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NetBSD/sys/ufs/lfs/lfs_vfsops.c

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/* $NetBSD: lfs_vfsops.c,v 1.6 1995/01/18 09:44:36 mycroft Exp $ */
/*
* Copyright (c) 1989, 1991, 1993, 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.
*
* @(#)lfs_vfsops.c 8.10 (Berkeley) 11/21/94
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/file.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <miscfs/specfs/specdev.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>
int lfs_mountfs __P((struct vnode *, struct mount *, struct proc *));
struct vfsops lfs_vfsops = {
MOUNT_LFS,
lfs_mount,
ufs_start,
lfs_unmount,
ufs_root,
ufs_quotactl,
lfs_statfs,
lfs_sync,
lfs_vget,
lfs_fhtovp,
lfs_vptofh,
lfs_init,
};
int
lfs_mountroot()
{
panic("lfs_mountroot"); /* XXX -- implement */
}
/*
* VFS Operations.
*
* mount system call
*/
lfs_mount(mp, path, data, ndp, p)
register struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct proc *p;
{
struct vnode *devvp;
struct ufs_args args;
struct ufsmount *ump;
register struct lfs *fs; /* LFS */
u_int size;
int error;
mode_t accessmode;
if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
return (error);
/* Until LFS can do NFS right. XXX */
if (args.export.ex_flags & MNT_EXPORTED)
return (EINVAL);
/*
* If updating, check whether changing from read-only to
* read/write; if there is no device name, that's all we do.
*/
if (mp->mnt_flag & MNT_UPDATE) {
ump = VFSTOUFS(mp);
if (fs->lfs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) {
/*
* If upgrade to read-write by non-root, then verify
* that user has necessary permissions on the device.
*/
if (p->p_ucred->cr_uid != 0) {
VOP_LOCK(ump->um_devvp);
if (error = VOP_ACCESS(ump->um_devvp,
VREAD | VWRITE, p->p_ucred, p)) {
VOP_UNLOCK(ump->um_devvp);
return (error);
}
VOP_UNLOCK(ump->um_devvp);
}
fs->lfs_ronly = 0;
}
if (args.fspec == 0) {
/*
* Process export requests.
*/
return (vfs_export(mp, &ump->um_export, &args.export));
}
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
if (error = namei(ndp))
return (error);
devvp = ndp->ni_vp;
if (devvp->v_type != VBLK) {
vrele(devvp);
return (ENOTBLK);
}
if (major(devvp->v_rdev) >= nblkdev) {
vrele(devvp);
return (ENXIO);
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*/
if (p->p_ucred->cr_uid != 0) {
accessmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
VOP_LOCK(devvp);
if (error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) {
vput(devvp);
return (error);
}
VOP_UNLOCK(devvp);
}
if ((mp->mnt_flag & MNT_UPDATE) == 0)
error = lfs_mountfs(devvp, mp, p); /* LFS */
else {
if (devvp != ump->um_devvp)
error = EINVAL; /* needs translation */
else
vrele(devvp);
}
if (error) {
vrele(devvp);
return (error);
}
ump = VFSTOUFS(mp);
fs = ump->um_lfs; /* LFS */
#ifdef NOTLFS /* LFS */
(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
#else
(void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size);
bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size);
bcopy(fs->lfs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
#endif
(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
return (0);
}
/*
* Common code for mount and mountroot
* LFS specific
*/
int
lfs_mountfs(devvp, mp, p)
register struct vnode *devvp;
struct mount *mp;
struct proc *p;
{
extern struct vnode *rootvp;
register struct lfs *fs;
register struct ufsmount *ump;
struct vnode *vp;
struct buf *bp;
struct partinfo dpart;
dev_t dev;
int error, i, ronly, size;
struct ucred *cred;
cred = p ? p->p_ucred : NOCRED;
/*
* Disallow multiple mounts of the same device.
* Disallow mounting of a device that is currently in use
* (except for root, which might share swap device for miniroot).
* Flush out any old buffers remaining from a previous use.
