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Performance enhancement from Kirk McKusick <mckusick@McKusick.COM>: 

When freeing an indirect block, there is no need to write it (synchronously,
no less!) before tossing it.
This commit is contained in:
thorpej 1996-11-06 03:02:59 +00:00
parent ccce082dd2
commit 34e2fb3bb6
1 changed files with 20 additions and 13 deletions
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33
sys/ufs/ffs/ffs_inode.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ffs_inode.c,v 1.11 1996/09/01 23:49:21 mycroft Exp $ */
/* $NetBSD: ffs_inode.c,v 1.12 1996/11/06 03:02:59 thorpej Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
@ -397,7 +397,7 @@ ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
register struct fs *fs = ip->i_fs;
register daddr_t *bap;
struct vnode *vp;
daddr_t *copy, nb, nlbn, last;
daddr_t *copy = NULL, nb, nlbn, last;
long blkcount, factor;
int nblocks, blocksreleased = 0;
int error = 0, allerror = 0;
@ -444,16 +444,16 @@ ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
}
bap = (daddr_t *)bp->b_data;
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;
if (lastbn != -1) {
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));
error = bwrite(bp);
if (error)
allerror = error;
bap = copy;
}
/*
* Recursively free totally unused blocks.
@ -489,7 +489,14 @@ ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
blocksreleased += blkcount;
}
}
FREE(copy, M_TEMP);
if (copy != NULL) {
FREE(copy, M_TEMP);
} else {
bp->b_flags |= B_INVAL;
brelse(bp);
}
*countp = blocksreleased;
return (allerror);
}