tree 249547a50a16d33e2c3c2dea96a592b2b823dc2b
parent 9022e24e8946400d53719a761815069c3183e2bd
author Christopher James Halse Rogers <christopher.halse.rogers@canonical.com> 1378793205 +0530
committer Sumit Semwal <sumit.semwal@linaro.org> 1378793205 +0530

dma-buf: Expose buffer size to userspace (v2)

Each dma-buf has an associated size and it's reasonable for userspace
to want to know what it is.

Since userspace already has an fd, expose the size using the
size = lseek(fd, SEEK_END, 0); lseek(fd, SEEK_CUR, 0);
idiom.

v2: Added Daniel's sugeested documentation, with minor fixups

Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>