Hello all,
Sharing an update on this issue to help anyone in the future
encountering similar problems.
The first solution I tried was to abandon the installation from source
and install the deb packages. This fixed the issues with the linker and
the compiler and I was able to use the C api, because it put the files
on the default paths for gcc and ld. However, this caused other issues
when I went to mount the filesystem (eg modprobe lustre not working), to
my understanding caused by the deb packages being built for a slightly
different kernel version.
So this made me go back to installing from source and building the deb
packages myself. In order to fix my path errors, I manually copied the
required files to the default paths used by gcc and ld. I understand
this is not necessary, as I can also add the paths when compiling.
However this made me wonder whether there is a way to directly
generate/copy the include files/libraries on the system defaults ?
Looked through the docs but couldn't find anything on this.
In any case, what I needed to copy for my use case (there might be
additional files for completeness which I didn't need, not sure):
cp lustre-release/lustre/include/lustre/*.h /usr/include/lustre/
cp lustre-release/lustre/include/uapi/linux/lustre/*.h
/usr/include/linux/lustre/
cp lustre-release/debian/lustre-dev/usr/lib/* /usr/lib/
After that the simple `gcc test.c -llustreapi` worked
Thanks for the help, feel free to add anything you might think is useful
(potentially a better way to do what I described)
Regards,
Apostolis
On 4/7/24 19:13, Apostolis Stamatis via lustre-discuss wrote:
Thanks for the help Andreas, indeed installing the lustre-dev and
lustre-client-utils packages solved the issue with the lustreapi library.
However I am still getting an error:
```
/usr/bin/ld: /tmp/cceAX1ZW.o: in function `main':
test_file.c:(.text+0x37): undefined reference to `llapi_file_create'
collect2: error: ld returned 1 exit status
```
This leads me to believe I am doing something else wrong (potentially
with the includes?).
Anyone with any input on what the issue might be or alternatively the
steps they have followed to use the C lustre api?
Cheers, Apostolis
On 8/6/24 21:19, Andreas Dilger wrote:
On Jun 8, 2024, at 08:14, Apostolis Stamatis via lustre-discuss
<[email protected]> wrote:
Hello everyone,
I am trying to use the C api for lustre, using Ubuntu 22.04, kernel
version 5.15.0-107 and lustre client modules version 2.15.4
I am building lustre from source with the following steps (removed
some junk like git clone and cd) (mainly from the guide
https://metebalci.com/blog/lustre-2.15.4-on-rhel-8.9-and-ubuntu-22.04/)
It would be great to copy this page to wiki.lustre.org. It is a bit
ironic that this page is mentioning that the wiki is outdated, but
then proceeds to not update the wiki with new content...
```
sudo apt install build-essential libtool pkg-config flex bison
libpython3-dev libmount-dev libaio-dev libssl-dev libnl-genl-3-dev
libkeyutils-dev libyaml-dev libreadline-dev module-assistant
debhelper dpatch libsnmp-dev mpi-default-dev quilt swig
sh autogen.sh
./configure --disable-server
make dkms-debs
sudo dpkg -i debs/lustre-client-modules-dkms_2.15.4-1_amd64.deb
sudo apt --fix-broken install
sudo dpkg -i debs/lustre-client-utils_2.15.4-1_amd64.deb
```
The client works as expected and can mount and modify the filesystem.
However when I try to compile the sample program using gcc v 11.4.0
with the command
`gcc -I/usr/src/lustre-client-modules-2.15.4/lustre/include
-I/usr/src/lustre-client-modules-2.15.4/lustre/include/uapi/
-I/usr/src/lustre-client-modules-2.15.4/lustre/include/lustre
-llustreapi test_file.c -o test`
I get the error `/usr/bin/ld: cannot find -llustreapi: No such file
or directory`
After trying to find the lustreapi library manually, indeed I can't
seem to find it anywhere
According to the most recent build on the b2_15 branch on Ununtu
22.04
https://build.whamcloud.com/job/lustre-b2_15/87/arch=x86_64,build_type=client,distro=ubuntu2204,ib_stack=inkernel/
There is a "lustre-dev" package built, and it looks like that this
would contain the library files, "This package provides development
libraries for the Lustre filesystem."
Cheers, Andreas
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