nfsd4: separate delegreturn case from preprocess_stateid_op

Delegreturn is enough a special case for preprocess_stateid_op to
warrant just open-coding it in delegreturn.

There should be no change in behavior here; we're just reshuffling code.

Thanks to Yang Hongyang for catching a critical typo.

Reviewed-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index d555585..3570a0d 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2000,10 +2000,7 @@ out:
 static inline __be32
 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
 {
-       /* Trying to call delegreturn with a special stateid? Yuch: */
-       if (!(flags & (RD_STATE | WR_STATE)))
-               return nfserr_bad_stateid;
-       else if (ONE_STATEID(stateid) && (flags & RD_STATE))
+       if (ONE_STATEID(stateid) && (flags & RD_STATE))
                return nfs_ok;
        else if (locks_in_grace()) {
                /* Answer in remaining cases depends on existance of
@@ -2024,8 +2021,7 @@ check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
 static inline int
 io_during_grace_disallowed(struct inode *inode, int flags)
 {
-       return locks_in_grace() && (flags & (RD_STATE | WR_STATE))
-               && mandatory_lock(inode);
+       return locks_in_grace() && mandatory_lock(inode);
 }
 
 static int check_stateid_generation(stateid_t *in, stateid_t *ref)
@@ -2089,8 +2085,6 @@ nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int fl
                if (status)
                        goto out;
                renew_client(dp->dl_client);
-               if (flags & DELEG_RET)
-                       unhash_delegation(dp);
                if (filpp)
                        *filpp = dp->dl_vfs_file;
        } else { /* open or lock stateid */
@@ -2408,16 +2402,38 @@ __be32
 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                  struct nfsd4_delegreturn *dr)
 {
+       struct nfs4_delegation *dp;
+       stateid_t *stateid = &dr->dr_stateid;
+       struct inode *inode;
        __be32 status;
 
        if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
-               goto out;
+               return status;
+       inode = cstate->current_fh.fh_dentry->d_inode;
 
        nfs4_lock_state();
-       status = nfs4_preprocess_stateid_op(&cstate->current_fh,
-                                           &dr->dr_stateid, DELEG_RET, NULL);
-       nfs4_unlock_state();
+       status = nfserr_bad_stateid;
+       if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+               goto out;
+       status = nfserr_stale_stateid;
+       if (STALE_STATEID(stateid))
+               goto out;
+       status = nfs_ok;
+       if (!is_delegation_stateid(stateid))
+               goto out;
+       status = nfserr_bad_stateid;
+       dp = find_delegation_stateid(inode, stateid);
+       if (!dp)
+               goto out;
+       status = check_stateid_generation(stateid, &dp->dl_stateid);
+       if (status)
+               goto out;
+       renew_client(dp->dl_client);
+
+       unhash_delegation(dp);
 out:
+       nfs4_unlock_state();
+
        return status;
 }
 

diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 1130d53..c9311a1 100644 (file)
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -263,7 +263,6 @@ struct nfs4_stateid {
 #define RD_STATE               0x00000010
 #define WR_STATE               0x00000020
 #define CLOSE_STATE             0x00000040
-#define DELEG_RET               0x00000080
 
 #define seqid_mutating_err(err)                       \
        (((err) != nfserr_stale_clientid) &&    \