1 files changed, 103 insertions, 0 deletions
diff --git a/fs/hfs/sysdep.c b/fs/hfs/sysdep.c
new file mode 100644
index 000000000..fc7368a75
--- /dev/null
+++ b/fs/hfs/sysdep.c
@@ -0,0 +1,103 @@
+/*
+ * linux/fs/hfs/sysdep.c
+ *
+ * Copyright (C) 1996  Paul H. Hargrove
+ * This file may be distributed under the terms of the GNU Public License.
+ *
+ * This file contains the code to do various system dependent things.
+ *
+ * "XXX" in a comment is a note to myself to consider changing something.
+ *
+ * In function preconditions the term "valid" applied to a pointer to
+ * a structure means that the pointer is non-NULL and the structure it
+ * points to has all fields initialized to consistent values.
+ */
+
+#include "hfs.h"
+#include <linux/hfs_fs_sb.h>
+#include <linux/hfs_fs_i.h>
+#include <linux/hfs_fs.h>
+
+static int hfs_hash_dentry(struct dentry *, struct qstr *);
+static int hfs_compare_dentry (struct dentry *, struct qstr *, struct qstr *);
+struct dentry_operations hfs_dentry_operations =
+{
+	NULL,	                /* d_validate(struct dentry *) */
+	hfs_hash_dentry,	/* d_hash */
+	hfs_compare_dentry,    	/* d_compare */
+	NULL	                /* d_delete(struct dentry *) */
+};
+
+/*
+ * hfs_buffer_get()
+ *
+ * Return a buffer for the 'block'th block of the media.
+ * If ('read'==0) then the buffer is not read from disk.
+ */
+hfs_buffer hfs_buffer_get(hfs_sysmdb sys_mdb, int block, int read) {
+	hfs_buffer tmp = HFS_BAD_BUFFER;
+
+	if (read) {
+		tmp = bread(sys_mdb->s_dev, block, HFS_SECTOR_SIZE);
+	} else {
+		tmp = getblk(sys_mdb->s_dev, block, HFS_SECTOR_SIZE);
+		if (tmp) {
+			mark_buffer_uptodate(tmp, 1);
+		}
+	}
+	if (!tmp) {
+		hfs_error("hfs_fs: unable to read block 0x%08x from dev %s\n",
+			  block, hfs_mdb_name(sys_mdb));
+	}
+
+	return tmp;
+}
+
+/* dentry case-handling: just lowercase everything */
+
+/* should we use hfs_strhash? if so, it probably needs to be beefed 
+ * up a little. */
+static int hfs_hash_dentry(struct dentry *dentry, struct qstr *this)
+{
+        unsigned char name[HFS_NAMELEN];
+	int len = this->len;
+	
+	if (len > HFS_NAMELEN)
+	        return 0;
+  
+	strncpy(name, this->name, len);
+	hfs_tolower(name, len);
+	this->hash = full_name_hash(name, len);
+	return 0;
+}
+
+static int hfs_compare_dentry(struct dentry *dentry, struct qstr *a, 
+			      struct qstr *b)
+{
+	struct hfs_name s1, s2;
+
+	if (a->len != b->len) return 1;
+
+	if ((s1.Len = s2.Len = a->len) > HFS_NAMELEN)
+	  return 1;
+
+	strncpy(s1.Name, a->name, s1.Len);
+	strncpy(s2.Name, b->name, s2.Len);
+	return hfs_streq(&s1, &s2);
+}
+
+
+/* toss a catalog entry. this does it by dropping the dentry. */
+void hfs_cat_prune(struct hfs_cat_entry *entry)
+{
+        int i;
+
+	for (i = 0; i < 4; i++) {
+	       struct dentry *de = entry->sys_entry[i];
+	       if (de) {
+			dget(de);
+		 	d_drop(de);
+		 	dput(de);
+	       }
+	}
+}