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NetBSD/sys/ufs/lfs/lfs_vfsops.c

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/* $NetBSD: lfs_vfsops.c,v 1.65 2001/05/30 11:57:19 mrg Exp $ */
/*-
* Copyright (c) 1999, 2000 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_OPT)
#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/device.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 <uvm/uvm_extern.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 const struct vnodeopv_desc lfs_vnodeop_opv_desc;
extern const struct vnodeopv_desc lfs_specop_opv_desc;
extern const struct vnodeopv_desc lfs_fifoop_opv_desc;
const struct vnodeopv_desc * const 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_done,
lfs_sysctl,
lfs_mountroot,
ufs_check_export,
lfs_vnodeopv_descs,
};
struct pool lfs_inode_pool;
extern int locked_queue_count;
extern long locked_queue_bytes;
/*
* 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);
}
void
lfs_done()
{
ufs_done();
pool_destroy(&lfs_inode_pool);
}
/*
* 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;
if (root_device->dv_class != DV_DISK)
return (ENODEV);
if (rootdev == NODEV)
return (ENODEV);
/*
* 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))) {
vrele(rootvp);
return (error);
}
if ((error = lfs_mountfs(rootvp, mp, p))) {
mp->mnt_op->vfs_refcount--;
vfs_unbusy(mp);
free(mp, M_MOUNT);
vrele(rootvp);
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);
inittodr(VFSTOUFS(mp)->um_lfs->lfs_tstamp);
return (0);
}
/*
* VFS Operations.
*
* mount system call
*/
int
lfs_mount(mp, path, data, ndp, p)
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;
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);
}
#ifdef LFS_DO_ROLLFORWARD
/*
* Roll-forward code.
*/
/*
* Load the appropriate indirect block, and change the appropriate pointer.
* Mark the block dirty. Do segment and avail accounting.
*/
static int
update_meta(struct lfs *fs, ino_t ino, int version, ufs_daddr_t lbn,
daddr_t ndaddr, size_t size, struct proc *p)
{
int error;
struct vnode *vp;
struct inode *ip;
daddr_t odaddr, ooff;
struct indir a[NIADDR], *ap;
struct buf *bp;
SEGUSE *sup;
int num;
if ((error = lfs_rf_valloc(fs, ino, version, p, &vp)) != 0) {
printf("update_meta: ino %d: lfs_rf_valloc returned %d\n", ino,
error);
return error;
}
if ((error = VOP_BALLOC(vp, (lbn << fs->lfs_bshift), size,
NOCRED, 0, &bp)) != 0) {
vput(vp);
return (error);
}
/* No need to write, the block is already on disk */
if (bp->b_flags & B_DELWRI) {
LFS_UNLOCK_BUF(bp);
fs->lfs_avail += btodb(bp->b_bcount);
}
bp->b_flags |= B_INVAL;
brelse(bp);
/*
* Extend the file, if it is not large enough already.
* XXX this is not exactly right, we don't know how much of the
* XXX last block is actually used. We hope that an inode will
* XXX appear later to give the correct size.
