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a612d24e85
An empty flush bio can have arbitrary bi_sector. The commit2b1c6d7a89introduced a regression that device mapper would fail an empty flush bio with -EIO if the sector pointed beyond the end of the device. The commit introduced an optimization, that optimization would pass flushes to __split_and_process_bio and __split_and_process_bio is not prepared to handle empty bios. Fix this bug by passing only non-empty flushes to __split_and_process_bio - non-empty flushes must have valid bi_sector. Empty bios will go through __send_empty_flush, as they did before the optimization. This problem can be reproduced by running the lvm2 test: make check_local T=lvconvert-thin.sh LVM_TEST_PREFER_BRD=0 Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Fixes:2b1c6d7a89("dm: optimize REQ_PREFLUSH with data when using the linear target") Reported-by: Zdenek Kabelac <zkabelac@redhat.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org>
3811 lines
89 KiB
3811 lines
89 KiB