C++ ERR_CAST函数代码示例

static struct regmap *meson_map_resource(struct meson_pinctrl *pc,
					 struct device_node *node, char *name)
{
	struct resource res;
	void __iomem *base;
	int i;

	i = of_property_match_string(node, "reg-names", name);
	if (of_address_to_resource(node, i, &res))
		return ERR_PTR(-ENOENT);

	base = devm_ioremap_resource(pc->dev, &res);
	if (IS_ERR(base))
		return ERR_CAST(base);

	meson_regmap_config.max_register = resource_size(&res) - 4;
	meson_regmap_config.name = devm_kasprintf(pc->dev, GFP_KERNEL,
						  "%s-%s", node->name,
						  name);
	if (!meson_regmap_config.name)
		return ERR_PTR(-ENOMEM);

	return devm_regmap_init_mmio(pc->dev, base, &meson_regmap_config);
}

static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
		u64 ino, u32 generation)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;

	if (check_nid_range(sbi, ino))
		return ERR_PTR(-ESTALE);

	/*
	 * f2fs_iget isn't quite right if the inode is currently unallocated!
	 * However f2fs_iget currently does appropriate checks to handle stale
	 * inodes so everything is OK.
	 */
	inode = f2fs_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (unlikely(generation && inode->i_generation != generation)) {
		/* we didn't find the right inode.. */
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
	return inode;
}

static struct drm_gem_object *vgem_prime_import_sg_table(struct drm_device *dev,
			struct dma_buf_attachment *attach, struct sg_table *sg)
{
	struct drm_vgem_gem_object *obj;
	int npages;

	obj = __vgem_gem_create(dev, attach->dmabuf->size);
	if (IS_ERR(obj))
		return ERR_CAST(obj);

	npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE;

	obj->table = sg;
	obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
	if (!obj->pages) {
		__vgem_gem_destroy(obj);
		return ERR_PTR(-ENOMEM);
	}

	obj->pages_pin_count++; /* perma-pinned */
	drm_prime_sg_to_page_addr_arrays(obj->table, obj->pages, NULL,
					npages);
	return &obj->base;
}

static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
		const char *path, u32 *pacllen)
{
	struct cifs_ntsd *pntsd = NULL;
	int oplock = 0;
	unsigned int xid;
	int rc, create_options = 0;
	__u16 fid;
	struct cifs_tcon *tcon;
	struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);

	if (IS_ERR(tlink))
		return ERR_CAST(tlink);

	tcon = tlink_tcon(tlink);
	xid = get_xid();

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, READ_CONTROL,
			create_options, &fid, &oplock, NULL, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (!rc) {
		rc = CIFSSMBGetCIFSACL(xid, tcon, fid, &pntsd, pacllen);
		CIFSSMBClose(xid, tcon, fid);
	}

	cifs_put_tlink(tlink);
	free_xid(xid);

	cFYI(1, "%s: rc = %d ACL len %d", __func__, rc, *pacllen);
	if (rc)
		return ERR_PTR(rc);
	return pntsd;
}

static struct dentry *
isofs_export_iget(struct super_block *sb,
          unsigned long block,
          unsigned long offset,
          __u32 generation)
{
    struct inode *inode;
    struct dentry *result;
    if (block == 0)
        return ERR_PTR(-ESTALE);
    inode = isofs_iget(sb, block, offset);
    if (IS_ERR(inode))
        return ERR_CAST(inode);
    if (generation && inode->i_generation != generation) {
        iput(inode);
        return ERR_PTR(-ESTALE);
    }
    result = d_alloc_anon(inode);
    if (!result) {
        iput(inode);
        return ERR_PTR(-ENOMEM);
    }
    return result;
}

static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
					    int tos, int oif,
					    const xfrm_address_t *saddr,
					    const xfrm_address_t *daddr,
					    u32 mark)
{
	struct rtable *rt;

	memset(fl4, 0, sizeof(*fl4));
	fl4->daddr = daddr->a4;
	fl4->flowi4_tos = tos;
	fl4->flowi4_oif = l3mdev_master_ifindex_by_index(net, oif);
	fl4->flowi4_mark = mark;
	if (saddr)
		fl4->saddr = saddr->a4;

	fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;

	rt = __ip_route_output_key(net, fl4);
	if (!IS_ERR(rt))
		return &rt->dst;

	return ERR_CAST(rt);
}

static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb,
						 u32 type, u32 mask)
{
	struct crypto_instance *inst;
	struct crypto_alg *alg;

	alg = crypto_get_attr_alg(tb, type, (mask & CRYPTO_ALG_TYPE_MASK));
	if (IS_ERR(alg))
		return ERR_CAST(alg);

	inst = pcrypt_alloc_instance(alg);
	if (IS_ERR(inst))
		goto out_put_alg;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
	inst->alg.cra_type = &crypto_aead_type;

