lustre/kernel_patches/patches/vfs-lookup_last-vanilla-2.6.10-fc3.patch

   1 Index: linux-2.6.10/fs/namei.c
   2 ===================================================================
   3 --- linux-2.6.10.orig/fs/namei.c        2005-03-31 17:12:26.403006808 +0800
   4 +++ linux-2.6.10/fs/namei.c     2005-03-31 17:20:37.388365688 +0800
   5 @@ -783,8 +783,11 @@
   6                         goto out_dput;
   7
   8                 if (inode->i_op->follow_link) {
   9 +                       int saved_flags = nd->flags;
  10                         mntget(next.mnt);
  11 +                       nd->flags |= LOOKUP_LINK_NOTLAST;
  12                         err = do_follow_link(next.dentry, nd);
  13 +                       nd->flags = saved_flags;
  14                         dput(next.dentry);
  15                         mntput(next.mnt);
  16                         if (err)
  17 @@ -830,7 +833,9 @@
  18                         if (err < 0)
  19                                 break;
  20                 }
  21 +               nd->flags |= LOOKUP_LAST;
  22                 err = do_lookup(nd, &this, &next, atomic);
  23 +               nd->flags &= ~LOOKUP_LAST;
  24                 if (err)
  25                         break;
  26                 follow_mount(&next.mnt, &next.dentry);
  27 @@ -876,10 +881,14 @@
  28                  */
  29                 if (nd->dentry && nd->dentry->d_sb &&
  30                     (nd->dentry->d_sb->s_type->fs_flags & FS_REVAL_DOT)) {
  31 -                       err = -ESTALE;
  32 +                       nd->flags |= LOOKUP_LAST;
  33 +                       err = !nd->dentry->d_op->d_revalidate(nd->dentry, nd);
  34 +                        nd->flags &= ~LOOKUP_LAST;
  35                         /* Note: we do not d_invalidate() */
  36 -                       if (!nd->dentry->d_op->d_revalidate(nd->dentry, nd))
  37 +                       if (err) {
  38 +                               err = -ESTALE;
  39                                 break;
  40 +                       }
  41                 }
  42  return_base:
  43                 return 0;
  44 @@ -1446,7 +1455,9 @@
  45         dir = nd->dentry;
  46         nd->flags &= ~LOOKUP_PARENT;
  47         down(&dir->d_inode->i_sem);
  48 +       nd->flags |= LOOKUP_LAST;
  49         dentry = __lookup_hash(&nd->last, nd->dentry, nd);
  50 +       nd->flags &= ~LOOKUP_LAST;
  51
  52  do_last:
  53         error = PTR_ERR(dentry);
  54 @@ -1559,7 +1570,9 @@
  55         }
  56         dir = nd->dentry;
  57         down(&dir->d_inode->i_sem);
  58 +       nd->flags |= LOOKUP_LAST;
  59         dentry = __lookup_hash(&nd->last, nd->dentry, nd);
  60 +       nd->flags &= ~LOOKUP_LAST;
  61         putname(nd->last.name);
  62         goto do_last;
  63  }
  64 Index: linux-2.6.10/include/linux/namei.h
  65 ===================================================================
  66 --- linux-2.6.10.orig/include/linux/namei.h     2005-03-31 17:10:14.746021712 +0800
  67 +++ linux-2.6.10/include/linux/namei.h  2005-03-31 17:21:41.178668088 +0800
  68 @@ -73,7 +73,9 @@
  69  #define LOOKUP_PARENT          16
  70  #define LOOKUP_NOALT           32
  71  #define LOOKUP_ATOMIC          64
  72 -
  73 +#define LOOKUP_LAST            128
  74 +#define LOOKUP_LINK_NOTLAST    256
  75 ++
  76  /*
  77   * Intent data
  78   */