C++ down_write函数代码示例

int efx_ef10_sriov_set_vf_mac(struct efx_nic *efx, int vf_i, u8 *mac)
{
	struct efx_ef10_nic_data *nic_data = efx->nic_data;
	struct ef10_vf *vf;
	int rc;

	if (nic_data->vf == NULL)
		return -EOPNOTSUPP;

	if (vf_i >= efx->vf_count)
		return -EINVAL;
	vf = nic_data->vf + vf_i;

	if (vf->efx) {
		efx_device_detach_sync(vf->efx);
		efx_net_stop(vf->efx->net_dev);

		down_write(&vf->efx->filter_sem);
		vf->efx->type->filter_table_remove(vf->efx);

		rc = efx_ef10_vadaptor_free(vf->efx, EVB_PORT_ID_ASSIGNED);
		if (rc) {
			up_write(&vf->efx->filter_sem);
			return rc;
		}
	}

	rc = efx_ef10_evb_port_assign(efx, EVB_PORT_ID_NULL, vf_i);
	if (rc)
		return rc;

	if (!is_zero_ether_addr(vf->mac)) {
		rc = efx_ef10_vport_del_vf_mac(efx, vf->vport_id, vf->mac);
		if (rc)
			return rc;
	}

	if (!is_zero_ether_addr(mac)) {
		rc = efx_ef10_vport_add_mac(efx, vf->vport_id, mac);
		if (rc) {
			eth_zero_addr(vf->mac);
			goto fail;
		}
		if (vf->efx)
			ether_addr_copy(vf->efx->net_dev->dev_addr, mac);
	}
	ether_addr_copy(vf->mac, mac);

	rc = efx_ef10_evb_port_assign(efx, vf->vport_id, vf_i);
	if (rc)
		goto fail;

	if (vf->efx) {
		/* VF cannot use the vport_id that the PF created */
		rc = efx_ef10_vadaptor_alloc(vf->efx, EVB_PORT_ID_ASSIGNED);
		if (rc) {
			up_write(&vf->efx->filter_sem);
			return rc;
		}
		vf->efx->type->filter_table_probe(vf->efx);
		up_write(&vf->efx->filter_sem);
		efx_net_open(vf->efx->net_dev);
		netif_device_attach(vf->efx->net_dev);
	}

	return 0;

fail:
	memset(vf->mac, 0, ETH_ALEN);
	return rc;
}

static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
			     struct inode *new_dir, struct dentry *new_dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
	struct page *old_dir_page, *new_dir_page;
	struct page *old_page, *new_page;
	struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry, *new_entry;
	int old_nlink = 0, new_nlink = 0;
	int err = -ENOENT;

	if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
			(old_dir != new_dir) &&
			(!fscrypt_has_permitted_context(new_dir, old_inode) ||
			 !fscrypt_has_permitted_context(old_dir, new_inode)))
		return -EPERM;

	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	if (!old_entry) {
		if (IS_ERR(old_page))
			err = PTR_ERR(old_page);
		goto out;
	}

	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
	if (!new_entry) {
		if (IS_ERR(new_page))
			err = PTR_ERR(new_page);
		goto out_old;
	}

	/* prepare for updating ".." directory entry info later */
	if (old_dir != new_dir) {
		if (S_ISDIR(old_inode->i_mode)) {
			old_dir_entry = f2fs_parent_dir(old_inode,
							&old_dir_page);
			if (!old_dir_entry) {
				if (IS_ERR(old_dir_page))
					err = PTR_ERR(old_dir_page);
				goto out_new;
			}
		}

		if (S_ISDIR(new_inode->i_mode)) {
			new_dir_entry = f2fs_parent_dir(new_inode,
							&new_dir_page);
			if (!new_dir_entry) {
				if (IS_ERR(new_dir_page))
					err = PTR_ERR(new_dir_page);
				goto out_old_dir;
			}
		}
	}

	/*
	 * If cross rename between file and directory those are not
	 * in the same directory, we will inc nlink of file's parent
	 * later, so we should check upper boundary of its nlink.
	 */
	if ((!old_dir_entry || !new_dir_entry) &&
				old_dir_entry != new_dir_entry) {
		old_nlink = old_dir_entry ? -1 : 1;
		new_nlink = -old_nlink;
		err = -EMLINK;
		if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
			(new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
			goto out_new_dir;
	}

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);

	err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
	if (err)
		goto out_unlock;
	if (file_enc_name(new_inode))
		file_set_enc_name(old_inode);

	err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
	if (err)
		goto out_undo;
	if (file_enc_name(old_inode))
		file_set_enc_name(new_inode);

	/* update ".." directory entry info of old dentry */
	if (old_dir_entry)
		f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);

	/* update ".." directory entry info of new dentry */
	if (new_dir_entry)
		f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);

	/* update directory entry info of old dir inode */
	f2fs_set_link(old_dir, old_entry, old_page, new_inode);

