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* libdiskfs/diskfs.h (diskfs_begin_using_protid_payload): New function.
(diskfs_begin_using_control_payload): Likewise.
(diskfs_begin_using_bootinfo_payload): Likewise.
* libdiskfs/fsmutations.h: Add mutators.
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* libports/mig-decls.h (begin_using_port_info_payload): New function.
* libports/mig-mutate.h: Add mutator.
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These two functions map payloads to objects and port names. The former
can be used like `ports_lookup_port' to look up objects, the latter to
map payloads to port names if the server function expects a
`mach_port_t'.
* libports/ports.h: Add function ports_payload_get_name.
* libports/lookup-payload.c: New file.
* libports/ports.h (ports_lookup_payload): Add declaration.
* libports/Makefile (SRCS): Add lookup-payload.c.
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Declare all functions `extern inline' instead of `static inline'.
This allows us to use them in functions declared as `extern inline'.
* libshouldbeinlibc/refcount.h: Move here, and declare all functions
`extern inline'.
* libshouldbeinlibc/refcount.c: And define the functions here.
* libshouldbeinlibc/Makefile: Add `refcount.{c,h}'.
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This reverts "8927fbd63e29005ddb9b2c2264046089bf669857".
The change mistakenly adds mutators for the `startup' protocol, but
the server routine is for the `startup_notify' protocol.
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This adds support for the __LOCK_ATOMIC flag which requests atomicity of SH->EX
upgrades and EX->SH downgrades.
* libfshelp/lock-acquire.c (__LOCK_ATOMIC): New macro
(fshelp_acquire_lock): When __LOCK_ATOMIC is set, do not release the
lock early, change the lock hold atomically instead. On upgrade to LOCK_EX,
prevent new shared locks from being acquired to avoid starvation.
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* proc/notify.c (do_mach_notify_dead_name): When `pi' is NULL,
immediately return EOPNOTSUPP.
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* libdiskfs/dir-init.c (diskfs_init_dir): Fix fabrication of protid.
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Previously, `pager_demuxer' allocated a chunk of memory for the
response message. But if memory gets scarce, the kernel will issue a
large number of paging requests to free up memory. In such a
situation, allocating memory is dangerous.
Fix this by not allocating space for the response message, rather, use
a chunk of the workers stack space. Also, we only handle the `notify'
and `memory_object' protocol, which both only contain simple routines,
we only need a `mig_response_header_t'.
* libpager/demuxer.c (struct request): Remove `inp' and `outp'.
(request_inp): New function.
(pager_demuxer): Do not allocate memory for the response.
(mig_reply_setup): New function.
(worker_func): Adjust accordingly.
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Handle multiple request types as recommended by the Mach Server
Writer's Guide section 4, subsection "Handling Multiple Request
Types". This avoids initializing the reply message in every X_server
function.
* boot/boot.c (mig_reply_setup): Provide local version.
(request_server): Rename to `boot_demuxer', and improve the dispatch.
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* boot/boot.c (pseudo_time): New variable.
(main): Allocate port `pseudo_time'.
(ds_device_open): Give out `pseudo_time'.
(ds_device_map): Emulate Mach-style `Mapped Time'.
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* boot/boot.c (ds_device_get_status): Support flavor DEV_GET_RECORDS.
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* boot/boot.c (ds_xxx_device_set_status): Remove function.
(ds_xxx_device_get_status): Likewise.
(ds_xxx_device_set_filter): Likewise.
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The unused function `boot_script_read_file' requires access to the
default pager, which is privileged.
* boot/boot.c (defpager): Remove now unused variable.
(boot_script_read_file): Remove unused function.
(main): Do not acquire port to the default pager.
* boot/boot_script.h (boot_script_read_file): Remove declaration.
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GNU Mach never sent old-style bootstrap messages. Drop the unused
compatibility code.
* boot/boot.c (request_server): Drop unused code.
(bootstrap_compat): Drop unused function.
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* startup/startup.c (main): Also open `console' for reading.
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* proc/main.c (increase_priority): New function.
(main): Move code increasing the proc servers priority to a new
function and handle errors gracefully.
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* Makeconf (mach_defs_names): Add `gnumach'.
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Previously, the Hurd (ab)used the fact that the startup server speaks
all protocols on its message port. Any server that wished to register
for shutdown notifications would use proc_getmsgport to get a port to
the startup server.
This hardcodes the PID of /hurd/startup, and does not allow one to
point a server to ones own startup server (e.g. using remap).
Bind the startup server to /servers/startup instead. Use this to
contact the startup server.
* exec/main.c (S_exec_init): Use /servers/startup. Fall back to the
old method so that the system still boots when the node
/servers/startup is missing.
