linux-ext4 - Re: "beyond 2038" warnings from loopback mount is noisy

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Date:   Tue, 3 Sep 2019 21:50:09 -0700
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "Theodore Y. Ts'o" <tytso@....edu>, Qian Cai <cai@....pw>,
        Jeff Layton <jlayton@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Andreas Dilger <adilger.kernel@...ger.ca>
Subject: Re: "beyond 2038" warnings from loopback mount is noisy

If we don't care to warn about the timestamps that are clamped in
memory, maybe we could just warn when they are being written out.
Would something like this be more acceptable? I would also remove the
warning in ext4.h. I think we don't have to check if the inode is 128
bytes here (Please correct me if I am wrong). If this looks ok, I can
post this.

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 9e3ae3be3de9..24b14bd3feab 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -833,10 +833,8 @@ do {
                                 \
                (raw_inode)->xtime ## _extra =
         \

ext4_encode_extra_time(&(inode)->xtime);        \
                }
         \
-       else    {\
+       else    \
                (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t,
(inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
-               ext4_warning_inode(inode, "inode does not support
timestamps beyond 2038"); \
-       } \
 } while (0)

 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)
                \
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 491f9ee4040e..cef5b87cc5a6 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2791,7 +2791,7 @@ int ext4_expand_extra_isize_ea(struct inode
*inode, int new_extra_isize,

 cleanup:
        if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) {
-               ext4_warning(inode->i_sb, "Unable to expand inode %lu.
Delete some EAs or run e2fsck.",
+               ext4_warning(inode->i_sb, "Unable to expand inode %lu.
Delete some EAs or run e2fsck. Timestamps on the inode expire beyond
2038",
                             inode->i_ino);
                mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count);
        }