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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Stack footprint from hell had been due to many struct nameidata in there.
No more.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Analog of lookup_path(), takes struct path *.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Commit f06febc96ba8e0af80bcc3eaec0a109e88275fac ("timers: fix itimer/
many thread hang") introduced a new task_cputime interface and
subsequently only converted binfmt_elf over to it. This results in the
build for binfmt_elf_fdpic blowing up given that p->signal->{u,s}time
have disappeared from underneath us.
Apply the same trivial fix from binfmt_elf to binfmt_elf_fdpic.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
This merges branches irq/genirq, irq/sparseirq-v4, timers/hpet-percpu
and x86/uv.
The sparseirq branch is just preliminary groundwork: no sparse IRQs are
actually implemented by this tree anymore - just the new APIs are added
while keeping the old way intact as well (the new APIs map 1:1 to
irq_desc[]). The 'real' sparse IRQ support will then be a relatively
small patch ontop of this - with a v2.6.29 merge target.
* 'genirq-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (178 commits)
genirq: improve include files
intr_remapping: fix typo
io_apic: make irq_mis_count available on 64-bit too
genirq: fix name space collisions of nr_irqs in arch/*
genirq: fix name space collision of nr_irqs in autoprobe.c
genirq: use iterators for irq_desc loops
proc: fixup irq iterator
genirq: add reverse iterator for irq_desc
x86: move ack_bad_irq() to irq.c
x86: unify show_interrupts() and proc helpers
x86: cleanup show_interrupts
genirq: cleanup the sparseirq modifications
genirq: remove artifacts from sparseirq removal
genirq: revert dynarray
genirq: remove irq_to_desc_alloc
genirq: remove sparse irq code
genirq: use inline function for irq_to_desc
genirq: consolidate nr_irqs and for_each_irq_desc()
x86: remove sparse irq from Kconfig
genirq: define nr_irqs for architectures with GENERIC_HARDIRQS=n
...
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There is no need for irq_desc here. Even for sparse_irq we can
handle this clever in for_each_irq_nr().
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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This code is not ready, but we need to rip it out instead of rebasing
as we would lose the APIC/IO_APIC unification otherwise.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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also print out irq no in /proc/interrups and /proc/stat in hex, so could
tell bus/dev/func.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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loop with irq_desc list
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Replace another nr_irqs loop to avoid the allocation of all sparse
irq entries - use for_each_irq_desc instead.
v2: make sure arch without GENERIC_HARDIRQS works too
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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based on Eric's patch ...
together mold it with dyn_array for irq_desc, will allcate kstat_irqs for
nr_irq_desc alltogether if needed. -- at that point nr_cpus is known already.
v2: make sure system without generic_hardirqs works they don't have irq_desc
v3: fix merging
v4: [mingo@elte.hu] fix typo
[ mingo@elte.hu ] irq: build fix
fix:
arch/x86/xen/spinlock.c: In function 'xen_spin_lock_slow':
arch/x86/xen/spinlock.c:90: error: 'struct kernel_stat' has no member named 'irqs'
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'v28-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (36 commits)
fix documentation of sysrq-q really
Fix documentation of sysrq-q
timer_list: add base address to clock base
timer_list: print cpu number of clockevents device
timer_list: print real timer address
NOHZ: restart tick device from irq_enter()
NOHZ: split tick_nohz_restart_sched_tick()
NOHZ: unify the nohz function calls in irq_enter()
timers: fix itimer/many thread hang, fix
timers: fix itimer/many thread hang, v3
ntp: improve adjtimex frequency rounding
timekeeping: fix rounding problem during clock update
ntp: let update_persistent_clock() sleep
hrtimer: reorder struct hrtimer to save 8 bytes on 64bit builds
posix-timers: lock_timer: make it readable
posix-timers: lock_timer: kill the bogus ->it_id check
posix-timers: kill ->it_sigev_signo and ->it_sigev_value
posix-timers: sys_timer_create: cleanup the error handling
posix-timers: move the initialization of timer->sigq from send to create path
posix-timers: sys_timer_create: simplify and s/tasklist/rcu/
...
Fix trivial conflicts due to sysrq-q description clahes in
Documentation/sysrq.txt and drivers/char/sysrq.c
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'timers/ntp', 'timers/posixtimers' and 'timers/debug' into v28-timers-for-linus
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Overview
This patch reworks the handling of POSIX CPU timers, including the
ITIMER_PROF, ITIMER_VIRT timers and rlimit handling. It was put together
with the help of Roland McGrath, the owner and original writer of this code.
