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

2000 lines
54 KiB
C
Raw Blame History

/* $NetBSD: lfs_vfsops.c,v 1.95 2003/02/19 12:49:10 yamt Exp $ */
/*-
* Copyright (c) 1999, 2000, 2001, 2002, 2003 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
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lfs_vfsops.c,v 1.95 2003/02/19 12:49:10 yamt Exp $");
#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/kthread.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 <sys/conf.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 <uvm/uvm.h>
#include <uvm/uvm_stat.h>
#include <uvm/uvm_pager.h>
#include <uvm/uvm_pdaemon.h>
#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>
#ifdef LFS_UBC
#include <miscfs/genfs/genfs.h>
#include <miscfs/genfs/genfs_node.h>
static int lfs_gop_write(struct vnode *, struct vm_page **, int, int);
#endif
static int lfs_mountfs(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;
extern int lfs_subsys_pages;
extern int locked_queue_count;
extern long locked_queue_bytes;
extern struct simplelock lfs_subsys_lock;
int lfs_writer_daemon = 0;
int lfs_do_flush = 0;
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_reinit,
lfs_done,
lfs_sysctl,
lfs_mountroot,
ufs_check_export,
lfs_vnodeopv_descs,
};
struct genfs_ops lfs_genfsops = {
#ifdef LFS_UBC
lfs_gop_size,
ufs_gop_alloc,
lfs_gop_write,
#else
NULL,
NULL,
genfs_compat_gop_write,
#endif
};
struct pool lfs_inode_pool, lfs_inoext_pool;
/*
* The writer daemon. UVM keeps track of how many dirty pages we are holding
* in lfs_subsys_pages; the daemon flushes the filesystem when this value
* crosses the (user-defined) threshhold LFS_MAX_PAGES.
*/
static void
lfs_writerd(void *arg)
{
#ifdef LFS_PD
struct mount *mp, *nmp;
struct lfs *fs;
#endif
lfs_writer_daemon = curproc->p_pid;
for (;;) {
tsleep(&lfs_writer_daemon, PVM, "lfswriter", 0);
#ifdef LFS_PD
/*
* Look through the list of LFSs to see if any of them
* have requested pageouts.
*/
simple_lock(&mountlist_slock);
for (mp = mountlist.cqh_first; mp != (void *)&mountlist;
mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
nmp = mp->mnt_list.cqe_next;
continue;
}
if (strncmp(&mp->mnt_stat.f_fstypename[0], MOUNT_LFS,
MFSNAMELEN) == 0) {
fs = ((struct ufsmount *)mp->mnt_data)->ufsmount_u.lfs;
if (fs->lfs_pdflush ||
!TAILQ_EMPTY(&fs->lfs_pchainhd)) {
fs->lfs_pdflush = 0;
simple_unlock(&mountlist_slock);
lfs_flush_fs(fs, 0);
simple_lock(&mountlist_slock);
}
}
simple_lock(&mountlist_slock);
nmp = mp->mnt_list.cqe_next;
vfs_unbusy(mp);
}
simple_unlock(&mountlist_slock);
#endif /* LFS_PD */
/*
* If global state wants a flush, flush everything.
*/
while (lfs_do_flush || locked_queue_count > LFS_MAX_BUFS ||
locked_queue_bytes > LFS_MAX_BYTES ||
lfs_subsys_pages > LFS_MAX_PAGES) {
#ifdef DEBUG_LFS_FLUSH
if (lfs_do_flush)
printf("daemon: lfs_do_flush\n");
if (locked_queue_count > LFS_MAX_BUFS)
printf("daemon: lqc = %d, max %d\n",
locked_queue_count, LFS_MAX_BUFS);
if (locked_queue_bytes > LFS_MAX_BYTES)
printf("daemon: lqb = %ld, max %d\n",
locked_queue_bytes, LFS_MAX_BYTES);
if (lfs_subsys_pages > LFS_MAX_PAGES)
printf("daemon: lssp = %d, max %d\n",
lfs_subsys_pages, LFS_MAX_PAGES);
#endif /* DEBUG_LFS_FLUSH */
lfs_flush(NULL, SEGM_WRITERD);
lfs_do_flush = 0;
}
wakeup(&lfs_subsys_pages);
}
/* NOTREACHED */
}
/*
* 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", &pool_allocator_nointr);
pool_init(&lfs_inoext_pool, sizeof(struct lfs_inode_ext), 8, 0, 0,
"lfsinoextpl", &pool_allocator_nointr);
#ifdef DEBUG
memset(lfs_log, 0, sizeof(lfs_log));
#endif
simple_lock_init(&lfs_subsys_lock);
}
void
lfs_reinit()
{
ufs_reinit();
}
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(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;
