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* dev.c: Add #include <sys/mman.h> for munmap decl.
* pager.c: Likewise.
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* dev.c (dev_buf_fill): Use munmap instead of vm_deallocate.
(dev_close): Likewise.
(dev_read): Likewise.
* pager.c (pager_write_page): Likewise.
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* pager.c (dev_stop_paging): Do not try to count ports in
PAGER_PORT_BUCKET if it has not been created.
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* storeio.c (options): New option -c/--no-cache.
(inhibit_cache): New variable.
(parse_opt): Make -c set it.
(trivfs_append_args): Report --no-cache if set.
(check_open_hook): Pass inhibit_cache flag to dev_open.
* dev.h (struct dev): New member `inhibit_cache'.
(dev_open): Update decl.
* dev.c (dev_open): Take new arg inhibit_cache, store in new dev.
If set, don't initialize buf_offs, io_lock, pager, pager_lock.
(dev_read, dev_write): If DEV->inhibit_cache is set, allow only
whole-block i/o: EINVAL for non-whole-block attempts.
* pager.c (dev_get_memory_object): If DEV->inhibit_cache is set, don't
make our own pager; if store_map returns EOPNOTSUPP, so do we.
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* pager.c (dev_get_memory_object): Deal with errors from
pager_create properly.
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* pager.c (service_paging_requests): New args for
ports_manage_port_operations_multithread.
* storeio.c (main): Likewise.
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Add PROT arg.
Use store_map.
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(dev_stop_paging): Work entirely by flushing user pagers; don't kill pager.
(pager_clear_user_data): Zero our pointer to the pager.
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Cast BUF into void ** for dev_read.
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