do d_instantiate/unlock_new_inode combinations safely

For anything NFS-exported we do _not_ want to unlock new inode
before it has grown an alias; original set of fixes got the
ordering right, but missed the nasty complication in case of
lockdep being enabled - unlock_new_inode() does
	lockdep_annotate_inode_mutex_key(inode)
which can only be done before anyone gets a chance to touch
->i_mutex.  Unfortunately, flipping the order and doing
unlock_new_inode() before d_instantiate() opens a window when
mkdir can race with open-by-fhandle on a guessed fhandle, leading
to multiple aliases for a directory inode and all the breakage
that follows from that.

	Correct solution: a new primitive (d_instantiate_new())
combining these two in the right order - lockdep annotate, then
d_instantiate(), then the rest of unlock_new_inode().  All
combinations of d_instantiate() with unlock_new_inode() should
be converted to that.

Cc: stable@kernel.org	# 2.6.29 and later
Tested-by: Mike Marshall <hubcap@omnibond.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

14 files changed, 57 insertions, 72 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index e064c49c9a9a..9e97cbb4f006 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6575,8 +6575,7 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
                 goto out_unlock_inode;
         } else {
                 btrfs_update_inode(trans, root, inode);
-                unlock_new_inode(inode);
-                d_instantiate(dentry, inode);
+                d_instantiate_new(dentry, inode);
         }
 
 out_unlock:
@@ -6652,8 +6651,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
                 goto out_unlock_inode;
 
         BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
 
 out_unlock:
         btrfs_end_transaction(trans);
@@ -6798,12 +6796,7 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
         if (err)
                 goto out_fail_inode;
 
-        d_instantiate(dentry, inode);
-        /*
-         * mkdir is special.  We're unlocking after we call d_instantiate
-         * to avoid a race with nfsd calling d_instantiate.
-         */
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
         drop_on_err = 0;
 
 out_fail:
@@ -10246,8 +10239,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
                 goto out_unlock_inode;
         }
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
 
 out_unlock:
         btrfs_end_transaction(trans);
diff --git a/fs/dcache.c b/fs/dcache.c
index 86d2de63461e..2acfc69878f5 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1899,6 +1899,28 @@ void d_instantiate(struct dentry *entry, struct inode * inode)
 }
 EXPORT_SYMBOL(d_instantiate);
 
+/*
+ * This should be equivalent to d_instantiate() + unlock_new_inode(),
+ * with lockdep-related part of unlock_new_inode() done before
+ * anything else.  Use that instead of open-coding d_instantiate()/
+ * unlock_new_inode() combinations.
+ */
+void d_instantiate_new(struct dentry *entry, struct inode *inode)
+{
+        BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
+        BUG_ON(!inode);
+        lockdep_annotate_inode_mutex_key(inode);
+        security_d_instantiate(entry, inode);
+        spin_lock(&inode->i_lock);
+        __d_instantiate(entry, inode);
+        WARN_ON(!(inode->i_state & I_NEW));
+        inode->i_state &= ~I_NEW;
+        smp_mb();
+        wake_up_bit(&inode->i_state, __I_NEW);
+        spin_unlock(&inode->i_lock);
+}
+EXPORT_SYMBOL(d_instantiate_new);
+
 /**
  * d_instantiate_no_diralias - instantiate a non-aliased dentry
  * @entry: dentry to complete
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 847904aa63a9..7bba8f2693b2 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -283,8 +283,7 @@ ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
                 iget_failed(ecryptfs_inode);
                 goto out;
         }
-        unlock_new_inode(ecryptfs_inode);
-        d_instantiate(ecryptfs_dentry, ecryptfs_inode);
+        d_instantiate_new(ecryptfs_dentry, ecryptfs_inode);
 out:
         return rc;
 }
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 55f7caadb093..152453a91877 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -41,8 +41,7 @@ static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
 {
         int err = ext2_add_link(dentry, inode);
         if (!err) {
-                unlock_new_inode(inode);
-                d_instantiate(dentry, inode);
+                d_instantiate_new(dentry, inode);
                 return 0;
         }
         inode_dec_link_count(inode);
@@ -255,8 +254,7 @@ static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
         if (err)
                 goto out_fail;
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
 out:
         return err;
 
