remove the unconditional acquisition of Giant for extended attribute related
operations. If the file system is set as being MP safe and debug.mpsafevfs is
1, do not pickup Giant.
Mark the following system calls as being MP safe so we no longer pickup Giant
in the system call handler:
o extattrctl
o extattr_set_file
o extattr_get_file
o extattr_delete_file
o extattr_set_fd
o extattr_get_fd
o extattr_delete_fd
o extattr_set_link
o extattr_get_link
o extattr_delete_link
o extattr_list_file
o extattr_list_link
o extattr_list_fd
-Pass MPSAFE flags to namei(9) lookup and introduce vfslocked variable which
will keep track of any Giant acquisitions.
-Wrap any fd operations which manipulate vnodes in VFS_{UN}LOCK_GIANT
-Drop VFS_ASSERT_GIANT into function which operate on vnodes to ensure that
we are sufficiently protected.
I've tested these changes with various TrustedBSD MAC policies which use
extended attribute a lot on SMP and UP systems (thanks to Scott Long for
making some SMP hardware available to me for testing).
Discussed with: jeff
Requested by: jhb, rwatson
of bus tag+handle.
Instead of
bus_space_write_1(sc->tag, sc->handle, ...)
this macros offer
bus_write_1(sc->resource, ...)
The name+argument transformation is constant and the the macros are
generated (by hand) by the script in tools/bus_macro.sh.
The external part is still called 'struct resource' but the contents
is now visible to drivers etc. This makes it part of the device
driver ABI so it not be changed lightly. A comment to this effect
is in place.
The internal part is called 'struct resource_i' and contain its external
counterpart as one field.
Move the bus_space tag+handle into the external struct resource, this
removes the need for device drivers to even know about these fields
in order to use bus_space to access hardware. (More in following commit).
and bus_free_resources(). These functions take a list of resources
and handle them all in one go. A flag makes it possible to mark
a resource as optional.
A typical device driver can save 10-30 lines of code by using these.
Usage examples will follow RSN.
MFC: A good idea, eventually.
attribute memory at 0xff0 to find its MAC address. This is another
instance of the IBM ethercard II from all apperances (short of popping
the lid). Update the entry to document which cards we support
actually need this functionality.
slots to probe. Problems have been reported in this area, lets hope this
bandaid helps.
!! Owners of EISA-equipped Alpha machines are requested to at least
!! boot-test a 6-BETA build and report back to the Alpha list. Thanks!
Approved by: re (scottl)
Suggested by: ticso
---snip---
FYI this bit isn't needed for FreeBSD - I think it came from either
OpenBSD or NetBSD where arc4random() wasn't available during cold
boot.
---snip---
Explained by: iedowse
when we mount and get zero cost if no rules are used in a mountpoint.
Add code to deref rules on unmount.
Switch from SLIST to TAILQ.
Drop SYSINIT, use SX_SYSINIT and static initializer of TAILQ instead.
Drop goto, a break will do.
Reduce double pointers to single pointers.
Combine reaping and destroying rulesets.
Avoid memory leaks in a some error cases.
o Don't reinitialise the atfork() handler list in the child. We
are meant to call the child handler, and on subsequent fork()s
should call all three functions as normal.
o Don't reinitialise the thread specific keyed data in the
child after a fork. Applications may require this for context.
o Reinitialise curthread->tlflags after removing ourselves from
(and reinitialising) the various internal thread lists.
o Reinitialise __malloc_lock in the child after fork() (to balance
our explicitly taking the lock prior to the fork()).
With these changes, it is possible to enable the NOTYET code in
thr_kern.c to allow the use of non-async-safe functions after
fork()ing from a threaded program.
Reviewed by: Daniel Eischen <deischen@freebsd.org>
[_malloc_lock reinitialisation has since been moved to avoid polluting the
!NOTYET code]
module is loaded or compiled into the kernel.
This is useful mostly in startup scripts, when module should be loaded only
if it wasn't compiled into the kernel nor already loaded, eg.:
kldstat -q -m g_eli || kldload geom_eli.ko || err 1 'geom_eli module failed to load.'
in rev. 1.40 of ufs_inode.c, which allows an inode being truncated
even when the filesystem itself is marked RDONLY. A subsequent
call of UFS_TRUNCATE (ffs_truncate) would panic the system as it
asserts that it can only be called when the filesystem is mounted
read-write (same changeset, rev. 1.74 of sys/ufs/ffs/ffs_inode.c).
Because ffs_mount() already takes care of sync'ing the filesystem
to disk before being downgraded to readonly, it appears to be more
desirable that we should not permit this sort of writes to disk.
This change would fix a panic that occours when read-only mounted
a corrupted filesystem and doing some file operations.
MT6/5/4 candidate
Reviewed by: mckusick
It confuses the lock manager since in some places thread0 is
then used for vnode locking while curthread is used for vnode unlocking.
Found by: Yahoo!
Reviewed by: ps@,jhb@
MFC after: 3 days
(not in mdoc(7) sense yet) in ifconfig(8) manpage, create such
subsections for gif(4) and vlan(4) so that their specific
options are not mixed up with general options.
underlying the POSIX fifo implementation. In 6.x/7.x, fifo access is
moved from the VFS layer, where it was serialized using the vnode
lock, to the file descriptor layer, where access is protected by a
reference count but not serialized. This exposed socket buffer
locking to high levels of parallelism in specific fifo workloads, such
as make -j 32, which expose as yet unresolved socket buffer bugs.
fi_sx re-adds serialization about the read and write routines,
although not paths that simply test socket buffer mbuf queue state,
such as the poll and kqueue methods. This restores the extra locking
cost previously present in some cases, but is an effective workaround
for the instability that has been experienced. This workaround should
be removed once the bug in socket buffer handling has been fixed.
Reported by: kris, jhb, Julien Gabel <jpeg at thilelli dot net>,
Peter Holm <peter at holm dot cc>, others
MFC after: 3 days