if (mp->mnt_flag & MNT_GETARGS) {
ump = VFSTOUFS(mp);
if (ump == NULL)
return EIO;
args.fspec = NULL;
vfs_showexport(mp, &args.export, &ump->um_export);
return copyout(&args, data, sizeof(args));
}
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 (bdevsw_lookup(devvp->v_rdev) == NULL) {
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);
}
/*
* 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, 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) {
#ifdef DEBUG_LFS_RFW
printf("update_meta: ino %d: lfs_rf_valloc returned %d\n", ino,
error);
#endif
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 += btofsb(fs, 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) {
#ifdef DEBUG_LFS_RFW
printf("update_meta: ufs_bmaparray returned %d\n", error);
#endif
vput(vp);
return error;
}
switch (num) {
case 0:
ooff = ip->i_ffs_db[lbn];
if (ooff == UNWRITTEN)
ip->i_ffs_blocks += btofsb(fs, size);
/* XXX what about fragment extension? */
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 += btofsb(fs, 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 %lld",
(long long)ap->in_lbn);
/* XXX ondisk32 */
ooff = ((int32_t *)bp->b_data)[ap->in_off];
if (ooff == UNWRITTEN)
ip->i_ffs_blocks += btofsb(fs, size);
/* XXX ondisk32 */
((int32_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, dtosn(fs, dbtofsb(fs, odaddr)), bp);
#ifdef DIAGNOSTIC
if (sup->su_nbytes < size) {
panic("update_meta: negative bytes "
"(segment %" PRIu32 " short by %ld)\n",
dtosn(fs, dbtofsb(fs, odaddr)), (long)size - sup->su_nbytes);
sup->su_nbytes = size;
}
#endif
sup->su_nbytes -= size;
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, dbtofsb(fs, odaddr)), bp);
}
LFS_SEGENTRY(sup, fs, dtosn(fs, ndaddr), bp);
sup->su_nbytes += size;
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, ndaddr), bp);
/* Fix this so it can be released */
/* ip->i_lfs_effnblks = ip->i_ffs_blocks; */
#ifdef DEBUG_LFS_RFW
/* Now look again to make sure it worked */
ufs_bmaparray(vp, lbn, &odaddr, &a[0], &num, NULL );
if (dbtofsb(fs, odaddr) != ndaddr)
printf("update_meta: failed setting ino %d lbn %" PRId64
" to %" PRId64 "\n", ino, lbn, ndaddr);
#endif
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, fsbtodb(fs, offset), fs->lfs_ibsize, cred, &dbp);
if (error) {
#ifdef DEBUG_LFS_RFW
printf("update_inoblk: bread returned %d\n", error);
#endif
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) {
#ifdef DEBUG_LFS_RFW
printf("update_inoblk: lfs_rf_valloc returned %d\n", error);
#endif
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 = dbtofsb(fs, dbp->b_blkno);
error = LFS_BWRITE_LOG(ibp); /* Ifile */
/* And do segment accounting */
if (dtosn(fs, daddr) != dtosn(fs, dbtofsb(fs, dbp->b_blkno))) {
if (daddr > 0) {
LFS_SEGENTRY(sup, fs, dtosn(fs, daddr),
ibp);
sup->su_nbytes -= DINODE_SIZE;
LFS_WRITESEGENTRY(sup, fs,
dtosn(fs, daddr),
ibp);
}
LFS_SEGENTRY(sup, fs, dtosn(fs, dbtofsb(fs, dbp->b_blkno)),
ibp);
sup->su_nbytes += DINODE_SIZE;
LFS_WRITESEGENTRY(sup, fs,
dtosn(fs, dbtofsb(fs, dbp->b_blkno)),
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 oldoffset;
int32_t *iaddr; /* XXX ondisk32 */
FINFO *fip;
SEGUSE *sup;
size_t size;
u_int64_t serial;
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 (sntod(fs, dtosn(fs, offset)) == offset) {
LFS_SEGENTRY(sup, fs, dtosn(fs, offset), bp);
if (sup->su_flags & SEGUSE_SUPERBLOCK)
offset += btofsb(fs, LFS_SBPAD);
brelse(bp);
}
/* Read in the segment summary */
error = bread(devvp, offset, fs->lfs_sumsize, 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,
fs->lfs_sumsize -
sizeof(ssp->ss_sumsum))) {
#ifdef DEBUG_LFS_RFW