	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
	inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;

	inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);

	inst->alg.cra_init = pcrypt_aead_init_tfm;
	inst->alg.cra_exit = pcrypt_aead_exit_tfm;

	inst->alg.cra_aead.setkey = pcrypt_aead_setkey;
	inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize;
	inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt;
	inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt;
	inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt;

out_put_alg:
	crypto_mod_put(alg);
	return inst;
}

/* Returns a dentry corresponding to a specific extended attribute file
 * for the inode. If flags allow, the file is created. Otherwise, a
 * valid or negative dentry, or an error is returned. */
static struct dentry *xattr_lookup(struct inode *inode, const char *name,
				    int flags)
{
	struct dentry *xadir, *xafile;
	int err = 0;

	xadir = open_xa_dir(inode, flags);
	if (IS_ERR(xadir))
		return ERR_CAST(xadir);

	mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
	xafile = lookup_one_len(name, xadir, strlen(name));
	if (IS_ERR(xafile)) {
		err = PTR_ERR(xafile);
		goto out;
	}

	if (xafile->d_inode && (flags & XATTR_CREATE))
		err = -EEXIST;

	if (!xafile->d_inode) {
		err = -ENODATA;
		if (xattr_may_create(flags))
			err = xattr_create(xadir->d_inode, xafile,
					      0700|S_IFREG);
	}

	if (err)
		dput(xafile);
out:
	mutex_unlock(&xadir->d_inode->i_mutex);
	dput(xadir);
	if (err)
		return ERR_PTR(err);
	return xafile;
}

static void
add_weight_vector(grn_ctx *ctx,
                  grn_obj *column,
                  grn_obj *value,
                  grn_obj *vector)
{
  unsigned int i, n;
  grn_obj weight_buffer;

  n = GRN_UINT32_VALUE(value);
  GRN_UINT32_INIT(&weight_buffer, 0);
  for (i = 0; i < n; i += 2) {
    grn_rc rc;
    grn_obj *key, *weight;

    key = value + 1 + i;
    weight = key + 1;

    GRN_BULK_REWIND(&weight_buffer);
    rc = grn_obj_cast(ctx, weight, &weight_buffer, GRN_TRUE);
    if (rc != GRN_SUCCESS) {
      grn_obj *range;
      range = grn_ctx_at(ctx, weight_buffer.header.domain);
      ERR_CAST(column, range, weight);
      grn_obj_unlink(ctx, range);
      break;
    }
    grn_vector_add_element(ctx,
                           vector,
                           GRN_BULK_HEAD(key),
                           GRN_BULK_VSIZE(key),
                           GRN_UINT32_VALUE(&weight_buffer),
                           key->header.domain);
  }
  GRN_OBJ_FIN(ctx, &weight_buffer);
}

static struct dentry *
cifs_do_mount(struct file_system_type *fs_type,
	    int flags, const char *dev_name, void *data)
{
	int rc;
	struct super_block *sb;

	sb = sget(fs_type, NULL, set_anon_super, NULL);

	cFYI(1, "Devname: %s flags: %d ", dev_name, flags);

	if (IS_ERR(sb))
		return ERR_CAST(sb);

	sb->s_flags = flags;

	rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
	if (rc) {
		deactivate_locked_super(sb);
		return ERR_PTR(rc);
	}
	sb->s_flags |= MS_ACTIVE;
	return dget(sb->s_root);
}

static struct da8xx_usb0_clk48 *
da8xx_cfgchip_register_usb0_clk48(struct device *dev,
				  struct regmap *regmap)
{
	const char * const parent_names[] = { "usb_refclkin", "pll0_auxclk" };
	struct clk *fck_clk;
	struct da8xx_usb0_clk48 *usb0;
	struct clk_init_data init;
	int ret;

	fck_clk = devm_clk_get(dev, "fck");
	if (IS_ERR(fck_clk)) {
		if (PTR_ERR(fck_clk) != -EPROBE_DEFER)
			dev_err(dev, "Missing fck clock\n");
		return ERR_CAST(fck_clk);
	}

	usb0 = devm_kzalloc(dev, sizeof(*usb0), GFP_KERNEL);
	if (!usb0)
		return ERR_PTR(-ENOMEM);

	init.name = "usb0_clk48";
	init.ops = &da8xx_usb0_clk48_ops;
	init.parent_names = parent_names;
	init.num_parents = 2;

	usb0->hw.init = &init;
	usb0->fck = fck_clk;
	usb0->regmap = regmap;

	ret = devm_clk_hw_register(dev, &usb0->hw);
	if (ret < 0)
		return ERR_PTR(ret);

	return usb0;
}

//.........这里部分代码省略.........
	struct gfs2_inode *dip = GFS2_I(dir), *ip;
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
	struct gfs2_glock *io_gl;
	struct dentry *d;
	int error;
	u32 aflags = 0;
	struct gfs2_diradd da = { .bh = NULL, };

	if (!name->len || name->len > GFS2_FNAMESIZE)
		return -ENAMETOOLONG;

	error = gfs2_rs_alloc(dip);
	if (error)
		return error;