The problem we ran into, and the reason for this rework, has to do with using
a profiling timer in a process with a large number of threads. It appears
that the performance of the old implementation of run_posix_cpu_timers() was
at least O(n*3) (where "n" is the number of threads in a process) or worse.
Everything is fine with an increasing number of threads until the time taken
for that routine to run becomes the same as or greater than the tick time, at
which point things degrade rather quickly.
This patch fixes bug 9906, "Weird hang with NPTL and SIGPROF."
Code Changes
This rework corrects the implementation of run_posix_cpu_timers() to make it
run in constant time for a particular machine. (Performance may vary between
one machine and another depending upon whether the kernel is built as single-
or multiprocessor and, in the latter case, depending upon the number of
running processors.) To do this, at each tick we now update fields in
signal_struct as well as task_struct. The run_posix_cpu_timers() function
uses those fields to make its decisions.
We define a new structure, "task_cputime," to contain user, system and
scheduler times and use these in appropriate places:
struct task_cputime {
cputime_t utime;
cputime_t stime;
unsigned long long sum_exec_runtime;
};
This is included in the structure "thread_group_cputime," which is a new
substructure of signal_struct and which varies for uniprocessor versus
multiprocessor kernels. For uniprocessor kernels, it uses "task_cputime" as
a simple substructure, while for multiprocessor kernels it is a pointer:
struct thread_group_cputime {
struct task_cputime totals;
};
struct thread_group_cputime {
struct task_cputime *totals;
};
We also add a new task_cputime substructure directly to signal_struct, to
cache the earliest expiration of process-wide timers, and task_cputime also
replaces the it_*_expires fields of task_struct (used for earliest expiration
of thread timers). The "thread_group_cputime" structure contains process-wide
timers that are updated via account_user_time() and friends. In the non-SMP
case the structure is a simple aggregator; unfortunately in the SMP case that
simplicity was not achievable due to cache-line contention between CPUs (in
one measured case performance was actually _worse_ on a 16-cpu system than
the same test on a 4-cpu system, due to this contention). For SMP, the
thread_group_cputime counters are maintained as a per-cpu structure allocated
using alloc_percpu(). The timer functions update only the timer field in
the structure corresponding to the running CPU, obtained using per_cpu_ptr().
We define a set of inline functions in sched.h that we use to maintain the
thread_group_cputime structure and hide the differences between UP and SMP
implementations from the rest of the kernel. The thread_group_cputime_init()
function initializes the thread_group_cputime structure for the given task.
The thread_group_cputime_alloc() is a no-op for UP; for SMP it calls the
out-of-line function thread_group_cputime_alloc_smp() to allocate and fill
in the per-cpu structures and fields. The thread_group_cputime_free()
function, also a no-op for UP, in SMP frees the per-cpu structures. The
thread_group_cputime_clone_thread() function (also a UP no-op) for SMP calls
thread_group_cputime_alloc() if the per-cpu structures haven't yet been
allocated. The thread_group_cputime() function fills the task_cputime
structure it is passed with the contents of the thread_group_cputime fields;
in UP it's that simple but in SMP it must also safely check that tsk->signal
is non-NULL (if it is it just uses the appropriate fields of task_struct) and,
if so, sums the per-cpu values for each online CPU. Finally, the three
functions account_group_user_time(), account_group_system_time() and
account_group_exec_runtime() are used by timer functions to update the
respective fields of the thread_group_cputime structure.
Non-SMP operation is trivial and will not be mentioned further.
The per-cpu structure is always allocated when a task creates its first new
thread, via a call to thread_group_cputime_clone_thread() from copy_signal().
It is freed at process exit via a call to thread_group_cputime_free() from
cleanup_signal().
All functions that formerly summed utime/stime/sum_sched_runtime values from
from all threads in the thread group now use thread_group_cputime() to
snapshot the values in the thread_group_cputime structure or the values in
the task structure itself if the per-cpu structure hasn't been allocated.
Finally, the code in kernel/posix-cpu-timers.c has changed quite a bit.
The run_posix_cpu_timers() function has been split into a fast path and a
slow path; the former safely checks whether there are any expired thread
timers and, if not, just returns, while the slow path does the heavy lifting.
