Messages in this thread | | | Date | Fri, 8 Sep 2017 11:39:13 -0400 | From | Theodore Ts'o <> | Subject | Re: [PATCH 0/9] add ext4 per-inode DAX flag |
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On Fri, Sep 08, 2017 at 09:25:43AM +1000, Dave Chinner wrote: > > Okay, so other ideas (which you have also probably already though of) include: > > > > 1) Just return -EBUSY if anyone tries to change the DAX flag of an inode with > > open mappings or any open file handles. > > You have to have an open fd to change the flag. :)
What if we only allow the S_DAX flag to be *set*, when i_size and i_blocks is zero? We could also require that only one file descriptor be open against the inode, and that it be opened O_RDONLY.
- Ted
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