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, 3 insertions, 2 deletions

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index e7317c8fda29..370bb4285597 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -182,7 +182,7 @@ int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
         entry->len = len;
         entry->disk_len = disk_len;
         entry->inode = inode;
-        if (type == BTRFS_ORDERED_NOCOW || type == BTRFS_ORDERED_COMPRESSED)
+        if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE)
                 set_bit(type, &entry->flags);
 
         /* one ref for the tree */
@@ -339,7 +339,8 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only)
                 ordered = list_entry(cur, struct btrfs_ordered_extent,
                                      root_extent_list);
                 if (nocow_only &&
-                    !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) {
+                    !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags) &&
+                    !test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) {
                         list_move(&ordered->root_extent_list,
                                   &root->fs_info->ordered_extents);
                         cond_resched_lock(&root->fs_info->ordered_extent_lock);