With the dedicated thread group fields, timers are no longer "rebalanced" and
the process_timer_rebalance() function and related code has gone away. All
summing loops are gone and all code that used them now uses the
thread_group_cputime() inline. When process-wide timers are set, the new
task_cputime structure in signal_struct is used to cache the earliest
expiration; this is checked in the fast path.
Performance
The fix appears not to add significant overhead to existing operations. It
generally performs the same as the current code except in two cases, one in
which it performs slightly worse (Case 5 below) and one in which it performs
very significantly better (Case 2 below). Overall it's a wash except in those
two cases.
I've since done somewhat more involved testing on a dual-core Opteron system.
Case 1: With no itimer running, for a test with 100,000 threads, the fixed
kernel took 1428.5 seconds, 513 seconds more than the unfixed system,
all of which was spent in the system. There were twice as many
voluntary context switches with the fix as without it.
Case 2: With an itimer running at .01 second ticks and 4000 threads (the most
an unmodified kernel can handle), the fixed kernel ran the test in
eight percent of the time (5.8 seconds as opposed to 70 seconds) and
had better tick accuracy (.012 seconds per tick as opposed to .023
seconds per tick).
Case 3: A 4000-thread test with an initial timer tick of .01 second and an
interval of 10,000 seconds (i.e. a timer that ticks only once) had
very nearly the same performance in both cases: 6.3 seconds elapsed
for the fixed kernel versus 5.5 seconds for the unfixed kernel.
With fewer threads (eight in these tests), the Case 1 test ran in essentially
the same time on both the modified and unmodified kernels (5.2 seconds versus
5.8 seconds). The Case 2 test ran in about the same time as well, 5.9 seconds
versus 5.4 seconds but again with much better tick accuracy, .013 seconds per
tick versus .025 seconds per tick for the unmodified kernel.
Since the fix affected the rlimit code, I also tested soft and hard CPU limits.
Case 4: With a hard CPU limit of 20 seconds and eight threads (and an itimer
running), the modified kernel was very slightly favored in that while
it killed the process in 19.997 seconds of CPU time (5.002 seconds of
wall time), only .003 seconds of that was system time, the rest was
user time. The unmodified kernel killed the process in 20.001 seconds
of CPU (5.014 seconds of wall time) of which .016 seconds was system
time. Really, though, the results were too close to call. The results
were essentially the same with no itimer running.
Case 5: With a soft limit of 20 seconds and a hard limit of 2000 seconds
(where the hard limit would never be reached) and an itimer running,
the modified kernel exhibited worse tick accuracy than the unmodified
kernel: .050 seconds/tick versus .028 seconds/tick. Otherwise,
performance was almost indistinguishable. With no itimer running this
test exhibited virtually identical behavior and times in both cases.
In times past I did some limited performance testing. those results are below.
On a four-cpu Opteron system without this fix, a sixteen-thread test executed
in 3569.991 seconds, of which user was 3568.435s and system was 1.556s. On
the same system with the fix, user and elapsed time were about the same, but
system time dropped to 0.007 seconds. Performance with eight, four and one
thread were comparable. Interestingly, the timer ticks with the fix seemed
more accurate: The sixteen-thread test with the fix received 149543 ticks
for 0.024 seconds per tick, while the same test without the fix received 58720
for 0.061 seconds per tick. Both cases were configured for an interval of
0.01 seconds. Again, the other tests were comparable. Each thread in this
test computed the primes up to 25,000,000.
I also did a test with a large number of threads, 100,000 threads, which is
impossible without the fix. In this case each thread computed the primes only
up to 10,000 (to make the runtime manageable). System time dominated, at
1546.968 seconds out of a total 2176.906 seconds (giving a user time of
629.938s). It received 147651 ticks for 0.015 seconds per tick, still quite
accurate. There is obviously no comparable test without the fix.
Signed-off-by: Frank Mayhar <fmayhar@google.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
fuse: implement nonseekable open
fuse: add include protectors
fuse: config description improvement
fuse: add missing fuse_request_free
fuse: fix SEEK_END incorrectness
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Let the client request nonseekable open using FOPEN_NONSEEKABLE and
call nonseekable_open() on the file if requested.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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Add include protectors to include/linux/fuse.h and fs/fuse/fuse_i.h.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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Make the short description of the FUSE_FS config option clearer.
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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The error handling code for the second call to fuse_request_alloc should
include freeing the result of the first one.
