This adds i_seqcnt to inode structure and then uses i_size_read() and
i_size_write() to provide atomic access to i_size. This is port
of Andrea Arcangeli i_size atomic access patch from 2.4. This only
uses the generic reader/writer consistent mechanism.
re-diff against 2.5.65 and removed the extra printk() :)
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Daniel McNeil <[email protected]>