From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 13603] New: Fallocate and DirectIO
Date: Mon, 22 Jun 2009 16:47:18 GMT
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http://bugzilla.kernel.org/show_bug.cgi?id=13603

           Summary: Fallocate and DirectIO
           Product: File System
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: aneesh.kumar@linux.vnet.ibm.com
        Regression: No


Have a kernel.org bugzilla entry to track the bug.

http://article.gmane.org/gmane.comp.file-systems.ext4/13762

I noticed yesterday that a write to fallocate
space via directIO results in fallback to buffer_IO. ie the userspace
pages get copied to the page cache and then call a sync.

I guess this defeat the purpose of using directIO. May be we should
consider this a high priority bug.

-aneesh

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