Re: [PATCH] Fix sync. in inode_has_no_xattr()

[Alexander Lochmann]

Am 05.12.18 um 16:32 schrieb Jan Kara:
> 
> Thinking more about this I'm not sure if this is actually the right
> solution. Because for example the write(2) can set S_NOSEC flag wrongly
> when it would race with chmod adding SUID bit. So probably we rather need
> to acquire i_rwsem in blkdev_write_iter() if file does not have S_NOSEC set
> (we don't want to acquire it unconditionally as that would heavily impact
> scalability of block device writes).
> 
> 								Honza
> 
Trying to implement your suggestion, I'm not sure which inode to use:
In blkdev_write_iter() there is the "bd_inode = bdev_file_inode(file)".
file_remove_privs() uses "inode = file_inode(file)" as a parameter for
inode_has_no_xattr().
So, do file->f_mapping->host and f->f_inode refer to the identical inode?

- Alex

-- 
Technische UniversitÃt Dortmund
Alexander Lochmann                PGP key: 0xBC3EF6FD
Otto-Hahn-Str. 16                 phone:  +49.231.7556141
D-44227 Dortmund                  fax:    +49.231.7556116
http://ess.cs.tu-dortmund.de/Staff/al

Attachment: signature.asc
Description: OpenPGP digital signature