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Go Back   Linux Archive > Redhat > Cluster Development

 
 
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Old 11-16-2011, 07:42 AM
Christoph Hellwig
 
Default fallocate vs O_(D)SYNC

It seems all filesystems but XFS ignore O_SYNC for fallocate, and never
make sure the size update transaction made it to disk.

Given that a fallocate without FALLOC_FL_KEEP_SIZE very much is a data
operation (it adds new blocks that return zeroes) that seems like a
fairly nasty surprise for O_SYNC users.
 

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