printf("Sumsum error at 0x%" PRIx64 "\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%" PRIx64 "\n", offset);
#endif
offset = -1;
goto err1;
}
if (ssp->ss_create < fs->lfs_tstamp) {
#ifdef DEBUG_LFS_RFW
printf("Old data at 0x%" PRIx64 "\n", offset);
#endif
offset = -1;
goto err1;
}
}
if (fs->lfs_version > 1) {
serial = ssp->ss_serial;
if (serial != fs->lfs_serial + 1) {
#ifdef DEBUG_LFS_RFW
printf("Unexpected serial number at 0x%" PRIx64
"\n", offset);
#endif
offset = -1;
goto err1;
}
if (ssp->ss_ident != fs->lfs_ident) {
#ifdef DEBUG_LFS_RFW
printf("Incorrect fsid (0x%x vs 0x%x) at 0x%"
PRIx64 "\n", ssp->ss_ident, fs->lfs_ident, offset);
#endif
offset = -1;
goto err1;
}
}
if (pseg_flags)
*pseg_flags = ssp->ss_flags;
oldoffset = offset;
offset += btofsb(fs, fs->lfs_sumsize);
ninos = howmany(ssp->ss_ninos, INOPB(fs));
/* XXX ondisk32 */
iaddr = (int32_t *)(bp->b_data + fs->lfs_sumsize - sizeof(int32_t));
if (flags & CHECK_CKSUM) {
/* Count blocks */
nblocks = 0;
fip = (FINFO *)(bp->b_data + SEGSUM_SIZE(fs));
for (i = 0; i < ssp->ss_nfinfo; ++i) {
nblocks += fip->fi_nblocks;
if (fip->fi_nblocks <= 0)
break;
/* XXX ondisk32 */
fip = (FINFO *)(((char *)fip) + FINFOSIZE +
(fip->fi_nblocks * sizeof(int32_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 + SEGSUM_SIZE(fs));
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, fsbtodb(fs, 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 += btofsb(fs, fs->lfs_ibsize);
--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, fsbtodb(fs, 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 += btofsb(fs, size);
}
/* XXX ondisk32 */
fip = (FINFO *)(((char *)fip) + FINFOSIZE
+ fip->fi_nblocks * sizeof(int32_t));
}
/* Checksum the array, compare */
if ((flags & CHECK_CKSUM) &&
ssp->ss_datasum != cksum(datap, nblocks * sizeof(u_long)))
{
#ifdef DEBUG_LFS_RFW
printf("Datasum error at 0x%" PRIx64 " (wanted %x got %x)\n",
offset, ssp->ss_datasum, cksum(datap, nblocks *
sizeof(u_long)));
#endif
offset = -1;
goto err2;
}
/* If we're at the end of the segment, move to the next */
if (dtosn(fs, offset + btofsb(fs, fs->lfs_sumsize + fs->lfs_bsize)) !=
dtosn(fs, offset)) {
if (dtosn(fs, offset) == dtosn(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%" PRIx64
" -> segment %d\n", offset, dtosn(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);
/* XXX should we update the serial number even for bad psegs? */
if ((flags & CHECK_UPDATE) && offset > 0 && fs->lfs_version > 1)
fs->lfs_serial = serial;
return offset;
}
/*
* Common code for mount and mountroot
* LFS specific
*/
int
lfs_mountfs(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, secsize, fsbsize;
struct ucred *cred;
CLEANERINFO *cip;
SEGUSE *sup;
int flags, dirty, do_rollforward;
daddr_t offset, oldoffset, lastgoodpseg, sb_addr;
int sn, curseg;
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)
secsize = DEV_BSIZE;
else
secsize = dpart.disklab->d_secsize;
/* Don't free random space on error. */
bp = NULL;
abp = NULL;
ump = NULL;
sb_addr = LFS_LABELPAD / secsize;
while (1) {
/* Read in the superblock. */
error = bread(devvp, sb_addr, 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)) {
#ifdef DEBUG_LFS
printf("lfs_mountfs: primary superblock sanity failed\n");
#endif
error = EINVAL; /* XXX needs translation */
goto out;
}
if (dfs->dlfs_inodefmt > LFS_MAXINODEFMT)
printf("lfs_mountfs: warning: unknown inode format %d\n",
dfs->dlfs_inodefmt);
if (dfs->dlfs_version == 1)
fsbsize = secsize;
else {
fsbsize = 1 << (dfs->dlfs_bshift - dfs->dlfs_blktodb +
dfs->dlfs_fsbtodb);
/*
* Could be, if the frag size is large enough, that we
* don't have the "real" primary superblock. If that's
* the case, get the real one, and try again.