*/
ip = VTOI(vp);
if (ip->i_ffs_size <= (lbn << fs->lfs_bshift)) {
if (lbn < NDADDR)
ip->i_ffs_size = (lbn << fs->lfs_bshift) +
(size - fs->lfs_fsize) + 1;
else
ip->i_ffs_size = (lbn << fs->lfs_bshift) + 1;
}
error = ufs_bmaparray(vp, lbn, &odaddr, &a[0], &num, NULL);
if (error) {
printf("update_meta: ufs_bmaparray returned %d\n", error);
vput(vp);
return error;
}
switch (num) {
case 0:
ooff = ip->i_ffs_db[lbn];
if (ooff == UNWRITTEN)
ip->i_ffs_blocks += btodb(size);
ip->i_ffs_db[lbn] = ndaddr;
break;
case 1:
ooff = ip->i_ffs_ib[a[0].in_off];
if (ooff == UNWRITTEN)
ip->i_ffs_blocks += btodb(size);
ip->i_ffs_ib[a[0].in_off] = ndaddr;
break;
default:
ap = &a[num - 1];
if (bread(vp, ap->in_lbn, fs->lfs_bsize, NOCRED, &bp))
panic("update_meta: bread bno %d", ap->in_lbn);
ooff = ((ufs_daddr_t *)bp->b_data)[ap->in_off];
if (ooff == UNWRITTEN)
ip->i_ffs_blocks += btodb(size);
((ufs_daddr_t *)bp->b_data)[ap->in_off] = ndaddr;
(void) VOP_BWRITE(bp);
}
LFS_SET_UINO(ip, IN_CHANGE | IN_MODIFIED | IN_UPDATE);
/* Update segment usage information. */
if (odaddr > 0) {
LFS_SEGENTRY(sup, fs, datosn(fs, odaddr), bp);
#ifdef DIAGNOSTIC
if (sup->su_nbytes < size) {
panic("update_meta: negative bytes "
"(segment %d short by %ld)\n",
datosn(fs, odaddr), (long)size - sup->su_nbytes);
sup->su_nbytes = size;
}
#endif
sup->su_nbytes -= size;
VOP_BWRITE(bp);
}
LFS_SEGENTRY(sup, fs, datosn(fs, ndaddr), bp);
sup->su_nbytes += size;
VOP_BWRITE(bp);
/* Fix this so it can be released */
/* ip->i_lfs_effnblks = ip->i_ffs_blocks; */
/* Now look again to make sure it worked */
ufs_bmaparray(vp, lbn, &odaddr, &a[0], &num, NULL );
if (odaddr != ndaddr)
printf("update_meta: failed setting ino %d lbn %d to %x\n",
ino, lbn, ndaddr);
vput(vp);
return 0;
}
static int
update_inoblk(struct lfs *fs, daddr_t offset, struct ucred *cred,
struct proc *p)
{
struct vnode *devvp, *vp;
struct inode *ip;
struct dinode *dip;
struct buf *dbp, *ibp;
int error;
daddr_t daddr;
IFILE *ifp;
SEGUSE *sup;
devvp = VTOI(fs->lfs_ivnode)->i_devvp;
/*
* Get the inode, update times and perms.
* DO NOT update disk blocks, we do that separately.
*/
error = bread(devvp, offset, fs->lfs_bsize, cred, &dbp);
if (error) {
printf("update_inoblk: bread returned %d\n", error);
return error;
}
dip = ((struct dinode *)(dbp->b_data)) + INOPB(fs);
while(--dip >= (struct dinode *)dbp->b_data) {
if(dip->di_inumber > LFS_IFILE_INUM) {
/* printf("ino %d version %d\n", dip->di_inumber,
dip->di_gen); */
error = lfs_rf_valloc(fs, dip->di_inumber, dip->di_gen,
p, &vp);
if (error) {
printf("update_inoblk: lfs_rf_valloc returned %d\n", error);
continue;
}
ip = VTOI(vp);
if (dip->di_size != ip->i_ffs_size)
VOP_TRUNCATE(vp, dip->di_size, 0, NOCRED, p);
/* Get mode, link count, size, and times */
memcpy(&ip->i_din.ffs_din, dip,
offsetof(struct dinode, di_db[0]));
/* Then the rest, except di_blocks */
ip->i_ffs_flags = dip->di_flags;
ip->i_ffs_gen = dip->di_gen;
ip->i_ffs_uid = dip->di_uid;
ip->i_ffs_gid = dip->di_gid;
ip->i_ffs_effnlink = dip->di_nlink;
LFS_SET_UINO(ip, IN_CHANGE | IN_MODIFIED | IN_UPDATE);
/* Re-initialize to get type right */
ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p,
&vp);
vput(vp);
/* Record change in location */
LFS_IENTRY(ifp, fs, dip->di_inumber, ibp);
daddr = ifp->if_daddr;
ifp->if_daddr = dbp->b_blkno;
error = VOP_BWRITE(ibp); /* Ifile */
/* And do segment accounting */
if (datosn(fs, daddr) != datosn(fs, dbp->b_blkno)) {
if (daddr > 0) {
LFS_SEGENTRY(sup, fs, datosn(fs, daddr),
ibp);
sup->su_nbytes -= DINODE_SIZE;
VOP_BWRITE(ibp);
}
LFS_SEGENTRY(sup, fs, datosn(fs, dbp->b_blkno),
ibp);
sup->su_nbytes += DINODE_SIZE;
VOP_BWRITE(ibp);
}
}
}
dbp->b_flags |= B_AGE;
brelse(dbp);
return 0;
}
#define CHECK_CKSUM 0x0001 /* Check the checksum to make sure it's valid */
#define CHECK_UPDATE 0x0002 /* Update Ifile for new data blocks / inodes */
static daddr_t
check_segsum(struct lfs *fs, daddr_t offset,
struct ucred *cred, int flags, int *pseg_flags, struct proc *p)
{
struct vnode *devvp;
struct buf *bp, *dbp;
int error, nblocks, ninos, i, j;
SEGSUM *ssp;
u_long *dp, *datap; /* XXX u_int32_t */
daddr_t *iaddr, oldoffset;
FINFO *fip;
SEGUSE *sup;
size_t size;
devvp = VTOI(fs->lfs_ivnode)->i_devvp;
/*
* If the segment has a superblock and we're at the top
* of the segment, skip the superblock.
