GFS2: Add Orlov allocator
Just like ext3, this works on the root directory and any directory
with the +T flag set. Also, just like ext3, any subdirectory created
in one of the just mentioned cases will be allocated to a random
resource group (GFS2 equivalent of a block group).
If you are creating a set of directories, each of which will contain a
job running on a different node, then by setting +T on the parent
directory before creating the subdirectories, each will land up in a
different resource group, and thus resource group contention between
nodes will be kept to a minimum.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 749b05a..ef3ce00 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -385,13 +385,13 @@
inode->i_gid = current_fsgid();
}
-static int alloc_dinode(struct gfs2_inode *ip)
+static int alloc_dinode(struct gfs2_inode *ip, u32 flags)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
int error;
int dblocks = 1;
- error = gfs2_inplace_reserve(ip, RES_DINODE);
+ error = gfs2_inplace_reserve(ip, RES_DINODE, flags);
if (error)
goto out;
@@ -560,7 +560,7 @@
if (error)
goto fail_quota_locks;
- error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
+ error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
if (error)
goto fail_quota_locks;
@@ -650,6 +650,7 @@
struct gfs2_glock *io_gl;
int error;
struct buffer_head *bh = NULL;
+ u32 aflags = 0;
if (!name->len || name->len > GFS2_FNAMESIZE)
return -ENAMETOOLONG;
@@ -685,7 +686,11 @@
munge_mode_uid_gid(dip, inode);
ip->i_goal = dip->i_goal;
- error = alloc_dinode(ip);
+ if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
+ (dip->i_diskflags & GFS2_DIF_TOPDIR))
+ aflags |= GFS2_AF_ORLOV;
+
+ error = alloc_dinode(ip, aflags);
if (error)
goto fail_free_inode;
@@ -897,7 +902,7 @@
if (error)
goto out_gunlock;
- error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
+ error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
if (error)
goto out_gunlock_q;
@@ -1378,7 +1383,7 @@
if (error)
goto out_gunlock;
- error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres);
+ error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0);
if (error)
goto out_gunlock_q;