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index b1f21e3a0763..4a09063ce1d2 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2411,8 +2411,7 @@ static int ext4_add_nondir(handle_t *handle,
         int err = ext4_add_entry(handle, dentry, inode);
         if (!err) {
                 ext4_mark_inode_dirty(handle, inode);
-                unlock_new_inode(inode);
-                d_instantiate(dentry, inode);
+                d_instantiate_new(dentry, inode);
                 return 0;
         }
         drop_nlink(inode);
@@ -2651,8 +2650,7 @@ out_clear_inode:
         err = ext4_mark_inode_dirty(handle, dir);
         if (err)
                 goto out_clear_inode;
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         if (IS_DIRSYNC(dir))
                 ext4_handle_sync(handle);
 
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index d5098efe577c..75e37fd720b2 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -294,8 +294,7 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 
         alloc_nid_done(sbi, ino);
 
-        d_instantiate(dentry, inode);
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
 
         if (IS_DIRSYNC(dir))
                 f2fs_sync_fs(sbi->sb, 1);
@@ -597,8 +596,7 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
         err = page_symlink(inode, disk_link.name, disk_link.len);
 
 err_out:
-        d_instantiate(dentry, inode);
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
 
         /*
          * Let's flush symlink data in order to avoid broken symlink as much as
@@ -661,8 +659,7 @@ static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 
         alloc_nid_done(sbi, inode->i_ino);
 
-        d_instantiate(dentry, inode);
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
 
         if (IS_DIRSYNC(dir))
                 f2fs_sync_fs(sbi->sb, 1);
@@ -713,8 +710,7 @@ static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 
         alloc_nid_done(sbi, inode->i_ino);
 
-        d_instantiate(dentry, inode);
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
 
         if (IS_DIRSYNC(dir))
                 f2fs_sync_fs(sbi->sb, 1);
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 0a754f38462e..e5a6deb38e1e 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -209,8 +209,7 @@ static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
                   __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
                   f->inocache->pino_nlink, inode->i_mapping->nrpages);
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         return 0;
 
  fail:
@@ -430,8 +429,7 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
         mutex_unlock(&dir_f->sem);
         jffs2_complete_reservation(c);
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         return 0;
 
  fail:
@@ -575,8 +573,7 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode
         mutex_unlock(&dir_f->sem);
         jffs2_complete_reservation(c);
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         return 0;
 
  fail:
@@ -747,8 +744,7 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode
         mutex_unlock(&dir_f->sem);
         jffs2_complete_reservation(c);
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         return 0;
 
  fail:
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index b41596d71858..56c3fcbfe80e 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -178,8 +178,7 @@ static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
                 unlock_new_inode(ip);
                 iput(ip);
         } else {
-                unlock_new_inode(ip);
-                d_instantiate(dentry, ip);
+                d_instantiate_new(dentry, ip);
         }
 
       out2:
@@ -313,8 +312,7 @@ static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
                 unlock_new_inode(ip);
                 iput(ip);
         } else {
-                unlock_new_inode(ip);
-                d_instantiate(dentry, ip);
+                d_instantiate_new(dentry, ip);
         }
 
       out2:
@@ -1059,8 +1057,7 @@ static int jfs_symlink(struct inode *dip, struct dentry *dentry,
                 unlock_new_inode(ip);
                 iput(ip);
         } else {
-                unlock_new_inode(ip);
-                d_instantiate(dentry, ip);
+                d_instantiate_new(dentry, ip);
         }
 
       out2:
@@ -1447,8 +1444,7 @@ static int jfs_mknod(struct inode *dir, struct dentry *dentry,
                 unlock_new_inode(ip);
                 iput(ip);
         } else {
-                unlock_new_inode(ip);
-                d_instantiate(dentry, ip);
+                d_instantiate_new(dentry, ip);
         }
 
       out1:
diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index 1a2894aa0194..dd52d3f82e8d 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -46,8 +46,7 @@ static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
         int err = nilfs_add_link(dentry, inode);
 
         if (!err) {
-                d_instantiate(dentry, inode);
-                unlock_new_inode(inode);
+                d_instantiate_new(dentry, inode);
                 return 0;
         }
         inode_dec_link_count(inode);
@@ -243,8 +242,7 @@ static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
                 goto out_fail;
 
         nilfs_mark_inode_dirty(inode);
-        d_instantiate(dentry, inode);
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
 out:
         if (!err)
                 err = nilfs_transaction_commit(dir->i_sb);
diff --git a/fs/orangefs/namei.c b/fs/orangefs/namei.c
index 6e3134e6d98a..1b5707c44c3f 100644
--- a/fs/orangefs/namei.c
+++ b/fs/orangefs/namei.c
@@ -75,8 +75,7 @@ static int orangefs_create(struct inode *dir,
                      get_khandle_from_ino(inode),
                      dentry);
 