*/
if(sntoda(fs, datosn(fs, offset)) == offset) {
LFS_SEGENTRY(sup, fs, datosn(fs, offset), bp);
if(sup->su_flags & SEGUSE_SUPERBLOCK)
offset += btodb(LFS_SBPAD);
brelse(bp);
}
/* Read in the segment summary */
error = bread(devvp, offset, LFS_SUMMARY_SIZE, cred, &bp);
if(error)
return -1;
/* Check summary checksum */
ssp = (SEGSUM *)bp->b_data;
if(flags & CHECK_CKSUM) {
if(ssp->ss_sumsum != cksum(&ssp->ss_datasum,
LFS_SUMMARY_SIZE -
sizeof(ssp->ss_sumsum))) {
#ifdef DEBUG_LFS_RFW
printf("Sumsum error at 0x%x\n", offset);
#endif
offset = -1;
goto err1;
}
if (ssp->ss_nfinfo == 0 && ssp->ss_ninos == 0) {
#ifdef DEBUG_LFS_RFW
printf("Empty pseg at 0x%x\n", offset);
#endif
offset = -1;
goto err1;
}
if (ssp->ss_create < fs->lfs_tstamp) {
#ifdef DEBUG_LFS_RFW
printf("Old data at 0x%x\n", offset);
#endif
offset = -1;
goto err1;
}
}
if(pseg_flags)
*pseg_flags = ssp->ss_flags;
oldoffset = offset;
offset += btodb(LFS_SUMMARY_SIZE);
ninos = howmany(ssp->ss_ninos, INOPB(fs));
iaddr = (daddr_t *)(bp->b_data + LFS_SUMMARY_SIZE - sizeof(daddr_t));
if(flags & CHECK_CKSUM) {
/* Count blocks */
nblocks = 0;
fip = (FINFO *)(bp->b_data + sizeof(SEGSUM));
for(i = 0; i < ssp->ss_nfinfo; ++i) {
nblocks += fip->fi_nblocks;
if(fip->fi_nblocks <= 0)
break;
fip = (FINFO *)(((char *)fip) + sizeof(FINFO) +
(fip->fi_nblocks - 1) *
sizeof(ufs_daddr_t));
}
nblocks += ninos;
/* Create the sum array */
datap = dp = (u_long *)malloc(nblocks * sizeof(u_long),
M_SEGMENT, M_WAITOK);
}
/* Handle individual blocks */
fip = (FINFO *)(bp->b_data + sizeof(SEGSUM));
for(i = 0; i < ssp->ss_nfinfo || ninos; ++i) {
/* Inode block? */
if(ninos && *iaddr == offset) {
if(flags & CHECK_CKSUM) {
/* Read in the head and add to the buffer */
error = bread(devvp, offset, fs->lfs_bsize,
cred, &dbp);
if(error) {
offset = -1;
goto err2;
}
(*dp++) = ((u_long *)(dbp->b_data))[0];
dbp->b_flags |= B_AGE;
brelse(dbp);
}
if(flags & CHECK_UPDATE) {
if ((error = update_inoblk(fs, offset, cred, p))
!= 0) {
offset = -1;
goto err2;
}
}
offset += fsbtodb(fs,1);
--iaddr;
--ninos;
--i; /* compensate */
continue;
}
/* printf("check: blocks from ino %d version %d\n",
fip->fi_ino, fip->fi_version); */
size = fs->lfs_bsize;
for(j = 0; j < fip->fi_nblocks; ++j) {
if (j == fip->fi_nblocks - 1)
size = fip->fi_lastlength;
if(flags & CHECK_CKSUM) {
