[Bugs] [Bug 1375959] Files not being opened with o_direct flag during random read operation ( Glusterfs 3.8.2)

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1375959



--- Comment #12 from Shekhar Berry <shberry at redhat.com> ---
I stand corrected. With 'Open-behind' off I am seeing files are now open with
o_direct flag for both write and read test.

I redid the test with following volume setting:

performance.open-behind: off
performance.strict-o-direct: on

Here's the strace output:

grep -i "o_direct" strace.log.* | egrep -v openat

strace.log.25363:open("/bricks/b01/g/.glusterfs/ab/2e/ab2ea2ca-1f6e-494a-b817-faec8627afe3",
O_RDWR|O_DIRECT) = 33 <0.000014>
strace.log.25363:open("/bricks/b01/g/.glusterfs/10/f7/10f7cf7d-bd68-4414-a3c8-cb3b12092452",
O_RDWR|O_DIRECT) = 35 <0.000016>
strace.log.25363:open("/bricks/b01/g/.glusterfs/51/ac/51acd630-6518-42f8-a9cf-c936dc5c3b9c",
O_RDWR|O_DIRECT) = 37 <0.000011>
strace.log.25363:open("/bricks/b01/g/.glusterfs/a1/41/a141600d-8fbb-41f9-b0b8-34318125839e",
O_RDWR|O_DIRECT) = 39 <0.000017>
strace.log.25363:open("/bricks/b01/g/.glusterfs/fa/cd/facda6a3-53c4-484e-a599-2488d0683c31",
O_RDWR|O_DIRECT) = 43 <0.000039>
strace.log.25363:open("/bricks/b01/g/.glusterfs/52/02/5202698e-51d2-40d3-9a61-9b40ce2b427b",
O_RDWR|O_DIRECT) = 44 <0.000014>
strace.log.25363:open("/bricks/b01/g/.glusterfs/ac/2c/ac2ceda0-d035-4b94-87bc-c12bced59c6c",
O_RDONLY|O_DIRECT) = 45 <0.000040>
strace.log.25363:open("/bricks/b01/g/.glusterfs/51/ac/51acd630-6518-42f8-a9cf-c936dc5c3b9c",
O_RDONLY|O_DIRECT) = 52 <0.000021>
strace.log.25454:open("/bricks/b01/g/.glusterfs/ca/47/ca475b51-9f61-4838-ba2c-8930b65a0c04",
O_RDWR|O_DIRECT) = 34 <0.000019>
strace.log.25454:open("/bricks/b01/g/.glusterfs/11/d7/11d7083f-a4d0-41c2-9b48-efbd899b831a",
O_RDWR|O_DIRECT) = 36 <0.000017>
strace.log.25454:open("/bricks/b01/g/.glusterfs/84/63/8463c0d7-3e68-44c7-b360-0a6622070c42",
O_RDWR|O_DIRECT) = 38 <0.000017>
strace.log.25454:open("/bricks/b01/g/.glusterfs/9a/4c/9a4cb41f-487d-464f-9238-9db7385ecf53",
O_RDWR|O_DIRECT) = 40 <0.000012>
strace.log.25454:open("/bricks/b01/g/.glusterfs/30/f9/30f929ce-9b66-4d3e-ab0f-a73c60d4d817",
O_RDWR|O_DIRECT) = 41 <0.000013>
strace.log.25454:open("/bricks/b01/g/.glusterfs/85/50/8550a796-172b-4390-b976-b228eafd9ada",
O_RDWR|O_DIRECT) = 42 <0.000016>
strace.log.25454:open("/bricks/b01/g/.glusterfs/9d/b2/9db21c69-39bc-4565-8793-0833cf21887d",
O_RDWR|O_DIRECT) = 45 <0.000020>
strace.log.25454:open("/bricks/b01/g/.glusterfs/ac/2c/ac2ceda0-d035-4b94-87bc-c12bced59c6c",
O_RDWR|O_DIRECT) = 48 <0.000026>
strace.log.25454:open("/bricks/b01/g/.glusterfs/a5/b6/a5b62db9-0d1a-49cb-b188-a1be216de017",
O_RDWR|O_DIRECT) = 50 <0.000021>
strace.log.25454:open("/bricks/b01/g/.glusterfs/c1/fb/c1fb470d-63dc-4d1e-8079-93877bdcb2a5",
O_RDONLY|O_DIRECT) = 36 <0.000026>
