target/file: fix inclusive vfs_fsync_range() end

Both of the file target's calls to vfs_fsync_range() got the end offset
off by one.  The range is inclusive, not exclusive.  It would sync a bit
more data than was required.

The sync path already tested the length of the range and fell back to
LLONG_MAX so I copied that pattern in the rw path.

This is untested. I found the errors by inspection while following other
code.

Signed-off-by: Zach Brown <zab@zabbo.net>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index ab2c53b63cc3..72c83d98662b 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -415,7 +415,7 @@ fd_execute_sync_cache(struct se_cmd *cmd)
         } else {
                 start = cmd->t_task_lba * dev->dev_attrib.block_size;
                 if (cmd->data_length)
-                        end = start + cmd->data_length;
+                        end = start + cmd->data_length - 1;
                 else
                         end = LLONG_MAX;
         }
@@ -680,7 +680,12 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
                         struct fd_dev *fd_dev = FD_DEV(dev);
                         loff_t start = cmd->t_task_lba *
                                 dev->dev_attrib.block_size;
-                        loff_t end = start + cmd->data_length;
+                        loff_t end;
+
+                        if (cmd->data_length)
+                                end = start + cmd->data_length - 1;
+                        else
+                                end = LLONG_MAX;
 
                         vfs_fsync_range(fd_dev->fd_file, start, end, 1);
                 }