See
ext2_new_inode() in `fs/ext2/ialloc.c'.
Actually, this output is from an old version of lsattr, that doesn't show as many flags as the current version.
I haven't yet checked any of this.
More accurately, the test is
based on whether or not the EXT2_COMPRBLK_FL flag is set for the
file. In some, rare, circumstances, the EXT2_COMPRBLK_FL flag
can still be set even when no clusters of that
file are compressed.
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