have beem moved from pv_flags in struct pv_entry to pvh_attrs in
struct vm_page_md, so no need to copy pv_flags to keep these flags
in pv header in pmap_remove_pv(). Pointed out by uebayasi@ on port-mips.
Also rename those page attribute flags from PV_FOO to PGA_FOO like alpha.
While here, make pv_flags unsigned.
Briefly tested on sgimips O2.
1) expose the built-in limits to user-land (via envstat(8)), and
2) allow user-specified limits to override the built-in limits.
No comments received from current-users@ over 2-week period.
of "starting in N" and eliminate a use of sprintf. Note that on
some rare machines it can be that the BIOS does not provide the delay
function. On such machines the countdown will almost immediately count down
to zero display "starting in 0 seconds."; apparently the net4801 is such a
machine.
Feedback, ideas, and inspiration from tron, ok tron/tonnerre
check_console, veriexecclose, veriexec_delete, veriexec_file_add,
emul_find_root, coff_load_shlib (sh3 version), coff_load_shlib,
compat_20_sys_statfs, compat_20_netbsd32_statfs,
ELFNAME2(netbsd32,probe_noteless), darwin_sys_statfs,
ibcs2_sys_statfs, ibcs2_sys_statvfs, linux_sys_uselib,
osf1_sys_statfs, sunos_sys_statfs, sunos32_sys_statfs,
ultrix_sys_statfs, do_sys_mount, fss_create_files (3 of 4),
adosfs_mount, cd9660_mount, coda_ioctl, coda_mount, ext2fs_mount,
ffs_mount, filecore_mount, hfs_mount, lfs_mount, msdosfs_mount,
ntfs_mount, sysvbfs_mount, udf_mount, union_mount, sys_chflags,
sys_lchflags, sys_chmod, sys_lchmod, sys_chown, sys_lchown,
sys___posix_chown, sys___posix_lchown, sys_link, do_sys_pstatvfs,
sys_quotactl, sys_revoke, sys_truncate, do_sys_utimes, sys_extattrctl,
sys_extattr_set_file, sys_extattr_set_link, sys_extattr_get_file,
sys_extattr_get_link, sys_extattr_delete_file,
sys_extattr_delete_link, sys_extattr_list_file, sys_extattr_list_link,
sys_setxattr, sys_lsetxattr, sys_getxattr, sys_lgetxattr,
sys_listxattr, sys_llistxattr, sys_removexattr, sys_lremovexattr
All have been scrutinized (several times, in fact) and compile-tested,
but not all have been explicitly tested in action.
XXX: While I haven't (intentionally) changed the use or nonuse of
XXX: TRYEMULROOT in any of these places, I'm not convinced all the
XXX: uses are correct; an audit might be desirable.
case functionality of namei in a simple package with only a couple flags.
A substantial majority of the namei call sites in the kernel can use
this interface; this will isolate those areas from the changes arising
as the internals of namei are fumigated.
activity of other threads will perform the TLB flush for the processes using
emap as a side effect. To track that, global and per-CPU generation numbers
are used. This idea was suggested by Andrew Doran; various improvements to
it by me. Notes:
- For now, zero-copy on pipe is not yet enabled.
- TCP socket code would likely need more work.
- Additional UVM loaning improvements are needed.
Proposed on <tech-kern>, silence there.
Quickly reviewed by <ad>.
- Move clearing of interrupts to before atastart() is called in the
xfer interrupt handler. Should fix kern/41579.
- Using cv_timedwait(9) is not possible in code that can be called from
interrupt context, fall back to DELAY(9).
- Correctly poll Port Slot Status register for soft reset PRBs.
- Only use the Recive Transfer Count register on reads, when it is valid.
- Activate PRBs in a way that takes the whole physical address into account,
even when the PRB is beyond 4GiB.
- consistently use DELAY(9)
- Use DELAY() constants in completion polling loops that are consistent with
the loop count limit. (i.e. timeout in 10 rather than 100 seconds)
- Limit accesses to the size of the volume.
This fixes a KASSERT in physio_biodone().
- Change dm_table_size() to return the size of the volume in
DEV_BSIZE units. It was reporting it in DEV_BSIZE^2 units.
