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GFS2: Add Orlov allocator

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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>
This commit is contained in:
Steven Whitehouse
2012-10-31 10:37:10 +00:00
parent c9aecf7371
commit 9dbe9610b9
8 changed files with 38 additions and 15 deletions
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2
fs/gfs2/xattr.c
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@@ -734,7 +734,7 @@ static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
if (error)
return error;
error = gfs2_inplace_reserve(ip, blks);
error = gfs2_inplace_reserve(ip, blks, 0);
if (error)
goto out_gunlock_q;