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Kai Meyer | Sr. Software Engineer
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On 12/02/2011 11:23 PM, OGAWA Hirofumi wrote:
> OGAWA Hirofumi writes:
>
>> Kai Meyer writes:
>>
>>> Thanks for the helpful response. I'm not entirely sure I understand the
>>> next part though. I hacked a dirty entry dumper tool:
>>>
&
On 12/08/2011 07:47 AM, Srivatsa Bhat wrote:
2 things:
1. Documentation/lockdep-design.txt explains the "cryptic lock state
symbols".
2. Please post the lockdep splat _exactly_ as it appears, and _in full_
(and without line-wrapping, if possible). Usually lockdep is
intelligent
enough
I'm getting this when I try to spin_unlock a recently acquired lock with
spin_lock. IRQs are still somewhat of a mystery to me, and cryptic lock
state symbols (IN-HARDIRQ-W, HARDIRQ-ON-W) are unintelligible to me.
Dec 7 15:52:20 dev2 kernel: =
Dec 7 15:52:20 dev
On 12/01/2011 12:20 PM, OGAWA Hirofumi wrote:
> Kai Meyer writes:
>
>>> The i_pos means directory entry (contains inode information in unix-fs)
>>> position,
>>>
>>> block number == i_pos / (logical-blocksize / 32)
>>> offset
Correction. The problem occurs when 8 bios of size 512 with 1 bvec each
all share the same page. I made a bad assumption previously.
-Kai Meyer
On 12/01/2011 10:49 AM, Kai Meyer wrote:
> I want to be able to copy data into a struct bio *, so I use
> bio_for_each_segment to loop throug
umentation or high level explanation of kmap/kunmap or other
ideas to try are welcome.
-Kai Meyer
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On 12/01/2011 07:38 AM, OGAWA Hirofumi wrote:
> Kai Meyer writes:
>
>> I'm getting this error:
>> FAT: Filesystem error (dev sblsnap0)
>> fat_get_cluster: invalid cluster chain (i_pos 523791)
>>
>> I'm wondering if there was a way to figure ou
. Is there a straight forward way to convert
i_pos to a sector value? I've been staring at the fat.c and fat.h code
all morning, and I'm having trouble grok'ing the flow.
-Kai Meyer
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ker *worker" inside worker_fn?
Or does the work_queue stuff need to continue to use the "struct
work_struct work" member after the end of worker_fn?
-Kai Meyer
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On 11/15/2011 11:13 AM, mic...@michaelblizek.twilightparadox.com wrote:
> Hi!
>
> On 12:15 Mon 14 Nov , Kai Meyer wrote:
> ...
>
>> My
>> caller function has an atomic_t value that I set equal to the number of
>> bios I want to submit. Then I pass a pointer t
me like I'm re-inventing a wheel here. Are there
mechanisms that are better suited for waiting for tasks to complete? Or
even for generic block I/O functions?
-Kai Meyer
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On 11/10/2011 11:58 PM, Rajat Sharma wrote:
> For most of the block drivers bio_endio runs in a context of its
> tasklet, so it is indeed atomic context.
>
> -Rajat
>
> On Fri, Nov 11, 2011 at 4:50 AM, Kai Meyer wrote:
>>
>> On 11/10/2011 04:00 PM, Jeff Haran wro
On 11/10/2011 04:00 PM, Jeff Haran wrote:
>> -Original Message-
>> From: kernelnewbies-boun...@kernelnewbies.org [mailto:kernelnewbies-
>> boun...@kernelnewbies.org] On Behalf Of Kai Meyer
>> Sent: Thursday, November 10, 2011 1:55 PM
>> To: kernelnewbies@ke
t choice?
In addition, I'd like to be more confident in my assumptions above. Can
I test for atomic context? For instance, I know that you can call
irqs_disabled(), is there a similar is_atomic() function I can call? I
would like to put a few calls in different places to learn what sort of
more about the context in which my endio
function is being called.
