Btrfs: Add fallocate support v2

This patch updates btrfs-progs for fallocate support.

fallocate is a little different in Btrfs because we need to tell the
COW system that a given preallocated extent doesn't need to be
cow'd as long as there are no snapshots of it.  This leverages the
-o nodatacow checks.
 
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8bf6a085a73..d5ba3d1aaf9 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -462,8 +462,9 @@ struct btrfs_root_item {
         u8 level;
 } __attribute__ ((__packed__));
 
-#define BTRFS_FILE_EXTENT_REG 0
-#define BTRFS_FILE_EXTENT_INLINE 1
+#define BTRFS_FILE_EXTENT_INLINE 0
+#define BTRFS_FILE_EXTENT_REG 1
+#define BTRFS_FILE_EXTENT_PREALLOC 2
 
 struct btrfs_file_extent_item {
         /*
@@ -868,6 +869,7 @@ struct btrfs_root {
 #define BTRFS_INODE_NODATACOW           (1 << 1)
 #define BTRFS_INODE_READONLY            (1 << 2)
 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
+#define BTRFS_INODE_PREALLOC            (1 << 4)
 #define btrfs_clear_flag(inode, flag)   (BTRFS_I(inode)->flags &= \
                                          ~BTRFS_INODE_##flag)
 #define btrfs_set_flag(inode, flag)     (BTRFS_I(inode)->flags |= \
@@ -1924,6 +1926,9 @@ extern struct file_operations btrfs_file_operations;
 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, struct inode *inode,
                        u64 start, u64 end, u64 inline_limit, u64 *hint_block);
+int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
+                              struct btrfs_root *root,
+                              struct inode *inode, u64 start, u64 end);
 int btrfs_release_file(struct inode *inode, struct file *file);
 
 /* tree-defrag.c */