BSD 4_4 release

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

diff --git a/usr/src/sys/ufs/ufs/ufs_inode.c b/usr/src/sys/ufs/ufs/ufs_inode.c
index 4c2db27..e7e66f3 100644 (file)
--- a/usr/src/sys/ufs/ufs/ufs_inode.c
+++ b/usr/src/sys/ufs/ufs/ufs_inode.c
@@ -1,547 +1,184 @@
-/*     ufs_inode.c     4.26    82/10/17        */
-
-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/mount.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/inode.h"
-#include "../h/fs.h"
-#include "../h/conf.h"
-#include "../h/buf.h"
-#ifdef QUOTA
-#include "../h/quota.h"
-#endif
-#include "../h/kernel.h"
-
-#define        INOHSZ  63
-#if    ((INOHSZ&(INOHSZ-1)) == 0)
-#define        INOHASH(dev,ino)        (((dev)+(ino))&(INOHSZ-1))
-#else
-#define        INOHASH(dev,ino)        (((dev)+(ino))%INOHSZ)
-#endif
-
-union ihead {                          /* inode LRU cache, Chris Maltby */
-       union  ihead *ih_head[2];
-       struct inode *ih_chain[2];
-} ihead[INOHSZ];
-
-struct inode *ifreeh, **ifreet;
-

 /*
 /*

- * Initialize hash links for inodes
- * and build inode free list.
+ * Copyright (c) 1991, 1993
+ *     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.
+ *
+ *     @(#)ufs_inode.c 8.1 (Berkeley) 6/11/93

  */
  */

-ihinit()
-{
-       register int i;
-       register struct inode *ip = inode;
-       register union  ihead *ih = ihead;

 
 

-       for (i = INOHSZ; --i >= 0; ih++) {
-               ih->ih_head[0] = ih;
-               ih->ih_head[1] = ih;
-       }
-       ifreeh = ip;
-       ifreet = &ip->i_freef;
-       ip->i_freeb = &ifreeh;
-       ip->i_forw = ip;
-       ip->i_back = ip;
-       for (i = ninode; --i > 0; ) {
-               ++ip;
-               ip->i_forw = ip;
-               ip->i_back = ip;
-               *ifreet = ip;
-               ip->i_freeb = ifreet;
-               ifreet = &ip->i_freef;
-       }
-       ip->i_freef = NULL;
-}
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>

 
 

-#ifdef notdef
-/*
- * Find an inode if it is incore.
- * This is the equivalent, for inodes,
- * of ``incore'' in bio.c or ``pfind'' in subr.c.
- */
-struct inode *
-ifind(dev, ino)
-       dev_t dev;
-       ino_t ino;
-{
-       register struct inode *ip;
-       register union  ihead *ih;
+#include <ufs/ufs/quota.h>
+#include <ufs/ufs/inode.h>
+#include <ufs/ufs/ufsmount.h>
+#include <ufs/ufs/ufs_extern.h>

 
 

-       ih = &ihead[INOHASH(dev, ino)];
-       for (ip = ih->ih_chain[0]; ip != (struct inode *)ih; ip = ip->i_forw)
-               if (ino==ip->i_number && dev==ip->i_dev)
-                       return (ip);
-       return ((struct inode *)0);
-}
-#endif notdef
+u_long nextgennumber;          /* Next generation number to assign. */
+int    prtactive = 0;          /* 1 => print out reclaim of active vnodes */

 
 

-/*
- * Look up an inode by device,inumber.
- * If it is in core (in the inode structure),
- * honor the locking protocol.
- * If it is not in core, read it in from the
- * specified device.
- * If the inode is mounted on, perform
- * the indicated indirection.
- * In all cases, a pointer to a locked
- * inode structure is returned.
- *
- * panic: no imt -- if the mounted file
- *     system is not in the mount table.
- *     "cannot happen"
- */
-struct inode *
-iget(dev, fs, ino)
-       dev_t dev;
-       register struct fs *fs;
-       ino_t ino;
+int
+ufs_init()

 {
 {

-       register struct inode *ip;
-       register union  ihead *ih;
-       register struct mount *mp;
-       register struct buf *bp;
-       register struct dinode *dp;
-       register struct inode *iq;
+       static int first = 1;

 
 

