[GFS2] Shrink gfs2_inode (7) - di_payload_format

This is almost never used. Its there for backward
compatibility with GFS1. It doesn't need its own
field since it can always be calculated from the
inode mode & flags. This saves a bit more space
in the gfs2_inode.

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

fs/gfs2/dir.c

@@ -902,7 +902,6 @@ static int dir_make_exhash(struct inode *inode)
 	dip->i_di.di_size = sdp->sd_sb.sb_bsize / 2;
 	dip->i_di.di_blocks++;
 	dip->i_di.di_flags |= GFS2_DIF_EXHASH;
-	dip->i_di.di_payload_format = 0;
 
 	for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ;
 	dip->i_di.di_depth = y;

fs/gfs2/inode.c

@@ -210,7 +210,6 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 	di->di_generation = be64_to_cpu(str->di_generation);
 
 	di->di_flags = be32_to_cpu(str->di_flags);
-	di->di_payload_format = be32_to_cpu(str->di_payload_format);
 	di->di_height = be16_to_cpu(str->di_height);
 
 	di->di_depth = be16_to_cpu(str->di_depth);
@@ -699,7 +698,7 @@ static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
 	}
 
 	di->__pad1 = 0;
-	di->di_payload_format = cpu_to_be32(0);
+	di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
 	di->di_height = cpu_to_be32(0);
 	di->__pad2 = 0;
 	di->__pad3 = 0;

fs/gfs2/ondisk.c

@@ -176,9 +176,10 @@ void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 	str->di_generation = cpu_to_be64(di->di_generation);
 
 	str->di_flags = cpu_to_be32(di->di_flags);
-	str->di_payload_format = cpu_to_be32(di->di_payload_format);
 	str->di_height = cpu_to_be16(di->di_height);
-
+	str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
+					     !(ip->i_di.di_flags & GFS2_DIF_EXHASH) ?
+					     GFS2_FORMAT_DE : 0);
 	str->di_depth = cpu_to_be16(di->di_depth);
 	str->di_entries = cpu_to_be32(di->di_entries);
 
@@ -197,7 +198,6 @@ void gfs2_dinode_print(const struct gfs2_inode *ip)
 	printk(KERN_INFO "  di_goal_data = %llu\n", (unsigned long long)di->di_goal_data);
 
 	pv(di, di_flags, "0x%.8X");
-	pv(di, di_payload_format, "%u");
 	pv(di, di_height, "%u");
 
 	pv(di, di_depth, "%u");

fs/gfs2/ops_inode.c

@@ -389,7 +389,6 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 	ip->i_inode.i_nlink = 2;
 	ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 	ip->i_di.di_flags |= GFS2_DIF_JDATA;
-	ip->i_di.di_payload_format = GFS2_FORMAT_DE;
 	ip->i_di.di_entries = 2;
 
 	error = gfs2_meta_inode_buffer(ip, &dibh);

include/linux/gfs2_ondisk.h

@@ -333,7 +333,6 @@ struct gfs2_dinode_host {
 	__u64 di_generation;	/* generation number for NFS */
 
 	__u32 di_flags;	/* GFS2_DIF_... */
-	__u32 di_payload_format;  /* GFS2_FORMAT_... */
 	__u16 di_height;	/* height of metadata */
 
 	/* These only apply to directories  */