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freebsd-skq/sys/ufs/ffs/ffs_vfsops.c
bp 6110b03d24 Add a lock structure to vnode structure. Previously it was either allocated 
separately (nfs, cd9660 etc) or keept as a first element of structure
referenced by v_data pointer(ffs). Such organization leads to known problems
with stacked filesystems.

From this point vop_no*lock*() functions maintain only interlock lock.
vop_std*lock*() functions maintain built-in v_lock structure using lockmgr().
vop_sharedlock() is compatible with vop_stdunlock(), but maintains a shared
lock on vnode.

If filesystem wishes to export lockmgr compatible lock, it can put an address
of this lock to v_vnlock field. This indicates that the upper filesystem
can take advantage of it and use single lock structure for entire (or part)
of stack of vnodes. This field shouldn't be examined or modified by VFS code
except for initialization purposes.

Reviewed in general by:	mckusick
2000-09-25 15:24:04 +00:00

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/*
* 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.
*
* @(#)ffs_vfsops.c 8.31 (Berkeley) 5/20/95
* $FreeBSD$
*/
#include "opt_ffs.h"
#include "opt_quota.h"
#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/bio.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/disklabel.h>
#include <sys/malloc.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
static MALLOC_DEFINE(M_FFSNODE, "FFS node", "FFS vnode private part");
static int ffs_sbupdate __P((struct ufsmount *, int));
static int ffs_reload __P((struct mount *,struct ucred *,struct proc *));
static int ffs_oldfscompat __P((struct fs *));
static int ffs_mount __P((struct mount *, char *, caddr_t,
struct nameidata *, struct proc *));
static int ffs_init __P((struct vfsconf *));
static struct vfsops ufs_vfsops = {
ffs_mount,
ufs_start,
ffs_unmount,
ufs_root,
ufs_quotactl,
ffs_statfs,
ffs_sync,
ffs_vget,
ffs_fhtovp,
ufs_check_export,
ffs_vptofh,
ffs_init,
vfs_stduninit,
#ifdef FFS_EXTATTR
ufs_extattrctl,
#else
vfs_stdextattrctl,
#endif
};
VFS_SET(ufs_vfsops, ufs, 0);
/*
* ffs_mount
*
* Called when mounting local physical media
*
* PARAMETERS:
* mountroot
* mp mount point structure
* path NULL (flag for root mount!!!)
* data <unused>
* ndp <unused>
* p process (user credentials check [statfs])
*
* mount
* mp mount point structure
* path path to mount point
* data pointer to argument struct in user space
* ndp mount point namei() return (used for
* credentials on reload), reused to look
* up block device.
* p process (user credentials check)
*
* RETURNS: 0 Success
* !0 error number (errno.h)
*
* LOCK STATE:
*
* ENTRY
* mount point is locked
* EXIT
* mount point is locked
*
* NOTES:
* A NULL path can be used for a flag since the mount
* system call will fail with EFAULT in copyinstr in
* namei() if it is a genuine NULL from the user.
*/
static int
ffs_mount(mp, path, data, ndp, p)
struct mount *mp; /* mount struct pointer*/
char *path; /* path to mount point*/
caddr_t data; /* arguments to FS specific mount*/
struct nameidata *ndp; /* mount point credentials*/
struct proc *p; /* process requesting mount*/
{
size_t size;
struct vnode *devvp;
struct ufs_args args;
struct ufsmount *ump = 0;
register struct fs *fs;
int error, flags;
mode_t accessmode;
/*
* Use NULL path to indicate we are mounting the root file system.