	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
//.........这里部分代码省略.........

static int nilfs_remount(struct super_block *sb, int *flags, char *data)
{
	struct the_nilfs *nilfs = sb->s_fs_info;
	unsigned long old_sb_flags;
	unsigned long old_mount_opt;
	int err;

	sync_filesystem(sb);
	old_sb_flags = sb->s_flags;
	old_mount_opt = nilfs->ns_mount_opt;

	if (!parse_options(data, sb, 1)) {
		err = -EINVAL;
		goto restore_opts;
	}
	sb->s_flags = (sb->s_flags & ~SB_POSIXACL);

	err = -EINVAL;

	if (!nilfs_valid_fs(nilfs)) {
		nilfs_msg(sb, KERN_WARNING,
			  "couldn't remount because the filesystem is in an incomplete recovery state");
		goto restore_opts;
	}

	if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
		goto out;
	if (*flags & SB_RDONLY) {
		/* Shutting down log writer */
		nilfs_detach_log_writer(sb);
		sb->s_flags |= SB_RDONLY;

		/*
		 * Remounting a valid RW partition RDONLY, so set
		 * the RDONLY flag and then mark the partition as valid again.
		 */
		down_write(&nilfs->ns_sem);
		nilfs_cleanup_super(sb);
		up_write(&nilfs->ns_sem);
	} else {
		__u64 features;
		struct nilfs_root *root;

		/*
		 * Mounting a RDONLY partition read-write, so reread and
		 * store the current valid flag.  (It may have been changed
		 * by fsck since we originally mounted the partition.)
		 */
		down_read(&nilfs->ns_sem);
		features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
			~NILFS_FEATURE_COMPAT_RO_SUPP;
		up_read(&nilfs->ns_sem);
		if (features) {
			nilfs_msg(sb, KERN_WARNING,
				  "couldn't remount RDWR because of unsupported optional features (%llx)",
				  (unsigned long long)features);
			err = -EROFS;
			goto restore_opts;
		}

		sb->s_flags &= ~SB_RDONLY;

		root = NILFS_I(d_inode(sb->s_root))->i_root;
		err = nilfs_attach_log_writer(sb, root);
		if (err)
			goto restore_opts;

		down_write(&nilfs->ns_sem);
		nilfs_setup_super(sb, true);
		up_write(&nilfs->ns_sem);
	}
 out:
	return 0;

 restore_opts:
	sb->s_flags = old_sb_flags;
	nilfs->ns_mount_opt = old_mount_opt;
	return err;
}

static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
						struct inode *tmp_inode)
{
	int retval;
	__le32	i_data[3];
	struct ext4_inode_info *ei = EXT4_I(inode);
	struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);

	/*
	 * One credit accounted for writing the
	 * i_data field of the original inode
	 */
	retval = ext4_journal_extend(handle, 1);
	if (retval) {
		retval = ext4_journal_restart(handle, 1);
		if (retval)
			goto err_out;
	}

	i_data[0] = ei->i_data[EXT4_IND_BLOCK];
	i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
	i_data[2] = ei->i_data[EXT4_TIND_BLOCK];

	down_write(&EXT4_I(inode)->i_data_sem);
	/*
	 * if EXT4_EXT_MIGRATE is cleared a block allocation
	 * happened after we started the migrate. We need to
	 * fail the migrate
	 */
	if (!(EXT4_I(inode)->i_flags & EXT4_EXT_MIGRATE)) {
		retval = -EAGAIN;
		up_write(&EXT4_I(inode)->i_data_sem);
		goto err_out;
	} else
		EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags &
							~EXT4_EXT_MIGRATE;
	/*
	 * We have the extent map build with the tmp inode.
	 * Now copy the i_data across
	 */
	ei->i_flags |= EXT4_EXTENTS_FL;
	memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));

	/*
	 * Update i_blocks with the new blocks that got
	 * allocated while adding extents for extent index
	 * blocks.
	 *
	 * While converting to extents we need not
	 * update the orignal inode i_blocks for extent blocks
	 * via quota APIs. The quota update happened via tmp_inode already.
	 */
	spin_lock(&inode->i_lock);
	inode->i_blocks += tmp_inode->i_blocks;
	spin_unlock(&inode->i_lock);
	up_write(&EXT4_I(inode)->i_data_sem);