*/
if (error = vfs_mountedon(devvp))
return (error);
if (vcount(devvp) > 1 && devvp != rootvp)
return (EBUSY);
if (error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0))
return (error);
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
return (error);
if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0)
size = DEV_BSIZE;
else {
size = dpart.disklab->d_secsize;
#ifdef NEVER_USED
dpart.part->p_fstype = FS_LFS;
dpart.part->p_fsize = fs->lfs_fsize; /* frag size */
dpart.part->p_frag = fs->lfs_frag; /* frags per block */
dpart.part->p_cpg = fs->lfs_segshift; /* segment shift */
#endif
}
/* Don't free random space on error. */
bp = NULL;
ump = NULL;
/* Read in the superblock. */
if (error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, cred, &bp))
goto out;
fs = (struct lfs *)bp->b_data;
/* Check the basics. */
if (fs->lfs_magic != LFS_MAGIC || fs->lfs_bsize > MAXBSIZE ||
fs->lfs_bsize < sizeof(struct lfs)) {
error = EINVAL; /* XXX needs translation */
goto out;
}
/* Allocate the mount structure, copy the superblock into it. */
ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
fs = ump->um_lfs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK);
bcopy(bp->b_data, fs, sizeof(struct lfs));
if (sizeof(struct lfs) < LFS_SBPAD) /* XXX why? */
bp->b_flags |= B_INVAL;
brelse(bp);
bp = NULL;
/* Set up the I/O information */
fs->lfs_iocount = 0;
/* Set up the ifile and lock aflags */
fs->lfs_doifile = 0;
fs->lfs_writer = 0;
fs->lfs_dirops = 0;
fs->lfs_seglock = 0;
/* Set the file system readonly/modify bits. */
fs->lfs_ronly = ronly;
if (ronly == 0)
fs->lfs_fmod = 1;
/* Initialize the mount structure. */
dev = devvp->v_rdev;
mp->mnt_data = (qaddr_t)ump;
mp->mnt_stat.f_fsid.val[0] = (long)dev;
mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS);
mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen;
mp->mnt_flag |= MNT_LOCAL;
ump->um_mountp = mp;
ump->um_dev = dev;
ump->um_devvp = devvp;
ump->um_bptrtodb = 0;
ump->um_seqinc = 1 << fs->lfs_fsbtodb;
ump->um_nindir = fs->lfs_nindir;
for (i = 0; i < MAXQUOTAS; i++)
ump->um_quotas[i] = NULLVP;
devvp->v_specflags |= SI_MOUNTEDON;
/*
* We use the ifile vnode for almost every operation. Instead of
* retrieving it from the hash table each time we retrieve it here,
* artificially increment the reference count and keep a pointer
* to it in the incore copy of the superblock.
*/
if (error = VFS_VGET(mp, LFS_IFILE_INUM, &vp))
goto out;
fs->lfs_ivnode = vp;
VREF(vp);
vput(vp);
return (0);
out:
if (bp)
brelse(bp);
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p);
if (ump) {
free(ump->um_lfs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
}
return (error);
}
/*
* unmount system call
*/
lfs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
extern int doforce;
register struct ufsmount *ump;
register struct lfs *fs;
int i, error, flags, ronly;
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
ump = VFSTOUFS(mp);
fs = ump->um_lfs;
#ifdef QUOTA
if (mp->mnt_flag & MNT_QUOTA) {
if (error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags))
return (error);
for (i = 0; i < MAXQUOTAS; i++) {
if (ump->um_quotas[i] == NULLVP)
continue;
quotaoff(p, mp, i);
}
/*
* Here we fall through to vflush again to ensure
* that we have gotten rid of all the system vnodes.
*/
}
#endif
if (error = vflush(mp, fs->lfs_ivnode, flags))
return (error);
fs->lfs_clean = 1;
if (error = VFS_SYNC(mp, 1, p->p_ucred, p))
return (error);
if (fs->lfs_ivnode->v_dirtyblkhd.lh_first)
panic("lfs_unmount: still dirty blocks on ifile vnode\n");
vrele(fs->lfs_ivnode);
vgone(fs->lfs_ivnode);
ronly = !fs->lfs_ronly;
ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
error = VOP_CLOSE(ump->um_devvp,
ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
vrele(ump->um_devvp);
free(fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
/*
* Get file system statistics.