*/
if (path == NULL) {
if ((error = bdevvp(rootdev, &rootvp))) {
printf("ffs_mountroot: can't find rootvp\n");
return (error);
}
if ((error = ffs_mountfs(rootvp, mp, p, M_FFSNODE)) != 0)
return (error);
(void)VFS_STATFS(mp, &mp->mnt_stat, p);
return (0);
}
/*
* Mounting non-root file system or updating a file system
*/
if ((error = copyin(data, (caddr_t)&args, sizeof(struct ufs_args)))!= 0)
return (error);
/*
* 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_fs;
devvp = ump->um_devvp;
if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0)
return (error);
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
if (mp->mnt_flag & MNT_SOFTDEP) {
error = softdep_flushfiles(mp, flags, p);
} else {
error = ffs_flushfiles(mp, flags, p);
}
if (error) {
vn_finished_write(mp);
return (error);
}
fs->fs_ronly = 1;
if ((fs->fs_flags & FS_UNCLEAN) == 0)
fs->fs_clean = 1;
if ((error = ffs_sbupdate(ump, MNT_WAIT)) != 0) {
fs->fs_ronly = 0;
fs->fs_clean = 0;
vn_finished_write(mp);
return (error);
}
vn_finished_write(mp);
}
if ((mp->mnt_flag & MNT_RELOAD) &&
(error = ffs_reload(mp, ndp->ni_cnd.cn_cred, p)) != 0)
return (error);
if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_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(devvp, LK_EXCLUSIVE | LK_RETRY, p);
if ((error = VOP_ACCESS(devvp, VREAD | VWRITE,
p->p_ucred, p)) != 0) {
VOP_UNLOCK(devvp, 0, p);
return (error);
}
VOP_UNLOCK(devvp, 0, p);
}
fs->fs_flags &= ~FS_UNCLEAN;
if (fs->fs_clean == 0) {
fs->fs_flags |= FS_UNCLEAN;
if (mp->mnt_flag & MNT_FORCE) {
printf("WARNING: %s was not %s\n",
fs->fs_fsmnt, "properly dismounted");
} else {
printf(
"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
fs->fs_fsmnt);
return (EPERM);
}
}
if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0)
return (error);
fs->fs_ronly = 0;
fs->fs_clean = 0;
if ((error = ffs_sbupdate(ump, MNT_WAIT)) != 0) {
vn_finished_write(mp);
return (error);
}
/* check to see if we need to start softdep */
if ((fs->fs_flags & FS_DOSOFTDEP) &&
(error = softdep_mount(devvp, mp, fs, p->p_ucred))){
vn_finished_write(mp);
return (error);
}
if (fs->fs_snapinum[0] != 0)
ffs_snapshot_mount(mp);
vn_finished_write(mp);
}
/*
* Soft updates is incompatible with "async",
* so if we are doing softupdates stop the user
* from setting the async flag in an update.
* Softdep_mount() clears it in an initial mount
* or ro->rw remount.
*/
if (mp->mnt_flag & MNT_SOFTDEP)
mp->mnt_flag &= ~MNT_ASYNC;
/*
* If not updating name, process export requests.
*/
if (args.fspec == 0)
return (vfs_export(mp, &ump->um_export, &args.export));
/*
* If this is a snapshot request, take the snapshot.
*/
if (mp->mnt_flag & MNT_SNAPSHOT)
return (ffs_snapshot(mp, args.fspec));
}
/*
* 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);
NDFREE(ndp, NDF_ONLY_PNBUF);
devvp = ndp->ni_vp;
if (!vn_isdisk(devvp, &error)) {
vrele(devvp);
return (error);
}
/*
* 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, p);
if ((error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p))!= 0){
vput(devvp);
return (error);
}
VOP_UNLOCK(devvp, 0, p);
}
if (mp->mnt_flag & MNT_UPDATE) {
/*
* Update only
*
* If it's not the same vnode, or at least the same device
* then it's not correct.
*/
if (devvp != ump->um_devvp &&
devvp->v_rdev != ump->um_devvp->v_rdev)
error = EINVAL; /* needs translation */
vrele(devvp);
if (error)
return (error);
} else {
/*
* New mount
*
* We need the name for the mount point (also used for
* "last mounted on") copied in. If an error occurs,
* the mount point is discarded by the upper level code.
*/
copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
if ((error = ffs_mountfs(devvp, mp, p, M_FFSNODE)) != 0) {
vrele(devvp);
return (error);
}
}
/*
* Save "mounted from" device name info for mount point (NULL pad).
*/
copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
/*
* Initialize filesystem stat information in mount struct.
*/
(void)VFS_STATFS(mp, &mp->mnt_stat, p);
return (0);
}
/*
* Reload all incore data for a filesystem (used after running fsck on
* the root filesystem and finding things to fix). The filesystem must
* be mounted read-only.
