On Mon, 2014-10-06 at 16:40 -0700, Zach Brown wrote:
> 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@xxxxxxxxx>
> ---
> drivers/target/target_core_file.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
> index 7d6cdda..176588f 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);
> }
Nice catch Zach. Applying to target-pending/for-next now.
Thank you,
--nab
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