Re: [PATCH 1/2] vfs: replace i_readcount with a biased i_count

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On Wed, Jun 12, 2019 at 06:09:59PM +0300, Amir Goldstein wrote:
> But if I am following Miklos' suggestion to make i_count 64bit, inode
> struct size is going to grow for 32bit arch when  CONFIG_IMA is not
> defined, so to reduce impact, I will keep i_readcount as a separate
> member and let it be defined also when BITS_PER_LONG == 64
> and implement inode_is_open_rdonly() using d_count and i_count
> when i_readcount is not defined.

How bad would it be just to let the inode be a little bigger?  How big
is it already on 32 bit architectures?  How much does this change e.g.
how many inodes you can cache per megabyte?

--b.



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