NFS: struct nfs_commit_info.lock must always point to inode->i_lock

Commit 411a99adffb4f (nfs: clear_request_commit while holding i_lock)
assumes that the nfs_commit_info always points to the inode->i_lock.
For historical reasons, that is not the case for O_DIRECT writes.

Cc: Weston Andros Adamson <dros@primarydata.com>
Fixes: 411a99adffb4f ("nfs: clear_request_commit while holding i_lock")
Cc: stable@vger.kernel.org # 3.17.x
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 7077521acdf4609cc57f54da4ce11bb331493632..e907c8cf732e3cff6bc9711ccf0b20c9261cdca2 100644 (file)
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -283,7 +283,7 @@ static void nfs_direct_release_pages(struct page **pages, unsigned int npages)
 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
                              struct nfs_direct_req *dreq)
 {
-       cinfo->lock = &dreq->lock;
+       cinfo->lock = &dreq->inode->i_lock;
        cinfo->mds = &dreq->mds_cinfo;
        cinfo->ds = &dreq->ds_cinfo;
        cinfo->dreq = dreq;

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 38d96ba935c2d7fd91aaf444a598b832b1c0ee4e..9a39132fda498604d1ed0686110e98234bd1dc21 100644 (file)
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1351,7 +1351,7 @@ struct nfs_commit_completion_ops {
 };
 
 struct nfs_commit_info {
-       spinlock_t                      *lock;
+       spinlock_t                      *lock;  /* inode->i_lock */
        struct nfs_mds_commit_info      *mds;
        struct pnfs_ds_commit_info      *ds;
        struct nfs_direct_req           *dreq;  /* O_DIRECT request */