[PATCH] erofs-utils: lib: add support for symlink file in erofs_ilookup()

[Gao Xiang]

On 2024/8/12 10:50, Hongzhen Luo wrote:
> 
> On 2024/8/12 10:24, Gao Xiang wrote:
>>
>>
>> On 2024/8/11 16:09, Hongzhen Luo wrote:
>>> When the `path` contains symbolic links, erofs_ilookup() does not
>>> function properly. This adds support for symlink files.
>>
>> Can you explain what's the use cases of this patch?
>>
>> It seems both erofsfuse and fsck.erofs --extract don't need this.
>>
> Some third-party applications (such as Alibaba DADI) require obtaining block mapping information of files based on their paths using liberofs. When file paths include symbolic links, the current erofs_ilookup() function fails to correctly locate the inode. This submission enhances erofs_ilookup()'s support for symbolic link files.

Why it cannot be implemented in the application itself?
Following block mapping and obtain the symlinked file block
mapping is weird for erofs itself to resolve.

Thanks,
Gao Xiang