btrfs-progs 4.6 won't build on CentOS6

btrfs-progs 4.6 won't build on CentOS6

[Steven Haigh]

I've tried to build the new tools for CentOS 6 / Scientific Linux 6 / 
RHEL 6 etc.

During the build process, I see:
cmds-fi-du.c: In function 'du_calc_file_space':
cmds-fi-du.c:330: error: 'FIEMAP_EXTENT_SHARED' undeclared (first use in 
this function)
cmds-fi-du.c:330: error: (Each undeclared identifier is reported only 
once
cmds-fi-du.c:330: error: for each function it appears in.)
make: *** [cmds-fi-du.o] Error 1

I'm guessing this is probably due to a different GCC version used? I'm 
guessing this is a simple fix for someone with knowhow... :)

-- 
Steven Haigh

Email: netwiz@crc.id.au
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897

Re: btrfs-progs 4.6 won't build on CentOS6

[Jeff Mahoney]

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On 6/23/16 9:49 PM, Steven Haigh wrote:
> I've tried to build the new tools for CentOS 6 / Scientific Linux 6 /
> RHEL 6 etc.
> 
> During the build process, I see:
> cmds-fi-du.c: In function 'du_calc_file_space':
> cmds-fi-du.c:330: error: 'FIEMAP_EXTENT_SHARED' undeclared (first use in
> this function)
> cmds-fi-du.c:330: error: (Each undeclared identifier is reported only once
> cmds-fi-du.c:330: error: for each function it appears in.)
> make: *** [cmds-fi-du.o] Error 1
> 
> I'm guessing this is probably due to a different GCC version used? I'm
> guessing this is a simple fix for someone with knowhow... :)
> 

This is due to too-old headers.  That define was added in 2.6.33.

#define FIEMAP_EXTENT_SHARED            0x00002000 /* Space shared with other
                                                    * files. */

Just add that above that routine and you'll be good to go.  The right fix
is to add it to the tools, ofc.

-Jeff

-- 
Jeff Mahoney
SUSE Labs


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Re: btrfs-progs 4.6 won't build on CentOS6

[Eric Sandeen]

On 6/23/16 8:49 PM, Steven Haigh wrote:
> I've tried to build the new tools for CentOS 6 / Scientific Linux 6 / RHEL 6 etc.
> 
> During the build process, I see:
> cmds-fi-du.c: In function 'du_calc_file_space':
> cmds-fi-du.c:330: error: 'FIEMAP_EXTENT_SHARED' undeclared (first use in this function)
> cmds-fi-du.c:330: error: (Each undeclared identifier is reported only once
> cmds-fi-du.c:330: error: for each function it appears in.)
> make: *** [cmds-fi-du.o] Error 1
> 
> I'm guessing this is probably due to a different GCC version used? I'm guessing this is a simple fix for someone with knowhow... :)

Fair warning, the btrfs.ko in centos6 is positively ancient, and it
won't be updated.

Just in case that matters to you ... not sure if you just want to
build there, or use actually btrfs under a centos6 kernel....

-Eric

Re: btrfs-progs 4.6 won't build on CentOS6

[Qu Wenruo]

At 06/24/2016 11:22 AM, Eric Sandeen wrote:
> On 6/23/16 8:49 PM, Steven Haigh wrote:
>> I've tried to build the new tools for CentOS 6 / Scientific Linux 6 / RHEL 6 etc.
>>
>> During the build process, I see:
>> cmds-fi-du.c: In function 'du_calc_file_space':
>> cmds-fi-du.c:330: error: 'FIEMAP_EXTENT_SHARED' undeclared (first use in this function)
>> cmds-fi-du.c:330: error: (Each undeclared identifier is reported only once
>> cmds-fi-du.c:330: error: for each function it appears in.)
>> make: *** [cmds-fi-du.o] Error 1
>>
>> I'm guessing this is probably due to a different GCC version used? I'm guessing this is a simple fix for someone with knowhow... :)
>
> Fair warning, the btrfs.ko in centos6 is positively ancient, and it
> won't be updated.
>
> Just in case that matters to you ... not sure if you just want to
> build there, or use actually btrfs under a centos6 kernel....
>
> -Eric

This is the new function introduced to calculate shared extents size for 
files/dirs.

Which uses EXTENT_SHARED flag for ioctl, which is not included in old 
kernels.

I have already informed the author several weeks ago, and the fix is 
quite easy.

But it seems that author didn't send out the fix though.

Thanks,
Qu
>
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>

Re: btrfs-progs 4.6 won't build on CentOS6

[Steven Haigh]

On 2016-06-24 13:22, Eric Sandeen wrote:
> On 6/23/16 8:49 PM, Steven Haigh wrote:
>> I've tried to build the new tools for CentOS 6 / Scientific Linux 6 / 
>> RHEL 6 etc.
>> 
>> During the build process, I see:
>> cmds-fi-du.c: In function 'du_calc_file_space':
>> cmds-fi-du.c:330: error: 'FIEMAP_EXTENT_SHARED' undeclared (first use 
>> in this function)
>> cmds-fi-du.c:330: error: (Each undeclared identifier is reported only 
>> once
>> cmds-fi-du.c:330: error: for each function it appears in.)
>> make: *** [cmds-fi-du.o] Error 1
>> 
>> I'm guessing this is probably due to a different GCC version used? I'm 
>> guessing this is a simple fix for someone with knowhow... :)
> 
> Fair warning, the btrfs.ko in centos6 is positively ancient, and it
> won't be updated.
> 
> Just in case that matters to you ... not sure if you just want to
> build there, or use actually btrfs under a centos6 kernel....

Thanks Eric,

Yeah - I understand the stock kernel is ancient in btrfs terms. I build 
4.4.x for Xen Dom0/U usage at my site: http://xen.crc.id.au and have 
done for several years. This is what I'm targeting with this.

-- 
Steven Haigh

Email: netwiz@crc.id.au
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897