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authorJeff Layton <jlayton@poochiereds.net>2015-11-29 14:46:14 +0100
committerJ. Bruce Fields <bfields@redhat.com>2015-12-16 17:49:58 +0100
commitbe20aa00c67102aaa54599518c086a2338b19f4c (patch)
treef44c188279fe553b8b47f6398b7782e26ec60bbb /fs/nfsd
parentLinux 4.4-rc1 (diff)
downloadlinux-be20aa00c67102aaa54599518c086a2338b19f4c.tar.xz
linux-be20aa00c67102aaa54599518c086a2338b19f4c.zip
nfsd: don't hold ls_mutex across a layout recall
We do need to serialize layout stateid morphing operations, but we currently hold the ls_mutex across a layout recall which is pretty ugly. It's also unnecessary -- once we've bumped the seqid and copied it, we don't need to serialize the rest of the CB_LAYOUTRECALL vs. anything else. Just drop the mutex once the copy is done. This was causing a "workqueue leaked lock or atomic" warning and an occasional deadlock. There's more work to be done here but this fixes the immediate regression. Fixes: cc8a55320b5f "nfsd: serialize layout stateid morphing operations" Cc: stable@vger.kernel.org Reported-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4layouts.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c
index 9ffef06b30d5..c9d6c715c0fb 100644
--- a/fs/nfsd/nfs4layouts.c
+++ b/fs/nfsd/nfs4layouts.c
@@ -616,6 +616,7 @@ nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
mutex_lock(&ls->ls_mutex);
nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid);
+ mutex_unlock(&ls->ls_mutex);
}
static int
@@ -659,7 +660,6 @@ nfsd4_cb_layout_release(struct nfsd4_callback *cb)
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);