*/
if (sb_addr != dfs->dlfs_sboffs[0] <<
dfs->dlfs_fsbtodb) {
/* #ifdef DEBUG_LFS */
printf("lfs_mountfs: sb daddr 0x%llx is not right, trying 0x%llx\n",
(long long)sb_addr, (long long)(dfs->dlfs_sboffs[0] <<
dfs->dlfs_fsbtodb));
/* #endif */
sb_addr = dfs->dlfs_sboffs[0] <<
dfs->dlfs_fsbtodb;
brelse(bp);
continue;
}
}
break;
}
/*
* 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 / fsbsize > LFS_SBPAD / fsbsize)
{
error = bread(devvp, dfs->dlfs_sboffs[1] * (fsbsize / secsize),
LFS_SBPAD, cred, &abp);
if (error)
goto out;
adfs = (struct dlfs *)abp->b_data;
if (dfs->dlfs_version == 1) {
/* 1s resolution comparison */
if (adfs->dlfs_tstamp < dfs->dlfs_tstamp)
tdfs = adfs;
else
tdfs = dfs;
} else {
/* monotonic infinite-resolution comparison */
if (adfs->dlfs_serial < dfs->dlfs_serial)
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)) {
#ifdef DEBUG_LFS
printf("lfs_mountfs: alt superblock sanity failed\n");
#endif
error = EINVAL; /* XXX needs translation */
goto out;
}
} else {
#ifdef DEBUG_LFS
printf("lfs_mountfs: invalid alt superblock daddr=0x%x\n",
dfs->dlfs_sboffs[1]);
#endif
error = EINVAL;
goto out;
}
/* Allocate the mount structure, copy the superblock into it. */
fs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK | M_ZERO);
memcpy(&fs->lfs_dlfs, tdfs, sizeof(struct dlfs));
/* Compatibility */
if (fs->lfs_version < 2) {
fs->lfs_sumsize = LFS_V1_SUMMARY_SIZE;
fs->lfs_ibsize = fs->lfs_bsize;
fs->lfs_start = fs->lfs_sboffs[0];
fs->lfs_tstamp = fs->lfs_otstamp;
fs->lfs_fsbtodb = 0;
}
/* Before rolling forward, lock so vget will sleep for other procs */
fs->lfs_flags = LFS_NOTYET;
fs->lfs_rfpid = p->p_pid;
ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO);
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_devbsize = secsize;
fs->lfs_iocount = 0;
fs->lfs_diropwait = 0;
fs->lfs_activesb = 0;
fs->lfs_uinodes = 0;
fs->lfs_ravail = 0;
fs->lfs_sbactive = 0;
/* 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;
fs->lfs_pdflush = 0;
lockinit(&fs->lfs_fraglock, PINOD, "lfs_fraglock", 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 = 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;
mp->mnt_fs_bshift = fs->lfs_bshift;
ump->um_flags = 0;
ump->um_mountp = mp;
ump->um_dev = dev;
ump->um_devvp = devvp;
ump->um_bptrtodb = fs->lfs_fsbtodb;
ump->um_seqinc = fragstofsb(fs, fs->lfs_frag);
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;
/* Set up reserved memory for pageout */
lfs_setup_resblks(fs);
/* Set up vdirop tailq */
TAILQ_INIT(&fs->lfs_dchainhd);
/* and paging tailq */
TAILQ_INIT(&fs->lfs_pchainhd);
#if 0 /* XXXDEBUG */
fs->lfs_lastwrit = dbtofsb(fs, fs->lfs_offset - 1);
#endif
/*
* 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) {
#ifdef DEBUG
printf("lfs_mountfs: ifile vget failed, error=%d\n", error);
#endif
goto out;
}
fs->lfs_ivnode = vp;
VREF(vp);
/* Set up segment usage flags for the autocleaner. */
fs->lfs_suflags = (u_int32_t **)malloc(2 * sizeof(u_int32_t *),
M_SEGMENT, M_WAITOK);
fs->lfs_suflags[0] = (u_int32_t *)malloc(fs->lfs_nseg * sizeof(u_int32_t),
M_SEGMENT, M_WAITOK);
fs->lfs_suflags[1] = (u_int32_t *)malloc(fs->lfs_nseg * sizeof(u_int32_t),
M_SEGMENT, M_WAITOK);
memset(fs->lfs_suflags[1], 0, fs->lfs_nseg * sizeof(u_int32_t));
for (i = 0; i < fs->lfs_nseg; i++) {
LFS_SEGENTRY(sup, fs, i, bp);
if (!ronly && sup->su_nbytes == 0 &&
!(sup->su_flags & SEGUSE_EMPTY)) {
sup->su_flags |= SEGUSE_EMPTY;
fs->lfs_suflags[0][i] = sup->su_flags;
LFS_WRITESEGENTRY(sup, fs, i, bp);
} else if (!ronly && !(sup->su_nbytes == 0) &&
(sup->su_flags & SEGUSE_EMPTY)) {
sup->su_flags &= ~SEGUSE_EMPTY;
fs->lfs_suflags[0][i] = sup->su_flags;
LFS_WRITESEGENTRY(sup, fs, i, bp);
} else {
fs->lfs_suflags[0][i] = sup->su_flags;
brelse(bp);
}
}
/*
* Roll forward.
*
* We don't automatically roll forward for v1 filesystems, because
* of the danger that the clock was turned back between the last
* checkpoint and crash. This would roll forward garbage.
*
* v2 filesystems don't have this problem because they use a
* monotonically increasing serial number instead of a timestamp.
