NFSD: Add an NFSD_FILE_GC flag to enable nfsd_file garbage collection

NFSv4 operations manage the lifetime of nfsd_file items they use by
means of NFSv4 OPEN and CLOSE. Hence there's no need for them to be
garbage collected.

Introduce a mechanism to enable garbage collection for nfsd_file
items used only by NFSv2/3 callers.

Note that the change in nfsd_file_put() ensures that both CLOSE and
DELEGRETURN will actually close out and free an nfsd_file on last
reference of a non-garbage-collected file.

Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=394
Suggested-by: Trond Myklebust <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>
Tested-by: Jeff Layton <[email protected]>
Reviewed-by: NeilBrown <[email protected]>
Reviewed-by: Jeff Layton <[email protected]>

0 files changed, 0 insertions, 0 deletions