diff options
| author | Neil Brown <neilb@cse.unsw.edu.au> | 2005-01-04 05:51:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-01-04 05:51:07 -0800 |
| commit | 95402a16ada69cfd8180961a33540e8edfb63f05 (patch) | |
| tree | 8ba22f6e33478a7e48e724abc2a3a63eaba4b072 /fs | |
| parent | 0fe1a2eabab2d0fc1fb5c69326f6d809b194f28b (diff) | |
| download | history-95402a16ada69cfd8180961a33540e8edfb63f05.tar.gz | |
[PATCH] knfsd: helper functions for deciding to grant a delegation.
Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfsd/nfs4state.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 29f52bd05ef196..313acf87731983 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1504,6 +1504,43 @@ out: } static int +nfs4_deleg_conflict(u32 share, u32 dtype) +{ + return (((share & NFS4_SHARE_ACCESS_WRITE) && + dtype == NFS4_OPEN_DELEGATE_READ) || + ((share & NFS4_SHARE_ACCESS_READ) && + dtype == NFS4_OPEN_DELEGATE_WRITE)); +} + +#define DONT_DELEGATE 8 + +/* + * nfs4_check_deleg_recall() + * + * Test any delegation that is currently within an incompleted recalled + * state, and return NFSERR_DELAY for conflicting open share. + * flag is set to DONT_DELEGATE for shares that match the deleg type. + */ +static int +nfs4_check_deleg_recall(struct nfs4_file *fp, struct nfsd4_open *op, int *flag) +{ + struct nfs4_delegation *dp; + int status = 0; + + list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) { + dprintk("NFSD: found delegation %p with dl_state %d\n", + dp, atomic_read(&dp->dl_state)); + if (atomic_read(&dp->dl_state) == NFS4_RECALL_IN_PROGRESS) { + if(nfs4_deleg_conflict(op->op_share_access, dp->dl_type)) + status = nfserr_jukebox; + else + *flag = DONT_DELEGATE; + } + } + return status; +} + +static int nfs4_check_open(struct nfs4_file *fp, struct nfs4_stateowner *sop, struct nfsd4_open *open, struct nfs4_stateid **stpp) { struct nfs4_stateid *local; |