93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/*****************************************************************************
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* dentry.c
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* dentry operations.
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*
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* Apple II DOS 3.3 Filesystem Driver for Linux 2.4.x
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* Copyright (c) 2001 Vince Weaver
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* Copyright (c) 2001 Matt Jensen.
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* This program is free software distributed under the terms of the GPL.
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*****************************************************************************/
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/*= Kernel Includes ========================================================*/
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#include <linux/time.h>
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#include <linux/fs.h>
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/*= DOS 3.3 Includes =======================================================*/
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#include "dos33.h"
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/*= Forward Declarations ====================================================*/
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/* For dos33_dentry_operations. */
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int dos33_hash_dentry(struct dentry *,struct qstr *);
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int dos33_compare_dentry(struct dentry *,struct qstr *,struct qstr *);
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/*= Preprocessor Macros =====================================================*/
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/*= VFS Interface Structures ================================================*/
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struct dentry_operations dos33_dentry_operations = {
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d_hash: dos33_hash_dentry,
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d_compare: dos33_compare_dentry
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};
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/*= Private Functions =======================================================*/
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/*= Interface Functions =====================================================*/
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/*****************************************************************************
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* dos33_hash_dentry()
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* Check a name for validity under DOS33 naming rules; if it is valid, hash
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* it.
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*****************************************************************************/
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int dos33_hash_dentry(struct dentry *de,struct qstr *qstr) {
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unsigned long hash = 0;
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int len = 0;
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int i = 0;
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/* Ensure that we have a valid ProDOS name. */
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i = dos33_check_name(qstr);
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if (i) return i;
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/* Hash the name. */
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if (len>DOS33_MAX_NAME_LEN) len=DOS33_MAX_NAME_LEN;
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hash = init_name_hash();
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for(i = 0;i < len;i++) hash = partial_name_hash(qstr->name[i],hash);
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qstr->hash = end_name_hash(hash);
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return 0;
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}
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/*****************************************************************************
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* dos33_compare_dentry()
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* Compare two hashed DOS 3.3 names.
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*****************************************************************************/
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int dos33_compare_dentry(struct dentry *de,struct qstr *q1,struct qstr *q2) {
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int len = 0;
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int i = 0;
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/* q2 has not been validated yet. */
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i = dos33_check_name(q2);
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if (i) return i;
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/* Ignore characters past the maximum DOS 3.3 name length. */
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len = q1->len;
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if (q1->len >= DOS33_MAX_NAME_LEN) {
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if (q2->len < DOS33_MAX_NAME_LEN) return 1;
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len = DOS33_MAX_NAME_LEN;
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}
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else if (len != q2->len) return ~0;
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/* Compare the strings. */
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for (i = 0;i < len;i++) {
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if (q1->name[i] != q2->name[i]) return ~0;
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}
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return 0;
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}
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