struct dentry *vfsub__lookup_hash(struct qstr *name, struct dentry *parent,
struct nameidata *nd)
{
struct dentry *d;
LKTRTrace("%.*s/%.*s, nd %d\n",
AuDLNPair(parent), AuLNPair(name), !!nd);
if (nd)
LKTRTrace("nd{0x%x}\n", nd->flags);
IMustLock(parent->d_inode);
d = __lookup_hash(name, parent, nd);
if (!IS_ERR(d))
au_update_fuse_h_inode(NULL, d); /*ignore*/
return d;
}
static struct dentry *lkup_hash(const char *name, struct dentry *parent,
int len, struct lkup_args *lkup)
{
struct dentry *dentry;
char *p;
unsigned long hash;
struct qstr this;
unsigned int c;
struct nameidata tmp_nd;
dentry = ERR_PTR(-EACCES);
this.name = name;
this.len = len;
if (unlikely(!len))
goto out;
p = (void*)name;
hash = init_name_hash();
while (len--) {
c = *p++;
if (unlikely(c == '/' || c == '\0'))
goto out;
hash = partial_name_hash(c, hash);
}
this.hash = end_name_hash(hash);
memset(&tmp_nd, 0, sizeof(tmp_nd));
tmp_nd.dentry = dget(parent);
tmp_nd.mnt = mntget(lkup->nfsmnt);
#ifndef CONFIG_AUFS_DLGT
dentry = __lookup_hash(&this, parent, &tmp_nd);
#else
if (!lkup->dlgt)
dentry = __lookup_hash(&this, parent, &tmp_nd);
else {
int wkq_err;
struct lookup_hash_args args = {
.errp = &dentry,
.name = &this,
.base = parent,
.nd = &tmp_nd
};
wkq_err = au_wkq_wait(call_lookup_hash, &args, /*dlgt*/1);
if (unlikely(wkq_err))
dentry = ERR_PTR(wkq_err);
}
#endif
path_release(&tmp_nd);
out:
TraceErrPtr(dentry);
return dentry;
}
#elif defined(CONFIG_AUFS_DLGT)
static struct dentry *lkup_hash(const char *name, struct dentry *parent,
int len, struct lkup_args *lkup)
{
return ERR_PTR(-ENOSYS);
}
#endif
#ifdef CONFIG_AUFS_DLGT
struct lookup_one_len_args {
struct dentry **errp;
const char *name;
struct dentry *parent;
int len;
};
static void call_lookup_one_len(void *args)
{
struct lookup_one_len_args *a = args;
*a->errp = lookup_one_len(a->name, a->parent, a->len);
}
#endif /* CONFIG_AUFS_DLGT */
#if defined(CONFIG_AUFS_LHASH_PATCH) || defined(CONFIG_AUFS_DLGT)
/* cf. lookup_one_len() in linux/fs/namei.c */
struct dentry *lkup_one(const char *name, struct dentry *parent, int len,
struct lkup_args *lkup)
{
struct dentry *dentry;
LKTRTrace("%.*s/%.*s, lkup{%p, %d}\n",
DLNPair(parent), len, name, lkup->nfsmnt, lkup->dlgt);
if (!lkup->nfsmnt) {
#ifndef CONFIG_AUFS_DLGT
dentry = lookup_one_len(name, parent, len);
#else
if (!lkup->dlgt)
dentry = lookup_one_len(name, parent, len);
else {
int wkq_err;
struct lookup_one_len_args args = {
.errp = &dentry,
.name = name,
.parent = parent,
.len = len
};
wkq_err = au_wkq_wait(call_lookup_one_len, &args,
/*dlgt*/1);
if (unlikely(wkq_err))
dentry = ERR_PTR(wkq_err);
}
#endif
} else
static void call_lookup_hash(void *args)
{
struct lookup_hash_args *a = args;
*a->errp = __lookup_hash(a->name, a->base, a->nd);
}