error = bread(devvp, offset, size, cred, &dbp);
if(error) {
offset = -1;
goto err2;
}
(*dp++) = ((u_long *)(dbp->b_data))[0];
dbp->b_flags |= B_AGE;
brelse(dbp);
}
/* Account for and update any direct blocks */
if((flags & CHECK_UPDATE) &&
fip->fi_ino > LFS_IFILE_INUM &&
fip->fi_blocks[j] >= 0) {
update_meta(fs, fip->fi_ino, fip->fi_version,
fip->fi_blocks[j], offset, size, p);
}
offset += btodb(size);
}
fip = (FINFO *)(((char *)fip) + sizeof(FINFO)
+ (fip->fi_nblocks - 1) * sizeof(ufs_daddr_t));
}
/* Checksum the array, compare */
if((flags & CHECK_CKSUM) &&
ssp->ss_datasum != cksum(datap, nblocks * sizeof(u_long)))
{
printf("Datasum error at 0x%x (wanted %x got %x)\n", offset,
ssp->ss_datasum, cksum(datap, nblocks *
sizeof(u_long)));
offset = -1;
goto err2;
}
/* If we're at the end of the segment, move to the next */
if(datosn(fs, offset + btodb(LFS_SUMMARY_SIZE + fs->lfs_bsize)) !=
datosn(fs, offset)) {
if (datosn(fs, offset) == datosn(fs, ssp->ss_next)) {
offset = -1;
goto err2;
}
offset = ssp->ss_next;
#ifdef DEBUG_LFS_RFW
printf("LFS roll forward: moving on to offset 0x%x "
" -> segment %d\n", offset, datosn(fs,offset));
#endif
}
if (flags & CHECK_UPDATE) {
fs->lfs_avail -= (offset - oldoffset);
/* Don't clog the buffer queue */
if (locked_queue_count > LFS_MAX_BUFS ||
locked_queue_bytes > LFS_MAX_BYTES) {
++fs->lfs_writer;
lfs_flush(fs, SEGM_CKP);
if(--fs->lfs_writer==0)
wakeup(&fs->lfs_dirops);
}
}
err2:
if(flags & CHECK_CKSUM)
free(datap, M_SEGMENT);
err1:
bp->b_flags |= B_AGE;
brelse(bp);
return offset;
}
#endif /* LFS_DO_ROLLFORWARD */
/*
* Common code for mount and mountroot
* LFS specific
*/
int
lfs_mountfs(devvp, mp, p)
struct vnode *devvp;
struct mount *mp;
struct proc *p;
{
extern struct vnode *rootvp;
struct dlfs *tdfs, *dfs, *adfs;
struct lfs *fs;
struct ufsmount *ump;
struct vnode *vp;
struct buf *bp, *abp;
struct partinfo dpart;
dev_t dev;
int error, i, ronly, size;
struct ucred *cred;
CLEANERINFO *cip;
SEGUSE *sup;
#ifdef LFS_DO_ROLLFORWARD
int flags, dirty;
daddr_t offset, oldoffset, lastgoodpseg;
int sn, curseg;
#endif
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;
abp = 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 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;
}
/*
* 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.
