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Message-Id: <1422483682-15393-48-git-send-email-kamal@canonical.com>
Date: Wed, 28 Jan 2015 14:19:50 -0800
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Peng Tao <tao.peng@...marydata.com>,
Trond Myklebust <trond.myklebust@...marydata.com>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 047/139] nfs41: fix nfs4_proc_layoutget error handling
3.13.11-ckt15 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Peng Tao <tao.peng@...marydata.com>
commit 4bd5a980de87d2b5af417485bde97b8eb3d6cf6a upstream.
nfs4_layoutget_release() drops layout hdr refcnt. Grab the refcnt
early so that it is safe to call .release in case nfs4_alloc_pages
fails.
Signed-off-by: Peng Tao <tao.peng@...marydata.com>
Fixes: a47970ff78147 ("NFSv4.1: Hold reference to layout hdr in layoutget")
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
fs/nfs/nfs4proc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index cc27e1f..a9902fb 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7581,6 +7581,9 @@ nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
dprintk("--> %s\n", __func__);
+ /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
+ pnfs_get_layout_hdr(NFS_I(inode)->layout);
+
lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
if (!lgp->args.layout.pages) {
nfs4_layoutget_release(lgp);
@@ -7593,9 +7596,6 @@ nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
lgp->res.seq_res.sr_slot = NULL;
nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
- /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
- pnfs_get_layout_hdr(NFS_I(inode)->layout);
-
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return ERR_CAST(task);
--
1.9.1
--
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