linux-ext4 - Re: d_off field in struct dirent and 32-on-64 emulation

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Message-ID: <ae0530c9-5c46-5560-9734-1eacaf173b8d@linaro.org>
Date:   Fri, 28 Dec 2018 09:53:21 -0200
From:   Adhemerval Zanella <adhemerval.zanella@...aro.org>
To:     Florian Weimer <fw@...eb.enyo.de>
Cc:     linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net, libc-alpha@...rceware.org,
        qemu-devel@...gnu.org, ericvh@...il.com, rminnich@...dia.gov,
        lucho@...kov.net, hpa@...or.com, arnd@...db.de
Subject: Re: d_off field in struct dirent and 32-on-64 emulation



On 27/12/2018 16:09, Florian Weimer wrote:
> * Adhemerval Zanella:
> 
>> Also for glibc standpoint, although reverting it back to use getdents 
>> syscall for non-LFS mode might fix this issue for architectures that
>> provides non-LFS getdents syscall it won't be a fix for architectures 
>> that still provides off_t different than off64_t *and* only provides 
>> getdents64 syscall.
>>
>> Currently we only have nios2 and csky (unfortunately).  But since generic 
>> definition for off_t and off64_t still assumes non-LFS support, all new
>> 32-bits ports potentially might carry the issue.
> 
> For csky, we could still change the type of the non-standard d_off
> field to long long int.  This way, only telldir would have to fail
> when truncation is necessary, as mentioned below:

I think it makes no sense to continue making non-LFS as default for
newer 32 bits ports, the support will be emulated with LFS syscalls.