Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs pile 1 from Al Viro:
 "Unfortunately, this merge window it'll have a be a lot of small piles -
  my fault, actually, for not keeping #for-next in anything that would
  resemble a sane shape ;-/

  This pile: assorted fixes (the first 3 are -stable fodder, IMO) and
  cleanups + %pd/%pD formats (dentry/file pathname, up to 4 last
  components) + several long-standing patches from various folks.

  There definitely will be a lot more (starting with Miklos'
  check_submount_and_drop() series)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (26 commits)
  direct-io: Handle O_(D)SYNC AIO
  direct-io: Implement generic deferred AIO completions
  add formats for dentry/file pathnames
  kvm eventfd: switch to fdget
  powerpc kvm: use fdget
  switch fchmod() to fdget
  switch epoll_ctl() to fdget
  switch copy_module_from_fd() to fdget
  git simplify nilfs check for busy subtree
  ibmasmfs: don't bother passing superblock when not needed
  don't pass superblock to hypfs_{mkdir,create*}
  don't pass superblock to hypfs_diag_create_files
  don't pass superblock to hypfs_vm_create_files()
  oprofile: get rid of pointless forward declarations of struct super_block
  oprofilefs_create_...() do not need superblock argument
  oprofilefs_mkdir() doesn't need superblock argument
  don't bother with passing superblock to oprofile_create_stats_files()
  oprofile: don't bother with passing superblock to ->create_files()
  don't bother passing sb to oprofile_create_files()
  coh901318: don't open-code simple_read_from_buffer()
  ...

1 files changed, 8 insertions, 6 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index c2a4701d7286..d9454fe5653f 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1816,10 +1816,7 @@ static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
 static __be32 nfsd4_encode_path(const struct path *root,
 		const struct path *path, __be32 **pp, int *buflen)
 {
-	struct path cur = {
-		.mnt = path->mnt,
-		.dentry = path->dentry,
-	};
+	struct path cur = *path;
 	__be32 *p = *pp;
 	struct dentry **components = NULL;
 	unsigned int ncomponents = 0;
@@ -1859,14 +1856,19 @@ static __be32 nfsd4_encode_path(const struct path *root,
 
 	while (ncomponents) {
 		struct dentry *dentry = components[ncomponents - 1];
-		unsigned int len = dentry->d_name.len;
+		unsigned int len;
 
+		spin_lock(&dentry->d_lock);
+		len = dentry->d_name.len;
 		*buflen -= 4 + (XDR_QUADLEN(len) << 2);
-		if (*buflen < 0)
+		if (*buflen < 0) {
+			spin_unlock(&dentry->d_lock);
 			goto out_free;
+		}
 		WRITE32(len);
 		WRITEMEM(dentry->d_name.name, len);
 		dprintk("/%s", dentry->d_name.name);
+		spin_unlock(&dentry->d_lock);
 		dput(dentry);
 		ncomponents--;
 	}