tree 05de87ea5f6268946abfe39c26770d65a7c4373e
parent 208adb6403e079ceeb8e731696615d22db6f397b
author Al Viro <viro@zeniv.linux.org.uk> 1386821271 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1390637583 -0500

btrfs: sanitize BTRFS_IOC_FILE_EXTENT_SAME

* don't assume that ->dest_count won't change between copy_from_user()
and memdup_user()
* use fdget instead of fget
* don't bother comparing superblocks when we'd already compared vfsmounts
* get rid of excessive goto
* use file_inode() instead of open-coding the sucker

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>