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DM-bio-flush-sts_ioerr - Coggle Diagram

- - - - raid is over two sata disks
        
        each disk has different capacity
  - - - empty
        
        __send_empty_flush
- - - - write_dev_flush
        
        this case
    - - write_dev_supers
  - - - DM_MAPIO_KILL
        
        convert to BLK_STS_IOERR
      - DM_MAPIO_REQUEUE
        
        used by mpath & dm-raid
        
        dm-raid
        
        why DM_MAPIO_REQUEUE is used?
        
        used by dm-zoned
        
        how dm core handles requeue
        
        added for dealing with noflush
    - - what is DMF_NOFLUSH_SUSPENDING
        
        DM_NOFLUSH_FLAG
        
        Set this to suspend without flushing queued ios
        
        introduced for mpath
        
        commit 2e93ccc1933d08d32d9b
      - fast fail for DMF_BLOCK_IO_FOR_SUSPEND,
        
        dm_submit_bio()
    - - FS bio may be splitted to several dm bios
        
        each bio is dealt with single dm_io(tio)
        
        tio->orig_bio points to FS bio
        
        bio_inc_remaining() done in dio_submit_bio()
        
        all dm dm bios are chained together
        
        so FS bio can be completed after all dm bios are done
        
        dm's own split
        
        __split_and_process_bio
        
        max_io_len
        
        build clone and send clone via __map_bio()
    - - may return REQUEUE
        
        how does bio_end_sector() > 0?
        
        linear_map()