This bug was found by the Coccinelle project:
http://www.emn.fr/x-info/coccinelle/
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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Update file size before using it in lseek(..., SEEK_END).
Reported-by: Amnon Shiloh <u3557@miso.sublimeip.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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Use fs/*/Kconfig more, which is good because everything related to one
filesystem is in one place and fs/Kconfig is quite fat.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs
* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs: (26 commits)
9p: add more conservative locking
9p: fix oops in protocol stat parsing error path.
9p: fix device file handling
9p: Improve debug support
9p: eliminate depricated conv functions
9p: rework client code to use new protocol support functions
9p: remove unnecessary tag field from p9_req_t structure
9p: remove 9p fcall debug prints
9p: add new protocol support code
9p: encapsulate version function
9p: move dirread to fs layer
9p: adjust 9p vfs write operation
9p: move readn meta-function from client to fs layer
9p: consolidate read/write functions
9p: drop broken unused error path from p9_conn_create()
9p: make rpc code common and rework flush code
9p: use the rcall structure passed in the request in trans_fd read_work
9p: apply common request code to trans_fd
9p: apply common tagpool handling to trans_fd
9p: move request management to client code
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In v9fs_get_inode(), for block, as well as char devices (in theory),
the function init_special_inode() is called to set up callback functions
for file ops. this function uses the file mode's value to determine whether
to use block or char dev functions. In v9fs_inode_from_fid(), the function
p9mode2unixmode() is used, but for all devices it initially returns S_IFBLK,
then uses v9fs_get_inode() to initialise a new inode, then finally uses
v9fs_stat2inode(), which would determine whether the inode is a block or
character device. However, at that point init_special_inode() had already
decided to use the block device functions, so even if the inode's mode is
turned to a character device, the block functions are still used to operate
on them. The attached patch simply calls init_special_inode() again for devices
after parsing device node data in v9fs_stat2inode() so that the proper functions
are used.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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Remove depricated conv functions which have been replaced with new
protocol routines.
This patch also reworks the one instance of the file-system code which
directly calls conversion routines (to accomplish unpacking dirreads).
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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Now that the new protocol functions are in place, this patch switches
the client code to using the new support code.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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Currently reading a directory is implemented in the client code.
This function is not actually a wire operation, but a meta operation
which calls read operations and processes the results.
This patch moves this functionality to the fs layer and calls component
wire operations instead of constructing their packets. This provides a
cleaner separation and will help when we reorganize the client functions
and protocol processing methods.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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Currently, the 9p net wire operation ensures that all data is sent by sending
multiple packets if the data requested is larger than the msize. This is
better handled in the vfs code so that we can simplify wire operations to
being concerned with only putting data onto and taking data off of the wire.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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There are a couple of methods in the client code which aren't actually
wire operations. To keep things organized cleaner, these operations are
being moved to the fs layer.
This patch moves the readn meta-function (which executes multiple wire
reads until a buffer is full) to the fs layer.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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Currently there are two separate versions of read and write. One for
dealing with user buffers and the other for dealing with kernel buffers.
There is a tremendous amount of code duplication in the otherwise
identical versions of these functions. This patch adds an additional
user buffer parameter to read and write and conditionalizes handling of
the buffer on whether the kernel buffer or the user buffer is populated.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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Right now there is a transport module structure which provides per-transport
type functions and data and a transport structure which contains per-instance
public data as well as function pointers to instance specific functions.
This patch moves public transport visible instance data to the client
structure (which in some cases had duplicate data) and consolidates the
functions into the transport module structure.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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* git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
NFS: use correct fs type for v4 submounts and referrals
Make nfs_file_cred more robust.
NFS: Enable NFSv4 callback server to listen on AF_INET6 sockets
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Signed-off-by: Andy Adamson<andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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As not all files have an associated open_context (e.g. device special
files), it is safest to test for the existence of the open context
before de-referencing it.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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Allow the NFS callback server to listen for requests via an AF_INET6 or
AF_INET socket when IPv6 support is present in the kernel.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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* 'linux-next' of git://git.infradead.org/ubifs-2.6: (25 commits)
UBIFS: fix ubifs_compress commentary
UBIFS: amend printk
UBIFS: do not read unnecessary bytes when unpacking bits
UBIFS: check buffer length when scanning for LPT nodes
UBIFS: correct condition to eliminate unecessary assignment
UBIFS: add more debugging messages for LPT
UBIFS: fix bulk-read handling uptodate pages
UBIFS: improve garbage collection
UBIFS: allow for sync_fs when read-only
UBIFS: commit on sync_fs
UBIFS: correct comment for commit_on_unmount
UBIFS: update dbg_dump_inode
UBIFS: fix commentary
UBIFS: fix races in bit-fields
UBIFS: ensure data read beyond i_size is zeroed out correctly
UBIFS: correct key comparison
UBIFS: use bit-fields when possible
UBIFS: check data CRC when in error state
UBIFS: improve znode splitting rules
UBIFS: add no_chk_data_crc mount option
...
