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-rw-r--r--fs/nfs/nfs4_fs.h4
-rw-r--r--fs/nfs/nfs4proc.c64
-rw-r--r--fs/nfs/nfs4state.c32
3 files changed, 86 insertions, 14 deletions
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 8309e98..627a74f 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -234,7 +234,7 @@ extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr
extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
extern int nfs4_release_lockowner(struct nfs4_lock_state *);
extern const struct xattr_handler *nfs4_xattr_handlers[];
-extern void nfs4_set_rw_stateid(nfs4_stateid *stateid,
+extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
const struct nfs_open_context *ctx,
const struct nfs_lock_context *l_ctx,
fmode_t fmode);
@@ -358,7 +358,7 @@ extern void nfs41_handle_server_scope(struct nfs_client *,
struct nfs41_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 *,
+extern int nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
fmode_t, const struct nfs_lockowner *);
extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 26176ce..6ad0612 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3454,7 +3454,7 @@ static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
return err;
}
-void nfs4_set_rw_stateid(nfs4_stateid *stateid,
+int nfs4_set_rw_stateid(nfs4_stateid *stateid,
const struct nfs_open_context *ctx,
const struct nfs_lock_context *l_ctx,
fmode_t fmode)
@@ -3463,10 +3463,37 @@ void nfs4_set_rw_stateid(nfs4_stateid *stateid,
if (l_ctx != NULL)
lockowner = &l_ctx->lockowner;
- nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
+ return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
}
EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
+static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
+ const struct nfs_open_context *ctx,
+ const struct nfs_lock_context *l_ctx,
+ fmode_t fmode)
+{
+ nfs4_stateid current_stateid;
+
+ if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
+ return false;
+ return nfs4_stateid_match(stateid, &current_stateid);
+}
+
+static bool nfs4_error_stateid_expired(int err)
+{
+ switch (err) {
+ case -NFS4ERR_DELEG_REVOKED:
+ case -NFS4ERR_ADMIN_REVOKED:
+ case -NFS4ERR_BAD_STATEID:
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_OLD_STATEID:
+ case -NFS4ERR_OPENMODE:
+ case -NFS4ERR_EXPIRED:
+ return true;
+ }
+ return false;
+}
+
void __nfs4_read_done_cb(struct nfs_read_data *data)
{
nfs_invalidate_atime(data->header->inode);
@@ -3487,6 +3514,20 @@ static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
return 0;
}
+static bool nfs4_read_stateid_changed(struct rpc_task *task,
+ struct nfs_readargs *args)
+{
+
+ if (!nfs4_error_stateid_expired(task->tk_status) ||
+ nfs4_stateid_is_current(&args->stateid,
+ args->context,
+ args->lock_context,
+ FMODE_READ))
+ return false;
+ rpc_restart_call_prepare(task);
+ return true;
+}
+
static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
@@ -3494,7 +3535,8 @@ static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
if (!nfs4_sequence_done(task, &data->res.seq_res))
return -EAGAIN;
-
+ if (nfs4_read_stateid_changed(task, &data->args))
+ return -EAGAIN;
return data->read_done_cb ? data->read_done_cb(task, data) :
nfs4_read_done_cb(task, data);
}
@@ -3533,10 +3575,26 @@ static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data
return 0;
}
+static bool nfs4_write_stateid_changed(struct rpc_task *task,
+ struct nfs_writeargs *args)
+{
+
+ if (!nfs4_error_stateid_expired(task->tk_status) ||
+ nfs4_stateid_is_current(&args->stateid,
+ args->context,
+ args->lock_context,
+ FMODE_WRITE))
+ return false;
+ rpc_restart_call_prepare(task);
+ return true;
+}
+
static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
{
if (!nfs4_sequence_done(task, &data->res.seq_res))
return -EAGAIN;
+ if (nfs4_write_stateid_changed(task, &data->args))
+ return -EAGAIN;
return data->write_done_cb ? data->write_done_cb(task, data) :
nfs4_write_done_cb(task, data);
}
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 8db102c..4e95bd7 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -989,13 +989,14 @@ int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
return 0;
}
-static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
+static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
+ struct nfs4_state *state,
const struct nfs_lockowner *lockowner)
{
struct nfs4_lock_state *lsp;
fl_owner_t fl_owner;
pid_t fl_pid;
- bool ret = false;
+ int ret = -ENOENT;
if (lockowner == NULL)
@@ -1010,7 +1011,10 @@ static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
nfs4_stateid_copy(dst, &lsp->ls_stateid);
- ret = true;
+ ret = 0;
+ smp_rmb();
+ if (!list_empty(&lsp->ls_seqid.list))
+ ret = -EWOULDBLOCK;
}
spin_unlock(&state->state_lock);
nfs4_put_lock_state(lsp);
@@ -1018,28 +1022,38 @@ out:
return ret;
}
-static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
+static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
+ int ret;
int seq;
do {
seq = read_seqbegin(&state->seqlock);
nfs4_stateid_copy(dst, &state->stateid);
+ ret = 0;
+ smp_rmb();
+ if (!list_empty(&state->owner->so_seqid.list))
+ ret = -EWOULDBLOCK;
} while (read_seqretry(&state->seqlock, seq));
+ return ret;
}
/*
* 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,
+int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
fmode_t fmode, const struct nfs_lockowner *lockowner)
{
+ int ret = 0;
if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
- return;
- if (nfs4_copy_lock_stateid(dst, state, lockowner))
- return;
- nfs4_copy_open_stateid(dst, state);
+ goto out;
+ ret = nfs4_copy_lock_stateid(dst, state, lockowner);
+ if (ret != -ENOENT)
+ goto out;
+ ret = nfs4_copy_open_stateid(dst, state);
+out:
+ return ret;
}
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
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