	/*
	 * We mark the inode dirty after, because we decrement the
	 * i_blocks when freeing the indirect meta-data blocks
	 */
	retval = free_ind_block(handle, inode, i_data);
	ext4_mark_inode_dirty(handle, inode);

err_out:
	return retval;
}

int fimg2d_add_command(struct fimg2d_control *info, struct fimg2d_context *ctx,
			struct fimg2d_blit *blit)
{
	int i, ret;
	struct fimg2d_image *buf[MAX_IMAGES] = image_table(blit);
	struct fimg2d_bltcmd *cmd;
	struct fimg2d_image dst;

	if (blit->dst)
		if (copy_from_user(&dst, (void *)blit->dst, sizeof(dst)))
			return -EFAULT;

	if ((blit->dst) && (dst.addr.type == ADDR_USER))
		up_write(&page_alloc_slow_rwsem);
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if ((blit->dst) && (dst.addr.type == ADDR_USER))
		down_write(&page_alloc_slow_rwsem);

	if (!cmd)
		return -ENOMEM;

	for (i = 0; i < MAX_IMAGES; i++) {
		if (!buf[i])
			continue;

		if (copy_from_user(&cmd->image[i], buf[i],
					sizeof(struct fimg2d_image))) {
			ret = -EFAULT;
			goto err_user;
		}
	}

	cmd->ctx = ctx;
	cmd->op = blit->op;
	cmd->sync = blit->sync;
	cmd->seq_no = blit->seq_no;
	memcpy(&cmd->param, &blit->param, sizeof(cmd->param));

#ifdef CONFIG_VIDEO_FIMG2D_DEBUG
	fimg2d_dump_command(cmd);
#endif

	if (fimg2d_check_params(cmd)) {
		printk(KERN_ERR "[%s] invalid params\n", __func__);
		fimg2d_dump_command(cmd);
		ret = -EINVAL;
		goto err_user;
	}

	fimg2d_fixup_params(cmd);

	if (fimg2d_check_dma_sync(cmd)) {
		ret = -EFAULT;
		goto err_user;
	}

	/* add command node and increase ncmd */
	spin_lock(&info->bltlock);
	if (atomic_read(&info->suspended)) {
		fimg2d_debug("fimg2d suspended, do sw fallback\n");
		spin_unlock(&info->bltlock);
		ret = -EFAULT;
		goto err_user;
	}
	atomic_inc(&ctx->ncmd);
	fimg2d_enqueue(&cmd->node, &info->cmd_q);
	fimg2d_debug("ctx %p pgd %p ncmd(%d) seq_no(%u)\n",
			cmd->ctx, (unsigned long *)cmd->ctx->mm->pgd,
			atomic_read(&ctx->ncmd), cmd->seq_no);
	spin_unlock(&info->bltlock);

	return 0;

err_user:
	kfree(cmd);
	return ret;
}

static int nilfs_remount(struct super_block *sb, int *flags, char *data)
{
	struct nilfs_sb_info *sbi = NILFS_SB(sb);
	struct the_nilfs *nilfs = sbi->s_nilfs;
	unsigned long old_sb_flags;
	struct nilfs_mount_options old_opts;
	int was_snapshot, err;

	lock_kernel();

	down_write(&nilfs->ns_super_sem);
	old_sb_flags = sb->s_flags;
	old_opts.mount_opt = sbi->s_mount_opt;
	old_opts.snapshot_cno = sbi->s_snapshot_cno;
	was_snapshot = nilfs_test_opt(sbi, SNAPSHOT);

	if (!parse_options(data, sb, 1)) {
		err = -EINVAL;
		goto restore_opts;
	}
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL);

	err = -EINVAL;
	if (was_snapshot && !(*flags & MS_RDONLY)) {
		printk(KERN_ERR "NILFS (device %s): cannot remount snapshot "
		       "read/write.\n", sb->s_id);
		goto restore_opts;
	}

	if (!nilfs_valid_fs(nilfs)) {
		printk(KERN_WARNING "NILFS (device %s): couldn't "
		       "remount because the filesystem is in an "
		       "incomplete recovery state.\n", sb->s_id);
		goto restore_opts;
	}

	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		goto out;
	if (*flags & MS_RDONLY) {
		/* Shutting down the segment constructor */
		nilfs_detach_segment_constructor(sbi);
		sb->s_flags |= MS_RDONLY;

		/*
		 * Remounting a valid RW partition RDONLY, so set
		 * the RDONLY flag and then mark the partition as valid again.
		 */
		down_write(&nilfs->ns_sem);
		nilfs_cleanup_super(sbi);
		up_write(&nilfs->ns_sem);
	} else {
		__u64 features;

		/*
		 * Mounting a RDONLY partition read-write, so reread and
		 * store the current valid flag.  (It may have been changed
		 * by fsck since we originally mounted the partition.)
		 */
		down_read(&nilfs->ns_sem);
		features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
			~NILFS_FEATURE_COMPAT_RO_SUPP;
		up_read(&nilfs->ns_sem);
		if (features) {
			printk(KERN_WARNING "NILFS (device %s): couldn't "
			       "remount RDWR because of unsupported optional "
			       "features (%llx)\n",
			       sb->s_id, (unsigned long long)features);
			err = -EROFS;
			goto restore_opts;
		}

		sb->s_flags &= ~MS_RDONLY;

		err = nilfs_attach_segment_constructor(sbi);
		if (err)
			goto restore_opts;

