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[unix-history] / usr / src / sys / ufs / ffs / ffs_inode.c
/*
* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
* @(#)ffs_inode.c 7.71 (Berkeley) %G%
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/trace.h>
#include <sys/resourcevar.h>
#include <vm/vm.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
static int ffs_indirtrunc __P((struct inode *, daddr_t, daddr_t, daddr_t, int,
long *));
int
ffs_init()
{
return (ufs_init());
}
/*
* Update the access, modified, and inode change times as specified
* by the IACC, IUPD, and ICHG flags respectively. The IMOD flag
* is used to specify that the inode needs to be updated but that
* the times have already been set. The access and modified times
* are taken from the second and third parameters; the inode change
* time is always taken from the current time. If waitfor is set,
* then wait for the disk write of the inode to complete.
*/
int
ffs_update(ap)
struct vop_update_args /* {
struct vnode *a_vp;
struct timeval *a_ta;
struct timeval *a_tm;
int a_waitfor;
} */ *ap;
{
struct buf *bp;
struct inode *ip;
struct dinode *dp;
register struct fs *fs;
ip = VTOI(ap->a_vp);
if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) {
ip->i_flag &= ~(IUPD|IACC|ICHG|IMOD);
return (0);
}
if ((ip->i_flag & (IUPD|IACC|ICHG|IMOD)) == 0)
return (0);
if (ip->i_flag&IACC)
ip->i_atime.ts_sec = ap->a_ta->tv_sec;
if (ip->i_flag&IUPD) {
ip->i_mtime.ts_sec = ap->a_tm->tv_sec;
ip->i_modrev++;
}
if (ip->i_flag&ICHG)
ip->i_ctime.ts_sec = time.tv_sec;
ip->i_flag &= ~(IUPD|IACC|ICHG|IMOD);
fs = ip->i_fs;
/*
* 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_din.di_ouid = ip->i_uid; /* XXX */
ip->i_din.di_ogid = ip->i_gid; /* XXX */
} /* XXX */
if (error = bread(ip->i_devvp, fsbtodb(fs, itod(fs, ip->i_number)),
(int)fs->fs_bsize, NOCRED, &bp)) {
brelse(bp);
return (error);
}
dp = bp->b_un.b_dino + itoo(fs, ip->i_number);
*dp = ip->i_din;
if (ap->a_waitfor)
return (bwrite(bp));
else {
bdwrite(bp);
return (0);
}
}
#define SINGLE 0 /* index of single indirect block */
#define DOUBLE 1 /* index of double indirect block */
#define TRIPLE 2 /* index of triple indirect block */
/*
* Truncate the inode oip to at most length size. Free affected disk
* blocks -- the blocks of the file are removed in reverse order.
*/
ffs_truncate(ap)
struct vop_truncate_args /* {
struct vnode *a_vp;
off_t a_length;
int a_flags;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vnode *ovp = ap->a_vp;
register daddr_t lastblock;
register struct inode *oip;
daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
daddr_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
off_t length = ap->a_length;
register struct fs *fs;
struct buf *bp;
int offset, size, level;
long count, nblocks, vflags, blocksreleased = 0;
struct timeval tv;
register int i;
int aflags, error, allerror;
off_t osize;
oip = VTOI(ovp);
tv = time;
if (ovp->v_type == VLNK &&
oip->i_size < ovp->v_mount->mnt_maxsymlinklen) {
#ifdef DIAGNOSTIC
if (length != 0)
panic("ffs_truncate: partial truncate of symlink");
#endif
bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
oip->i_size = 0;
oip->i_flag |= ICHG|IUPD;
return (VOP_UPDATE(ovp, &tv, &tv, 1));
}
if (oip->i_size == length) {
oip->i_flag |= ICHG|IUPD;
return (VOP_UPDATE(ovp, &tv, &tv, 0));
}
#ifdef QUOTA
if (error = getinoquota(oip))
return (error);
#endif
vnode_pager_setsize(ovp, (u_long)length);
fs = oip->i_fs;
osize = oip->i_size;
/*
* Lengthen the size of the file. We must ensure that the
* last byte of the file is allocated. Since the smallest
* value of oszie is 0, length will be at least 1.