-loop:
-       if (getfs(dev) != fs)
-               panic("iget: bad fs");
-       ih = &ihead[INOHASH(dev, ino)];
-       for (ip = ih->ih_chain[0]; ip != (struct inode *)ih; ip = ip->i_forw)
-               if (ino == ip->i_number && dev == ip->i_dev) {
-                       if ((ip->i_flag&ILOCKED) != 0) {
-                               ip->i_flag |= IWANT;
-                               sleep((caddr_t)ip, PINOD);
-                               goto loop;
-                       }
-                       if ((ip->i_flag&IMOUNT) != 0) {
-                               for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
-                                       if(mp->m_inodp == ip) {
-                                               dev = mp->m_dev;
-                                               fs = mp->m_bufp->b_un.b_fs;
-                                               ino = ROOTINO;
-                                               goto loop;
-                                       }
-                               panic("no imt");
-                       }
-                       if (ip->i_count == 0) {         /* ino on free list */
-                               if (iq = ip->i_freef)
-                                       iq->i_freeb = ip->i_freeb;
-                               else
-                                       ifreet = ip->i_freeb;
-                               *ip->i_freeb = iq;
-                               ip->i_freef = NULL;
-                               ip->i_freeb = NULL;
-                       }
-                       ip->i_count++;
-                       ip->i_flag |= ILOCKED;
-                       return(ip);
-               }
+       if (!first)
+               return (0);
+       first = 0;

 
 

-       if ((ip = ifreeh) == NULL) {
-               tablefull("inode");
-               u.u_error = ENFILE;
-               return(NULL);
-       }
-       if (iq = ip->i_freef)
-               iq->i_freeb = &ifreeh;
-       ifreeh = iq;
-       ip->i_freef = NULL;
-       ip->i_freeb = NULL;
-       /*
-        * Now to take inode off the hash chain it was on
-        * (initially, or after an iflush, it is on a "hash chain"
-        * consisting entirely of itself, and pointed to by no-one,
-        * but that doesn't matter), and put it on the chain for
-        * its new (ino, dev) pair
-        */
-       remque(ip);
-       insque(ip, ih);
-#ifdef QUOTA
-       dqrele(ip->i_dquot);
-#endif
-       ip->i_dev = dev;
-       ip->i_fs = fs;
-       ip->i_number = ino;
-       ip->i_flag = ILOCKED;
-       ip->i_count++;
-       ip->i_lastr = 0;
-       bp = bread(dev, fsbtodb(fs, itod(fs, ino)), fs->fs_bsize);
-       /*
-        * Check I/O errors
-        */
-       if ((bp->b_flags&B_ERROR) != 0) {
-               brelse(bp);
-               /*
-                * the inode doesn't contain anything useful, so it would
-                * be misleading to leave it on its hash chain.
-                * 'iput' will take care of putting it back on the free list.
-                */
-               remque(ip);
-               ip->i_forw = ip;
-               ip->i_back = ip;
-               /*
-                * we also loose its inumber, just in case (as iput
-                * doesn't do that any more) - but as it isn't on its
-                * hash chain, I doubt if this is really necessary .. kre
-                * (probably the two methods are interchangable)
-                */
-               ip->i_number = 0;
-#ifdef QUOTA
-               ip->i_dquot = NODQUOT;
-#endif
-               iput(ip);
-               return(NULL);
-       }
-       dp = bp->b_un.b_dino;
-       dp += itoo(fs, ino);
-       ip->i_ic = dp->di_ic;
-       brelse(bp);
-#ifdef QUOTA
-       if (ip->i_mode == 0)
-               ip->i_dquot = NODQUOT;
-       else
-               ip->i_dquot = inoquota(ip);
+#ifdef DIAGNOSTIC
+       if ((sizeof(struct inode) - 1) & sizeof(struct inode))
+               printf("ufs_init: bad size %d\n", sizeof(struct inode));

 #endif
 #endif

-       return (ip);
+       ufs_ihashinit();
+       dqinit();
+       return (0);

 }
 
 /*
 }
 
 /*

- * Decrement reference count of
- * an inode structure.
- * On the last reference,
- * write the inode out and if necessary,
+ * Last reference to an inode, write the inode out and if necessary,

  * truncate and deallocate the file.
  */
  * truncate and deallocate the file.
  */

-iput(ip)
-       register struct inode *ip;
-{
-
-       if ((ip->i_flag & ILOCKED) == 0)
-               panic("iput");
-       iunlock(ip);
-       irele(ip);
-}
-
-irele(ip)
-       register struct inode *ip;
+int
+ufs_inactive(ap)
+       struct vop_inactive_args /* {
+               struct vnode *a_vp;
+       } */ *ap;