*
* Things to do to update the mount:
* 1) invalidate all cached meta-data.
* 2) re-read superblock from disk.
* 3) re-read summary information from disk.
* 4) invalidate all inactive vnodes.
* 5) invalidate all cached file data.
* 6) re-read inode data for all active vnodes.
*/
static int
ffs_reload(mp, cred, p)
register struct mount *mp;
struct ucred *cred;
struct proc *p;
{
register struct vnode *vp, *nvp, *devvp;
struct inode *ip;
struct csum *space;
struct buf *bp;
struct fs *fs, *newfs;
struct partinfo dpart;
dev_t dev;
int i, blks, size, error;
int32_t *lp;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EINVAL);
/*
* Step 1: invalidate all cached meta-data.
*/
devvp = VFSTOUFS(mp)->um_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = vinvalbuf(devvp, 0, cred, p, 0, 0);
VOP_UNLOCK(devvp, 0, p);
if (error)
panic("ffs_reload: dirty1");
dev = devvp->v_rdev;
/*
* Only VMIO the backing device if the backing device is a real
* block device. See ffs_mountmfs() for more details.
*/
if (devvp->v_tag != VT_MFS && vn_isdisk(devvp, NULL)) {
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
vfs_object_create(devvp, p, p->p_ucred);
simple_lock(&devvp->v_interlock);
VOP_UNLOCK(devvp, LK_INTERLOCK, p);
}
/*
* Step 2: re-read superblock from disk.
*/
if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
size = DEV_BSIZE;
else
size = dpart.disklab->d_secsize;
if ((error = bread(devvp, (ufs_daddr_t)(SBOFF/size), SBSIZE, NOCRED,&bp)) != 0)
return (error);
newfs = (struct fs *)bp->b_data;
if (newfs->fs_magic != FS_MAGIC || newfs->fs_bsize > MAXBSIZE ||
newfs->fs_bsize < sizeof(struct fs)) {
brelse(bp);
return (EIO); /* XXX needs translation */
}
fs = VFSTOUFS(mp)->um_fs;
/*
* Copy pointer fields back into superblock before copying in XXX
* new superblock. These should really be in the ufsmount. XXX
* Note that important parameters (eg fs_ncg) are unchanged.
*/
bcopy(&fs->fs_csp[0], &newfs->fs_csp[0], sizeof(fs->fs_csp));
newfs->fs_maxcluster = fs->fs_maxcluster;
bcopy(newfs, fs, (u_int)fs->fs_sbsize);
if (fs->fs_sbsize < SBSIZE)
bp->b_flags |= B_INVAL | B_NOCACHE;
brelse(bp);
mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen;
ffs_oldfscompat(fs);
/*
* Step 3: re-read summary information from disk.
*/
blks = howmany(fs->fs_cssize, fs->fs_fsize);
space = fs->fs_csp[0];
for (i = 0; i < blks; i += fs->fs_frag) {
size = fs->fs_bsize;
if (i + fs->fs_frag > blks)
size = (blks - i) * fs->fs_fsize;
error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
NOCRED, &bp);
if (error)
return (error);
bcopy(bp->b_data, fs->fs_csp[fragstoblks(fs, i)], (u_int)size);
brelse(bp);
}
/*
* We no longer know anything about clusters per cylinder group.
*/
if (fs->fs_contigsumsize > 0) {
lp = fs->fs_maxcluster;
for (i = 0; i < fs->fs_ncg; i++)
*lp++ = fs->fs_contigsumsize;
}
loop:
simple_lock(&mntvnode_slock);
for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
if (vp->v_mount != mp) {
simple_unlock(&mntvnode_slock);
goto loop;
}
nvp = vp->v_mntvnodes.le_next;
/*
* Step 4: invalidate all inactive vnodes.
*/
if (vrecycle(vp, &mntvnode_slock, p))
goto loop;
/*
* Step 5: invalidate all cached file data.
*/
simple_lock(&vp->v_interlock);
simple_unlock(&mntvnode_slock);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) {
goto loop;
}
if (vinvalbuf(vp, 0, cred, p, 0, 0))
panic("ffs_reload: dirty2");
/*
* Step 6: re-read inode data for all active vnodes.