		down_write(&nilfs->ns_sem);
		nilfs_setup_super(sbi);
		up_write(&nilfs->ns_sem);
	}
 out:
	up_write(&nilfs->ns_super_sem);
	unlock_kernel();
	return 0;

 restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.mount_opt;
	sbi->s_snapshot_cno = old_opts.snapshot_cno;
	up_write(&nilfs->ns_super_sem);
	unlock_kernel();
	return err;
}

static int lfsck_namespace_exec_dir(const struct lu_env *env,
				    struct lfsck_component *com,
				    struct dt_object *obj,
				    struct lu_dirent *ent)
{
	struct lfsck_thread_info   *info     = lfsck_env_info(env);
	struct lu_attr		   *la	     = &info->lti_la;
	struct lfsck_instance	   *lfsck    = com->lc_lfsck;
	struct lfsck_bookmark	   *bk	     = &lfsck->li_bookmark_ram;
	struct lfsck_namespace	   *ns	     = com->lc_file_ram;
	struct linkea_data	    ldata    = { 0 };
	const struct lu_fid	   *pfid     = lfsck_dto2fid(lfsck->li_obj_dir);
	const struct lu_fid	   *cfid     = lfsck_dto2fid(obj);
	const struct lu_name	   *cname;
	struct thandle		   *handle   = NULL;
	bool			    repaired = false;
	bool			    locked   = false;
	bool			    remove;
	bool			    newdata;
	int			    count    = 0;
	int			    rc;
	ENTRY;

	cname = lfsck_name_get_const(env, ent->lde_name, ent->lde_namelen);
	down_write(&com->lc_sem);
	com->lc_new_checked++;

	if (ent->lde_attrs & LUDA_UPGRADE) {
		ns->ln_flags |= LF_UPGRADE;
		repaired = true;
	} else if (ent->lde_attrs & LUDA_REPAIR) {
		ns->ln_flags |= LF_INCONSISTENT;
		repaired = true;
	}

	if (ent->lde_name[0] == '.' &&
	    (ent->lde_namelen == 1 ||
	     (ent->lde_namelen == 2 && ent->lde_name[1] == '.') ||
	     fid_is_dot_lustre(&ent->lde_fid)))
		GOTO(out, rc = 0);

	if (!(bk->lb_param & LPF_DRYRUN) &&
	    (com->lc_journal || repaired)) {

again:
		LASSERT(!locked);

		com->lc_journal = 1;
		handle = dt_trans_create(env, lfsck->li_next);
		if (IS_ERR(handle))
			GOTO(out, rc = PTR_ERR(handle));

		rc = lfsck_declare_namespace_exec_dir(env, obj, handle);
		if (rc != 0)
			GOTO(stop, rc);

		rc = dt_trans_start(env, lfsck->li_next, handle);
		if (rc != 0)
			GOTO(stop, rc);

		dt_write_lock(env, obj, MOR_TGT_CHILD);
		locked = true;
	}

	rc = lfsck_namespace_check_exist(env, lfsck, obj, ent->lde_name);
	if (rc != 0)
		GOTO(stop, rc);

	rc = lfsck_links_read(env, obj, &ldata);
	if (rc == 0) {
		count = ldata.ld_leh->leh_reccount;
		rc = linkea_links_find(&ldata, cname, pfid);
		if ((rc == 0) &&
		    (count == 1 || !S_ISDIR(lfsck_object_type(obj))))
			goto record;

		ns->ln_flags |= LF_INCONSISTENT;
		/* For dir, if there are more than one linkea entries, or the
		 * linkea entry does not match the name entry, then remove all
		 * and add the correct one. */
		if (S_ISDIR(lfsck_object_type(obj))) {
			remove = true;
			newdata = true;
		} else {
			remove = false;
			newdata = false;
		}
		goto nodata;
	} else if (unlikely(rc == -EINVAL)) {
		count = 1;
		ns->ln_flags |= LF_INCONSISTENT;
		/* The magic crashed, we are not sure whether there are more
		 * corrupt data in the linkea, so remove all linkea entries. */
		remove = true;
		newdata = true;
		goto nodata;
	} else if (rc == -ENODATA) {
		count = 1;
		ns->ln_flags |= LF_UPGRADE;
		remove = false;
//.........这里部分代码省略.........

