root/fs/hpfs/dentry.c

DEFINITIONS

1. hpfs_hash_dentry
2. hpfs_compare_dentry
3. hpfs_set_dentry_operations

/*
 *  linux/fs/hpfs/dentry.c
 *
 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
 *
 *  dcache operations
 */

#include "hpfs_fn.h"

/*
 * Note: the dentry argument is the parent dentry.
 */

static int hpfs_hash_dentry(struct dentry *dentry, struct qstr *qstr)
{
        unsigned long    hash;
        int              i;
        unsigned l = qstr->len;

        if (l == 1) if (qstr->name[0]=='.') goto x;
        if (l == 2) if (qstr->name[0]=='.' || qstr->name[1]=='.') goto x;
        hpfs_adjust_length((char *)qstr->name, &l);
        /*if (hpfs_chk_name((char *)qstr->name,&l))*/
                /*return -ENAMETOOLONG;*/
                /*return -ENOENT;*/
        x:

        hash = init_name_hash();
        for (i = 0; i < l; i++)
                hash = partial_name_hash(hpfs_upcase(hpfs_sb(dentry->d_sb)->sb_cp_table,qstr->name[i]), hash);
        qstr->hash = end_name_hash(hash);

        return 0;
}

static int hpfs_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
{
        unsigned al=a->len;
        unsigned bl=b->len;
        hpfs_adjust_length((char *)a->name, &al);
        /*hpfs_adjust_length((char *)b->name, &bl);*/
        /* 'a' is the qstr of an already existing dentry, so the name
         * must be valid. 'b' must be validated first.
         */

        if (hpfs_chk_name((char *)b->name, &bl)) return 1;
        if (hpfs_compare_names(dentry->d_sb, (char *)a->name, al, (char *)b->name, bl, 0)) return 1;
        return 0;
}

static struct dentry_operations hpfs_dentry_operations = {
        .d_hash         = hpfs_hash_dentry,
        .d_compare      = hpfs_compare_dentry,
};

void hpfs_set_dentry_operations(struct dentry *dentry)
{
        dentry->d_op = &hpfs_dentry_operations;
}