On Tue, Apr 06, 2021 at 06:44:52PM -0700, Michel Lespinasse wrote:
> Change xfs_filemap_map_pages() account for the fact that it can not
> block anymore, as it is now running within an rcu read lock.
Better to just delete xfs_filemap_map_pages() and use filemap_map_pages
directly.
Call the vm_ops->map_pages method within an rcu read locked section.
In the speculative case, verify the mmap sequence lock at the start of
the section. A match guarantees that the original vma is still valid
at that time, and that the associated vma->vm_file stays valid while
the vm_ops->map_pages
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