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Memory mappings were only truncated on an explicit truncate, but not when the file size was changed externally. Fix this by moving the truncation code from fuse_setattr to fuse_change_attributes. Yes, there are races between write and and external truncation, but we can't really do anything about them. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>