glusterfs.git/xlators/features, branch round-robin2

changelog/rpc: Fix rpc_clnt_t mem leaks

2016-07-22T15:12:52+00:00

PROBLEM:
   1. Freeing up rpc_clnt object might lead to crashes. Well,
      it was not a necessity to free rpc-clnt object till now
      because all the existing use cases needs to reconnect
      back on disconnects. Hence timer code was not taking
      ref on rpc-clnt object.

      Glusterd had some use-cases that led to crash due to
      ping-timer and they fixed only those code paths that
      involve ping-timer.

      Now, since changelog has an use-case where rpc-clnt
      need to be freed up, we need to fix timer code to take
      refs

   2. In changelog, because of issue 1, only mydata was being
      freed which is incorrect. And there are races where
      rpc-clnt object would access the freed mydata which
      would lead to crashes.

      Since changelog xlator resides on brick side and is long
      living process, if multiple libgfchangelog consumers
      register to changelog and disconnect/reconnect mulitple
      times, it would result in leak of 'rpc-clnt' object
      for every connect/disconnect.

SOLUTION:
   1. Handle ref/unref of 'rpc_clnt' structure in timer
      functions properly.
   2. In changelog, unref 'rpc_clnt' in RPC_CLNT_DISCONNECT
      after disabling timers and free mydata on RPC_CLNT_DESTROY.

RPC SETUP IN CHANGELOG:
   1. changelog xlator initiates rpc server say 'changelog_rpc_server'
   2. libgfchangelog initiates one rpc server say 'libgfchangelog_rpc_server'
   3. libgfchangelog initiates rpc client and connects to 'changelog_rpc_server'
   4. In return changelog_rpc_server initiates a rpc client and connects back
      to 'libgfchangelog_rpc_server'

REF/UNREF HANDLING IN TIMER FUNCTIONS:
Let's say rpc clnt refcount = 1
   1. Take the ref before reigstering callback to timer queue
           >>>>  rpc_clnt_ref (say ref count becomes = 2)
   2. Register a callback to timer say 'callback1'
   3. If register fails:
           >>>> rpc_clnt_unref (ref count = 1)
   4. On timer expiration, 'callback1' gets called. So unref rpc clnt at the end
      in 'callback1'. This is corresponding to ref taken in step 1
           >>>> rpc_clnt_unref (ref count = 1)
   5. The cycle from step-1 to step-4 continues....until timer cancel event happens
   6. timer cancel of say 'callback1'
           If timer cancel fails:
                 Do nothing, Step-4 would have unrefd
           If timer cancel succeeds:
                 >>>> rpc_clnt_unref (ref count = 1)

Change-Id: I91389bc511b8b1a17824941970ee8d2c29a74a09
BUG: 1316178
Signed-off-by: Kotresh HR 
Reviewed-on: http://review.gluster.org/13658
Smoke: Gluster Build System 
NetBSD-regression: NetBSD Build System 
CentOS-regression: Gluster Build System 
Reviewed-by: Raghavendra G

feature/bitrot: Ignore files with sticky bit set

2016-07-21T13:59:49+00:00

Scrubber scrubs entries in backend. It is scrubbing files with sticky
bit as well. This might include linkfiles which should be skipped.  This
patch adds the check to ignore linkfiles during scrub.

Change-Id: Ic21367b37770d391326c55c659491a1e5a82335b
BUG: 1355706
Signed-off-by: Kotresh HR 
Reviewed-on: http://review.gluster.org/14903
Smoke: Gluster Build System 
CentOS-regression: Gluster Build System 
CentOS-regression: NetBSD Build System 
NetBSD-regression: NetBSD Build System 
Reviewed-by: Jeff Darcy

feature/bitrot: Fix scrub status with sharded volume

2016-07-19T14:41:09+00:00

Bitrot scrubs each shard entries separately. Scrub
statistics was counting each shard entry which is
incorrect. This patch skips the statistics count
for sharded entries.

