This used to make syscons switch to vty0 when we entered DDB but this
was lost in the KDB shuffle. We may want to bring it back down the road
but it should be done by calling cn_init_t/cn_term_t instead, possibly
with a flag argument saying "Debugger!"
sendfile(). This causes sendfile() to use the file descriptor
reference to the socket instead of bumping the socket reference
count, which avoids an additional refcount operation, as well as a
potential expensive socket refcount drop, which can lead to
contention on the accept mutex. This change also has the side
effect of further reducing the number of cases where an in-progress
I/O operation can occur on a socket after close, as using the file
descriptor refcount prevents the socket from closing while in use.
MFC after: 3 months
If B_NOCACHE is set the pages of vm backed buffers will be invalidated.
However clean buffers can be backed by dirty VM pages so invalidating them
can lead to data loss.
Add support for flush dirty page in the data invalidation function
of some network file systems.
This fixes data losses during vnode recycling (and other code paths
using invalbuf(*,V_SAVE,*,*)) for data written using an mmaped file.
Collaborative effort by: jhb@,mohans@,peter@,ps@,ups@
Reviewed by: tegge@
MFC after: 7 days
stopped before adjusting their priority and setting them on the run
q so they cannot race for resources (pointed out by njl).
While here add a console printf on thread create fails; otherwise
noone may notice (e.g. return value is always 0 and caller has no
way to verify).
Reviewed by: jhb, scottl
MFC after: 2 weeks
mount(2) system call:
* Add cmount hook to fdescfs and pseudofs (and, by extension, procfs and
linprocfs). This (mostly) restores the ability to mount these
filesystems using the old mount(2) system call (see below for the
rest of the fix).
* Remove not-NULL check for the data argument from the mount(2) entry
point. Per the mount(2) man page, it is up to the individual
filesystem being mounted to verify data. Or, in the case of procfs,
etc. the filesystem is free to ignore the data parameter if it does
not use it. Enforcing data to be not-NULL in the mount(2) system call
entry point prevented passing NULL to filesystems which ignored the
data pointer value. Apparently, passing NULL was common practice
in such cases, as even our own mount_std(8) used to do it in the
pre-nmount(2) world.
All userland programs in the tree were converted to nmount(2) long ago,
but I've found at least one external program which broke due to this
(presumably unintentional) mount(2) API change. One could argue that
external programs should also be converted to nmount(2), but then there
isn't much point in keeping the mount(2) interface for backward
compatibility if it isn't backward compatible.
When porting FreeBSD to a new platform, one of the more useful things to do is
get mi_startup() to let you know which SYSINIT it's up to. Most people tend to
whack a printf in the SYSINIT loop to print the address of the function it's
about to call. Going one better, jhb made a version that uses DDB to look up
the name of the function and print that instead. This version is essentially
his with the addition of some ifdeffery to make it optional and to allow it to
work (although using only the function address, not the symbol) if you forgot
to enable DDB.
All the cool bits by: jhb
Approved by: scottl, rink, cognet, imp
vn_start_write() is always called earlier in the code path and calling
the function recursively may lead to a deadlock.
Confirmed by: tegge
MFC after: 2 weeks
vn_finished_write() should also be called only then.
BTW. I fixed two functions here: vn_rdwr() and vn_write(). The latter seems
to be unused.
MFC after: 3 weeks
buffers to go on the buf daemon's DIRTYGIANT queue.
- Set BO_NEEDSGIANT on ffs's devvp since the ffs_copyonwrite handler
runs in the context of the buf daemon and may require Giant.
than trying to optimize it into a single lock. This adds more calls to
lock giant with non smpsafe filesystems but is the only way to reliably
hold the correct lock.
- Remove an invalid assert in the mountedhere case in lookup and fix the
code to properly deal with the scenario. We can actually have a lookup
that returns dp == dvp with mountedhere set with certain unmount races.
Tested by: kris
Reported by: kris/mohans
problems in ddb:
- "show threadchain [thread]" will start with the specified thread (or the
current kdb thread by default) and show it's state. If it is blocked on
a lock, it will find the owner of the lock and show its state, etc.
- "show allchains" will find all of the threads that are blocked on a
lock (but do not have any threads blocked on a lock they hold) and show
the resulting thread chain.
- "show lockchain <lock>" takes a pointer to a lock_object (such as a
mutex or rwlock). If there is a turnstile for that lock, then it will
display all the threads blocked on the lock. In addition, for each
thread blocked on the lock, it will display any contested locks they
hold, and recurse on those locks to show any threads blocked on those
locks, etc.
file lock, in the style of fgetsock().
Modify accept1() to use getsock() instead of fgetsock(), relying on the
file descriptor reference rather than an acquired socket reference to
prevent the listen socket from being destroyed during accept(). This
avoids additional reference count operations, which should improve
performance, and also avoids accept1() operating on a socket whose file
descriptor has been torn down, which may have resulted in protocol
shutdown starting.
MFC after: 3 months
function along with the remainder of the reference checking code. Move
comment from body to header with remainder of comments. Inclusion of a
socket in a completed connection queue counts as a true reference, and
should not be handled as an under-documented edge case.
MFC after: 3 months
locked. In general the adaptive spinning is similar to the same code
for mutexes with some extra trickiness in rw_wunlock_hard(). Specifically,
even though both wait bits might be set and we might have a turnstile with
at least one waiting thread, there might not be any threads blocked on the
queue we are not waking up (they might all be spinning), and we should
only preserve the waiting flag for the queue we aren't waking up if there
are in fact threads blocked on that queue. Secondly, there might not be
any threads blocked on the queue we have chosen to waken threads from
(there might only be threads blocked on the other queue and the threads
for this queue are all spinning) in which case we disown the turnstile
instead of doing a braodcast and unpend.
