, d_name) + len + 1;
o = (reclen % sizeof(long));
if (o != 0)
reclen += sizeof(long) - o;
/* FIXME: Set d_off?
* dep->d_off =
*/
d->d_reclen = (unsigned short) reclen;
(void)memcpy(d->d_name, name, (size_t)len);
d->d_name[len] = '\0';
*reslen -= d->d_reclen;
*dent = _DIRENT_NEXT(d);
return 1;
}
/*ARGSUSED*/
int
puffs_fsnop_unmount(struct puffs_usermount *dontuse1, int dontuse2)
{
/* would you like to see puffs rule again, my friend? */
return 0;
}
/*ARGSUSED*/
int
puffs_fsnop_sync(struct puffs_usermount *dontuse1, int dontuse2,
const struct puffs_cred *dontuse3)
{
return 0;
}
/*ARGSUSED*/
int
puffs_fsnop_statvfs(struct puffs_usermount *dontuse1, struct statvfs *sbp)
{
/* FIXME: implement me
sbp->f_bsize = sbp->f_frsize = sbp->f_iosize = 512;
sbp->f_bfree=sbp->f_bavail=sbp->f_bresvd=sbp->f_blocks = (fsblkcnt_t)0;
sbp->f_ffree=sbp->f_favail=sbp->f_fresvd=sbp->f_files = (fsfilcnt_t)0;
*/
return 0;
}
/*ARGSUSED3*/
int
puffs_genfs_node_getattr(struct puffs_usermount *pu, puffs_cookie_t opc,
struct vattr *va, const struct puffs_cred *pcr)
{
struct puffs_node *pn = PU_CMAP(pu, opc);
memcpy(va, &pn->pn_va, sizeof(struct vattr));
return 0;
}
/*
* Just put the node, don't do anything else. Don't use this if
* your fs needs more cleanup.
*/
/*ARGSUSED2*/
int
puffs_genfs_node_reclaim(struct puffs_usermount *pu, puffs_cookie_t opc)
{
puffs_pn_put(PU_CMAP(pu, opc));
return 0;
}
/*
* Just a wrapper to make calling the above nicer without having to pass
* NULLs from application code
*/
void
puffs_zerostatvfs(struct statvfs *sbp)
{
puffs_fsnop_statvfs(NULL, sbp);
}
/*
* Set vattr values for those applicable (i.e. not PUFFS_VNOVAL).
*/
void
puffs_setvattr(struct vattr *vap, const struct vattr *sva)
{
#define SETIFVAL(a, t) if (sva->a != (t)PUFFS_VNOVAL) vap->a = sva->a
if (sva->va_type != VNON)
vap->va_type = sva->va_type;
SETIFVAL(va_mode, mode_t);
SETIFVAL(va_nlink, nlink_t);
SETIFVAL(va_uid, uid_t);
SETIFVAL(va_gid, gid_t);
SETIFVAL(va_fsid, long);
SETIFVAL(va_size, u_quad_t);
SETIFVAL(va_fileid, ino_t);
SETIFVAL(va_blocksize, long);
SETIFVAL(va_atime.tv_sec, time_t);
SETIFVAL(va_ctime.tv_sec, time_t);
SETIFVAL(va_mtime.tv_sec, time_t);
SETIFVAL(va_birthtime.tv_sec, time_t);
SETIFVAL(va_atime.tv_nsec, long);
SETIFVAL(va_ctime.tv_nsec, long);
SETIFVAL(va_mtime.tv_nsec, long);
SETIFVAL(va_birthtime.tv_nsec, long);
SETIFVAL(va_gen, u_long);
SETIFVAL(va_flags, u_long);
SETIFVAL(va_rdev, dev_t);
SETIFVAL(va_bytes, u_quad_t);
#undef SETIFVAL
/* ignore va->va_vaflags */
}
void
puffs_vattr_null(struct vattr *vap)
{
vap->va_type = VNON;
/*
* Assign individually so that it is safe even if size and
* sign of each member are varied.
*/
vap->va_mode = (mode_t)PUFFS_VNOVAL;
vap->va_nlink = (nlink_t)PUFFS_VNOVAL;
vap->va_uid = (uid_t)PUFFS_VNOVAL;
vap->va_gid = (gid_t)PUFFS_VNOVAL;
vap->va_fsid = PUFFS_VNOVAL;
vap->va_fileid = (ino_t)PUFFS_VNOVAL;
vap->va_size = (u_quad_t)PUFFS_VNOVAL;
vap->va_blocksize = sysconf(_SC_PAGESIZE);
vap->va_atime.tv_sec =
vap->va_mtime.tv_sec =
vap->va_ctime.tv_sec =
vap->va_birthtime.tv_sec = PUFFS_VNOVAL;
vap->va_atime.tv_nsec =
vap->va_mtime.tv_nsec =
vap->va_ctime.tv_nsec =
vap->va_birthtime.tv_nsec = PUFFS_VNOVAL;
vap->va_rdev = (dev_t)PUFFS_VNOVAL;
vap->va_bytes = (u_quad_t)PUFFS_VNOVAL;
vap->va_flags = 0;
vap->va_gen = 0;
vap->va_vaflags = 0;
}
static int vdmap[] = {
DT_UNKNOWN, /* VNON */
DT_REG, /* VREG */
DT_DIR, /* VDIR */
DT_BLK, /* VBLK */
DT_CHR, /* VCHR */
DT_LNK, /* VLNK */
DT_SOCK, /* VSUCK*/
DT_FIFO, /* VFIFO*/
DT_UNKNOWN /* VBAD */
};
/* XXX: DT_WHT ? */
int
puffs_vtype2dt(enum vtype vt)
{
if ((int)vt >= VNON && vt < (sizeof(vdmap)/sizeof(vdmap[0])))
return vdmap[vt];
return DT_UNKNOWN;
}
enum vtype
puffs_mode2vt(mode_t mode)
{
switch (mode & S_IFMT) {
case S_IFIFO:
return VFIFO;
case S_IFCHR:
return VCHR;
case S_IFDIR:
return VDIR;
case S_IFBLK:
return VBLK;
case S_IFREG:
return VREG;
case S_IFLNK:
return VLNK;
case S_IFSOCK:
return VSOCK;
default:
return VBAD; /* XXX: not really true, but ... */
}
}
void
puffs_stat2vattr(struct vattr *va, const struct stat *sb)
{
va->va_type = puffs_mode2vt(sb->st_mode);
va->va_mode = sb->st_mode;
va->va_nlink = sb->st_nlink;
va->va_uid = sb->st_uid;
va->va_gid = sb->st_gid;
va->va_fsid = sb->st_dev;
va->va_fileid = sb->st_ino;
va->va_size = sb->st_size;
va->va_atime = sb->st_atimespec;
va->va_ctime = sb->st_ctimespec;
va->va_mtime = sb->st_mtimespec;
va->va_blocksize = sb->st_blksize;
va->va_birthtime = sb->st_birthtimespec;
va->va_gen = sb->st_gen;
va->va_flags = sb->st_flags;
va->va_rdev = sb->st_rdev;
va->va_bytes = sb->st_blocks * sb->st_blksize;
va->va_filerev = 0;
va->va_vaflags = 0;
}
mode_t
puffs_addvtype2mode(mode_t mode, enum vtype type)
{
switch (type) {
case VCHR:
mode |= S_IFCHR;
break;
case VBLK:
mode |= S_IFBLK;
break;
default:
break;
}
return mode;
}