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Fix buffer handling problems in lfs_vinvalbuf

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This commit is contained in:
perseant 1999-04-01 23:28:09 +00:00
parent 87af70d729
commit 7ea5ec6723
1 changed files with 36 additions and 19 deletions
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55
sys/ufs/lfs/lfs_inode.c
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@ -1,4 +1,4 @@
/* $NetBSD: lfs_inode.c,v 1.21 1999/03/29 21:51:38 perseant Exp $ */
/* $NetBSD: lfs_inode.c,v 1.22 1999/04/01 23:28:09 perseant Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -262,6 +262,7 @@ lfs_truncate(v)
/*
* Update 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
* must be zero'd in case it ever becomes accessible again
* because of subsequent file growth. For this part of the code,
* oldsize_newlast refers to the old size of the new last block in the
* file.
@ -442,7 +443,7 @@ lfs_truncate(v)
#endif
fs->lfs_avail += fragstodb(fs, a_released);
if(length>0)
e1 = lfs_vinvalbuf(vp, ap->a_cred, ap->a_p, lastblock);
e1 = lfs_vinvalbuf(vp, ap->a_cred, ap->a_p, lastblock-1);
else
e1 = vinvalbuf(vp, 0, ap->a_cred, ap->a_p, 0, 0);
e2 = VOP_UPDATE(vp, NULL, NULL, 0);
@ -467,8 +468,10 @@ lfs_vinvalbuf(vp, cred, p, maxblk)
{
register struct buf *bp;
struct buf *nbp, *blist;
int i, s, error;
int i, s, error, dirty;
top:
dirty=0;
for (i=0;i<2;i++) {
if(i==0)
blist = vp->v_cleanblkhd.lh_first;
@ -477,7 +480,15 @@ lfs_vinvalbuf(vp, cred, p, maxblk)
for (bp = blist; bp; bp = nbp) {
nbp = bp->b_vnbufs.le_next;
s = splbio();
if (bp->b_flags & B_GATHERED) {
error = tsleep(vp, PRIBIO+1, "lfs_vin2", 0);
splx(s);
if(error)
return error;
goto top;
}
if (bp->b_flags & B_BUSY) {
bp->b_flags |= B_WANTED;
error = tsleep((caddr_t)bp,
@ -485,29 +496,35 @@ lfs_vinvalbuf(vp, cred, p, maxblk)
splx(s);
if (error)
return (error);
break;
goto top;
}
/*
* Don't touch gathered buffers; and certainly don't
* mark cleaner buffers B_INVAL, since that would
* change them to "fake buffers".
*
* But get rid of anything else that's past the new
* last block.
*/
bp->b_flags |= B_BUSY;
splx(s);
if((bp->b_lblkno >= 0 && bp->b_lblkno > maxblk)
|| (bp->b_lblkno < 0 && bp->b_lblkno < -maxblk-NIADDR))
|| (bp->b_lblkno < 0 && bp->b_lblkno < -maxblk-(NIADDR-1)))
{
if(!(bp->b_flags & (B_GATHERED|B_CALL)))
bp->b_flags |= B_INVAL;
}
if(bp->b_flags & B_CALL)
bp->b_flags |= B_INVAL | B_VFLUSH;
if(bp->b_flags & B_CALL) {
lfs_freebuf(bp);
} else {
brelse(bp);
}
++dirty;
} else {
/*
* This buffer is still on its free list.
* So don't brelse, but wake up any sleepers.
*/
bp->b_flags &= ~B_BUSY;
else
brelse(bp);
if(bp->b_flags & B_WANTED) {
bp->b_flags &= ~(B_WANTED|B_AGE);
wakeup(bp);
}
}
}
}
if(dirty)
goto top;
return (0);
}