usr/src/sys/ufs/ffs/ffs_vfsops.c

/*
 * Copyright (c) 1989, 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)ffs_vfsops.c        7.63 (Berkeley) %G%
 */

#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/specdev.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include "ioctl.h"
#include "disklabel.h"
#include "stat.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>

int ffs_sbupdate __P((struct ufsmount *, int));

struct vfsops ufs_vfsops = {
        ffs_mount,
        ufs_start,
        ffs_unmount,
        ffs_root,
        ufs_quotactl,
        ffs_statfs,
        ffs_sync,
        ffs_fhtovp,
        ffs_vptofh,
        ffs_init,
};

/*
 * Called by vfs_mountroot when ufs is going to be mounted as root.
 *
 * Name is updated by mount(8) after booting.
 */
#define ROOTNAME        "root_device"

ffs_mountroot()
{
        extern struct vnode *rootvp;
        register struct fs *fs;
        register struct mount *mp;
        struct proc *p = curproc;       /* XXX */
        struct ufsmount *ump;
        u_int size;
        int error;

        mp = malloc((u_long)sizeof(struct mount),
                M_MOUNT, M_WAITOK);
        mp->mnt_op = &ufs_vfsops;
        mp->mnt_flag = MNT_RDONLY;
        mp->mnt_mounth = NULLVP;
        if (error = ffs_mountfs(rootvp, mp, p)) {
                free(mp, M_MOUNT);
                return (error);
        }
        if (error = vfs_lock(mp)) {
                (void)ffs_unmount(mp, 0, p);
                free(mp, M_MOUNT);
                return (error);
        }
        rootfs = mp;
        mp->mnt_next = mp;
        mp->mnt_prev = mp;
        mp->mnt_vnodecovered = NULLVP;
        ump = VFSTOUFS(mp);
        fs = ump->um_fs;
        bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
        fs->fs_fsmnt[0] = '/';
        bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
            MNAMELEN);
        (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
            &size);
        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        (void)ffs_statfs(mp, &mp->mnt_stat, p);
        vfs_unlock(mp);
        inittodr(fs->fs_time);
        return (0);
}

/*
 * VFS Operations.
 *
 * mount system call
 */
int
ffs_mount(mp, path, data, ndp, p)
        register struct mount *mp;
        char *path;
        caddr_t data;
        struct nameidata *ndp;
        struct proc *p;
{
        struct vnode *devvp;
        struct ufs_args args;
        struct ufsmount *ump;
        register struct fs *fs;
        u_int size;
        int error;

        if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
                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;
                if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
                        fs->fs_ronly = 0;
                if (args.fspec == 0) {
                        /*
                         * Process export requests.
                         */
                        if (args.exflags & MNT_EXPORTED) {
                                if (error = hang_addrlist(mp, &args))
                                        return (error);
                                mp->mnt_flag |= MNT_EXPORTED;
                        }
                        if (args.exflags & MNT_DELEXPORT) {
                                free_addrlist(ump);
                                mp->mnt_flag &=
                                    ~(MNT_EXPORTED | MNT_DEFEXPORTED);
                        }
                        return (0);
                }
        }
        /*
         * Not an update, or updating the name: look up the name
         * and verify that it refers to a sensible block device.
         */
        NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
        if (error = namei(ndp))
                return (error);
        devvp = ndp->ni_vp;

        if (devvp->v_type != VBLK) {
                vrele(devvp);
                return (ENOTBLK);
        }
        if (major(devvp->v_rdev) >= nblkdev) {
                vrele(devvp);
                return (ENXIO);
        }
        if ((mp->mnt_flag & MNT_UPDATE) == 0)
                error = ffs_mountfs(devvp, mp, p);
        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_fs;
        (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
        bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
        bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)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);
        (void)ffs_statfs(mp, &mp->mnt_stat, p);
        return (0);
}

/*
 * Common code for mount and mountroot
 */
int
ffs_mountfs(devvp, mp, p)
        register struct vnode *devvp;
        struct mount *mp;
        struct proc *p;
{
        register struct ufsmount *ump = (struct ufsmount *)0;
        struct buf *bp = NULL;
        register struct fs *fs;
        dev_t dev = devvp->v_rdev;
        struct partinfo dpart;
        int havepart = 0, blks;
        caddr_t base, space;
        int havepart = 0, blks;
        int error, i, size;
        int needclose = 0;
        int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
        extern struct vnode *rootvp;

