usr/src/sys/ufs/lfs/lfs_alloc.c

/*
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)lfs_alloc.c 8.1 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/syslog.h>
#include <sys/mount.h>
#include <sys/malloc.h>

#include <vm/vm.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>

#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>

extern u_long nextgennumber;

/* Allocate a new inode. */
/* ARGSUSED */
int
lfs_valloc(ap)
        struct vop_valloc_args /* {
                struct vnode *a_pvp;
                int a_mode;
                struct ucred *a_cred;
                struct vnode **a_vpp;
        } */ *ap;
{
        struct lfs *fs;
        struct buf *bp;
        struct ifile *ifp;
        struct inode *ip;
        struct vnode *vp;
        daddr_t blkno;
        ino_t new_ino;
        u_long i, max;
        int bb, error;

        /* Get the head of the freelist. */
        fs = VTOI(ap->a_pvp)->i_lfs;
        new_ino = fs->lfs_free;
#ifdef ALLOCPRINT
        printf("lfs_ialloc: allocate inode %d\n", new_ino);
#endif

        /*
         * Remove the inode from the free list and write the new start
         * of the free list into the superblock.
         */
        LFS_IENTRY(ifp, fs, new_ino, bp);
        if (ifp->if_daddr != LFS_UNUSED_DADDR)
                panic("lfs_ialloc: inuse inode on the free list");
        fs->lfs_free = ifp->if_nextfree;
        brelse(bp);

        /* Extend IFILE so that the next lfs_valloc will succeed. */
        if (fs->lfs_free == LFS_UNUSED_INUM) {
                vp = fs->lfs_ivnode;
                ip = VTOI(vp);
                blkno = lblkno(fs, ip->i_size);
                lfs_balloc(vp, fs->lfs_bsize, blkno, &bp);
                ip->i_size += fs->lfs_bsize;
                vnode_pager_setsize(vp, (u_long)ip->i_size);
                vnode_pager_uncache(vp);

                i = (blkno - fs->lfs_segtabsz - fs->lfs_cleansz) *
                    fs->lfs_ifpb;
                fs->lfs_free = i;
                max = i + fs->lfs_ifpb;
                for (ifp = (struct ifile *)bp->b_un.b_words; i < max; ++ifp) {
                        ifp->if_version = 1;
                        ifp->if_daddr = LFS_UNUSED_DADDR;
                        ifp->if_nextfree = ++i;
                }
                ifp--;
                ifp->if_nextfree = LFS_UNUSED_INUM;
                if (error = VOP_BWRITE(bp))
                        return (error);
        }

        /* Create a vnode to associate with the inode. */
        if (error = lfs_vcreate(ap->a_pvp->v_mount, new_ino, &vp))
                return (error);


        ip = VTOI(vp);
        /* Zero out the direct and indirect block addresses. */
        bzero(&ip->i_din, sizeof(struct dinode));
        ip->i_din.di_inumber = new_ino;

        /* Set a new generation number for this inode. */
        if (++nextgennumber < (u_long)time.tv_sec)
                nextgennumber = time.tv_sec;
        ip->i_gen = nextgennumber;

        /* Insert into the inode hash table. */
        ufs_ihashins(ip);

        if (error = ufs_vinit(vp->v_mount, lfs_specop_p, LFS_FIFOOPS, &vp)) {
                vput(vp);
                *ap->a_vpp = NULL;
                return (error);
        }

        *ap->a_vpp = vp;
        vp->v_flag |= VDIROP;
        VREF(ip->i_devvp);

        /* Set superblock modified bit and increment file count. */
        fs->lfs_fmod = 1;
        ++fs->lfs_nfiles;
        return (0);
}

/* Create a new vnode/inode pair and initialize what fields we can. */
int
lfs_vcreate(mp, ino, vpp)
        struct mount *mp;
        ino_t ino;
        struct vnode **vpp;
{
        extern int (**lfs_vnodeop_p)();
        struct inode *ip;
        struct ufsmount *ump;
        int error, i;

        /* Create the vnode. */
        if (error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, vpp)) {
                *vpp = NULL;
                return (error);
        }

        /* Get a pointer to the private mount structure. */
        ump = VFSTOUFS(mp);

        /* Initialize the inode. */
        MALLOC(ip, struct inode *, sizeof(struct inode), M_LFSNODE, M_WAITOK);
        (*vpp)->v_data = ip;
        ip->i_vnode = *vpp;
        ip->i_devvp = ump->um_devvp;
        ip->i_flag = IMOD;
        ip->i_dev = ump->um_dev;
        ip->i_number = ip->i_din.di_inumber = ino;
ip->i_din.di_spare[0] = 0xdeadbeef;
ip->i_din.di_spare[1] = 0xdeadbeef;
        ip->i_lfs = ump->um_lfs;
#ifdef QUOTA
        for (i = 0; i < MAXQUOTAS; i++)
                ip->i_dquot[i] = NODQUOT;
#endif
        ip->i_lockf = 0;
        ip->i_diroff = 0;
        ip->i_mode = 0;
        ip->i_size = 0;
        ip->i_blocks = 0;
        ++ump->um_lfs->lfs_uinodes;
        return (0);
}

/* Free an inode. */
/* ARGUSED */
int
lfs_vfree(ap)
        struct vop_vfree_args /* {
                struct vnode *a_pvp;
                ino_t a_ino;
                int a_mode;
        } */ *ap;
{
        SEGUSE *sup;
        struct buf *bp;
        struct ifile *ifp;
        struct inode *ip;
        struct lfs *fs;
        daddr_t old_iaddr;
        ino_t ino;
        int error;

        /* Get the inode number and file system. */
        ip = VTOI(ap->a_pvp);
        fs = ip->i_lfs;
        ino = ip->i_number;
        if (ip->i_flag & IMOD) {
                --fs->lfs_uinodes;
                ip->i_flag &= ~(IMOD | IACC | IUPD | ICHG);
        }
        /*
         * Set the ifile's inode entry to unused, increment its version number
         * and link it into the free chain.
         */
        LFS_IENTRY(ifp, fs, ino, bp);
        old_iaddr = ifp->if_daddr;
        ifp->if_daddr = LFS_UNUSED_DADDR;
        ++ifp->if_version;
        ifp->if_nextfree = fs->lfs_free;
        fs->lfs_free = ino;
        (void) VOP_BWRITE(bp);

        if (old_iaddr != LFS_UNUSED_DADDR) {
                LFS_SEGENTRY(sup, fs, datosn(fs, old_iaddr), bp);
#ifdef DIAGNOSTIC
                if (sup->su_nbytes < sizeof(struct dinode))
                        panic("lfs_vfree: negative byte count (segment %d)\n",
                            datosn(fs, old_iaddr));
#endif
                sup->su_nbytes -= sizeof(struct dinode);
                (void) VOP_BWRITE(bp);
        }

        /* Set superblock modified bit and decrement file count. */
        fs->lfs_fmod = 1;
        --fs->lfs_nfiles;
        return (0);
}