Change-Id: I184c315a4bc7f2cccabc506eef083ee926ec26d3
BUG: 1356851
Signed-off-by: Kotresh HR 
Reviewed-on: http://review.gluster.org/14927
Smoke: Gluster Build System 
CentOS-regression: Gluster Build System 
NetBSD-regression: NetBSD Build System 
Reviewed-by: Jeff Darcy 
Reviewed-by: Vijay Bellur

xlator/trash : append '/' at the end in trash_notify_lookup_cbk

2016-07-19T13:16:11+00:00

In the notify function in trash xlator, a lookup is performed
to obtain path of old trash directory. The result usually contains
path without '/' at the end. The trash xlator maintains expects
'/' at the end for the values such as 'old trash dir' and
'new trash dir'. Otherwise certian checks in the code will fail.

Change-Id: I89e02e4b249314fb6536297f959865feee182c83
BUG: 1357397
Signed-off-by: Jiffin Tony Thottan 
Reviewed-on: http://review.gluster.org/14938
Smoke: Gluster Build System 
CentOS-regression: Gluster Build System 
Reviewed-by: Anoop C S 
NetBSD-regression: NetBSD Build System 
Reviewed-by: Jeff Darcy

build: fix sprintf format for uint64_t in gf_worm_serialize_state()

2016-07-18T20:56:10+00:00

When building on 32-bit architectures, the following warning gets
reported:

    worm-helper.c: In function 'gf_worm_serialize_state':
    worm-helper.c:219: warning: format '%ld' expects type 'long int', but argument 4 has type 'uint64_t'
    worm-helper.c:219: warning: format '%ld' expects type 'long int', but argument 5 has type 'uint64_t'

The format string "%ld" depend on the architecture. If the type is very
specific (here unint64_t), the dynamicness of "%ld" is not correct.
There are macros for these fixed types in  and even some
more in "logging.h" from libglusterfs.

BUG: 1198849
Change-Id: I63eeb9c8e4d7b292ce0c9333938ca365db0823fc
Signed-off-by: Niels de Vos 
Reviewed-on: http://review.gluster.org/14934
NetBSD-regression: NetBSD Build System 
Smoke: Gluster Build System 
CentOS-regression: Gluster Build System 
Reviewed-by: Kaleb KEITHLEY

features/bitrot: Move throttling code to libglusterfs

2016-07-18T12:03:17+00:00

Since throttling is a separate feature by itself,
move throttling code to libglusterfs.

Change-Id: If9b99885ceb46e5b1865a4af18b2a2caecf59972
BUG: 1352019
Signed-off-by: Kotresh HR 
Reviewed-on: http://review.gluster.org/14846
Smoke: Gluster Build System 
CentOS-regression: Gluster Build System 
NetBSD-regression: NetBSD Build System 
Reviewed-by: Ravishankar N 
Reviewed-by: Jeff Darcy

quota: corrected minor spelling mistakes in quota src files

2016-07-18T12:01:22+00:00

Change-Id: I85420ca5f89ce9d576a81be22d8c2003f109b476
BUG: 1356032
Signed-off-by: mvignesh@redhat.com 
Reviewed-on: http://review.gluster.org/14917
Reviewed-by: Manikandan Selvaganesh 
Smoke: Gluster Build System 
NetBSD-regression: NetBSD Build System 
CentOS-regression: Gluster Build System 
Reviewed-by: Jeff Darcy

core: use readdir(3) with glibc, and associated cleanup

2016-07-18T11:59:42+00:00

Starting with glibc-2.23 (i.e. what's in Fedora 25), readdir_r(3)
is marked as deprecated. Specifically the function decl in 
has the deprecated attribute, and now warnings are thrown during the
compile on Fedora 25 builds.