*/
if (dfs->dlfs_sboffs[1] &&
dfs->dlfs_sboffs[1]-(LFS_LABELPAD/size) > LFS_SBPAD/size)
{
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 1s? */
tdfs = adfs;
else
tdfs = dfs;
/* Check the basics. */
if (tdfs->dlfs_magic != LFS_MAGIC ||
tdfs->dlfs_bsize > MAXBSIZE ||
tdfs->dlfs_version > LFS_VERSION ||
tdfs->dlfs_bsize < sizeof(struct dlfs)) {
error = EINVAL; /* XXX needs translation */
goto out;
}
} else {
printf("lfs_mountfs: invalid alt superblock daddr=0x%x\n",
dfs->dlfs_sboffs[1]);
error = EINVAL;
goto out;
}
/* Allocate the mount structure, copy the superblock into it. */
fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK);
memcpy(&fs->lfs_dlfs, tdfs, sizeof(struct dlfs));
#ifdef LFS_DO_ROLLFORWARD
/* Before rolling forward, lock so vget will sleep for other procs */
fs->lfs_flags = LFS_NOTYET;
fs->lfs_rfpid = p->p_pid;
#else
fs->lfs_flags = 0;
#endif
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;
abp->b_flags |= B_INVAL;
}
brelse(bp);
bp = NULL;
brelse(abp);
abp = NULL;
/* Set up the I/O information */
fs->lfs_iocount = 0;
fs->lfs_diropwait = 0;
fs->lfs_activesb = 0;
fs->lfs_uinodes = 0;
fs->lfs_ravail = 0;
#ifdef LFS_CANNOT_ROLLFW
fs->lfs_sbactive = 0;
#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_nadirop = 0;
fs->lfs_seglock = 0;
lockinit(&fs->lfs_freelock, PINOD, "lfs_freelock", 0, 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_stat.f_iosize = fs->lfs_bsize;
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;
ump->um_lognindir = ffs(fs->lfs_nindir) - 1;
for (i = 0; i < MAXQUOTAS; i++)
ump->um_quotas[i] = NULLVP;
devvp->v_specmountpoint = mp;
/*
* 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);
#ifdef LFS_DO_ROLLFORWARD
/*
* Roll forward.
*/
/*
* Phase I:
* Find the address of the last good partial segment that was written
* after the checkpoint. Mark the segments in question dirty, so
* they won't be reallocated.
*/
lastgoodpseg = oldoffset = offset = fs->lfs_offset;
flags = 0x0;
#ifdef DEBUG_LFS_RFW
printf("LFS roll forward phase 1: starting at offset 0x%x\n", offset);
#endif
LFS_SEGENTRY(sup, fs, datosn(fs, offset), bp);
if (!(sup->su_flags & SEGUSE_DIRTY))
--fs->lfs_nclean;
sup->su_flags |= SEGUSE_DIRTY;
(void) VOP_BWRITE(bp);
while ((offset = check_segsum(fs, offset, cred, CHECK_CKSUM, &flags,
p)) > 0) {
if(sntoda(fs, oldoffset) != sntoda(fs, offset)) {
LFS_SEGENTRY(sup, fs, datosn(fs, oldoffset), bp);
if (!(sup->su_flags & SEGUSE_DIRTY))
--fs->lfs_nclean;
sup->su_flags |= SEGUSE_DIRTY;
(void) VOP_BWRITE(bp);
}
#ifdef DEBUG_LFS_RFW
printf("LFS roll forward phase 1: offset=0x%x\n", offset);
if(flags & SS_DIROP) {
printf("lfs_mountfs: dirops at 0x%x\n", oldoffset);
if(!(flags & SS_CONT))
printf("lfs_mountfs: dirops end at 0x%x\n",
oldoffset);
}
#endif
if(!(flags & SS_CONT))
lastgoodpseg = offset;
oldoffset = offset;
}
#ifdef DEBUG_LFS_RFW
if (flags & SS_CONT) {
printf("LFS roll forward: warning: incomplete dirops discarded\n");
}
printf("LFS roll forward phase 1: completed: lastgoodpseg=0x%x\n",
lastgoodpseg);
#endif
/* Don't accidentally overwrite what we're trying to preserve */
offset = fs->lfs_offset;
fs->lfs_offset = lastgoodpseg;
fs->lfs_curseg = sntoda(fs, datosn(fs, fs->lfs_offset));
for (sn = curseg = datosn(fs, fs->lfs_curseg);;) {
sn = (sn + 1) % fs->lfs_nseg;
if (sn == curseg)
panic("lfs_mountfs: no clean segments");
LFS_SEGENTRY(sup, fs, sn, bp);
dirty = (sup->su_flags & SEGUSE_DIRTY);
brelse(bp);
if (!dirty)
break;
}
fs->lfs_nextseg = sntoda(fs, sn);
/*
* Phase II: Roll forward from the first superblock.
