One of the features that prevented us from fixing some of the TTY
consumers to work once again, was an interface that allowed consumers to
do the following:
- `Sniff' incoming data, which is used by the snp(4) driver.
- Take direct control of the input and output paths of a TTY, which is
used by ng_tty(4), ppp(4), sl(4), etc.
There's no practical advantage in committing a hooks layer without
having any consumers. In P4 there is a preliminary port of snp(4) and
thompsa@ is busy porting ng_tty(4) to this interface. I already want to
have it in the tree, because this may stimulate others to work on the
remaining modules.
Discussed with: thompsa
Obtained from: //depot/projects/mpsafetty/...
According to style(9), function argument names should only be omitted
for prototypes that are exported to userspace. This means we should
document the function arguments in the TTY header files, because they
are only used in userspace.
While there, change the type of the buffer argument of
ttydisc_rint_bypass() to `const void *' instead of `char *'.
Requested by: attilio
Obtained from: //depot/projects/mpsafetty/...
Because pseudo-terminal master file descriptors no longer have a vnode
underneath, we have to fill in fstat() values ourselves. Make our
implementation somewhat sane by returning the timestamps of the TTY
device node that corresponds with our file descriptor.
Obtained from: //depot/projects/mpsafettty/...
the code to prevent useless waste of space.
- Remove support for quote bits. There is not a single driver that needs
these bits anymore. This means putc() now accepts a char instead of an
int.
- Remove the unneeded catq() and nextc() routines. They were only used
by the old TTY layer.
- Convert the clist code to use ANSI C prototypes.
initialize the vattr structure in VOP_GETATTR() with VATTR_NULL(),
vattr_null() or by zeroing it. Remove these to allow preinitialization
of fields work in vn_stat(). This is needed to get birthtime initialized
correctly.
Submitted by: Jaakko Heinonen <jh saunalahti fi>
Discussed on: freebsd-fs
MFC after: 1 month
NODEV is more appropriate when va_rdev doesn't have a meaningful value.
Submitted by: Jaakko Heinonen <jh saunalahti fi>
Suggested by: bde
Discussed on: freebsd-fs
MFC after: 1 month
VOP_GETATTR() call in vn_stat(). Thus if a file system doesn't
initialize those fields in VOP_GETATTR() they will have a sane default
value.
Submitted by: Jaakko Heinonen <jh saunalahti fi>
Discussed on: freebsd-fs
MFC after: 1 month
initialize va_vaflags and va_spare because they are not part of the
VOP_GETATTR() API. Also don't initialize birthtime to ctime or zero.
Submitted by: Jaakko Heinonen <jh saunalahti fi>
Reviewed by: bde
Discussed on: freebsd-fs
MFC after: 1 month
returning uninitialized birthtime. Most file systems don't initialize
birthtime properly in their VOP_GETTATTR().
Submitted by: Jaakko Heinonen <jh saunalahti fi>
Reviewed by: bde
Discussed on: freebsd-fs
MFC after: 1 month
years by the priv_check(9) interface and just very few places are left.
Note that compatibility stub with older FreeBSD version
(all above the 8 limit though) are left in order to reduce diffs against
old versions. It is responsibility of the maintainers for any module, if
they think it is the case, to axe out such cases.
This patch breaks KPI so __FreeBSD_version will be bumped into a later
commit.
This patch needs to be credited 50-50 with rwatson@ as he found time to
explain me how the priv_check() works in detail and to review patches.
Tested by: Giovanni Trematerra <giovanni dot trematerra at gmail dot com>
Reviewed by: rwatson
Unlike tty_rel_gone() and tty_rel_sess(), the tty_rel_pgrp() routine
does not unlock the TTY. I once had the idea to make the code call
tty_rel_pgrp() and tty_rel_sess(), picking up the TTY lock once. This
turned out a little harder than I expected, so this is how it works now.
It's a lot easier if we just let tty_rel_pgrp() unlock the TTY, because
the other routines do this anyway.
wait until the current suspension is lifted instead of silently returning
success immediately. The consequences of calling vfs_write() resume when
not owning the suspension are not well-defined at best.
Add the vfs_susp_clean() mount method to be called from
vfs_write_resume(). Set it to process_deferred_inactive() for ffs, and
stop calling it manually.
Add the thread flag TDP_IGNSUSP that allows to bypass the suspension
point in the vn_start_write. It is intended for use by VFS in the
situations where the suspender want to do some i/o requiring calls to
vn_start_write(), and this i/o cannot be done later.
Reviewed by: tegge
In collaboration with: pho
MFC after: 1 month
Show the b_dep value for the buffer in the show buffer command.
Add a comand to dump the dirty/clean buffer list for vnode.
Reviewed by: tegge
Tested and used by: pho
MFC after: 1 month
the command set (only so long as the module is present):
o add db_command_register and db_command_unregister to add and remove
commands, respectively
o replace linker sets with SYSINIT's (and SYSUINIT's) that register
commands
o expose 3 list heads: db_cmd_table, db_show_table, and db_show_all_table
for registering top-level commands, show operands, and show all operands,
respectively
While here also:
o sort command lists
o add DB_ALIAS, DB_SHOW_ALIAS, and DB_SHOW_ALL_ALIAS to add aliases
for existing commands
o add "show all trace" as an alias for "show alltrace"
o add "show all locks" as an alias for "show alllocks"
Submitted by: Guillaume Ballet <gballet@gmail.com> (original version)
Reviewed by: jhb
MFC after: 1 month
all the non-filter handlers attached to an interrupt event. This can be
used by device drivers which multiplex their interrupt onto the interrupt
handlers for child devices.
the free list and in this way avoid contention on the w_mtx.
