tree 24546aa499a82610c0af24849a6239fc7cd09130
parent 50babaf852e3b48680f7ea782a756043f64f8fe2
author Stephen Warren <swarren@nvidia.com> 1402512376 -0600
committer Tom Rini <trini@ti.com> 1403191133 -0400

fs: ext4: fix writing zero-length files

ext4fs_allocate_blocks() always allocates at least one block for a file.
If the file size is zero, this causes total_remaining_blocks to
underflow, which then causes an apparent hang while 2^32 blocks are
allocated.

To solve this, check that total_remaining_blocks is non-zero as part of
the loop condition (i.e. before each loop) rather than at the end of
the loop.

Signed-off-by: Stephen Warren <swarren@nvidia.com>