-        d_instantiate(dentry, inode);
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
         orangefs_set_timeout(dentry);
         ORANGEFS_I(inode)->getattr_time = jiffies - 1;
         ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
@@ -332,8 +331,7 @@ static int orangefs_symlink(struct inode *dir,
                      "Assigned symlink inode new number of %pU\n",
                      get_khandle_from_ino(inode));
 
-        d_instantiate(dentry, inode);
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
         orangefs_set_timeout(dentry);
         ORANGEFS_I(inode)->getattr_time = jiffies - 1;
         ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
@@ -402,8 +400,7 @@ static int orangefs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode
                      "Assigned dir inode new number of %pU\n",
                      get_khandle_from_ino(inode));
 
-        d_instantiate(dentry, inode);
-        unlock_new_inode(inode);
+        d_instantiate_new(dentry, inode);
         orangefs_set_timeout(dentry);
         ORANGEFS_I(inode)->getattr_time = jiffies - 1;
         ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index bd39a998843d..5089dac02660 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -687,8 +687,7 @@ static int reiserfs_create(struct inode *dir, struct dentry *dentry, umode_t mod
         reiserfs_update_inode_transaction(inode);
         reiserfs_update_inode_transaction(dir);
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         retval = journal_end(&th);
 
 out_failed:
@@ -771,8 +770,7 @@ static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode
                 goto out_failed;
         }
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         retval = journal_end(&th);
 
 out_failed:
@@ -871,8 +869,7 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode
         /* the above add_entry did not update dir's stat data */
         reiserfs_update_sd(&th, dir);
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         retval = journal_end(&th);
 out_failed:
         reiserfs_write_unlock(dir->i_sb);
@@ -1187,8 +1184,7 @@ static int reiserfs_symlink(struct inode *parent_dir,
                 goto out_failed;
         }
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         retval = journal_end(&th);
 out_failed:
         reiserfs_write_unlock(parent_dir->i_sb);
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 0458dd47e105..c586026508db 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -622,8 +622,7 @@ static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
         if (fibh.sbh != fibh.ebh)
                 brelse(fibh.ebh);
         brelse(fibh.sbh);
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
 
         return 0;
 }
@@ -733,8 +732,7 @@ static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
         inc_nlink(dir);
         dir->i_ctime = dir->i_mtime = current_time(dir);
         mark_inode_dirty(dir);
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         if (fibh.sbh != fibh.ebh)
                 brelse(fibh.ebh);
         brelse(fibh.sbh);
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index 32545cd00ceb..d5f43ba76c59 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -39,8 +39,7 @@ static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
 {
         int err = ufs_add_link(dentry, inode);
         if (!err) {
-                unlock_new_inode(inode);
-                d_instantiate(dentry, inode);
+                d_instantiate_new(dentry, inode);
                 return 0;
         }
         inode_dec_link_count(inode);
@@ -193,8 +192,7 @@ static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
         if (err)
                 goto out_fail;
 
-        unlock_new_inode(inode);
-        d_instantiate(dentry, inode);
+        d_instantiate_new(dentry, inode);
         return 0;
 
 out_fail:
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 94acbde17bb1..66c6e17e61e5 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -224,6 +224,7 @@ extern seqlock_t rename_lock;
  * These are the low-level FS interfaces to the dcache..
  */
 extern void d_instantiate(struct dentry *, struct inode *);
+extern void d_instantiate_new(struct dentry *, struct inode *);
 extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
 extern struct dentry * d_instantiate_anon(struct dentry *, struct inode *);
 extern int d_instantiate_no_diralias(struct dentry *, struct inode *);