Re: mmap over nfs leads to excessive system load

[Chuck Lever <cel@citi.umich.edu>]

Trond Myklebust wrote:
> I had a quick look at nfs_file_direct_write(), and among other things,
> it would appear that it is not doing any of the usual overflow checks on
> *pos and the count size (see generic_write_checks()). In particular,
> checks are missing against overflow vs. MAX_NON_LFS if O_LARGEFILE is
> not set (and also against overflow vs. s_maxbytes, but that is less
> relevant here).

the architecture is to allow the NFS protocol and server to do these checks.

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