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Update the comment for ubifs_compress(), which incorrectly states that it
returnsa success/failure indicator.
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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It is better to print "Reserved for root" than
"Reserved pool size", because it is more obvious for users
what this means.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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Fixes the following Oops:
BUG: unable to handle kernel paging request at f8d24000
IP: [<f8ff0657>] :ubifs:ubifs_unpack_bits+0xcd/0x231
*pde = 34333067 *pte = 00000000
Oops: 0000 [#1] PREEMPT SMP
Modules linked in: deflate zlib_deflate lzo lzo_decompress lzo_compress
ubifs ubi nandsim nand nand_ids nand_ecc mtd nfsd lockd sunrpc exportfs
[last unloaded: nand_ecc]
Pid: 7450, comm: sync Not tainted (2.6.27-rc8-ubifs-2.6 #27)
EIP: 0060:[<f8ff0657>] EFLAGS: 00010206 CPU: 0
EIP is at ubifs_unpack_bits+0xcd/0x231 [ubifs]
EAX: 00000000 EBX: 00000000 ECX: d7e43dc0 EDX: 0000ff00
ESI: 00000004 EDI: f8d23ffe EBP: d7e43db4 ESP: d7e43d8c
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process sync (pid: 7450, ti=d7e42000 task=eb6f9530 task.ti=d7e42000)
Stack: 00000400 c0103db4 dc5e8090 d7e43dc0 d7e43dc0 d7e43dc4 0000001c 00000004
f496d1e0 f8d23ffc d7e43dd4 f8ffac7e f8d23ffe 00000000 f8d23ffe f2b7af68
f496d1e0 f8d23ffc d7e43e2c f8ffadc5 00000000 0001f000 00000000 c03b10a7
Call Trace:
[<c0103db4>] ? restore_nocheck_notrace+0x0/0xe
[<f8ffac7e>] ? is_a_node+0x43/0x92 [ubifs]
[<f8ffadc5>] ? dbg_check_ltab+0xf8/0x5c9 [ubifs]
[<c03b10a7>] ? mutex_lock_nested+0x1b2/0x2a0
[<f8ffc86e>] ? ubifs_lpt_start_commit+0x49/0xecb [ubifs]
[<c03b0ef3>] ? mutex_unlock+0xd/0xf
[<f8fef017>] ? ubifs_tnc_start_commit+0x1cf/0xef8 [ubifs]
[<f8fe65d8>] ? do_commit+0x18f/0x52d [ubifs]
[<f8fe69f6>] ? ubifs_run_commit+0x80/0xca [ubifs]
[<f8fd8d35>] ? ubifs_sync_fs+0xdb/0xf6 [ubifs]
[<c0181a07>] ? sync_filesystems+0xc6/0x10c
[<c019f279>] ? do_sync+0x3b/0x6a
[<c019f2ba>] ? sys_sync+0x12/0x18
[<c0103ced>] ? sysenter_do_call+0x12/0x35
=======================
Code: 4d ec 89 01 8b 45 e8 89 10 89 d8 89 f1 d3 e8 85 c0 74 07 29 d6 83 fe
20 75 2a 89 d8 83 c4 1c 5b 5e 5f 5d c3 0f b6 57 01 c1 e2 08 <0f> b6 47 02
c1 e0 10 09 c2 0f b6 07 09 c2 0f b
EIP: [<f8ff0657>] ubifs_unpack_bits+0xcd/0x231 [ubifs] SS:ESP 0068:d7e43d8c
---[ end trace 1bbb4c407a6dd816 ]---
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
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'is_a_node()' function was reading from a buffer before
checking the buffer length, resulting in an OOPS as
follows:
BUG: unable to handle kernel paging request at f8f74002
IP: [<f8f9783f>] :ubifs:ubifs_unpack_bits+0xca/0x233
*pde = 19e95067 *pte = 00000000
Oops: 0000 [#1] PREEMPT SMP
Modules linked in: ubifs ubi mtdchar bio2mtd mtd brd video output
[last unloaded: mtd]
Pid: 6414, comm: integck Not tainted (2.6.27-rc6ubifs34 #23)
EIP: 0060:[<f8f9783f>] EFLAGS: 00010246 CPU: 0
EIP is at ubifs_unpack_bits+0xca/0x233 [ubifs]
EAX: 00000000 EBX: f6090630 ECX: d9badcfc EDX: 00000000
ESI: 00000004 EDI: f8f74002 EBP: d9badcec ESP: d9badcc0
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process integck (pid: 6414, ti=d9bac000 task=f727dae0 task.ti=d9bac000)
