Jilles Tjoelker [Sun, 10 Feb 2013 18:56:37 +0000 (18:56 +0000)]
find: Run when cwd cannot be opened, except with -execdir or -delete.
fts(3) can run (albeit more slowly and imposing the {PATH_MAX} limit) when
the current directory cannot be opened. Therefore, do not make a failure to
open the current directory (for returning to it later in -exec) fatal.
If -execdir or -delete are used, the expectation is that fts(3) will use
chdir to avoid race conditions (except for -execdir with -L). Do not break
this expectation any more than it already is by still failing if the current
directory cannot be opened.
Colin Percival [Sun, 10 Feb 2013 17:58:44 +0000 (17:58 +0000)]
Don't try to suppress the inclusion of the build date in named's version
string by undefining __DATE__, since (unlike gcc) clang doesn't allow us
to do that. Instead, define NO_VERSION_DATE, which was helpfully added
to the named source code for exactly this purpose.
Jilles Tjoelker [Sun, 10 Feb 2013 13:28:02 +0000 (13:28 +0000)]
find: In -execdir ... {} +, only pass one file per invocation.
This is inefficient but ensures that -execdir ... {} + does not mix files
from different directories in one invocation; the command could not access
some files. Files from the same directory should really be handled in one
invocation but this is somewhat more complicated.
- Move scratch data from the USB bus structure to the USB device structure
so that simultaneous access cannot happen. Protect scratch area using
the enumeration lock. Also reduce stack usage in usbd_transfer_setup()
by moving some big stack members to the scratch area. This saves around
200 bytes of stack.
- Fix a whitespace.
- Streamline detach logic in wlan drivers, so that
freed memory cannot be used during detach.
- Remove all panic() calls from the urtw driver because
panic() is not appropriate here.
- Remove redundant checks for device detached in
device detach callbacks.
- Use DEVMETHOD_END to mark end of device methods.
Fix several unsafe pointer dereferences in the buffered_write()
function, implementing the sysctl vfs.ffs.set_bufoutput (not used in
the tree yet).
- The current directory vnode dereference is unsafe since fd_cdir
could be changed and unreferenced, lock the filedesc around and vref
the fd_cdir.
- The VTOI() conversion of the fd_cdir is unsafe without first
checking that the vnode is indeed from an FFS mount, otherwise
the code dereferences a random memory.
- The cdir could be reclaimed from under us, lock it around the
checks.
- The type of the fp vnode might be not a disk, or it might have
changed while the thread was in flight, check the type.
Reviewed and tested by: mckusick
MFC after: 2 weeks
Attilio Rao [Sun, 10 Feb 2013 01:04:10 +0000 (01:04 +0000)]
Remove a racy checks on resident and cached pages for
tmpfs_mapped{read, write}() functions:
- tmpfs_mapped{read, write}() are only called within VOP_{READ, WRITE}(),
which check before-hand to work only on valid VREG vnodes. Also the
vnode is locked for the duration of the work, making vnode reclaiming
impossible, during the operation. Hence, vobj can never be NULL.
- Currently check on resident pages and cached pages without vm object
lock held is racy and can do even more harm than good, as a page could
be transitioning between these 2 pools and then be skipped entirely.
Skip the checks as lookups on empty splay trees are very cheap.
Brooks Davis [Sat, 9 Feb 2013 23:17:28 +0000 (23:17 +0000)]
Add nmtree to ITOOLS if it is installed on the host instead of keying off
the BOOTSTRAPPING variable. The previous test was wrong because
BOOTSTRAPPING is 0 in most cases.
Xin LI [Sat, 9 Feb 2013 06:39:28 +0000 (06:39 +0000)]
MFV r245512:
* Illumos zfs issue #3035 [1] LZ4 compression support in ZFS.
LZ4 is a new high-speed BSD-licensed compression algorithm created
by Yann Collet that delivers very high compression and decompression
performance compared to lzjb (>50% faster on compression, >80% faster
on decompression and around 3x faster on compression of incompressible
data), while giving better compression ratio [1].
This version of LZ4 corresponds to upstream's [2] revision 85.
Please note that for obvious reasons this is not backward read
compatible. This means once a pool have LZ4 compressed data, these
data can no longer be read by older ZFS implementations.
Local changes:
- On-stack hash table disabled and using kernel slab allocator
instead, at this time. This requires larger kernel thread stack
for zio workers. This may change in the future should we adjusted
the zio workers' thread stack size.
- likely and unlikely will be undefined if they are already defined,
this is required for i386 XEN build.
- Removed De Bruijn sequence based __builtin_ctz family of builtins
in favor of the latter. Both GCC and clang supports these builtins.