In order to make the code simple, we rely on the rule that when the head
has not a child it also doesn't have other subsequent entries.
Actually this assertion is broken because we can free all the head
children and quit witness_unlock() with the head still allocated, with no
children and subsequent entries present.
Fix this by shifting the head if other entries are present and still
freeing the object, but leaving always an head.
- Fix witness_thread_has_locks() in order to report, correctly, if the
lock list linked to a specific thread has children or not based on the
above explained rule.
- Fix a printout into DDB's "show alllocks" command in order to show,
correctly, the process name that is really what we want.
- Fix style(9) for a comment.
Tested by: Giovanni Trematerra <giovanni dot trematerra at gmail dot com>
Reported by: Marko Kiiskila <marko dot kiiskila at nokia dot com>
Sponsored by: Nokia
ttydevsw_outwakeup(). This should fix panics which occur after remote
login sessions timeout during moderate TTY activity. An example of
where this might occur is where a pending write to the terminal is
occurring while sshd(8) is shutting down the TTY after a TCP timeout.
Submitted by: ed
of spurious witness warnings since lockmgr grew witness support. Before
this, every time you passed an interlock to a lockmgr lock WITNESS treated
it as a LOR.
Reviewed by: attilio
- Set UMA_ZONE_NOFREE so that the per-turnstile spin locks are type stable
to avoid a race where one thread might dereference a lock in a free'd
turnstile that was previously used by another thread.
Theorized by: tegge (2)
MFC after: 1 week
it had been assigned to the last sleeping thread. That thread might have
started running on another CPU and have reused that sleep queue. Fix it
by just walking the thread queue using TAILQ_FOREACH_SAFE() rather than
a while loop.
PR: amd64/124200
Discovered by: tegge
Tested by: benjsc
MFC after: 1 week
somehow.
As a consequence we may now get an unexpected result(*).
Catch that error cases with a well defined panic giving appropriate
pointers to ease debugging.
(*) While the concensus was that the case should never happen unless
there was a bug, noone was definitively sure.
Discussed with: kmacy (about 8 months back)
Reviewed by: silby (as part of a larger patch in March)
MFC after: 2 months
As discussed with Robert on IRC, checking the permissions on
/dev/console to see if we can call TIOCCONS could be unreliable. When we
run a chroot() without a devfs instance mounted inside, it won't
actually check the permissions on the device node inside the devfs
instance.
Using the already existing PRIV_TTY_CONSOLE for this seems like a better
idea.
Approved by: rwatson
As reported by several users on the mailing lists, applications like
screen(1) fail to properly handle ^S and ^Q characters. This was because
MPSAFE TTY didn't implement packet mode (TIOCPKT) yet. Add basic packet
mode support to make these applications work again.
Obtained from: //depot/projects/mpsafetty/...
When I migrated tty_compat.c to MPSAFE TTY, I just hooked it up to the
build and fixed it until it compiled and somewhat worked. It turns out
this was not the smartest thing, because the old TTY layer also had a
field called t_flags, which contained a set of sgtty flags.
This means our current COMPAT_43TTY code overwrites the TTY flags,
causing all strange problems to occur. Fix this code to use a new struct
member called t_compatflags. This commit may cause kern/127054 to be
fixed, but this still has to be tested/confirmed by the originator. It
has to be fixed anyway.
PR: kern/127054
The ttydisc_getc() routine obtains a read length from ttyoutq_read().
For no valid reason, the current code stores this value in an int, and
returns a size_t. There is no need to perform this useless conversion.
Obtained from: //depot/projects/mpsafetty/...
lock tracking and checks, doing just the former ones.
- Fix a bug where sysctl utility was printing crazy values when setting a
new value for debug.witness.watch [0]
[0] Reported by: yongari
- In the current design, when a TTY decreases its baud rate, it tries to
shrink the queues. This may not always be possible, because it will
not free any blocks that are still filled with data.
Change the TTY queues to store a `quota' value as well, which means it
will not free any blocks when changing the baud rate, but when placing
blocks back into the queue. When the amount of blocks exceeds the
quota, they get freed.
It also fixes some edge cases, where TIOCSETA during read()/
write()-calls could actually make the queue a tiny bit bigger than in
normal cases.
- Don't leak blocks of memory when calling TIOCSETA when the device
driver abandons the TTY while allocating memory.
- Create ttyoutq_init() and ttyinq_init() to initialize the queues,
instead of initializing them by hand. The new TTY snoop driver also
creates an outq, so it's good to have a proper interface to do this.
Obtained from: //depot/projects/mpsafetty/...
1 means that witness is up and running.
0 means that witness is disabled but that it can be established later
again in effective way.
-1 means that witness is disabled permanently
- Fix a bug causing kernel to panic on witness disabling through
witness_watch. lock lists queues were still full of entries and this was
causing throubles with debugging stubs (like witness_thread_exit()).
Reported by: kris, yongari
Sponsored by: Nokia
- Implement IMAXBEL. It turned out the IMAXBEL termios switch was marked
as supported, while it had not been implemented.
- Don't go into the high watermark when in canonical mode, no data has
been canonicalized and the input buffer is full. This caused the
terminal to lock up. This prevented users from pressing
backspace/^U/etc in such cases.
This could easily be simulated by pasting a very big amount of data in
a shell with sh(1) in canonical mode.
Obtained from: //depot/projects/mpsafetty/...
A couple of months ago I was quite impressed, because when I was writing
code, I discovered that uiomove() would not allow any locks to be held,
while ureadc() did, mainly because ureadc() is implemented using the
same building blocks as uiomove().
Let's see if this triggers any aditional witness warnings on our source
tree.
Reviewed by: atillio
