ocfs2: Optimize inode allocation by remembering last group

In ocfs2, the inode block search looks for the "emptiest" inode
group to allocate from. So if an inode alloc file has many equally
(or almost equally) empty groups, new inodes will tend to get
spread out amongst them, which in turn can put them all over the
disk. This is undesirable because directory operations on conceptually
"nearby" inodes force a large number of seeks.

So we add ip_last_used_group in core directory inodes which records
the last used allocation group. Another field named ip_last_used_slot
is also added in case inode stealing happens. When claiming new inode,
we passed in directory's inode so that the allocation can use this
information.
For more details, please see
http://oss.oracle.com/osswiki/OCFS2/DesignDocs/InodeAllocationStrategy.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

5 files changed, 46 insertions, 2 deletions

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index f1f77b2f5947..4a88bce35079 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -352,6 +352,8 @@ void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 
         ocfs2_set_inode_flags(inode);
 
+        OCFS2_I(inode)->ip_last_used_slot = 0;
+        OCFS2_I(inode)->ip_last_used_group = 0;
         mlog_exit_void();
 }
 
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index eb3c302b38d3..e1978acbf65e 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -72,6 +72,10 @@ struct ocfs2_inode_info
 
         struct inode                    vfs_inode;
         struct jbd2_inode               ip_jinode;
+
+        /* Only valid if the inode is the dir. */
+        u32                             ip_last_used_slot;
+        u64                             ip_last_used_group;
 };
 
 /*
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 58c318d2f061..2220f93f668b 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -485,8 +485,8 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 
         *new_fe_bh = NULL;
 
-        status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
-                                       &fe_blkno);
+        status = ocfs2_claim_new_inode(osb, handle, dir, parent_fe_bh,
+                                       inode_ac, &suballoc_bit, &fe_blkno);
         if (status < 0) {
                 mlog_errno(status);
                 goto leave;
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index a69628603e18..487f00c45f84 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -1618,8 +1618,41 @@ bail:
         return status;
 }
 
+static void ocfs2_init_inode_ac_group(struct inode *dir,
+                                      struct buffer_head *parent_fe_bh,
+                                      struct ocfs2_alloc_context *ac)
+{
+        struct ocfs2_dinode *fe = (struct ocfs2_dinode *)parent_fe_bh->b_data;
+        /*
+         * Try to allocate inodes from some specific group.
+         *
+         * If the parent dir has recorded the last group used in allocation,
+         * cool, use it. Otherwise if we try to allocate new inode from the
+         * same slot the parent dir belongs to, use the same chunk.
+         *
+         * We are very careful here to avoid the mistake of setting
+         * ac_last_group to a group descriptor from a different (unlocked) slot.
+         */
+        if (OCFS2_I(dir)->ip_last_used_group &&
+            OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
+                ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
+        else if (le16_to_cpu(fe->i_suballoc_slot) == ac->ac_alloc_slot)
+                ac->ac_last_group = ocfs2_which_suballoc_group(
+                                        le64_to_cpu(fe->i_blkno),
+                                        le16_to_cpu(fe->i_suballoc_bit));
+}
+
+static inline void ocfs2_save_inode_ac_group(struct inode *dir,
+                                             struct ocfs2_alloc_context *ac)
+{
+        OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
+        OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
+}
+
 int ocfs2_claim_new_inode(struct ocfs2_super *osb,
                           handle_t *handle,
+                          struct inode *dir,
+                          struct buffer_head *parent_fe_bh,
                           struct ocfs2_alloc_context *ac,
                           u16 *suballoc_bit,
                           u64 *fe_blkno)
@@ -1635,6 +1668,8 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
         BUG_ON(ac->ac_bits_wanted != 1);
         BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
 
+        ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
+
         status = ocfs2_claim_suballoc_bits(osb,
                                            ac,
                                            handle,
@@ -1653,6 +1688,7 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
 
         *fe_blkno = bg_blkno + (u64) (*suballoc_bit);
         ac->ac_bits_given++;
+        ocfs2_save_inode_ac_group(dir, ac);
         status = 0;
 bail:
         mlog_exit(status);
diff --git a/fs/ocfs2/suballoc.h b/fs/ocfs2/suballoc.h
index e3c13c77f9e8..ea85a4c8b4b1 100644
--- a/fs/ocfs2/suballoc.h
+++ b/fs/ocfs2/suballoc.h
@@ -88,6 +88,8 @@ int ocfs2_claim_metadata(struct ocfs2_super *osb,
                          u64 *blkno_start);
 int ocfs2_claim_new_inode(struct ocfs2_super *osb,
                           handle_t *handle,
+                          struct inode *dir,
+                          struct buffer_head *parent_fe_bh,
                           struct ocfs2_alloc_context *ac,
                           u16 *suballoc_bit,
                           u64 *fe_blkno);