* hurd/paths.h (_SERVERS_STARTUP): New macro.
* libdiskfs/boot-start.c (diskfs_S_fsys_init): Use /servers/startup.
* libdiskfs/init-startup.c (_diskfs_init_completed): Likewise.
* pfinet/main.c (arrange_shutdown_notification): Likewise.
* startup/Makefile (OBJS): Add fsysServer.o.
* startup/startup.c (demuxer): Handle the fsys protocol.
(main): Bind to /servers/startup.
(S_fsys_getroot): Implement fsys_getroot. Stub out the rest.
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* startup/startup.c (demuxer): Fix the declaration of the server functions.
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Use the BOOT macro to print either halt or reboot instead of the
generic shutdown in the event of an system shutdown.
* startup/startup.c (reboot_system): Use more specific message.
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Formerly /hurd/startup would forward all signals to the child it
started (e.g. /libexec/runsystem).
The motivation for doing so is not revealed in the comments, nor it is
mentioned in the history of the version control system.
This patch removes the forwarding of signals to the child.
* startup/startup.c (process_signal): Do not pass signals on to the child.
* startup/stubs.c: Remove file.
* startup/Makefile: Remove stubs.c.
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This patch adds a minimalist init program. It is somewhat lacking in
features, but is able to bring up a Hurd system with the runsystem and
rc scripts. In fact, it roughly does what the former /hurd/init did,
modulo all the very early bootstrapping stuff and the startup
protocol. It is started when all the essential servers are up and
running, so it can make use of most of the POSIX goodies, making its
implementation much simpler.
* Makefile (prog-subdirs): Add init.
* daemons/runsystem.sh: Generalize runsystem so that it can start any
init as specified on the kernel command line. By default, it starts
/hurd/init.
* daemons/runsystem.hurd: This is a verbatim copy of runsystem.sh. It
is started by /hurd/init.
* daemons/rc.sh: Do not start /hurd/mach-defpager as it is already
started in runsystem.sh.
* daemons/Makefile (SRCS): Add runsystem.hurd.
* init/Makefile: New file.
* init/init.c: Likewise.
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This patch series splits /hurd/init into two programs. As a first
step, this patch renames /hurd/init to /hurd/startup. It is called
startup because it speaks the startup protocol.
* startup: Rename init to startup. Adjust accordingly.
* Makefile (prog-subdirs): Likewise.
* doc/hurd.texi (Server Bootstrap): Likewise.
* hurd/paths.h (_HURD_STARTUP): Likewise.
* libdiskfs/boot-start.c (diskfs_boot_init_program): Likewise.
* libdiskfs/opts-std-startup.c (startup_options): Likewise.
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* procfs/main.c (common_options): If possible, do not hard-code the
default values.
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* hurd/process.defs (proc_set_init_task): New procedure.
* hurd/process_reply.defs (proc_set_init_task): Likewise.
* hurd/process_request.defs (proc_set_init_task): Likewise.
* include/pids.h: Add HURD_PID_INIT as 1, adjust others accordingly.
* init/init.c (start_child): Register the child task.
* proc/proc.h (init_proc): New variable.
(create_startup_proc): Rename to create_init_proc.
* proc/main.c (main): Create placeholder proc object for pid 1.
* proc/mgt.c: Use init_proc instead of startup_proc, as the former is
the new root of the process tree.
(create_startup_proc): Rename to create_init_proc.
(S_proc_set_init_task): New function.
* doc/hurd.texi (Server Bootstrap): Update accordingly.
* procfs/main.c: Do not hard-code kernel pid, use pids.h instead.
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* trans/mtab.c (struct mtab): Add a hash table to keep track of seen
ports.
(mtab_mark_as_seen): New function that records the identity port of a
given node in the hash table and reports whether it has been there
before.
(mtab_populate): Use the new function to avoid running in circles.
(main, open_hook): Initialize hash table.
(close_hook): Free ports and destroy hash table.
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To avoid spurious ./, /, symlinks, etc.
* sutils/fstab.c (fs_set_mntent): Try to call realpath on mnt_fsname and mnt_dir
field of `mntent'.
(fstab_find_mount): Try to call realpath on `name' parameter.
(fstab_find): Do not try to call realpath.
(fstab_read): Reset errno to zero before calling getmntent.
* utils/umount.c (main): Do not warn about missing fstab entries for
active translators.
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* libnetfs/dir-lookup.c (netfs_S_dir_lookup): Initialize
register_translator to 0, otherwise it may be used uninitialized in case
of non-ENOENT errors.
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* libnetfs/dir-lookup.c (netfs_S_dir_lookup): Prepend current path to
the relative path before recording the active translator.