*/
#ifdef LFS_DO_ROLLFORWARD
do_rollforward = !fs->lfs_ronly;
#else
do_rollforward = (fs->lfs_version > 1 && !fs->lfs_ronly &&
!(fs->lfs_pflags & LFS_PF_CLEAN));
#endif
if (do_rollforward) {
/*
* 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%"
PRIx64 "\n", offset);
#endif
LFS_SEGENTRY(sup, fs, dtosn(fs, offset), bp);
if (!(sup->su_flags & SEGUSE_DIRTY))
--fs->lfs_nclean;
sup->su_flags |= SEGUSE_DIRTY;
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, offset), bp);
while ((offset = check_segsum(fs, offset, cred, CHECK_CKSUM,
&flags, p)) > 0)
{
if (sntod(fs, oldoffset) != sntod(fs, offset)) {
LFS_SEGENTRY(sup, fs, dtosn(fs, oldoffset),
bp);
if (!(sup->su_flags & SEGUSE_DIRTY))
--fs->lfs_nclean;
sup->su_flags |= SEGUSE_DIRTY;
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, oldoffset),
bp);
}
#ifdef DEBUG_LFS_RFW
printf("LFS roll forward phase 1: offset=0x%"
PRIx64 "\n", offset);
if (flags & SS_DIROP) {
printf("lfs_mountfs: dirops at 0x%" PRIx64 "\n",
oldoffset);
if (!(flags & SS_CONT))
printf("lfs_mountfs: dirops end "
"at 0x%" PRIx64 "\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%" PRIx64 "\n", lastgoodpseg);
#endif
oldoffset = fs->lfs_offset;
if (fs->lfs_offset != lastgoodpseg) {
/* Don't overwrite what we're trying to preserve */
offset = fs->lfs_offset;
fs->lfs_offset = lastgoodpseg;
fs->lfs_curseg = sntod(fs, dtosn(fs, fs->lfs_offset));
for (sn = curseg = dtosn(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 = sntod(fs, sn);
/*
* Phase II: Roll forward from the first superblock.
*/
while (offset != lastgoodpseg) {
#ifdef DEBUG_LFS_RFW
printf("LFS roll forward phase 2: 0x%"
PRIx64 "\n", offset);
#endif
offset = check_segsum(fs, offset, cred,
CHECK_UPDATE, NULL, p);
}
/*
* Finish: flush our changes to disk.
*/
lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC);
printf("lfs_mountfs: roll forward recovered %lld blocks\n",
(long long)(lastgoodpseg - oldoffset));
}
#ifdef DEBUG_LFS_RFW
printf("LFS roll forward complete\n");
#endif
}
/* If writing, sb is not clean; record in case of immediate crash */
if (!fs->lfs_ronly) {
fs->lfs_pflags &= ~LFS_PF_CLEAN;
lfs_writesuper(fs, fs->lfs_sboffs[0]);
}
/* Allow vget now that roll-forward is complete */
fs->lfs_flags &= ~(LFS_NOTYET);
wakeup(&fs->lfs_flags);
/*
* 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) LFS_BWRITE_LOG(bp); /* Ifile */
/*
* Mark the current segment as ACTIVE, since we're going to
* be writing to it.
*/
LFS_SEGENTRY(sup, fs, dtosn(fs, fs->lfs_offset), bp);
sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE;
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, fs->lfs_offset), bp); /* Ifile */
/* Now that roll-forward is done, unlock the Ifile */
vput(vp);
/* Comment on ifile size if it is too large */
if (fs->lfs_ivnode->v_size / fs->lfs_bsize > LFS_MAX_BUFS) {
fs->lfs_flags |= LFS_WARNED;
printf("lfs_mountfs: please consider increasing NBUF to at least %lld\n",
(long long)(fs->lfs_ivnode->v_size / fs->lfs_bsize) * (nbuf / LFS_MAX_BUFS));
}
if (fs->lfs_ivnode->v_size > LFS_MAX_BYTES) {
fs->lfs_flags |= LFS_WARNED;
printf("lfs_mountfs: please consider increasing BUFPAGES to at least %lld\n",
(long long)fs->lfs_ivnode->v_size * bufpages / LFS_MAX_BYTES);
}
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 = NULL;
}
/* Start the pagedaemon-anticipating daemon */
if (lfs_writer_daemon == 0 &&
kthread_create1(lfs_writerd, NULL, NULL, "lfs_writer") != 0)
panic("fork lfs_writer");
return (error);
}
/*
* unmount system call
*/
int
lfs_unmount(struct mount *mp, int mntflags, struct proc *p)
{
struct ufsmount *ump;
struct lfs *fs;
int 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) {
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);
if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0)
return (error);
if (LIST_FIRST(&fs->lfs_ivnode->v_dirtyblkhd))
panic("lfs_unmount: still dirty blocks on ifile vnode");
/* Explicitly write the superblock, to update serial and pflags */
fs->lfs_pflags |= LFS_PF_CLEAN;
lfs_writesuper(fs, fs->lfs_sboffs[0]);
lfs_writesuper(fs, fs->lfs_sboffs[1]);
/* Comment on ifile size if it has become too large */
if (!(fs->lfs_flags & LFS_WARNED)) {
if (fs->lfs_ivnode->v_size / fs->lfs_bsize > LFS_MAX_BUFS)
printf("lfs_unmount: please consider increasing"
" NBUF to at least %lld\n",
(long long)(fs->lfs_ivnode->v_size /
fs->lfs_bsize) *
(long long)(nbuf / LFS_MAX_BUFS));
if (fs->lfs_ivnode->v_size > LFS_MAX_BYTES)
printf("lfs_unmount: please consider increasing"
" BUFPAGES to at least %lld\n",
(long long)fs->lfs_ivnode->v_size *
bufpages / LFS_MAX_BYTES);
}
/* Finish with the Ifile, now that we're done with it */
vrele(fs->lfs_ivnode);
vgone(fs->lfs_ivnode);
/* Wait for superblock writes to complete */
while (fs->lfs_iocount)
tsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs_umount", 0);
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);
/* wake up the cleaner so it can die */
wakeup(&fs->lfs_nextseg);
wakeup(&lfs_allclean_wakeup);
/* Free per-mount data structures */
free(fs->lfs_suflags[0], M_SEGMENT);
free(fs->lfs_suflags[1], M_SEGMENT);
free(fs->lfs_suflags, M_SEGMENT);
lfs_free_resblks(fs);
free(fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
/*
* Get file system statistics.