*/
while (offset != lastgoodpseg) {
#ifdef DEBUG_LFS_RFW
printf("LFS roll forward phase 2: 0x%x\n", offset);
#endif
oldoffset = offset;
offset = check_segsum(fs, offset, cred, CHECK_UPDATE, NULL, p);
}
/*
* Finish: flush our changes to disk.
*/
lfs_segwrite(fs->lfs_ivnode->v_mount, SEGM_CKP | SEGM_SYNC);
#ifdef DEBUG_LFS_RFW
printf("LFS roll forward complete\n");
#endif
/* Allow vget now that roll-forward is complete */
fs->lfs_flags &= ~(LFS_NOTYET);
wakeup(&fs->lfs_flags);
#endif /* LFS_DO_ROLLFORWARD */
/*
* Initialize the ifile cleaner info with information from
* the superblock.
*/
LFS_CLEANERINFO(cip, fs, bp);
cip->clean = fs->lfs_nclean;
cip->dirty = fs->lfs_nseg - fs->lfs_nclean;
cip->avail = fs->lfs_avail;
cip->bfree = fs->lfs_bfree;
(void) VOP_BWRITE(bp); /* Ifile */
/*
* 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); /* Ifile */
return (0);
out:
if (bp)
brelse(bp);
if (abp)
brelse(abp);
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p);
VOP_UNLOCK(devvp, 0);
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;
{
struct ufsmount *ump;
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;
if (ump->um_devvp->v_type != VBAD)
ump->um_devvp->v_specmountpoint = NULL;
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_CLOSE(ump->um_devvp,
ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
vput(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;
struct statfs *sbp;
struct proc *p;
{
struct lfs *fs;
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, LFS_EST_NONMETA(fs));
sbp->f_bfree = dbtofrags(fs, LFS_EST_BFREE(fs));
sbp->f_bavail = dbtofrags(fs, (long)LFS_EST_BFREE(fs) -
(long)LFS_EST_RSVD(fs));
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;
if (fs->lfs_ronly)
return 0;
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);
}
extern struct lock ufs_hashlock;
/*
* 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;
{
struct lfs *fs;
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;
fs = ump->um_lfs;
/*
* If the filesystem is not completely mounted yet, suspend
* any access requests (wait for roll-forward to complete).
*/
while((fs->lfs_flags & LFS_NOTYET) && curproc->p_pid != fs->lfs_rfpid)
tsleep(&fs->lfs_flags, PRIBIO+1, "lfs_notyet", 0);
if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL)
return (0);
if ((error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, &vp)) != 0) {
*vpp = NULL;
return (error);
}
do {
if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) {
ungetnewvnode(vp);
return (0);
}
} while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0));
/* Translate the inode number to a disk address. */
if (ino == LFS_IFILE_INUM)
daddr = fs->lfs_idaddr;
else {
/* XXX bounds-check this too */
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) {
*vpp = NULLVP;
ungetnewvnode(vp);
lockmgr(&ufs_hashlock, LK_RELEASE, 0);
return (ENOENT);
}
}
/* Allocate/init new vnode/inode. */
lfs_vcreate(mp, ino, vp);
/*
* 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);
lockmgr(&ufs_hashlock, LK_RELEASE, 0);
/*
* 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, bp);
ip->i_ffs_effnlink = ip->i_ffs_nlink;
ip->i_lfs_effnblks = ip->i_ffs_blocks;
#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);
}
#ifdef DIAGNOSTIC
if(vp->v_type == VNON) {
panic("lfs_vget: ino %d is type VNON! (ifmt %o)\n",
ip->i_number, (ip->i_ffs_mode & IFMT) >> 12);
}
#endif
/*
* Finish inode initialization now that aliasing has been resolved.
*/
ip->i_devvp = ump->um_devvp;
VREF(ip->i_devvp);
*vpp = vp;
uvm_vnp_setsize(vp, ip->i_ffs_size);
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)
struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
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;
{
struct inode *ip;
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 */
}
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