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Function jbd2_journal_shrink_checkpoint_list() assumes that '0' is not a valid value for transaction IDs, which is incorrect. Furthermore, the sbi->s_fc_ineligible_tid handling also makes the same assumption by being initialised to '0'. Fortunately, the sb flag EXT4_MF_FC_INELIGIBLE can be used to check whether sbi->s_fc_ineligible_tid has been previously set instead of comparing it with '0'. Signed-off-by: Luis Henriques (SUSE) <luis.henriques@linux.dev> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://patch.msgid.link/20240724161119.13448-5-luis.henriques@linux.dev Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org