extend the IFILE, minor cleanups

[unix-history] / usr / src / sys / ufs / lfs / lfs_alloc.c

/*
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)lfs_alloc.c 7.39 (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 <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(pvp, notused, cred, vpp)
       struct vnode *pvp, **vpp;
       int notused;
       struct ucred *cred;
{
       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 error;

#ifdef VERBOSE
       printf("lfs_valloc\n");
#endif
       /* Get the head of the freelist. */
       fs = VTOI(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);
printf("Extending ifile: blkno = %d\n", blkno);
               bp = getblk(vp, blkno, fs->lfs_bsize);
               if (!bp) {
                       uprintf("\n%s: no inodes left\n", fs->lfs_fsmnt);
                       log(LOG_ERR, "uid %d on %s: out of inodes\n",
                           cred->cr_uid, fs->lfs_fsmnt);
                       return (ENOSPC);
               }
               i = (blkno - fs->lfs_segtabsz - fs->lfs_cleansz) *
                   fs->lfs_ifpb;
printf("Extending ifile: first inum = %d\n", i);
               fs->lfs_free = i;
               max = i + fs->lfs_ifpb;
printf("Extending ifile: max inum = %d\n", max);
               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;

               ++ip->i_blocks;                 /* XXX This may not be right. */
               ip->i_size += fs->lfs_bsize;
printf("Extending ifile: blocks = %d size = %d\n", ip->i_blocks, ip->i_size);
               vnode_pager_setsize(vp, ip->i_size);
               vnode_pager_uncache(vp);
               LFS_UBWRITE(bp);
       }

       /* Create a vnode to associate with the inode. */
       if (error = lfs_vcreate(pvp->v_mount, new_ino, &vp))
               return (error);
       *vpp = vp;
       ip = VTOI(vp);
       VREF(ip->i_devvp);

       /* Zero out the direct and indirect block addresses. */
       bzero(ip->i_db, (NDADDR + NIADDR) * sizeof(daddr_t));

       /* 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);

       /* 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 struct vnodeops lfs_vnodeops;
       struct inode *ip;
       struct ufsmount *ump;
       int error, i;

#ifdef VERBOSE
       printf("lfs_vcreate: ino %d\n", ino);
#endif
       /* Create the vnode. */
       if (error = getnewvnode(VT_LFS, mp, &lfs_vnodeops, 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_flag = 0;
       ip->i_mode = 0;
       ip->i_diroff = 0;
       ip->i_lockf = 0;
       ip->i_dev = ump->um_dev;
       ip->i_number = ip->i_din.di_inum = ino;
       ip->i_lfs = ump->um_lfs;
       ip->i_devvp = ump->um_devvp;
#ifdef QUOTA
       for (i = 0; i < MAXQUOTAS; i++)
               ip->i_dquot[i] = NODQUOT;
#endif
       return (0);
}

/* Free an inode. */
/* ARGUSED */
void
lfs_vfree(vp, notused1, notused2)
       struct vnode *vp;
       ino_t notused1;
       int notused2;
{
       struct buf *bp;
       struct ifile *ifp;
       struct inode *ip;
       struct lfs *fs;
       ino_t ino;

       ip = VTOI(vp);
#ifdef VERBOSE
       printf("lfs_vfree: free %d\n", ip->i_number);
#endif
       /* Get the inode number and file system. */
       fs = ip->i_lfs;
       ino = ip->i_number;

       /*
        * 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);
       ifp->if_daddr = LFS_UNUSED_DADDR;
       ++ifp->if_version;
       ifp->if_nextfree = fs->lfs_free;
       fs->lfs_free = ino;
       LFS_UBWRITE(bp);

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