- Changed the way the LZ4 code detects endianness.
- Manual pages modifications to mention the feature based on Illumos
counterpart.
- Boot loader changes to make it support LZ4 decompression.
ext2fs: make e2fs_maxcontig local and remove tautological check.
e2fs_maxcontig was modelled after UFS when bringing the
"Orlov allocator" to ext2. On UFS fs_maxcontig is kept in the
superblock and is used by userland tools (fsck and growfs),
In ext2 this information is volatile so it is not available
for userland tools, so in this case it doesn't have sense
to carry it in the in-memory superblock.
According to the README file [1] the 12u variant, unlike
the 12g variant, contains no copyleft code. It is therefore
convenient to keep using the original versioning scheme to
prevent confusions.
Print a warning if not setuid root.
Document the need for the setuid bit and how to set it.
Explain why it isn't set by default, and suggest simply adding users
to groups instead.
Devin Teske [Fri, 8 Feb 2013 11:14:01 +0000 (11:14 +0000)]
Remove NO_OBJ from Makefiles that generate manuals because this causes the
GZIP compressed manuals to appear in ./src instead of the appropriate obj dir.
Adrian Chadd [Fri, 8 Feb 2013 09:11:55 +0000 (09:11 +0000)]
Fix ieee80211_mesh.c compilation.
* Add the superg.h header to allow ieee80211_check_ff() to work
* Since the assert stuff creates assertions based on line numbers and there
was a conflict, just nudge things down a bit.
Adrian Chadd [Fri, 8 Feb 2013 09:07:03 +0000 (09:07 +0000)]
Fix a corner case that I noticed with the AR5416 (and it's currently
crappy 802.11n performance, sigh.)
With the AR5416, aggregates need to be limited to 8KiB if RTS/CTS is
enabled. However, larger aggregates were going out with RTSCTS enabled.
The following was going on:
* The first buffer in the list would have RTS/CTS enabled in
bf->bf_state.txflags;
* The aggregate would be formed;
* The "copy over the txflags from the first buffer" logic that I added
blanked the RTS/CTS TX flags fields, and then copied the bf_first
RTS/CTS flags over;
* .. but that'd cause bf_first to be blanked out! And thus the flag
was cleared;
* So the rest of the aggregate formation would run with those flags
cleared, and thus > 8KiB aggregates were formed.
The driver is now (again) correctly limiting aggregate formation for
the AR5416 but there are still other pending issues to resolve.
Jilles Tjoelker [Thu, 7 Feb 2013 22:42:33 +0000 (22:42 +0000)]
sh: Simplify mksyntax and make it fit for cross-compiling.
Now it outputs fixed files, which use constants provided by the C standard
library to determine appropriate values for the target machine.
Before, mksyntax inspected the host machine which resulted in subtle
breakage if e.g. char is signed on the host and unsigned on the target such
as when cross-compiling on x86 for ARM.
Tested using -funsigned-char on amd64. Compiling build-tools without it and
sh itself with it causes various tests to fail without this change but not
with this change. With consistent -funsigned-char, tests pass with or
without this change.
The mksyntax program could be removed and syntax.c and syntax.h committed to
the repository.
Mesh HWMP forwarding information: updating FI for transmitter.
* Added hwmp_update_transmitter function that checks if the metric
to the transmitter have improved. If old FI is invalid or metric
is larger the FI to the transmitter is updated occurdingly.
This is a recommendation from the 802.11 2012 standard, table 13-9;
* When calling ieee80211_mesh_rt_flush_peer, the rt->rt_dest argument
should not be passed because it can get freed before invalidating
the other routes that depends on it to compare with next_hop.
Use PERR_DADDR(i) instead;
Mesh HWMP: don't send an intermediate PREP for proxy entries.
* The standard is unclear about what should happen in case a mesh STA (not
marked as a mesh gate) recevies a PREQ for a destination that is marked
as proxy. Solution for now is not to do intermediate reply at all, and
let the PREQ reach the mesh gate;
Mesh HWMP PREQ update: proxy reply only if mesh STA is a meshgate.
* Original PREP frame is transmitted only by the target mesh STA or the
mesh STA that is the proxy target;
* Fixed so that metric value is not over written incorrectly in
hwmp_recv_preq for when replying back with a PREP;
HWMP: ic->raw_xmit didn't always point to correct ni.
This is a code re-write. ic->raw_xmit need a pointer to ieee80211_node
for the destination node (da). I have reorganized the code so that
a pointer to the da node is searched for in the end & in one place.
