nfsd: serialize layout stateid morphing operations
In order to allow the client to make a sane determination of what
happened with racing LAYOUTGET/LAYOUTRETURN/CB_LAYOUTRECALL calls, we
must ensure that the seqids return accurately represent the order of
operations. The simplest way to do that is to ensure that operations on
a single stateid are serialized.
This patch adds a mutex to the layout stateid, and locks it when
checking the layout stateid's seqid. The mutex is held over the entire
operation and released after the seqid is bumped.
Note that in the case of CB_LAYOUTRECALL we must move the increment of
the seqid and setting into a new cb "prepare" operation. The lease
infrastructure will call the lm_break callback with a spinlock held, so
and we can't take the mutex in that codepath.
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c
index ebf90e4..4a68ab9 100644
--- a/fs/nfsd/nfs4layouts.c
+++ b/fs/nfsd/nfs4layouts.c
@@ -201,6 +201,7 @@
INIT_LIST_HEAD(&ls->ls_perfile);
spin_lock_init(&ls->ls_lock);
INIT_LIST_HEAD(&ls->ls_layouts);
+ mutex_init(&ls->ls_mutex);
ls->ls_layout_type = layout_type;
nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
NFSPROC4_CLNT_CB_LAYOUT);
@@ -262,19 +263,23 @@
status = nfserr_jukebox;
if (!ls)
goto out;
+ mutex_lock(&ls->ls_mutex);
} else {
ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
status = nfserr_bad_stateid;
+ mutex_lock(&ls->ls_mutex);
if (stateid->si_generation > stid->sc_stateid.si_generation)
- goto out_put_stid;
+ goto out_unlock_stid;
if (layout_type != ls->ls_layout_type)
- goto out_put_stid;
+ goto out_unlock_stid;
}
*lsp = ls;
return 0;
+out_unlock_stid:
+ mutex_unlock(&ls->ls_mutex);
out_put_stid:
nfs4_put_stid(stid);
out:
@@ -296,8 +301,6 @@
trace_layout_recall(&ls->ls_stid.sc_stateid);
atomic_inc(&ls->ls_stid.sc_count);
- update_stateid(&ls->ls_stid.sc_stateid);
- memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
nfsd4_run_cb(&ls->ls_recall);
out_unlock:
@@ -494,6 +497,7 @@
}
spin_unlock(&ls->ls_lock);
+ mutex_unlock(&ls->ls_mutex);
nfs4_put_stid(&ls->ls_stid);
nfsd4_free_layouts(&reaplist);
return nfs_ok;
@@ -608,6 +612,17 @@
}
}
+static void
+nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
+{
+ struct nfs4_layout_stateid *ls =
+ container_of(cb, struct nfs4_layout_stateid, ls_recall);
+
+ mutex_lock(&ls->ls_mutex);
+ update_stateid(&ls->ls_stid.sc_stateid);
+ memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
+}
+
static int
nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
{
@@ -649,12 +664,14 @@
trace_layout_recall_release(&ls->ls_stid.sc_stateid);
+ mutex_unlock(&ls->ls_mutex);
nfsd4_return_all_layouts(ls, &reaplist);
nfsd4_free_layouts(&reaplist);
nfs4_put_stid(&ls->ls_stid);
}
static struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
+ .prepare = nfsd4_cb_layout_prepare,
.done = nfsd4_cb_layout_done,
.release = nfsd4_cb_layout_release,
};
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 4ce6b97..a9f096c 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1309,6 +1309,7 @@
nfserr = nfsd4_insert_layout(lgp, ls);
out_put_stid:
+ mutex_unlock(&ls->ls_mutex);
nfs4_put_stid(&ls->ls_stid);
out:
return nfserr;
@@ -1362,6 +1363,9 @@
goto out;
}
+ /* LAYOUTCOMMIT does not require any serialization */
+ mutex_unlock(&ls->ls_mutex);
+
if (new_size > i_size_read(inode)) {
lcp->lc_size_chg = 1;
lcp->lc_newsize = new_size;
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 31bde12..1fa0f38 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -562,6 +562,7 @@
struct nfsd4_callback ls_recall;
stateid_t ls_recall_sid;
bool ls_recalled;
+ struct mutex ls_mutex;
};
static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)
