glusterfs.git/xlators/cluster/dht/src/dht-diskusage.c, branch v4.1.8

dht: Send an event when disks get full

2017-12-09T00:47:46+00:00

Send an event if DHT determines that a subvol is getting
full or running out of inodes.

Change-Id: Ie026f4ee1832b5df1e80b16cb949b2cc31a25d6f
Bug: 1440659
Signed-off-by: Ankit raj 
Signed-off-by: N Balachandran

cluster/dht: Check for NULL before using variable

2017-11-06T07:05:31+00:00

Coverity ID: 245
Check statvfs received as cbk before using it

Coverity ID: 228
Check NULL loc before freeing it.

Change-Id: I1b153ed5e7b81bcf7033bf710808e95908dcfef4
BUG: 789278
Signed-off-by: Ashish Pandey

cluster/dht: Skip file migration if the subvol that meets min-free-disk

2017-04-19T05:35:14+00:00

criteria happens to be the same subvol containing data-file

Rebalance need to figure out a new subvol in case the hashed subvol
does not have enough space. In the process of figuring out the new subvol,
we need to ignore the source subvol, otherwise it will lead to data loss.

Test: Manual
Ran the following
sizeof /tmp/1: 1.5GB
sizeof /brick/1: 16GB
sizeof /tmp/2: 1.5GB


glusterd;  gluster v create test1 vm1:/brick/1 vm1:/tmp/1;
gluster v start test1;
mount -t glusterfs vm1:test1 /mnt;
for i in {1..2000}
do
dd if=/dev/zero of=/mnt/file$i bs=1KB count=1 &> /dev/null;
done
gluster v add-brick test1 vm1:/tmp/2
gluster v set test1 min-free-disk 12GB
gluster v remove-brick test1 vm1:/tmp/1 star


file count and data were intact.

Change-Id: Ib8fc8467a3d48a7c12958824c4f0b88e160b86c1
BUG: 1441508
Signed-off-by: Susant Palai 
Reviewed-on: https://review.gluster.org/17064
Smoke: Gluster Build System 
NetBSD-regression: NetBSD Build System 
CentOS-regression: Gluster Build System 
Reviewed-by: Raghavendra G

cluster/dht: Make rebalance honor min-free-disk

2017-04-13T09:57:42+00:00

test:  Manual

created files of size 1K on 2 brick(of size 1GB) setup .
added a brick of size 16GB.
set min-free-disk to 12GB(so that first two bricks won't receive any files).
removed one of the 1st brick of size 1GB.

Logs from test:
[2017-04-12 08:52:08.196484] W [MSGID: 0] [dht-rebalance.c:895:__dht_check_free_space]
 0-test1-dht: Write will cross min-free-disk for file - /tile32 on subvol - test1-client-1.
Looking for new subvol.

[2017-04-12 08:52:08.196904] I [MSGID: 0] [dht-rebalance.c:925:__dht_check_free_space]
0-test1-dht: new target found - test1-client-2 for file - /tile32

 - Post migration we have two files. The new destination (/brick/1) has the data file
[root@vm1 ~]# ll /brick/1/tile32
-rw-r--r--. 2 root root 0 Apr 12 14:22 /brick/1/tile32

 - On the old target the linkto file is there with linkto xattr pointing to /brick/1
[root@vm1 ~]# ll /tmp/2/tile32
---------T. 2 root root 1000 Apr 12 14:22 /tmp/2/tile32
[root@vm1 ~]# getfattr -m . -de text /tmp/2/tile32
getfattr: Removing leading '/' from absolute path names
security.selinux="unconfined_u:object_r:user_tmp_t:s0"
trusted.gfid="����:Aс�#�/'b2"
trusted.glusterfs.dht.linkto="test1-client-2"

Marking ./tests/features/worm_sh.t as bad test.
Reason being, this patch failed on master branch as well and it has nothing
to do with rebalance/remove-brick.

BUG: 1441508
Change-Id: I90bae251cda3d957a49cdceda90cd08311a392fb
Signed-off-by: Susant Palai 
Reviewed-on: https://review.gluster.org/17034
Smoke: Gluster Build System 
NetBSD-regression: NetBSD Build System 
Reviewed-by: Amar Tumballi 
Reviewed-by: Raghavendra G 
CentOS-regression: Gluster Build System

dht: At places needed use STACK_WIND_COOKIE

2017-01-09T18:37:02+00:00

Issue:
frame has a void * cookie pointer.
In case of STACK_WIND_COOKIE frame->cookie is assigned
to what is sent by the caller.
In case of STACK_WIND frame->cookie is assigned to point
point to the frame itself.

For ease of coding, at many places, the cookie in the cbk
is used to get the pointer to the next xl. This is
inconsistent when STACK_WIND_TAIL comes into picture.