* Make mesh_find_txnode public to be used by HWMP, renamed to
ieee80211_mesh_finx_txnode;
* changed the argument from ieee80211_node to ieee80211vap for all
hwmp_send_* functions;
* removed the 'sa' argument from hwmp_send_* functions as all HWMP frames
have the source address equal to vap->iv_myaddr;
* Modified hwmp_send_action so that if da is MULTCAST ni=vap->iv_bss
otherwise we called ieee80211_mesh_find_txnode. Also no need to hold
a reference in this functions if da is not MULTICAST as by finding the
node it became referenced in ieee80211_find_txnode;
* Modified mesh_find_txnode to be able to handle proxy marked entries by
recursively calling itself to find the txnode towards the active mesh gate;
* Mesh Gate: Added a new function that transmits data frames
similar to ieee80211_start;
* Modified ieee80211_mesh_forward_to_gates so that:
+ Frames are duplicated and sent to each valid Mesh Gate;
+ Route is marked invalid before return of function, this is
because we dont know yet which Mesh Gate is we will use;
* Send frames that have no path to a known valid Mesh Gate;
* Added the function ieee80211_mesh_forward_to_gates that sends the frame
to the first found Mesh Gate in the forwarding information;
* If we try to discover again while we are discovering queue frame,
the discovery callout will send the frames either to mesh gates
or discards them silently;
* Queue frame also if we try to discover to frequently;
* Add function ieee80211_mesh_mark_gate in ieee80211_mesh.h;
* When received a proactive PREQ or RANN with corresponding mesh gate
flag set, create a new entry in the known mesh gate list;
* Modified mesh_recv_action_meshgate to do following:
+ if mesh STA already knows the mesh gate of the recevied GANN frame
+ if mesh gate is know, check seq number according to 802.11 standard
+ if mesh gate is not know, add it to the list of known mesh gates
+ if forwarding is enabled and ttl >= 1 then propagate the GANN frame;
* Declare a new malloc type M_80211_MESH_GT_RT;
* Declare a struct to store GANN information, ieee80211_mesh_gate_route. And
add it as a TAILQ list to ieee80211_mesh_state;
A Mesh Gate should transmit a Mesh Action frame containing
ieee80211_meshgann_ie as its only information element periodically
every ieee80211_mesh_gateint ms. Unless the mesh gate is also configure
as a ROOT, then these frames should not be send.
This is according to 802.11 2012 standard;
* Introduce new SYSCTL net.wlan.mesh.gateint, with 10s default;
* Add two new functions mesh_gatemode_setup and mesh_gatemode_cb. This
is similar to how HWMP setups up a callout;
* Add two new action handlers mesh_recv_action_meshgate and
mesh_send_action_meshgate;
* Added ieee80211_add_meshgate to ieee80211_mesh.h;
* Modified mesh_send_action to look similar to hwmp_send_action. This is
because we need to send out broadcast management frames.
* Introduced a new flag for mesh state IEEE80211_MESHFLAGS_ROOT. This flag
is now set by HWMP code when a mesh STA is configured as a ROOT. This
is then checked by mesh_gatemode_cb before scheduling a new callout;
* Added to new field to ieee80211_mesh_state:
+ struct callout ms_gatetimer
+ ieee80211_mesh_seq ms_gateseq;
Mesh: management mesh action frames are to be discarded
when not peered.
* Modified ieee80211_recv_action to check if neighbour is peered for
IEEE80211_ACTION_CAT_MESH frames, if not frame is discarded. This is
according to IEEE802.11 2012 standard;
* Removed duplicate checks in each hwmp_recv_* handlers because HWMP
is a subtype of mesh action;
Update in ieee80211_action.c for mesh code handlers.
* Removed meshlm_send_action and hwmp_send_action. Introduced one common
for all Mesh Action frames meshaction_send_action. According to 802.11
standard Link Metric and HWMP are all under Mesh Action category;
* Did similar changes to recv_action part;
* The size of meshaction_*_action is set to 12. This is to make room for
the rest of Mesh Action category subtypes;
* Change all field prefix from pann_ to gann_;
* Added IEEE80211_MESHGANN_BASE_SZ macro to be used in the length field
of a GANN frame according to 802.11 standard;
* Changed gann_seq field type to uint32_t;
* Added a Gate Announcement interval field according to
IEEE802.11 2012 standard;
* Added IEEE80211_MESHRT_FLAGS_GATE as flag bit to ieee80211_mesh_route;
* Added IEEE80211_MESHRT_FLAGS_GATE as flag bit to ieee80211req_mesh_route;
* A bug occurs while in discovery mode which leaves a path marked with
both Discover and Valid flag. This happens when receiving/sending
PREQ and PREP in a particular order. Solution is to assign the Valid bit
instead of oring it;
This problem happens when using ACL policy to filter mesh STA
but two nodes have different policy. Then one of them will try to
peer all the time. This can also help if for any reason one of the
peering mesh STA have problems sending/receiving peer frames.