 {
 {

-       int mode;
+       register struct vnode *vp = ap->a_vp;
+       register struct inode *ip = VTOI(vp);
+       struct timeval tv;
+       int mode, error;
+       extern int prtactive;
+
+       if (prtactive && vp->v_usecount != 0)
+               vprint("ffs_inactive: pushing active", vp);
+
+       /* Get rid of inodes related to stale file handles. */
+       if (ip->i_mode == 0) {
+               if ((vp->v_flag & VXLOCK) == 0)
+                       vgone(vp);
+               return (0);
+       }

 
 

-       if (ip->i_count == 1) {
-               ip->i_flag |= ILOCKED;
-               if (ip->i_nlink <= 0) {
-                       itrunc(ip, 0);
-                       mode = ip->i_mode;
-                       ip->i_mode = 0;
-                       ip->i_rdev = 0;
-                       ip->i_flag |= IUPD|ICHG;
-                       ifree(ip, ip->i_number, mode);
+       error = 0;
+#ifdef DIAGNOSTIC
+       if (VOP_ISLOCKED(vp))
+               panic("ffs_inactive: locked inode");
+       if (curproc)
+               ip->i_lockholder = curproc->p_pid;
+       else
+               ip->i_lockholder = -1;
+#endif
+       ip->i_flag |= ILOCKED;
+       if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {

 #ifdef QUOTA
 #ifdef QUOTA

-                       chkiq(ip->i_dev, ip, ip->i_uid, 0);
-                       dqrele(ip->i_dquot);
-                       ip->i_dquot = NODQUOT;
+               if (!getinoquota(ip))
+                       (void)chkiq(ip, -1, NOCRED, 0);

 #endif
 #endif

-               }
-               IUPDAT(ip, &time.tv_sec, &time.tv_sec, 0);
-               iunlock(ip);
-               ip->i_flag = 0;
-               /*
-                * Put the inode on the end of the free list.
-                * Possibly in some cases it would be better to
-                * put the inode at the head of the free list,
-                * (eg: where i_mode == 0 || i_number == 0)
-                * but I will think about that later .. kre
-                * (i_number is rarely 0 - only after an i/o error in iget,
-                * where i_mode == 0, the inode will probably be wanted
-                * again soon for an ialloc, so possibly we should keep it)
-                */
-               if (ifreeh) {
-                       *ifreet = ip;
-                       ip->i_freeb = ifreet;
-               } else {
-                       ifreeh = ip;
-                       ip->i_freeb = &ifreeh;
-               }
-               ip->i_freef = NULL;
-               ifreet = &ip->i_freef;
+               error = VOP_TRUNCATE(vp, (off_t)0, 0, NOCRED, NULL);
+               mode = ip->i_mode;
+               ip->i_mode = 0;
+               ip->i_rdev = 0;
+               ip->i_flag |= IUPD|ICHG;
+               VOP_VFREE(vp, ip->i_number, mode);

        }
        }

-       ip->i_count--;
-}
-
-/*
- * Check accessed and update flags on
- * an inode structure.
- * If any is on, update the inode
- * with the current time.
- * If waitfor is given, then must insure
- * i/o order so wait for write to complete.
- */
-iupdat(ip, ta, tm, waitfor)
-       register struct inode *ip;
-       time_t *ta, *tm;
-       int waitfor;
-{
-       register struct buf *bp;
-       struct dinode *dp;
-       register struct fs *fp;
-
-       fp = ip->i_fs;
-       if ((ip->i_flag & (IUPD|IACC|ICHG)) != 0) {
-               if (fp->fs_ronly)
-                       return;
-               bp = bread(ip->i_dev, fsbtodb(fp, itod(fp, ip->i_number)),
-                       fp->fs_bsize);
-               if (bp->b_flags & B_ERROR) {
-                       brelse(bp);
-                       return;
-               }
-               if (ip->i_flag&IACC)
-                       ip->i_atime = *ta;
-               if (ip->i_flag&IUPD)
-                       ip->i_mtime = *tm;
-               if (ip->i_flag&ICHG)
-                       ip->i_ctime = time.tv_sec;
-               ip->i_flag &= ~(IUPD|IACC|ICHG);
-               dp = bp->b_un.b_dino + itoo(fp, ip->i_number);
-               dp->di_ic = ip->i_ic;
-               if (waitfor)
-                       bwrite(bp);
-               else
-                       bdwrite(bp);
+       if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) {
+               tv = time;
+               VOP_UPDATE(vp, &tv, &tv, 0);

