[Bugs] [Bug 1399450] Backport few of the md-cache enhancements from master to 3.9

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1399450



--- Comment #9 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: http://review.gluster.org/15959 committed in release-3.9 by Pranith
Kumar Karampuri (pkarampu at redhat.com) 
------
commit 18ac64b083bde041b9a3011224f067966721668a
Author: Poornima G <pgurusid at redhat.com>
Date:   Mon Nov 21 11:49:35 2016 +0530

    afr: Fix the EIO that can occur in afr_inode_refresh as a result
         of cache invalidation(upcall).

    Issue:
    ------
    When a cache invalidation is recieved as a result of changing
    pending xattr, the read_subvol is reset. Consider the below chain
    of execution:

    CHILD_DOWN
    ...
    afr_readv
    ...
    afr_inode_refresh
    ...
    afr_inode_read_subvol_reset <- as a result of pending xattr set by
                                   some other client GF_EVENT_UPCALL will
                                   be sent
    afr_refresh_done -> this results in an EIO, as the read subvol was
                        reset by the end of the afr_inode_refresh

    Solution:
    ---------
    When GF_EVENT_UPCALL is recieved, instead of resetting read_subvol,
    set a variable need_refresh in inode_ctx, the next time some one
    starts a txn, along with event gen, need_rrefresh also needs to
    be checked.

    >Reviewed-on: http://review.gluster.org/15892
    >Reviewed-by: Ravishankar N <ravishankar at redhat.com>
    >Smoke: Gluster Build System <jenkins at build.gluster.org>
    >NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    >CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    >Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>
    >Signed-off-by: Poornima G <pgurusid at redhat.com>

    Change-Id: Ifda21a7a8039b8874215e1afa4bdf20f7d991b58
    BUG: 1399450
    Signed-off-by: Poornima G <pgurusid at redhat.com>
    Reviewed-on: http://review.gluster.org/15959
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Ravishankar N <ravishankar at redhat.com>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>

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