nfsd: bypass readahead cache when have struct file

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The readahead cache compensates for the fact that the NFS server
currently does an open and close on every IO operation in the NFSv2 and
NFSv3 case.

In the NFSv4 case we have long-lived struct files associated with client
opens, so there's no need for this.  In fact, concurrent IO's using
trying to modify the same file->f_ra may cause problems.

So, don't bother with the readahead cache in that case.

Note eventually we'll likely do this in the v2/v3 case as well by
keeping a cache of struct files instead of struct file_ra_state's.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

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This commit is contained in:

J. Bruce Fields 2010-07-27 16:48:54 -04:00

parent af4718f3f9

commit fa0a21269f

1 changed files with 38 additions and 24 deletions

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fs/nfsd/vfs.c

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