[Bugs] [Bug 1469487] New: sys_xxx() functions should guard against bad return values from fs

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1469487

            Bug ID: 1469487
           Summary: sys_xxx() functions should guard against bad return
                    values from fs
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: pkarampu at redhat.com
                CC: bugs at gluster.org



Description of problem:
    Problem:
    FS sometimes doesn't give the expected return values. We need our common
    functions to guard against this.
    Example BUG: https://bugzilla.redhat.com/show_bug.cgi?id=864401

    Fix:
    When the return value is not as per specification, change the return value
    to -1 and errno to EIO


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