From: Peng Tao <bergwolf@xxxxxxxxx>
There is no need to keep lseg reference when read/write through MDS.
This fixes a null pointer crash at nfs_post_op_update_inode_force_wcc
because nfs4_proc_write_setup will unset wdata->res.fattr if wdata->lseg
is not NULL.
Signed-off-by: Peng Tao <peng_tao@xxxxxxx>
---
fs/nfs/pnfs.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 3b20753..fda3019 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1182,6 +1182,9 @@ pnfs_ld_write_done(struct nfs_write_data *data)
dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
data->pnfs_error);
+
+ put_lseg(data->lseg);
+ data->lseg = NULL;
status = nfs_initiate_write(data, NFS_CLIENT(data->inode),
data->mds_ops, NFS_FILE_SYNC);
return status ? : -EAGAIN;
@@ -1282,6 +1285,9 @@ pnfs_ld_read_done(struct nfs_read_data *data)
dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
data->pnfs_error);
+
+ put_lseg(data->lseg);
+ data->lseg = NULL;
status = nfs_initiate_read(data, NFS_CLIENT(data->inode),
data->mds_ops);
return status ? : -EAGAIN;
--
1.7.4.1
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