static int lfsck_namespace_reset(const struct lu_env *env,
				 struct lfsck_component *com, bool init)
{
	struct lfsck_instance	*lfsck = com->lc_lfsck;
	struct lfsck_namespace	*ns    = com->lc_file_ram;
	struct dt_object	*root;
	struct dt_object	*dto;
	int			 rc;
	ENTRY;

	root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
	if (IS_ERR(root))
		RETURN(PTR_ERR(root));

	if (unlikely(!dt_try_as_dir(env, root))) {
		lu_object_put(env, &root->do_lu);
		RETURN(-ENOTDIR);
	}

	down_write(&com->lc_sem);
	if (init) {
		memset(ns, 0, sizeof(*ns));
	} else {
		__u32 count = ns->ln_success_count;
		__u64 last_time = ns->ln_time_last_complete;

		memset(ns, 0, sizeof(*ns));
		ns->ln_success_count = count;
		ns->ln_time_last_complete = last_time;
	}
	ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
	ns->ln_status = LS_INIT;

	rc = local_object_unlink(env, lfsck->li_bottom, root,
				 lfsck_namespace_name);
	if (rc != 0)
		GOTO(out, rc);

	lfsck_object_put(env, com->lc_obj);
	com->lc_obj = NULL;
	dto = local_index_find_or_create(env, lfsck->li_los, root,
					 lfsck_namespace_name,
					 S_IFREG | S_IRUGO | S_IWUSR,
					 &dt_lfsck_features);
	if (IS_ERR(dto))
		GOTO(out, rc = PTR_ERR(dto));

	com->lc_obj = dto;
	rc = dto->do_ops->do_index_try(env, dto, &dt_lfsck_features);
	if (rc != 0)
		GOTO(out, rc);

	rc = lfsck_namespace_store(env, com, true);

	GOTO(out, rc);

out:
	up_write(&com->lc_sem);
	lu_object_put(env, &root->do_lu);
	return rc;
}

static int lfsck_namespace_prep(const struct lu_env *env,
				struct lfsck_component *com,
				struct lfsck_start_param *lsp)
{
	struct lfsck_instance	*lfsck	= com->lc_lfsck;
	struct lfsck_namespace	*ns	= com->lc_file_ram;
	struct lfsck_position	*pos	= &com->lc_pos_start;

	if (ns->ln_status == LS_COMPLETED) {
		int rc;

		rc = lfsck_namespace_reset(env, com, false);
		if (rc != 0)
			return rc;
	}

	down_write(&com->lc_sem);

	ns->ln_time_latest_start = cfs_time_current_sec();

	spin_lock(&lfsck->li_lock);
	if (ns->ln_flags & LF_SCANNED_ONCE) {
		if (!lfsck->li_drop_dryrun ||
		    lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
			ns->ln_status = LS_SCANNING_PHASE2;
			cfs_list_del_init(&com->lc_link);
			cfs_list_add_tail(&com->lc_link,
					  &lfsck->li_list_double_scan);
			if (!cfs_list_empty(&com->lc_link_dir))
				cfs_list_del_init(&com->lc_link_dir);
			lfsck_pos_set_zero(pos);
		} else {
			ns->ln_status = LS_SCANNING_PHASE1;
			ns->ln_run_time_phase1 = 0;
			ns->ln_run_time_phase2 = 0;
			ns->ln_items_checked = 0;
			ns->ln_items_repaired = 0;
			ns->ln_items_failed = 0;
			ns->ln_dirs_checked = 0;
			ns->ln_mlinked_checked = 0;
			ns->ln_objs_checked_phase2 = 0;
			ns->ln_objs_repaired_phase2 = 0;
			ns->ln_objs_failed_phase2 = 0;
			ns->ln_objs_nlink_repaired = 0;
			ns->ln_objs_lost_found = 0;
			fid_zero(&ns->ln_fid_latest_scanned_phase2);
			if (cfs_list_empty(&com->lc_link_dir))
				cfs_list_add_tail(&com->lc_link_dir,
						  &lfsck->li_list_dir);
			*pos = ns->ln_pos_first_inconsistent;
		}
	} else {
		ns->ln_status = LS_SCANNING_PHASE1;
		if (cfs_list_empty(&com->lc_link_dir))
			cfs_list_add_tail(&com->lc_link_dir,
					  &lfsck->li_list_dir);
		if (!lfsck->li_drop_dryrun ||
		    lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
			*pos = ns->ln_pos_last_checkpoint;
			pos->lp_oit_cookie++;
		} else {
			*pos = ns->ln_pos_first_inconsistent;
		}
	}
	spin_unlock(&lfsck->li_lock);

	up_write(&com->lc_sem);
	return 0;
}

static int lfsck_namespace_double_scan_main(void *args)
{
	struct lfsck_thread_args *lta	= args;
	const struct lu_env	*env	= &lta->lta_env;
	struct lfsck_component	*com	= lta->lta_com;
	struct lfsck_instance	*lfsck	= com->lc_lfsck;
	struct ptlrpc_thread	*thread = &lfsck->li_thread;
	struct lfsck_bookmark	*bk	= &lfsck->li_bookmark_ram;
	struct lfsck_namespace	*ns	= com->lc_file_ram;
	struct dt_object	*obj	= com->lc_obj;
	const struct dt_it_ops	*iops	= &obj->do_index_ops->dio_it;
	struct dt_object	*target;
	struct dt_it		*di;
	struct dt_key		*key;
	struct lu_fid		 fid;
	int			 rc;
	__u8			 flags = 0;
	ENTRY;

	com->lc_new_checked = 0;
	com->lc_new_scanned = 0;
	com->lc_time_last_checkpoint = cfs_time_current();
	com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
				cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);

	di = iops->init(env, obj, 0, BYPASS_CAPA);
	if (IS_ERR(di))
		GOTO(out, rc = PTR_ERR(di));

	fid_cpu_to_be(&fid, &ns->ln_fid_latest_scanned_phase2);
	rc = iops->get(env, di, (const struct dt_key *)&fid);
	if (rc < 0)
		GOTO(fini, rc);

