Adding a uuid into the superblock on squashfs seems to resolve the
issue. Since squashfs does not have UUID support, my hack below
generates one based on some squashfs superblock metadata that provides a
good enough UUID for our purposes.
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index effa638d6d85..cfb34a75feb6 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -186,6 +186,12 @@ static int squashfs_fill_super(struct super_block *sb,
void *data, int silent)
sb->s_flags |= SB_RDONLY;
sb->s_op = &squashfs_super_ops;
+ memcpy(&sb->s_uuid.b[0], &sblk->inodes, 4);
+ memcpy(&sb->s_uuid.b[4], &sblk->mkfs_time, 4);
+ memcpy(&sb->s_uuid.b[8], &sblk->fragments, 4);
+ memcpy(&sb->s_uuid.b[12], &sblk->compression, 2);
+ memcpy(&sb->s_uuid.b[14], &sblk->block_log, 2);
+
err = -ENOMEM;
msblk->block_cache = squashfs_cache_init("metadata",
--
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https://bugs.launchpad.net/bugs/1824407
Title:
remount of multilower moved pivoted-root overlayfs root, results in
I/O errors on some modified files
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