        }
        }

+       VOP_UNLOCK(vp);
+       /*
+        * If we are done with the inode, reclaim it
+        * so that it can be reused immediately.
+        */
+       if (vp->v_usecount == 0 && ip->i_mode == 0)
+               vgone(vp);
+       return (error);

 }
 
 /*
 }
 
 /*

- * Truncate the inode ip to at most
- * length size.  Free affected disk
- * blocks -- the blocks of the file
- * are removed in reverse order.
+ * Reclaim an inode so that it can be used for other purposes.

  */
  */

-itrunc(ip, length)
-       register struct inode *ip;
-       register int length;
+int
+ufs_reclaim(ap)
+       struct vop_reclaim_args /* {
+               struct vnode *a_vp;
+       } */ *ap;

 {
 {

-       register i;
-       dev_t dev;
-       daddr_t bn;
-       struct inode itmp;
-       register struct fs *fs;
-#ifdef QUOTA
-       register long cnt = 0;
-       long tloop();
-#endif
-       /*
-        * Only plain files, directories and symbolic
-        * links contain blocks.
-        */
-       i = ip->i_mode & IFMT;
-       if (i != IFREG && i != IFDIR && i != IFLNK)
-               return;
-       if (ip->i_size <= length)
-               return;
-
-       /*
-        * Clean inode on disk before freeing blocks
-        * to insure no duplicates if system crashes.
-        */
-       itmp = *ip;
-       itmp.i_size = length;
-       for (i = 0; i < NDADDR; i++)
-               itmp.i_db[i] = 0;
-       for (i = 0; i < NIADDR; i++)
-               itmp.i_ib[i] = 0;
-       itmp.i_flag |= ICHG|IUPD;
-       iupdat(&itmp, &time.tv_sec, &time.tv_sec, 1);
-       ip->i_flag &= ~(IUPD|IACC|ICHG);
+       register struct vnode *vp = ap->a_vp;
+       register struct inode *ip;
+       int i, type;

 
 

+       if (prtactive && vp->v_usecount != 0)
+               vprint("ufs_reclaim: pushing active", vp);

        /*
        /*

-        * Now return blocks to free list... if machine
-        * crashes, they will be harmless MISSING blocks.
-        */
-       fs = ip->i_fs;
-       /*
-        * release double indirect block first
-        */
-       bn = ip->i_ib[NIADDR-1];
-       if (bn != (daddr_t)0) {
-               ip->i_ib[NIADDR - 1] = (daddr_t)0;
-#ifdef QUOTA
-               cnt +=
-#endif
-                       tloop(ip, bn, 1);
-       }
-       /*
-        * release single indirect blocks second
+        * Remove the inode from its hash chain.

         */
         */

-       for (i = NIADDR - 2; i >= 0; i--) {
-               bn = ip->i_ib[i];
-               if (bn != (daddr_t)0) {
-                       ip->i_ib[i] = (daddr_t)0;
-#ifdef QUOTA
-                       cnt +=
-#endif
-                               tloop(ip, bn, 0);
-               }
-       }
+       ip = VTOI(vp);
+       ufs_ihashrem(ip);

        /*
        /*

-        * finally release direct blocks
+        * Purge old data structures associated with the inode.

         */
         */

-       for (i = NDADDR - 1; i>=0; i--) {
-               register size;
-
-               bn = ip->i_db[i];
-               if (bn == (daddr_t)0)
-                       continue;
-               ip->i_db[i] = (daddr_t)0;
-#ifndef QUOTA
-               fre(ip, bn, (off_t)blksize(fs, ip, i));
-#else
-               fre(ip, bn, size = (off_t)blksize(fs, ip, i));
-               cnt += size / DEV_BSIZE;
-#endif
+       cache_purge(vp);
+       if (ip->i_devvp) {
+               vrele(ip->i_devvp);
+               ip->i_devvp = 0;

