linux-ext4 - [PATCH] e2fsck: fix last mount/write time when e2fsck is forced

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Message-Id: <20210614132725.10339-1-lczerner@redhat.com>
Date:   Mon, 14 Jun 2021 15:27:25 +0200
From:   Lukas Czerner <lczerner@...hat.com>
To:     linux-ext4@...r.kernel.org
Cc:     Dusty Mabe <dustymabe@...hat.com>
Subject: [PATCH] e2fsck: fix last mount/write time when e2fsck is forced

With commit c52d930f e2fsck is no longer able to fix bad last
mount/write time by default because it is conditioned on s_checkinterval
not being zero, which it is by default.

One place where it matters is when other e2fsprogs tools require to run
full file system check before a certain operation. If the last mount
time is for any reason in future, it will not allow it to run even if
full e2fsck is ran.

Fix it by checking the last mount/write time when the e2fsck is forced,
except for the case where we know the system clock is broken.

Fixes: c52d930f ("e2fsck: don't check for future superblock times if checkinterval == 0")
Reported-by: Dusty Mabe <dustymabe@...hat.com>
Signed-off-by: Lukas Czerner <lczerner@...hat.com>
---
 e2fsck/super.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/e2fsck/super.c b/e2fsck/super.c
index e1c3f935..d8c1dcec 100644
--- a/e2fsck/super.c
+++ b/e2fsck/super.c
@@ -1038,9 +1038,10 @@ void check_super_block(e2fsck_t ctx)
 	 * Check to see if the superblock last mount time or last
 	 * write time is in the future.
 	 */
-	if (!broken_system_clock && fs->super->s_checkinterval &&
-	    !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
-	    fs->super->s_mtime > (__u32) ctx->now) {
+	if ((!broken_system_clock && ctx->options & E2F_OPT_FORCE) ||
+	    (!broken_system_clock && fs->super->s_checkinterval &&
+	     !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
+	     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)
@@ -1050,9 +1051,10 @@ void check_super_block(e2fsck_t ctx)
 			fs->flags |= EXT2_FLAG_DIRTY;
 		}
 	}
-	if (!broken_system_clock && fs->super->s_checkinterval &&
-	    !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
-	    fs->super->s_wtime > (__u32) ctx->now) {
+	if ((!broken_system_clock && ctx->options & E2F_OPT_FORCE) ||
+	    (!broken_system_clock && fs->super->s_checkinterval &&
+	     !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
+	     fs->super->s_wtime > (__u32) ctx->now)) {
 		pctx.num = fs->super->s_wtime;
 		problem = PR_0_FUTURE_SB_LAST_WRITE;
 		if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge)
-- 
2.26.3