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* libdiskfs/dir-lookup.c (diskfs_S_dir_lookup): Prepend current path to
the relative path before recording the active translator.
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* term/ptyio.c (pty_io_read): Do not return EIO when there is no writer
any more but some output remains in the pipe.
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% fakeroot rpctrace install
[...]
63<--66(pid5363)->io_read (-1 8192) = 0 [... rpctrace crashes]
/bin/fakeauth: Segmentation fault for child 5362
/bin/settrans: Error 139 for child 5361
* utils/rpctrace.c (print_data): Fix this by guarding the code
escaping non-printable characters introduced in 84932431 against
`data' being NULL.
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d-i needs to be able to check whether /proc is mounted or not.
* procfs/main.c (netfs_get_source): New function.
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* mach-defpager/kalloc.c (MINSIZE): Set to sizeof(vm_offset_t) instead
of hardcoded 4.
(kalloc_init): Set kalloc_max to MINSIZE << (KLIST_MAX-1) instead of
hardcoded 16384.
(kalloc, kfree): Use the cache for the maximum size too.
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* libpager/pager-memcpy.c (pager_memcpy): Reset address passed to vm_map
on each loop, to avoid potentially monotonically increasing up to
VM_MAX_ADDRESS.
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Some versions of gnumach actually take address as a mapping hint, and would fail
if the hint is bogus. Make sure to pass 0 for those versions.
* libstore/memobj.c (memobj_read): Make sure to set *buf to 0 before
calling vm_map.
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Some versions of gnumach actually take address as a mapping hint, and would fail
if the hint is bogus. Make sure to pass 0 for those versions.
* console/pager.c (user_pager_create): Make sure to set *user to 0 before
calling vm_map.
* libdiskfs/disk-pager.c (diskfs_start_disk_pager): Make sure to set *image to 0
before calling vm_map.
* libpager/pager-memcpy.c (pager_memcpy): Set window to 0 before calling
vm_map.
* tmpfs/node.c (diskfs_get_filemap): Make sure to set np->dn->u.reg.memref to 0
before calling vm_map.
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Previously, libpager used an unbounded number of threads to receive
messages from the pager bucket. It used sequence barriers to execute
the requests to order requests to each object.
The sequence barriers are implemented in seqnos.c. A server function
uses _pager_wait_for_seqno to wait for its sequence number and
_pager_release_seqno to release it, or it uses _pager_update_seqno to
do both operations in one step.
These sequence barriers divide each server function in three parts: A,
B, and C. A_i happens "before" the sequence barrier i, B_i happens
"in order", C_i happens "after" the sequence barrier. This partial
order < has the following properties:
* This order is *per object*. Requests to different objects are not
ordered.
* A_i < B_i, B_i < C_i (due to the structure of the code)
* B_i < B_{i+1} (this is due to the sequence barriers)
* Note that only the B parts are ordered by the sequence numbers, we
are free to execute C_i and C_{i+1} in any possible order. The same
argument applies to the A parts.
The sequence barriers are implemented using a very simple ticket
algorithm. Every request, even the invalid ones, is processed by a
thread, and waits until the ticket count reaches its seqno, does some
work in-order, then increments the ticket and awakes all threads that
have piled up up to this moment. All of them except one will then
discover that it's not their turn yet and go to sleep again.
Creating one thread per request has proven to be problematic as
memory_object requests often arrive in large batches.
This patch does two things:
* Use a single thread to receive messages from the port bucket. All
incoming request are put into a queue.
* Use a fixed-number of threads (though even one is actually enough)
to execute the the server functions. If multiple threads are used,
a work-delegation mechanism ensures that the per object order < is
preserved.
For reference, I used the following command to create workloads that
highlight the problem this patch is addressing:
% settrans t .../ext2fs --sync=30 /dev/sd2s1
...
% /usr/bin/time zsh -c 'for ((i=0; i < 1500; i++)); do
dd if=/dev/zero of=t/src/$i bs=4k count=290 2>/dev/null
echo -n .
if ((i % 100 == 0)) ; then echo -n $i; fi
done'
* libpager/queue.h: New file.
* libpager/demuxer.c: Manage a queue of requests received from the
port bucket.
(pager_demuxer): Just decode the server function and enqueue the
request.
(worker_func): New function that consumes and executes the requests
from the queue.
(service_paging_requests): New function.
(pager_start_workers): Likewise.
* libpager/data-request.c: Remove the seqno barriers.
* libpager/data-return.c: Likewise.
* libpager/data-unlock.c: Likewise.
* libpager/chg-compl.c: Likewise.
* libpager/lock-completed.c: Likewise.
* libpager/no-senders.c: Likewise.
* libpager/notify-stubs.c: Likewise.
* libpager/object-init.c: Likewise.
