Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/ufs/lfs/lfs_vfsops.c

839 lines
22 KiB
C
Raw Blame History

/* $NetBSD: lfs_vfsops.c,v 1.34 1999/06/01 03:00:40 perseant Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Konrad E. Schroder <perseant@hhhh.org>.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*-
* 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 8.20 (Berkeley) 6/10/95
*/
#if defined(_KERNEL) && !defined(_LKM)
#include "opt_quota.h"
#endif
#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/pool.h>
#include <sys/socket.h>
#include <vm/vm.h>
#include <sys/sysctl.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 *));
extern struct vnodeopv_desc lfs_vnodeop_opv_desc;
extern struct vnodeopv_desc lfs_specop_opv_desc;
extern struct vnodeopv_desc lfs_fifoop_opv_desc;
struct vnodeopv_desc *lfs_vnodeopv_descs[] = {
&lfs_vnodeop_opv_desc,
&lfs_specop_opv_desc,
&lfs_fifoop_opv_desc,
NULL,
};
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,
lfs_sysctl,
NULL,
ufs_check_export,
lfs_vnodeopv_descs,
};
struct pool lfs_inode_pool;
/*
* Initialize the filesystem, most work done by ufs_init.
*/
void
lfs_init()
{
ufs_init();
/*
* XXX Same structure as FFS inodes? Should we share a common pool?
*/
pool_init(&lfs_inode_pool, sizeof(struct inode), 0, 0, 0,
"lfsinopl", 0, pool_page_alloc_nointr, pool_page_free_nointr,
M_LFSNODE);
}
/*
* Called by main() when ufs is going to be mounted as root.
*/
int
lfs_mountroot()
{
extern struct vnode *rootvp;
struct mount *mp;
struct proc *p = curproc; /* XXX */
int error;
/*
* Get vnodes for swapdev and rootdev.
*/
if ((error = bdevvp(rootdev, &rootvp))) {
printf("lfs_mountroot: can't setup bdevvp's");
return (error);
}
if ((error = vfs_rootmountalloc(MOUNT_LFS, "root_device", &mp)))
return (error);
if ((error = lfs_mountfs(rootvp, mp, p))) {
mp->mnt_op->vfs_refcount--;
vfs_unbusy(mp);
free(mp, M_MOUNT);
return (error);
}
simple_lock(&mountlist_slock);
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
simple_unlock(&mountlist_slock);
(void)lfs_statfs(mp, &mp->mnt_stat, p);
vfs_unbusy(mp);
return (0);
}
/*
* VFS Operations.
*
* mount system call
*/
int
lfs_mount(mp, path, data, ndp, p)
register struct mount *mp;
const char *path;
void *data;
struct nameidata *ndp;
struct proc *p;
{
struct vnode *devvp;
struct ufs_args args;
struct ufsmount *ump = NULL;
register struct lfs *fs = NULL; /* LFS */
size_t size;
int error;
mode_t accessmode;
error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args));
if (error)
return (error);
#if 0
/* Until LFS can do NFS right. XXX */
if (args.export.ex_flags & MNT_EXPORTED)
return (EINVAL);
#endif
/*
* 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);
fs = ump->um_lfs;
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) {
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(ump->um_devvp, VREAD|VWRITE,
p->p_ucred, p);
VOP_UNLOCK(ump->um_devvp, 0);
if (error)
return (error);
}
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)) != 0)
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;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
if (error) {
vput(devvp);
return (error);
}
VOP_UNLOCK(devvp, 0);
}
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 */
(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);
(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;
struct dlfs *dfs, *adfs;
register struct lfs *fs;
register struct ufsmount *ump;
struct vnode *vp;
struct buf *bp, *abp;
struct partinfo dpart;
dev_t dev;
int error, i, ronly, size;
struct ucred *cred;
SEGUSE *sup;
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)) != 0)
return (error);
if (vcount(devvp) > 1 && devvp != rootvp)
return (EBUSY);
if ((error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) != 0)
return (error);
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
if (error)
return (error);
if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0)
size = DEV_BSIZE;
else
size = dpart.disklab->d_secsize;
/* Don't free random space on error. */
bp = NULL;
ump = NULL;
/* Read in the superblock. */
error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, cred, &bp);
if (error)
goto out;
dfs = (struct dlfs *)bp->b_data;
/*
* Check the second superblock to see which is newer; then mount
* using the older of the two. This is necessary to ensure that
* the filesystem is valid if it was not unmounted cleanly.