*/
int
lfs_statfs(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 = fsbtofrags(fs, LFS_EST_NONMETA(fs));
sbp->f_bfree = fsbtofrags(fs, LFS_EST_BFREE(fs));
sbp->f_bavail = fsbtofrags(fs, (long)LFS_EST_BFREE(fs) -
(long)LFS_EST_RSVD(fs));
sbp->f_files = fs->lfs_bfree / btofsb(fs, fs->lfs_ibsize) * 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(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_writer, 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(struct mount *mp, ino_t ino, struct vnode **vpp)
{
struct lfs *fs;
struct dinode *dip;
struct inode *ip;
struct buf *bp;
struct ifile *ifp;
struct vnode *vp;
struct ufsmount *ump;
daddr_t daddr;
dev_t dev;
int i, error, retries;
struct timespec ts;
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;
if (fs->lfs_version > 1) {
ts.tv_sec = ifp->if_atime_sec;
ts.tv_nsec = ifp->if_atime_nsec;
}
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. */
retries = 0;
again:
error = bread(ump->um_devvp, fsbtodb(fs, daddr),
(fs->lfs_version == 1 ? fs->lfs_bsize : fs->lfs_ibsize),
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);
}
dip = lfs_ifind(fs, ino, bp);
if (dip == NULL) {
/* Assume write has not completed yet; try again */
bp->b_flags |= B_INVAL;
brelse(bp);
++retries;
if (retries > LFS_IFIND_RETRIES) {
#ifdef DEBUG
/* If the seglock is held look at the bpp to see
what is there anyway */
if (fs->lfs_seglock > 0) {
struct buf **bpp;
struct dinode *dp;
int i;
for (bpp = fs->lfs_sp->bpp;
bpp != fs->lfs_sp->cbpp; ++bpp) {
if ((*bpp)->b_vp == fs->lfs_ivnode &&
bpp != fs->lfs_sp->bpp) {
/* Inode block */
printf("block 0x%" PRIx64 ": ",
(*bpp)->b_blkno);
dp = (struct dinode *)(*bpp)->b_data;
for (i = 0; i < INOPB(fs); i++)
if (dp[i].di_u.inumber)
printf("%d ", dp[i].di_u.inumber);
printf("\n");
}
}
}
#endif
panic("lfs_vget: dinode not found");
}
printf("lfs_vget: dinode %d not found, retrying...\n", ino);
(void)tsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs ifind", 1);
goto again;
}
ip->i_din.ffs_din = *dip;
ip->i_ffs_effnlink = ip->i_ffs_nlink;
ip->i_lfs_effnblks = ip->i_ffs_blocks;
ip->i_lfs_osize = ip->i_ffs_size;
if (fs->lfs_version > 1) {
ip->i_ffs_atime = ts.tv_sec;
ip->i_ffs_atimensec = ts.tv_nsec;
}
brelse(bp);
memset(ip->i_lfs_fragsize, 0, NDADDR * sizeof(*ip->i_lfs_fragsize));
for (i = 0; i < NDADDR; i++)
if (ip->i_ffs_db[i] != 0)
ip->i_lfs_fragsize[i] = blksize(fs, ip, i);
/*
* Initialize the vnode from the inode, check for aliases. In all
* cases re-init ip, the underlying vnode/inode may have changed.
*/
ufs_vinit(mp, lfs_specop_p, lfs_fifoop_p, &vp);
#ifdef DIAGNOSTIC
if (vp->v_type == VNON) {
panic("lfs_vget: ino %d is type VNON! (ifmt %o)",
ip->i_number, (ip->i_ffs_mode & IFMT) >> 12);
}
#endif
/*
* Finish inode initialization now that aliasing has been resolved.
