[Bugs] [Bug 1214289] I/O failure on attaching tier

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1214289



--- Comment #8 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/10435 committed in master by Kaleb KEITHLEY
(kkeithle at redhat.com) 
------
commit 377505a101eede8943f5a345e11a6901c4f8f420
Author: Dan Lambright <dlambrig at redhat.com>
Date:   Tue Apr 28 16:26:33 2015 -0400

    cluster/tier: don't use hot tier until subvolumes ready

    When we attach a tier, the hot tier becomes the hashed
    subvolume. But directories may not yet have been replicated by
    the fix layout process. Hence lookups to those directories
    will fail on the hot subvolume. We should only go to the hashed
    subvolume once the layout has been fixed. This is known if the
    layout for the parent directory does not have an error. If
    there is an error, the cold tier is considered the hashed
    subvolume. The exception to this rules is ENOCON, in which
    case we do not know where the file is and must abort.

    Note we may revalidate a lookup for a directory even if the
    inode has not yet been populated by FUSE. This case can
    happen in tiering (where one tier has completed a lookup
    but the other has not, in which case we revalidate one tier
    when we call lookup the second time). Such inodes are
    still invalid and should not be consulted for validation.

    Change-Id: Ia2bc62e1d807bd70590bd2a8300496264d73c523
    BUG: 1214289
    Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    Reviewed-on: http://review.gluster.org/10435
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Raghavendra G <rgowdapp at redhat.com>
    Reviewed-by: N Balachandran <nbalacha at redhat.com>

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