*/
ip = VTOI(vp);
error =
bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
(int)fs->fs_bsize, NOCRED, &bp);
if (error) {
vput(vp);
return (error);
}
ip->i_din = *((struct dinode *)bp->b_data +
ino_to_fsbo(fs, ip->i_number));
ip->i_effnlink = ip->i_nlink;
brelse(bp);
vput(vp);
simple_lock(&mntvnode_slock);
}
simple_unlock(&mntvnode_slock);
return (0);
}
/*
* Common code for mount and mountroot
*/
int
ffs_mountfs(devvp, mp, p, malloctype)
register struct vnode *devvp;
struct mount *mp;
struct proc *p;
struct malloc_type *malloctype;
{
register struct ufsmount *ump;
struct buf *bp;
register struct fs *fs;
dev_t dev;
struct partinfo dpart;
caddr_t base, space;
int error, i, blks, size, ronly;
int32_t *lp;
struct ucred *cred;
u_int64_t maxfilesize; /* XXX */
size_t strsize;
int ncount;
dev = devvp->v_rdev;
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.
*/
error = vfs_mountedon(devvp);
if (error)
return (error);
ncount = vcount(devvp);
if (ncount > 1 && devvp != rootvp)
return (EBUSY);
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0);
VOP_UNLOCK(devvp, 0, p);
if (error)
return (error);
/*
* Only VMIO the backing device if the backing device is a real
* block device. This excludes the original MFS implementation.
* Note that it is optional that the backing device be VMIOed. This
* increases the opportunity for metadata caching.
*/
if (devvp->v_tag != VT_MFS && vn_isdisk(devvp, NULL)) {
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
vfs_object_create(devvp, p, cred);
simple_lock(&devvp->v_interlock);
VOP_UNLOCK(devvp, LK_INTERLOCK, p);
}
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
VOP_UNLOCK(devvp, 0, p);
if (error)
return (error);
if (devvp->v_rdev->si_iosize_max > mp->mnt_iosize_max)
mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
if (mp->mnt_iosize_max > MAXPHYS)
mp->mnt_iosize_max = MAXPHYS;
if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0)
size = DEV_BSIZE;
else
size = dpart.disklab->d_secsize;
bp = NULL;
ump = NULL;
if ((error = bread(devvp, SBLOCK, SBSIZE, cred, &bp)) != 0)
goto out;
fs = (struct fs *)bp->b_data;
if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
fs->fs_bsize < sizeof(struct fs)) {
error = EINVAL; /* XXX needs translation */
goto out;
}
fs->fs_fmod = 0;
fs->fs_flags &= ~FS_UNCLEAN;
if (fs->fs_clean == 0) {
fs->fs_flags |= FS_UNCLEAN;
if (ronly || (mp->mnt_flag & MNT_FORCE)) {
printf(
"WARNING: %s was not properly dismounted\n",
fs->fs_fsmnt);
} else {
printf(
"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
fs->fs_fsmnt);
error = EPERM;
goto out;
}
}
/* XXX updating 4.2 FFS superblocks trashes rotational layout tables */
if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) {
error = EROFS; /* needs translation */
goto out;
}
ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
bzero((caddr_t)ump, sizeof *ump);
ump->um_malloctype = malloctype;
ump->um_i_effnlink_valid = 1;
ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT,
