ext4: remove #ifdef CONFIG_EXT4_INDEX

CONFIG_EXT4_INDEX is not an exposed config option in the kernel, and it is
unconditionally defined in ext4_fs.h.  tune2fs is already able to turn off
dir indexing, so at this point it's just cluttering up the code.  Remove
it.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

3 files changed, 2 insertions, 39 deletions

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 0fb1e62b20d0..f612bef98315 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -47,9 +47,7 @@ const struct file_operations ext4_dir_operations = {
         .compat_ioctl   = ext4_compat_ioctl,
 #endif
         .fsync          = ext4_sync_file,       /* BKL held */
-#ifdef CONFIG_EXT4_INDEX
         .release        = ext4_release_dir,
-#endif
 };
 
 
@@ -107,7 +105,6 @@ static int ext4_readdir(struct file * filp,
 
         sb = inode->i_sb;
 
-#ifdef CONFIG_EXT4_INDEX
         if (EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
                                     EXT4_FEATURE_COMPAT_DIR_INDEX) &&
             ((EXT4_I(inode)->i_flags & EXT4_INDEX_FL) ||
@@ -123,7 +120,6 @@ static int ext4_readdir(struct file * filp,
                  */
                 EXT4_I(filp->f_path.dentry->d_inode)->i_flags &= ~EXT4_INDEX_FL;
         }
-#endif
         stored = 0;
         offset = filp->f_pos & (sb->s_blocksize - 1);
 
@@ -232,7 +228,6 @@ out:
         return ret;
 }
 
-#ifdef CONFIG_EXT4_INDEX
 /*
  * These functions convert from the major/minor hash to an f_pos
  * value.
@@ -518,5 +513,3 @@ static int ext4_release_dir (struct inode * inode, struct file * filp)
 
         return 0;
 }
-
-#endif
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5fdb862e71c4..94ee6f315dc1 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -144,7 +144,6 @@ struct dx_map_entry
         u16 size;
 };
 
-#ifdef CONFIG_EXT4_INDEX
 static inline unsigned dx_get_block (struct dx_entry *entry);
 static void dx_set_block (struct dx_entry *entry, unsigned value);
 static inline unsigned dx_get_hash (struct dx_entry *entry);
@@ -766,8 +765,6 @@ static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block)
         dx_set_block(new, block);
         dx_set_count(entries, count + 1);
 }
-#endif
-
 
 static void ext4_update_dx_flag(struct inode *inode)
 {
@@ -869,7 +866,6 @@ static struct buffer_head * ext4_find_entry (struct dentry *dentry,
         name = dentry->d_name.name;
         if (namelen > EXT4_NAME_LEN)
                 return NULL;
-#ifdef CONFIG_EXT4_INDEX
         if (is_dx(dir)) {
                 bh = ext4_dx_find_entry(dentry, res_dir, &err);
                 /*
@@ -881,7 +877,6 @@ static struct buffer_head * ext4_find_entry (struct dentry *dentry,
                         return bh;
                 dxtrace(printk("ext4_find_entry: dx failed, falling back\n"));
         }
-#endif
         nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
         start = EXT4_I(dir)->i_dir_start_lookup;
         if (start >= nblocks)
@@ -957,7 +952,6 @@ cleanup_and_exit:
         return ret;
 }
 
-#ifdef CONFIG_EXT4_INDEX
 static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry,
                        struct ext4_dir_entry_2 **res_dir, int *err)
 {
@@ -1025,7 +1019,6 @@ errout:
         dx_release (frames);
         return NULL;
 }
-#endif
 
 static struct dentry *ext4_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
 {
@@ -1121,7 +1114,6 @@ static inline void ext4_set_de_type(struct super_block *sb,
                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
 }
 
-#ifdef CONFIG_EXT4_INDEX
 /*
  * Move count entries from end of map between two memory locations.
  * Returns pointer to last entry moved.
@@ -1266,8 +1258,6 @@ errout:
         *error = err;
         return NULL;
 }
-#endif
-
 
 /*
  * Add a new entry into a directory (leaf) block.  If de is non-NULL,
@@ -1364,7 +1354,6 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
         return 0;
 }
 
-#ifdef CONFIG_EXT4_INDEX
 /*
  * This converts a one block unindexed directory to a 3 block indexed
  * directory, and adds the dentry to the indexed directory.
@@ -1443,7 +1432,6 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
 
         return add_dirent_to_buf(handle, dentry, inode, de, bh);
 }
-#endif
 
 /*
  *      ext4_add_entry()
@@ -1464,9 +1452,7 @@ static int ext4_add_entry (handle_t *handle, struct dentry *dentry,
         struct ext4_dir_entry_2 *de;
         struct super_block * sb;
         int     retval;
-#ifdef CONFIG_EXT4_INDEX
         int     dx_fallback=0;
-#endif
         unsigned blocksize;
         u32 block, blocks;
 
@@ -1474,7 +1460,6 @@ static int ext4_add_entry (handle_t *handle, struct dentry *dentry,
         blocksize = sb->s_blocksize;
         if (!dentry->d_name.len)
                 return -EINVAL;
-#ifdef CONFIG_EXT4_INDEX
         if (is_dx(dir)) {
                 retval = ext4_dx_add_entry(handle, dentry, inode);
                 if (!retval || (retval != ERR_BAD_DX_DIR))
@@ -1483,7 +1468,6 @@ static int ext4_add_entry (handle_t *handle, struct dentry *dentry,
                 dx_fallback++;
                 ext4_mark_inode_dirty(handle, dir);
         }
-#endif
         blocks = dir->i_size >> sb->s_blocksize_bits;
         for (block = 0, offset = 0; block < blocks; block++) {
                 bh = ext4_bread(handle, dir, block, 0, &retval);
@@ -1493,11 +1477,9 @@ static int ext4_add_entry (handle_t *handle, struct dentry *dentry,
                 if (retval != -ENOSPC)
                         return retval;
 
-#ifdef CONFIG_EXT4_INDEX
                 if (blocks == 1 && !dx_fallback &&
                     EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX))
                         return make_indexed_dir(handle, dentry, inode, bh);
-#endif
                 brelse(bh);
         }
         bh = ext4_append(handle, dir, &block, &retval);
@@ -1509,7 +1491,6 @@ static int ext4_add_entry (handle_t *handle, struct dentry *dentry,
         return add_dirent_to_buf(handle, dentry, inode, de, bh);
 }
 
-#ifdef CONFIG_EXT4_INDEX
 /*
  * Returns 0 for success, or a negative error value
  */
@@ -1644,7 +1625,6 @@ cleanup:
         dx_release(frames);
         return err;
 }
-#endif
 
 /*
  * ext4_delete_entry deletes a directory entry by merging it with the
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index 3baeb996fd3f..151738af6be2 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -36,10 +36,6 @@
 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
 #define EXT4_MAX_RESERVE_BLOCKS         1027
 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
-/*
- * Always enable hashed directories
- */
-#define CONFIG_EXT4_INDEX
 
 /*
  * Debug code
@@ -766,17 +762,11 @@ struct ext4_dir_entry_2 {
  * (c) Daniel Phillips, 2001
  */
 
-#ifdef CONFIG_EXT4_INDEX
-  #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
-                                              EXT4_FEATURE_COMPAT_DIR_INDEX) && \
+#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
+                                      EXT4_FEATURE_COMPAT_DIR_INDEX) && \
                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
-#else
-  #define is_dx(dir) 0
-#define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
-#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
-#endif
 
 /* Legal values for the dx_root hash_version field: */