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* dev.h (struct dev): New member `no_fileio' (flag).
* storeio.c (options): Add --no-file-io/-F.
(parse_opt): Parse it to set PARAMS->dev->no_fileio.
(trivfs_append_args): Add --no-file-io if it's set.
* dev.c (dev_open): Pass STORE_NOFILEIO flag if DEV->no_fileio is set.
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* dev.h (struct dev): New member nperopens.
* storeio.c (open_hook): Hold device lock and check if this is the
first open. If yes, activate the store.
(close_hook): Hold global_lock and check if this was the last
open. If yes, inactivate the store.
* dev.c (dev_open): Open the store with STORE_INACTIVE
(in store_parsed_open as well as in store_create).
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* dev.c (dev_open): Add missing argument `classes' to invocation
of store_create.
* dev.h: Include <hurd/trivfs.h> for struct trivfs_control.
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* storeio.c (parse_opt): Set PARAMS->store_params.store_optional.
(storeio_fsys): New global variable.
(main): Use it.
* dev.h: Declare it.
* dev.c (dev_open): If DEV->store_name is null, open the underlying
node using store_create.
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* dev.h (struct dev): New members store_name, readonly, rdev.
(dev_is_readonly): New inline function.
* dev.c (dev_open): Take just one arg, a struct dev whose store==0.
(dev_close): Shut down the store, but leave DEV intact with store==0.
* storeio.c (struct storeio_argp_params): New type.
(device, device_lock, store_name): Variables removed.
(readonly, inhibit_cache, enforce_store, rdev): Likewise.
These are all now members in struct storeio_argp_params or struct dev;
rdev now uses dev_t instead of int.
(parse_opt): Find a struct storeio_argp_params in STATE->input
and fill it in accordingly. Use makedev macro to construct rdev.
(trivfs_append_args): Find options in struct dev off control hook.
Use major, minor macros.
(main): Make DEVICE a local here, and point FSYS->hook at it.
Don't modify trivfs_allow_open.
(getroot_hook): New static function.
(trivfs_getroot_hook): New variable, initialized to that.
(check_open_hook): Find struct dev in CNTL->hook and
use new dev_open interface. Use dev_is_readonly.
(open_hook): Find struct dev in PEROPEN->cntl->hook and
check DEV->store.
(trivfs_modify_stat): Find struct dev in CRED->po->cntl->hook.
Use dev_is_readonly.
(trivfs_goaway): Find struct dev in FSYS->hook and use its lock.
(trivfs_S_fsys_syncfs): Find struct dev in CNTL->hook.
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* dev.h (struct dev): New member `enforced'.
* storeio.c (enforce_store): New variable.
(options, parse_opt, trivfs_append_args): Grok new option
--enforced/-e to set enforce_store.
(check_open_hook): Set DEVICE->enforced from enforce_store.
* io.c (trivfs_S_file_get_storage_info): If DEV->enforced is set
and the store flags lack STORE_ENFORCED, then return STORAGE_OTHER.
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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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Add PROT arg.
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Use void * buffers.
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