jim owens wrote:
Pär Andersson wrote:
I just ran into the max hard link per directory limit, and remembered
this thread. I get EMLINK when trying to create more than 311 (not 272)
links in a directory, so at least the BUG() is fixed.
What is the reason for the limit, and is there any chance of increasing
it to something more reasonable as Mikhail suggested?
For comparison I tried to create 200k hardlinks to the the same file in
the same directory on btrfs, ext4, reiserfs and xfs:
what real-world application uses and needs this many hard links?
The number of links depends on the length of a filename.
Is _13_ (yes, thirteen) hardlinks in a directory a big number? I don't think so.
On systems storing user data, I regularly see user files having maximum length: mostly files
and/or directories saved by users using a webbrowser - the files take their name from the
website title, and these titles can be really long.
Consider that most sides of the world use UTF-8 characters, so the maximum file
name is easily achieved.
Below, we hit this limit with just 13 hardlinks - it's not me to decide if 13 is
"this many hard links".
cd /tmp
dd if=/dev/zero of=btrfs.img bs=1M count=400
mkfs.btrfs btrfs.img
mount -o loop btrfs /mnt/btrfs/
touch
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
i=1 ; while [ $i -ne 40 ] ; do
ln $LNFILE $i$LNFILE
echo $i
i=$((i+1))
done
1
2
3
4
5
6
7
8
9
10
11
12
13
ln: Erzeuge harte Verknüpfung
„14aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa“
⇒
„aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa“:
Datei oder Verzeichnis nicht gefunden
14
ln: Erzeuge harte Verknüpfung
„15aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa“
⇒
„aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa“:
Datei oder Verzeichnis nicht gefunden
15
ln: Erzeuge harte Verknüpfung
„16aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa“
⇒
„aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa“:
Datei oder Verzeichnis nicht gefunden
16
Message from sysl...@dom at Mon Oct 12 22:31:49 2009 ...
dom klogd: [ 9657.948456] Oops: 0000 [#1] SMP
Getötet
17
Message from sysl...@dom at Mon Oct 12 22:31:49 2009 ...
dom klogd: [ 9657.948459] last sysfs file:
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
Message from sysl...@dom at Mon Oct 12 22:31:49 2009 ...
dom klogd: [ 9657.948574] Stack:
Message from sysl...@dom at Mon Oct 12 22:31:49 2009 ...
dom klogd: [ 9657.948589] Call Trace:
--
Tomasz Chmielewski
http://wpkg.org
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