Eg: dht_setxattr () {
    for (i = 0 ; i < conf->subvolume_cnt ; i++) {
       STACK_WIND (..dht_checking_pathinfo_cbk,
                   conf->subvolumes[i] ..);
    }

    dht_checking_pathinfo_cbk (...void *cookie...) {
        prev = cookie;
        ...
        for (i = 0; i < conf->subvolume_cnt; i++) {
            if (conf->subvolumes[i] == prev->this) {
                 ...
            }
        }
    }

    Consider the below graph:
    dht (parent)
    readdir-ahead  => Doesn't define setxattr and uses STACK_WIND_TAIL
    protocol-client

    With this graph, when dht_checking_pathinfo_cbk is called,
    cookie will have frame pointing to protocol-client.
    i.e. prev->this will be protocol-client. But dht was expecting
    it to be readdir-ahead as it has stored in conf->subvolumes[i]

Solution:
    Hence, as a thumb rule, if cbk is using cookie, then we explicitly
    call STACK_WIND_COOKIE.

Change-Id: I83aea1e24c809c5a91a0db7283e908e125471bd4
BUG: 1401812
Signed-off-by: Poornima G 
Reviewed-on: http://review.gluster.org/16039
Reviewed-by: Raghavendra G 
Smoke: Gluster Build System 
NetBSD-regression: NetBSD Build System 
CentOS-regression: Gluster Build System

dht: missleading indendentation, gcc-6

2016-01-06T02:07:37+00:00

gcc-6 now has -Wmisleading-indentation as part of -Wall.

compiling with gcc-6 gives this warning.

...
dht-diskusage.c: In function ‘dht_subvol_has_err’:
dht-diskusage.c:361:33: warning: statement is indented as if it were
guarded by... [-Wmisleading-indentation]
                                 goto out;
                                 ^~~~

dht-diskusage.c:358:25: note: ...this ‘if’ clause, but it is not
                         if (conf->decommissioned_bricks[i] &&
                         ^~
...

Inspection of the source shows that without braces the loop is
terminated prematurely.

Change-Id: Ica48a8c59ee5d0a206797827d7920259d33b47ec
BUG: 1295784
Signed-off-by: Kaleb S KEITHLEY 
Reviewed-on: http://review.gluster.org/13176
Reviewed-by: N Balachandran 
Reviewed-by: Shyamsundar Ranganathan 
Tested-by: Gluster Build System

dht: block/handle create op falling to decommissioned brick

2015-08-24T06:06:31+00:00

Problem:
Post remove-brick start till commit phase, the client layout
may not be in sync with disk layout because of lack of lookup.
Hence,a create call may fall on the decommissioned brick.

Solution:
Will acquire a lock on hashed subvol. So that a fix-layout or
selfheal can not step on layout while reading the layout.

Even if we read a layout before remove-brick fix-layout and the
file falls on the decommissioned brick, the file should be
migrated to a new brick as per the fix-layout.

Change-Id: If84a12ec34f981adb2b9b224e80f535cfe5bf9f2
BUG: 1232378
Signed-off-by: Susant Palai 
Reviewed-on: http://review.gluster.org/11260
Tested-by: Gluster Build System 
Tested-by: NetBSD Build System 
Reviewed-by: Raghavendra G

dht: Adding log messages to the new logging framework

2015-06-24T05:15:10+00:00

Change-Id: Ib3bb61c5223f409c23c68100f3fe884918d2dc3f
BUG: 1194640
Signed-off-by: arao 
Reviewed-on: http://review.gluster.org/10021
Reviewed-by: N Balachandran 
Reviewed-by: Joseph Fernandes
Tested-by: Joseph Fernandes
Reviewed-by: Dan Lambright 
Reviewed-by: Raghavendra G 
Tested-by: Raghavendra G

build: do not #include "config.h" in each file

2015-05-29T12:43:17+00:00

Instead of including config.h in each file, and have the additional
config.h included from the compiler commandline (-include option).

When a .c file tests for a certain #define, and config.h was not
included, incorrect assumtions were made. With this change, it can not
happen again.

BUG: 1222319
Change-Id: I4f9097b8740b81ecfe8b218d52ca50361f74cb64
Signed-off-by: Niels de Vos 
Reviewed-on: http://review.gluster.org/10808
Tested-by: Gluster Build System 
Tested-by: NetBSD Build System
Reviewed-by: Kaleb KEITHLEY 
Reviewed-by: Pranith Kumar Karampuri

dht: suggest to add more bricks when min-free-disk is exceeded.

2015-03-18T11:33:01+00:00

Change-Id: I628fbd99c2478fcb8bb6e5be55e43467f25227bf
BUG: 1165870
Signed-off-by: Humble Devassy Chirammal 
Reviewed-on: http://review.gluster.org/9879
Tested-by: Gluster Build System 
Reviewed-by: Lalatendu Mohanty 
Reviewed-by: Kaleb KEITHLEY