        if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p))
                return (error);
        needclose = 1;
        if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
                size = DEV_BSIZE;
        else {
                havepart = 1;
                size = dpart.disklab->d_secsize;
        }
        if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
                goto out;
        fs = bp->b_un.b_fs;
                error = EINVAL;         /* XXX needs translation */
                goto out;
        }
        ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
        bzero((caddr_t)ump, sizeof *ump);
        ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT,
            M_WAITOK);
        bcopy((caddr_t)bp->b_un.b_addr, (caddr_t)ump->um_fs,
           (u_int)fs->fs_sbsize);
        if (fs->fs_sbsize < SBSIZE)
                bp->b_flags |= B_INVAL;
        brelse(bp);
        bp = NULL;
        fs = ump->um_fs;
        fs->fs_ronly = ronly;
        if (ronly == 0)
                fs->fs_fmod = 1;
        if (havepart) {
                dpart.part->p_fstype = FS_BSDFFS;
                dpart.part->p_fsize = fs->fs_fsize;
                dpart.part->p_frag = fs->fs_frag;
                dpart.part->p_cpg = fs->fs_cpg;
        }
#ifdef SECSIZE
        /*
         * If we have a disk label, force per-partition
         * filesystem information to be correct
         * and set correct current fsbtodb shift.
         */
#endif SECSIZE
        if (havepart) {
                dpart.part->p_fstype = FS_BSDFFS;
                dpart.part->p_fsize = fs->fs_fsize;
                dpart.part->p_frag = fs->fs_frag;
#ifdef SECSIZE
#ifdef tahoe
                /*
                 * Save the original fsbtodb shift to restore on updates.
                 * (Console doesn't understand fsbtodb changes.)
                 */
                fs->fs_sparecon[0] = fs->fs_fsbtodb;
#endif
                i = fs->fs_fsize / size;
                for (fs->fs_fsbtodb = 0; i > 1; i >>= 1)
                        fs->fs_fsbtodb++;
#endif SECSIZE
                fs->fs_dbsize = size;
        }
        blks = howmany(fs->fs_cssize, fs->fs_fsize);
        base = space = malloc((u_long)fs->fs_cssize, 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;
#ifdef SECSIZE
                tp = bread(dev, fsbtodb(fs, fs->fs_csaddr + i), size,
                    fs->fs_dbsize);
#else SECSIZE
                error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
                        NOCRED, &bp);
                if (error) {
                        free(base, M_UFSMNT);
                        goto out;
                }
                bcopy((caddr_t)bp->b_un.b_addr, space, (u_int)size);
                fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space;
                space += size;
                brelse(bp);
                bp = NULL;
        }
        mp->mnt_data = (qaddr_t)ump;
        mp->mnt_stat.f_fsid.val[0] = (long)dev;
        mp->mnt_stat.f_fsid.val[1] = MOUNT_UFS;
        mp->mnt_flag |= MNT_LOCAL;
        ump->um_mountp = mp;
        ump->um_dev = dev;
        ump->um_devvp = devvp;
        for (i = 0; i < MAXQUOTAS; i++)
                ump->um_quotas[i] = NULLVP;
        devvp->v_specflags |= SI_MOUNTEDON;

        /* Sanity checks for old file systems.                     XXX */
        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 */

        return (0);
out:
        if (bp)
                brelse(bp);
        if (needclose)
                (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
        if (ump) {
                free(ump->um_fs, M_UFSMNT);
                free(ump, M_UFSMNT);
                mp->mnt_data = (qaddr_t)0;
        }
        return (error);
}

/*
 * unmount system call
 */
int
ffs_unmount(mp, mntflags, p)
        struct mount *mp;
        int mntflags;
        struct proc *p;
{
        extern int doforce;
        register struct ufsmount *ump;
        register struct fs *fs;
        int i, error, ronly, flags = 0;

        if (mntflags & MNT_FORCE) {
                if (!doforce || mp == rootfs)
                        return (EINVAL);
                flags |= FORCECLOSE;
        }
        mntflushbuf(mp, 0);
        if (mntinvalbuf(mp))
                return (EBUSY);
        ump = VFSTOUFS(mp);
                return (error);
#ifdef QUOTA
        if (mp->mnt_flag & MNT_QUOTA) {
                if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags))
                        return (error);
                for (i = 0; i < MAXQUOTAS; i++) {
                        if (ump->um_quotas[i] == NULLVP)
                                continue;
                        quotaoff(p, mp, i);
                }
                /*
                 * Here we fall through to vflush again to ensure
                 * that we have gotten rid of all the system vnodes.
                 */
        }
#endif
        if (error = vflush(mp, NULLVP, flags))
                return (error);
        fs = ump->um_fs;
        ronly = !fs->fs_ronly;
 * 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_type = MOUNT_UFS;
        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 = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) -
                (fs->fs_dsize - sbp->f_bfree);
        sbp->f_files =  fs->fs_ncg * fs->fs_ipg - ROOTINO;
        sbp->f_ffree = fs->fs_cstotal.cs_nifree;
        if (sbp != &mp->mnt_stat) {
                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)
        struct mount *mp;
        int waitfor;
{
        extern int syncprt;
        register struct vnode *vp;
        register struct inode *ip;
        register struct ufsmount *ump = VFSTOUFS(mp);
        register struct fs *fs;
        int error, allerror = 0;

