[GFS2] Fix for root inode ref count bug

Umount is now working correctly again. The bug was due to
not getting an extra ref count when mounting the fs. We
should have bumped it by two (once for the internal pointer
to the root inode from the super block and once for the
inode hanging off the dcache entry for root).

Also this patch tidys up the code dealing with looking up
and creating inodes. We now pass Linux inodes (with gfs2_inodes
attached) rather than the other way around and this reduces code
duplication in various places.

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

1 files changed, 18 insertions, 49 deletions

diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 6fff30ef8b70..9fb9490eb67a 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -49,7 +49,7 @@
 static int gfs2_create(struct inode *dir, struct dentry *dentry,
 		       int mode, struct nameidata *nd)
 {
-	struct gfs2_inode *dip = get_v2ip(dir), *ip;
+	struct gfs2_inode *dip = get_v2ip(dir);
 	struct gfs2_sbd *sdp = dip->i_sbd;
 	struct gfs2_holder ghs[2];
 	struct inode *inode;
@@ -61,9 +61,8 @@ static int gfs2_create(struct inode *dir, struct dentry *dentry,
 	gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 
 	for (;;) {
-		error = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
-		if (!error) {
-			ip = get_gl2ip(ghs[1].gh_gl);
+		inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
+		if (!IS_ERR(inode)) {
 			gfs2_trans_end(sdp);
 			if (dip->i_alloc.al_rgd)
 				gfs2_inplace_release(dip);
@@ -71,13 +70,13 @@ static int gfs2_create(struct inode *dir, struct dentry *dentry,
 			gfs2_alloc_put(dip);
 			gfs2_glock_dq_uninit_m(2, ghs);
 			break;
-		} else if (error != -EEXIST ||
+		} else if (PTR_ERR(inode) != -EEXIST ||
 			   (nd->intent.open.flags & O_EXCL)) {
 			gfs2_holder_uninit(ghs);
-			return error;
+			return PTR_ERR(inode);
 		}
 
-		error = gfs2_lookupi(dip, &dentry->d_name, 0, &ip);
+		error = gfs2_lookupi(dir, &dentry->d_name, 0, &inode);
 		if (!error) {
 			new = 0;
 			gfs2_holder_uninit(ghs);
@@ -88,12 +87,6 @@ static int gfs2_create(struct inode *dir, struct dentry *dentry,
 		}
 	}
 
-	inode = gfs2_ip2v(ip);
-	gfs2_inode_put(ip);
-
-	if (!inode)
-		return -ENOMEM;
-
 	d_instantiate(dentry, inode);
 	if (new)
 		mark_inode_dirty(inode);
@@ -115,7 +108,7 @@ static int gfs2_create(struct inode *dir, struct dentry *dentry,
 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 				  struct nameidata *nd)
 {
-	struct gfs2_inode *dip = get_v2ip(dir), *ip;
+	struct gfs2_inode *dip = get_v2ip(dir);
 	struct gfs2_sbd *sdp = dip->i_sbd;
 	struct inode *inode = NULL;
 	int error;
@@ -125,14 +118,8 @@ static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 	if (!sdp->sd_args.ar_localcaching)
 		dentry->d_op = &gfs2_dops;
 
-	error = gfs2_lookupi(dip, &dentry->d_name, 0, &ip);
-	if (!error) {
-		inode = gfs2_ip2v(ip);
-		gfs2_inode_put(ip);
-		if (!inode)
-			return ERR_PTR(-ENOMEM);
-
-	} else if (error != -ENOENT)
+	error = gfs2_lookupi(dir, &dentry->d_name, 0, &inode);
+	if (error && error != -ENOENT)
 		return ERR_PTR(error);
 
 	if (inode)
@@ -367,10 +354,10 @@ static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 
 	gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 
-	error = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
-	if (error) {
+	inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
+	if (IS_ERR(inode)) {
 		gfs2_holder_uninit(ghs);
-		return error;
+		return PTR_ERR(inode);
 	}
 
 	ip = get_gl2ip(ghs[1].gh_gl);
@@ -394,12 +381,6 @@ static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 
 	gfs2_glock_dq_uninit_m(2, ghs);
 
-	inode = gfs2_ip2v(ip);
-	gfs2_inode_put(ip);
-
-	if (!inode)
-		return -ENOMEM;
-
 	d_instantiate(dentry, inode);
 	mark_inode_dirty(inode);
 
@@ -428,10 +409,10 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 
 	gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 
-	error = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
-	if (error) {
+	inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
+	if (IS_ERR(inode)) {
 		gfs2_holder_uninit(ghs);
-		return error;
+		return PTR_ERR(inode);
 	}
 
 	ip = get_gl2ip(ghs[1].gh_gl);
@@ -481,12 +462,6 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 
 	gfs2_glock_dq_uninit_m(2, ghs);
 
-	inode = gfs2_ip2v(ip);
-	gfs2_inode_put(ip);
-
-	if (!inode)
-		return -ENOMEM;
-
 	d_instantiate(dentry, inode);
 	mark_inode_dirty(inode);
 
@@ -598,10 +573,10 @@ static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 
 	gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 
-	error = gfs2_createi(ghs, &dentry->d_name, mode);
-	if (error) {
+	inode = gfs2_createi(ghs, &dentry->d_name, mode);
+	if (IS_ERR(inode)) {
 		gfs2_holder_uninit(ghs);
-		return error;
+		return PTR_ERR(inode);
 	}
 
 	ip = get_gl2ip(ghs[1].gh_gl);
@@ -624,12 +599,6 @@ static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 
 	gfs2_glock_dq_uninit_m(2, ghs);
 
-	inode = gfs2_ip2v(ip);
-	gfs2_inode_put(ip);
-
-	if (!inode)
-		return -ENOMEM;
-
 	d_instantiate(dentry, inode);
 	mark_inode_dirty(inode);