*/
if (osize < length) {
offset = blkoff(fs, length - 1);
lbn = lblkno(fs, length - 1);
aflags = B_CLRBUF;
if (ap->a_flags & IO_SYNC)
aflags |= B_SYNC;
if (error = ffs_balloc(oip, lbn, offset + 1, ap->a_cred, &bp,
aflags))
return (error);
oip->i_size = length;
(void) vnode_pager_uncache(ovp);
if (aflags & IO_SYNC)
bwrite(bp);
else
bawrite(bp);
oip->i_flag |= ICHG|IUPD;
return (VOP_UPDATE(ovp, &tv, &tv, 1));
}
/*
* Shorten the size of the file. If the file is not being
* truncated to a block boundry, the contents of the
* partial block following the end of the file must be
* zero'ed in case it ever become accessable again because
* of subsequent file growth.
*/
offset = blkoff(fs, length);
if (offset == 0) {
oip->i_size = length;
} else {
lbn = lblkno(fs, length);
aflags = B_CLRBUF;
if (ap->a_flags & IO_SYNC)
aflags |= B_SYNC;
if (error = ffs_balloc(oip, lbn, offset, ap->a_cred, &bp,
aflags))
return (error);
oip->i_size = length;
size = blksize(fs, oip, lbn);
(void) vnode_pager_uncache(ovp);
bzero(bp->b_un.b_addr + offset, (u_int)(size - offset));
allocbuf(bp, size);
if (aflags & IO_SYNC)
bwrite(bp);
else
bawrite(bp);
}
/*
* Calculate index into inode's block list of
* last direct and indirect blocks (if any)
* which we want to keep. Lastblock is -1 when
* the file is truncated to 0.
*/
lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1;
lastiblock[SINGLE] = lastblock - NDADDR;
lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
nblocks = btodb(fs->fs_bsize);
/*
* Update file and block pointers on disk before we start freeing
* blocks. If we crash before free'ing blocks below, the blocks
* will be returned to the free list. lastiblock values are also
* normalized to -1 for calls to ffs_indirtrunc below.
*/
bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks);
for (level = TRIPLE; level >= SINGLE; level--)
if (lastiblock[level] < 0) {
oip->i_ib[level] = 0;
lastiblock[level] = -1;
}
for (i = NDADDR - 1; i > lastblock; i--)
oip->i_db[i] = 0;
oip->i_flag |= ICHG|IUPD;
if (error = VOP_UPDATE(ovp, &tv, &tv, MNT_WAIT))
allerror = error;
/*
* Having written the new inode to disk, save its new configuration
* and put back the old block pointers long enough to process them.
* Note that we save the new block configuration so we can check it
* when we are done.
*/
bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks);
bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks);
oip->i_size = osize;
vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA;
allerror = vinvalbuf(ovp, vflags, ap->a_cred, ap->a_p, 0, 0);
/*
* Indirect blocks first.
*/
indir_lbn[SINGLE] = -NDADDR;
indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
for (level = TRIPLE; level >= SINGLE; level--) {
bn = oip->i_ib[level];
if (bn != 0) {
error = ffs_indirtrunc(oip, indir_lbn[level],
fsbtodb(fs, bn), lastiblock[level], level, &count);
if (error)
allerror = error;
blocksreleased += count;
if (lastiblock[level] < 0) {
oip->i_ib[level] = 0;
ffs_blkfree(oip, bn, fs->fs_bsize);
blocksreleased += nblocks;
}
}
if (lastiblock[level] >= 0)
goto done;
}
/*
* All whole direct blocks or frags.
*/
for (i = NDADDR - 1; i > lastblock; i--) {
register long bsize;
bn = oip->i_db[i];
if (bn == 0)
continue;
oip->i_db[i] = 0;
bsize = blksize(fs, oip, i);
ffs_blkfree(oip, bn, bsize);
blocksreleased += btodb(bsize);
}
if (lastblock < 0)
goto done;
/*
* Finally, look for a change in size of the
* last direct block; release any frags.
*/
bn = oip->i_db[lastblock];
if (bn != 0) {
long oldspace, newspace;
/*
* Calculate amount of space we're giving
* back as old block size minus new block size.
*/
oldspace = blksize(fs, oip, lastblock);
oip->i_size = length;
newspace = blksize(fs, oip, lastblock);
if (newspace == 0)
panic("itrunc: newspace");
if (oldspace - newspace > 0) {
/*
* Block number of space to be free'd is
* the old block # plus the number of frags
* required for the storage we're keeping.
