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Chuck Silvers authored
vn_read_from_obj() requires that all pages of a vnode (except the last partial page) be either completely valid or completely invalid, but for file systems with block size smaller than PAGE_SIZE, partially valid pages may exist anywhere in the file. Do not enable the vn_read_from_obj() path in this case. Reviewed by: mckusick, kib, markj Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D34836
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