NetBSD/sys/filecorefs/filecore_vnops.c

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/* $NetBSD: filecore_vnops.c,v 1.10 2000/11/27 08:39:42 chs Exp $ */
/*-
* Copyright (c) 1998 Andrew McMurry
* Copyright (c) 1994 The Regents of the University of California.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS 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.
*
* filecore_vnops.c 1.2 1998/8/18
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
#include <filecorefs/filecore.h>
#include <filecorefs/filecore_extern.h>
#include <filecorefs/filecore_node.h>
/*
* Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
* The mode is shifted to select the owner/group/other fields. The
* super user is granted all permissions.
*/
int
filecore_access(v)
void *v;
{
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct filecore_node *ip = VTOI(vp);
struct filecore_mnt *fcmp = ip->i_mnt;
/*
* Disallow write attempts unless the file is a socket,
* fifo, or a block or character device resident on the
* file system.
*/
if (ap->a_mode & VWRITE) {
switch (vp->v_type) {
case VDIR:
case VLNK:
case VREG:
return (EROFS);
default:
break;
}
}
return (vaccess(vp->v_type, filecore_mode(ip),
fcmp->fc_uid, fcmp->fc_gid, ap->a_mode, ap->a_cred));
}
int
filecore_getattr(v)
void *v;
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct filecore_node *ip = VTOI(vp);
struct vattr *vap = ap->a_vap;
struct filecore_mnt *fcmp = ip->i_mnt;
vap->va_fsid = ip->i_dev;
vap->va_fileid = ip->i_number;
vap->va_mode = filecore_mode(ip);
vap->va_nlink = 1;
vap->va_uid = fcmp->fc_uid;
vap->va_gid = fcmp->fc_gid;
vap->va_atime = filecore_time(ip);
vap->va_mtime = filecore_time(ip);
vap->va_ctime = filecore_time(ip);
vap->va_rdev = 0; /* We don't support specials */
vap->va_size = (u_quad_t) ip->i_size;
vap->va_flags = 0;
vap->va_gen = 1;
vap->va_blocksize = fcmp->blksize;
vap->va_bytes = vap->va_size;
vap->va_type = vp->v_type;
return (0);
}
/*
* Vnode op for reading.
*/
int
filecore_read(v)
void *v;
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct filecore_node *ip = VTOI(vp);
struct filecore_mnt *fcmp;
struct buf *bp;
daddr_t lbn, rablock;
off_t diff;
int rasize, error = 0;
long size, n, on;
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
ip->i_flag |= IN_ACCESS;
fcmp = ip->i_mnt;
if (vp->v_type == VREG) {
error = 0;
while (uio->uio_resid > 0) {
void *win;
vsize_t bytelen = min(ip->i_size - uio->uio_offset,
uio->uio_resid);
if (bytelen == 0) {
break;
}
win = ubc_alloc(&vp->v_uvm.u_obj, uio->uio_offset,
&bytelen, UBC_READ);
error = uiomove(win, bytelen, uio);
ubc_release(win, 0);
if (error) {
break;
}
}
goto out;
}
do {
lbn = lblkno(fcmp, uio->uio_offset);
on = blkoff(fcmp, uio->uio_offset);
n = min((u_int)(blksize(fcmp, ip, lbn) - on),
uio->uio_resid);
diff = (off_t)ip->i_size - uio->uio_offset;
if (diff <= 0)
return (0);
if (diff < n)
n = diff;
size = blksize(fcmp, ip, lbn);
rablock = lbn + 1;
if (ip->i_dirent.attr & FILECORE_ATTR_DIR) {
error = filecore_dbread(ip, &bp);
on = uio->uio_offset;
n = min(FILECORE_DIR_SIZE-on, uio->uio_resid);
size = FILECORE_DIR_SIZE;
} else {
if (vp->v_lastr + 1 == lbn &&
lblktosize(fcmp, rablock) < ip->i_size) {
rasize = blksize(fcmp, ip, rablock);
error = breadn(vp, lbn, size, &rablock,
&rasize, 1, NOCRED, &bp);
#ifdef FILECORE_DEBUG_BR
printf("breadn(%p, %x, %ld, CRED, %p)=%d\n",
vp, lbn, size, bp, error);
#endif
} else {
error = bread(vp, lbn, size, NOCRED, &bp);
#ifdef FILECORE_DEBUG_BR
printf("bread(%p, %x, %ld, CRED, %p)=%d\n",
vp, lbn, size, bp, error);
#endif
}
}
vp->v_lastr = lbn;
n = min(n, size - bp->b_resid);
if (error) {
#ifdef FILECORE_DEBUG_BR
printf("brelse(%p) vn1\n", bp);
#endif
brelse(bp);
return (error);
}
error = uiomove(bp->b_data + on, (int)n, uio);
#ifdef FILECORE_DEBUG_BR
printf("brelse(%p) vn2\n", bp);
#endif
brelse(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
out:
return (error);
}
/*
* Mmap a file
*
* NB Currently unsupported.
