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Fixing the unfixable autofs ABIFixing the unfixable autofs ABIPosted May 1, 2012 0:55 UTC (Tue) by corbet (editor, #1)In reply to: Fixing the unfixable autofs ABI by hamjudo Parent article: Fixing the unfixable autofs ABI Almost. The kernel side always turns on packetized behavior so that things work as expected with all known user-space binaries.
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Fixing the unfixable autofs ABI Posted May 1, 2012 15:08 UTC (Tue) by ewan (subscriber, #5533) [Link]
I'm sure I'm being dense, but when the article says "Linus made an open with O_DIRECT turn on the packetized behavior" surely that rather implies that it's off unless you use O_DIRECT?
Fixing the unfixable autofs ABI Posted May 1, 2012 15:38 UTC (Tue) by hamjudo (subscriber, #363) [Link] It is off unless, something turns on O_DIRECT. The kernel side of the autofs interface turns on O_DIRECT. As far as I know, it isn't turned on anywhere else in the kernel (yet).Nothing, but common sense, prevents users from writing programs that use this feature.
Fixing the unfixable autofs ABI Posted May 1, 2012 15:41 UTC (Tue) by juliank (subscriber, #45896) [Link]
As far as I understand it, if you create such a a pipe yourself, then you use O_DIRECT; and for autofs, the kernel creates such a pipe itself and you thus automatically get that.
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