*/
bn += numfrags(fs, newspace);
ffs_blkfree(oip, bn, oldspace - newspace);
blocksreleased += btodb(oldspace - newspace);
}
}
done:
#ifdef DIAGNOSTIC
for (level = SINGLE; level <= TRIPLE; level++)
if (newblks[NDADDR + level] != oip->i_ib[level])
panic("itrunc1");
for (i = 0; i < NDADDR; i++)
if (newblks[i] != oip->i_db[i])
panic("itrunc2");
if (length == 0 &&
(ovp->v_dirtyblkhd.le_next || ovp->v_cleanblkhd.le_next))
panic("itrunc3");
#endif /* DIAGNOSTIC */
/*
* Put back the real size.
*/
oip->i_size = length;
oip->i_blocks -= blocksreleased;
if (oip->i_blocks < 0) /* sanity */
oip->i_blocks = 0;
oip->i_flag |= ICHG;
#ifdef QUOTA
(void) chkdq(oip, -blocksreleased, NOCRED, 0);
#endif
return (allerror);
}
/*
* Release blocks associated with the inode ip and stored in the indirect
* block bn. Blocks are free'd in LIFO order up to (but not including)
* lastbn. If level is greater than SINGLE, the block is an indirect block
* and recursive calls to indirtrunc must be used to cleanse other indirect
* blocks.
*
* NB: triple indirect blocks are untested.
*/
static int
ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
register struct inode *ip;
daddr_t lbn, lastbn;
daddr_t dbn;
int level;
long *countp;
{
register int i;
struct buf *bp;
register struct fs *fs = ip->i_fs;
register daddr_t *bap;
struct vnode *vp;
daddr_t *copy, nb, nlbn, last;
long blkcount, factor;
int nblocks, blocksreleased = 0;
int error = 0, allerror = 0;
/*
* Calculate index in current block of last
* block to be kept. -1 indicates the entire
* block so we need not calculate the index.
*/
factor = 1;
for (i = SINGLE; i < level; i++)
factor *= NINDIR(fs);
last = lastbn;
if (lastbn > 0)
last /= factor;
nblocks = btodb(fs->fs_bsize);
/*
* Get buffer of block pointers, zero those entries corresponding
* to blocks to be free'd, and update on disk copy first. Since
* double(triple) indirect before single(double) indirect, calls
* to bmap on these blocks will fail. However, we already have
* the on disk address, so we have to set the b_blkno field
* explicitly instead of letting bread do everything for us.
*/
#ifdef SECSIZE
bp = bread(ip->i_dev, fsbtodb(fs, bn), (int)fs->fs_bsize,
fs->fs_dbsize);
#else SECSIZE
vp = ITOV(ip);
bp = getblk(vp, lbn, (int)fs->fs_bsize, 0, 0);
if (bp->b_flags & (B_DONE | B_DELWRI)) {
/* Braces must be here in case trace evaluates to nothing. */
trace(TR_BREADHIT, pack(vp, fs->fs_bsize), lbn);
} else {
trace(TR_BREADMISS, pack(vp, fs->fs_bsize), lbn);
curproc->p_stats->p_ru.ru_inblock++; /* pay for read */
bp->b_flags |= B_READ;
if (bp->b_bcount > bp->b_bufsize)
panic("ffs_indirtrunc: bad buffer size");
bp->b_blkno = dbn;
VOP_STRATEGY(bp);
error = biowait(bp);
}
if (error) {
brelse(bp);
*countp = 0;
return (error);
}
bap = bp->b_un.b_daddr;
MALLOC(copy, daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK);
bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize);
bzero((caddr_t)&bap[last + 1],
(u_int)(NINDIR(fs) - (last + 1)) * sizeof (daddr_t));
if (last == -1)
bp->b_flags |= B_INVAL;
error = bwrite(bp);
if (error)
allerror = error;
bap = copy;
/*
* Recursively free totally unused blocks.
*/
for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
i--, nlbn += factor) {
nb = bap[i];
if (nb == 0)
continue;
if (level > SINGLE) {
if (error = ffs_indirtrunc(ip, nlbn,
fsbtodb(fs, nb), (daddr_t)-1, level - 1, &blkcount))
allerror = error;
blocksreleased += blkcount;
}
ffs_blkfree(ip, nb, fs->fs_bsize);
blocksreleased += nblocks;
}
/*
* Recursively free last partial block.
*/
if (level > SINGLE && lastbn >= 0) {
last = lastbn % factor;
nb = bap[i];
if (nb != 0) {
if (error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
last, level - 1, &blkcount))
allerror = error;
blocksreleased += blkcount;
}
}
FREE(copy, M_TEMP);
*countp = blocksreleased;
return (allerror);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.