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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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* utils/mount.c (parse_opt): Add -B/--bind/--firmlink/-o bind mount
options. (do_mount): Do not pass bind mount option to settrans, set
firmlink fstype. (main): Likewise.
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According to f2640263468aced5c91ac5fc1f15bb5691f7eb20, passive
translators are no longer removed.
* utils/umount.c (do_umount) Remove -p option from verbose message.
(passive_flags): Remove.
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* libdiskfs/lookup.c (cache_misses): Remove.
(cm_lock): Likewise.
(diskfs_lookup): Do not count cache misses.
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Previously, libports used a hash table per port bucket. This makes
looking up a port difficult if one does not know the port bucket, as
one has to iterate over all buckets and do a hash table lookup each.
Having to iterate over the buckets makes it necessary to keep a list
of all buckets, which has to be updated and protected by a lock as
well.
Also, the current code in _ports_bucket_class_iterate iterates over
the hash table associated with the bucket given. When
ports_class_iterate calls this common function, it obtains a reference
to the bucket from one of the ports in the given class. This will not
work if a class contains ports in different port buckets. This
limitation is not documented as far as I can see. Again, having to
maintain this list has its cost and requires serialization.
Use a global hash table for lookups instead. Keep the per-bucket hash
tables for efficient iteration over buckets. Furthermore, serialize
access to all hash tables using a separate lock. Remove the linked
lists of all buckets and all ports in a class.
* libports/bucket-iterate.c (ports_bucket_iterate): Acquire
_ports_htable_lock. Also, generalize ports_bucket_iterate so that it
takes a pointer to a hash table as first argument.
(ports_bucket_iterate): Ajust call to former function accordingly.
* libports/class-iterate.c (ports_class_iterate): Just call the
generalized _ports_bucket_class_iterate with the global hash table as
argument.
* libports/ports.h (struct port_info): Remove the port class links.
(struct port_bucket): Remove the hash table, and the all buckets link.
(_ports_all_buckets): Remove declaration.
(_ports_htable): New global hash table.
(_ports_htable_lock): Protected by this lock.
* libports/claim-right.c: Adjust accordingly.
* libports/complete-deallocate.c: Likewise.
* libports/create-bucket.c: Likewise.
* libports/create-class.c: Likewise.
* libports/create-internal.c: Likewise.
* libports/destroy-right.c: Likewise.
* libports/import-port.c: Likewise.
* libports/lookup-port.c: Likewise.
* libports/reallocate-from-external.c: Likewise.
* libports/reallocate-port.c: Likewise.
* libports/transfer-right.c: Likewise.
* libports/inhibit-all-rpcs.c: Iterate over the hash table.
* libports/inhibit-bucket-rpcs.c: Likewise, but filter using bucket.
* libports/inhibit-class-rpcs.c: Likewise, but filter using class.
* libports/init.c (_ports_htable): Initialize.
(_ports_htable_lock): Likewise.
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* procfs/rootdir.c: Move the translator linkage code to the
appropriate location.
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Generalize the translator linkage code previously introduced for the
`mounts' node.
* procfs/rootdir.c (struct procfs_translated_node_ops): New
specialized node operations structure for translated nodes.
(rootdir_mounts_make_node): Generalize and rename to
rootdir_make_translated_node. Also, pass the entry_hook to
procfs_make_node so that...
(rootdir_mounts_get_translator): ... can be generalized to
rootdir_translated_node_get_translator and read the argz vector from
the hooked structure.
(ROOTDIR_DEFINE_TRANSLATED_NODE): New convenience macro to define
translated nodes.
(rootdir_entries): Use the new code for the `mounts' node.
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Now that procfs is merged into the Hurd repository we can just assume
that the mtab translator exists.
* procfs/rootdir.c (rootdir_mounts_exists): Drop function.
(rootdir_entries): Adjust accordingly.
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* procfs/rootdir.c (rootdir_gc_filesystems): New function.
(rootdir_entries): Use the new function to implement /proc/filesystems.
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Fixes https://savannah.gnu.org/bugs/?32770 .
