On Thu, Mar 05, 2009 at 12:36:59AM +0530, Aneesh Kumar K.V wrote:
> On Tue, Mar 03, 2009 at 10:38:41PM -0600, Eric Sandeen wrote:
> > I was seeing fsck errors on inode bitmaps after a 4 thread
> > dbench run on a 4 cpu machine:
> >
> > Inode bitmap differences: -50736 -(50752--50753) etc...
> >
> > I believe that this is because ext4_free_inode() uses atomic
> > bitops, and although ext4_new_inode() *used* to also use atomic
> > bitops for synchronization, commit
> > 393418676a7602e1d7d3f6e560159c65c8cbd50e changed this to use
> > the sb_bgl_lock, so that we could also synchronize against
> > read_inode_bitmap and initialization of uninit inode tables.
> >
> > However, that change left ext4_free_inode using atomic bitops,
> > which I think leaves no synchronization between setting &
> > unsetting bits in the inode table.
> >
> > The below patch fixes it for me, although I wonder if we're
> > getting at all heavy-handed with this spinlock...
> >
> > Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Added to the ext4 patch queue. I will push this to Linus after I do a
bit of testing.
- Ted
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