ext4: update mtime in ext4_punch_hole even if no blocks are released

commit eee597ac931305eff3d3fd1d61d6aae553bc0984 upstream.

Currently in ext4_punch_hole we're going to skip the mtime update if
there are no actual blocks to release. However we've actually modified
the file by zeroing the partial block so the mtime should be updated.

Moreover the sync and datasync handling is skipped as well, which is
also wrong. Fix it.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Joe Habermann <joe.habermann@quantum.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 56ce7fd0f0d0f868c58afcb0fb49a4a74f4026a8..30efeb656c1ec0e76336f04bb483786787cd27be 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3787,28 +3787,28 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
                EXT4_BLOCK_SIZE_BITS(sb);
        stop_block = (offset + length) >> EXT4_BLOCK_SIZE_BITS(sb);
 
-       /* If there are no blocks to remove, return now */
-       if (first_block >= stop_block)
-               goto out_stop;
+       /* If there are blocks to remove, do it */
+       if (stop_block > first_block) {
 
-       down_write(&EXT4_I(inode)->i_data_sem);
-       ext4_discard_preallocations(inode);
+               down_write(&EXT4_I(inode)->i_data_sem);
+               ext4_discard_preallocations(inode);
 
-       ret = ext4_es_remove_extent(inode, first_block,
-                                   stop_block - first_block);
-       if (ret) {
-               up_write(&EXT4_I(inode)->i_data_sem);
-               goto out_stop;
-       }
+               ret = ext4_es_remove_extent(inode, first_block,
+                                           stop_block - first_block);
+               if (ret) {
+                       up_write(&EXT4_I(inode)->i_data_sem);
+                       goto out_stop;
+               }
 
-       if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
-               ret = ext4_ext_remove_space(inode, first_block,
-                                           stop_block - 1);
-       else
-               ret = ext4_ind_remove_space(handle, inode, first_block,
-                                           stop_block);
+               if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+                       ret = ext4_ext_remove_space(inode, first_block,
+                                                   stop_block - 1);
+               else
+                       ret = ext4_ind_remove_space(handle, inode, first_block,
+                                                   stop_block);
 
-       up_write(&EXT4_I(inode)->i_data_sem);
+               up_write(&EXT4_I(inode)->i_data_sem);
+       }
        if (IS_SYNC(inode))
                ext4_handle_sync(handle);