blktrace: avoid using timespec

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The blktrace code stores the current time in a 32-bit word in its
user interface. This is a bad idea because 32-bit seconds overflow
at some point.

We probably have until 2106 before this one overflows, as it seems
to use an 'unsigned' variable, but we should confirm that user
space treats it the same way.

Aside from this, we want to stop using 'struct timespec' here,
so I'm adding a comment about the overflow and change the code
to use timespec64 instead to make the loss of range more obvious.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Arnd Bergmann 2016-06-17 16:58:26 +02:00 • committed by Jens Axboe

parent e1f3b9412e

commit 59a37f8bae

1 changed files with 4 additions and 3 deletions

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kernel/trace/blktrace.c

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