[Cluster-devel] [PATCH] GFS2: reserve more blocks for transactions

[Benjamin Marzinski <bmarzins@redhat.com>]

On Tue, Sep 21, 2010 at 04:36:19PM +0100, Steven Whitehouse wrote:
> Hi,
> 
> On Tue, 2010-09-21 at 09:58 -0500, Benjamin Marzinski wrote:
> > Some of the functions in GFS2 were not reserving space in the transaction for
> > the resource group header and the resource groups bitblocks that get added
> > when you do allocation. GFS2 now makes sure to reserve space for the
> > resource group header and either all the bitblocks in the resource group, or
> > one for each block that it may allocate, whichever is smaller.
> > 
> > Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
> > ---
> >  fs/gfs2/aops.c  |    3 +++
> >  fs/gfs2/bmap.c  |    2 +-
> >  fs/gfs2/file.c  |    5 ++++-
> >  fs/gfs2/quota.c |    2 ++
> >  4 files changed, 10 insertions(+), 2 deletions(-)
> > 
> > Index: gfs2-2.6-nmw/fs/gfs2/aops.c
> > ===================================================================
> > --- gfs2-2.6-nmw.orig/fs/gfs2/aops.c
> > +++ gfs2-2.6-nmw/fs/gfs2/aops.c
> > @@ -663,6 +663,9 @@ static int gfs2_write_begin(struct file 
> >  		rblocks += RES_STATFS + RES_QUOTA;
> >  	if (&ip->i_inode == sdp->sd_rindex)
> >  		rblocks += 2 * RES_STATFS;
> > +	if (alloc_required)
> > +		rblocks += (al->al_requested < al->al_rgd->rd_length)?
> > +			   al->al_requested + 1 : al->al_rgd->rd_length;
> Since this bit seems to occur multiple times, perhaps you could turn it
> into an inline function with a suitably explanatory name? That should
> make it a bit easier to understand what it is doing,

Sure

-Ben

> 
> Steve.
> 
> >  
> >  	error = gfs2_trans_begin(sdp, rblocks,
> >  				 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
> > Index: gfs2-2.6-nmw/fs/gfs2/bmap.c
> > ===================================================================
> > --- gfs2-2.6-nmw.orig/fs/gfs2/bmap.c
> > +++ gfs2-2.6-nmw/fs/gfs2/bmap.c
> > @@ -1151,7 +1151,7 @@ static int do_grow(struct inode *inode, 
> >  			goto do_grow_qunlock;
> >  	}
> >  
> > -	error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
> > +	error = gfs2_trans_begin(sdp, RES_DINODE + RES_STATFS + RES_RG_BIT, 0);
> >  	if (error)
> >  		goto do_grow_release;
> >  
> > Index: gfs2-2.6-nmw/fs/gfs2/file.c
> > ===================================================================
> > --- gfs2-2.6-nmw.orig/fs/gfs2/file.c
> > +++ gfs2-2.6-nmw/fs/gfs2/file.c
> > @@ -382,8 +382,11 @@ static int gfs2_page_mkwrite(struct vm_a
> >  	rblocks = RES_DINODE + ind_blocks;
> >  	if (gfs2_is_jdata(ip))
> >  		rblocks += data_blocks ? data_blocks : 1;
> > -	if (ind_blocks || data_blocks)
> > +	if (ind_blocks || data_blocks) {
> >  		rblocks += RES_STATFS + RES_QUOTA;
> > +		rblocks += (al->al_requested < al->al_rgd->rd_length)?
> > +			   al->al_requested + 1 : al->al_rgd->rd_length;
> > +	}
> >  	ret = gfs2_trans_begin(sdp, rblocks, 0);
> >  	if (ret)
> >  		goto out_trans_fail;
> > Index: gfs2-2.6-nmw/fs/gfs2/quota.c
> > ===================================================================
> > --- gfs2-2.6-nmw.orig/fs/gfs2/quota.c
> > +++ gfs2-2.6-nmw/fs/gfs2/quota.c
> > @@ -1586,6 +1586,8 @@ static int gfs2_set_dqblk(struct super_b
> >  		error = gfs2_inplace_reserve(ip);
> >  		if (error)
> >  			goto out_alloc;
> > +		blocks += (al->al_requested < al->al_rgd->rd_length)?
> > +			  al->al_requested + 1 : al->al_rgd->rd_length;
> >  	}
> >  
> >  	error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);
> > 
>