*/
/* ARGSUSED */
int
filecore_mmap(v)
void *v;
{
return (EINVAL);
}
/*
* Vnode op for readdir
*/
int
filecore_readdir(v)
void *v;
{
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
off_t **a_cookies;
int *a_ncookies;
} */ *ap = v;
struct uio *uio = ap->a_uio;
struct vnode *vdp = ap->a_vp;
struct filecore_node *dp;
struct filecore_mnt *fcmp;
struct buf *bp = NULL;
struct dirent de;
struct filecore_direntry *dep = NULL;
int error = 0;
off_t *cookies = NULL;
int ncookies = 0;
int i;
off_t uiooff;
dp = VTOI(vdp);
if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0)
return (ENOTDIR);
if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0)
return (EINVAL);
i = uio->uio_offset / FILECORE_DIRENT_SIZE;
uiooff = uio->uio_offset;
*ap->a_eofflag = 0;
fcmp = dp->i_mnt;
error = filecore_dbread(dp, &bp);
if (error) {
brelse(bp);
return error;
}
if (ap->a_ncookies == NULL)
cookies = NULL;
else {
*ap->a_ncookies = 0;
ncookies = uio->uio_resid/16;
cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
}
for (; ; i++) {
switch (i) {
case 0:
/* Fake the '.' entry */
de.d_fileno = dp->i_number;
de.d_type = DT_DIR;
de.d_namlen = 1;
strcpy(de.d_name, ".");
break;
case 1:
/* Fake the '..' entry */
de.d_fileno = filecore_getparent(dp);
de.d_type = DT_DIR;
de.d_namlen = 2;
strcpy(de.d_name, "..");
break;
default:
de.d_fileno = dp->i_dirent.addr +
((i - 2) << FILECORE_INO_INDEX);
dep = fcdirentry(bp->b_data, i - 2);
if (dep->attr & FILECORE_ATTR_DIR)
de.d_type = DT_DIR;
else
de.d_type = DT_REG;
if (filecore_fn2unix(dep->name, de.d_name,
&de.d_namlen)) {
*ap->a_eofflag = 1;
goto out;
}
break;
}
de.d_reclen = DIRENT_SIZE(&de);
if (uio->uio_resid < de.d_reclen)
goto out;
error = uiomove((caddr_t) &de, de.d_reclen, uio);
if (error)
goto out;
uiooff += FILECORE_DIRENT_SIZE;
if (cookies) {
*cookies++ = i*FILECORE_DIRENT_SIZE;
(*ap->a_ncookies)++;
if (--ncookies == 0) goto out;
}
}
out:
if (cookies) {
*ap->a_cookies = cookies;
if (error) {
free(cookies, M_TEMP);
*ap->a_ncookies = 0;
*ap->a_cookies = NULL;
}
}
uio->uio_offset = uiooff;
#ifdef FILECORE_DEBUG_BR
printf("brelse(%p) vn3\n", bp);
#endif
brelse (bp);
return (error);
}
/*
* Return target name of a symbolic link
* Shouldn't we get the parent vnode and read the data from there?
* This could eventually result in deadlocks in filecore_lookup.
* But otherwise the block read here is in the block buffer two times.
*/
int
filecore_readlink(v)
void *v;
{
#if 0
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
} */ *ap = v;
#endif
return (EINVAL);
}
int
filecore_link(v)
void *v;
{
struct vop_link_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
vput(ap->a_dvp);
return (EROFS);
}
int
filecore_symlink(v)
void *v;
{
struct vop_symlink_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap = v;
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
vput(ap->a_dvp);
return (EROFS);
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*/
int
filecore_strategy(v)
void *v;
{
struct vop_strategy_args /* {
struct buf *a_bp;
} */ *ap = v;
struct buf *bp = ap->a_bp;
struct vnode *vp = bp->b_vp;
struct filecore_node *ip;
int error;
ip = VTOI(vp);
if (bp->b_blkno == bp->b_lblkno) {
error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL);
if (error) {
bp->b_error = error;
bp->b_flags |= B_ERROR;
biodone(bp);
return (error);
}
if ((long)bp->b_blkno == -1)
clrbuf(bp);
}
if ((long)bp->b_blkno == -1) {
biodone(bp);
return (0);
}
vp = ip->i_devvp;
bp->b_dev = vp->v_rdev;
VOCALL (vp->v_op, VOFFSET(vop_strategy), ap);
return (0);
}
/*
* Print out the contents of an inode.
*/
/*ARGSUSED*/
int
filecore_print(v)
void *v;
{
printf("tag VT_FILECORE, filecore vnode\n");
return (0);
}
/*
* Return POSIX pathconf information applicable to filecore filesystems.
