1 files changed, 26 insertions, 0 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 0fbe678d40bb..8ca2763df091 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4231,6 +4231,32 @@ err_out:
         return error;
 }
 
+int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
+                 struct kstat *stat)
+{
+        struct inode *inode;
+        unsigned long delalloc_blocks;
+
+        inode = dentry->d_inode;
+        generic_fillattr(inode, stat);
+
+        /*
+         * We can't update i_blocks if the block allocation is delayed
+         * otherwise in the case of system crash before the real block
+         * allocation is done, we will have i_blocks inconsistent with
+         * on-disk file blocks.
+         * We always keep i_blocks updated together with real
+         * allocation. But to not confuse with user, stat
+         * will return the blocks that include the delayed allocation
+         * blocks for this file.
+         */
+        spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
+        delalloc_blocks = EXT4_I(inode)->i_reserved_data_blocks;
+        spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
+
+        stat->blocks += (delalloc_blocks << inode->i_sb->s_blocksize_bits)>>9;
+        return 0;
+}
 
 /*
  * How many blocks doth make a writepage()?