        if (syncprt)
                ufs_bufstats();
        fs = ump->um_fs;
        /*
         * Write back modified superblock.
         * Consistency check that the superblock
         * is still in the buffer cache.
         */
        if (fs->fs_fmod != 0) {
                if (fs->fs_ronly != 0) {                /* XXX */
                        printf("fs = %s\n", fs->fs_fsmnt);
                        panic("update: rofs mod");
                }
                fs->fs_fmod = 0;
                fs->fs_time = time.tv_sec;
                allerror = ffs_sbupdate(ump, waitfor);
        }
        /*
         * Write back each (modified) inode.
         */
loop:
        for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) {
                /*
                 * 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;
                if (VOP_ISLOCKED(vp))
                        continue;
                ip = VTOI(vp);
                if ((ip->i_flag & (IMOD|IACC|IUPD|ICHG)) == 0 &&
                    vp->v_dirtyblkhd == NULL)
                        continue;
                if (vget(vp))
                        goto loop;
                if (vp->v_dirtyblkhd)
                        vflushbuf(vp, 0);
                if ((ip->i_flag & (IMOD|IACC|IUPD|ICHG)) &&
                    (error = ffs_update(vp, &time, &time, 0)))
                        allerror = error;
                vput(vp);
        }
        /*
         * Force stale file system control information to be flushed.
         */
        vflushbuf(ump->um_devvp, waitfor == MNT_WAIT ? B_SYNC : 0);
#ifdef QUOTA
        qsync(mp);
#endif
        return (allerror);
}

/*
 * 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 generation number matches unless setgen true
 */
int
ffs_fhtovp(mp, fhp, setgen, vpp)
        register struct mount *mp;
        struct fid *fhp;
        int setgen;
        struct vnode **vpp;
{
        register struct inode *ip;
        register struct ufid *ufhp;
        struct fs *fs;
        struct vnode *nvp;
        int error;

        ufhp = (struct ufid *)fhp;
        fs = VFSTOUFS(mp)->um_fs;
        if (ufhp->ufid_ino < ROOTINO ||
            ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg)
                return (EINVAL);
        if (error = ffs_vget(mp, ufhp->ufid_ino, &nvp)) {
                *vpp = NULLVP;
                return (error);
        }
        ip = VTOI(nvp);
        if (ip->i_mode == 0) {
                ufs_iput(ip);
                *vpp = NULLVP;
                return (EINVAL);
        }
        if (ip->i_gen != ufhp->ufid_gen) {
                if (setgen)
                        ufhp->ufid_gen = ip->i_gen;
                else {
                        ufs_iput(ip);
                        *vpp = NULLVP;
                        return (EINVAL);
                }
        }
        *vpp = nvp;
        return (0);
}

/*
 * Vnode pointer to File handle
 */
/* ARGSUSED */
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);
}

/*
 * Write a superblock and associated information back to disk.
 */
int
ffs_sbupdate(mp, waitfor)
        struct ufsmount *mp;
        int waitfor;
{
        register struct fs *fs = mp->um_fs;
        register struct buf *bp;
        int blks;
        caddr_t space;
        int i, size, error = 0;

#ifdef SECSIZE
        bp = getblk(mp->m_dev, (daddr_t)fsbtodb(fs, SBOFF / fs->fs_fsize),
            (int)fs->fs_sbsize, fs->fs_dbsize);
#else SECSIZE
        bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize);
#endif SECSIZE
        bcopy((caddr_t)fs, bp->b_un.b_addr, (u_int)fs->fs_sbsize);
        /* Restore compatibility to old file systems.              XXX */
        if (fs->fs_postblformat == FS_42POSTBLFMT)              /* XXX */
                bp->b_un.b_fs->fs_nrpos = -1;                   /* XXX */
#ifdef SECSIZE
#ifdef tahoe
        /* restore standard fsbtodb shift */
        bp->b_un.b_fs->fs_fsbtodb = fs->fs_sparecon[0];
        bp->b_un.b_fs->fs_sparecon[0] = 0;
#endif
#endif SECSIZE
        if (waitfor == MNT_WAIT)
                error = bwrite(bp);
        else
                bawrite(bp);
        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;
#ifdef SECSIZE
                bp = getblk(mp->m_dev, fsbtodb(fs, fs->fs_csaddr + i), size,
                    fs->fs_dbsize);
#else SECSIZE
                bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), size);
#endif SECSIZE
                bcopy(space, bp->b_un.b_addr, (u_int)size);
                space += size;
                if (waitfor == MNT_WAIT)
                        error = bwrite(bp);
                else
                        bawrite(bp);
        }
        return (error);
}