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/*
* 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);
}
}
}
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