*/
error = bread(devvp, dfs->dlfs_sboffs[1], LFS_SBPAD, cred, &abp);
if (error)
goto out;
adfs = (struct dlfs *)abp->b_data;
if (adfs->dlfs_tstamp < dfs->dlfs_tstamp) /* XXX KS - 1s resolution? */
dfs = adfs;
/* Check the basics. */
if (dfs->dlfs_magic != LFS_MAGIC || dfs->dlfs_bsize > MAXBSIZE ||
dfs->dlfs_version > LFS_VERSION ||
dfs->dlfs_bsize < sizeof(struct dlfs)) {
error = EINVAL; /* XXX needs translation */
goto out;
}
/* Allocate the mount structure, copy the superblock into it. */
fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK);
memcpy(&fs->lfs_dlfs, dfs, sizeof(struct dlfs));
ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
memset((caddr_t)ump, 0, sizeof *ump);
ump->um_lfs = fs;
if (sizeof(struct lfs) < LFS_SBPAD) /* XXX why? */
bp->b_flags |= B_INVAL;
brelse(bp);
bp = NULL;
brelse(abp);
abp = NULL;
/* Set up the I/O information */
fs->lfs_iocount = 0;
fs->lfs_dirvcount = 0;
fs->lfs_diropwait = 0;
fs->lfs_activesb = 0;
#ifdef LFS_CANNOT_ROLLFW
fs->lfs_sbactive = NULL;
#endif
#ifdef LFS_TRACK_IOS
for (i=0;i<LFS_THROTTLE;i++)
fs->lfs_pending[i] = LFS_UNUSED_DADDR;
#endif
/* 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_flags = 0;
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)) != 0)
goto out;
fs->lfs_ivnode = vp;
VREF(vp);
vput(vp);
/*
* Mark the current segment as ACTIVE, since we're going to
* be writing to it.
*/
LFS_SEGENTRY(sup, fs, datosn(fs, fs->lfs_offset), bp);
sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE;
(void) VOP_BWRITE(bp);
return (0);
out:
if (bp)
brelse(bp);
if (abp)
brelse(abp);
(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
*/
int
lfs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
register struct ufsmount *ump;
register struct lfs *fs;
int error, flags, ronly;
extern int lfs_allclean_wakeup;
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
ump = VFSTOUFS(mp);
fs = ump->um_lfs;
#ifdef QUOTA
if (mp->mnt_flag & MNT_QUOTA) {
int i;
error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags);
if (error)
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)) != 0)
return (error);
fs->lfs_clean = 1;
if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0)
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);
/* XXX KS - wake up the cleaner so it can die */
wakeup(&fs->lfs_nextseg);
wakeup(&lfs_allclean_wakeup);
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.
*/
int
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_fsize;
sbp->f_iosize = fs->lfs_bsize;
sbp->f_blocks = dbtofrags(fs, fs->lfs_dsize);
sbp->f_bfree = dbtofrags(fs, fs->lfs_bfree);
/*
* To compute the available space. Subtract the minimum free
* from the total number of blocks in the file system. Set avail
* to the smaller of this number and fs->lfs_bfree.
*
* XXX KS - is my modification below what is desired? (This
* will, e.g., change the report when the cleaner runs.)
*/
#if 0
sbp->f_bavail = (long) ((u_int64_t) fs->lfs_dsize * (u_int64_t)
(100 - fs->lfs_minfree) / (u_int64_t) 100);
sbp->f_bavail =
sbp->f_bavail > fs->lfs_bfree ? fs->lfs_bfree : sbp->f_bavail;
#else
sbp->f_bavail = (long) ((u_int64_t) fs->lfs_dsize * (u_int64_t)
(100 - fs->lfs_minfree) / (u_int64_t) 100)
- (u_int64_t)(fs->lfs_dsize - fs->lfs_bfree);
#endif
sbp->f_bavail = dbtofrags(fs, sbp->f_bavail);
sbp->f_files = dbtofsb(fs,fs->lfs_bfree) * INOPB(fs);
sbp->f_ffree = sbp->f_files - fs->lfs_nfiles;
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);
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'.
