nfsd4: maintain one seqid stream per (lockowner, file)
Instead of creating a new lockowner and stateid for every
open_to_lockowner call, reuse the existing lockowner if it exists.
Reported-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 9354ddeb..d09d524 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3905,6 +3905,37 @@
__set_bit(access, &lock_stp->st_access_bmap);
}
+__be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
+{
+ struct nfs4_file *fi = ost->st_file;
+ struct nfs4_openowner *oo = openowner(ost->st_stateowner);
+ struct nfs4_client *cl = oo->oo_owner.so_client;
+ struct nfs4_lockowner *lo;
+ unsigned int strhashval;
+
+ lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
+ if (lo) {
+ if (!cstate->minorversion)
+ return nfserr_bad_seqid;
+ /* XXX: a lockowner always has exactly one stateid: */
+ *lst = list_first_entry(&lo->lo_owner.so_stateids,
+ struct nfs4_ol_stateid, st_perstateowner);
+ return nfs_ok;
+ }
+ strhashval = lock_ownerstr_hashval(fi->fi_inode, cl->cl_clientid.cl_id,
+ &lock->v.new.owner);
+ lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
+ if (lo == NULL)
+ return nfserr_jukebox;
+ *lst = alloc_init_lock_stateid(lo, fi, ost);
+ if (*lst == NULL) {
+ release_lockowner(lo);
+ return nfserr_jukebox;
+ }
+ *new = true;
+ return nfs_ok;
+}
+
/*
* LOCK operation
*/
@@ -3920,7 +3951,7 @@
struct file_lock file_lock;
struct file_lock conflock;
__be32 status = 0;
- unsigned int strhashval;
+ bool new_state = false;
int lkflg;
int err;
@@ -3969,21 +4000,9 @@
if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
&lock->v.new.clientid))
goto out;
- /* create lockowner and lock stateid */
- fp = open_stp->st_file;
- strhashval = lock_ownerstr_hashval(fp->fi_inode,
- open_sop->oo_owner.so_client->cl_clientid.cl_id,
- &lock->v.new.owner);
- /* XXX: Do we need to check for duplicate stateowners on
- * the same file, or should they just be allowed (and
- * create new stateids)? */
- status = nfserr_jukebox;
- lock_sop = alloc_init_lock_stateowner(strhashval,
- open_sop->oo_owner.so_client, open_stp, lock);
- if (lock_sop == NULL)
- goto out;
- lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
- if (lock_stp == NULL)
+ status = lookup_or_create_lock_state(cstate, open_stp, lock,
+ &lock_stp, &new_state);
+ if (status)
goto out;
} else {
/* lock (lock owner + lock stateid) already exists */
@@ -3993,10 +4012,9 @@
NFS4_LOCK_STID, &lock_stp);
if (status)
goto out;
- lock_sop = lockowner(lock_stp->st_stateowner);
- fp = lock_stp->st_file;
}
- /* lock_sop and lock_stp have been created or found */
+ lock_sop = lockowner(lock_stp->st_stateowner);
+ fp = lock_stp->st_file;
lkflg = setlkflg(lock->lk_type);
status = nfs4_check_openmode(lock_stp, lkflg);
@@ -4071,7 +4089,7 @@
break;
}
out:
- if (status && lock->lk_is_new && lock_sop)
+ if (status && new_state)
release_lockowner(lock_sop);
if (!cstate->replay_owner)
nfs4_unlock_state();