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Date: Fri, 13 Mar 2015 17:31:18 -0500
From: Eric Sandeen <sandeen@...hat.com>
To: ext4 development <linux-ext4@...r.kernel.org>
Subject: How is e2fsck's time_fudge supposed to behave?
I'm a little confused by e2fsck's time fudge current behavior, vs its
apparent intent.
We do:
if ( ... &&
fs->super->s_mtime > (__u32) ctx->now) {
pctx.num = fs->super->s_mtime;
problem = PR_0_FUTURE_SB_LAST_MOUNT;
if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge)
problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED;
if (fix_problem(ctx, problem, &pctx)) {
fs->super->s_mtime = ctx->now;
fs->flags |= EXT2_FLAG_DIRTY;
}
So if we are inside the time_fudge value we simply change the problem,
but PR_0_FUTURE_SB_LAST_MOUNT_FUDGED behaves exactly like
PR_0_FUTURE_SB_LAST_MOUNT, other than the message:
/* Last mount time is in the future (fudged) */
{ PR_0_FUTURE_SB_LAST_MOUNT_FUDGED,
N_("@S last mount time is in the future.\n\t(by less than a day, "
"probably due to the hardware clock being incorrectly set) "),
PROMPT_FIX, PR_PREEN_OK | PR_NO_OK },
vs:
/* Last mount time is in the future */
{ PR_0_FUTURE_SB_LAST_MOUNT,
N_("@S last mount time (%t,\n\tnow = %T) is in the future.\n"),
PROMPT_FIX, PR_PREEN_OK | PR_NO_OK },
So unless I'm missing something, the whole fudge_time dance does nothing
except change the message, and after reading lots of words in the e2fsck.conf
manpage ;) this bit seems relevant as to the intent:
> So by default, we allow the superblock times to
> be fudged by up to 24 hours.
I had the impression that "allow" meant "ignore" but this still triggers
exactly the same action and correction. Is that as intended?
I'll send a patch do a printf and take no other action if inside the
fudge_time window, if that seems like the right thing to do.
Thanks,
-Eric
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