[Bugs] [Bug 1252302] New: Inconsistent stat (ls -l) results when using BD xlator

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1252302

            Bug ID: 1252302
           Summary: Inconsistent stat (ls -l) results when using BD xlator
           Product: GlusterFS
           Version: 3.6.4
         Component: core
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: sog at msg.com.mx
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
Only the first "ls -l" after fuse-mount a replica 2 volume using BD xlator,
shows the expected values (sizes, mtime, etc). The volumes works as expected
with qemu but virsh and virt-manager show lvs with a zero size.

Version-Release number of selected component (if applicable):
Fedora 22
GlusterFS 3.6.4

Steps to Reproduce:
1. fuse mount a glusterfs volume with some lvs exported
2. ls -lh the mount point
3. ls -lh again.

Actual results:
The second and subsequent ls, show the attrs of the posix brick, not the ones
generated by the db xlator. Other operations show inconsistent results.

Example:
[root at monica mnt]# mount -t glusterfs erika:matias tt
[root at monica mnt]# ls -lh tt
total 514G
-rw-r--r--. 1 qemu root 120G Aug 11 00:32 all_sog
-rw-r--r--. 1 root root    0 Jul 28 07:48 devel
-rw-r--r--. 1 qemu root  90G Aug 11 00:32 extras
-rw-r--r--. 1 qemu root 300G Aug 11 00:41 mirrors
-rw-r--r--. 1 root root    0 Jul 28 07:48 people
-rw-r--r--. 1 qemu root 4.0G Aug 11 00:40 TamTest
[root at monica mnt]# ls -lh tt
total 0
-rw-r--r--. 1 qemu qemu 0 Aug 10 14:15 all_sog
-rw-r--r--. 1 root root 0 Jul 28 07:48 devel
-rw-r--r--. 1 qemu qemu 0 Aug 10 14:15 extras
-rw-r--r--. 1 qemu qemu 0 Aug 11 00:41 mirrors
-rw-r--r--. 1 root root 0 Jul 28 07:48 people
-rw-r--r--. 1 qemu qemu 0 Aug 11 00:40 TamTest
[root at monica mnt]# cd tt
[root at monica tt]# stat mirrors 
  File: ‘mirrors’
  Size: 0             Blocks: 0          IO Block: 131072 regular empty file
Device: 2eh/46d    Inode: 12349220777661360721  Links: 1
Access: (0644/-rw-r--r--)  Uid: (  107/    qemu)   Gid: (  107/    qemu)
Context: system_u:object_r:fusefs_t:s0
Access: 2015-08-11 01:33:50.734322000 -0500
Modify: 2015-08-11 01:33:50.734322000 -0500
Change: 2015-08-11 01:33:50.734560428 -0500
 Birth: -
[root at monica tt]# stat mirrors 
  File: ‘mirrors’
  Size: 322122547200    Blocks: 629145600  IO Block: 131072 regular file
Device: 2eh/46d    Inode: 12349220777661360721  Links: 1
Access: (0644/-rw-r--r--)  Uid: (  107/    qemu)   Gid: (    0/    root)
Context: system_u:object_r:fusefs_t:s0
Access: 2015-08-05 12:41:47.440154000 -0500
Modify: 2015-08-11 01:34:02.702373769 -0500
Change: 2015-08-11 00:29:34.679467362 -0500

Additional info:
[root at erika ~]# gluster volume info matias

Volume Name: matias
Type: Replicate
Volume ID: 005ed81a-de13-442d-b56d-d1f4c65da71f
Status: Started
Xlator 1: BD
Capability 1: offload_copy
Capability 2: offload_snapshot
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: erika:/mnt/CommonBR/bd-meta
Brick1 VG: matias_uno
Brick2: xiomara:/mnt/CommonBR/bd-meta
Brick2 VG: matias_dos
Options Reconfigured:
cluster.server-quorum-type: none
cluster.quorum-type: auto
network.remote-dio: enable
cluster.eager-lock: enable
performance.stat-prefetch: off
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
server.allow-insecure: on
storage.owner-gid: 36
storage.owner-uid: 107
nfs.disable: on
performance.open-behind: off

Additional observation:
When mounting with '-o use-readdirp=off' the problem goes away.

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