[GFS2] Remove i_mode passing from NFS File Handle

GFS2 has been passing i_mode within NFS File Handle. Other than the
wrong assumption that there is always room for this extra 16 bit value,
the current gfs2_get_dentry doesn't really need the i_mode to work
correctly. Note that GFS2 NFS code does go thru the same lookup code
path as direct file access route (where the mode is obtained from name
lookup) but gfs2_get_dentry() is coded for different purpose. It is not
used during lookup time. It is part of the file access procedure call.
When the call is invoked, if on-disk inode is not in-memory, it has to
be read-in. This makes i_mode passing a useless overhead.

Signed-off-by: S. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 15 insertions, 23 deletions

diff --git a/fs/gfs2/ops_export.c b/fs/gfs2/ops_export.c
index 0fe14478a54d..e317db2a5548 100644
--- a/fs/gfs2/ops_export.c
+++ b/fs/gfs2/ops_export.c
@@ -27,12 +27,7 @@
 #include "util.h"
 
 #define GFS2_SMALL_FH_SIZE 4
-#define GFS2_LARGE_FH_SIZE 10
-
-struct gfs2_fh_obj {
-	struct gfs2_inum_host this;
-	u32 imode;
-};
+#define GFS2_LARGE_FH_SIZE 8
 
 static struct dentry *gfs2_decode_fh(struct super_block *sb,
 				     __u32 *p,
@@ -43,11 +38,8 @@ static struct dentry *gfs2_decode_fh(struct super_block *sb,
 				     void *context)
 {
 	__be32 *fh = (__force __be32 *)p;
-	struct gfs2_fh_obj fh_obj;
-	struct gfs2_inum_host *this, parent;
+	struct gfs2_inum_host inum, parent;
 
-	this 		= &fh_obj.this;
-	fh_obj.imode 	= DT_UNKNOWN;
 	memset(&parent, 0, sizeof(struct gfs2_inum));
 
 	switch (fh_len) {
@@ -56,18 +48,17 @@ static struct dentry *gfs2_decode_fh(struct super_block *sb,
 		parent.no_formal_ino |= be32_to_cpu(fh[5]);
 		parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
 		parent.no_addr |= be32_to_cpu(fh[7]);
-		fh_obj.imode = be32_to_cpu(fh[8]);
 	case GFS2_SMALL_FH_SIZE:
-		this->no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
-		this->no_formal_ino |= be32_to_cpu(fh[1]);
-		this->no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
-		this->no_addr |= be32_to_cpu(fh[3]);
+		inum.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
+		inum.no_formal_ino |= be32_to_cpu(fh[1]);
+		inum.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
+		inum.no_addr |= be32_to_cpu(fh[3]);
 		break;
 	default:
 		return NULL;
 	}
 
-	return gfs2_export_ops.find_exported_dentry(sb, &fh_obj, &parent,
+	return gfs2_export_ops.find_exported_dentry(sb, &inum, &parent,
 						    acceptable, context);
 }
 
@@ -102,9 +93,6 @@ static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
 	fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
 	fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
 	fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
-
-	fh[8]  = cpu_to_be32(inode->i_mode);
-	fh[9]  = 0;	/* pad to double word */
 	*len = GFS2_LARGE_FH_SIZE;
 
 	iput(inode);
@@ -201,8 +189,7 @@ static struct dentry *gfs2_get_parent(struct dentry *child)
 static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
 {
 	struct gfs2_sbd *sdp = sb->s_fs_info;
-	struct gfs2_fh_obj *fh_obj = (struct gfs2_fh_obj *)inum_obj;
-	struct gfs2_inum_host *inum = &fh_obj->this;
+	struct gfs2_inum_host *inum = inum_obj;
 	struct gfs2_holder i_gh, ri_gh, rgd_gh;
 	struct gfs2_rgrpd *rgd;
 	struct inode *inode;
@@ -245,9 +232,9 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
 	gfs2_glock_dq_uninit(&rgd_gh);
 	gfs2_glock_dq_uninit(&ri_gh);
 
-	inode = gfs2_inode_lookup(sb, fh_obj->imode,
+	inode = gfs2_inode_lookup(sb, DT_UNKNOWN,
 					inum->no_addr,
-					inum->no_formal_ino);
+					0);
 	if (!inode)
 		goto fail;
 	if (IS_ERR(inode)) {
@@ -260,6 +247,11 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
 		iput(inode);
 		goto fail;
 	}
+
+	/* Pick up the works we bypass in gfs2_inode_lookup */
+	if (inode->i_state & I_NEW) 
+		gfs2_set_iop(inode);
+
 	if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
 		iput(inode);
 		goto fail;