M_WAITOK);
ump->um_blkatoff = ffs_blkatoff;
ump->um_truncate = ffs_truncate;
ump->um_update = ffs_update;
ump->um_valloc = ffs_valloc;
ump->um_vfree = ffs_vfree;
bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize);
if (fs->fs_sbsize < SBSIZE)
bp->b_flags |= B_INVAL | B_NOCACHE;
brelse(bp);
bp = NULL;
fs = ump->um_fs;
fs->fs_ronly = ronly;
size = fs->fs_cssize;
blks = howmany(size, fs->fs_fsize);
if (fs->fs_contigsumsize > 0)
size += fs->fs_ncg * sizeof(int32_t);
base = space = malloc((u_long)size, M_UFSMNT, M_WAITOK);
for (i = 0; i < blks; i += fs->fs_frag) {
size = fs->fs_bsize;
if (i + fs->fs_frag > blks)
size = (blks - i) * fs->fs_fsize;
if ((error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
cred, &bp)) != 0) {
free(base, M_UFSMNT);
goto out;
}
bcopy(bp->b_data, space, (u_int)size);
fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space;
space += size;
brelse(bp);
bp = NULL;
}
if (fs->fs_contigsumsize > 0) {
fs->fs_maxcluster = lp = (int32_t *)space;
for (i = 0; i < fs->fs_ncg; i++)
*lp++ = fs->fs_contigsumsize;
}
mp->mnt_data = (qaddr_t)ump;
mp->mnt_stat.f_fsid.val[0] = fs->fs_id[0];
mp->mnt_stat.f_fsid.val[1] = fs->fs_id[1];
if (fs->fs_id[0] == 0 || fs->fs_id[1] == 0 ||
vfs_getvfs(&mp->mnt_stat.f_fsid))
vfs_getnewfsid(mp);
mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen;
mp->mnt_flag |= MNT_LOCAL;
ump->um_mountp = mp;
ump->um_dev = dev;
ump->um_devvp = devvp;
ump->um_nindir = fs->fs_nindir;
ump->um_bptrtodb = fs->fs_fsbtodb;
ump->um_seqinc = fs->fs_frag;
for (i = 0; i < MAXQUOTAS; i++)
ump->um_quotas[i] = NULLVP;
#ifdef FFS_EXTATTR
ufs_extattr_uepm_init(&ump->um_extattr);
#endif
devvp->v_specmountpoint = mp;
ffs_oldfscompat(fs);
/*
* Set FS local "last mounted on" information (NULL pad)
*/
copystr( mp->mnt_stat.f_mntonname, /* mount point*/
fs->fs_fsmnt, /* copy area*/
sizeof(fs->fs_fsmnt) - 1, /* max size*/
&strsize); /* real size*/
bzero( fs->fs_fsmnt + strsize, sizeof(fs->fs_fsmnt) - strsize);
if( mp->mnt_flag & MNT_ROOTFS) {
/*
* Root mount; update timestamp in mount structure.
* this will be used by the common root mount code
* to update the system clock.
*/
mp->mnt_time = fs->fs_time;
}
ump->um_savedmaxfilesize = fs->fs_maxfilesize; /* XXX */
maxfilesize = (u_int64_t)0x40000000 * fs->fs_bsize - 1; /* XXX */
if (fs->fs_maxfilesize > maxfilesize) /* XXX */
fs->fs_maxfilesize = maxfilesize; /* XXX */
if (ronly == 0) {
if ((fs->fs_flags & FS_DOSOFTDEP) &&
(error = softdep_mount(devvp, mp, fs, cred)) != 0) {
free(base, M_UFSMNT);
goto out;
}
if (fs->fs_snapinum[0] != 0)
ffs_snapshot_mount(mp);
fs->fs_fmod = 1;
fs->fs_clean = 0;
(void) ffs_sbupdate(ump, MNT_WAIT);
}
return (0);
out:
devvp->v_specmountpoint = NULL;
if (bp)
brelse(bp);
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p);
if (ump) {
free(ump->um_fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
}
return (error);
}
/*
* Sanity checks for old file systems.
*
* XXX - goes away some day.