Stack: 00000006 f7306240 00000002 00000000 d9badcfc d9badd00 0000001c 00000000
f6090630 f6090630 f8f74000 d9badd10 f8fa1cc9 00000000 f8f74002 00000000
f8f74002 f60fe128 f6090630 f8f74000 d9badd68 f8fa1e46 00000000 0001e000
Call Trace:
[<f8fa1cc9>] ? is_a_node+0x30/0x90 [ubifs]
[<f8fa1e46>] ? dbg_check_ltab+0x11d/0x5bd [ubifs]
[<f8fa388f>] ? ubifs_lpt_start_commit+0x42/0xed3 [ubifs]
[<c038e76a>] ? mutex_unlock+0x8/0xa
[<f8f9625d>] ? ubifs_tnc_start_commit+0x1c8/0xedb [ubifs]
[<f8f8d90b>] ? do_commit+0x187/0x523 [ubifs]
[<c038e76a>] ? mutex_unlock+0x8/0xa
[<f8f7ca17>] ? bud_wbuf_callback+0x22/0x28 [ubifs]
[<f8f8dd1d>] ? ubifs_run_commit+0x76/0xc0 [ubifs]
[<f8f8032c>] ? ubifs_sync_fs+0xd2/0xe6 [ubifs]
[<c01a2e97>] ? vfs_quota_sync+0x0/0x17e
[<c01a5ba6>] ? quota_sync_sb+0x26/0xbb
[<c01a2e97>] ? vfs_quota_sync+0x0/0x17e
[<c01a5c5d>] ? sync_dquots+0x22/0x12c
[<c0173d1b>] ? __fsync_super+0x19/0x68
[<c0173d75>] ? fsync_super+0xb/0x19
[<c0174065>] ? generic_shutdown_super+0x22/0xe7
[<c01a31fc>] ? vfs_quota_off+0x0/0x5fd
[<f8f7cf4d>] ? ubifs_kill_sb+0x31/0x35 [ubifs]
[<c01741f9>] ? deactivate_super+0x5e/0x71
[<c0187610>] ? mntput_no_expire+0x82/0xe4
[<c0187905>] ? sys_umount+0x4c/0x2f6
[<c0187bc8>] ? sys_oldumount+0x19/0x1b
[<c0103b71>] ? sysenter_do_call+0x12/0x25
=======================
Code: c1 f8 03 8d 04 07 8b 4d e8 89 01 8b 45 e4 89 10 89 d8 89 f1 d3 e8 85 c0
74 07 29 d6 83 fe 20 75 2a 89 d8 83 c4 20 5b 5e 5f 5d
EIP: [<f8f9783f>] ubifs_unpack_bits+0xca/0x233 [ubifs] SS:ESP 0068:d9badcc0
---[ end trace 1f02572436518c13 ]---
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
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Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
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Also add debugging checks for LPT size and separate
out c->check_lpt_free from unrelated bitfields.
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
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Bulk-read skips uptodate pages but this was putting its
array index out and causing it to treat subsequent pages
as holes.
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
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Make garbage collection try to keep data nodes from the same
inode together and in ascending order. This improves
performance when reading those nodes especially when bulk-read
is used.
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
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sync_fs can be called even if the file system is mounted
read-only. Ensure the commit is not run in that case.
Reported-by: Zoltan Sogor <weth@inf.u-szeged.hu>
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
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Commit the journal when the FS is sync'ed. This will make
statfs provide better free space report. And we anyway
advice our users to sync the FS if they want better statfs
report.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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'dbg_dump_inode()' is quite outdated and does not print all
the fileds.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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Znode may refer both data nodes and indexing nodes
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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