	/* Skip the start one, which either has been processed or non-exist. */
	rc = iops->next(env, di);
	if (rc != 0)
		GOTO(put, rc);

	if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
		GOTO(put, rc = 0);

	do {
		if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY3) &&
		    cfs_fail_val > 0) {
			struct l_wait_info lwi;

			lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val),
					  NULL, NULL);
			l_wait_event(thread->t_ctl_waitq,
				     !thread_is_running(thread),
				     &lwi);
		}

		key = iops->key(env, di);
		fid_be_to_cpu(&fid, (const struct lu_fid *)key);
		target = lfsck_object_find(env, lfsck, &fid);
		down_write(&com->lc_sem);
		if (target == NULL) {
			rc = 0;
			goto checkpoint;
		} else if (IS_ERR(target)) {
			rc = PTR_ERR(target);
			goto checkpoint;
		}

		/* XXX: Currently, skip remote object, the consistency for
		 *	remote object will be processed in LFSCK phase III. */
		if (dt_object_exists(target) && !dt_object_remote(target)) {
			rc = iops->rec(env, di, (struct dt_rec *)&flags, 0);
			if (rc == 0)
				rc = lfsck_namespace_double_scan_one(env, com,
								target, flags);
		}

		lfsck_object_put(env, target);

checkpoint:
		com->lc_new_checked++;
		com->lc_new_scanned++;
		ns->ln_fid_latest_scanned_phase2 = fid;
		if (rc > 0)
			ns->ln_objs_repaired_phase2++;
		else if (rc < 0)
			ns->ln_objs_failed_phase2++;
		up_write(&com->lc_sem);

		if ((rc == 0) || ((rc > 0) && !(bk->lb_param & LPF_DRYRUN))) {
			lfsck_namespace_delete(env, com, &fid);
		} else if (rc < 0) {
			flags |= LLF_REPAIR_FAILED;
			lfsck_namespace_update(env, com, &fid, flags, true);
		}

		if (rc < 0 && bk->lb_param & LPF_FAILOUT)
			GOTO(put, rc);

		if (unlikely(cfs_time_beforeq(com->lc_time_next_checkpoint,
					      cfs_time_current())) &&
		    com->lc_new_checked != 0) {
//.........这里部分代码省略.........

int notify_change(struct dentry * dentry, struct iattr * attr)
{
	struct inode *inode = dentry->d_inode;
	mode_t mode = inode->i_mode;
	int error;
	struct timespec now;
	unsigned int ia_valid = attr->ia_valid;

	if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_TIMES_SET)) {
		if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
			return -EPERM;
	}

	now = current_fs_time(inode->i_sb);

	attr->ia_ctime = now;
	if (!(ia_valid & ATTR_ATIME_SET))
		attr->ia_atime = now;
	if (!(ia_valid & ATTR_MTIME_SET))
		attr->ia_mtime = now;
	if (ia_valid & ATTR_KILL_PRIV) {
		attr->ia_valid &= ~ATTR_KILL_PRIV;
		ia_valid &= ~ATTR_KILL_PRIV;
		error = security_inode_need_killpriv(dentry);
		if (error > 0)
			error = security_inode_killpriv(dentry);
		if (error)
			return error;
	}

	/*
	 * We now pass ATTR_KILL_S*ID to the lower level setattr function so
	 * that the function has the ability to reinterpret a mode change
	 * that's due to these bits. This adds an implicit restriction that
	 * no function will ever call notify_change with both ATTR_MODE and
	 * ATTR_KILL_S*ID set.
	 */
	if ((ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) &&
	    (ia_valid & ATTR_MODE))
		BUG();

	if (ia_valid & ATTR_KILL_SUID) {
		if (mode & S_ISUID) {
			ia_valid = attr->ia_valid |= ATTR_MODE;
			attr->ia_mode = (inode->i_mode & ~S_ISUID);
		}
	}
	if (ia_valid & ATTR_KILL_SGID) {
		if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
			if (!(ia_valid & ATTR_MODE)) {
				ia_valid = attr->ia_valid |= ATTR_MODE;
				attr->ia_mode = inode->i_mode;
			}
			attr->ia_mode &= ~S_ISGID;
		}
	}
	if (!(attr->ia_valid & ~(ATTR_KILL_SUID | ATTR_KILL_SGID)))
		return 0;

	error = security_inode_setattr(dentry, attr);
	if (error)
		return error;

