2.6.24

 fs

 ext2

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 9fd0ec5..c87ae29 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -33,22 +33,9 @@ struct ext2_inode_info {
     */
    __u32   i_block_group;
 
-   /*
-    * i_next_alloc_block is the logical (file-relative) number of the
-    * most-recently-allocated block in this file.  Yes, it is misnamed.
-    * We use this for detecting linearly ascending allocation requests.
-    */
-   __u32   i_next_alloc_block;
+   /* block reservation info */
+   struct ext2_block_alloc_info *i_block_alloc_info;
 
-   /*
-    * i_next_alloc_goal is the *physical* companion to i_next_alloc_block.
-    * it the the physical block number of the block which was most-recently
-    * allocated to this file.  This give us the goal (target) for the next
-    * allocation when we detect linearly ascending requests.
-    */
-   __u32   i_next_alloc_goal;
-   __u32   i_prealloc_block;
-   __u32   i_prealloc_count;
    __u32   i_dir_start_lookup;
 #ifdef CONFIG_EXT2_FS_XATTR
    /*
@@ -65,7 +52,16 @@ struct ext2_inode_info {
    struct posix_acl   *i_default_acl;
 #endif
    rwlock_t i_meta_lock;
+
+   /*
+    * truncate_mutex is for serialising ext2_truncate() against
+    * ext2_getblock().  It also protects the internals of the inode's
+    * reservation data structures: ext2_reserve_window and
+    * ext2_reserve_window_node.
+    */
+   struct mutex truncate_mutex;
    struct inode   vfs_inode;
+   struct list_head i_orphan;   /* unlinked but open inodes */
 };
 
 /*
@@ -91,8 +87,9 @@ static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
 /* balloc.c */
 extern int ext2_bg_has_super(struct super_block *sb, int group);
 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
-extern int ext2_new_block (struct inode *, unsigned long,
-            __u32 *, __u32 *, int *);
+extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
+extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
+            unsigned long *, int *);
 extern void ext2_free_blocks (struct inode *, unsigned long,
                unsigned long);
 extern unsigned long ext2_count_free_blocks (struct super_block *);
@@ -101,6 +98,10 @@ extern void ext2_check_blocks_bitmap (struct super_block *);
 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
                       unsigned int block_group,
                       struct buffer_head ** bh);
+extern void ext2_discard_reservation (struct inode *);
+extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
+extern void ext2_init_block_alloc_info(struct inode *);
+extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
 
 /* dir.c */
 extern int ext2_add_link (struct dentry *, struct inode *);
@@ -128,12 +129,14 @@ extern int ext2_write_inode (struct inode *, int);
 extern void ext2_put_inode (struct inode *);
 extern void ext2_delete_inode (struct inode *);
 extern int ext2_sync_inode (struct inode *);
-extern void ext2_discard_prealloc (struct inode *);
 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
 extern void ext2_truncate (struct inode *);
 extern int ext2_setattr (struct dentry *, struct iattr *);
 extern void ext2_set_inode_flags(struct inode *inode);
 extern void ext2_get_inode_flags(struct ext2_inode_info *);
+int __ext2_write_begin(struct file *file, struct address_space *mapping,
+      loff_t pos, unsigned len, unsigned flags,
+      struct page **pagep, void **fsdata);
 
 /* ioctl.c */
 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
@@ -175,3 +178,10 @@ extern const struct inode_operations ext2_special_inode_operations;
 /* symlink.c */
 extern const struct inode_operations ext2_fast_symlink_inode_operations;
 extern const struct inode_operations ext2_symlink_inode_operations;
+
+static inline ext2_fsblk_t
+ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
+{
+   return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
+      le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
+}