* procfs/process.c (process_file_gc_maps): New function.
(entries): Use the new function to implement /proc/N/maps.
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This prevents load_section from mapping any sections to page zero.
* exec/exec.c (do_exec): Redzone page zero before loading anything.
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If the device master port is given, a boot-time exec server can print
diagnostic messages earlier.
* exec/main.c (opt_device_master): New variable.
(OPT_DEVICE_MASTER_PORT): New macro.
(options): New set of options.
(parse_opt): New function.
(trivfs_append_args): Likewise.
(argp): Pull the argp definition out of main.
(trivfs_runtime_argp): Set, so that we respond properly to fsysopts.
(open_console): Pull the code out of S_exec_init and generalize it.
(main): Call open_console if a device master port is given.
(S_exec_init): Call open_console.
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Cherry-picked from Linux c1e9dcb37795b08a1f50b8de7b2ad5efcb15728f
* pfinet/linux-src/net/ipv4/af_inet.c (inet_getname): Clear `sin_zero'
part of `sin'.
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* hurd/paths.h (_HURD_MTAB): New macro.
* procfs/rootdir.c (rootdir_mounts_get_translator): Use the new macro.
(rootdir_mounts_exists): Likewise.
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* procfs/process.c (process_stat_make_node): Fix typo in comment.
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Fixes https://savannah.gnu.org/bugs/?15806 .
* trans/hello-mt.c (trivfs_append_args): Escape contents.
* trans/hello.c (trivfs_append_args): Likewise.
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Make the memory_object parameter of default_pager_object_create
polymorphic. This fixes https://savannah.gnu.org/bugs/?26751 .
* hurd/default_pager.defs (default_pager_object_create): Make
memory_object parameter polymorphic.
* mach-defpager/default_pager.c (S_default_pager_object_create):
Adjust accordingly.
* trans/proxy-defpager.c (S_default_pager_object_create): Likewise.
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* libdiskfs/boot-start.c (diskfs_start_bootstrap): Pass retry_name to
dir_lookup, which is later checked to be the empty string.
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* include/refcount.h (refcount_init): There must be at least one
reference at initialization time.
(refcounts_init): Likewise.
(refcount_unsafe_ref): New function retaining the previous
functionality of refcount_ref. It is occasionally useful to raise the
reference count again after it dropped to zero.
(refcounts_unsafe_ref): Likewise.
(refcounts_unsafe_weak_ref): Likewise.
(refcount_ref): Detect use-after-free errors.
(refcounts_ref): Likewise.
(refcounts_ref_weak): Likewise.
* libtrivfs/protid-clean.c (trivfs_clean_protid): Use refcount_unsafe_ref.
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When first introduced as fsys_get_children, it made sense to return
the list of children using paths relative to the root of the
filesystem that was queried. Making the get_children method part of
the fsys protocol was a mistake that has since been corrected in
9366d6b2.
Instead of returning paths relative to the root of the translator,
return paths relative to the path of the receiving node.
This fixes a problem with the mtab translator. Previously, the mtab
translator invoked on a target that was not the root directory of a
translator would compute invalid paths, e.g.:
/hurd/mtab: /any/path/servers/socket/26 No such file or directory
* hurd/fs.defs (file_get_children): Update comment.
* libfshelp/translator-list.c (fshelp_get_active_translators): Add
argument PREFIX. Filter entries not beginning with PREFIX if
non-NULL, and omit PREFIX from the returned paths.
* libfshelp/fshelp.h (fshelp_get_active_translators): Update comment
accordingly. Also clarify that both FILTER and PREFIX can be NULL.
* libdiskfs/file-get-children.c (diskfs_S_file_get_children): Update
comment, pass prefix to fshelp_get_active_translators.
* libnetfs/file-get-children.c (netfs_S_file_get_children): Likewise.
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* libihash/ihash.h (HURD_IHASH_ITERATE): Fix comparison between signed
and unsigned integer expressions.
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* trans/mtab.c (main): Use setnullauth to drop privileges.
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* libtrivfs/protid-clean.c (trivfs_clean_protid): Fix typo.
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