* Modified struct ieee80211_node to include two new fields:
+ struct callout ni_mlhtimer /* link mesh backoff timer */
+ uint8_t ni_mlhcnt /* link mesh holding counter */
* Added two new sysctl (check sysctl -d for more info):
+ net.wlan.mesh.backofftimeout=5000
+ net.wlan.mesh.maxholding=2;
* When receiving a beacon and we are in IEEE80211_NODE_MESH_IDLE
check if ni_mlhcnt >= ieee80211_mesh_maxholding, if so do not do anything;
* In mesh_peer_timeout_cb when transitioning from IEEE80211_NODE_MESH_HOLDING
to IEEE80211_NODE_MESH_IDLE increment ni_mlhcnt, and eventually start
ieee80211_mesh_backofftimeout;
When vforked child is traced, the debugging events are not generated
until child performs exec(). The behaviour is reasonable when a
debugger is the real parent, because the parent is stopped until
exec(), and sending a debugging event to the debugger would deadlock
both parent and child.
On the other hand, when debugger is not the parent of the vforked
child, not sending debugging signals makes it impossible to debug
across vfork.
Fix the issue by declining generating debug signals only when vfork()
was done and child called ptrace(PT_TRACEME). Set a new process flag
P_PPTRACE from the attach code for PT_TRACEME, if P_PPWAIT flag is
set, which indicates that the process was created with vfork() and
still did not execed. Check P_PPTRACE from issignal(), instead of
refusing the trace outright for the P_PPWAIT case. The scope of
P_PPTRACE is exactly contained in the scope of P_PPWAIT.
Found and tested by: zont
Reviewed by: pluknet
MFC after: 2 weeks
Randall Stewart [Thu, 7 Feb 2013 15:20:54 +0000 (15:20 +0000)]
This fixes a out-of-order problem with several
of the newer drivers. The basic problem was
that the driver was pulling the mbuf off the
drbr ring and then when sending with xmit(), encounting
a full transmit ring. Thus the lower layer
xmit() function would return an error, and the
drivers would then append the data back on to the ring.
For TCP this is a horrible scenario sure to bring
on a fast-retransmit.
The fix is to use drbr_peek() to pull the data pointer
but not remove it from the ring. If it fails then
we either call the new drbr_putback or drbr_advance
method. Advance moves it forward (we do this sometimes
when the xmit() function frees the mbuf). When
we succeed we always call advance. The
putback will always copy the mbuf back to the top
of the ring. Note that the putback *cannot* be used
with a drbr_dequeue() only with drbr_peek(). We most
of the time, in putback, would not need to copy it
back since most likey the mbuf is still the same, but
sometimes xmit() functions will change the mbuf via
a pullup or other call. So the optimial case for
the single consumer is to always copy it back. If
we ever do a multiple_consumer (for lagg?) we
will need a test and atomic in the put back possibly
a seperate putback_mc() in the ring buf.
Stop translating the ERESTART error from the open(2) into EINTR.
Posix requires that open(2) is restartable for SA_RESTART.
For non-posix objects, in particular, devfs nodes, still disable
automatic restart of the opens. The open call to a driver could have
significant side effects for the hardware.
John Baldwin [Wed, 6 Feb 2013 17:06:51 +0000 (17:06 +0000)]
Rework the handling of stop signals in the NFS client. The changes in
195702, 195703, and 195821 prevented a thread from suspending while holding
locks inside of NFS by forcing the thread to fail sleeps with EINTR or
ERESTART but defer the thread suspension to the user boundary. However,
this had the effect that stopping a process during an NFS request could
abort the request and trigger EINTR errors that were visible to userland
processes (previously the thread would have suspended and completed the
request once it was resumed).
This change instead effectively masks stop signals while in the NFS client.
It uses the existing TDF_SBDRY flag to effect this since SIGSTOP cannot
be masked directly. Also, instead of setting PBDRY on individual sleeps,
the NFS client now sets the TDF_SBDRY flag around each NFS request and
stop signals are masked for all sleeps during that region (the previous
change missed sleeps in lockmgr locks). The end result is that stop
signals sent to threads performing an NFS request are completely
ignored until after the NFS request has finished processing and the
thread prepares to return to userland. This restores the behavior of
stop signals being transparent to userland processes while still
preventing threads from suspending while holding NFS locks.
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