Re: Buffer state bits

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Jan Kara wrote:
> BH_Dirty
> - Ideally, this bit should mean "buffer has data that have to be
>   written". But it is not quite true. The problem happens when
>   someone calls set_page_dirty() on the page to which buffers are
>   attached or similarly when buffers are attached to a dirty
>   page. Then all buffers attached to the page are marked dirty -
>   even those that are beyond end of file which obviously should not
>   be written.
> 
>   When buffer is dirty, the page has to be dirty as well (mark
>   buffer dirty takes care of that). It is not necessarily the other
>   way around and buffer dirty bit is what ultimately decides whether
>   the buffer goes to disk or not.

That last sentence implies page can be dirty while a buffer in the
page is not dirty.

In that case, do buffers beyond the end of file need to be set dirty
by set_page_dirty()?  If yes, perhaps the text could explain why.

-- Jamie
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux