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# [Cluster-devel] GFS2: Consolidate transaction blocks calculation for dir add

• From: Steven Whitehouse <swhiteho redhat com>
• To: cluster-devel redhat com
• Subject: [Cluster-devel] GFS2: Consolidate transaction blocks calculation for dir add
• Date: Mon, 06 Jan 2014 14:54:52 +0000

```>From 534cf9ca553953e4c12fa5f0d23e543f9a6ccbaf Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho redhat com>
Date: Mon, 6 Jan 2014 12:03:05 +0000
Subject: GFS2: Consolidate transaction blocks calculation for dir add

There are three cases where we need to calculate the number of
blocks to reserve in a transaction involving linking an inode
into a directory. The one in rename is a bit more complicated,
but the basis of it is the same as for link and create. So it
makes sense to move this calculation into a single function
rather than repeating it three times.

Signed-off-by: Steven Whitehouse <swhiteho redhat com>

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 9ac8f13..fa4624f 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -469,6 +469,28 @@ static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
brelse(dibh);
}

+/**
+ * gfs2_trans_da_blocks - Calculate number of blocks to link inode
+ * @dip: The directory we are linking into
+ * @da: The dir add information
+ * @nr_inodes: The number of inodes involved
+ *
+ * This calculate the number of blocks we need to reserve in a
+ * transaction to link @nr_inodes into a directory. In most cases
+ * @nr_inodes will be 2 (the directory plus the inode being linked in)
+ * but in case of rename, 4 may be required.
+ *
+ * Returns: Number of blocks
+ */
+
+static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
+				   const struct gfs2_diradd *da,
+				   unsigned nr_inodes)
+{
+	return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
+	       (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
+}
+
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
struct gfs2_inode *ip, struct gfs2_diradd *da)
{
@@ -485,10 +507,7 @@ static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
if (error)
goto fail_quota_locks;

-		error = gfs2_trans_begin(sdp, da->nr_blocks +
-					 gfs2_rg_blocks(dip, da->nr_blocks) +
-					 2 * RES_DINODE +
-					 RES_STATFS + RES_QUOTA, 0);
+		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
if (error)
goto fail_ipreserv;
} else {
@@ -886,10 +905,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
if (error)
goto out_gunlock_q;

-		error = gfs2_trans_begin(sdp, da.nr_blocks +
-					 gfs2_rg_blocks(dip, da.nr_blocks) +
-					 2 * RES_DINODE + RES_STATFS +
-					 RES_QUOTA, 0);
+		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
if (error)
goto out_ipres;
} else {
@@ -1403,10 +1419,8 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
if (error)
goto out_gunlock_q;

-		error = gfs2_trans_begin(sdp, da.nr_blocks +
-					 gfs2_rg_blocks(ndip, da.nr_blocks) +
-					 4 * RES_DINODE + 4 * RES_LEAF +
-					 RES_STATFS + RES_QUOTA + 4, 0);
+		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
+					 4 * RES_LEAF + 4, 0);
if (error)
goto out_ipreserv;
} else {
--
1.8.3.1

```

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