note that VOP_STRATEGY may block.
Learned from: vm/swap_pager.c comment above swap_pager_putpages()
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@ -51,6 +51,8 @@ the buffer to be read or written
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.Pp
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This call either reads or writes data from a file, depending on the value of
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.Fa bp->b_io.bio_cmd .
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.Pp
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The call may block.
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.Sh RETURN VALUES
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Zero is returned on success, otherwise an error is returned.
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.Sh SEE ALSO
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