strace.log.25454:open("/bricks/b01/g/.glusterfs/11/d7/11d7083f-a4d0-41c2-9b48-efbd899b831a",
O_RDONLY|O_DIRECT) = 48 <0.000030>
strace.log.25455:open("/bricks/b01/g/.glusterfs/81/04/810408fe-eb40-42e3-b53b-981dbf290af3",
O_RDWR|O_DIRECT) = 49 <0.000037>
strace.log.25455:open("/bricks/b01/g/.glusterfs/c1/fb/c1fb470d-63dc-4d1e-8079-93877bdcb2a5",
O_RDWR|O_DIRECT) = 52 <0.000013>
strace.log.25455:open("/bricks/b01/g/.glusterfs/30/f9/30f929ce-9b66-4d3e-ab0f-a73c60d4d817",
O_RDONLY|O_DIRECT) = 33 <0.000022>
strace.log.25455:open("/bricks/b01/g/.glusterfs/9d/b2/9db21c69-39bc-4565-8793-0833cf21887d",
O_RDONLY|O_DIRECT) = 35 <0.000032>
strace.log.25455:open("/bricks/b01/g/.glusterfs/84/63/8463c0d7-3e68-44c7-b360-0a6622070c42",
O_RDONLY|O_DIRECT) = 49 <0.000027>
strace.log.25456:open("/bricks/b01/g/.glusterfs/2d/35/2d352297-ab44-4c92-8b1d-cb314f5f693b",
O_RDWR|O_DIRECT) = 51 <0.000029>
strace.log.25456:open("/bricks/b01/g/.glusterfs/fa/cd/facda6a3-53c4-484e-a599-2488d0683c31",
O_RDONLY|O_DIRECT) = 34 <0.000029>
strace.log.25457:open("/bricks/b01/g/.glusterfs/e5/13/e5134455-eb71-43b8-8662-355c79d5ef1a",
O_RDWR|O_DIRECT) = 46 <0.000018>
strace.log.25457:open("/bricks/b01/g/.glusterfs/49/3b/493b7a5b-42f7-4c0a-9a4c-48956a05444f",
O_RDWR|O_DIRECT) = 47 <0.000027>
strace.log.25457:open("/bricks/b01/g/.glusterfs/81/04/810408fe-eb40-42e3-b53b-981dbf290af3",
O_RDONLY|O_DIRECT) = 47 <0.000031>
strace.log.25458:open("/bricks/b01/g/.glusterfs/52/02/5202698e-51d2-40d3-9a61-9b40ce2b427b",
O_RDONLY|O_DIRECT) = 39 <0.000026>
strace.log.25458:open("/bricks/b01/g/.glusterfs/ab/2e/ab2ea2ca-1f6e-494a-b817-faec8627afe3",
O_RDONLY|O_DIRECT) = 46 <0.000037>
strace.log.25458:open("/bricks/b01/g/.glusterfs/ca/47/ca475b51-9f61-4838-ba2c-8930b65a0c04",
O_RDONLY|O_DIRECT) = 51 <0.000030>
strace.log.25459:open("/bricks/b01/g/.glusterfs/e5/13/e5134455-eb71-43b8-8662-355c79d5ef1a",
O_RDONLY|O_DIRECT) = 40 <0.000017>
strace.log.25459:open("/bricks/b01/g/.glusterfs/10/f7/10f7cf7d-bd68-4414-a3c8-cb3b12092452",
O_RDONLY|O_DIRECT) = 42 <0.000014>
strace.log.25459:open("/bricks/b01/g/.glusterfs/49/3b/493b7a5b-42f7-4c0a-9a4c-48956a05444f",
O_RDONLY|O_DIRECT) = 43 <0.000044>
strace.log.25460:open("/bricks/b01/g/.glusterfs/85/50/8550a796-172b-4390-b976-b228eafd9ada",
O_RDONLY|O_DIRECT) = 37 <0.000012>
strace.log.25461:open("/bricks/b01/g/.glusterfs/a5/b6/a5b62db9-0d1a-49cb-b188-a1be216de017",
O_RDONLY|O_DIRECT) = 38 <0.000039>
strace.log.25461:open("/bricks/b01/g/.glusterfs/9a/4c/9a4cb41f-487d-464f-9238-9db7385ecf53",
O_RDONLY|O_DIRECT) = 44 <0.000027>
strace.log.25461:open("/bricks/b01/g/.glusterfs/a1/41/a141600d-8fbb-41f9-b0b8-34318125839e",
O_RDONLY|O_DIRECT) = 50 <0.000015>
strace.log.25462:open("/bricks/b01/g/.glusterfs/2d/35/2d352297-ab44-4c92-8b1d-cb314f5f693b",
O_RDONLY|O_DIRECT) = 41 <0.000017>


--Shekhar

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