indicating an unhandled "command". ERESTART is -1, which can lead to
confusion. ERESTART has been moved to -3 and EPASSTHROUGH has been
placed at -4. No ioctl code should now return -1 anywhere. The
ioctl() system call is now properly restartable.
on the <bsd-api-discuss@wasabisystems.com> mailing list. PT_IO
is a more general inferior I/D space I/O mechanism. FreeBSD and
OpenBSD have also added PT_IO.
From lha@stacken.kth.se, kern/15945.
back in rev. 1.51, bread() and breadn() were changed to assume that
if B_DONE is set on a buffer returned by bio_doread(), that the buffer
must have already been in the cache, and thus the overall bread() should
return success. but if the requested buffer is not in the cache and
is past the end of the device, bounds_check_with_label() will set B_ERROR
on the buffer and the caller will call biodone(), which will cause bread()
to think the buffer was already in the cache and thus return success.
to fix this, undo rev. 1.51 and instead have biowait() treat both B_DONE
and B_DELWRI as indicators that it doesn't need to sleep waiting for an
i/o to complete.
Changes:
* MP locking changes (mostly FreeBSD specific)
XXXSMP the MP locking macros are noops on NetBSD for now
* kevent fix (FreeBSD rev. 1.87): when the last reader/writer
disconnects, ensure that anybody who is waiting for the kevent
on the other end of the pipe gets EV_EOF
* kill __P
first. This is necessary to avoid warnings with -fshort-enums. Casting
to an int really should be enough, but turns out not to be.
This change will be documented in doc/HACKS.
m_reclaim() to match the drain hook signature. This allows us to
delete m_retry() and m_retryhdr(), as the pool allocator will now
perform the reclaimation step for us.
From art@openbsd.org.
and the latter, while there was some code tested the bit, was woefully
incomplete and also unused by anything. Besides, PR_STATIC functionality
could be better handled by backend allocators anyhow.
From art@openbsd.org
pool_set_drain_hook(). This hook is called in three cases:
* When a pool has hit the hard limit, just before either erroring
out or sleeping.
* When a backend allocator fails to allocate memory.
* Just before trying to reclaim pages in pool_reclaim().
This hook requests the client to try and free some items back to
the pool.
From art@openbsd.org.
deal with shortages of the VM maps where the backing pages are mapped
(usually kmem_map). Try to deal with this:
* Group all information about the backend allocator for a pool in a
separate structure. The pool references this structure, rather than
the individual fields.
* Change the pool_init() API accordingly, and adjust all callers.
* Link all pools using the same backend allocator on a list.
* The backend allocator is responsible for waiting for physical memory
to become available, but will still fail if it cannot callocate KVA
space for the pages. If this happens, carefully drain all pools using
the same backend allocator, so that some KVA space can be freed.
* Change pool_reclaim() to indicate if it actually succeeded in freeing
some pages, and use that information to make draining easier and more
efficient.
* Get rid of PR_URGENT. There was only one use of it, and it could be
dealt with by the caller.
From art@openbsd.org.
header to distinguish between o32, n32 and n64 ABIs. We now use this.
This suppress the need of the mips_option test, which had some fake positive.
This also removes the mandatory ordering of n32 vs o32 in the exec switch
(exec_conf.c)
since bounds_check_with_label() will truncate a buffer that crosses
the end of the partition. adjust the assertion to account for this.
fixes PRs 7938, 12156, 12698, 13076, 13210 and 13288.
rounded up to respect boundary limits, adjust newstart and last before
skiping to the next region. Otherwise we may check the same candidate
region against the start of the next region, no the one immediatly following
the hole, leading to corrupted map.
This fixes the panic seen on sparc64 with scsi drivers, and probably fixes
PR 15489.
easy, convenient dropping into DDB at the "root device: " prompt.
Useful if your console can't do it w/o actually taking an interrupt
and you want to, say, look at the boot messages.
jdolecek