*/
int
filecore_pathconf(v)
void *v;
{
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
register_t *a_retval;
} */ *ap = v;
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = 1;
return (0);
case _PC_NAME_MAX:
*ap->a_retval = 10;
return (0);
case _PC_PATH_MAX:
*ap->a_retval = 256;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_NO_TRUNC:
*ap->a_retval = 1;
return (0);
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case _PC_SYNC_IO:
*ap->a_retval = 1;
return (0);
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case _PC_FILESIZEBITS:
*ap->a_retval = 32;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Global vfs data structures for isofs
*/
#define filecore_create genfs_eopnotsupp
#define filecore_mknod genfs_eopnotsupp
#define filecore_write genfs_eopnotsupp
#define filecore_setattr genfs_eopnotsupp
#ifdef NFSSERVER
int lease_check __P((void *));
#define filecore_lease_check lease_check
#else
#define filecore_lease_check genfs_nullop
#endif
#define filecore_fcntl genfs_fcntl
#define filecore_ioctl genfs_enoioctl
#define filecore_fsync genfs_nullop
#define filecore_remove genfs_eopnotsupp
#define filecore_rename genfs_eopnotsupp
#define filecore_mkdir genfs_eopnotsupp
#define filecore_rmdir genfs_eopnotsupp
#define filecore_advlock genfs_eopnotsupp
#define filecore_valloc genfs_eopnotsupp
#define filecore_vfree genfs_nullop
#define filecore_truncate genfs_eopnotsupp
#define filecore_update genfs_nullop
#define filecore_bwrite genfs_eopnotsupp
#define filecore_revoke genfs_revoke
#define filecore_blkatoff genfs_eopnotsupp
/*
* Global vfs data structures for filecore
*/
int (**filecore_vnodeop_p) __P((void *));
struct vnodeopv_entry_desc filecore_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, filecore_lookup }, /* lookup */
{ &vop_create_desc, filecore_create }, /* create */
{ &vop_mknod_desc, filecore_mknod }, /* mknod */
{ &vop_open_desc, filecore_open }, /* open */
{ &vop_close_desc, filecore_close }, /* close */
{ &vop_access_desc, filecore_access }, /* access */
{ &vop_getattr_desc, filecore_getattr }, /* getattr */
{ &vop_setattr_desc, filecore_setattr }, /* setattr */
{ &vop_read_desc, filecore_read }, /* read */
{ &vop_write_desc, filecore_write }, /* write */
{ &vop_lease_desc, filecore_lease_check }, /* lease */
{ &vop_fcntl_desc, filecore_fcntl }, /* fcntl */
{ &vop_ioctl_desc, filecore_ioctl }, /* ioctl */
{ &vop_poll_desc, filecore_poll }, /* poll */
{ &vop_revoke_desc, filecore_revoke }, /* revoke */
{ &vop_mmap_desc, filecore_mmap }, /* mmap */
{ &vop_fsync_desc, filecore_fsync }, /* fsync */
{ &vop_seek_desc, filecore_seek }, /* seek */
{ &vop_remove_desc, filecore_remove }, /* remove */
{ &vop_link_desc, filecore_link }, /* link */
{ &vop_rename_desc, filecore_rename }, /* rename */
{ &vop_mkdir_desc, filecore_mkdir }, /* mkdir */
{ &vop_rmdir_desc, filecore_rmdir }, /* rmdir */
{ &vop_symlink_desc, filecore_symlink }, /* symlink */
{ &vop_readdir_desc, filecore_readdir }, /* readdir */
{ &vop_readlink_desc, filecore_readlink }, /* readlink */
{ &vop_abortop_desc, filecore_abortop }, /* abortop */
{ &vop_inactive_desc, filecore_inactive }, /* inactive */
{ &vop_reclaim_desc, filecore_reclaim }, /* reclaim */
{ &vop_lock_desc, genfs_lock }, /* lock */
{ &vop_unlock_desc, genfs_unlock }, /* unlock */
{ &vop_bmap_desc, filecore_bmap }, /* bmap */
{ &vop_strategy_desc, filecore_strategy }, /* strategy */
{ &vop_print_desc, filecore_print }, /* print */
{ &vop_islocked_desc, genfs_islocked }, /* islocked */
{ &vop_pathconf_desc, filecore_pathconf }, /* pathconf */
{ &vop_advlock_desc, filecore_advlock }, /* advlock */
{ &vop_blkatoff_desc, filecore_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, filecore_valloc }, /* valloc */
{ &vop_vfree_desc, filecore_vfree }, /* vfree */
{ &vop_truncate_desc, filecore_truncate }, /* truncate */
{ &vop_update_desc, filecore_update }, /* update */
{ &vop_bwrite_desc, vn_bwrite }, /* bwrite */
{ &vop_getpages_desc, genfs_getpages }, /* getpages */
{ &vop_size_desc, genfs_size }, /* size */
{ NULL, NULL }
};
struct vnodeopv_desc filecore_vnodeop_opv_desc =
{ &filecore_vnodeop_p, filecore_vnodeop_entries };