1 files changed, 10 insertions, 7 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index c74b1948feb0..635135e6148e 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -561,15 +561,16 @@ enum {
 #define EXT4_GET_BLOCKS_NO_PUT_HOLE             0x0200
 
 /*
- * The bit position of this flag must not overlap with any of the
- * EXT4_GET_BLOCKS_*.  It is used by ext4_ext_find_extent(),
+ * The bit position of these flags must not overlap with any of the
+ * EXT4_GET_BLOCKS_*.  They are used by ext4_ext_find_extent(),
  * read_extent_tree_block(), ext4_split_extent_at(),
- * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf() to
- * indicate that the we shouldn't be caching the extents when reading
- * from the extent tree while a truncate or punch hole operation
- * is in progress.
+ * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
+ * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
+ * caching the extents when reading from the extent tree while a
+ * truncate or punch hole operation is in progress.
  */
 #define EXT4_EX_NOCACHE                         0x0400
+#define EXT4_EX_FORCE_CACHE                     0x0800
 
 /*
  * Flags used by ext4_free_blocks
@@ -601,6 +602,7 @@ enum {
 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
+#define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 
 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 /*
@@ -1386,6 +1388,7 @@ enum {
                                            nolocking */
         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
         EXT4_STATE_ORDERED_MODE,        /* data=ordered mode */
+        EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
 };
 
 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
@@ -2705,7 +2708,7 @@ extern int ext4_find_delalloc_range(struct inode *inode,
 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
                         __u64 start, __u64 len);
-
+extern int ext4_ext_precache(struct inode *inode);
 
 /* move_extent.c */
 extern void ext4_double_down_write_data_sem(struct inode *first,