Fix hole start calculation in btrfs_settar

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 515f8b0..bcf3b35 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1000,20 +1000,14 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
                struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 
                u64 mask = root->sectorsize - 1;
-               u64 pos = (inode->i_size + mask) & ~mask;
+               u64 hole_start = (inode->i_size + mask) & ~mask;
                u64 block_end = (attr->ia_size + mask) & ~mask;
-               u64 hole_start;
                u64 hole_size;
                u64 alloc_hint = 0;
 
-               if (attr->ia_size <= pos)
+               if (attr->ia_size <= hole_start)
                        goto out;
 
-               if (pos != inode->i_size)
-                       hole_start = pos + root->sectorsize;
-               else
-                       hole_start = pos;
-
                mutex_lock(&root->fs_info->fs_mutex);
                err = btrfs_check_free_space(root, 1, 0);
                mutex_unlock(&root->fs_info->fs_mutex);
@@ -1022,14 +1016,14 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
 
                btrfs_truncate_page(inode->i_mapping, inode->i_size);
 
-               lock_extent(io_tree, pos, block_end - 1, GFP_NOFS);
+               lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
                hole_size = block_end - hole_start;
 
                mutex_lock(&root->fs_info->fs_mutex);
                trans = btrfs_start_transaction(root, 1);
                btrfs_set_trans_block_group(trans, inode);
                err = btrfs_drop_extents(trans, root, inode,
-                                        pos, block_end, pos,
+                                        hole_start, block_end, hole_start,
                                         &alloc_hint);
 
                if (alloc_hint != EXTENT_MAP_INLINE) {
@@ -1043,7 +1037,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
                }
                btrfs_end_transaction(trans, root);
                mutex_unlock(&root->fs_info->fs_mutex);
-               unlock_extent(io_tree, pos, block_end - 1, GFP_NOFS);
+               unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
                if (err)
                        return err;
        }