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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 *);
static void hfs_dentry_iput(struct dentry *, struct inode *);
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 *) */
NULL, /* d_release(struct dentry *) */
hfs_dentry_iput /* d_iput(struct dentry *, struct inode *) */
};
/*
* 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 */
/* hfs_strhash now uses the same hashing function as the dcache. */
static int hfs_hash_dentry(struct dentry *dentry, struct qstr *this)
{
struct hfs_name cname;
if ((cname.Len = this->len) > HFS_NAMELEN)
return 0;
strncpy(cname.Name, this->name, this->len);
this->hash = hfs_strhash(&cname);
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);
}
static void hfs_dentry_iput(struct dentry *dentry, struct inode *inode)
{
struct hfs_cat_entry *entry = HFS_I(inode)->entry;
entry->sys_entry[HFS_ITYPE_TO_INT(HFS_ITYPE(inode->i_ino))] = NULL;
hfs_cat_put(entry);
iput(inode);
}
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