and the metadata required to interpret it. Callers of namei must now
create a pathbuf and pass it to NDINIT (instead of a string and a
uio_seg), then destroy the pathbuf after the namei session is
complete.
Update all namei call sites accordingly. Add a pathbuf(9) man page and
update namei(9).
The pathbuf interface also now appears in a couple of related
additional places that were passing string/uio_seg pairs that were
later fed into NDINIT. Update other call sites accordingly.
years ago when the kernel was modified to not alter ABI based on
DIAGNOSTIC, and now just call the respective function interfaces
(in lowercase). Plenty of mix'n match upper/lowercase has creeped
into the tree since then. Nuke the macros and convert all callsites
to lowercase.
no functional change
This fixes a race where, for a short period of time, so->so_lock and
so2->so_lock are not sync. This makes solocked2() and solocked()
unreliable and cause DIAGNOSTIC kernel panics. This also fixes a possible
panic in unp_setaddr() which expects the socket locked.
Should fix kern/38968, fix proposed in
http://mail-index.netbsd.org/tech-kern/2009/08/17/msg005863.html
- Avoid atomics in more places.
- Remove the per-descriptor mutex, and just use filedesc_t::fd_lock.
It was only being used to synchronize close, and in any case we needed
to take fd_lock to free the descriptor slot.
- Optimize certain paths for the <NDFDFILE case.
- Sprinkle more comments and assertions.
- Cache more stuff in filedesc_t.
- Fix numerous minor bugs spotted along the way.
- Restructure how the open files array is maintained, for clarity and so
that we can eliminate the membar_consumer() call in fd_getfile(). This is
mostly syntactic sugar; the main functional change is that fd_nfiles now
lives alongside the open file array.
Some measurements with libmicro:
- simple file syscalls are like close() are between 1 to 10% faster.
- some nice improvements, e.g. poll(1000) which is ~50% faster.
via SCM_RIGHTS messages are dealt with:
1. unp_gc: make this a kthread.
2. unp_detach: go not call unp_gc directly. instead, wake up unp_gc kthread.
3. unp_scan: do not close files here. instead, put them on a global list
for unp_gc to close, along with a per-file "deferred close count". if
file is already enqueued for close, just increment deferred close count.
this eliminates the recursive calls.
3. unp_gc: scan files on global deferred close list. close each file N
times, as specified by deferred close count in file. continue processing
list until it becomes empty (closing may cause additional files to be
queued for close).
4. unp_gc: add additional bit to mark files we are scanning. set during
initial scan of global file list that currently clears FMARK/FDEFER.
during later scans, never examine / garbage collect descriptors that
we have not marked during the earlier scan. do not proceed with this
initial scan until all deferred closes have been processed. be careful
with locking to ensure no races are introduced between deferred close
and file scan.
5. unp_gc: use dummy file_t to mark position in list when scanning. allow
us to drop filelist_lock. in turn allows us to eliminate kmem_alloc()
and safely close files, etc.
6. prohibit transfer of descriptors within SCM_RIGHTS messages if
(num_files_in_transit > maxfiles / unp_rights_ratio)
7. fd_allocfile: ensure recycled filse don't get scanned.
this is 97% work done by andrew doran, with a couple of minor bug fixes
and a lot of testing by yours truly.
- Socket layer becomes MP safe.
- Unix protocols become MP safe.
- Allows protocol processing interrupts to safely block on locks.
- Fixes a number of race conditions.
With much feedback from matt@ and plunky@.
condition), it leaves the control message with file descriptors. Calling
unp_dispose() will interpret the message as containing file pointers
and crash the system.
This change removes unp_dispose() from this failure path and avoids
using goto to jump into switch statements...
The previous workaround to ignore such messages in unp_scan() is removed.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.
quick consensus on tech-kern
it possible to get the pid, euid and egid of the process at the remote
end at the time it did bind() or connect().
Add a new libc function, getpeereid() to easily get at the euid and egid.
As a consequence, bump libc's minor number.
Document the LOCAL_PEEREID socket option in unix(4).
Based on contribution by Arne H. Juul, minor modifications by myself.
do not leak file descriptors when sending a datagram with SCM_RIGHTS
fails. Patch from Gary Thorpe, based on changes in FreeBSD and work
from Christian Biere.
avoid having to allocate space in the 'stackgap'
- which is very LWP unfriendly.
The additional code for non-emulation namei() is trivial, the reduction for
the emulations is massive.
The vnode for a processes emulation root is saved in the cwdi structure
during process exec.
If the emulation root the TRYEMULROOT flag are set, namei() will do an initial
search for absolute pathnames in the emulation root, if that fails it will
retry from the normal root.
".." at the emulation root will always go to the real root, even in the middle
of paths and when expanding symlinks.
Absolute symlinks found using absolute paths in the emulation root will be
relative to the emulation root (so /usr/lib/xxx.so -> /lib/xxx.so links
inside the emulation root don't need changing).
If the root of the emulation would be returned (for an emulation lookup), then
the real root is returned instead (matching the behaviour of emul_lookup,
but being a cheap comparison here) so that programs that scan "../.."
looking for the root dircetory don't loop forever.
The target for symbolic links is no longer mangled (it used to get the
CHECK_ALT_xxx() treatment, so could get /emul/xxx prepended).
CHECK_ALT_xxx() are no more. Most of the change is deleting them, and adding
TRYEMULROOT to the flags to NDINIT().
A lot of the emulation system call stubs could now be deleted.
dholland