*/
static int
ffs_oldfscompat(fs)
struct fs *fs;
{
fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */
fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */
if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
fs->fs_nrpos = 8; /* XXX */
if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
#if 0
int i; /* XXX */
u_int64_t sizepb = fs->fs_bsize; /* XXX */
/* XXX */
fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */
for (i = 0; i < NIADDR; i++) { /* XXX */
sizepb *= NINDIR(fs); /* XXX */
fs->fs_maxfilesize += sizepb; /* XXX */
} /* XXX */
#endif
fs->fs_maxfilesize = (u_quad_t) 1LL << 39;
fs->fs_qbmask = ~fs->fs_bmask; /* XXX */
fs->fs_qfmask = ~fs->fs_fmask; /* XXX */
} /* XXX */
return (0);
}
/*
* unmount system call
*/
int
ffs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
register struct ufsmount *ump;
register struct fs *fs;
int error, flags;
flags = 0;
if (mntflags & MNT_FORCE) {
flags |= FORCECLOSE;
}
#ifdef FFS_EXTATTR
if ((error = ufs_extattr_stop(mp, p)))
if (error != EOPNOTSUPP)
printf("ffs_unmount: ufs_extattr_stop returned %d\n",
error);
#endif
if (mp->mnt_flag & MNT_SOFTDEP) {
if ((error = softdep_flushfiles(mp, flags, p)) != 0)
return (error);
} else {
if ((error = ffs_flushfiles(mp, flags, p)) != 0)
return (error);
}
ump = VFSTOUFS(mp);
fs = ump->um_fs;
if (fs->fs_ronly == 0) {
fs->fs_clean = fs->fs_flags & FS_UNCLEAN ? 0 : 1;
error = ffs_sbupdate(ump, MNT_WAIT);
if (error) {
fs->fs_clean = 0;
return (error);
}
}
ump->um_devvp->v_specmountpoint = NULL;
vinvalbuf(ump->um_devvp, V_SAVE, NOCRED, p, 0, 0);
error = VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD|FWRITE,
NOCRED, p);
vrele(ump->um_devvp);
free(fs->fs_csp[0], M_UFSMNT);
free(fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
/*
* Flush out all the files in a filesystem.
*/
int
ffs_flushfiles(mp, flags, p)
register struct mount *mp;
int flags;
struct proc *p;
{
register struct ufsmount *ump;
int error;
ump = VFSTOUFS(mp);
#ifdef QUOTA
if (mp->mnt_flag & MNT_QUOTA) {
int i;
error = vflush(mp, NULLVP, 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 (ump->um_devvp->v_flag & VCOPYONWRITE) {
if ((error = vflush(mp, NULL, SKIPSYSTEM | flags)) != 0)
return (error);
ffs_snapshot_unmount(mp);
/*
* Here we fall through to vflush again to ensure
* that we have gotten rid of all the system vnodes.
*/
}
/*
* Flush all the files.
*/
if ((error = vflush(mp, NULL, flags)) != 0)
return (error);
/*
* Flush filesystem metadata.
*/
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_FSYNC(ump->um_devvp, p->p_ucred, MNT_WAIT, p);
VOP_UNLOCK(ump->um_devvp, 0, p);
return (error);
}
/*
* Get file system statistics.
*/
int
ffs_statfs(mp, sbp, p)
struct mount *mp;
register struct statfs *sbp;
struct proc *p;
{
register struct ufsmount *ump;
register struct fs *fs;
ump = VFSTOUFS(mp);
fs = ump->um_fs;
if (fs->fs_magic != FS_MAGIC)
panic("ffs_statfs");
sbp->f_bsize = fs->fs_fsize;
sbp->f_iosize = fs->fs_bsize;
sbp->f_blocks = fs->fs_dsize;
sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag +
fs->fs_cstotal.cs_nffree;
sbp->f_bavail = freespace(fs, fs->fs_minfree);
sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO;
sbp->f_ffree = fs->fs_cstotal.cs_nifree;
if (sbp != &mp->mnt_stat) {
sbp->f_type = mp->mnt_vfc->vfc_typenum;
bcopy((caddr_t)mp->mnt_stat.f_mntonname,
(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
}
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
ffs_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
struct vnode *nvp, *vp;
struct inode *ip;
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs;
int error, count, wait, lockreq, allerror = 0;
fs = ump->um_fs;
if (fs->fs_fmod != 0 && fs->fs_ronly != 0) { /* XXX */
printf("fs = %s\n", fs->fs_fsmnt);
panic("ffs_sync: rofs mod");
}
/*
* Write back each (modified) inode.
*/
wait = 0;
lockreq = LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK;
if (waitfor == MNT_WAIT) {
wait = 1;
lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
}
simple_lock(&mntvnode_slock);
loop:
for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
/*
* If the vnode that we are about to sync is no longer
* associated with this mount point, start over.
