[PATCH] get rid of on-stack dentry in udf

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/udf/namei.c

@@ -142,7 +142,7 @@ int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
 }
 
 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
-					    struct dentry *dentry,
+					    struct qstr *child,
 					    struct udf_fileident_bh *fibh,
 					    struct fileIdentDesc *cfi)
 {
@@ -159,8 +159,8 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 	sector_t offset;
 	struct extent_position epos = {};
 	struct udf_inode_info *dinfo = UDF_I(dir);
-	int isdotdot = dentry->d_name.len == 2 &&
-		dentry->d_name.name[0] == '.' && dentry->d_name.name[1] == '.';
+	int isdotdot = child->len == 2 &&
+		child->name[0] == '.' && child->name[1] == '.';
 
 	size = udf_ext0_offset(dir) + dir->i_size;
 	f_pos = udf_ext0_offset(dir);
@@ -238,8 +238,7 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 			continue;
 
 		flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
-		if (flen && udf_match(flen, fname, dentry->d_name.len,
-				      dentry->d_name.name))
+		if (flen && udf_match(flen, fname, child->len, child->name))
 			goto out_ok;
 	}
 
@@ -283,7 +282,7 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 	} else
 #endif /* UDF_RECOVERY */
 
-	if (udf_find_entry(dir, dentry, &fibh, &cfi)) {
+	if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
 		if (fibh.sbh != fibh.ebh)
 			brelse(fibh.ebh);
 		brelse(fibh.sbh);
@@ -783,7 +782,7 @@ static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 
 	retval = -ENOENT;
 	lock_kernel();
-	fi = udf_find_entry(dir, dentry, &fibh, &cfi);
+	fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 	if (!fi)
 		goto out;
 
@@ -829,7 +828,7 @@ static int udf_unlink(struct inode *dir, struct dentry *dentry)
 
 	retval = -ENOENT;
 	lock_kernel();
-	fi = udf_find_entry(dir, dentry, &fibh, &cfi);
+	fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 	if (!fi)
 		goto out;
 
@@ -1113,7 +1112,7 @@ static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct udf_inode_info *old_iinfo = UDF_I(old_inode);
 
 	lock_kernel();
-	ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
+	ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
 	if (ofi) {
 		if (ofibh.sbh != ofibh.ebh)
 			brelse(ofibh.ebh);
@@ -1124,7 +1123,7 @@ static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
 	    != old_inode->i_ino)
 		goto end_rename;
 
-	nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
+	nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
 	if (nfi) {
 		if (!new_inode) {
 			if (nfibh.sbh != nfibh.ebh)
@@ -1192,7 +1191,7 @@ static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
 	udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
 
 	/* The old fid may have moved - find it again */
-	ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
+	ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
 	udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
 
 	if (new_inode) {
@@ -1244,13 +1243,10 @@ end_rename:
 static struct dentry *udf_get_parent(struct dentry *child)
 {
 	struct inode *inode = NULL;
-	struct dentry dotdot;
+	struct qstr dotdot = {.name = "..", .len = 2};
 	struct fileIdentDesc cfi;
 	struct udf_fileident_bh fibh;
 
-	dotdot.d_name.name = "..";
-	dotdot.d_name.len = 2;
-
 	lock_kernel();
 	if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
 		goto out_unlock;