From: NeilBrown Allow recovery of delegations after reboot. Signed-off-by: J. Bruce Fields Signed-off-by: Neil Brown Signed-off-by: Andrew Morton --- fs/nfsd/nfs4state.c | 36 ++++++++++++++++++++++++++++-------- fs/nfsd/nfs4xdr.c | 2 +- include/linux/nfsd/xdr4.h | 1 + 3 files changed, 30 insertions(+), 9 deletions(-) diff -puN fs/nfsd/nfs4state.c~nfsd4-delegation-recovery fs/nfsd/nfs4state.c --- 25/fs/nfsd/nfs4state.c~nfsd4-delegation-recovery Thu Jun 2 16:25:00 2005 +++ 25-akpm/fs/nfsd/nfs4state.c Thu Jun 2 16:25:00 2005 @@ -1709,14 +1709,30 @@ nfs4_open_delegation(struct svc_fh *fh, int status, flag = 0; flag = NFS4_OPEN_DELEGATE_NONE; - if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL - || !atomic_read(&cb->cb_set) || !sop->so_confirmed) - goto out; - - if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) - flag = NFS4_OPEN_DELEGATE_WRITE; - else - flag = NFS4_OPEN_DELEGATE_READ; + open->op_recall = 0; + switch (open->op_claim_type) { + case NFS4_OPEN_CLAIM_PREVIOUS: + if (!atomic_read(&cb->cb_set)) + open->op_recall = 1; + flag = open->op_delegate_type; + if (flag == NFS4_OPEN_DELEGATE_NONE) + goto out; + break; + case NFS4_OPEN_CLAIM_NULL: + /* Let's not give out any delegations till everyone's + * had the chance to reclaim theirs.... */ + if (nfs4_in_grace()) + goto out; + if (!atomic_read(&cb->cb_set) || !sop->so_confirmed) + goto out; + if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) + flag = NFS4_OPEN_DELEGATE_WRITE; + else + flag = NFS4_OPEN_DELEGATE_READ; + break; + default: + goto out; + } dp = alloc_init_deleg(sop->so_client, stp, fh, flag); if (dp == NULL) { @@ -1750,6 +1766,10 @@ nfs4_open_delegation(struct svc_fh *fh, dp->dl_stateid.si_fileid, dp->dl_stateid.si_generation); out: + if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS + && flag == NFS4_OPEN_DELEGATE_NONE + && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) + printk("NFSD: WARNING: refusing delegation reclaim\n"); open->op_delegate_type = flag; } diff -puN fs/nfsd/nfs4xdr.c~nfsd4-delegation-recovery fs/nfsd/nfs4xdr.c --- 25/fs/nfsd/nfs4xdr.c~nfsd4-delegation-recovery Thu Jun 2 16:25:00 2005 +++ 25-akpm/fs/nfsd/nfs4xdr.c Thu Jun 2 16:25:00 2005 @@ -1972,7 +1972,7 @@ nfsd4_encode_open(struct nfsd4_compoundr case NFS4_OPEN_DELEGATE_READ: RESERVE_SPACE(20 + sizeof(stateid_t)); WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t)); - WRITE32(0); + WRITE32(open->op_recall); /* * TODO: ACE's in delegations diff -puN include/linux/nfsd/xdr4.h~nfsd4-delegation-recovery include/linux/nfsd/xdr4.h --- 25/include/linux/nfsd/xdr4.h~nfsd4-delegation-recovery Thu Jun 2 16:25:00 2005 +++ 25-akpm/include/linux/nfsd/xdr4.h Thu Jun 2 16:25:00 2005 @@ -210,6 +210,7 @@ struct nfsd4_open { u32 op_share_access; /* request */ u32 op_share_deny; /* request */ stateid_t op_stateid; /* response */ + u32 op_recall; /* recall */ struct nfsd4_change_info op_cinfo; /* response */ u32 op_rflags; /* response */ int op_truncate; /* used during processing */ _