	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
	if (error)
		goto fail;

	error = create_ok(dip, name, mode);
	if (error)
		goto fail_gunlock;

	inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
	error = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
		d = d_splice_alias(inode, dentry);
		error = PTR_ERR(d);
		if (IS_ERR(d)) {
			inode = ERR_CAST(d);
			goto fail_gunlock;
		}
		error = 0;
		if (file) {
			if (S_ISREG(inode->i_mode)) {
				WARN_ON(d != NULL);
				error = finish_open(file, dentry, gfs2_open_common, opened);
			} else {
				error = finish_no_open(file, d);
			}
		} else {
			dput(d);
		}
		gfs2_glock_dq_uninit(ghs);
		return error;
	} else if (error != -ENOENT) {
		goto fail_gunlock;
	}

	error = gfs2_diradd_alloc_required(dir, name, &da);
	if (error < 0)
		goto fail_gunlock;

	inode = new_inode(sdp->sd_vfs);
	error = -ENOMEM;
	if (!inode)
		goto fail_gunlock;

	error = posix_acl_create(dir, &mode, &default_acl, &acl);
	if (error)
		goto fail_free_vfs_inode;

static struct crypto_instance *crypto_rfc3686_alloc(struct rtattr **tb)
{
	struct crypto_attr_type *algt;
	struct crypto_instance *inst;
	struct crypto_alg *alg;
	struct crypto_skcipher_spawn *spawn;
	const char *cipher_name;
	int err;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return ERR_CAST(algt);

	if ((algt->type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & algt->mask)
		return ERR_PTR(-EINVAL);

	cipher_name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(cipher_name))
		return ERR_CAST(cipher_name);

	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
	if (!inst)
		return ERR_PTR(-ENOMEM);

	spawn = crypto_instance_ctx(inst);

	crypto_set_skcipher_spawn(spawn, inst);
	err = crypto_grab_skcipher(spawn, cipher_name, 0,
				   crypto_requires_sync(algt->type,
							algt->mask));
	if (err)
		goto err_free_inst;

	alg = crypto_skcipher_spawn_alg(spawn);

	/* We only support 16-byte blocks. */
	err = -EINVAL;
	if (alg->cra_ablkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE)
		goto err_drop_spawn;

	/* Not a stream cipher? */
	if (alg->cra_blocksize != 1)
		goto err_drop_spawn;

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "rfc3686(%s)",
		     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
		goto err_drop_spawn;
	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "rfc3686(%s)", alg->cra_driver_name) >=
			CRYPTO_MAX_ALG_NAME)
		goto err_drop_spawn;

	inst->alg.cra_priority = alg->cra_priority;
	inst->alg.cra_blocksize = 1;
	inst->alg.cra_alignmask = alg->cra_alignmask;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
			      (alg->cra_flags & CRYPTO_ALG_ASYNC);
	inst->alg.cra_type = &crypto_ablkcipher_type;

	inst->alg.cra_ablkcipher.ivsize = CTR_RFC3686_IV_SIZE;
	inst->alg.cra_ablkcipher.min_keysize =
		alg->cra_ablkcipher.min_keysize + CTR_RFC3686_NONCE_SIZE;
	inst->alg.cra_ablkcipher.max_keysize =
		alg->cra_ablkcipher.max_keysize + CTR_RFC3686_NONCE_SIZE;

	inst->alg.cra_ablkcipher.geniv = "seqiv";

	inst->alg.cra_ablkcipher.setkey = crypto_rfc3686_setkey;
	inst->alg.cra_ablkcipher.encrypt = crypto_rfc3686_crypt;
	inst->alg.cra_ablkcipher.decrypt = crypto_rfc3686_crypt;

	inst->alg.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx);

	inst->alg.cra_init = crypto_rfc3686_init_tfm;
	inst->alg.cra_exit = crypto_rfc3686_exit_tfm;

	return inst;

err_drop_spawn:
	crypto_drop_skcipher(spawn);
err_free_inst:
	kfree(inst);
	return ERR_PTR(err);
}

struct dentry *f2fs_get_parent(struct dentry *child)
{
    struct qstr dotdot = {.len = 2, .name = ".."};
    unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
    if (!ino)
        return ERR_PTR(-ENOENT);
    return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
}

static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
                                  struct nameidata *nd)
{
    struct inode *inode = NULL;
    struct f2fs_dir_entry *de;
    struct page *page;