*/
if (vp->v_mount != mp)
goto loop;
simple_lock(&vp->v_interlock);
nvp = vp->v_mntvnodes.le_next;
ip = VTOI(vp);
if (vp->v_type == VNON || ((ip->i_flag &
(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
TAILQ_EMPTY(&vp->v_dirtyblkhd))) {
simple_unlock(&vp->v_interlock);
continue;
}
if (vp->v_type != VCHR) {
simple_unlock(&mntvnode_slock);
if ((error = vget(vp, lockreq, p)) != 0) {
simple_lock(&mntvnode_slock);
if (error == ENOENT)
goto loop;
continue;
}
if ((error = VOP_FSYNC(vp, cred, waitfor, p)) != 0)
allerror = error;
VOP_UNLOCK(vp, 0, p);
vrele(vp);
simple_lock(&mntvnode_slock);
} else {
simple_unlock(&mntvnode_slock);
simple_unlock(&vp->v_interlock);
UFS_UPDATE(vp, wait);
simple_lock(&mntvnode_slock);
}
}
simple_unlock(&mntvnode_slock);
/*
* Force stale file system control information to be flushed.
*/
if (waitfor == MNT_WAIT) {
if ((error = softdep_flushworklist(ump->um_mountp, &count, p)))
allerror = error;
/* Flushed work items may create new vnodes to clean */
if (count) {
simple_lock(&mntvnode_slock);
goto loop;
}
}
if (waitfor == MNT_NOWAIT) {
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, p);
if ((error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) != 0)
allerror = error;
VOP_UNLOCK(ump->um_devvp, 0, p);
}
#ifdef QUOTA
qsync(mp);
#endif
/*
* Write back modified superblock.
*/
if (fs->fs_fmod != 0 && (error = ffs_sbupdate(ump, waitfor)) != 0)
allerror = error;
return (allerror);
}
/*
* Look up a FFS dinode number to find its incore vnode, otherwise read it
* in from disk. If it is in core, wait for the lock bit to clear, then
* return the inode locked. Detection and handling of mount points must be
* done by the calling routine.
*/
static int ffs_inode_hash_lock;
int
ffs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
struct fs *fs;
struct inode *ip;
struct ufsmount *ump;
struct buf *bp;
struct vnode *vp;
dev_t dev;
int error;
ump = VFSTOUFS(mp);
dev = ump->um_dev;
restart:
if ((*vpp = ufs_ihashget(dev, ino)) != NULL) {
return (0);
}
/*
* Lock out the creation of new entries in the FFS hash table in
* case getnewvnode() or MALLOC() blocks, otherwise a duplicate
* may occur!
*/
if (ffs_inode_hash_lock) {
while (ffs_inode_hash_lock) {
ffs_inode_hash_lock = -1;
tsleep(&ffs_inode_hash_lock, PVM, "ffsvgt", 0);
}
goto restart;
}
ffs_inode_hash_lock = 1;
/*
* If this MALLOC() is performed after the getnewvnode()
* it might block, leaving a vnode with a NULL v_data to be
* found by ffs_sync() if a sync happens to fire right then,
* which will cause a panic because ffs_sync() blindly
* dereferences vp->v_data (as well it should).
*/
MALLOC(ip, struct inode *, sizeof(struct inode),
ump->um_malloctype, M_WAITOK);
/* Allocate a new vnode/inode. */
error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp);
if (error) {
if (ffs_inode_hash_lock < 0)
wakeup(&ffs_inode_hash_lock);
ffs_inode_hash_lock = 0;
*vpp = NULL;
FREE(ip, ump->um_malloctype);
return (error);
}
bzero((caddr_t)ip, sizeof(struct inode));
/*
* FFS supports lock sharing in the stack of vnodes
*/
vp->v_vnlock = &vp->v_lock;
lockinit(vp->v_vnlock, PINOD, "inode", 0, LK_CANRECURSE);
vp->v_data = ip;
ip->i_vnode = vp;
ip->i_fs = fs = ump->um_fs;
ip->i_dev = dev;
ip->i_number = ino;
#ifdef QUOTA
{
int i;
for (i = 0; i < MAXQUOTAS; i++)
ip->i_dquot[i] = NODQUOT;
}
#endif
/*
* 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.
*/
ufs_ihashins(ip);
if (ffs_inode_hash_lock < 0)
wakeup(&ffs_inode_hash_lock);
ffs_inode_hash_lock = 0;
/* Read in the disk contents for the inode, copy into the inode. */
error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
(int)fs->fs_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().
