tree c0fec691c12f1efa3f8fa74d1b113a88b98d15c7
parent 66153f6e0f89c75d18e490739b0149dfd2e53b69
author Boaz Harrosh <bharrosh@panasas.com> 1342788627 +0300
committer Boaz Harrosh <bharrosh@panasas.com> 1343908702 +0300

exofs: Fix __r4w_get_page when offset is beyond i_size

It is very common for the end of the file to be unaligned on
stripe size. But since we know it's beyond file's end then
the XOR should be preformed with all zeros.

Old code used to just read zeros out of the OSD devices, which is a great
waist. But what scares me more about this situation is that, we now have
pages attached to the file's mapping that are beyond i_size. I don't
like the kind of bugs this calls for.

Fix both birds, by returning a global ZERO_PAGE, if offset is beyond
i_size.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>