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nfsd41: sanity check client drc maxreqs

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Ensure the client requested maximum requests are between 1 and
NFSD_MAX_SLOTS_PER_SESSION

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Andy Adamson 2009-06-16 04:19:38 +03:00 committed by J. Bruce Fields
parent 6c18ba9f5e
commit 5d77ddfbcb
1 changed files with 5 additions and 0 deletions
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5
fs/nfsd/nfs4state.c
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@ -425,6 +425,11 @@ static int set_forechannel_maxreqs(struct nfsd4_channel_attrs *fchan)
{ {
int status = 0, np = fchan->maxreqs * NFSD_PAGES_PER_SLOT; int status = 0, np = fchan->maxreqs * NFSD_PAGES_PER_SLOT;
if (fchan->maxreqs < 1)
return nfserr_inval;
else if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
spin_lock(&nfsd_serv->sv_lock); spin_lock(&nfsd_serv->sv_lock);
if (np + nfsd_serv->sv_drc_pages_used > nfsd_serv->sv_drc_max_pages) if (np + nfsd_serv->sv_drc_pages_used > nfsd_serv->sv_drc_max_pages)
np = nfsd_serv->sv_drc_max_pages - nfsd_serv->sv_drc_pages_used; np = nfsd_serv->sv_drc_max_pages - nfsd_serv->sv_drc_pages_used;