*/
brelse(bp);
vput(vp);
*vpp = NULL;
return (error);
}
ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino));
if (DOINGSOFTDEP(vp))
softdep_load_inodeblock(ip);
else
ip->i_effnlink = ip->i_nlink;
bqrelse(bp);
/*
* Initialize the vnode from the inode, check for aliases.
* Note that the underlying vnode may have changed.
*/
error = ufs_vinit(mp, ffs_specop_p, ffs_fifoop_p, &vp);
if (error) {
vput(vp);
*vpp = NULL;
return (error);
}
/*
* Finish inode initialization now that aliasing has been resolved.
*/
ip->i_devvp = ump->um_devvp;
VREF(ip->i_devvp);
/*
* Set up a generation number for this inode if it does not
* already have one. This should only happen on old filesystems.
*/
if (ip->i_gen == 0) {
ip->i_gen = random() / 2 + 1;
if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
ip->i_flag |= IN_MODIFIED;
}
/*
* Ensure that uid and gid are correct. This is a temporary
* fix until fsck has been changed to do the update.
*/
if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
ip->i_uid = ip->i_din.di_ouid; /* XXX */
ip->i_gid = ip->i_din.di_ogid; /* XXX */
} /* XXX */
*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 ffs_vget() to get the locked inode
* - check for an unallocated inode (i_mode == 0)
* - check that the given client host has export rights and return
* those rights via. exflagsp and credanonp
*/
int
ffs_fhtovp(mp, fhp, vpp)
register struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
register struct ufid *ufhp;
struct fs *fs;
ufhp = (struct ufid *)fhp;
fs = VFSTOUFS(mp)->um_fs;
if (ufhp->ufid_ino < ROOTINO ||
ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg)
return (ESTALE);
return (ufs_fhtovp(mp, ufhp, vpp));
}
/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
int
ffs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
register struct inode *ip;
register struct ufid *ufhp;
ip = VTOI(vp);
ufhp = (struct ufid *)fhp;
ufhp->ufid_len = sizeof(struct ufid);
ufhp->ufid_ino = ip->i_number;
ufhp->ufid_gen = ip->i_gen;
return (0);
}
/*
* Initialize the filesystem; just use ufs_init.
*/
static int
ffs_init(vfsp)
struct vfsconf *vfsp;
{
softdep_initialize();
return (ufs_init(vfsp));
}
/*
* Write a superblock and associated information back to disk.
*/
static int
ffs_sbupdate(mp, waitfor)
struct ufsmount *mp;
int waitfor;
{
register struct fs *dfs, *fs = mp->um_fs;
register struct buf *bp;
int blks;
caddr_t space;
int i, size, error, allerror = 0;
/*
* First write back the summary information.
*/
blks = howmany(fs->fs_cssize, fs->fs_fsize);
space = (caddr_t)fs->fs_csp[0];
for (i = 0; i < blks; i += fs->fs_frag) {
size = fs->fs_bsize;
if (i + fs->fs_frag > blks)
size = (blks - i) * fs->fs_fsize;
bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i),
size, 0, 0);
bcopy(space, bp->b_data, (u_int)size);
space += size;
if (waitfor != MNT_WAIT)
bawrite(bp);
else if ((error = bwrite(bp)) != 0)
allerror = error;
}
/*
* Now write back the superblock itself. If any errors occurred
* up to this point, then fail so that the superblock avoids
* being written out as clean.
*/
if (allerror)
return (allerror);
bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize, 0, 0);
fs->fs_fmod = 0;
fs->fs_time = time_second;
bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize);
/* Restore compatibility to old file systems. XXX */
dfs = (struct fs *)bp->b_data; /* XXX */
if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
dfs->fs_nrpos = -1; /* XXX */
if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
int32_t *lp, tmp; /* XXX */
/* XXX */
lp = (int32_t *)&dfs->fs_qbmask; /* XXX */
tmp = lp[4]; /* XXX */
for (i = 4; i > 0; i--) /* XXX */
lp[i] = lp[i-1]; /* XXX */
lp[0] = tmp; /* XXX */
} /* XXX */
dfs->fs_maxfilesize = mp->um_savedmaxfilesize; /* XXX */
if (waitfor != MNT_WAIT)
bawrite(bp);
else if ((error = bwrite(bp)) != 0)
allerror = error;
return (allerror);
}
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