[Bugs] [Bug 1343838] New: Implement API to get page aligned iobufs in iobuf.c

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1343838

            Bug ID: 1343838
           Summary: Implement API to get page aligned iobufs in iobuf.c
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: kdhananj at redhat.com
                CC: bugs at gluster.org



Description of problem:

One of the consumers of a page aligned buffer would be posix's readv fop on
O_DIRECT fds. Today the way it works is by getting a page-aligned buffer
through calloc, pread()ing into this buffer and then copying its contents into
a newly created iobuf's ptr. This results in an extra memcpy() which can be
avoided if we could implement an api that would return an iobuf whose ptr is
mem-aligned. That way the iobuf->ptr can be directly passed to sys_preadv() as
a parameter by posix translator.


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