*/
int
lfs_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
int error;
struct lfs *fs;
fs = ((struct ufsmount *)mp->mnt_data)->ufsmount_u.lfs;
while(fs->lfs_dirops)
error = tsleep(&fs->lfs_dirops, PRIBIO + 1, "lfs_dirops", 0);
fs->lfs_writer++;
/* All syncs must be checkpoints until roll-forward is implemented. */
error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0));
if(--fs->lfs_writer==0)
wakeup(&fs->lfs_dirops);
#ifdef QUOTA
qsync(mp);
#endif
return (error);
}
#ifdef USE_UFS_HASHLOCK
extern struct lock ufs_hashlock;
#endif
/*
* 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;
ufs_daddr_t daddr;
dev_t dev;
int error;
#ifdef LFS_ATIME_IFILE
struct timespec ts;
#endif
ump = VFSTOUFS(mp);
dev = ump->um_dev;
#ifdef USE_UFS_HASHLOCK
do {
#endif
if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
return (0);
#ifdef USE_UFS_HASHLOCK
} while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0));
#endif
/* 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;
#ifdef LFS_ATIME_IFILE
ts = ifp->if_atime; /* structure copy */
#endif
brelse(bp);
if (daddr == LFS_UNUSED_DADDR) {
#ifdef USE_UFS_HASHLOCK
lockmgr(&ufs_hashlock, LK_RELEASE, 0);
#endif
return (ENOENT);
}
}
/* Allocate new vnode/inode. */
if ((error = lfs_vcreate(mp, ino, &vp)) != 0) {
*vpp = NULL;
#ifdef USE_UFS_HASHLOCK
lockmgr(&ufs_hashlock, LK_RELEASE, 0);
#endif
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);
#ifdef USE_UFS_HASHLOCK
lockmgr(&ufs_hashlock, LK_RELEASE, 0);
#endif
/*
* 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. */
error = bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp);
if (error) {
/*
* 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.ffs_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data);
#ifdef LFS_ATIME_IFILE
ip->i_ffs_atime = ts.tv_sec;
ip->i_ffs_atimensec = ts.tv_nsec;
#endif
brelse(bp);
/*
* Initialize the vnode from the inode, check for aliases. In all
* cases re-init ip, the underlying vnode/inode may have changed.
*/
error = ufs_vinit(mp, lfs_specop_p, lfs_fifoop_p, &vp);
if (error) {
vput(vp);
*vpp = NULL;
return (error);
}
if(vp->v_type == VNON) {
printf("lfs_vget: ino %d is type VNON! (ifmt %o)\n", ip->i_number, (ip->i_ffs_mode&IFMT)>>12);
#ifdef DDB
Debugger();
#endif
}
/*
* 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)
*
* 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, vpp)
register struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
register struct ufid *ufhp;
ufhp = (struct ufid *)fhp;
if (ufhp->ufid_ino < ROOTINO)
return (ESTALE);
return (ufs_fhtovp(mp, ufhp, vpp));
}
/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
int
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_ffs_gen;
return (0);
}
int
lfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
extern int lfs_writeindir, lfs_dostats, lfs_clean_vnhead;
extern struct lfs_stats lfs_stats;
int error;
/* all sysctl names at this level are terminal */
if (namelen != 1)
return (ENOTDIR);
switch (name[0]) {
case LFS_WRITEINDIR:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&lfs_writeindir));
case LFS_CLEAN_VNHEAD:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&lfs_clean_vnhead));
case LFS_DOSTATS:
if((error = sysctl_int(oldp, oldlenp, newp, newlen,
&lfs_dostats)))
return error;
if(lfs_dostats == 0)
memset(&lfs_stats,0,sizeof(lfs_stats));
return 0;
case LFS_STATS:
return (sysctl_rdstruct(oldp, oldlenp, newp,
&lfs_stats, sizeof(lfs_stats)));
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
Reference in New Issue View Git Blame Copy Permalink