	if (ia_valid & ATTR_SIZE)
		down_write(&dentry->d_inode->i_alloc_sem);

	if (inode->i_op->setattr)
		error = inode->i_op->setattr(dentry, attr);
	else
		error = simple_setattr(dentry, attr);

	if (ia_valid & ATTR_SIZE)
		up_write(&dentry->d_inode->i_alloc_sem);

	if (!error)
		fsnotify_change(dentry, ia_valid);

	return error;
}

int efx_ef10_sriov_set_vf_vlan(struct efx_nic *efx, int vf_i, u16 vlan,
			       u8 qos)
{
	struct efx_ef10_nic_data *nic_data = efx->nic_data;
	struct ef10_vf *vf;
	u16 old_vlan, new_vlan;
	int rc = 0, rc2 = 0;

	if (vf_i >= efx->vf_count)
		return -EINVAL;
	if (qos != 0)
		return -EINVAL;

	vf = nic_data->vf + vf_i;

	new_vlan = (vlan == 0) ? EFX_EF10_NO_VLAN : vlan;
	if (new_vlan == vf->vlan)
		return 0;

	if (vf->efx) {
		efx_device_detach_sync(vf->efx);
		efx_net_stop(vf->efx->net_dev);

		down_write(&vf->efx->filter_sem);
		vf->efx->type->filter_table_remove(vf->efx);

		rc = efx_ef10_vadaptor_free(vf->efx, EVB_PORT_ID_ASSIGNED);
		if (rc)
			goto restore_filters;
	}

	if (vf->vport_assigned) {
		rc = efx_ef10_evb_port_assign(efx, EVB_PORT_ID_NULL, vf_i);
		if (rc) {
			netif_warn(efx, drv, efx->net_dev,
				   "Failed to change vlan on VF %d.\n", vf_i);
			netif_warn(efx, drv, efx->net_dev,
				   "This is likely because the VF is bound to a driver in a VM.\n");
			netif_warn(efx, drv, efx->net_dev,
				   "Please unload the driver in the VM.\n");
			goto restore_vadaptor;
		}
		vf->vport_assigned = 0;
	}

	if (!is_zero_ether_addr(vf->mac)) {
		rc = efx_ef10_vport_del_mac(efx, vf->vport_id, vf->mac);
		if (rc)
			goto restore_evb_port;
	}

	if (vf->vport_id) {
		rc = efx_ef10_vport_free(efx, vf->vport_id);
		if (rc)
			goto restore_mac;
		vf->vport_id = 0;
	}

	/* Do the actual vlan change */
	old_vlan = vf->vlan;
	vf->vlan = new_vlan;

	/* Restore everything in reverse order */
	rc = efx_ef10_vport_alloc(efx, EVB_PORT_ID_ASSIGNED,
			MC_CMD_VPORT_ALLOC_IN_VPORT_TYPE_NORMAL,
			vf->vlan, &vf->vport_id);
	if (rc)
		goto reset_nic;

restore_mac:
	if (!is_zero_ether_addr(vf->mac)) {
		rc2 = efx_ef10_vport_add_mac(efx, vf->vport_id, vf->mac);
		if (rc2) {
			eth_zero_addr(vf->mac);
			goto reset_nic;
		}
	}

restore_evb_port:
	rc2 = efx_ef10_evb_port_assign(efx, vf->vport_id, vf_i);
	if (rc2)
		goto reset_nic;
	else
		vf->vport_assigned = 1;

restore_vadaptor:
	if (vf->efx) {
		rc2 = efx_ef10_vadaptor_alloc(vf->efx, EVB_PORT_ID_ASSIGNED);
		if (rc2)
			goto reset_nic;
	}

restore_filters:
	if (vf->efx) {
		rc2 = vf->efx->type->filter_table_probe(vf->efx);
		if (rc2)
			goto reset_nic;

		rc2 = efx_net_open(vf->efx->net_dev);
		if (rc2)
//.........这里部分代码省略.........

/*
 * iterate through the VL servers in a cell until one of them admits knowing
 * about the volume in question
 */
static int afs_vlocation_access_vl_by_id(struct afs_vlocation *vl,
					 struct key *key,
					 afs_volid_t volid,
					 afs_voltype_t voltype,
					 struct afs_cache_vlocation *vldb)
{
	struct afs_cell *cell = vl->cell;
	struct in_addr addr;
	int count, ret;

	_enter("%s,%x,%d,", cell->name, volid, voltype);

	down_write(&vl->cell->vl_sem);
	ret = -ENOMEDIUM;
	for (count = cell->vl_naddrs; count > 0; count--) {
		addr = cell->vl_addrs[cell->vl_curr_svix];

		_debug("CellServ[%hu]: %08x", cell->vl_curr_svix, addr.s_addr);