*/
genfs_node_init(vp, &lfs_genfsops);
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(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(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(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;
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
#ifdef LFS_UBC
/*
* lfs_gop_write functions exactly like genfs_gop_write, except that
* (1) it requires the seglock to be held by its caller, and sp->fip
* to be properly initialized (it will return without re-initializing
* sp->fip, and without calling lfs_writeseg).
* (2) it uses the remaining space in the segment, rather than VOP_BMAP,
* to determine how large a block it can write at once (though it does
* still use VOP_BMAP to find holes in the file);
* (3) it calls lfs_gatherblock instead of VOP_STRATEGY on its blocks
* (leaving lfs_writeseg to deal with the cluster blocks, so we might
* now have clusters of clusters, ick.)
*/
static int
lfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags)
{
int i, s, error, run;
int fs_bshift, dev_bshift;
vaddr_t kva;
off_t eof, offset, startoffset;
size_t bytes, iobytes, skipbytes;
daddr_t lbn, blkno;
struct vm_page *pg;
struct buf *mbp, *bp;
struct vnode *devvp;
struct inode *ip = VTOI(vp);
struct lfs *fs = ip->i_lfs;
struct segment *sp = fs->lfs_sp;
UVMHIST_FUNC("lfs_gop_write"); UVMHIST_CALLED(ubchist);
/* The Ifile lives in the buffer cache */
if (vp == fs->lfs_ivnode)
return genfs_compat_gop_write(vp, pgs, npages, flags);
/*
* Sometimes things slip past the filters in lfs_putpages,
* and the pagedaemon tries to write pages---problem is
* that the pagedaemon never acquires the segment lock.
*
* Unbusy and unclean the pages, and put them on the ACTIVE
* queue under the hypothesis that they couldn't have got here
* unless they were modified *quite* recently.
*
* XXXUBC that last statement is an oversimplification of course.
*/
if (!(fs->lfs_seglock) || fs->lfs_lockpid != curproc->p_pid) {
simple_lock(&vp->v_interlock);
#ifdef DEBUG
printf("lfs_gop_write: seglock not held\n");
#endif
uvm_lock_pageq();
for (i = 0; i < npages; i++) {
if (pgs[i]->flags & PG_WANTED)
wakeup(pgs[i]);
if (pgs[i]->flags & PG_PAGEOUT)
uvmexp.paging--;
if (pgs[i]->flags & PG_DELWRI) {
uvm_pageunwire(pgs[i]);
}
pgs[i]->flags &= ~(PG_BUSY|PG_CLEAN|PG_WANTED|PG_DELWRI|PG_PAGEOUT|PG_RELEASED);
UVM_PAGE_OWN(pg, NULL);
}
uvm_page_unbusy(pgs, npages);
uvm_unlock_pageq();
simple_unlock(&vp->v_interlock);
return EAGAIN;
}
UVMHIST_LOG(ubchist, "vp %p pgs %p npages %d flags 0x%x",
vp, pgs, npages, flags);
GOP_SIZE(vp, vp->v_size, &eof, GOP_SIZE_WRITE);
if (vp->v_type == VREG) {
fs_bshift = vp->v_mount->mnt_fs_bshift;
dev_bshift = vp->v_mount->mnt_dev_bshift;
} else {
fs_bshift = DEV_BSHIFT;
dev_bshift = DEV_BSHIFT;
}
error = 0;
pg = pgs[0];
startoffset = pg->offset;
bytes = MIN(npages << PAGE_SHIFT, eof - startoffset);
skipbytes = 0;
KASSERT(bytes != 0);
/* Swap PG_DELWRI for PG_PAGEOUT */
for (i = 0; i < npages; i++)
if (pgs[i]->flags & PG_DELWRI) {
KASSERT(!(pgs[i]->flags & PG_PAGEOUT));
pgs[i]->flags &= ~PG_DELWRI;
pgs[i]->flags |= PG_PAGEOUT;
uvmexp.paging++;
uvm_lock_pageq();
uvm_pageunwire(pgs[i]);
uvm_unlock_pageq();
}
/*
* Check to make sure we're starting on a block boundary.
* We'll check later to make sure we always write entire
* blocks (or fragments).