- Remove a bit of trailing whitespace.
ok haad
filesystems and (pseudo-)devices, according to the algorithm at A3
and A4, below.
Proposed and discussed at
<http://mail-index.netbsd.org/tech-kern/2009/04/20/msg004864.html>. No
objections.
During an emergency shutdown (e.g., shutdown -n, or after a panic),
shutdown is simple as always: filesystems are not sync'd or unmounted,
and devices are not detached.
It was necessary to change the order of operations during shutdown,
but the new order is more sensible: if a core dump is desired, then
cpu_reboot(9) dumps it first. cpu_reboot(9) does not call legacy
shutdown hooks any longer: they can interfere with device detachment
and PMF shutdown, and very few legacy hooks remain.
Here is the old order of operations:
B1 sync filesystems and TOD clock
B2 unmount filesystems
B3 dump core
B4 detach devices
B5 run legacy shutdown hooks
B6 run PMF shutdown hooks
B7 suspend interrupts
B8 MD reboot/shutdown/powerdown
And here is the new order:
A1 dump core
A2 sync filesystems and TOD clock
A3 unmount one or more filesystems OR
detach one or more devices OR
forcefully unmount one filesystem OR
skip to 5
A4 repeat at 3
A5 run PMF shutdown hooks
A6 suspend interrupts
A7 MD reboot/shutdown/powerdown
Tested on Dell Dimension 3000, Dell PowerEdge 1950, Sun Fire V120,
Soekris net4521 and net4801.
VS: ----------------------------------------------------------------------
(void *)pew is one way to get a struct work *, but let's
write&pew->pew_work, instead. It is more defensive and persuasive.
Make miscellaneous changes in support of tearing down arbitrary
stacks of filesystems and devices during shutdown:
1 Move struct shutdown_state, shutdown_first(), and shutdown_next(),
from kern_pmf.c to subr_autoconf.c. Rename detach_all() to
config_detach_all(), and move it from kern_pmf.c to subr_autoconf.c.
Export all of those routines.
2 In pmf_system_shutdown(), do not suspend user process scheduling, and
do not detach all devices: I am going to do that in cpu_reboot(),
instead. (Soon I will do it in an MI cpu_reboot() routine.) Do still
call PMF shutdown hooks.
3 In config_detach(), add a DIAGNOSTIC assertion: if we're exiting
config_detach() at the bottom, alldevs_nwrite had better not be 0,
because config_detach() is a writer of the device list.
4 In deviter_release(), check to see if we're iterating the device list
for reading, *first*, and if so, decrease the number of readers. Used
to be that if we happened to be reading during shutdown, we ran the
shutdown branch. Thus the number of writers reached 0, the number
of readers remained > 0, and no writer could iterate again. Under
certain circumstances that would cause a hang during shutdown.
filesystem is mounted. Synchronize access to the number with a
mutex. When a struct mount, mp, is allocated, assign the current
generation number to mp->mnt_gen. Introduce vfs_unmount_forceone()
that forcefully unmounts the most recently mounted filesystem.
Refactor: extract vfs_shutdown1() from vfs_shutdown(). Extract
vfs_sync_all() from vfs_shutdown1().
Print more progress indications while we're unmounting all of the
filesystems during shutdown.
We increase the reference count on mp before calling dounmount(mp),
but we do not decrease it if dounmount(mp) fails, and neither does
dounmount(mp). So decrease the reference count if dounmount(mp)
fails.
Change the loop terminating condition in vfs_unmountall1() to (mp
!= (void *)&mountlist) from !CIRCLEQ_EMPTY(&mountlist), because we
may not ever empty the list, especially if we're not forcing the
filesystems to unmount.
Ott: every ioctl but SIOCSIFFLAGS fails with ENXIO (Device not
configured). Let ioctls complete even if initialization is not
complete (!sc->attached). Do exit immediately from zyd_newstate
with ENXIO if !sc->attached, however: zyd_newstate tries to call
some USB routines for which it is probably not ready.
of free blocks on the device and when free blocks are getting tight it tries
to readjust/recalculate that value by syncing the FS.
Second stage will be resizing the data/metadata partitions.
