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

Pull vfs changes from Al Viro.
 "A lot of misc stuff.  The obvious groups:
   * Miklos' atomic_open series; kills the damn abuse of
     ->d_revalidate() by NFS, which was the major stumbling block for
     all work in that area.
   * ripping security_file_mmap() and dealing with deadlocks in the
     area; sanitizing the neighborhood of vm_mmap()/vm_munmap() in
     general.
   * ->encode_fh() switched to saner API; insane fake dentry in
     mm/cleancache.c gone.
   * assorted annotations in fs (endianness, __user)
   * parts of Artem's ->s_dirty work (jff2 and reiserfs parts)
   * ->update_time() work from Josef.
   * other bits and pieces all over the place.

  Normally it would've been in two or three pull requests, but
  signal.git stuff had eaten a lot of time during this cycle ;-/"

Fix up trivial conflicts in Documentation/filesystems/vfs.txt (the
'truncate_range' inode method was removed by the VM changes, the VFS
update adds an 'update_time()' method), and in fs/btrfs/ulist.[ch] (due
to sparse fix added twice, with other changes nearby).

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (95 commits)
  nfs: don't open in ->d_revalidate
  vfs: retry last component if opening stale dentry
  vfs: nameidata_to_filp(): don't throw away file on error
  vfs: nameidata_to_filp(): inline __dentry_open()
  vfs: do_dentry_open(): don't put filp
  vfs: split __dentry_open()
  vfs: do_last() common post lookup
  vfs: do_last(): add audit_inode before open
  vfs: do_last(): only return EISDIR for O_CREAT
  vfs: do_last(): check LOOKUP_DIRECTORY
  vfs: do_last(): make ENOENT exit RCU safe
  vfs: make follow_link check RCU safe
  vfs: do_last(): use inode variable
  vfs: do_last(): inline walk_component()
  vfs: do_last(): make exit RCU safe
  vfs: split do_lookup()
  Btrfs: move over to use ->update_time
  fs: introduce inode operation ->update_time
  reiserfs: get rid of resierfs_sync_super
  reiserfs: mark the superblock as dirty a bit later
  ...

1 files changed, 21 insertions, 11 deletions

diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index fbb2a643ef10..8e1b60e557b6 100644
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -40,38 +40,49 @@ struct ceph_nfs_confh {
         u32 parent_name_hash;
 } __attribute__ ((packed));
 
-static int ceph_encode_fh(struct dentry *dentry, u32 *rawfh, int *max_len,
-                          int connectable)
+/*
+ * The presence of @parent_inode here tells us whether NFS wants a
+ * connectable file handle.  However, we want to make a connectionable
+ * file handle unconditionally so that the MDS gets as much of a hint
+ * as possible.  That means we only use @parent_dentry to indicate
+ * whether nfsd wants a connectable fh, and whether we should indicate
+ * failure from a too-small @max_len.
+ */
+static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
+                          struct inode *parent_inode)
 {
         int type;
         struct ceph_nfs_fh *fh = (void *)rawfh;
         struct ceph_nfs_confh *cfh = (void *)rawfh;
-        struct dentry *parent;
-        struct inode *inode = dentry->d_inode;
         int connected_handle_length = sizeof(*cfh)/4;
         int handle_length = sizeof(*fh)/4;
+        struct dentry *dentry = d_find_alias(inode);
+        struct dentry *parent;
 
         /* don't re-export snaps */
         if (ceph_snap(inode) != CEPH_NOSNAP)
                 return -EINVAL;
 
-        spin_lock(&dentry->d_lock);
-        parent = dentry->d_parent;
-        if (*max_len >= connected_handle_length) {
+        /* if we found an alias, generate a connectable fh */
+        if (*max_len >= connected_handle_length && dentry) {
                 dout("encode_fh %p connectable\n", dentry);
-                cfh->ino = ceph_ino(dentry->d_inode);
+                spin_lock(&dentry->d_lock);
+                parent = dentry->d_parent;
+                cfh->ino = ceph_ino(inode);
                 cfh->parent_ino = ceph_ino(parent->d_inode);
                 cfh->parent_name_hash = ceph_dentry_hash(parent->d_inode,
                                                          dentry);
                 *max_len = connected_handle_length;
                 type = 2;
+                spin_unlock(&dentry->d_lock);
         } else if (*max_len >= handle_length) {
-                if (connectable) {
+                if (parent_inode) {
+                        /* nfsd wants connectable */
                         *max_len = connected_handle_length;
                         type = 255;
                 } else {
                         dout("encode_fh %p\n", dentry);
-                        fh->ino = ceph_ino(dentry->d_inode);
+                        fh->ino = ceph_ino(inode);
                         *max_len = handle_length;
                         type = 1;
                 }
@@ -79,7 +90,6 @@ static int ceph_encode_fh(struct dentry *dentry, u32 *rawfh, int *max_len,
                 *max_len = handle_length;
                 type = 255;
         }
-        spin_unlock(&dentry->d_lock);
         return type;
 }