        }
        }

-       ip->i_size = 0;
-       /*
-        * Inode was written and flags updated above.
-        * No need to modify flags here.
-        */
-#ifdef QUOTA
-       (void) chkdq(ip, -cnt, 0);
-#endif
-}
-
-#ifdef QUOTA
-long
-#endif
-tloop(ip, bn, indflg)
-       register struct inode *ip;
-       daddr_t bn;
-       int indflg;
-{
-       register i;
-       register struct buf *bp;
-       register daddr_t *bap;
-       register struct fs *fs;
-       daddr_t nb;
-#ifdef QUOTA
-       register long cnt = 0;
-#endif
-
-       bp = NULL;
-       fs = ip->i_fs;
-       for (i = NINDIR(fs) - 1; i >= 0; i--) {
-               if (bp == NULL) {
-                       bp = bread(ip->i_dev, fsbtodb(fs, bn), fs->fs_bsize);
-                       if (bp->b_flags & B_ERROR) {
-                               brelse(bp);
-                               return;
-                       }
-                       bap = bp->b_un.b_daddr;
-               }
-               nb = bap[i];
-               if (nb == (daddr_t)0)
-                       continue;
-               if (indflg) {
-#ifdef QUOTA
-                       cnt +=
-#endif
-                               tloop(ip, nb, 0);
-               } else {
-                       fre(ip, nb, fs->fs_bsize);

 #ifdef QUOTA
 #ifdef QUOTA

-                       cnt += fs->fs_bsize / DEV_BSIZE;
-#endif
+       for (i = 0; i < MAXQUOTAS; i++) {
+               if (ip->i_dquot[i] != NODQUOT) {
+                       dqrele(vp, ip->i_dquot[i]);
+                       ip->i_dquot[i] = NODQUOT;

                }
        }
                }
        }

-       if (bp != NULL)
-               brelse(bp);
-       fre(ip, bn, fs->fs_bsize);
-#ifdef QUOTA
-       cnt += fs->fs_bsize / DEV_BSIZE;
-       return(cnt);
-#endif
-}
-
-/*
- * remove any inodes in the inode cache belonging to dev
- *
- * There should not be any active ones, return error if any are found
- * (nb: this is a user error, not a system err)
- *
- * Also, count the references to dev by block devices - this really
- * has nothing to do with the object of the procedure, but as we have
- * to scan the inode table here anyway, we might as well get the
- * extra benefit.
- *
- * this is called from sumount()/sys3.c when dev is being unmounted
- */
-#ifdef QUOTA
-iflush(dev, iq)
-       dev_t dev;
-       struct inode *iq;
-#else
-iflush(dev)
-       dev_t dev;
-#endif
-{
-       register struct inode *ip;
-       register open = 0;
-
-       for (ip = inode; ip < inodeNINODE; ip++) {
-#ifdef QUOTA
-               if (ip != iq && ip->i_dev == dev)
-#else
-               if (ip->i_dev == dev)

 #endif
 #endif

-                       if (ip->i_count)
-                               return(-1);
-                       else {
-                               remque(ip);
-                               ip->i_forw = ip;
-                               ip->i_back = ip;
-                               /*
-                                * as i_count == 0, the inode was on the free
-                                * list already, just leave it there, it will
-                                * fall off the bottom eventually. We could
-                                * perhaps move it to the head of the free
-                                * list, but as umounts are done so
-                                * infrequently, we would gain very little,
-                                * while making the code bigger.
-                                */
-#ifdef QUOTA
-                               dqrele(ip->i_dquot);
-                               ip->i_dquot = NODQUOT;
-#endif
-                       }
-               else if (ip->i_count && (ip->i_mode&IFMT)==IFBLK &&
-                   ip->i_rdev == dev)
-                       open++;
+       switch (vp->v_mount->mnt_stat.f_type) {
+       case MOUNT_UFS:
+               type = M_FFSNODE;
+               break;
+       case MOUNT_MFS:
+               type = M_MFSNODE;
+               break;
+       case MOUNT_LFS:
+               type = M_LFSNODE;
+               break;
+       default:
+               panic("ufs_reclaim: not ufs file");

        }
        }

-       return (open);
-}
-
-/*
- * Lock an inode. If its already locked, set the WANT bit and sleep.
- */
-ilock(ip)
-       register struct inode *ip;
-{
-
-       ILOCK(ip);
-}
-
-/*
- * Unlock an inode.  If WANT bit is on, wakeup.
- */
-iunlock(ip)
-       register struct inode *ip;
-{
-
-       IUNLOCK(ip);
+       FREE(vp->v_data, type);
+       vp->v_data = NULL;
+       return (0);

 }
 }