static /* noinline_for_stack */
struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino,
ino_t dir_ino, struct au_nfsd_si_lock *nsi_lock)
{
struct dentry *dentry, *parent;
struct path path;
LKTRTrace("i%lu, diri%lu\n",
(unsigned long)ino, (unsigned long)dir_ino);
parent = sb->s_root;
if (dir_ino != AUFS_ROOT_INO) {
parent = decode_by_ino(sb, dir_ino, 0);
dentry = parent;
if (!parent)
goto out;
if (IS_ERR(parent))
goto out;
AuDebugOn(au_test_anon(parent));
} else
dget(parent);
path.dentry = parent;
path.mnt = au_sbi(sb)->si_mnt;
dentry = au_lkup_by_ino(&path, ino, nsi_lock);
dput(parent);
out:
AuTraceErrPtr(dentry);
return dentry;
}
static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino,
ino_t dir_ino,
struct au_nfsd_si_lock *nsi_lock)
{
struct dentry *dentry;
struct path path;
if (dir_ino != AUFS_ROOT_INO) {
path.dentry = decode_by_ino(sb, dir_ino, 0);
dentry = path.dentry;
if (!path.dentry || IS_ERR(path.dentry))
goto out;
AuDebugOn(au_test_anon(path.dentry));
} else
path.dentry = dget(sb->s_root);
path.mnt = au_mnt_get(sb);
dentry = au_lkup_by_ino(&path, ino, nsi_lock);
path_put(&path);
out:
AuTraceErrPtr(dentry);
return dentry;
}
static
struct dentry *decode_by_path(struct super_block *sb, aufs_bindex_t bindex,
ino_t ino, __u32 *fh, int fh_len,
struct au_nfsd_si_lock *nsi_lock)
{
struct dentry *dentry, *h_parent, *root;
struct super_block *h_sb;
char *pathname, *p;
struct vfsmount *h_mnt;
struct au_branch *br;
int err;
struct path path;
br = au_sbr(sb, bindex);
/* au_br_get(br); */
h_mnt = br->br_mnt;
h_sb = h_mnt->mnt_sb;
/* todo: call lower fh_to_dentry()? fh_to_parent()? */
h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail),
fh_len - Fh_tail, fh[Fh_h_type],
h_acceptable, /*context*/NULL);
dentry = h_parent;
if (unlikely(!h_parent || IS_ERR(h_parent))) {
AuWarn1("%s decode_fh failed, %ld\n",
au_sbtype(h_sb), PTR_ERR(h_parent));
goto out;
}
dentry = NULL;
if (unlikely(au_test_anon(h_parent))) {
AuWarn1("%s decode_fh returned a disconnected dentry\n",
au_sbtype(h_sb));
goto out_h_parent;
}
dentry = ERR_PTR(-ENOMEM);
pathname = (void *)__get_free_page(GFP_NOFS);
if (unlikely(!pathname))
goto out_h_parent;
root = sb->s_root;
path.mnt = h_mnt;
di_read_lock_parent(root, !AuLock_IR);
path.dentry = au_h_dptr(root, bindex);
di_read_unlock(root, !AuLock_IR);
p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb);
dentry = (void *)p;
if (IS_ERR(p))
goto out_pathname;
si_read_unlock(sb);
err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
dentry = ERR_PTR(err);
if (unlikely(err))
goto out_relock;
dentry = ERR_PTR(-ENOENT);
AuDebugOn(au_test_anon(path.dentry));
if (unlikely(!path.dentry->d_inode))
goto out_path;
if (ino != path.dentry->d_inode->i_ino)
dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL);
else
dentry = dget(path.dentry);
out_path:
path_put(&path);
out_relock:
if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0))
if (!IS_ERR(dentry)) {
dput(dentry);
dentry = ERR_PTR(-ESTALE);
}
out_pathname:
free_page((unsigned long)pathname);
out_h_parent:
dput(h_parent);
out:
/* au_br_put(br); */
AuTraceErrPtr(dentry);
return dentry;
}