*/
if (startoffset & fs->lfs_bmask)
printf("%" PRId64 " & %" PRId64 " = %" PRId64 "\n",
startoffset, fs->lfs_bmask,
startoffset & fs->lfs_bmask);
KASSERT((startoffset & fs->lfs_bmask) == 0);
if (bytes & fs->lfs_ffmask) {
printf("lfs_gop_write: asked to write %ld bytes\n", (long)bytes);
panic("lfs_gop_write: non-integer blocks");
}
kva = uvm_pagermapin(pgs, npages,
UVMPAGER_MAPIN_WRITE | UVMPAGER_MAPIN_WAITOK);
s = splbio();
simple_lock(&global_v_numoutput_slock);
vp->v_numoutput += 2; /* one for biodone, one for aiodone */
simple_unlock(&global_v_numoutput_slock);
mbp = pool_get(&bufpool, PR_WAITOK);
splx(s);
memset(mbp, 0, sizeof(*bp));
simple_lock_init(&mbp->b_interlock);
UVMHIST_LOG(ubchist, "vp %p mbp %p num now %d bytes 0x%x",
vp, mbp, vp->v_numoutput, bytes);
mbp->b_bufsize = npages << PAGE_SHIFT;
mbp->b_data = (void *)kva;
mbp->b_resid = mbp->b_bcount = bytes;
mbp->b_flags = B_BUSY|B_WRITE|B_AGE|B_CALL;
mbp->b_iodone = uvm_aio_biodone;
mbp->b_vp = vp;
LIST_INIT(&mbp->b_dep);
bp = NULL;
for (offset = startoffset;
bytes > 0;
offset += iobytes, bytes -= iobytes) {
lbn = offset >> fs_bshift;
error = VOP_BMAP(vp, lbn, &devvp, &blkno, &run);
if (error) {
UVMHIST_LOG(ubchist, "VOP_BMAP() -> %d", error,0,0,0);
skipbytes += bytes;
bytes = 0;
break;
}
iobytes = MIN((((off_t)lbn + 1 + run) << fs_bshift) - offset,
bytes);
if (blkno == (daddr_t)-1) {
skipbytes += iobytes;
continue;
}
/*
* Discover how much we can really pack into this buffer.
*/
#ifdef LFS_UBC_BIGBUFS
/* If no room in the current segment, finish it up */
if (sp->sum_bytes_left < sizeof(int32_t) ||
sp->seg_bytes_left < MIN(iobytes, (1 << fs->lfs_bshift))) {
int version;
lfs_updatemeta(sp);
version = sp->fip->fi_version;
(void) lfs_writeseg(fs, sp);
sp->fip->fi_version = version;
sp->fip->fi_ino = ip->i_number;
/* Add the current file to the segment summary. */
++((SEGSUM *)(sp->segsum))->ss_nfinfo;
sp->sum_bytes_left -= FINFOSIZE;
}
iobytes = MIN(iobytes, ((sp->seg_bytes_left >> fs_bshift) << fs_bshift));
#else
iobytes = MIN(iobytes, (1 << fs_bshift));
if (iobytes != blksize(fs, ip, lblkno(fs, offset))) {
printf("iobytes = %" PRId64 ", blk = %" PRId64 "\n",
(int64_t)iobytes,
(int64_t)blksize(fs, ip, lblkno(fs, offset)));
}
KASSERT(iobytes == blksize(fs, ip, lblkno(fs, offset)));
#endif
KASSERT(iobytes > 0);
/* if it's really one i/o, don't make a second buf */
if (offset == startoffset && iobytes == bytes) {
bp = mbp;
/* printf("bp is mbp\n"); */
/* correct overcount if there is no second buffer */
s = splbio();
simple_lock(&global_v_numoutput_slock);
--vp->v_numoutput;
simple_unlock(&global_v_numoutput_slock);
splx(s);
} else {
/* printf("bp is not mbp\n"); */
s = splbio();
bp = pool_get(&bufpool, PR_WAITOK);
UVMHIST_LOG(ubchist, "vp %p bp %p num now %d",
vp, bp, vp->v_numoutput, 0);
splx(s);
memset(bp, 0, sizeof(*bp));
simple_lock_init(&bp->b_interlock);
bp->b_data = (char *)kva +
(vaddr_t)(offset - pg->offset);
bp->b_resid = bp->b_bcount = iobytes;
bp->b_flags = B_BUSY|B_WRITE|B_CALL;
bp->b_iodone = uvm_aio_biodone1;
LIST_INIT(&bp->b_dep);
}
/* XXX This is silly ... is this necessary? */
bp->b_vp = NULL;
s = splbio();
bgetvp(vp, bp);
splx(s);
bp->b_lblkno = lblkno(fs, offset);
bp->b_private = mbp;
if (devvp->v_type == VBLK) {
bp->b_dev = devvp->v_rdev;
}
VOP_BWRITE(bp);
while(lfs_gatherblock(sp, bp, NULL))
;
}
if (skipbytes) {
UVMHIST_LOG(ubchist, "skipbytes %d", skipbytes, 0,0,0);
s = splbio();
if (error) {
mbp->b_flags |= B_ERROR;
mbp->b_error = error;
}
mbp->b_resid -= skipbytes;
if (mbp->b_resid == 0) {
biodone(mbp);
}
splx(s);
}
UVMHIST_LOG(ubchist, "returning 0", 0,0,0,0);
return (0);
}
#endif /* LFS_UBC */
Reference in New Issue View Git Blame Copy Permalink