diff options
| author | Neil Brown <neilb@cse.unsw.edu.au> | 2005-01-04 05:51:20 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-01-04 05:51:20 -0800 |
| commit | a0e7d577db9c490289c8de7ab0ef19a00c328cf8 (patch) | |
| tree | e059a716e89f3e785f583e5ce392d6e2d9937b82 /fs | |
| parent | 95402a16ada69cfd8180961a33540e8edfb63f05 (diff) | |
| download | history-a0e7d577db9c490289c8de7ab0ef19a00c328cf8.tar.gz | |
[PATCH] knfsd: attempt to hand out 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 | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 313acf87731983..facbe9976dadd4 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1642,6 +1642,65 @@ nfs4_set_claim_prev(struct nfsd4_open *open, int *status) } /* + * Attempt to hand out a delegation. + */ +static void +nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp, int *flag) +{ + struct nfs4_delegation *dp; + struct nfs4_stateowner *sop = stp->st_stateowner; + struct nfs4_callback *cb = &sop->so_client->cl_callback; + struct file_lock fl, *flp = &fl; + int status; + + if (*flag == DONT_DELEGATE) { + *flag = NFS4_OPEN_DELEGATE_NONE; + return; + } + + /* set flag */ + *flag = NFS4_OPEN_DELEGATE_NONE; + if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL + || !atomic_read(&cb->cb_set) || !sop->so_confirmed) + return; + + if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) + *flag = NFS4_OPEN_DELEGATE_READ; + + else if (!(open->op_share_access & NFS4_SHARE_ACCESS_READ)) + *flag = NFS4_OPEN_DELEGATE_WRITE; + + if (!(dp = alloc_init_deleg(sop->so_client, stp->st_file, fh, *flag))) + return; + locks_init_lock(&fl); + fl.fl_lmops = &nfsd_lease_mng_ops; + fl.fl_flags = FL_LEASE; + fl.fl_end = OFFSET_MAX; + fl.fl_owner = (fl_owner_t)dp; + fl.fl_file = stp->st_vfs_file; + fl.fl_pid = current->tgid; + + if ((status = setlease(stp->st_vfs_file, + *flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) { + dprintk("NFSD: setlease failed [%d], no delegation\n", status); + list_del(&dp->dl_del_perfile); + list_del(&dp->dl_del_perclnt); + kfree(dp); + free_delegation++; + *flag = NFS4_OPEN_DELEGATE_NONE; + return; + } + + memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid)); + + dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n", + dp->dl_stateid.si_boot, + dp->dl_stateid.si_stateownerid, + dp->dl_stateid.si_fileid, + dp->dl_stateid.si_generation); +} + +/* * called with nfs4_lock_state() held. */ int |