The readdir(_r)(3) man page (on Fedora 25 at least) and World+Dog say
that glibc's readdir(3) is, and always has been, MT-SAFE as long as
only one thread is accessing the directory object returned by opendir().
World+Dog also says there is a potential buffer overflow in readdir_r().
World+Dog suggests that it is preferable to simply use readdir(). There's
an implication that eventually readdir_r(3) will be removed from glibc.
POSIX has, apparently deprecated it in the standard, or even removed it
entirely.

Over and above that, our source near the various uses of readdir(_r)(3)
has a few unsafe uses of strcpy()+strcat().

(AFAIK nobody has looked at the readdir(3) implemenation in *BSD to see
if the same is true on those platforms, and we can't be sure of MacOS
even though we know it's based on *BSD.)

Change-Id: I5481f18ba1eebe7ee177895eecc9a80a71b60568
BUG: 1356998
Signed-off-by: Kaleb S. KEITHLEY 
Reviewed-on: http://review.gluster.org/14838
Smoke: Gluster Build System 
Reviewed-by: Niels de Vos 
CentOS-regression: Gluster Build System 
NetBSD-regression: NetBSD Build System 
Reviewed-by: Kotresh HR 
Reviewed-by: Jeff Darcy

core: add a basis function to reduce verbose code

2016-07-18T11:59:05+00:00

Change-Id: Icebe1b865edb317685e93f3ef11d98fd9b2c2e9a
BUG: 1357226
Signed-off-by: Zhou Zhengping 
Reviewed-on: http://review.gluster.org/14936
Reviewed-by: Niels de Vos 
Smoke: Gluster Build System 
CentOS-regression: Gluster Build System 
NetBSD-regression: NetBSD Build System

features/locks: Add lock revocation functionality to posix locks translator

2016-07-18T09:30:38+00:00

Summary:
- Motivation: Prevents cluster instability by mis-behaving clients
causing bricks to OOM due to inode/entry lock pile-ups.
- Adds option to strip clients of entry/inode locks after N seconds
- Adds option to clear ALL locks should the revocation threshold get hit
- Adds option to clear all or granted locks should the max-blocked
threshold get hit (can be used in combination w/ revocation-clear-all).
- Options are:
features.locks-revocation-secs
features.locks-revocation-clear-all [on/off]
features.locks-revocation-max-blocked
- Adds monkey-locking option to ignore 1% of unlock requests (dev only)
features.locks-monkey-unlocking [on/off]
- Adds logging to indicate revocation event & reason

Test Plan:
First you will need TWO fuse mounts for this repro. Call them /mnt/patchy1 & /mnt/patchy2.

1. Enable monkey unlocking on the volume:
gluster vol set patchy features.locks-monkey-unlocking on

2. From the "patchy1", use DD or some other utility to begin writing to a file,
eventually the dd will hang due to the dropped unlocked requests. This now
simulates the broken client. Run:

for i in {1..1000};do dd if=/dev/zero of=/mnt/patchy1/testfile bs=1k count=10;done'

...this will eventually hang as the unlock request has been lost.

3. Goto another window and setup the mount "patchy2" @ /mnt/patchy2, and
observe that 'echo "hello" >> /mnt/patchy2/testfile" will hang due to the
inability of the client to take out the required lock.

4. Next, re-start the test this time enabling lock revocation; use a timeout of
2-5 seconds for testing:
'gluster vol set patchy features.locks-revocation-secs <2-5>'

5. Wait 2-5 seconds before executing step 3 above this time. Observe that this
time the access to the file will succeed, and the writes on patchy1 will
unblock until they hit another failed unlock request due to
"monkey-unlocking".

BUG: 1350867
Change-Id: I814b9f635fec53834a26db634d1300d9a61057d8
Signed-off-by: Pranith Kumar K
Reviewed-on: http://review.gluster.org/14816
NetBSD-regression: NetBSD Build System
Reviewed-by: Krutika Dhananjay
CentOS-regression: Gluster Build System
Smoke: Gluster Build System