On 11/10/2011 11:02 AM, Kai Meyer wrote:
> Well, I changed my code to use a mutex instead of a spinlock, and now I get:
> BUG: scheduling while atomic: swapper/0/0x1001
> All I changed was the spinlock_t to a struct mu
x27;m confused. What does mutex_lock do besides set
values in an atomic_t?
-Kai Meyer
On 11/10/2011 10:02 AM, Kai Meyer wrote:
>
> On 11/09/2011 08:38 PM, Dave Hylands wrote:
>> Hi Kai,
>>
>> On Wed, Nov 9, 2011 at 3:12 PM, Kai Meyer wrote:
>>> Ok, I need mutual exclu
On 11/09/2011 08:38 PM, Dave Hylands wrote:
> Hi Kai,
>
> On Wed, Nov 9, 2011 at 3:12 PM, Kai Meyer wrote:
>> Ok, I need mutual exclusion on a data structure regardless of interrupts
>> and core. It sounds like it can be done by using a spinlock and
>> disabling inter
I use a bitmap to
indicate that alloc_data has completed. I also need to protect
alloc_data from being run multiple times, so I use the spin_lock to
ensure that test_bit (and possibly retrieve_data) is not run while
alloc_data is being run (because it runs while the bit is cleared).
-Kai Meyer
When I readup on spinlocks, it seems like I need to choose between
disabling interrupts and not. If a spinlock_t is never used during an
interrupt, am I safe to leave interrupts enabled while I hold the lock?
(Same question for read/write locks if it is different.)
-Kai Meyer
ite'
functions. If they don't exist, I would probably end up writing
functions like:
int blk_read(struct block_device *bdev, void *buffer, off_t length);
int blk_write(struct block_device *bdev, void *buffer, off_t length);
Pros and co
I do call unregister_chrdev_region. There are 5 functions in my original
email that I call during the life of my module. Still no luck.
-Kai Meyer
On 10/19/2011 09:47 PM, rohan puri wrote:
On Thu, Oct 20, 2011 at 2:25 AM, Kai Meyer <mailto:k...@gnukai.com>> wrote:
Unfort
Thanks for catching that :) I knew it would be something simple.
On 10/19/2011 10:00 PM, rohan puri wrote:
On Thu, Oct 20, 2011 at 3:04 AM, Kai Meyer <mailto:k...@gnukai.com>> wrote:
I'm trying to poke around an ext4 file system. I can submit a bio for
the correct bloc
I'm trying to poke around an ext4 file system. I can submit a bio for
the correct block, and read in what seems to be the correct information,
but when I try to memcpy my char *buffer to a reference to a struct I've
made, it just doesn't seem to work. The relevant code looks like this:
typedef
r now).
-Kai Meyer
On 10/19/2011 02:18 PM, Daniel Baluta wrote:
> On Wed, Oct 19, 2011 at 7:04 PM, Kai Meyer wrote:
>> I can't seem to get my character device to remove itself from the
>> /proc/devices list. I'm calling all of the following functions like so:
>&g
just like I do.
To be clear, after I unload my module (after calling cdev_del and
unregister_chrdev_region), my "my_char" string still shows up in
/proc/devices.
-Kai Meyer
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On 09/09/2011 12:39 PM, Vaibhav Jain wrote:
On Fri, Sep 9, 2011 at 11:12 AM, Kai Meyer <mailto:k...@gnukai.com>> wrote:
On 09/09/2011 09:05 AM, Vaibhav Jain wrote:
Hi,
I am not able to understand how diff between two trees of which
one is just contains har
t way the
diff will work.
Otherwise, skip the hard link part all together, and just make a full
copy. Uses lots of disk space and takes longer to diff.
-Kai Meyer
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Ext4_Disk_Layout and then read
the bitmaps directly from disk", I think I can deal with that too.
-Kai Meyer
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, but I don't know of any.
My suggestion would be to hardlink the entire source tree, and then
afterwards delete the destination hard links for the files you want to
modify, and re-copy (normal copy) the original files again.
-Kai Meyer
On 09/07/2011 04:16 PM, Vaibhav Jain wrote:
Hi,
I am trying
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