[Bugs] [Bug 1431955] [Disperse] Implement open fd heal for disperse volume

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1431955



--- Comment #2 from Sunil Kumar Acharya <sheggodu at redhat.com> ---
Steps to re-create/test:

1. Created and mounted an EC (2+1) volume. Heal disabled.

[root at server3 ~]# gluster volume info

Volume Name: ec-vol
Type: Disperse
Volume ID: b676891f-392d-49a6-891c-8e7e3790658d
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x (2 + 1) = 3
Transport-type: tcp
Bricks:
Brick1: server1:/LAB/store/ec-vol
Brick2: server2:/LAB/store/ec-vol
Brick3: server3:/LAB/store/ec-vol
Options Reconfigured:
cluster.disperse-self-heal-daemon: disable               <<<<<
transport.address-family: inet
nfs.disable: on
disperse.background-heals: 0                             <<<<<
[root at server3 ~]#

2. Touched a file on the mountpoint.

# touch file

3. Brought down one of the brick process.

4. Opened a file descriptor for the file.

# exec 30<> file

5. Brought up the brick process which was down.

6. Wrote to the FD.

# echo "abc" >&30

7. File status on clinet and bricks after write completes.

Client:

[root at varada mount]# ls -lh file 
-rw-r--r--. 1 root root 4 Mar 27 17:11 file
[root at varada mount]# du -kh file 
1.0K    file
[root at varada mount]# 

Bricks:

[root at server1 ~]# du -kh /LAB/store/ec-vol/file
4.0K    /LAB/store/ec-vol/file
[root at server1 ~]# ls -lh /LAB/store/ec-vol/file
-rw-r--r-- 2 root root 0 Mar 27 17:08 /LAB/store/ec-vol/file
[root at server1 ~]# cat /LAB/store/ec-vol/file
[root at server1 ~]# 

[root at server2 ~]# du -kh /LAB/store/ec-vol/file
8.0K    /LAB/store/ec-vol/file
[root at server2 ~]# ls -lh /LAB/store/ec-vol/file
-rw-r--r-- 2 root root 512 Mar 27 17:11 /LAB/store/ec-vol/file
[root at server2 ~]# cat /LAB/store/ec-vol/file
abc
[root at server2 ~]# 

[root at server3 ~]# du -kh /LAB/store/ec-vol/file
8.0K    /LAB/store/ec-vol/file
[root at server3 ~]# ls -lh /LAB/store/ec-vol/file
-rw-r--r-- 2 root root 512 Mar 27 17:11 /LAB/store/ec-vol/file
[root at server3 ~]# cat /LAB/store/ec-vol/file
abc
abc
[root at server3 ~]#

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