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add comments to make it clearer what cmpsblks() is doing

This commit is contained in:
lukem 2001-09-18 08:38:28 +00:00
parent 3527d3dfa5
commit 22966108bb
1 changed files with 14 additions and 3 deletions
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17
sbin/fsck_ffs/setup.c
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@ -1,4 +1,4 @@
/* $NetBSD: setup.c,v 1.49 2001/09/06 02:16:00 lukem Exp $ */
/* $NetBSD: setup.c,v 1.50 2001/09/18 08:38:28 lukem Exp $ */
/*
* Copyright (c) 1980, 1986, 1993
@ -38,7 +38,7 @@
#if 0
static char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95";
#else
__RCSID("$NetBSD: setup.c,v 1.49 2001/09/06 02:16:00 lukem Exp $");
__RCSID("$NetBSD: setup.c,v 1.50 2001/09/18 08:38:28 lukem Exp $");
#endif
#endif /* not lint */
@ -577,6 +577,13 @@ int
cmpsblks(const struct fs *sb, struct fs *asb)
{
/*
* Copy fields which we don't care if they're different in the
* alternate superblocks, as they're either likely to be
* different because they're per-cylinder-group specific, or
* because they're transient details which are only maintained
* in the primary superblock.
*/
asb->fs_firstfield = sb->fs_firstfield;
asb->fs_unused_1 = sb->fs_unused_1;
asb->fs_time = sb->fs_time;
@ -603,7 +610,7 @@ cmpsblks(const struct fs *sb, struct fs *asb)
memmove(asb->fs_sparecon,
sb->fs_sparecon, sizeof sb->fs_sparecon);
/*
* The following should not have to be copied.
* The following should not have to be copied, but need to be.
*/
asb->fs_fsbtodb = sb->fs_fsbtodb;
asb->fs_interleave = sb->fs_interleave;
@ -614,6 +621,10 @@ cmpsblks(const struct fs *sb, struct fs *asb)
asb->fs_state = sb->fs_state;
asb->fs_maxfilesize = sb->fs_maxfilesize;
/*
* Compare the superblocks, effectively checking every other
* field to see if they differ.
*/
return (memcmp(sb, asb, (int)sb->fs_sbsize));
}