    if (dentry->d_name.len > F2FS_NAME_LEN)
        return ERR_PTR(-ENAMETOOLONG);

    de = f2fs_find_entry(dir, &dentry->d_name, &page);
    if (de) {
        nid_t ino = le32_to_cpu(de->ino);
        kunmap(page);
        f2fs_put_page(page, 0);

        inode = f2fs_iget(dir->i_sb, ino);
        if (IS_ERR(inode))
            return ERR_CAST(inode);

        stat_inc_inline_inode(inode);
    }

    return d_splice_alias(inode, dentry);
}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
    struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
    struct inode *inode = dentry->d_inode;
    struct f2fs_dir_entry *de;
    struct page *page;
    int err = -ENOENT;

    trace_f2fs_unlink_enter(dir, dentry);
    f2fs_balance_fs(sbi);

    de = f2fs_find_entry(dir, &dentry->d_name, &page);
    if (!de)
        goto fail;

    f2fs_lock_op(sbi);
    err = acquire_orphan_inode(sbi);
    if (err) {
        f2fs_unlock_op(sbi);
        kunmap(page);
        f2fs_put_page(page, 0);
        goto fail;
    }
    f2fs_delete_entry(de, page, inode);
    f2fs_unlock_op(sbi);

    /* In order to evict this inode, we set it dirty */
    mark_inode_dirty(inode);
fail:
    trace_f2fs_unlink_exit(inode, err);
    return err;
}

static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
                        const char *symname)
{
    struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
    struct inode *inode;
    size_t symlen = strlen(symname) + 1;
    int err;

    f2fs_balance_fs(sbi);

    inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
    if (IS_ERR(inode))
        return PTR_ERR(inode);

    inode->i_op = &f2fs_symlink_inode_operations;
    inode->i_mapping->a_ops = &f2fs_dblock_aops;

    f2fs_lock_op(sbi);
    err = f2fs_add_link(dentry, inode);
    f2fs_unlock_op(sbi);
    if (err)
        goto out;

    err = page_symlink(inode, symname, symlen);
    alloc_nid_done(sbi, inode->i_ino);

    d_instantiate(dentry, inode);
    unlock_new_inode(inode);
    return err;
out:
    clear_nlink(inode);
    iget_failed(inode);
//.........这里部分代码省略.........

static int recover_dentry(struct inode *inode, struct page *ipage,
						struct list_head *dir_list)
{
	struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
	nid_t pino = le32_to_cpu(raw_inode->i_pino);
	struct f2fs_dir_entry *de;
	struct fscrypt_name fname;
	struct page *page;
	struct inode *dir, *einode;
	struct fsync_inode_entry *entry;
	int err = 0;
	char *name;

	entry = get_fsync_inode(dir_list, pino);
	if (!entry) {
		entry = add_fsync_inode(F2FS_I_SB(inode), dir_list,
							pino, false);
		if (IS_ERR(entry)) {
			dir = ERR_CAST(entry);
			err = PTR_ERR(entry);
			goto out;
		}
	}

	dir = entry->inode;

	memset(&fname, 0, sizeof(struct fscrypt_name));
	fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen);
	fname.disk_name.name = raw_inode->i_name;

	if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) {
		WARN_ON(1);
		err = -ENAMETOOLONG;
		goto out;
	}
retry:
	de = __f2fs_find_entry(dir, &fname, &page);
	if (de && inode->i_ino == le32_to_cpu(de->ino))
		goto out_put;

	if (de) {
		einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino));
		if (IS_ERR(einode)) {
			WARN_ON(1);
			err = PTR_ERR(einode);
			if (err == -ENOENT)
				err = -EEXIST;
			goto out_put;
		}

		err = dquot_initialize(einode);
		if (err) {
			iput(einode);
			goto out_put;
		}

		err = f2fs_acquire_orphan_inode(F2FS_I_SB(inode));
		if (err) {
			iput(einode);
			goto out_put;
		}
		f2fs_delete_entry(de, page, dir, einode);
		iput(einode);
		goto retry;
	} else if (IS_ERR(page)) {
		err = PTR_ERR(page);
	} else {
		err = f2fs_add_dentry(dir, &fname, inode,
					inode->i_ino, inode->i_mode);
	}
	if (err == -ENOMEM)
		goto retry;
	goto out;

out_put:
	f2fs_put_page(page, 0);
out:
	if (file_enc_name(inode))
		name = "<encrypted>";
	else
		name = raw_inode->i_name;
	f2fs_msg(inode->i_sb, KERN_NOTICE,
			"%s: ino = %x, name = %s, dir = %lx, err = %d",
			__func__, ino_of_node(ipage), name,
			IS_ERR(dir) ? 0 : dir->i_ino, err);
	return err;
}