* libpager/object-terminate.c: Likewise.
* libpager/seqnos.c: Remove file.
* libpager/stubs.c: Likewise.
* libpager/pager.h (pager_demuxer): Drop declaration.
(pager_start_workers): New declaration.
* libpager/priv.h: Remove the _pager_seqno declarations.
* libpager/Makefile (SRCS): Drop seqnos.c.
* console/pager.c (user_pager_init): Call pager_start_workers.
* libdiskfs/disk-pager.c: Likewise.
* storeio/pager.c: Likewise.
* ext2fs/pager.c (service_paging_requests): Remove function.
(create_disk_pager): Start separate file pager using
`pager_start_workers'.
* fatfs/pager.c (service_paging_requests): Remove function.
(create_fat_pager): Start separate file pager using
`pager_start_workers'.
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* mach-defpager/default_pager.c (pager_port_list_insert): Set
protected payload.
(pager_port_list_delete): Clear protected payload.
* mach-defpager/mig-decls.h (begin_using_default_pager_payload): New
function.
* mach-defpager/mig-mutate.h: Add mutator.
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* libcons/extra-version.c (cons_extra_version): Add weak attribute.
* libcons/vcons-add.c (cons_vcons_add): Likewise.
* libcons/vcons-remove.c (cons_vcons_remove): Likewise.
* libdiskfs/extra-version.c (diskfs_extra_version): Likewise.
* libdiskfs/get-source.c (diskfs_get_source): Likewise.
* libdiskfs/readonly-changed.c (diskfs_readonly_changed): Likewise.
* libdiskfs/sync-default.c (diskfs_default_sync_interval): Likewise.
* libdiskfs/validate-author.c (diskfs_validate_author_change): Likewise.
* libdiskfs/validate-flags.c (diskfs_validate_flags_change): Likewise.
* libdiskfs/validate-group.c (diskfs_validate_group_change): Likewise.
* libdiskfs/validate-mode.c (diskfs_validate_mode_change): Likewise.
* libdiskfs/validate-owner.c (diskfs_validate_owner_change): Likewise.
* libdiskfs/validate-rdev.c (diskfs_validate_rdev_change): Likewise.
* libnetfs/file-get-storage-info-default.c (netfs_file_get_storage_info):
Likewise.
* libnetfs/get-source.c (netfs_get_source): Likewise.
* libnetfs/set-get-trans.c (netfs_set_translator, netfs_get_translator):
Likewise.
* libtrivfs/get-source.c (trivfs_get_source): Likewise.
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We don't need to call the original function, so a weak attribute is
enough.
* libports/dead-name.c (ports_dead_name): Remove weak alias.
(__ports_dead_name): Rename back to ports_dead_name, but add weak attribute.
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When linking statically, the libports definition would come before the
libdiskfs definition, defeating the purpose of the ports_dead_name
callback.
* libports/dead-name.c (ports_dead_name): Rename into __ports_dead_name.
(ports_dead_name): Add weak alias for __ports_dead_name.
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* libfshelp/translator-list.c (fshelp_set_active_translator): Use common
out path to unlock translator_ihash_lock before exitting on error.
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* exec/elfcore.c (dump_core): Use procinfo_t, which is already a
pointer, instead of procinfo_t*.
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The deallocation also needs to be fixed.
Also, fetch_procinfo already took care of the conversion.
* exec/elfcore.c (dump_core): Fix procinfoCnt taken from
proc_getprocinfo.
* utils/login.c (check_owned): Likewise.
* libps/procstat.c (merge_procinfo): Remove conversion between bytes and
int, already handled by fetch_procinfo.
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The procinfoCnt argument is the number of elements of the procinfo_t array,
not its size in bytes.
* exec/elfcore.c (dump_core): Fix procinfoCnt given to proc_getprocinfo.
* libps/procstat.c (merge_procinfo): Likewise.
* utils/login.c (check_owned): Likewise.
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* pfinet/main.c: Fix path in comment.
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* libports/ports.h (struct port_info): Use the new type.
* libports/lookup-port.c: No need to lock _ports_lock anymore.
* libports/bucket-iterate.c: Likewise.
* libports/complete-deallocate.c: Check if someone reacquired a
reference through a hash table lookup.
* libports/create-internal.c: Use the new reference counting primitives.
* libports/get-right.c: Likewise.
* libports/import-port.c: Likewise.
* libports/port-deref-weak.c: Likewise.
* libports/port-deref.c: Likewise.
* libports/port-ref-weak.c: Likewise.
* libports/port-ref.c: Likewise.
* libports/reallocate-from-external.c: Likewise.
* libports/transfer-right.c: Likewise.
* utils/rpctrace.c: Likewise.
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