*/
lfs_statfs(mp, sbp, p)
struct mount *mp;
register struct statfs *sbp;
struct proc *p;
{
register struct lfs *fs;
register struct ufsmount *ump;
ump = VFSTOUFS(mp);
fs = ump->um_lfs;
if (fs->lfs_magic != LFS_MAGIC)
panic("lfs_statfs: magic");
sbp->f_type = 0;
sbp->f_bsize = fs->lfs_bsize;
sbp->f_iosize = fs->lfs_bsize;
sbp->f_blocks = dbtofsb(fs,fs->lfs_dsize);
sbp->f_bfree = dbtofsb(fs, fs->lfs_bfree);
sbp->f_bavail = (fs->lfs_dsize * (100 - fs->lfs_minfree) / 100) -
(fs->lfs_dsize - fs->lfs_bfree);
sbp->f_bavail = dbtofsb(fs, sbp->f_bavail);
sbp->f_files = fs->lfs_nfiles;
sbp->f_ffree = sbp->f_bfree * INOPB(fs);
if (sbp != &mp->mnt_stat) {
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
}
strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
sbp->f_fstypename[MFSNAMELEN] = '\0';
return (0);
}
/*
* Go through the disk queues to initiate sandbagged IO;
* go through the inodes to write those that have been modified;
* initiate the writing of the super block if it has been modified.
*
* Note: we are always called with the filesystem marked `MPBUSY'.
*/
lfs_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
int error;
/* All syncs must be checkpoints until roll-forward is implemented. */
error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0));
#ifdef QUOTA
qsync(mp);
#endif
return (error);
}
/*
* Look up an LFS dinode number to find its incore vnode. If not already
* in core, read it in from the specified device. Return the inode locked.
* Detection and handling of mount points must be done by the calling routine.
*/
int
lfs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
register struct lfs *fs;
register struct inode *ip;
struct buf *bp;
struct ifile *ifp;
struct vnode *vp;
struct ufsmount *ump;
daddr_t daddr;
dev_t dev;
int error;
ump = VFSTOUFS(mp);
dev = ump->um_dev;
if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
return (0);
/* Translate the inode number to a disk address. */
fs = ump->um_lfs;
if (ino == LFS_IFILE_INUM)
daddr = fs->lfs_idaddr;
else {
LFS_IENTRY(ifp, fs, ino, bp);
daddr = ifp->if_daddr;
brelse(bp);
if (daddr == LFS_UNUSED_DADDR)
return (ENOENT);
}
/* Allocate new vnode/inode. */
if (error = lfs_vcreate(mp, ino, &vp)) {
*vpp = NULL;
return (error);
}
/*
* Put it onto its hash chain and lock it so that other requests for
* this inode will block if they arrive while we are sleeping waiting
* for old data structures to be purged or for the contents of the
* disk portion of this inode to be read.
*/
ip = VTOI(vp);
ufs_ihashins(ip);
/*
* XXX
* This may not need to be here, logically it should go down with
* the i_devvp initialization.
* Ask Kirk.
*/
ip->i_lfs = ump->um_lfs;
/* Read in the disk contents for the inode, copy into the inode. */
if (error =
bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp)) {
/*
* The inode does not contain anything useful, so it would
* be misleading to leave it on its hash chain. With mode
* still zero, it will be unlinked and returned to the free
* list by vput().
*/
vput(vp);
brelse(bp);
*vpp = NULL;
return (error);
}
ip->i_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data);
brelse(bp);
/*
* Initialize the vnode from the inode, check for aliases. In all
* cases re-init ip, the underlying vnode/inode may have changed.
*/
if (error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp)) {
vput(vp);
*vpp = NULL;
return (error);
}
/*
* Finish inode initialization now that aliasing has been resolved.
*/
ip->i_devvp = ump->um_devvp;
VREF(ip->i_devvp);
*vpp = vp;
return (0);
}
/*
* File handle to vnode
*
* Have to be really careful about stale file handles:
* - check that the inode number is valid
* - call lfs_vget() to get the locked inode
* - check for an unallocated inode (i_mode == 0)
* - check that the given client host has export rights and return
* those rights via. exflagsp and credanonp
*
* XXX
* use ifile to see if inode is allocated instead of reading off disk
* what is the relationship between my generational number and the NFS
* generational number.
*/
int
lfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
register struct mount *mp;
struct fid *fhp;
struct mbuf *nam;
struct vnode **vpp;
int *exflagsp;
struct ucred **credanonp;
{
register struct ufid *ufhp;
ufhp = (struct ufid *)fhp;
if (ufhp->ufid_ino < ROOTINO)
return (ESTALE);
return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
}
/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
lfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
register struct inode *ip;
register struct ufid *ufhp;
ip = VTOI(vp);
ufhp = (struct ufid *)fhp;
ufhp->ufid_len = sizeof(struct ufid);
ufhp->ufid_ino = ip->i_number;
ufhp->ufid_gen = ip->i_gen;
return (0);
}
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