		/* attempt to access the VL server */
		ret = afs_vl_get_entry_by_id(&addr, key, volid, voltype, vldb,
					     &afs_sync_call);
		switch (ret) {
		case 0:
			goto out;
		case -ENOMEM:
		case -ENONET:
		case -ENETUNREACH:
		case -EHOSTUNREACH:
		case -ECONNREFUSED:
			if (ret == -ENOMEM || ret == -ENONET)
				goto out;
			goto rotate;
		case -EBUSY:
			vl->upd_busy_cnt++;
			if (vl->upd_busy_cnt <= 3) {
				if (vl->upd_busy_cnt > 1) {
					/* second+ BUSY - sleep a little bit */
					set_current_state(TASK_UNINTERRUPTIBLE);
					schedule_timeout(1);
					__set_current_state(TASK_RUNNING);
				}
				continue;
			}
			break;
		case -ENOMEDIUM:
			vl->upd_rej_cnt++;
			goto rotate;
		default:
			ret = -EIO;
			goto rotate;
		}

		/* rotate the server records upon lookup failure */
	rotate:
		cell->vl_curr_svix++;
		cell->vl_curr_svix %= cell->vl_naddrs;
		vl->upd_busy_cnt = 0;
	}

out:
	if (ret < 0 && vl->upd_rej_cnt > 0) {
//		printk(KERN_NOTICE "kAFS:"
//		       " Active volume no longer valid '%s'\n",
;
		vl->valid = 0;
		ret = -ENOMEDIUM;
	}

	up_write(&vl->cell->vl_sem);
	_leave(" = %d", ret);
	return ret;
}

/**
 * nilfs_fill_super() - initialize a super block instance
 * @sb: super_block
 * @data: mount options
 * @silent: silent mode flag
 *
 * This function is called exclusively by nilfs->ns_mount_mutex.
 * So, the recovery process is protected from other simultaneous mounts.
 */
static int
nilfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct the_nilfs *nilfs;
	struct nilfs_root *fsroot;
	struct backing_dev_info *bdi;
	__u64 cno;
	int err;

	nilfs = alloc_nilfs(sb->s_bdev);
	if (!nilfs)
		return -ENOMEM;

	sb->s_fs_info = nilfs;

	err = init_nilfs(nilfs, sb, (char *)data);
	if (err)
		goto failed_nilfs;

	sb->s_op = &nilfs_sops;
	sb->s_export_op = &nilfs_export_ops;
	sb->s_root = NULL;
	sb->s_time_gran = 1;
	sb->s_max_links = NILFS_LINK_MAX;

	bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
	sb->s_bdi = bdi ? : &default_backing_dev_info;

	err = load_nilfs(nilfs, sb);
	if (err)
		goto failed_nilfs;

	cno = nilfs_last_cno(nilfs);
	err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
	if (err) {
		printk(KERN_ERR "NILFS: error loading last checkpoint "
		       "(checkpoint number=%llu).\n", (unsigned long long)cno);
		goto failed_unload;
	}

	if (!(sb->s_flags & MS_RDONLY)) {
		err = nilfs_attach_log_writer(sb, fsroot);
		if (err)
			goto failed_checkpoint;
	}

	err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
	if (err)
		goto failed_segctor;

	nilfs_put_root(fsroot);

	if (!(sb->s_flags & MS_RDONLY)) {
		down_write(&nilfs->ns_sem);
		nilfs_setup_super(sb, true);
		up_write(&nilfs->ns_sem);
	}

	return 0;

 failed_segctor:
	nilfs_detach_log_writer(sb);

 failed_checkpoint:
	nilfs_put_root(fsroot);

 failed_unload:
	iput(nilfs->ns_sufile);
	iput(nilfs->ns_cpfile);
	iput(nilfs->ns_dat);

 failed_nilfs:
	destroy_nilfs(nilfs);
	return err;
}

//.........这里部分代码省略.........
	if (S_ISDIR(old_inode->i_mode)) {
		err = -EIO;
		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
		if (!old_dir_entry)
			goto out_old;
	}

	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
			goto out_dir;

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry)
			goto out_dir;

		f2fs_lock_op(sbi);

		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

		if (update_dent_inode(old_inode, &new_dentry->d_name)) {
			release_orphan_inode(sbi);
			goto put_out_dir;
		}

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
		down_write(&F2FS_I(new_inode)->i_sem);
		if (old_dir_entry)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
		up_write(&F2FS_I(new_inode)->i_sem);

		mark_inode_dirty(new_inode);

		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
		else
			release_orphan_inode(sbi);

		update_inode_page(old_inode);
		update_inode_page(new_inode);
	} else {
		f2fs_lock_op(sbi);

		err = f2fs_add_link(new_dentry, old_inode);
		if (err) {
			f2fs_unlock_op(sbi);
			goto out_dir;
		}

		if (old_dir_entry) {
			inc_nlink(new_dir);
			update_inode_page(new_dir);
		}
	}

	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
	up_write(&F2FS_I(old_inode)->i_sem);