the kernel allocated a buffer but did not zero it as it was about
to be completely filled by a uiomove() from the user's buffer.
However, if the uiomove() failed, the old contents of the buffer
could be exposed especially if the file was being mmap'ed. The
fix was to always zero the buffer when it was allocated.
This change first attempts the uiomove() to the newly allocated
(and dirty) buffer and only zeros it if the uiomove() fails. The
effect is to eliminate the gratuitous zeroing of the buffer in
the usual case where the uiomove() successfully fills it.
Reviewed by: kib
Tested by: scottl
MFC after: 2 weeks (to 9 only)
Reading register $29 with RDHWR is becoming the de-facto standard to
implement TLS. According to linux-mips wiki, MIPS Technologies has
reserved hardware register $29 for ABI use. Furthermore current GCC
makes the following assumptions:
- RDHWR is natively available or otherwise emulated by the kernel
- Register $29 holds the TLS pointer
Submitted by: Robert Millan <rmh@debian.org>
LOGIN_SETPRIORITY is set, and setting the priority (rtprio or
setpriority) fails.
PR: kern/164238
Submitted by: Alexander Wittig <alexander@wittig.name>
Reviewed by: des
Approved by: cperciva
MFC after: 1 month
with clang. Also fix a number of warnings uncovered when building with
clang around some implicit enum conversions.
Sponsored by: Intel
Approved by: scottl
A new jail(8) option "devfs_ruleset" defines the ruleset enforcement for
mounting devfs inside jails. A value of -1 disables mounting devfs in
jails, a value of zero means no restrictions. Nested jails can only
have mounting devfs disabled or inherit parent's enforcement as jails are
not allowed to view or manipulate devfs(8) rules.
Utilizes new functions introduced in r231265.
Reviewed by: jamie
MFC after: 1 month
Add support for updating the devfs mount (currently only changing the
ruleset number is supported).
Check mnt_optnew with vfs_filteropt(9).
This new option sets the specified ruleset number as the active ruleset
of the new devfs mount and applies all its rules at mount time. If the
specified ruleset doesn't exist, a new empty ruleset is created.
MFC after: 1 month
1. Fixed timeout specification for the msleep in mps_wait_command().
Added 30 second timeout for mps_wait_command() calls in mps_user.c.
2. Make sure we call mps_detach_user() from the kldunload path.
3. Raid Hotplug behavior change.
The driver now removes a volume when it goes to a failed state,
so we also need to add volume back to the OS when it goes to
opitimal/degraded/online from failed/missing.
Handle raid volume add and remove from the IR_Volume event.
4. Added some more debugging information.
5. Replace xpt_async(AC_LOST_DEVICE, path, NULL) with
mpssas_rescan_target().
This is to work around a panic in CAM that shows up when adding a
drive with a rescan and removing another device from the driver thread
with an AC_LOST_DEVICE async notification.
This problem was encountered in testing with the LSI sas2ircu utility,
which was used to create a RAID volume from physical disks. The driver
has to create the RAID volume target and remove the physical disk
targets, and triggered a panic in the process.
The CAM issue needs to be fully diagnosed and fixed, but this works
around the issue for now.
6. Fix some memory initialization issues in mps_free_command().
7. Resolve the "devq freeze forever" issue. This was caused by the
internal read capacity command issued in the non-head version of the
driver. When the command completed with an error, the driver wasn't
unfreezing thd device queue.
The version in head uses the CAM infrastructure for getting the read
capacity information, and therefore doesn't have the same issue.
8. Bump the version to 13.00.00.00-fbsd. (this is very close to LSI's
internal stable driver 13.00.00.00)
Submitted by: Kashyap Desai <Kashyap.Desai@lsi.com>
MFC after: 3 days
TUNABLE variable (hw.netmap.buf_size) so we can experiment
with values different from 2048 which may give better cache performance.
- rearrange the memory allocation code so it will be easier
to replace it with a different implementation. The current code
relies on a single large contiguous chunk of memory obtained through
contigmalloc.
The new implementation (not committed yet) uses multiple
smaller chunks which are easier to fit in a fragmented address
space.
side effect of something else using them. If they haven't been loaded
already but you want to use them, say for configuring a jail, you're out
of luck.
So add a knob to always load the default rulesets. While I'm here document
the other devfs_ knobs in rc.conf.5.
This should have been included in change 230592.
The supported hardware section still needs some updating to reflect
the current reality.
MFC after: 3 days
ext4 but that can be used in ext3 mode.
Also adjust the internal inode to carry the birthtime,
like in UFS, which is starting to get some use when
big inodes are available.
Right now these are just placeholders for features
to come.
Approved by: jhb (mentor)
MFC after: 2 weeks
- Increase probing order for ECDT table to match HID-based probing.
- Decrease probing order for HPET table to match HID-based probing.
- Decrease probing order for CPUs and system resources.
- Fix ACPI_DEV_BASE_ORDER to reflect the reality.
every 30 seconds. This spike in I/O caused the system to pause every
30 seconds which was quite annoying. So, the way that sync worked
was changed so that when a vnode was first dirtied, it was put on
a 30-second cleaning queue (see the syncer_workitem_pending queues
in kern/vfs_subr.c). If the file has not been written or deleted
after 30 seconds, the syncer pushes it out. As the syncer runs once
per second, dirty files are trickled out slowly over the 30-second
period instead of all at once by a call to sync(2).
The one drawback to this is that it does not cover the filesystem
metadata. To handle the metadata, vfs_allocate_syncvnode() is called
to create a "filesystem syncer vnode" at mount time which cycles
around the cleaning queue being sync'ed every 30 seconds. In the
original design, the only things it would sync for UFS were the
filesystem metadata: inode blocks, cylinder group bitmaps, and the
superblock (e.g., by VOP_FSYNC'ing devvp, the device vnode from
which the filesystem is mounted).
Somewhere in its path to integration with FreeBSD the flushing of
the filesystem syncer vnode got changed to sync every vnode associated
with the filesystem. The result of this change is to return to the
old filesystem-wide flush every 30-seconds behavior and makes the
whole 30-second delay per vnode useless.
This change goes back to the originally intended trickle out sync
behavior. Key to ensuring that all the intended semantics are
preserved (e.g., that all inode updates get flushed within a bounded
period of time) is that all inode modifications get pushed to their
corresponding inode blocks so that the metadata flush by the
filesystem syncer vnode gets them to the disk in a timely way.
Thanks to Konstantin Belousov (kib@) for doing the audit and commit
-r231122 which ensures that all of these updates are being made.
Reviewed by: kib
Tested by: scottl
MFC after: 2 weeks
