[Bugs] [Bug 1448307] Seeing Input/ Output error in rebalance logs during a rebalance on an ec volume( log level=Debug)

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1448307



--- Comment #1 from Nithya Balachandran <nbalacha at redhat.com> ---
Rebalance fails to migrate files on EC volumes:


[2017-05-03 07:37:35.643291] E [MSGID: 109023]
[dht-rebalance.c:740:__dht_rebalance_create_dst_file] 0-ecv-dht: fallocate
failed for /dir1/linux-4.10.4/include/linux/smpboot.h on ecv-disperse-1
(Operation not supported)
[2017-05-03 07:37:35.643320] E [MSGID: 0]
[dht-rebalance.c:1516:dht_migrate_file] 0-ecv-dht: Create dst failed on -
ecv-disperse-1 for file - /dir1/linux-4.10.4/include/linux/smpboot.h



RCA: 

The rebalance code was recently changed to use fallocate when creating the dst
file. However it looks like this is not supported on EC volumes:


 736 int32_t ec_gf_fallocate(call_frame_t * frame, xlator_t * this, fd_t * fd,  
 737                         int32_t keep_size, off_t offset, size_t len,       
 738                         dict_t * xdata)                                    
 739 {                                                                          
 740     default_fallocate_failure_cbk(frame, ENOTSUP);                         
 741                                                                            
 742     return 0;                                                              
 743 }  


With this change, rebalance will fail on EC volumes.

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