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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-03-08 17:42:01 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-03-08 22:38:55 -0500
commit4fc8796d23819da814ec25b7793bde8f104f1a2a (patch)
treed86513109dd792087091b6054a983271b2536f60
parent0032a7a749a49b2c044092a1d0af5cfd0077f35d (diff)
downloadlinux-stericsson-4fc8796d23819da814ec25b7793bde8f104f1a2a.tar.gz
NFSv4: Clean up nfs4_select_rw_stateid()
Ensure that we select delegation stateids first, then lock stateids and then open stateids. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/nfs4_fs.h3
-rw-r--r--fs/nfs/nfs4proc.c8
-rw-r--r--fs/nfs/nfs4state.c45
-rw-r--r--fs/nfs/nfs4xdr.c13
4 files changed, 49 insertions, 20 deletions
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index d1989e3f23c3..b47bdb9c1612 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -330,7 +330,8 @@ extern void nfs41_handle_server_scope(struct nfs_client *,
struct server_scope **);
extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
-extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t, pid_t);
+extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
+ fmode_t, fl_owner_t, pid_t);
extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3578ad36a5b8..3bf5593741ee 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1929,10 +1929,12 @@ static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
nfs_fattr_init(fattr);
- if (nfs4_copy_delegation_stateid(&arg.stateid, inode, FMODE_WRITE)) {
+ if (state != NULL) {
+ nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
+ current->files, current->tgid);
+ } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
+ FMODE_WRITE)) {
/* Use that stateid */
- } else if (state != NULL) {
- nfs4_select_rw_stateid(&arg.stateid, state, current->files, current->tgid);
} else
nfs4_stateid_copy(&arg.stateid, &zero_stateid);
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 7adc46b4c7f8..de44804d9864 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -886,28 +886,49 @@ int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
return 0;
}
-/*
- * Byte-range lock aware utility to initialize the stateid of read/write
- * requests.
- */
-void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
+static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
+ fl_owner_t fl_owner, pid_t fl_pid)
{
struct nfs4_lock_state *lsp;
- int seq;
+ bool ret = false;
- do {
- seq = read_seqbegin(&state->seqlock);
- nfs4_stateid_copy(dst, &state->stateid);
- } while (read_seqretry(&state->seqlock, seq));
if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
- return;
+ goto out;
spin_lock(&state->state_lock);
lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
- if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
+ if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
nfs4_stateid_copy(dst, &lsp->ls_stateid);
+ ret = true;
+ }
spin_unlock(&state->state_lock);
nfs4_put_lock_state(lsp);
+out:
+ return ret;
+}
+
+static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
+{
+ int seq;
+
+ do {
+ seq = read_seqbegin(&state->seqlock);
+ nfs4_stateid_copy(dst, &state->stateid);
+ } while (read_seqretry(&state->seqlock, seq));
+}
+
+/*
+ * Byte-range lock aware utility to initialize the stateid of read/write
+ * requests.
+ */
+void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
+ fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid)
+{
+ if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
+ return;
+ if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid))
+ return;
+ nfs4_copy_open_stateid(dst, state);
}
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index e4bb8e6409a7..f7e064d997f6 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1491,12 +1491,17 @@ static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
}
-static void encode_open_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx, const struct nfs_lock_context *l_ctx, int zero_seqid)
+static void encode_open_stateid(struct xdr_stream *xdr,
+ const struct nfs_open_context *ctx,
+ const struct nfs_lock_context *l_ctx,
+ fmode_t fmode,
+ int zero_seqid)
{
nfs4_stateid stateid;
if (ctx->state != NULL) {
- nfs4_select_rw_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
+ nfs4_select_rw_stateid(&stateid, ctx->state,
+ fmode, l_ctx->lockowner, l_ctx->pid);
if (zero_seqid)
stateid.seqid = 0;
encode_nfs4_stateid(xdr, &stateid);
@@ -1510,7 +1515,7 @@ static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args,
encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
encode_open_stateid(xdr, args->context, args->lock_context,
- hdr->minorversion);
+ FMODE_READ, hdr->minorversion);
p = reserve_space(xdr, 12);
p = xdr_encode_hyper(p, args->offset);
@@ -1648,7 +1653,7 @@ static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *arg
encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
encode_open_stateid(xdr, args->context, args->lock_context,
- hdr->minorversion);
+ FMODE_WRITE, hdr->minorversion);
p = reserve_space(xdr, 16);
p = xdr_encode_hyper(p, args->offset);